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1、PPT主标题,MME丢弃X2切换过程中的CSFB寻呼,第十四行,MME下发paging消息,但是第十五行ENODEB回应用户正在进行X2切换,寻呼没有下发。根据3GPP规范如果MME收到X2切换引起的寻呼拒绝,MME需要在X2切换完成后重新下发。但是MME没有下发。,MME丢弃X2切换过程中的寻呼,If the MME receives a rejection to a NAS procedure (e.g. dedicated bearer establishment/modification/release; location reporting control; NAS message
2、transfer; etc.) from the eNodeB with an indication that an X2 handover is in progress (see TS36.3005), the MME shall reattempt the same NAS procedure either when the handover is complete or the handover is deemed to have failed, except in case of Serving GW relocation. The failure is known by expiry
3、 of the timer guarding the NAS procedure.,TAC-LAC-VLR对应关系配错,Cause #16 MSC temporarily not reachable This EMM cause is sent to the UE if it requests a combined EPS attach or tracking area updating in a PLMN where the MSC is temporarily not reachable via the EPS part of the network.,TAC-LAC-VLR对应关系配错,
4、查看TAI-LAI-VLR对应关系,查看VLR ID和VLR NAME对应关系,CSFB快速拨打(MO)第二次3G起呼,用户第一次CSFB通话完成后返回LTE,这时候发起TAU,在TAU complete之后,MME会发起RESUME notification(第25行)给SGW,通知SGW解挂以前挂起的承载。但是诺西的SGW目前版本不支持RESUME流程,没有回resume ack给MME,在MME等待SGW回复的过程中,MME收到了终端发来的ESR(第26行),但是因为之前流程未完成,MME未能正常响应,直到等待RESUME ACK超时,UE context release(第27和28行)。接下来终端到3G去起呼。 这个现象在短时间连续拨打(TAU complete之后3秒内),会出现。,CSFB快速拨打(MO)第二次3G起呼,