WO2010091612A1

WO2010091612A1 - Method, core network device and base station subsystem for establishing local exchange

Info

Publication number: WO2010091612A1
Application number: PCT/CN2010/070430
Authority: WO
Inventors: 朱星; 秦钧; 王之曦; 王超
Original assignee: 华为技术有限公司
Priority date: 2009-02-10
Filing date: 2010-01-30
Publication date: 2010-08-19
Also published as: CN101801046A; CN101801046B

Abstract

A method, core network device and base station subsystem for establishing a local exchange are provided, wherein a method for establishing a local exchange includes: receiving a first message requesting for handover from the first base station subsystem; based on the said first message requesting for handover, when it is determined that the two calls composing the session locate in the second base station subsystem after the handover is completed, and satisfy the local exchange condition, transmitting a second message requesting for handover to the said second base station subsystem, instructing the said second base station subsystem to establish a local exchange for said two calls after the said handover is succeeded. The technical solutions of the present invention do not need to add an extra process for establishing the local exchange, and the local exchange is realized during the handover, so the time to perform the process is saved, and the number of the message from the A interface is reduced. Because a separate process is not needed to establish a local exchange, the adverse influence to the call quality caused by establishing the local exchange is avoided, thus the user experience is improved.

Description

建立本地交换的方法、核心网设备 ½站子*** 本申请要求于 2009 年 2 月 10 日提交中国专利局、申请号为 200910005199. 6 , 发明名称为"建立本地交换的方法、核心网设备及基站子***"的中国专利申请的优先权，其全部内容通过引用结合在本申请中。 Method for establishing local exchange, core network device 1⁄2 station subsystem This application claims to be submitted to the Chinese Patent Office on February 10, 2009, application number 200910005199. 6 , the invention name is "establish local exchange method, core network equipment and base station The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference.

技术领域 Technical field

本发明涉及无线通信技术领域，尤其涉及建立本地交换的方法、核心网设备及基站子***。 The present invention relates to the field of wireless communication technologies, and in particular, to a method for establishing a local exchange, a core network device, and a base station subsystem.

背景技术 Background technique

传输网络是无线通信网络的重要组成部分，目前很多国家和地区的运营商因为连接无线接入网及核心网的传输资源的瓶颈问题，影响了无线网络的部署、运营和业务的开展。在非洲等地区，无线网络的发展速度远高于有线网络的发展。在以欧洲为代表的地区，由于受到当地法律法规的限制，地面有线传输网络的建设无法按照运营商的需求进行建设。即使地面传输资源较为丰富的国家，如中国，也面对着对偏远地区、岛屿进行传输网络建设时的成本高昂，投资回报率低的问题。在上述场景中，运营商通常为采用微波、卫星或租用地面传输线路的方法。因此， P争低对传输网络带宽的占用，可以有效地降低网络建设和运营成本，而本地交换就是一种有效降低传输资源带宽的方法。 The transmission network is an important part of the wireless communication network. Currently, operators in many countries and regions have affected the deployment, operation and service development of the wireless network because of the bottleneck of the transmission resources connecting the wireless access network and the core network. In regions such as Africa, wireless networks are growing much faster than wired networks. In areas represented by Europe, due to local laws and regulations, the construction of terrestrial cable transmission networks cannot be constructed in accordance with the needs of operators. Even countries with abundant terrestrial transmission resources, such as China, face the problem of high cost and low return on investment in the construction of transmission networks in remote areas and islands. In the above scenario, operators typically use microwave, satellite or leased terrestrial transmission lines. Therefore, P is less likely to occupy the bandwidth of the transmission network, which can effectively reduce the network construction and operation costs, and local exchange is a method for effectively reducing the bandwidth of the transmission resources.

移动通信***主要由移动台（MS, Mobile Station )、基站子*** ( BSS, Base Station Subsystem )和网络子***（ NSS， Network Station Subsystem )组成。基站收发台（BTS， Base Transceiver Station )和基站控制器（BSC, Base Station Controller )构成了 BSS。移动交换中心（MSC， Mobile Switching Center )位于 NSS，它控制所有 BSC的业务，提供交换功能及和***内其它功能的连接。图 1为现有技术中全球移动通信***示意图， MSC101通过 A接口与 BSC102通信， BSC 102通过 Abis接口与 BTS103通信， BTS103通过 Um接口与 MS 104通信。 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 (NSS, Network Station Subsystem). Base Transceiver Station (BTS, Base Transceiver Station) and base The station controller (BSC, Base Station Controller) constitutes the BSS. The Mobile Switching Center (MSC) is located at the NSS. It controls the services of all BSCs and provides switching functions and connections to other functions in the system. 1 is a schematic diagram of a prior art global mobile communication system. The MSC 101 communicates with the BSC 102 via an A interface, the BSC 102 communicates with the BTS 103 via an Abis interface, and the BTS 103 communicates with the MS 104 via an Um interface.

参照图 1，对于主叫和被叫位于同一个 BSS内的会话，本地交换可以实现在 BSS 内完成通话链路的环回，即用户面的语音数据不流出该 BSS, 从而实现特定接口传输资源的节省。本地交换包括 BSC 内的本地交换和 BTS内的本地交换。 BTS内的本地交换是指两个呼叫在同一个 BTS, 或者是同一个 BTS簇内（对于 BTS级联的情况），语音链路的环回发生在相应的 BTS 中，如图 1 所示， MS 104-1 的 MS 104-2的语音链路环回发生在 BTS 103-1中， MS 104-3与 MS- 104-4 的语音链路环回发生在 BTS103-2簇内。通过建立 BTS内的本地交换，可以实现对 Abis接口和 A接口传输资源的节省。对于 BSC内的本地交换，会话双方位于同一个 BSC内，但在不同的 BTS ( BTS簇）内，语音链路环回发生在相应的 BSC 中，如图 1 所示， MS104-5 与 MS 104-6的语音链路环回发生在 BSC102-1中。通过建立 BSC内的本地交换，可以实现对 A接口传输资源的节省。 Referring to FIG. 1, for a session in which the calling party and the called party are located in the same BSS, the local switching can complete 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, thereby implementing the specific interface transmission resource. Savings. Local exchanges include local exchanges within the BSC and local exchanges within the BTS. The local exchange in the BTS means that two calls are in the same BTS or in the same BTS cluster (in 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 MS 104-2 of MS 104-1 occurs in BTS 103-1, and the voice link loopback of MS 104-3 and MS-104-4 occurs within the BTS 103-2 cluster. By establishing a local exchange within the BTS, savings in the transmission resources of the Abis interface and the A interface can be achieved. For local switching within the BSC, both parties are located in the same BSC, but in different BTSs (BTS clusters), the voice link loopback occurs in the corresponding BSC, as shown in Figure 1, MS104-5 and MS 104. A -6 voice link loopback occurs in the BSC 102-1. By establishing a local exchange within the BSC, savings in the transmission resources of the A interface can be achieved.

在现有技术中提出的建立本地交换的方法如下： MSC判断出两个呼叫切换后将位于同一个 BSS、并且满足本地交换条件时， MSC 待切换流程结束后，指示所述切换后的 BSS对两个呼叫建立本地交换。 The method for establishing a local exchange proposed in the prior art is as follows: After the MSC determines that two calls are to be located in the same BSS after the handover, and the local exchange condition is met, after the MSC to be switched, the BSS pair is indicated. Two calls establish a local exchange.

在对现有技术的研究和实践过程中，本发明的发明人发现：在切换流程结束后， MSC指示建立本地交换的流程会增加整个流程的执行时间及 A接口的消息数量；并且，切换对通话质量有一定影响，本地交换也会对通话质量有一定的影响，两次不利影响叠加，可能会严重影响用户体验。发明内容本发明实施例提供建立本地交换的方法、核心网设备及基站子系统，能够在切换的同时建立本地交换。 In the research and practice of the prior art, the inventor of the present invention finds that: after the handover process ends, the MSC indicates that the process of establishing the local exchange increases the execution time of the entire process and the number of messages of the A interface; The quality of the call has a certain impact. The local exchange also has a certain impact on the quality of the call. The two adverse effects are superimposed, which may seriously affect the user experience. SUMMARY OF THE INVENTION Embodiments of the present invention provide a method for establishing a local exchange, a core network device, and a base station subsystem, which can establish a local exchange while switching.

本发明的一方面提供了如下的建立本地交换的方法。 An aspect of the present invention provides the following method of establishing a local exchange.

建立本地交换的方法一，包括： Method 1 of establishing a local exchange, including:

接收来自第一基站子***的要求切换的第一消息； Receiving a first message requesting handover from the first base station subsystem;

根据所述要求切换的第一消息确定切换完成后构成会话的两个呼叫都位于第二基站子***、且满足本地交换的条件时，向所述第二基站子***发送请求切换的第二消息，指示所述第二基站子***切换成功后为所述两个呼叫建立本地交换。 Determining, according to the requesting, the first message, that the two calls constituting the session after the handover is completed are located in the second base station subsystem and satisfying the condition of the local exchange, sending a second message requesting the handover to the second base station subsystem. And indicating that the second base station subsystem establishes a local exchange for the two calls after the handover is successful.

建立本地交换的方法二，包括： Method 2 of establishing a local exchange, including:

接收来自基站子***的要求切换的第五消息，所述第五消息中包含为所述基站子***中的构成会话的两个呼叫申请建立本地交换的信息； Receiving a fifth message requesting handover from the base station subsystem, the fifth message including information for establishing local exchange for two call requests constituting the session in the base station subsystem;

根据所述第五消息确定满足为所述两个呼叫建立本地交换的条件时，向所述基站子***发送指示执行切换操作的第六消息，指示所述基站子***为所述两个呼叫建立本地交换。 And determining, according to the fifth message, that a condition for establishing a local exchange for the two calls is met, sending, to the base station subsystem, a sixth message indicating that a handover operation is performed, instructing the base station subsystem to establish the two calls Local exchange.

建立本地交换的方法三，包括： The third method of establishing local exchange includes:

确定构成会话的两个呼叫位于同一基站子***且满足建立本地交换的条件时，向所述基站子***发送询问是否切换的第十消息，所述第十消息包括指示所述基站子***为所述两个呼叫建立本地交换的信息； Determining, when the two calls constituting the session are located in the same base station subsystem and satisfying the condition for establishing a local exchange, transmitting, to the base station subsystem, a tenth message asking whether to switch, the tenth message including indicating that the base station subsystem is Describe two calls to establish local exchange information;

接收来自所述基站子***的要求切换的第十一消息，所述第十一消息中包含为所述两个呼叫申请建立本地交换的信息； Receiving an eleventh message requesting handover from the base station subsystem, where the eleventh message includes information for establishing local exchange for the two call requests;

根据所述第十一消息，向所述基站子***发送指示执行切换操作的第十二消息，所述第十二消息包括指示所述基站子***为所述两个呼叫建立本地交换的信息。本发明的另一方面还提供了如下的核心网设备。 And transmitting, according to the eleventh message, a twelfth message indicating that the handover operation is performed to the base station subsystem, the twelfth message including information indicating that the base station subsystem establishes local exchange for the two calls. Another aspect of the present invention also provides the following core network device.

其中，核心网设备一，包括： Among them, the core network device one includes:

第一接收单元，用于接收来自第一基站子***的消息，所述消息包括要求切换的第一消息； a first receiving unit, configured to receive a message from the first base station subsystem, where the message includes a first message requesting handover;

第一判断单元，用于根据所述第一接收单元接收到的要求切换的第一消息，判断切换完成后构成会话的两个呼叫是否位于所述第二基站子***且满足本地交换的条件；和 a first determining unit, configured to determine, according to the first message that is requested to be switched received by the first receiving unit, whether two calls constituting the session are located in the second base station subsystem and satisfy a condition of local exchange; with

第一发送单元，用于如果切换完成后所述两个呼叫都将位于所述第二基站子***且满足本地交换的条件，向所述第二基站子***发送请求切换的第二消息，所述第二消息包括指示所述第二基站子***切换成功后为所述两个呼叫建立本地交换的信息。 a first sending unit, configured to send a second message requesting handover to the second base station subsystem if the two calls are located in the second base station subsystem after the handover is completed and meet the condition of local exchange The second message includes information indicating that the second base station subsystem establishes a local exchange for the two calls after the handover is successful.

