JP2013158050A - Mobile communication system, mobile station, exchange station, and position registration method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a network load resulting from selection changes of position registration devices, change of the number of the installed devices and the like at a line exchange network side.SOLUTION: The mobile communication system includes: a plurality of position registration devices managing a position of a mobile station on a line exchange network side; a first packet exchange station for selecting one position registration device from the plurality of position registration devices according to a predetermined rule and requesting a position registration when receiving a position registration request from the mobile station; the mobile station for transmitting the position registration request containing information for identifying the position registration device selected by the first packet exchange station; and a second packet exchange station for requesting the position registration to the position registration device the position registration of which the first packet exchange station performed for the mobile station.

Description

  The present invention relates to a mobile communication system, a mobile station, an exchange station, and a mobile station location registration method, and more particularly, to a mobile communication system in which a plurality of location registration apparatuses for managing the location of a mobile station on a circuit switched network side are arranged. The present invention relates to a mobile station, an exchange station, and a mobile station location registration method.

  Non-Patent Document 1 discloses a specification of a function called CS (Circuit Switched) fallback that realizes cooperation between LTE (Long Term Evolution) and 3G circuit switching service. In addition, in the section “4.3.2 MME” on page 11 of the same document, an MSC / VLR pool in which a plurality of MSC / VLRs (Mobile Switching Center / Visited Location Register) serve with the same Location Area Identity is configured. In this case, it is described that MME (Mobility Management Entity) should select MSC / VLR by the method of IMSI Hash method of Non-Patent Document 2. Note that the IMSI Hash method is a hash by modulo operation using two keys, the IMSI (International Mobile-Static Identification Identifier), which is an identifier that uniquely identifies a subscriber in the network, and the number of MSC / VLRs in the network. This is a method for obtaining.

  Further, in Patent Document 1, when a UE (User Equipment) first accesses a pool configured by SGSN (Serving GPRS Support Node) or the like, a RAN node such as e-NodeB is connected to an NNSF (Non It is described to select an appropriate CN (Core Network) node for the UE according to the Access Stratum Node Selection Function) and load sharing principle. Furthermore, in Patent Document 1, the RAN node is originally registered by using the NRI (Network Resource Identifier) in the TMSI (Temporary Mobile Station Identifier) included in the initial direct transfer message received from the UE. It describes searching for and selecting a CN (Core Network) node. That is, as long as UE of patent document 1 moves in a pool, a CN node does not change.

  Further, in Patent Document 2, a location area update response (LAU response) including an NRI is received from an MSC in an MME that converts a tracking area update request (TAU request) from a UE into a location area update request (LAU request). And MME which converts into tracking area update response (TAU response) with respect to UE is disclosed.

Special table 2010-537523 Special table 2011-50896 gazette

3GPP TS 23.272 ver.10.4.0 “Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2 (Release 10)”, [Search June 20, 2011], Internet <http: // www. 3gpp.org/ftp/Specs/html-info/23272.htm> 3GPP TS 23.236 ver.10.2.1 “Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes (Release 10)”, [Search June 20, 2011], Internet <http: //www.3gpp.org/ftp/Specs/html-info/23236.htm>

  The following analysis is given by the present invention. In the IMSI Hash system described in Non-Patent Document 2, the UE refers to another packet switching station (hereinafter referred to as “new packet switching station”) from the packet switching station before moving (hereinafter referred to as “old packet switching station”). This is also used when the new packet switching center selects a location registration device (MSC / VLR) that performs location registration when the UE moves to.

  At this time, if the location registration area (Location Area) to which the UE moves is within the same location registration device pool (MSC / VLR pool), the new packet switching center The same location registration device (MSC / VLR) as the location registration device (MSC / VLR) registered by the packet switching center can be selected. In this way, by performing location registration without moving the location registration device (MSC / VLR), it is possible to reduce the load on the network.

