WO2010091627A1

WO2010091627A1 - Method, device and system for establishing the local switch

Info

Publication number: WO2010091627A1
Application number: PCT/CN2010/070575
Authority: WO
Inventors: 朱星; 秦钧; 王之曦
Original assignee: 华为技术有限公司
Priority date: 2009-02-10
Filing date: 2010-02-09
Publication date: 2010-08-19
Also published as: CN101801105A

Abstract

A method, device and system for establishing the local switch is provided by the present invention embodiments, it relates to the communication field to solve the problems that MSC can not in time establish the local switch for the call pair in BSS, that the local switch is established by BSC may result in MSC unable to control the call establishing the local switch. The technical scheme provided by the present invention includes of: sending a local switch request message to a Mobile Switch Center (MSC); receiving a local switch setup message returned back from the Mobile Switch Center, establishing the local switch according to the local switch setup message. The technical scheme provided by the present invention embodiments may apply in the communication systems such as WCDMA, TD-SCDMA AND LTE and so on.

Description

Method, device and system for establishing a local exchange This application claims priority to a Chinese patent application filed on February 10, 2009 by the Chinese Patent Office, Application No. 200910005894.2, entitled "Method, Apparatus and System for Establishing Local Exchange" The entire content of which is incorporated herein by reference. Technical field

The present invention relates to the field of communications, and in particular, to a method, apparatus, and system for establishing a local exchange. Background technique

The transmission network is an important part of the wireless communication network. At present, operators in many countries and regions have affected the deployment, operation, and service development of wireless networks because of the bottleneck of the transmission resources connecting the radio access network and the core network. In order to save communication resources and reduce network construction and operation costs, in the prior art, if the calling parties constituting the session are located in the same base station subsystem (BSS), local exchange can be established for both parties of the call. The calling parties are made to communicate by local exchange. At present, a method for establishing a local exchange provided by the prior art includes: determining, by a base station controller (BSC) in a BSS, whether a calling party constituting a session can establish a local exchange, and if a local exchange can be established, The BSC establishes a local exchange for both parties to the call. However, the Mobile Switch Center (MSC) cannot know which calls the BSC has established for local calls, so that it is impossible to control both parties that establish local exchange. Summary of the invention

Embodiments of the present invention provide a method, an apparatus, and a system for establishing a local exchange, which are capable of establishing a local call pair for a local exchange condition in a base station subsystem under the control of a mobile switching center. Exchange.

In one aspect, an embodiment of the present invention provides a method for establishing a local exchange, including: sending a local exchange request message to a mobile switching center; receiving a local exchange setup message returned by the mobile switching center, and establishing a local exchange setup message according to the local exchange Local exchange.

On the other hand, an embodiment of the present invention further provides a method for establishing a local exchange, including: receiving a local exchange request message sent by a base station subsystem; obtaining, according to the local exchange request message, a call pair from the base station subsystem a call pair that satisfies a local exchange condition; a local exchange setup message is sent to the base station subsystem, the local exchange setup message being used to instruct the base station subsystem to establish a local exchange for the call pair that satisfies the local exchange condition.

On the other hand, the embodiment of the present invention further provides a device for establishing a local exchange, which is applied in a base station subsystem, and includes:

a first sending unit, configured to send a local exchange request message to the mobile switching center;

And an establishing unit, configured to receive a local exchange setup message returned by the mobile switching center, and establish a local exchange according to the local exchange setup message.

On the other hand, an embodiment of the present invention further provides a mobile switching center, including:

a receiving unit, configured to receive a local exchange request message sent by the base station subsystem;

And an obtaining unit, configured to acquire, according to the local exchange request message received by the receiving unit, a call pair that satisfies a local exchange condition from a call pair of the base station subsystem;

And a sending unit, configured to send a local exchange setup message to the base station subsystem, where the local exchange setup message is used to indicate that the base station subsystem establishes a local exchange for the call pair that meets the local exchange condition acquired by the acquiring unit.

