CN101047900B - Recovery method of terminal called service, mobile exchange center and system - Google Patents

Abstract

The present invention relates to a method and system for restoring terminal called services, the method comprising: a backup mobile switching center obtains current location area information of a terminal belonging to the failed mobile switching center, and initiates paging for the terminal in the current location area message; the mobile switching center that receives the paging response message sends a request message to redistribute the TMSI; the terminal registers to any valid mobile switching center in the mobile switching center pool where the invalid mobile switching center is located according to the request message to redistribute the TMSI. The invention also provides a communication system and a mobile switching center. The invention can effectively solve the technical defects of the prior art, such as needing to upgrade network equipment, reducing equipment service processing capability, wireless channel congestion caused by whole network paging, and the like.

Description

Method for recovering terminal called service, mobile switching center and system

technical field

The invention relates to mobile communication technology in the field of communication, in particular to a method for restoring a terminal called service, a mobile switching center and a system.

Background technique

The IU FLEX (Intra-domain connection of RAN nodes to multiple CN nodes) technology is described in the 3rd Generation Partnership Project (3rd Generation Partnership Project, referred to as 3GPP) technical specification (technology standard, referred to as TS), that is, 3GPP TS23.236 The purpose of this technology is to realize a networking mode in which one Radio Access Network (RAN) node can be connected to multiple core network (CN) nodes in the same domain.

As shown in Figure 1, the core network node is a mobile switching center (MSC for short), and the mobile switching pool includes several MSCs. If a certain MSC in the mobile switching center pool (MSC POOL), such as MSC1, fails , the user data in MSC1 will be lost, and when the called request of a user registered on MSC1 takes place, the user's home location register (Home Location Register, referred to as HLR) fails to obtain the roaming number from the mobile switching center MSC1, and the user's The called party cannot be connected unless the user initiates a location update or makes a calling call before the user's called party can be connected. Therefore, during the failure of a certain mobile switching center, the called service of the user can only be received after the user who is registered in the mobile switching center actively updates the location or makes a call, and re-registers to other mobile switching centers in the mobile switching pool. Otherwise, the called service of the user is always in the call failure state.

Chinese patent application number 200510118251.0 discloses a method and system for preventing mobile termination call failures. In the disclosed technical solution, the MSC POOL is configured in the database of the home location register or signal transfer points (STP). When a certain MSC fails, the network equipment (HLR or STP) selects a replacement MSC from the corresponding MSC POOL, and uses the same or similar algorithm of the radio network controller (RNC) to select. Although the disclosed technical solution can solve the problem that the user's called fails when a mobile switching center in the mobile switching center pool fails, it has the following defects:

1. When the network equipment registered by the user supports the above functions, the network equipment can choose an alternative mobile switching center, and the user's called service can be restored; however, for the entire operating network, not all network equipment registered by the user can support For the above functions, in this case, not all called services in the entire operation network can be recovered by using the above method. Therefore, if the above problems are to be completely solved, all HLRs, STPs, etc. of the entire network need to be upgraded. Network equipment, this cost is too high;

2. The disclosed technical solution requires network equipment to implement a selection algorithm, which will increase the amount of configuration data of the network equipment (HLR or STP), affect the equipment's own business processing capabilities, and reduce the equipment's own business processing capabilities;

3. The mobile switching center selected by the network equipment does not save the user's current location area information. Therefore, the paging user needs to send the user's International Mobile Subscriber Identification Number (IMSI) to the coverage area of the MSC Pool. Paging for the paging logo, that is, global paging (Global Paging); once the global paging is performed, the wireless channel will be congested, making it impossible for other users to use the wireless channel normally;

4. When the third generation mobile communication network (3nd Generation, referred to as 3G) user responds to the request from the Iu interface, that is, the interface between the radio network controller (Radio network control, referred to as RNC) and the core network (core network, referred to as CN) When calling (refer to 3GPP TS23.236sec4.4), the user identifier of the paging message is "IMSI", but the user identifier of the paging response message is Temporary Mobile Subscriber Identity (TMSI). When the RNC receives the paging response identified by "TMSI", it cannot know which mobile switching center initiated the paging message, so the paging response message may be returned to any available MSC in the MSC POOL through the RNC , this MSC may not be the MSC selected by the network equipment (HLR or STP); therefore, for 3G users, the called service may still be unavailable.

Contents of the invention

The purpose of the present invention is to provide a method and system for recovering terminal called services, which can effectively solve the technical defects of the prior art such as the need to upgrade network equipment, the reduction of equipment service processing capabilities, and the congestion of wireless channels caused by network-wide paging.

In order to achieve the above object, the present invention provides a method for restoring a terminal called service, including:

Step 1, the standby mobile switching center obtains the current location area information of the terminal belonging to the invalid mobile switching center, and initiates a paging message to the terminal in the current location area;

Step 2, the mobile switching center that receives paging response message sends the request message that redistributes TMSI;

Step 3. According to the request message, the terminal registers with any active MSC in the MSC pool where the invalid MSC is located.

Wherein said step 1 can be:

The home location register forwards the PRN request message to the standby mobile switching center of the failure mobile switching center through the signaling transfer point;

The backup mobile switching center obtains the current location area information of the terminal from its backup data;

The standby mobile switching center initiates a paging message to the current location area of the terminal.

Step 1 can also be:

The standby mobile switching center obtains the terminal's current location area information and IMSI information from its backup data after obtaining the failure information of the failed mobile switching center;

The standby mobile switching center automatically initiates a paging message identified by the IMSI to the current location area of the terminal.

In order to achieve the above object, the present invention also proposes a communication system, including:

Network equipment, used to save the information of the mobile switching center pool and its mobile switching center and terminals;

The mobile switching center pool includes a plurality of mobile switching centers; the mobile switching center is connected to the network equipment, and is used for initiating a paging message to the terminal current location area of the invalid mobile switching center; sending a paging response message to a non-locally registered terminal Re-allocate the TMSI request message, and re-register the terminal to any valid mobile switching center in the mobile switching center pool;

The terminals and location area information of one or more other MSCs in each MSC backup pool in the MSC pool are used as backup MSCs of the one or more other MSCs.

