CN101801053A - Method for removing local exchange, core network equipment and base station subsystem - Google Patents

Abstract

The invention discloses a method for releasing local switching, core network equipment and a base station subsystem. One of the methods includes: when receiving the first message requiring handover from the first base station subsystem, determining that the first call of the two calls after the handover will be located in the second base station subsystem, and assigning the core network to the two calls resources; sending a second message requesting handover to the second base station subsystem, the second message carrying the core network resources allocated for the first call in the two calls; receiving the second message from the second base station subsystem When the system returns the third message representing the confirmation of the handover request, it sends a fourth message indicating to perform the handover operation to the first base station subsystem, and the fourth message carries an instruction to cancel the local switching of the two calls information and allocated core network resource information. The method does not need to add an additional process of releasing the local exchange, and can save the execution time of the process and the number of messages of the A interface.

Description

Method for releasing local switching, core network equipment and base station subsystem

technical field

The invention relates to the technical field of wireless communication, in particular to a method for releasing local switching, core network equipment and a base station subsystem.

Background technique

The transmission network is an important part of the wireless communication network. At present, operators in many countries and regions are affected by the bottleneck of the transmission resources connecting the wireless access network and the core network, which affects the deployment, operation and business development of the wireless network. In regions such as Africa, wireless networks are growing much faster than wired networks. In regions represented by Europe, due to the restrictions of local laws and regulations, the construction of ground cable transmission networks cannot be constructed according to the needs of operators. Even countries with abundant terrestrial transmission resources, such as China, still face the problems of high cost and low return on investment when constructing transmission networks in remote areas and islands. In the above scenarios, operators usually use microwave, satellite or leased terrestrial transmission lines. Therefore, reducing the occupation of transmission network bandwidth can effectively reduce network construction and operation costs, and local switching is a method to effectively reduce transmission resource bandwidth.

The mobile communication system is mainly composed of a mobile station (MS, Mobile Station), a base station subsystem (BSS, Base Station Subsystem) and a network subsystem (Network Station Subsystem). The base transceiver station (BTS, Base Transceiver Station) and the base station controller (BSC, Base Station Controller) constitute the BSS. Mobile Switching Center (MSC, Mobile Switching Center) is located in NSS, which controls all BSC services, provides switching functions and connections with other functions in the system. Fig. 1 is a schematic diagram of the global mobile communication system in the prior art, MSC101 communicates with BSC102 through A interface, BSC102 communicates with BTS103 through Abis interface, BTS103 communicates with MS104 through Um interface.

Referring to Figure 1, for a session where the calling party and the called party are located in the same BSS, local switching can realize the loopback of the call link in the BSS, that is, the voice data of the user plane does not flow out of the BSS, so as to realize the specific interface transmission resources savings. Including the local exchange in the BSC and the local exchange in the BTS. Local switching within a BTS means that two calls are in the same BTS, or in the same BTS cluster (for the case of BTS cascading), and the loopback of the voice link occurs in the corresponding BTS, as shown in Figure 1. The voice link loopback of MS104-2 of MS104-1 occurs in BTS103-1, and the voice link loopback of MS104-3 and MS-104-4 occurs in the BTS103-2 cluster. By establishing local switching in the BTS, the transmission resources of the Abis interface and the A interface can be saved. For local switching within a BSC, the two parties in the conversation are located in the same BSC, but in different BTSs (BTS clusters), and the voice link loopback occurs in the corresponding BSC, as shown in Figure 1, MS104-5 and MS104- 6 voice link loopback occurs in BSC102-1. By establishing local switching in the BSC, the transmission resources of the A interface can be saved.

A method for releasing local switching in the prior art is: when the BSS where the two calls are located finds that a call must be handed over to another cell, the BSS needs to first propose to the MSC to release the local switching of the two calls, and the local switching is released. After success, the BSS initiates the handover process again.

During the research and practice of the prior art, the inventors of the present invention found that, in the above method, the local switching is released first, and then the switching is performed, so that the execution time of the process is longer, and the local switching process will increase the number of messages on the A interface. Moreover, the local switching has a certain impact on the call quality, and the subsequent handover also has a certain impact on the call quality. The superposition of the two adverse effects may seriously affect the call quality.

Contents of the invention

Embodiments of the present invention provide a method for releasing local switching, a core network device and a base station subsystem, which can release local switching while switching.

The embodiment of the present invention provides the following method for releasing local switching:

Method 1 to cancel the local exchange, including:

When receiving a first message requiring handover from the first base station subsystem, determining that the first call in the two calls after the handover will be located in the second base station subsystem, and allocating core network resources for the two calls;

sending a second message requesting handover to the second base station subsystem, where the second message carries core network resources allocated for the first call of the two calls;

When receiving the third message indicating the confirmation of the handover request returned from the second base station subsystem, sending a fourth message indicating to perform the handover operation to the first base station subsystem, the fourth message carrying the release of the two The instruction information of the local switching of a call and the allocated core network resource information.

The second method of canceling the local exchange includes:

receiving a seventh message from the core network side indicating to perform a handover operation, the seventh message carrying instruction information for releasing local switching of the two calls, and core network resource information allocated for the two calls;

According to the seventh message, the local switching of the two calls is released, the two calls are imported into the core network, and the first call of the two calls is switched from the first base station subsystem to the second base station subsystem system.

The third method to cancel the local exchange, including:

Receive a tenth message from the core network side instructing to perform a handover operation, the tenth message carrying instruction information for releasing the local switching of the two calls and the core network allocated for the second call among the two calls Internet resource information;

switching the first call of the two calls to the second base station subsystem according to the information carried in the tenth message;

When receiving the eleventh message from the core network side indicating to clear resources, release the local switching of the two calls, and import the second call to the core network.

The fourth method to cancel the local exchange includes:

receiving a thirteenth message requesting handover sent by the third base station subsystem, where the thirteenth message carries information about applying for cancellation of local switching;

When it is determined that the local switching of the two calls corresponding to the thirteenth message is allowed to be released, send a fourteenth message indicating to perform a handover operation to the third base station subsystem, and instruct the third base station subsystem to release the two calls local exchange.

The embodiment of the present invention also provides the following core network equipment:

Core network equipment 1, including:

The first receiving unit is configured to receive a message from the first base station subsystem, where the message includes a first message requiring handover;

a first judging unit, configured to judge the area after the switching of the two calls corresponding to the first message received by the first receiving unit;

The first resource management unit is used to manage core network resources, including: when the first judging unit judges that the first call of the two calls will be located in the second base station subsystem after the handover, for the two calls Call allocation of core network resources;

The first sending unit is configured to send a message to the second base station subsystem, including: a second message requesting handover, the second message carrying the first resource management unit as the first of the two calls Core network resources for call allocation;

The second receiving unit is configured to receive a message from the second base station subsystem, where the message includes a third message representing a handover request confirmation;

The second sending unit is configured to send a message to the first base station subsystem, where the message includes an instruction sent to the first base station subsystem to perform a handover operation when the second receiving unit receives the third message A fourth message, the fourth message carries indication information for canceling the local switching of the two calls and the allocated core network resource information.

