JP2009296098A - Mobile communication system, and call connection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem, wherein urgent call reception and call transmission cannot be carried out when a terminal is present, inside an area where it is not subjected to position registration of a service domain due to the changeover of a communication method. <P>SOLUTION: In this mobile communication system, when a terminal is present in an area where it is not subjected to position registration of a second communication method, when being changed over to a second communication method in process of communication using a first communication method, and notifies information related to a call required for reception of the call, one related to the terminal and related to the area where a position is registered to a first exchange center administering the area from the area, the first exchange center identifies the area where the terminal is subjected to position registration, based on the information related to the call, one related to the terminal and related to the area where the position is registered; transfers the information related to the call and that related to the terminal to the second exchange center administering the area; and connects the call in the second communication method to the terminal through a first base station, by using the information related to the call subjected to communication between the first and second exchange centers, and that related to the terminal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mobile communication system that performs wireless communication, and more particularly, to a mobile communication system that supports a plurality of communication schemes.

  At present, 3GPP (3rd Generation Partnership Project) is an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) system and a core network for accommodating the system as LTE (Long Term Evolution) which is an advanced form of 3G access system. EPC (Evolved Packet Core) is being developed. These new mobile communication systems include an eNodeB (evolved NodeB) that is a base station that provides LTE access, an MME (Mobility Management Entity) that performs mobility management, and the like.

  The 3G mobile network provides services divided into two domains: a CS (Circuit Switched) domain that mainly handles voice services and a PS (Packet Switched) domain that handles packet switched services. And the terminal (UE: User Equipment) used for the said service can access both domains simultaneously.

  On the other hand, E-UTRAN (LTE) provides only the PS domain function without providing the CS domain function. Voice and other services provided in the conventional CS domain provide services by utilizing VoIP (Voice over IP) technology based on the IMS (IP Multimedia Subsystem) base on PS access.

  However, a communication carrier that provides a communication service does not want to make an excessive capital investment for E-UTRAN (LTE) with a small number of users (subscribers) at the initial stage of provision. In such a case, a multi-mode terminal (also called a dual-mode terminal, a multi-access terminal, etc.) that uses the conventional 3G-CS access for voice communication and uses the new E-UTRAN (LTE) for packet communication is used. The

  However, even a multi-mode terminal that supports both 3G and E-UTRAN (LTE) can use 3G access and LTE access only in a mutually exclusive manner.

  For example, even in a multi-mode terminal that supports both W-CDMA / E-UTRAN (LTE) access, 3G-CS access is used while PS access is used in E-UTRAN (LTE). I can't. A similar limitation exists between 1xCS (CS access) and 1xEV-DO (PS access) in a CDMA2000 system, for example, using 1xCS access radio access while using 1xEV-DO. I can't.

  This means that even if an incoming voice call is received during data communication using a multimode terminal, the incoming voice call cannot be immediately answered. In such a case, a signal (Paging signal) for notifying an incoming voice call is transmitted to the multimode terminal using the PS access, and the mode of the multimode terminal is switched to the CS access to respond to the incoming voice call. Thereby, it is possible to prevent call loss of a voice call that occurs during data communication.

  Specifically, the multi-mode terminal that has received the Paging signal notified by E-UTRAN (LTE) access switches wireless access to 3G-CS and transmits a CM Service Request message to the MSC (Mobile Switching Center). This makes it possible to respond to Paging.

  The above operation of the mobile communication system will be described with reference to FIGS. FIG. 1 is a diagram illustrating a UTRAN (W-CDMA) / E-UTRAN (LTE) system configuration. FIG. 2 is a communication sequence diagram of the mobile communication system. The terms used are those used by 3GPP.

  Referring to FIG. 2 in conjunction with FIG. 1, the connection operation in UTRAN (W-CDMA) / E-UTRAN (LTE) operates as follows.

1. An IAM (Initial Address Message) arrives at the GMSC 10 (Gateway MSC).

2. The GMSC 10 sends a MAP-SRI (Send Routing Information) message to the HLR 11 (Home Location Register) in order to search for an MSC to which the call is to be transferred.

3. The HLR 11 sends a MAP-PRN (Provide Roaming Number) message to the MSC 12 registered by the UE 30 receiving the call.

4. The MSC 12 that has received the PRN performs a call (pre-page) operation of the UE 30. At this time, when the UE 30 is using E-UTRAN, since the UE 30 cannot receive a paging message via 3G-CS access (UTRAN access), the MSC 12 calls the UE 30 via E-UTRAN access. A Page Request message is sent to the MME (Mobility Management Entity) 13 to request the UE 30 to be called.