In still another aspect, an embodiment of the present invention further provides a system for establishing a local exchange, including the apparatus for establishing a local exchange and a mobile switching center as described above. The method, device and system for establishing a local exchange provided by the embodiment of the present invention, the local exchange request is initiated by the device establishing the local exchange on the base station subsystem side, so that the local exchange is initiated more timely; since the device for establishing the local exchange is based on the mobile The local exchange setup message sent by the switching center establishes local switching, so that the mobile switching center can control the call pair in the base station subsystem that satisfies the local exchange. The technical solution provided by the embodiment of the present invention can establish a local exchange for a call pair in the base station subsystem that satisfies the local exchange condition under the control of the mobile switching center. DRAWINGS

FIG. 1 is a flowchart of a method for establishing a local exchange according to an embodiment of the present invention;

2 is a flowchart of a method for establishing a local exchange according to another embodiment of the present invention;

3 is a flowchart of a method for establishing a local exchange according to another embodiment of the present invention;

4 is a schematic structural diagram 1 of a device for establishing a local exchange according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an establishing unit 402 in a device for establishing a local exchange according to an embodiment of the invention shown in FIG. 4;

FIG. 6 is a schematic structural diagram 2 of a device for establishing a local exchange according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram 1 of a mobile switching center according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a transmitting unit 703 in a mobile switching center according to an embodiment of the present invention shown in FIG. 7;

FIG. 9 is a schematic structural diagram 2 of a mobile switching center according to an embodiment of the present invention. detailed description

In order to solve the problem that the MSC cannot establish a local exchange for the call pair in the BSS in time, and the establishment of the local exchange by the BSC may cause the MSC to be unable to control the establishment of the locally exchanged call pair, the embodiment of the present invention provides a method and a device for establishing a local exchange. And system.

As shown in FIG. 1, the method for establishing a local exchange provided by the embodiment of the present invention includes: Step 101: Send a local exchange request message to the MSC.

Step 102: Receive a local exchange setup message returned by the MSC, and establish a local exchange according to the local exchange establishment message.

The method for establishing a local exchange provided by the embodiment of the present invention can initiate a local exchange request to the MSC, so that the local exchange is initiated in a timely manner. The method provided by the embodiment of the present invention can establish a local exchange according to the local exchange setup message sent by the MSC, so that The MSC is capable of controlling a call pair in the BSS that satisfies the local exchange. The technical solution provided by the embodiment of the present invention can establish a local exchange for a call pair in the BSS that satisfies the local exchange condition under the control of the MSC.

Corresponding to the method shown in FIG. 1, as shown in FIG. 2, another embodiment of the present invention further provides a method for establishing a local exchange, including:

Step 201: Receive a local exchange request message sent by the BSS.

Step 202: Obtain a call pair that satisfies the local exchange condition from the call pair of the BSS according to the local exchange request message.

Step 203: Send a local exchange setup message to the BSS, where the local exchange setup message is used to instruct the BSS to establish a local exchange for the call pair that meets the local exchange condition.

The method for establishing a local exchange provided by the embodiment of the present invention, the BSS actively initiates a local exchange request, so that the local exchange is initiated more timely; the method provided by the embodiment of the present invention can send a local exchange setup message to the BSS, and the BSS is indicated by the message. Establishing a local exchange for the call pair that satisfies the local exchange condition enables the method to control the establishment of a locally switched call pair. The technical solution provided by the embodiment of the present invention can establish a local exchange for a call pair in the BSS that satisfies the local exchange condition under the control of the MSC.

In order to enable a person skilled in the art to more clearly understand the technical solutions provided by the embodiments of the present invention, the method for establishing local exchange provided by the embodiments of the present invention is detailed in the following embodiments. Description.

As shown in FIG. 3, a method for establishing a local exchange according to another embodiment of the present invention includes: Step 301: A BSS determines whether an application for establishing a local exchange is required.

In this embodiment, the BSS may determine, according to the usage status of the transmission resource, whether to apply for establishing a local exchange, for example, if the BSS determines an Abis interface between the BSC and a Base Transceiver Station (BTS) or between the BSC and the MSC. If the user plane transmission resource of the A interface is tight, it is determined that the local exchange needs to be established; or the local exchange establishment request period may be determined according to a preset local exchange establishment request period, for example: when a preset local exchange establishment application period arrives, Then, the BSS determines that it needs to apply for establishing a local exchange; of course, in actual use, the BSS can also determine whether it is necessary to establish a local exchange by other means, and this is not done in each case.

