| Title of Invention | DIGITAL BROADCASTING RECEIVER AND METHOD FOR CONTROLLING THE SAME |
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| Abstract | A digital broadcast receiver and a control method thereof are disclosed. The control method includes receiving a broadcast signal into which mobile service data and main service data arc multiplexed, extracting TPC signaling information and FIC signaling information from a data group in the received mobile service data, acquiring a program table describing virtual channel information and a service of an ensemble, using the extracted FIC signaling information, the ensemble being a virtual channel group of the received mobile service data, detecting a conditional access descriptor indicating whether the mobile service data was encrypted, using the acquired program table, and controlling such that the encrypted mobile service data is decrypted, using information of the detected conditional access descriptor. |
| Full Text | Description CONTROLLING THE SAME Technical Field (1 ] The present invention relates to a digital broadcasting system, and more particularly, to a digital broadcast receiving system and a method for controlling the same. Backjfroiind Art [2] A digital broadcasting system is configured of a digital broadcast transmitting system (or transmitter) and a digital broadcast receiving system (or receiver). Also, the digital broadcast transmitting system digitally prcxjesses data, such as broadcast programs, and transmits the proccs.scd data to the digital broadcast receiving systein. Due to its various advantages, such as efficient data transmission, the digital broadcasting system is gradually replacing the conventional analog broadca.sting systems. [3] However, the Vestigial Sideband (VSB) transmission mode, which is adopted as the standard for digital broadcasting in North America and the Republic of Korea, is a system using a single carrier method. Therefore, the receiving performance of the digital broadcast receiving system may be deteriorated in a poor channel environment. Particularly, since resistance to changes in channels and noise is more highly required when using portable and/or mobile broadcast receivers, the receiving performance may be even more deteiiorated when transmitting mobile service data by the VSB transmission mode. f4) Moreover, in a conventional mobile digital broadcasting environment, it is the cunent reality that there is no concrete technology for setting or releasing a conditional access to a specific service. Disclosure of Invention Technical Problem [5J Accordingly, the present invention is directed to a digital broadcast receiver and a control method thereof that substantially obviates one or more problems due to limitations and disadvantages of the related ail. [6] An object of the present invention is to provide a digital broadcast receiver which is robust against a channel variation and noise, and a control method thereof. |7| Another object of the present invention is to provide a data processing method which is capable of setting or releasing a conditional access to a specific service in a mobile digital broadcasting environment. [8] Additional advantages, objects, and features of the invention will be set forth in part in the de.scription which follows and in part will become apparent to those having oidinury skill in the ait Lipt)n examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. Technical Solution |9| To achieve these objects and other advantages and in accordance with the purpose of the invention, as einbodied and broadly described herein, a control method of a digital broadcast receiver includes t!ie steps of receiving a broadcast signal into which mobile .service Uuia ariu main scr\'icc uuiU arc muitipicxcu, cxlructing tran.srTiiSSion paramCiCr channel (TPC) signaling infonnation and fast infomiaiion channel (FlC) signaling in- formation from a data group in the received mobile service data, acquiring a program table describing virtual channel information and a service of an ensemble by using the extracted FlC signaling information, the ensemble being a virtual channel group of the received mobile sei"vice data, detecting a conditional access descriptor indicating whether the mobile seiTice data was encrypted by using the acquired program table, and controlling such that the encrypted mobile service data is decrypted by using in- formation of the detected conditional access descriptor. [ lOJ In another aspect of the present invention, a digital broadcast receiver includes a reception unit, an extractor, an acquirer, a detector, and a controller. The reception unit receives a broadcast signal into which mobile service data and main service data are multiplexed. The extractor extracts transmission parameter channel signaUng in- formation and fast information channel signaling information from a data group in the received mobile service data. The acquirer acquires a program table describing virtual channel information and a service of an ensemble by using the extracted fast in- formation channel signaling information, the ensemble being a virtual channel group of the received mobile service data. The detector detects a conditional access descriptor indicating whether the mobile service data was encrypted by using the acquired program table. And the controller controls such that the encrypted mobile service data is decrypted by using information of the detected conditional access descriptor. (11] In a further aspect of the present invention, a control method of a digital broadcast transmitter includes the steps of generating a broadcast signal including a conditional access descriptor indicating whether mobile service data was encrypted, and transmitting the generated broadcast signal including the conditional access descriptor to a digital broadcast receiver side, wherein the conditional access descriptor includes infoixnation identifying respective levels at which the mobile service data was encryp ted, and infonnation about control data which is used for decryption of the encrypted mobile service data. [ 12] It is to be understood that both the foiegoinu: geiieial deseription and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Advantageous Effects [13] According to one embodiment of the present invention, it is possible to provide a digital broadcast receiver which is robust against a channel variation and noise, and a control method thereof. [14! Further, acct)rding to another embodimenl of the present invention, it is possible to readily implement a function of selling or releasing a conditional access to a specific service in a mobile digital broadcasting environment. [ 15J Moreover, according to a further embodiment of the present invention, it is possible to control about transmiission of a service with an illegal copy prevention function to an extemal interface in a mobile digital broadcasting environment. Brief Description of the Drawings (16| FIG. 1 illustrates a block diagram showing a structure of a digital broadcasting receiving system according to an embodiment of the present invention. 117] FIG. 2 illustrates an exemplary structure of a data group according to the present invention. [18] FIG. 3 illustrates an RS frame according to an embodiment of the present invention. [ 19| FIG. 4 illustrates an example of an MH frame stiaictiire for transmitting and receiving mobile service data according to the present invention. [20J FIG. 5 illustrates an example of a general VSB frame structure. [21 ] FIG. 6 illustrates a example of mapping positions of the first 4 slots of a sub-frame in a spatial area with respect to a VSB frame. [22] FIG. 7 illustrates a example of mapping positions of the first 4 slots of a sub-frame in a chronological (or time) area with respect to a VSB frame. [23] FIG. 8 illustrates an exemplary order of data groups being assigned to one of 5 sub- frames configuring an MH frame according to the present invention. [24J FIG. 9 illustrates an example of a single parade being assigned to an MH frame according to the present invention. [25J FIG. 10 illustrates an example of 3 parades being assigned to an MH frame according to the present invention. [26] FIG. 11 illustrates an example of the process of assigning 3 parades .shown in FIG. 10 being expanded to 5 sub-frames within an MH frame. [27J FIG. 12 illustrates a data transmission stnicture according to an embodiment of the present invention, wherein signaling data are included in a data group so as to be transmitted. 128] FIG. 13 illusti-ates a hierarchical sii^naling stmcture accDrding to an embodiment ot" the present invention. |29] FIG. 14 illustrates an exemplary FIC body format according to an embodiment of the present invention. [30| FIG. 15 illustrates an exemplary bit stream syntax stnicture with respect to an FIC segment according to an embcxliment of the present invention. [311 FIG. 16 illustrates an exemplary bit stream syntax structure with respect to a payload of an FIC segment according to the present invention^ when an FIC type field value is eiiiiiil to "()'. |32| FIG. 17 illustrates an exemplary bit stream syntax structure of a service map table according to the present invention. |33| FIG. 18 illustrates an exemplaiy bit stream syntax structure of an MH audio descriptor according to the present invention. [34] FIG. 19 illustrates an exemplary bit stream syntax structure of an MH RTP payload type descriptor according to the present invention. [35] FIG. 20 illustrates an exemplary bit stream syntax structure of an MH current event descriptor according to the present invention. 136| FIG. 21 illustrates an exemplary bit stream syntax structure of an MH next event descriptor according to the present invention. [37] FIG. 22 illustrates an exemplary bit stream syntax stiucture of an MH system time descriptor according to the present invention. [38] FIG. 23 illustrates segmentation and encapsulation processes of a sei-vice map table according to the present invention. [39] FIG. 24 illustrates a flow chart for accessing a virtual channel using FIC and SMT according to the present invention. [40] FIG. 25 is a view showing a protocol stack of an MH system according to one embodiment of the present invention. [41] FIG. 26 is a block diagram showing the configuration of a digital broadcast receiver accoi^ding to one embodiment of the present invention. [42] FIG. 27 is a view showing another embodiment of a bit stream syntax of a service map table accoi'ding to one embodiment of the pi^esent invention. |43) FIG. 28 is a view showing the syntax of a conditional access descriptor according to one embodiment of the present invention. [44] FIG. 29 is a view showing the structLire of an RS frame according to one embodiment of the present invention. [45] FIG. 30 is a view showing an MH TP format accoixling to one embodiment of the present invention. [46] FIG. 31 is a view showing the stnicture of data encrypted at an IP level, according to one embodiment of ihe present invcntit)n. |47| FIG. 32 is a view showing the structure of data encrypted at an RTP level, according to one embodiment of the present invention. [48] FIG. 33 is a view showing the structure of data encrypted at a raw level, according to one embodiment of the present invention. |49] FIG. 34 is a view illusUating an AE.S-CTR mode encryption process which is applicable to one embodiment of the present invention. [50| FIG. 35 is a view illustrating an AE.S-CTR mode decryption process which is anplicalile tonne embodiment nf the present invention. |511 FIG. 36 is a table defining an AES-CTR mode counter value which is applicable to one embodiment of the present invention. [.'i21 FIG. 37 is a view illustrating a process of pnK'essing a residue block in an AES-CTR mode encryption/deciyption process which is applicable to one embodiment of the present invention. [53J FIG. 38 is a detailed view of an SMT including a conditional access descriptor according to one emb(xJiment of the present invention. [541 FIG. 39 is a view showing the structure of an RS frame including an MH sei-vice to which a conditional access is applied, according to one embodiment of the present invention. (55] FIG. 40 is a flowchail illustrating a control method of a digital broadcast receiver according to one emb(xliment of the present invention. [56] FIG. 41 is a table defining copy control information (CCI) according to one embodiment of the present invention. [57| FIG. 42 is a view illustrating an encryption mode indicator (EMI) shown in FIG. 41. [58] FIG. 43 is a view illustrating an analog protection system (APS) shown in FIG. 41. [59] FIG. 44 is a view illustrating a constrained image trigger (CIT) shown in FIG. 41. [601 And, FIG. 45 is a flowchaH illustrating a control method of a digital broadcast receiver and digital broadcast transmitter according to one embodiment of the present invention. Best IVlode for Carrying Out the Invention [611 Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like paits. In addition, although the terms used in the present invention are selected from generally known and used terms, some of the terins mentioned in the de- scription of the present invention have been selected by the applicant at his or her discretion, the detailed ineanings of which are described in relevant parts of the de- scriplion herein. I-urthermore, it is required thut the present invention is understood, not simply by the acaial temis used but by the meaning of each term lying within. [62] Among the tenns used in the description of the present invention, main service data coiTCspond to data that can be received by a fixed receiving system and may include audio/video (A/V) data. More specifically, the main service data may include A/V data of high definition (I ID) t)r standai'd definition (SD) levels and may al.so include diverse data types required for data broadcasting. Also, the known data corresponds to data prc-known in accordance with a pre-arranged agreement between the receiving system and the ti-aivsmitting system. Additionally, ;imong the terms used in the present invention, "IVIH" corresponds to the initials of "mobile"' and "handheld" and represents the opposite concept of a fixed-type system. Furthermore, the MH service data may include at least one of mobile sei'vice data and handheld sei-vice data, and canalso be referred to a.s "mobile service data" for simplicity. Herein, the mobile service data not only coiTBspond to MH service data but may also include any type of service data with mobile or poitable characteristics. Therefore, the mobile service data according to the present invention ai"e not limited only to the MH seiYice data. [631 Tlie above-de.scribed mobile service data may correspond to data having information, such as program execution files, stock information, and .so on, and may also coirespond to A/V data. Particularly, the mobile service data may correspond to A/V data having lower I'esolution and lower data rate as compared to the main service data. For example, if an A/V codec that is used for a conventional main service con-espond.s to a MPEG-2 codec, a MPEG-4 advanced video coding (AVC) or scalable video coding (SVC) having better image compression efficiency may be used as the A/V codec for the mobile service. Furthermore, any type of data may be transmitted as the mobile service data. For example, transport protocol expert group (TPF.G) data for broadcasting real-time transportation information may be transmitted as the mo- bileservice data. [64[ Also, a data service using the mobile service data may include weather forecast services, traffic infoimation services, stock infomnation services, viewer participation quiz programs, real-time polls and suiA'eys, interactive education broadcast programs, gaming services, services providing information on synopsis, character, background music, and filming sites of soap operas or series, services providing information on past match scores and player profiles and achievements, and services providing in- formation on product information and programs classified by service, medium, time^ and theme enabling purchase ordere to be processed. Herein, the present invention is not limited only to the services mentioned above. In the present invention, the transmitting system provides backward compatibility in the main sei^vice data so as to be received by the conventional receiving system. Herein, the main service data and the" mobile service data are multiplexed to the same physical channel and then transmitted. (651 Funhermore, the digital broadcast transmitting system according to the present invention peifonus additional encoding on the mobile service data and inseits the data already known by the receiving system and transmitting system (e.g., known data), thereby transmitting the processed data. Therefore, when using the transmitting system according to the present invention, the receiving system may receive the mobile sci"vicc data during a mobile state and may also receive the mobile service data with stability tiespitc viirinus (.listortinn and noise (iccuriing within the channel. 