5G; 5G System; Spending Limit Control Service; Stage 3 (3GPP TS 29.594 version 15.5.0 Release 15)

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Publication Date
13-Oct-2019
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12 - Completion
Completion Date
14-Oct-2019
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ETSI TS 129 594 V15.5.0 (2019-10) - 5G; 5G System; Spending Limit Control Service; Stage 3 (3GPP TS 29.594 version 15.5.0 Release 15)
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ETSI TS 129 594 V15.5.0 (2019-10)
TECHNICAL SPECIFICATION
5G;
5G System;
Spending Limit Control Service;
Stage 3
(3GPP TS 29.594 version 15.5.0 Release 15)
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3GPP TS 29.594 version 15.5.0 Release 15 1 ETSI TS 129 594 V15.5.0 (2019-10)
Reference
RTS/TSGC-0329594vf50
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3GPP TS 29.594 version 15.5.0 Release 15 2 ETSI TS 129 594 V15.5.0 (2019-10)
Intellectual Property Rights
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Legal Notice

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ETSI
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3GPP TS 29.594 version 15.5.0 Release 15 3 ETSI TS 129 594 V15.5.0 (2019-10)
Contents

Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ............................................................................................................................................................. 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

3 Definitions and abbreviations ................................................................................................................... 7

3.1 Definitions .......................................................................................................................................................... 7

3.2 Abbreviations ..................................................................................................................................................... 7

4 Nchf_SpendingLimitControl Service ....................................................................................................... 7

4.1 Service Description ............................................................................................................................................ 7

4.1.1 Overview ...................................................................................................................................................... 7

4.1.2 Service Architecture ..................................................................................................................................... 7

4.1.3 Network Functions ........................................................................................................................................ 8

4.1.3.1 Charging Function (CHF) ....................................................................................................................... 8

4.1.3.2 NF Service Consumers ............................................................................................................................ 8

4.2 Service Operations ............................................................................................................................................. 8

4.2.1 Introduction................................................................................................................................................... 8

4.2.2 Nchf_SpendingLimitControl_Subscribe service operation .......................................................................... 9

4.2.2.1 General .................................................................................................................................................... 9

4.2.2.2 Initial spending limit retrieval ................................................................................................................. 9

4.2.2.3 Intermediate spending limit report retrieval .......................................................................................... 11

4.2.3 Nchf_SpendingLimitControl_Unsubscribe service operation .................................................................... 12

4.2.3.1 General .................................................................................................................................................. 12

4.2.3.2 Unsubscribe from spending limit reporting ........................................................................................... 12

4.2.4 Nchf_SpendingLimitControl_Notify service operation .............................................................................. 13

4.2.4.1 General .................................................................................................................................................. 13

4.2.4.2 Spending limit report............................................................................................................................. 13

4.2.4.3 Subscription termination request by CHF ............................................................................................. 14

5 Nchf_SpendingLimitControl Service API ............................................................................................. 15

5.1 Introduction ...................................................................................................................................................... 15

5.2 Usage of HTTP ................................................................................................................................................. 15

5.2.1 General ........................................................................................................................................................ 15

5.2.2 HTTP standard headers ............................................................................................................................... 15

5.2.2.1 General .................................................................................................................................................. 15

5.2.2.2 Content type .......................................................................................................................................... 15

5.2.3 HTTP custom headers ................................................................................................................................. 15

5.2.3.1 General .................................................................................................................................................. 15

5.3 Resources ......................................................................................................................................................... 16

5.3.1 Resource Structure ...................................................................................................................................... 16

5.3.2 Resource: Spending Limit Retrieval Subscriptions (Collection) ................................................................ 16

5.3.2.1 Description ............................................................................................................................................ 16

5.3.2.2 Resource definition ............................................................................................................................... 16

5.3.2.3 Resource Standard Methods .................................................................................................................. 17

5.3.2.3.1 POST ............................................................................................................................................... 17

