3GPP TSG-SA5 Meeting #162	S5-24xxxx

Goteborg, Sweden, 25 - 29 August 2025

Source:	Huawei

Title:	New SID on charging reliability enhancement

Document for:	Approval

Agenda Item:	7.2

3GPP™ Work Item Description

Information on Work Items can be found at http://www.3gpp.org/Work-Items
See also the 3GPP Working Procedures, article 39 and the TSG Working Methods in 3GPP TR 21.900

Title: New SID on charging reliability enhancement

Acronym: FS_RE_CH

Unique identifier:

Potential target Release:	Rel-20

1	Impacts

{For Normative work, identify the anticipated impacts. For a Study, identify the scope of the study}

Affects:	UICC apps	ME	AN	CN	Others (specify)
Yes	X
No	X	X	X	X
Don't know

2	Classification of the Work Item and linked work items

2.1	Primary classification

This work item is a …

X	Study
Normative – Stage 1
Normative – Stage 2
Normative – Stage 3
Normative – Other*

* Other = e.g. testing

2.2	Parent Work Item

For a brand-new topic, use “N/A” in the table below. Otherwise indicate the parent Work Item.

Parent Work / Study Items
Acronym	Working Group	Unique ID	Title (as in 3GPP Work Plan)
N/A

2.3	Other related Work Items and dependencies

Other related Work /Study Items (if any)
Unique ID	Title	Nature of relationship
N/A

3	Justification

For 5G charging, the CHF generates CDRs based on charging information collected from NF consumers through the Nchf interface. Any Nchf related failures will consequently affect the experience of using service.

In the exiting specifications, there are a few descriptions regarding charging reliability as specified in clause 5.5.1 of TS 32.290. But it’s not enough for implementation and deployment, e.g., several charging reliability related scenarios as follows:

The CTF detected failure scenarios.

In case the CHF is determined not reachable, the charging session may be released or not:

-	When the charging session is released, whether and how to send the charging data request(s) or charging information that were previously stored by CTF via Nchf interface?

-	When the charging session is not released, how to send the charging data request(s) via Nchf interface once the connection is re-established, e.g., how to store and resend the Charging Data Request(s) with quota management?

The inter-CHF failure scenarios

In the LBO roaming charging via N40+N107 in Figure 4.2.6a in TS 32.255.

-	In case of CTF failure detected by V-CHF, how to handle the charging session between V-CHF and H-CHF?

-	In case of H-CHF failure detected by V-CHF, how to handle the charging session between CTF and V-CHF?

-	The unaligned information elements between CHFs, e.g., Expiry of Unit Count Inactivity Timer, may lead to failure, e.g., one charging session is released while the other is still kept.

In summary, it is proposed for SA5 to study how to enhance reliability from the charging perspective.

4	Objective

The objective of the study item is to investigate the following charging reliability enhancement aspects:

WT-1: Identify the charging mechanism reliability scenarios and requirements, including but not limited to, e.g.,

WT-1.1	The CTF detected failure scenarios.

WT-1.2	The inter-CHF failure scenarios.

WT-2: Study the potential solutions for the charging reliability scenarios.

TU estimates and dependencies

Work Task ID	TU Estimate (Study)	TU Estimate (Normative)	RAN Dependency (Yes/No/Maybe)	SA Dependency (Yes/No/Maybe)	Non-3GPP Dependency
WT-1	1	1	No	Maybe	No
WT-2	2	2	No	Yes	No

Total TU estimates for the study phase: 3

Total TU estimates for the normative phase: 3

Total TU estimates: 6

5	Expected Output and Time scale

New specifications {One line per specification. Create/delete lines as needed}
Type	TS/TR number	Title	For info at TSG#	For approval at TSG#	Rapporteur
Internal TR	TR 32.xxx	Study on charging reliability enhancement	TSG SA #105 (Mar, 2026)	TSG SA #106 (June, 2026)

Impacted existing TS/TR {One line per specification. Create/delete lines as needed}
TS/TR No.	Description of change	Target completion plenary#	Remarks

6	Work item Rapporteur(s)

7	Work item leadership

SA5

8	Aspects that involve other WGs

9	Supporting Individual Members

Supporting IM name
HiSilicon
Huawei