核心网设备二，包括： Core network equipment 2, including:

第三接收单元，用于接收来自基站子***的要求切换的第五消息，所述第五消息中包含为所述基站子***中构成会话的两个呼叫申请建立本地交换的信息； a third receiving unit, configured to receive a fifth message requesting handover from the base station subsystem, where the fifth message includes information for establishing local exchange for two call requests constituting the session in the base station subsystem;

第二判断单元，用于 ^据所述第五消息，判断为所述两个呼叫建立本地交换的条件是否满足；和 a second determining unit, configured to determine, according to the fifth message, whether a condition for establishing local exchange between the two calls is satisfied; and

第二发送单元，用于在所述第二判断单元判断为所述两个呼叫建立本地交换的条件满足时，向所述基站子***发送指示执行切换操作的第六消息，所述第六消息包含指示所述基站子***为所述两个呼叫建立本地交换的信息。 a second sending unit, configured to send, to the base station subsystem, a sixth message indicating that the switching operation is performed, when the second determining unit determines that the condition for establishing the local exchange of the two calls is satisfied, the sixth message Contains information indicating that the base station subsystem establishes a local exchange for the two calls.

核心网设备三，包括：第四判断单元、第三发送单元和第四接收单元，其中： The core network device 3 includes: a fourth determining unit, a third sending unit, and a fourth receiving unit, where:

第四判断单元，用于判断构成会话的两个呼叫是否位于同一基站子***，且满足本地交换建立的条件； a fourth determining unit, configured to determine whether two calls constituting the session are located in the same base station subsystem, and satisfy a condition of local exchange establishment;

第三发送单元，用于在所述第四判断单元判断所述构成会话的两个呼叫均位于所述基站子***，且满足本地交换建立的条件时，向所述基站子***发送询问是否切换的第十消息，所述第十消息包含指示所述基站子***为所述两个呼叫建立本地交换的信息；根据第四接收单元接收到的第十一消息，发送指示执行切换操作的第十二消息，所述第十二消息包含指示所述基站子***为所述两个呼叫建立本地交换的信息； a third sending unit, configured to: when the fourth determining unit determines that the two calls constituting the session are all located in the base station subsystem, and satisfy a condition of local exchange establishment, send a query to the base station subsystem whether to switch Tenth message, the tenth message includes information indicating that the base station subsystem establishes local exchange for the two calls; according to the fourth receiving And an eleventh message received by the unit, sending a twelfth message indicating that the handover operation is performed, where the twelfth message includes information indicating that the base station subsystem establishes local exchange for the two calls;

所述第四接收单元，用于接收来自所述基站子***的消息，所述消息包括要求切换的第十一消息，所述第十一消息包含为所述两个呼叫申请建立本地交换的信息。 The fourth receiving unit is configured to receive a message from the base station subsystem, where the message includes an eleventh message requesting handover, and the eleventh message includes establishing local exchange information for the two call requests. .

本发明的再一方面还提供了如下的基站子***。 Yet another aspect of the present invention also provides a base station subsystem as follows.

基站子***一，包括： The base station subsystem one includes:

第一接收单元，用于接收来自核心网侧的要求切换的第一消息，所述第一消息中包含指示切换成功后为构成会话的两个呼叫建立本地交换的信息；和 a first receiving unit, configured to receive a first message requesting handover from a core network side, where the first message includes information indicating that a local exchange is established for two calls constituting a session after the handover succeeds; and

第一本地交换建立单元，用于根据所述第一接收单元接收到的第一消息，为所述两个呼叫建立本地交换。 And a first local exchange establishing unit, configured to establish a local exchange for the two calls according to the first message received by the first receiving unit.

基站子***二，包括： Base station subsystem 2, including:

第二发送单元，用于向核心网侧发送要求切换的第五消息，所述第五消息中包含为所述基站子***中构成会话的两个呼叫申请建立本地交换的信息； a second sending unit, configured to send a fifth message requesting handover to the core network side, where the fifth message includes information for establishing local exchange for two call requests forming a session in the base station subsystem;

第二接收单元，用于接收来自所述核心网侧的指示执行切换操作的第六消息，所述第六消息包含为所述两个呼叫建立本地交换的指示信息；和 a second receiving unit, configured to receive a sixth message from the core network side indicating that a handover operation is performed, where the sixth message includes indication information for establishing local exchange for the two calls; and

第二本地交换建立单元，用于根据所述第二接收单元接收到的第六消息中包含的为所述两个呼叫建立本地交换的指示信息，为所述两个呼叫建立本地交换。 And a second local exchange establishing unit, configured to establish local exchange for the two calls according to the indication information that is included in the sixth message received by the second receiving unit to establish local exchange for the two calls.

本发明的一方面通过接收来自第一基站子***的要求切换的第一消息，并根据所述要求切换的第一消息，判断切换完成后构成会话的两个呼叫都将位于第二基站子***且满足本地交换的条件时，向所述第二基站子***发送请求切换的第二消息，指示所述第二基站子系统切换成功后为所述两个呼叫建立本地交换，由于不需要增加额外的建立本地交换的流程，在切换的同时实现本地交换，可以节约流程的执行时间，并节约 A接口的消息数量。并且，由于不需要单独的流程建立本地交换，因此不会由于建立本地交换而对通话质量产生不利的影响，从而可以提高用户体验。 An aspect of the present invention is to receive a first message requesting handover from a first base station subsystem, and according to the first message required to be switched, to determine that two calls constituting a session after the handover is completed will be located in the second base station subsystem. And when the condition of the local exchange is met, sending a second message requesting the handover to the second base station subsystem, indicating that the second base station subsystem establishes a local exchange for the two calls after the handover is successful, because no additional The process of establishing a local exchange, realizing local exchange while switching, can save the process Execution time, and save the number of messages on the A interface. Moreover, since a separate process is not required to establish a local exchange, the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.

本发明的另一方面通过接收来自基站子***的要求切换的第五消息，根据所述要求切换的第五消息中携带的为构成会话的两个呼叫申请建立本地交换的信息，判断为所述两个呼叫建立本地交换的条件是否满足，并在满足时，发送指示执行切换操作的第六消息指示所述基站子***为所述两个呼叫建立本地交换。同样可以看出，所述建立本地交换的方法不需要增加额外的建立本地交换的流程，在切换的同时实现本地交换，因此可以节约流程的执行时间，并节约 A接口的消息数量。并且，由于不需要单独的流程建立本地交换，因此不会由于建立本地交换而对通话质量产生不利的影响，从而可以提高用户体验。 According to another aspect of the present invention, by receiving a fifth message requesting handover from the base station subsystem, establishing local exchange information for the two call requests constituting the session carried in the fifth message that is required to be switched, and determining that the message is Whether the conditions for the two calls to establish a local exchange are met, and when satisfied, a sixth message indicating that the handover operation is performed instructs the base station subsystem to establish a local exchange for the two calls. It can also be seen that the method for establishing a local exchange does not need to add an additional process of establishing a local exchange, and implements local exchange at the same time of the handover, thereby saving the execution time of the process and saving the number of messages of the A interface. Moreover, since a separate process is not required to establish a local exchange, the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.

本发明的再一方面在确定构成会话的两个呼叫位于基站子*** 且满足建立本地交换的条件时，向所述基站子***发送询问是否切换的第十消息，指示所述基站子***为所述两个呼叫建立本地交换，并在接收到来自基站子***的要求切换的第十一消息时，根据所述第十一消息中携带的为所述两个呼叫申请建立本地交换的信息，发送指示执行切换操作的第十二消息指示所述第三基站子***为所述两个呼叫建立本地交换。可见，所述建立本地交换的方法不需要增加额外的建立本地交换的流程，在切换的同时实现本地交换，因此可以节约流程的执行时间，并节约 A接口的消息数量。并且，由于不需要单独的流程建立本地交换，因此不会由于建立本地交换而对通话质量产生不利的影响，从而可以提高用户体验。 A further aspect of the present invention, when determining that two calls constituting a session are located in a base station subsystem and satisfying a condition for establishing a local exchange, transmitting a tenth message asking whether to switch to the base station subsystem, indicating that the base station subsystem is The two calls establish a local exchange, and when receiving the eleventh message requesting handover from the base station subsystem, establish local exchange information for the two call requests carried in the eleventh message, and send A twelfth message indicating that the handover operation is performed instructs the third base station subsystem to establish a local exchange for the two calls. It can be seen that the method for establishing a local exchange does not need to add an additional procedure for establishing a local exchange, and implements local exchange at the same time of the handover, thereby saving the execution time of the process and saving the number of messages of the A interface. Moreover, since a separate process is not required to establish a local exchange, the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.

附图说明图 1是现有技术中全球移动通信***示意图； BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a global mobile communication system in the prior art;

图 2是本发明实施例中建立本地交换的方法一的实施例一信令流程示意图； 2 is a signaling flow of Embodiment 1 of a method for establishing local switching in an embodiment of the present invention. Schematic diagram

图 3是本发明实施例中建立本地交换的方法一的实施例二信令流程示意图； 3 is a schematic diagram of a signaling flow of Embodiment 2 of a method 1 for establishing a local exchange according to an embodiment of the present invention;

图 4是本发明实施例中建立本地交换的方法二的实施例一信令流程示意图； 4 is a schematic diagram of a signaling flow of Embodiment 1 of a method 2 for establishing a local exchange in an embodiment of the present invention;

图 5是本发明实施例中建立本地交换的方法二的实施例二信令流程示意图； FIG. 5 is a schematic diagram of a signaling flow of Embodiment 2 of a method 2 for establishing a local exchange according to an embodiment of the present invention;

图 6是本发明实施例中 MSC实施例一结构示意图； 6 is a schematic structural diagram of Embodiment 1 of an MSC according to an embodiment of the present invention;

图 7是本发明实施例中 MSC实施例二结构示意图； 7 is a schematic structural diagram of Embodiment 2 of an MSC according to an embodiment of the present invention;

图 8是本发明实施例中 MSC实施例三结构示意图； 8 is a schematic structural diagram of Embodiment 3 of an MSC according to an embodiment of the present invention;

图 9是本发明实施例中 MSC实施例四结构示意图； 9 is a schematic structural diagram of Embodiment 4 of an MSC according to an embodiment of the present invention;

图 10是本发明实施例中 MSC实施例五结构示意图； 10 is a schematic structural diagram of Embodiment 5 of an MSC according to an embodiment of the present invention;

图 11是本发明实施例中 MSC实施例六结构示意图； 11 is a schematic structural diagram of Embodiment 6 of an MSC according to an embodiment of the present invention;

图 12是本发明实施例中 BSS实施例一结构示意图； FIG. 12 is a schematic structural diagram of Embodiment 1 of a BSS according to an embodiment of the present invention; FIG.

图 13是本发明实施例中 BSS实施例二结构示意图； 13 is a schematic structural diagram of a second embodiment of a BSS according to an embodiment of the present invention;

图 14是本发明实施例中 BSS实施例三结构示意图。 FIG. 14 is a schematic structural diagram of a third embodiment of a BSS according to an embodiment of the present invention.

具体实施方式下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

切换是指当通话中的移动台从一个小区进入另一个小区时，网络能够把移动台从原小区所用的信道切换到新小区的某一信道，而保证用户的通话不中断。切换包括不同 BSS控制区（Inter-BSS ) 内小区之间的切换及同一 BSS控制区（Intra-BSS ) 内不同小区之间的切换，本发明实施例能够分别实现在上述两种切换过程中建立本地交换。对应的称为 Inter-BSS间切换建立本地交换及 Intra-BSS间切换建立本地交换，以下分别进行详细说明。 Switching means that when a mobile station in a 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 of the new cell, and ensure that the user's call is not interrupted. The handover includes cells in different BSS control areas (Inter-BSS) The inter-switching and the switching between different cells in the same BSS control area (Intra-BSS) can respectively implement local switching in the above two handover procedures. The corresponding inter-BSS handover establishes local exchange and intra-BSS handover to establish local exchange, which will be described in detail below.

方法一、 Inter-BSS间切换建立本地交换：当接收到来自第一 BSS 的要求切换的第一消息时，判断切换完成后构成会话的两个呼叫都将位于第二 BSS且满足本地交换的条件时，向第二 BSS发送要求切换的第二消息，指示所述第二 BSS切换成功后为所述两个呼叫建立本地交换。为描述方便，本申请文件中采用第一消息、第二消息等描述方式，可以理解的是，所述第一消息、第二消息只是用于区分不同的消息，并不用于表示消息的功能或顺序。 Method 1: Inter-BSS handover establishes local exchange: When receiving the first message requesting handover from the first BSS, it is determined that two calls constituting the session after the handover is completed will be located in the second BSS and satisfy the condition of local exchange. And sending a second message requesting handover to the second BSS, indicating that the local exchange is established for the two calls after the second BSS is successfully switched. For the convenience of description, the first message, the second message, and the like are used in the description of the present application. It can be understood that the first message and the second message are only used to distinguish different messages, and are not used to indicate the function of the message or order.