Core network equipment two, including:

The fifth receiving unit is configured to receive a message sent from the third base station subsystem, where the message includes a seventh message requiring handover, and the seventh message carries information for applying to cancel local switching;

A second judging unit, configured to judge whether it is allowed to cancel the local switching of the two calls corresponding to the handover request message;

The fifth sending unit is configured to send a message to the third base station subsystem, where the message includes: when the second judging unit judges that the local switching of the two calls is allowed to be released, the sent instruction performs the handover operation The eighth message is used to instruct the third base station subsystem to cancel the local switching of the two calls.

The embodiment of the present invention also provides the following base station subsystem:

Base station subsystem 1, including:

The third receiving unit is configured to receive a message from the core network side, the message includes a tenth message indicating to perform a handover operation, the tenth message carries instruction information for canceling the local switching of the two calls, and is for all The core network resource information allocated by the above two calls;

The first local switching canceling unit is configured to cancel the local switching of the two calls according to the indication information of canceling the local switching of the two calls carried in the tenth message received by the third receiving unit;

a first importing unit, configured to import the two calls into the core network according to the core network resources allocated for the two calls carried in the tenth message received by the third receiving unit;

The first switching unit is configured to switch the first call of the two calls from the first base station subsystem to the second base station subsystem according to the tenth message received by the third receiving unit.

Base station subsystem two, including:

The fourth receiving unit is configured to receive a message from the core network side, including a thirteenth message indicating to perform a handover operation and a fourteenth message indicating to clear resources, and the thirteenth message carries local information for releasing two calls. exchanged indication information and core network resource information allocated for the second call of the two calls;

The second switching unit is configured to switch the first call of the two calls from the first base station subsystem to the second base station subsystem according to the information carried in the thirteenth message received by the fourth receiving unit;

The second local switching release unit is configured to release the local switching of the two calls when the fourth receiving unit receives the fourteenth message;

The second importing unit is configured to import the second call into the core network when the fourth receiving unit receives the fourteenth message.

Base station subsystem three, including:

The sixth receiving unit is configured to receive a message from the core network side, the message includes a seventeenth message indicating to perform a handover operation, and the seventeenth message carries instruction information for canceling local switching of two calls, and Core network resource information allocated for the two calls;

The third local switching canceling unit is configured to cancel the local switching of the two calls according to the indication information of canceling the local switching of the two calls carried in the seventeenth message received by the sixth receiving unit;

a third importing unit, configured to import the two calls into the core network according to the core network resources allocated for the two calls carried in the seventeenth message received by the sixth receiving unit;

The third switching unit is configured to switch the first call of the two calls from the first cell to the second cell according to the receipt of the seventeenth message by the sixth unit.

In a technical solution of an embodiment of the present invention, when receiving a handover request message from the first base station subsystem and determining that the first call of the two calls after switching will be located in the second base station subsystem, the two allocate core network resources for each call; and send a switch request message to the second base station subsystem, the switch request message carries the core network resources allocated for the first call in the two calls, and upon receiving When the message indicating the confirmation of the handover request is returned from the second base station subsystem, a message indicating to perform the handover operation is sent to the first base station subsystem, and the message indicating to perform the handover operation carries the message of releasing the two calls The indication information of the local switching and the allocated core network resource information, so that the first base station subsystem can release the local switching of the two calls, and switch the first call to the second base station subsystem. It can be seen that the method for canceling the local switching does not need to add an additional process for canceling the local switching, and the local switching is canceled at the same time of switching, so the execution time of the process can be saved, and the number of messages of the A interface can be saved. Moreover, since there is no need for a separate process to cancel the local switching, the call quality will not be adversely affected by the cancellation of the local switching, thereby improving user experience.

In another technical solution of the embodiment of the present invention, when receiving a handover request message sent by the third base station subsystem, when the handover request message carries the information of applying for cancellation of local switching, it is judged whether to allow the cancellation Local switching of the two calls corresponding to the message requiring handover, and when allowed, send a message indicating to perform a handover operation to the third base station subsystem, instructing the third base station subsystem to release the local switching of the two calls exchange. It can also be seen that the method for canceling the local switching does not need to add an additional process for canceling the local switching, and cancels the local switching at the same time as switching, so the execution time of the process can be saved, and the number of messages of the A interface can be saved. Moreover, since there is no need for a separate process to cancel the local switching, the call quality will not be adversely affected by the cancellation of the local switching, thereby improving user experience.

Description of drawings

Fig. 1 is a schematic diagram of the global mobile communication system in the prior art;

FIG. 2 is a flow chart of a method for releasing local switching in an embodiment of the present invention;

FIG. 3 is a signaling flow chart of Embodiment 1 of Method 1 for canceling local switching in the embodiment of the present invention;

4A-C are schematic diagrams of resource allocation during handover in Embodiment 1 of Method 1 for releasing local switching in the embodiment of the present invention;

FIG. 5 is a signaling flow chart of Embodiment 2 of Method 1 for canceling local switching in the embodiment of the present invention;

6A-C are schematic diagrams of resource allocation during handover in Embodiment 2 of Method 1 for releasing local switching in the embodiment of the present invention;

FIG. 7 is a flow chart of a second method for releasing local switching in an embodiment of the present invention;

FIG. 8 is a signaling flowchart of an embodiment of the second method for releasing local switching in the embodiment of the present invention;

Fig. 9 is a schematic structural diagram of MSC embodiment 1 in the embodiment of the present invention;

Fig. 10 is a schematic structural diagram of MSC embodiment 2 in the embodiment of the present invention;

Fig. 11 is a schematic structural diagram of the third embodiment of MSC in the embodiment of the present invention;

Fig. 12 is a schematic structural diagram of BSS embodiment 1 in the embodiment of the present invention;

Fig. 13 is a schematic structural diagram of the second embodiment of the BSS in the embodiment of the present invention;

Fig. 14 is a schematic structural diagram of the third embodiment of the BSS in the embodiment of the present invention;

Fig. 15 is a schematic structural diagram of the fourth embodiment of the BSS in the embodiment of the present invention;

Fig. 16 is a schematic structural diagram of the fifth embodiment of the BSS in the embodiment of the present invention;

Fig. 17 is a schematic structural diagram of the sixth embodiment of the BSS in the embodiment of the present invention.

Detailed ways

Embodiments of the present invention provide a method for releasing local switching, a core network device, and a base station subsystem, which can realize releasing local switching during handover, which will be described in detail below.

Handover means that when the mobile station in the call enters another cell from one cell, the network can switch the mobile station from the channel used by the original cell to a certain channel in the new cell, so as to ensure that the user's call is not interrupted. Handover includes handover between cells in different BSS control areas (Inter-BSS) and handover between different cells in the same BSS control area (Intra-BSS). local exchange. The corresponding ones are called Inter-BSS Handover Release Local Switching and Intra-BSS Handover Release Local Switching, which will be described in detail below.

