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TR 23.750 (SA2)
Study for
Robust call setup for VoLTE subscriber in LTE

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(W-zip) V14.0.0    2016/06    30 p.


Rapporteur:  Mr. Wu, Xiaobo
See also:  VoLTE-related TS/TR    


The study is to investigate solutions to minimize call setup failure and improve user experience for VoLTE subscriber in LTE with bad coverage.

The study shall consider the scenarios where UE is both PS and CS registered or only PS registered and UE is already IMS registered initially.

The study will cover at a minimum the following scenarios:
  1. LTE with bad coverage is overlaid with 2/3G CS coverage.
  2. LTE with bad coverage is overlaid with WiFi access.
  3. LTE with bad coverage is overlaid with both 2/3G CS coverage and WiFi access.


 

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1   Scope   Word-p. 6
2   References
3   Definitions and abbreviations   Word-p. 7
4   Architectural Assumption
5   Key Issues
6   Solutions   Word-p. 8
6.1   Solution #1 to key issue 1: VoLTE->(e)CSFB      Up
6.1a   Solution #1a to key issue 1a: VoLTE->CSFB   Word-p. 15
6.2   Solution #2 to key issue 1: SRVCC temporary rejection
6.3   Solution #3: Optimised CSFB Procedure
6.4   Solution #4: UE radio capabilities consideration during PLMN and RAT
6.5   Solution #5: Enabling provisioning of target cell(s) system information
6.6   Solution #6 to key issue 1: Retry in CS domain      Up
7   Overall Evaluation
8   Conclusions   Word-p. 29
A   Change history   Word-p. 30

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