为使本领域技术人员更好地理解和实现本发明，以下参照附图，通过具体实施例进行详细说明： In order to enable those skilled in the art to better understand and implement the present invention, the following detailed description

实施例一、切换过程中涉及移动台 MS1和 MS2, 切换前， MS1位于 BSS1， MS2位于 BSS2; 切换后， MS1和 MS2都位于 BSS2。参照图 2, 为本发明实施例中建立本地交换的方法一的实施例一信令流程示意图，具体包括如下内容。 Embodiment 1 In the handover process, the mobile stations MS1 and MS2 are involved. Before the handover, MS1 is located in BSS1, and MS2 is located in BSS2; after handover, both MS1 and MS2 are located in BSS2. Referring to FIG. 2, it is a signaling flow diagram of Embodiment 1 of a method for establishing a local exchange according to an embodiment of the present invention, which specifically includes the following content.

201、 BSS1向 MSC发送切换要求（ Handover Required ) 消息。 201. The BSS1 sends a Handover Required message to the MSC.

202、 MSC判断切换完成后， MS 1与 MS2所对应的两个呼叫都将位于 BSS2且所述两个呼叫满足本地交换的条件时，向 BSS2发送切换请求 ( Handover Request )消息， Handover Request消息中包含信元用于指示 BSS2切换成功后建立本地交换。 202. After the MSC determines that the two handovers corresponding to the MS1 and the MS2 are located in the BSS2 and the two calls meet the conditions of the local exchange, the MSC sends a Handover Request message to the BSS2, in the Handover Request message. The containing cell is used to indicate that the local exchange is established after the BSS2 handover succeeds.

MSC可以判断出哪些呼叫可以建立本地交换。例如， MSC可以通过记录构成会话的两个呼叫所在小区的小区标识（Cell-ID )，结合两个呼叫所使用的编解码及当前补充业务的要求，决定是否允许所述会话的两个呼叫建立本地交换。例如， MSC可以根据如下几个方面判断某两个呼叫是否可以建立本地交换。 The MSC can determine which calls can establish a local exchange. For example, the MSC can determine whether to allow two call setups of the session by recording the cell identity (Cell-ID) of the cell in which the two calls are formed, combining the codec used by the two calls and the current supplementary service requirements. Local exchange. For example, the MSC can determine whether a two-call can establish a local exchange according to the following aspects.

1 )建立本地交换的两个呼叫需要位于同一个 BSS。 1) Two calls to establish a local exchange need to be in the same BSS.

2 )建立本地交换的两个呼叫的编解码需要相同或兼容，或者两个呼叫的码变换器（TC ) 资源位于 BSC上。 2) The codec for establishing two calls for local exchange needs to be the same or compatible, or two The code converter (TC) resources of the calls are located on the BSC.

3 )对于补充业务，业务的属性不能与本地交换冲突。例如，对于呼叫等待、呼叫保持、多方通话等补充业务的属性与本地交换冲突，无法进行本地交换。 3) For supplementary services, the attributes of the service cannot conflict with the local exchange. For example, the attributes of supplementary services such as call waiting, call hold, and multi-party call conflict with the local exchange, and local exchange cannot be performed.

对于同一 MSC下的每个呼叫，可以采用某种标识手段，对其进行唯一标识。例如，可以采用呼叫标识（Call-ID )的信元进行标识。除了 Call-ID外，还可以采用其他方式，本申请文件所举方式并不对其构成限制。 For each call under the same MSC, it can be uniquely identified by some means of identification. For example, the cell of the call identifier (Call-ID) can be used for identification. In addition to the Call-ID, other methods may be used, and the manner in which this document is filed does not limit it.

MSC在判断出切换完成后，构成会话的两个呼叫都将位于 BSS2 时，可以通过信元指示 BSS2切换完成后建立本地交换，所述信元具体可以是：本地交换标志、 ( Local Switching Indicator )。列口： Local Switching Indicator设置为 1，表示 BSS2可以建立本地交换； Local Switching Indicator设置为 0，表示 BSS2不可以建立本地交换。 BSS2 可以根据 MSC的指示建立本地交换。 After the MSC determines that the two calls that constitute the session are located in the BSS2, the MSC can establish a local exchange after the BSS2 handover is completed by the cell. The cell may be: a Local Switching Indicator. . Column: The Local Switching Indicator is set to 1, indicating that BSS2 can establish local switching; the Local Switching Indicator is set to 0, indicating that BSS2 cannot establish local switching. BSS2 can establish a local exchange based on the indication of the MSC.

可见，本实施例中， MSC在接收到 BSS1的切换请求后，判断切换后构成会话的两个呼叫将位于 BSS2时，则指示 BSS2在切换完成后建立本地交换，所述建立本地交换的流程与切换流程同时进行，因此可以节约整个流程执行时间，同时，由于建立交换的指示采用切换流程中的消息，因此可以节约 A接口的消息数量。由于避免了单独的建立本地交换的流程，因此可以减少对通话质量的影响，提高用户体验。 It can be seen that, in this embodiment, after receiving the handover request of the BSS1, the MSC determines that two calls constituting the session after the handover will be located in the BSS2, and instructs the BSS2 to establish a local exchange after the handover is completed, and the process of establishing the local exchange is performed. The switching process is performed at the same time, so that the execution time of the entire process can be saved. At the same time, the message in the switching process is used because the indication of establishing the exchange is used, so that the number of messages of the A interface can be saved. By eliminating the need to establish a separate local exchange process, the impact on call quality can be reduced and the user experience can be improved.

在实施过程中，还可以对上述建立本地交换的方法进行优化，以下通过另一具体实施例进行说明。 In the implementation process, the above method of establishing a local exchange may also be optimized, and the following is explained by another specific embodiment.

实施例二、在 Inter-BSS间切换过程中，参照图 3，为本发明实施例中建立本地交换的方法一的实施例二信令流程示意图。切换前， MS1位于 BSS1， MS2位于 BSS2; 切换后， MS1和 MS2都位于 BSS2。与实施例一的不同之处在于， BSS2在本地交换能够建立时，将在所述构成会话的两个呼叫切换成功后，执行本地交换的操作，并可利用切换完成消息中的某个信元通知 MSC本地交换的执行结果，而 MSC 在所述两个呼叫的本地交换建立成功时，可清除为所述两个呼叫所分配的核心网用户面资源，以下通过具体流程进行详细说明。 Embodiment 2 In the process of inter-BSS handover, referring to FIG. 3, it is a schematic diagram of a signaling flow of Embodiment 2 of the method 1 for establishing local exchange in the embodiment of the present invention. Before the handover, MS1 is located in BSS1, MS2 is located in BSS2; after handover, both MS1 and MS2 are located in BSS2. The difference from the first embodiment is that when the local exchange can be established, the BSS2 performs the local exchange operation after the two calls constituting the session are successfully switched, and can utilize a cell in the handover completion message. Notifying the MSC of the local exchange execution result, and the MSC clears the two calls when the local exchange establishment of the two calls is successful. The core network user plane resources are provided. The following detailed process is described in detail.

301、 BSS1向 MSC发送要求切换的切换要求（ Handover Required ) 消息。 301. The BSS1 sends a handover request (Handover Required) message to the MSC.

Handover Required消息中包含了 MS所要切换的小区列表，其中包括 BSS2的小区。 The Handover Required message contains a list of cells to be switched by the MS, including the cell of BSS2.

302、 MSC判断切换完成后， MS 1与 MS2所对应的两个呼叫都将位于 BSS2且所述两个呼叫满足本地交换的条件时，向 BSS2发送请求切换的切换请求 ( Handover Request )消息， Handover Request消息中包含信元用于指示 BSS2切换成功后可以建立本地交换。 302. After the MSC determines that the two calls corresponding to the MS1 and the MS2 are located in the BSS2 and the two calls satisfy the condition of the local exchange, the MSC sends a Handover Request message requesting handover to the BSS2, Handover The request message contains a cell for indicating that the local exchange can be established after the BSS2 handover succeeds.

MSC收到 Handover Required消息后，就开始向 BSS2发送 Handover Request消息，要求 BSS2分配无线资源。 After receiving the Handover Required message, the MSC starts to send a Handover Request message to BSS2, requesting BSS2 to allocate radio resources.

303、 BSS2向 MSC返回指示切换请求响应的切换请求确认 ( Handover Request Ack ) 消息，通过所述消息中的某个信元（例如，本地交换可行性 ( Local Switch Feasibility ) )告知 BSS当前是否支持本地交换，或者本地交换能否建立。 303. The BSS2 returns a Handover Request Ack message indicating a handover request response to the MSC, and uses a cell in the message (for example, Local Switch Feasibility) to notify the BSS whether the local support is currently supported. Exchange, or whether local exchange can be established.

BSS2为所述两个呼叫分配无线资源后，向 MSC返回 Handover Request Ack消息指示是否支持本地交换或本地交换能否建立。例如，设置 Local Switch Feasibility信元为 1表示支持建立本地交换，或本地交换可以建立；设置 Local Switch Feasibility信元为 0表示 BSS2不支持本地交换，或者本地交换无法建立。 After the BSS2 allocates radio resources to the two calls, it returns a Handover Request Ack message to the MSC to indicate whether local exchange or local exchange can be established. For example, setting the Local Switch Feasibility cell to 1 indicates that local switching is supported, or local switching can be established; setting the Local Switch Feasibility cell to 0 means that BSS2 does not support local switching, or local switching cannot be established.

304、 MSC在确认 BSS2能够建立本地交换时，向 BSS1发送指示执行切换操作的切换命令 ( Handover Command ) 消息，指示 BSS 1进行切换。 304. When the MSC confirms that the BSS2 can establish a local exchange, the MSC sends a Handover Command message indicating that the handover operation is performed to the BSS1, instructing the BSS 1 to switch.

MSC收到后，向 BSS1发送 Handover Command消息，具体为：通过 BSS1中的某个 BTS向 MS1发送 Handover Command消息，该命令中包含了由 BSS2分配的一个切换参考值，包括所分配信道的频率等信息。 MS1将其频率切换到新的频率点上，向 BSS2发送切换接入 (Handover Access)消息。 After receiving the MSC, the MSC sends a Handover Command message to the BSS1, specifically: sending a Handover Command message to the MS1 through a BTS in the BSS1, where the command includes a handover reference value allocated by the BSS2, including the frequency of the allocated channel, and the like. information. MS1 switches its frequency to a new frequency point and sends a Handover Access message to BSS2.

305、 BSS2向 MSC发送切换检测（ Handover Detect ) 消息。 BSS2检测 MSI的合法性，若合法， BSS2发送 Handover Detect 消息给 MSC。 305. The BSS2 sends a Handover Detect message to the MSC. BSS2 detects the validity of the MSI. If it is legal, BSS2 sends a Handover Detect message to the MSC.

306、 BBS2向 MSC发送指示切换完成的切换完成（ Handover Complete ) 消息， MSI与 BSS2正常通信。 306. The BBS2 sends a Handover Complete message indicating that the handover is completed to the MSC, and the MSI and the BSS2 communicate normally.

BSS2可以通过 Handover Complete消息中的某个信元，例如本地交换结果（Local Switch Result )信元指示本地交换是否建立成功。 BSS2 can indicate whether the local exchange is successfully established by using a cell in the Handover Complete message, such as a Local Switch Result cell.

根据 Handover Complete消息， MSC获知本地交换是否建立成功，如果 MSC得知本地交换建立成功，可清除为所述两个呼叫分配的核心网用户面资源；如果 MSC得知本地交换建立失败，则保留为所述两个呼叫分配的核心网用户面资源，继续执行现有的呼叫流程。 According to the Handover Complete message, the MSC learns whether the local exchange is successfully established. If the MSC learns that the local exchange establishment is successful, the MSC can allocate the core network user plane resources allocated for the two calls; if the MSC learns that the local exchange establishment fails, the MSC reserves the The core network user plane resources allocated by the two calls continue to execute the existing call flow.

MSC为所述两个呼叫分配的核心网用户面资源，根据 A接口的承载类型而有所不同。当 A接口的承载类型是时分复用（TDM, Time Division Multiplex )时， MSC为所述两个呼叫分配的核心网用户面资源包括所述两个呼叫的电路标识码（ CIC， Circuit Identifier Code )等；当 A接口的承载类型为网际协议（IP, Internal Protocol ) 时， MSC为所述两个呼叫分配的核心网用户面资源包括位于媒体网关（ MGW, Media Gateway )上的 IP连接端点（IP地址 +端口号）等。 The core network user plane resources allocated by the MSC for the two calls are different according to the type of the A interface. When the bearer type of the A interface is Time Division Multiplex (TDM), the core network user plane resources allocated by the MSC for the two calls include the circuit identification code (CIC) of the two calls. When the bearer type of the A interface is the Internet Protocol (IP), the core network user plane resources allocated by the MSC for the two calls include the IP connection endpoint (IP) located on the Media Gateway (MGW, Media Gateway). Address + port number) and so on.

在本地交换建立成功后， MSC释放为所述两个呼叫分配的核心网用户面资源，所述资源为与 A接口相关的资源，因此节约 A接口的传输资源。 After the local exchange is successfully established, the MSC releases the core network user plane resources allocated for the two calls, and the resources are resources related to the A interface, thereby saving the transmission resources of the A interface.