1661 FIG. 1 illustrates a block diagram showing a stmcture of a digital broadcasting receiving system according to an embodiment of the present invention. The digital broadcast receiving system according to the present invention includes a baseband processor 100, a management proces.sor 200, and a presentation processor 300. The baseband proce.ssor 100 includes an operation controller 110, a tuner 120. a de- modulator 130, an equalizer 140, a known sequence detector (or known data detector) 150, a block decoder (or mobile handheld block decoder) 160, a primary Reed- Solomon (RS) frame decoder 170, a secondary RS frame decoder 180, and a signaling decoder 190. The operation controller 110 controls the operation of each block included in the baseband processor 100. [67] By tuning the receiving system to a specific physical channel frequency, the tuner 120 enables the receiving system to receive main sen'ice data, which conespond to broadcast signals for fixed-type broadcast receiving systems, and mobile service data, which correspond to broadcast signals for mobile broadcast receiving systems. At this point, the tuned frequency of the specific physical channel is down-converted to an in- teiTnediate frequency (IF) signal, thereby being outputted to the demodulator 130 and the known sequence detector 140. The passbaiid digital IF signal being outpiitted from the tuner 120 may only include main service data, or only include mobile sen'ice data, or include both main service data and mobile service data. [68] The demodulator 130 perfonns self-gain control, carrier wave recovery, and timing recovery processes on the passband digital IF signal inputted from the tuner 120, thereby modifying the IF signal to a baseband signal. Then, the demodulator 130 outputs the baseband signal to the equalizer 140 and the known sequence detector 150. The demcxlulator 130 uses the known data symbol sequence inputted from the known sequence detector 150 during the timing and/or carrier wave recoveiy, thereby enhancing the demodulating peifomiance. The equalizer 140 compensates channel- associated distortion included in the signal demodulated by the demodulator 130. Then, the equalizer 140 outputs the distortion-compensated signal to the blcok decoder 160. By using a known data symbol sequence inputted from the Inown sequence detector 150, the equalizer 140 may enhance the equalizing peifonnance. Furtheimore, the equalizer 141) may receive feed-back on the decoding fesult from the block decoder 160, thereby enhancing the equalizing performance. [69] The known sequence detector 150 detects kncnvn data place (or position) inserted by the transmitting system from the input/output data (i.e., data prior to being de- modulated or data being processed with paitial demodulation). Then, the known sequence detector 150 outputs the detected known data position infonnation and known data sequence generated from the detected position information to the de- moduh'.tor 130 and the cinalizcr 14'). Additionally, in order to allow the block decoder 160 to identity the mobile service data that have been processed with additional encoding by the transmitting system and the main service data that have not been processed with any additional encoding, the knovvn se({uence detector 150 outputs such corresponding information to the block decoder 160. [70] If the data channel-equalized by the equalizer 140 and inputted to the bkx^k decoder 160 coiTespond to data processed with both block-encoding and treUis-encoding by the transmitting system (i.e., data within the RS frainc, signaling data), (he block decoder 160 may peifoim trellis-decoding and block-decoding as inverse processes of the transmitting system. On the other hand, if the data channel-equalized by the equalizer 140 and inputted to the block decoder 160 correspond to data proces.sed only with trellis-encoding and not block-encoding by the transmitting system (i.e., main service data), the block decoder 160 may pertomi only trellis-decoding. ]71 ] The signaling decoder 190 decodes signaling data that have been channel-equalized and inputted from the equalizer 140. It is assumed that the signaling data inputted to the signaling decoder 190 correspond to data processed with both block-encoding and trellis-encoding by the transmitting system. Examples of such signaling data may include transmission parameter channel (TPC) data and fast iiifonnation channel (FlC) data. Each type of data will be described in more detail in a later process. The FIC data decoded by the signaling decoder 190 aie outputted to the FIC handler 215. And, the TPC data decoded by the signlaing decoder 190 are outputted to the TPC handler 214. [72] Meanwhile, according to the present invention, the transmitting system uses RS frames by encoding units. Herein, the RS frame may be divided into a primary RS frame and a secondary RS frame. However, according to the embodiment of the present invention, the primary RS frame and the secodnary RS frame will be divided based upon the level of importance of the conesponding data. The primai^ RS frame decoder 170 receives the data outputted from the block decoder 160. At this point, according to the embodiment of the present invention, the primary RS frame decoder 170 receives only the mobile service data that have been Reed-Solomon (RS)-encoded and/or cyclic reduncancy check (CRC)-encoded from the block decoder 160. 1731 Herein, the primary RS frame decoder 170 receives (inly the mobile service data and not the main service data. 'Ihe primary RS frame decoder 170 perfonns inverse processes of an RS frame encoder (not shown) included in the digital broadcast transmitting system, thereby correcting errors existing within the primaiy RS frame. More specifically, the primaiy RS frame decoder 170 forms a primary RS frame by grouping a plurality of data groups and, then, correct errors in primary RS frame units. In other words, the primaiy RS frame dec(xler 170 decodes primary RS frames, which are being transmitted for actual broadcast services. [74! Additionally, the sccondaiy RS frame decoder I SO receives the dara outpiitted from the block decoder 160. At this point, according to the embodiment of the present invention, the secondary RS frame decoder 180 receives only the mobile service data that have been RS-encoded and/or CRC-encodetl from the block decoder 160. Herein, the secondary RS frame decoder 180 receives only the mobile service data and not the main service data. The secondaiy RS frame decoder 180 perfonns inverse processes of an RS frame encoder (not shown) included in the digital broadcast transmitting system, thereby correcting enors existing within the secondary RS frame. More specifically, the secondary RS frame decoder 180 forms a secondary RS frame by grouping a plurality of data groups and, then, correct errors in secondary RS frame units. In other words, the secondary RS frame decoder 180 decodes secondaiy RS frames, which are being transmitted for mobile audio ser\'ice data, mobile video service data, guide data, and so on. [75J Meanwhile, the management processor 200 according to an embodiment of the present invention includes an MH physical adaptation processor 210, an IP network stack 220, a streaming handler 230, a system information (SI) handler 240, a file handler 250, a multi-pui-pose internet main extensions (MIME) type handler 260, and an electronic service guide (ESG) handler 270, and an ESG decoder 280, and a storage unit 290. The MH physical adaptation processor 210 includes a primary RS frame handler 211, a secondary RS frame handler 212, an MH transport packet (TP) handler 213, a TPC handler 214, an FIC handler 215, and a physical adpatation control signal handler 216. The TPC handler 214 receives and processes baseband information required by modules con^esponding to the MH physical adaptation processor 210. The baseband information is inputted in the form of TPC data. Herein, the TPC handler 214 uses this information to process the FIC data, which have been sent from the baseband processor 100. [76] The TPC data istransmitted from the transmitting system to the receiving system via a predetermined region of a data group. The TPC data may include at least one of an MH ensemble ID, an MH sub-frame number, a total number of MH groups (TNoG), an RS frame continuity counter, a column size of RS frame (N), and an FIC version number. Herein, the MI I ensemble ID indicates an identification number of each MH ensemble cairied in the corresponding physical channel. The MH sub-frame number signifies a number identifying the MH sub-frame number in oneMH frame, wherein each MH group associated with the corresponding MH ensemble is transmitted. The TNoG represents the total number of MH groups including all of the MH groups belonging to all MH parades included in oneMH sub-frame. The RS frame continuity counter indicates a number that serves as a continuity indicatorof the RS frames caiTving the corresponding MH ensemble. Herein, the value of the RS frame continuity counter shall be incremented by I modulo 1 ensemble. Herein, the value of N determi nes the size of each MIT TP. Finally, the FTC vei-sion number signifies the version number of an FIC body carried on the cor- responding physical channel. [77] As described above, diverse TPC data are inputted to the TPC handler 214 via the signaling decoedr 190 shown in FIG. 1. Then, the received TPC data are processed by the TPC handler 214. The received TPC data may also be used by the FIC handler 215 in order to process the FIC data. The FIC handler 215 processes the FIC data by as- sociating the FIC data received from the baseband processor 100 with the TPC data. The physical adaptation control signal handler 216 collects FIC data received through the FIC handler 215 and SI data received through RS frames. Then, the physical adaptation control signal handler 216 uses the collected FIC data and SI data to configure and process IP datagrams and access information of mobile broadcast services. Thereafter, the physical adaptation control signal handler 216 stores the processed IP datagrams and access information to the storage unit 290. [78] The primary RS frame handler 211 identifies primary RS frames received from the primaiy RS frame decoder 170 of the baseband processoi' 100 for each row unit, so as to configui-e an MH TP. Thereafter, the primary RS frame handler 211 outputs the configured MH TP to the MH TP handler 213. The secondaiy RS frame handler 212 identifies secondary RS frames received from the secondaiy RS frame decoder 180 of the baseband processor 100 for each row unit, so as to configure an MH TP. Thereafter, the secondaiy RS frame handler 212 outputs the configured MH TP to the MH TP handler 213. The MH transport packet (TP) handler 213 extracts a header from each MH TP received from the primary RS frame handler 211 and the secondaiy RS frame handler 212, thereby determining the data included in the corresponding MH TP. Then, when the determined data correspond to SI data (i.e., SI data that are not en- cap.sulated to IP datagrams), the corresponding data are outputted to the physical adaptation control signal handler 216. Alterantively, when the detemiined data conespond to an IP datagram, the corresponding data are outputted to the IP network Stack 220. [79] The IP network stack 220 processes broadcast data that are being transmitted in the form of IP datagrams. More specifically, the IP network stack 220 processes data that are inputted via user datagram protocol (UDP), real-time transport protcKoI (RTP), real-time transport control protocol (RTCP), asynchronous layered coding/layered coding transport (ALC/LCT), file delivery over unidirectional transport (FLUTE), and so on. Herein, when the pnx;essed data correspond to streaming data, the cor- responding data are outputtcd to the streaming handler 230. And, when the processed data correspond tf> data in a file format, the i-firre'indniJing data are outpiitted to the file handler 250. Finally, when the pKx;essed data correspond to Sl-associated data, the conesponding data are outputted to the SI handler 240. [80] The SI handler 240 receives and processes SF data having the form of TP datagrams, which are inputted to the IP network stack 220. When the inputted data a.ssociated with SI correspond to MIME-type data, the inputted data are outputted to the MIME-type handler 260. The MIME-type handler 260 receives the MIME-type SI data outputted from the SI handler 240 and processes the received MEME-type SI data. The file handler 250 receives data from the IP network stack 220 in an object format in accordance with the ALC/LCT and FLUTE structures. The file handler 250 groups the received data to create a file format. Herein, when the corresponding file includes ESG(Electronic Sen'ice Guide), the tile is outputted to the ESG handler 270. On the other hand, when the corresponding file includes data for other file-based services, the file is outputted to the presentation controller 330 of the presentation processor 300. [81] The ESG handler 270 processes the ESG data received from the file handler 250 and stores the processed ESG data to the storage unit 290. Alternatively, the ESG handler 270 may output the processed ESG data to the ESG decoder 280, thereby allowing the ESG data to be used by the ESG decoder 280. The storage luiit 290 stores the system hiformation (SI) received from the physical adaptation control signal handler 210 and the ESG handler 270 therein. Thereafter, the storage unit 290 transmits the stored SI data to each bkx'k. [82J The ESG decoder 280 either recovers the ESG data and SI data stored in the storage unit 290 or recovers the ESG data transmitted from the ESG handler 270. Then, the ESG decoder 280 outputs the recovered data to the presentation controller 330 in a format that can be outputted to the user. The streaming handler 230 receives data from the IP network stack 220, wherein the format of the received data are in accordance with RTP and/or RTCP structures. The streaming handler 230 extracts audio/video streams from the received data, which ai-e then outputted to the audio/video (A/V) decoder 310 of the presentation pi-ocessor 300. The audio/video decoder 310 then decodes each of the audio stream and video stream received from the streaming handler 230. [83 ] The display module 320 of the presentation processor 300 receives audio and video signals respectively decoded by the AA' decoder 310. Then, the display module 320 provides the received audio and video signals to the user through a speaker and/or a screen. The presentation controller 330 con-esponds to a controller managing modules that output data received by the receiving system to the user. The channel service manager 340 manages an interface with the user, which enables the user to use channel-based broadcast services, such as channel map management, channel scnice coniiection, and so on. The application m^uiager ^50 manages an intertacc. with a user using ESG display or other application seniccs that do not correspond to channel- based services. [84] Meanwhile, the data structure used in the m.obile b!X>adcasting technology according to the embodiment of the present invention may include a data group .structure and an RS frame structure, which will now be described in detail. FTG. 2 illustrates an exemplary structure of a data group according to the present invention. FIG. 2 shows an example of dividing a data group according to the data structure of the present invention into 10 MH blocks (i.e., MH block 1 (Bl) to MH block 10 (BIO)). In this example, each MH block has the length of 16 segments. Referring to FIG. 2, only the RS parity data are all(x;ated to portions of the first 5 segments of the MH bkx;k 1 (B1) and the last 5 segments of the MH block 10 (BIO). The RS parity data are excluded in regions A to D of the data group. More specifically, when it is assumed that one data group is divided into regions A, B, C, and D, each MH block may be included in any one of region A to region D depending upon the characteristic of each MH block within the data group(For example, the characteristic of each MH block can be an in- terference level of main service data). [85] Herein, the data group is divided into a plurality of regions to be used for different purposes. More specifically, a region of the main service data having no interference or a very low interference level may be considered to have a more resistant (or sti-onger) receiving performance as compared to regions having higher interference levels. Ad- ditionally, when using a system inserting and transmitting known data in the data group, wherein the known data are known based upon an agreement between the transmitting system and the receiving system, and when consecutively long known data are to be periodically inserted in the mobile service data, the known data having a predetermined length may be periodically inserted in the region having no interference from the main service data (i.e., a region wherein the main service data are not mixed). However, due to interference from the main .service data, it is difficult to periodically insert known data and also to insert consecutively long known data to a region having interfei^ence from the main service data. [86J Referring to FIG. 2, MH block 4 (B4) to MM block 7 (B7) con-espond to regions without interference of the main service data. MH block 4 (B4) to MH block 7 (B7) within the data group shown in FIG. 2 correspond to a region where no interference from the main service data occurs. In this example, a long known data sequence is inseited at both the beginning and end of each MH block. In the description of the present invention, the region including MH block 4 (B4) to MH block 7 (B7) will be referred to as "region A (=B4+B5+B6+B7)". As described above, when the data group includes region A having a long known data sequence inscncd at both the beginning and end of each .MH block, the receiving system is capable of peifonning equalization by using the channel information that can be obtained from the known data. Therefore, region A may have the strongest equalizing perlbmiance among region A, B, C and D.. [87] In the example of the data group shown in FIG. 2, MH block 3 (B3) and MH block 8 (B8) correspond to a region having little interference from the main service data. Herein, a long known data sequence is inserted in only one side of each MH blcKrk B3 and B8. More specifically, due to the interference from the main service data, a long known data sequence is inserted at the end of MH block 3 (B3), and another long known data sequence is inserted at the beginning of MH block 8 (B8). In the present invention, the region including MH block 3 (B3) and MH block 8 (B8) will be referred to as "region B (=B3+B8)". As described above, when the data group includes region B having a long known data sequence inserted at only one side (beginning or end) of each MH block, the receiving system is capable of performing equalization by using the channel information that can be obtained from the known data. Therefore, a stronger equalizing performance as compared to region C/D may be yielded (or obtained) in region B. [88] Referring to FIG. 2, MH block 2 (B2) and MH block 9 (B9) con-espond to a region having more interference from the main ser\'ice data as compared to region B. A long known data sequence cannot be inserted in any side of MH block 2 (B2) and MH bkx:k 9 (B9). Herein, the region including MH block 2 (B2) and MH block 9 (B9) will be referred to as "region C (=B2+B9)". Finally, in the example shown in FIG. 2, MH block 1 (Bl) and MH block 10 (BIO) correspond to a region having more interference from the main service data as compared to region C. Similarly, a long known data sequence cannot be inserted in any side of MH block 1 (31) and MH block lO(BlO). Herein, the region including MH block 1 (Bl) and MH block 10 (BIO) will be referred to as "region D (-B1+B10)". Since region C/D is spaced further apart from the known data sequence, when the channel environment undergoes frequent and abrupt changes, the receiving peifomiance of region C/D may be deteriorated. [89] Additionally, the data group includes a signaling information area wherein signaling information is assigned (or allocated). In the present invention, the signaling in- formation ai'ea may start from the 1st segment t)f the 4th MH block (B4) to a portion oF the 2nd segment. According to an embodiment of the present invention, the signaling infoimation area for inserting signaling infomnation may start from the 1st segment of the 4th MH block (B4) to a portion of the 2nd segment. More specifically, 276(=207+69) bytes of the 4th MH block (B4) in each data group are assigned as the signaling information area. In other words, the signaling information area consists of 207 bytes of the ist segment and the firet 69 bytes of the 2nd segment of the 4th MH block fB4). The 1st segment of the 4th MH block fB4) coiresponds to the 17th or 173rd segment of a VSB field. [901 Herein, the signaling information may be identified by two different types of signaling channels: a transmission parameter channel (TPC) and a fast infonnation channel (FIC). Herein, the TPC data may include at least one of an Mil ensem.ble ID, an MH sub-frame number, a total number of MH groups (TNoG), an RS frame continuity counter, a column size of RS frame (N), and an FIC vereion number. However, the TPC data (or information) presented herein are merely exemplary. And, since