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Content for  TR 23.750  Word version:  14.0.0

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1 Scope  2 References  3 Definitions and abbreviations  4 Architectural Assumption 
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1  Scope  p. 6

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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2  References  p. 6

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2".
[3]
TS 23.216: "Single Radio Voice Call Continuity (SRVCC); Stage 2".
[4]
TR 23.772: "Enhanced Circuit Switched (CS) Fallback".
→ to date, still a draft
[5]
TS 23.292: "IP Multimedia Subsystem (IMS) centralized services; Stage 2".
[6]
TS 23.003: "Numbering, addressing and identification".
[7]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
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3  Definitions and abbreviations  p. 7

3.1  Definitions  p. 7

For the purposes of the present document, the terms and definitions given in TR 21.905 apply.

3.2  Abbreviations  p. 7

For the purposes of the present document, the abbreviations given in TR 21.905 apply.

4  Architectural Assumption  p. 7

The existing 3GPP Architecture shall be reused in the development of alternative solutions.

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