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Content for  TS 23.304  Word version:  19.1.0

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1 Scope  2 References  3 Definitions of terms and abbreviations  3.1 Terms  3.2 Abbreviations 
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1  Scope  p. 11

The present document specifies the Stage 2 of the Proximity based Services (ProSe) features in 5GS. 5G ProSe features consist of: 5G ProSe Direct Discovery, 5G ProSe Direct Communication, 5G ProSe UE-to-Network Relay and 5G ProSe UE-to-UE Relay.
5G ProSe Direct Discovery identifies that 5G ProSe-enabled UEs are in proximity using NR.
5G ProSe Direct Communication enables establishment of communication paths between two or more 5G ProSe-enabled UEs that are in direct communication range using NR.
5G ProSe UE-to-Network Relay enables indirect Layer-2 and Layer-3 single-hop communication and Layer-3 multi-hop communication between the 5G network and UEs (e.g. for UEs that are out of coverage of the network).
5G ProSe UE-to-UE Relay enables indirect Layer-2 and Layer-3 single-.hop communication and Layer-3 multi-hop communication between two 5G ProSe End UEs.
Security aspects of ProSe in 5GS are defined in TS 33.503.
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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]
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".
[3]
TS 23.303: "Proximity-based services (ProSe); Stage 2".
[4]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[5]
TS 23.502: "Procedures for the 5G System (5GS); Stage 2".
[6]
TS 22.261: "Service requirements for next generation new services and markets; Stage 1".
[7]
TS 22.278: "Service requirements for the Evolved Packet System (EPS)".
[8]
TS 23.288: "Architecture enhancements for 5G System (5GS) to support network data analytics services".
[9]
TS 23.503: "Policy and Charging Control Framework for the 5G System".
[10]  Void.
[11]
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[12]
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
[13]
TS 38.304: "NR; User Equipment (UE) procedures in idle mode".
[14]
TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station in idle mode".
[15]
TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".
[16]
TS 38.331: "NR; Radio Resource Control (RRC); Protocol Specification".
[17]
RFC 4862:  "IPv6 Stateless Address Autoconfiguration".
[18]
RFC 3927:  "Dynamic Configuration of IPv4 Link-Local Addresses".
[19]
RFC 826:  "An Ethernet Address Resolution Protocol".
[20]  Void.
[21]
TR 23.752: "Study on system enhancement for Proximity based Services (ProSe) in the 5G System (5GS)".
[22]
TS 32.277: "Proximity-based Services (ProSe) charging".
[23]
TS 24.554: "Proximity-services (ProSe) in 5G System (5GS) protocol aspects; Stage 3".
[24]
RFC 2131:  "Dynamic Host Configuration Protocol".
[25]
RFC 4039:  "Rapid Commit Option for the Dynamic Host Configuration Protocol version 4 (DHCPv4)".
[26]  Void.
[27]  Void.
[28]
TS 38.351: "NR; Sidelink Adaptation Layer Protocol".
[29]
TS 33.503: "Security Aspects of Proximity based Services (ProSe) in the 5G System (5GS)".
[30]
TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".
[31]
TS 23.167: "3rd Generation Partnership Project; Technical Specification Group Services and Systems Aspects; IP Multimedia Subsystem (IMS) emergency sessions".
[32]
TS 23.041: "Technical realization of Cell Broadcast Service (CBS)".
[33]
TS 22.268: "Public Warning System (PWS) requirements".
[34]
TS 38.413: "NG-RAN; NG Application Protocol (NGAP)".
[35]
RFC 7181:  "The Optimized Link State Routing Protocol Version 2 (OLSRv2)".
[36]
RFC 6130:  "Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP)".
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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 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.
5G ProSe-enabled UE:
A UE that supports 5G ProSe requirements and associated procedures.
5G ProSe Direct Discovery:
A procedure employed by a 5G ProSe-enabled UE to discover other 5G ProSe-enabled UEs in its vicinity based on direct radio transmissions between the two UEs with NR technology.
5G ProSe Direct Communication:
A communication between two or more UEs in proximity that are 5G ProSe-enabled, by means of user plane transmission using NR technology via a path not traversing any network node.
5G ProSe UE-to-Network Relay:
A 5G ProSe-enabled UE that provides functionality to support connectivity to the network for 5G ProSe Remote UE(s).
