可以参考这个帖子:
http://www.gprshome.com/forum.php?mod=viewthread&tid=528:
RAB Assignment失败导致的PDP激活失败的优化。如图:
根据规范,有些情况下,不一定会被拒绝。例如TS23.060里说:“
If the SGSN receives a RAB Assignment Response message with a cause indicating that the requested QoS profile(s) can not be provided (e.g. "Requested Maximum Bit Rate not Available"), then the SGSN may send a new RAB Assignment Request message with different QoS profile(s). The number of re-attempts, if any, as well as how the new QoS profile(s) values are determined is implementation dependent.”。但如果SGSN侧尝试了多次Qos的分配协商还失败,PDP最终应该还是被拒绝的。
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