To achieve the above object, the present invention also provides a mobile switching center, comprising:

A storage module, configured to store location area information of non-locally registered terminals of one or more other mobile switching centers;

The response module is connected with the storage module, and is used for initiating a paging message to the current location area of the terminal after receiving the terminal called information forwarded by a mobile switching center in the one or more other mobile switching centers after failure, and receiving After receiving the paging response message of the non-locally registered terminal, send the request message of reallocating TMSI.

The present invention also provides another mobile switching center, including:

A storage module, configured to store location area information of non-locally registered terminals of one or more other mobile switching centers and valid states of the one or more other mobile switching centers;

The response module, connected with the storage module, is used to automatically initiate a paging message to the current location area of the terminal of the failed mobile switching center when detecting that one or more mobile switching centers of the one or more other mobile switching centers fail, and receive After receiving the paging response message of the non-locally registered terminal, send the request message of reallocating TMSI.

In the present invention, when a certain mobile switching center fails, the standby mobile switching center of the failed mobile switching center can initiate paging to the terminal of a non-registered user and establish a wireless connection to the terminal through the received paging response message, and initiate redistribution of TMSI request message, migrate the users of the faulty mobile switching center, and register the terminal to other mobile switching centers in the mobile switching center pool, so as to restore the called service of the terminal and effectively solve the called problem of the terminal of the faulty mobile switching center . The present invention can select the standby mobile switching center designated by the standby route, and the standby mobile switching center backs up the current location area information of the terminal belonging to the invalid mobile switching center, without upgrading the network equipment of the whole network (such as: signaling transfer support main and standby routes respectively to mobile switching centers or standby mobile switching centers); each mobile switching center is configured with a standby mobile switching center, which does not require network equipment (HLR or STP) to implement selection algorithms, and does not affect equipment service processing capabilities; The standby mobile switching center backs up the current location area information of the terminal, which is only performed in a specific location during paging to avoid wireless channel congestion caused by paging across the entire network, and the dynamic data only backs up the basic location information of the terminal, and the backup data is small. Easy to implement.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

FIG. 1 is a schematic diagram of an existing networking structure;

Fig. 2 is a flow chart of Embodiment 1 of the recovery method of the terminal called service of the present invention;

Fig. 3 is a flowchart of embodiment 1 of step 1 in Fig. 2;

FIG. 4 is a schematic diagram of the analysis of Embodiment 2 of the method for restoring the called service of the terminal according to the present invention;

FIG. 5 is a schematic diagram of the analysis of Embodiment 3 of the method for restoring the called service of the terminal according to the present invention;

Fig. 6 is the flow chart of embodiment 2 of step 1 in Fig. 2;

FIG. 7 is a schematic diagram of an analysis of Embodiment 4 of a method for restoring a called service of a terminal according to the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 1 of the communication system of the present invention;

FIG. 9 is a schematic structural diagram of Embodiment 2 of the communication system of the present invention;

FIG. 10 is a schematic structural diagram of Embodiment 3 of the communication system of the present invention;

Fig. 11 is a structural schematic diagram of implementing a mobile switching center of the present invention;

FIG. 12 is a schematic structural diagram of Embodiment 2 of the mobile switching center of the present invention;

FIG. 13 is a schematic structural diagram of Embodiment 3 of the mobile switching center of the present invention;

Fig. 14 is a schematic structural diagram of Embodiment 4 of the mobile switching center of the present invention.

Detailed ways

FIG. 2 is a flow chart of Embodiment 1 of the method for restoring the called service of the terminal according to the present invention. As shown in Figure 2, this embodiment includes the following steps:

Step 1, the standby mobile switching center obtains the current location area information of the terminal belonging to the invalid mobile switching center, and initiates a paging message to the terminal in the current location area;

Step 2, the mobile station of the terminal feeds back a paging response message after receiving the paging;

Step 3, the mobile switching center that receives described paging response message sends the request message of reallocating TMSI;

Step 4, the mobile station sends a location update request after receiving the request message, and registers the terminal with any valid mobile switching center in the mobile switching center pool;

Step 5. The mobile switching center that registers the terminal updates the home location register of the terminal, and obtains the user data of the terminal from the home location register.

In the present invention, when a certain mobile switching center fails, the standby mobile switching center of the failed mobile switching center can establish a wireless connection to the terminal by initiating paging to the terminal of a non-registered user and receiving a paging response message, and after the connection is established Initiate a request message to reassign TMSI, migrate the users of the faulty mobile switching center, and register the terminal to other valid mobile switching centers in the mobile switching center pool, so as to restore the called service of the terminal and effectively solve the problem of the faulty mobile switching center The called problem of the terminal. The present invention can select the standby mobile switching center designated by the standby route, and the standby mobile switching center backs up the current location area information of the terminal belonging to the invalid mobile switching center, without upgrading the network equipment of the whole network (such as: signaling transfer support main and standby routes respectively to mobile switching centers or standby mobile switching centers); each mobile switching center is configured with a standby mobile switching center, which does not require network equipment (HLR or STP) to implement selection algorithms, and does not affect equipment service processing capabilities; The standby mobile switching center backs up the current location area information of the terminal, which is only performed in a specific location during paging to avoid wireless channel congestion caused by paging across the entire network, and the dynamic data only backs up the basic location information of the terminal, and the backup data is small. Easy to implement.

The present invention can have a variety of specific implementations in different forms. Below, different network devices: home location registers and signaling transfer points are used as examples to illustrate the technical solutions of the present invention in conjunction with the accompanying drawings. This does not mean that the present invention The specific examples applied can only be limited to specific network equipment. Those of ordinary skill in the art should understand that the specific implementation solutions provided below are just some examples of multiple preferred usages. Any mobile switching center can back up other one or more The current location area information of the terminal in the mobile switching center, and initiating paging to the terminal in the current location area to establish a wireless connection from the mobile switching center to the terminal or to send a request message for reassigning a TMSI to a non-locally registered terminal should all be included in the technical solution of the present invention. within the scope of the claimed protection.

