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[转载] EPC网络中的EMM和ECM状态机 [复制链接]

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懒

发表于 2012-11-4 15:54:04 |显示全部楼层
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翻译自《LTE-Signaling&Protocol Analysis [E-UTRAN and UE》一书。该书原版也已上传至论坛城通网盘。

2.1.2.1 Relationship between EMM and ECM

In general, ECM relates to the presence of an S1-bearer plus RRC-connection. As long as both are present, the UE is in ECM-CONNECTED mode. Upon release, the UE switches to ECM-IDLE mode.

Therefore, the UE may well be EMM-registered but still be ECM-idle.

- While the UE is in ECM-CONNECTED state, the network is in charge to control the UE-mobility. While the UE is in ECM-CONNECTED mode, the location of the UE is known with the granularity of a cell inside an eNodeB.

- While the UE is in ECM-IDLE mode, the location of the UE is known with the granularity of a tracking area. Within ECM-IDLE mode, the UE shall perform autonomous cell reselection and tracking area update procedures.

2.1.2.1 EMM和ECM的关系

通常来说,ECM可以看成是存在一个S1的bearer加上一个RRC连接。只要上述两个都存在,UE就处于ECM-CONNECTED模式。一旦释放,UE将切换到ECM-IDLE模式。

因此,UE可能同时处于EMM-registered和ECM-idle状态。

- 当UE处于ECM-CONNECTED状态,网络侧来控制UE的移动性。当UE处于ECM-CONNECTED模式下,网络侧将知道UE位于的当前位置是处在哪个eNB的哪个小区下。

- 当UE处于ECM-IDLE模式,网络侧只知道UE处于哪个TA下。因此在ECM-IDLE模式下,UE应执行小区重选以及TAU流程。

参考:TS36.300(A.2)和,TS23.401(5.1.3.2.2.4)。

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发表于 2012-12-3 21:55:13 |显示全部楼层
呀 谢谢 站长啊!!! 最近在学EPC 这东西呢,好好看看先!!!

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Rank: 2Rank: 2

发表于 2013-5-20 10:06:28 |显示全部楼层
挺好~~谢谢分享

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Rank: 3Rank: 3Rank: 3

发表于 2014-2-17 16:36:03 |显示全部楼层

The location of a UE in ECM-IDLE state is known by thenetwork on a Tracking Area List granularity. A UE in ECM-IDLEstate is paged in all cells of the Tracking Areas in which it is currentlyregistered. The UE may be registered in multiple Tracking Areas. All thetracking areas in a Tracking Area List to which a UE is registered are servedby the same serving MME.这是401里的一句话。

“The UE may be registered in multiple Tracking Areas”。这句话不知道是什么意思哦。。。一个CELL只能属于一个TA,一个UE在一个时刻只能在一个CELL里,这里怎么说一个UE可以同时在多个TA里注册呢?



点评

爱卫生  还在没找答案。你说的有道理。研究中。。。  发表于 2014-2-17 19:45:15

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