MG003305A接口信令分析与处理ISSUE11

课程说明MG003305A接口信令分析与处理ISSUE1.1华为技术有限公司MG003305A接口信令分析与处理ISSUE1.1目录i目录课程说明.......................................................................................................................................1课程介绍.......................................................................................................................................1课程目标.......................................................................................................................................1相关资料.......................................................................................................................................1第1章A接口消息分析.................................................................................................................21.1A接口消息简介......................................................................................................................21.2A接口消息分析......................................................................................................................41.2.1位置更新消息...............................................................................................................41.2.2CM业务请求消息(CMServiceRequest)：...............................................................71.2.3连接确认消息(ConnectConfirm)：............................................................................81.2.4正常有连接消息...........................................................................................................91.2.5无连接消息...............................................................................................................161.3A接口信令流程分析............................................................................................................221.3.1位置更新流程............................................................................................................221.3.2MS呼叫MS(同在一个BSC内)A接口消息流程分析...............................................24第2章故障案例分析..................................................................................................................312.1告警故障案例......................................................................................................................312.2两厂家设备A接口配合存在问题案例..................................................................................33小结.............................................................................................................................................36学习指导.....................................................................................................................................37MG003305A接口信令分析与处理ISSUE1.1课程说明1课程说明课程介绍本教材对应的产品为：MSC60大容量移动交换机。主要讲述了A接口的消息分析方法以及典型的案例。学习之后，大家能够掌握A接口消息分析的方法和思路。课程目标完成本课程学习，学员能够掌握：A接口信令分析方法A接口故障处理的思路相关资料MG003305A接口信令分析与处理ISSUE1.1第1章A接口消息分析2第1章A接口消息分析1.1A接口消息简介在学习了A接口流程和协议之后，这一节中我们主要对A接口消息进行分析。首先让我们先来看一下A接口的主要消息：1、建立连接消息：位置更新消息(LocationupdatingRequest)CM业务请求消息(CMServiceRequest)连接确认消息(ConnectConfirm)2、正常有连接消息：鉴权请求消息(AUTHENTICATIONREQUEST)鉴权响应消息(AUTHENTICATIONRESPONSE)加密命令消息(CIPHERMODECOMMAND)加密结束消息(CIPHERMODECOMPLETE)位置更新接收消息(LOCATIONUPDATINGACCEPT)CM业务接收消息(CMSERVICEACCEPT)SETUP消息(SETUP)呼叫进行消息(CALLPROCEEDING)指配请求消息(ASSIGNMENTREQUEST)指配结束消息(ASSIGNMENTCOMPLETE)振铃消息(ALERTING)通话建立消息(CONNECT)连接确认消息(CONNECTACKNOWLEDGE)MG003305A接口信令分析与处理ISSUE1.1第1章A接口消息分析3挂机消息(DISCONNECT)释放消息(RELEASE)释放结束消息(RELEASECOMPLETE)清除命令(CLEARCOMMANG)清除结束(CLEARCOMPLETE)3、无连接消息：复位电路(RESETCIRCUIT)阻塞电路(BLOCKCIRCUIT)解闭电路(UNBLOCKCIRCUIT)复位消息(RESET)未安装电路(unequippedcircuit)MG003305A接口信令分析与处理ISSUE1.1第1章A接口消息分析41.2A接口消息分析1.2.1位置更新消息下面先让我们对一个A接口上跟踪到的位置更新消息进行详细的分析：FB0B3BC3B24030E0010100410202060443B200FE040443C100FE0F21001F5705080064F02025000001171205082064F00025000108490620729000006000首先，我们先对MTP与SCCP消息进行分析：(注：X”为待分析的BIT，“?”为此时暂不分析的BIT)：标准消息格式对应消息内容对应字节?XXXXXXXBSN?1111010后向序号0xFBX???????BIB1???????后向指示位?XXXXXXXFSN0???????前向序号0x0BX???????FIB?0001011前向指示位??XXXXXXLI??111011信号单元长度指示码0x3BXX??????00??????无效段????XXXXSI????0011业务指示语0xC3??XX??????00????无效段??XXXXXXNI11??????网络指示语XXXXXXXX??XXXXXXDPC10100010??000000目的信令点00B20xB20x400x300xE0XX??????XXXXXXXX????XXXXOPC01??????00110000????0000源信令点00C1XXXX????SLS1110????信令链路选择码0EXXXXXXXX消息类型00000001CR消息0x013个字节SourceLocalReference010041h源端本地编码0x010x000x41????XXXX协议类别????00102类业务0x02XXXX????0000????无效段1个字节长度可变必备指针00000010被叫地址指针0x021个字节任选部分开始指针00000110指向主叫地址0x061个字节长度指示语04h被叫地址长度0x04MG003305A接口信令分析与处理ISSUE1.1第1章A接口消息分析5标准消息格式对应消息内容对应字节???????X信令点表示语???????1包括信令点码0x43??????X?子系统表示语??????1?包括子系统号??XXXX??全局码表示语??0000??不包括全局码?X??????路由表示语?1??????DPC和SSN选路X???????0???????国内备用2个字节信令点编码00B2h源信令点编码0xB2001个字节子系统号0xfeA接口子系统0xFE1个字节任选参数名0x04主叫地址名0x045个字节任选参数内容0443C100FEh格式同被叫地址0443C100FEh1个字节任选参数名0x0FSCCP用户数据0x0F1个字节任选参数长度0x21SCCP用户数据长度(后面即为BSSAP消息)0x21然后，让我们再来看BSSMAP消息的分解：0x00：BSSMAPindicator0x1f：BSSMAPmessagelength=310x57：CompleteL3information0x05：CellIDIEI0x08：CellIDlength0x00：CellIDdiscriminator0x640xf0：MCCdig.0x20：MNCdig.0x250x00：LAC0x000x01：CI0x17：L3informationIEI0x12：L3informationlength=18MG003305A接口信令分析与处理ISSUE1.1第1章A接口消息分析60x05：SI=0(4bit)，PD=B_0101(Mobi