In order to avoid failure of a certain MSC in the mobile switching center pool (abbreviated as MSC pool), causing the called terminal to fail, when it is known that a certain MSC is invalid, select the standby mobile switching center of the MSC to replace the failed MSC, and the invalid MSC will be replaced. Migrate the user terminals on the network, and register the terminals to other effective MSCs in the mobile switching center pool, so as to normally handle the called services of the terminals. Those of ordinary skill in the art should understand that a mobile switching center may be designated by the active route, or may be a backup mobile switching center designated by the backup route of another mobile switching center, for example: the backup route of MSC1 Designate MSC2 and MSC3 as their backup MSCs, and MSC2 and MSC4 are designated as their backup MSCs for the backup routes of MSC2, then MSC2 is the MSC designated as the master route, and also the backup MSC of MSC1, and so on . Therefore, the mobile switching center or standby mobile switching center mentioned below does not refer to two different completely independent mobile switching centers, but refers to the mobile switching center that takes it as the main route in a specific operation process Or the mobile switching center specified by the alternate route, sometimes it may refer to the same mobile switching center.

The following will be described in detail in conjunction with accompanying drawings 3-7: when it is known that a certain MSC has failed, the standby MSC of the failed MSC will transfer the terminal of the failed MSC to any other valid MSC, so as to normally process the called service of the terminal and make the failure The terminal called service of the MSC is restored.

Fig. 3 is a flow chart of the first embodiment of step 1 in Fig. 2 . As shown in Figure 3, step 1 of this embodiment includes:

Step 11, the home location register HLR will provide roaming number (Provide Roaming Number, be called for short PRN) request and forward to the standby mobile switching center of failure mobile switching center through signaling transfer point STP;

Step 12, the standby mobile switching center obtains the current location area information of the terminal from its backup data;

Step 13, the standby mobile switching center initiates a paging message to the current location area of the terminal.

Step 1 of this embodiment is mainly to forward the called request of the terminal to the standby mobile switching center when the network device (HLR or STP) obtains that the home mobile switching center of the terminal fails or fails when the terminal has a called request. The mobile switching center initiates a paging message to the terminal.

FIG. 4 is a schematic analysis diagram of Embodiment 2 of the method for restoring the called service of the terminal according to the present invention. As shown in Figure 4, the signaling from HLR to MSC is transferred through STP. When STP configures the standby route of each MSC in the mobile switching center pool (MSC POOL), when a certain MSC fails, the STP forwards the signaling to the MSC specified by the standby route; at the same time, the MSC specified by the standby route needs to be backed up Subscriber identity (IMSI) and location area information (LAI) of the MSC specified by the primary route.

If the current home MSC of the terminal is MSC1, the backup route configured by the STP to MSC1 points to MSC2, that is, MSC2 is the backup mobile switching center of MSC1. As shown in Figure 4, when MSC1 fails, the called request of a certain terminal is processed as follows:

1. For convenience of description, it is assumed that MSC and Visit Location Register (VLR) are integrated and the MSC number is the same as its associated VLR number. As shown in Figure 4, the HLR obtains the current attribution of the terminal from the user database The mobile switching center is MSC1 or VLR1, and the HLR sends a Provide Roaming Number request (PRN for short) message to MSC1 through STP - "PRN MSC1" to obtain the roaming number of the terminal;

2. STP finds that MSC1/VLR1 has failed; then STP forwards the PRN request message to MSC2 through the backup route, that is, sends the PRN request message to MSC2—"PRN MSC2", as shown in Figure 4;

3. MSC2/VLR2 determines that the terminal is a non-local registered user of MSC2/VLR2, and replies to HLR with a message of failure to provide a roaming number—"PRN Ack" or does not respond to HLR's PRN request;

4. MSC2/VLR2 responds to the HLR with a PRN failure message or does not respond to the HLR's PRN request at the same time or later initiates a paging message to the current location area (LAI) of the terminal U - "Paging", and the terminal's LAI information is exchanged from the standby mobile Obtained from the backup data of center MSC2;

5. After the mobile station (MS) of the terminal U receives the paging message, the base station controller (BSC) returns to MSC2 a paging response message with the IMSI as the user identifier—"Paging Response "; In the present embodiment, the mobile station is the mobile station MS of the second generation mobile communication network (2nd Generation, referred to as 2G);

6. Through the IMSI user ID, MSC2 obtains that the terminal that initiates the paging response message is a non-local registered user of MSC2, then MSC2 initiates a request message for reallocating TMSI - "TMSIReallocation"; the request message for reallocating TMSI includes no network Resource identification (NullNetwork Resource Identity, referred to as Null-NRI) temporary mobile user identification code, and assign non-broadcast location area information (Non-Broadcast LAI) to the mobile station MS;

7. After the terminal receives the message containing Non-Broadcast LAI, because it is different from the stored current location area (LAI), it immediately initiates a location update request message - "Location Update";

8. The terminal registers to any available MSC in the MSC POOL through the location update request message, such as MSC3, and at the same time updates the HLR to register the terminal U to MSC3, as shown in Figure 4, the HLR inserts subscriber data—"Insert Subscriber Data " to MSC3.

After the terminal is successfully registered to MSC3 and the HLR is updated, subsequent called requests to the terminal can be normally established through the registered mobile switching center MSC3. The above-mentioned Null-NRI is a special network resource identifier, which is used to instruct the non-access layer node selection function network element to select a new available network element for the terminal mobile station MS in accordance with the principle of load balancing during the load migration process in the MSC Pool. The MSC server, the non-broadcast location area information is a special location area information, which does not need to be broadcast in the system information broadcast message, and is used to trigger the terminal to re-initiate location update in the process of load migration in the MSC Pool. In the prior art, if the MSC receives a location update message from a mobile station, and the MSC finds that the user terminal is a user roaming from another MSC, it allocates a TMSI to the mobile station of the terminal, and then initiates a request to re-allocate the TMSI message to the mobile station. In the prior art, after receiving the location update message of the non-locally registered terminal, a request message for reassigning the TMSI is initiated, and the request message for reassigning the TMSI in the prior art includes the newly allocated TMSI and the information brought by the location update message of the mobile station. Current location area LAI information. In the prior art, when an operation and maintenance instruction is received to request MSC load migration, reassignment is initiated, and the request message for reassignment TMSI includes TMSI in the NULL-NRI field and non-broadcast location area information, and the non-broadcast location area information can be used to trigger The terminal re-initiates the feature of location update, which enables the terminal to re-register with other valid MSCs. In the present invention, the MSC initiates load migration to re-register the terminal to other effective MSCs after receiving the paging response message from the non-locally registered terminal, which is substantially different from the prior art.