Step 302: If it is required to apply for establishing a local exchange, the BSS sends a local exchange request message to the MSC.

In this embodiment, the step 302 may be performed by the BSC in the BSS to send a Local Switch Required message to the MSC, where the local exchange request message may be a connectionless signaling connection control protocol (Signing) A connection control part (SCCP) message, the local exchange request message may carry related information such as the identifier of the BSS.

Step 303: The MSC receives a local exchange request message sent by the BSS.

Step 304: The MSC obtains, according to the local exchange request message received in step 303, a call pair that satisfies the local exchange condition from the call pair of the BSS.

In this embodiment, the MSC may determine, according to the information about the BSS that is carried in the local exchange request message, the BSS that needs to establish a local exchange, and record the cell identifier of the call pair that constitutes the session in the BSS (Cell- ID), determining whether the call pair in the BSS satisfies the local exchange condition in combination with the codec used by the call pair, and the current service status and the like. For example: If BSS is composed If the call-to-ID of the call pair of the session is the same, the codec of the call pair is the same, and no other supplementary service is performed between the call pairs, the MSC determines that the call pair satisfies the local exchange condition; If the Cell-IDs of the call pairs constituting the session in the BSS are the same, the codec mode of the call pair is different, and no other supplementary services are performed between the call pairs, the MSC determines if the code converter (Transcoder, TC) is physically located on the BSS side, then the call pair satisfies the local exchange condition, otherwise, the local exchange condition is not satisfied. Whether the call pair in the middle meets the local exchange condition, and this is not done here - repeat.

Step 305: The MSC sends a local exchange setup message to the BSS, where the local exchange setup message is used to instruct the BSS to establish a local exchange for the call pair that meets the local exchange condition acquired in the step 304.

In this embodiment, the local exchange setup message may be a local exchange command (Local Switch Command) message, and the local exchange command message is a connected SCCP message, and the MSC may obtain the local exchange through the step 304. a SCCP connection of the calling party and/or the called party of the conditional call pair, sending the local exchange command message to the BSS;

In this embodiment, the local exchange command may carry a caller identity (Call-ID) and/or a called party Call-ID of the call pair that satisfies the local exchange condition, for example: if the local exchange command The message is transmitted by the calling party's SCCP connection of the call pair that satisfies the local exchange condition, and the local exchange command message may only carry the called party Call-ID of the call pair that satisfies the local exchange condition, or may carry the same The called party Call-ID, which in turn carries the calling party Call-ID; if the local exchange command message is transmitted through the SCCP connection of the called party that satisfies the call pair of the local exchange condition, the local exchange The command message may carry only the calling party Call-ID of the call pair that satisfies the local switching condition, and may also carry the calling party Call-ID and carry the called party Call-ID; Deriving a local exchange command message by calling the called party and the called party of the call pair satisfying the local exchange condition

For the SCCP connection transmission, the local exchange command message transmitted through the calling party SCCP connection may carry only the called party Call-ID of the call pair that satisfies the local exchange condition, and the local exchange command message transmitted through the called party SCCP connection may only carry Calling party Call-ID of the call pair that satisfies the local exchange condition. Of course, the two local exchange command messages transmitted by the calling party SCCP connection and the called party SCCP connection may also carry the call satisfying the local exchange condition at the same time. The calling party Call-ID and the called party Call-ID; it is worth noting that, if the MSC obtains a plurality of call pairs satisfying the local exchange condition from the call pair of the BSS in step 304, In this step, the MSC may send the local exchange command message to the BSS through the SCCP connection of each calling party and/or called party of the call pair that satisfies the local switching condition, respectively;

