top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What happens if eNB didnt receive rrc connection reconfiguration complete message from UE?

+2 votes
2,600 views
What happens if eNB didnt receive rrc connection reconfiguration complete message from UE?
posted Jan 29, 2015 by Gnanendra Reddy

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button
Ideally should resend (few times after the timer expiry) should be treated as failed after certain retry. Please check the specs for the timer name and recommended value.
commented Jan 29, 2015 by Salil Agrawal
will eNB send rrc connection reestablishment message?
commented Jan 29, 2015 by Gnanendra Reddy
Should be sent few times before declaring failure.
commented Jan 29, 2015 by Salil Agrawal

2 Answers

+1 vote

As per my understanding of specifications, UE runs a timer "T304" when it receives RRC connection reconfiguration (due to mobility). At expiry of timer, UE starts RRC Re-establishment procedure. But in other cases while establishing/modifying/releasing bearer(s) I am not sure that is there any re-transmission of rrc connection reconfiguration happens or not.

answer Jan 29, 2015 by Vikram Singh
+1 vote

there is internal timer at eNB side, Reconfiguration complete timeout.
In case of eNB not receiving response(Reconfiguration Complete) within the timer, It will detect Radio link fail for that UE and inform the same to upper layers to start another timer regarding releasing UE contexts.

Also T304 mentioned in above comment is monitored by UE not eNB, after completion of T304 timer, UE it self declares RLF and starts reestablishment procedure.

answer Apr 16, 2018 by Umang Doshi
Similar Questions
+2 votes
LTE: Why UE does not "attach complete" message along with "RRC Connection Reconfiguration Complete" ?

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 ?

...