CN101047570A - 媒体网关控制器确定用于承载的媒体网关的方法 - Google Patents

媒体网关控制器确定用于承载的媒体网关的方法 Download PDF

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CN101047570A
CN101047570A CNA2006100828402A CN200610082840A CN101047570A CN 101047570 A CN101047570 A CN 101047570A CN A2006100828402 A CNA2006100828402 A CN A2006100828402A CN 200610082840 A CN200610082840 A CN 200610082840A CN 101047570 A CN101047570 A CN 101047570A
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CN100466561C (zh
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李�杰
康明
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2007/070011 priority patent/WO2007137515A1/zh
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Abstract

本发明提供一种媒体网关控制器确定用于承载的媒体网关的方法，其关键在于，媒体网关控制器(MGC)根据设置的连接状态表来确定一个连接状态正常的媒体网关。先在MGC中设置一个用于记录MGW连接状态的连接状态表，MGW实时判断自身与可选承载路径上的直接连接的网络实体之间的连接状态是否发生了变化，如果是，则将连接状态变化情况上报给MGC；MGC再更新连接状态表。当MGC接收到呼叫建立请求消息时，就查询连接状态表，确定一个连接状态正常的MGW，并作为用于承载的MGW。应用本发明方案，MGC可以根据连接状态表准确地选择一个连接状态正常的MGW作为用于承载的MGW，从而可以避免呼叫损失。

Description

媒体网关控制器确定用于承载的媒体网关的方法
技术领域
本发明涉及建立承载的技术，特别是涉及媒体网关控制器确定用于承载的媒体网关的方法。
背景技术
目前，在引入软交换网络架构的移动网络中，电路域核心网被分离为承载面和控制面。其中，承载面由媒体网关(MGW)组成，控制面由媒体网关控制器(MGC)组成。MGC和MGW之间的接口为Mc接口，并且按照H.248协议进行交互。
在实际的移动通信网络中，一个或一个以上的MGW可以既与MGC相连，又同时与基站控制设备相连，组成的网络一般被称为MINI-IU-FLEX网络。
图1是一个典型的MINI-IU-FLEX网络结构示意图。如图1所示，MINI-IU-FLEX网络包括MGC、第一媒体网关(MGW-1)、第二媒体网关(MGW-2)、第三媒体网关(MGW-3)、无线接入侧设备、承载网、公共陆地移动网/公共交换电话网(PLMN/PSTN)。
其中，MGC与MGW-1和MGW-2相连，无线接入侧设备也与MGW-1和MGW-2相连，MGW-1、MGW-2、MGW-3则通过承载网相连。这里所述的无线接入侧设备可以是通用移动通信系统(UMTS)中的无线网络控制器(RNC)，也可以是全球移动通信系统(GSM)中的基站控制器(BSC)。
当无线接入侧设备下的用户终端与PLMN/PSTN中的某用户终端进行通话时，MGC需要先建立无线接入侧设备与PLMN/PSTN之间的承载路径，无线接入侧设备下的用户终端与PLMN/PSTN中的用户终端才能通过承载路径开始进行通话。这里所述的MGC可以是主叫方的MGC，即无线接入侧设备下的用户终端主动发起呼叫，也可以是被叫方的MGC，即由PLMN/PSTN中的某用户终端主动发起呼叫。
由于MGC和无线接入侧设备都与MGW-1和MGW-2相连，那么，MGC在建立承载路径的过程中，既可以选择MGW-1作为承载网络实体，也可以选择MGW-2作为承载网络实体。也就是说，承载路径可以由无线接入侧设备、MGW1、承载网、MGW3、PLMN/PSTN组成，也可以由无线接入侧设备、MGW2、承载网、MGW3、PLMN/PSTN组成，这两条承载路径都可以称为可选的承载路径。只有当MGC确定用于承载的MGW，完成承载路径的建立之后，某一条可选的承载路径才真正成为承载路径。在现有技术中，MGC一般是在MGW-1和MGW-2之间进行轮选，即轮流选择MGW-1和MGW-2作为用于承载的MGW，以达到分担承载负荷等目的。当然，实际应用中，如果有n个同时与MGC和无线接入侧设备相连的MGW，则MGC可以在这n个MGW中进行轮选。
