从附着和PDP激活流程看Local和Foreigh TLLI的变化

czx10224

爱卫生 发表于 2012-4-26 20:06
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这个问题已经有明确的答案。什么生效取决于SGSN给MS发的GMM消息中，BSSGP包头里有 ...

A change of TLLI may occur as a consequence of a P-TMSI reallocation. The new TLLI shall be used to address the mobile station after completion on the network side of the related GMM procedure (see 3GPP TS 24.008). However, the SGSN should not use the new TLLI for BSSGP addressing purposes towards the BSS either:

- until having signalled the change of TLLI to the BSS via the Downlink UNITDATA procedure (see sub-clause 6.1) or

- until having received from the BSS any BSSGP PDU including the new TLLI.

有两种情况可以表示New TLLI开始生效，或者是SGSN在下行消息中携带了Current TLLI和Old TLLI，通知MS在下次上行消息中，应该使用New TLLI，或者是MS在下一次上行消息中携带New TLLI，标识New TLLI开始生效。抓包中的GMM消息即携带了Current TLLI,Old TLLI的消息是可以省略的，本来这个消息MS就不一定支持。一方之言