WO2010048881A1 - Method, apparatus and system for user service connection during network fault - Google Patents

Abstract

A method, apparatus and system for user service connection during the network fault are provided. The method includes: when the user of the failed Mobile Switching Center (MSC) in the pool is called, the functional device of the pool forwards the paging message issued by the normal MSC to the user; the functional device acquires the paging response message returned by the user, and routes the TMSI paging response message to the normal MSC in case the paging response message is the Temp Mobile Subscriber Identity (TMSI) paging response message. When the user of the failed MSC in the pool is called, the above technical scheme can guarantee that the successful communication is enabled when the user experiences the first communication service.

Description

 Instruction manual

Title of Invention: Method, device and system for user service connection in case of network failure

[1] This application claims priority to Chinese Patent Application No. 200810225185.0, entitled "Network Failure, User Service Connection Method, Apparatus and System", which was filed on October 30, 2008. The content is incorporated herein by reference.

[2] Technical field

 [3] The present invention relates to the field of communications technologies, and in particular, to a network fault, user service connection method, apparatus, and system.

[4] Background of the invention

 [5] At present, Wideband Code Division Multiple Access (WCDMA: Wideband Code Division Multiple Access)

Technology, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) technology, Global System for Mobile (GSM: Global System of Mobile)

 Communication) The Iu-Flex function is introduced in the field, ie Radio Network Controller (RNC: Radio Netword Control) / Base Station System Controller (BSC: Base Station)

 Control) Supporting the intra-domain connection routing function of one RNC/BSC node to multiple core network (CN) nodes The Iu-Flex-based networking can be as shown in Figure 1, and the pool area (Pool Area) is centralized with multiple mobile exchanges. Center (MSC: Mobile Switch Center) and RNC, multiple MSCs in a regional pool can achieve load balancing, and the service range provided by them covers the entire pool area, which can reduce CN node update, handover and relocation operations, and reduce attribution. Location Register (HLR: Home Location Register)

Equipment) Moving in this area does not require changing the service CN node.

The advantage of the existing Iu-Flex based networking mode is that when an MSC failure is not available, other MSCs can take over the users of the failed MSC, so that the service is not affected. For example, when the user performs the calling service, although the MSC to which the home belongs fails, the other normal MSC can take over the calling operation of the user, so that the calling operation of the user can be performed normally. [8] Existing technical solutions for implementing network failures and user call services In the specific implementation process, there is no guarantee that the user of the faulty MSC will succeed in the first communication of the called service.

[9] Summary of the invention

 [10] The technical problem to be solved by the embodiments of the present invention is to provide a network fault, user service connection method, device, and system, so as to ensure that the user of the MSC that has failed has a called service, and the first communication can be successful.

 [11] The embodiment of the present invention provides a network fault/user service connection method, including:

 [12] When the user of the faulty mobile switching center in the pool area experiences the called service, the function device in the pool area forwards the paging message delivered by the normal mobile switching center to the user;

[13] The function device acquires a paging response message returned by the user, and if the paging response message is a mobile subscriber identity TMSI paging response message, routing the TMSI paging response message to The normal mobile switching center.

[14] The embodiment of the present invention further provides a network fault/user service connection device, including:

[15] The paging message forwarding module is used to generate a called service when a user belonging to the faulty mobile switching center in the pool area

Forwarding the paging message delivered by the normal mobile switching center to the user;

[16] a paging response message forwarding module, configured to acquire a paging response message that is returned by the user and is forwarded by the paging message forwarding module, where the paging response message is In the case of a mobile subscriber identity TMSI page response message, the TMSI page response message is routed to the normal mobile switching center.

 [17] The embodiment of the present invention further provides a network fault/user service connection system, including:

 [18] The mobile switching center, which is a normal mobile switching center, is configured to send a paging message to the user of the faulty mobile switching center, and send a paging message instead of the faulty mobile switching center;

[19] a function device in the pool area, configured to forward a paging message sent by the mobile switching center to the user, and receive a paging response message returned by the user, where the paging response message is a temporary message Mobile subscriber identity T

In the case of an MSI Paging Response message, the TMSI Paging Response message is routed to the normal mobile switching center.