MGW-1/MGW-2和可选的承载路径上直接相连的网络实体之间可以采用分组方式进行连接，如：同步传输模式(ATM)或IP方式。对于MGW-1/MGW-2所在的可选承载路径来说，所述可选的承载路径上直接相连的网络实体为无线接入侧设备或承载网中与MGW-1/MGW-2直接相连的某MGW等网络实体。
由于在现有技术中MGC一般采用轮选的方式来确定用于承载的MGW，那么，当MGW和可选承载路径上直接相连的网络实体之间的连接状态发生了变化时，仍然可能被MGC确定为用于承载的MGW，这可能会导致呼叫损失。比如：MGW-1和无线接入侧设备之间的连接发生了故障，无法正常接收到信号。但如果此时无线接入侧设备下的某用户终端发起呼叫，MGC接收到呼叫建立请求消息，则MGC需要确定用于承载本次呼叫的MGW。如果按照轮选的顺序应该由MGW-1承担本次承载任务，则MGC将确定出MGW-1为用于承载的MGW，然后控制MGW-1和无线接入侧设备之间建立承载。但实际上由于MGW-1和无线接入侧设备之间的连接已经发生了故障，不可能完成本次呼叫的任务，则必定导致本次呼叫的损失。
由此可见，在现有技术中，还没有一种MGC确定用于承载的MGW的方法，可以避免呼叫损失。
发明内容
有鉴于此，本发明的主要目的在于提供一种媒体网关控制器确定用于承载的媒体网关的方法，可以避免呼叫损失。
为了达到上述目的，本发明提出的技术方案为：
一种媒体网关控制器确定用于承载的媒体网关的方法，在媒体网关控制器MGC中设置用于记录媒体网关MGW连接状态的连接状态表，MGC根据MGW上报自身的连接状态变化情况实时更新连接状态表，该方法还包括：
MGC查询连接状态表，确定一个连接状态正常的MGW，并将确定的MGW作为用于承载的MGW。
较佳地，所述MGC根据MGW上报的连接状态变化情况实时更新连接状态表的方法为：
MGW按照物理层协议实时判断自身与可选承载路径上直接相连的网络实体之间的连接状态是否发生变化，如果是，则将携带有连接状态变化情况的连接状态改变请求消息发送给MGC，MGC按照连接状态变化情况更新MGW连接状态表。
较佳地，所述连接状态变化为：连接由正常状态转变为故障状态，或者由故障状态转变为正常状态。
较佳地，MGW与可选承载路径上直接相连的网络实体之间的连接为：同步传输模式ATM连接或IP方式连接。
较佳地，该方法进一步包括：在MGC中设置状态审计周期；
MGC在状态审计周期结束时向连接状态表中的所有MGW发送查询状态请求消息，所述的所有MGW向MGC返回当前自身与承载路径上直接相连的网络实体之间的连接状态情况。
较佳地，该方法进一步包括：在每一个MGW中设置连接状态上报周期；
每一个MGW在连接状态上报周期结束时向MGC上报当前自身与承载路径上直接相连的网络实体之间的连接状态情况。
综上所述，本发明提出的一种MGC确定用于承载的MGW的方法，由于可以由MGW向MGC上报自身与可选承载路径上直接相连的网络实体之间的连接状态变化情况，MGC可以在连接状态表中记录连接状态变化情况，并根据连接状态表确定一个连接状态正常的MGW，从而可以避免呼叫损失。
附图说明
图1是典型的MINI-IU-FLEX网络结构示意图；
图2是应用本发明方案的实施例的系统结构示意图；
图3是应用本发明方案的实施例流程图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图及具体实施例对本发明作进一步地详细描述。
本发明的基本思想是：MGC根据用于记录MGW连接状态的连接状态表确定一个连接状态正常的MGW，将所述连接状态正常的MGW作为用于承载的MGW。
本发明中，需要事先在MGC中设置一个用于记录MGW连接状态的连接状态表，将所有同时与MGC和无线接入侧设备相连的MGW记录在连接状态表中，并将连接状态初始值设置为正常。
本发明中，记录在连接状态表中的MGW将实时判断自身与可选承载路径上直接相连的网络实体的连接状态是否发生变化，如果发生变化，则向MGC上报携带有连接状态变化情况的连接状态改变请求消息，MGC再根据该消息实时更新自身的连接状态表。此后，MGC就可以根据连接状态表选择一个连接状态正常的MGW作为用于承载的MGW。
这里所述的连接状态变化包括两种情况：一种情况为连接状态由正常转变为故障，另一种情况为由故障转变为正常。