Method 1. Inter-BSS handover cancels local switching:

Referring to Fig. 2, it is a flowchart of a method for releasing local switching in an embodiment of the present invention, and the specific steps are as follows:

S201. Receive a first message requiring handover from a first base station subsystem;

S202. Judging that the first call among the two calls after the handover will be located in the second base station subsystem, and allocating core network resources for the two calls;

S203. Send a second message requesting handover to the second base station subsystem, where the second message carries core network resources allocated for the first call of the two calls;

S204. Receive a third message indicating a handover request confirmation returned from the second base station subsystem;

S205. Send a fourth message indicating to perform a handover operation to the first base station subsystem, where the fourth message carries instruction information for releasing the local switching of the two calls and allocated core network resource information, so that The first base station subsystem releases the local switching of the two calls, and switches the first call to the second base station subsystem.

It can be seen that, in the embodiment of the present invention, the process of releasing the local switching is performed simultaneously with the switching process, and since there is no need to add a separate process of releasing the local switching, the execution time of the entire process can be reduced. In addition, because the message in the handover process is used to transmit the information required to release the local switching, the number of messages on the A interface can be reduced. Moreover, the process of releasing the local switching and the handover process are carried out simultaneously, which can also avoid the impact of the superposition of unfavorable factors generated when the two processes are executed separately on the call quality, thereby improving user experience.

For the convenience of description, the description methods such as first message and second message are used in this application document. It can be understood that the first message and second message are only used to distinguish different messages, and are not used to indicate the function or order.

In order to enable those skilled in the art to better understand and implement the embodiments of the present invention, the following describes in detail through specific application scenarios with reference to the accompanying drawings.

Embodiment 1. For the convenience of description, it is assumed that terminals MS1 and MS2 are involved in the handover process. Before the handover, both MS1 and MS2 are located at BSS1; after the handover, MS1 is located at BSS2, and MS2 is still located at BSS1.

Referring to Fig. 3, it is a signaling flowchart of embodiment 1 of method 1 for releasing local switching in the embodiment of the present invention, and the specific steps are as follows:

S301, BSS1 sends to MSC the handover requirement (Handover Required) message that represents to require handover;

The BSS1 can send the Handover Required message to the MSC through the SCCP (Signal Connection Control Part) connection of the MS1. According to different application scenarios, the Handover Required message may carry the relevant resources allocated by BSS1 for calls corresponding to MS1 and MS2, so as to realize the connection with resources allocated by MSC. For example, when the user plane IP of the A interface is carried, BSS1 allocates the IP endpoint on the BSS1 side for the two calls, and informs the MSC through a Handover Required message.

For each call under the same MSC, some identification means may be used to uniquely identify it. For example, an information element of a call identification (Call-ID) may be used for identification. In addition to the Call-ID, other methods may also be used, and the methods mentioned in this application document do not constitute a limitation thereto.

S302. After the MSC judges the handover, the two calls corresponding to MS1 and MS2 will be located in different BSSs, and the MSC allocates 3 core network resources for the two calls: CR1, CR2 and CR1', where: CR1 and CR2 are used for BSS1 Import the calls of MS1 and MS2 into the core network; CR1' is used by BSS2 to import the calls of MS1 into the core network; and send a handover request (Handover Request) message to BSS2 indicating a request for handover, and the Handover Request message carries the information allocated by the MSC. CR1' core network resource information;

The MSC can determine which calls need to release the local switching. For example, the MSC can determine whether it is necessary to release the two calls of the session by recording the cell IDs (Cell-ID) of the cell where the two calls that constitute the session are located, combined with the codec used by the two calls and the current supplementary service requirements. local exchange. For example, the MSC can judge whether the two calls forming a session need to release the local switching according to the following aspects:

1) When the two calls need to be located in different BSSs, the local switching needs to be released.

2) When the codecs of the two calls change and become different or incompatible, the local switching needs to be released.

3) For the supplementary service, when the attribute of the call service changes and conflicts with the local exchange, the local exchange needs to be released. For example, the attributes of supplementary services such as call waiting, call hold, and multi-party conversation conflict with local switching, and local switching cannot be performed and must be released.

The BSC can also determine that the two calls are located in different BSCs. At this time, the BSC can indicate in the handover request message that the two calls are to be released from local switching.

S303, BSS2 returns to MSC the handover request confirmation (Handover Request Ack) message that represents handover request confirmation;

S304, MSC sends to BSS1 a handover command (Handover Command) message indicating to perform a handover operation, and the Handover Command message carries the core network resource CR1 allocated by MSC for the call of MS1 and the core network resource CR2 resource allocated for the call of MS2 information, and instruction information for releasing the local switching of the two calls;

The MSC can use the SCCP connection of MS1 to send a Handover Command message to BSS1.

When receiving the Handover Command message from MSC, BSS1 will terminate the local switching, import the two calls into the core network, and then BSS1 will switch MS1 to BSS2. During the handover process, MSC can send and receive voice data from MS1 through CR1 and CR1' at the same time.

S305, BSS2 send handover detection (Handover Detect) message to MSC;

BSS2 detects the legitimacy of MS1, if it is legal, then MS1 handover is successful, BSS2 utilizes CR1' to import the call of MS1 into the core network, and executes S306.

S306, BBS2 sends the handover complete (Handover Complete) message that indication handover is completed to MSC;

S307, MSC sends to BSS1 the clear command (Clear Command) message that clears resources and clears the resources occupied in BSS1 when MS1 is handed over;

After MSC receives the Handover Complete message, it clears the resources occupied by MS1 during handover, including CR1, etc., and at the same time, MSC sends a Clear Command message to BSS1. When BSS1 receives the Clear Command message, it clears the relevant resources of MS1 in BSS1. Including air interface resources.

S308. The BSS1 sends a clear complete (Clear Complete) message to the MSC indicating the completion of resource clearing.

After the resources occupied by BSS1 are released during MS1 handover, BSS1 sends a Clear Complete message to MSC.

The above is the flow of the method for canceling the local switching during Inter-BSS handover. The resource allocation situation before the handover, during the handover process and after the handover is explained below with reference to the accompanying drawings: With reference to FIG. Schematic diagram of call resource allocation. MS1 and MS2 perform local switching through BSS1 and occupy resources in BSS1. Referring to FIG. 4B , it is a schematic diagram of the resource allocation of the two calls in the handover process in this embodiment. MSC can send and receive voice data from MS1 through core network resources CR1 and CR1' at the same time. At the same time, MSC is MS1 to be handed over to BSS2 Reserved core network resource CR1'. Referring to FIG. 4C , it is a schematic diagram of the resource allocation of the two calls after the handover in this embodiment. The core network resource CR1 used by MS1 in the handover process has been cleared, and the MSC uses the core network resource CR2, resources in BSS1 and air interface resources from The MS2 acquires the voice data, and acquires the voice data from the MS1 through the core network resource CR1', resources in the BSS2, and air interface resources.

It can be understood that, in specific implementation, the foregoing embodiment can be further optimized. For example,

When BSS1 cannot release the local switching or cannot import the two calls into the core network, BSS1 will not send a Handover Command message to MS1, but send a handover failure (Handover Failure) message indicating handover failure to MSC, in the Handover Failure message May indicate local switching failure. For example, the reason value in the Handover Failure message can be set to: Fail to release local switch. When the MSC receives the Handover Failure message, it terminates the handover process and clears the core network resources allocated for the two calls. In this way, the two calls will continue to perform local switching as if the handover never took place.

