JP2013059086A - System and method for enabling connection of mobile communication terminal with wireless communication network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection method to a wireless communication network such as different type or multi-RAT wireless communication network.SOLUTION: The connection method includes a step for broadcasting the information about a wireless access network available in a geographic area 100, and that information is intended to be used by a mobile communication terminal 110 in order to determine which wireless access network covers the current position of the mobile communication terminal in the geographic area. The information includes the identifier of at least one wireless access network available in the geographic area, and the data adapted to determine the coverage of the geographic area by that wireless access network in relation to the identifier of at least one wireless access network.

Description

  The present invention relates generally to the field of wireless communication networks, including mobile telephone communication networks and wireless data networks in a broad sense. More particularly, the invention relates to aspects of how a mobile communication terminal, such as a mobile phone, connects to a wireless communication network.

With the introduction of new communication technologies and standards, heterogeneous wireless communication network situations are becoming increasingly common.
Heterogeneous wireless communication network conditions include, for example, one or more GSM (registered trademark) (Global System for Mobile Communication) systems, one or more GPRS (General Packet Radio Service) systems, one or more UMTS (Universal A geographical area where two or more different wireless communication systems conforming to different standards coexist, such as a mobile communication system) system, one or more WLANs (wireless local area networks) or other types of wireless data networks It is. Different wireless communication systems may belong to the same or different telecom service providers.

  Different wireless communication systems are usually different from each other at the lowest layer of the communication protocol, especially the physical layer, data link layer, network layer and transport layer, so the heterogeneous wireless communication network situation is a multi-RAT (Radio Access Technology) system There are very many.

  Multi-mode mobile communication terminals capable of operating in heterogeneous wireless communication network situations are known in the art and are already commercially available. For example, dual-mode mobile phones support both the UMTS standard and the GSM® standard.

  Reconfigurable mobile communication terminals are also known in the art and can be reconfigured to change the supported wireless communication standards during use (eg, at some time the GSM standard). A reconfigurable mobile communication terminal configured to support UMTS can be reconfigured to support the UMTS standard).

  In a heterogeneous or multi-RAT situation, a multi-mode and / or reconfigurable mobile communication terminal must be able to connect to the optimal RAT. When powered on, the mobile terminal will determine which is the best RAT within the geographic area in which it is located, or what frequency range will be utilized by the RAT present in that particular geographic area. Do not recognize about. This latter aspect is particularly critical because if the DSA (Dynamic Spectrum Allocation) technology or FSM (Flexible Spectrum Management) technology is implemented, the frequency range of the RAT is established a priori, for example according to the preferred policy of the network operator. It is not possible to change over time. Therefore, the mobile communication terminal must scan the entire frequency range to detect which is the available RAT at its current location, which has a significant impact on the time that the terminal needs for camping. In addition, a large amount of power, which is an important resource for battery-powered handheld devices such as mobile communication terminals, is consumed.

  L. T.A. Le and A.A. H. Ahghami “Performance of an accessing and allocation scheme for download channel in SDR”, Wireless Network Conference, Chicago, 2000, Volume 2, pages 517-521, all Communication channel called GPDCH (Global Pilot and Download Channel) used for the exchange of broadcast messages and signaling messages and for software download procedures for reconfiguration of reconfigurable mobile communication terminals This method is presented. The availability of communication channels within the frequency band known a priori facilitates the task of the mobile communication terminal, thereby determining which RATs are available from messages sent over such channels, respectively. Instructions for different frequency bands, different telecom operators.

  The document “Cognitive Pilot Channel”, p. Cordier et al., 15th Wireless World Research Forum, December 8-9, 2005, to Paris by broadcasting relevant information on frequency band, RAT, service, load status, etc. to the optimal network Two possible solutions have been presented for establishing a communication channel, the so-called “CPC” (“cognitive pilot channel”), for providing sufficient information to the mobile terminal to help the user's connection.

  According to the first proposed solution, the CPC is broadcast over a wide zone containing a number of different meshes, the CPC contains data for all meshes in this area, and for each mesh, the CPC is , Operators available in the mesh, their preferred technology and corresponding frequency bands. When a terminal located in a mesh is switched on, it itself determines its position using GPS (Global Positioning System). Thanks to its location knowledge, the terminal can retrieve from the CPC information about the technologies available in its mesh, the operators deploying these RATs, and the corresponding frequency bands. In this way, the terminal establishes a connection with the associated operator and network.

  P. The second solution proposed in Cordier et al. Is for CPCs with a multi-level hierarchical structure with country level CPC (level 1), operator level CPC (level 2) and network level CPC (level 3). is there. Level 1 CPC indicates who is in the vicinity of the mobile terminal area (operator) and what frequency the Level 2 CPC is operating at, and Level 2 CPC informs which RAT is operating at which frequency by the operator Level 3 CPC indicates RAT information.

  The aforementioned P.I. Similar to the Cordier et al. Available in Houze et al. “Common Pilot Channel for Network Selection”, VTC 2006-Spring, 2006 IEEE 63rd Mobile Technology Conference, May 2006, pages 67-71. Describes the concept of placing a common pilot channel (CPC) in the harmonic frequency band in order to initiate a connection with a simple network. The area covered by one broadcast channel is divided into meshes, and for each mesh, each operator contains corresponding information: available technology and corresponding frequency band.

  Applicants are good at using CPC-like channels to facilitate mobile terminal camping into the network, but the proposed solution for implementing such channels is satisfactory I knew it wasn't.

  In particular, P.I. Proposed in Cordier et al. The first solution, similarly disclosed in the Houze et al. Document, does not use the communication bandwidth efficiently because the information transmitted is very redundant. Because the meshes are considered separate from each other, regardless of whether the same RAT is available in adjacent meshes in the geographic area of interest, for each mesh, the CPC determines the operators available in the mesh, Information on the preferred technology and the corresponding frequency band. This forces one to reserve more bandwidth for the CPC, which is one undesirable because CPC dedicated bandwidth cannot be used to transport the payload. In other words, in a typical RAT, the information on the presence of the RAT is replicated for every mesh covered by the RAT, which wastes a lot of bandwidth, like GSM and UMTS In particular, for systems characterized by wide area coverage, the waste of bandwidth is particularly significant because the number of meshes in which the system exists, and thus the number of times information about the presence of the system is duplicated.

  P. The limitation of the second solution proposed in the Cordier et al. Document is that the time required to access the RAT is longer compared to the case of a single level CPC and that the telecom operator The part of the licensed bandwidth for broadcasting the CPC must be sacrificed.

  Applicant has set a bandwidth requirement for establishing a channel that is used to convey information for facilitating a connection to a network by a mobile terminal, for the first proposed solution described above. We have found a more efficient solution for implementing CPC that can be significantly reduced. In particular, Applicants subdivide the geographical area of interest into several different meshes, and then for each single mesh, instead of specifying which RAT is available within it, It has been found that it is much better to convey information about the RAT and to provide data (eg, geographic coordinates) adapted to determine the area covered by that RAT for each RAT. In other words, according to the present invention, the geographical area of interest is consequently subdivided into variable-sized parts (possibly overlapping), each part being covered by the RAT present in the geographical area of interest. Respond according to the area.