实际应用中，MGW与可选承载路径上直接相连的网络实体可以为分组连接方式，即ATM连接方式或IP方式，MGW上与可选承载路径上直接相连的网络实体之间的端口为ATM端口或IP端口。MGW可以根据物理层协议检测ATM端口或IP端口的信号是否正常，如果接收到的信号中断或失步，则判断为连接故障；否则，判断为连接正常。如果MGW的ATM端口或IP端口可以正常接收信号，就表示MGW与可选承载路径上直接相连的网络实体之间的连接状态是正常的，否则，就表示MGW与可选承载路径上直接相连的网络实体之间的连接状态发生了故障。也就是说，MGW可以根据物理层协议判断自身与可选承载路径上直接相连的网络实体之间的连接是否发生了变化。
为了更好地说明本发明方案，下面用一个较佳实施例来说明MGC确定用于承载的MGW的方法。
图2是本实施例系统结构示意图。如图2所示，本实施例中包括第一媒体网关、第二媒体网关和第三媒体网关，即MGW-1、MGW-2、MGW-3；MGC与MGW-1和MGW-2相连；无线接入侧设备为无线网络控制器(RNC)，并且RNC也与MGW-1和MGW-2相连；MGW-1、MGW-2、MGW-3通过承载网相连；MGW-1与RNC之间通过ATM方式连接，MGW-1中与RNC相连的端口为ATM端口；MGW-2与RNC之间通过ATM方式连接，MGW-2中与RNC相连的端口为ATM端口。
本实施例中，MGW-1的媒体网关号为111，MGW-2的媒体网关号222，RNC的信令点编码为555。MGW-1和MGW-2的媒体网关号，以及RNC的信令点编号都可以作为自身的网络实体标识。实际应用中，也可以用全局网络编码来标识RNC。
本实施例中，MGW-1与RNC之间的ATM连接发生中断，RNC下的某个用户终端再向PSTN中的某个用户终端发起呼叫。
图3显示了本实施例实现MGC确定用于承载的MGW方法的流程包括以下步骤：
步骤301：在MGC中设置MGW连接状态表，并将连接状态初始值设置为正常。
本实施例中，需要事先在MGC中设置一个用于记录MGW-1和MGW-2的连接状态的连接状态表，并将MGW-1和MGW-2的连接状态初始值设置为正常。本实施例中，连接状态表如表一所示：
  编号   MGW标识   RNC标识   连接状态
  1   111   555   正常
  2   222   555   正常
                      表一
本实施例中，并没有将承载网中与MGW-1或MGW-2直接相连的其它网络实体记录在连接状态表。而在实际应用中，可能还需要将可选承载路径上与MGW-1或MGW-2直接相连的其它网络实体记录在连接状态表中。比如：承载网中MGW-4位于可选承载路径上，并且与MGW-1直接相连，则应该将MGW-4也记录在连接状态表中。MGW-1也将实时判断自身与MGW-4之间的连接状态是否发生变化，如果是，则上报给MGC，由MGC更新连接状态表。当然，由于所述的RNC与所述的MGW-4都位于可选承载路径上，则需要MGW-1与RNC之间的连接状态、MGW-1与MGW-4之间的连接状态都同时处于正常状态时，MGC才能将MGW-1作为用于承载的MGW。
另外，实际应用中，如果有n个MGW同时与无线接入侧设备和MGC相连，则需要将这n个MGW都记录在连接状态表中。
步骤302：MGW-1判断出自身与RNC之间的连接发生故障，将携带有自身媒体网关号、RNC信令点编码和连接故障信息的连接状态改变请求消息发送给MGC。
实际应用中，MGW-1可以实时判断自身连接RNC的ATM端口是否正常，即是否可以正常地接收到电信号，如果是，则ATM端口正常，即连接正常；否则，ATM端口故障，即连接故障。
这里所述的连接故障信息就是一种连接状态变化的情况。实际应用中，可以用“1”表示连接故障，用“0”表示连接正常。当然，实际应用中，还可以用“1”表示连接状态发生变化，当MGC接收到连接状态改变请求消息后，就可以将连接状态表中该MGW对应的连接状态从“正常”改变为“故障”，或者从“故障”改变为“正常”。
当然，在实际应用中，当MGW-1与RNC之间的连接恢复正常，MGW-1就可以将携带有自身媒体网关号、RNC信令点编码和连接正常信息的连接状态改变请求消息发送给MGC。此时，所述的连接正常信息也是一种连接状态变化情况。
实际应用中，MGW向MGC上报的连接状态改变请求消息可以为扩展的Mc接口协议消息。
另外，实际应用中，MGW与可选承载路径上直接相连的网络实体之间的连接方式也可以采用IP连接方式，那么，MGW-1和MGW-2将根据自身的IP端口是否正常来判断连接状态是否正常，其方法与本实施例方法类似，此处不再赘述。
