Title of Invention	GROUPING OF USER TERMINAL CELL ACCESS INFORMATION IN A SYSTEM INFORMATION BLOCK
Abstract	Disclosed is a method for generating and transmitting system information in a mobile radio cell. In said method, system information is grouped into several information frames, information required for a mobile user device in order to verify if said mobile user device has access to the mobile radio cell being grouped into a single information frame, and the information frames are fed to the data securing layer by the network layer and are transmitted by means of the physical layer.

Title of Invention

GROUPING OF USER TERMINAL CELL ACCESS INFORMATION IN A SYSTEM INFORMATION BLOCK

Abstract

Disclosed is a method for generating and transmitting system information in a mobile radio cell. In said method, system information is grouped into several information frames, information required for a mobile user device in order to verify if said mobile user device has access to the mobile radio cell being grouped into a single information frame, and the information frames are fed to the data securing layer by the network layer and are transmitted by means of the physical layer.

Full Text	GROUPING OF USER TERMINAL CELL ACCESS INFORMATION IN A SYSTEM INFORMATION BLOCK The invention relates to a method for generating and transmitting system information, a network device, a method for verifying if a mobile radio user device is provided with access to a mobile radio cell, a mobile radio user device and a method for determining valid system information. A base station of a cellular mobile radio communication network transmits, in a mobile radio cell, system information which enables the mobile radio user devices located in the mobile radio cell to use the mobile radio communication network. Efficient methods for transmitting this system information are desirable. A method for generating and transmitting system information in a mobile radio cell is provided, in which method system information is grouped to form several information blocks, the information required for a mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell being grouped into a single one of the information blocks, at least one information message is formed from the information blocks, the information message is supplied to a unit of the data link layer by a unit of the network layer and the unit of the data link layer transmits the information message by means of at least one unit of the physical layer. Figure 1 shows a communication system according to an exemplary embodiment of the invention. Figure 2 shows a data flowchart. Figure 3 shows a system information block according to an exemplary embodiment of the invention. Figure 4 shows a data structure according to an exemplary embodiment of the invention. Figure 5 shows a sequence diagram according to an exemplary embodiment of the invention. Figure 6 shows a data flowchart according to an exemplary embodiment of the invention. In cellular mobile radio communication systems such as, for example, mobile radio communication systems according to the GSM (Global System for Mobile Communications) standard or the UMTS (Universal Mobile Telecommunications System) standard, important system information of a mobile radio cell, that is to say system information which is required for operating a mobile radio user device in the mobile radio cell, is conveyed by broadcasting from a base station which operates the mobile radio cell to all mobile radio user devices which are located in the mobile radio cell. This system information is, for example, network operator-specific information such as the identity of the mobile radio network to which the mobile radio cell belongs, for example a PLMN (Public Land Mobile Network) identity, and the identity of the mobile radio cell (cell identity) or other information which is suitable for an unambiguous configuration of mobile radio network and/or mobile radio cells. According to an exemplary embodiment of the invention, a method for generating and transmitting system information in a mobile radio cell is provided, in which method system information is grouped to form several information blocks, the information required for a mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell being grouped into a single one of the information blocks, at least one information message is formed from the information blocks, the information message is supplied to a unit of the data link layer by a unit of the network layer and the unit of the data link layer transmits the information message by means of at least one unit of the physical layer. According to a further exemplary embodiment of the invention, a method for verifying if a mobile radio user device is provided with access to a mobile radio cell is provided in which method it is determined in which information block of a multiplicity of information blocks transmitted in the mobile radio cell the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is transmitted, the information block is received before other information blocks of the multiplicity of information blocks are received, and it is verified if access to the mobile radio cell is provided for the mobile radio user device before other information blocks of the multiplicity of information blocks are received. According to other exemplary embodiments of the invention, a network device and a mobile radio user device according to the method, described above, for generating and transmitting system information in a mobile radio cell and respectively the method, described above, for verifying if a mobile radio user device is provided with access to a mobile radio cell are provided. To illustrate, all of the system information needed by a mobile radio user device for being able to decide whether it can successfully register in a mobile radio cell, that is to say all suitability information of the system information, is grouped to form one information block. In this manner, it is only necessary that the mobile radio user device reads in this information block in order to be able to decide whether it should attempt to register in the mobile radio cell. Compared with the procedure of conveying the suitability information in different information blocks, the reception of the suitability information and thus the deciding whether a mobile radio cell is suitable for a registration can be accelerated. This makes it possible to reduce the time needed by a mobile radio user device for finding a mobile radio cell in which it can register. Finally, the mobile radio user device can successfully register in a mobile radio cell after a shorter time and set up a communication link to a base station. According to another exemplary embodiment of the invention, a method for determining valid system information by a mobile radio user device is provided, in which method an configuration transmitted in a mobile radio cell is received which identifies a set of information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell, which set of information is currently valid in the mobile radio cell, and in the case where the set of information is stored, it is verified by means of the stored set of information if the mobile radio user device is provided with access to the mobile radio cell. In this manner, it is not necessary that the mobile radio user device receives information but can use the stored information which leads to a further gain in time. A stored set of information can also be marked with a validity period which specifies until when it is valid for the configuration, in other words is identified by this configuration. In this case, the stored set of information is used for verifying if the mobile radio user device is provided with access to the mobile radio cell only when the set of information is still valid for the configuration. The configuration can be transmitted, for example, in a master information block (MIB). To illustrate, it can be signaled in a master information block which (possibly) stored set of information is currently valid in the mobile radio cell. The mobile radio cell is a mobile radio cell of a mobile radio network which is configured, for example, in accordance with the UMTS standard, the GSM standard, the CDMA2000 (Code Division Multiple Access) standard or the FOMA (Freedom of Mobile Access) standard. The information message is, for example, a PDU (Packet Data Unit) which is supplied to the RLC layer from the RRC layer. The information message is a system information message in one embodiment. Exemplary embodiments of the invention can be implemented both in software, hardware and mixed form (that is to say partially software, partially hardware) . The further embodiments of the invention which are described in conjunction with the method for generating and transmitting system information in a mobile radio cell correspondingly also apply to the method for verifying if a mobile radio user device is provided with access to a mobile radio cell, to the mobile radio user device and to the method for determining valid system information. The information blocks are, for example, a master information block (or several master information blocks) or system information blocks. The information block, into which the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, is, for example, a master information block. The information block, into which the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, can also be a system information block. The unit of the data link layer is, for example, a unit of the RLC (Resource Link Control) layer and the unit of the network layer is, for example, a unit of the RRC (Radio Resource Control) layer. In one embodiment, the information block, into which the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, does not contain any other information. Since the information block is thus reduced to its minimum size, it can be read in very rapidly as part of a verification if the mobile radio cell is suitable for a registration. The system information is transmitted, for example, by a base station which operates the mobile radio cell. The unit of the data link layer is arranged, for example, in the base station. The unit of the network layer can also be arranged in the base station. In one embodiment, the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is associated with an configuration, which enables the mobile radio user device to verify if it has already stored the information and which signals that the information identified by the configuration is currently valid in the mobile radio cell. For example, the configuration is inserted into the information block into which the information required for the mobile radio device in order to verify if said user device is provided with access to the mobile radio cell is grouped. The information can also be provided with validity- period information which specifies how long the configuration for the information is valid. This prevents the possible configurations available (for example from 0 to 63, that is to say 6 bits) from being issued completely to sets of information and new sets of information can no longer be provided with an