[20] It can be seen from the technical solution provided by the foregoing embodiment of the present invention that, in the embodiment of the present invention, when the called service is generated by the user belonging to the faulty mobile switching center in the pool area, the functional device in the pool area will move normally. The paging message sent by the switching center is forwarded to the user; the function device acquires a paging response message returned by the user, and routes the paging response message to the normal according to the paging response message. Mobile switching center. Therefore, when the user of the MSC that has failed in the pool area has a called service, the user is ensured that the communication is successful when the first communication service occurs.

[21] BRIEF DESCRIPTION OF THE DRAWINGS

 [22] Figure 1 is a schematic diagram of the existing Iu-Flex-based networking structure;

 FIG. 2 is a first schematic diagram of an application scenario of the method according to an embodiment of the present disclosure;

 FIG. 3 is a flowchart of a first implementation of the method according to an embodiment of the present disclosure;

 FIG. 4 is a second schematic diagram of an application scenario of the method according to an embodiment of the present disclosure;

 FIG. 5 is a flowchart of a second implementation of the method according to an embodiment of the present disclosure;

 FIG. 6 is a schematic structural diagram of the apparatus according to an embodiment of the present invention.

 [28] Mode for carrying out the invention

 The present invention will be further described in detail below with reference to the accompanying drawings.

 [30] The network fault/user service connection method provided by the embodiment of the present invention, when the called service is generated by the user belonging to the faulty mobile switching center in the pool area, the paging sent by the normal mobile switching center by the functional device in the pool area The message is forwarded to the user, and then the function device acquires the paging response message returned by the user, and routes the paging response message to the normal mobile switching center according to the paging response message. Therefore, it is ensured that the user of the MSC that has the fault has a called service, and the communication service can be implemented. Moreover, the embodiment of the present invention performs a corresponding search operation according to the paging response message by the function device in the pool area, thereby ensuring that the paging response message returned by the user can be routed to the mobile switching center that sends the corresponding paging message. It ensures that the user can successfully communicate successfully after the first called service occurs. The normal mobile switching center in this embodiment is a non-faulty mobile switching center in the pool area.

 [31] It should be noted that the functional device in the pool area involved in the embodiment of the present invention may be an existing device, such as a node with a non-access stratum node selection function (NNSF: NAS Node Selectiong Functiong), or A functional device designed for new design. For ease of understanding, in the following embodiments of the present invention, the NNSF node is taken as an example for description.

[32] In the network fault/user service connection method provided by the embodiment of the present invention, the _MSC that sends the paging message is The paging message is not sent directly to the called user, but is sent to the called user through the NNSF node, and the paging response message returned by the user is routed by the NNSF node to the MSC that sends the corresponding paging message. Therefore, the MSC that sends the paging message can smoothly obtain the corresponding paging response message.

 [33] An application scenario of a specific implementation of the network fault/user service connection method provided by the embodiment of the present invention may be as shown in FIG. 2, when the user belonging to the faulty MSC in the pool area has a called service, the independent existence exists. The data backup center selects the normal MSC in the pool area to replace the faulty MSC, and the normal MSC sends a paging message through the NNSF node. For the sake of understanding, in the embodiment of the present invention, the faulty MSC is MSC1 and the normal MSC is MSC2 as an example.

 [34] As shown in FIG. 3, the specific implementation process of this embodiment includes:

 [35] Step 301: When the called service is generated, the data backup center obtains the Provide Roaming Number (PRN) message sent by the HLR through the alternate path.

 [36] Step 302: The data backup center selects the normal MSC in the pool area, such as MSC2, by using a random selection, a round selection, a configuration relationship, or a load balancing algorithm.

 [37] It should be noted that, in this step, the data backup center may send a request message for obtaining a roaming number to the MSC2. In addition to carrying the user identifier, the request message may also carry the location information of the user. The location information is not required in the request message. The MSC2 may also query the location information of the user according to the user identifier to the data backup center after receiving the request message from the data backup center.

 [38] Step 303: The normal MSC sends a paging message to the NNSF node according to the acquired user location information.

 [39] Step 304: The NNSF node sends a paging message to the user.