  According to one aspect of the present invention, the method includes broadcasting information about available radio access networks available in a geographic area into the geographic area, the information being current in the geographic area. For enabling connection of a mobile communication terminal to a wireless communication network, intended to be used by the mobile communication terminal to determine which radio access network covers the location of the mobile communication terminal Is provided.

  The information relates to at least one radio access network identifier available within the geographic area and a coverage area of the geographic area by the radio access network in relation to the at least one radio access network identifier. Data adapted to be determined.

The at least one radio access network may include a list of radio access networks available within the geographic area.
The data adapted to determine the extent of coverage of a geographic area by the radio access network may include geographic coordinates of at least one geographic point within the geographic area. The data may also include a length indication. The at least one point may be the center of a circle, the length indication defines a radius of the circle, and the circle describes the extent of coverage of a geographic area by the radio access network. The data adapted to determine a coverage area of a geographical area by the radio access network is a polygonal coordinate that describes the coverage area of the geographical area that is the geographical coordinates of at least two geographical points. The geographical coordinates defining the vertices may be included.

  If the radio access network covers the entire geographic area, the data adapted to determine the coverage area of the geographic area by the radio access network is such that the radio access network covers the entire geographic area. Instructions can be included.

The identifier of the radio access network can take the form of a character string.
For the broadcast, it is possible to use an out-of-band broadcast communication channel that is located in a frequency band outside the licensed band assigned to the radio access network existing in the geographical area of interest. . Alternatively, an in-band broadcast communication channel may be used that is located in a frequency band within a licensed band assigned to a radio access network residing in the geographical area of interest. The in-band broadcast communication channel can be defined as a logical channel of one of the radio access networks existing in the geographical area of interest.

  According to another aspect of the invention, the information comprises network functions adapted to control broadcast in a geographical area of information about available radio access networks available in the geographical area, Is provided that is intended to be used by a mobile communication terminal to determine which radio access network covers the current location of the mobile communication terminal within the geographical area. The information is adapted to determine an identifier of at least one radio access network available within the geographic area and a coverage area of the geographic area by the radio access network for the at least one radio access network. Data.

The at least one radio access network may include a list of radio access networks available within the geographic area.
The data adapted to determine the extent of coverage of a geographic area by the radio access network may include geographic coordinates of at least one geographic point within the geographic area. The data may also include a length indication. In particular, the geographical coordinates of at least one geographical point may define a geographical location of a circle center, the length indication defines a radius of the circle, and the circle depends on the radio access network Describe the coverage area of a geographic area. The data adapted to determine a coverage area of a geographical area by the radio access network is a polygonal coordinate that describes the coverage area of the geographical area that is the geographical coordinates of at least two geographical points. The geographical coordinates defining the vertices may be included. If the radio access network covers the entire geographic area, the data adapted to determine the coverage area of the geographic area by the radio access network is such that the radio access network covers the entire geographic area. Instructions can be included.

The identifier of the radio access network can take the form of a character string.
For the broadcast, it is possible to use an out-of-band broadcast communication channel that is located in a frequency band outside the licensed band assigned to the radio access network existing in the geographical area of interest. . Alternatively, an in-band broadcast communication channel is used that is located in a frequency band within a licensed band assigned to a radio access network residing in the geographical area of interest. An in-band broadcast communication channel can be defined as a logical channel of one of the radio access networks existing in the geographical area of interest.

  According to a third aspect of the invention, the mobile adapted to receive information from the radio communication network about the available radio access network available in the geographical area broadcast in the geographical area. A communication terminal, wherein the information is intended to be used by the mobile communication terminal to determine which radio access network covers the current location of the mobile communication terminal within the geographical area; A mobile communication terminal is provided. The mobile communication terminal comprising a receiver adapted to receive the information, the information being associated with an identifier of at least one radio access network available within the geographic area, Data adapted to determine a coverage area of a geographical area by the radio access network.

  According to yet another aspect of the invention, a radio base station of a radio communication network adapted to broadcast information about available radio access networks available in the geographical area into the geographical area. The information is intended to be used by the mobile communication terminal to determine which radio access network covers the current location of the mobile communication terminal within the geographic area A wireless base station of the network is provided. The information relates to at least one radio access network identifier available within the geographic area and a coverage area of the geographic area by the radio access network in relation to the at least one radio access network identifier. Data adapted to be determined.

The at least one radio access network may include a list of radio access networks available within the geographic area.
The data adapted to determine the extent of coverage of a geographic area by the radio access network may include geographic coordinates of at least one geographic point within the geographic area. Data adapted to determine the coverage area of a geographical area by the radio access network may also include a length indication. In particular, the geographic coordinates of at least one geographic point can define a geographic location of the center of a circle, the length indication can define a radius of the circle, and the circle can be the radio Describes the extent of coverage of the geographic area by the access network. The data adapted to determine a coverage area of a geographical area by the radio access network is a polygonal coordinate that describes the coverage area of the geographical area that is the geographical coordinates of at least two geographical points. The geographical coordinates defining the vertices may be included. If the radio access network covers the entire geographic area, the data adapted to determine the coverage area of the geographic area by the radio access network is such that the radio access network covers the entire geographic area. Instructions can be included.

The identifier of the radio access network can take the form of a character string.
For the broadcast, it is possible to use an out-of-band broadcast communication channel that is located in a frequency band outside the licensed band assigned to the radio access network existing in the geographical area of interest. . Alternatively, an in-band broadcast communication channel may be used that is located in a frequency band within a licensed band assigned to a radio access network residing in the geographical area of interest. An in-band broadcast communication channel can be defined as a logical channel of one of the radio access networks existing in the geographical area of interest.

  The features and advantages of the present invention will become apparent upon reading the following detailed description of the embodiments given by way of non-limiting example only, with reference to the accompanying drawings, in which:

FIG. 2 schematically illustrates a heterogeneous or multi-RAT wireless communication network situation to which the present invention is advantageously applied. FIG. 1 schematically illustrates the architecture of a system according to an embodiment of the invention. FIG. 3 is a diagram illustrating an architecture of a communication protocol according to an embodiment of the present invention. FIG. 3 schematically illustrates a general structure of a communication protocol message according to an embodiment of the present invention. 3 is a schematic flowchart illustrating main steps of a mobile terminal camping procedure according to an embodiment of the present invention; FIG. 3 schematically illustrates the structure of a part of a first type of message of a communication protocol according to an embodiment of the present invention. FIG. 6 is a schematic flow diagram illustrating the main steps of the outdoor camping procedure portion of the camping procedure of FIG. 5 in one embodiment of the present invention. 6 is a schematic flow diagram illustrating the main steps of the indoor camping procedure portion of the camping procedure of FIG. 5 in one embodiment of the present invention. 6 is a schematic flow diagram illustrating the main steps of the indoor camping procedure portion of the camping procedure of FIG. 5 in one embodiment of the present invention. FIG. 6 is a schematic flowchart showing main steps of an indoor camping procedure portion of the camping procedure of FIG. 5 in an embodiment of the present invention. FIG. 4 schematically illustrates the structure of a part of a second type of communication protocol message according to an embodiment of the present invention; FIG. 6 schematically illustrates the structure of a part of a third type of communication protocol message according to an embodiment of the present invention; FIG. 6 schematically illustrates the structure of a part of a fourth type of communication protocol message according to an embodiment of the present invention; FIG. 7 schematically illustrates the structure of a part of a fifth type of communication protocol message according to an embodiment of the present invention; FIG. 7 schematically illustrates the structure of a part of a sixth type of communication protocol message according to an embodiment of the present invention; FIG. 7 schematically illustrates the structure of a part of a seventh type of communication protocol message according to an embodiment of the present invention; FIG. 3 is a signaling diagram schematically illustrating messages exchanged during a procedure for downloading a software module for reconfiguring a mobile terminal in an embodiment of the present invention.

