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LTE: Why MME UE S1AP ID is of length 32 bits and eNodeB UE S1AP ID of length 24 bits only ?

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LTE: Why MME UE S1AP ID is of length 32 bits and eNodeB UE S1AP ID of length 24 bits only ?
posted Jul 17, 2018 by Harshita

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1 Answer

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MME serves multiple eNodeB's. MME should allow to attach the UE's from all the eNodeB's under this MME.

For example, if eNodeB1 and eNodeB2 were registered under MME. eNodeB1 assigns x number of eNodeB UE S1AP ID's for x successful attached UE's. Also, eNodeB2 assigns y number of eNodeB UE S1AP ID's for y successful attached UE's. But MME should assign (x+y) MME UE S1AP ID's.

answer Jul 18, 2018 by Althi Rajeswararao
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+1 vote

I found two MME UE S1-AP IDs i.e. MME UE S1AP ID (Mandatory) and MME UE S1AP ID 2 (optional).
I got why mandatory one is present but what's use of optional one.

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