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UMTS Handover procedures

UMTS Handover procedures

(OP)
Hi guys,

I was wondering if you could help me with a couple of UMTS Handover questions below that I can't seem to get the answers to. I have been trawling 3GPP RANAP/GMM/GSM specs but to no avail unfortunately.


My questions are regarding Control Plane messages seen on the IuPS interface.


1.Is there any message or IE on the IuPS interface which can be used to identify whether a Routing Area Update (RAU) is Intra-SGSN or Inter-SGSN based? Based on information in RAU Request message or  any other message which could be used to make this distinction?


2. Is there any message or IE on the IuPS interface that can be used to identify whether  an SRNS relocation is Intra-SGSN or Inter-SGSN based? Based on information in Relocation required message or any other message which could be used to make this distinction?


3. Is there any message or IE on the IuPS interface that can be used to identify whether  an Inter-RAT handover is UMTS->GSM CS or UMTS->GSM PS based? Based on perhaps  Source/Target ID IE in Relocation required message or any other message which could be used to make this distinction?

Thanks in advance,
Alan

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