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What could be reason for LTE to 3G reselection failure?

+3 votes
1,163 views

I am seeing failure cause = 7 or 1

Which spec defines reselection failure causes?

posted Mar 18, 2015 by Alkesh Mehta

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What is the failure message i.e. is it TAU failure?
failure is in 3G and i can only see failure in event.
it does reselection successful to other 3G cell but this particular cell it does not reselect
I did not get the complete case, can you describe the message flow and at which stage its failing then can suggest the specs to look for :)
Case is: UE should perform LTE to 3G reselection (inter-RAT reselection).
Attach UE to LTE and then decrease power of LTE and UE should perform reselection to 3G

Failure is shown in EVENT-  IRAT reselection from EUTRAN start and cause displayed = 7

Thanks
This is resolved. It was environment issue
Hi Alkesh ,

Can you please explain here your findings for the actual reason that was causing this failure ?
Issue was poor RF and UE inactivity timer was very short
I think both of these causes are two different things means not-related , so you meant both cause were present simultaneously ? Because Ue inactivity in itself may cause failure of reselection due to idle state inactivity timer expiring even before trying for reselection?
yes they are not related.

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