307、当 MSC收到 Handover Complete消息后，通过指示清除资源的清除命令 ( Clear Command ) 消息释放 BSS1内与 MSI相关的资源。 307. After receiving the Handover Complete message, the MSC releases the resources related to the MSI in the BSS1 by using a Clear Command message indicating the clearing of the resource.

其中 BSS1内与 MS1相关的资源包括相关的无线资源。 The resources related to MS1 in BSS1 include related radio resources.

308、 BSS1内与 MS1相关的资源释放完成后， BSS1向 MSC发送指示资源清除完成的清除完成（ Clear Complete ) 消息。 308. After the resource release related to the MS1 in the BSS1 is completed, the BSS1 sends a Clear Complete message indicating that the resource clearing is completed to the MSC.

至此，一次切换过程完成。 At this point, one switching process is completed.

可见，本实施例同样能够实现在切换的同时建立本地交换，从而可以节约 A接口的消息数量及处理流程的执行时间，并降低对通话质量的影响；更进一步，本实施例还可以在本地交换建立成功后，由 MSC释放为所述两个呼叫分配的核心网用户面资源，从而可以节约传输资源。 It can be seen that, in this embodiment, the local exchange can be established at the same time of the handover, so that the number of messages of the A interface and the execution time of the processing flow can be saved, and the impact on the call quality can be reduced. Further, the embodiment can also be locally switched. After the establishment is successful, The MSC releases the core network user plane resources allocated for the two calls, thereby saving transmission resources.

实施时，在步骤 303中，如果 BSS2发送的 Handover Request Ack 消息指示无法为所述两个呼叫建立本地交换时，可以继续执行现有的切换流程，也可以指示 BSS1和 BSS2释放所述两个呼叫。或者在切换流程结束后（即执行完步骤 308后）， MSC再指示 BSS2为所述两个呼叫建立本地交换。从而可以为所述两个呼叫建立本地交换，并在建立本地交换后，释放为所述两个呼叫分配的核心网用户面资源，以尽可能地节约 A接口资源。 In implementation, in step 303, if the Handover Request Ack message sent by the BSS2 indicates that the local exchange cannot be established for the two calls, the existing handover procedure may be continued, and the two calls may be instructed to be released by the BSS1 and the BSS2. . Or after the handover procedure ends (i.e., after step 308 is performed), the MSC instructs BSS2 to establish a local exchange for the two calls. Therefore, the local exchange can be established for the two calls, and after the local exchange is established, the core network user plane resources allocated for the two calls are released, so as to save the A interface resources as much as possible.

方法二、 Intra-BSS间切换建立本地交换： MSC接收来自第三 BSS 的要求切换的第五消息，所述第五消息中包含为构成会话的两个呼叫申请建立本地交换的信息；根据所述来自第三 BSS的第五消息，判断为所述两个呼叫建立本地交换的条件满足时，发送指示执行切换操作的第六消息指示所述第三 BSS为所述两个呼叫建立本地交换。为使本领域技术人员更好地理解和实现本发明，以下参照附图，通过具体实施例进行详细说明。 Method 2: Intra-BSS handover establishes local exchange: The MSC receives a fifth message requesting handover from the third BSS, where the fifth message includes information for establishing local exchange for two call requests constituting the session; And a fifth message from the third BSS, when it is determined that the condition for the two calls to establish the local exchange is satisfied, sending a sixth message indicating that the handover operation is performed, instructing the third BSS to establish a local exchange for the two calls. The invention will be described in detail below with reference to the accompanying drawings, in which FIG.

实施例一、 MS1与 MS2都位于某个 BSS (设为 BSS3 )中，但是没有建立本地交换。参照图 4，为本发明实施例中建立本地交换的方法二的实施例一信令流程示意图，以下通过具体步骤进行详细说明。 In the first embodiment, both MS1 and MS2 are located in a certain BSS (set to BSS3), but no local exchange is established. Referring to FIG. 4, it is a schematic diagram of a signaling flow of Embodiment 1 of a method for establishing a local exchange according to an embodiment of the present invention, which is described in detail below through specific steps.

401、 BSS3向 MSC发送表示要求切换的内部切换要求（ Internal Handover Required )消息，所述消息中携带申请建立本地交换的信息。 401. The BSS3 sends, to the MSC, an Internal Handover Required message indicating that the handover is requested, where the message carries information for establishing a local exchange.

所述消息中可以携带 MS 1与 MS2所对应呼叫的呼叫标识，分别设为 Call-ID1， Call-ID2, 申请为所述两个呼叫建立本地交换的信息。 The message may carry the call identifiers of the calls corresponding to the MS1 and the MS2, and are respectively set to Call-ID1 and Call-ID2, and apply for establishing local exchange information for the two calls.

例如，可以在消息设置本地交换标志（ Local Switch Indicator )信元，当 Local Switch Indicator信元设置为 1时，表示为呼叫 Call-IDl与 Call-ID2申请建立本地交换。 For example, a Local Switch Indicator cell can be set in the message. When the Local Switch Indicator cell is set to 1, it indicates that the call Call-ID1 and the Call-ID2 application establish a local exchange.

对于同一 MSC下的每个呼叫，可以采用某种标识手段，对其进行唯一标识。例如，可以采用呼叫标识（Call-ID )的信元进行标识。除了 Call-ID外，还可以采用其他方式，本申请文件所举方式并不对其构成限制。 For each call under the same MSC, it can be uniquely identified by some means of identification. For example, the cell of the call identifier (Call-ID) can be used for identification. In addition to the Call-ID, other methods can be used, and the method described in this application does not constitute Become a limit.

402、 MSC判断为所述两个呼叫建立本地交换的条件满足时，向 BSS3发送指示执行切换操作的内部切换命令（Internal Handover Command ) 消息，指示 BSS3为所述两个呼叫（ Call-ID 1和 Call-ID2 ) 建立本地交换。 402. When the MSC determines that the condition for establishing the local exchange of the two calls is satisfied, the MSC sends an Internal Handover Command message indicating that the handover operation is performed to the BSS3, indicating that the BSS3 is the two calls (Call-ID 1 and Call-ID2) Establish a local exchange.

MSC判断所述两个呼叫（ Call-ID 1与 Call-ID2 )是否满足建立本地交换的条件可以采取与方法一所述的技术方案中相同的技术手段。 The MSC determines whether the two calls (Call-ID 1 and Call-ID2) satisfy the condition for establishing a local exchange, and may adopt the same technical means as in the technical solution described in the first method.

例如，可以在 Internal Handover Command消息中设置本地交换标志 ( Local Switch Indicator )信元，当 Local Switch Indicator信元设置为 1时，表示为呼叫 Call-ID 1与 Call-ID2建立本地交换。 For example, a Local Switch Indicator cell can be set in the Internal Handover Command message. When the Local Switch Indicator cell is set to 1, it indicates that the call Call ID 1 establishes a local exchange with Call-ID2.

403、 BSS3向 MSC返回指示切换完成的切换完成（Handover Complete ) 消息。 403. The BSS3 returns a handover complete (Handover Complete) message indicating that the handover is completed to the MSC.

可以看出，本实施例中，在 MSC接收到的切换请求消息中包含为构成会话的两个呼叫申请建立本地交换的信息时，且所述两个呼叫建立本地交换的条件满足时，发送消息指示所述 BSS建立本地交换，从而可以实现在切换的同时建立本地交换，节约流程执行时间；同时，由于通过切换消息指示是否建立本地交换，不需要额外的本地交换消息，因此可以节约 A接口的消息数量；且本地交换与切换流程为同一流程，因此可以避免单独的本地交换处理流程对通话质量的影响，提高用户体验。 It can be seen that, in this embodiment, when the handover request message received by the MSC includes information for establishing local exchange for two call requests constituting the session, and the conditions for the two calls to establish local exchange are satisfied, the message is sent. Instructing the BSS to establish a local exchange, so that the local exchange can be established at the same time of the handover, which saves the process execution time. At the same time, since the handover message indicates whether the local exchange is established, no additional local exchange message is needed, so the interface A can be saved. The number of messages; and the local exchange and the handover process are the same process, so that the impact of the separate local exchange processing process on the call quality can be avoided, and the user experience is improved.

在具体实施例中，步骤 403中的 Handover Complete消息中可以携带信元（例如，本地交换结果（ Local Switch Result )信元 )指示本地交换的执行结果。如果本地交换建立成功， MSC可以清除为所述两个呼叫分配的核心网用户面资源，从而可以节约与^目关的 A接口的传输资源；在 BTS内本地交换情况下，还可以节约相关的 Abis接口传输资源。而如果本地交换建立失败，则保留为所述两个呼叫分配的核心网用户面资源，并继续执行后续的呼叫流程。 MSC在得知本地交换建立失败时，也可以切换完成后主动指示 BSS建立本地交换。 In a specific embodiment, the Handover Complete message in step 403 may carry a cell (for example, a Local Switch Result cell) to indicate the execution result of the local exchange. If the local exchange is successfully established, the MSC can clear the core network user plane resources allocated for the two calls, so that the transmission resources of the A interface can be saved; and the local exchange in the BTS can also save related information. The Abis interface transmits resources. If the local exchange establishment fails, the core network user plane resources allocated for the two calls are reserved, and the subsequent call flow is continued. When the MSC learns that the local exchange establishment fails, it can also actively instruct the BSS to establish a local exchange after the handover is completed.

在所述方法二的实施例一中，如果建立本地交换的条件不满足，则在执行步骤 401后，可以利用表示拒绝内部切换要求的内部切换要求拒绝（ Internal Handover Required Reject ) 消息拒绝 BSS3发起的切换流程，其原因值可以设为：不允许建立本地交换（Not allowed to establish Local Switch )。 In the first embodiment of the method 2, if the condition for establishing the local exchange is not satisfied, Then, after performing step 401, the handover procedure initiated by the BSS3 may be rejected by using an Internal Handover Required Reject message indicating that the internal handover request is rejected. The reason value may be set as: Not allowed to establish a local exchange (Not allowed to establish Local Switch ).

而如果 MSC发现两个呼叫位于同一 BSS且满足建立本地交换的条件，但是还未建立本地交换时， MSC也可以发起切换流程，以下通过具体实施例进行说明。 If the MSC finds that the two calls are located in the same BSS and the conditions for establishing the local exchange are met, but the local exchange has not been established, the MSC may also initiate a handover procedure, which is described below by way of a specific embodiment.

参照图 5，为本发明实施例中建立本地交换的方法二的实施例二信令流程示意图，以下通过具体步骤进行伴细说明： FIG. 5 is a schematic diagram of a signaling flow of Embodiment 2 of a method 2 for establishing a local exchange according to an embodiment of the present invention.

501、 MSC向 BSS3发送询问是否切换的内部切换询问（Internal Handover Enquiry )消息，所述消息中携带信元指示 BSS3为 MS 1与 MS2 对应的呼叫（设为 Call-ID1， Call-ID2 )建立本地交换。 501. The MSC sends an internal handover request (Internal Handover Enquiry) message to the BSS3, asking whether to switch, the message carrying the cell indicating that the BSS3 is a call corresponding to the MS1 and the MS2 (set to Call-ID1, Call-ID2) to establish a local exchange.

MSC预先判断呼叫 Call-IDl与 Call-ID2是否满足建立本地交换的条件可以采取与方法一所述的技术方案中相同的技术手段，不再赘述。并在满足本地交换的条件时，向 BSS3发送 Internal Handover Enquiry消息，指示 BSS3为呼叫 Call-ID 1与 Call-ID2建立本地交换。 Internal Handover Enquiry消息可以触发后续的切换流程。 The MSC pre-determines whether the call of Call-ID1 and Call-ID2 meets the conditions for establishing a local exchange, and may adopt the same technical means as in the technical solution described in the first method, and is not described again. And when the conditions of the local exchange are met, an Internal Handover Enquiry message is sent to the BSS3, instructing the BSS3 to establish a local exchange for the call Call-ID 1 and Call-ID2. The Internal Handover Enquiry message can trigger a subsequent handover process.

502、 BSS3向 MSC发送内部切换要求（ Internal Handover Required ) 消息，所述消息中包含为所述两个呼叫（Call-IDl与 Call-ID2 )申请建立本地交换的信息。 502. The BSS3 sends an Internal Handover Required message to the MSC, where the message includes information for establishing a local exchange for the two calls (Call-ID1 and Call-ID2).

503、 MSC判断为所述两个呼叫（Call-IDl与 Call-ID2 )建立本地交换的条件满足时，向 BSS3发送内部切换命令（Internal Handover Command ) 消息，指示 BSS3为所述两个呼叫（ Call-IDl和 Call-ID2 ) 建立本地交换。 503. When the MSC determines that the two calls (Call-ID1 and Call-ID2) establish a local exchange condition, the MSC sends an Internal Handover Command message to the BSS3, indicating that the BSS3 is the two calls. -IDl and Call-ID2) Establish local exchange.

