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LTE: what is GU GROUP ID in lte, when it is used and what is the significance of it?

+1 vote
LTE: what is GU GROUP ID in lte, when it is used and what is the significance of it?
posted Mar 2, 2017 by anonymous

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1 Answer

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GU Group ID is the globally unique group id corresponding to a pool area.
GU Group ID = PLMN ID + MME Group ID

Mostly we can see this at X2 based procedures like given below.
1) X2 Setup Request
2) X2 Setup Response
3) eNB configuration update

Reference Spec:-36.423

answer Mar 2, 2017 by Sivakumar.d
The Group ID may be used in the X2 setup, but it is more specifically used as an identifier of the MME so the establishment of the S1 would be the correct link establishment.
It is used to identify which MME pool the MME is a part of, and this links to the UE's Globally unique ID (GUTI) which includes the group ID.
Now in English
Globally Unique Temporary Identifier (UE) = Mobile Contry Code (MCC) + the Mobile Network Code (MNC)  (MCC+MNC=PLMN ID) + MME Group ID + MME Code (MMEGI + MMEC = MMEI  and PLMN ID + MMEI = Globally Unique MME Identity (GUMMEI) + MME-Moble Temporary Identifier (M-TMSI).

I hope you enjoyed the alphabet soup.
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+4 votes

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