old p-tmsi在SGSN中保存时间？

理想

old p-tmsi在SGSN中保存多长时间呢？就是INTER路由区更新中，old SGSN会把MM上下文给new SGSN,里面包含old p-tmsi，这个old p-tmsi在NEW SGSN上，保存多长时间呢？协议里有什么规定没？或者设备上哪里可以配置呢？

理想

协议上关于新旧P-TMSI的定义
3GPP 24008
4.7.1.5 P-TMSI handling
4.7.1.5.1 P-TMSI handling in A/Gb mode
If a new P-TMSI is assigned by the network the MS and the network shall handle the old and the new P-TMSI as follows:
Upon receipt of a GMM message containing a new P-TMSI the MS shall consider the new P-TMSI and new RAI and also the old P-TMSI and old RAI as valid in order to react to paging requests and downlink transmission of LLC frames. For uplink transmission of LLC frames the new P-TMSI shall be used.
The MS shall consider the old P-TMSI and old RAI as invalid as soon as an LLC frame is received with the local TLLI derived from the new P-TMSI.
Upon the transmission of a GMM message containing a new P-TMSI the network shall consider the new P-TMSI and new RAI and also the old P-TMSI and old RAI as valid in order to be able to receive LLC frames from the MS.
The network shall consider the old P-TMSI and old RAI as invalid as soon as an LLC frame is received with the local TLLI derived from the new P-TMSI.
2G环境下，以收到LLC帧为判断依据，MS或网络侧收到一个带有本地TLLI的LLC帧时，则认为此P-TMSI为有效的，先前的则失效。
4.7.1.5.2 P-TMSI handling in Iu mode
If a new P-TMSI is assigned by the network the MS and the network shall handle the old and the new P-TMSI as follows:
Upon receipt of a GMM message containing a new P-TMSI the MS shall consider the new P-TMSI and new RAI as valid. Old P-TMSI and old RAI are regarded as invalid.
The network shall consider the old P-TMSI and old RAI as invalid as soon as an acknowledge message (e.g. ATTACH COMPLETE, ROUTING AREA UPDATE COMPLETE and P-TMSI REALLOCATION COMPLETE) is received.
3G环境下，只要收到ATTCH COMPLETE或RAU COMPLETE或者P-TMSI RELL COMPLETE消息，则认为新P-TMSI为有效，老的P-TMSI为无效。

理想

肯定不是直接删除的，2\3G环境下是不一样的，都有相应的判断依据。

理想

爱卫生 发表于 2012-10-16 22:40
谢谢“理想”朋友有理有据的补充和分享。学习了。谢谢！ 我尝试总结一下，按照上述“理想”引用的规范来回 ...

爱总，有没有遇到过PS域使用IMSI寻呼的信令?