ETSI TS 123 503 V16.15.0 (2024-04)

5G; Policy and charging control framework for the 5G System (5GS); Stage 2 (3GPP TS 23.503 version 16.15.0 Release 16)

RTS/TSGS-0223503vgf0

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 2 - Architecture
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 18-Apr-2024

Standards Content (Sample)

TECHNICAL SPECIFICATION
5G;
Policy and charging control framework
for the 5G System (5GS);
Stage 2
(3GPP TS 23.503 version 16.15.0 Release 16)

3GPP TS 23.503 version 16.15.0 Release 16 1 ETSI TS 123 503 V16.15.0 (2024-04)

Reference
RTS/TSGS-0223503vgf0
Keywords
5G
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ETSI
3GPP TS 23.503 version 16.15.0 Release 16 2 ETSI TS 123 503 V16.15.0 (2024-04)
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ETSI
3GPP TS 23.503 version 16.15.0 Release 16 3 ETSI TS 123 503 V16.15.0 (2024-04)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
Introduction . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 11
4 High level architectural requirements . 11
4.1 General requirements . 11
4.2 Non-session management related policy control requirements . 12
4.2.1 Access and mobility related policy control requirements . 12
4.2.2 UE policy control requirements . 12
4.2.3 Network analytics information requirements . 12
4.2.4 Management of packet flow descriptions . 12
4.2.5 SMF selection management related policy control requirements . 12
4.2.6 Support for non-session management related network capability exposure . 13
4.3 Session management related policy control requirements . 13
4.3.1 General requirements . 13
4.3.2 Charging related requirements . 14
4.3.2.1 General . 14
4.3.2.2 Charging models . 14
4.3.2.3 Charging requirements . 14
4.3.2.4 Examples of Service Data Flow Charging . 15
4.3.3 Policy control requirements . 15
4.3.3.1 Gating control requirements . 15
4.3.3.2 QoS control requirements . 15
4.3.3.2.1 QoS control at service data flow level . 15
4.3.3.2.2 QoS control at QoS Flow level . 15
4.3.3.2.3 QoS control at PDU Session level . 16
4.3.3.3 Subscriber spending limits requirements . 16
4.3.4 Usage monitoring control requirements . 16
4.3.5 Application detection and control requirements . 17
4.3.6 Support for session management related network capability exposure . 17
4.3.7 Traffic steering control . 17
5 Architecture model and reference points . 17
5.1 General . 17
5.2 Reference architecture . 18
5.2.1 Non-roaming architecture . 18
5.2.2 Roaming architecture . 19
5.2.3 Void . 21
5.3 Service-based interfaces and reference points . 21
5.3.1 Interactions between PCF and AF . 21
5.3.2 Interactions between PCF and SMF . 21
5.3.3 Interactions between PCF and AMF . 21
5.3.4 Interactions between V-PCF and H-PCF . 22
5.3.5 Interactions between PCF and UDR . 22
5.3.6 Interactions between SMF and CHF . 22
5.3.7 Void . 23
5.3.8 Interactions between PCF and CHF . 23
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5.3.9 Interactions between SMF and NEF . 23
5.3.10 Interactions between NEF and PCF . 23
5.3.11 Interactions between NWDAF and PCF . 24
6 Functional description . 24
6.1 Overall description . 24
6.1.1 General . 24
6.1.1.1 PCF Discovery and Selection . 24
6.1.1.2 Binding an AF request targeting an UE address to the relevant PCF . 24
6.1.1.2.1 General . 24
6.1.1.2.2 The Binding Support Function (BSF). 25
6.1.1.3 Policy decisions based on network analytics. 26
6.1.2 Non-session management related policy control . 27
6.1.2.1 Access and mobility related policy control . 27
6.1.2.2 UE policy control . 28
6.1.2.2.1 General . 28
6.1.2.2.2 Distribution of the policies to UE . 29
6.1.2.3 Management of packet flow descriptions . 31
6.1.2.3.1 PFD management . 31