504、 BSS3向 MSC返回切换完成（ Handover Complete ) 消息。在 Handover Complete消息中，可以携带信元（例如，本地交换结果（ Local Switch Result )信元 )指示本地交换的执行结果。如果本地交换建立成功， MSC可以清除为所述两个呼叫分配的核心网用户面资源，从而可以节约与之相关的 A接口的传输资源。而如果本地交换建立失败，则保留为所述两个呼叫分配的核心网用户面资源，并继续执行后续的呼叫流程。 MSC在得知本地交换建立失败时，也可以主动指示 BSS建立本地交换。 504. The BSS3 returns a Handover Complete message to the MSC. In the Handover Complete message, a cell (for example, a Local Switch Result cell) may be carried to indicate the execution result of the local exchange. If the local exchange is successfully established, the MSC can clear the core network user plane resources allocated for the two calls, thereby saving the transmission resources of the A interface related thereto. If the local exchange establishment fails, the core network user plane resources allocated for the two calls are reserved, and the subsequent call flow is continued. When the MSC learns that the local exchange establishment fails, the MSC may also actively instruct the BSS to establish a local exchange.

在所述方法二的实施例一中，如果建立本地交换的条件不满足，则在执行步骤 401后，可以利用内部切换要求拒绝（ Internal Handover Required Reject )消息拒绝 BSS3发起的切换流程，其原因值可以设为：不允许建立本地交换 ( Not allowed to establish Local Switch )。 In the first embodiment of the second method, if the condition for establishing the local exchange is not satisfied, after the step 401 is performed, the handover procedure initiated by the BSS3 may be rejected by using an Internal Handover Required Reject message. Can be set to: Not allowed to establish Local Switch.

可以看出，本实施例中由 MSC发送内部切换询问消息，触发切换流程，并在切换过程中，建立本地交换，因此可以节约流程执行时间，并且由于通过切换流程中的消息指示建立本地交换，因此可以节约 A 接口的消息数量。 It can be seen that, in this embodiment, the internal handover inquiry message is sent by the MSC, the handover process is triggered, and the local exchange is established in the handover process, so that the process execution time can be saved, and since the local exchange is established by the message in the handover process, Therefore, the number of messages of the A interface can be saved.

在具体实施中，当 MSC向 BSS3发送 Internal Handover Enquiry消息时，若所述消息中携带信元指示 BSS3为 MSI与 MS2对应的呼叫（设为 Call-ID1， Call-ID2 ) 建立本地交换，则 BSS3向 MSC发送 Internal Handover Required消息，所述消息中包含为所述两个呼叫（ Call-ID 1 与 Call-ID2 ) 申请建立本地交换的信息，此时， MSC不需要重复判断所述两个呼叫是否符合建立本地交换的条件，直接向 BSS3发送 Internal Handover Command消息，指示 BSS3为所述两个呼叫（ Call-IDl 和 Call-ID2 )建立本地交换，其他步骤与上述实施例类似，不再赘述。 In a specific implementation, when the MSC sends an Internal Handover Enquiry message to the BSS3, if the message carries a message indicating that the BSS3 is a call corresponding to the MSI and the MS2 (set to Call-ID1, Call-ID2) to establish a local exchange, the BSS3 Sending an Internal Handover Required message to the MSC, where the message includes information for establishing local exchange for the two calls (Call-ID 1 and Call-ID2), at this time, the MSC does not need to repeatedly determine whether the two calls are In accordance with the conditions for establishing the local exchange, the internal Handover Command message is directly sent to the BSS3, and the BSS3 is instructed to establish a local exchange for the two calls (Call-ID1 and Call-ID2). The other steps are similar to the foregoing embodiment, and are not described again.

可以理解的是，本申请文件所举实施例并不用于限制本发明，例如，对建立本地交换流程中所采用的消息并不限定上述消息构成，消息构成（包括信元结构）可以在实现信息传递的基础上进行灵活定义。 It should be understood that the embodiments of the present application are not intended to limit the present invention. For example, the message used in establishing the local exchange process does not limit the message composition, and the message composition (including the cell structure) may be implemented in the message. Flexible definition based on delivery.

以上对本发明实施例中建立本地交换的方法进行了详细的描述，为使本领域技术人员更好地理解和实现本发明，以下参照附图，对本发明实施例中的 MSC进行对应描述。参照图 6，为本发明实施例中 MSC实施例一结构示意图，所述 MSC可以用于在 Inter-BSS间切换时建立本地交换，具体包括：第一接收单元 601、第一判断单元 602和第一发送单元 603。 The MSCs in the embodiments of the present invention are described in detail in the following description. FIG. 6 is a schematic structural diagram of Embodiment 1 of an MSC according to an embodiment of the present invention. The MSC may be used to establish a local exchange when inter-BSS handover, and specifically includes: a first receiving unit 601, a first determining unit 602, and a A transmitting unit 603.

第一接收单元 601接收来自第一 BSS的消息，所述消息包括要求切换的第一消息；第一判断单元根据所述第一接收单元 601接收到的第一消息，判断切换完成后构成会话的两个呼叫是否位于第二 BSS且满足本地交换的条件；第一发送单元 603向第二 BSS发送消息，所述消息包括：在切换完成后所述两个呼叫都将位于第二 BSS且满足本地交换的条件时，指示所述第二 BSS切换成功后为所述两个呼叫建立本地交换的请求切换的第二消息。 The first receiving unit 601 receives the message from the first BSS, where the message includes the first message requesting the handover; the first determining unit determines, according to the first message received by the first receiving unit 601, that the session is completed after the handover is completed. Whether the two calls are located in the second BSS and meet the conditions of the local exchange; the first sending unit 603 sends a message to the second BSS, where the message includes: after the handover is completed, the two calls will be located in the second BSS and meet the local And the second message of the request switching of the local exchange is established for the two calls after the second BSS is successfully switched.

MSC可以判断出哪些呼叫可以建立本地交换。例如， MSC可以通过记录构成会话的两个呼叫所在小区的小区标识（Cell-ID )，结合两个呼叫所使用的编解码及当前补充业务的要求，决定是否允许所述会话的两个呼叫建立本地交换。 The MSC can determine which calls can establish a local exchange. For example, the MSC can determine whether to allow two call setups of the session by recording the cell identity (Cell-ID) of the cell in which the two calls are formed, combining the codec used by the two calls and the current supplementary service requirements. Local exchange.

可见，本实施例所述的 MSC在接收到来自第一 BSS的要求切换第一消息时，判断切换完成后构成会话的两个呼叫是否位于第二 BSS且满足本地交换的条件，并在切换完成后所述两个呼叫都将位于所述第二 BSS且满足本地交换的条件时，发送请求切换的第二消息指示所述第二 BSS切换成功后为所述两个呼叫建立本地交换。可以看出，所述建立本地交换是在切换过程中完成的，因此可以节约整个流程的执行时间，同时，由于建立本地交换的指示是通过切换流程中的消息实现的，因此可以节约 A接口的消息数量。 It can be seen that, when receiving the request to switch the first message from the first BSS, the MSC in this embodiment determines whether the two calls constituting the session are located in the second BSS after the completion of the handover and meet the conditions of the local exchange, and complete the handover. After the two calls are both located in the second BSS and meet the conditions of the local exchange, the second message sending the request handover indicates that the second BSS is successfully switched to establish a local exchange for the two calls. It can be seen that the establishment of the local exchange is completed in the handover process, so that the execution time of the entire process can be saved. At the same time, since the indication of establishing the local exchange is implemented by switching the message in the process, the A interface can be saved. The number of messages.

参照图 7，为本发明实施例中 MSC实施例二结构示意图，与 MSC 实施例一的不同之处在于， MSC700在 MSC实施例一基上，还包括：第二接收单元 701和第一资源管理单元 702。第二接收单元 701，用于接收来自第二 BSS的消息，所述消息包括指示切换完成的第三消息，所述第三消息包含指示本地交换是否建立成功的消息；第一资源管理单元 702，用于在第二接收单元 701接收到的第三消息包含指示本地交换建立成功的信息时，清除为所述两个呼叫分配的核心网用户面资源；还可以在第二接收单元 701接收到的第三消息包含指示本地交换建立失败的信息时，保留为所述两个呼叫分配的核心网用户面资源。 FIG. 7 is a schematic structural diagram of a second embodiment of an MSC according to an embodiment of the present invention. The MSC 700 is different from the MSC embodiment. The MSC 700 further includes: a second receiving unit 701 and a first resource management. Unit 702. The second receiving unit 701 is configured to receive a message from the second BSS, where the message includes a third message indicating that the handover is complete, and the third message includes a message indicating whether the local exchange is successfully established. The first resource management unit 702, The core network user plane resource allocated for the two calls is cleared when the third message received by the second receiving unit 701 includes information indicating that the local exchange establishment is successful; and may also be received by the second receiving unit 701. When the third message contains information indicating that the local exchange establishment fails, the core network user plane resources allocated for the two calls are reserved.

MSC为所述两个呼叫分配的核心网用户面资源，根据 A接口的承载类型而有所不同。当 A接口的承载类型是 TDM时， MSC为所述两个呼叫分配的核心网用户面资源包括所述两个呼叫的 CIC等；当 A接口的^^载类型为 IP时， MSC为所述两个呼叫分配的核心网用户面资源包括位于 MGW上的 IP连接端点（IP地址 +端口号）等。 The core network user plane resources allocated by the MSC for the two calls are different according to the type of the A interface. When the bearer type of the A interface is TDM, the core network user plane resources allocated by the MSC for the two calls include the CIC of the two calls, etc.; when the type of the A interface is IP, the MSC is the The core network user plane resources allocated for the two calls include the IP connection endpoint (IP address + port number) located on the MGW.

在建立本地交换后，清除为构成会话的两个呼叫所分配的核心网用户面资源，可以节约 A接口的传输资源。 After the local exchange is established, the core network user plane resources allocated for the two calls constituting the session are cleared, which can save the transmission resources of the A interface.

在具体实施中，第二接收单元 701接收到的消息中还可包括指示切换请求响应的第四消息，所述第四消息包含指示第二 BSS无法建立本地交换的信息；对应的，第一发送单元 603发送的消息还可包括：在第二接收单元 701接收到第四消息包含第二 BSS无法建立本地交换的信息时，指示所述第一 BSS和第二 BSS释放所述两个呼叫的消息；或者在第二接收单元 701接收到的第四消息包含第二 BSS无法为所述两个呼叫建立本地交换的信息时，待切换完成后指示所述第二 BSS建立本地交换的消息。从而可以为所述两个呼叫建立本地交换，并在建立本地交换后，释放为所述两个呼叫分配的核心网用户面资源，以尽可能地节约 A接口资源。 In a specific implementation, the message received by the second receiving unit 701 may further include a fourth message indicating a handover request response, where the fourth message includes information indicating that the second BSS cannot establish a local exchange; corresponding, the first sending The message sent by the unit 603 may further include: when the second receiving unit 701 receives the fourth message that the second BSS cannot establish the information of the local exchange, the first BSS and the second BSS are instructed to release the message of the two calls. Or, when the fourth message received by the second receiving unit 701 includes information that the second BSS cannot establish local exchange for the two calls, after the handover is completed, the second BSS is instructed to establish a locally exchanged message. Therefore, the local exchange can be established for the two calls, and after the local exchange is established, the core network user plane resources allocated for the two calls are released, so as to save the A interface resources as much as possible.

参照图 8，为本发明实施例中 MSC实施例三结构示意图，所述 MSC可以用于在 Intra-BSS间切换时建立本地交换，具体包括：第三接收单元 801、第二判断单元 802和第二发送单元 803。 FIG. 8 is a schematic structural diagram of Embodiment 3 of an MSC according to an embodiment of the present invention. The MSC may be used to establish a local exchange when switching between Intra-BSS, and specifically includes: a third receiving unit 801, a second determining unit 802, and a Two transmitting unit 803.

第三接收单元 801，用于接收来自第三 BSS的消息，所述消息包括要求切换的第五消息，所述第五消息中包含为第三 BSS中构成会话的两个呼叫申请建立本地交换的信息；第二判断单元 802，用于根据所述来自第三 BSS的第五消息，判断为所述两个呼叫建立本地交换的条件是否满足；第二发送单元 803，用于向第三 BSS发送消息，所述消息包括：第二判断单元 802判断为所述两个呼叫建立本地交换的条件满足时，指示执行切换操作的第六消息，所述第六消息包含指示所述第三 BSS为所述两个呼叫建立本地交换的信息。 The third receiving unit 801 is configured to receive a message from the third BSS, where the message includes a fifth message requesting handover, where the fifth message includes a session formed in the third BSS The two call requests establish the locally exchanged information; the second determining unit 802 is configured to determine, according to the fifth message from the third BSS, whether the condition for establishing the local exchange of the two calls is satisfied; the second sending unit 803. The message is sent to the third BSS, where the message includes: when the second determining unit 802 determines that the condition that the two calls establish local exchange is satisfied, the sixth message indicating that the handover operation is performed, the sixth message Contains information indicating that the third BSS establishes a local exchange for the two calls.

