由于安全模式超时导致PS域掉线的问题解决案例

摘要

在TD-SCDMA系统中，当RNC主动向CN发送Iu Release Request信令时网络就记为一次掉话或掉线（除去由于UE无反应导致的情况）。通过对现网Iu Release Request这条信令进行分析，发现其原因大多为安全模式超时，并总结了解决安全模式超时导致掉话问题的处理方法和经验。%In TD-SCDMA system, a dropping call happens when RNC sends Iu Release Request to UE except for the case of UE without response. Based on the analysis of Iu Release Request signaling, the reason behind dropping call is often security mode timeout. This paper summarizes the solution and experience to tackle dropping due to security mode timeout.