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What will be the behaviour of EnodeB with MME after receiving RRC Connection Reestablishment Complete 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.

posted Aug 7, 2017 by Hamesh Raja M A

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1 Answer

+1 vote

I worked in RRC re-establishment procedure quite a long back. I remembered there was no message exchange between eNodeB and MME w.r.t RRC Re-establishment procedure. RRC Re-establishment is completely related to radio interface and MME does not bother about radio/RAN side.
In case radio connection breaks between UE and eNodeB and it does not resume within the time limit (for each scenario, eNodeB maintain different timer name and time duration), it informs MME regarding this and network take defined actions.
In new release of RRC specification, RRC Connection Re-establishment Complete may carry couple of extra information so that eNodeB can use that information and takes the corrective action to avoid RLF/Res-establishment going forward.

answer Aug 8, 2017 by Vikram Singh
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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 ?

+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

What is the significance of UE capability Information at MME ? What decisions are affected based on the UE capability information ?

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