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What is TAU storm and how this problem can be resolved ?

+2 votes
What is TAU storm and how this problem can be resolved ?
posted Sep 12, 2015 by Harshita

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1 Answer

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When a huge no. of users move from one cell to another cell belonging to another TA and the respective tracking area has not been included in the assigned Tracking Area List to users. And all the users execute tracking area update procedure simultaneously.For example: when all the users are moving in a train.

There can be multiple solution for this problem but one solution which I would like to share with you is as following:
- Normally, network maintain tracking area list based on the cell , UE connects to the network.
- If network assign same tracking area list (TAL) to each user then there is a possibility for TAU storm.
- Network may put some intelligence based on the location of cell (near to railway station ), it may use to assign different TAL to each user to avoid TAU storm.

answer Sep 13, 2015 by Vimal Kumar Mishra
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+3 votes

It is well understood that Periodic TAU is used by MME to track UE location at the granularity of cell and tracking area.

Other than that, is there any reason of having periodic TAU procedure ?

+2 votes

If yes, then what are all possible scenarios in the network which causes to do so ?

+2 votes

Say e.g ENB given some random preamble to UE1 to do RACH, but in -case same preamble is selected by UE2(preamble given to UE 1) and doing RACH .
In the above scenario ENB will not give any CRM message to UE's so how contention will be resolved for UE2?

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