  Referring to the drawings, FIG. 1 schematically illustrates a heterogeneous or multi-RAT wireless communication situation to which the present invention is advantageously applied. The geographical area 100 concerned has two or more, in the illustrated example four different radio access, implementing different RATs of RATj, RATk, RATm, RATn managed by the same or different telecom operators in terms of radio signals. Covered by the network (RAN). These different RATs are, for example, GSM® RAT, GSM® / GPRS RAT, GSM® / GPRS / EDGE RAT, UMTS FDD (frequency division duplex) RAT, UMTS TDD (time division) Duplex) RAT, WLAN (eg, IEEE 802.11a / b / g) RAT, CDMA2000 RAT, IS-95 RAT. The number and specific type of RAN is not limiting for the present invention. Each RAN has a respective coverage area 105j, 105k, 105m, 105n that depends on the deployment choices of the RAN telecom operator owner.

  Reference numeral 110 is a multi-mode and / or reconfigurable mobile communication terminal capable of operating in different RATs, specifically two or more of four different RATs RATj, RATk, RATm, RATn. Indicates.

  In general, in order to connect to a network belonging to a heterogeneous wireless communication situation, the mobile terminal 110 needs to know which RAT is available at the current location of the mobile terminal and select an optimal RAT. If the mobile terminal is a reconfigurable terminal and the available RAT is not supported by its current configuration, the mobile terminal can download the software necessary to change its configuration. A reconfigurable terminal is described, for example, in published international application WO 2006/045334, which is incorporated herein by reference.

  According to the present invention, in order to convey information used by a mobile communication terminal to facilitate the task of connecting to a heterogeneous wireless communication network into the geographical area 100 concerned, hereinafter, RASD (Radio Aware and Software Download) ) A dedicated communication channel, called a channel, and an associated communication protocol are established.

  FIG. 2 illustrates the architecture of a system according to one embodiment of the present invention from a functional block perspective. A plurality of RASD transceiver nodes or stations 205 for transmitting / receiving via a RASD channel are deployed in the geographical area 100 of interest, and a typical transceiver station 205 has a respective radio coverage area 210. The RASD transceiver station 205 is similar to a base station in a mobile telephony network, such as a GSM® BTS (base transceiver station) or UMTS Node B, or a reconfigurable MSBS (multi-standard base station). Is a transceiver station. The RASD transceiver station 205 can also coexist with different RAT transceiver stations in a heterogeneous network.

  The RASD transceiver station 205 is in wireless and / or wired communication relationship with the RASD controller node 215. The RASD controller node 215 implements network functions that serve to manage the information content transmitted by the RASD transceiver station 205. The RASD controller node 215 also provides coverage of the area by the information request issued by the mobile communication terminal 110 and transmitted via the RASD channel, specifically, the RAT of the heterogeneous wireless communication status, as will be described in detail later. It serves to manage messages that carry requests for information about 100. In addition, the RASD controller node 215 is enabled to reconfigure the mobile communication terminal to adapt the reconfigurable mobile communication terminal to operate with the RAT present at the current location of the mobile communication terminal. It serves to handle the downloading of various software to a reconfigurable mobile communication terminal.

  The RASD controller node 215 can obtain different RATs present in the area 100 and information regarding their radio coverage from the network plan data 220 provided by, for example, network operation and management functions.

  Reference number 225 indicates a geographic location system, such as GPS, and mobile communication terminal 110 is adapted to utilize that system to determine their location within the area of interest.

  Preferably, the mobile communication terminal 110 has a short-range wireless, for example, wireless communication function. For example, the mobile communication terminal 110 includes a Bluetooth interface, a ZigBee interface, a HomeRF interface, an IR interface, etc. It can communicate directly with a proximity mobile communication terminal or other local device located within a 100 meter distance range.

  FIG. 3 schematically shows the architecture of the RASD communication protocol according to an embodiment of the present invention. The lowest level of the protocol stack (especially the first and second layers of the OSI stack, namely the physical layer and the connection layer) are the RASD controller node 215 (block 305-c) and the general RASD transceiver station 205 (block 305-s) and the mobile communication terminal 110 (block 305-t). The RASD protocol further includes a RASD control protocol layer (third level of the OSI stack) implemented in the RASD controller node 215 (block 310-c) and the mobile communication terminal 110 (block 310-t). The particular implementation of the lowest protocol layer, especially in mobile communication terminals and general RASD transceiver stations, is not itself limiting. In particular, to implement the physical layer, either use one of the existing RATs, eg GSM (establishing a bandwidth equal to 200 KHz for every radio channel) or a dedicated RASD A radio layer can be defined.

  According to one embodiment of the present invention, the information provided by the RASD controller node 215 to the RASD transceiver station 205 for broadcasting into the geographical area 100 of interest is the type of RAT available (eg, GSM (registered Trademark), GSM (registered trademark) / GPRS, GSM (registered trademark) / GPRS / EDGE, UMTS FDD, UMTS TDD, IEEE 802.11a / b / g, CDMA2000, IS-95). For each RAT, the RASD controller node 215 further provides an indication regarding the coverage area of the RAT.

  According to a preferred embodiment of the present invention, an indication for each coverage area of an existing RAT, which is an indication broadcast into the area over the RASD channel, is in the form of data for each of the existing RATs. Given the data, the corresponding RAT coverage area, eg, the coordinates (latitude and longitude) of the center of the virtual circle representing the RAT coverage area, and measurements of the radius of the circle (eg, meters or other lengths) (In units of height), or the coordinates of two corners of a diagonal diagonal of a virtual rectangle representing the RAT coverage area (latitude and longitude), or the coordinates of the vertex of a virtual polygon representing the RAT coverage area (latitude and longitude) Etc. can be obtained. Since there are two or more RATs in a given zone of the geographical area of interest, these indications regarding coverage define each coverage area with each RAT that may overlap each other.

  Thus, the amount of data broadcast over the RASD channel, and thus the RASD channel bandwidth requirements, in particular, subdivides the geographic area into zones and, for each zone, relates to the RAT available within that zone. Compared to solutions that broadcast information, it is relatively limited. In fact, especially for systems with wide area coverage, such as GSM® and UMTS, for any zone in which the geographical area is subdivided (its size must be relatively small) Repeating information about whether a RAT is available in it introduces significant redundancy (in these cases, the same for all of the several zones that make up the coverage area of a GSM system or UMTS system) Information "GSM" or "UMTS" must be repeated).

