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LTE: Why UE does not "attach complete" message along with "RRC Connection Reconfiguration Complete" ?

+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 ?

posted Jun 9, 2017 by Ganesh Kumar

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2 Answers

+1 vote

Before srb2 configuration, nas messages are transferred with srb1. Srb2 is configured after security activation during RRC connection reconfiguration. so attach complete message is send with srb2

answer Jun 10, 2017 by Veer Pal Singh Yadav
Thanks Veer to provide a logical reason. However I am not 100% sure SRB2 is an optional or mandatory signalling radio bearer. I posted another query lets see what response comes from professionals. I would also appreciate for your response.
0 votes

Hello, RRC connection establishment is done by dci (it carrier only scheduling information) in PDCCH. So the point is dci carries only scheduling information but does not carry data.

answer Jun 10, 2017 by Balagopal 24
Hi Balagopal thanks to share your inputs.
Lets try share our knowledge and improve our knowledge :)
Similar Questions
+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.

+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.

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