In the embodiment shown in Figure 4, when the MS responds to paging from the A interface (refer to 3GPP TS23.236) between the base station controller (BSC) and the core network (CN), if the user identifier in the paging message is IMSI , the user identifier of the paging response message is also IMSI. After the BSC receives the paging request with the IMSI as the user identifier, it stores the correspondence between the IMSI and the MSC2 that initiated the paging message. Therefore, according to the correspondence between the stored IMSI and the MSC that sent the paging request, the paging response message will be returned by the BSC. to MSC2.

FIG. 5 is a schematic analysis diagram of Embodiment 3 of the method for restoring the called service of the terminal according to the present invention. Fig. 5 is similar to Fig. 4, and the difference is that in this embodiment, the mobile station is a mobile station (User equipment, referred to as UE) of the third generation mobile communication network (3ndGeneration, referred to as 3G), and the 3G mobile station UE receives the IMSI as a sign After the paging message, if the terminal still saves the TMSI, it will feed back a paging response message with the TMSI as the identifier; if the 2G mobile station MS receives the paging message with the IMSI as the identifier, it will feed back the paging response message with the IMSI as the identifier. The paging response message returned by the 2G mobile station MS returns to the MSC that sent the paging message through the BSC and A interface. The 3G mobile station UE returns the paging response message through the Iu interface (refer to 3GPP TS23.236 sec4.4) between the radio network controller (Radio network controller, RNC) and the core network to respond to paging, such as the paging message The user ID is IMSI, but the user ID of the feedback paging response message is TMSI. When RNC receives the paging response identified by TMSI, it cannot know the corresponding relationship between the paging response message identified by TMSI and the MSC2 that initiated the paging message, so the paging response message may be returned to any MSC POOL by RNC An available MSC, such as MSC3 in Figure 5. Change step 5 in the embodiment of FIG. 4 into: after the terminal receives the paging message, the RNC returns a paging response message—"Paging Response"-"Paging Response" with TMSI as the user identifier to an effective mobile switching center MSC3. Subsequent steps are completed by replacing MSC2 with MSC3, and the rest are similar and will not be described in detail here. The specific analysis process is shown in Figure 5. Those of ordinary skill in the art should understand that the A interface and the Iu interface are common knowledge in the art. The A interface described herein is the interface between the base station controller (BSC) and the core network (CN), and the Iu interface is the wireless interface. Interface between network controller (RNC) and core network.

Fig. 6 is a flow chart of the second embodiment of step 1 in Fig. 2 . As shown in Figure 6, this embodiment includes:

Step 11', obtaining mobile switching center failure information;

Step 12', the standby mobile switching center of the failure mobile switching center obtains the current location area LAI information of the terminal and the user identifier IMSI of the terminal from its backup data;

Step 13', the standby mobile switching center automatically initiates a paging message of the IMSI identifier to the current location area of the terminal.

In this embodiment, after the standby MSC (MSC2 in Figure 7) finds that the active MSC (MSC1 in Figure 7) fails, it automatically transfers the terminals belonging to the active MSC, and automatically initiates paging to the current location area of the terminal. Register the terminal on the failed MSC to other valid MSCs in the mobile switching center pool. Different from the embodiment shown in FIG. 3, the embodiment shown in FIG. 3 transfers the failed mobile switching center to its backup mobile switching center through the signaling transfer point when the terminal has a called request, and completes subsequent call processing and communication Re-registration of the terminal; this embodiment simplifies the routing setting of the signaling transfer point, and automatically transfers and registers the user terminal of the invalid mobile switching center to other effective mobile switching centers in the mobile switching center pool after obtaining a certain mobile switching center failure Above all, after the registration transfer is completed, the called service of the terminal can be restored, which has the beneficial effect of faster recovery of the called service of the terminal.

The ways for the backup mobile switching center to learn that the mobile switching center fails include: manual setting, automatic sensing of the data synchronization link between the backup MSC and the main MSC, or a semi-automatic way, wherein:

1) The manual setting method means that when a certain MSC is found to be invalid, the MSC is manually set to the invalid state on the HLR or STP, and triggers the transfer of the terminal belonging to the invalid MSC;

2) The automatic sensing method means that through the data synchronization link of the mobile switching center, when the standby MSC finds that the active MSC does not respond correctly, it automatically sets the active MSC to the invalid state, and triggers the transfer of the terminal belonging to the invalid MSC;

3) The semi-automatic method means that when the standby MSC finds that the active MSC does not respond correctly, it generates an alarm, manually determines and sets the MSC to the failure state, and triggers the transfer of the terminal belonging to the failure MSC.

FIG. 7 is a schematic analysis diagram of Embodiment 4 of the method for restoring the called service of the terminal according to the present invention. The recovery process of the called service of the terminal is illustrated below in conjunction with FIG. 7:

Assuming that the current home MSC of the terminal is MSC1, MSC2 serves as the backup mobile switching center of MSC1, and MSC2 backs up the IMSI and location area information of the user on MSC1. When MSC1 fails, the process of registering the terminal to other effective MSCs is as follows:

1) Detecting a failure of MSC1 (manual, automatic sensing or semi-automatic mode), the standby mobile switching center MSC2 of MSC1 uses the IMSI as the user identifier to initiate a paging message - "Paging" to the current location area of the terminal, and the current location area of the terminal starts from Obtained from the backup data of MSC2;

2) After the mobile station MS receives the paging message, the base station controller (BSC) returns to MSC2 a paging response message with the IMSI as the user identifier——"Paging Response";

3) MSC2 obtains that the terminal that initiates the paging response message is a non-local registered user of MSC2, then MSC2 initiates a request message for reallocating TMSI—"TMSI Reallocation"; the request message includes no network resource identifier (Null- NRI) temporary mobile subscriber identity code, and assign non-broadcast location area information (Non-Broadcast LAI) to the mobile station MS;

4) After the mobile station MS receives the message containing Non-Broadcast LAI, because it is different from the stored current location area (LAI), it immediately initiates a location update request - "Location Update";

5) The terminal registers to any available MSC in the MSC POOL through a location update request, such as MSC3, and at the same time updates the HLR to register the terminal to MSC3, as shown in Figure 7, the HLR inserts user data—"Insert Subscriber Data" into MSC3.