5G ProSe Intermediate UE-to-Network Relay:
A 5G ProSe-enabled UE that provides functionality to support connectivity to the network for 5G ProSe Remote UE(s) by using the PC5 reference point with other 5G ProSe-enabled UEs. The 5G ProSe Intermediate UE-to-Network Relay is located on the path between 5G ProSe Remote UE and 5G ProSe UE-to-Network Relay.
5G ProSe Remote UE:
A 5G ProSe-enabled UE that communicates with a DN via zero or more 5G ProSe Intermediate UE-to-Network Relay(s) and a 5G ProSe UE-to-Network Relay.
5G ProSe UE-to-UE Relay:
A 5G ProSe-enabled UE that provides functionality to support connectivity between 5G ProSe End UEs.
5G ProSe End UE:
A 5G ProSe-enabled UE that connects with another 5G ProSe-enabled UE(s) via one or more 5G ProSe UE-to-UE Relay(s).
Application Layer ID:
An identifier identifying a 5G ProSe-enabled UE within the context of a specific application. The format of this identifier is outside the scope of 3GPP.
Direct Network Communication:
One mode of network communication, where there is no 5G ProSe UE-to-Network Relay between a UE and the 5G network.
Indirect Network Communication:
One mode of network communication, where there is a 5G ProSe UE-to-Network Relay between a UE and the 5G network.
Member ID:
An identifier uniquely identifying a member in the Application Layer managed group and that is managed by the ProSe application layer.
Mode of communication:
Mode of communication to be used by the 5G ProSe-enabled UE over PC5 reference point, i.e. broadcast mode, groupcast mode or unicast mode.
Open ProSe Discovery:
ProSe Direct Discovery without explicit permission from the 5G ProSe-enabled UE being discovered, according to TS 22.278.
ProSe identifier:
A globally unique identifier used to identify the ProSe Application associated with the ProSe operation in 5G ProSe Direct Discovery and 5G ProSe Direct Communication. In this Release, the "Application ID" defined in TS 23.303 can be used as the ProSe identifier in 5G ProSe Direct Discovery and in a consequent 5G ProSe Direct Communication.
Restricted ProSe Discovery:
ProSe Direct Discovery that only takes place with explicit permission from the 5G ProSe-enabled UE being discovered, according to TS 22.278.
Relay Service Code:
A Relay Service Code is used for the case of UE-to-Network Relay as well as for the case of UE-to-UE Relay. The definition for the case of UE-to-Network Relay is in TS 23.303. For the case of UE-to-UE Relay, the Relay Service Code is used to identify a connectivity service the 5G ProSe UE-to-UE Relay provides and the authorized users the 5G ProSe UE-to-UE Relay would offer service to. The definition of values of Relay Service Code for the case of UE-to-UE Relay is out of scope of this specification.
User Info ID:
The User Info ID is configured for Model A or Model B Group Member Discovery, 5G ProSe UE-to-Network Relay Discovery and 5G ProSe UE-to-UE Relay Discovery, either for public safety or commercial applications based on the policy of the HPLMN or via the ProSe application server that allocates it. The definition of values of User Info ID is out of scope of this specification.
For the purposes of the present document, the following term and definition given in TS 23.303 apply:
Application Layer Group ID
Destination Layer-2 ID
Discovery Entry ID
Discovery Filter
Discovery Query Filter
Discovery Response Filter
Geographical Area
Local PLMN
Model A
Model B
Metadata Index Mask
ProSe Application ID
ProSe Application Code
ProSe Application Mask
ProSe Query Code
ProSe Response Code
ProSe Restricted Code
ProSe Restricted Code Prefix
ProSe Restricted Code Suffix
ProSe Discovery UE ID
ProSe Layer-2 Group ID
Restricted ProSe Application User ID
Source Layer-2 ID
For the purposes of the present document, the following term and definition given in TS 23.287 apply:
NR Tx Profile
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3.2  Abbreviations  p. 14

For the purposes of the present document, the abbreviations given in TR 21.905 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.
5G DDNMF
5G Direct Discovery Name Management Function
AS layer
Access Stratum layer
NCGI
NR Cell Global ID
PDUID
ProSe Discovery UE ID
PFI
PC5 QoS Flow Identifier
PQI
PC5 5QI
ProSe
Proximity based Services
RPAUID
Restricted ProSe Application User ID
RSC
Relay Service Code
RSD
Rule Selection Descriptor
TAI
Tracking Area Identity
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