  In particular, when a packet switching center cooperates with a location registration device (MSC / VLR) for the purpose of delivering SMS (Short Message Service), the location registration device pool (MSC / VLR) has a relatively large location registration device pool (MSC / VLR). Since the VLR pool is configured, the above-described network load reduction is more effective.

  However, when a failure occurs in the path between the location registration device (MSC / VLR) to be selected and the old packet switching center, the old packet switching center, as shown in FIG. VLR) may be selected (see S902 to S904 in FIG. 12). Thereafter, when the UE moves to the new packet switching center and makes a location registration request, the new packet switching center selects a location registration device (MSC / VLR) using the IMSI Hash method (see S911 to S912 in FIG. 12). ). At this time, since the IMSI Hash method is to obtain a hash by modulo operation using two of the IMSI and the number of MSC / VLR as keys as described above, the new packet switching center uses the same location registration apparatus as S902 in FIG. (MSC / VLR) is selected (see S911 to S912 in FIG. 12). As a result, since a location registration device (MSC / VLR) that has not been registered is selected, an unnecessary signal message is transmitted and received in the network.

  Furthermore, as shown in FIG. 13, when the number of MSC / VLRs belonging to the location registration device pool (MSC / VLR pool) increases or decreases, the location registration device (MSC / VLR) selected by the IMSI Hash changes. Therefore, the reselection of the location registration device (MSC / VLR) is performed in most UEs that have already been registered for location, leading to congestion of the entire network.

  In Patent Documents 1 and 2, as described above, the configuration for selecting a location registration device that has already been registered after the mobile station has moved, as well as the selection of the location registration device that constitutes the location registration device pool as described above. Not disclosed.

  The present invention has been made in view of the above-described circumstances, and its object is to select and change the number of location registration devices on the circuit switching network side such as the location registration device (MSC / VLR), and the number of installations. It is an object of the present invention to provide a mobile communication system, a mobile station, an exchange station, and a mobile station location registration method capable of suppressing transmission / reception of unnecessary signal messages and network congestion caused by increase / decrease in traffic.

  According to a first aspect of the present invention, there is provided a mobile communication system including a mobile station, an MME (Mobility Management Entity), and a plurality of location registration devices capable of managing the location of the mobile station. In response to a location registration request from the mobile station, a specific location is selected from the plurality of location registration devices based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the location registration request. A mobile communication system for selecting a registration device is provided.

  According to a second aspect of the present invention, there is provided a mobile station used in a mobile communication system including an MME (Mobility Management Entity) and a plurality of location registration devices capable of managing the location of the mobile station, The station includes transmission means for sending a location registration request including an NRI (Network Resource Identifier) to the MME, and a specific location from the plurality of location registration devices based on the NRI provided from the mobile station. A mobile station is provided that allows the MME to select a registration device.

  According to a third aspect of the present invention, there is provided an MME (Mobility Management Entity) used in a mobile communication system including a mobile station and a plurality of location registration devices capable of managing the location of the mobile station, Upon receiving a location registration request from a mobile station, a specific location registration device is selected from the plurality of location registration devices based on TMRI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the location registration request. An MME having selection means for selecting is provided.

  According to a fourth aspect of the present invention, there is provided a communication method for a mobile communication system including a mobile station, an MME (Mobility Management Entity), and a plurality of location registration devices capable of managing the location of the mobile station. The MME receives a location registration request from the mobile station, and based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the location registration request, from among the plurality of location registration devices A communication method of a mobile communication system for selecting a specific location registration device is provided.

  According to the present invention, it is possible to suppress the exchange of unnecessary signal messages and the congestion of the network due to the selection change of the location registration device on the circuit switched network side, the increase or decrease of the number of installations, and the like.