6.1.2.3.2 Packet Flow Description . 33
6.1.2.4 Negotiation for future background data transfer . 33
6.1.2.5 Policy Control Request Triggers relevant for AMF . 35
6.1.3 Session management related policy control . 37
6.1.3.1 General . 37
6.1.3.2 Binding mechanism . 37
6.1.3.2.1 General . 37
6.1.3.2.2 Session binding . 37
6.1.3.2.3 PCC rule authorization . 38
6.1.3.2.4 QoS Flow binding. 38
6.1.3.3 Reporting . 39
6.1.3.4 Credit management . 40
6.1.3.5 Policy Control Request Triggers relevant for SMF . 41
6.1.3.6 Policy control . 49
6.1.3.7 Service (data flow) prioritization and conflict handling . 49
6.1.3.8 Termination action . 50
6.1.3.9 Handling of packet filters provided to the UE by SMF . 50
6.1.3.10 IMS emergency session support . 50
6.1.3.11 Multimedia Priority Service support . 51
6.1.3.12 Redirection . 52
6.1.3.13 Resource sharing for different AF sessions . 52
6.1.3.14 Traffic steering control . 53
6.1.3.15 Resource reservation for services sharing priority . 53
6.1.3.16 3GPP PS Data Off . 54
6.1.3.17 Policy decisions based on spending limits . 55
6.1.3.18 Event reporting from the PCF . 56
6.1.3.19 Mission Critical Services support . 59
6.1.3.20 Access Traffic Steering, Switching and Splitting . 59
6.1.3.21 QoS Monitoring to assist URLLC Service . 60
6.1.3.22 AF session with required QoS . 61
6.1.3.23 Support of integration with Time Sensitive Networking. 61
6.1.3.24 Policy control for redundant PDU Sessions . 62
6.2 Network functions and entities . 63
6.2.1 Policy Control Function (PCF) . 63
6.2.1.1 General . 63
6.2.1.1.1 Session management related functionality . 63
6.2.1.1.2 Non-session management related functionality . 64
6.2.1.2 Input for PCC decisions . 64
6.2.1.3 Policy control subscription information management . 67
6.2.1.4 V-PCF . 70
6.2.1.5 H-PCF . 70
6.2.1.6 Application specific policy information management. 71
6.2.1.7 Usage monitoring . 71
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6.2.1.8 Sponsored data connectivity. 72
6.2.2 Session Management Function (SMF) . 72
6.2.2.1 General . 72
6.2.2.2 Service data flow detection . 74
6.2.2.3 Measurement . 75
6.2.2.4 QoS control . 76
6.2.2.5 Application detection . 77
6.2.2.6 Traffic steering . 77
6.2.2.7 Access Traffic Steering, Switching and Splitting . 77
6.2.3 Application Function (AF) . 77
6.2.4 Unified Data Repository (UDR) . 78
6.2.5 Charging Function (CHF) . 78
6.2.6 Void . 78
6.2.7 Network Exposure Function (NEF) . 78
6.2.8 Access and Mobility Management Function (AMF) . 79
6.2.9 Network Data Analytics Function (NWDAF) . 79
6.3 Policy and charging control rule . 79
6.3.1 General . 79
6.3.2 Policy and charging control rule operations . 91
6.4 PDU Session related policy information . 92
6.5 Access and mobility related policy information . 98
6.6 UE policy information . 99
6.6.1 Access Network Discovery & Selection Policy Information . 99
6.6.1.1 General . 99
6.6.1.2 UE selecting a WLANSP rule . 99
6.6.1.3 UE procedure for selecting a WLAN access based on WLANSP rules . 100
6.6.2 UE Route Selection Policy information . 100
6.6.2.1 Structure Description . 100
6.6.2.2 Configuration and Provision of URSP . 104
6.6.2.3 UE procedure for associating applications to PDU Sessions based on URSP . 104
6.6.3 V2X Policy information . 105
Annex A (informative): URSP rules example . 106
Annex B (informative): Deployment option to support of BSF and DRA coexistence due to
network migration . 110
Annex C (Normative): Support for Application Functions supporting Rx interface . 111
Annex D (informative): PCC usage for sponsored data connectivity . 113
D.1 General . 113
D.2 Reporting for sponsored data connectivity . 114
Annex E (informative): Change history . 115
History . 121

