top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

How S-MME knows about T-SGSN id when it receives HO required message from S-eNB?

+1 vote
385 views
How S-MME knows about T-SGSN id when it receives HO required message from S-eNB?
posted Sep 2, 2015 by Gnanendra Reddy

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

1 Answer

0 votes

In S1-AP Handover Required message, target Id IE carries LAI, RAC in case of handover towards UMTS. After receiving the handover message, MME does DNS query based on the received LAI, RAC parameters to get the SGSN-ID.

Reference:
http://www.etsi.org/deliver/etsi_ts/129300_129399/129303/08.00.00_60/ts_129303v080000p.pdf

answer Sep 2, 2015 by Vimal Kumar Mishra
Similar Questions
+3 votes
When S1 HO is initiated by source eNB admin down, what should be the value of ac-BarringFactor in HO Required message?

Suppose I have two eNBs, configured as S1 intra-frequency neighbours and my UE is attached to one of them. There is no X2 connection present between them.
Now, I have done admin down to the source eNB. So, HO process is triggered. As a consequence of this, source eNB sends HO required message to MME.

My query is, in this HO required message, what should be the value of ac-BarringFactor??
Should it be P00 or the last value set before admin down(e.g., P95)?

+2 votes
LTE: How source eNodeB get to know when it has to trigger handover required message towards MME ?

I have basic handover related query. How source eNodeB get to know when it has to trigger handover required message ? I mean to ask, how a source eNodeB come to know the threshold values of RSRP or RSRQ or both (related to target eNodeB) , required to do a successful handover towards eNodeB ? Is it due to network planning ?

+3 votes
How to inform MME about UE movement from eNB1 to eNB2 after UE sending Re-establishment-HO failure to eNB2 during HO?

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 ?

0 votes
X2 HO preparation success rate suddenly decreased with root cause as invalid MME Group ID and MME Group ID is unique?

X2 HO preparation success rate suddenly decreased in some sites. the root cause is invalid MME Group ID, however MME Group ID is unique. Could you please comment about issue ?

...