5. The MME 13 sends a PAGING signal so as to notify the UE 30 of the incoming call of the CS call via the E-UTRAN access.

6. Upon receiving the PAGING signal, the UE 30 switches the radio access system to be used to 3G-CS access, transmits a CM Service Request message to the 3G-CS network, and responds to the CS call.

7. When the CM Service Request message transmitted by the UE 30 arrives at the MSC 12, the MSC 12 issues an MSRN (Mobile Station Roaming Number) that can accept a call to the HLR 11, and a response to the received PRN message (PRN response) Is sent out.

8. The HLR 11 that has received the PRN message response sends an SRI message response (SRI response) to the GMSC 10 together with the MSRN.

9. The GMSC 10 that has received the response of the SRI message sends an IAM signal to the MSC 12.

10. Based on the various information, the establishment of the voice call between the caller and the UE 30 is completed.

  The above description is the system operation of W-CDMA / LTE. Similarly, in the CDMA2000 system, it is possible to respond to Paging by switching a multimode terminal that has been paging from EV-DO access to 1xCS. In 3GPP, the above function is named the CS-Fallback function.

  As a communication service technique using a related multi-mode terminal, the techniques described in Patent Documents 1 and 2 can be cited.

  Patent Document 1 describes a dual terminal that can use a plurality of communication services. Patent Document 1 also describes that a dual terminal registers its location, registers its location again in response to changes in the communication environment, and the like.

  Patent Document 2 describes a mobile communication system conforming to cdma2000 that switches between PS access and CS access. Patent Document 2 describes a method in which the mobile communication system performs Paging processing via PS access for incoming calls from a CS access to a multimode terminal that is performing PS access.

JP 2005-080197 A JP 2007-201923 A

  Next, problems to be solved by the present invention will be described. The function that makes it possible to respond when there is an incoming voice call while performing data communication using the above-described multi-mode terminal is that when the multi-mode terminal makes a call on the PS access side, When switching to access, it is assumed that the CS access system (switching office) that requested the call can always be accessed. That is, when switching from PS access to CS access due to movement of multi-mode terminals, area deployment, geographical and environmental factors, etc., it belongs to an LA (Location Area) different from the LA (Location Area) belonging to the exchange that requested the call. If only the base station can be accessed, call loss occurs.

  When described using a UTRAN (W-CDMA) / E-UTRAN (LTE) mobile communication system having a pre-page function (a function of starting a call with a PRN message as a trigger), a multi-mode terminal is a mobile communication system. When an incoming call of 3G access is called via E-UTRAN access, the mobile terminal tries to access the MSC that requested the call by switching to 3G access and responding.

  That is, when switching from E-UTRAN (LTE) to 3G due to movement of multi-mode terminals, area deployment, geographical and environmental factors, etc., the LA (Location Area) different from the LA (Location Area) to which the MSC that requested the call belongs CM Service Request is transmitted to an MSC different from the caller MSC when only the NodeB belonging to the network can be accessed. In this case, the MSC discards the message or recognizes that the UE cannot access the caller's MSC (such as detecting that the previously registered LA is different from the LA that is currently accessible) and performs response processing. Or interrupt.

  The operation of the mobile communication system in question will be described with reference to FIGS. FIG. 3 is a communication sequence diagram at the time of call loss in the mobile communication system. FIG. 4 is a diagram illustrating the occurrence of call loss in an exemplary UTRAN (W-CDMA) / E-UTRAN (LTE) system configuration. 3 and 4 correspond to the configurations and operations in FIGS. 1 and 2, and detailed description thereof will be omitted.

  3 and 4, when UE 30 is registered in UTRAN LA1 20 and E-UTRAN 21, if a PAGING signal of a CS (voice) call from MME 13 arrives, UE 30 switches access to UTRAN. Try to respond to PAGING. However, at that time, the NodeB (base station managed by the MSC 12) belonging to the UTRAN LA1 20 cannot be found for some reason, and only the NodeB (base station managed by the MSC 14) belonging to the UTRAN LA2 22 can be found. If not, you will not be able to respond to PAGING. Even if the base station responds, a response message (CM Service Request, CM service request) is transmitted to the UE 30 or the MSC 2 14 that does not know the incoming call information. The MSC2 14 identifies the response message (CM Service Request) as unnecessary information and discards it. As a result, CS (voice) calls are lost.

