Title of Invention	METHOD FOR PROCESSING CONTROL INFORMATION IN A WIRELESS MOBILE COMMUNICATION SYSTEM
Abstract	In a wireless mobile communications system, a method for processing control information allows the operations of a mobile terminal to be simplified and permits efficient use of resources for the mobile terminal. The network instructs in advance, the transmission of control information, such as system information and the like, via a single indicator channel. The mobile terminal receives this single indicator channel and uses the indicator information that was transmitted via the indicator channel in order to receive the control information.

Title of Invention

METHOD FOR PROCESSING CONTROL INFORMATION IN A WIRELESS MOBILE COMMUNICATION SYSTEM

Abstract

In a wireless mobile communications system, a method for processing control information allows the operations of a mobile terminal to be simplified and permits efficient use of resources for the mobile terminal. The network instructs in advance, the transmission of control information, such as system information and the like, via a single indicator channel. The mobile terminal receives this single indicator channel and uses the indicator information that was transmitted via the indicator channel in order to receive the control information.

Full Text	Description METHOD FOR PROCESSING CONTROL INFORMATION IN A WIRELESS MOBILE COMMUNICATION SYSTEM Technical Field The present invention relates to wireless (radio) mobile communication systems, and in particular, relates to a method for processing control information allows the operations of a mobile terminal to be simplified and permits efficient use of resources for the mobile terminal. Background Art To support broadband wireless (e.g., WiMAX) access, there are different types of broadband wireless air interfaces, such as cellular 3G technologies (e.g., UMTS, WCDMA, etc.), and multi-carrier based multiple access techniques (e.g., OFDMA, OFDM-TDMA, OFDM-CDMA, etc.). Frequency division multiplexing involves sub- channelization, of which at least four types (OFDM, Flash OFDM, sOFDMA and OFDMA) exist. Orthogonal Frequency Division Multiplexing (OFDM) involves the splitting of a radio signal into multiple smaller sub-signals that are then transmitted simultaneously at different frequencies to a receiver. OFDM refers to a form of multi-carrier transmission where all the sub-carriers are orthogonal to each other. Certain TREE standards and 3GPP standards are related to various aspects of OFDM. Figures 1 and 2 show a typical frame that is used in OFDM. One frame has a time duration of 10 ms (milliseconds) and consists of 20 sub-frames, each having a time duration of 0.5 ms. Each sub-frame may consist of a resource block (RB) that contains data or information, and a cyclic prefix (CP) that is a guard interval needed for con- ventional OFDM modulation (but not needed for OFDM with pulse shaping, i.e., OFDM/OQAM). The sub-frame duration corresponds to the minimum downlink TTI (Transmission Time Interval). Figure 3 shows a basic downlink reference-signal structure consisting of known reference symbols. Namely, a mapping of physical channel symbols in frequency domain is shown. In other words, channel-coded, interleaved, and data-modulated in- formation (i.e., Layer 3 information) is mapped onto OFDM time/frequency symbols. The OFDM symbols can be organized into a number (M) of consecutive sub-carriers for a number (N) of consecutive OFDM symbols. Here, it is assumed that 7 OFDM symbols exist per sub-frame (when the CP length is short). In case of a long CP or a different frame structure, this basic downlink reference-signal structure would be slightly different. Reference symbols (i.e., first reference symbols) are located in the first OFDM symbol of every sub-frame assigned for downlink transmission. This is valid for both FDD and TDD, as well as for both long and short CP. Additional reference symbols (i.e., second reference symbols) are located in the third last OFDM symbol of every sub-frame assigned for downlink transmission. This is the baseline for both FDD and TDD, as well as for both long and short CP. However, for FDD, an evaluation of whether the second reference symbols are need should be made. Figure 4 shows an exemplary structure of an Evolved Universal Mobile Telecom- munications System (E-UMTS). The E-UMTS system is a system that has evolved from the UMTS system, and its standardization work is currently being performed by the 3GPP standards organization. The E-UMTS network generally comprises at least one mobile terminal (i.e., user equipment: UE), base stations (i.e., Node Bs), a control plane server (CPS) that performs radio (wireless) control functions, a radio resource management (RRM) entity that performs radio resource management functions, a mobility management entity (MME) that performs mobility management functions for a mobile terminal, and an access gateway (AG) that is located at an end of the E-UMTS network and connects with one or more external networks. Here, it can be understood that the particular names of the various network entities are not limited to those mentioned above. The various layers of the radio interface protocol between the mobile terminal and the network may be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based upon the lower three layers of the Open System Interconnection (OSI) standard model that is known the field of communication systems. Among these layers, a physical layer that is part of Layer 1 provides an information transfer service using a physical channel, while a Radio Resource Control (RRC) layer located in Layer 3 performs the function of controlling radio resources between the mobile terminal and the network. To do so, the RRC layer exchanges RRC messages between the mobile terminal and the network. The functions of the RRC layer may be distributed among and performed within the Node B, the CPS/RRM and/or the MME. Figures 5 and 6 show an exemplary architecture of the radio interface protocol between the mobile terminal and the UTRAN (UMTS Terrestrial Radio Access Network). The radio interface protocol of Figures 5 and 6 is horizontally comprised of a physical layer, a data link layer, and a network layer, and vertically comprised of a user plane for transmitting user data and a control plane for transferring control signaling. The radio interface protocol layer of Figures 5 and 6 may be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based upon the lower three layers of the Open System Interconnection (OSI) standards model that is known the field of com- munication systems. Particular layers of the radio protocol control plane of Figure 5 and of the radio protocol user plane of Figure 6 will be described below. The physical layer (i.e., Layer 1) uses a physical channel to provide an informatioa transfer service to a higher layer. The physical layer is connected with a medium access control (MAC) layer located thereabove via a transport channel, and data is transferred between the physical layer and the MAC layer via the transport channel. Also, between respectively different physical layers, namely, between the respective physical layers of the transmitting side (transmitter) and the receiving side (receiver), data is transferred via a physical channel. The MAC layer of Layer 2 provides services to a radio link control (RLC) layer (which is a higher layer) via a logical channel. The RLC layer of Layer 2 supports the transmission of data with reliability. It should be noted that the RLC layer in Figures 5 and 6 is depicted in dotted lines, because if the RLC functions are implemented in and performed by the MAC layer, the RLC layer itself may not need to exist. The PDCP layer of Layer 2 performs a header compression function that reduces unnecessary control information such that data being transmitted by employing Internet protocol (IP) packets, such as IPv4 or IPv6, can be efficiently sent over a radio (wireless) interface that has a relatively small bandwidth. The radio resource control (RRC) layer located at the lowermost portion of Layer 3 is only defined in the control plane, and handles the control of logical channels, transport channels, and physical channels with respect to the configuration, re- configuration and release of radio bearers (RB). Here, the RB refers to a service that is provided by Layer 2 for data transfer between the mobile terminal and the UTRAN. As for channels used in downlink transmission for transmitting data from the network to the mobile terminal, there is a broadcast channel (BCH) used for transmitting system information, and a shared channel (SCH) used for transmitting user traffic or control messages. As for channels used in uplink transmission for transmitting data from the mobile terminal to the network, there is a random access channel (RACH) used for transmitting an initial control message, and a shared channel (SCH) used for transmitting user traffic or control messages. Disclosure of Invention Technical Problem Before sending data to a particular mobile terminal, an indicator (which informs in advance that a notification message for a multicast and broadcast service will be transmitted) is transmitted through a separate (distinct) channel. In addition to this channel, the mobile terminal must also receive other channels, such as a broadcast channel used to periodically transmit system information. As there are a large total number of channels that a mobile terminal should receive due to transmissions through separate (distinct) channels according to each type of purpose, problems related to more complicated mobile terminal operations and a waste of mobile terminal resources occur. Technical Solution The present invention has been developed in order to solve the above described problems of the related art. As a result, the present invention provides a method for processing control information such that the operations of a mobile terminal can be simplified and permits efficient use of resources for the mobile terminal. Brief Description of the Drawings Figure 1 shows an exemplary structure of one frame used in OFDM. Figure 2 shows an exemplary structure of one sub-frame within the frame of Figure 1. Figure 3 shows an example of how data and reference symbols for OFDM may be expressed in the frequency domain and the time domain. Figure 4 shows an overview of a E-UMTS network architecture. Figures 5 and 6 show an exemplary structure (architecture) of a radio interface protocol between a mobile terminal and a UTRAN according to the 3GPP radio access network standard. Figure 7 is a diagram to explain the features of the present invention by showing where the control information and resource blocks may be located within each sub- frame with respect to frequency and time. Figure 8 is a diagram used to explain a control information transmission and reception method according to an exemplary embodiment of the present invention. Figure 9 is a diagram used to explain a control information transmission and reception method according to another exemplary embodiment of the present invention. Figure 10 is a diagram used to explain constituting information of an FCCH according to an exemplary embodiment of the present invention. Figure 11 shows a data reception method for a mobile terminal according to an exemplary embodiment of the present invention. Mode for the Invention One aspect of the present invention is the recognition by the present inventors regarding the problems and drawbacks of the related art described above and explained in more detail hereafter. Based upon such recognition, the features of the present invention have been developed. In the related art, it can be said that the system information is always fixed or non- flexible. Such fixed format allows a mobile terminal to easily detect and properly read the system information transmitted from the network. In contrast, the features of the present invention allow at least some portions of the system information to be dynamically (or flexibly) changed. Appropriate indicators are included such that a mobile terminal can properly detect and read the dynamic (flexible) system information. As a result, additional system information may be added as desired in order to support technical evolution and advancements, which thus allows for future enhancements or continued expansion of currently used system information. It should be noted that the features of the present invention are related to issues regarding the long-term evolution (LTE) of the 3GPP standard. As such, the 3GPP TS 25.813 (LTE TR) and its related sections or portions thereof, as well as various developing enhancements thereof pertain to the present invention. Such enhancements and evolution have resulted in the use of a particular prefix (the letter E) when labeling various network entities (e.g., eNode B), protocol layers, channels, and the like. However, it can be clearly understood that such labeling and other terminology are merely exemplary and thus may be altered (or later clarified) as a result of ongoing or future discussions. Figure 7 is a diagram to explain the features of the present invention by showing where the control information and resource blocks may be located within each sub- frame with respect to frequency and time. The structure (format) of a sub-frame in relation to the frequency domain and the time domain can be