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Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
Introduction
For references to TS 23.203 [4] made in this document,
- the IP-CAN session of TS 23.203 [4] maps to the PDU Session in 5GC.
- the APN of TS 23.203 [4] maps to DNN in 5GC.
- the IP-CAN bearer of TS 23.203 [4] maps to the QoS Flow in 5GC.
- The PCRF of TS 23.203 [4] maps to the PCF in 5GC.
- The PCEF of TS 23.203 [4] maps to the combination of SMF and UPF in 5GC.
- The BBF shall be considered as being located in the PCEF.
- TDF related description does not apply.
- NBIFOM related description does not apply.
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1 Scope
The present document defines the Stage 2 policy and charging control framework for the 5G System specified in
TS 23.501 [2] and TS 23.502 [3].
The policy and charging control framework encompasses the following high level functions:
- Flow Based Charging for network usage, including charging control and online credit control, for service data
flows;
- Policy control for session management and service data flows (e.g. gating control, QoS control, etc.);
- Management for access and mobility related policies;
- Management of UE policy information.
Interworking with E-UTRAN connected to EPC is described in TS 23.501 [2].
TS 23.502 [3] contains the stage 2 procedures and flows for the policy and charging control framework and it is a
companion specification to this specification.
TS 32.255 [21] contains the functional description of the converged offline and online charging functionality for the 5G
System.
2 References
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] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 23.501: "Technical Specification Group Services and System Aspects; System
Architecture for the 5G System".
[3] 3GPP TS 23.502: "Procedures for the 5G System; Stage 2".
[4] 3GPP TS 23.203: "Policies and Charging control architecture; Stage 2".
[5] 3GPP TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[6] 3GPP TS 23.179: "Functional architecture and information flows to support mission-critical
communication service; Stage 2".
[7] Void.
[8] 3GPP TS 32.240: "Charging management; Charging architecture and principles".
[9] 3GPP TS 23.402: "Architecture enhancements for non-3GPP accesses".
[10] 3GPP TS 23.161: "Network-Based IP Flow Mobility (NBIFOM); Stage 2".
[11] 3GPP TS 23.261: "IP flow mobility and seamless Wireless Local Area Network (WLAN) offload;
Stage 2".
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3GPP TS 23.503 version 16.15.0 Release 16 8 ETSI TS 123 503 V16.15.0 (2024-04)
[12] 3GPP TS 23.167: "3rd Generation Partnership Project; Technical Specification Group Services
and Systems Aspects; IP Multimedia Subsystem (IMS) emergency sessions".
[13] 3GPP TS 29.507: "Access and Mobility Policy Control Service; Stage 3".
[14] Void.
[15] 3GPP TS 22.011: "Service Accessibility".
[16] 3GPP TS 23.221: "Architectural requirements".
[17] 3GPP TS 29.551: "5G System; Packet Flow Description Management Service; Stage 3".
[18] 3GPP TS 32.421: "Telecommunication management; Subscriber and equipment trace; Trace
concepts and requirements".
[19] 3GPP TS 24.526: "UE Equipment (UE) policies for 5G System (5GS); Stage 3".
[20] 3GPP TS 32.291: "Charging management; 5G system, Charging service; stage 3".
[21] 3GPP TS 32.255: "Telecommunication management; Charging management; 5G Data
connectivity domain charging; Stage 2".
[22] 3GPP TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[23] 3GPP TS 23.280: "Common functional architecture to support mission critical services; Stage 2".
[24] 3GPP TS 23.288: "Architecture enhancements for 5G System (5GS) to support network data
analytics services".
[25] 3GPP TS 23.216: "Single Radio Voice Call Continuity (SRVCC); Stage 2".
[26] 3GPP TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2".
[27] 3GPP TS 23.316: "Wireless and wireline convergence access support for the 5G System (5GS)".
[28] 3GPP TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-
Everything (V2X) services".
[29] 3GPP TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP)
and Session Description Protocol (SDP); Stage 3".
[30] 3GPP TS 24.237: "IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem
(IMS) Service Continuity; Stage 3".
[31] 3GPP TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and
interaction".
[32] 3GPP TS 29.510: "5G System; Network Function Repository Services; Stage 3".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1], TS 23.501 [2],
TS 23.502 [3] 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 [1].
Application detection filter: A logic used to detect packets generated by an application based on extended inspection
of these packets, e.g. header and/or payload information, as well as dynamics of packet flows. The logic is entirely
internal to a UPF, and is out of scope of this specification.
Application identifier: An identifier referring to a specific application detection filter.
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Application service provider: A business entity responsible for the application that is being / will be used by a UE,
which may be either an AF operator or has an association with the AF operator.
Authorised QoS: The maximum QoS that is authorised for a service data flow. In the case of an aggregation of
multiple service data flows within one QoS Flow, the combination of the "Authorised QoS" information of the
individual service data flows is the "Authorised QoS" for the QoS Flow. It contains the 5QI and the data rate.
Binding: The association between a service data flow and the QoS Flow transporting that service data flow.
Binding mechanism: The method for creating, modifying and deleting bindings.
Charging control: The process of associating packets, belonging to a service data flow, to a charging key and applying
online charging and/or offline charging, as appropriate.
Charging key: information used by the CHF for rating purposes.
Detected application traffic: An aggregate set of packet flows that are generated by a given application and detected
by an application detection filter.
Dynamic PCC Rule: a PCC rule, for which the definition is provided to the SMF by the PCF.
Gating control: The process of blocking or allowing packets, belonging to a service data flow / detected application's
