[3GPP][NAS]The use of T3346

最新推荐文章于 2025-10-16 18:25:32 发布

原创最新推荐文章于 2025-10-16 18:25:32 发布 · 3.6k 阅读

5 ·

CC 4.0 BY-SA版权

文章标签：

#3GPP

技术专栏收录该内容

9 篇文章

订阅专栏

本文介绍了T3346定时器的作用及其在网络拥塞时如何进行NAS层的移动性管理阻塞控制。当网络发送带有原因值#22拥塞的拒绝消息时，UE将启动T3346定时器。文中还详细说明了定时器运行期间允许的NAS信令操作及停止条件。

T3346 timer value may be included in Attch Reject , Tracking Area Update (TAU) Reject or Service Request Reject sent by network to UE.

During EMM signaling congestion detected network will perform NAS level mobility management congestion control.

T3346定时器值将会被包含在网络端发给UE的attach reject、Tracking Area Update(TAU) reject 或者service request reject消息里。

主要是网络端用于NAS层的移动性管理的阻塞控制。

By sending reject message with cause value #22 Congestion If the reject message from network is not integrity protected UE starts T3346 with random value.

if it is integrity protected UE uses the value present in reject message.

Cases when NAS signalling allowed during T3346 running

Attach for emergency services can be initiated even if T3346 timer is running.
Attach can be trigger in a new PLMN which is not part of EQPLMN list and also not part of forbidden PLMN list.
TAU can be initiated in response to paging if UE in attempting to update state.
Deatch request can be initiated even T3346 is running

Reasons to stop T3346:

Upon reception of paging, UE shall stop T3346 and send service request or TAU request.

From：http://alliknowaboutwireless.blogspot.com/2016/07/t3346-nas-level-mobility-management.html