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Content for  TR 32.846  Word version:  17.0.0

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1  ScopeWord‑p. 7

The present document studies on charging aspects of Proximity-based Services in 5GS based on TS 23.304.
The charging aspects related to the Proximity-based Services in 5GS are covered within the scope:
  • Charging architecture, for supporting charging of ProSe Direct Discovery and Direct Communication related to Public Safety and commercial proximity service.
  • Charging principles, scenarios and potential requirements related to the ProSe service in 5GS.
  • Potential charging solutions for the Proximity-based Services in 5GS.
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2  ReferencesWord‑p. 7

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]
TR 23.752: "Study on system enhancement for Proximity based Services (ProSe) in the 5G System (5GS)".
[4]
TS 32.277: "Proximity-based Services (ProSe) charging".
[5]
TS 32.240: "Telecommunication management; Charging management; Charging architecture and principles".
[6]
TS 32.290: "Telecommunication management; Charging management; 5G system; Services, operations and procedures of charging using Service Based Interface (SBI)"
[7]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[8]
TS 23.303: "Proximity-based services (ProSe); Stage 2".
[9]
TS 22.115: "Service aspects; Charging and billing".
[10]
TS 28.201: "Charging management; Network slice performance and analytics charging in the 5G System (5GS); Stage 2".
[11]
TS 23.304: "Proximity based Services (ProSe) in the 5G System (5GS)".
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3  Definitions of terms, symbols and abbreviationsWord‑p. 7

3.1  TermsWord‑p. 7

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 Direct Discovery:
A procedure employed by a ProSe-enabled UE to discover other ProSe-enabled UEs in its vicinity by using only the capabilities of the two UEs with NR technology. See TS 23.304.
5G ProSe Direct Communication:
A communication between two or more UEs in proximity that are ProSe-enabled, by means of user plane transmission using NR technology via a path not traversing any network node. See 3GPP TR TS 23.304.
5G ProSe UE-to-Network Relay:
A UE that provides functionality to support connectivity to the network for Remote UE(s). See TS 23.304.
Remote UE:
A 5G ProSe-enabled UE that communicates with a DN via a 5G ProSe UE-to-Network Relay. See TS 23.304.
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3.2  SymbolsWord‑p. 8

Void.

3.3  AbbreviationsWord‑p. 8

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.
5GS
5G System
CDR
Charging Data Record
CHF
Charging Function
CTF (AMC)
Charging Trigger Function (Accounting Metrics Collection)
CTF (ADF)
Charging Trigger Function (Accounting Data Forwarding)
DDNMF
Direct Discovery Name Management Function
ProSe
Proximity-based Services
PFI
PC5 QoS Flow Identifier
PQI
PC5 5QI
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4  Concepts and overviewWord‑p. 8

Proximity-based Services (ProSe) are services that can be provided by the 3GPP system based on UEs being in proximity to each other. Proximity-based Services has been developed in EPS to support both commercial and public safety services. Proximity Services (specifically the direct communication) has been enhanced to support V2X services over LTE.
In 5GS, the 3GPP system enablers for ProSe include the following functions:
  • Direct Discovery;
  • Direct Communication;
  • UE-to-Network Relay;
The present document aims to describe the converged charging for the Proximity-based Services (ProSe) in 5GS, based on the stage 2 description of ProSe in TS 23.303.
As indicated in TS 32.277, the offline and online charging description for the Proximity-based Services was specified based on EPS system, including the support of charging support of ProSe Direct Discovery, one-to-many Direct Communication, and one-to-one Direct Communication including UE-to-Network Relay (for public safety use), and EPC based discovery.
When mapped to 5GS, the study will focus on how to accommodate charging ProSe Direct Discovery and Direct Communication over NR based PC5 for commercial services and public safety based on the 5G service-based architecture.
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5  Architecture considerationsWord‑p. 9

5.1  High level ProSe architectureWord‑p. 9

The scope of the present document is Proximity-based Service charging in 5GS, related to architecture reference as follows:
  • Architecture reference model defined in TS 23.501 are used as basis architecture for supporting ProSe in 5GS.
  • Architecture reference models defined in TS 23.304 are used as reference architecture for supporting ProSe in 5GS.

5.2  Potential converged charging architectures for ProSeWord‑p. 9

5.2.1  GeneralWord‑p. 9

The converged charging architectures for ProSe in 5GS should support charging for the following services:
  • ProSe Direct Discovery, including ProSe open Direct Discovery and restricted Direct Discovery, and
  • ProSe UE-to-Network Relay Discovery, and
  • ProSe Direct communication, including Broadcast and Groupcast Direct Communication and Unicast Direct Communication, and
  • ProSe Direct Communication via ProSe UE-to-Network Relay.
Details on the interfaces and functions can be found in TS 32.240 for the general architecture components Nchf is described in TS 32.290.
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5.2.2  ProSe Direct Discovery converged charging architectureWord‑p. 9

Figure 6.1.4.1.2-1 and Figure 6.1.4.1.2-2 illustrates the options architecture for converged charging architecture for the ProSe Direct Discovery, including ProSe UE-to-Network Relay Discovery.

5.2.3  ProSe Direct Communication converged charging architectureWord‑p. 9

Figure 6.2.4.1.2-1 and Figure 6.2.4.1.2-2 illustrates the options architecture for converged charging architecture for the ProSe Direct Communication, including ProSe Direct Communication via ProSe UE-to-Network Relay.

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