5.3.2.4 Resource Custom Operations ................................................................................................................ 17

5.3.3 Resource: Individual Spending Limit Retrieval Subscription (Document) ................................................ 17

5.3.3.1 Description ............................................................................................................................................ 17

5.3.3.2 Resource definition ............................................................................................................................... 17

5.3.3.3 Resource Standard Methods .................................................................................................................. 18

5.3.3.3.1 PUT ................................................................................................................................................. 18

5.3.3.3.2 DELETE .......................................................................................................................................... 18

5.4 Custom Operations without associated resources............................................................................................. 19

ETSI
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3GPP TS 29.594 version 15.5.0 Release 15 4 ETSI TS 129 594 V15.5.0 (2019-10)

5.5 Notifications ..................................................................................................................................................... 19

5.5.1 General ........................................................................................................................................................ 19

5.5.2 Spending limit notification ......................................................................................................................... 19

5.5.2.1 Description ............................................................................................................................................ 19

5.5.2.2 Target URI ............................................................................................................................................ 19

5.5.2.3 Standard Methods ................................................................................................................................. 19

5.5.2.3.1 POST ............................................................................................................................................... 19

5.5.3 Subscription Termination ........................................................................................................................... 20

5.5.3.1 Description ............................................................................................................................................ 20

5.5.3.2 Target URI ............................................................................................................................................ 20

5.5.3.3 Standard Methods ................................................................................................................................. 20

5.5.3.3.1 POST ............................................................................................................................................... 20

5.6 Data Model ....................................................................................................................................................... 21

5.6.1 General ........................................................................................................................................................ 21

5.6.2 Structured data types ................................................................................................................................... 21

5.6.2.1 Introduction ........................................................................................................................................... 21

5.6.2.2 Type SpendingLimitContext ................................................................................................................. 22

5.6.2.3 Type SpendingLimitStatus .................................................................................................................... 23

5.6.2.4 Type PolicyCounterInfo ........................................................................................................................ 23

5.6.2.5 Type PendingPolicyCounterStatus ........................................................................................................ 23

5.6.2.6 Type SubscriptionTerminationInfo ....................................................................................................... 24

5.6.3 Simple data types and enumerations ........................................................................................................... 24

5.6.3.1 Introduction ........................................................................................................................................... 24

5.6.3.2 Simple data types .................................................................................................................................. 24

5.6.3.3 Enumeration: TerminationCause ........................................................................................................... 24

5.7 Error handling .................................................................................................................................................. 24

5.7.1 General ........................................................................................................................................................ 24

5.7.2 Protocol Errors ............................................................................................................................................ 24

5.7.3 Application Errors ...................................................................................................................................... 25

5.8 Feature negotiation ........................................................................................................................................... 25

5.9 Security ............................................................................................................................................................ 25

Annex A (normative): OpenAPI specification .................................................................................. 26

A.1 General ................................................................................................................................................... 26

A.2 Nchf_SpendingLimitControl Service API ............................................................................................. 26

Annex B (informative): Change history .............................................................................................. 31

History .............................................................................................................................................................. 34

ETSI
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3GPP TS 29.594 version 15.5.0 Release 15 5 ETSI TS 129 594 V15.5.0 (2019-10)
Foreword

This Technical Specification has been produced by the 3 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.

ETSI
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3GPP TS 29.594 version 15.5.0 Release 15 6 ETSI TS 129 594 V15.5.0 (2019-10)
1 Scope

The present specification provides the stage 3 definition of the Spending Limit Control Service of the 5G System.

The 5G System Architecture is defined in 3GPP TS 23.501 [2]. The stage 2 definition and related procedures for the

Spending Limit Control Service are specified in 3GPP TS 23.502 [3] and 3GPP TS 23.503 [6].

The 5G System stage 3 call flows are provided in 3GPP TS 29.513 [12].

The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition

are specified in 3GPP TS 29.500 [4] and 3GPP TS 29.501 [5].

