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How does paging procedure work for an UE for SMS service in a lte network ?

+3 votes
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How does paging procedure work for an UE for SMS service in a lte network ?
posted Feb 11, 2015 by Vikram Singh

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On behalf of Bart: There is paging over SGs interface with service indication that this is an amazing message. Than paging over s1mme.

You can find the procedure with detailed description here
http://www.lteandbeyond.com/2013/08/terminating-sms-over-sgs-interface.html

2 Answers

+2 votes

When an UE does combined i.e. EPS and non-EPS attache to network, it can receives SMS services from legacy CS network. VLR in CS network and MME in EPS may have SGs interface. VLR and MME both the nodes maintain SGs association states for each individual UE.

Followings are defined states of SGs association at VLR:
1. SGs-NULL
2. LA-UPDATE-REQUEST
3. SGs-ASSOCIATED

Followings are defined states of SGs association at MME:
1. SGs-NULL
2. LA-UPDATE-REQUESTED
3. SGs-ASSOCIATED

For those UEs which are configured to use CS fallback & SMS services over SGs interface or SMS services only, VLR can initiate SGsAP-PAGING-REQUEST towards MME.

answer Feb 12, 2015 by Harshita
+1 vote

To add to the above, SMSs are piggybacked in NAS messages

answer May 6, 2015 by Alkesh Mehta
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