所述 MSC可以判断出哪些呼叫可以建立本地交换。例如， MSC 可以通过记录构成会话的两个呼叫所在小区的小区标识（ Cell-ID )，结合两个呼叫所使用的编解码及当前补充业务的要求，决定是否允许所述会话的两个呼叫建立本地交换。 The MSC can determine which calls can establish a local exchange. For example, the MSC can determine whether to allow two call setups of the session by recording the cell identity (Cell-ID) of the cell in which the two calls constituting the session are located, combining the codec used by the two calls and the current supplementary service requirements. Local exchange.

且所述 MSC可以对本 MSC下的每个呼叫，采用某种标识手段，对其进行唯一标识。例如，可以采用呼叫标识（Call-ID )的信元进行标识。除了 Call-ID外，还可以采用其他方式，本申请文件所举方式并不对其构成限制。 And the MSC can uniquely identify each call under the MSC by using some means of identification. For example, a cell with a call identifier (Call-ID) can be used for identification. In addition to the Call-ID, other methods may be used, and the manner in which this document is filed does not limit it.

可见，所述 MSC在接收到第三 BSS发送的申请为构成会话的两个呼叫建立本地交换的要求切换的第五消息时，判断所述两个呼叫是否满足本地交换的条件，并在满足本地交换的条件时，发送指示执行切换操作的第六消息指示第三 BSS为所述两个呼叫建立本地交换，可以看出，所述 MSC能够实现在切换的过程中建立本地交换，由于不需要单独的本地交换建立流程，因此可以节约流程执行时间，且由于采用切换流程中的消息指示是否建立本地交换，因此可以节约 A接口的消息数量。而建立本地交换与切换流程同时执行，也避免了建立本地交换单独流程单独执行时对切换质量产生影响，因此可以提高用户体验。 It can be seen that, when receiving the fifth message requesting handover of the local exchange for the two calls constituting the session, the MSC determines whether the two calls meet the condition of the local exchange, and satisfies the local condition. When the condition of the exchange is sent, the sixth message indicating that the handover operation is performed is instructed that the third BSS establishes a local exchange for the two calls. It can be seen that the MSC can implement local exchange during the handover process, since no separate The local exchange establishment process can save the process execution time, and the number of messages of the A interface can be saved because the message in the handover process is used to indicate whether the local exchange is established. The establishment of the local exchange and handover process is performed at the same time, which also avoids the impact on the quality of the handover when the separate process of establishing the local exchange is performed separately, so that the user experience can be improved.

参照图 9，为本发明实施例中 MSC实施例四结构示意图，与 MSC 实施例三的不同之处在于， MSC实施例四中还包括第二资源管理单元 FIG. 9 is a schematic structural diagram of a fourth embodiment of an MSC according to an embodiment of the present invention, which is different from the third embodiment of the MSC, where the second resource management unit is further included in the fourth embodiment of the MSC.

901 901

所述第三接收单元 801接收到的消息中还包括指示切换完成的第七消息，所述第七消息包含所述第三 BSS为所述两个呼叫建立本地交换是否成功的信息；对应的，所述第二资源管理单元 901用于在所述第七消息中包含所述第三 BSS为所述两个呼叫建立本地交换成功的信息时，清除为所述两个呼叫所分配的核心网用户面资源；还可用于在所述第七消息中包含所述第三 BSS为所述两个呼叫建立本地交换失败的信息时，保留为所述两个呼叫所分配的核心网用户面资源。 The message received by the third receiving unit 801 further includes a seventh message indicating that the handover is complete, and the seventh message includes the third BSS establishing a local handover for the two calls. Corresponding to the success of the information; correspondingly, the second resource management unit 901 is configured to: when the third BSS includes the information that the third BSS establishes a local exchange success for the two calls, The core network user plane resource allocated by the two calls; and may be further configured to: when the third BSS includes the information that the local BSS fails to establish a local exchange for the two calls, The assigned core network user plane resources.

所述 MSC为所述两个呼叫分配的核心网用户面资源，根据 A接口的承载类型而有所不同。当 A接口的承载类型是 TDM时， MSC为所述两个呼叫分配的核心网用户面资源包括所述两个呼叫的 CIC等；当 A 接口的承载类型为 IP时， MSC为所述两个呼叫分配的核心网用户面资源包括位于 MGW上的 IP连接端点（ IP地址 +端口号）等。 The core network user plane resources allocated by the MSC for the two calls are different according to the bearer type of the A interface. When the bearer type of the A interface is TDM, the core network user plane resources allocated by the MSC for the two calls include the CICs of the two calls, etc. When the bearer type of the A interface is IP, the MSC is the two The core network user plane resources of the call distribution include the IP connection endpoint (IP address + port number) located on the MGW.

在为所述两个呼叫建立本地交换后，通过清除为所述两个呼叫分配的核心网用户面资源，可以节约 A接口传输资源，在 BTS内本地交换情况下，还可以节约 Abis接口传输资源。 After the local exchange is established for the two calls, the A-interface transmission resource can be saved by clearing the core network user plane resources allocated for the two calls, and the Abis interface transmission resource can be saved under the local exchange in the BTS. .

而且，第二发送单元 803发送的消息中还可包括：在所述第二判断单元 802判断为所述两个呼叫建立本地交换的条件不满足时，向所述第三 BSS发送的拒绝为所述两个呼叫建立本地交换的切换请求的指示拒绝切换请求的第八消息。 Moreover, the message sent by the second sending unit 803 may further include: when the second determining unit 802 determines that the condition that the two calls establish local exchange is not satisfied, the rejection sent to the third BSS is The indication that the two calls establish a locally switched handover request rejects the eighth message of the handover request.

参照图 10，为本发明实施例中 MSC实施例五结构示意图，在 MSC 实施例三或四基石出上，图 10中以在 MSC实施例四基石出上进行扩展为例进行说明，还可包括：第三判断单元 1001，用于判断所述两个呼叫是否位于同一个基站子***且满足建立本地交换的条件，且没有建立本地交换。 10 is a schematic structural diagram of a fifth embodiment of an MSC according to an embodiment of the present invention. The MSC embodiment is extended on the basis of the fourth embodiment of the MSC embodiment, and is further illustrated in FIG. The third determining unit 1001 is configured to determine whether the two calls are located in the same base station subsystem and meet the condition for establishing a local exchange, and the local exchange is not established.

第二发送单元 803发送的消息还包括：在第三判断单元 1001确定所述二个呼叫位于第三 BSS且满足建立本地交换的条件，且没有建立本地交换时，向所述第三 BSS发送的询问是否切换的第九消息，所述第九消息包含指示所述第三 BSS为所述两个呼叫建立本地交换的信参照图 11，为本发明实施例中 MSC实施例五结构示意图，该 MSC 包括：第四判断单元 1101、第三发送单元 1102和第四接收单元 1103。其中：第四判断单元 1101，用于判断构成会话的两个呼叫是否位于第三 BSS, 且满足本地交换建立的条件，且未建立本地交换；第三发送单元 1102，用于向第三 BSS发送消息，所述消息包括：在第四判断单元 1101判断所述构成会话的两个呼叫均位于第三 BSS, 且满足本地交换建立的条件时，向所述第三 BSS发送的询问是否切换的第十消息，所述第十消息包含指示所述第三 BSS为所述两个呼叫建立本地交换的信息；根据第四接收单元 1103接收到的第十一消息，发送的指示执行切换操作的第十二消息，所述第十二消息包含指示所述第三 BSS为所述两个呼叫建立本地交换的信息。第四接收单元 1103，用于接收来自第三 BSS的消息，所述消息包括要求切换的第十一消息，所述第十一消息包含为所述两个呼叫申请建立本地交换的信息。 The message sent by the second sending unit 803 further includes: when the third determining unit 1001 determines that the two calls are located in the third BSS and meets the condition for establishing a local exchange, and does not establish a local exchange, sends the message to the third BSS. Querying whether the ninth message is switched, the ninth message includes a message indicating that the third BSS establishes a local exchange for the two calls. Referring to FIG. 11, FIG. 11 is a schematic structural diagram of Embodiment 5 of an MSC according to an embodiment of the present invention. The method includes: a fourth determining unit 1101, a third transmitting unit 1102, and a fourth receiving unit 1103. The fourth determining unit 1101 is configured to determine whether the two calls constituting the session are located in the third BSS, and satisfy the condition of the local exchange establishment, and the local exchange is not established; the third sending unit 1102 is configured to send the third call to the third BSS. The message includes: when the fourth determining unit 1101 determines that both calls constituting the session are located in the third BSS, and the condition of the local exchange establishment is satisfied, whether the inquiry sent to the third BSS is switched Tenth message, the tenth message includes information indicating that the third BSS establishes local exchange for the two calls; according to the eleventh message received by the fourth receiving unit 1103, the tenth indication that the switching operation is performed is sent The second message, the twelfth message includes information indicating that the third BSS establishes a local exchange for the two calls. The fourth receiving unit 1103 is configured to receive a message from the third BSS, where the message includes an eleventh message requesting handover, and the eleventh message includes information for establishing local exchange for the two call requests.

可见，本实施例所述的 MSC在确定构成会话的两个呼叫位于第三 BSS且满足建立本地交换的条件时，向所述第三 BSS发送询问是否切换的第十消息，指示所述第三 BSS为所述两个呼叫建立本地交换，并在接收到来自第三 BSS的要求切换的第十一消息时，根据所述第十一消息中携带的为所述两个呼叫申请建立本地交换的信息，发送指示执行切换操作的第十二消息指示所述第三 BSS为所述两个呼叫建立本地交换。可见，所述建立本地交换的方法不需要增加额外的建立本地交换的流程，在切换的同时实现本地交换，因此可以节约流程的执行时间，并节约 A接口的消息数量。并且，由于不需要单独的流程建立本地交换，因此不会由于建立本地交换而对通话质量产生不利的影响，从而可以提高用户体验。 It can be seen that, when determining that two calls constituting a session are located in the third BSS and satisfying the condition for establishing a local exchange, the MSC in the embodiment sends a tenth message asking whether to switch, to the third BSS, indicating the third The BSS establishes a local exchange for the two calls, and establishes a local exchange for the two call requests carried in the eleventh message when receiving the eleventh message requesting the handover from the third BSS. Information, transmitting a twelfth message indicating that the handover operation is performed instructing the third BSS to establish a local exchange for the two calls. It can be seen that the method for establishing a local exchange does not need to add an additional process for establishing a local exchange, and implements local exchange at the same time of the handover, thereby saving the execution time of the process and saving the number of messages of the A interface. Moreover, since a separate process is not required to establish a local exchange, the quality of the call is not adversely affected by establishing a local exchange, thereby improving the user experience.

以下参照附图，对本发明实施例中建立本地交换过程中所涉及的 BSS进行对应描述： The following describes the BSS involved in establishing the local exchange process in the embodiment of the present invention with reference to the accompanying drawings:

参照图 12，为本发明实施例中 BSS实施例一结构示意图，该 BSS 包括：第一接收单元 1201和第一本地交换建立单元 1202。其中：第一接收单元 1201，用于接收来自核心网侧的消息，所述消息包括要求切换的第一消息，所述第一消息中包含指示切换成功后为构成会话的两个呼叫建立本地交换的信息；第一本地交换建立单元 1202，用于根据第一接收单元 1201接收到的第一消息，为所述两个呼叫建立本地交换。 FIG. 12 is a schematic structural diagram of Embodiment 1 of a BSS according to an embodiment of the present invention. The BSS includes: a first receiving unit 1201 and a first local exchange establishing unit 1202. The first receiving unit 1201 is configured to receive a message from a core network side, where the message includes a first message requesting a handover, where the first message includes indicating that the handover is successful, and establishing a local exchange for two calls constituting the session. Information; a first local exchange establishing unit 1202, configured to The first message received by the first receiving unit 1201 establishes a local exchange for the two calls.

