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TR 23.750SA2
Study for
Robust Call Setup
for VoLTE Subscriber in LTE

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for a better overview, the Table of Contents (ToC) is reproduced
V14.0.0 (Wzip)  2016/06  30 p.

Rapporteur:  Mr. Wu, Xiaobo

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.

full Table of Contents for  TR 23.750  Word version:   14.0.0

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1  ScopeWord-p. 6
2  ReferencesWord-p. 6
3  Definitions and abbreviationsWord-p. 7
4  Architectural AssumptionWord-p. 7
5  Key IssuesWord-p. 7
5.1  Key Issue 1 - How to improve VoLTE call setup success rate and minimize the negative impact on user experience for VoLTE subscriber in LTE with bad coverage overlaid with 2/3G CS coverageWord-p. 7
6  SolutionsWord-p. 8
6.1  Solution #1 to key issue 1: VoLTE→(e)CSFBUpWord-p. 8
6.1a  Solution #1a to key issue 1a: VoLTE→CSFBWord-p. 15
6.2  Solution #2 to key issue 1: SRVCC temporary rejectionWord-p. 17
6.3  Solution #3: Optimised CSFB ProcedureWord-p. 19
6.4  Solution #4: UE radio capabilities consideration during PLMN and RATWord-p. 20
6.5  Solution #5: Enabling provisioning of target cell(s) system informationWord-p. 21
6.6  Solution #6 to key issue 1: Retry in CS domainUpWord-p. 22
7  Overall EvaluationWord-p. 26
8  ConclusionsWord-p. 29
A  Change historyWord-p. 30

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