If MS1 fails to switch to BSS2 and falls back to BSS1, BSS1 still imports the two calls into the core network, and sends a Handover Failure message to MSC to indicate the cause of failure. For example, the reason value in the Handover Failure message can be set to: wireless Interface failure, modify back to the original channel (Radio interface failure, revision to old channel). After receiving the handover failure message sent by BSS1, the MSC clears the core network resources allocated for the two calls, and executes the existing handover failure processing procedure, which will not be described in detail.

In the second embodiment, for the convenience of description, it is assumed that terminals MS1 and MS2 are involved in the handover process. Before the handover, both MS1 and MS2 are located in BSS1; after the handover, MS1 is located in BSS2, and MS2 is still located in BSS1. Similar to Embodiment 1, when the MSC receives the Handover Required message and finds that the calls corresponding to MS1 and MS2 will be located in different BSSs after the handover, the local switching must be released. The difference is that during the switching process, the local switching of the two calls is maintained, and after the switching is completed, the local switching of the two calls is released.

Referring to FIG. 5 , it is a signaling flowchart of Embodiment 2 of Method 1 for releasing local switching in the embodiment of the present invention, and the specific steps are as follows:

S501, BSS1 sends handover requirement (Handover Required) message to MSC;

BSS1 can send a Handover Required message to MSC through the SCCP (Signal Connection Control Protocol) connection of MS1. According to different application scenarios, the Handover Required message may carry the relevant resources allocated by BSS1 for calls corresponding to MS1 and MS2, so as to realize the connection with resources allocated by MSC. For example, when the user plane IP of the A interface is carried, BSS1 allocates the IP endpoint (including IP address and port number) on the BSS1 side for the two calls, and informs the MSC through a Handover Required message.

For each call under the same MSC, some identification means may be used to uniquely identify it. For example, an information element of a call identification (Call-ID) may be used for identification. In addition to the Call-ID, other methods may also be used, and the methods mentioned in this application document do not constitute a limitation thereto.

S502. After the MSC judges the handover, the two calls corresponding to MS1 and MS2 will be located in different BSSs, and the MSC allocates two core network resources for the two calls: CR1 and CR2, wherein: CR2 is used for BSS1 to import the call of MS2 Core network, CR1 is used for BSS2 to import the call of MS1 into the core network; and sends a handover request (Handover Request) message to BSS2, and the Handover Request message carries the CR1 core network resource information allocated by MSC;

The MSC can determine which calls need to release the local switching. For details, refer to the judgment method introduced in Embodiment 1 of Method 1, and details are not repeated here.

S503, BSS2 returns handover request confirmation (Handover Request Ack) message to MSC;

S504, the MSC sends a handover command (Handover Command) message to BSS1, the Handover Command message carries the core network resource CR2 resource information allocated by the MSC for the call of MS2, and the instruction information for releasing the local switching of the two calls;

The MSC can use the SCCP connection of MS1 to send a Handover Command message to BSS1.

When receiving the Handover Command message from MSC, BSS1 will maintain local switching, and at the same time, BSS1 will cut out MS1.

S505, BSS2 send handover detection (Handover Detect) message to MSC;

BSS2 checks the legitimacy of MS1, if it is legal, MS1 handover is successful, BSS2 immediately uses the core network resource CR1 to import the call of MS1 into the core network, and executes S506.

S506, BBS2 send handover completion (Handover Complete) message to MSC;

S507, MSC sends clear command (Clear Command) message to BSS1 and removes the resources occupied in BSS1 when MS1 switches;

After receiving the Handover Complete message, the MSC uses the Clear Command message to clear the resources occupied by MS1 in BSS1, including air interface resources. After receiving the Clear Command message, BSS1 releases the local switching of the two calls, and imports the call of MS2 into the core network.

S508. The BSS1 sends a clear complete (Clear Complete) message to the MSC.

After the resources occupied by BSS1 are released during MS1 handover, BSS1 sends a Clear Complete message to MSC.

The above is the flow of the method for canceling the local switching during Inter-BSS handover. The resource allocation situation before, during, and after the handover is explained with reference to the accompanying drawings: With reference to FIG. Schematic diagram of call resource allocation. MS1 and MS2 perform local switching through BSS1 and occupy resources in BSS1. Referring to FIG. 6B , it is a schematic diagram of the resource allocation of the two calls in the handover process in this embodiment. MS1 and MS2 are still talking through local switching. At the same time, MSC reserves the core network resource CR1 for MS1 to be handed over to BSS2. The core network resource CR2 is reserved for MS2. Referring to FIG. 4C , it is a schematic diagram of resource allocation of the two calls after handover in this embodiment. The resources in BSS1 used in the local switching process have been cleared, and the MSC uses core network resources CR2, resources in BSS1 and air interface resources from MS2 obtains the voice data, and obtains the voice data from MS1 through core network resources CR1, resources in BSS2, and air interface resources.

It can be understood that, in specific implementation, the foregoing embodiment can be further optimized. For example,

When BSS1 cannot release the local switching or cannot import the two calls into the core network, BSS1 will not send a Handover Command message to MS1, but send a handover failure (Handover Failure) message to MSC, and the Handover Failure message can indicate the failure of the handover Reason: Failed to unwind local swap. When the MSC receives the Handover Failure message, it terminates the handover process and clears the core network resources allocated for the two calls. In this way, the two calls will continue to perform local switching as if the handover never took place.

And if MS1 cannot be handed over to BSS2, when falling back to BSS1, BSS1 still imports the two calls into the core network, and sends a Handover Failure message to MSC to indicate the reason for the handover failure. For example, the reason value in the Handover Failure message can be set to: Radio interface failure, modify back to the original channel (Radio interface failure, revision to old channel). After receiving the handover failure message sent by BSS1, the MSC clears the core network resources allocated for the two calls, and executes the existing handover failure processing procedure, which will not be described in detail.

Method 2: Intra-BSS handover cancels local switching:

Referring to FIG. 7, it is a flow chart of the second method for releasing local switching in the embodiment of the present invention, and the specific steps are as follows:

S701. Receive a thirteenth message requesting handover sent by the third base station subsystem, where the thirteenth message carries information about applying for cancellation of local switching;

S702. When it is determined that the local switching of the two calls corresponding to the thirteenth message is allowed to be released, send a fourteenth message indicating to perform a handover operation to the third base station subsystem, and instruct the third base station subsystem to release the two calls. Local switching of calls.

It can be seen that, in the embodiment of the present invention, the process of canceling the local switching is performed simultaneously with the switching process. Since there is no need to add a separate process of canceling the local switching, the execution time of the whole process can be reduced. In addition, because the message in the handover process is used to transmit the information required to release the local switching, the number of messages on the A interface can be reduced. Moreover, the process of releasing the local switching and the handover process are carried out simultaneously, which can also avoid the impact of the superposition of unfavorable factors generated when the two processes are executed separately on the call quality, thereby improving user experience.