the adding or deleting of signaling infcmiation included in the TPC data may be easily adjusted and modified by one skilled in the art, the present invention will, therefore, not be limited to the examples set forth herein. Furthermore, the FIC is provided to enable a fast sei-vice acquisition of data receivers, and the FIC includes cross layer information between the physical layer and the upper layer(s). [91] For example, when the data group includes 6 known data sequences, as shown in FIG. 2, the signaling information ai'ea is located between the first known data sequence and the second known data sequence. More specifically, the fii^st known data sequence is inserted in the last 2 segments of the 3rd MH block (B3), and the second known data sequence isinserted in the 2nd and 3rd segments of the 4th MH block (B4). Furthermore, the 3rd to 6th known data sequences are respectively inserted in the last 2 segments of each of the 4th, 5th, 6th, and 7th MH blocks (B4, B5, 86, and B7). The 1st and 3rd to 6th known data sequences are spaced apart by 16 segments. [92] FIG. 3 illustrates an RS frame according to an embodiment of the present invention. The RS frame shown in FIG. 3 corresponds to a collection of one or more data groups. The RS frame is received for each MH frame in a condition where the receiving system receives the FIC and processes the received FIC and where the receiving system is switched to a time-slicing mode so that the receiving system can receive MH ensembles including ESG entry points. Each RS frame includes each service or IP streams of ESG, and SMT section data may exist in all RS frames. The RS frame according to the embodiment of the present invention consists of at least one MH transport packet (TP). Herein, the MH TP includes an MH header and an MH payload. [93] The MH payload may include mobile service data as wekk as signaling data. More specifically, an MH payload may include t)nly mobile sei-vice data, or may include only signaling data, or may include both mcibile seiTice data and signaling data. According to the embodiment of the present invention, the MH header may identify (or distinguish) the data types incUided in the MH payload. More specifically, when the MH TP includes a first MH header, this indicates that the MH payload includes only the signaling data. Also, when the MH TP includes a second MH header, this indicates that the MH payload includes both the signaling data and the mobile service data. Finally, when Mil TP includes a third MH header, this indicates that the MH payload includes onl^^ the mobile scr\'ice data !n the exam'^le shown in FI^ 3 ^h*^ ^S ^v^imp it^ assigned with IP datagrams (for example, IP datagram 1 and IP datagram 2) for two service types. [94] FIG. 4 illustrates a structure of a MH frame for transmitting and receiving mobile service data according to the present invention. In the example shown in FIG. 4, one MH frame consists of 5 sub-frames, wherein each sub-frame includes 16 slots. In this case, the MH frame according to the present invention includes 5 sub-frames and 80 slots. Also, in a packet level, one slot is configured of 156 data packets (i.e., transport stream packets), and in a symbol level, one slot is configured of 156 data segments. Herein, the size of one slot corresponds to one half (1/2) of a VSB field. More specifically, since one 2()7-byte data packet has the same amount of data as onedata segment, a data packet prior to being interleaved may also be used as a data segment. At this point, two VSB fields are grouped to form a VSB frame. [95] FIG. 5 illustrates an exemplaiy structure of a VSB frame, wherein one VSB frame consists of 2 VSB fields (i.e., an odd field and an even field). Herein, each VSB field includes a field synchronization segment and 312 data segments. The slot corresponds to a basic time unit for multiplexing the mobile service data and the main service data. Herein, one slot may either include the mobile sen'ice data or be configured only of the main service data. If the first 118 data packets within the slot correspond to a data group, the remaining 38 data packets become the main sen'ice data packets. In another example, when no data group exists in a slot, the corresponding slot is configured of 156 main seiTice data packets. Meanwhile, when the slots are assigned to a VSB frame, an off-set exists for each assigned position. [96] FIG. 6 illustrates a mapping example of the positions to which the first 4 slots of a sub-frame ai^e assigned with respect to a VSB frame in a spatial area. And, FIG. 7 il- lustrates a mapping example of the positions to which the first 4 slots of a sub-frame are assigned with respect to a VSB frame in a chronological (or time) area. Refeiring to FIG. 6 and FIG. 7, a 38th data packet (TS packet #37) of a 1 st slot (Slot #0) is mapped to the 1st data packet of an cxid VSB field. A 38th data packet (TS packet #37) of a 2nd slot (Slot #1) is mapped to the 157th data packet of an odd VSB field. Also, a 38th data packet (TS packet #37) of a 3nJ slot (Sk)t #2) is mapped to the 1st data packet of an even VSB field. And, a 3S:h data packet (TS packet #37) of a 4th slot (Slot #3) is mapped to the 157th data packet of an even VSB field. Similarly, the remaining 12 slots within the conesponding sub-frame are mapped in the subsequent VSB frames using the same method. [97] FICj. 8 illustrates an exemplary assignement order of data groups being assigned to one of 5 sub-frames, wherein the 5 sub-frames configure an MH frame. For example, the method of assigning data groups may be identically applied to all MH frames or differently applied to each Ml! frame. Furthermore, the method of assingiug data groups may be identically applied to all sub-frames or differently applied to each sub- frame. At this point, when it is assumed that the data groups are assigned using the same method in all sub-frames of the corresponding MH frame, the total number of data groups being assigned to an MH frame is equal to a multiple of '5'. According to the embodiment of the present invention, a plurality of consecutive data groups is assigned to be spaced as far apart from one another as possible within the sub-frame. Thus, the system can be capable of responding promptly and effectively to any burst eiTor that may occur within a sub-frame. 1981 For example, when it is assumed that 3 data groups are assigned to a sub-frame, the data groups are assigned to a 1st slot (Slot #0), a 5th slot (Slot #4), and a 9th slot (Slot #8) in the sub-frame, respectively. FIG. 8 illustrates an example of assigning 16 data groups in one sub-frame using the above-de.scribed pattern (or rule). In other words, each data group is serially assigned to 16 slots corresponding to the following numbers: 0, 8, 4, 12, 1, 9, 5, 13, 2, 10, 6, 14, 3, II, 7, and 15. Equation 1 below shows the above-described rule (or pattern) for assigning data groups in a sub-frame. [99] [1(X)] Equation 1 [101] [102] j = (4i-I-O) mod 16 [103] [104] Herein, O = 0 if i [105] 0=2elseifi [1061 0=lelseifi [107] 0 = 3 else. [108] [ 109] Herein, j indicates the slot number within a sub-frame. The value of j may range from 0 to 15. Also, vaiiable i indicates the data group number. The value of i may range from 0 to 15. [110] In the present invneiton, a collection of data groups included in a MH frame will be referred to as a "parade". Based upon the RS frame mode, the parade transmits data of at least one specific RS frame. The mobile service data within one RS frame may be assigned either to all of regions A/B/C/D within the con^esponding data group, or to at least one of regions A/B/C/D. In the embodiment of the present invention, the mobile service data within one RS frame may be assigned either to all of regions A/B/C/D, or to at least (jne of regions A/B and regions C/D. If the mobile service data are assigned to the latter case (i.e., one of regions A/B and regions C/D), the RS frame being assigned to regions A/B and the RS frame being assigned to regions C/D within the corresponding' data "roup are different troin one jinother. 11111 According to the embtxliment of the present invention, the RS frame being assigned to regions A/B within the coiresponding data group will he refeired to as a "piimary .RS frame", and the RS .frame being assigned to regions C/D within the cori'esponding data group will be referred to as a "secondary RS frame", for simplicity. Also, the primary RS frame and the secondary RS frame fonn (or configure) one parade. More specifically, when the mobile service data within one RS frame are assigned either to all of regions A/B/C/D within the coiTesponding data group, one parade transmits one RS frame. Conversely, when the mobile service data within one RS frame are assigned either to at least one of regions A/B and regions C/D, one parade may transmit up to 2 RS frames. More specifically, the RS frame mode indicates whether a parade transmits one RS frame, or whether the parade transmits two RS frames. Such RS frame mode is transmitted as the ab(we-described TPC data. Table 1 below shows an example of the RS frame mode. [112] II13J Table] [Table 1 ] [Table ] RS frame mode Description 00 There is only a primary RS frame for all Group Regions 01 There ai-e two separate RS frames- Primaiy RS frame for Group Region A and B- Secondary RS frame for Group Region C and D 10 Reserved 11 Reserved [114] [115J Table 1 illustrates an example of allocating 2 bits in order to indicate the RS frame inode. For example, referring to Table 1, when the RS frame mode value is equal to "00% this indicates that one parade transmits one RS frame. And, when the RS frame mode value is equal to '01', this indicates that one parade transmits two RS frames, i.e., the primaiy R.S frame and the secondai-y R.S frame. More .specifically, when the RS frame mode value is equal to '01', data of the primary RS frame for regions A/B are assigned and transmitted to regions A/B of the corresponding data group. Similarly, data of the secondary RS frame for regions C/D are assigned and transmitted to regions C/D of the coiresponding data group. [116! As described in the assignment of data groups, the parades are also assigned to be spaced as far apart fro.T. one another as po.';sib!c within the .sub-frame. Thus, the system can be capable of responding promptly and effectively lo any burst err(.)r that may occur within a sub-frame. Furthermore, the method of assigning parades may be identically applied to all MH frames or differently applied lo each Mf-I fram.e. According to the embodiment of the present invention, the parades may be assigned differently for each sub-frame and identically for all sub-frames within an MH frame. However, according to the embodiment of the present invention, the parades may be assigned differently for each MH frame and identically for all sub-frames within an MH frame. More specifically, the MH frame stiiicture inay vary by MH frame units. Thus, an ensemble rate may be adjusted on a more frequent and flexible basis. [117] FIG. 9 illustrates an example of multiple data groups of a single parade being assigned (or allocated) to an MH frame. More specifically, FIG. 9 illustrates an example of a single parade, wherem the number of data groups included in a sub-frame is equal to '3', being allocated to an MH frame. Referring to FIG. 9, 3 data groups are sequentially assigned lo a sub-frame at a cycle period of 4 slots. Accordingly, when this process is equally performed in the 5 sub-frames included in the corresponding MH frame, 15 data groups are assigned to a single MH frame. Herein, the 15 data groups coiTespond to data groups included in a parade. Therefore, since one sub-frame is configured of 4 VSB frame, and since 3 data groups are included in a sub-frame, the data group of the corresponding parade is not assigned to one of the 4 VSB frames within a sub-frame. [118] For example, when it is assumed that one parade transmits one RS frame, and that a RS frame encoder (not shown) included in the transmitting system perfonns RS- encoding on the corresponding RS frame, thereby adding 24 bytes of parity data to the corresponding RS frame and transmitting the processed RS frame, the parity data occupy approximately 11.37% (=24/(187-t-24)x]00) of the total RS code word length. Meanwhile, when one sub-frame includes 3 data groups, and when the data groups included in the parade are assigned, as shown in FIG. 9, 15 data groups form an RS frame. Accordingly, even when an eiTor occurs in an entire data group due to a burst noise within a channel, the percentile is merely 6.67% (=1/15x100). Therefore, the receiving system may correct all errors by pertbrming an erasure RS decoding process. More specifically, when the erasure RS decoding is performed, a number of channel em)|-s corresponding to the number of RS parity bytes may be corrected and bytes error among one RS code word that is less than the number of RS parity bytes may be coirected. By doing so, the receiving system may correct the eixor of at least one data group within one parade. Thus, the minimum burst noise length correctable by a RS frame is over 1 VSB frame. [119] Meanwhile, when data groups of a pai'adc are assigned as shown in FIG. 9, either responding to different parades may be assigned between each data group. More specifically, data groups corresp<. to multiple parades may be assigned one> MH frame. Basically, the method of assigning data groups corresponding to multiple parades is similai" to the method of assigning data groups corresponding to a single parade. In other words, data groups included in other parades that are to be assigned to an MH frame are also respectively assigned according to a cycle period of 4 slots. At this point, data groups of a different parade may be sequentially assigned to the respective slots in a circular method. Herein, the data groups are assigned to slots starting from the ones to which data groups of the previous parade have not yet been assigned. For example, when it is assumed that data groups coiTesponding to a parade are assigned as shown in FIG. 9, data groups corresponding to the next parade may be assigned to a sub-frame starting either from the 12th slot of a sub-frame. However, this is merely exemplary. In another example, the data groups of the next parade may also be sequentially assigned to a different slot within a sub-frame at a cycle peiiod of 4 slots starting from the 3rd slot. [120] FIG. 10 illustrates an example of transmitting 3 parades (Parade #0, Parade #1, and Parade #2) viaan MH frame. More specifically, FIG. 10 illustrates an example of transmitting parades included in one of 5 sub-fi^ames, wherein the 5 sub-frames configure one MH frame. When the 1st pai-ade (Parade #0) includes 3 data groups for each sub-frame, the positions of each data groups within the sub-frames may be obtained by substituting values '0' to '2' for i in Equation 1. More specifically, the data groups of the 1st parade (Pai'ade #0) are sequentially assigned to the 1st, 5th, and 9th slots (Slot #0, Slot #4, and Slot #8) within the sub-frame. Also, when the 2nd parade includes 2 data groups for each sub-frame, the positions of each data groups within the sub-frames may be obtained by substituting values '3' and '4' for i in Equation 1. More specifically, the data groups of the 2nd parade (Parade # 1) are se- quentially assigned to the 2nd and 12th slots (Slot #1 and Slot #11) within the sub- frame. Finally, when the 3rd parade includes 2 data groups for each sub-frame, the positions of each data groups within the sub-frames may be obtained by substituting values '5' and "6' tor i in Equation 1. More specil ically, the data groups of the 3rd parade (Parade #2) are sequentially assigned to the 7th and 11 th slots (Slot #6 and Slot #10) within the sub-frame. 1121 j As described above, data gmups of multiple parades may be assigned to a single MH frame, and, in each sub-frame, the data groups are serially allocated to a group space having 4 slots from left to right. Therefore, a number of groups of one parade per sub- frame (NoG) may correspond to any one integer from ' T to '8'. Herein, since one MH frame includes 5 sub-frames, the total number of data groups within a parade that can be allocated to an ^'IH trame ma^^ coitcsooivJ to any one multiple of '5' ran^in*"^ from •5'to'40'. f 122] FIG. 11 illustrates an example of expanding the assignment process ol' 3 parades. shown in RG. 10, to 5 sub-frames within an MH frame. FIG. 12 illustrates a data transmission structure according to an embcxliment of the present invention, wherein signaling data are included in a data group so as to be transmitted. As described above, an MH frame is divided into 5 sub-frames. Data groups coixesponding to a plurality of parades co-exist in each sub-frame. Herein, the data groups corresponding to each parade are grouped by MH fram units, thereby configuring a single parade. 