understood from Figure 7. Namely, a single sub-frame has a time duration of 0.5 ms with 7 OFDM symbols (portions) therein. In the first portion of the sub-frame, control information (i.e., L1/L2 control in- formation, FCCH, SCCH, etc.) is included, while resource blocks (RBs) that may be in the form of one or more chunks may be located in the remaining portion of the sub- frame. Here, a resource block may occupy the entire time duration of the sub-frame (excluding the time duration for the control information) or some partial time duration thereof. Also, each resource block (RB) may use a particular frequency range (i.e., a particular number of sub-carriers). The frequency axis can be referred to as a scalable cell bandwidth, which typically has a frequency range of 1.25 ~ 20 MHz. A plurality of sub-carriers exists in the scalable cell bandwidth. Of this frequency range, a so-called center frequency (of ap- proximately 10 MHz) is mainly used in transmitting system information. In the related art, such system information is considered to be fixed. Although this allows the terminal to easily read the system information, addition of new system in- formation is not possible. In contrast, the present invention allows for at least part of the system information to be flexible (or dynamic). To do so, the present invention divides (or separates or distinguishes) the system in- formation into primary system information (e.g., Master Information Block: MIB) and non-primary (or secondary) system information (e.g., System Information Block: SIB). The MIB is transmitted in a static manner (e.g., via a BCH for fixed manner transmission), while the SIB is transmitted in a dynamic manner (e.g., via a downlink SCH for dynamic manner transmission). Here, transmission in a dynamic manner means that different frequency ranges and time durations can be used. For each frame, the MIB contains information about where each SIB is located. Namely, the particular frequency range (i.e., sub-carriers) and particular time duration (i.e., symbols) for each SIB is specified to allow the terminal (UE) to properly read the appropriate SIBs. For example, the MIB may indicate that a particular UE (e.g., UE #11) should read a particular resource block (e.g., RB #3). Here, the RB #3 can also be expressed as the information located at certain sub-carriers and certain symbols (e.g., at sub-carriers #13~60 and symbols #3~5). In a similar manner, for each sub-frame within one frame, the control information (located in the first portion) contains information about where each resource block (RB) is located. Namely, the frequency range and particular time duration for each RB is specified to allow the terminal (UE) to properly read the appropriate RBs. The above concepts generally depicted in Figure 7 will be explained in more detail in the following description with reference to Figures 8 through 11. Figure 8 is a diagram used to explain a control information transmission and reception method according to an exemplary embodiment of the present invention. The network transmits a frame control channel (FCCH) at every particular period (i.e., a first period). Hereafter, the particular period is referred to as a frame. It should be noted that the FCCH may also be described in different terms. Namely, the control information transmitted by the network may be called L1/L2 control in- formation, FCCH, SCCH, or the like. Hereafter, such control information will mostly be referred to as FCCH, merely for the sake of explanation (although control in- formation and SCCH are also described). As shown in Figure 8, a MIB (Master Information Block) is repetitively transmitted at every second period, which is different that the above-mentioned first period. The MIB includes scheduling information for a SIB (System Information Block) that transmits system information and other resource blocks (RBs) for each type of control information. Namely, the MIB provides scheduling information related to which frequency and what time is used to transmit each type of control information, such as multiple SIBs, and the like. The second period may set to be greater than the first period. The MIB may be transmitted in the first frame of the period in which the MIB is to be transmitted. Here, the FCCH that is transmitted in each frame can inform about whether the data transmitted in the corresponding time duration (frame) is a common control message, a control message dedicated for a particular mobile terminal, common data, or data dedicated for a particular mobile terminal. Also, the FCCH informs about which frequency and what time within the frame that a control message or data of the control information is transmitted. The mobile terminal periodically receives the FCCH at every first period. If the FCCH of a particular frame indicates the transmission of a MIB, the mobile terminal receives the MIB at the corresponding frequency and time in accordance with the scheduling information included in the indicator information transmitted through the FCCH. By referring to the MIB, the mobile terminal can obtain scheduling information for particular messages, particular indicator messages, and the like. Through such scheduling information, the mobile terminal can determine which frequency and what time was used to transmit a particular SIB or the like. According to such scheduling in- formation, the mobile terminal can receive a message with respect to the SIB, and the subscribed service that is should receive. The MIB may include either a mobile terminal identifier or a service identifier, or may include an indicator that indicates such an identifier. Figure 9 is a diagram used to explain a control information transmission and reception method according to another exemplary embodiment of the present invention. A cell that supports broadband frequencies with a bandwidth of 10 or 20 MHz, can provide a system bandwidth of narrowband frequencies for a mobile terminal operating in narrowband frequencies such as 1.25 MHz, 2.5 MHz, or the like. In this case, as shown in Figure 9, a central bandwidth of the broadband frequencies is typically used for the system bandwidth. Here, the MIB, the SIBs, and the like should all be transmitted in the system bandwidth. However, SIBs that transmit particular system information may be transmitted outside of the system bandwidth. The FCCH (or other type of system information like L1/L2 control information, SCCH, etc.) transmitted in each frame indicates whether the data transmitted in the corresponding time duration (frame) is a MIB, an SIB, or the like. Also, the FCCH informs about which frequency and what time within the frame that each message or data is transmitted. The FCCH may be transmitted upon being diyided into an FCCH for system bandwidth and an FCCH for non-system bandwidth. Accordingly, a mobile terminal that only receives the system bandwidth may receive the FCCH for system bandwidth to obtain information of each data or message that is transmitted via the system bandwidth. Also, a mobile terminal that receives the non-system bandwidth may receive the FCCH for non-system bandwidth to obtain information of each data or message that is transmitted via the non-system bandwidth. In other words, the concepts shown in Figure 9 are for handling the situation for mobile terminals in idle mode. The network (system) supports the cell bandwidth of 20 MHz, while a mobile terminal typically can only support a 10 MHz bandwidth range. Thus, the L1/L2 control information needs to be transmitted in certain units (a frequency range) such as, a range of 10 MHz, 5 MHz, or the like. As a result, there may be three scenarios for the frequency ranges used by the mobile terminal for reading data. Namely, of the 20 MHz scalable cell bandwidth, the mobile terminal may read one of three frequency ranges, i.e., the lower 10 MHz, the upper 10 MHz, or a middle (intermediate) 10 MHz thereof. For mobile terminals in RRC connected mode, because the particular cell in which the connected mode mobile terminal is located is known, any one of the three 10 MHz ranges and appropriate switching among these three 10 MHz ranges is possible. However, for a mobile terminal in idle mode, because the particular cell in which the terminal is located cannot be known, only one of these three 10 MHz ranges can be used (typically, the intermediate 10 MHz range is used). Meanwhile, the bandwidth outside the intermediate 10 MHz range can be used for transmitting and receiving resource blocks for mobile terminals in connected mode. Here, although the above exemplary embodiment with reference to Figure 9 is described for 10 MHz ranges, it is contemplated that the 20MHz scalable cell bandwidth could also be divided up into 5 MHz units. Figure 10 is a diagram used to explain constituting information of control in- formation (i.e., an FCCH) according to an exemplary embodiment of the present invention. The FCCH provides to the mobile terminal, various types of control in- formation related to data and control messages transmitted during the corresponding period (i.e., during the corresponding frame). Here, the FCCH is shown to be comprised of five different FCCH portions. However, this is merely exemplary, and the number of FCCH portions may vary accordingly. Referring to Figure 10, the first FCCH portion is a FCCH MAP that informs about the frequency and time of the FCCH transmission, a length of the FCCH information, radio resource parameters needed for receiving the FCCH information, and the like. Such FCCH MAP may be always included in each frame. In the present invention, each frame may include all types of FCCHs or may include only portions thereof. The FCCH MAP may inform about whether or not the remaining four types of FCCH portions (excluding the FCCH MAP) are transmitted in the corresponding frame. The second FCCH portion is a FCCH Idle Mode (DL) that includes control in- formation needed on order to receive downlink control information when the mobile terminal is in idle mode. This second FCCH portion may be included in a cor- responding frame when control information to be transmitted on the downlink exists in the frame. The control information related to common control messages such as the MIB, SIB, etc. may be included in this second FCCH portion. Also, the MIB, SIB, etc. may be included in this second FCCH portion. The third FCCH portion is a FCCH Idle Mode (UL) that includes control in- formation needed in order to transmit uplink control information when the mobile terminal is in idle mode. This third FCCH portion may include information that is needed for uplink random access transmissions. When the mobile terminal transmits a random access message, the network may transmit a response to the ransom access message via this third FCCH portion. Also, the third FCCH portion can be used to inform that a response to the random access message is being transmitted in the frame that is used to transmit the third FCCH portion, and to do so, the third FCCH portion includes control information related to such response to the random access message. The fourth FCCH portion includes control information needed in order to receive downlink control information when the mobile terminal is in active mode. This fourth FCCH portion may include control information of an downlink shared channel (SCH) that is transmitted in a corresponding frame. The fifth FCCH portion includes control information needed in order to transmit uplink control information when the mobile terminal is in active mode. This fifth FCCH portion may include control information of an uplink shared channel (SCH) that is transmitted in a corresponding frame. The mobile terminal periodically receives the FCCH MAP and may check to see whether the corresponding frame contains any data or information that is wishes to receive. After receiving the FCCH MAP, when the mobile terminal is in idle mode, only the second and third FCCH portions are received. When the mobile terminal is in active mode, only the fourth and fifth FCCH portions are received. In order to inform about the control information that is needed for multicast and broadcast transmissions, the network may add and transmit other FCCH portions as needed. Figure 11 shows a data reception method for a mobile terminal according to an exemplary embodiment of the present invention. Referring to Figure 11, the SCCH channel (i.e., control information) is transmitted using a respectively different frequency and time from those of the SCH, and is transmitted once per each sub-frame. One sub-frame is 0.5 ms in duration and the SCCH channel is transmitted by using one or two symbols that constitute the corresponding sub-frame. A single sub-frame consists of 6 or 7 symbols, and respectively different symbols constitute respectively different time periods (durations). In Figure 11, the SCCH channel that is transmitted in a single sub-frame, transmits control information related to a SCH channel of the corresponding sub-frame. The control information transmitted through the SCCH channel may comprise a mobile terminal identifier (identity), a multicast service identifier (identity), and a logical channel identifier (identity). The logical channel identifier may inform whether the data transmitted in a sub-frame of the corresponding SCH channel is data for a mobile terminal dedicated channel (e.g., DCCH or DTCH) or data for a common