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1、文档密级内部公开故障案例手机无响应导致下行TBF建立成功率低(内置PCU)故障现象某移动进行专项服务优化过程中,发现BSC6000内置PCU下面个别小区因业务量高导致(412福地市场1、412三江工业区3、412长南埔1)话统指标“手机无响应导致下行TBF建立失败次数”较高,导致下行TBF建立成功率较低,晚忙时特别明显。告警信息无异常告警原因分析首先,查看话统指标中的“手机无响应导致下行TBF建立失败次数”的统计点,MS无响应导致下行TBF建立失败包含以下两种情况:(1)MS无响应导致在CCCH上发起的下行TBF建立失败在下行TBF的建立流程中,
2、网络侧会发送POLLING消息给MS来获取TA值,并且预留块资源让MS回应指配确认消息。如果网络侧在指配的信道的预留块资源上未收到该MS的PACKETCONTROLACKNOWLEDGEMENT消息,网络侧会多次重发下行立即指配,直到超出最大尝试次数。图1是由于MS无响应导致建立下行TBF建立失败的过程。每当网络侧尝试次数超出最大值的时候,如图中的测量点A所示,统计值“手机无响应导致下行TBF建立失败次数”加一。图1MS无响应导致在CCCH上发起的下行TBF建立失败(2)MS无响应导致在PACCH上发起的下行TBF建立失败网络侧可以通过下面两种方
3、法来建立下行TBF:在当前的上行TBF传输过程中或下行TBF释放过程中发起新的下行TBF建立请求;在当前的下行TBF传输过程中为该TBF重新指配下行资源。 网络侧发送PACKETDOWNLINKhelpingbuildtheteam,setupanaccuratepovertyalleviationmechanisms,implementingtherequirementsofaccuratepovertyalleviation.Fouristheenterpriseattachesgreatimportancetopeople'slivelih
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7、perly"8.05"wangjiduVillageand"8.20"ancientvillagetorrentdebrisflowdisasters.Beforethedisaster,andtownshipPartyCommitteeteammembers,partymembersandcadresreservemilitia,armedpoliceofficersandmen,thecouragetodashthedangerzone,daredto2021-6-27华为机密,未经许可不得扩散第9页,共10页文档密级内部公开ASSIGNME
8、NT消息,并且预留块资源让MS回应指配确认消息。如果网络侧在指配的信道的预留块资源上未收到该MS的PACKETCONTROLACKNOW