configuration. Figure 1 shows a communication system 100 according to an exemplary embodiment of the invention. The communication system 100 has the architecture of a UMTS radio network, which is also called UMTS Terrestrial Radio Access Network (UTRAN). The communication system 100 has a multiplicity of radio network subsystems (RNS) 101, 102 which are in each case coupled to the UMTS core network 105 by means of an Iu interface 103, 104. The RNS 101, 102 in each case has a radio network controller (RNC) 107, 108 and one or more base stations 109, 110, 111, 112. A UMTS base station is also called node B. The RNCs 107, 108 of different RNS 101, 102 are coupled to one another by means of an Iur interface 113. Each base station 109, 110, 111, 112 of an RNS 101, 102 is coupled to the RNC 107, 108 of the RNS 101, 102 by means of an Iub interface 126, 127, 128, 129. Each base station 109, 110, 111, 112 of an RNS 101, 102 operates one or more mobile radio cells (CE) 114 to 125 within the RNS 101, 102 by radio engineering means. The RNC 107, 108 of an RNS 101, 102 monitors the allocation of radio resources of the mobile radio cells 114 to 125 in the RNS 101, 102. Between a base station 109, 110, 111, 112 and a mobile radio user device (user equipment, UE) 106 in a mobile radio cell 114 to 125, information signals and data signals are transmitted by means of radio transmission technology by means of an air interface (Uu) 13 0. For example, a separate signal transmission in the uplink direction and downlink direction is achieved by a corresponding separate assignment of frequencies or frequency ranges in the FDD (Frequency Division Duplex) mode. Uplink is understood to be the signal transmission from the mobile radio user device 106 to a base station 109, 110, 111, 112 and downlink is understood to be the signal transmission from a base station 109, 110, 111, 112 to the mobile radio user device 106. The signals to different mobile radio user devices and from different mobile radio user devices in the same mobile radio cell are separated, for example, by means of orthogonal codes, for example by means of the so-called CDMA (Code Division Multiple Access) method. In the mobile radio cells 114 to 125, system information relating to the operation of mobile radio user devices in the respective mobile radio cell are transmitted by means of the logical broadcast control channel (BCCH). The logical BCCH channel is mapped onto the transport channel BCH (Broadcast Channel) and physically transmitted by means of the physical channel P-CCPCH (Primary Common Control Physical Channel) by means of the air interface. This is illustrated in figure 2. Figure 2 shows a data flowchart 200. System information bits are transmitted to system information blocks 203 of in each case 246 bits by means of the BCCH 201 and the BCH 202. The system information blocks 203 are transmitted to the physical layer for sending out by means of the physical channel P-CCPCH 204 and are supplemented with a word, for example of 26 bits length, for error recognition according to the CRC (Cyclic Redundancy Check). The information bits and the bits appended for error recognition are jointly channel-coded in the physical layer, modulated and spread with a CDMA code, known throughout the system, with the spreading factor SF = 256. Since a fixed transmission time interval (TTI) of 20 ms is defined (TTI = 20 ms) for the BCH, the channel-coded bits are broadcast by means of two P-CCPCH transmit frames 205 in two blocks with in each case a length of 20 ms by means of the air interface in the respective mobile radio cell. The format of the system information blocks 203 will be explained with reference to figure 3 in the text which follows. Figure 3 shows a system information block (SIB) 300 according to an exemplary embodiment of the invention. The system information block 3 00 has a system frame number (SFN) 301 which consists of 12 bits. The system frame number is followed by SIB data 3 02 which contains system information and consists of 234 bits. The system frame number 301 specifies the timing used in the respective mobile radio cell and is used for synchronization between base station and mobile radio user device. The system information block in which certain system information is transmitted is decided on the basis of the type of system information. Apart from the system information blocks, master information blocks (MIB) and scheduling blocks (SB) are also transmitted, in the present exemplary embodiment in the same way as has been explained with reference to figure 2 for the system information blocks. In a master information block, for example, the PLMN identify of the mobile radio network is transmitted, and scheduling information with respect to the transmission of the system information blocks. In the scheduling blocks, scheduling information with respect to the system information blocks is also signaled. In a UMTS mobile radio network, 18 types of system information blocks are defined. The allocation of certain system information to system information blocks, that is to say the allocation of which system information block contains which system information, is as follows, for example: SIB 1 contains information about the UMTS core network and information on configuration of system-related timers and constants. SIB 3 contains parameter values which are required for selecting mobile radio cells and for the change of mobile radio cell by a mobile radio user device. SIB 5 contains information about the configuration of the common physical radio resources for mobile radio user devices which are in rest mode (ideal mode). SIB 6 contains information on the configuration of the common physical radio resources for mobile radio user devices which are in connected mode. SIB 11 contains information for carrying out measurements. In the system information block with the number 16, parameters of the so-called "predefined configurations" are transmitted which have radio bearer parameters, transport channel parameters and physical channel parameters. When a signaling connection is set up, a mobile radio user device signals to the UMTS radio access network (UTRAN) an item of information called "predefined configuration value tag". This signals to the mobile radio network that the mobile radio user device has stored the "predefined configurations" contained in the system information block having the number 16. In the RRC connection setup message, the UMTS radio access network signals to the mobile radio user device which predefined configuration is to be used, in the form of the so-called "predefined configuration identity". From UMTS in Version Release 5 onward, an analogous procedure is also possible for the "radio bearer reconfiguration" procedure. Furthermore, default configurations can be provided for RAB (Radio Access Bearer) and signaling connections. These default configurations are permanently stored in mobile radio user devices. Instead of a complete list of parameters for setting up an RAB or a signaling connection, the UMTS radio access network can transmit to a mobile radio user device a so-called "default configuration identity" which specifies a default configuration (this is possible from UMTS in Version Release 6 onward). Default configurations are used for the "Handover to UTRAN" procedure in UMTS in Version R99 (Release 1999) and for the "RRC Connection Setup" and "Radio Bearer Reconfiguration" procedures in UMTS in Version Release 5. So that a mobile radio user device can correctly use a mobile radio network, it ensures that it has received the current system information in the mobile radio cell in which it is located. If the amount of system information which must be read in is very large, however, the reception and the reading in of the system information is correspondingly time-intensive for the mobile radio user devices. This is of disadvantage particularly in the case of the system information which specifies whether a mobile radio cell is suitable for a mobile radio user device, which will be called suitability information in the text which follows. Reading in the suitability information is necessary for a mobile radio user device whenever it would like to change to another mobile radio cell (cell reselection) and when the mobile radio user device is switched on. According to one exemplary embodiment of the invention, all suitability information is transmitted in the master information block so that the reading in of the suitability information can be carried out efficiently and rapidly. In one embodiment, apart from the suitability information, no other information is transmitted in the master information block. All scheduling information is transmitted in the scheduling blocks. The size of the master information block can be reduced in this manner and the time required for reading in the master information block can be correspondingly reduced. The suitability information is, for example: the PLMN identity, that is to say an configuration of the mobile radio network to which the mobile radio cell belongs the LAC (Local Area Code) , that is to say a code of the mobile radio network Qqualmin, an item of information on the minimum quality level required in the mobile radio cell in decibels Qrxlevmin, an item of information of the minimum receiver level in the mobile radio cell in dBm an item of information on the maximum permissible transmitting power on the uplink cell barred information, for example a cell bar bit, which indicates if the mobile radio cell is barred for mobile radio user devices (for example mobile radio user devices without particular privileges), an intrafrequency cell reselection indicator which specifies if the mobile radio user device can dial into the mobile radio cell by using the same frequency as in the mobile radio cell previously used by the mobile radio user device the value of the Tfc,arred parameter, which specifies how long a mobile radio user device should remove the mobile radio cell from its list of adjacent mobile radio cells when the mobile radio cell is identified as barred the information regarding if the mobile radio cell is reserved for use by the operator of the mobile radio network (cell reserved for operator use) an item of information regarding if the mobile radio cell is reserved for a future extension of the mobile radio network (cell reservation extension). As mentioned, the suitability information is transmitted, for example, in the master information block. The master information block is correspondingly arranged, for example in accordance with Table 1. Other information which is transmitted in the master information block in conventional mobile radio communication networks is transmitted by means of the scheduling blocks or by means of system information blocks in one exemplary embodiment. For example, all scheduling information which relates to system information blocks and which have been transmitted in the master block in conventional mobile radio networks are transmitted by means of the scheduling blocks in one exemplary embodiment. According to a further exemplary embodiment of the invention, the entire suitability information is transmitted