  The above-mentioned problem is a problem when an incoming call is made to a multimode terminal, but also has a problem when a call is made. Multi-mode terminals are registered even when making a call while using PS access, and switching from PS access to CS access due to multi-mode terminal movement, area deployment, geographical and environmental factors, etc. If only a base station belonging to an LA that is different from the LA belonging to the exchange that has been completed (to request a call) can be accessed, the call cannot be made until the location registration processing is performed.

  In the above state, a normal call process is performed after the location registration process, so that the call fails or takes a very long time from the user's viewpoint. Especially when roaming or the like, if location registration takes a lot of time, the waiting time of the user at the time of making a call becomes long, and the dissatisfaction of the user increases.

  In the mobile communication system described in the cited document 2, the above call loss is avoided on condition that some conditions are satisfied. Specifically, in the mobile communication system described in the cited document 2, during the PS access, the mobile terminal stops the PS access at a certain time, a certain distance, or at the time of the PS access handover, and the CS access notification information. (Information including information for identifying the base station and the exchange) is confirmed. If it is necessary to switch the CS access switching center, a CS access handoff process (such as a mobile terminal registration process) is performed. By operating in this way, a voice call or the like via CS access can be connected.

  However, even when the method described in the cited document 2 is used, it is impossible to respond to an incoming call via CS access until the CS access handoff process is performed when switching of the CS access switching center is necessary. Specifically, a call loss occurs when a movement from a jurisdiction MSC to another MSC at the time of registration of location information is made in a movement without a PS access handover within a certain time and a certain distance. Call loss is also multiplied when access to the jurisdiction MSC is not possible due to changes in the radio wave environment or the like. In addition, no consideration has been given to the problem at the time of calling.

  In view of the above problem at the time of an incoming call, an object of the present invention is to exchange a PAGING signal (position registered) when a 3G-CS call is received using the CS-Fallback function in the E-UTRAN service area. It is an object of the present invention to provide a mobile communication system capable of receiving an incoming call without causing a call loss when there is a response from a terminal to a different switching center.

  Another object of the present invention is that when a 3G-CS call is being sent from a terminal while using E-UTRAN access, a call request from the terminal is made to a switching center different from the location-registered switching center. It is an object of the present invention to provide a mobile communication system that can make a call without performing relocation registration.

  A mobile communication system according to the present invention is a mobile communication system corresponding to a plurality of communication methods, a gate switching center connected to another communication system, a location registration information storage device for storing location registration information of a terminal, A switching center that provides the terminal with the service area of the first communication scheme, a first switching center that provides the terminal with the first service area of the second communication scheme, and a first switching office different from the first switching center. And a second switching center that provides the terminal with a second service area of the second communication method, and the terminal that has performed final location registration with the second switching center communicates using the first communication method. And when the gate exchange receives a call to the terminal in the second communication method, via the gate exchange, the location registration information storage device, the first exchange, and the exchange Notify the terminal of receipt of the call and The terminal is located in the first service area, and the terminal relates to information related to a call necessary for receiving the call, information related to the terminal, and an area where the location was last registered, from the first service area. When the information is notified to the first switching center that has jurisdiction over the service area, the first switching center, based on the information on the call, the information on the terminal, and the information on the registered location area, The service area in which the terminal is registered is specified, and the information related to the call and the information related to the terminal are communicated (transferred) to the second switching center that has jurisdiction over the service area, and the first and second A call to the terminal is connected through the first base station using information on the call communicated between switching centers and information on the terminal. To.

  According to the present invention, when a 3G-CS call using the CS-Fallback function in the E-UTRAN area is received, the terminal responds to an exchange different from the exchange that sent the PAGING signal (position registration). Therefore, it is possible to provide a mobile communication system that can receive a call without causing a call loss.

  Furthermore, according to the present invention, when a 3G-CS call is being sent from a terminal while using E-UTRAN access, if a call request is issued from the terminal to a switching center different from the location-registered switching center, It is possible to provide a mobile communication system that can make a call without performing relocation registration.

  One embodiment of the present invention will be described with reference to FIGS. This embodiment will be described using a mobile communication system that provides UTRAN (W-CDMA) / E-UTRAN (LTE) services. In addition, since the structure and operation | movement of each element (GMSC, HLR, MME, etc.) single-piece | unit can be changed timely as long as the meaning of this invention is followed, detailed description is abbreviate | omitted. The MSC also includes a VLR (Visited Location Register) function. For this reason, messages such as MAP-PRN are messages that are originally processed by the VLR. However, in this manual, since the MSC includes the VLR function, the MSC directly processes the MAP-PRN message. It describes as.

