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LTE: Is there any option by which UE registers to LTE network for data and voice through 3G/legacy network?

+4 votes
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Is there any option is the LTE handset by which when UE makes a voice call it goes through legacy network 2G/3G and for data it uses LTE network assuming LTE network supports LTE data/VoLTE/Legacy Network ?

posted Jun 10, 2017 by Harshita

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1 Answer

+1 vote

I am not sure but I think while doing combined attach, UE sends an IE "Voice domain preference and UE's usage setting". This IE is used to inform MME whether UE first preference is either IMS based or CS fallback. Based on this IE, MME takes further action.

However I could not understand the importance of "UE' usage setting". It has two possible values. '0' is used for "voice centric" and '1' is used for "data centric". What is the significance of this IE for the MME?

answer Jun 11, 2017 by Neeraj Mishra
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