within a system information block which is sent, for example, in fixed time association with the master information block. This means that it is specified after how much time after transmission of the master information block the system information block is sent out by the base station. For example, the system information block is always sent out by means of a time frame of 10 ms in length which follows a time frame in which the master information block has been sent out. In another exemplary embodiment of the invention, default values are used for the system information. This means that a mobile radio user device stores default configurations (stored configurations), that is to say possible values for the system information, for example possible arrangements of system information blocks, the possible system information being provided with an configuration, for example with a stored configuration ID, for example a number between 1 and N. According to one exemplary embodiment of the invention, this is applied for the suitability information and will be explained in greater detail with reference to figure 4 in the text which follows. Figure 4 shows a data structure 4 00 according to an exemplary embodiment of the invention. The data structure 400 is stored in a mobile radio user device and is used for storing standard configurations for the suitability information. That is to say, possible valid values for the suitability information are stored in the form of the data structure 400 in the mobile radio user device. The data structure 400 has several sets of suitability information 401. Each set of suitability information 4 01 contains values for the parameters corresponding to the suitability information, that is to say, for example, for the abovementioned parameters of the values of which the suitability information consists. The sets of suitability information specify suitability information which may be valid in a mobile radio cell. Each set of suitability information 401 is provided with a suitability information configuration 402 so that reference can be made to each set of suitability information 401. Instead of transmitting the complete suitability information to the mobile radio user device, a base station, if the suitability information, which is valid in the mobile radio cell operated by the base station corresponds to one of the sets of suitability information 401, can transmit only the suitability information configuration to the mobile radio user device in order to signal to the mobile radio user device which suitability information is valid in the mobile radio cell. For example, the date structure 400 has maximally N sets of suitability information 401. Correspondingly, the suitability information configuration has, for example, values from 1 to N. Storing default values for the suitability information, for example in the form of the data structure 400, is efficient and not very- complex compared with information which, for example, characterizes the structure of a radio bearer for a radio bearer setup. While when storing the configuration of a radio bearer (RAB configuration) with a suitable indexing, so that during the setting up of a radio bearer the configuration of a radio bearer can be rapidly accessed by using an index and thus the setting up of a radio bearer can be accelerated, a considerable complexity arises due to the high volume of data of the parameters required for describing a radio bearer, this is not the case when storing default configurations for suitability information and default values for suitability information can be administered efficiently and with little complexity. Apart from the lesser volume of data of the suitability information compared with parameters which are required for describing a radio bearer, the reason for this is that the suitability information changes less frequently compared with RAB configurations. For example, the data structure 400 is built up by the suitability information sent out by the base stations being sent out together with a suitability information configuration 402, and the mobile radio user device stores the suitability information sent out in the form of a set of suitability information 401 together with the suitability information configuration 402 in the data structure 400. In this context, the suitability information can be sent out in such a manner that the suitability information is transmitted all together in a master information block, the suitability information is transmitted all together in a system information block or the suitability information can also be transmitted distributed over several system information blocks. If a base station sends out suitability information together with a suitability information configuration, the mobile radio user device can check the data structure 4 00 and determine by means of the suitability information configurations 402 whether the suitability information sent out matches a set of suitability information 401. If this is the case, the mobile radio user device does not need to read in the suitability information but can use the stored set of suitability information. Otherwise, the mobile radio user device reads in the suitability information sent out and stores it in the data structure together with the suitability information configuration sent out. In an exemplary embodiment of the invention, default values are stored for each system information block. That is to say that, analogously to figure 4, an analogous data structure 4 00, in which sets of system information which are sent out in this system information block are stored, is provided in the mobile radio user device for each system information block. For example, a base station sends out in the master information block, for each system information block, the system information configuration (analogously to the suitability information configuration 402) which specifies which set of system information is valid for this system information block,1 in other words which version of the system information block is currently valid. Such a master configuration block is shown in Table 2. In this example, the master configuration block, similar to the master configuration block which is arranged according to Table 1, contains the suitability information in accordance with lines 5 to 14 in Table 2. Corresponding to lines 2 to 4, the master configuration block contains for each system information block the system information block configuration which specifies which set of system information is currently valid for this system information block. In this example, the system information block configurations have the values 0 to 64 (compare line 4, column 4 of Table 2) and the system information blocks are numbered through from 0 to 18 (compare line 3, column 4 of Table 2) . The ">" symbols indicate that the information, according to line 3 and line 4 of Table 4, that is to say the information of a system information block (SIB number) is stored together with the system block configuration for each system block in the form of the list of stored information (compare line 2 of Table 2). It can be provided that for each set of system information (for example set of suitability information 401) , a validity period is defined which specifies a time interval after which the set of system information from the mobile radio user device on which it is stored is considered as no longer valid. This makes it possible to avoid that, after a certain operating time of the mobile radio network, all system information configurations are issued and no more new system information sets can be stored in the mobile radio user devices or can no longer be addressed by means of a system information configuration. If, for example, the range of values of the system information configuration is 0 to 64 as in the above example, no new system information sets could be addressed unambiguously by a base station by means of a system information configuration as soon as 65 system information sets have been stored and addressed by means of the system information configuration, that is to say a set of system information which corresponds to none of the sets of system information previously addressed by means of the system information configuration could no longer be identified or addressed. By using a validity period after which the sets of system information are no longer valid, system information configurations are demonstratively released and are available for addressing new sets of system information and can be reoccupied correspondingly. The ISO (International Organization for Standardization) has defined a reference model consisting of seven layers for describing manufacturer- independent communication systems which is called ISO/OSI model. The ISO/OSI model is used for describing a communication between various network devices of different manufacturers. OSI stands for Open System Interconnection. Most of the freely usable network protocols are based on this reference model, for example TCP/IP (Transport Control Protocol/Internet Protocol). The seven levels of the ISO/OSI model are defined in such a way that they build upon one another and that units of one level can be used independently of the units of other levels. The units of levels 1 to 4 form the transport system, that is to say in levels 1 to 4 the communication channels are defined physically and logically, and the units of levels 5 to 7 form the application system and are predominantly used for representing information. The seven levels of the ISO/OSI model are designated in their order from 1 to 7 as physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer. In Table 3, the designation and examples of protocols which are used as part of the respective layer are specified for each layer. The units of the application layer provide the interface between the respective user and application programs, for example for users of email programs or data transmission services. The units of the presentation layer prepare data for use by the units of the application layer. In this context, data are decoded, for example, converted between different formats, encrypted or checked. The units of the session layer provide services which are used for organizing the data transmission. For example, it is guaranteed that communication connections can be resumed again in spite of temporary interruptions. For this purpose, tokens in data packets are used, for example. The units of the transport layer provide the possibility of setting up and clearing down communication connections in a proper manner, synchronizing communication connections and distributing to the communication connections data packets for transmission by means of several communication connections (multiplexing). The transport layer forms the interface between the transport system and the application system according to the ISO/OSI model. In addition, data packets are segmented by units of the transport layer and the congestion of data packets can be prevented. The units of the network layer handle the switching and delivery of data packets. For example, they carry out the assembly of routing tables and the