  FIG. 5 is a schematic diagram illustrating a connection operation in a system configuration example of UTRAN (W-CDMA) / E-UTRAN (LTE). Each operation in FIG. 5 corresponds to each configuration and operation shown in FIG. 1, so detailed description of the common configuration and operation is omitted.

  Referring to FIG. 5, an exemplary UTRAN / E-UTRAN system configuration includes a GMSC 10 connected to another communication network, an HLR 11 that records and provides location registration information such as UE 30, and an MSC 1 that handles two UTRAN accesses. 12 and MSC2 14, an MME 13 that handles one E-UTRAN access, and a UE 30 that is a multimode terminal.

  The MSC1 12 and the MSC2 14 each have a NodeB, and manage the UTRAN LA1 and the UTRAN LA2.

  The MSC1 12 and the MSC2 14 have a function of receiving a CM service Request from a UE whose location is not registered via a subordinate NodeB. In addition, it has a function of generating an inter-station communication message (inter-node communication message), which will be described later, between the MSCs and enabling transmission / reception.

  The MME 13 has an eNodeB under its control and manages a TA (Tracking Area) for E-UTRAN.

  The UE 30 is a mobile terminal having a function corresponding to both UTRAN / E-UTRAN access systems. The UE 30 is registered with the MSC 1 12 on the UTRAN side and with the MME 13 on the E-UTRAN side. The UE 30 performs PS domain access via E-UTRAN and CS domain access via UTRAN.

  UE30 is provided with the function to transmit CM service Request to MSC which is not location-registered via NodeB. In addition, when the CM Service Request is transmitted, a function of transmitting the LAI with the last registered location is also provided.

  In such a configuration, the mobile communication system according to the embodiment, from the terminal to the MSC that is different from the MSC that has transmitted the PAGING signal (the location is registered) when the CS call arrives in the PS domain in the LA area. When there is a response, it is possible to provide a mobile communication system that can receive a call without causing a call loss.

  Next, an operation example at the time of an incoming call of the mobile communication system according to the embodiment of the present invention will be described.

  In the following description, a case will be described where a voice call from the CS domain is received while the UE 30 is making PS access to the network via the E-UTRAN at a predetermined time point. In addition, the operations of the NodeB and the eNodeB are described together with the operations of the MSC and the MME for the sake of clarity, and detailed description thereof is omitted.

  The GMSC 10 detects an incoming call of a voice call from the CS domain (step S1).

  The GMSC 10 transmits a MAP-SRI signal to the HLR 11 (step S2).

  Upon receiving the SRI signal, the HLR 11 detects the MSC in which the location of the call destination UE 30 is registered, and transmits a PRN signal, which is information related to the call, to the detected MSC 1 12 (step S3).

  The MSC1 12 receives various types of information (such as PRN) related to an incoming call, and detects that the UE 30 is using access on the E-UTRAN side. The MSC1 12 that has detected use of the E-UTRAN of the UE 30 transmits a request signal (Paging Request) so as to transmit a PAGING request due to the arrival of a CS (voice) call to the MME 13 (step S4).

 In response to the Paging Request, the MME 13 transmits a PAGING signal that is information related to the call to the UE 30 (step S5).

  Here, when the UE 30 switches the access system to UTRAN to receive the CS call and accesses the MSC via the UTRAN, it cannot access the UTRAN LA1 20 (MSC1 12) that last registered the location for some reason. Instead, the case where the UTRAN LA2 22 (MSC2 14) is accessible will be described.

  The UE 30 switches the access system to UTRAN to accept the CS call. The UE 30 transmits a CM Service Request message including LAI (Location Area Identity), which is information related to the location registered area of the UTRAN LA1 20 that has finally registered the location, to the MSC2 through the UTRAN LA2 22 (step S6). The CM Service Request includes TMSI (Temporary Mobile Subscriber Identity) that is information about the terminal. IMSI may be used.

  The MSC2 14 that has received the CM Service Request message pays out the MSRN for receiving the incoming call, determines the MSC1 12 that the incoming call has reached from the LAI and TMSI included in the message, and sends the interoffice communication message to the MSC1. 12 (step S7). This message includes the TMSI and the paid MSRN.