channel. In particular, if the data is for a common channel, the logical channel identifier informs about the type of common channel (i.e., BCCH, PCCH, MCCH, MTCH, or CCCH). The mobile terminal may receive the SCCH channel in a periodic manner or at every sub-frame. To do so, the base station (eNode B) transmits period information to the mobile terminal. Then, the mobile terminal may receive the sub-frames of the SCCH channel in a periodic manner according to the period information provided from the base station. The mobile terminal obtains the logical channel identifier through the received SCCH channel, and by means of the obtained logical channel identifier, the mobile terminal can determine whether the data transmitted via the SCH channel is data for a dedicated channel or data for one of a BCCH, PCCH, MCCH, MTCH or CCCH (i.e., a common channel). If the logical channel identifier indicates a common channel, the mobile terminal receives the sub-frame of the corresponding SCH channel to thus receive the data of the common channel. It should be noted that Figures 1 through 11 show exemplary embodiments for a 10 ms frame having twenty 0.5 ms sub-frames. However, the features of the present invention are clearly applicable to other techniques that employ other frame sizes. For example, a frame size of 5 ms may be used, and to support LTE (Long Term Evolution) techniques, a frame size of 0.5 ms may be used. Regarding the effects of the present invention, the wireless network can, in advance, inform (through a single indicator channel) about the transmission of common control information (such as particular messages, system information, or the like). A radio mobile terminal can periodically receive the single indicator channel to thus receive the common control information by using the control information of the indicator channel. By using such procedures, the operations of the mobile terminal may be simplified and mobile terminal resources can be used more efficiently. Additionally, as the present invention provides information about where each resource block (RB) is located with respect to the frequency and time domains, system information, control information, and the like can be processed in a dynamic and flexible manner, to thus support various enhanced capabilities. Also, when frequency selective scheduling is performed, improved adaptation to channel changes can be achieved. The present invention provides a method for processing (downlink) system in- formation for a mobile terminal, the method comprising: receiving primary system in- formation in a static manner; and receiving non-primary system information in a dynamic manner based on the primary system information. The dynamic manner may be based upon at least one of frequency, time, and size of the non-primary system information. The primary system information may include scheduling information that indicates at least one of a time characteristic and a frequency characteristic of the non-primary system information. The primary system information may further comprise an indicator for indicating a particular terminal. The time characteristic and the frequency characteristic may indicate a location of each non-primary system information to be read by the particular terminal. The indicator may comprise: at least one of a terminal identifier, a service identifier, and a logical channel identifier. The non-primary system information may relate to control in- formation. The control information may be used to read actual data. The time char- acteristic may relate to symbols, and the frequency information relates to sub-carriers. The non-primary information is in the form of at least one resource block. The primary system information may be in the form of a master information block (MB), and the non-primary system information is in the form of a system information block (SIB). The MEB also contains size information of an SIB. Also, the present invention provides a method for processing (downlink) system in- formation for a network, the method comprising: transmitting primary system in- formation in a static manner; and transmitting non-primary system information in a dynamic manner based on the primary system information. The dynamic manner may be based upon at least one of frequency, time, and size of the non-primary system information. The primary system information may include scheduling information that indicates at least one of a time characteristic and a frequency characteristic of the non-primary system information. The primary system information may further comprise an indicator for indicating a particular terminal. The time characteristic and the frequency characteristic may indicate a location of each non-primary system information to be read by the particular terminal. The indicator may comprise: at least one of a terminal identifier, a service identifier, and a logical channel identifier. The non-primary system information may relate to control in- formation. The control information may be used to read actual data. The time char- acteristic relates to symbols, and the frequency information may relate to sub-carriers. The non-primary information may be in the form of at least one resource block. The primary system information may be in the form of a master information block (MIB), and the non-primary system information is in the form of a system Information block (SIB). The MIB may also contain size information of an SIB. Additionally, the present invention provides a frame structure used for processing system information, the structure comprising: a first sub-frame containing static primary system information; and one or more subsequent sub-frames containing at least one dynamic non-primary system information, wherein the static primary system information includes scheduling information that indicates time and frequency in- formation of the non-primary system information. The static primary system information may further comprise an indicator for indicating a particular terminal. The time and frequency information may indicate a location of each dynamic non-primary system information to be read by the particular terminal. The indicator may comprise: at least one of a terminal identifier, a service identifier, and a logical channel identifier. The non-primary system information may relate to control information. The control information may be used to read actual data. The time information may relate to symbols, and the frequency information relates to sub-carriers. The dynamic non-primary information may be in the form of at least one resource block. The static primary system information may be in the form of a master information block (MIB), and the dynamic non-primary system information is in the form of a system information block (SIB). The MIB may also contain size information of an SIB. The non-primary system information may comprise control information that includes separate information for idle mode and active mode operation of a mobile terminal. This specification describes various illustrative embodiments of the present invention. The scope of the claims is intended to cover various modifications and equivalent arrangements of the illustrative embodiments disclosed in the specification. Therefore, the following claims should be accorded the reasonably broadest inter- pretation to cover modifications, equivalent structures, and features that are consistent with the spirit and scope of the invention disclosed herein. Claims A method for processing system information for a mobile terminal, the method comprising: receiving primary system information in a static manner; and receiving non-primary system information in a dynamic manner based on the primary system information. The method of claim 1, wherein the dynamic manner is based upon at least one of frequency, time, and size of the non-primary system information. The method of claim 1, wherein the primary system information includes scheduling information that indicates at least one of a time characteristic and a frequency characteristic of the non-primary system information. The method of claim 3, wherein the time characteristic and the frequency char- acteristic indicate a location of the non-primary system information to be read by the particular terminal. The method of claim 4, wherein the primary system information further comprises an indicator for indicating a particular terminal. The method of claim 5, wherein the indicator comprises: at least one of a terminal identifier, a service identifier, and a logical channel identifier. The method of claim 1, wherein the non-primary system information relates to control information. The method of claim 7, wherein the control information is used to read actual data. The method of claim 3, wherein the time characteristic relates to symbols and the frequency characteristic relates to sub-carriers. The method of claim 1, wherein the non-primary system information is in the form of at least one resource block. The method of claim 1, wherein the primary system information is in the form of a master information block (MIB) and the non-primary system information is in the form of a system information block (SIB). The method of claim 11, wherein the MIB also contains size information of an SIB. A method for processing system information for a network, the method comprising: transmitting primary system information in a static manner; and transmitting non-primary system information in a dynamic manner based on the primary system information. The method of claim 13, wherein the dynamic manner is based upon at least one of frequency, time, and size of the non-primary system information. The method of claim 13, wherein the primary system information includes scheduling information that indicates at least one of a time characteristic and a frequency characteristic of the non-primary system information. The method of claim 15, wherein the primary system information further comprises an indicator for indicating a particular terminal. The method of claim 16, wherein the time characteristic and the frequency char- acteristic indicate a location of the non-primary system information to be read by the particular terminal. The method of claim 16, wherein the indicator comprises: at least one of a terminal identifier, a service identifier, and a logical channel identifier. The method of claim 13, wherein the non-primary system information relates to control information. The method of claim 18, wherein the control information is used to read actual data. The method of claim 15, wherein the time characteristic relates to symbols and the frequency characteristic relates to sub-carriers. The method of claim 13, wherein the non-primary system information is in the form of at least one resource block. The method of claim 13, wherein the primary system information is in the form of a master information block (MEB) and the non-primary system information is in the form of a system information block (SIB). The method of claim 13, wherein the MIB also contains size information of an SIB. A frame structure used for processing system information, the structure comprising: a first sub-frame containing static primary system information; and one or more subsequent sub-frames containing at least one dynamic non-primary system information, wherein the static primary system information includes scheduling information that indicates time and frequency information of the non-primary system in- formation. The structure of claim 25, wherein the static primary system information further comprises an indicator for indicating a particular terminal. The structure of claim 26, wherein the time and frequency information indicates a location of each dynamic non-primary system information to be read by the particular terminal. The structure of claim 26, wherein the indicator comprises: at least one of a terminal identifier, a service identifier, and a logical channel identifier. The structure of claim 25, wherein the non-primary system information relates to control information. The structure of claim 29, wherein the control information is used to read actual data. The structure of claim 25, wherein the time information relates to symbols, and the frequency information relates to sub-carriers. The structure of claim 25, wherein the dynamic non-primary information is in the form of at least one resource block. The structure of claim 25, wherein the static primary system information is in the form of a master information block (MIB), and the dynamic non-primary system information is in the form of a system information block (SIB). The structure of claim 33, wherein the MIB also contains size information of an SIB. The structure of claim 25, wherein the non-primary system information comprises control information that includes separate information for idle mode and active mode operation of a mobile terminal. In a wireless mobile communications system, a method for processing control information allows the operations of a mobile terminal to be simplified and permits efficient use of resources for the mobile terminal. The network instructs in advance, the transmission of control information, such as system information and the like, via a single indicator channel. The mobile terminal receives this single indicator channel and uses the indicator information that was transmitted via the indicator channel in order to receive the control information.