routing. If data packets are only to be forwarded, they are provided with a new intermediate destination address by units of the network layer and are not forwarded to units of higher layers. The coupling of different network topologies is also carried out in the network layer. The units of the data link layer organize and monitor the access to the data transmission medium. Bit streams to be transmitted are segmented in the data link layer and combined to form packets. Furthermore, data can be subjected to an error check, for example a checksum can be appended to a data packet. A compression of data can also be carried out. Further tasks of the units of the data link layer are the sequence monitoring, the time monitoring and the flow control. The data link layer can be subdivided into two sublayers. The upper sublayer, that is to say the sublayer in the direction of the network layer, is called the logical link control (LLC) layer and the lower sublayer, that is to say the sublayer in the direction of the physical layer, is called the medium access control (MAC) layer. The functionality of the units of the MAC layer can be developed differently depending on the transmission medium used (that is to say depending on the arrangement of the physical layer). The main tasks of the MAC layer usually include: Detecting where frames in the bit stream received by the units of the physical layer start and stop (when receiving data). Dividing the data stream into frames and possibly inserting additional bits into the frame structure so that the start and the end of a frame can be detected at a receiver (when transmitting data). Finding transmission errors, for example by inserting a checksum during transmission or by corresponding control calculations during reception, respectively. Inserting and evaluating MAC addresses during transmission and during reception, respectively. Access control, that is to say when several units wish to access the physical transmission medium, deciding which of the units is granted the right of access. The physical layer relates to characteristics of the transmission medium. For example, wavelengths and signal levels to be used are defined. The units of the physical layer convert the bit sequences to be transmitted into transmittable formats. According to one exemplary embodiment of the invention, a method is provided as is shown in figure 5. Figure 5 shows a sequence diagram 50 0 according to one exemplary embodiment of the invention. The sequence diagram 500 illustrates a method for generating and transmitting system information to a mobile radio user device in a mobile radio cell. In step 501, system information is grouped to form several system information blocks, the information required for a mobile radio user device in order to verify if it is provided with access to the mobile radio cell, are grouped in a single one of the system information blocks. In step 502, at least one information message is formed from the information blocks. In step 503, the information message is supplied to a unit of the data link layer by a unit of the network layer. In step 504, the information message is sent out by the unit of the data link layer by means of at least one unit of the physical layer. In figure 6, it is illustrated which tasks are carried out in which layers according to an exemplary embodiment of the invention. Figure 6 shows a data flowchart 600 according to one exemplary embodiment of the invention. The data flow shown takes place between units of the network layer 601, of the data link layer 602 and the physical layer 603. A unit of the network layer 606, in the present exemplary embodiment a unit of the RRC (radio resource control) layer, that is to say a unit which performs tasks in the framework of the RRC protocol, groups system information 604 to form several information blocks 605. The system information 604 is generated at least partially by a unit of the RRC layer. One of the information blocks 605 contains all the information required for a mobile radio user device in order to verify if it is provided with access in the mobile radio cell in which the system information 604 is sent out, that is to say all suitability information. From the information blocks, information messages 609 are formed in the RRC layer 601, which messages are supplied to a unit of the data link layer 607, in the present example a unit of the RLC (radio link control) layer, that is to say a unit which performs tasks within the framework of the RLC protocol. The unit of the data link layer 607 supplies the information messages 609, which were supplemented with error correction bits for a possible error correction, or segmented for sending out, for example, by the unit of the data link layer 607, to a unit of the physical layer 608. The unit of the physical layer 608 sends out the information messages 609. For example, the information messages 609 are broadcast in the mobile radio cell. The information blocks 605 can be both system information blocks (SIBs) and a master information block (MIB) . The sending out of the information messages 609 by means of the unit of the physical layer 60 8, for example a physical channel, for example a broadcast channel, can also involve a unit of the MAC layer (not shown) which, for example, regulates the access to the physical channel. List of reference designations 100 Communication system 102, 102 RNS 103, 104 Iu interface 105 Core network 106 User device 107, 108 RNC 109-112 Base stations 113 Iur interface 114-125 Radio cells 126-129 Iub interface 130 Air interface 200 Data flowchart 201 BCCH 202 BCH 203 System information blocks 204 P-CCPCH 205 P-CCPCH transmit frame 3 00 System information block 3 01 System frame number 302 SIB data 400 Data structure 401 Sets of suitability information 402 Suitability information configuration 500 Sequence diagram 501-504 Sequence steps 600 Data flowchart 601 Network layer 602 Data link layer 603 Physical layer 604 System information 605 Information blocks 606 Unit of the network layer 607 Unit of the data link layer 608 Unit of the physical layer 609 Information messages Patent claims 1. A method for generating and transmitting system information in a mobile radio cell, in which method system information is grouped to form several information blocks, the information required for a mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell being grouped into a single one of the information blocks, at least one information message is formed from the information blocks, the information message is supplied to a unit of the data link layer by a unit of the network layer and the unit of the data link layer transmits the information message by means of at least one unit of the physical layer. 2. The method as claimed in claim 1, wherein the information blocks are a master information block or system information blocks. 3. The method as claimed in claim 2, wherein the information block, into which the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, is a master information block. 4. The method as claimed in claim 2, wherein the information block, into which the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, is a system information block. 5. The method as claimed in claim 1, wherein the unit of the data link layer is a unit of the RLC layer. 6. The method as claimed in claim 1, wherein the unit of the network layer is a unit of the RRC layer. 7. The method as claimed in claim 1, wherein the information block, into which the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, does not contain any other information. 8. The method as claimed in claim 1, wherein the system information is transmitted by a base station which operates the mobile radio cell. 9. The method as claimed in claim 1, wherein the unit of the data link layer is arranged in the base station. 10. The method as claimed in claim 1, wherein the unit of the network layer is arranged in the base station. 11. The method as claimed in claim 11, wherein the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is associated with an configuration, which enables the mobile radio user device to verify if it has already stored the information and which signals that the information identified by the configuration is currently valid in the mobile radio cell. 12. The method as claimed in claim 11, wherein the configuration is inserted in the information block into which the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped. 13. The method as claimed in claim 11, wherein the information is provided with validity period information which specifies how long the configuration for the information is valid. 14. A network device for generating and transmitting system information in a mobile radio cell, having a grouping device which is set up for grouping system information to form several information blocks, the information required for a mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell being grouped into a single one of the information blocks, a generating device which is set up for forming at least one information message from the information blocks, a unit of the network layer which is set up for supplying the information message to a unit of the data link layer, and the unit of the data link layer which is set up for transmitting the information message by means of at least one unit of the physical layer. 15. A method for verifying if a mobile radio user device is provided with access to a mobile radio cell, in which method it is determined into which single information block of a multiplicity of information blocks transmitted in the mobile radio cell the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, the information block is received before other information blocks of the multiplicity of information blocks are received, and it is verified if access to the mobile radio cell is provided for the mobile radio user device before other information blocks of the multiplicity of information blocks are received. 16. A mobile radio user device having a determining device which is set up for determining into which single information block of a multiplicity of information blocks transmitted in a mobile radio cell the information required for the mobile radio user device in order to verify if said user device is provided with access to the mobile radio cell is grouped, a receiving device which is set up for receiving the information block before other information blocks of the multiplicity of information blocks are received, a testing device which is set up for verifying if access to the mobile radio cell is provided for the mobile radio user device before other information blocks of the multiplicity of information blocks are received. Disclosed is a method for generating and transmitting system information in a mobile radio cell. In said method, system information is grouped into several information frames, information required for a mobile user device in order to verify if said mobile user device has access to the mobile radio cell being grouped into a single information frame, and the information frames are fed to the data securing layer by the network layer and are transmitted by means of the physical layer.

