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what mme does once mme gets ULA(update location answer ) from HSS with respect to egtpc?

+2 votes

what mme does once mme gets ULA(update location answer ) from HSS with respect to egtpc?
what all scenario are available ?

posted May 1, 2017 by Rakesh Kumar Suman

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3 Answers

+1 vote

Update Location Procedure is used by MME to update the current location/serving network of UE/IMSI at HSS.
In order to do this, MME prepares and send Update Location Request message to HSS and HSS responds with subscription-details.
Based on the received subscription-detail from HSS, MME triggers EGTP-C message "Creates Session Request" message towards SGW.

answer May 4, 2017 by Vimal Kumar Mishra
0 votes

MME starts creation of default bearer based on subscriptions details got from HSS in update location answer

answer May 4, 2017 by anonymous
0 votes

I just want to add few more context here. After getting the update location answer message, MME retrieves the PGW IP address from the ULA message and initiates create session procedure towards that PGW. MME selects SGW based on the UE location (ECGI + TAI) to further proceed with initiated Create Session procedure.

answer Jul 6, 2018 by Harshita
Similar Questions
+1 vote

eg: if apn is abc.ap1, length of apn IE of create session request should be 7 or 8.?
If it is 8, what will be data type ?
I got little confused after reading specs (3gpp 29.274 clause 8.6 & 23.003 cl. 9.1, RFC 1035 3.3), the APN IE is encoded as one or more labels.

+2 votes

In what all scenarios, this procedure gets executed ? And why this procedure need to be executed ?

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