Full Text

Description
METHOD FOR PROCESSING CONTROL INFORMATION IN A
WIRELESS MOBILE COMMUNICATION SYSTEM
Technical Field
The present invention relates to wireless (radio) mobile communication systems,
and in particular, relates to a method for processing control information allows the
operations of a mobile terminal to be simplified and permits efficient use of resources
for the mobile terminal.
Background Art
To support broadband wireless (e.g., WiMAX) access, there are different types of
broadband wireless air interfaces, such as cellular 3G technologies (e.g., UMTS,
WCDMA, etc.), and multi-carrier based multiple access techniques (e.g., OFDMA,
OFDM-TDMA, OFDM-CDMA, etc.). Frequency division multiplexing involves sub-
channelization, of which at least four types (OFDM, Flash OFDM, sOFDMA and
OFDMA) exist.
Orthogonal Frequency Division Multiplexing (OFDM) involves the splitting of a
radio signal into multiple smaller sub-signals that are then transmitted simultaneously
at different frequencies to a receiver. OFDM refers to a form of multi-carrier
transmission where all the sub-carriers are orthogonal to each other. Certain TREE
standards and 3GPP standards are related to various aspects of OFDM.
Figures 1 and 2 show a typical frame that is used in OFDM. One frame has a time
duration of 10 ms (milliseconds) and consists of 20 sub-frames, each having a time
duration of 0.5 ms. Each sub-frame may consist of a resource block (RB) that contains
data or information, and a cyclic prefix (CP) that is a guard interval needed for con-
ventional OFDM modulation (but not needed for OFDM with pulse shaping, i.e.,
OFDM/OQAM). The sub-frame duration corresponds to the minimum downlink TTI
(Transmission Time Interval).
Figure 3 shows a basic downlink reference-signal structure consisting of known
reference symbols. Namely, a mapping of physical channel symbols in frequency
domain is shown. In other words, channel-coded, interleaved, and data-modulated in-
formation (i.e., Layer 3 information) is mapped onto OFDM time/frequency symbols.
The OFDM symbols can be organized into a number (M) of consecutive sub-carriers
for a number (N) of consecutive OFDM symbols.
Here, it is assumed that 7 OFDM symbols exist per sub-frame (when the CP length
is short). In case of a long CP or a different frame structure, this basic downlink
reference-signal structure would be slightly different.
Reference symbols (i.e., first reference symbols) are located in the first OFDM
symbol of every sub-frame assigned for downlink transmission. This is valid for both
FDD and TDD, as well as for both long and short CP. Additional reference symbols
(i.e., second reference symbols) are located in the third last OFDM symbol of every
sub-frame assigned for downlink transmission. This is the baseline for both FDD and
TDD, as well as for both long and short CP. However, for FDD, an evaluation of
whether the second reference symbols are need should be made.
Figure 4 shows an exemplary structure of an Evolved Universal Mobile Telecom-
munications System (E-UMTS). The E-UMTS system is a system that has evolved
from the UMTS system, and its standardization work is currently being performed by
the 3GPP standards organization.
The E-UMTS network generally comprises at least one mobile terminal (i.e., user
equipment: UE), base stations (i.e., Node Bs), a control plane server (CPS) that
performs radio (wireless) control functions, a radio resource management (RRM)
entity that performs radio resource management functions, a mobility management
entity (MME) that performs mobility management functions for a mobile terminal, and
an access gateway (AG) that is located at an end of the E-UMTS network and connects
with one or more external networks. Here, it can be understood that the particular
names of the various network entities are not limited to those mentioned above.
The various layers of the radio interface protocol between the mobile terminal and
the network may be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based
upon the lower three layers of the Open System Interconnection (OSI) standard model
that is known the field of communication systems. Among these layers, a physical
layer that is part of Layer 1 provides an information transfer service using a physical
channel, while a Radio Resource Control (RRC) layer located in Layer 3 performs the
function of controlling radio resources between the mobile terminal and the network.
To do so, the RRC layer exchanges RRC messages between the mobile terminal and
the network. The functions of the RRC layer may be distributed among and performed
within the Node B, the CPS/RRM and/or the MME.
Figures 5 and 6 show an exemplary architecture of the radio interface protocol
between the mobile terminal and the UTRAN (UMTS Terrestrial Radio Access
Network). The radio interface protocol of Figures 5 and 6 is horizontally comprised of
a physical layer, a data link layer, and a network layer, and vertically comprised of a
user plane for transmitting user data and a control plane for transferring control
signaling. The radio interface protocol layer of Figures 5 and 6 may be divided into L1
(Layer 1), L2 (Layer 2), and L3 (Layer 3) based upon the lower three layers of the
Open System Interconnection (OSI) standards model that is known the field of com-
munication systems.
Particular layers of the radio protocol control plane of Figure 5 and of the radio
protocol user plane of Figure 6 will be described below. The physical layer (i.e., Layer
1) uses a physical channel to provide an informatioa transfer service to a higher layer.
The physical layer is connected with a medium access control (MAC) layer located
thereabove via a transport channel, and data is transferred between the physical layer
and the MAC layer via the transport channel. Also, between respectively different
physical layers, namely, between the respective physical layers of the transmitting side
(transmitter) and the receiving side (receiver), data is transferred via a physical
channel.
The MAC layer of Layer 2 provides services to a radio link control (RLC) layer
(which is a higher layer) via a logical channel. The RLC layer of Layer 2 supports the
transmission of data with reliability. It should be noted that the RLC layer in Figures 5
and 6 is depicted in dotted lines, because if the RLC functions are implemented in and
performed by the MAC layer, the RLC layer itself may not need to exist. The PDCP
layer of Layer 2 performs a header compression function that reduces unnecessary
control information such that data being transmitted by employing Internet protocol
(IP) packets, such as IPv4 or IPv6, can be efficiently sent over a radio (wireless)
interface that has a relatively small bandwidth.
The radio resource control (RRC) layer located at the lowermost portion of Layer 3
is only defined in the control plane, and handles the control of logical channels,
transport channels, and physical channels with respect to the configuration, re-
configuration and release of radio bearers (RB). Here, the RB refers to a service that is
provided by Layer 2 for data transfer between the mobile terminal and the UTRAN.
As for channels used in downlink transmission for transmitting data from the
network to the mobile terminal, there is a broadcast channel (BCH) used for
transmitting system information, and a shared channel (SCH) used for transmitting
user traffic or control messages. As for channels used in uplink transmission for
transmitting data from the mobile terminal to the network, there is a random access
channel (RACH) used for transmitting an initial control message, and a shared channel
(SCH) used for transmitting user traffic or control messages.
Disclosure of Invention
Technical Problem
Before sending data to a particular mobile terminal, an indicator (which informs in
advance that a notification message for a multicast and broadcast service will be
transmitted) is transmitted through a separate (distinct) channel. In addition to this
channel, the mobile terminal must also receive other channels, such as a broadcast
channel used to periodically transmit system information. As there are a large total
number of channels that a mobile terminal should receive due to transmissions through
separate (distinct) channels according to each type of purpose, problems related to
more complicated mobile terminal operations and a waste of mobile terminal resources
occur.
Technical Solution
The present invention has been developed in order to solve the above described
problems of the related art. As a result, the present invention provides a method for
processing control information such that the operations of a mobile terminal can be
simplified and permits efficient use of resources for the mobile terminal.
Brief Description of the Drawings
Figure 1 shows an exemplary structure of one frame used in OFDM.
Figure 2 shows an exemplary structure of one sub-frame within the frame of Figure
1.
Figure 3 shows an example of how data and reference symbols for OFDM may be
expressed in the frequency domain and the time domain.
Figure 4 shows an overview of a E-UMTS network architecture.
Figures 5 and 6 show an exemplary structure (architecture) of a radio interface
protocol between a mobile terminal and a UTRAN according to the 3GPP radio access
network standard.
Figure 7 is a diagram to explain the features of the present invention by showing
where the control information and resource blocks may be located within each sub-
frame with respect to frequency and time.
Figure 8 is a diagram used to explain a control information transmission and