After the terminal is successfully registered to MSC3 and the HLR is updated, subsequent called requests can be normally established through the registered mobile switching center MSC3.

The embodiment in Fig. 6 and Fig. 7 initiates paging to all terminals on the failed MSC, prompts all terminals on the failed MSC to initiate location update, and then transfers to other available MSCs. However, if some terminals have initiated calling or location updating, and have registered to other available MSCs, and all terminals are forced to initiate a transfer process, the user terminals that have been transferred through calling or location updating on the invalid MSC need to be transferred again. Transferring, repeating the follow-up process, will also increase the network load. The embodiment in Fig. 3 to Fig. 5 triggers the technical solution of transferring the terminal through the PRN message, which can avoid the above unnecessary repeated transfer operation, that is, only initiate the transfer process for the terminal that has no calling or location update. The technical scheme of automatically transferring the terminal is different from the embodiments of Fig. 3-Fig. 5, and can be specifically applied to the following situation: after the operator finds that a certain MSC is invalid, the VIP user on the invalid MSC (not all VIP users on the invalid MSC) user) initiates a forced transfer process to restore the called service of the important user on the invalid MSC earlier.

In the embodiment shown in Figure 7, when the MS responds to paging through the A interface, after the BSC receives the paging request with the IMSI as the user identifier, the paging response message will be returned to MSC2 through the BSC; the same reason as in Figure 5, when When the terminal UE responds to paging through the Iu interface, the paging response message may be returned to any available MSC in the MSC POOL through the RNC, such as MSC3 in Figure 7, and the subsequent steps will be completed by replacing MSC2 with MSC3, and the rest are similar, here No more details.

In addition, when the backup mobile switching center does not support the backup of terminal location area information of the invalid mobile switching center, the user terminal of the failed mobile switching center can be re-registered to any area by paging all areas covered by the MSC POOL and the subsequent TMSI reassignment process. On an active mobile switching center, the called service of the terminal is resumed.

FIG. 8 is a schematic structural diagram of Embodiment 1 of the communication system of the present invention. As shown in Figure 8, this embodiment includes:

The mobile switching center pool includes mobile switching centers 21, 22, and 23, and each mobile switching center is connected to the network device 1, and is used to initiate a paging message to the terminal current location area of the invalid mobile switching center; The paging response message sends a request message to redistribute the Temporary Mobile Subscriber Identity (TMSI) to re-register the terminal on any valid MSC in the MSC pool, and the MSC 21, 22 or 23 can back up the pool The terminal and the location area information of other mobile switching centers will be used as the standby mobile switching center (such as mobile switching center 22 and/or mobile switching center 23 backup mobile switching center 21 and the location area information thereof of other mobile switching centers) as The standby mobile switching center of mobile switching center 21);

The network device 1 is connected to the mobile switching centers 21, 22, and 23 respectively, and is used to save the information of the mobile switching center pool and its mobile switching centers 21, 22, 23 and terminals. When it is known that the mobile switching center where the terminal is currently located fails, Selecting the standby mobile switching center of the failed mobile switching center for subsequent call processing.

The network device may be a home location register (HLR), applicable to local network users; the network device may also be a signaling transfer point (STP), applicable to non-local network users and roaming users. The network equipment should support the function from the mobile switching center to the standby mobile switching center, that is, when a certain mobile switching center fails or fails, the network equipment can select the standby mobile switching center to complete the re-registration process. When the network device is a signaling transfer point, the signaling transfer point configures the standby route of each mobile switching center in the mobile switching center pool. When a mobile switching center fails, the signaling is forwarded to the mobile switching center backup routing The designated standby mobile switching center performs subsequent call processing. The mobile switching centers 21, 22, and 23 in this embodiment should also have the function of backing up the location area information of the user terminals of one or more mobile switching centers, so as to initiate paging for the current location area of the terminal in the future. In the prior art, there is a problem of network congestion caused by initiating a network-wide paging to a terminal. Simultaneously, since the mobile switching center backs up the location area information of the user terminals of one or more mobile switching centers, the methods described in Fig. 2-Fig. The terminal transfers and registers with another effective mobile switching center. For details, please refer to the description in the above method, which will not be repeated here.

FIG. 9 is a schematic structural diagram of Embodiment 2 of the communication system of the present invention. In the embodiment shown in Fig. 9, the network equipment is specifically the home location register 11, and also includes a base station controller (BSC) 31, which is connected with the mobile switching center 21, 22, 23, and is used for receiving the paging message of the mobile switching center. The paging response message of the terminal is returned to the mobile switching center that sent the paging message; and the corresponding message between the mobile switching center and the terminal is forwarded, and the rest is similar to Figure 8, and the same parts will not be repeated.

In the embodiment shown in Fig. 9, the mobile switching center is refined, and the mobile switching center 23 includes: a storage module 232, which is used to store the non-locally registered terminal location area information of the active mobile switching center and the valid information of the active mobile switching center. State; response module 231, connected with storage module 232, used to automatically initiate a paging message to the current location area of the terminal of the invalid mobile switching center when the active mobile switching center fails, and receive a non-locally registered terminal paging After the response message, send the request message for reallocating TMSI. Other mobile switching centers have the same internal structure as the mobile switching center 21 or 22 shown in FIG.

