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Content for  TR 23.700-28  Word version:  18.1.0

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1 Scope  2 References  3 Definitions of terms and abbreviations  4 Architecture assumptions and Principles 
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1  Scope  p. 9

The scope of the TR is to investigate further 5GC/EPC enhancements to support satellite access using the work done in Release 17 as baseline with the following 5GC/EPC areas for study:
  • Possible enhancements to support of Discontinuous coverage with the following areas of focus:
    • Architectural enhancements to support discontinuous coverage for mobility enhancement (e.g. paging enhancement).
    • Architectural enhancements considering prediction, awareness and notification of UE wake-up time, power saving optimizations.
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2  References  p. 9

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 23.501: "System Architecture for the 5G System; Stage 2".
[3]
TS 23.502: "Procedures for the 5G system, Stage 2".
[4]
TS 23.503: "Policy and Charging Control Framework for the 5G System".
[5]
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
[6]
TS 23.682: "Architecture enhancements to facilitate communications with packet data networks and applications".
[7]
TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3".
[8]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[9]
TS 26.531: "Data Collection and Reporting; General Description and Architecture".
[10]
TS 23.288: "Architecture enhancements for 5G System (5GS) to support network data analytics services".
[11]
TR 23.700-61: "Study on Seamless UE context recovery".
[12]
TS 38.300: "NR; NR and NG-RAN Overall description; Stage-2".
[13]
TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode".
[14]
TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[15]
S2-2109199: "Support for IoT NTN with discontinuous coverage", Vodafone et al.
[16]
TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".
[17]
TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode".
[18]
TS 23.032: "Universal Geographical Area Description (GAD)".
[19]
TS 23.256: "Support of Uncrewed Aerial Systems (UAS) connectivity, identification and tracking; Stage 2".
[20]
TS 23.273: "5G System (5GS) Location Services (LCS); Stage 2".
[21]
TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".
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3  Definitions of terms and abbreviations  p. 10

3.1  Terms  p. 10

For the purposes of the present document, the terms given in TR 21.905, in TS 23.501 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 or in TS 23.501.

3.2  Abbreviations  p. 10

For the purposes of the present document, the abbreviations given in TR 21.905, in TS 23.501 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 or in TS 23.501.
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4  Architecture assumptions and Principles  p. 10

Discontinuous satellite coverage for satellite access in the context of this study is characterized by the fact that Uu interface is available for the UE less than 100% of the time, due to predictable patterns of satellite coverage.
The architecture for satellite access to 5GC as defined in TS 23.501 is used as a baseline.
The architecture for satellite access to EPC as defined in TS 23.401 is used as a baseline.
The solution defined for support of discontinuous coverage in EPC as defined in TS 23.401 could be used as a baseline.
Solutions should be applicable to both EPS and 5GS. Discontinuous satellite coverage under EPC and 5GC interworking is not considered.
Solutions shall minimize the impact on 5GS and EPS system protocols.
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