Content for TR 23.700-33 Word version: 18.0.0
1 Scope
2 References
3 Definitions of terms and abbreviations
4 Architecture Requirements and Assumptions
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1 Scope p. 11
The scope of this Technical Report is to study and evaluate the possible architecture enhancements to the 5G Proximity-based Services (5G ProSe) system defined in TS 23.304, based on the relevant Stage 1 requirements defined in TS 22.261, TS 22.278 and TS 22.115 and determine which of the solutions can proceed to normative specifications.
This study will consider architecture enhancements in the following areas:
- Support of single NR PC5 hop UE-to-UE Relay for unicast.
- Enhancement of 5G ProSe UE-to-Network Relay functionality.
- Support of path switching between direct NR Uu communication path and direct NR PC5 communication path (i.e. non-relay case).
2 References p. 11
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]
TR 23.752: "Study on system enhancement for Proximity based Services (ProSe) in the 5G System (5GS)".
[3]
TS 23.304: "Proximity based Services (ProSe) in the 5G System (5GS)".
[4]
TS 22.261: "Service requirements for next generation new services and markets; Stage 1".
[5]
TS 22.278: "Service requirements for the Evolved Packet System (EPS); Stage 1".
[6]
TS 22.115: "Service aspects; Charging and billing; Stage 1".
[7]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[8]
TS 23.502: "Procedures for the 5G System (5GS); Stage 2".
[9]
TS 22.101: "Service aspects; Service principles".
[10]
TS 32.277: "Proximity-based Services (ProSe) charging".
[11]
TS 23.713: "Study on extended architecture support for proximity-based services".
[12]
IETF RCF 4862: "IPv6 Stateless Address Autoconfiguration".
[13]
TS 23.503: "Policy and Charging Control Framework for the 5G System".
[14]
TS 38.331: "NR; Radio Resource Control (RRC); Protocol Specification".
[15]
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
[16]
TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 2".
[17]
TS 23.280: "Common functional architecture to support mission critical services; Stage 2".
[18]
TS 38.423: "NG-RAN; Xn Application Protocol (XnAP)".
[19]
TS 38.413: "NG-RAN; NG Application Protocol (NGAP)".
[20]
TR 38.836: "Study on NR sidelink relay".
[21]
TS 24.554: "Proximity-services (ProSe) in 5G System (5GS) protocol aspects; Stage 3".
[22]
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[23]
TS 23.167: "3rd Generation Partnership Project; Technical Specification Group Services and Systems Aspects; IP Multimedia Subsystem (IMS) emergency sessions".
[24]
TS 33.503: "Security Aspects of Proximity based Services (ProSe) in the 5G System (5GS)".
[25]
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
[26]
TS 24.379: "Mission Critical Push To Talk (MCPTT) call control; Protocol specification".
[27]
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".
3 Definitions of terms and abbreviations p. 12
3.1 Terms p. 12
For the purposes of the present document, the terms given in TR 21.905 and TS 23.304 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 and TS 23.304.
5G ProSe End UE:
A 5G ProSe-enabled UE that connects with another 5G ProSe-enabled UE(s) via a 5G ProSe UE-to-UE Relay.
5G ProSe UE-to-UE Relay:
A 5G ProSe-enabled UE that provides functionality to support connectivity between 5G ProSe End UEs.
3.2 Abbreviations p. 12
4 Architecture Requirements and Assumptions p. 12
4.1 Architecture Requirements p. 12
Solutions shall build on the 5G ProSe architecture principles as defined in TS 23.304 and 5G System architectural principles as defined in TS 23.501, including flexibility and modularity for newly introduced functionalities.
In order to satisfy the normative stage-1 general requirements in TS 22.278, TS 22.261 and TS 22.115, the system shall:
- support single NR PC5 hop UE-to-UE Relay for unicast.
-
enhance UE-to-Network Relay functionality to support:
- service continuity when switching between two indirect network communication paths for UE-to-Network Relay;
- service continuity when switching between direct network communication path and indirect network communication path for 5G ProSe Layer-2 UE-to-Network Relay, including inter-gNB indirect-to-direct and inter-gNB direct-to-indirect path switching;
- multi-path transmission using only one direct network communication path and only one indirect network communication path e.g. for improved reliability or data rates;
- Emergency Services for Remote UE over UE-to-Network Relay.
- support path switching between direct NR Uu communication path and direct NR PC5 communication path;
4.2 Architecture Assumptions p. 13
- Architecture reference models defined in TS 23.304 are used as basis architecture for supporting 5G ProSe Ph2.
- Architecture reference model defined in TS 23.501 are used as basis architecture for supporting 5G ProSe Ph2.
- NG-RAN is considered; non-3GPP AN is not considered in this release.
- NR based PC5 and NR Uu are considered.
- For emergency service, the UE prioritises direct connection via any network, if available. If no such network is available, the UE attempts emergency service via 5G ProSe UE-to-Network Relay.