Full Text

GROUPING OF USER TERMINAL CELL ACCESS INFORMATION IN A
SYSTEM INFORMATION BLOCK
The invention relates to a method for generating and
transmitting system information, a network device, a
method for verifying if a mobile radio user device is
provided with access to a mobile radio cell, a mobile
radio user device and a method for determining valid
system information.
A base station of a cellular mobile radio communication
network transmits, in a mobile radio cell, system
information which enables the mobile radio user devices
located in the mobile radio cell to use the mobile
radio communication network. Efficient methods for
transmitting this system information are desirable.
A method for generating and transmitting system
information in a mobile radio cell is provided, in
which method system information is grouped to form
several information blocks, the information required
for a mobile radio user device in order to verify if
said user device is provided with access to the mobile
radio cell being grouped into a single one of the
information blocks, at least one information message is
formed from the information blocks, the information
message is supplied to a unit of the data link layer by
a unit of the network layer and the unit of the data
link layer transmits the information message by means
of at least one unit of the physical layer.
Figure 1 shows a communication system according to an
exemplary embodiment of the invention.
Figure 2 shows a data flowchart.

Figure 3 shows a system information block according to
an exemplary embodiment of the invention.
Figure 4 shows a data structure according to an
exemplary embodiment of the invention.
Figure 5 shows a sequence diagram according to an
exemplary embodiment of the invention.
Figure 6 shows a data flowchart according to an
exemplary embodiment of the invention.
In cellular mobile radio communication systems such as,
for example, mobile radio communication systems
according to the GSM (Global System for Mobile
Communications) standard or the UMTS (Universal Mobile
Telecommunications System) standard, important system
information of a mobile radio cell, that is to say
system information which is required for operating a
mobile radio user device in the mobile radio cell, is
conveyed by broadcasting from a base station which
operates the mobile radio cell to all mobile radio user
devices which are located in the mobile radio cell.
This system information is, for example, network
operator-specific information such as the identity of
the mobile radio network to which the mobile radio cell
belongs, for example a PLMN (Public Land Mobile
Network) identity, and the identity of the mobile radio
cell (cell identity) or other information which is
suitable for an unambiguous configuration of mobile
radio network and/or mobile radio cells.
According to an exemplary embodiment of the invention,
a method for generating and transmitting system
information in a mobile radio cell is provided, in
which method system information is grouped to form
several information blocks, the information required
for a mobile radio user device in order to verify if
said user device is provided with access to the mobile

radio cell being grouped into a single one of the
information blocks, at least one information message is
formed from the information blocks, the information
message is supplied to a unit of the data link layer by
a unit of the network layer and the unit of the data
link layer transmits the information message by means
of at least one unit of the physical layer.
According to a further exemplary embodiment of the
invention, a method for verifying if a mobile radio
user device is provided with access to a mobile radio
cell is provided in which method it is determined in
which information block of a multiplicity of
information blocks transmitted in the mobile radio cell
the information required for the mobile radio user
device in order to verify if said user device is
provided with access to the mobile radio cell is
transmitted, the information block is received before
other information blocks of the multiplicity of
information blocks are received, and it is verified if
access to the mobile radio cell is provided for the
mobile radio user device before other information
blocks of the multiplicity of information blocks are
received.
According to other exemplary embodiments of the
invention, a network device and a mobile radio user
device according to the method, described above, for
generating and transmitting system information in a
mobile radio cell and respectively the method,
described above, for verifying if a mobile radio user
device is provided with access to a mobile radio cell
are provided.
To illustrate, all of the system information needed by
a mobile radio user device for being able to decide
whether it can successfully register in a mobile radio
cell, that is to say all suitability information of the
system information, is grouped to form one information

block. In this manner, it is only necessary that the
mobile radio user device reads in this information
block in order to be able to decide whether it should
attempt to register in the mobile radio cell.
Compared with the procedure of conveying the
suitability information in different information
blocks, the reception of the suitability information
and thus the deciding whether a mobile radio cell is
suitable for a registration can be accelerated. This
makes it possible to reduce the time needed by a mobile
radio user device for finding a mobile radio cell in
which it can register. Finally, the mobile radio user
device can successfully register in a mobile radio cell
after a shorter time and set up a communication link to
a base station.
According to another exemplary embodiment of the
invention, a method for determining valid system
information by a mobile radio user device is provided,
in which method an configuration transmitted in a
mobile radio cell is received which identifies a set of
information required for the mobile radio user device
in order to verify if said user device is provided with
access to the mobile radio cell, which set of
information is currently valid in the mobile radio
cell, and in the case where the set of information is
stored, it is verified by means of the stored set of
information if the mobile radio user device is provided
with access to the mobile radio cell.
In this manner, it is not necessary that the mobile
radio user device receives information but can use the
stored information which leads to a further gain in
time. A stored set of information can also be marked
with a validity period which specifies until when it is
valid for the configuration, in other words is
identified by this configuration. In this case, the
stored set of information is used for verifying if the

mobile radio user device is provided with access to the
mobile radio cell only when the set of information is
still valid for the configuration. The configuration
can be transmitted, for example, in a master
information block (MIB). To illustrate, it can be
signaled in a master information block which (possibly)
stored set of information is currently valid in the
mobile radio cell.
The mobile radio cell is a mobile radio cell of a
mobile radio network which is configured, for example,
in accordance with the UMTS standard, the GSM standard,
the CDMA2000 (Code Division Multiple Access) standard
or the FOMA (Freedom of Mobile Access) standard.
The information message is, for example, a PDU (Packet
Data Unit) which is supplied to the RLC layer from the
RRC layer. The information message is a system
information message in one embodiment.
Exemplary embodiments of the invention can be
implemented both in software, hardware and mixed form
(that is to say partially software, partially
hardware) .
The further embodiments of the invention which are
described in conjunction with the method for generating
and transmitting system information in a mobile radio
cell correspondingly also apply to the method for
verifying if a mobile radio user device is provided
with access to a mobile radio cell, to the mobile radio
user device and to the method for determining valid
system information.
The information blocks are, for example, a master
information block (or several master information
blocks) or system information blocks.

The information block, into which the information
required for the mobile radio user device in order to
verify if said user device is provided with access to
the mobile radio cell is grouped, is, for example, a
master information block. The information block, into
which the information required for the mobile radio
user device in order to verify if said user device is
provided with access to the mobile radio cell is
grouped, can also be a system information block.
The unit of the data link layer is, for example, a unit
of the RLC (Resource Link Control) layer and the unit
of the network layer is, for example, a unit of the RRC
(Radio Resource Control) layer.
In one embodiment, the information block, into which
the information required for the mobile radio user
device in order to verify if said user device is
provided with access to the mobile radio cell is
grouped, does not contain any other information. Since
the information block is thus reduced to its minimum
size, it can be read in very rapidly as part of a
verification if the mobile radio cell is suitable for a
registration.
The system information is transmitted, for example, by
a base station which operates the mobile radio cell.
The unit of the data link layer is arranged, for
example, in the base station. The unit of the network
layer can also be arranged in the base station.
In one embodiment, the information required for the
mobile radio user device in order to verify if said
user device is provided with access to the mobile radio
cell is associated with an configuration, which
enables the mobile radio user device to verify if it
has already stored the information and which signals
that the information identified by the configuration
is currently valid in the mobile radio cell.

For example, the configuration is inserted into the
information block into which the information required
for the mobile radio device in order to verify if said
user device is provided with access to the mobile radio
cell is grouped.
The information can also be provided with validity-
period information which specifies how long the
configuration for the information is valid. This
prevents the possible configurations available (for
example from 0 to 63, that is to say 6 bits) from being
issued completely to sets of information and new sets
of information can no longer be provided with an
configuration.
Figure 1 shows a communication system 100 according to
an exemplary embodiment of the invention.
The communication system 100 has the architecture of a
UMTS radio network, which is also called UMTS
Terrestrial Radio Access Network (UTRAN).
The communication system 100 has a multiplicity of
radio network subsystems (RNS) 101, 102 which are in
each case coupled to the UMTS core network 105 by means
of an Iu interface 103, 104.
The RNS 101, 102 in each case has a radio network
controller (RNC) 107, 108 and one or more base stations
109, 110, 111, 112. A UMTS base station is also called
node B.
The RNCs 107, 108 of different RNS 101, 102 are coupled
to one another by means of an Iur interface 113.
Each base station 109, 110, 111, 112 of an RNS 101, 102
is coupled to the RNC 107, 108 of the RNS 101, 102 by
means of an Iub interface 126, 127, 128, 129. Each base

station 109, 110, 111, 112 of an RNS 101, 102 operates
one or more mobile radio cells (CE) 114 to 125 within
the RNS 101, 102 by radio engineering means. The RNC
107, 108 of an RNS 101, 102 monitors the allocation of
radio resources of the mobile radio cells 114 to 125 in
the RNS 101, 102.
Between a base station 109, 110, 111, 112 and a mobile
radio user device (user equipment, UE) 106 in a mobile
radio cell 114 to 125, information signals and data
signals are transmitted by means of radio transmission
technology by means of an air interface (Uu) 13 0. For
example, a separate signal transmission in the uplink
direction and downlink direction is achieved by a
corresponding separate assignment of frequencies or
frequency ranges in the FDD (Frequency Division Duplex)
mode. Uplink is understood to be the signal
transmission from the mobile radio user device 106 to a
base station 109, 110, 111, 112 and downlink is
understood to be the signal transmission from a base
station 109, 110, 111, 112 to the mobile radio user
device 106. The signals to different mobile radio user
devices and from different mobile radio user devices in
the same mobile radio cell are separated, for example,
by means of orthogonal codes, for example by means of
the so-called CDMA (Code Division Multiple Access)
method.
In the mobile radio cells 114 to 125, system
information relating to the operation of mobile radio
user devices in the respective mobile radio cell are
transmitted by means of the logical broadcast control
channel (BCCH). The logical BCCH channel is mapped onto
the transport channel BCH (Broadcast Channel) and
physically transmitted by means of the physical channel
P-CCPCH (Primary Common Control Physical Channel) by
means of the air interface. This is illustrated in
figure 2.

