路测专题分析_掉话课件.ppt

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1、路测分析专题（掉话篇）学习目标掌握路测过程出现的掉话分析学习完本课程，您将能够：第一章掉话分析呼叫流程原因及定位方法案例MSBSCChannelactivationackChannelactivationEncryptioncommandChannelrequiredCompleteLayer3Info.AuthenticationrequestCallproceedingCipherModeCompleteSABM(cm_serv_req)ImmediateassigncommandestablishindicationBTSCha

2、nnelrequestUA(cm_serv_req)CipherModeCommandImmediateassignmentMSCAuthenticationresponseSetupCipherModeCommandCipherModeComplete(Tobecontinued)1.1呼叫流程（主叫一）MSBSCBTSMSCAssignmentRequestChannelactivationackAssignmentcommandestablishindicationAssignmentCompleteAssignmentComp

3、leteDeactivateSACCHReleaserequestReleaseconfirmRFChannlereleaseRFChannelreleaseackAlertingConnectConnectacknowledgeSABMUAChannelactivation(Tobecontinued)1.1呼叫流程（主叫二）MSBSCBTSMSCChannelReleaseReleaseCompleteReleaseClearCommandRFChannlereleaseDISCDeactivateSACCHRFChannelre

4、leaseackReleaseIndicationUADisconnectClearComplete(End)1.1呼叫流程（主叫三）MSBSCBTSMSCChannelactivationackChannelactivationEncryptioncommandChannelrequiredCompleteLayer3Info.AuthenticationrequestCallconfirmCipherModeCompleteSABM(pag_resp)Immediateassigncommandestablishindicatio

5、nChannelrequestUA(pag_resp)CipherModeCommandImmediateassignmentAuthenticationresponseSetupCipherModeCommandCipherModeCompletePagingCommandPagingRequestPaging(Tobecontinued)1.1呼叫流程（被叫一）MSBSCBTSMSCAssignmentRequestChannelactivationackAssignmentcommandestablishindicationAs

6、signmentCompleteAssignmentCompleteDeactivateSACCHReleaserequestReleaseconfirmRFChannlereleaseRFChannelreleaseackAlertingConnectConnectacknowledgeSABMUAChannelactivation(End)1.1呼叫流程（被叫二）1.1呼叫流程（测试软件三层信息1）1.1呼叫流程（测试软件三层信息2）1.1呼叫流程（测试软件三层信息3）第一章掉话分析呼叫流程原因及定位方法案例1.2原因及定位方法覆

7、盖导致的掉话切换引起的掉话设置硬件或系统参数错误引起的掉话干扰而导致的掉话天馈线原因而导致的掉话传输故障造成的掉话采用直放站而导致的掉话1.2.1覆盖导致的掉话原因分析：（1）主越区覆盖后，由于缺少邻区或者产生干扰；（2）两小区的交界部分出现明显的无线信号覆盖的漏洞；（3）覆盖过小也可能是由于某个小区的硬件设备出现了问题，如天线受到阻挡或携载BCCH的载频发生了故障（功放部分）；（4）还有一种原因是由于一些高大建筑物所产生的阴影效应导致移动台信号发生快衰落而来不及切换引起的掉话；（5）邻小区定义不全会导致移动台保持通话在现有小区中，直

8、至超出该小区覆盖边缘而掉话。1.2.1覆盖导致的掉话解决措施：（1）查找覆盖不足的地区通过话务统计分析，首先确认该小区掉话率是否较高（同时也可能伴有较高的切出失败率），并且切换的原因多为救援性电平切换，而其它指标一切正