Content for TR 28.839 Word version: 18.1.0

3.1 Terms 3.2 Symbols 3.3 Abbreviations 4.1 General 4.2 Business Roles for the TSN Charging
...

1 Scope p. 7

The present document studies the charging aspects for the support of Time Sensitive Networking based on requirements from TS 22.261 and TS 22.104 of 5G system and vertical domains, the architecture, functional and protocol to enable Time Sensitive Communication and Time Synchronization, described in TS 23.501, TS 23.502, TS 23.503, TR 23.734 and TS 24.519.

The following are studied:

possible charging scenarios and requirements for 5G System integration as a bridge in TSN network;
possible charging scenarios and requirements for the Time Sensitive Communications and Time Synchronization service;
possible new charging aspects for the following key items:
- QoS requirements for TSN (e.g. support for TSC QoS Flows, QoS mapping from TSN QoS information to 5GS QoS profile);
- Edge computing scenario support in TSN Transport (e.g. DS-TT and NW-TT);
- charging enhancement (e.g. new triggers) due to policy control for TSN traffic which may impact the charging;
potential charging solutions for the above charging scenarios and requirements and taking in account TSN application requirements (e.g. instance survival time).

2 References 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 22.261: "Service requirements for the 5G system; Stage 1".

[3]

TS 23.501: "System architecture for the 5G System (5GS); Stage 2".

[4]

TS 23.502: "Procedures for the 5G System (5GS); Stage 2".

[5]

TS 23.503: "Policy and charging control framework for the 5G System (5GS); Stage 2".

[6]

TR 23.734: "Study on enhancement of 5G System (5GS) for vertical and Local Area Network (LAN) services".

[7]

TS 22.104: "Service requirements for cyber-physical control applications in vertical domains".

[8]

TS 24.519: "5G System (5GS); Time-Sensitive Networking (TSN) Application Function (AF) to Device-Side TSN Translator (DS-TT) and Network-Side TSN Translator (NW-TT) protocol aspects; Stage 3."

[9]

TS 32.254: "Telecommunication management; Charging management; Exposure function Northbound Application Program Interfaces (APIs) charging".

[10]

TR 32.255: "Telecommunication management; Charging management; 5G data connectivity domain charging; Stage 2".

3 Definitions of terms, symbols and abbreviations p. 8

3.1 Terms p. 8

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.

survival time:

time that an application consuming a communication service may continue without an anticipated message. as defined in TS 22.261

3.2 Symbols p. 8

For the purposes of the present document, the following symbols apply:

N84

Reference point between TSCTSF and NEF

N85

Reference point between TSCTSF and NEF

N86

Reference point between TSCTSF and AF

N87

Reference point between TSCTSF and UDR

Ntsctsf

Service-based interface exhibited by TSCTSF

3.3 Abbreviations 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

ASTI

Access Stratum TIme

CNC

Centralized Network Configuration

DS-TT

Device-Side TSN Translator

MNO

Mobile Network Operator

NW-TT

Network-Side TSN Translator

Time Synchronization

TSC

Time Sensitive Communications

TSCTSF

Time Sensitive Communication and Time Synchronization function

TSN

Time-Sensitive Networking

TSN AF

Time Sensitive Networking Application Function

TSN-SC

TSN Service Customer

TSN-SP

TSN Service Provider

4 Background p. 8

4.1 General p. 8

As per the requirements described in TS 22.261 and TS 22.104 about clock synchronization, time-sensitive communication, the corresponding description to support of integration with TSN and enablers for Time Sensitive Communications and Time Synchronization are specified in clause 5.27 and clause 5.28 of TS 23.501:

5GS acts as a Layer 2 Ethernet Bridge. When integrated with IEEE TSN network, 5GS functions acts as one or more TSN Bridges of the TSN network. The configuration of the 5GS Bridge can be provided by TSN AF and CNC.
5G System features that can be used independently or in combination to enable time-sensitive communication and time synchronization.

Figure 4.1-1 describes the architecture for 5GS appearing as TSN bridge, specified in clause 4.4.8.2 of TS 23.501 and Figure 4.1-2 describes the architecture for AF requested support of Time Sensitive Communication and Time Synchronization, specified in clause 4.4.8.3 of TS 23.501.

Copy of original 3GPP image for 3GPP TS 28.839, Fig. 4.1-1: System architecture view with 5GS appearing as TSN bridge

Figure 4.1-1: System architecture view with 5GS appearing as TSN bridge
(⇒ copy of original 3GPP image)

Copy of original 3GPP image for 3GPP TS 28.839, Fig. 4.1-2: Architecture to enable Time Sensitive Communication and Time Synchronization services

Figure 4.1-2: Architecture to enable Time Sensitive Communication and Time Synchronization services
(⇒ copy of original 3GPP image)

4.2 Business Roles for the TSN Charging p. 9

5G system as the 5GS Bridge to support the integration with TSN, the TSN charging can be built upon the business roles as following, related to 5G Bridge management, TSN traffic transmission over the PDU Session:

Mobile Network Operator (MNO): provides 5GS system as the 5GS Bridge.
TSN Service Provider (TSN-SP): provides communication services for TSN Bridge use, e.g. enterprise.
TSN Service Customer (TSN-SC): consumes communication services for TSN Bridge use, e.g. end user, enterprise.

5G System features that can be used independently or in combination to enable time-sensitive communication and time synchronization, the TSN charging can be built upon the business roles as following, related to the time synchronization configuration and capability, including the exposure of the time sensitive service, time-sensitive communication:

Mobile Network Operator (MNO): provides the 5GS system features.
TS Service Provider (TS-SP): provides communication services for time-sensitive communication and time synchronization, e.g. enterprise.
TS Service Customer (TS-SC): consumes communication services for time-sensitive communication and time synchronization, e.g. end user, enterprise.

In deployments, there could be business scenarios where one or more of the business roles are supported by a single enterprise. The present document does not impose any restrictions to the possible deployment scenarios.