reception method according to an exemplary embodiment of the present invention.
Figure 9 is a diagram used to explain a control information transmission and
reception method according to another exemplary embodiment of the present
invention.
Figure 10 is a diagram used to explain constituting information of an FCCH
according to an exemplary embodiment of the present invention.
Figure 11 shows a data reception method for a mobile terminal according to an
exemplary embodiment of the present invention.
Mode for the Invention
One aspect of the present invention is the recognition by the present inventors
regarding the problems and drawbacks of the related art described above and explained
in more detail hereafter. Based upon such recognition, the features of the present
invention have been developed.
In the related art, it can be said that the system information is always fixed or non-
flexible. Such fixed format allows a mobile terminal to easily detect and properly read
the system information transmitted from the network.
In contrast, the features of the present invention allow at least some portions of the
system information to be dynamically (or flexibly) changed. Appropriate indicators are
included such that a mobile terminal can properly detect and read the dynamic
(flexible) system information. As a result, additional system information may be added
as desired in order to support technical evolution and advancements, which thus allows
for future enhancements or continued expansion of currently used system information.
It should be noted that the features of the present invention are related to issues
regarding the long-term evolution (LTE) of the 3GPP standard. As such, the 3GPP TS
25.813 (LTE TR) and its related sections or portions thereof, as well as various
developing enhancements thereof pertain to the present invention. Such enhancements
and evolution have resulted in the use of a particular prefix (the letter E) when labeling
various network entities (e.g., eNode B), protocol layers, channels, and the like.
However, it can be clearly understood that such labeling and other terminology are
merely exemplary and thus may be altered (or later clarified) as a result of ongoing or
future discussions.
Figure 7 is a diagram to explain the features of the present invention by showing
where the control information and resource blocks may be located within each sub-
frame with respect to frequency and time.
The structure (format) of a sub-frame in relation to the frequency domain and the
time domain can be understood from Figure 7. Namely, a single sub-frame has a time
duration of 0.5 ms with 7 OFDM symbols (portions) therein.
In the first portion of the sub-frame, control information (i.e., L1/L2 control in-
formation, FCCH, SCCH, etc.) is included, while resource blocks (RBs) that may be in
the form of one or more chunks may be located in the remaining portion of the sub-
frame. Here, a resource block may occupy the entire time duration of the sub-frame
(excluding the time duration for the control information) or some partial time duration
thereof. Also, each resource block (RB) may use a particular frequency range (i.e., a
particular number of sub-carriers).
The frequency axis can be referred to as a scalable cell bandwidth, which typically
has a frequency range of 1.25 ~ 20 MHz. A plurality of sub-carriers exists in the
scalable cell bandwidth. Of this frequency range, a so-called center frequency (of ap-
proximately 10 MHz) is mainly used in transmitting system information.
In the related art, such system information is considered to be fixed. Although this
allows the terminal to easily read the system information, addition of new system in-
formation is not possible. In contrast, the present invention allows for at least part of
the system information to be flexible (or dynamic).
To do so, the present invention divides (or separates or distinguishes) the system in-
formation into primary system information (e.g., Master Information Block: MIB) and
non-primary (or secondary) system information (e.g., System Information Block: SIB).
The MIB is transmitted in a static manner (e.g., via a BCH for fixed manner
transmission), while the SIB is transmitted in a dynamic manner (e.g., via a downlink
SCH for dynamic manner transmission). Here, transmission in a dynamic manner
means that different frequency ranges and time durations can be used.
For each frame, the MIB contains information about where each SIB is located.
Namely, the particular frequency range (i.e., sub-carriers) and particular time duration
(i.e., symbols) for each SIB is specified to allow the terminal (UE) to properly read the
appropriate SIBs. For example, the MIB may indicate that a particular UE (e.g., UE
#11) should read a particular resource block (e.g., RB #3). Here, the RB #3 can also be
expressed as the information located at certain sub-carriers and certain symbols (e.g.,
at sub-carriers #13~60 and symbols #3~5).
In a similar manner, for each sub-frame within one frame, the control information
(located in the first portion) contains information about where each resource block
(RB) is located. Namely, the frequency range and particular time duration for each RB
is specified to allow the terminal (UE) to properly read the appropriate RBs.
The above concepts generally depicted in Figure 7 will be explained in more detail
in the following description with reference to Figures 8 through 11.
Figure 8 is a diagram used to explain a control information transmission and
reception method according to an exemplary embodiment of the present invention. The
network transmits a frame control channel (FCCH) at every particular period (i.e., a
first period). Hereafter, the particular period is referred to as a frame.
It should be noted that the FCCH may also be described in different terms. Namely,
the control information transmitted by the network may be called L1/L2 control in-
formation, FCCH, SCCH, or the like. Hereafter, such control information will mostly
be referred to as FCCH, merely for the sake of explanation (although control in-
formation and SCCH are also described).
As shown in Figure 8, a MIB (Master Information Block) is repetitively transmitted
at every second period, which is different that the above-mentioned first period. The
MIB includes scheduling information for a SIB (System Information Block) that
transmits system information and other resource blocks (RBs) for each type of control
information. Namely, the MIB provides scheduling information related to which
frequency and what time is used to transmit each type of control information, such as
multiple SIBs, and the like. The second period may set to be greater than the first
period. The MIB may be transmitted in the first frame of the period in which the MIB
is to be transmitted.
Here, the FCCH that is transmitted in each frame can inform about whether the data
transmitted in the corresponding time duration (frame) is a common control message, a
control message dedicated for a particular mobile terminal, common data, or data
dedicated for a particular mobile terminal. Also, the FCCH informs about which
frequency and what time within the frame that a control message or data of the control
information is transmitted.
The mobile terminal periodically receives the FCCH at every first period. If the
FCCH of a particular frame indicates the transmission of a MIB, the mobile terminal
receives the MIB at the corresponding frequency and time in accordance with the
scheduling information included in the indicator information transmitted through the
FCCH. By referring to the MIB, the mobile terminal can obtain scheduling information
for particular messages, particular indicator messages, and the like. Through such
scheduling information, the mobile terminal can determine which frequency and what
time was used to transmit a particular SIB or the like. According to such scheduling in-
formation, the mobile terminal can receive a message with respect to the SIB, and the
subscribed service that is should receive.
The MIB may include either a mobile terminal identifier or a service identifier, or
may include an indicator that indicates such an identifier.
Figure 9 is a diagram used to explain a control information transmission and
reception method according to another exemplary embodiment of the present
invention. A cell that supports broadband frequencies with a bandwidth of 10 or 20
MHz, can provide a system bandwidth of narrowband frequencies for a mobile
terminal operating in narrowband frequencies such as 1.25 MHz, 2.5 MHz, or the like.
In this case, as shown in Figure 9, a central bandwidth of the broadband frequencies is
typically used for the system bandwidth. Here, the MIB, the SIBs, and the like should
all be transmitted in the system bandwidth. However, SIBs that transmit particular
system information may be transmitted outside of the system bandwidth.
The FCCH (or other type of system information like L1/L2 control information,
SCCH, etc.) transmitted in each frame indicates whether the data transmitted in the
corresponding time duration (frame) is a MIB, an SIB, or the like. Also, the FCCH
informs about which frequency and what time within the frame that each message or
data is transmitted. The FCCH may be transmitted upon being diyided into an FCCH
for system bandwidth and an FCCH for non-system bandwidth. Accordingly, a mobile
terminal that only receives the system bandwidth may receive the FCCH for system
bandwidth to obtain information of each data or message that is transmitted via the
system bandwidth. Also, a mobile terminal that receives the non-system bandwidth