11231 The data structure shown in FIG. 12 includes 3 parades, one ESG dedicated channel (EDC) parade (i.e., parade with N(;)G=I), and 2 service parades (i.e., parade with NoG=4 and parade with NoG=3). Also, a predetermined portion of each data gniup (i.e., 37 bytes/data group) is used for delivering (or sending) FIC information associated with mobile service data, wherein the FIC information is separately encoded from the RS-encoding process. The FIG region assigned to each data group consists of one FIC segments. Herein, each FIC segment is interleaved by MH sub-frame units, thereby configuring an FIC body, which coiresponds to a completed FIC transmission structure. However, whenever required, each FIC segment may be interleaved by MH frame units and not by MH sub-frame units, thereby being completed in MH frame units. [124J Meanwhile, the concept of an MH ensemble is applied in the embodiment of the present invention, thereby defining a collection (or group) of services. Each MH ensemble cairies the same QoS and is coded with the same FEC code. Also, each MH ensemble has the same unique identifier (i.e., ensemble ID) and corresponds to consecutive RS frames. As shown in FIG. 12, the FIC segment corresponding to each data group may describe service information of an MH ensemble to which the cor- responding data group belongs. When FIC segments within a sub-frame are grouped and deinterieved, all seiTice information of a physical channel through which the cor- responding FICs are transmitted may be obtained. Therefore, the receiving system may be able to acquire the channel information of the conesponding physical channel, after being processed with physical channel tuning, during a sub-frame period. FLirthermore, FIG. 12 illustrates a structure further including a separate EDC parade apart from the service parade and wherein electronic service guide (HSG) data are transmitted in the 1st slot of each sub-frame. [ 1251 FIG. 13 illustrates a hierarchical signaling stmcture according to an embodiment of the present invention. As shown in FIG. 13, the mobile broadcasting techonology according to the embodiment of the present invention ad()pts a signaling method using FfC and SMT. In the description of the present invention, the signaling structure will be referred to as a hierarchical siiinaiing structure. F-lereinaftcr, a detailed description on how the receiving system accesses a virtual channel via FlC and SNTI v/ill now be given with reference to FIG. 13. The FIC b(xJy defined in an IVIH transport (Ml) identifies the physical location of each the data stream for each viitual channel and provides very high level descriptions of each virtual channel. Being MH ensemble level signaling information, the service map table (SMT) pmvides MH ensemble level signaling information. The SMT provides the IP access information of each virtual channel belonging to the respective MH ensemble within which the SMT is carried. The SMT also provides all IP stream component level information required for the virtual channel service acquisition. [126] Referring to FIG. 13, each MH ensemble (i.e.. Ensemble 0, Ensemble 1,..., Ensemble K) includes a stream infonnation on each a.sscK;iated (or corresponding) virtual channel (e.g., viitual channel 0 IP stream, virtual channel 1 IP stream, and virtual channel 2 IP stream). For example. Ensemble 0 includes viitual channel 0 IP stream and virtual channel 1 IP stream. And, each MH ensemble includes diverse in- formation on the associated viitual channel (i.e., Virtual Channel 0 Table Entry, Virtual Channel 0 Access Info, Virtual Channel 1 Table Entry, Virtual Channel I Access Info, Virtual Channel 2 Table Entry, Viitual Channel 2 Access Info, Viraial Channel N Table Entry, Virtual Channel N Access Info, and .so on). The FIC body payload includes information on MH ensembles (e.g., ensemble_id field, and referred to as "ensemble location" in FIG. 13) and information on a virtual channel associated with the corresponding MH ensemble (e.g., major_channel_num field and minor_channel_num field, and referred to as "Virtual Channel 0", "Virtual Channel 1", ..., "Viitual Channel N" in FIG. 13). [127] The application of the signaling structure in the receiving system will now be described in detail. When a user selects a channel he or she wishes to view (hereinafter, the user-selected channel will be refened to as "channel 0" for simplicity), the receiving system first parees the received FIC. Then, the receiving system acquires infoiTnation on an MH ensemble (i.e., ensemble location), which is associated with the virtual channel coiTesponding to channel 0 (hereinafter, the cor- responding Ml I ensemble will be referred to as "Ml I ensemble 0" for simplicity). By acquiring slots only corresponding to the MH ensemble (1 using the time-slicing method, the receiving system configures ensemble 0. The ensemble 0 configured as described above, includes an SMT on the associated viilual channels (including channel G) and IP streams on the coiresponding virtual channels. Therefore, the receiving system uses the SMT included in the MM ensemble 0 in order to acquire various information on channel 0 (e.g.. Virtual Channel 0 Table Entry) and stream access information on channel 0 (e.g., Virtual Channel 0 Access Info). The receiving s^'stem uses the stream ^iccess iiifoniiatioii on clmiiiicl 0 to receive onl^' the associiiUed IP streams, thereby pi-oviding channel 0 services to the user. [ 128J The digital broadcast receiving system according to the present invention adopts the fast information channel (FIC) for a faster access to a service that is currently being broadcasted. More specifically, the FTC handler 215 of FIG. 1 parses the FIC body, which corresponds to an FIC transmission structure, and outputs the parsed result to the physical adaptation control signal handler 216. FIG. 14 illustrates an exemplary FIC body format according to an embodiment of the present invention. According to the embtxJiment of the present invention, the FIC format consists of an FIC body header and an FIC bcxJy payload. [ 129] Meanwhile, according to the embodiment of the present invention, data are transmitted through the FIC body header and the FIC body payload in FIC segment units. Each FIC segment has the size of 37 bytes, and each FIC segment consists of a 2-byte FIC segment header and a 35-byte FIC segment payload. More specifically, an FIC body configured of an FIC body header and an FIC body payload, is segmented in units of 35 bytes, which are then cairied in FIC segment payload within at least one of FIC segment, so as to be transmitted. In the description of the present invention, an example of iaserting one FIC segment in one data group, which is then transmitted, will be given. In this case, the receiving system receives a slot corresponding to each data group by using a time-slicing method. [130] The signaling decoder 190 included in the receiving system shown in FIG. 1 collects each FIC segment inserted in each data group. Then, the signaling decoder 190 uses the collected FIC segments to created a single FIC body. Thereafter, the signaling decoder 190 performs a decoding process on the FIC body payload of the created FIC body, so that the decoded FIC body payload coiresponds to an encoded result of a signaling encoder (not shown) included in the transmitting system. Subsequently, the decoded FIC body payload is outputted to the FIC handler 215. The FIC handler 215 parses the FIC data included in the FIC body payload, and then outputs the parsed FIC data to the physical adaptation control signal handler 216. The physical adaptation conti'ol signal handler 216 uses the inputted FIC data to perform processes associated wilh MH ensembles, virtual channels, SMTs, and so on. 11311 According to an embodiment of the present invention, when an FIC body is segmented, and when the size of the last segmented portion is smaller than 35 data bytes, it is assumed that the lacking number of data bytes in the FIC segment payioad is completed with by adding the same number of stxilTing bytes therein, so that the size of the last FIC segment can be equal to 35 data bytes. However, it is appoi-ent that the above-described data byte values (i.e., 37 bytes for the FIC segment, 2 bytes for the FIC segment header, and 35 bytes fur the FIC segment payioad) are merely exemplaiy, and will, therefore, not limit the scope of the present invention. 1132) FIG. 15 illustrates an exemplary bit stream syntax structure with respect to an FIC segment according to an embodiment of the present invention. Herein, the FIC segment signifies a unit used for transmitting the FIC data. The FIC segment consists of an FIC segment header and an FIC segment payioad. Refeiring to FIG. 15, the FIC segment payioad coiTesponds to the portion starting from the 'for' loop statement. Meanwhile, the FIC segment header may include a FIC_type field, an eni3r_indicator field, an FIC„seg_number field, and an FlC_last_seg_number field. A detailed de- scription of each field will now be given. 11331 The FlC_type field is a 2-bit field indicating the type of the corresponding FIC. The en-or_indicator field is a 1 -bit field, which indicates whether or not an error has occun^ed within the FIC segment duiing data transmission. If an error has occurred, the value of the errorjndicator field is set to ' 1'. More specifically, when an error that has failed to be recovered still remains during the configuration process of the FIC segment, the error_indicator field value is set to '1'. The eiTor_indicator field enables the receiving system to recognize the presence of an en'or within the FIC data. The FIC_seg_number field is a 4-bit field. Herein, when a single FIC body is divided into a plurality of FIC segments and transmitted, the FlC_seg_number field indicates the number of the corresponding FIC segment. Finally, the FIC_Iast_seg_number field is also a 4-bit field. The FIC_Iast_seg_number field indicates the number of the last FIC segment within the con"esponding FIC body. [134] FIG. 16 illustrates an exemplary bit stream syntax structure with respect to a payioad of an FIC segment according to the present invention, when an FIC type field value is equal to '0'. According to the embodiment of the present invention, the payioad of the FIC segment is divided into 3 different regions. A first region of the FIC segment payioad exists only when the FIC_seg_number field value is equal to '0'. Herein, the first region may include a current_next_indicator field, an ESG_version field, and a transport_stream_id field. However, depending upon the embodiment of the present invention, it may be assumed that each of the 3 fields exists regai"dless of the FIC_seg_number field. [1351 The cuiTeiit__next_indicalor field is a ]-bil field. The cuiTeiit_,nextJndicator field acts as an indicator identifying whether the conespnnding FIC data cany Mil ensemble configuration information of an MH frame including the cunent FIC segment, or whether the corresponding FIC data cairy MH ensemble configuration information of a next MH frame. The ESG_version field is a 5-bit field indicating ESG version in- formation. Herein, by providing version information on the service guide providing channel of the corresponding ESG, the ESG.version field enables the receiving system to notify whether or not the corresponding ESG has been updated. Finally, the transport_strcairt_id field is a 16-bit field acting as a unique identifier of a broadja.'it stream through which the corresponding FIC segment is being transmitted, f 136] A second region of the FIC segment payload coiresponds to an ensemble loop region, which includes an ensemble_id field, an SLversion field, and a num_channel field. More specifically, the ensembleid field is an 8-bit field indicating identifiers of an MH ensemble through which MH services are transmitted. Herein, the ensemble_id field binds the MH services and the MH ensemble. The SI_version field is a 4-bit field indicating version information of SI data included in the corresponding ensemble, which is being transmitted within the RS frame. Finally, the num„channel field is an 8-bit field indicating the number of virtual channel being transmitted via the cor- responding ensemble. [137] A third region of the FIC segment payload a channel loop region, which includes a channeMype field, a channel_activity Field, a CA_indicator field, a stand_alone_service_indicator field, a major_channel_num field, and a minor_channel_num field. The channel_type field is a 5-bit field indicating a service type of the corresponding virtual channel. F(jr example, the channel__type field may indicates an audio/video channel, an audio/video and data channel, an audio-only channel, a data-only channel, a file download channel, an ESG deliveiy channel, a no- tification channel, and so on. The channeLactivity field is a 2-bit field indicating activity information of the coiTcsponding virtual channel. More specifically, the channeLactivity field may indicate whether the cun-ent virtual channel is providing the cuirent service. [138] The CA_indicator field is a 1-bit field indicating whether or not a conditional access (CA) is applied to the current virtual channel. The stand_alone_service_indicator field is also a 1 -bit field, which indicates whether the seiTice of the corresponding virtual channel corresponds to a stand alone service. The major_channel_num field is an 8-bit field indicating a major channel number of the corresponding vinual channel. Finally, the minor_channel_num field is also an 8-bit field indicating a minor channel number of the conesponding virtual channel. [ 139] FIG. 17 illustrates an exemplary bit stream syntax stiiicaire of a seiTice map table (hereiiiufter refened to as '"SMT") according to the present invention. According to the embodiment of the present invention, the SMT is configured in an MPnG-2 private section format. However, this will not limit the scope and spirit of the present invention. The SMT according to the embodiment of the present invention includes desription information for each virtual channel within a single MH ensemble. And, additional infonTialit)n may further be included in each desciiptor area. Herein, the SMT according to the embodiment of the present invention includes at least one field and is transmitted from the transmitting sj'stem to the receiving system. I 1 -MJ 1 rt.S UL-hV-l iLH^Li 111 I iVJ. J», lllL^ OlVl 1 SL^V-liVyil IIILXV KJ^ Ll l^llNllllLL,..ia LvV Uolll MH TP within the RS frame. In this case, each of the RS frame decoders 170 and 180, shown in FIG. 1, decodes the inputted RS frame, respectively. Then, each of the dec(xled RS frames is outputted to the respective RS frame handler 2 i 1 and 212. Thereafter, each RS frame handler 211 and 212 identifies the inputted RS frame by row units, so as to create an MH TP, thereby outputting the created MH TP to the MH TP handler 213. When it is determined that the corresponding MH TP includes an SMT section based upon the header in each of the inputted MH TP, the MH TP handler 213 parses the corresponding SMT section, so as to output the SI data within the parsed SMT section to the physical adaptation control signal handler 216. However, this is limited to when the SMT is not encapsulated to IP datagrams. [ 141 ] Meanwhile, when the SMT is encapsulated to IP datagrams, and when it is determined that the corresponding MH TP includes an SMT section based upon the header in each of the inputted MH TP, the MH TP handler 213 outputs the SMT section to the IP network stack 220. Accordingly, the IP network stack 220 performs IP and UDP processes on the inputted SMT section and, then, outputs the processed SMT section to the SI handler 240. The SI handler 240 parses the inputted SMT section and controls the system so that the pai'sed SI data can be stroed in the storage unit 290. The following corresponds to example of the fields that may be transmitted through the SMT. [ 142J The table_ id field cone.sponds to an 8-bit unsigned integer number, which indicates the type of table section being defined in the service map table(SMT). The ensemble_id field is an 8-bit unsigned integer field, which coiresponds to an ID value associated to the corresponding MH ensemble. Herein, the ensemb]e_id field may be assigned with a value ranging from range '0x00' to 'Ox3F'. It is preferable that the value of the ensemble_id field is derived from the parade_id of the TPC data, which is carried from the baseband processor of MH physical layer subsystem. When the cor- responding MH ensemble is transmitted through (or cairied over) the primary RS frame, a value of '0' may be used for the most significant bit (MSB), and the remaining 7 bits are used as the parade_id value of the associated MH parade (i.e., for the least significant 7 bits). Alternatively, when the coiresponding Mil ensemble is transmitted through (or carried over) the secondary RS frame, a value of ' I' may be used for the most significant bit (MSB). [ 143| The num_channels field is an 8-bit field, which specifies the number of virtual channels in the conesponding SMT section. Meanwhile, the SMT according to the em- bodimentof the present invention pn)vides information on a plurality of viraial channels using the 'for' loop statement. The major_channel_num field corresponds to an 8-bit field, which represents the major channel number associated with the cor- responding viitiial channel. Herein, the majt!r_char.;ieL;-!um field may be assigned with a value ranging from 'OxCKJ' to 'OxFF'. The min()r_channel_num field corresponds to an 8-bit field, which represents the minor channel number associated with the corresponding virtual channel. Herein, the minor^channeLnum field may be assigned with a value ranging from '0x00" to 'OxFF'. [1441 The short_channel_name field indicates the short name of the virtual channel. The service_id field is a 16-bit unsigned integer number (or value), which identifies the virtual channel seiTice. The servicc_type field is a 6-bit enumerated type field, which identifiesthe type of service cairied in the coiTCsponding virtual channel as defined in Table 2 below. [145J [ 146] Table 2 (Table 21 [Table ] 0x00 [Reserved] 0x01 ]VlH_digital_television - The virtual channel carries television programming (audio, video and optional associated data) conforming to ATSC standards. 0x02 MH_audio - The virtual channel canies audio prograinining (audio service and optional associated data) conforming to ATSC standards. 0x03 MH_data_only_seiTice - The virtual channel cames a data sei^ice confomiing to ATSC standards, but no video or audio component. 0x04- [Reserved for future ATSC use] OxFF [147] [148] The viitual_channeL.activity field is a 2-bit enumerated field identifying the activity status of the corresponding viitual channel. When the most significant bit (MSB) of the virtual_channel_activity field is T, the virtual channel is active, and when the most significant bit (MSB) of the virtual_channel_activity field is '0', the viitual channel is inactive. Also, when the least signillcant bit (LSB) of the viilLial_channel_activity field is '1', the virtual channel is hidden (when set to I), and when the least significant bit (LSB) of the virtual_channel_activity field is '()', the virtual channel is not hidden. The num_components field is a 5-bit field, which specifies the number of IP stfeam components in the corresponding virtual channel. The lP„version_flag field coiresponds to a ]-bit indicator. More specifically, when the value of the lP._version_.flag field is set to ' 1', this indicates that a source_iP_address field, a virt!jal_channel_tai-get_rP_address field, and a componcnt_targct_lP_addrcss field are IPv6 addicsscs. AltciTiativcly, v.'hcn the value of the lP.,vcrsiori_flag field is set to '0', this indicates that the souice_iP_address field, the virtQal_channcl_target_IP_address Held, and the component_target_IP_address field are IPv4 addresses. [ 149] The soiirce_IP_address_flag field is a 1-bit Boolean flag, v.'hich indicates, when set, that a source IP address of the corresponding virtual channel exist for a specific multicast source. The virtual_channel_taiget_lP_address_flag field is a 1-bit Boolean flag, which indicates, when set, that the conesponding IP stream component is delivered through IP datagrams with taiget IP addresses different from the virtual_channel_target_!P_address. Therefore, when the flag is set, the receiving system (or receiver) uses the component_target_IP_address as the target_IP_address in order to access the corresponding IP stream component. Accordingly, the receiving system (or receiver) may ignore the viraial_channel_ tai-get_IP_address field included in the num_.channels loop. [150J The source_IP_address field corresponds to a 32-bit or 128-bit field. Herein, the source_IP_address field will be significant (or present), when the value of the source_IP.,address_flag field is set to M'. However, when the value of the source_IP._address_flag field is set to '0', the source_JP_address field will become in- significant (or absent). More specifically, when the source_lP_address_flag field value is set to '1', and when the IP_version_flag field value is set to '0', the soiirce_IP_address tield indicates a 32-bit IPv4 address, which shows the source of the coiTesponding virtual channel. Alternatively, when the IP_version_flag field value is set to T, the source_IP_address field indicates a J 28-bit IPv6 address, which shows the source of the corresponding virtual channel. [ 1511 The virtual_channel_target_IP_address field also conesponds to a 32-bit or 128-bit field. Herein, the VLrtual_channel_target_IP_address field will be significant (or present), when the value of the virtual_channel_target_IP_address_tlag field is set to ' 1'. However, when the value of the virtual_channel_target_IP_address_fiag field is set to '0', the virtual_channel_target_IP_address field will become insignificant (or absent). More specifically, when the virtual_channeLtarget_IP_address_flag field value is set to '1', and when the IP_version_tlag field value is set to '0', the virtual_i:hannel_target_IP_a(Jdiess lield indicates a 32-bit target IPv4 address associated to the corresponding virtual ciiannel. Alternatively, when the virtua]_channel_target_IP_addressJ1ag field value is set to '1', and when the IP_vcrsion_flag field value is set to M', the viraiaLchanneLtarget_IP_address field indicates a 64-bit target IPv6 address associated to the corresponding virtual channel. If the virtual_channel_target_IP_address field is insignificant (or absent), the component _target_IP_address field within the num_channels loop should become significant (or present). And, in order to enable the receiving system to access the IP stream coriiporicni, the componcnt_targCt_!P_addrcs:; field should be used. 1152] Meanwhile, the SMT according to the embodiment of the present invention uses a 'for' loop statement in order to provide information on a plurality of ct)mponents. Merein, the RTP_payload_type field, which is assigned with 7 bits, identifies the encoding format of the component based upon Table 3 shown below. When the IP stream component is not encapsulated to RTP, the RTP_payload_type field shall be ignored (or deprecated). Table 3 below shows an example of an RTP payload type. [153J 1154] Table 3 [Table 31 [Table [ RTP_payload_type Meaning 35 AVC video 36 MH audio 37-72 [ Reserved for future ATSC use] [155] [156] The component_target_IP_address_flag field is a 1-bit Boolean flag, which indicates, when set, that the coiresponding IP stream component is delivered through IP datagrams with target IP addresses different from the virtual_channel_target_IP_address. Furthermore, when the component_target_IP_address_fIag is set, the receiving system (or receiver) uses the component_target_IP_address field as the target IP address to access the corresponding IP stream component. Accordingly, the receiving system (or receiver) will ignore the virtual_channel_target_lP_address field included in the num_channels loop. The component_target_IP_address field con-esponds to a 32-bit or 128-bit field. Herein, when the value of the rP_version_flag field is set to '0', the component_target_IP_address field indicates a 32-bit target IPv4 address associated to the corresponding IP stream component. And, when the value of the IP_version_flag field is set to '1', the comp()nent_target_IP_addre.ss field indicates a 128-bit target IPv6 address associated to the corresponding IP stream component. [157] The port_niinn_coiint field is a 6-bit field, which indicates the numher of UDP ports ass(x;iated with the corresponding IP stream component. A target UDP port number value starts from the target_UDP_port_num field value and increases (or is in- cremented) by 1. For the RTP stream, the target UDP port number should start from the target_UDP_.port..num field value and shall increase (or be incremented) by 2. This is to incoiporate RTCP streams associated with the RTP streams. 1 ijo| Tlic tdiget_UDP_poit_nuni field is a 1 fi-bit unsigned integer field, v.'hich represents the target UDP port number for the coiTesponding IP stream component. When used for RTP streams, the value of the targct_UDP_port_num field shall correspond to an even number. And, the next higher value shall represent the target UDP port number of the associated RTCP stream. The component_level_descriptor() represents zero or more descriptors providing additional information on the corresponding IP stream component. The viitual_channel_level_descriptor() represents zero or more descriptors providing additional information for the corresponding virtual channel. The ensemble_level_descriptor() represents zero or more descriptors providing additional infoiTTiation for the MH ensemble, which is described by the corresponding SMT. [159] FIG. 18 illustrates an exemplary bit stream syntax structure of an MH audio descriptor according to the present invention. When at least one audio service is prese nt as a component of the cuirent event, the MH_audio_descriptor() shall be used as a component_level_descriptor of the SMT. The MH_audio_descriptor() may be capable of informing the system of the audio language type and stereo mode status. If there is no audio service ass(x;iated with the current event, then it is preferable that the MH_audio_.descriptor() is considered to be insignificant (or absent) for the current event. Each field shown in the bit stream syntax of FIG. 18 will now be described in detail. [160] The descriptor_tag field is an 8-bit unsigned integer having a TBD value, which indicates that the corresponding descriptor is the MIT audio_descriptor(). The descriptor_length field is also an 8-bit unsigned integer, which indicates the length (in bytes) of the portion immediately following the descriptor_length field up to the end of the MH_audio_descriptor(). The channel_configuration field corresponds to an 8-bit field indicating the number and configuration of audio channels. The values ranging from ' 1' to '6' respectively indicate the the number and configuration of audio channels as given for "Default bit stream index number" in Table 42 of TSO/lEC 13818-7:2006. All other values indicate that the number and configuration of audio channels are undefined. [161] The sample_rate_code field is a 3-bit field, which indicates the sample rate of the encDded audio data. Herein, tlie indication may correspond to one specific sample rate, or may correspond to a set of values that include the sample rate (rf the encoded audio data as defined in Table A3.3 of ATSC A/52B. The bit_rate_code field cotrcsponds to a 6-bit field. Herein, among the 6 bits, the lower 5 bits indicate a nominal bit rate. More specifically, when the most significant bit (.V1.SB) is '0', the corresponding bit rate is exact. On the other hand, when the most significant bit (MSB) is T, the bit rate con^esponds to an upper limit as defined in Table A3.4 of ATSC A/53B. The lSO_639_language_code field is a 24-bit (i.e., 3-byte) field indicating the language used for the audio stream component, in conformance with ISO 639.2/'B [xj. When a specific language is not present in the corresponding audio stream component, the value of each byte will be set to '0x0(1'. [ 162] FIG. 19 illustrates an exemplary bit stream syntax stiiicture of an Mil RTP payioad type descriptor according to the present invention. The MH_RTP_payload_type_descriptor() specifies the RTP payioad type. Yet, the MH_RTP_payload_type_descriptor() exists only when the dynamic value of the RTP_payload_type field within the num_components kx)p of the SMT is in the range of '96' to '127'. The ]VlH_RTP_payload_type_descriptor() is used as a componentJeveLdescriptor of the SMT. The MH_RTP_payload_type_descriptor translates (or matches) a dynamic RTP_payIoad_type field value into (or with) a MIME type. Accordingly, the receiving system (or receiver) may collect (or gather) the encoding fomiat of the IP stream component, which is encapsulated in RTP. The fields included in the MH_RTP_payload_type_descriptor() will now be described in detail, f 163] The descriptor_tag field corresponds to an 8-bit unsigned integer having the value TBD, which identifies the current descriptor as the MH_RTP_payload._type _descriptor(). The descriptor_length field also coiTesponds to an 8-bit unsigned integer, which indicates the length (in bytes) of the portion immediately following the descriptor_length field up to the end of the MH_RTP_payload_type_descriptorO. The RTP_payload_type field corresponds to a 7-bit field, which identifies the encoding format of the IP stream component. Herein, the dynamic value of the RTP„payload_type field is in the range of '96' to '127'. The MIME_type_length field specifies the length (in bytes) of the MlME_type field. The MIME_type field indicates the MIME type corresponding to the encoding format of the IP stream component, which is described by the MH_RTP_payload_type_descriptor(). [ 164] FIG. 20 illustrates an exemplary bit stream syntax structure of an MH current event descriptor according to the present invention. The MH_current_event_descriptor() shall be used as the virtual_channel__leveLdescriptor() within the SMT. Herein, the MH_current_event_descriptor() provides basic infomiation on the cuirent event (e.g., the start time, duration, and title of the current event, etc.), which is transmitted via the respective virtual channel. The fields included in the MH_cuiTent_event_descript()r() will now be described in detail. [1651 The de.script()r_tag field corresponds to an 8-bit unsigned integer having the value TBD, which identifies the cunent descriptor as the MH_cuiTent_event_descriptor(). The descriptor_length field also couesponds to an 8-bit unsigned integer, which indicates the length (in bytes) of the portion immediately following the descriptor^ length field up to the end of the MH_ciuTent__event_de.scriptor(). The current_event_stajt_tLi'ne field corresponds to a 32-bit unsigned integer tiuantity. The cuiTcr>t_cvcnt_start_timc field rcprc;;cr.ts th.c start time of the current ovq'M a;id, more specifically, as the number of GPS seconds since 00:00:00 U TC, January 6, 1980. The current_event_duration field corresponds to a 24-bit field. Herein, the cun'ent_cvcnt_durution field indicates the duration of the current event in hours, minutes, and seconds (for example, wherein the fonnat is in 6 digits, 4-bit BCD - 24 bits). The title_length field specifies the length (in bytes) of the title_text field. Herein, the value '0' indicates that there are no titles existing for the con^esponding event. The title_text field indicates the title of the corresponding event in event title in the fonnat of a multiple string structure as defined in ATSC A/65C [xj. [ 166] FIG. 21 illustrates an exemplary bit stream syntax structure of an MH next event descriptor according to the present invention. The optional MH_next_event_descriptor() shall be used as the virtuaLchannel_level_desciiptor() within the SMT. Herein, the MH jext_event_descriptor() provides basic information on the next event (e.g., the start time, duration, and title of the next event, etc.), which is transmitted via the respective virtual channel. The fields included in the MH_next_event_descriptor() will now be described in detail. 1167] The descriptor_tag field corresponds to an 8-bit unsigned integer having the value TBD, which identifies the current descriptor as the MH_next_event_descriptor(). The descriptor_length field also corresponds to an 8-bit unsigned integer, which indicates the length (in bytes) of the portion immediately following the descriptor_length field up to the end of the MH_next_event_descriptor(). The next__event_start_time field coiTesponds to a 32-bit unsigned integer quantity. The next_event_start_time field represents the start time of the next event and, more specifically, as the number of GPS seconds since 00:00:00 UTC, Januaiy 6, 1980. The next_event_duration field conesponds to a 24-bit field. Herein, the next_event_duration field indicates the duration of the next event in hours, minutes, and seconds (for example, wherein the format is in 6 digits, 4-bit BCD - 24 bits). The titlejength field specifies the length (in bytes) of the title_text field. Herein, the value '0' indicates that there are no titles existing for the con"esponding event. The title_text field indicates the title of the cor- responding event in event title in the fonnat of a multiple string stnjcture as defined in ATSC A/65C[xl. [1681 FfCi. 22 illustrates an exemplary bit stream syntax structure of an MH system time descriptor according to the present invention. The MH_system_time_descriptor() shall be used as the ensemble_level_descriptor() within the SMT. Herein, the lVlH_system_time_descriptor() provides inFormation on current time and date. The MH_system_time_descriptor() also provides information on the time zone in which the transmitting system (or transmitter) transmitting the corresponding broadcast stream is located, while taking into consideration the mobile/portable characterstics of the MH service data. The liclds included in the Mll_systc;Ti__tiir,c_,dc;;criptor() v.'ill now be described in detail. 116yj The descriptor_tag field corresponds to an 8-bit unsigned integer having the value TBD, which identities the cunent descriptor as the Mll_system._time descriptorO. The descriptor_length field al.so corresponds to an 8-bit unsigned integer, which indicates the length (in bytes) of the portion immediately following the descrJptor_length field up to the end of the MH_system_time_descriptor(). The system_time field conesponds to a 32-bit unsigned integer quantity. The system_time field represents the current system time and, more specifically, as the number of GPS seconds since 00:00:00 UTC, January 6, 1980. The GPS_UTC_offset field corresponds to an 8-bit unsigned integer, which defines the current offset in whole seconds between GPS and UTC time standards. In order to convert GPS time to UTC time, the GPS_UTC_offsel is subtracted from GPS time. Whenever the International Bureau of Weights and Measures decides that the current offset is too far in error, an additional leap second may be added (or subtracted). Accordingly, the GPS_UTC_offset field value will reflect the change. [ 170] The time_zone_offset_polarity field is a 1-bit field, which indicates whether the time of the time zone, in which the broadcast station is located, exceeds (or leads or is faster) or falls behind (or lags or is slower) than the UTC time. When the value of the time_zone_offset_polarity field is equal to '0', this indicates that the time on the cunent time zone exceeds the UTC time. Therefore, the time_zone__offset_polarity field value is added to the UTC time value. Conversely, when the value of the time_zone_offset_polarity field is equal to '1', this indicates that the time on the cun'ent time zone falls behind the UTC time. Therefore, the time_zone_offset_polarity field value is subtracted from the UTC time value. [171] The time_zone_offset field is a 31 -bit unsigned integer quantity. More specifically, the time_zone_offset field represents, in GPS seconds, the time offset of the time zone in which the broadcast station is located, when compared to the UTC time. The daylight_savings field coiTesponds to a 16-bit field providing information on the Summer Time (i.e., the Daylight Savings Time). The time_zone field corresponds to a (5xS)-bit field iiidicaiing the time zone, in which the transmitting system (or transmitter) transmitting the corresponding broadcast stream is l(x.ated. [172] FIG. 23 illustrates segmentation and encapsulation processes of a service map table (SMT) according to the present invention. According to the present invention, the SMT is encapsulated to UDP, while including a target IF address and a target UDP poit number within the IP datagram. More specifically, the SMT is tlrst segmented into a predetermined number of sections, then encapsulated to a UDP header, and finally en- capsulated to an IP header. In addition, the S.MT section provides signaling in- funnatioii on all virtual cliannel included in the MM ensemble including the cor- responding SMT section. At least one SMT section describing the MH ensemble is included in each RS frame included in the corresponding MH ensemble. Finally, each SMT section is Identified by an cnsemble_id included in each section. According to the embodiment of the present invention, by informing the receiving system of the target IP address and target UDP pott nurnber, the con-esponding data (i.e., target IP address and tai-get UDP port number) may be parsed without having the receiving system to request for other additional inforaiation. [173] FIG. 24 illustrates a flow chart for accessing a virtual channel using FIC and SMT according to the present invention. More specifically, a physical channel is tuned (S5()l). And, when it is determined that an MH signal exists in the tuned physical channel (S502), the corresponding MH signal is demodulated (S503). Additionally, FIC segments are grouped from the demcxiulated MH signal in sub-frame units (S504 and S505). According to the embodiment of the present invention, an FIC segment is inserted in a data gaiup, so as to be transmitted. Mt)re specifically, the FIC segment coiTesponding to each data group described service information on the MH ensemble to which the corresponding data group belongs. [174] When the FIC segments aie grouped in sub-frame units and, then, deinterleaved, all service inforaiation on the physical channel through which the corresponding FIC segment is transmitted may be acquired. Therefore, after the tuning process, the receiving system may acquire channel information on the con-esponding physical channel during a sub-frame period. Once the FIC segments are grouped, in S504 and S505, a broadcast stream through which the corresponding FIC segment is being transmitted is identified (S506). For example, the broadcast stream may be identified by parsing the transport_stream_id field of the FIC body, which is configured by grouping the FIC segments. Furthermore, an ensemble identifier, a major channel number, a minor channel number, channel type infoimation, and so on, are extracted from the FIC body (S507). And, by using the extracted ensemble infoimation, only the slots coiTcsponding to the designated ensemble ai^e acquired by using the time-slicing method, so as to configure an ensemble (S508). 