In order to enable those skilled in the art to better understand and realize the present invention, the following describes in detail with reference to the accompanying drawings through specific embodiments:

Referring to Fig. 8, it is the embodiment signaling flowchart of the method 2 of releasing local switching in the embodiment of the present invention, in the handover process, cancel the local switching of two calls (set as the call of MS1 and the call of MS2) in BSS3 ,Specific steps are as follows:

S801, BSS3 sends to MSC the internal handover requirement (Internal Handover Required) message that requires handover, and the message carries the information that applies for canceling local exchange;

In some scenarios, such as the scenario where the bearer mode of the user plane of the A interface is IP, the Internal Handover Required message should also include the related resources allocated by BSS3 for the two calls, and the related resources include the two IP addresses on the BSS3 side. Endpoint (including IP address and IP port number).

S802, when the MSC judges that the local switching of the two calls is allowed after the handover is allowed, it sends an internal handover command (Internal Handover Command) message to BSS3 indicating that the internal handover is performed, and the message carries the indication information (for example, that the local switching is released) , carrying the cell release Local Switch Indication (Release Local Switch Indication), used to instruct BSS3 to release the local switching of the two calls;

In the Internal Handover Command message, in addition to the information element for releasing the local switching of the two calls, it may also include core network resource information allocated for the two calls.

S803, BSS3 releases the local switching of the two calls, imports the two calls into the core network, and at the same time, BSS3 executes a handover operation, and sends a handover complete (Handover Complete) message indicating handover completion to the MSC.

The Handover Complete message may carry release local switch result (Release Local Switch Result) information.

It can be seen that in this embodiment, by transmitting the message of releasing the local exchange during the handover process, the handover process and the process of releasing the local exchange are avoided to be executed separately, so the total process execution time can be saved, and the number of messages on the A interface can be reduced. The adverse effect on the call quality caused by the handover process and the release of the local switching process is avoided, so the call quality can be improved.

In specific implementation, the above-mentioned embodiment can be further optimized. For example, after step S802 is executed, if BSS3 fails to release the local switch or fails to import the two calls into the core network, the handover process is terminated. At this time, BSS3 may send a handover failure (Handover Failure) message to the MSC, and the message carries an information element indicating that the local switching fails. For example: the reason value in the Handover Failure message can be set to: release local switch failed (Release local switch failed) to inform the MSC of the handover failure. When the MSC receives the Handover Failure message carrying the cause value of Release local switch failed, it may clear the core network resources allocated for the two calls.

And after step S801 is executed, if the MSC does not allow the local switching of the two calls to be released, an Internal Handover Required Reject (Internal Handover Required Reject) message can be sent to BSS3 to indicate that the handover request is rejected, and information is carried in the message The meta directive does not allow unwinding of local swaps. For example, the reason value in the Internal Handover Required Reject message can be set to: Nor allowed to Release local switch.

It can be understood that the embodiments cited in this application document are not intended to limit the present invention. For example, the above-mentioned message composition is not limited to the message used in the release of the local switching process, and the message composition (including the cell structure) can be implemented in the information Flexible definition on a transitive basis.

The method for releasing local switching in the embodiment of the present invention has been described above in detail. To enable those skilled in the art to better understand and implement the present invention, the MSC and BSS in the embodiment of the present invention are described below with reference to the accompanying drawings.

Referring to Figure 9, it is a schematic structural diagram of MSC embodiment 1 in the embodiment of the present invention, MSC900 includes:

The first receiving unit 901 is configured to receive a message from the first base station subsystem, where the message includes a first message requiring handover;

The first judging unit 902 is configured to judge the area after the switching of the two calls corresponding to the first message received by the first receiving unit 901;

The first resource management unit 903 is configured to manage core network resources, including: when the first judging unit 902 judges that the first call of the two calls will be located in the second base station subsystem after the handover, for the Two calls allocate core network resources;

The first sending unit 904 is configured to send a message to the second base station subsystem, including: a second message requesting handover, the second message carrying the information that the first resource management unit 903 is the caller of the two calls Core network resources allocated for the first call;

The second receiving unit 905 is configured to receive a message from the second base station subsystem, where the message includes a third message representing a handover request confirmation;

The second sending unit 906 is configured to send a message to the first base station subsystem, where the message includes an instruction to be sent to the first base station subsystem when the second receiving unit 905 receives the third message. The fourth message of the handover operation, the fourth message carries the indication information of releasing the local switching of the two calls and the allocated core network resource information, so that the first base station subsystem releases the two calls local switching of the local switch, and handover the first call to the second base station subsystem.

It can be seen that the MSC introduced in this embodiment can issue information instructing to cancel the local switching during the handover process, without adding an additional process for canceling the local switching, and canceling the local switching at the same time as the handover, so the execution time of the process can be saved. And save the number of messages on the A interface. Moreover, since there is no need for a separate process to cancel the local switching, the call quality will not be adversely affected by the cancellation of the local switching, thereby improving user experience.

For each call under the same MSC, some identification means may be used to uniquely identify it. For example, an information element of a call identification (Call-ID) may be used for identification. In addition to the Call-ID, other methods may also be used, and the methods mentioned in this application document do not constitute a limitation thereto.

In a specific implementation, the message received by the first receiving unit 901 may also include a fifth message indicating the completion of the handover from the first base station subsystem; correspondingly, the first resource management unit 903 may also be used to When unit 901 receives the fifth message, it clears resources occupied by the first call handover, including core network resources and resources occupied in the first base station subsystem, thereby saving transmission resources.

In a specific implementation, the message received by the first receiving unit 901 from the first base station subsystem may also include a sixth message indicating handover failure, and the sixth message carries the local switching failure of releasing the two calls. Correspondingly, the first resource management unit 903 is further configured to clear the core network resources allocated for the two calls when the first receiving unit 901 receives the sixth message. Therefore, core network resources, including A interface resources, can be saved.

Referring to Figure 10, it is a schematic structural diagram of MSC embodiment 2 in the embodiment of the present invention, MSC1000 includes:

The fifth receiving unit 1001 is configured to receive a message sent from the third base station subsystem, the message includes a seventh message requiring handover, and the seventh message carries information for applying to cancel local switching;

The second judging unit 1002 is configured to judge whether it is allowed to cancel the local switching of the two calls corresponding to the handover request message;

The fifth sending unit 1003 is configured to send a message to the third base station subsystem, where the message includes: when the second judging unit 1002 judges that the local switching of the two calls is allowed to be released, the sent instruction executes the handover The eighth message of the operation is used to instruct the third base station subsystem to cancel the local switching of the two calls.

It can be seen that the MSC introduced in this embodiment can perform the process of releasing the local switching and the switching process at the same time, without adding a separate process of releasing the local switching, so the execution time of the whole process can be reduced. In addition, because the message in the handover process is used to transmit the information required to release the local switching, the number of messages on the A interface can be reduced. Moreover, the process of releasing the local switching and the handover process are carried out simultaneously, which can also avoid the impact of the superposition of unfavorable factors generated when the two processes are executed separately on the call quality, thereby improving user experience.