may receive the FCCH for non-system bandwidth to obtain information of each data or
message that is transmitted via the non-system bandwidth.
In other words, the concepts shown in Figure 9 are for handling the situation for
mobile terminals in idle mode.
The network (system) supports the cell bandwidth of 20 MHz, while a mobile
terminal typically can only support a 10 MHz bandwidth range. Thus, the L1/L2
control information needs to be transmitted in certain units (a frequency range) such as,
a range of 10 MHz, 5 MHz, or the like. As a result, there may be three scenarios for the
frequency ranges used by the mobile terminal for reading data. Namely, of the 20 MHz
scalable cell bandwidth, the mobile terminal may read one of three frequency ranges,
i.e., the lower 10 MHz, the upper 10 MHz, or a middle (intermediate) 10 MHz thereof.
For mobile terminals in RRC connected mode, because the particular cell in which
the connected mode mobile terminal is located is known, any one of the three 10 MHz
ranges and appropriate switching among these three 10 MHz ranges is possible.
However, for a mobile terminal in idle mode, because the particular cell in which the
terminal is located cannot be known, only one of these three 10 MHz ranges can be
used (typically, the intermediate 10 MHz range is used). Meanwhile, the bandwidth
outside the intermediate 10 MHz range can be used for transmitting and receiving
resource blocks for mobile terminals in connected mode.
Here, although the above exemplary embodiment with reference to Figure 9 is
described for 10 MHz ranges, it is contemplated that the 20MHz scalable cell
bandwidth could also be divided up into 5 MHz units.
Figure 10 is a diagram used to explain constituting information of control in-
formation (i.e., an FCCH) according to an exemplary embodiment of the present
invention. The FCCH provides to the mobile terminal, various types of control in-
formation related to data and control messages transmitted during the corresponding
period (i.e., during the corresponding frame). Here, the FCCH is shown to be
comprised of five different FCCH portions. However, this is merely exemplary, and
the number of FCCH portions may vary accordingly.
Referring to Figure 10, the first FCCH portion is a FCCH MAP that informs about
the frequency and time of the FCCH transmission, a length of the FCCH information,
radio resource parameters needed for receiving the FCCH information, and the like.
Such FCCH MAP may be always included in each frame. In the present invention,
each frame may include all types of FCCHs or may include only portions thereof. The
FCCH MAP may inform about whether or not the remaining four types of FCCH
portions (excluding the FCCH MAP) are transmitted in the corresponding frame.
The second FCCH portion is a FCCH Idle Mode (DL) that includes control in-
formation needed on order to receive downlink control information when the mobile
terminal is in idle mode. This second FCCH portion may be included in a cor-
responding frame when control information to be transmitted on the downlink exists in
the frame. The control information related to common control messages such as the
MIB, SIB, etc. may be included in this second FCCH portion. Also, the MIB, SIB, etc.
may be included in this second FCCH portion.
The third FCCH portion is a FCCH Idle Mode (UL) that includes control in-
formation needed in order to transmit uplink control information when the mobile
terminal is in idle mode. This third FCCH portion may include information that is
needed for uplink random access transmissions. When the mobile terminal transmits a
random access message, the network may transmit a response to the ransom access
message via this third FCCH portion. Also, the third FCCH portion can be used to
inform that a response to the random access message is being transmitted in the frame
that is used to transmit the third FCCH portion, and to do so, the third FCCH portion
includes control information related to such response to the random access message.
The fourth FCCH portion includes control information needed in order to receive
downlink control information when the mobile terminal is in active mode. This fourth
FCCH portion may include control information of an downlink shared channel (SCH)
that is transmitted in a corresponding frame.
The fifth FCCH portion includes control information needed in order to transmit
uplink control information when the mobile terminal is in active mode. This fifth
FCCH portion may include control information of an uplink shared channel (SCH) that
is transmitted in a corresponding frame.
The mobile terminal periodically receives the FCCH MAP and may check to see
whether the corresponding frame contains any data or information that is wishes to
receive. After receiving the FCCH MAP, when the mobile terminal is in idle mode,
only the second and third FCCH portions are received. When the mobile terminal is in
active mode, only the fourth and fifth FCCH portions are received.
In order to inform about the control information that is needed for multicast and
broadcast transmissions, the network may add and transmit other FCCH portions as
needed.
Figure 11 shows a data reception method for a mobile terminal according to an
exemplary embodiment of the present invention. Referring to Figure 11, the SCCH
channel (i.e., control information) is transmitted using a respectively different
frequency and time from those of the SCH, and is transmitted once per each sub-frame.
One sub-frame is 0.5 ms in duration and the SCCH channel is transmitted by using one
or two symbols that constitute the corresponding sub-frame. A single sub-frame
consists of 6 or 7 symbols, and respectively different symbols constitute respectively
different time periods (durations).
In Figure 11, the SCCH channel that is transmitted in a single sub-frame, transmits
control information related to a SCH channel of the corresponding sub-frame. The
control information transmitted through the SCCH channel may comprise a mobile
terminal identifier (identity), a multicast service identifier (identity), and a logical
channel identifier (identity). The logical channel identifier may inform whether the
data transmitted in a sub-frame of the corresponding SCH channel is data for a mobile
terminal dedicated channel (e.g., DCCH or DTCH) or data for a common channel. In
particular, if the data is for a common channel, the logical channel identifier informs
about the type of common channel (i.e., BCCH, PCCH, MCCH, MTCH, or CCCH).
The mobile terminal may receive the SCCH channel in a periodic manner or at
every sub-frame. To do so, the base station (eNode B) transmits period information to
the mobile terminal. Then, the mobile terminal may receive the sub-frames of the
SCCH channel in a periodic manner according to the period information provided from
the base station.
The mobile terminal obtains the logical channel identifier through the received
SCCH channel, and by means of the obtained logical channel identifier, the mobile
terminal can determine whether the data transmitted via the SCH channel is data for a
dedicated channel or data for one of a BCCH, PCCH, MCCH, MTCH or CCCH (i.e., a
common channel).
If the logical channel identifier indicates a common channel, the mobile terminal
receives the sub-frame of the corresponding SCH channel to thus receive the data of
the common channel.
It should be noted that Figures 1 through 11 show exemplary embodiments for a 10
ms frame having twenty 0.5 ms sub-frames. However, the features of the present
invention are clearly applicable to other techniques that employ other frame sizes. For
example, a frame size of 5 ms may be used, and to support LTE (Long Term
Evolution) techniques, a frame size of 0.5 ms may be used.
Regarding the effects of the present invention, the wireless network can, in advance,
inform (through a single indicator channel) about the transmission of common control
information (such as particular messages, system information, or the like). A radio
mobile terminal can periodically receive the single indicator channel to thus receive the
common control information by using the control information of the indicator channel.
By using such procedures, the operations of the mobile terminal may be simplified and
mobile terminal resources can be used more efficiently.
Additionally, as the present invention provides information about where each
resource block (RB) is located with respect to the frequency and time domains, system
information, control information, and the like can be processed in a dynamic and
flexible manner, to thus support various enhanced capabilities. Also, when frequency
selective scheduling is performed, improved adaptation to channel changes can be
achieved.
The present invention provides a method for processing (downlink) system in-
formation for a mobile terminal, the method comprising: receiving primary system in-
formation in a static manner; and receiving non-primary system information in a
dynamic manner based on the primary system information.
The dynamic manner may be based upon at least one of frequency, time, and size of
the non-primary system information. The primary system information may include
scheduling information that indicates at least one of a time characteristic and a
frequency characteristic of the non-primary system information. The primary system
information may further comprise an indicator for indicating a particular terminal. The
time characteristic and the frequency characteristic may indicate a location of each
non-primary system information to be read by the particular terminal. The indicator
