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How does a SGW come to know whether CS Request message is received as part of Attach procedure or Handover Procedure ?

+3 votes

In case of SGW relocation, MME sends CSRequest to new SGW, now question how does a SGW come to know that CS Request is received as part of attach procedure or handover procedure ?

posted Sep 7, 2015 by Harshita

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1 Answer

+1 vote

In case of Handover SGW will receive a Modify Bearer Request. (SGW relocation). However if Handover happens between 3GPP and Non-3GPP Access type and SGW receives a CSRequest message then the Handover Indication Flag in Indication Flags IE will be set.

Peeyush Sharma

answer Sep 14, 2015 by Peeyush Sharma
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+2 votes

In case of S1-handover with the MME relocation, source MME sends an information "Target Identification" to target MME.
What the target MME does by receiving TAC, when an enodeb can be identified uniquely by using combination of (PLMN + Macro/Home ENodeB) ?

Can someone tell me what the purpose behind to send TAC as part of Target Id IE ?

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