  The structure of a general RASD protocol message according to an embodiment of the present invention is shown in FIG. The RASD protocol message, indicated generally at 400, includes a field 405 ("MESSAGE_TYPE") intended to contain an indication of the type of message, and a broadcast message (value " Field 410 (“MESSAGE_SCOPE”) and a field 410 intended to contain a value specifying whether it is a single cast message (value “SINGLECAST”) intended for a particular mobile communication terminal; An optional field 415 ("UE_ID") that is present when specifying that the message is a singlecast message and is intended to contain an identifier of the mobile communication terminal to which the message is directed; , Message And a field 420 intended to contain information content of over di 400 ( "SPECIFIC_DATA").

  In the following, referring to FIG. 5, the mobile communication terminal 110 can be connected to one of the RATs covered by a general RASD transceiver station 205 and available in the area 210 where the mobile communication terminal 110 is located. A camping algorithm according to an embodiment of the present invention will be described. Assume that the mobile communication terminal 110 is a multi-mode handset capable of operating with multiple different RATs. Also, depending on the RAT to which the mobile communication terminal must connect, the mobile communication terminal can be reconfigured, i.e. its wireless communication function can be reprogrammed, and valid software modules required for reprogramming the terminal can be If not available at the terminal, it is assumed that the terminal is capable of “over the air” (“OTA”) downloading the required valid software module.

  The RASD controller node 215 periodically initiates a coverage information broadcast procedure (block 501) to transmit information regarding the radio coverage of different RATs within the respective area 210 to each RASD transceiver station 205. The information is included in a “COVERAGE INFORMATION” message, which is a broadcast message that the RASD transceiver station 205 broadcasts in each area 210.

  The “COVERAGE INFORMATION” message has the general structure shown in FIG. 4 and the “SPECIFIC_DATA” field 420 contains one or more blocks (“COVERAGE INFORMATION BLOCK” or “CIB”) for each RAT. Contains one. A typical “CIB” structure is schematically illustrated in FIG. The “CIB” 600 includes up to six fields 605, 610, 615, 620, 625 and 627. Field 605 (“RAT_TYPE”) is intended to contain an indication regarding the type of RAT. For example, the “RAT_TYPE” field 605 may have values “GSM®”, “GSM® / GPRS”, “GSM® / GPRS / EDGE”, “UMTS FDD”, “UMTS TDD”, A value selected from the list of “IEEE802.11a / b / g”, “CDMA2000”, “IS-95” may be included. Field 610 (“COVERAGE_EXT”) indicates whether the RAT covers the entire area 210 of the RASD transceiver station 205 (value “GLLOBAL”) or whether the RAT covers only a part of the area 210 (value). "LOCAL") is intended to include a value that specifies. Field 615 (“COVERAGE_AREA”) is optional and is present only if the value contained in “COVERAGE_EXT” field 610 is equal to “LOCAL”. The “COVERAGE_AREA” field 615 is intended to contain data adapted to specify the coverage area of the RAT in question. For example, as described above, the coverage area can be represented as a virtual circle, in which case the “COVERAGE_AREA” field 615 has three subfields 630 (“CENTER_LAT”), 635 (“CENTER_LONG”) and 640 (“RADIUS”). )including. Subfield 630 and subfield 635 are intended to contain instructions regarding the coordinates (latitude and longitude) of the virtual circle center used to define the coverage area of each RAT, and field 640 is a virtual circle. Is intended to include a measurement of the radius (eg, in meters). Field 620 (“OPERATOR_ID”) is intended to contain the identifier of the telecom operator managing the RAT. Field 625 (“RF_BAND”) is intended to contain an indication of the frequency band assigned to that RAT. The “RF_BAND” field 620 may include three subfields 645 (“INIT_FREQ”), 650 (“FINAL_FREQ”), and 655 (“CH_BAND”). Subfield 645 and subfield 650 are intended to contain values indicating the first and last frequencies (eg, in KHz) of the frequency band assigned to the RAT, and field 655 is assigned to the RAT of interest. It is intended to include a value that specifies the bandwidth (eg, in KHz) of each channel. Field 627 (“PRIORITY”) is intended to contain a value specifying the priority assigned to the RAT in question. The priority values specified in these fields of the “CIB” 600 can be used to determine the order of the “CIB” 600 in the “COVERAGE INFORMATION” message, thereby relating to the RAT having a higher priority. “CIB” 600 takes precedence over “CIB” 600 for a RAT having a lower priority.

  The RASD controller node 215 can, for example, send a “COVERAGE INFORMATION” message with a predetermined periodicity (eg, every 480 ms, assuming GSM 1 and 2 layers are used). . If the time period selected for the broadcast is not sufficient to send the entire “COVERAGE INFORMATION” message, the RASD controller node 215 sends the next “COVERAGE INFORMATION” message to send the entire “COVERAGE INFORMATION” message. As many times as necessary to complete the selected time period can be delayed.

  Returning to FIG. 5, the RASD controller node 215 listens for a request received from the mobile communication terminal (block 503), and if the request is received (exit branch Y of block 503), the request is processed (block 505). If not received (exit branch N of block 503), the RASD controller node 215 again starts the coverage information broadcast procedure (block 501).

  According to one embodiment of the present invention, the camping algorithm addresses the situation where the mobile communication terminal cannot confirm its geographical location because the GPS signal is not received by the mobile communication terminal, for example because it is in an indoor environment. Adapted to do.

  Specifically, when the general mobile communication terminal 110 is turned on (block 507), the mobile communication terminal checks whether a GPS signal is received (block 509). If yes, typically when the mobile communication terminal is located outdoors (exit branch Y of block 509), the mobile communication terminal 110 initiates an outdoor camping procedure (block 511), and generally the mobile communication terminal is located indoors. If no, sometimes occurring (exit branch N of block 509), if the mobile communication terminal does not receive a GPS signal, the mobile communication terminal 110 initiates an indoor camping procedure (block 513). The camping procedure is then terminated (block 515).

The outdoor camping procedure and the indoor camping procedure will be described in detail below using the schematic flowcharts of FIG. 7 and FIGS. 8A, 8B, and 8C, respectively.
Referring to FIG. 7, in an outdoor camping procedure, the mobile communication terminal 110 tunes its radio receiver on the RASD channel transmitted by the RASD transceiver station 205 covering the area where the terminal 110 is located (block 701).

  The mobile communication terminal 110 receives the “COVERAGE INFORMATION” message broadcast by the RASD transceiver station 205, decodes the information content, and is included in one or more “CIB” 600 of the received “COVERAGE INFORMATION” message. Information is stored (block 703).

The mobile communication terminal 110 then determines its location using the GPS signal (block 705).
Next, the mobile communication terminal 110 starts scanning the “CIB” 600 included in the received “COVERAGE INFORMATION” message (block 707).