In a specific implementation, the seventh message sent by the fifth sending unit 1001 may also carry core network resource information allocated for the two calls, so that the third base station subsystem can import the two calls into Core Network.

Referring to FIG. 11 , it is a schematic structural diagram of MSC Embodiment 3 in the embodiment of the present invention, which is extended on the basis of MSC Embodiment 2. The difference between MSC1100 and MSC1000 is that MSC1100 also includes a third resource management unit 1101. In MSC1100:

The message received by the fifth receiving unit 1001 may also include: an eighth message indicating that the switching of the two calls is completed, or a ninth message indicating that the switching of the two calls has failed, and the ninth message carries a release information that the local exchange of the two calls failed;

The third resource management unit 1101 is configured to, when the fifth receiving unit 1001 receives the eighth message indicating that the handover of the two calls is completed, clear the resources of the third base station subsystem occupied by the two calls during the handover ; or clear the core network resources allocated for the two calls when the fifth receiving unit 1001 receives the ninth message indicating that the handover of the two calls fails.

In a specific implementation, the message sent by the fifth sending unit 1001 may also include: when the second judging unit 1002 judges that it is not allowed to cancel the local switching of the two calls corresponding to the seventh message, send the message to the third base station subsystem A ninth message for rejecting the handover request is sent, where the ninth message carries indication information that local switching is not allowed to be released.

Referring to Figure 12, it is a schematic structural diagram of BSS Embodiment 1 in the embodiment of the present invention, BSS1200 includes:

The third receiving unit 1201 is configured to receive a message from the core network side, the message includes a tenth message indicating to perform a handover operation, the tenth message carries instruction information for canceling local switching of two calls, and is Core network resource information allocated by the two calls;

The first local switching canceling unit 1202 is configured to cancel the local switching of the two calls according to the instruction information for canceling the local switching of the two calls carried in the tenth message received by the third receiving unit 1201;

The first importing unit 1203 is configured to import the two calls into the core network according to the core network resources allocated for the two calls carried in the tenth message received by the third receiving unit 1201;

The first switching unit 1204 is configured to, according to the tenth message received by the third receiving unit 1201, switch the first call of the two calls from the first base station subsystem to the second base station subsystem.

It can be seen that the interaction between the BSS and the core network equipment MSC can make the process of releasing the local switching and the handover process proceed simultaneously, and since there is no need to add a separate process of releasing the local switching, the execution time of the entire process can be reduced. In addition, because the message in the handover process is used to transmit the information required to release the local switching, the number of messages on the A interface can be reduced. Moreover, the process of releasing the local switching and the handover process are carried out simultaneously, which can also avoid the impact of the superposition of unfavorable factors generated when the two processes are executed separately on the call quality, thereby improving user experience.

Referring to FIG. 13 , it is a schematic diagram of the structure of the BSS embodiment 2 in the embodiment of the present invention. On the basis of the BSS embodiment 1, the BSS 1300 can expand the third sending unit 1301 for transmitting to the core network side when the switching by the first switching unit 1204 is completed. Sending a message, where the message includes an eleventh message indicating that the handover is completed, so that the core network side clears the resources occupied by the first call in the first base station subsystem.

In a specific implementation, the message sent by the third sending unit 1301 to the core network side may also include: when the local switching of the two calls cannot be canceled or the two calls cannot be imported into the core network, send the message to the core network side The twelfth message indicating the handover failure, the twelfth message carries the information of releasing the local switching failure of the two calls, so that the core network side clears the core network resources allocated for the two calls.

In a specific implementation, the message sent by the third sending unit 1301 to the core network side may also include: when the first call cannot be handed over to the second base station subsystem, the twelfth message indicating the handover failure sent to the core network side message, the twelfth message carries the information that the wireless interface fails, and the original channel is modified, so that the core network side clears the core network resources allocated for the two calls; correspondingly, the first importing unit 1203 can also be used to When the first call cannot be switched to the second base station subsystem, the two calls are imported into the core network.

Referring to Figure 14, it is a schematic structural diagram of the third embodiment of the BSS in the embodiment of the present invention, and the BSS1400 includes:

The fourth receiving unit 1401 is configured to receive messages from the core network side, including a thirteenth message indicating to perform a handover operation and a fourteenth message indicating to clear resources, and the thirteenth message carries information about releasing two calls Indication information of local switching and core network resource information allocated for the second call in the two calls;

The second switching unit 1402 is configured to switch the first call of the two calls from the first base station subsystem to the second base station subsystem according to the information carried in the thirteenth message received by the fourth receiving unit 1401 ;

The second local switching canceling unit 1403 is configured to cancel the local switching of the two calls when the fourth receiving unit 1401 receives the fourteenth message;

The second importing unit 1404 is configured to import the second call into the core network when the fourth receiving unit 1401 receives the fourteenth message.

It can be seen that the interaction between the BSS and the core network equipment MSC can make the process of releasing the local switching and the handover process proceed simultaneously, and since there is no need to add a separate process of releasing the local switching, the execution time of the entire process can be reduced. In addition, because the message in the handover process is used to transmit the information required to release the local switching, the number of messages on the A interface can be reduced. Moreover, the process of releasing the local switching and the handover process are carried out simultaneously, which can also avoid the impact of the superposition of unfavorable factors generated when the two processes are executed separately on the call quality, thereby improving user experience.

Referring to FIG. 15 , it is a schematic structural diagram of the fourth embodiment of the BSS in the embodiment of the present invention. On the basis of the third embodiment of the BSS, the second resource management unit 1501 is extended to import the second call into the core network at the second importing unit 1404 After that, the resource of the first base station subsystem occupied by the second call is cleared.

On the basis of BSS Embodiment 3 or 4, further extensions can be made to explain on the basis of BSS Embodiment 4. Referring to Figure 16, it is a schematic diagram of the structure of BSS Embodiment 5 in the embodiment of the present invention. BSS1600 in BSS Embodiment On the fourth basis, the fourth sending unit 1601 is extended to send a message to the core network, and the message includes: when the first call cannot be imported into the core network or the local switching of the two calls cannot be released, send the message to the core network The sixteenth message indicating handover failure sent by the network side, so that the core network side clears the core network resources allocated for the two calls, and the two calls continue to perform local switching; or, when the first call cannot When switching to the second base station subsystem, and sending to the core network side a sixteenth message indicating that the switch fails, the sixteenth message carries the information that the wireless interface fails and the original channel is modified, so that the core network side clears the Core network resources allocated for the two calls.

Referring to Figure 17, it is a schematic structural diagram of the sixth embodiment of the BSS in the embodiment of the present invention, and the BSS1700 includes:

The sixth receiving unit 1701 is configured to receive a message from the core network side, the message includes a seventeenth message indicating to perform a handover operation, and the seventeenth message carries instruction information for canceling local switching of two calls, and core network resource information allocated for the two calls;

The third local switching canceling unit 1702 is configured to cancel the local switching of the two calls according to the indication information of canceling the local switching of the two calls carried in the seventeenth message received by the sixth receiving unit 1701;

The third importing unit 1703 is configured to import the two calls into the core network according to the core network resources allocated for the two calls carried in the seventeenth message received by the sixth receiving unit 1701;

The third switching unit 1704 is configured to switch the first call of the two calls from the first cell to the second cell according to the receipt of the seventeenth message by the sixth unit.

