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LTE X2 Handover: What is the necessity of presence of GUMMEI in handover request message ?

+7 votes
LTE X2 Handover: What is the necessity of presence of GUMMEI in handover request message ?
posted Feb 13, 2014 by Vimal Kumar Mishra

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1 Answer

+3 votes

If you see X2-AP handover request message. Then GUMMEI is a mandatory field. As part of X2 based handover procedure, target enodeb need to send Path switch request message to MME. To send this message to relevant MME, GUMMEI value is required since MME UE SIAP ID is not sufficient to send "Path Switch Request" message to correct MME.

I think I have answered your query. Feel free to ask any further query.

answer Feb 13, 2014 by Harshita
LTE: Why UE History Information IE has been kept as a mandatory field ?
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+5 votes

Please share your inputs/experiences on "handover restriction list" item ?

+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.

0 votes

Which of the following statements is FALSE regarding the S1-based handover?

A. The SGW may be relocated.
B. The MME may be relocated.
C. Direct data forwarding via the X2 interface may be used.
D. Indirect data forwarding via the SGW may be used.
E. None of the above statements are false.

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