  Starting from the first “CIB” 600, the mobile communication terminal 110 indicates that the value contained in the “COVERAGE_EXT” field 610 means that the corresponding RAT of the examined “CIB” 600 covers the entire area 210. Is checked to see if it is equal to “GLOBAL” (block 709). If yes, the mobile communication terminal 110 checks whether it is configured for the RAT specified in the “RAT_TYPE” field 605 of the “CIB” 600 that was examined (block 711) and configured. If so (exit branch Y of block 711), the mobile communication terminal 110 connects to that RAT (block 713) and the outdoor camping procedure ends. In a preferred embodiment, the mobile communication terminal 110 is a list of telecom operators preferred by the telecom operator indicated by the identifier in field 620, eg, one of the lists stored in the SIM (subscriber identity module) of that terminal. If yes, the mobile communication terminal can select that RAT, and if no, it can search for another RAT. Finally, if none of the available RATs belong to the preferred telecom operator, the terminal selects the first available RAT.

  Alternatively, if the mobile communication terminal 110 is not configured for that RAT (exit branch N of block 711), does the terminal already have the necessary valid software modules to self-reconfigure for that RAT? A check is made (block 715). If yes (exit branch Y), the mobile communication terminal 110 self-reconfigures for the specified RAT (block 717), connects to that RAT (block 713), and if no (exit branch N of block 715). ), If there is more “CIB” 600 (block 719, exit branch Y), select the next “CIB” 600 for another RAT, and repeat the above operation, if there is no more “CIB” 600 (block 719). , Egress branch N), the mobile communication terminal 110 initiates the terminal reconfiguration download procedure (block 721) and the software necessary to reconfigure that terminal to operate at the highest priority RAT (block 723). The module is downloaded and then connected to its RAT (block 713).

  Returning to block 709, if the value contained in the “COVERAGE_EXT” field 610 is equal to “LOCAL” which means that the RAT does not cover the entire area 210 (exit branch N), the mobile communication terminal 110 Checks the “COVERAGE_AREA” field 615 provided with an indication adapted to determine the coverage area of the RAT within the area 210 in which the mobile terminal is located (block 725). For example, the mobile communication terminal 110 determines the RAT coverage area using data specifying the coordinates and radius of the center of a virtual circle representing the RAT coverage area. Mobile communication terminal 110 then determines whether its current location is within the RAT coverage area (determined in block 705 using GPS signals) (block 727). If yes, the mobile communication terminal 110 performs the same operation described above as illustrated by blocks 711-723. Instead, if the mobile communication terminal 110 determines that its current location is not within the RAT coverage area (exit branch N of block 727), the mobile communication terminal 110 may have the next stored “CIB” 600 (Exit branch Y of block 719), go to it (block 707), check it in the same way just described, or start the terminal reconfiguration download procedure described later (block 721), then the highest priority Connect to the RAT (block 723).

  An indoor camping procedure according to one preferred but non-limiting embodiment of the present invention is illustrated in the flow charts of FIGS. 8A, 8B and 8C. After determining that there is no GPS signal, the mobile communication terminal 110 checks whether the available coverage information data received with the previous “COVERAGE INFORMATION” message (received before being turned off) is in its memory. (Block 801). If yes (exit branch Y), the mobile communication terminal 110 starts scanning “CIB” 600 stored in its memory (block 803). Starting from the first “CIB” 600 of the stored “CIB” 600, the mobile communication terminal 110 checks whether the value contained in the “COVERAGE_EXT” field 610 is equal to “GLLOBAL” (block 805). . If yes (exit branch Y), the mobile communication terminal 110 checks whether it is configured for the RAT specified in the “RAT_TYPE” field 605 of the checked “CIB” 600 (block 807). If configured (exit branch Y of block 807), the mobile communication terminal 110 connects to that RAT (block 809) and the indoor camping procedure ends. Alternatively, if the mobile communication terminal 110 is not configured for that RAT (exit branch N of block 807), the terminal determines whether it already has the necessary software modules to self-configure for that RAT. Confirmation (block 811). If yes (exit branch Y), the mobile communication terminal 110 self-reconfigures for the specified RAT (block 813), connects to that RAT (block 809), and if no (exit branch N of block 811). ), If there is more “CIB” 600 (block 815, exit branch Y), select the next “CIB” 600 for another RAT and repeat the above operation.

  Similarly, if the value contained in the “COVERAGE_EXT” field 610 is equal to “LOCAL” (exit branch N of block 805) and there is a further “CIB” 600, the mobile terminal selects the next “CIB” 600; Repeat the above operation.

  In other words, when the mobile communication terminal cannot determine its position due to, for example, no GPS signal, the entire area 210 in which the mobile terminal is located is based on the information the mobile terminal previously received via the RASD channel. If the mobile terminal tries to connect to the RAT, the mobile terminal tries to connect to the RAT, but the part of the area 210 covered by the RAT that covers only a part of the RAT instead of the entire area 210 The mobile terminal does not attempt to connect to that RAT.

  If there is no further “CIB” 600 (block 815, egress branch N) or there is no coverage information data available in its memory (egress branch N of block 801), the mobile communication terminal 110 is a proximity mobile communication terminal. A short-range wireless communication session may be initiated to attempt to establish communication with, from which missing or updated coverage information data may be obtained (block 817).

  As soon as the mobile communication terminal 110 receives a response from a neighboring mobile terminal, it ignores possible further responses received from other neighboring mobile terminals and initiates a coverage information request procedure with the responding mobile terminal (block 819).

  According to an embodiment of the present invention, the coverage information request procedure requests the mobile communication terminal 110 to transmit a “COVERAGE INFORMATION REQUEST” message to the neighboring mobile terminal that has responded to the short-range wireless communication request.

  The “COVERAGE INFORMATION REQUEST” message has the general structure shown in FIG. 4, and the “SPECIFIC_DATA” field 420 schematically shown in FIG. 9 includes an indication of the RAT specified by the mobile communication terminal. An intended field 905 (“IDENT_RAT_TYPE”) and a field 910 (“RAT_MEASURES”) intended to contain a list of measurements relating to the radio signal level of the RAT specified in the field 905 executed by the mobile communication terminal. With. Each of the information elements in field 910 (one information element for each measurement) is a field 915 ("BTS_ID") intended to contain the identifier of the RAT transceiver station for which the measurement was performed, It consists of a field 920 (“MEASURED_LEVEL”) that is intended to contain values obtained from measurements made for the transceiver station specified in 915.

  The “COVERAGE INFORMATION REQUEST” message sent by the mobile communication terminal 110 that initiates the coverage information request procedure has all the fields set to undefined values (these data are not needed for neighboring mobile terminals).

  The neighboring mobile terminal that receives the “COVERAGE INFORMATION REQUEST” message from the mobile communication terminal 110 returns a “COVERAGE INFORMATION RESPONSE” message in response thereto.