Preferably, if, in the step 304, the MSC obtains a plurality of call pairs that satisfy the local exchange condition from the call pair of the BSS, in order to save signaling traffic of the A interface, improve communication execution efficiency, the local exchange The establishment message may also be a Local Switch Indication message, the local exchange indication message is a connectionless SCCP message, and the MSC may add the call that meets the local exchange condition acquired in step 304 to the local exchange indication message. Pairing the list, and transmitting, to the BSS, a local exchange indication message carrying the call pair list that satisfies the local exchange condition, wherein the call list includes a calling party Call-ID and a suffix that each pair of locally exchanged call pairs is satisfied Calling the Call-ID, in actual use, the call list may also contain other identification information for each pair of call pairs that meet the local exchange, and this is not done for each case--details;

In actual use, the MSC may send a local exchange setup message to the BSS in any one of the above manners. In addition, the local exchange setup message may also be sent to the BSS in other manners. - Narration.

Step 306: The BSS receives a local exchange setup message returned by the MSC, according to the local handover. Change the setup message to establish a local exchange.

In this embodiment, the BSS may establish a local exchange according to the local exchange setup message by any one of the following methods:

And if the local exchange setup message is a local exchange indication message and carries a call pair list that satisfies a local exchange condition, the BSS establishes a local exchange for the call pair indicated by the call pair list that satisfies the local exchange condition;

If the local exchange setup message is a local exchange command message, and the local exchange command message is transmitted by the calling party and/or the called party's SCCP connection of the call pair that satisfies the local exchange condition, the BSS is based on the local The command message is exchanged to establish a local exchange for the call pair that satisfies the local exchange condition. For example, if the local exchange command message is transmitted by a calling party SCCP connection of a call pair that satisfies a local exchange condition, the BSS may be configured according to the called party Call-ID carried in the local exchange command message. The call indicated by the called party Call-ID establishes a local exchange with the call corresponding to the calling party SCCP; if the local exchange command message is transmitted by the called party SCCP connection of the call pair satisfying the local exchange condition, the BSS And establishing, according to the calling party Call-ID carried in the local exchange command message, a local exchange for the call indicated by the calling party Call-ID and the call corresponding to the called party SCCP; if the local exchange command The message is transmitted by the calling party and the called party's SCCP connection of the calling pair satisfying the local switching condition, and the BSS may according to the called party Call carried in the local exchange command message transmitted through the calling party SCCP connection. ID, establishing a local exchange for the call indicated by the called party Call-ID and the call corresponding to the calling party SCCP, and the BSS may also be transmitted according to the SCCP connection through the called party The calling party Call-ID carried in the local exchange command message establishes a local exchange for the call indicated by the calling party Call-ID and the call corresponding to the called party SCCP. It should be noted that if the local exchange command message carries both the calling party Call-ID and the called party Call-ID of the call pair satisfying the local exchange condition, the BSS may directly root. According to the calling party Call-ID and the called party Call-ID, a local exchange is established for the calling party indicated by the calling party Call-ID and the called party Call-ID.

Of course, in the actual use process, the BSS may also establish a local exchange according to the local exchange setup message by other means, and this is not done in each case.

Step 307: The BSS sends a message to the MSC to indicate a local exchange establishment result.

In this embodiment, the message for indicating the result of the local exchange establishment may be a connected SCCP message, and the BSS may pass the calling party and/or the called party of the call pair that satisfies the local exchange condition. The SCCP connection sends the message for indicating the result of the local exchange establishment. Specifically, if the local exchange of the call pair that satisfies the local exchange condition is successfully established, the message indicating the local exchange establishment result is completed by the local exchange. (Local Switch Complete) message, the local exchange complete message may carry local exchange establishment success indication information, and the calling party Call-ID and/or the called party Call-ID of the call pair satisfying the local exchange condition, if If the local exchange establishment of the call pair that meets the local exchange condition fails, the message indicating the local exchange establishment result is a local switch failure (Local Switch Failure) message, and the local exchange failure message may carry the local exchange establishment failure indication information. And the calling party Call of the call pair that satisfies the local exchange condition ID and / or called party Call-ID;

In this embodiment, if the BSS establishes a local exchange for multiple call pairs in step 306, in order to save the signaling traffic, the message for indicating the local exchange establishment result may also be a connectionless SCCP message, for example, : a Local Switch Performed message, the local exchange execution message may carry a list of call pairs that are successfully established by the local exchange, or a list of call pairs that fail to establish a local exchange, or a list of call pairs that satisfy the local exchange condition and the local call list that satisfies the local exchange condition The information of the local exchange establishment result of each pair of calls in the call pair of the exchange condition.