11751 Subsequently, the RS tVume corresponding tc; the designated ensemble is decuded (S509), and an IP s(Kket is opened for SMT reception (S510). According to the example given in the embodiment of the present invention, the SMT is encapsulated to UDP, while including a target IP address and a target UDP port number within the IP datagram. More specifically, the SMT is first segmented into a predetermined number of sections, then encapsulated to a UDP header, and finally encapsulated to an IP header. According to the embodiment of the present invention, by informing the receiving system of the target IP address and target UDP poil number, the receiving sysiein paises the SMT ftcctions and the dcscriptcn's of each SMT section v.'ithciit requesting for other additional information (S511). [176] The SMT section provides signaling information on all virtual channel included in the MH ensemble including the coiresponding SMT section. At least one SMT section describing the MH ensemble is included in each RS frame included in the cor- responding MH ensemble. Also, each SMT section is identified by an ensemble_id included in each section. Furthermore each SMT provides IP access information on each virtual channel subordinate to the corresponding MH ensemble including each SMT. Finally, the SMT provides IP stream component level information required for the servicing of the corresponding virtual channel. Therefore, by using the information parsed from the SMT, the IP stream component belonging to the virtual channel requested for reception may be accessed (S513). Accordingly, the service associated with the corresponding virtual channel is provided to the user (S514). [ 177] Hereinafter, a digital broadcast receiving system according to an embodiment of the present invention will be described in detail, based upon the desciiption of the present invention with reference to FIG. 1 to FIG. 24. Therefore, the description of FIG. 1 to FIG. 24 may be partially or entirely applied to the digital broadcast receiving system according to the embodiment of the present invention. Evidently, the scope of the appe nded claims and their equivalents will not depart from the description of the present invention. [178] FIG. 25 shows a protocol stack of an MH system according to one embodiment of the present invention. Hereinafter, with reference to FIG. 25, a brief description will be given of the protocol stack of the MH system according to one embodiment of the present invention. [179] According to one embodiment of the present invention, a definition is given of a technology relating to encryption or decryption of data requuing a conditional access before data of an IP level, RTF level and raw level are transmitted through an MH transport layer and physical layer. Also, a definition is given of a signaling method for implementation of the above technology (for example, a protocol established between an MH encryption/deciyption layer and an MH signaling layer, or the like). Further, a definition is given of a method of controlling a conditional access-applied service when being oiitputted to an external interface. 1180] The term "conditional access" is used throughout this specification. The "conditional access" con^esponds to a state in which mobile service data was encrypted (for example, scrambled) so that it can be used by only a specific user or specific digital broadcast receiver. For example, the "conditional access" may correspond to a ca.se where a conditional access function was set by a conditional access system (CA.S) or a control access system (CAS). I 1 o 11 Also, the term "control data" is used throughout this .specification. The "cop.trcl d:ita" corresponds to data required to remove the conditional access function of data to which the conditional access is applied. The "control data" may be named a "key value" and may be composed of, for example, an entitlement management message (EMM), en- titlement control message (ECM), or the like. Further, the ECM may include a control word (CW). f 182] FIG. 26 is a bl(x;k diagram showing the configuration of a digital broadcast receiver accoitling to one embodiment of the present invention. Hereinafter, a function of the digital broadcast receiver according to one embodiment of the present invention processing conditional access-applied mobile service data will be described with reference to FIG. 26. For reference, the digital broadcast receivers of RGs. 1 and 26 are similar in that they process a mobile digital broadcast, but the digital broadcast receiver of FIG. 26 is particularly characterized by that it can also process conditional access-applied mobile service data. Also, those skilled in the art will readily appreciate the operation of the digital broadcast receiver of FIG. 26 by refening to the entire de- scription of this specification. Further, the scope of the present invention is not limited to contents described in the drawings and should be in principle interpreted based on contents described in the appended claims. 1183] As shown in FIG. 26, the digital broadcast receiver according to one embodiment of the present invention, denoted by reference numeral 2600, includes a receiving module 2610, MH signaling DB 2620, user interface/controller 2630, MH TP/IP-based signaling decoder 2640, transport handler 2650, secure handler 2660, application decoder 2670, post processor/output module 2680, and so forth. For reference, in FIG. 26, a dotted line indicates the flow of data controlling each module, and a solid line indicates the flow of actual data being transmitted. [184] The receiving module 2610 includes a tuner 2611, operation controller 2612, VSB demodulator 2613, equalizer 2614, MH block decoder 2615, RS frame decoder 2616, known sequence detector 2617, and signaling decoder 2618. [185] The user interface/controller 2630 includes an application manager 2631 and a user interface 2632. The MH TP/IP-based signaling decoder 2640 includes an MH transport signaling decoder 2641 and an IP-based signaling decoder 2642. [ 186 j The transport tiandler 2650 includes an MH TP demux 2651, IP data handler 2652, UDP data handler 2653, file delivery handler 2654, stream delivery handler 2655, and MH encrypt/decrypt handler 2656. [187] The secure handler 2660 includes a smart card interface 2661, secure signaling DB 2662, copy protection handler 2663, and MH encrypt/decrypt handler 2656. For reference, an embedded secure processor may be used instead of the smart card interface 2661. 2672, video decoder 2673, and data decoder 2674. [189] The tuner 2611 of the digital broadcast receiver 2600 according to one embodiment of the present invention receives a broadcast signal into which mobile service data and main service data are multiplexed. Of course, a module taking charge of this function may be named a reception unit. [190] The RS frame dectxler 2616 extracts transmission parameter channel (TPC) signaling information and fast infonnation channel (FlC) signaling information from a data group in the received mobile service data. Of course, a module taking charge of this function may be named an extractor. Also, a separate FIC decoder may be additionally provided to extract the FIC signaling information. [191] The MH transport signaling decoder 2641 acquires a program table describing virtual channel information and a service of an ensemble, which is a virtual channel group of the received mobile service data, using the extracted fast information channel signaling information. Of course, a module taking charge of this function may be named an acquirer. [ 192J On the other hand, the program table may correspond to a service map table (SMT) that is a table about configuration information of the mobile service data, and this SMT may be configured, for example, as in FIG. 17 or FIG. 27. [ 193] The transport handler 2650 and/or secure handler 2660 detects a conditional access descriptor distinctively defining respective levels at which the mobile service data was encrypted, using the acquired program table. Of course, a module taking charge of this function may be named a detector. The conditional access descriptor will be described later in detail with reference to FIG. 28. [ 194] Also, the transport handler 2650 and/or secure handler 2660 controls such that the encrypted mobile service data is decrypted correspondingly to an encrypted level thereof, using information of the detected conditional access (CA) descriptor. Of course, a module taking charge of this function may be named a controller. [195] Therefore, according to one embodiment of the present invention, in an MH digital broadcasting environment, only a bix)adcast receiver authorized to use a conditional access-applied service (fur example, an encrypted service, scrambled senice, or the like) can use that service. Also, according to one embodiment of the present invention, a definite signaling method for implementation of such a technology is defined. [196J On the other hand, the above-stated data group may include, for example, a plurality of known data sequences, and the transmission parameter channel signaling in- formation and the fast information channel signaling infoimation may be designed to be placed, for example, between a first known data sequence and a second known data sequence, among the known data sequences. (Iv/ ] I iiei'Cii>rc, a Kiiovvii uata uotcctor or tiic Ciigital oroaocast receiver accoroiiig to one embodiment of the present invention may detect known data in the received broadcast signal, and an equalizer of the digital broadcast receiver according to this embodiment may channel-equalize mobile service data corresponding to the detected known data using the detected known data. For reference, the functions of the known data detector and equalizer were adequately described in the description of FIG. 1. [198] Moreover, according to this embodiment, the equalizer can improve equalization peifonnance by using a known data symbol sequence inputted from the known data detector. (199| Hereinafter, the operation of the broadcast receiver capable of processing the conditional access-applied service will be described in more detail with reference to FIG. 26. [200] The MH signaling DB 2620 is a database that stores MH signaling data received in non-fP or IP form and provides the stored data as needed. [2011 The MH transport signaling decoder 2641 processes non-IP MH signaling in- formation among MH signaling information, and the IP-based signaling decoder 2642 processes IP-based MH signaling information among the MH signaling information. [202] The MH TP demux 2651 processes an MH transport packet (TP) extracted from an RS frame, which is an output of the RS frame decoder 2616, and the IP data handler 2652 prcKesses an IP datagram to be delivered to an IP layer, in the MH TP. The UDP data handler 2653 processes a UDP datagram to be delivered to a UDP layer, in the IP datagram. [203] The file delivery handler 2654 processes a fde to be delivered to a file transfer protocol layer, in the UDP datagram. The stream delivery handler 2655 processes data to be delivered to an RTP layer (for example, a stream layer for real-time services), in the UDP datagram. [204] The application manager 2631 manages display of a service guide, and user input signals related to channel setup, etc. through the service guide. The application decoder 2670 manages middle ware and decodei-s for output of services in an MH broadcasting system. The post processor/output module 2680 is an interface that post-processes decoded services and outputs voi'ious data to an external device. [2051 fn particular, modules taking charge of main functions in connection with the present invention may be the MH encrypt/decrypt handler 2656, smart cai-d interface 2661, secure signaling DB 2662, copy protection handler 2663, etc., the functions of which will hereinafter be described in more detail. [206] The MH encrypt/decrypt handler 2656 controls such that services to which a conditional access is applied, among MH services, are encrypted and decrypted cone- spondingly to the levels of respective layers. r nn^ 1 'I'll 3-1 ......1 ,:...,..t:,. V r^'^ ^'A'^ ¦ • - i . t,.i, . ^ .1. . -^ .,.^ , 1 ..,, ,-^ ..¦..- i . ^ _.........- ,^-- I ^U / 1 liiC .>Ci^iiiC rti^uaiUig L/o ^y)0.^ i^ deciypt the conditional access-applied services, or high value services, among the MH services, and data required to securely process the corresponding services, and provides the stored data as needed. [2081 The smart card interface 2661 signifies a processor for processing data needed to be securely processed, and may be replaced by an embedded secure processor. [209] The copy protection handler 2663 functions to, for transmission of the high value services to an extemal interface, encrypt the high value services and process control data required for the encryption. [210] On the other hand, in order to implement a conditional access function, there is a need for various additional information such as information related to device and user authentication, infoimation about a reception authority level of the user, and a control word (may be referred to as, for example, a "key") which is used for encryption and decryption. 12111 In other words, the conti-ol data is composed of an entitlement management message (EMM), entitlement control message (ECM), or the like, and the ECM includes a contiol word. This control data may be tiansmitted in an electronic service guide (ESG) or may be transmitted in other ways. [212J The digital broadcast receiver 2600 receiving the control data stores the control data in the MH signaling DB 2620 or the secure signaling DB 2662, which is a separate secure storage space, fn some cases, the digital broadcast receiver 2600 may receive and use the control data in real time. [213] Accordingly, in the case where an authorized digital broadcast receiver intends to use a conditional access-applied service, it may extract control data con-esponding to the service from the MH signaling DB 2620 or secure signaling DB 2662 or may extract the control data corresponding to the service in real time. [214] Also, the extracted control data is delivered to the MH encrypt/decrypt handler 2656, which then removes the conditional access function of the coiresponding service using the delivered control data. [215] On the other hand, a packet level structure of an MH enciypted physical layer will hereinafter be described briefly with reference to FIG. 2. [216] fn the case where the conditional access is applied, an enciypted MH service, a control word required to decrypt the encrypted MH service, and other control data required for the conditional access are transmitted to a digital broadcast receiver side through an MH payload area shown in FIG. 2. That is, the conditional access-applied MH service is transmitted through the MH payload area after being encrypted, and the control data for setting and release of the conditional access function is also transmitted through the MH payload ai'ea. [^1 /) iicrciiiditcr, a uCtaiiCu ocscription wiil oc givcii Oi coiicrctc oata or signaling mctnod required to process a conditional access-applied senice in an MH digital broadcasting environment. [2181 FIG. 27 shows another embodiment of a bit stream syntax of a service map table (referred to hereinafter as an "SMT") according to one embcxliment of the present invention, and FIG. 28 shows the syntax of a conditional access descriptor according to one embodiment of the present invention. Hereinafter, with reference to FIGs. 27 and 28 (and FIG. 17 a.s a subsidiary), an illustrative description will be given of a table and descriptor required to implement the conditional access function. [2I9| According to one embodiment of the present invention, an SMT (for example, shown in FIG. 17 or 27) indicative of the structures of MH services is transmitted. The SMT defines various information required in a piTxress of processing MH services carried through an RS frame. For example, the MH transport signaling decoder 2641 in FIG. 26 may process the SMT. TTiis SMT is designable to notify information about conditional access-applied services, among MH services carried through the cor- responding RS frame. In particular, the SMT delivers control data required for processing of the conditional access function to a digital broadcast receiver side through the conditional access descriptor illustrated in FIG. 28. Of course, the control data may be transmitted to the digital broadcast receiver side thixjugh an ESG. [220J The S.MT of FIG. 27 can be understood with reference to the SMT of FIG. 17, and a supplementary description will hereinafter be given centering around some other fields. [221 ] In FIG. 27, a "service__provider_id" field indicates information identifying a seiTice provider, a "number_of_ensemble" field indicates the number of ensembles carried through this table, a "physical_freq_idx" field indicates the index of a physical frequen cy at which a specific ensemble is transmitted, an "en.semble_id" field indicates in- formation identifying at lea.st one ensemble, a "number_of_service" field indicates the number of services belonging to a specific ensemble, and a "number_of_target_IP_address" field indicates the number of target IP addresses belonging to a specific service. The remaining fields shown in FIG. 27 will be readily understood thruugh the field description of FIG. 17. [2221 Also, infonnation required to access a conditional access-applied service can be par- ticularly included in the descriptor of FIG. 28, which may be named a conditional access descriptor for convenience. It should be noted here that this name is nothing but one example. Also, for the convenience of description, the term "MH CA descriptor" may replace the conditional access descriptor. [223] The conditional access descriptor shown in FIG. 28 includes information identifying each level at which mobile service data v.'as encrypted, and information about control data which is used foi" uccryption of tlic encrypted iiiobilc service data. (224) In more detail, as shown in FIG. 28, a "descriptor_tag" Field indicates that this descriptor is an Ml I CA descriptor, a "descriptor_length" field indicates a length (expressed by, for example, bytes) from this field to a last Held of this descriptor, a "CA _System_lD" field indicates the type of a CA system associated with an ECM or EMM, an "ECM_EMM_tlag" field indicates whether the current MH_CA_ Descriptor is a descriptor of the ECM or a descriptor of the EMM. For example, the "ECM„EMM_flag" field signifies that the MH_CA_Descriptor is the descriptor of the ECM when the value thereof is '0', and that the MH_CA_Descriptor is the descriptor of the EMM when the value thereof is T. Of course, these numerical values are nothing but examples. [225] An "encrypt_level_tlag" field corresponds to information identifying each level at which mobile service data was encrypted or the conditional access was applied. For example, this field indicates "No Encryption" when it has a value '000', "IP Level Encryption" when '001', "RTP(Stream) Level Encryption" when '010', "Raw Level Encryption" when '011', and "reserved" when 'others'. [226] An "IF_flag" field indicates whether infomiation of a "destination_IP_address" field is present in the current MH_CA_Descriptor. For example, when the "IP_flag" field has a value '0', it indicates that infonnation of an "IP_version_fiag" field and the in- formation of the "destination_IP_address" field ai^e not present. In this case, the ECM or EMM is transmitted to a digital broadcast receiver side using the same IP address as "destination_IP_address" of the corresponding service and a port number different from "destinatJon_port_niimber" of the coiresponding service. ]2271 In contrast, when the "IP_flag" field has a value ' 1', it indicates that the information of the "IP_version_flag" field and the information of the "destination_IP_address" field are present. [228] The "IP_version_flag" field indicates the version of the "destination._.IP_address". For example, the "IP_version_flag" field indicates that an IPv4 address has been used when the value thereof is '0', and that an IPv6 address has been used when the value thereof is '1'. [229| The "de.stination_IP_addie.ss" field indicates a destination IP address of an IP datagram in which the ECM or EMM is canied. A "destination._port_number" field indicates a destination port number of a UDP datagram in which the ECM or EMM is earned, and a "private_data_byte" field indicates data individually defined by a conditional access system (CAS). [230] The conditional access descriptor MH_CA_Descriptor defined in this manner may coirespond to a descriptor in the SMT shown in FIG. 17 or 27. For detailed example, the conditional access descriptor may be defined