 [40] The paging message includes an IMSI (Inter Mobile Subscriber Identity) paging message or a Temp Mobile Subscriber Identity (TMSI) paging message.

[41] Step 305: The NNSF node receives the paging response message returned by the user.

[42] Step 306: The NNSF node routes the paging response message to the MSC that sends the corresponding paging message.

[43] It should be noted that, in the prior art processing solution, if the delivered paging message is a TMSI paging message, the corresponding paging response message includes TMSI information, and the RNC can parse out from the TMSI information. Network Resource Identifier (NRI). Since the user is registered in the failed MSC1 in advance, the NRI indicates that the MSC1 is still present, and the RNC should page the TMSI. The response message is routed to MSC1. However, because MSC1 has failed, RNC can only choose a normal MSC in the pool area, which may be MSC2 or MSC3. If the RNC routes the paging response message to the MSC3, the MSC3 does not deliver the corresponding paging message. Therefore, after receiving the paging response message, the MSC3 can only complete the location update, so that the user registers with the MSC3. The MSC information in the user data in the HLR is updated to be MSC3, and the operation of assigning the mobile station roaming number (MSRN: Mo bile Station Roaming Number) to the user is not implemented. Only after the second occurrence of the called service, the HLR sends the PRN request message to MSC3, and the called service is completed by MSC3.

[44] In addition, in the prior art solution, if the IMS delivers the IMSI paging message, the corresponding paging response message may carry the IMSI information, or may be the TMSI information, because, in 2G GSM. In the mode, the paging response message carries the IMSI information; in the 3G WCDMA mode, if the TMSI information in the called user terminal is valid, according to the 3GPP 23.236 protocol, the user terminal sends the non-access stratum node selection to the intra-domain of the RNC. (IDNNS: Intra Domain NAS Node

 The Selector) carries the TMSI information in the cell and contains the NRI information. Then, as described above, the RNC cannot guarantee that the TMSI paging response message is routed to the MSC that sends the corresponding paging message, so that the communication success can be achieved when the called service is first generated by the user.

 [45] Then, in order to solve the technical defects existing in the prior art, the embodiment of the present invention proposes that the NNSF node is responsible for the paging message and the paging response message forwarding operation between the MSC that issues the paging message and the user. And the NNSF node ensures that the paging response message is routed to the MSC that sends the corresponding paging message.

 [46] Specifically, in this step, the method for the NNSF node to ensure that the paging response information is routed to the MSC that sends the paging message may be specifically:

 [47] 1) In the case that the paging message is a TMSI paging message, the NNSF node learns to deliver the corresponding paging message.

The manner of the MSC information may specifically include but is not limited to:

[48] The NNSF node queries all MSCs in the pool area to inquire which MSC has sent the corresponding TMSI paging message.

Obtain corresponding MSC information according to the query result; or

[49] The NNSF node queries the data backup center to send the MSC information corresponding to the paging message, and learns to send the MSC information corresponding to the TMSI paging message according to the query result; or

[50] The NNSF node learns the MSC information corresponding to the TMSI paging message according to the configured correspondence, for example, Corresponding relationship between the pre-specified faulty MSC and the normal MSC working in place of the faulty MSC (such as MS)

After C1 failure, the called service is taken over by MSC2, and the called message is fixedly routed to MSC2) when the NNSF acquires the MSC1 node failure according to the NRI; or

[51] The NNSF node broadcasts a paging response message to all MSCs in the pool area, and the MSC that sends the corresponding paging message receives the paging response message and processes the subsequent process, and the other MSC discards the paging response message.

[52] 2) If the paging message sent is IMS, the paging response message may be IMSI information or TMSI information.

 [53] If the paging response message carries the TMSI information, the corresponding processing is the same as the process described in the above 1);

 [54] If the paging response message carries the IMSI information, according to the 3GPP 23.236, the NNSF node records the association relationship between the IMSI paging message and the MSC that issues the IMS paging message after the paging message is sent. In this case, the NNSF node can find the MSC that sent the paging according to the recorded association relationship.

 [55] Step 307, after receiving the paging response message, the MSC2 completes the registration of the user in the MSC2, and allocates the MSR.

N.