FIG. 10 is a schematic structural diagram of Embodiment 3 of the communication system of the present invention. In this embodiment, the network equipment is specifically the signaling transfer point 12, and also includes a radio network controller 32, which is connected to the mobile switching centers 21', 22', 23', and is used to send The paging response message of the terminal is returned to any active mobile switching center; and the corresponding message between the mobile switching center and the terminal is forwarded.

In the embodiment shown in Fig. 10, the mobile switching center is refined, and the mobile switching center 23' of this embodiment includes: a storage module 232', which is used to store non-locally registered terminal location area information of other mobile switching centers; a response module 231 ', connected with the storage module 232', used to provide a roaming number request (PRN) message to the terminal of the invalid mobile switching center after receiving the terminal of a certain invalid mobile switching center forwarded by the signaling transfer point. The location area initiates a paging message, and sends a request message for reassigning a TMSI after receiving a paging response message from a non-locally registered terminal. Other mobile switching centers have the same internal structure as the mobile switching center 21' or 22' as shown in Fig. 10 , so no more examples are given.

Fig. 11 is a schematic diagram of the implementation of the mobile switching center of the present invention. This embodiment provides a mobile switching center, which is also provided with:

A storage module 42, configured to store location area information of non-locally registered terminals of one or more other mobile switching centers;

The response module 41 is connected with the storage module 42, and is used for initiating a paging message to the current location area of the terminal after receiving the terminal called information forwarded by a mobile switching center in the one or more other mobile switching centers after failure , after receiving a paging response message from a non-locally registered terminal, send a request message for reassigning the TMSI.

Fig. 12 is a schematic structural diagram of Embodiment 2 of the mobile switching center of the present invention. This embodiment provides another mobile switching center, including a mobile switch, and the existing mobile switch is also provided with:

A storage module 42, configured to store location area information of non-locally registered terminals of one or more other mobile switching centers and valid states of the one or more other mobile switching centers;

The response module 41 is connected with the storage module 42, and is used to automatically initiate a paging message to the current location area of the terminal of the failed mobile switching center when one or more mobile switching centers of the one or more other mobile switching centers are detected to be invalid , after receiving a paging response message from a non-locally registered terminal, send a request message for reassigning the TMSI.

Fig. 13 is a schematic structural diagram of Embodiment 3 of the mobile switching center of the present invention. The present embodiment provides yet another mobile switching center, including a mobile switch 8, and also includes:

The storage module 62 is connected with the mobile switch 8, and is used for storing location area information of non-locally registered terminals of one or more other mobile switching centers;

The response module 61 is connected with the storage module 62, and is used for initiating a paging message to the current location area of the terminal after receiving the terminal called information forwarded by a mobile switching center after failure, and receiving a non-locally registered terminal paging response message Then send a request message to reassign the TMSI.

Fig. 14 is a schematic structural diagram of Embodiment 4 of the mobile switching center of the present invention. Mobile switching center in the present embodiment, comprises mobile exchange 8, also comprises:

The storage module 72 is connected with the mobile switch 8, and is used for storing location area information of non-locally registered terminals of one or more other mobile switching centers and the valid state of the mobile switching center;

The response module 71 is connected with the storage module 72, and is used to automatically initiate a paging message to the current location area of the terminal of the invalid mobile switching center when detecting that one or more mobile switching centers and lowers of one or more other mobile switching centers fail, After receiving a paging response message from a non-locally registered terminal, send a request message for reallocating TMSI.

In summary, in the present invention, when a mobile switching center fails, the backup mobile switching center of the failed mobile switching center can establish a wireless connection to the terminal by initiating paging to the terminal of a non-registered user and receiving a paging response message , initiate a request message to reassign the TMSI, migrate the users of the faulty mobile switching center, and register the terminal to other mobile switching centers in the mobile switching center pool, thereby restoring the called service of the terminal and effectively solving the problem of the faulty mobile switching center The called problem of the terminal. The present invention can select the standby mobile switching center designated by the standby route, and the standby mobile switching center backs up the current location area information of the terminal belonging to the invalid mobile switching center, without upgrading the network equipment of the whole network; each mobile switching center is configured The standby mobile switching center does not need to implement the selection algorithm, and does not affect the service processing capability of the equipment; the standby mobile switching center has backed up the current location area information of the terminal, and only performs paging in a specific location to avoid wireless paging caused by the entire network. The channel is congested, and the dynamic data only backs up the basic location information of the terminal. The backup data is small and easy to implement. For all interfaces, such as the A interface or the IU interface, the recovery of the called service of the terminal can be realized. The implementation method is simple, and the main and standby routes of the supporting equipment are respectively sent to the main and standby mobile switching centers by using existing equipment such as STP, so that the terminal can be solved. called problem.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (36)

1. the restoration methods of a terminal called service is characterized in that, comprising:

Step 1, the acquisition of subsequent use mobile switching centre belong to the present position-region information at the terminal of inefficacy mobile switching centre, and beep-page message is initiated in said present position-region in the terminal;

Step 2, receive that the mobile switching centre of page-response message sends the request message redistribute TMSI;

Step 3, terminal are registered to arbitrary effective mobile switching centre in the mobile switching centre pond at inefficacy mobile switching centre place according to described request message.

2. the restoration methods of terminal called service according to claim 1 is characterized in that, said step 1 is specially:

Attaching position register is forwarded to the subsequent use mobile switching centre of inefficacy mobile switching centre through the signal switching PRN request message of naming a person for a particular job;

Subsequent use mobile switching centre obtains the present position-region information at terminal from its Backup Data;

Subsequent use mobile switching centre initiates beep-page message to the terminal present position-region.

3. the restoration methods of terminal called service according to claim 2 is characterized in that, attaching position register comprises through the signal switching subsequent use mobile switching centre that the PRN request message is forwarded to inefficacy mobile switching centre that names a person for a particular job:

The called request message of attaching position register receiving terminal; Obtain the current VLR Visitor Location Register/mobile switching centre at terminal, the current VLR Visitor Location Register/mobile switching centre to the terminal sends the PRN request message that is used to obtain the terminal roaming number through Signalling Transfer Point;

Behind the fail message of the current VLR Visitor Location Register/mobile switching centre at Signalling Transfer Point acquisition terminal said PRN request message is forwarded to subsequent use mobile switching centre through alternate routing.

