top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

How to inform MME about UE movement from eNB1 to eNB2 after UE sending Re-establishment-HO failure to eNB2 during HO?

+3 votes

How to inform MME about UE movement from Source eNB to Target eNB after UE sending Re-establishment with HO failure to target eNB during handover. In this case HO notify or path switch is applicable ?

posted Dec 23, 2014 by anonymous

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

2 Answers

+1 vote

In Case of X2 handover, target eNodeB sends PATH switch request to MME, while in case of S1-AP handover since MME is already aware about ongoing handover singalling, target eNodeB confirms handover by using "HO notify" message to MME.
Please correct me if I am wrong.

answer Dec 23, 2014 by Vimal Kumar Mishra
+1 vote

As far as I know,Handover failure occurs when UE is trying to do rach to the target cell but failed may be because of sync failure or exceeded preambleTransMax,In which case UE sends reestablishment to the target cell with HO-failure cause.
Path switch request(in case of X2-hanover) and Handover notify (in case of S1AP handover) will go to MME only when target ENB receives the reconfiguration complete message from UE and to send reconfiguration complete message UE will do contention free RACH.
So, Unless UE sends Reconfiguration complete to target cell there is no point to mention about the UE movement to the MME.

answer Mar 21, 2016 by Ashish Barapatre