The Spending Limit Control Service is provided by the Charging Function (CHF) and enables the NF service consumer

to retrieve policy counter status information. The internal CHF functionality for policy counter management

provisioning is specified in 3GPP TS 32.240 [7].
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: "System Architecture for the 5G System; Stage 2".
[3] 3GPP TS 23.502: "Procedures for the 5G System; Stage 2".

[4] 3GPP TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".

[5] 3GPP TS 29.501: "5G System; Principles and Guidelines for Services Definition; Stage 3".

[6] 3GPP TS 23.503: "Policy and Charging Control Framework for the 5G System; Stage 2".

[7] 3GPP TS 32.240: "Charging architecture and principles; Stage 2".
[8] IETF RFC 7540: "Hypertext Transfer Protocol Version 2 (HTTP/2)".
[9] OpenAPI: "OpenAPI 3.0.0 Specification", https://github.com/OAI/OpenAPI-
Specification/blob/master/versions/3.0.0.md.

[10] IETF RFC 8259: "The JavaScript Object Notation (JSON) Data Interchange Format".

[11] 3GPP TS 29.571: "5G System; Common Data Types for Service Based Interfaces".

[12] 3GPP TS 29.513: "5G System; Policy and Charging Control signalling flows and QoS parameter

mapping; Stage 3".
[13] IETF RFC 7807: "Problem Details for HTTP APIs".
[14] 3GPP TS 33.501: "Security architecture and procedures for 5G system".
[15] IETF RFC 6749: "The OAuth 2.0 Authorization Framework".
[16] 3GPP TS 29.510: "5G System; Network Function Repository Services; Stage 3".
ETSI
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3GPP TS 29.594 version 15.5.0 Release 15 7 ETSI TS 129 594 V15.5.0 (2019-10)
[17] 3GPP TR 21.900: "Technical Specification Group working methods".
3 Definitions and abbreviations
3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following

apply. A term defined in the present document takes precedence over the definition of the same term, if any, in

3GPP TR 21.905 [1].
Nchf: Service-based interface exhibited by Charging Function.
3.2 Abbreviations

For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An

abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in

3GPP TR 21.905 [1].
CCS Converged Charging System
CHF Charging Function
CTS Charging Trigger Function
GPSI Generic Public Subscription Identifier
NF Network Function
NRF Network Repository Function
PCF Policy Control Function
SUPI Subscription Permanent Identifier
4 Nchf_SpendingLimitControl Service
4.1 Service Description
4.1.1 Overview

The Nchf_SpendingLimitControl service, as defined in 3GPP TS23.502 [3] and 3GPP TS23.503 [6], is provided by the

Charging Function (CHF).

The Nchf_SpendingLimitControl service enables the NF service consumer to retrieve policy counter status information

per UE from the CHF by subscribing to spending limit reporting (i.e. notifications of policy counter status changes).

If the spending limit reporting is no more required the Nchf_SpendingLimitControl service enables the NF service

consumer to unsubscribe from the reporting.
4.1.2 Service Architecture

The Nchf_SpendingLimitControl service is provided by the CHF and consumed by the PCF, as shown in figure 4.1.2-1

for the SBI representation model and in figure 4.1.2-2 for the reference point representation model.

ETSI
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3GPP TS 29.594 version 15.5.0 Release 15 8 ETSI TS 129 594 V15.5.0 (2019-10)
CHF
Nchf
Nchf_SpendingLimitControl
PCF

Figure 4.1.2-1: Nchf_SpendingLimitContol service architecture, SBI representation

CHF
N28
PCF

Figure 4.1.2-2: Nchf_SpendingLimitContol service architecture, reference point representation

4.1.3 Network Functions
4.1.3.1 Charging Function (CHF)

The Charging Function (CHF) is part of the Converged Charging System (CCS). The CHF provides the

Nchf_SpendingLimitControl service and is specified in 3GPP TS 32.240 [7].
4.1.3.2 NF Service Consumers

The PCF is the known NF service consumer, as defined in 3GPP TS 23.502 [3]. The NF service consumer accesses

policy counter status information relating to the subscriber spending from the CHF and uses the status of each relevant

policy counter as input to its policy decision as required by the decision logic.

