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LTE中位置更新
在LTE中，什么情况下UE回进行位置更新，除了异系统切换，UE跨TAC，掉话，还有什么情况
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问题答案
13
13协议中如下规定的情况需要进行TAU：5.5.3 Tracking area updating procedure (S1 mode only)
5.5.3.1 General
The tracking area updating procedure is always initiated by the UE and is used for the following purposes:
- normal tracking area updating to update the registration of the actual tracking area of a UE in the network;
- combined tracking area updating to update the registration of the actual tracking area for a UE in CS/PS mode 1 or CS/PS mode 2 of operation;
- periodic tracking area updating to periodically notify the availability of the UE to the network;
- IMSI attach for non-EPS services when the UE is attached for EPS services. This procedure is used by a UE in CS/PS mode 1 or CS/PS mode 2 of operation;
- in various cases of inter-system change from Iu mode to S1 mode or from A/Gb mode to S1 mode (for details see subclauses 5.5.3.2.2 and subclause 5.5.3.3.2);
- S101 mode to S1 mode inter-system change;
- MME load balancing;
- to update certain UE specific parameters in the network (for details see subclauses 5.5.3.2.2 and subclause 5.5.3.3.2);
- recovery from certain error cases (for details see subclauses 5.5.3.2.2 and subclause 5.5.3.3.2);
- to indicate that the UE enters S1 mode after CS fallback or 1xCS fallback;
- to indicate to the network that the UE has selected a CSG cell whose CSG identity and associated PLMN identity are not included in the UE's Allowed CSG list or in the UE's Operator CSG list; and
- to indicate to the network that the UE's availability for voice calls in the IMS has changed to "available".
5.5.3.1 General
The tracking area updating procedure is always initiated by the UE and is used for the following purposes:
- normal tracking area updating to update the registration of the actual tracking area of a UE in the network;
- combined tracking area updating to update the registration of the actual tracking area for a UE in CS/PS mode 1 or CS/PS mode 2 of operation;
- periodic tracking area updating to periodically notify the availability of the UE to the network;
- IMSI attach for non-EPS services when the UE is attached for EPS services. This procedure is used by a UE in CS/PS mode 1 or CS/PS mode 2 of operation;
- in various cases of inter-system change from Iu mode to S1 mode or from A/Gb mode to S1 mode (for details see subclauses 5.5.3.2.2 and subclause 5.5.3.3.2);
- S101 mode to S1 mode inter-system change;
- MME load balancing;
- to update certain UE specific parameters in the network (for details see subclauses 5.5.3.2.2 and subclause 5.5.3.3.2);
- recovery from certain error cases (for details see subclauses 5.5.3.2.2 and subclause 5.5.3.3.2);
- to indicate that the UE enters S1 mode after CS fallback or 1xCS fallback;
- to indicate to the network that the UE has selected a CSG cell whose CSG identity and associated PLMN identity are not included in the UE's Allowed CSG list or in the UE's Operator CSG list; and
- to indicate to the network that the UE's availability for voice calls in the IMS has changed to "available".
回答者：wwwmscbsccom 回答时间：2014-06-07 11:46
