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

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

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1 Answer

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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
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+3 votes

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.
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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)?

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