may comprise: at least one of a terminal identifier, a service identifier, and a logical
channel identifier. The non-primary system information may relate to control in-
formation. The control information may be used to read actual data. The time char-
acteristic may relate to symbols, and the frequency information relates to sub-carriers.
The non-primary information is in the form of at least one resource block. The primary
system information may be in the form of a master information block (MB), and the
non-primary system information is in the form of a system information block (SIB).
The MEB also contains size information of an SIB.
Also, the present invention provides a method for processing (downlink) system in-
formation for a network, the method comprising: transmitting primary system in-
formation in a static manner; and transmitting non-primary system information in a
dynamic manner based on the primary system information.
The dynamic manner may be based upon at least one of frequency, time, and size of
the non-primary system information. The primary system information may include
scheduling information that indicates at least one of a time characteristic and a
frequency characteristic of the non-primary system information. The primary system
information may further comprise an indicator for indicating a particular terminal. The
time characteristic and the frequency characteristic may indicate a location of each
non-primary system information to be read by the particular terminal. The indicator
may comprise: at least one of a terminal identifier, a service identifier, and a logical
channel identifier. The non-primary system information may relate to control in-
formation. The control information may be used to read actual data. The time char-
acteristic relates to symbols, and the frequency information may relate to sub-carriers.
The non-primary information may be in the form of at least one resource block. The
primary system information may be in the form of a master information block (MIB),
and the non-primary system information is in the form of a system Information block
(SIB). The MIB may also contain size information of an SIB.
Additionally, the present invention provides a frame structure used for processing
system information, the structure comprising: a first sub-frame containing static
primary system information; and one or more subsequent sub-frames containing at
least one dynamic non-primary system information, wherein the static primary system
information includes scheduling information that indicates time and frequency in-
formation of the non-primary system information.
The static primary system information may further comprise an indicator for
indicating a particular terminal. The time and frequency information may indicate a
location of each dynamic non-primary system information to be read by the particular
terminal. The indicator may comprise: at least one of a terminal identifier, a service
identifier, and a logical channel identifier. The non-primary system information may
relate to control information. The control information may be used to read actual data.
The time information may relate to symbols, and the frequency information relates to
sub-carriers. The dynamic non-primary information may be in the form of at least one
resource block. The static primary system information may be in the form of a master
information block (MIB), and the dynamic non-primary system information is in the
form of a system information block (SIB). The MIB may also contain size information
of an SIB. The non-primary system information may comprise control information that
includes separate information for idle mode and active mode operation of a mobile
terminal.
This specification describes various illustrative embodiments of the present
invention. The scope of the claims is intended to cover various modifications and
equivalent arrangements of the illustrative embodiments disclosed in the specification.
Therefore, the following claims should be accorded the reasonably broadest inter-
pretation to cover modifications, equivalent structures, and features that are consistent
with the spirit and scope of the invention disclosed herein.
Claims
A method for processing system information for a mobile terminal, the method
comprising:
receiving primary system information in a static manner; and
receiving non-primary system information in a dynamic manner based on the
primary system information.
The method of claim 1, wherein the dynamic manner is based upon at least one
of frequency, time, and size of the non-primary system information.
The method of claim 1, wherein the primary system information includes
scheduling information that indicates at least one of a time characteristic and a
frequency characteristic of the non-primary system information.
The method of claim 3, wherein the time characteristic and the frequency char-
acteristic indicate a location of the non-primary system information to be read by
the particular terminal.
The method of claim 4, wherein the primary system information further
comprises an indicator for indicating a particular terminal.
The method of claim 5, wherein the indicator comprises: at least one of a
terminal identifier, a service identifier, and a logical channel identifier.
The method of claim 1, wherein the non-primary system information relates to
control information.
The method of claim 7, wherein the control information is used to read actual
data.
The method of claim 3, wherein the time characteristic relates to symbols and the
frequency characteristic relates to sub-carriers.
The method of claim 1, wherein the non-primary system information is in the
form of at least one resource block.
The method of claim 1, wherein the primary system information is in the form of
a master information block (MIB) and the non-primary system information is in
the form of a system information block (SIB).
The method of claim 11, wherein the MIB also contains size information of an
SIB.
A method for processing system information for a network, the method
comprising:
transmitting primary system information in a static manner; and
transmitting non-primary system information in a dynamic manner based on the
primary system information.
The method of claim 13, wherein the dynamic manner is based upon at least one
of frequency, time, and size of the non-primary system information.
The method of claim 13, wherein the primary system information includes
scheduling information that indicates at least one of a time characteristic and a
frequency characteristic of the non-primary system information.
The method of claim 15, wherein the primary system information further
comprises an indicator for indicating a particular terminal.
The method of claim 16, wherein the time characteristic and the frequency char-
acteristic indicate a location of the non-primary system information to be read by
the particular terminal.
The method of claim 16, wherein the indicator comprises: at least one of a
terminal identifier, a service identifier, and a logical channel identifier.
The method of claim 13, wherein the non-primary system information relates to
control information.
The method of claim 18, wherein the control information is used to read actual
data.
The method of claim 15, wherein the time characteristic relates to symbols and
the frequency characteristic relates to sub-carriers.
The method of claim 13, wherein the non-primary system information is in the
form of at least one resource block.
The method of claim 13, wherein the primary system information is in the form
of a master information block (MEB) and the non-primary system information is
in the form of a system information block (SIB).
The method of claim 13, wherein the MIB also contains size information of an
SIB.
A frame structure used for processing system information, the structure
comprising:
a first sub-frame containing static primary system information; and
one or more subsequent sub-frames containing at least one dynamic non-primary
system information,
wherein the static primary system information includes scheduling information
that indicates time and frequency information of the non-primary system in-
formation.
The structure of claim 25, wherein the static primary system information further
comprises an indicator for indicating a particular terminal.
The structure of claim 26, wherein the time and frequency information indicates
a location of each dynamic non-primary system information to be read by the
particular terminal.
The structure of claim 26, wherein the indicator comprises: at least one of a
terminal identifier, a service identifier, and a logical channel identifier.
The structure of claim 25, wherein the non-primary system information relates to
control information.
The structure of claim 29, wherein the control information is used to read actual
data.
The structure of claim 25, wherein the time information relates to symbols, and
the frequency information relates to sub-carriers.
The structure of claim 25, wherein the dynamic non-primary information is in the
form of at least one resource block.
The structure of claim 25, wherein the static primary system information is in the
form of a master information block (MIB), and the dynamic non-primary system
information is in the form of a system information block (SIB).
The structure of claim 33, wherein the MIB also contains size information of an
SIB.
The structure of claim 25, wherein the non-primary system information
comprises control information that includes separate information for idle mode
and active mode operation of a mobile terminal.