It is a figure for demonstrating the structure of one Embodiment of this invention. FIG. 2 is a continuation diagram of FIG. 1. It is a figure for demonstrating the structure of the 1st Embodiment of this invention. It is a sequence diagram for demonstrating the operation | movement of the 1st Embodiment of this invention. It is a figure for demonstrating the structure of the 2nd Embodiment of this invention. It is a sequence diagram for demonstrating the operation | movement of the 2nd Embodiment of this invention. It is a figure for demonstrating the structure of the 3rd Embodiment of this invention. It is a sequence diagram for demonstrating the operation | movement of the 3rd Embodiment of this invention. It is a figure for demonstrating the structure of the 4th Embodiment of this invention. It is a sequence diagram for demonstrating operation | movement of the 4th Embodiment of this invention. It is a sequence diagram for demonstrating operation | movement of the 5th Embodiment of this invention. It is a figure for demonstrating the flow of the position registration process by the system of a nonpatent literature 1,2. It is a figure for demonstrating another flow of the position registration process by the system of a nonpatent literature 1,2.

  First, an outline of an embodiment of the present invention will be described with reference to the drawings. Note that the reference numerals of the drawings attached to this summary are attached to the respective elements for convenience as an example for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiment.

  As shown in FIG. 1, the present invention provides a plurality of location registration devices 31 to 3 n that manage location of a mobile station on the circuit switched network side and a predetermined location when receiving a location registration request from a UE (mobile station) 10. The first switching center (first packet switching center) 21 that requests location registration by selecting one location registration device from among the plurality of location registration devices 31 to 3n and the UE (mobile) Station) 10 and a second switching center (second packet switching center) 22 located at the destination of the mobile station.

  Specifically, the UE (mobile station) 10 selects a location registration device selected by the first switching center (first packet switching center) 21 from a first switching center (first packet switching center) 21. A location registration response including information S1 for specifying is received. Then, as shown in FIG. 2, when moving from the service area of the first exchange (first packet exchange) 21 to the service area of the second exchange (second packet exchange) 22, the UE ( The mobile station 10, with respect to the second switching center (second packet switching center) 22, information S 2 for specifying the location registration device selected by the first switching center (first packet switching center) 21. A location registration request including is transmitted. The second switching center (second packet switching center) 22 performs location registration where the first packet switching center has performed location registration for the mobile station based on the information S1 included in the location registration request. Request location registration to the device 31.

  As described above, according to the present invention, also in the second switching center (second packet switching center) 22, the location registration in which the first switching center (first packet switching center) 21 actually performed the location registration is performed. A device selection is made. Accordingly, it is possible to suppress the exchange of unnecessary signal messages and the congestion of the network due to the selection change of the position registration device on the circuit switching network side of the mobile station, the increase / decrease of the number of installations, and the like. The information S2 included in the location registration request indicates that the UE (mobile station) 10 has registered in a location registration device (location registration device not belonging to the pool) different from the location registration devices 31 to 3n. In the case shown, the second switching center (second packet switching center) 22 is similar to the first switching center (first packet switching center) 21 in accordance with a predetermined rule. One location registration device is selected from 3n, and location registration is requested.

[First Embodiment]
Next, first to fourth embodiments of the present invention using NRI (Network Resource Indicator) as information for specifying a location registration apparatus will be described in detail with reference to the drawings. FIG. 3 is a diagram schematically showing the configuration of the first exemplary embodiment of the present invention.

  Referring to FIG. 3, a plurality of MSC / VLRs 301 to 30n constituting an MSC / VLR pool for performing location management of UE (mobile station) 10 on the circuit switched network side, and movement of UE 10 arranged on the circuit switched network side A network configuration including SGSNs 201 and 202 that perform management, authentication processing, and the like is shown. In the example of FIG. 3, various RAN nodes, various gateways, and the like described in Patent Document 1 are omitted. Note that the MSC / VLR pool is a structure in which a plurality of MSC / VLRs are configured to provide services to the same location registration area (LA).

  When receiving the location registration request from the UE 10, the SGSN 201 (202) selects the MSC / VLR that performs location registration for the UE 10 from the MSC / VLR 301 to 30n according to a predetermined rule such as the IMSI Hash method of Non-Patent Document 2. And request location registration. The selected MSC / VLR transmits a location registration response including a TMSI (Temporary Mobile Station Identifier) to the UE 10 via the SGSN 201 (202).