It can be seen that the BSS introduced in this embodiment cooperates with the core network device MSC to release the local switching during handover, thus saving the execution time of the process and the number of messages on the A interface. Moreover, since there is no need for a separate process to cancel the local switching, the call quality will not be adversely affected by the cancellation of the local switching, thereby improving user experience.

For specific applications in the above MSC and BSS devices, refer to the application scenario of the embodiment of the method for releasing local switching, and details are not repeated here.

The specific application in the Global System for Mobile Communications (GSM, Global System for Mobile Communications) has been described in detail above. It can be understood that the method for establishing local switching introduced in the embodiment of the present invention can also be applied to wideband code division multiple Address (WCDMA, Wideband Code Division Multiple Access), Time Division Synchronous Code Division Multiple Access (TD-SCDMA, Time Division Synchronous Code Division Multiple Access) and long-term evolution network (LTE, Long Term Evolution) and other wireless communication systems, and all The corresponding equipment is the corresponding core network equipment (such as MSC server) and base station subsystem (including radio network controller (RNC (Radio Network Controller) and base station (NodeB)) in the system. No more examples will be given.

It can be understood that the attributives used in the embodiments of the present invention such as first and second to define systems, devices or units do not indicate a certain order, but are used for the convenience of description and to distinguish different systems, devices or units. It is sufficient as long as the system, device or unit can realize the functions of the embodiments of the present invention.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM, RAM, disk or CD, etc.

The method for releasing local switching provided by the embodiment of the present invention, the core network equipment, and the base station subsystem are described above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiment is only It is used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, this The content of the description should not be construed as limiting the present invention.

Claims (29)