总之，只要MGW与可选的承载路径上直接相连的网络实体的连接状态发生了变化时，都会将连接状态变化情况上报给MGC。
步骤303：MGC根据MGW-1发送的连接状态改变请求消息更新MGW连接状态表。
本实时例中，MGC更新后的MGW连接状态表如表二所示：
  编号   MGW标识   RNC标识   连接状态
  1   111   555   故障
  2   222   555   正常
                     表二
步骤304：MGC查询MGW连接状态表，并确定连接状态正常的MGW-2作为用于承载的MGW。
本实施例中，步骤303之后，如果MGC接收到来自主叫方呼叫建立请求消息，MGC将会进行建立承载路径的任务，可以根据连接状态表确定连接正常的MGW-2作为一个用于承载的MGW。也就是说，在承载路径建立之后，RNC、MGW-2、MGW-3、PSTN将会组成承载本次呼叫的路径。至于如何建立承载路径属于现有技术，本实施例不再赘述。
在实际应用中，MGC接收来自主叫方呼叫建立请求消息和接收来自MGW的连接状态改变请求消息并没有先后顺利，两者之间是相互独立的，只要MGC接收到呼叫建立请求消息时查询连接状态表确定一个用于承载的MGW即可。
另外，实际应用中，为了保证连接状态表记录的连接状态与MGW-1和MGW-2的实际连接状态保持一致，可以在MGC中设置状态审计周期，并在每一个状态审计周期结束时向MGW-1和MGW-2发送查询状态请求消息，MGW-1和MGW-2分别向MGC返回当前各自与RNC之间的连接状态情况。
当然，实际应用中，还可以在MGW-1和MGW-2中设置连接状态上报周期，MGW-1和MGW-2在每一个连接状态上报周期结束时分别向MGC上报当前自身与RNC之间的连接状态情况。
综上所述，以上仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (6)

1、一种媒体网关控制器确定用于承载的媒体网关的方法，其特征在于，在媒体网关控制器MGC中设置用于记录媒体网关MGW连接状态的连接状态表，MGC根据MGW上报自身的连接状态变化情况实时更新连接状态表，该方法还包括：
MGC查询连接状态表，确定一个连接状态正常的MGW，并将确定的MGW作为用于承载的MGW。
2、根据权利要求1所述的方法，其特征在于，所述MGC根据MGW上报的连接状态变化情况实时更新连接状态表的方法为：
MGW按照物理层协议实时判断自身与可选承载路径上直接相连的网络实体之间的连接状态是否发生变化，如果是，则将携带有连接状态变化情况的连接状态改变请求消息发送给MGC，MGC按照连接状态变化情况更新MGW连接状态表。
3、根据权利要求2所述的方法，其特征在于，所述连接状态变化为：连接由正常状态转变为故障状态，或者由故障状态转变为正常状态。
4、根据权利要求2所述的方法，其特征在于，MGW与可选承载路径上直接相连的网络实体之间的连接为：同步传输模式ATM连接或IP方式连接。
5、根据权利要求1至4任一项所述的方法，其特征在于，该方法进一步包括：在MGC中设置状态审计周期；
MGC在状态审计周期结束时向连接状态表中的所有MGW发送查询状态请求消息，所述的所有MGW向MGC返回当前自身与承载路径上直接相连的网络实体之间的连接状态情况。
6、根据权利要求1至4所述的方法，其特征在于，该方法进一步包括：在每一个MGW中设置连接状态上报周期；
每一个MGW在连接状态上报周期结束时向MGC上报当前自身与承载路径上直接相连的网络实体之间的连接状态情况。
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CN103004260A (zh) * 2010-07-23 2013-03-27 瑞典爱立信有限公司 电信网络中的选通控制
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CN100359906C (zh) * 2003-11-17 2008-01-02 中兴通讯股份有限公司 同步h.248协议用户状态的方法
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CN103004260B (zh) * 2010-07-23 2016-11-16 瑞典爱立信有限公司 电信网络中的选通控制
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