Figure 2 shows a data flowchart 200.
System information bits are transmitted to system
information blocks 203 of in each case 246 bits by
means of the BCCH 201 and the BCH 202. The system
information blocks 203 are transmitted to the physical
layer for sending out by means of the physical channel
P-CCPCH 204 and are supplemented with a word, for
example of 26 bits length, for error recognition
according to the CRC (Cyclic Redundancy Check). The
information bits and the bits appended for error
recognition are jointly channel-coded in the physical
layer, modulated and spread with a CDMA code, known
throughout the system, with the spreading factor
SF = 256. Since a fixed transmission time interval
(TTI) of 20 ms is defined (TTI = 20 ms) for the BCH,
the channel-coded bits are broadcast by means of two
P-CCPCH transmit frames 205 in two blocks with in each
case a length of 20 ms by means of the air interface in
the respective mobile radio cell.
The format of the system information blocks 203 will be
explained with reference to figure 3 in the text which
follows.
Figure 3 shows a system information block (SIB) 300
according to an exemplary embodiment of the invention.
The system information block 3 00 has a system frame
number (SFN) 301 which consists of 12 bits. The system
frame number is followed by SIB data 3 02 which contains
system information and consists of 234 bits. The system
frame number 301 specifies the timing used in the
respective mobile radio cell and is used for
synchronization between base station and mobile radio
user device.
The system information block in which certain system
information is transmitted is decided on the basis of

the type of system information. Apart from the system
information blocks, master information blocks (MIB) and
scheduling blocks (SB) are also transmitted, in the
present exemplary embodiment in the same way as has
been explained with reference to figure 2 for the
system information blocks. In a master information
block, for example, the PLMN identify of the mobile
radio network is transmitted, and scheduling
information with respect to the transmission of the
system information blocks. In the scheduling blocks,
scheduling information with respect to the system
information blocks is also signaled.
In a UMTS mobile radio network, 18 types of system
information blocks are defined. The allocation of
certain system information to system information
blocks, that is to say the allocation of which system
information block contains which system information, is
as follows, for example:
SIB 1 contains information about the UMTS core
network and information on configuration of
system-related timers and constants.
SIB 3 contains parameter values which are
required for selecting mobile radio cells and
for the change of mobile radio cell by a mobile
radio user device.
SIB 5 contains information about the
configuration of the common physical radio
resources for mobile radio user devices which
are in rest mode (ideal mode).
SIB 6 contains information on the configuration
of the common physical radio resources for
mobile radio user devices which are in
connected mode.
SIB 11 contains information for carrying out
measurements.

In the system information block with the number 16,
parameters of the so-called "predefined configurations"
are transmitted which have radio bearer parameters,
transport channel parameters and physical channel
parameters. When a signaling connection is set up, a
mobile radio user device signals to the UMTS radio
access network (UTRAN) an item of information called
"predefined configuration value tag". This signals to
the mobile radio network that the mobile radio user
device has stored the "predefined configurations"
contained in the system information block having the
number 16. In the RRC connection setup message, the
UMTS radio access network signals to the mobile radio
user device which predefined configuration is to be
used, in the form of the so-called "predefined
configuration identity". From UMTS in Version Release 5
onward, an analogous procedure is also possible for the
"radio bearer reconfiguration" procedure.
Furthermore, default configurations can be provided for
RAB (Radio Access Bearer) and signaling connections.
These default configurations are permanently stored in
mobile radio user devices. Instead of a complete list
of parameters for setting up an RAB or a signaling
connection, the UMTS radio access network can transmit
to a mobile radio user device a so-called "default
configuration identity" which specifies a default
configuration (this is possible from UMTS in Version
Release 6 onward). Default configurations are used for
the "Handover to UTRAN" procedure in UMTS in Version
R99 (Release 1999) and for the "RRC Connection Setup"
and "Radio Bearer Reconfiguration" procedures in UMTS
in Version Release 5.
So that a mobile radio user device can correctly use a
mobile radio network, it ensures that it has received
the current system information in the mobile radio cell
in which it is located. If the amount of system
information which must be read in is very large,

however, the reception and the reading in of the system
information is correspondingly time-intensive for the
mobile radio user devices. This is of disadvantage
particularly in the case of the system information
which specifies whether a mobile radio cell is suitable
for a mobile radio user device, which will be called
suitability information in the text which follows.
Reading in the suitability information is necessary for
a mobile radio user device whenever it would like to
change to another mobile radio cell (cell reselection)
and when the mobile radio user device is switched on.
According to one exemplary embodiment of the invention,
all suitability information is transmitted in the
master information block so that the reading in of the
suitability information can be carried out efficiently
and rapidly. In one embodiment, apart from the
suitability information, no other information is
transmitted in the master information block. All
scheduling information is transmitted in the scheduling
blocks. The size of the master information block can be
reduced in this manner and the time required for
reading in the master information block can be
correspondingly reduced.
The suitability information is, for example:
the PLMN identity, that is to say an
configuration of the mobile radio network to
which the mobile radio cell belongs
the LAC (Local Area Code) , that is to say a
code of the mobile radio network
Qqualmin, an item of information on the minimum
quality level required in the mobile radio cell
in decibels
Qrxlevmin, an item of information of the
minimum receiver level in the mobile radio cell
in dBm
an item of information on the maximum
permissible transmitting power on the uplink

cell barred information, for example a cell bar
bit, which indicates if the mobile radio cell
is barred for mobile radio user devices (for
example mobile radio user devices without
particular privileges),
an intrafrequency cell reselection indicator
which specifies if the mobile radio user device
can dial into the mobile radio cell by using
the same frequency as in the mobile radio cell
previously used by the mobile radio user device
the value of the Tfc,arred parameter, which
specifies how long a mobile radio user device
should remove the mobile radio cell from its
list of adjacent mobile radio cells when the
mobile radio cell is identified as barred
the information regarding if the mobile radio
cell is reserved for use by the operator of the
mobile radio network (cell reserved for
operator use)
an item of information regarding if the mobile
radio cell is reserved for a future extension
of the mobile radio network (cell reservation
extension).
As mentioned, the suitability information is
transmitted, for example, in the master information
block. The master information block is correspondingly
arranged, for example in accordance with Table 1. Other
information which is transmitted in the master
information block in conventional mobile radio
communication networks is transmitted by means of the
scheduling blocks or by means of system information
blocks in one exemplary embodiment. For example, all
scheduling information which relates to system
information blocks and which have been transmitted in
the master block in conventional mobile radio networks
are transmitted by means of the scheduling blocks in
one exemplary embodiment.

According to a further exemplary embodiment of the
invention, the entire suitability information is
transmitted within a system information block which is
sent, for example, in fixed time association with the
master information block. This means that it is
specified after how much time after transmission of the
master information block the system information block
is sent out by the base station.
For example, the system information block is always
sent out by means of a time frame of 10 ms in length
which follows a time frame in which the master
information block has been sent out.
In another exemplary embodiment of the invention,
default values are used for the system information.
This means that a mobile radio user device stores
default configurations (stored configurations), that is
to say possible values for the system information, for
example possible arrangements of system information
blocks, the possible system information being provided
with an configuration, for example with a stored
configuration ID, for example a number between 1 and N.
According to one exemplary embodiment of the invention,
this is applied for the suitability information and
will be explained in greater detail with reference to
figure 4 in the text which follows.