Step 308: The MSC receives a message sent by the BSS to indicate a local exchange establishment result, where And operating the call pair that satisfies the local exchange condition according to the message used to indicate the result of the local exchange establishment.

Specifically, if the message used to indicate the local exchange establishment result is a local exchange complete message, the MSC releases the occupied A-interface user plane resource of the call pair indicated by the local exchange complete message; The message of the local exchange establishment result is a local exchange failure message, and the MSC maintains the call state of the call pair indicated by the local exchange failure message unchanged; if the message for indicating the local exchange establishment result is a connectionless SCCP message If the local exchange performs the message, the MSC operates the call pair that meets the local exchange condition according to the information carried in the local exchange execution message, for example: if the local exchange execution message carries the local exchange successfully established. The call pair list, the MSC releases the A-interface user plane resource occupied by the call pair indicated by the call pair list successfully established by the local exchange, and the MSC maintains the call pair list that is successfully established by the local exchange, The call pair obtained in step 304 that satisfies the local exchange condition Called state unchanged.

It should be noted that, in this embodiment, the local exchange can be divided into two types: one is that the local exchange in the BTS - the call pair of the BSS is located in the same BTS or in the same BTS cluster, and the local exchange occurs in The call pair is in the BTS that is connected in common; the other is, the local exchange in the BSC - the call pair of the BSS is located in the same BSC, but is located in a different BTS or BTS cluster, and the local exchange occurs in the call pair Connected in the BSC. If the call pair that establishes the local exchange is the local exchange in the BTS, the embodiment of the present invention further includes the step of releasing the Abis interface user plane resource occupied by the call pair by the BSS.

The method for establishing a local exchange provided by the embodiment of the present invention, the local exchange request is initiated by the BSS side, so that the local exchange is initiated more timely; and the BSS is locally switched according to the local exchange setup message sent by the MSC, so that the The MSC can control the call pair in the BSS that satisfies the local exchange. The technical solution provided by the embodiment of the present invention can be BSS in time under the control of the MSC. A call pair that satisfies the local exchange condition establishes a local exchange.

Corresponding to the above method, as shown in FIG. 4, the embodiment of the present invention further provides a device for establishing a local exchange, which is applied in a base station subsystem, and includes:

a first sending unit 401, configured to send a local exchange request message to the mobile switching center;

The establishing unit 402 is configured to receive a local exchange setup message returned by the mobile switching center, and establish a local exchange according to the local exchange setup message. For the specific implementation method, refer to step 306 shown in FIG. 3, where No longer.

Further, as shown in FIG. 5, the establishing unit 402 may include:

a first establishing subunit 4021, configured to: if the local exchange setup message carries a call pair list that satisfies a local exchange condition, establish a local exchange for the call pair indicated by the call pair list that satisfies the local exchange condition; and/or

a second establishing sub-unit 4022, configured to perform, according to the local exchange, if the local exchange setup message is transmitted by a calling party and/or a called party's signaling connection control protocol SCCP connection that satisfies a call pair of a local exchange condition A message is established to establish a local exchange for the call pair that satisfies the local exchange condition.

Further, as shown in FIG. 6, the apparatus for establishing a local exchange may further include:

The second sending unit 403 is configured to send, according to the local exchange establishment result of the establishing unit 402, a message for indicating a local exchange establishment result to the mobile switching center, and a specific implementation method thereof is shown in FIG. As described in step 307, details are not described herein again.

The determining unit 404 is configured to determine whether it is required to apply for establishing a local exchange. If the application needs to establish a local exchange, the first sending unit 401 is instructed to send a local exchange request message to the mobile switching center. As shown in step 301, it will not be described here.