 [56] The MSC2 may also return a response message corresponding to the request message for obtaining the roaming number sent by the data backup center to the MSC2 to the data backup center, where the message includes the MSRN.

[57] Step 308: The data backup center returns a PRN ACK (PRN Reply message) message to the HLR, where the message includes the MSRN.

 [58] The Gateway Mobile Switching Centre (GMSC) initiates an incoming call according to the MSRN, routes an Initial Address Message (IAM) to the MSC2, and completes the subsequent called procedure.

 [ 00 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The NNSF node in the pool area performs a corresponding search operation according to the paging response message, thereby ensuring that the paging response message returned by the user can be routed to the mobile switching center that sends the corresponding paging message, ensuring that the user belonging to the faulty MSC is occurring. The called business 吋, the first communication can be successful.

[60] Another embodiment of the network fault/user service connection method provided by the embodiment of the present invention may also be applied to the scenario shown in FIG. 4, where there is no independent data backup node, and the pool is used. Each in the district The user data of the MSC1 and the MSC2 are backed up to the MSC3, and the user data of the MSC3 is backed up to the MSC2, and the corresponding low-priority route is configured, as shown by the dotted line in FIG.

As shown in FIG. 5, the specific implementation process of this embodiment may include:

 [62] Step 501: If the MSC1 fails, the high-priority path of the HLR to the MSC1 is unavailable. In the called service flow, the PRN request message of the HLR to the MSC1 passes the low priority path to the MSC3.

 [63] Step 502: The MSC3 queries the location area information of the user from the backup data in the PRN request message according to the user identifier in the PRN request message, and performs step 503 through the NNSF node to send the user to the user in the corresponding location area. Call the message.

 [64] Step 504: The NNSF node acquires a paging response message returned by the user.

[65] Step 505: The NNSF node routes the paging response message to the MSC that sends the corresponding paging message.

[66] In this step, the method for the NNSF node to ensure that the paging response information is routed to the MSC that sends the corresponding paging message may be:

 [67] 1) In the case that the paging message is a TMSI paging message, the manner in which the NNSF node learns the MSC information of the paging message may specifically include, but is not limited to:

[68] The NNSF node queries all MSCs in the pool area to inquire which MSC has sent the corresponding TMSI paging message.

Obtain corresponding MSC information according to the query result; or

[69] The NNSF node queries the data backup center (such as MSC3) for the MSC information of the paging message, and obtains the MSC information corresponding to the TMSI paging message according to the query result; or

[70] The NNSF node learns to send the MSC information corresponding to the TMSI paging message according to the configured correspondence relationship; or [71] the NNSF node broadcasts the paging response message to all the MSCs in the pool area, and the MSC that sends the paging message receives After the subsequent process is processed, other MSCs discard the message.

[72] 2) If the delivered paging message is an IMS paging message, the paging response message may be IMSI information or TMSI information.

[73] If the paging response message carries the TMSI information, the corresponding processing is the same as the process described in the above 1);

[74] If the paging response message carries the IMSI information, according to the 3GPP 23.236, the NNSF node records the correspondence between the IMSI paging message and the MSC that sends the IMSI paging message after the paging message is sent. In this case, the NNSF node can find the MSC that sends the paging according to the recorded correspondence. [75] Step 506: After receiving the paging response message returned by the user, the MSC3 returns a PRN ACK message to the HLR.

[76] Step 506 is substantially the same as steps 307 and 308, and therefore will not be described in detail.

 [77] It should be noted that if the MSC3 that serves as the data backup evenly distributes the services of the faulty MSC to other normal MSCs in the pool area, the MSC3 can be regarded as an independent data backup center. The process described in steps 301 through 308 is used to implement the present invention.

 [78] It can be seen from the above description that the network fault/user service connection method provided by the embodiment of the present invention can smoothly complete the operation of the called service generated by the user in the case that the MSCs in the pool area are mutually backed up, and In the embodiment of the present invention, the NNSF node in the pool area performs a corresponding search operation according to the paging response message, thereby ensuring that the paging response message returned by the user can be routed to the MSC that sends the corresponding paging message, ensuring the fault. The user who belongs to the MSC can successfully communicate for the first time after the called service occurs.