  Here, the TMSI includes an NRI that is an information element that can uniquely identify the MSC / VLR in the MSC / VLR pool.

  The UE 10 provides the NSG to the new SGSN 202 (201) at the time of a location registration request, thereby causing the SGSN 202 (201) to select an MSC / VLR for which location registration has been completed. At this time, if the MSC / VLR indicated by the NRI is an MSC / VLR in the same MSC / VLR pool, the SGSN 202 (201) is located with respect to the MSC / VLR where the UE 10 has been registered before the movement. You will be asked to register.

  Next, the operation of this embodiment will be described in detail with reference to the drawings. FIG. 4 is a sequence diagram for explaining the operation of the first exemplary embodiment of the present invention. In the following description, SGSN 201 is referred to as “old SGSN”, and SGSN 202 is referred to as “new SGSN”.

  Referring to FIG. 4, first, UE 10 transmits a location registration request (Attach Request, Routing Area Update Request, etc.) to the old SGSN (S001 in FIG. 4). The old SGSN that has received the location registration request selects an MSC / VLR using the IMSI Hash method of Non-Patent Document 2 and transmits a location registration request (Location Request) (S002 in FIG. 4).

  The MSC / VLR that has received the location registration request (Location Request) performs location registration of the UE 10, and further assigns TMSI including the NRI corresponding to the own device (S003 in FIG. 4). Further, the MSC / VLR transmits a location registration response (Location Response) to the old SGSN (S004 in FIG. 4).

  The old SGSN holds the TMSI, VLR Name, or VLR Number included in the location response (S004-1 in FIG. 4). Thereafter, the old SGSN transmits a location registration response (Attach Accept, Routing Area Update Accept, etc.) including the TMSI to the UE 10 (S005 in FIG. 4).

  Thereafter, when the UE 10 moves under the new SGSN, the UE 10 transmits a location registration request (Attach Request, Routing Area Update Request, etc.) including TMSI to the new SGSN (S011 in FIG. 4).

  The new SGSN that has received the location registration request extracts the NRI from the TMSI included in the location registration request. The new SGSN further transmits a location registration request (Location Request) to the MSC / VLR corresponding to the NRI (S012 in FIG. 4).

  The MSC / VLR that has received the location registration request only updates the location registration area because the location registration of the UE 10 has been completed, and returns a location registration response (Location Response) (S015 in FIG. 4).

  The new SGSN holds the TMSI, VLR Name, or VLR Number included in the location response (Location Response) (S015-1 in FIG. 4). The new SGSN returns a location registration response (Attach Accept, Routing Area Update Accept, etc.) to the UE 10 based on the location registration response (Location Response) received from the MSC / VLR (S016 in FIG. 4).

  As described above, according to the present embodiment, the location registration device that the old SGSN 201 actually registered the location is selected. For this reason, for example, even if a failure occurs in the route between the old SGSN 201 and the MSC / VLR that the old SGSN 201 first selected or the number of MSC / VLRs varies, the same is not affected. It is possible to register the location of the UE 10 with the MSC / VLR. As a result, unnecessary messages do not flow through the network, and the load on the network is reduced.

[Second Embodiment]
Subsequently, a second embodiment of the present invention in which the new SGSN (SGSN 202) of the first embodiment described above is replaced with an MME will be described. FIG. 5 is a diagram schematically showing the configuration of the second exemplary embodiment of the present invention. The difference from the first embodiment shown in FIG. 3 is that SGSN 202 is replaced with MME 212.

  The MME 212 is an exchange station arranged on the packet switching network side, and performs mobility management, authentication processing, and the like of the UE 10 in the same manner as the SGSN described above.