In this embodiment, the device for establishing local exchange may be a base station controller or a base station. The device for establishing a local exchange provided by the embodiment of the present invention can initiate a local exchange request to the MSC, so that the local exchange is initiated in a timely manner. The device provided by the embodiment of the present invention can establish a local exchange according to the local exchange setup message sent by the MSC, so that The MSC is capable of controlling a call pair in the BSS that satisfies the local exchange. The technical solution provided by the embodiment of the present invention can establish a local exchange for a call pair in the BSS that satisfies the local exchange condition under the control of the MSC.

As shown in FIG. 7, an embodiment of the present invention further provides a mobile switching center, including:

The receiving unit 701 is configured to receive a local exchange request message sent by the base station subsystem.

The obtaining unit 702 is configured to obtain, according to the local exchange request message received by the receiving unit 701, a call pair that meets a local exchange condition from a call pair of the base station subsystem, and a specific implementation method thereof is shown in FIG. Step 304, which will not be described here;

The sending unit 703 is configured to send a local exchange setup message to the base station subsystem, where the local exchange setup message is used to indicate that the base station subsystem establishes a local exchange for the call pair that meets the local exchange condition acquired by the acquiring unit 702. For the specific implementation, refer to step 305 shown in Figure 3, and details are not described herein.

Further, as shown in FIG. 8, the sending unit 703 may include:

a first sending subunit 7031, configured to send a local exchange setup message carrying a call pair list that satisfies a local exchange condition; and/or

The second sending subunit 7032 is configured to send the local exchange setup message by using the SCCP connection of the calling party and/or the called party of the call pair that meets the local switching condition acquired by the acquiring unit 702.

Further, as shown in FIG. 9, the mobile switching center may further include:

The operation unit 704 is configured to receive a message sent by the base station subsystem to indicate a local exchange establishment result, and use the message for indicating a local exchange establishment result to obtain a call that meets the local exchange condition acquired by the acquiring unit. For the operation, the specific implementation method can be seen in Figure 3. The description of step 308 is not repeated here.

In the mobile switching center provided by the embodiment of the present invention, the BSS actively initiates a local exchange request, so that the local exchange is initiated more timely. The mobile switching center provided by the embodiment of the present invention can send a local exchange setup message to the BSS, and the BSS is indicated by the message. Establishing a local exchange for the call pair that satisfies the local exchange condition enables the mobile switching center to control the establishment of a locally switched call pair. The technical solution provided by the embodiment of the present invention can establish a local exchange for a call pair in the BSS that satisfies the local exchange condition in time under the control of the MSC.

The embodiment of the present invention further provides a system for establishing a local exchange, including: a device for establishing a local exchange as shown in FIGS. 4 to 6 and a mobile switching center as shown in FIGS.

The specific structural functions are basically similar to the foregoing embodiments of the apparatus for establishing a local exchange and the structural functions of the mobile switching center embodiment, and are not described herein again.

The system for establishing a local exchange provided by the embodiment of the present invention initiates a local exchange request by the device establishing the local exchange on the base station subsystem side, so that the local exchange is initiated more timely; since the device for establishing the local exchange is sent according to the mobile switching center The local exchange setup message establishes local switching so that the mobile switching center can control the call pair in the base station subsystem that satisfies the local exchange. The technical solution provided by the embodiment of the present invention can establish a local exchange for a call pair in a base station subsystem that satisfies the local exchange condition under the control of the mobile switching center.

The method, device and system for establishing local exchange provided by the embodiments of the present invention can be applied in communication systems such as WCDMA, TD-SCDMA and LTE.

A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, such as ROM/RAM, magnetic. Disc or CD.

The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited to Therefore, any person skilled in the art can easily conceive changes or substitutions within the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A method for establishing a local exchange, comprising:

Receiving a local exchange request message sent by the base station subsystem;

Obtaining, according to the local exchange request message, a call pair that satisfies a local exchange condition from a call pair of the base station subsystem;

And transmitting, by the base station subsystem, a local exchange setup message, the local exchange setup message being used to instruct the base station subsystem to establish a local exchange for the call pair that satisfies the local exchange condition.

