6.2 Data description for IMS online charging

32.2603GPPCharging managementIP Multimedia Subsystem (IMS) chargingRelease 17Telecommunication managementTS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

6.2.1 Ro message contents

6.2.1.0 Introduction

The IMS nodes generate Debit / Reserve Units message information that can be transferred from the CTF to the OCF. For this purpose, IMS online charging utilises the Debit Units / Reserve Units procedure that is specified in the 3GPP Debit / Reserve Units operation in TS 32.299 [50].

The Debit / Reserve Units procedure employs the Debit / Reserve Units Request and Debit / Reserve Units Response messages. Table 6.2.1.0 describes the use of these messages in IMS online charging.

Table 6.2.1.0: Online charging messages reference table

Message	Source	Destination
Debit / Reserve Units Request	MRFC, AS, IMS-GWF	OCS
Debit / Reserve Units Response	OCS	MRFC, AS, IMS-GWF

6.2.1.1 Debit / Reserve Units Request message

Table 6.2.1.1.1 illustrates the basic structure of a Debit / Reserve Units Request message from the CTF in MRFC and AS and the IMS-GWF as used for IMS online charging.

Table 6.2.1.1.1: Debit / Reserve Units Request message contents

Information Element	Category	Description
Session Identifier	M	Described in TS 32.299 [50]
Originator Host	M	Described in TS 32.299 [50]
Originator Domain	M	Described in TS 32.299 [50]
Destination Domain	M	Described in TS 32.299 [50]
Operation Identifier	M	Described in TS 32.299 [50]
Operation Token	M	Described in TS 32.299 [50]
Operation Type	M	Described in TS 32.299 [50]
Operation Number	M	Described in TS 32.299 [50]
Destination Host	O_C	Described in TS 32.299 [50]
User Name	O_C	The field contains the Private User Identity defined in TS 23.003 [104] .
Origination State	O_C	Described in TS 32.299 [50]
Origination Timestamp	O_C	Described in TS 32.299 [50]
Subscriber Identifier	O_M	This field contains the identification of the mobile subscriber (i.e. MSISDN or SIP-URI) that uses the requested service.
Termination Cause	O_C	Described in TS 32.299 [50]
Requested Action	O_C	Described in TS 32.299 [50]
Multiple Operation	O_M	Described in TS 32.299 [50]
Multiple Unit Operation	O_C	Described in TS 32.299 [50]
Subscriber Equipment Number	O_C	Described in TS 32.299 [50]
Proxy Information	O_C	Described in TS 32.299 [50]
Route Information	O_C	Described in TS 32.299 [50]
Service Information	O_M	This field holts additional 3GPP service specific parameter: – IMS Information, – PS Information

6.2.1.2 Debit / Reserve Units Response message

Table 6.2.1.2.1 illustrates the basic structure of a Debit / Reserve Units Response message as used for IMS charging. This message is always used by the OCS as specified below, independent of the receiving IMS node and the operation type that is being replied to.

Table 6.2.1.2.1: Debit / Reserve Units Response message contents for MRFC, AS and IMS-GWF

Information Element	Category	Description
Session Identifier	M	Described in TS 32.299 [50]
Operation Result	M	Described in TS 32.299 [50]
Originator Host	M	Described in TS 32.299 [50]
Originator Domain	M	Described in TS 32.299 [50]
Operation Identifier	M	Described in TS 32.299 [50]
Operation Type	M	Described in TS 32.299 [50]
Operation Number	M	Described in TS 32.299 [50]
Operation Failover	O_C	Described in TS 32.299 [50]
Multiple Unit Operation	O_C	Described in TS 32.299 [50]
Announcement Information	O_C	Described in TS 32.281 [41]
Operation Failure Action	O_C	Described in TS 32.299 [50]. This field defines the operation if a failure has occurred at the OCS for SCUR and ECUR.
Operation Event Failure Action	O_C	Described in TS 32.299 [50]. This field defines the operation if a failure has occurred at the OCS for IEC.
Redirection Host	O_C	Described in TS 32.299 [50]
Redirection Host Usage	O_C	Described in TS 32.299 [50]
Redirection Cache Time	O_C	Described in TS 32.299 [50]
Proxy Information	O_C	Described in TS 32.299 [50]
Route Information	O_C	Described in TS 32.299 [50]
Failed parameter	O_C	Described in TS 32.299 [50]
Service Information	O_C	This field holts additional 3GPP service specific parameter: – IMS Information, – PS Information