  Next, the operation of this embodiment will be described in detail with reference to the drawings. FIG. 6 is a sequence diagram for explaining the operation of the second exemplary embodiment of the present invention. In the following description, SGSN 201 is referred to as “old SGSN” and MME 212 is referred to as “new MME”.

  The operation of the present embodiment is the only difference in that the new SGSN of the first embodiment is replaced with the new MME. Specifically, in S011A of FIG. 6, the UE 10 makes a location registration request (Attach Request) to the new MME. , Tracking Area Update Request, etc.) is transmitted, and in S016A of FIG. 6, the new MME transmits a location registration response (Attach Accept, Tracking Area Update Accept, etc.) to the UE 10. Since other basic operations are the same as those in the first embodiment, description thereof will be omitted.

  As described above, the present invention can also be applied when the UE 10 moves from the subordinates of the old SGSN to the subordinates of the MME. To the location registration apparatus in which the old SGSN has actually registered the location to the new MME. It is possible to make a location registration request.

[Third Embodiment]
Next, a third embodiment of the present invention in which the old SGSN (SGSN 201) of the first embodiment described above is replaced with an MME will be described. FIG. 7 is a diagram schematically showing the configuration of the third exemplary embodiment of the present invention. The difference from the first embodiment shown in FIG. 3 is that SGSN 201 is replaced with MME 211.

  The MME 211 is an exchange station arranged on the packet switching network side, and performs mobility management, authentication processing, and the like of the UE 10 in the same manner as the SGSN described above.

  Next, the operation of this embodiment will be described in detail with reference to the drawings. FIG. 8 is a sequence diagram for explaining the operation of the third embodiment of the present invention. In the following description, the MME 211 is referred to as an “old MME”, and the SGSN 202 is referred to as a “new SGSN”.

  The operation of the present embodiment is the difference that only the old SGSN of the first embodiment is replaced with the old MME. Specifically, in S001A of FIG. 8, the UE 10 makes a location registration request (Attach Request) to the old MME. , Tracking Area Update Request, etc.) is transmitted, and in S005A of FIG. 8, the old MME transmits a location registration response (Attach Accept, Tracking Area Update Accept, etc.) to UE10. Since other basic operations are the same as those in the first embodiment, description thereof will be omitted.

  As described above, the present invention can also be applied to the case where the UE 10 moves from the state under the control of the old MME to the control of the SGSN, and the location where the old MME has actually registered the location in the new SGSN. It is possible to make a location registration request to the registration device.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention in which the old SGSN (SGSN 201) and the new SGSN (SGSN 202) of the first embodiment described above are replaced with MME will be described. FIG. 9 is a diagram schematically showing the configuration of the fourth exemplary embodiment of the present invention. The difference from the first embodiment shown in FIG. 3 is that SGSNs 201 and 202 are replaced with MMEs 211 and 212, respectively.

  The MMEs 211 and 212 are switching stations arranged on the packet switching network side, and perform mobility management, authentication processing, and the like of the UE 10 in the same manner as the SGSN described above.

  Next, the operation of this embodiment will be described in detail with reference to the drawings. FIG. 10 is a sequence diagram for explaining the operation of the fourth embodiment of the present invention. In the following description, the MME 211 is referred to as “old MME” and the MME 212 is referred to as “new MME”.

  The operation of this embodiment is the difference in that the old SGSN and the new SGSN of the first embodiment are replaced with the old MME and the new MME, respectively. Specifically, in S001A and S011A of FIG. A location registration request (Attach Request, Tracking Area Update Request, etc.) is transmitted to the MME, and in S005A and S016A in FIG. Is a point to transmit. Since other basic operations are the same as those in the first embodiment, description thereof will be omitted.

  As described above, the present invention can also be applied when the UE 10 moves from the state under the control of the old MME to the control of the MME, and the location where the old MME has actually registered the location in the new MME. It is possible to make a location registration request to the registration device.

[Fifth Embodiment]
In the first to fourth embodiments described above, the information specifying the location-registered MSC / VLR is transmitted to the new switching center via the UE 10, but the old switching center is directly located at the new switching center. A configuration for transmitting information for specifying registered MSC / VLR can also be adopted.