  The “COVERAGE INFORMATION RESPONSE” message is a single cast message having the general structure shown in FIG. 4, and the “SPECIFIC_DATA” field 420 includes one or more “RIBs” (“RAT INFORMATION BLOCKS”) included in the message. Field that is intended to contain a list of The structure of a general “RIB” 1000 is shown in FIG. It includes instructions regarding the type of RAT (“GSM®”, “GSM® / GPRS”, “GSM® / GPRS / EDGE”, “UMTS FDD”, “UMTS TDD”, “IEEE802”. .11a / b / g ”,“ CDMA2000 ”,“ IS-95 ”), and field 1005 (“ OPERATOR_ID ”) is the telecom that manages the RAT. The field 1010 (“RF_BAND”) is intended to contain the operator's identifier, and is intended to contain an indication of the frequency band assigned to the RAT in question, and the “RF_BAND” field 1010 has three subfields 1020 ( "INIT_FREQ"), 1025 (" FINAL_FREQ ") and 1030 (" CH_BAND "), where subfield 1020 and subfield 1025 are values indicating the first and last frequencies (eg, in KHz) of the frequency band assigned to the RAT. Field 1030 is intended to contain a value specifying the bandwidth (eg, in KHz) of each channel assigned to the RAT, and field 1025 (“PRIORITY”) is It is intended to include a value that specifies the priority assigned to that RAT. Within the “SPECIFIC_DATA” field 420 of the “COVERAGE INFORMATION RESPONSE” message, the different “RIB” 1000s are preferably ordered in descending order of priority value.

  If the proximity mobile communication terminal responding to the short-range wireless communication session initiated by the mobile communication terminal 110 has available information, it is entered in the field of the “COVERAGE INFORMATION RESPONSE” message.

  When the mobile communication terminal 110 receives the “COVERAGE INFORMATION RESPONSE” message from the neighboring mobile terminal, the mobile communication terminal 110 checks whether or not the field including the list of “RIB” is included in the message. If the list is not empty, the “RIB” ”List scanning starts. The first “RIB” 1000 (corresponding to the RAT assigned the highest priority) is selected (block 821). The mobile communication terminal 110 checks whether it is configured for the RAT specified in the “RAT_TYPE” field 1005 of the inspected “RIB” 1000 (block 823) and if so (block 823). E), the mobile communication terminal 110 connects to the RAT (block 825) and the outdoor camping procedure ends. In a preferred embodiment, the mobile communication terminal 110 is a list of telecom operators preferred by the telecom operator indicated by the identifier in field 620, eg, one of the lists stored in the SIM (subscriber identity module) of that terminal. If yes, the mobile communication terminal can select that RAT, and if no, it can search for another RAT. Eventually, if none of the available RATs belong to the preferred telecom operator, the terminal can select the first available RAT. Instead, if the mobile communication terminal 110 is not configured for that RAT (exit branch N of block 823), the terminal checks to see if it already has the necessary software modules to self-configure for that RAT. (Block 827). If yes (exit branch Y), the mobile communication terminal 110 configures itself for the specified RAT (block 829), connects to that RAT (block 825), and if no (exit branch N of block 827). If there is a further “RIB” 1000 (block 831, exit branch Y), the next “RIB” 1000 for another RAT is selected and the above operation is repeated.

  If there is no further “RIB” 1000 in the “COVERAGE INFORMATION RESPONSE” message received by the neighboring mobile terminal, or if the field containing the list of “RIB” included in the message indicates that the list is empty, or If no response to the short-range wireless communication request is received (block 831, egress branch N), the mobile communication terminal 110 initiates a coverage information request procedure with the RASD controller node 215 (block 833).

The mobile communication terminal 110 first performs a radio signal level measurement on the RAT for which it is currently configured (block 835).
The mobile communication terminal 110 then sends a “COVERAGE INFORMATION REQUEST” message (M1 in the drawing) to the RASD controller node 215 via the RASD channel (block 837). In the “COVERAGE INFORMATION REQUEST” message sent by the mobile communication terminal 110, field 905 and field 910 indicate the type of RAT that the terminal is currently configured for and the results of the measurements performed by the mobile terminal. And so on. Specifically, the mobile communication terminal 110 puts the RAT instruction specified by the mobile communication terminal in the field 905 (“IDENT_RAT_TYPE”), and relates to the radio signal level of the RAT specified in the field 905. Compile a “COVERAGE INFORMATION REQUEST” that places the list of measurements performed by 110 in field 910 (“RAT_MEASURES”). Specifically, for each measurement, the mobile communication terminal places the identifier of the RAT transceiver station for which the measurement was performed in field 915 ("BTS_ID") and is performed for the transceiver station specified in field 915. The value obtained from the last measurement is placed in field 920 (“MEASURED_LEVEL”).

  The RASD controller node 215 receives the “COVERAGE INFORMATION REQUEST” message and locates the mobile communication terminal 110 using the information contained therein (block 839). Any position location technique can be used, for example, a triangulation technique. Once the RASD controller node 215 locates the mobile communication terminal 110, the RASD controller node 215 initiates a terminal performance exchange procedure (block 841). In the terminal performance exchange procedure, a “CAPABILITY INFORMATION REQUEST” message (M2 in the drawing) is transmitted to the mobile communication terminal 110. The “CAPABILITY INFORMATION REQUEST” message is a single cast message having the general structure shown in FIG. 4, and the “SPECIFIC_DATA” field 420 is empty.

  Upon receipt of the “CAPABILITY INFORMATION REQUEST” message, the mobile communication terminal 110 initiates a terminal performance exchange procedure (block 843), and the mobile communication terminal 110 returns a “CAPABILITY INFORMATION RESPONSE” message (in the drawing, which is returned to the RASD controller node 215). Compile M3).

  The “CAPABILITY INFORMATION RESPONSE” message is a single cast message having the general structure shown in FIG. The “SPECIFIC_DATA” field 420 has the structure shown in FIG. 11, which includes a field 1105 (“RECONF_TYPE”) that is intended to contain a value indicating a possible reconfiguration supported by the mobile communication terminal 110. . The value contained in the field 1105 is “MULTI-MODE”, which indicates that the mobile communication terminal 110 is a multi-mode terminal and can be reconfigured in different operating modes (ie, to operate with different RATs). “SOFTWARE” indicating that the software can be reconfigured to change, “ANY” indicating that the mobile communication terminal 110 supports both of the previous two configuration types. A field 1110 (“SUPPORTED_RATs”) is present when the value included in the field 1105 is “MULTI-MODE” or “ANY”, and specifies a RAT supported by the terminal. This field may be, for example, the values “GSM®”, “GSM® / GPRS”, “GSM® / GPRS / EDGE”, “UMTS FDD”, “UMTS TDD”, “IEEE802. 11a / b / g "," CDMA2000 "," IS-95 ". Field 1115 (“MODEL_TYPE”) is intended to contain an indication of the type of mobile communication terminal 110 and is present when the value contained in field 1105 is “MULTI-MODE” or “ANY”.

  The “CAPABILITY INFORMATION RESPONSE” message transmitted from the mobile communication terminal 110 to the RASD controller node 215 includes a “RECONF_TYPE” field 1105 set to “ANY” and a “SUPPORTED_RATs” field 1110 set to “GSM (registered trademark)”. And a “MODEL_TYPE” field 1115 that specifies the model of the terminal 110.