 The embodiment of the invention further provides a network fault/user service connection device. The apparatus may specifically be a device having a non-access stratum node selection function (NNSF: NAS Node Selectiong Functiong).

 [80] As shown in FIG. 6, the device may specifically include:

 [81] 1) The paging message forwarding module 610 is configured to forward the paging message delivered by the normal MSC to the user when the user belonging to the faulty MSC in the pool area has a call service.

[82] 2) The paging response message forwarding module 620 is configured to obtain a paging response message returned by the user, and route the paging response message to the normal MSC according to the paging response message.

[83] The paging response message forwarding module 620 may specifically include:

 [84] The paging response message receiving module 621 is configured to receive a paging response message returned by the user, and trigger the searching module 622.

 [85] The search module 622 is configured to: under the trigger of the paging response message receiving module 621, find an MSC that sends a corresponding paging message;

[86] The specific operation process of the search module 622 may include:

 [87] 1) If the paging response message is a mobile subscriber identity (TMSI: Temp Mobile Subscriber)

The MSC message of the corresponding T MSI paging message is obtained by querying all the MSCs in the pool area by the Query message 622; or

[88] The search module 622 obtains the MSC information corresponding to the TMSI paging message by querying the data backup center. ; or

 [89] The query module 622 obtains the MSC information corresponding to the TMS call message according to the configuration relationship; or

[90] The locating module 622 broadcasts the TMSI paging response message to all MSCs in the pool area, and the MSC that sends the corresponding TMSI paging message reserves the TMS call response message, and performs subsequent procedures, and the other MSC discards the

TMSI paging response message;

 [91] 2) If the paging response message is an international mobile subscriber identity (IMSI: Inter Mobile Subscriber)

 And the MSC message of the IMSI paging message is sent by the paging according to the association relationship between the corresponding IMSI paging message and the MSC that sends the IMSI paging message. The response message routing module 623 routes the IMSI page response message to the MSC.

 [92] The paging response message routing module 623 is configured to route the paging response message received by the paging response message receiving module 621 to the searching module 622 to find the determined MSC.

 [93] It can be seen from the above description that the network fault/user service connection apparatus provided by the embodiment of the present invention can implement the paging response message to the MSC that sends the corresponding paging message by using the corresponding search operation, thereby In the case that the MSC fault of the user is unavailable, it is ensured that the normal MSC replaces the faulty MSC to successfully complete the call process of the user, and ensures that the user succeeds in the communication after the first called service occurs, thereby improving the service quality of the network. , improved customer satisfaction.

 An embodiment of the present invention further provides a network fault/user service connection system, which includes the apparatus shown in FIG. 6 provided by the embodiment of the present invention. The system may also specifically include other functional devices required for the normal operation of the system, such as multiple MSCs, home location registers, data backup centers, signaling transfer points, and the like. The specific operation procedure of the network fault 吋 user service splicing device as shown in FIG. 6 provided by the embodiment of the present invention has been described, and other functional devices in the system have prior art, so the specific operation process of the system is no longer praised. Said.