  Upon receiving the inter-station communication message, the MSC1 12 verifies from the TMSI that it is the TMSI of the UE 30 that is currently in call (Pre-Page) operation, and if there is no problem, the MSC1 12 responds to the MSC2 14 with a response message. At the same time, the minimum information (User-Profile etc.) necessary for processing the incoming call is transmitted (step S8). Note that the signal exchange between the MSC1 12 and the MSC2 14 by the inter-station communication message (request / response message) may be performed by communicating only the minimum information necessary for incoming call processing. May be included. Further, as the minimum information, information included in Insert Subscriber Data included in a MAP message transmitted by HLR at the time of location registration may be used, or information acquired by another method may be used.

  The MSC1 12 responds with the paid-out MSRN information to the PRN message from the HLR 11 (step S9).

  The HLR 11 transmits a response of the SRI message to the GMSC 10 together with the MSRN (Step S10).

  UE30 performs location registration (Location Update) procedure with respect to MSC2 (UTRAN LA2) simultaneously with transmission of a CM Service Request message, and performs location registration (steps S11 to 14). The location registration may be performed after the line connection.

  The GMSC 10 transmits an IAM message to the MSC 2 14 based on the MSRN received from the HLR 11 (step S15).

  The MSC2 14 confirms the arrival of the voice call and establishes a voice call between the caller and the UE 30 (step S16).

  In other words, the above steps S1 to S5 can be said to be steps in which the mobile communication system notifies the UE 30 of an incoming call to the UE 30. In other words, from step S6 to S8, it can be said to be a step of processing the response of the UE 30. Furthermore, in other words, steps S9 to S16 are steps for connecting a call.

  FIG. 6 is a communication sequence diagram at the time of an incoming call in the mobile communication system. Since each communication in FIG. 6 corresponds to each communication shown in FIG. 1, detailed description of common operations and the like is omitted.

1. To 5. This is the same as the method described with reference to FIG.

6). When the UE 30 transmits a CM Service Request that responds to the paging message received on the E-UTRAN access side, the UE 30 transmits the LAI that has been registered for the last time.

7. MSC2 14 which received CM Service Request confirms whether it is CM Service Request from UE30 which self made the call request from LAI and TMSI. If the confirmation result is a call for which a call request has been sent, the MSC2 14 performs the incoming process for the CS call as in FIG. If the confirmation result is not a call for which the call request has been sent, the MSC2 14 specifies the MSC1 12 that has made the call request from the LAI information registered at the last location included in the response message.

  The MSC2 14 selects and sets an MSRN (Mobile Station Roaming Number) for the UE 30 that can be routed to itself (located in the UTRAN LA2 that it manages).

  The MSC2 14 sends an inter-station communication message to the MSC1 12 together with the set MSRN and the TMSI of the UE 30.

8). The MSC 1 12 identifies the corresponding terminal from the TMSI included in the inter-station communication message, confirms the validity of the TMSI, confirms the transmission history of the PAGING signal, and the like.

  When the MSC1 12 determines that the incoming call should be accepted, the MSC1 12 transfers the minimum information necessary for processing the incoming call to the MSC2 14.

9. The MSC1 12 transmits a MSRN notified from the MSC2 14 (PRN response) as a response to the PRN message from the HLR 11.

10. When the HLR 11 receives the PRN response message including the MSRN from the MSC 1 12, the HLR 11 generates an SRI response message including the MSRN and transmits it to the GMSC 10.

11. -14. The UE 30 transmits a location registration request (Location Update message) to the MSC2 14 using the time until the incoming call from the MSC2 14 arrives, and performs location registration to the MSC2 14.

15. When the GMSC 10 receives the SRI response message including the MSRN from the HLR 11, the GMSC 10 transmits an IAM message that attempts to establish a CS call addressed to the MSRN. Note that since the MSRN is a number to which the CS call to be connected is routed to the MSC2 14, the IAM message reaches the MSC2 14.

16. The MSC2 14 receives the IAM message and establishes a connection between the incoming CS (voice) call and the UE 30.

  By operating as described above, a call can be processed normally even when the calling source and the response destination MSC are different.

  Next, an operation example of transmission (calling) of the mobile communication system will be described with reference to FIG.

  FIG. 7 is a schematic diagram illustrating a call operation in a system configuration example of UTRAN / E-UTRAN. In the following explanation, when a CS call is made by UTRAN using E-UTRAN access from UE 60 at a predetermined time, UE 60 can access MSC 3 42 without being able to access MSC 3 42 whose location has been registered. explain. Further, the operation of the NodeB is described together with the operation of the MSC for the sake of clarity, and detailed description thereof is omitted.