  Upon receipt of the “CAPABILITY INFORMATION RESPONSE” message, the RASD controller node 215 initiates a terminal reconfiguration download procedure in order to send a software module for connecting to the GSM® RAT to the mobile communication terminal 110 in this example. (Block 845).

  The terminal reconfiguration download procedure requires sending a “SOFTWARE DOWNLOAD INDICATION” message and a “DATA BLOCK” message to the mobile communication terminal 110, as schematically shown in the signaling diagram of FIG.

  The “SOFTWARE DOWNLOAD INDICATION” message is a single cast message having the general structure shown in FIG. The “SPECIFIC_DATA” field 420 has the structure shown in FIG. 12, which is a field 1205 (“RAT_TYPE”) (“RAT_TYPE”) intended to contain a value indicating the RAT supported by the downloaded software module. "Field 1205 can be, for example," GSM (registered trademark) "," GSM (registered trademark) / GPRS "," GSM (registered trademark) / GPRS / EDGE "," UMTS FDD "," UMTS TDD "," IEEE802 ". .11a / b / g "," CDMA2000 "," IS-95 ") and a field 1210 (" NUM_BLOCKS ") indicating the number of radio blocks in which the content is transmitted. The value contained in the “NUM_BLOCKS” field is used by the mobile communication terminal to determine the size of the reception window.

  The “DATA BLOCK” message is a single cast message having the general structure shown in FIG. The “SPECIFIC_DATA” field 420 has the structure shown in FIG. 13, which is a field 1305 (“BLOCK_NUM”) intended to contain a value indicating the sequence number of the radio block contained in the field 1315 (“DATA”). ) And a field 1310 (“BLOCK_LENGTH”) that is intended to contain a value indicating the size (eg, in bytes) of the field 1315, where the field 1315 contains data for the radio block.

  Upon receiving the first “SOFTWARE DOWNLOAD INDICATION” message from the RASD controller 215, the mobile communication terminal 110 initiates a terminal reconfiguration download procedure (block 847).

  In response to the message received from the RASD controller 215, the mobile communication terminal 110 transmits a “DATA ACK” message to the RASD controller 215 to acknowledge or deny receipt of the message from the RASD controller node. The “DATA ACK” message has the general structure shown in FIG. 4, and the “SPECIFIC_DATA” field 420 has the structure shown in FIG. 14, which includes the sequence number of the acknowledged radio block. It includes an intended field 1405 (“BLOCK_NUM”) and a field 1410 that is intended to include an indication of whether the receipt of the radio block has been acknowledged.

  When the terminal reconfiguration download procedure is completed, the RASD controller node 215 that knows the location of the mobile communication terminal 110 is present in the area where the mobile terminal 110 is located in the message field intended to contain the RIB list. A “COVERAGE INFORMATION RESPONSE” message (M4 in the drawing) including information about the RAT is generated and transmitted to the mobile communication terminal 110 (block 849).

  When the mobile communication terminal 110 receives the “COVERAGE INFORMATION RESPONSE” message, the mobile communication terminal 110 starts scanning the “RIB” list. The first “RIB” 1000 (corresponding to the RAT assigned the highest priority) is selected (block 851). The mobile communication terminal 110 checks whether it is configured for the RAT specified in the “RAT_TYPE” field 1005 of the “RIB” 1000 that was examined (block 853) and if so (block 853). Exit branch Y), the mobile communication terminal 110 connects to the RAT (block 855) and the indoor camping procedure ends. In a preferred embodiment, the mobile communication terminal 110 is a list of telecom operators preferred by the telecom operator indicated by the identifier in field 620, eg, one of the lists stored in the SIM (subscriber identity module) of that terminal. If yes, the mobile communication terminal can select that RAT, and if no, it can search for another RAT. Eventually, if none of the available RATs belong to the preferred telecom operator, the terminal can select the first available RAT. Alternatively, if the mobile communication terminal 110 is not configured for that RAT (exit branch N of block 853), the terminal checks to see if it already has the necessary software modules to self-configure for that RAT. (Block 857). If yes (exit branch Y), the mobile communication terminal 110 configures itself for the specified RAT (block 859), connects to that RAT (block 855), and if no (exit branch N of block 857). If there is an additional “RIB” 1000 (block 861, exit branch Y), select the next “RIB” 1000 for another RAT and repeat the above operations until a RAT is found that the mobile communication terminal can use. .

  The present invention is generally applicable in any heterogeneous wireless communication situation, including situations where DSA technology is implemented, whereby a telecom operator is free to use the licensed band and allocate it to the same or different RATs. Can be divided into possible subbands. With DSA technology, the network configuration can be made quite variable, for example depending on the traffic load in different systems. In situations where one of the heterogeneous systems is congested (because the number of requests exceeds the available radio resources), unused radio resources, eg, free carriers in adjacent network cells (belonging to the same system or different systems) Can be used. For example, the method for reconfiguring the BTS of the GSM (registered trademark) system and the method for carrier allocation described in published international application WO2006 / 064302 can be employed. In that case, a network entity that manages network radio resources (ie, a radio resource management (RRM) server) may provide information about spectrum allocation and respective RATs to the RASD controller node 215 so that the RASD controller node The mobile communication terminal can be notified of the change of the radio configuration. A typical mobile communication terminal is not concerned about how the RAT is dynamically reassigned, and based on the information received from the RASD controller node via the RASD channel, within the area where the terminal is located. Can access one of the available RATs.

  The present invention is also applicable to heterogeneous wireless communication situations where there are two or more telecom operators. Using the information received from the RASD controller node via the RASD channel, the mobile communication terminal uses the entire spectrum to detect which frequencies are authorized and managed by the telecom operator to which the terminal is subscribed. Can be obtained directly, reducing the time needed for camping. Once the frequency of the subscribing telecom operator is identified, the mobile communication terminal can proceed as described above to determine which RAT to connect to.

  The RASD channel may be an “out-of-band” channel or an “in-band” channel. In the first case, the RASD channel is a channel in a frequency band outside the licensed band assigned to the telecom operator, and for communication over the RASD channel, any radio transport technology, possibly a heterogeneous network. One of the RATs can be used. In the second case (in-band channel), the frequency band within the licensed band assigned to the telecom operator can be dedicated to the RASD channel. Alternatively, the RASD channel can be implemented as a “logical” channel in order to avoid losing one of the allocated frequencies by the telecom operator (eg, already in BCCH, PBCCH, CPICH, etc. New protocol messages sent over existing channels should be introduced into the standard, or new common logical control channels may be established).

  The present invention has been described herein with reference to an exemplary embodiment thereof. Those skilled in the art will appreciate that several variations of the described embodiments, as well as different embodiments, are possible within the scope of the present invention, all as defined in the appended claims, for example to meet the attendant needs. Easy to understand.

  For example, instead of GPS, various geographic location systems can be used, such as Galileo, Assisted GPS, Glonass, for example.