1. A method for releasing local exchange, characterized in that, comprising: When receiving a first message requiring handover from the first base station subsystem, determining that the first call in the two calls after the handover will be located in the second base station subsystem, and allocating core network resources for the two calls; sending a second message requesting handover to the second base station subsystem, where the second message carries core network resources allocated for the first call of the two calls; When receiving the third message indicating the confirmation of the handover request returned from the second base station subsystem, sending a fourth message indicating to perform the handover operation to the first base station subsystem, the fourth message carrying the release of the two The instruction information of the local switching of a call and the allocated core network resource information. 2. The method for releasing local exchange as claimed in claim 1, characterized in that, The allocating core network resources for the two calls includes: allocating three core network resources for the two calls, wherein the first core network resources and the second core network resources are used by the first base station subsystem to transfer the first The call and the second call are imported into the core network, and the third core network resource is used for the second base station subsystem to import the first call into the second base station subsystem; The fourth message sent to the first base station subsystem carries: instruction information for canceling the local switching of the two calls and information about the allocated resources of the first core network and resources of the second core network. 3. The method for releasing local switching as claimed in claim 1, characterized in that, The allocating core network resources for the two calls includes: allocating two core network resources for the two calls, wherein the first core network resources are used by the second base station subsystem to import the first call into the core network , the second core network resource is used for the first base station subsystem to import the second call into the core network; The fourth message sent to the first base station subsystem carries: instruction information for releasing the local switching of the two calls and core network resource information allocated for the second call. 4. The method for releasing local switching according to any one of claims 1 to 3, further comprising: receiving a fifth message indicating the completion of the handover from the first base station subsystem, and clearing core network resources occupied by the first call during handover and resources occupied in the first base station subsystem; Or, receive a sixth message from the first base station subsystem indicating handover failure, and when the sixth message carries the information that the local switching of the two calls fails, terminate the handover and clear the information for the two calls Core network resources allocated for each call; Or, receiving a sixth message from the first base station subsystem indicating handover failure, and when the sixth message carries the instruction information indicating that the wireless interface fails and the channel is modified back to the original channel, according to the wireless information carried in the sixth message If the interface fails, modify the indication information of the return channel, modify the indication information of the return channel, perform handover failure processing, and clear the core network resources allocated for the two calls. 5. A method for releasing local exchange, comprising: receiving a seventh message from the core network side indicating to perform a handover operation, the seventh message carrying instruction information for releasing local switching of the two calls, and core network resource information allocated for the two calls; According to the seventh message, the local switching of the two calls is released, the two calls are imported into the core network, and the first call of the two calls is switched from the first base station subsystem to the second base station subsystem system. 6. The method for releasing local switching according to claim 5, wherein, when switching the first call in the two calls to the second base station subsystem, further comprising: Send an eighth message indicating handover completion to the core network side. 7. The method for releasing local switching as claimed in claim 5, further comprising: When the local switching of the two calls cannot be released or the two calls cannot be imported into the core network, a ninth message indicating handover failure is sent to the core network side, and the ninth message carries the information of releasing the two calls. Information about the local switching failure of the call; Or, when the first call cannot be handed over to the second base station subsystem, the two calls are imported into the core network, and a ninth message indicating handover failure is sent to the core network side, and the ninth message carries If the wireless interface fails, modify the information of the original channel. 8. A method for releasing local exchange, comprising: Receive a tenth message from the core network side instructing to perform a handover operation, the tenth message carrying instruction information for releasing the local switching of the two calls and the core network allocated for the second call among the two calls Internet resource information; switching the first call of the two calls to the second base station subsystem according to the information carried in the tenth message; When receiving the eleventh message from the core network side indicating to clear resources, release the local switching of the two calls, and import the second call to the core network. 9. The method for releasing local switching according to claim 8, further comprising: after introducing the second call into the core network: Clearing resources of the first base station subsystem occupied by the second call handover. 10. The method for releasing local switching according to claim 8 or 9, further comprising: When the first call cannot be imported into the core network or the local switching of the two calls cannot be released, send a twelfth message indicating the handover failure to the core network side; Or, when the first call cannot be handed over to the second base station subsystem, maintain the local switching of the two calls, and send a twelfth message indicating handover failure to the core network side, in the twelfth message If the wireless interface fails, modify the information back to the original channel. 11. A method for releasing local exchange, comprising: receiving a thirteenth message requesting handover sent by the third base station subsystem, where the thirteenth message carries information about applying for cancellation of local switching; When it is determined that the local switching of the two calls corresponding to the thirteenth message is allowed to be released, send a fourteenth message indicating to perform a handover operation to the third base station subsystem, and instruct the third base station subsystem to release the two calls local exchange. 12 . The method for releasing local switching according to claim 11 , wherein the fourteenth message also carries core network resource information allocated for the two calls. 13. The method for releasing local switching according to claim 12, further comprising: When receiving a fifteenth message from the third base station subsystem indicating that the handover of the two calls is completed, clear the resources of the third base station subsystem occupied by the two calls during handover; Or, receiving a sixteenth message from the third base station subsystem indicating that the switching of the two calls failed, where the sixteenth message carries information that the local switching of the two calls fails; according to the The sixteenth message carries the information that the local switching of the two calls fails, terminates the handover, and clears the core network resources allocated for the two calls. 14. The method for releasing local switching according to any one of claims 11 to 13, wherein when receiving the thirteenth message requiring handover sent from the third base station subsystem, further comprising: When it is determined that the local switching of the two calls corresponding to the handover request message is not allowed to be released, send a seventeenth message rejecting the handover request to the third base station subsystem, and the seventeenth message carries a disallowed Instructions for disabling local switching. 15. A core network device, characterized in that it comprises: The first receiving unit is configured to receive a message from the first base station subsystem, where the message includes a first message requiring handover; a first judging unit, configured to judge the area after the switching of the two calls corresponding to the first message received by the first receiving unit; The first resource management unit is used to manage core network resources, including: when the first judging unit judges that the first call of the two calls will be located in the second base station subsystem after the handover, for the two calls Call allocation of core network resources; The first sending unit is configured to send a message to the second base station subsystem, including: a second message requesting handover, the second message carrying the first resource management unit as the first of the two calls Core network resources for call allocation; The second receiving unit is configured to receive a message from the second base station subsystem, where the message includes a third message representing a handover request confirmation; The second sending unit is configured to send a message to the first base station subsystem, where the message includes an instruction sent to the first base station subsystem to perform a handover operation when the second receiving unit receives the third message A fourth message, the fourth message carries indication information for canceling the local switching of the two calls and the allocated core network resource information. 16. The core network device according to claim 15, wherein the message received by the first receiving unit further includes a fifth message indicating that the handover is completed from the first base station subsystem; The first resource management unit is further configured to, when the first receiving unit receives the fifth message, clear the core network resources occupied by the first call during handover and the resources occupied in the first base station subsystem H. 17. The core network device according to claim 15, wherein the message received by the first receiving unit from the first base station subsystem further includes a sixth message indicating handover failure, and in the sixth message Carrying the information that the local switching of the two calls fails to be released; The first resource management unit is further configured to clear the core network resources allocated for the two calls when the first receiving unit receives the sixth message. 18. A core network device, comprising: The fifth receiving unit is configured to receive a message sent from the third base station subsystem, where the message includes a seventh message requiring handover, and the seventh message carries information for applying to cancel local switching; A second judging unit, configured to judge whether it is allowed to cancel the local switching of the two calls corresponding to the handover request message; The fifth sending unit is configured to send a message to the third base station subsystem, where the message includes: when the second judging unit judges that the local switching of the two calls is allowed to be released, the sent instruction performs the handover operation The eighth message is used to instruct the third base station subsystem to cancel the local switching of the two calls. 19. The core network device according to claim 18, wherein the seventh message sent by the fifth sending unit further carries core network resource information allocated for the two calls. 20. The core network device according to claim 18, wherein the message received by the fifth receiving unit further includes: an eighth message indicating that the switching of the two calls is completed, or an eighth message indicating that the switching of the two calls fails A ninth message, where the ninth message carries information that the local switching of the two calls fails to be released; A third resource management unit is also included, configured to, when the fifth receiving unit receives the eighth message indicating that the handover of the two calls is completed, clear the third base station subsystem occupied by the two calls during the handover resources; or clear the core network resources allocated for the two calls when the fifth receiving unit receives the ninth message indicating that the handover of the two calls fails. 21. The core network device according to claim 18, wherein the message sent by the fifth sending unit further includes: the second judging unit judging that it is not allowed to cancel the two calls corresponding to the seventh message When the local switching is performed, the ninth message that rejects the handover request is sent to the third base station subsystem, and the ninth message carries indication information that the local switching is not allowed to be canceled. 22. A base station subsystem, characterized in that it comprises: The third receiving unit is configured to receive a message from the core network side, the message includes a tenth message indicating to perform a handover operation, the tenth message carries instruction information for canceling the local switching of the two calls, and is for all The core network resource information allocated by the above two calls; The first local switching canceling unit is configured to cancel the local switching of the two calls according to the indication information of canceling the local switching of the two calls carried in the tenth message received by the third receiving unit; a first importing unit, configured to import the two calls into the core network according to the core network resources allocated for the two calls carried in the tenth message received by the third receiving unit; The first switching unit is configured to switch the first call of the two calls from the first base station subsystem to the second base station subsystem according to the tenth message received by the third receiving unit. 23. The base station subsystem according to claim 22, further comprising: The third sending unit is configured to send a message to the core network side, where the message includes an eleventh message indicating handover completion. 24. The base station subsystem according to claim 23, wherein the message sent by the third sending unit to the core network side further includes: when the local switching of the two calls cannot be canceled or the two When a call is imported into the core network, the twelfth message indicating the handover failure is sent to the core network side, and the twelfth message carries the information that the local switching failure of the two calls is released. 25. The base station subsystem according to claim 23, wherein the message sent by the third sending unit to the core network side further includes: when the first call cannot be handed over to the second base station subsystem, send A twelfth message sent by the core network side indicating that the handover fails, and the twelfth message carries information that the wireless interface fails and the original channel is modified; The first importing unit is further configured to import the two calls into the core network when the first call cannot be handed over to the second base station subsystem. 26. A base station subsystem, characterized in that it comprises: The fourth receiving unit is configured to receive a message from the core network side, including a thirteenth message indicating to perform a handover operation and a fourteenth message indicating to clear resources, and the thirteenth message carries local information for releasing two calls. exchanged indication information and core network resource information allocated for the second call of the two calls; The second switching unit is configured to switch the first call of the two calls from the first base station subsystem to the second base station subsystem according to the information carried in the thirteenth message received by the fourth receiving unit; The second local switching release unit is configured to release the local switching of the two calls when the fourth receiving unit receives the fourteenth message; The second importing unit is configured to import the second call into the core network when the fourth receiving unit receives the fourteenth message. 27. The base station subsystem according to claim 26, further comprising a second resource management unit configured to clear the second call after the second import unit imports the second call into the core network. Resources of the first base station subsystem occupied by the call. 28. The base station subsystem according to claim 26 or 27, further comprising a fourth sending unit configured to send a message to the core network, the message including: when the first call cannot be imported into the core network Or when the local switching of the two calls cannot be released, send the sixteenth message indicating the handover failure to the core network side; or, when the first call cannot be handed over to the second base station subsystem, send the sixteenth message to the core network side The sixteenth message indicating the handover failure sent by the side, the sixteenth message carries the information that the wireless interface fails and the channel is modified back to the original channel. 29. A base station subsystem, comprising: The sixth receiving unit is configured to receive a message from the core network side, the message includes a seventeenth message indicating to perform a handover operation, and the seventeenth message carries instruction information for canceling local switching of two calls, and Core network resource information allocated for the two calls; The third local switching canceling unit is configured to cancel the local switching of the two calls according to the indication information of canceling the local switching of the two calls carried in the seventeenth message received by the sixth receiving unit; a third importing unit, configured to import the two calls into the core network according to the core network resources allocated for the two calls carried in the seventeenth message received by the sixth receiving unit; The third switching unit is configured to switch the first call of the two calls from the first cell to the second cell according to the receipt of the seventeenth message by the sixth unit.

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