4. the restoration methods of terminal called service according to claim 2 is characterized in that, attaching position register also comprises after being forwarded to the subsequent use mobile switching centre of inefficacy mobile switching centre through the signal switching PRN request message of naming a person for a particular job:

Subsequent use mobile switching centre sends PRN request failure information or does not respond said PRN request message to attaching position register.

5. the restoration methods of terminal called service according to claim 1 is characterized in that, said step 1 is specially:

After subsequent use mobile switching centre obtains the fail message of inefficacy mobile switching centre, from its Backup Data, obtain the present position-region information and the IMSI information at terminal;

It is the beep-page message of sign that subsequent use mobile switching centre initiates with IMSI the terminal present position-region automatically.

6. the restoration methods of terminal called service according to claim 5 is characterized in that, the fail message that said subsequent use mobile switching centre obtains inefficacy mobile switching centre is specially:

When finding that mobile switching centre lost efficacy, adopt manual type this mobile switching centre on attaching position register or Signalling Transfer Point to be set to failure state, and send the fail message of said inefficacy mobile switching centre to subsequent use mobile switching centre.

7. the restoration methods of terminal called service according to claim 5 is characterized in that, the fail message that said subsequent use mobile switching centre obtains inefficacy mobile switching centre is specially:

The data sync link of subsequent use mobile switching centre through mobile switching centre, said automatically inefficacy mobile switching centre is set to failure state when finding that inefficacy mobile switching centre does not correctly respond.

8. the restoration methods of terminal called service according to claim 5 is characterized in that, the fail message that said subsequent use mobile switching centre obtains inefficacy mobile switching centre is specially:

Subsequent use mobile switching centre finds to produce when inefficacy mobile switching centre does not correctly respond alarm through the data sync link of mobile switching centre, and mobile switching centre is set to failure state by the definite and said inefficacy of manual work.

9. the restoration methods of terminal called service according to claim 1; It is characterized in that; Also comprise: when not having the present position-region information at terminal in the Backup Data of said subsequent use mobile switching centre, subsequent use mobile switching centre initiates beep-page message from the All Ranges that the mobile switching centre pond at place, trend terminal covers.

10. the restoration methods of terminal called service according to claim 1; It is characterized in that; Also comprise: when not having the present position-region information at terminal in the Backup Data of said subsequent use mobile switching centre, subsequent use mobile switching centre is that sign is initiated beep-page message to the All Ranges that the mobile switching centre pond at place, terminal covers with IMSI through manual type.

11. the restoration methods according to the described arbitrary terminal called service of claim 1-10 is characterized in that, also comprises before the said step 2:

Second generation mobile communications network terminal is received behind the said beep-page message and to be returned the page-response message that comprises the IMSI sign from the A interface between base station controller and the core net.

12. the restoration methods of terminal called service according to claim 11 is characterized in that, described step 2 specifically comprises:

Subsequent use mobile switching centre knows that from the page-response message that receives the terminal is the nonregistered user of subsequent use mobile switching centre;

Subsequent use mobile switching centre sends the request message of redistributing TMSI, comprises the temporary mobile subscriber identity and the non-broadcast location district message that do not have the Internet resources sign in the described request message.

13. the restoration methods according to the described arbitrary terminal called service of claim 1-10 is characterized in that, also comprises before the said step 2:

The 3G (Third Generation) Moblie network terminal returns the page-response message that comprises the TMSI sign from the Iu interface between radio network controller and the core net after receiving said beep-page message.

14. the restoration methods of terminal called service according to claim 13 is characterized in that, described step 2 specifically comprises:

Mobile switching centre outside subsequent use mobile switching centre, the inefficacy mobile switching centre knows that from the page-response message that receives the terminal is the nonregistered user of this mobile switching centre;

Mobile switching centre outside said subsequent use mobile switching centre, the inefficacy mobile switching centre sends the request message of redistributing TMSI, comprises the temporary mobile subscriber identity and the non-broadcast location district message that do not have the Internet resources sign in the described request message.

15. the restoration methods of terminal called service according to claim 13 is characterized in that, described step 2 specifically comprises:

Subsequent use mobile switching centre knows that from the page-response message that receives the terminal is the nonregistered user of subsequent use mobile switching centre;

Subsequent use mobile switching centre sends the request message of redistributing TMSI, comprises the temporary mobile subscriber identity and the non-broadcast location district message that do not have the Internet resources sign in the described request message.

16. the restoration methods according to the described arbitrary terminal called service of claim 1-10 is characterized in that, described step 3 comprises:

Location update message is sent after receiving the request message of the said TMSI of redistributing in the terminal, with said endpoint registration in the mobile switching centre pond in arbitrary effective mobile switching centre;

The mobile switching centre that registers said terminal upgrades the attaching position register at said terminal, and receives terminal use's data that attaching position register sends.

17. the restoration methods of terminal called service according to claim 12 is characterized in that, described step 3 comprises:

Location update message is sent after receiving the request message of the said TMSI of redistributing in the terminal, with said endpoint registration in the mobile switching centre pond in arbitrary effective mobile switching centre;

The mobile switching centre that registers said terminal upgrades the attaching position register at said terminal, and receives terminal use's data that attaching position register sends.

18. the restoration methods of terminal called service according to claim 14 is characterized in that, described step 3 comprises:

Location update message is sent after receiving the request message of the said TMSI of redistributing in the terminal, with said endpoint registration in the mobile switching centre pond in arbitrary effective mobile switching centre;

The mobile switching centre that registers said terminal upgrades the attaching position register at said terminal, and receives terminal use's data that attaching position register sends.

19. the restoration methods of terminal called service according to claim 15 is characterized in that, described step 3 comprises:

Location update message is sent after receiving the request message of the said TMSI of redistributing in the terminal, with said endpoint registration in the mobile switching centre pond in arbitrary effective mobile switching centre;

The mobile switching centre that registers said terminal upgrades the attaching position register at said terminal, and receives terminal use's data that attaching position register sends.