In a wireless mobile communications system, a method for processing control information allows the operations of a mobile terminal to be simplified and permits efficient use of resources for the mobile terminal. The network instructs in advance,
the transmission of control information, such as system information and the like, via a single indicator channel. The mobile terminal
receives this single indicator channel and uses the indicator information that was transmitted via the indicator channel in order to
receive the control information.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=b5KGYATkyyQZKGinijwL/w==&loc=wDBSZCsAt7zoiVrqcFJsRw==

« Previous Patent

Next Patent »

Patent Number

271071

Indian Patent Application Number

1326/KOLNP/2008

PG Journal Number

06/2016

Publication Date

05-Feb-2016

Grant Date

31-Jan-2016

Date of Filing

02-Apr-2008

Name of Patentee

LG ELECTRONICS INC.

Applicant Address

20 YOIDO-DONG, YONGDUNGPO-GU SEOUL 150-010

Inventors:

#	Inventor's Name	Inventor's Address
1	LEE, YOUNG-DAE	SINAN APT. 419-1501, CHANGU-DONG, HANAM, GYEONGGI-DO 465-120
2	JUNG, MYUNG-CHEUL	2/2, 358-36, SANGDO 2-DONG, DONGJAK-GU, SEOUL 156-832
3	PARK, SUNG-JUN	GOLDENVILLE OFFICETEL 921, 724, GOJAN-DONG, DANWON-GU, ANSAN, GYEONGGI-DO 425-020
4	FISCHER, PATRICK	7BIS RUE ANDRE THEURIET, 92340 BOURG LA REINE
5	CHUN, SUNG-DUCK	SAETBYEOL HANYANG APT. 601-1007, DARAN-DONG, DONGAN-GU, ANYANG, GYEONGGI-DO 341-719

PCT International Classification Number

H04L 12/28

PCT International Application Number

PCT/KR2006/004370

PCT International Filing date

2006-10-25

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	60/732288	2005-10-31	U.S.A.
2	102005-0103510	2005-10-31	U.S.A.
3	102006-0063139	2006-07-05	U.S.A.
4	60/732080	2005-10-31	U.S.A.