Figure 4 shows a data structure 4 00 according to an
exemplary embodiment of the invention.
The data structure 400 is stored in a mobile radio user
device and is used for storing standard configurations
for the suitability information. That is to say,
possible valid values for the suitability information
are stored in the form of the data structure 400 in the
mobile radio user device.
The data structure 400 has several sets of suitability
information 401. Each set of suitability information
4 01 contains values for the parameters corresponding to
the suitability information, that is to say, for
example, for the abovementioned parameters of the
values of which the suitability information consists.
The sets of suitability information specify suitability
information which may be valid in a mobile radio cell.
Each set of suitability information 401 is provided
with a suitability information configuration 402 so
that reference can be made to each set of suitability
information 401.
Instead of transmitting the complete suitability
information to the mobile radio user device, a base
station, if the suitability information, which is valid
in the mobile radio cell operated by the base station
corresponds to one of the sets of suitability
information 401, can transmit only the suitability
information configuration to the mobile radio user
device in order to signal to the mobile radio user
device which suitability information is valid in the
mobile radio cell.
For example, the date structure 400 has maximally N
sets of suitability information 401. Correspondingly,
the suitability information configuration has, for
example, values from 1 to N. Storing default values for
the suitability information, for example in the form of

the data structure 400, is efficient and not very-
complex compared with information which, for example,
characterizes the structure of a radio bearer for a
radio bearer setup.
While when storing the configuration of a radio bearer
(RAB configuration) with a suitable indexing, so that
during the setting up of a radio bearer the
configuration of a radio bearer can be rapidly accessed
by using an index and thus the setting up of a radio
bearer can be accelerated, a considerable complexity
arises due to the high volume of data of the parameters
required for describing a radio bearer, this is not the
case when storing default configurations for
suitability information and default values for
suitability information can be administered efficiently
and with little complexity.
Apart from the lesser volume of data of the suitability
information compared with parameters which are required
for describing a radio bearer, the reason for this is
that the suitability information changes less
frequently compared with RAB configurations.
For example, the data structure 400 is built up by the
suitability information sent out by the base stations
being sent out together with a suitability information
configuration 402, and the mobile radio user device
stores the suitability information sent out in the form
of a set of suitability information 401 together with
the suitability information configuration 402 in the
data structure 400. In this context, the suitability
information can be sent out in such a manner that the
suitability information is transmitted all together in
a master information block, the suitability information
is transmitted all together in a system information
block or the suitability information can also be
transmitted distributed over several system information
blocks. If a base station sends out suitability

information together with a suitability information
configuration, the mobile radio user device can check
the data structure 4 00 and determine by means of the
suitability information configurations 402 whether the
suitability information sent out matches a set of
suitability information 401. If this is the case, the
mobile radio user device does not need to read in the
suitability information but can use the stored set of
suitability information. Otherwise, the mobile radio
user device reads in the suitability information sent
out and stores it in the data structure together with
the suitability information configuration sent out.
In an exemplary embodiment of the invention, default
values are stored for each system information block.
That is to say that, analogously to figure 4, an
analogous data structure 4 00, in which sets of system
information which are sent out in this system
information block are stored, is provided in the mobile
radio user device for each system information block.
For example, a base station sends out in the master
information block, for each system information block,
the system information configuration (analogously to
the suitability information configuration 402) which
specifies which set of system information is valid for
this system information block,1 in other words which
version of the system information block is currently
valid. Such a master configuration block is shown in
Table 2.

In this example, the master configuration block,
similar to the master configuration block which is
arranged according to Table 1, contains the suitability
information in accordance with lines 5 to 14 in
Table 2. Corresponding to lines 2 to 4, the master
configuration block contains for each system
information block the system information block
configuration which specifies which set of system
information is currently valid for this system
information block. In this example, the system
information block configurations have the values 0 to
64 (compare line 4, column 4 of Table 2) and the system
information blocks are numbered through from 0 to 18
(compare line 3, column 4 of Table 2) . The ">" symbols
indicate that the information, according to line 3 and
line 4 of Table 4, that is to say the information of a
system information block (SIB number) is stored
together with the system block configuration for each
system block in the form of the list of stored
information (compare line 2 of Table 2).
It can be provided that for each set of system
information (for example set of suitability information
401) , a validity period is defined which specifies a
time interval after which the set of system information
from the mobile radio user device on which it is stored
is considered as no longer valid. This makes it
possible to avoid that, after a certain operating time
of the mobile radio network, all system information
configurations are issued and no more new system

information sets can be stored in the mobile radio user
devices or can no longer be addressed by means of a
system information configuration.
If, for example, the range of values of the system
information configuration is 0 to 64 as in the above
example, no new system information sets could be
addressed unambiguously by a base station by means of a
system information configuration as soon as 65 system
information sets have been stored and addressed by
means of the system information configuration, that is
to say a set of system information which corresponds to
none of the sets of system information previously
addressed by means of the system information
configuration could no longer be identified or
addressed.
By using a validity period after which the sets of
system information are no longer valid, system
information configurations are demonstratively
released and are available for addressing new sets of
system information and can be reoccupied
correspondingly.
The ISO (International Organization for
Standardization) has defined a reference model
consisting of seven layers for describing manufacturer-
independent communication systems which is called
ISO/OSI model. The ISO/OSI model is used for describing
a communication between various network devices of
different manufacturers. OSI stands for Open System
Interconnection. Most of the freely usable network
protocols are based on this reference model, for
example TCP/IP (Transport Control Protocol/Internet
Protocol). The seven levels of the ISO/OSI model are
defined in such a way that they build upon one another
and that units of one level can be used independently
of the units of other levels. The units of levels 1 to
4 form the transport system, that is to say in levels 1

to 4 the communication channels are defined physically
and logically, and the units of levels 5 to 7 form the
application system and are predominantly used for
representing information. The seven levels of the
ISO/OSI model are designated in their order from 1 to 7
as physical layer, data link layer, network layer,
transport layer, session layer, presentation layer and
application layer.
In Table 3, the designation and examples of protocols
which are used as part of the respective layer are
specified for each layer.

The units of the application layer provide the
interface between the respective user and application
programs, for example for users of email programs or
data transmission services.
The units of the presentation layer prepare data for
use by the units of the application layer. In this
context, data are decoded, for example, converted
between different formats, encrypted or checked.
The units of the session layer provide services which
are used for organizing the data transmission. For
example, it is guaranteed that communication
connections can be resumed again in spite of temporary
interruptions. For this purpose, tokens in data packets
are used, for example.

The units of the transport layer provide the
possibility of setting up and clearing down
communication connections in a proper manner,
synchronizing communication connections and
distributing to the communication connections data
packets for transmission by means of several
communication connections (multiplexing). The transport
layer forms the interface between the transport system
and the application system according to the ISO/OSI
model. In addition, data packets are segmented by units
of the transport layer and the congestion of data
packets can be prevented.
The units of the network layer handle the switching and
delivery of data packets. For example, they carry out
the assembly of routing tables and the routing. If data
packets are only to be forwarded, they are provided
with a new intermediate destination address by units of
the network layer and are not forwarded to units of
higher layers. The coupling of different network
topologies is also carried out in the network layer.
The units of the data link layer organize and monitor
the access to the data transmission medium. Bit streams
to be transmitted are segmented in the data link layer
and combined to form packets. Furthermore, data can be
subjected to an error check, for example a checksum can
be appended to a data packet. A compression of data can
also be carried out. Further tasks of the units of the
data link layer are the sequence monitoring, the time
monitoring and the flow control.
The data link layer can be subdivided into two
sublayers. The upper sublayer, that is to say the
sublayer in the direction of the network layer, is
called the logical link control (LLC) layer and the
lower sublayer, that is to say the sublayer in the
direction of the physical layer, is called the medium

access control (MAC) layer. The functionality of the
units of the MAC layer can be developed differently
depending on the transmission medium used (that is to
say depending on the arrangement of the physical
layer). The main tasks of the MAC layer usually
include:
Detecting where frames in the bit stream received
by the units of the physical layer start and stop (when
receiving data).
Dividing the data stream into frames and possibly
inserting additional bits into the frame structure so
that the start and the end of a frame can be detected
at a receiver (when transmitting data).
Finding transmission errors, for example by
inserting a checksum during transmission or by
corresponding control calculations during reception,
respectively.
Inserting and evaluating MAC addresses during
transmission and during reception, respectively.
Access control, that is to say when several units
wish to access the physical transmission medium,
deciding which of the units is granted the right of
access.
The physical layer relates to characteristics of the
transmission medium. For example, wavelengths and
signal levels to be used are defined. The units of the
physical layer convert the bit sequences to be
transmitted into transmittable formats.
According to one exemplary embodiment of the invention,
a method is provided as is shown in figure 5.
Figure 5 shows a sequence diagram 50 0 according to one
exemplary embodiment of the invention.
The sequence diagram 500 illustrates a method for
generating and transmitting system information to a
mobile radio user device in a mobile radio cell.