traffic, to pass through to the UPF.
Monitoring key: information used by the SMF and PCF for usage monitoring control purposes as a reference to a given
set of service data flows or application (s), that all share a common allowed usage on a per UE and DNN basis.
Non-3GPP access network selection information: It consists of ePDG identifier configuration, N3IWF identification
and non-3GPP access node selection information, as defined in clause 6.3.6.1 in TS 23.501 [2].
Non-Seamless Offload: A capability of the UE to access the data networks via non-3GPP access (e.g. WLAN radio
access) outside of a PDU Session.
Operator-controlled service: A service for which complete PCC rule information, including service data flow filter
information, is available in the PCF through configuration and/or dynamic interaction with an AF.
Operating System (OS): Collection of UE software that provides common services for applications.
Operating System Identifier (OSId): An identifier identifying the operating system.
OS specific Application Identifier (OSAppId): An identifier associated with a given application and uniquely
identifying the application within the UE for a given operating system.
Packet flow: A specific user data flow from and/or to the UE.
Packet Flow Description (PFD): A set of information enabling the detection of application traffic provided by a 3rd
party service provider.
PCC decision: A PCF decision for policy and charging control provided to the SMF (consisting of PCC rules and PDU
Session related attributes), a PCF decision for access and mobility related control provided to the AMF, a PCF decision
for UE policy information provided to the UE or a PCF decision for background data transfer policy provided to the AF.
PCC rule: A set of information enabling the detection of a service data flow and providing parameters for policy
control and/or charging control and/or other control or support information. The possible information is described in
clause 6.3.1.
Policy control: The process whereby the PCF indicates to the SMF how to control the QoS Flow. Policy control
includes QoS control and/or gating control.
Policy Control Request trigger report: a notification, possibly containing additional information, of an event which
occurs that corresponds with a Policy Control Request trigger.
Policy Control Request trigger: defines a condition when the SMF shall interact again with the PCF.
Policy counter: A mechanism within the CHF to track spending applicable to a subscriber.
Policy counter identifier: A reference to a policy counter in the CHF for a subscriber.
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Policy counter status: A label whose values are not standardized and that is associated with a policy counter's value
relative to the spending limit(s) (the number of possible policy counter status values for a policy counter is one greater
than the number of thresholds associated with that policy counter, i.e. policy counter status values describe the status
around the thresholds). This is used to convey information relating to subscriber spending from CHF to PCF. Specific
labels are configured jointly in CHF and PCF.
Policy Section: A Policy Section is identified by a Policy Section Identifier and consists of one or multiple URSP
rule(s) or one or multiple WLANSP rule(s) or non-3GPP access network selection information or a combination of
WLANSP rule(s) and non-3GPP access network selection information.
Predefined PCC Rule: a PCC rule that has been provisioned directly into the SMF by the operator.
Redirection: Redirect the detected service traffic to an application server (e.g. redirect to a top-up / service
provisioning page).
Service data flow: An aggregate set of packet flows carried through the UPF that matches a service data flow template.
Service data flow filter: A set of packet flow header parameter values/ranges used to identify one or more of the
packet flows in the UPF. The possible service data flow filters are defined in clause 6.2.2.2.
Service data flow filter identifier: A scalar that is unique for a specific service data flow (SDF) filter within a PDU
Session.
Service data flow template: The set of service data flow filters in a PCC Rule or an application identifier in a PCC rule
referring to an application detection filter in the SMF or in the UPF, required for defining a service data flow.
Service identifier: An identifier for a service. The service identifier provides the most detailed identification, specified
for flow based charging, of a service data flow. A concrete instance of a service may be identified if additional AF
information is available (further details to be found in clause 6.3.1).
Session based service: An end user service requiring application level signalling, which is separated from service
rendering.
Spending limit: A spending limit is the usage limit of a policy counter (e.g. monetary, volume, duration) that a
subscriber is allowed to consume.
Spending limit report: a notification, containing the current policy counter status generated from the CHF to the PCF.
Subscribed guaranteed bandwidth QoS: The per subscriber, authorized cumulative guaranteed bandwidth QoS which
is provided by the UDR to the PCF.
Subscriber category: is a means to group the subscribers into different classes, e.g. gold user, silver user and bronze
user.
UE Local Configuration: Information about the association of an application to either a PDU Session or to non-
seamless Offload is configured in the Mobile Termination (MT) and in the Terminal Equipment (TE). For example, UE
Local Configuration can include operator specific configuration (e.g. operator provided S-NSSAI(s)), or application
specific parameters to set up a PDU Session or end user configuration for specific applications.
UE policy information: Policy information preconfigured in the UE and/or provisioned to the UE for access selection
(i.e. ANDSP), PDU Session selection (i.e. URSP) and/or V2X communications (i.e. V2XP).
Uplink binding verification: The network enforcement of terminal compliance with the negotiated uplink traffic
mapping to QoS Flows.
User Preferences On Non-3GPP Access Selection: The list of configuration parameters provided by a layer (e.g.
application) abov
...