top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

How TAU in source eNB interrupts S1 handover (intra MME S1 HO)?

+3 votes
1,157 views
How TAU in source eNB interrupts S1 handover (intra MME S1 HO)?
posted Feb 18, 2015 by Alkesh Mehta

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

+1 vote

I think your query is related to periodic TAU, once the periodic TAU timer expires, UE initiates TAU.
As per my understanding, there is no interrupt since TAU is a NAS procedure and handover is S1-AP. Even though handover procedure is in progress, there is no impact on periodic TAU procedure.

Please correct me if I am wrong or misunderstood your query.

answer Feb 18, 2015 by Vimal Kumar Mishra
thanks. observed from successful HO that TAU does not affect s1 handover
Similar Questions
+3 votes

What MME shall perform when receiving S1 path switch request (changing tac and lac for the UE) after a NAS tau request. Shall MME respond to UE with TAU reject (which cause code ) or not ?

+1 vote

I found two MME UE S1-AP IDs i.e. MME UE S1AP ID (Mandatory) and MME UE S1AP ID 2 (optional).
I got why mandatory one is present but what's use of optional one.

Can someone please explain it ?

0 votes

When target eNodeB is not able to allocate resource for all the bearers which comes as part of Handover Request message, it sends handover request ack with partial success since "E-RABs Failed to Setup List" is present in HOReqAck message.
What MME or source eNodeB does in that case ? Does any action taken by MME for the E-RABs which failed to setup at target eNodeB or some other actions taken ?

+2 votes

Is it possible, source eNodeB has received "handover command" message from MME and now it want to cancel handover procedure ?
What could be the possible reasons when source eNodeB want to cancel ongoing handover procedure ?

+5 votes

As part of S1-AP procedure with MME relocation, Handover Required message sent to source MME. Target eNodeBId is present within the handover required. How source MME figure out target cell is being served by XYZ MME and sends "Forward relocation Request" message to XYZ MME.

Please provide reference also if it is there ?

...