Claims (34)

A method for enabling connection of a mobile communication terminal (110) to a wireless communication network comprising:
Broadcasting information about radio access networks available in the geographical area (100) into the geographical area, the information including a current mobile communication terminal location in the geographical area and which radio access Intended to be used by the mobile communication terminal to determine what the network covers,
The information is associated with an identifier of at least one radio access network available within the geographic area and the identifier of the at least one radio access network, and coverage of the geographic area by the radio access network; And data adapted to determine a range.   The method of claim 1, wherein the at least one radio access network includes a list of radio access networks available within the geographic area.   3. The data of claim 1 or 2, wherein the data adapted to determine a coverage range of the geographic area by the radio access network includes geographic coordinates of at least one geographic point within the geographic area. The method described.   The method of claim 3, wherein the data adapted to determine a coverage range of the geographic area by the radio access network includes a length indication.   The geographic coordinates of at least one geographic point define a geographic location of the center of a circle, the length indication defines a radius of the circle, and the circle is the geographic area by the radio access network The method of claim 4, wherein the range of coverage is described.   The data adapted to determine a range of coverage of the geographic area by the radio access network is a geographic coordinate of at least two geographic points and describes the range of coverage of the geographic area The method of claim 3, comprising the geographic coordinates defining a vertex of a polygon.   If the radio access network covers the entire geographic area, the data adapted to determine the coverage area of the geographic area by the radio access network is such that the radio access network is the entire geographic area. 7. A method according to any one of claims 1 to 6, comprising an instruction to cover.   The method according to claim 1, wherein the identifier of the radio access network is in the form of a character string.   The step of broadcasting utilizes an out-of-band broadcast communication channel and the channel located in a frequency band outside the licensed band assigned to the radio access network existing in the geographical area of interest; 9. The method according to any one of claims 1 to 8, comprising.   Utilizing the channel, wherein the step of broadcasting is located within a frequency band within an authorized band assigned to the radio access network that is an in-band broadcast communication channel and is within the geographical area of interest. 9. The method according to any one of claims 1 to 8, comprising.   The method of claim 10, wherein the broadcast communication channel is defined as a logical channel of one of the radio access networks residing within the geographic area of interest. A wireless communication network comprising a network function (215) adapted to control broadcasting in said geographical area of information relating to available radio access networks available within the geographical area (100), The information is intended to be used by the mobile communication terminal (110) to determine which radio access network covers the current location of the mobile communication terminal within the geographical area;
The information is associated with an identifier of at least one radio access network available within the geographic area and the identifier of the at least one radio access network, and coverage of the geographic area by the radio access network; A wireless communication network including data adapted to determine a range.   The wireless communication network of claim 12, wherein the at least one radio access network includes a list of radio access networks available within the geographic area.   14. The data of claim 12 or 13, wherein the data adapted to determine a range of coverage of the geographic area by the radio access network includes geographic coordinates of at least one geographic point within the geographic area. The wireless communication network described.   The wireless communication network of claim 14, wherein the data adapted to determine a coverage range of the geographic area by the wireless access network includes a length indication.   The geographic coordinates of at least one geographic point define a geographic location of the center of a circle, the length indication defines a radius of the circle, and the circle is the geographic area by the radio access network 16. The wireless communication network of claim 15, which describes the range of coverage of a network.   The data adapted to determine a range of coverage of the geographic area by the radio access network is a geographic coordinate of at least two geographic points and describes the range of coverage of the geographic area 15. The wireless communication network of claim 14, including the geographic coordinates that define a vertex of a polygon.   If the radio access network covers the entire geographic area, the data adapted to determine the coverage area of the geographic area by the radio access network is such that the radio access network is the entire geographic area. 18. A wireless communication network according to any one of claims 12 to 17, comprising an instruction to cover.   The radio communication network according to any one of claims 12 to 18, wherein the identifier of the radio access network is in the form of a character string.   For the broadcast, an out-of-band broadcast communication channel is used that is located in a frequency band outside of a licensed band assigned to the radio access network that exists in the geographical area of interest. Item 20. The wireless communication network according to any one of Items 12 to 19.   The broadcast is utilized for an in-band broadcast communication channel that is located in a frequency band within a licensed band assigned to the radio access network residing in the geographic area of interest. The wireless communication network according to any one of 12 to 19.   The wireless communication network of claim 21, wherein the broadcast communication channel is defined as a logical channel of one of the radio access networks residing in the geographic area of interest. A move adapted to receive a broadcast of information from a wireless communication network into a geographic area (100) and available in the geographic area regarding an available radio access network A communication terminal, wherein the information is intended to be used by the mobile communication terminal to determine which radio access network covers the current location of the mobile communication terminal within the geographical area;
The mobile communication terminal includes a receiver adapted to receive the information, the information including an identifier of at least one radio access network available in the geographic area, and the at least one radio access network And a data adapted to determine a range of coverage of the geographic area by the radio access network in relation to the identifier of the mobile communication terminal. A radio base station of a wireless communication network adapted to broadcast information about available radio access networks available in a geographical area into the geographical area, the information comprising the geographical Intended to be used by a mobile communication terminal to determine which radio access network covers the current location of the mobile communication terminal within the area;
The information is associated with an identifier of at least one radio access network available within the geographic area and the identifier of the at least one radio access network, and coverage of the geographic area by the radio access network; A radio base station comprising data adapted to determine a range.   25. The radio base station of claim 24, wherein the at least one radio access network includes a list of radio access networks available within the geographic area.   26. The data of claim 24 or 25, wherein the data adapted to determine a range of coverage of the geographic area by the radio access network includes geographic coordinates of at least one geographic point within the geographic area. The radio base station described.   27. The radio base station of claim 26, wherein the data adapted to determine a coverage range of the geographic area by the radio access network includes a length indication.   The geographic coordinates of at least one geographic point define a geographic location of the center of a circle, the length indication defines a radius of the circle, and the circle is the geographic area by the radio access network 28. The radio base station according to claim 27, wherein the range of coverage is described.   The data adapted to determine a range of coverage of the geographic area by the radio access network is a geographic coordinate of at least two geographic points and describes the range of coverage of the geographic area 27. The radio base station according to claim 26, comprising the geographical coordinates defining a vertex of a polygon.   If the radio access network covers the entire geographic area, the data adapted to determine the coverage area of the geographic area by the radio access network is such that the radio access network is the entire geographic area. 30. The radio base station according to any one of claims 24 to 29, comprising an instruction to cover   The radio base station according to any one of claims 24 to 30, wherein the identifier of the radio access network is in a character string format.   For the broadcast, an out-of-band broadcast communication channel is used that is located in a frequency band outside the licensed band assigned to the radio access network that exists in the geographical area of interest. The radio base station according to any one of claims 24 to 31.   For the broadcast, an in-band broadcast communication channel is utilized that is located in a frequency band within a licensed band assigned to the radio access network that is in the geographical area of interest. Item 33. The radio base station according to any one of items 24 to 32.   34. A radio base station according to claim 33, wherein the broadcast communication channel is defined as a logical channel of one of the radio access networks residing within the geographical area of interest.

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