4.2 Service Operations
4.2.1 Introduction

The service operations defined for the Nchf_SpendingLimitControl service are shown in table 4.2.1-1.

ETSI
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3GPP TS 29.594 version 15.5.0 Release 15 9 ETSI TS 129 594 V15.5.0 (2019-10)
Table 4.2.1-1: Nchf_SpendingLimitControl Service Operations
Service operation name Description Initiated by

Nchf_SpendingLimitControl_Subscribe This service operation is used by an NF NF service

service consumer to subscribe to notification consumer (PCF)
of changes in the status of the policy counters
available and retrieval of the status of the
policy counters for which subscription is
accepted.

Nchf_SpendingLimitControl_Unsubscribe This service operation is used by an NF NF service

service consumer to unsubscribe from consumer (PCF)
notification of changes in the status of all
policy counters.

Nchf_SpendingLimitControl_Notify This service operation is used by the CHF to CHF

notify the NF service consumers about the
change of the status of the subscribed policy
counters. Alternatively, it can be used by the
CHF to notify that the status for one or multiple
subscribed policy counter will change in the
future, indicating the time when this change
shall be applied. Alternatively, it is also used to
notify the NF service consumer of the removal
of a subscriber from the CHF system for the
purpose that the NF service consumer can
terminate the subscriptions of all policy
counters of the subscriber.
4.2.2 Nchf_SpendingLimitControl_Subscribe service operation
4.2.2.1 General

The Nchf_SpendingLimitControl_Subscribe service operation is used by the NF service consumer to subscribe to

notification of changes in the status of the policy counters available and to retrieve the status of the policy counters for

which the subscription is accepted. The following procedures are related to the subscribe service operation:

- initial spending limit retrieval; and
- intermediate spending limit report retrieval.
4.2.2.2 Initial spending limit retrieval

Figure 4.2.2.2-1 shows the scenario where the NF service consumer sends a request to the CHF to retrieve the status of

policy counters available at the CHF and to subscribe to spending limit reporting (see also 3GPP TS 23.502 [3],

figure 4.16.8.2.1).
NF service
CHF
consumer
1. POST…/subscriptions
2. 201 Created

Figure 4.2.2.2-1: NF service consumer subscribes to retrieve policy counter status and spending limit

reporting
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3GPP TS 29.594 version 15.5.0 Release 15 10 ETSI TS 129 594 V15.5.0 (2019-10)

The NF service consumer shall send an HTTP POST request to the resource "{apiRoot}/nchf-

spendinglimitcontrol/v1/subscriptions" representing the "Spending Limit RetrievalSubscriptions", as shown in

figure 4.2.2.2-1, step 1, to create a subscription for retrieval of the policy counter status and spending limit reporting.

The "SpendingLimitContext" data structure provided in the request body shall include:

- the Subscription Permanent Identifier (SUPI) encoded in the "supi" attribute; and

- the notification correlation target address encoded in the "notifUri" attribute.

The "SpendingLimitContext" data structure provided in the request body may include:

- the General Public Subscription Identifier (GPSI) encoded in the "gpsi" attribute; and

- Event Filter information "list of policy counter identifier(s)" encoded in the "policyCounterIds" attribute. The

"policyCounterIds" attribute shall contain the list of policy counter identifiers to be subscribed to. If the

"policyCounterIds" attribute is omitted, the subscription is to all available policy counters.

If the CHF cannot successfully fulfil the received HTTP POST request due to an internal CHF error or due to the error

in the HTTP POST request, the CHF shall send the HTTP error response as specified in subclause 5.7.

If the subscriber specified in the request i
...

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