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Why attach request is embedded in RRC connection setup complete message ?

+1 vote
Why attach request is embedded in RRC connection setup complete message ?
posted Mar 12, 2015 by Gnanendra Reddy

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1 Answer

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1.LTE is a flat architecture and for signalling we are using MME and for data we are using eNodeb path. UMTS the RNC can handling both signalling and data for UE's because it is a hierarchical network. order to reduce the complexity,latency and better throughput the flat architecture has been deployed,so now come to the main point
" in RRC connection request msg we need to provide the basic identity (S-TMSI or random number) and establishment cause(MO-Signaling/Data.emergency etc) then only eNodeb can possible to give all lower layer configurations info(PDSCH,PUCCH,PUSCH,UL-Power,CQI,Schduling req),SRB,DRB info,
SPS Config info to the UE
4.Then only UE can does all proper configurations and then communicate with Core network nodes,other wise it is not possible for UE to do."
5.that's why Attach request is embedded in RRC connection setup complete.

answer Mar 12, 2015 by Sivakumar.d
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+2 votes

During attach procedure, UE sends "Attach Request" along with "RRC Connection Setup Complete", eNodeB sends "Attach Accept" along with "RRC Connection Reconfiguration then why UE does not send "Attach Complete" along with "RRC Connection Reconfiguration Complete" message ? What could be the reason for defining the messages so ?

+1 vote

Which message EnodeB will communicate to MME after Receiving the Reestablishment Complete message from UE. what else messages will transverse between EnodeB and MME, before sending Reconfiguration message to UE from EnodeB after Reestablishment complete message has been received at EnodeB.

+4 votes

There are couple of procedures are defined which consist of NAS as well as RRC signalling messages exchange.
Some of the NAS message sends to an UE through RRC Connection Reconfiguration message as piggybacked and some as DL Info transfer.

I want to know, Is there any procedure exists in lte when an UE receives RRC Connection Reconfiguration along with NAS message and responds back to network with NAS message first and then Reconfiguration Complete to eNodeB.

Usually, I saw UE sends RRC Connection Reconfiguration Complete message first then NAS response message.

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