as any one of a component level descriptor, vinLial cliannel level ucscriptcr or criscmblc level descriptor of the SMT shown in FIG. 17 or as any one of a service provider descriptor, ensemble de.scriptor, service descriptor or tai"get IP address descriptor of the SMT shown in FIG. 27. [231 ] In the case where the conditional access descriptor is defined as the service provider descriptor of the SMT, the conditional access function operates with respect to all data corresponding to a specific service provider. On the other hand, in the case where the conditional access descriptor is defined as the ensemble descriptor of the SMT, the conditional access function operates with respect to all data con-esponding to a specific ensemble. [232] Also, in the case where the conditional access descriptor is defined as the service descriptor of the SMT, the conditional access function operates with respect to all data corresponding to a specific seiTice. Of course, this service may correspond to a virtual channel. Al.so, in the case where the conditional access descriptor is defined as the target IP address descriptor of the SMT, the conditional access function operates with respect to all data con-esponding to a specific target IP address. [233] FIG. 29 shows the structure of an RS frame according to one embodiment of the present invention, and FIG. 30 shows an MH TP format according to one embodiment of the present invention. Hereinafter, with reference to FIGs. 29 and 30, a description will be given of a packet level structure of an MH encrypted transport layer according to one embodiment of the present invention. [234J For reference, FIGs. 3 and 29 show RS frame structui^s, in which FIG. 3 shows an example of the stnicture of an RS frame including no conditional access-applied data and FIG. 29 shows an example of the stiiictiire of an RS frame including conditional access-applied data. [235] FIG. 29 shows the format of an RS frame that carries data coiresponding to an MH ensemble conesponding to each MH frame, which may be an output of an MH physical layer subsystem. As shown in FIG. 29, one RS frame can carry a plurality of MH .services, each of which includes a plurality of IP datagrams. Also, the RS frame is composed of a two dimensional byte airay of 187*N bytes, and each row of the RS frame constitutes an MH transpoil packet in view of an MH transport layer. [236| On the other hand, one MH TP has a format including an MH TP header ol"2 bytes and an MM TP payload of (N-2) bytes, which is ilhistrated in I'lG. 30. When stuffing bytes arc k bytes long, the MH TP header may be (N-2-k) bytes long. [237 j In FIG. 30, a "type indicator" field indicates the data type of payload data. The "type indicator" field signifies that the MH 'I'P cames signaling data when the value thereof is '000', and that the MH TP cairies an IP datagram when the value thereof is '001'. [238] An "error indicator" field indicates whether there is an enor detected in this MH TP, a "stuff indicator" field indicates whether there are stuffing bytes included in this MH TP. a '"pointer field" field indicates a start point (when there is stuffing of k bytes in the MH TP). [2.391 TTCi. 31 shows the structure of data encrypted at an IP level, according to one embodiment of the present invention, FIG. 32 shows the structure of data encrypted at an RTF level, according to one embodiment of the present invention, and FIG. 33 shows the stioicture of data encrypted at a raw level, according to one embodiment of the present invention. Hereinafter, with reference to FIGs. 31 to 33, a description will be given of processes of peiforming encryption and deciyption at the respective levels. |240j Data in an IP datagram, such as video, audio, timed text, etc., is transmitted through a layer for a real-time application, such as Real-time Transport Protocol (RTP). For example, the video, audio and timed text data are delivered to an MH TP layer through the stream delivery handler 2655, UDP data handler 2653 and IP data handler 2652 shown in FIG. 26. 1241] FIG. 31 illustrates a method of packetizing real-time application data into an MH TP after applying a conditional access to the data (for example, encrypting the data) at the IP level. [242] First, with reference to FIG. 31, etc., a description will given of a process of encrypting mobile service data at the IF level by a digital broadcast transmitter or the like. [243] Real-time application data of an MH .service delivered through an RTP layer is packetized into an MH TP via a UDP layer and IP layer. At this time, in the case where the conditional access is applied to the MH seivice at the IP level, an IF datagram, which is an output of the IP layer, is first encrypted at an MH encrypt/deciypt layer before being packetized into an MH TP. The IP datagram encrypted in this manner is packetized into an MH TP at the MH TP layer and then transmitted to a physical layer. [244] Next, with reference to FIG. 31, etc., a description will given of a process of decrypting mobile service data encrypted at the IP level by a digital broadcast receiver or the like, [245] The digital broadcast receiver detennines whether the conditional access was applied to a given MH service, using tiie conditional access descriptor (see FKi. 28) included in the SMT (see FIG. 17 or 27). In particular, in the case where the "enciyptJeveLtlag" value is '001', the digital broadcast receiver peiforms deci-yption at the IP level. For the decryption at the IP level by the digital broadcast receiver, the MH TP demux 2651 extracts the given MH service and control data (for example, an ECM, EMM, or the like) from an RS frame, and the MH encrypt/decrypt handler 2656 decrypts the enciypted MH service using the control data processed by the secure handier 2660. Then, the IP data handler 2652 receives the dcciypted MH service, and ihe uiher iiuidules of the digital broadcast icceivcr coiitrol SLicii that the Mil .service is noiTnally (jutputted. Of course, the encryption process may be performed in the reverse order of the above-stated decryption process. [246] FIG. 32 illustrates a method of packetizing real-time application data into an Mil TP after applying a conditional access to the data (for example, encrypting the data) at the RTP (stream) level. [247J First, with reference to FIG. 32, etc., a description will given of a process of enciypting mobile service data at the RTP level by a digital broadcast transmitter or the like. 1248] In the case where the conditional access is applied to real-time application data of an MH service at the RTP (stream) level, RTP (stream) data, which is an output of the RTP layer, is encrypted at the MH encrypt/decrypt layer. The encrypted data is packetized into an MH TP at the MH TP layer via the UDP layer and IP layer and then transmitted to the physical layer. 12491 Of course, in the case where the conditional access is not applied, the RTP (stream) data, which is the output of the RTP layer, bypasses the MFI encrypt/decrypt layer. The RTP data, not encrypted, is packetized into an MH TP at the MH TP layer via the UDP layer and IP layer and then ti-ansmitted to the physical layer. [250] Next, with reference to FIG. 32, etc., a description will given of a process of decrypting mobile service data encrypted at the RTP level by a digital broadcast receiver or the like. [251J The digital broadcast receiver determines whether the conditional access was applied to a given MH service, using the conditional access descriptor (see FIG. 28) included in the SMT (see FIG. 17 or 27). In particular, in the case where the "enciypt_]evel_nag" value is '010', the digital broadcast receiver peiforms decryption at the RTP level. For the decryption at the RTP level by the digital broadcast receiver, the MH TP demux 2651 extracts the given MH seI^'ice and control data (for example, an ECM, EMM, or the like) from an RS frame, and the enciypted MH service is delivered to the MH encrypt/deciypt handler 2656 through the IP data handler 2652 and UDP data handler 2653. The MH enciypt/decrypt handler 2656 decrypts the eiici-ypted MH service using the control data processed by the secure handler 2660. Then, the stream delivery handler 2655 receives the deciypted MH service, and the other modules of the digital broadcast receiver control such that the MH service is normally outputted. Of course, the encryption process may be performed in the reverse order of the above-stated decryption process. [2521 FIG. 33 illustrates a method of packetizing real-time application data into an MH TP after applying a conditional access to the data (for example, encrypting the data) at the raw lev'el. l^D^l liicii, Willi iCiCiuiin^ lu i ivJ. J J, i-l*-., a ij*j.-)v„i ipuvMl vv Hi 31 v^.ii ol a pn./v.*_SS ^-il encrypting mobile sen'ice data at the raw level by a digital broadcast transmitter or the like. [254] In the case where the conditional access is applied at the raw level, raw data of a real- time application of an MH service is encrypted at the MH enciypt/decrypt layer before being encapsulated at the RTF layer. The encrypted data is packetized into an MH TP at the MH TP layer via the RTP layer, UDP layer and IP layer and then transmitted to the physical layer. [255] Of course, in the case where the conditional access is not applied, the raw data, which is an output of an application layer, bypasses the MH encrypt/decrypt layer, and is packetized into an MH TP at the MH TP layer via the RTP layer, UDP layer and IP layer and then transmitted to the physical layer. [256] Next, with reference to FIG. 33, etc., a description will given of a process of decrypting mobile service data encrypted at the raw level by a digital broadcast receiver or the like. [257] The digital broadcast receiver determines whether the conditional access was applied to a given MH service, using the conditional access descriptor (see FIG. 28) included in the SMT (sec FIG. 17 or 27). Li particulai-, in the case where the "encrypt_level_flag" value is 'Oil', the digital broadcast receiver performs decryption at the raw level. For the decryption at the raw level by the digital broadcast receiver, the MH TP demux 2651 extracts the given MH service and control data (for example, an ECM, EMM, or the like) from an RS frame, and the encrypted MH service is delivered to the MH encrypt/decrypt handler 2656 through the IP data handler 2652, UDP data handler 2653 and stream deliveiy handler 2655. The MH encrypt/decrypt handler 2656 decrypts the encrypted MH service using the control data processed by the secure handler 2660. Then, the application decoder 2670 receives the decrypted MH service, and the other modules of the digital broadcast receiver control such that the MH service is normally outputted. Of course, the encryption process may be performed in the reverse order of the above-stated decryption process. [258] FIG. 34 illustrates an AES-CTR mode encryption process which is applicable to one embodiment of the present invention, TIG. 35 illustrates an AES-CTR mode decryption prcKess which is applicable to one embodiment of the present invention, FIG. 36 is a table defining an AES-CTR mode counter value which is applicable to one embodiment of the present invention, and FIG. 37 illustrates a process of processing a residue block in an AES-CTR mode enciyption/decryption process which is applicable to one embodiment of the present invention. Hereinafter, with reference to FIGs. 34 to 37, a description will be given of a concrete encryption/decryption method for imple- mentation (jf a conditional access function acct)rding to one embodiment of the present invciition. 1259) For example, ,^dvanced Encryption Standard (AES)-Coun'reR (CTR)-128 may be used as an encryption/decryption algorithm which is applied to an MH service for the conditional access thereof. In this case, enciyption may be performed at the IP level, RTF level and raw level, as shown in FIG. 34, and deciyption may be reversely performed at the IP level, RTP level and raw level, a.s shown in FIG. 35. [260] Notably, in the case of using the AES-CTR-128 algorithm shown as in FIGs. 34 and 35, an initial counter value is required, and the present invention nevk'ly defines the counter value as in FIG. 36. 12611 In FIG. 36, a "type indicator" field indicates the type of an encrypted stream, a "system time" field indicates a system time of a superframe, and a "destination port number" field indicates a destination port number of an encrypted stream. The use of the counter value defined in this manner makes it possible to uniquely define a counter value of each data block composed of 16 bytes. It is also possible to increase efficiency. [262J Also, the "type indicator" field shown in FIG. 36 may be designed to correspond to the "type indicator" field of the MH TP shown in FIG. 30. In the case of being designed like this, the "type indicatoi^' field in FIG. 36 signifies that an MH TP of an encrypted stream cairies signaling data when the value thereof is '000', and that an MH TP of an encrypted stream carries an IP datagram when the value thereof is '001'. [263] Therefore, according to one embcxliment of the present invention, as a counter value to be used in an encryption/decryption algorithm (for example, the AES-CTR-128 algorithm or the like), different counter values can be set according to an MH TP canying signaling data and an MH TP carrying an IP datagram, paiticularly by using the type indicator of each MH TP. Further, there is an advantage that the encryption/ decryption algorithm is designable to operate depending on MH TPs having such different counter values. [264] On the other hand, data to be encrypted and decrypted according to one embodiment of the present invention is partitioned into 128-bit blocks and then encrypted and decrypted. As a result, the last data block may not be up to 128 bits. For preparation for Ihis case, a design may be made to XOR an oiilput value From an AES encryption block and the value of a residue data block beginning with most significant bits, as shown in FTC 37. [2651 FIG. 38 is a detailed view of an SMT including a conditional access descriptor according to one embodiment of the present invention, and FIG. 39 sht)Ws the structure of an RS frame including an MH service to which a conditional access is applied, according to one embodiment of the present invention. Hereinafter, in conjunction with FIGs. 38 and 39, an illustrative description will be given of a process of processing a coiiuiLi<. ucccss-appiicd soi iii a nigouc ijigital broagcasting ciiviroiiiiicrit.> 12661 Each MH_CA_Descriptor shown in FIG. 38 indicates a level at which the conditional access is applied, control data required in a decryption process, and so forth. The MII_CA_Descriptor_l provides information about a conditional access- applied ECM with respect to only a service whose target TP address is 200.200.200.5, among services whose ensemble ID is 1 and major channel number and minor channel number are 30-5. [267] The MH_CA_Desciiptor_2 provides infc^rmation about a conditional access-applied ECM with respect to all seiTices whose ensemble ID is 1 and major channel number and minor channel number are 30-6. That is, the MH_CA_Descriptor_2 provides the information about the conditional access-applied ECM with respect to services whose target IP addresses are 200.200.200.6 and 200.200.200.7. [268] On the other hand, as stated previously, a digital broadcast receiver according to one embodiment of the present invention can determine whether the conditional access- applied service was encrypted at which one of the raw level, RTP level and IP level, by using "encrypt_level_flag" of the MH_C A_Descriptor. At this time, the digital broadcast receiver needs control data for authorization of access to conditional access- applied services, and so forth. That is, the digital broadcast receiver can acquire EMM information for authorization of reception of all services whose ensemble ID is '1', using the fact that the value of ECM_EMM_tlag of the MH„CA_Descriptor_3 is ' 1'. [269J FIG. 39 shows the structure of an RS frame including seiTices in which the ensemble ID is '1' and the conditional access is applied, in the SMT shown in FIG. 38. [270] In the case where a service 2 is selected in the RS frame structure of FIG. 39, a digital broadcast receiver according to one embodiment of the present invention can confirm that MH_CA_Descriptor associated with the service 2 is present in the SMT of FIG. 38. That is, the digital broadcast receiver can confimi that the conditional access was applied to the service 2. [271 ] At this time, the digital broadcast receiver can confiim from the MH_CA_Descriptor_2 associated with the service 2 that an ECM (including a control word, etc.) requii-ed for removal of the conditional access function of the service 2 is transmitted thi\)iigh a destination IP address '200.200.200.9' and a destination port number '1000'. Also, the digital broadcast receiver can confinn that an E.MM. among control data required for authorization of access to the enciypted service 2, is transmitted through a destination IP address '200.200.200.10' and a destination port number '1000'. Therefore, using the confiixncd ECM, EMM, etc., the digital broadcast receiver can remove the conditional access function of the encrypted sewice 2. [272] FIG. 40 is a flowchart illustrating a control method of a digital broadcast receiver acc(irding to one embodiment of the present invention. With reference to FIG. 40, a brief description v,ill hereinafter be given of the control method of the digital broadcast receiver according to one embtxliment of the present invention. For reference, FIGs. 40 and 45 relate to a method invention, which can be interpreted with the description of the above stated object invention supplementarily applied thereto. [2731 The digital broadcast receiver according to one embodiment of the present invention decodes an RS frame (S4000). The digital broadcast receiver extracts an SMT a.s a result of the decoding (84001) and pai^se.s the extracted SMT to check information required for removal of a conditional access function (S4002). 