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LTE: What eNodeB does after receiving S1 setup response ?

+1 vote
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In S1-Setup Request message, eNodeB tells max # (6) of broad casted PLMNs. In S1-Setup response message, MME responds back to eNodeB with maxnoofPLMNsPerMME(32) IE. I am not able to find the reason that why maxnoofPLMNsPerMME is 32 even eNodeB can broadcast maxium of 6 ?

posted Mar 16, 2014 by Vimal Kumar Mishra

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1 Answer

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As MME has one to many relationship with eNBs. Consider a scenario of RAN sharing where MME1 supports multiple(say 16) PLMN . (say PLMN1, PLMN2,....PLMN16).
There are two eNBs (say eNB1 and eNB2) where eNB1 supports few PLMN (say PLMN1-8) and eNB2 supports other few PLMN(say PLMN9-16). Hence in this scenario its justified.

Hope this make sense

answer Jun 12, 2014 by Sanjeet Kumar
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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.

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