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LTE: What can be reason of handover preparation failure ?

+2 votes
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LTE: What can be reason of handover preparation failure ?
posted Apr 22, 2014 by Ganesh Kumar

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2 Answers

+1 vote

HO procedure could be interrupted also by TAU in the Source eNB

answer Apr 23, 2014 by Bart Barton
how TAU interrupt the HO?
Its a old thread, it may be better if you can ask a fresh query :) so that it reaches to more people.
0 votes

It is a very generic query. I am assuming here your query is related to intra Lte handover. Handover preparation failure can be happened at any of the following nodes:
1. Source MME
2. Target MME
3.Target SGW.
4. Target eNodeB

There can be a number of failure reasons like target eNodeB doesn't have radio resource any more to server a cater one more UE. Please refer 3GPP 36.413 section 9.2.1.3, which has list of the possible causes

answer Apr 22, 2014 by Vimal Kumar Mishra
All what Vimal said is true.

Adding one thing from top of my head.. The HO procedure could be interrupted also by TAU in the Source eNB
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+1 vote

Newly integrated 3rd carrier is facing IRAT handover failure with reason "unknown-targetID" and "Failure In Target EPC/eNB Or Target System". Other carriers of same enodeB are doing successful handover with the same WCDMA cell. Sometimes for the affected cell, handover is successful.

Thanks in advance,
Bijit

+1 vote

In case of hub-and-spoke topology, X2 messaging can travel all the way back to an aggregation point, which may be co-located with EPC. In such scenario both X2 and S1 traverses same physical path (a.k.a X2 over S1). Please consider both Intra-MME and Inter-MME handover scenarios. Would X2 based handover in such a case yield advantage over S1 based handover. Thanks.

+1 vote

Please can any one say when vertical key derivation can happen

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