In step 501, system information is grouped to form
several system information blocks, the information
required for a mobile radio user device in order to
verify if it is provided with access to the mobile
radio cell, are grouped in a single one of the system
information blocks.
In step 502, at least one information message is formed
from the information blocks.
In step 503, the information message is supplied to a
unit of the data link layer by a unit of the network
layer.
In step 504, the information message is sent out by the
unit of the data link layer by means of at least one
unit of the physical layer.
In figure 6, it is illustrated which tasks are carried
out in which layers according to an exemplary
embodiment of the invention.
Figure 6 shows a data flowchart 600 according to one
exemplary embodiment of the invention.
The data flow shown takes place between units of the
network layer 601, of the data link layer 602 and the
physical layer 603.
A unit of the network layer 606, in the present
exemplary embodiment a unit of the RRC (radio resource
control) layer, that is to say a unit which performs
tasks in the framework of the RRC protocol, groups
system information 604 to form several information
blocks 605.
The system information 604 is generated at least
partially by a unit of the RRC layer.

One of the information blocks 605 contains all the
information required for a mobile radio user device in
order to verify if it is provided with access in the
mobile radio cell in which the system information 604
is sent out, that is to say all suitability
information.
From the information blocks, information messages 609
are formed in the RRC layer 601, which messages are
supplied to a unit of the data link layer 607, in the
present example a unit of the RLC (radio link control)
layer, that is to say a unit which performs tasks
within the framework of the RLC protocol.
The unit of the data link layer 607 supplies the
information messages 609, which were supplemented with
error correction bits for a possible error correction,
or segmented for sending out, for example, by the unit
of the data link layer 607, to a unit of the physical
layer 608. The unit of the physical layer 608 sends out
the information messages 609. For example, the
information messages 609 are broadcast in the mobile
radio cell.
The information blocks 605 can be both system
information blocks (SIBs) and a master information
block (MIB) .
The sending out of the information messages 609 by
means of the unit of the physical layer 60 8, for
example a physical channel, for example a broadcast
channel, can also involve a unit of the MAC layer (not
shown) which, for example, regulates the access to the
physical channel.

List of reference designations
100 Communication system
102, 102 RNS
103, 104 Iu interface

105 Core network
106 User device
107, 108 RNC
109-112 Base stations
113 Iur interface
114-125 Radio cells
126-129 Iub interface
130 Air interface
200 Data flowchart
201 BCCH
202 BCH
203 System information blocks
204 P-CCPCH
205 P-CCPCH transmit frame
3 00 System information block
3 01 System frame number
302 SIB data
400 Data structure
401 Sets of suitability information
402 Suitability information configuration
500 Sequence diagram
501-504 Sequence steps
600 Data flowchart
601 Network layer
602 Data link layer
603 Physical layer
604 System information
605 Information blocks
606 Unit of the network layer

607 Unit of the data link layer
608 Unit of the physical layer
609 Information messages

Patent claims
1. A method for generating and transmitting system
information in a mobile radio cell, in which
method
system information is grouped to form several
information blocks, the information required for a
mobile radio user device in order to verify if
said user device is provided with access to the
mobile radio cell being grouped into a single one
of the information blocks,
at least one information message is formed from
the information blocks,
the information message is supplied to a unit
of the data link layer by a unit of the network
layer and
the unit of the data link layer transmits the
information message by means of at least one unit
of the physical layer.
2. The method as claimed in claim 1, wherein the
information blocks are a master information block
or system information blocks.
3. The method as claimed in claim 2, wherein the
information block, into which the information
required for the mobile radio user device in order
to verify if said user device is provided with
access to the mobile radio cell is grouped, is a
master information block.
4. The method as claimed in claim 2, wherein the
information block, into which the information
required for the mobile radio user device in order
to verify if said user device is provided with
access to the mobile radio cell is grouped, is a
system information block.

5. The method as claimed in claim 1, wherein the unit
of the data link layer is a unit of the RLC layer.
6. The method as claimed in claim 1, wherein the unit
of the network layer is a unit of the RRC layer.
7. The method as claimed in claim 1, wherein the
information block, into which the information
required for the mobile radio user device in order
to verify if said user device is provided with
access to the mobile radio cell is grouped, does
not contain any other information.
8. The method as claimed in claim 1, wherein the
system information is transmitted by a base
station which operates the mobile radio cell.
9. The method as claimed in claim 1, wherein the unit
of the data link layer is arranged in the base
station.
10. The method as claimed in claim 1, wherein the unit
of the network layer is arranged in the base
station.
11. The method as claimed in claim 11, wherein the
information required for the mobile radio user
device in order to verify if said user device is
provided with access to the mobile radio cell is
associated with an configuration, which enables
the mobile radio user device to verify if it has
already stored the information and which signals
that the information identified by the
configuration is currently valid in the mobile
radio cell.
12. The method as claimed in claim 11, wherein the
configuration is inserted in the information
block into which the information required for the

mobile radio user device in order to verify if
said user device is provided with access to the
mobile radio cell is grouped.
13. The method as claimed in claim 11, wherein the
information is provided with validity period
information which specifies how long the
configuration for the information is valid.
14. A network device for generating and transmitting
system information in a mobile radio cell, having
a grouping device which is set up for grouping
system information to form several information
blocks, the information required for a mobile
radio user device in order to verify if said user
device is provided with access to the mobile radio
cell being grouped into a single one of the
information blocks,
a generating device which is set up for forming
at least one information message from the
information blocks,
a unit of the network layer which is set up for
supplying the information message to a unit of the
data link layer, and
the unit of the data link layer which is set up
for transmitting the information message by means
of at least one unit of the physical layer.
15. A method for verifying if a mobile radio user
device is provided with access to a mobile radio
cell, in which method
it is determined into which single information
block of a multiplicity of information blocks
transmitted in the mobile radio cell the
information required for the mobile radio user
device in order to verify if said user device is
provided with access to the mobile radio cell is
grouped,

the information block is received before other
information blocks of the multiplicity of
information blocks are received, and
it is verified if access to the mobile radio
cell is provided for the mobile radio user device
before other information blocks of the
multiplicity of information blocks are received.
16. A mobile radio user device having
a determining device which is set up for
determining into which single information block of
a multiplicity of information blocks transmitted
in a mobile radio cell the information required
for the mobile radio user device in order to
verify if said user device is provided with access
to the mobile radio cell is grouped,
a receiving device which is set up for
receiving the information block before other
information blocks of the multiplicity of
information blocks are received,
a testing device which is set up for verifying
if access to the mobile radio cell is provided for
the mobile radio user device before other
information blocks of the multiplicity of
information blocks are received.

Disclosed is a method for generating and transmitting system information in a
mobile radio cell. In said method, system information is grouped into several
information frames, information required for a mobile user device in order to
verify if said mobile user device has access to the mobile radio cell being
grouped into a single information frame, and the information frames are fed to
the data securing layer by the network layer and are transmitted by means of the
physical layer.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=619Eug4YdGWqRbGHfcAUPw==&loc=wDBSZCsAt7zoiVrqcFJsRw==

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Patent Number

268946

Indian Patent Application Number

986/KOLNP/2009

PG Journal Number

40/2015

Publication Date

02-Oct-2015

Grant Date

24-Sep-2015

Date of Filing

16-Mar-2009

Name of Patentee

INFINEON TECHNOLOGIES AG

Applicant Address

AM CAMPEON 1-12, 85579 NEUBIBERG

Inventors:

#	Inventor's Name	Inventor's Address
1	CHOI, HYUNG-NAM	AMRUMER KNICK 11, 22117 HAMBURG
2	KEMMER, BERND	WEIDENSTR. 41, 82223 EICHENAU
3	MATH, WOLFGANG	ASAMSTRASSE 10, 81541 MÜNCHEN
4	ECKERT, MICHAEL	ODERBLICK 6, 38122 BRAUNSCHWEIG

PCT International Classification Number

H04Q 7/38

PCT International Application Number

PCT/DE2007/001590

PCT International Filing date

2007-09-06

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	60/826,474	2006-09-21	Germany
2	10 2006 044 529.5	2006-09-21	Germany