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

Question

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.

Answer 1

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.