  Hereinafter, a fifth embodiment of the present invention will be described in which an MSC / VLR whose location has been registered for the UE 10 can be selected without using an NRI from the UE 10. Since the present invention can be realized with the same configuration as the first to fourth embodiments described above, the following description will focus on the differences in operation. Moreover, in the following description, it demonstrates as what has the structure which has old MME and new MME shown in FIG.

  FIG. 11 is a sequence diagram for explaining the operation of the fifth exemplary embodiment of the present invention. In the following description, the MME 211 is referred to as “old MME” and the MME 212 is referred to as “new MME”.

  Referring to FIG. 11, first, the UE 10 transmits a location registration request (Attach Request, Tracking Area Update Request, etc.) to the old MME (S201 in FIG. 11). The old MME that has received the location registration request selects an MSC / VLR using the IMSI Hash method of Non-Patent Document 2, and transmits a location registration request (Location Request) (S202 in FIG. 11).

  The MSC / VLR that has received the location registration request (Location Request) performs location registration of the UE 10 and transmits a location registration response (Location Response) (S204 in FIG. 11). The old MME transmits a location registration response (Attach Accept, Tracking Area Update Accept, etc.) to the UE 10 (S205 in FIG. 11). Note that the location registration response here does not have to include the NRI. Further, the old MME holds the VLR Name or VLR Number that is the transmission source of the location registration response (S204-1 in FIG. 11).

  Thereafter, when the UE 10 moves under the control of the new MME, the UE 10 transmits a location registration request (Attach Request, Tracking Area Update Request, etc.) to the new MME (S211 in FIG. 11).

  The new MME that has received the location registration request requests the old MME to transfer the context of the UE 10 (Identification Request, Context Request) (S212 in FIG. 11). In the case of this embodiment, TMSI is not included in the location registration request transmitted in S211 of FIG. 11, but information specifying the UE 10 is included. The new MME uses the information specifying the UE 10 as information specifying the location registered MSC / VLR.

  Upon receiving the Context transfer request, the old MME transmits a Context transfer response (Context Response) including the TMSI, VLR Name, or VLR Number that it holds (S213 in FIG. 11).

  The new MME that has received the Context Transfer Response (Context Response) sends a location registration request to the MSC / VLR specified by the TMSI, VLR Name, or VLR Number included in the Context Transfer Response (Context Response). (Location Request) is performed (S214 in FIG. 11).

  Since the MSC / VLR has already registered the location of the UE 10, it only updates the location registration area and returns a location registration response (Location Response) (S215 in FIG. 11).

  Further, the new MME holds the VLR Name or VLR Number of the transmission source of the location registration response (Location Response) received from the MSC / VLR (S215-1 in FIG. 11). Further, the new MME returns a location registration response (Attach Accept, Tracking Area Update Accept, etc.) to the UE 10 based on the location registration response (Location Response) received from the MSC / VLR (S216 in FIG. 11). .

  As described above, according to the present embodiment, the location registration to the location registration device in which the old MME 211 has actually performed location registration is performed without going through the UE 10. Also in the present embodiment, for example, even if a failure occurs in the path between the old MME 211 and the MSC / VLR that was first selected by the old MME 211 or the number of MSC / VLRs varies, there is no effect. The location registration of the UE 10 can be performed in the same MSC / VLR.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and further modifications, substitutions, and adjustments are possible without departing from the basic technical idea of the present invention. Can be added. For example, in the first to fourth embodiments described above, the NRI is used as information for specifying the location registered MSC / VLR. However, the VLR Name or VLR Number described in the fifth embodiment is used. Can also be used.

  Similarly, in the fifth embodiment described above, NRI can also be used as information for specifying the location registered MSC / VLR.

