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[问题讨论] 手机怎么判断下行失步
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提问者:DR_KOG_POM
|
提问时间:2012-7-3 16:14
基站是根据SRS判断上行是否失步,那么手机是不是也需要判断下行失步呢?如果是的话,根据什么判断下行失步?
另外,手机是否能判断上行失步?
谢谢2楼的回复。个人认为ul grant不太可能。手机完全可以处于RRC连接状态、而没有上下行的业务数据发送。
关于TAC,个人感觉像是用于手机作上行同步监控的。
The UE has a configurable timer timeAlignmentTimer which is used to control how long the UE is considered uplink time aligned
并且当timer超时的时候,手机会通知RRC释放PUCCH/SRS
when timeAlignmentTimer expires:
- flush all HARQ buffers;
- notify RRC to release PUCCH/SRS;
- clear any configured downlink assignments and uplink grants.
只是个人看法,欢迎指教
关于TAC,个人感觉像是用于手机作上行同步监控的。
The UE has a configurable timer timeAlignmentTimer which is used to control how long the UE is considered uplink time aligned
并且当timer超时的时候,手机会通知RRC释放PUCCH/SRS
when timeAlignmentTimer expires:
- flush all HARQ buffers;
- notify RRC to release PUCCH/SRS;
- clear any configured downlink assignments and uplink grants.
只是个人看法,欢迎指教
回答时间:2012-7-4 09:20
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