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How UE knows/decides it has to do combined attach in LTE? is it mandatory to have combined attach for CSFB?

+2 votes
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How UE knows/decides it has to do combined attach in LTE? is it mandatory to have combined attach for CSFB?
posted Mar 15 by Debasis Mohapatra

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2 Answers

+1 vote

combined attach procedure is also used by a UE in CS/PS to attach for EPS services if it is already IMSI attached for non-EPS services.
When the UE initiates a combined attach procedure, the UE shall indicate "combined EPS/IMSI attach" in the EPS attach type IE.
Combined attached is required in csfb case.UE, which wants to use CSFB, must first register itself to the CS domain via EPS through combined attach & detach procedure.

answer Mar 16 by Mohit Mohan
+1 vote

UE knows based on its operating Mode - LTE+WCDMA or LTE+WCDMA+GSM
if its multi-mode UE does combined attach procedure

answer Mar 17 by Alkesh Mehta
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