可以看出，所述 BSS在接收到来自核心网侧的要求切换的第一消息时， ^^据第一消息中携带的切换成功后为构成会话的两个呼叫建立本地交换的指示信息，为所述两个呼叫建立本地交换。因此，该 BSS 能够同时实现切换与本地交换，从而可以节约流程执行时间。同时，由于使用切换流程中的消息携带指示是否建立本地交换的信息，因此可以节约 A接口的消息数量。而切换与本地交换同时执行也避免了切换与本地交换分别执行时对通话质量的影响，从而可以提高用户体验。 It can be seen that, when receiving the first message requesting handover from the core network side, the BSS establishes local exchange indication information for the two calls constituting the session according to the handover successfully carried in the first message. The two calls establish a local exchange. Therefore, the BSS can implement switching and local switching at the same time, thereby saving process execution time. At the same time, since the message in the handover process carries information indicating whether to establish local exchange, the number of messages of the A interface can be saved. The simultaneous execution of the handover and the local exchange also avoids the impact on the quality of the call when the handover and the local exchange are performed separately, thereby improving the user experience.

所述 BSS的适用场景为： Inter-BSS间切换建立本地交换的过程，例如，切换前处于不同 BSS的两个呼叫，切换后位于同一 BSS, 且满足本地交换的条件时，所述 BSS即可为所述两个呼叫建立本地交换。 The applicable scenario of the BSS is as follows: Inter-BSS handover establishes a local exchange process, for example, two calls in different BSSs before handover, and are located in the same BSS after handover, and meet the conditions of local exchange, the BSS can A local exchange is established for the two calls.

在具体实施中，上述 BSS还可进一步优化，以一个具体实施例进行说明。 In a specific implementation, the above BSS can be further optimized and described in a specific embodiment.

参照图 13，为本发明实施例中 BSS实施例二结构示意图，在 BSS 实施例一实施例基上，扩展第一发送单元 1301，用于向核心网侧发送消息，包括在第一本地交换建立单元 1202为所述两个呼叫建立本地交换后，向核心网侧发送的指示切换完成的第三消息，所述第三消息包含为所述两个呼叫建立本地交换是否成功的信息，使得核心网侧在本地交换建立成功时清除为所述两个呼叫分配的核心网用户面资源，或者在本地交换建立失败时保留为所述两个呼叫分配的核心网用户面资源。 FIG. 13 is a schematic structural diagram of a second embodiment of a BSS according to an embodiment of the present invention. On the basis of an embodiment of the BSS embodiment, the first sending unit 1301 is configured to send a message to the core network, including establishing in the first local exchange. After the local exchange is performed on the two calls, the unit 1202 sends a third message to the core network side indicating that the handover is complete, and the third message includes information about whether the local exchange is successful for the two calls, so that the core network The side clears the core network user plane resources allocated for the two calls when the local exchange establishment is successful, or reserves the core network user plane resources allocated for the two calls when the local exchange establishment fails.

本实施例所介绍的 BSS在本地交换建立成功后，通过向核心网侧发送本地交换建立成功的消息，指示核心网清除为所述两个呼叫分配的核心网用户面资源，可以节省相关的 A接口传输资源。 After the local exchange is successfully established, the BSS introduced in the embodiment can send a local exchange establishment success message to the core network to instruct the core network to clear the core network user plane resources allocated for the two calls, thereby saving related A. Interface transmission resources.

参照图 14，为本发明实施例中 BSS实施例三结构示意图， BSS1400 包括：第二发送单元 1401、第二接收单元 1402和第二本地交换建立单元 1403。其中：第二发送单元 1401，用于向核心网侧发送消息，所述消息中包括要求切换的第五消息，所述第五消息中包含为构成会话的两个呼叫申请建立本地交换的信息；第二接收单元 1402，用于接收来自所述核心网侧的消息，所述消息中包括指示执行切换操作的第六消息，所述第六消息包含为所述两个呼叫建立本地交换的指示信息；第二本地交换建立单元 1403，用于根据所述第二接收单元 1403接收到的第六消息中携带的指示为所述两个呼叫建立本地交换的指示信息，为所述两个呼叫建立本地交换。 14 is a schematic structural diagram of a third embodiment of a BSS according to an embodiment of the present invention. The BSS 1400 includes: a second sending unit 1401, a second receiving unit 1402, and a second local switching establishing unit 1403. The second sending unit 1401 is configured to send a message to the core network side, where The message includes a fifth message requesting to switch, the fifth message includes information for establishing a local exchange for two call requests constituting the session, and a second receiving unit 1402, configured to receive a message from the core network side. The message includes a sixth message indicating that the handover operation is performed, the sixth message includes indication information for establishing a local exchange for the two calls, and a second local exchange establishing unit 1403, configured to be used according to the second receiving unit 1403. The indication carried in the received sixth message establishes local exchange indication information for the two calls, and establishes local exchange for the two calls.

可以看出，所述 BSS首先向核心网侧发送要求切换的第五消息申请建立本地交换，在接收到来自核心网侧的第六消息时，根据所述第六消息中携带的切换成功后为构成会话的两个呼叫建立本地交换的指示信息，为所述两个呼叫建立本地交换。因此，该 BSS能够同时实现切换与本地交换，从而可以节约流程执行时间。同时，由于使用切换流程中的消息携带指示是否建立本地交换的信息，因此可以节约 A 接口的消息数量。而切换与本地交换同时执行也避免了切换与本地交换分别执行时对通话质量的影响，从而可以提高用户体验。 It can be seen that the BSS first sends a fifth message requesting handover to the core network side to establish a local exchange, and after receiving the sixth message from the core network side, according to the handover succeeded in the sixth message, The two calls making up the session establish indications of local exchanges, establishing a local exchange for the two calls. Therefore, the BSS can implement switching and local switching at the same time, thereby saving process execution time. At the same time, since the message in the switching process carries information indicating whether to establish local exchange, the number of messages of the A interface can be saved. The simultaneous execution of the handover and the local exchange also avoids the impact on the quality of the call when the handover and the local exchange are performed separately, thereby improving the user experience.

所述 BSS的适用场景为： Intra-BSS间切换建立本地交换的过程，例如，切换前后两个呼叫始终位于相同的 BSS, 且满足本地交换的条件时，所述 BSS即可为所述两个呼叫建立本地交换。 The applicable scenario of the BSS is as follows: Intra-BSS handover establishes a local exchange process. For example, when two calls are always located in the same BSS before and after the handover, and the conditions of the local exchange are met, the BSS may be the two The call establishes a local exchange.

在具体实施中，可以对所述 BSS进行扩展，例如：第二发送单元 1401发送的消息还包括：在为所述两个呼叫建立本地交换成功时，向所述核心网侧发送的指示切换完成的第七消息，所述第七消息包含为所述两个呼叫建立本地交换成功的指示信息，使得核心网侧清除为所述两个呼叫分配的核心网用户面资源。 In a specific implementation, the BSS may be extended. For example, the message sent by the second sending unit 1401 further includes: when the local exchange is successfully established for the two calls, the indication sent to the core network side is completed. The seventh message, the seventh message includes indication information that the local exchange is successful for the two calls, so that the core network side clears the core network user plane resources allocated for the two calls.

本实施例所介绍的 BSS在本地交换建立成功后，通过向核心网侧发送本地交换建立成功的消息，指示核心网清除为所述两个呼叫分配的核心网用户面资源，在 TDM模式下，可以节省相关的 A接口传输资源，对于 BTS内的本地交换，还可以节约 Abis接口传输资源。 After the local exchange is successfully established, the BSS in the embodiment sends a message indicating that the local exchange is successfully established to the core network, and instructs the core network to clear the core network user plane resources allocated for the two calls. In the TDM mode, The related A interface transmission resources can be saved, and the local exchange in the BTS can also save the Abis interface transmission resources.

第二接收单元 1402接收到的消息中还可包括来自核心网侧的建立本地交换的询问是否切换的第九消息，所述第九消息包含指示所述基站子***为所述两个呼叫建立本地交换的指示信息；对应的，第二发送单元 1401在第二接收单元 1402接收到所述建立本地交换的第九消息时，发送所述要求切换的第五消息。 The message received by the second receiving unit 1402 may further include a ninth message from the core network side to establish whether the local exchange inquiry is to be switched, and the ninth message includes the indication The base station subsystem establishes the local exchange indication information for the two calls. Correspondingly, the second sending unit 1401 sends the request to switch when the second receiving unit 1402 receives the ninth message for establishing the local exchange. Five news.

以上通过全球移动通信*** （GSM, Global System for Mobile Communications ) 中的具体应用进行了详细的说明，可以理解的是，本发明实施例中介绍的建立本地交换的方法同样可以应用于宽带码分多址（ WCDMA, Wideband Code Division Multiple Access )、时分同步码分多址（ TD-SCDMA, Time Division Synchronous Code Division Multiple Access )和长期演进网络 ( LTE, Long Term Evolution ) 以及其他无线通信***中，而所对应的设备则为***中对应的核心网设备 (如： MSC服务器）及基站子***（具体可以是无线网络控制器（ RNC ( Radio Network Controller )或基站（ NodeB ) )。不再——举例说明。 The above is described in detail by the specific application in the Global System for Mobile Communications (GSM). It can be understood that the method for establishing local exchange introduced in the embodiment of the present invention can also be applied to the wideband code division. (WCDMA, Wideband Code Division Multiple Access), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), and other wireless communication systems. The corresponding device is the corresponding core network device (such as: MSC server) and the base station subsystem (specifically, RNC (Radio Network Controller) or base station (NodeB)) in the system. No longer - an example .

可以理解的是，本发明实施例中所使用的第一、第二等限定***、设备或单元的定语，并不表示一定顺序，只是为描述方便，用于区分不同的***、设备或单元，只要所述***、设备或单元能够实现本发明实施例的功能即可。 It can be understood that the first and second equivalent systems, devices or units used in the embodiments of the present invention do not indicate a certain order, but are convenient for description, and are used to distinguish different systems, devices or units. The system, device or unit can implement the functions of the embodiments of the present invention.

本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括： ROM、 RAM, 磁盘或光盘等。 A person skilled in the art may understand that all or part of the various steps of the foregoing embodiments may be completed by a program instructing related hardware. The program may be stored in a computer readable storage medium, and the storage medium may include: ROM, RAM, disk or CD, etc.

以上对本发明实施例所提供的建立本地交换的方法、核心网设备及基站子***进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。 The method for establishing a local exchange, the core network device, and the base station subsystem provided by the embodiments of the present invention are described in detail. The principles and implementation manners of the present invention are described in the specific examples. The description of the above embodiments is only The method for understanding the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific embodiment and the scope of application. The description should not be construed as limiting the invention.

Claims

权利要求书 Claim

1、一种建立本地交换的方法，其特征在于，包括： A method for establishing a local exchange, comprising:

根据所述要求切换的第一消息确定切换完成后构成会话的两个呼叫都位于第二基站子***、且满足本地交换的条件时，向所述第二基站子***发送请求切换的第二消息，指示所述第二基站子***为所述两个呼叫建立本地交换。 Determining, according to the requesting, the first message, that the two calls constituting the session after the handover is completed are located in the second base station subsystem and satisfying the condition of the local exchange, sending a second message requesting the handover to the second base station subsystem. Instructing the second base station subsystem to establish a local exchange for the two calls.

2、根据权利要求 1所述的建立本地交换的方法，其特征在于，进一步包括： 2. The method of establishing a local exchange according to claim 1, further comprising:

接收来自所述第二基站子***的指示切换完成的第三消息，当所述第三消息中包含为所述两个呼叫建立本地交换成功的信息时，清除为所述两个呼叫分配的核心网用户面资源； Receiving a third message from the second base station subsystem indicating that the handover is completed, and when the third message includes information for establishing a local exchange success for the two calls, clearing the core allocated for the two calls Network user area resources;

或者，接收来自所述第二基站子***的指示切换完成的第三消息，当所述第三消息中包含为所述两个呼叫建立本地交换失败的信息时，保留为所述两个呼叫分配的核心网用户面资源，并继续进行呼叫处理。 Or receiving a third message from the second base station subsystem indicating that the handover is completed, and when the third message includes information that the local exchange fails to be established for the two calls, the two call assignments are reserved. The core network user plane resources, and continue to handle the call.

3、根据权利要求 1或 2所述的建立本地交换的方法，其特征在于，进一步包括： The method for establishing a local exchange according to claim 1 or 2, further comprising:

接收来自所述第二基站子***的指示切换请求响应的第四消息，当所述第四消息中包含无法为所述两个呼叫建立本地交换的信息时，指示所述第一基站子***及所述第二基站子***释放所述两个呼叫；或者，接收来自所述第二基站子***的指示切换请求响应的第四消息，当所述第四消息中包含无法为所述两个呼叫建立本地交换的信息时，待切换完成后指示所述第二基站子***为所述两个呼叫建立本地交换。 Receiving a fourth message from the second base station subsystem indicating a handover request response, and when the fourth message includes information that cannot be locally exchanged for the two calls, indicating the first base station subsystem and The second base station subsystem releases the two calls; or receives a fourth message from the second base station subsystem indicating a handover request response, when the fourth message includes not being able to serve the two calls When the locally exchanged information is established, the second base station subsystem is instructed to establish a local exchange for the two calls after the handover is completed.