2. The method according to claim 1, wherein the sending the local exchange setup message to the base station subsystem comprises:

Transmitting a local exchange setup message carrying a list of call pairs that satisfy the local exchange condition; and/or transmitting the local exchange setup message via the SCCP connection of the calling party and/or the called party of the call pair that satisfies the local exchange condition.

3. The method according to claim 1, further comprising:

Receiving a message sent by the base station subsystem to indicate a local exchange establishment result, and operating the call pair that satisfies the local exchange condition according to the message used to indicate a local exchange establishment result.

4. A method of establishing a local exchange, the method comprising:

Sending a local exchange request message to the mobile switching center;

A local exchange setup message returned by the mobile switching center is received, and a local exchange is established based on the local exchange setup message.

The method according to claim 4, wherein the establishing a local exchange according to the local exchange setup message comprises:

If the local exchange setup message carries a list of call pairs that satisfy the local exchange condition, Determining a call pair indicated by a call pair list satisfying a local exchange condition to establish a local exchange; and/or if the local exchange setup message is controlled by a signaling connection of a calling party and/or a called party of a call pair that satisfies a local exchange condition The protocol SCCP connection transmission, based on the local exchange setup message, establishes a local exchange for the call pair that satisfies the local exchange condition.

The method according to claim 4, wherein after the establishing the local exchange according to the local exchange setup message, the method further includes:

A message is sent to the mobile switching center to indicate the result of the local exchange establishment.

The method according to claim 6, wherein the sending, to the mobile switching center, a message indicating a local exchange establishment result includes:

The message indicating the result of the local exchange establishment is sent by the calling party of the call pair that satisfies the local exchange condition and/or the SCCP connection of the called party.

The method according to claim 6, wherein the message for indicating the result of the local exchange establishment carries a list of call pairs that are successfully established by the local exchange, or a list of call pairs that failed to be established by the local exchange, or meets the local exchange. The list of conditional call pairs and the local exchange establishment result for each pair of calls in the list of call pairs that satisfy the local exchange condition.

9. A mobile switching center, characterized in that:

10. The mobile switching center according to claim 9, wherein the sending unit package Includes:

a first sending subunit, configured to send a local exchange setup message carrying a call pair list that satisfies a local exchange condition; and/or

And a second sending subunit, configured to send the local exchange setup message by using a SCCP connection of the calling party and/or the called party of the call pair that satisfies the local switching condition acquired by the acquiring unit.

The mobile switching center according to claim 9, further comprising: an operation unit, configured to receive a message sent by the base station subsystem to indicate a local exchange establishment result, according to the The message of the establishment result is exchanged, and the call pair obtained by the acquiring unit that satisfies the local exchange condition is operated.

A device for establishing a local exchange, which is used in a base station subsystem, and includes: a first sending unit, configured to send a local exchange request message to a mobile switching center;

The device according to claim 12, wherein the establishing unit comprises: a first establishing subunit, configured to: if the local exchange setup message carries a call pair list that satisfies a local exchange condition, Calls indicated by the call pair list satisfying the local exchange condition establish a local exchange; and/or

a second establishing subunit, configured to establish, according to the local exchange, if the local exchange setup message is transmitted by a caller control protocol SCCP connection of a calling party and/or a called party of a call pair that satisfies a local exchange condition A message is established for the call pair that satisfies the local exchange condition.

14. The device according to claim 12, further comprising:

And a second sending unit, configured to send, according to the local exchange establishment result of the establishing unit, a message for indicating a local exchange establishment result to the mobile switching center.

The device according to claim 12, further comprising:

And a determining unit, configured to determine whether it is required to establish a local exchange, and if it is determined that the local exchange needs to be established, the first sending unit is instructed to send a local exchange request message to the mobile switching center.

The apparatus according to any one of claims 12 to 15, wherein the means for establishing a local exchange is a base station controller or a base station.

A system for establishing a local exchange, comprising: the apparatus for establishing a local exchange according to any one of claims 12 to 15 and the mobile switching center according to any one of claims 9 to 11.