 [95] It can be seen from the above description that the network fault/user service connection system provided by the embodiment of the present invention can implement the paging operation message to the MSC that sends the corresponding paging message through the corresponding search operation, thereby In the case that the MSC fault of the user is not available, it is ensured that the normal MSC replaces the faulty MSC to successfully complete the call process of the user, and ensures that the user succeeds in the communication after the first call service occurs, thereby improving the service quality of the network. Increased customer satisfaction.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be borrowed. It is also possible to implement the software plus the necessary hardware platform, and of course it can be implemented entirely by hardware, but in many cases the former is a better implementation. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily think of within the technical scope disclosed by the present invention. Changes or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim  [Claim 1] A network fault/user service connection method, which is characterized in that:  The paging message sent by the normal mobile switching center is forwarded to the user by the function device in the pool area when the user belongs to the faulty mobile switching center in the pool area; the function device obtains the search returned by the user And responding to the message, in the case that the paging response message is a mobile subscriber identity TMSI paging response message, routing the TMSI paging response message to the normal mobile switching center.  [Claim 2] The method according to claim 1, wherein the functional device in the pool area selects a function NNSF node for the non-access stratum node.  [Claim 3] The method according to claim 1, wherein: routing the TMSI paging response message to the normal mobile exchange) comprises:  The functional device broadcasts the TMSI paging response message to all mobile switching centers within the pool; or  The function device queries the normal mobile switching center information that sends the paging message, and routes the TMSI paging response message to the normal mobile switching center according to the queried normal mobile switching center information. [Claim 4] The method according to claim 3, wherein the function device queries the normal mobile exchange for sending the paging message)  The function device in the pool area obtains information about the mobile switching center that issues the paging message by querying all mobile switching centers in the pool area; or  The function device in the pool area obtains the information of the mobile switching center that delivers the paging message by querying the data backup center; or  The function device in the pool area obtains the mobile switching center information for delivering the paging message according to the configuration relationship.  [Claim 5] The method according to claim 3, wherein the method further comprises: after the function device in the pool area broadcasts the TMSI paging response message to all mobile switching centers in the pool area: Receiving, by the mobile switching center that sends the TMSI paging message, the TMSI paging response cancellation After the message, the TMSI paging response message is reserved, and the other mobile switching centers discard the TMSI paging response message. The method according to claim 1, wherein if the paging message is an international mobile subscriber identity IMSI paging message, and the paging response message is an IMSI paging response message, the method further includes: The function device in the pool area obtains the mobile switching center information that sends the IMSI paging message according to the recorded association relationship, and routes the IMSI paging response message to the mobile switching center, where the association relationship is An association relationship between the mobile switching center that sends the IMSI paging message and the IMSI paging message. The method according to claim 1, wherein the method further comprises: before forwarding, by the functional device in the pool area, the paging message delivered by the normal mobile switching center to the user: The data backup center sends a request for obtaining a roaming number to the normal mobile switching center; The request message includes a user identifier, or the request message includes a user identifier and user location information. The method according to claim 7, wherein the method further comprises: after routing the paging response message to the normal mobile switching center: Returning, by the normal mobile switching center, to the data backup center, a response message corresponding to the acquiring the roaming number request message, where the response message includes the mobile station roaming number information allocated by the normal mobile switching center to the user . A network fault 吋 user service splicing device, wherein the device includes a paging message forwarding module, configured to send a called service to a user belonging to a faulty mobile switching center in the pool area, and send the message to the normal mobile switching center. Forwarding the paging message to the user; a paging response message forwarding module, configured to acquire, by the user, a paging response message corresponding to the paging message forwarded by the paging message forwarding module, where the paging response message is sent In the case that the call response message is a Linyi Mobile Subscriber Identity TMSI Paging Response message, the TMSI Paging Response message is routed to the normal mobile switching center. The apparatus according to claim 9, wherein the paging response message forwarding module comprises: a paging response message receiving module, configured to receive the paging response message returned by the user, and trigger a searching module; a locating module, configured to broadcast, by the paging response message receiving module, the TMSI paging response message to all mobile switching centers in the pool area, or the query to deliver the normal movement of the paging message Exchange center information; The paging response message routing module is configured to route the paging response message received by the paging response message receiving module to the lookup module to find the determined normal mobile switching center. The device according to claim 10, wherein the searching module obtains the information of the mobile switching center that sends the TMSI paging message by querying all the mobile switching centers in the pool; or The searching module obtains the information of the mobile switching center that sends the TMSI paging message by querying the data backup center; or The searching module obtains the information of the mobile switching center that sends the TMSI paging message according to the configuration relationship; or And if the paging response message is an international mobile subscriber identity IMSI paging message, the searching module obtains the mobile switching center information that sends the IMSI paging message according to the recorded association relationship. The apparatus according to claim 9, 10 or 11, wherein said apparatus is a node having a non-access stratum node selection function NNSF. A network fault/user service connection system, wherein the system includes a mobile switching center, which is a normal mobile switching center, and is used to generate a called service in a user belonging to the faulty mobile switching center, instead of the faulty mobile switching center. Posting a page Message a function device in the pool area, configured to forward a paging message sent by the mobile switching center to the user, and receive a paging response message returned by the user, where the paging response message is a mobile subscriber identity In the case of a TMSI Paging Response message, the TMSI Paging Response message is routed to the normal mobile switching center.