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In Which scenario ENB sends DETACH request with EPS service not allowed?

+1 vote
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In Which scenario ENB sends DETACH request with EPS service not allowed?
posted Jul 11, 2018 by Jaganathan

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Detach Request is a NAS message and it originates from either UE or network side.
eNodeB does not deal with any NAS message since it can't be decoded and encoded at eNodeB.

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+1 vote

Generally MME serves a group of tracking areas and belongs to at least one PLMN.
Lets assume, MME receives S1-setup request from eNodeB with the list of supported TAs.
Now, there are three possibilities as captured below.
1. All supported TAIs match at MME
2. Not even a single TAI match at MME
3. Few TAIs match at MME

I want to know, what MME will do for case 2 and case 3 ? How it will respond to eNodeB ?
If MME responds with S1-setup failure then what would be the cause value ? I did not find any reference in 36.413 for these scenarios.

+2 votes

Can somebody please explain the procedure of Detach Request if it is triggered by Network.?

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