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What is the use of eNodeB direct transfer message and when it is used ?

+5 votes
What is the use of eNodeB direct transfer message and when it is used ?
posted Oct 7, 2014 by Neeraj Mishra

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1 Answer

+1 vote

UE sends Direct transfer message to eNB to deliver the NAS message to EPC Core - MME.

During the attach procedure:
1. MME sends (to eNB/UE) the NAS messages - Attach accept + Activate Default Bearer Request piggybacked with RRC Connection Reconfiguration message.
2. Now UE reply back with RRC Connection Reconfiguration Complete to eNB and UE also sends a DIRECT TRANSFER message to MME which contains Attach complete.

(Note: This direct transfer message is destined to MME and eNB simply forwards (direct transfer) this message to MME)

answer Oct 7, 2014 by Harsh Vardhan Shukla
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+2 votes

It may be an easy question but still I have some doubt.
How RRC Connection setup procedure gets impacted with the presence of "S-TMSI" as an UE-Identity within the RRC Connection Request message ?
Note: RRC Connection request message can carry either 5 bytes long (S-TMSI) or 5 bytes long random value.

+2 votes

I have basic handover related query. How source eNodeB get to know when it has to trigger handover required message ? I mean to ask, how a source eNodeB come to know the threshold values of RSRP or RSRQ or both (related to target eNodeB) , required to do a successful handover towards eNodeB ? Is it due to network planning ?

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