  The disclosures of the above-mentioned patent documents and non-patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiment can be changed and adjusted based on the basic technical concept. Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

10 UE (mobile station)
21 First switching center 22 Second switching center 31 to 3n Location registration device 201, 202 SGSN
211, 212 MME
301-30n MSC / VLR

According to a first aspect of the present invention, there is provided a mobile communication system including a mobile station, an MME (Mobility Management Entity), and a plurality of location registration devices capable of managing the location of the mobile station. Receives the Attach Request from the mobile station, and based on the TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the Attach Request , the plurality of location registration devices among the plurality of location registration devices A mobile communication system for selecting is provided.

According to a second aspect of the present invention, there is provided a mobile station used in a mobile communication system including an MME (Mobility Management Entity) and a plurality of location registration devices capable of managing the location of the mobile station, The station is provided with a transmission means for sending an Attach Request including an NRI (Network Resource Identifier) to the MME, and based on the NRI provided from the mobile station, a specific location registration from the plurality of location registration devices A mobile station is provided that causes the MME to select a device.

According to a third aspect of the present invention, there is provided an MME (Mobility Management Entity) used in a mobile communication system including a mobile station and a plurality of location registration devices capable of managing the location of the mobile station, Upon receiving an Attach Request from a mobile station, a location registration device that selects a location from among the plurality of location registration devices based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the Attach Request An MME having a selection means is provided.

According to a fourth aspect of the present invention, there is provided a communication method for a mobile communication system including a mobile station, an MME (Mobility Management Entity), and a plurality of location registration devices capable of managing the location of the mobile station. The MME receives an Attach Request from the mobile station and is registered based on a plurality of specific locations among the plurality of specific locations based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the Attach Request . A communication method of a mobile communication system for selecting a location registration device is provided.

Claims (8)

A mobile communication system including a mobile station, MME (Mobility Management Entity), and a plurality of location registration devices capable of managing the location of the mobile station,
The MME receives a location registration request from the mobile station and is identified from the plurality of location registration devices based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the location registration request. A mobile communication system characterized by selecting a location registration device. An MME (Mobility Management Entity) used in a mobile communication system including a mobile station and a plurality of location registration devices capable of managing the location of the mobile station,
Upon receiving a location registration request from the mobile station, a specific location registration device is selected from the plurality of location registration devices based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the location registration request. MME characterized by having selection means for selecting. A mobile station used in a mobile communication system including an MME (Mobility Management Entity) and a plurality of location registration devices capable of managing the location of the mobile station,
The mobile station includes transmission means for sending a location registration request including an NRI (Network Resource Identifier) to the MME,
A mobile station characterized by causing the MME to select a specific location registration device from the plurality of location registration devices based on the NRI provided from the mobile station. A communication method of a mobile communication system including a mobile station, MME (Mobility Management Entity), and a plurality of location registration devices capable of managing the location of the mobile station,
The MME receives a location registration request from the mobile station and is identified from the plurality of location registration devices based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the location registration request. A communication method for a mobile communication system, comprising: selecting a location registration device. A method of controlling MME (Mobility Management Entity) used in a mobile communication system including a mobile station and a plurality of location registration devices capable of managing the location of the mobile station,
Upon receiving a location registration request from the mobile station, a specific location registration device is selected from the plurality of location registration devices based on a TMSI (Temporary Mobile Station Identifier) -based NRI (Network Resource Identifier) in the location registration request. A method for controlling the MME, characterized in that: A mobile station communication method used in a mobile communication system including an MME (Mobility Management Entity) and a plurality of location registration devices capable of managing the location of the mobile station,
The mobile station sends a location registration request including an NRI (Network Resource Identifier) to the MME,
A mobile station communication method comprising causing the MME to select a specific location registration device from the plurality of location registration devices based on the NRI provided from the mobile station.   2. The mobile communication system according to claim 1, wherein the location registration device is a mobile switching center / visited location register (MSC / VLR).   The communication method according to claim 4, wherein the location registration device is a mobile switching center / visited location register (MSC / VLR).

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