4、一种建立本地交换的方法，其特征在于，包括： 4. A method of establishing a local exchange, the method comprising:

接收来自基站子***的要求切换的第五消息，所述第五消息中包含为所述基站子***中的构成会话的两个呼叫申请建立本地交换的信息； Receiving a fifth message from the base station subsystem requesting handover, the fifth message including establishing a local exchange for two call requests constituting the session in the base station subsystem Information

5、根据权利要求 4所述的建立本地交换的方法，其特征在于，进一步包括： The method of establishing a local exchange according to claim 4, further comprising:

接收所述基站子***的指示切换完成的第七消息，当所述第七消息中包含为所述两个呼叫建立本地交换成功的信息时，清除为所述两个呼叫所分配的核心网用户面资源； Receiving a seventh message indicating that the handover is completed by the base station subsystem, and when the seventh message includes information for establishing a local exchange success for the two calls, clearing a core network user allocated for the two calls Surface resources;

或者，接收所述基站子***的指示切换完成的第七消息，当所述第七消息中包含为所述两个呼叫建立本地交换失败的信息时，保留为所述两个呼叫所分配的核心网用户面资源，并继续进行呼叫处理；或，接收到所述基站子***的指示切换完成的第七消息，当所述第七消息中包含为所述两个呼叫建立本地交换失败的信息时，待切换完成后指示所述基站子***为所述两个呼叫建立本地交换。 Or receiving a seventh message indicating that the handover is completed by the base station subsystem, and when the seventh message includes information that the local exchange fails to be established for the two calls, retaining the core allocated for the two calls Network user plane resources, and continue to perform call processing; or, receiving a seventh message indicating that the handover is completed by the base station subsystem, when the seventh message includes information for establishing local exchange failure for the two calls After the handover is completed, the base station subsystem is instructed to establish a local exchange for the two calls.

6、根据权利要求 4所述的建立本地交换的方法，其特征在于，进一步包括： The method of establishing a local exchange according to claim 4, further comprising:

如果不满足为所述两个呼叫建立本地交换的条件，向所述基站子 ***发送指示拒绝切换请求的第八消息，拒绝为所述两个呼叫建立本地交换。 If the condition for establishing a local exchange for the two calls is not met, an eighth message indicating rejection of the handover request is sent to the base station subsystem, refusing to establish a local exchange for the two calls.

7、根据权利要求 4至 6任一项所述的建立本地交换的方法，其特征在于，在所述接收来自基站子***的要求切换的第五消息之前进一步包括： The method of establishing a local exchange according to any one of claims 4 to 6, characterized in that, before the receiving the fifth message requesting handover from the base station subsystem, further comprising:

确定所述两个呼叫满足建立本地交换的条件时，向所述基站子系统发送询问是否切换的第九消息，所述第九消息包含指示所述基站子 ***为所述两个呼叫建立本地交换的信息。 Determining, when the two calls satisfy the condition for establishing a local exchange, sending a ninth message to the base station subsystem asking whether to switch, the ninth message including instructing the base station subsystem to establish a local exchange for the two calls Information.

8、一种建立本地交换的方法，其特征在于，包括： 8. A method of establishing a local exchange, the method comprising:

确定构成会话的两个呼叫位于同一基站子***且满足建立本地交换的条件时，向所述基站子***发送询问是否切换的第十消息，所述第十消息包括指示所述基站子***为所述两个呼叫建立本地交换的信息； Determining, when the two calls constituting the session are located in the same base station subsystem and satisfying the condition for establishing a local exchange, sending a tenth message asking whether to switch to the base station subsystem, The tenth message includes information indicating that the base station subsystem establishes local exchange for the two calls;

根据所述第十一消息，向所述基站子***发送指示执行切换操作的第十二消息，所述第十二消息包括指示所述基站子***为所述两个呼叫建立本地交换的信息。 And transmitting, according to the eleventh message, a twelfth message indicating execution of a handover operation to the base station subsystem, the twelfth message including information indicating that the base station subsystem establishes local exchange for the two calls.

9、一种核心网设备，其特征在于，包括： 9. A core network device, characterized by comprising:

第一发送单元，用于如果切换完成后所述两个呼叫都将位于所述第二基站子***且满足本地交换的条件，向所述第二基站子***发送请求切换的第二消息，所述第二消息包括指示所述第二基站子***为所述两个呼叫建立本地交换的信息。 a first sending unit, configured to send a second message requesting handover to the second base station subsystem if the two calls are located in the second base station subsystem after the handover is completed and meet the condition of local exchange The second message includes information indicating that the second base station subsystem establishes a local exchange for the two calls.

10、根据权利要求 9所述的核心网设备，其特征在于，还包括：第二接收单元，用于接收来自所述第二基站子***指示切换完成的第三消息，所述第三消息中包含指示本地交换是否建立成功的信息；和 The core network device according to claim 9, further comprising: a second receiving unit, configured to receive a third message from the second base station subsystem indicating that the handover is completed, in the third message Contains information indicating whether the local exchange was successfully established; and

第一资源管理单元，用于在所述第二接收单元接收到的第三消息包含指示本地交换建立成功的信息时，清除为所述两个呼叫分配的核心网用户面资源；或者在所述第二接收单元接收到的第三消息包含指示本地交换建立失败的信息时，保留为所述两个呼叫分配的核心网用户面资源。 a first resource management unit, configured to: when the third message received by the second receiving unit includes information indicating that the local exchange is successfully established, clear the core network user plane resource allocated for the two calls; or When the third message received by the second receiving unit includes information indicating that the local exchange establishment fails, the core network user plane resources allocated for the two calls are reserved.

11、根据权利要求 9或 10所述的核心网设备，其特征在于，所述第二接收单元还用于接收指示切换请求响应的第四消息，所述第四消息包含所述第二基站子***无法为所述两个呼叫建立本地交换的信所述第一发送单元还用于，在所述第二接收单元接收到的第四消息包含所述第二基站子***无法为所述两个呼叫建立本地交换的信息时，指示所述第一基站子***及所述第二基站子***释放所述两个呼叫；或者在所述第二接收单元接收到的第四消息包含所述第二基站子***无法为所述两个呼叫建立本地交换的信息时，待切换完成后指示所述第二基站子***建立本地交换。 The core network device according to claim 9 or 10, wherein the second receiving unit is further configured to receive a fourth message indicating a handover request response, where the fourth message includes the second base station The system cannot establish a locally exchanged message for the two calls. The first sending unit is further configured to: when the fourth message received by the second receiving unit includes information that the second base station subsystem cannot establish local exchange for the two calls, indicating the first The base station subsystem and the second base station subsystem release the two calls; or the fourth message received at the second receiving unit includes the second base station subsystem failing to establish a local exchange for the two calls The information indicates that the second base station subsystem establishes a local exchange after the handover is completed.

12、一种核心网设备，其特征在于，包括： 12. A core network device, comprising:

13、根据权利要求 12所述的核心网设备，其特征在于，还包括第二资源管理单元， The core network device according to claim 12, further comprising a second resource management unit,

所述第三接收单元还用于接收来自所述基站子***的指示切换完成的第七消息，所述第七消息包含所述基站子***为所述两个呼叫建立本地交换是否成功的信息； The third receiving unit is further configured to receive a seventh message from the base station subsystem indicating that the handover is complete, where the seventh message includes information that the base station subsystem establishes whether the local exchange is successful for the two calls;

所述第二资源管理单元用于在所述第七消息中包含所述基站子 ***为所述两个呼叫建立本地交换成功的信息时，清除为所述两个呼叫所分配的核心网用户面资源；在所述第七消息中包含所述基站子系统为所述两个呼叫建立本地交换失败的信息时，保留为所述两个呼叫所分配的核心网用户面资源。 The second resource management unit is configured to: when the seventh message includes the information that the base station subsystem establishes a local exchange success for the two calls, clear the core network user plane allocated for the two calls And storing, in the seventh message, the information about the core network user plane allocated to the two calls when the base station subsystem establishes information that the local exchange fails for the two calls.

14、根据权利要求 12所述的核心网设备，其特征在于，所述第二发送单元还用于在所述第二判断单元判断为所述两个呼叫建立本地交换的条件不满足时，向所述基站子***发送指示拒绝切换请求的第八消息，拒绝为所述两个呼叫建立本地交换。 The core network device according to claim 12, wherein the second sending unit is further configured to determine, in the second determining unit, that the two calls are locally established. When the condition of the exchange is not satisfied, an eighth message indicating that the handover request is rejected is sent to the base station subsystem, and the local exchange is refused for the two calls.

15、根据权利要求 12至 14任一项所述的核心网设备，其特征在于，还包括：第三判断单元，用于判断所述两个呼叫是否位于同一个基站子***且满足建立本地交换的条件； The core network device according to any one of claims 12 to 14, further comprising: a third determining unit, configured to determine whether the two calls are located in the same base station subsystem and satisfy local exchange establishment conditions of;

所述第二发送单元还用于在所述第三判断单元确定所述二个呼叫位于基站子***且满足建立本地交换的条件时，向所述基站子*** 发送询问是否切换的第九消息，所述第九消息包含指示所述基站子系统为所述两个呼叫建立本地交换的信息。 The second sending unit is further configured to: when the third determining unit determines that the two calls are located in the base station subsystem and meet the condition for establishing a local exchange, send a ninth message asking whether to switch to the base station subsystem, The ninth message includes information indicating that the base station subsystem establishes a local exchange for the two calls.

16、一种核心网设备，其特征在于，包括：第四判断单元、第三发送单元和第四接收单元，其中： A core network device, comprising: a fourth determining unit, a third sending unit, and a fourth receiving unit, wherein:

第三发送单元，用于在所述第四判断单元判断所述构成会话的两个呼叫均位于所述基站子***，且满足本地交换建立的条件时，向所述基站子***发送询问是否切换的第十消息，所述第十消息包含指示所述基站子***为所述两个呼叫建立本地交换的信息；根据第四接收单元接收到的第十一消息，发送指示执行切换操作的第十二消息，所述第十二消息包含指示所述基站子***为所述两个呼叫建立本地交换的信息； a third sending unit, configured to: when the fourth determining unit determines that the two calls constituting the session are all located in the base station subsystem, and satisfy a condition of local exchange establishment, send a query to the base station subsystem whether to switch a tenth message, the tenth message includes information indicating that the base station subsystem establishes local exchange for the two calls; and according to the eleventh message received by the fourth receiving unit, transmitting a tenth indicating that the switching operation is performed a second message, the twelfth message includes information indicating that the base station subsystem establishes local exchange for the two calls;

17、一种基站子***，其特征在于，包括： 17. A base station subsystem, comprising:

18、如权利要求 17所述的基站子***，其特征在于，还包括：第一发送单元，用于在所述第一本地交换建立单元为所述两个呼叫建立本地交换后，向所述核心网侧发送指示切换完成的第三消息，所述第三消息包含为所述两个呼叫建立本地交换是否成功的信息，使得所述核心网侧在本地交换建立成功时清除为所述两个呼叫分配的核心网用户面资源，或者在本地交换建立失败时保留为所述两个呼叫分配的核心网用户面资源。 The base station subsystem according to claim 17, further comprising: a first sending unit, configured to: after the first local exchange establishing unit establishes a local exchange for the two calls, The core network side sends a third message indicating that the handover is complete, and the third message includes information about whether the local exchange is successful for the two calls, so that the core network side clears to the two when the local exchange establishment is successful. The core network user plane resource of the call is allocated, or the core network user plane resource allocated for the two calls is reserved when the local exchange establishment fails.

19、一种基站子***，其特征在于，包括： 19. A base station subsystem, comprising:

20、如权利要求 19所述的基站子***，其特征在于，所述第二发送单元还用于在为所述两个呼叫建立本地交换成功时，向所述核心网侧发送指示切换完成的第七消息，所述第七消息包含为所述两个呼叫建立本地交换成功的指示信息。 The base station subsystem according to claim 19, wherein the second sending unit is further configured to: when the local exchange is successfully established for the two calls, send the indication that the handover is completed to the core network side. The seventh message, the seventh message includes indication information that the local exchange is successful for the two calls.

21、如权利要求 19或 20所述的基站子***，其特征在于，所述第二接收单元还用于接收来自所述核心网侧的询问是否切换的第九消息，所述第九消息包含指示所述基站子***为所述两个呼叫建立本地交换的指示信息； The base station subsystem according to claim 19 or 20, wherein the second receiving unit is further configured to receive a ninth message from the core network side to query whether to switch, the ninth message includes Instructing the base station subsystem to establish local exchange indication information for the two calls;

所述第二发送单元在所述第二接收单元接收到所述第九消息时，发送所述第五消息。 The second sending unit sends the fifth message when the second receiving unit receives the ninth message.