  When the user of the UE 60 makes a voice call while using the E-UTRAN access, the UE 60 switches the access system to 3G-CS access (UTRAN access) in the same way as when receiving a call.

  The UE 60 detects that the location registered MSC3 42 cannot be accessed and also detects that the MSC4 44 can be accessed when performing the outgoing call processing of the CS call.

  The UE 60 transmits a CM service request including the last registered LAI and TMSI to the MSC 444.

  Upon receiving the CM Service Request message, MSC4 44 determines MSC3 42 where the location of the UE 60 making the call is registered from the LAI included in the message, and transmits an inter-station communication message to MSC3 42. This message includes TMSI.

  When MSC3 42 receives the inter-station communication message, it verifies from the TMSI information that it is the TMSI of the UE 60 that is making the call, and if there is no problem, processes the call with the response message to MSC4 44. Send the minimum information (part of User-Profile, etc.) necessary for It should be noted that the exchange of signals between the MSC and the MSC by the inter-station communication message (request / response message) may be performed by communicating only the minimum information necessary for the call processing, but other information may be used as necessary. May be included. Further, the minimum information necessary for call processing may be specified by the requesting MSC. When the requesting MSC designates the requested information, it is not necessary to consider the difference in information necessary for outgoing calls for each roaming destination.

  The MSC4 44 acquires information necessary for making a call from the MSC3 42 and processes a call connection request from the UE 60.

  By operating as described above, when a CS call is transmitted from the UE 60 while using the PS domain, the UE 60 can access the MSC 3 42 without being able to access the registered MSC 3 42, and the relocation is performed. Calls can be made without registration. This operation is effective in shortening the call waiting time of the user.

  In the description of the mobile communication system according to the above embodiment, the LAI is used as the information related to the location registered area transmitted by the terminal. However, instead of the LAI, the TAI (Tracking Area Identity) or RAI (Routing Area) is used. Identity) may be used. In this case, the exchange that receives the message from the terminal uses the TAI or RAI to transmit / receive an inter-office communication message to / from the MME that manages the TA or the MSC that manages the RA, and the area where the terminal is registered ( It is sufficient to process the call together with the identification of the switching office.

  Further, in the description of the mobile communication system according to the above-described embodiment, it has been described that a message including information related to the registered area is transmitted from the terminal that has not been registered from the beginning to the switching center. When the station and the base station detect a terminal whose location is not registered, a message including information on the area may be transmitted to the terminal.

  Specifically, for example, the UE transmits a CM service request to the first MSC to be transmitted in the same manner as the existing method, and requests the LAI for location registration when the MSC cannot process the CM service Request to the UE, What is necessary is just to make it transmit again CM Service Request containing LAI which UE registered the position last in response to the request | requirement from MSC. In this way, it is possible to provide a mobile communication system that can flexibly handle even when existing MSCs and UEs coexist.

  As described above, according to the present invention, when a 3G-CS call is received using the CS-Fallback function in the E-UTRAN area, the switching center is different from the switching center that has transmitted the PAGING signal (the location is registered). When a response is received from the terminal, it is possible to provide a mobile communication system that can receive a call without dropping the call.

  Similarly, according to the present invention, when a 3G-CS call is being sent from a terminal while using an E-UTRAN access, when a call request is issued from the terminal to a switching center different from the location-registered switching center, It is possible to provide a mobile communication system that can make a call without performing relocation registration.

  It should be noted that the specific configuration and operation of the present invention are not limited to the above-described examples, and modifications within a range not departing from the gist of the present invention are included in the present invention.

It is a figure which illustrates a UTRAN (W-CDMA) / E-UTRAN (LTE) system configuration. It is a communication sequence diagram of a mobile communication system. It is a communication sequence diagram at the time of call loss of the mobile communication system. It is a figure which shows generation | occurrence | production of the call loss in the example UTRAN (W-CDMA) / E-UTRAN (LTE) system configuration. It is the schematic which shows the connection operation | movement in a UTRAN (W-CDMA) / E-UTRAN (LTE) system structural example. It is a communication sequence diagram at the time of an incoming call of the mobile communication system. It is the schematic which shows the calling operation | movement in a UTRAN / E-UTRAN system structural example.

