跟踪小区Uu口信令发现，Activate PDP Context Reject主要原因均为：protocol configuration options，而对应Rab Assignment Response-Failure原因为：TimeOut。经查, protocol configuration options对应解释为：

The PDP primary context activation failed, the PDP context is not activated. One reason for failure is that the network rejected the activation attempt, which means the ACTIVATE PDP CONTEXT REJECT message was received. Another reason is e.g. that it was not possible to establish the needed LLC link in the GSM case.

从协议可以发现，原因有两个方面，一个是网络拒绝，另一个是无法建立LLC链路。

问题来了，有多少人遇见过此类问题，最终解决方案是核心网侧还是RNC侧，是通过什么手段解决的？