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善于提问，勤于回答，你也是专家
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(普通问题)
提问者:
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• VoLTE网络优化工作 VOLTE启呼转CSFB 有哪些原因 2020-11-25
• VOLTE掉话机制是什么？ 2020-11-04
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• 终端无法稳定驻留LTE 2020-10-28
• LTE 如何控制UE动态选择信号比较好的频点来进行测量 2020-10-26
• 为什么VOLTE end之后，QCI=1的承载也正常释放了，但是不触发LTE2NR fast return 2020-10-22
• LTE UE在连接状态没有上报测量报告 2020-10-13
• VoLTE网络优化工作 VOLTE启呼转CSFB 有哪些原因 2020-11-25
• VOLTE掉话机制是什么？ 2020-11-04
• LTE attach何时会携带imsi 2020-10-30
• 终端无法稳定驻留LTE 2020-10-28
• LTE 如何控制UE动态选择信号比较好的频点来进行测量 2020-10-26
• 为什么VOLTE end之后，QCI=1的承载也正常释放了，但是不触发LTE2NR fast return 2020-10-22
• LTE UE在连接状态没有上报测量报告 2020-10-13
问题答案
( 3 )
在LTE中只有TAU(跟踪区)更新;UE进行位置更新是其回落到2/3G后,其LAC区与此前的TAC区不一致时才进行的....
回答者：
litom2004
回答时间：2014-06-06 18:03
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
10
8
单卡单待的手机当联合位置更新失败的情况下，手机10秒后会发起TAU更新，直至联合位置更新成功。
回答者：
windrain8888
回答时间：2014-06-13 10:28
9
6
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