1274) ITie digital broadcast receiver extracts MH TPs according to the SMT to extract control data, etc. (S4003). The digital broadcast receiver parses an MH TP header (S4004) to determine the value of a "Type_Indicator" field (S4005). When it is determined at step S4005 that the field value is '000', the digital broadcast receiver processes signaling data (S4017). When it is determined at step S4005 that the field value is '001', the digital broadcast receiver determines the value of an 'encrypt__level_flag' field of a conditional access descriptor (corresponding to MH__CA.. Descriptor shown in FIG. 28) of the SMT (S4006). [2751 When it is determined at step S4006 that the value of the 'encryptJeveLflag' field is "00r, the digital broadcast receiver decrypts encrypted mobile service data at an IP level (S4007). That is, the digital broadcast receiver decrypts an IP datagram. [276] In the case where it is determined at step S4006 that the value of the 'encrypt_level_flag' field is not '001', the digital broadcast receiver proces.ses an IP datagram (S4008) and processes a UDP datagram (S4009). Also, the digital broadcast receiver determines whether data transmitted from a digital broadcast transmitter or the like is a file or stream (S4010). When it is determined at step 4010 that the transmitted data is the stream, the digital broadcast receiver determines the value of the 'encrypt_level_flag' field (S40I2). In contrast, when it is determined at step 4010 that the transmitted data is the file, the digital broadcast receiver processes the file (S4011). [277J In the case where it is determined at step S4012 that the value of the 'encrypt_level_flag' field is '010', the digital broadcast receiver decrypts encrypted mobile service data at an RTP level (S40I3). That is, the digital broadcast receiver deciypts stream data. [278] In the case where it is determined at step S40I2 that the value of the ¦encrypt_level_flag' field is not '010', the digital broadcast receiver processes the stream (S4014) and detennines the value of the 'encrypt_level_flag' field (S4016). When it is determined at step S4016 that the value of the 'encrypt_level_flag' field is 'Oir, the digital broadcast receiver deci-ypts encrypted mobile service data at a raw level (S4015). That is, the digital broadcast receiver deci-ypts raw data. [279] hi contrast, when it is dctennincd at step .S4016 that the value of the an application is prcKesscd suitably to a corresponding format (S4018). This forniat may be, for example, a file, stream, signaling data, or the like. [280j The present method may be designed such that the step S4010 of detenrsining whether the transmitted data is the file or stream or the step S4011 is deleted and the step S4012 is performed immediately subsequently to the step S4009. [281] FIG. 41 is a table defining copy control infomiation (CCI) according to one embodiment of the present invention, FIG. 42 illustrates an encryption mode indicator (EMI) shown in FIG. 41, FIG. 43 illustrates an analog protection system (APS) shown in FIG. 41, and FIG. 44 illustrates a constrained image trigger (CIT) shown in FIG. 41. Hereinafter, with reference to FIGs. 41 to 44, a description will be given of a method capable of securely setting copy protection when a conditional access-applied MH service is transmitted to an external interface, according to one embodiment of the present invention. [2821 As stated previously, a conditional access-applied MH service is transmitted to digital broadcast receivers, and only an authorized user or digital broadcast receiver can use the MH service. Notably, in order to prevent an illegal copy from occurring when the MH service is transmitted through an external interface, one emb(xliment of the present invention defines new signaling data. [28.?] The signaling data for the illegal copy prevention may be illustrated as in FIG. 41. For example, this signaling data may be copy control information (CCI) composed of 8 bits. [284] On the other hand, an encryption mode indicator (EMI), among CCI fields shown in FIG. 41, may be configured as in FIG. 42. This EMI is information for copy control of digital data, which is used to control a copy authority of a digital data output. [285] Also, an analog protection system (APS), among the CCI fields shown in FIG. 41, may be configured as in FIG. 43. This APS is used to control a copy authority of an analog data output. [286] Also, a constrained image trigger (CIT), among the CCI fields shown in FIG. 41, may be configured as in FIG. 44. This CIT is used to control a copy authority of an image i)f a high definition analog component t)ulpiit. [287 j The CCl may be transmitted under the condition of being not encrypted, but a digital broadcast receiver has to confirm whether the transmitted CCI is legal data transmitted from a service provider. Therefore, according to one embodiment of the present invention, the CCI may be transmitted in an ECM or a descriptor of an SMT or using a secure scheme such as public key infrastructure (PKl). (2881 For example, according to one embodiment of the present invention, an EMI defining a copy authority of a digital data output, an APS defining a copy authority of an analog data output, and a CIT defining a copy authority of a high definition analog component data output may be additionally defined in the conditional access descriptor shown in FIG. 28. [289J In this case, when a service with CCI is outputted to a variety of estemul interfaces such as IEFE-1394, USB, DVI, HDMI and component (RGB, YPbPr), the copy protection handler 2663 can output a stream or service with a copy authority set therein to the external interfaces according to the type of data using the CCI (for example, defined as a conditional access descriptor). For reference, the copy protection handler 2663 may be named a transmission unit. [290] Also, the CCI may be stored in the secure signaling DB 2662 or other storages, and a digital broadcast receiver according to one embodiment of the present invention may use the stored CCI to output a service tn an external interface. [291J FIG. 45 is a flowchart illustrating a control method of a digital broadcast receiver and digital broadcast transmitter according to one embodiment of the present invention. With reference to FIG. 45, a detailed description will hereinafter be given of the control method of the digital broadcast receiver and digital broadcast transmitter according to one embodiment of the present invention. [292] The digital broadcast transmitter according to one embodiment of the present invention generates a broadcast signal including a conditional access descriptor indicating whether mobile service data was encrypted (S4501) and transmits the generated broadcast signal including the conditional access descriptor to a digital broadcast receiver (S4502). [293] Here, the conditional access descriptor includes information identifying each level at which the mobile service data was encrypted, and information about control data which is u.sed for decryption of the encrypted mobile service data. Also, the conditional access descriptor may be configured as in FIG. 28, and may be referred to as MH_CA_Descriptor. [294] The digital broadcast receiver according to one embodiment of the present invention receives a broadcast signal into which mobile service data and main service data are multiplexed (S4503) and extracts TPC/FIC signaling infomiation from a data group in the received mobile service data (S4504). 1295] Also, the digital broadcast receiver acquires a program table describing virtual channel infoiTnation and a service of an ensemble, which is a virtual channel group of the received mobile service data, using the extracted FFC signaling information (S4505J. Then, the digital broadcast receiver detects a conditional access descriptor indicating whether the mobile service data was encrypted, using the acquired pn)gram table (S45()6). For detailed example, the conditional access descriptor may be a descriptor distinctively defining respective levels at which the mobile sen-ice data was CiiCi*V piCu. (2961 Then, the digital broadcast receiver controls such that the encrypted mobile service data is decrypted, using information of the detected conditional access descriptor (S4507). For detailed example, at step S4507, the digital broadcast receiver may control such that the enciypted mobile service data is decrypted coirespondingly to an encrypted level thereof. L297] For reference, the program table may con-espond to the SMT shown in FIG. 17 or 27, and the conditional access descriptor may correspond to the MH_CA_Descriptor shown in FIG. 28. [2981 In this regard, the step S4507 may further include determining a level at which the mobile service data was enci^pted, using, for example, the MH_CA_Descriptor of the SMT, and decrypting the enciypted mobile service data at a level corresponding to the determination result using the infomiation about the control data. [299] As described above, according to one embodiment of the present invention, it is possible to readily decrypt mobile service data encrypted, for example, at a raw level, RTF level and IP level iirespective of the positions of the levels in a mobile digital broadcasting environment. [300] Further, according to one embodiment of the present invention, mobile service data requiring no conditional access is designed to bypass an MH encrypt/decrypt layer, thereby enabling compatibility with existing systems. [301 ] In addition, according to one embodiment of the present invention, an illegal copy can be prevented even when mobile service data is outputted to an external interface. [302] The present method invention can be implemented in the form of program commands executable by a variety of computer means, and recorded on a computer-readable recording medium. The computer-readable recording medium can include program commands, data tiles, data structures, etc. individually or in combination. The program commands recorded on the medium may be ones specially designed and configured for the present invention or ones known and available to those skilled in computer software. Examples of the computer-readable recording medium include magnetic media such as a hard disk, a floppy disk and a magnetic tape, optical media such as a compact disc read only memoi-y (CD-ROM) and a digital versatile disc (DVD), maBneto-optical media such as a floptical disk, and hardware devices specially configured to store and execute program commands, such as a ROM, a random access memory (RAM) and a flash memoiy. Examples of the program commands include high-level language codes that can be executed by a computer using an interpreter, etc., as well as machine language codes such as those produced by a compiler. The above- stated hardware devices can be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa. |303| Although the present invention has been described in conjuPiCtior, v.'ith the limited embcxJiments and drawings, the present invention is not limited therctt). 'fTiosc skilled in the art will appreciate that various modifications, additions and substitutions are possible from this description. [304] Therefore, the scope of the present invention should not be limited to the description of the exemplai-y embodiments and should be determined by the appended claims and their equivalents. Mode for the Invention [305 j A mode for invention is de.scripbcd in above "Best Mode". Industrial Applicability f3061 As described above, the present invention can be applied to a digital broadcasting system. [Claim 121 (Canceled) [Claim 131 (Canceled) [Claim 141 (Canceled) [Cliiim IT)] (Added) A method of processing data for a receiver, the method comprising: receiving a broadcast sinna! corr.pnsinK last information channel (FlC) data including croKS layer information for mobile service acquisition, transmission parameter channel (TPC) data including I'lC version information for identifying an update of the FIC data, a desired Reed-Solcmon (RS) frame including mobile service data; demodulating the broadcast signal; forming an ensemble from the KS frame included in the demodulated broadcast sifinal and acquiring a service map table (SMT) from the ensemble, the SMT including access iiiforniation and encryption information of a mobile service; and decrypting mobile service data included in the ensemble in accordance with the access information and the encryption of the mobile service. [Claim 161 (Added) The method of claim 15. wherein the S.Vl T includes at least one of an ensemble level descriptor including ensemble level information, a service level descriptor including mobile service level information, and a component level descriptor including component level information. [Claim 17] (Added) The method of claim IG. wherein the encryption information of the mobile service i.s included in at least one of the service level descriptor and the component level descriptor. [Claim 181 (.Added) The method of claim 17, wherein the encryption information comprises type information of a system managing a key used for encryption of the mobile service. [Claim 19] (.'\ddcd) The method of claim 17, wherein the encryption information comprises informntion ideiitifyinK encryption of the mobile scrvici?. [Claim 20] (Added) The method of i:laim 15. wherein t)i SMT further inrhidps IK nccess iriformatiuii for t'-.cC(;ssiiiH to IF datngi .iiii of key iiifoi riialioii luiod for L':n:i"ypiloii of the mobile service. [Clnim 21] (Added; The method of claim IS, further compri.siriK decoding at least one. of audio and video streams included in 11' datagram of the decrypted mobile service data. (Claim 22] (Added) The method of claim lf>. further comprising detecting a plurality of known data sequences from the broadcast siRnal. fClaim 23] (Added) The method of claim 22. further comprising channel-equalizing data included in the demodulated RS frame using the detected knoxn data sequences. [Claim 241 (Added) The method of claim 15, wherein receiving the broadcast signal comprises receiving slots corresponding to the desired RS frame using a time-slicing method. [Claim ?.5\ (Added) A receiver comprising: a receiving unit for receiving a broadcast signal comprising fsst information channel (FIC) data including cross layer informalion for mobile service acquisition, trans.iiission parameter channel (TI'C) data inclcdinK FIC version information for identifying an update of the FIC data, a desired Reed-Solomon (RS) frame including mobile service data; a demodulator for demodulating the bro?.dcast signal; a first handler for forming an ensemble from the KS frame included in the demodulated bi'oadcast signal and acquiring a service map table (SMT) from the ensemble, the SMT including access informntion and encryption information of a mobile service, and a second h;md!cr for decrypting mobile service data included in the ensemble in accordance- with the access ii.fonnation and tiie encryption of the mobile service. [Claim 26] (Added) I'hff receiver of claim 25, wherein the SMT inchidcs at least one of an ensemble level descriptor mcludi[:g ensemble level information, a service level descriptor including mobile service level information, and a c:omponent level descriptor including cornponenl level iiiforrnation. [Claim 27] (Added) The receiver of claim 2B, wherein t;ie encrvption information of the mobile service in included in at least one of the service level descriptor and the component level descriptor. [Claim 28] (Added) The receiver of claim 27. wherein the encryption information comprises type information of a system managing a key used for encryption of the mobile service. [Claim 291 (Added) The receiver of claim 27. wherein the encryption information comprises information identifying encryption of the mobile .service. [Claim 30] (Added) The receiver of claim 25, wherein the SMT further includes IP access information for accessing to IF data^iram of key information used for encryption of the mobile service. [Claim :M] (Added) The receiver of claim 25, further comprising a decoder for decoding at least one of audio and video stream.s included in IP datagram of the decrypted mobile service data. [Claim 32] (Added) The receiver of claim 25, further coiiiprising a l [Claim 33] (Added) rile reM-'ivcr of cifiirii 32. fiiidiyf cdiiipiisiriK ci channel equalizer for channei- equalizing data included in the demodulated RS frame using the detected known data sequences. [Claim 34] (Added) The receiver of claim 25, wherein the receiving unit receives slots corresponding to the desired KS frame using a time-siicing method. [Claim 35] (Added) The method of claim ^2. wlicrein at lea.st two of the ptiirnlity of known data sequences have different length.s. [Claim 361 (Added) The method of claim 22, wherein the TPC data and the FIC data are inserted between a first known data se'qneiice and a second known data sequence. [Claim 37] (Added) The method of claim 15. wherein the RS frame comprises a plurality of mobile and handheld (Nl/H) transport packets, each M/M transport packet including an M byte header and an N-M byte payload including IF datagram of the mobile service data. [Claim 38] (Added) The method of claim I.'k wherein K,S franK; is divided into a plurality of slots and a data group is formed from each slot, the data group comprising a plurality of datii regions, wherein first and second known data sequences are inserted into start and end portions of at least one of the data regions, respectively, and a third known data sequence is inserted in one of start and end portions of at least one of the remaining data regions. [Claim 39] (Added) The receiver nf claim 32. wherein at least two of the plurality of known data sequences have differer;t lengths. [Claim 40] (Added) The receiver of claim 33. wherein the TPC data and the FIC data are inserted between a first known data sequence and a second known data sequence. [Claim 411 (Added) The receiver of claim 25. wherein the RS frame compri.ses a plurality of mobile and ha."dheld (M/H) transport packets, each M/H transport packet including an M byte header and an N-M byte payload including IP datagram of the mobile service data. [Claim 42] (Added) The receiver of claim 25. wherein RS frame is divided into a plurality of slots and a data group is formed from each slot, the data group comprising a plurality of data regions, wherein first and second known data sequences are inserted into start and end portions of at least one of the data regions, respectively, and a third known data sequence is inserted in one of start and end portions of at least one of the remaining data regions. A digital broadcast receiver and a control method thereof are disclosed. The control method includes receiving a broadcast signal into which mobile service data and main service data arc multiplexed, extracting TPC signaling information and FIC signaling information from a data group in the received mobile service data, acquiring a program table describing virtual channel information and a service of an ensemble, using the extracted FIC signaling information, the ensemble being a virtual channel group of the received mobile service data, detecting a conditional access descriptor indicating whether the mobile service data was encrypted, using the acquired program table, and controlling such that the encrypted mobile service data is decrypted, using information of the detected conditional access descriptor. |
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| Patent Number | 279238 | ||||||||||||||||||||||||
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| Indian Patent Application Number | 1160/KOLNP/2010 | ||||||||||||||||||||||||
| PG Journal Number | 03/2017 | ||||||||||||||||||||||||
| Publication Date | 20-Jan-2017 | ||||||||||||||||||||||||
| Grant Date | 16-Jan-2017 | ||||||||||||||||||||||||
| Date of Filing | 31-Mar-2010 | ||||||||||||||||||||||||
| Name of Patentee | LG ELECTRONICS INC. | ||||||||||||||||||||||||
| Applicant Address | 20, YEOUIDO-DONG, YEONGDEUNGPO-GU, SEOUL 150-721 REPUBLIC OF KOREA | ||||||||||||||||||||||||
Inventors:
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| PCT International Classification Number | H04N 7/015 | ||||||||||||||||||||||||
| PCT International Application Number | PCT/KR2008/005634 | ||||||||||||||||||||||||
| PCT International Filing date | 2008-09-22 | ||||||||||||||||||||||||
PCT Conventions:
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