20. the restoration methods of terminal called service according to claim 16 is characterized in that, the mobile switching centre that registers said terminal obtains terminal use's data from attaching position register alternately through one or many.

21. the restoration methods of terminal called service according to claim 17 is characterized in that, the mobile switching centre that registers said terminal obtains terminal use's data from attaching position register alternately through one or many.

22. the restoration methods of terminal called service according to claim 18 is characterized in that, the mobile switching centre that registers said terminal obtains terminal use's data from attaching position register alternately through one or many.

23. the restoration methods of terminal called service according to claim 19 is characterized in that, the mobile switching centre that registers said terminal obtains terminal use's data from attaching position register alternately through one or many.

24. a communication system is characterized in that, comprising:

The network equipment is used to preserve mobile switching centre pond and mobile switching centre thereof and terminal information;

The mobile switching centre pond comprises a plurality of mobile switching centres; Said mobile switching centre is connected with the network equipment, is used for the terminal present position-region of inefficacy mobile switching centre is initiated beep-page message; The page-response message of non-local registration terminal is sent the request message of redistributing TMSI, the terminal is registered in the mobile switching centre pond in arbitrary effective mobile switching centre again;

The terminal of interior one or more other mobile switching centre of each mobile switching centre's backup pool and location area information are as the subsequent use mobile switching centre of said one or more other mobile switching centre in the said mobile switching centre pond.

25. communication system according to claim 24 is characterized in that, the said network equipment is an attaching position register.

26. communication system according to claim 24; It is characterized in that; The said network equipment is a Signalling Transfer Point; Said Signalling Transfer Point disposes the alternate routing of each mobile switching centre in the mobile switching centre pond, when losing efficacy in a certain mobile switching centre, signaling is forwarded to the specified subsequent use mobile switching centre of this mobile switching centre's alternate routing carries out the subsequent voice calls processing.

27. communication system according to claim 26 is characterized in that, said mobile switching centre comprises:

Memory module is used to store the non-local registration terminal location area information of one or more other mobile switching centre;

Respond module; Be connected with memory module; Be used for behind the PRN request message at the terminal of a certain inefficacy mobile switching centre of receiving that Signalling Transfer Point transmits; Terminal present position-region to said inefficacy mobile switching centre is initiated beep-page message, sends the request message of redistributing TMSI after receiving non-local registration terminal page-response message.

28., it is characterized in that said mobile switching centre comprises according to the described arbitrary communication system of claim 24-26:

Memory module is used to store the non-local registration terminal location area information of one or more other mobile switching centre and the effective status of one or more other mobile switching centre;

Respond module; Be connected with memory module; When being used for losing efficacy in one or more mobile switching centres of said certain one to multiple other mobile switching centre; Automatically the present position-region at the terminal of inefficacy mobile switching centre is initiated beep-page message, send the request message of redistributing TMSI after receiving non-local registration terminal page-response message.

29. according to the described arbitrary communication system of claim 24-27, it is characterized in that, also comprise:

Base station controller is connected with mobile switching centre, the page-response message at terminal is returned the mobile switching centre that sends beep-page message after being used to receive the beep-page message of mobile switching centre; And the corresponding message between forwarding mobile switching centre and the terminal.

30. according to the described arbitrary communication system of claim 24-27, it is characterized in that, also comprise:

Radio network controller is connected with mobile switching centre, the page-response message at terminal is returned arbitrary effective mobile switching centre after being used to receive the beep-page message of mobile switching centre; And the corresponding message between forwarding mobile switching centre and the terminal.

31. communication system according to claim 28 is characterized in that, also comprises:

Base station controller is connected with mobile switching centre, the page-response message at terminal is returned the mobile switching centre that sends beep-page message after being used to receive the beep-page message of mobile switching centre; And the corresponding message between forwarding mobile switching centre and the terminal.

32. communication system according to claim 28 is characterized in that, also comprises:

Radio network controller is connected with mobile switching centre, the page-response message at terminal is returned arbitrary effective mobile switching centre after being used to receive the beep-page message of mobile switching centre; And the corresponding message between forwarding mobile switching centre and the terminal.

33. a mobile switching centre comprises mobile switch, it is characterized in that, said mobile switch is provided with:

Memory module is used to store the location area information of the non-local registration terminal of one or more other mobile switching centre;

Respond module; Be connected with memory module; After being used for receiving the terminal called information that lost efficacy a certain mobile switching centre of said one or more other mobile switching centre the back transmits the present position-region at said terminal is initiated beep-page message, send the request message of redistributing TMSI after receiving non-local registration terminal page-response message.

34. a mobile switching centre comprises mobile switch, it is characterized in that, said mobile switch is provided with:

Memory module is used to store location area information and the effective status of said one or more other mobile switching centre of the non-local registration terminal of one or more other mobile switching centre;

Respond module; Be connected with memory module; When the one or more mobile switching centres that are used to detect said one or more other mobile switching centre lost efficacy; Automatically the present position-region at the terminal of inefficacy mobile switching centre is initiated beep-page message, send the request message of redistributing TMSI after receiving non-local registration terminal page-response message.

35. a mobile switching centre comprises mobile switch, it is characterized in that, also comprises:

Memory module is connected with mobile switch, is used to store the location area information of the non-local registration terminal of one or more other mobile switching centre;

Respond module; Be connected with memory module; After being used to receive the terminal called information that lost efficacy a mobile switching centre back transmits the present position-region at said terminal is initiated beep-page message, send the request message of redistributing TMSI after receiving non-local registration terminal page-response message.

36. a mobile switching centre comprises mobile switch, it is characterized in that, also comprises:

Memory module is connected with mobile switch, is used to store location area information and the effective status of said mobile switching centre of the non-local registration terminal of one or more other mobile switching centre;

Respond module; Be connected with memory module; When the one or more mobile switching centres that are used to detect said one or more other mobile switching centre lost efficacy; Automatically the present position-region at the terminal of inefficacy mobile switching centre is initiated beep-page message, send the request message of redistributing TMSI after receiving non-local registration terminal page-response message.

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