Explanation of symbols

10 GMSC (Gateway MSC)
11 HLR (Home Location Register) (Location registration information storage device)
12 MSC1 (Mobile Switching Center1) (second exchange)
13 MME (Mobility Management Entity) (Exchange)
14 MSC2 (first exchange)
20 UTRAN LA1 (UMTS Terrestrial Radio Access Network Location Area 1) (first service area of the second communication method)
21 E-UTRAN TA (Evolved UMTS Terrestrial Radio Access Network Tracking Area) (service area of first communication method, communicable area)
22 UTRAN LA2 (second service area of the second communication method)
30 UE (User Equipment) (multi-user terminal, terminal)
42 MSC3 (Mobile Switching Center3)
43 MME
44 MSC4
50 UTRAN LA3
51 E-UTRAN TA
52 UTRAN LA4
60 UE

Claims (16)

A call connection method used in a mobile communication system corresponding to a plurality of communication methods,
When a call is made to the terminal in the second communication method while the terminal is communicating using the first communication method, the occurrence of the call is notified to the terminal through the first communication method. And steps to
Necessary for receiving the call from the area of the second communication method in which the terminal is not performing location registration and the terminal is not performing location registration. The first switching center is informed about the call and the information regarding the terminal. Based on the information and the information on the registered area, the area in which the terminal is registered is specified, and the information on the call and the information on the terminal are communicated with the second switching center having jurisdiction over the area. (Forward) and process the response;
Connecting the call in the second communication mode to the terminal through the first base station using the information about the call communicated between the first and second exchanges and the information about the terminal. A call connection method comprising: A call connection method used in a mobile communication system corresponding to a plurality of communication methods,
When the terminal ends communication by the first communication method and makes a call (line connection) request by the second communication method, the terminal is in the area of the second communication method in which location registration is not performed Then, when the area notifies the first switching center having jurisdiction over the area information about the call that is necessary for the call, information about the terminal, and information about the registered area. The switching center specifies the area where the terminal is registered based on the information about the call, the information about the terminal, and the information about the area registered, and the second switching center that has jurisdiction over the area Communicating (forwarding) information about the call and information about the terminal;
Processing a call (line connection) request from the terminal through the first base station using information about the call and information about the terminal communicated between the first and second exchanges; and A call connection method comprising: The call connection method according to claim 1 or 2, wherein
The first communication method belongs to a PS (Packet Switched) domain,
The second communication method belongs to a CS (Circuit Switched) domain,
Information on the call uses either Paging, MSRN, PRN or a combination thereof,
Information on the terminal uses either TMSI, IMSI or a combination thereof,
The call connection method characterized in that any one of LAI, TAI, RAI, or a combination thereof is used as the information related to the location-registered area. A call connection method according to any one of claims 1 to 3,
The first communication method is E-UTRAN,
The call connection method, wherein the second communication method is UTRAN. A call connection method used in a mobile communication system corresponding to a UTRAN access system and an E-UTRAN access system,
When a multi-mode terminal receives a call connection request to the multi-mode terminal using the UTRAN access system during communication using the E-UTRAN access system, the call of the call is transmitted via the E-UTRAN access system. Notifying the multi-mode terminal of a connection request using a Paging signal;
Within the communicable area that is outside the communicable area of the communicable area under the jurisdiction of the switching center where the multimode terminal last registered the location, and within the communicable area managed by another switching center different from the switching center In some cases, the multi-mode terminal identifies the other switching center, and transmits a CM Service Request and information related to the registered location to the other switching center;
When the other switching center receives information about the area registered with the CM Service Request from the multimode terminal, the other switching center based on the information about the area registered with the CM Service Request, The multi-mode terminal identifies the switching center that last registered the location, assigns an MSRN corresponding to the CM Service Request, and transmits an inter-station communication message including TMSI and MSRN to the identified base station. And steps to
When the inter-station communication message is received, the base station identifies an incoming call to the multi-mode terminal based on the received TMSI information, and processes the incoming call to the other base station. Sending an inter-station communication message containing the necessary information;
The base station transmitting a PRN response including the MSRN assigned by the another base station. The call connection method according to claim 5, wherein
The multi-mode terminal transmits a location registration request to another switching center after transmitting a CM Service Request and information related to the registered location to the other switching center. Connection method. A mobile communication system supporting a plurality of communication methods,
A gate exchange connected to other communication systems;
A location registration information storage device for storing location registration information of the terminal;
An exchange that provides the terminal with a service area of the first communication method;
A first exchange providing a terminal with a first service area of a second communication method;
A second switching center that provides the terminal with a second service area of a second communication scheme different from the first switching center;
