ithinc 发表于 2013-3-13 16:56
我是说新MME不能向旧SGW发Delete Session,不是说MME不能向SGW发送拉。我已经知道Huawei是怎么做的了,大家 ...
非常感谢!
终于搞清楚了。
新MME发向新SGW的create session是可以带BearerContexts to be removed的
TS 29.274
This IE shall be included on the S4/S11 interfaces for theTAU/RAU/Handover cases where any of the bearers existing before theTAU/RAU/Handover procedure will be deactivated as consequence of theTAU/RAU/Handover procedure. For each of thosebearers, an IE with the same type and instance value shall be included.
old MME发给old SGW的delete session终止在SGW(SGW change indicator in context-ack sent in s10 interface)。此步骤跟bearer context状态无关,只要SGW变了就会发。delete session per PDN。
新MME不能向old SGW发送delete session,尽管新MME知道old SGW的一切信息。因为如果发了delete session,后续old MME也要向old SGW发送delete session,这样就会导致old MME收到类似no exist一类的异常消息。
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