When the terminal that performed the last location registration with the second switching center is communicating using the first communication scheme and the gate switching center receives a call to the terminal in the second communication scheme, Via the gate exchange, the location registration information storage device, the first exchange, and the exchange to notify the terminal of the reception of the call;
Area where the terminal is located in the first service area, and the terminal is registered from the first service area with information about a call necessary for receiving the call, information about the terminal, and last location registration Information to the first switching office having jurisdiction over the service area,
The first switching center specifies a service area in which the terminal is registered based on information on the call, information on the terminal, and information on the registered area, and has jurisdiction over the service area Communicate (transfer) information about the call and information about the terminal with the second exchange,
A mobile communication system characterized in that a call to the terminal is connected through the first base station by using information on the call and information on the terminal communicated between the first and second exchanges. . A mobile communication system supporting a plurality of communication methods,
A gate exchange connected to other communication systems;
A location registration information storage device for storing location registration information of the terminal;
An exchange that provides the terminal with a service area of the first communication method;
A first exchange providing a terminal with a first service area of a second communication method;
A second switching center that provides the terminal with a second service area of a second communication scheme different from the first switching center;
The terminal that has performed the last location registration with the second switching center terminates communication by the first communication method and makes a call (line) to the switching center that has performed the last location registration by the second communication method. Connection) when requesting
Area where the terminal is located in the first service area, and the terminal is registered from the first service area with information about a call necessary for receiving the call, information about the terminal, and last location registration Information to the first switching office having jurisdiction over the service area,
The first switching center specifies a service area in which the terminal is registered based on the information on the call, the information on the terminal, and the information on the registered area, and has jurisdiction over the service area Communicate (transfer) information about the call and information about the terminal with the second exchange,
Processing a call (line connection) request from the terminal through the first base station, using information on the call and information on the terminal communicated between the first and second exchanges; A mobile communication system. The mobile communication system according to claim 7 or 8,
The first communication method belongs to a PS (Packet Switched) domain,
The second communication method belongs to a CS (Circuit Switched) domain,
Information on the call uses either Paging, MSRN, PRN or a combination thereof,
Information on the terminal uses either TMSI, IMSI or a combination thereof,
The mobile communication system characterized in that any one of LAI, TAI, and RAI, or a combination thereof is used as the information related to the registered area. A mobile communication system according to any one of claims 7 to 9,
The first communication method is E-UTRAN,
The mobile communication system, wherein the second communication method is UTRAN.   A switching center used in the mobile communication system according to any one of claims 7 to 10.   A terminal used in the mobile communication system according to any one of claims 7 to 10. A mobile communication system corresponding to a UTRAN access system and an E-UTRAN access system,
A gate exchange connected to other communication systems;
A location registration information storage device for storing location registration information of the multimode terminal;
An exchange providing the service area of the E-UTRAN access system to a multimode terminal;
A first switching center that provides a multi-mode terminal with a first service area of a UTRAN access system;
A second switching center for providing a multi-mode terminal with a second service area of a UTRAN access system different from the first switching center;
When a multi-mode terminal that has performed the last location registration with the second switching center receives a call connection request to the multi-mode terminal that uses the UTRAN access system during communication using the E-UTRAN access system. , Via the E-UTRAN access system, to notify the connection request for the call to the multi-mode terminal using a Paging signal,
The multimode terminal is outside the communicable area of the service area under the jurisdiction of the second switching center where the multi-mode terminal last registered, and is within the communicable area within the service area managed by the first switching center The multi-mode terminal identifies the first switching center and transmits information about the area registered as the location of the CM Service Request to the first switching center,
When the first switching center receives information on the area registered with the CM Service Request from the multi-mode terminal, the first switching center includes information on the area registered with the CM Service Request. Based on the second switching center where the multi-mode terminal has last registered the location, and assigns an MSRN corresponding to the CM Service Request, to the identified second switching center. Send inter-station communication messages including TMSI and MSRN,
When the inter-office communication message is received, the second switching center identifies an incoming call to the multimode terminal based on the received TMSI information, and the incoming call is sent to the first switching center. Send an interoffice communication message containing the information needed to process the call;
The mobile communication system, wherein the second switching center transmits a PRN response including an MSRN assigned by the first switching center. A mobile communication system according to claim 13,
The multi-mode terminal transmits a location registration request to the first switching center after transmitting a CM Service Request and information related to the registered location to the first switching center. Mobile communication system.   The exchange used in the mobile communication system according to claim 13 or 14.   A multimode terminal used in the mobile communication system according to claim 13 or 14.

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