6.4a TDF session related policy information

23.2033GPPPolicy and charging control architectureRelease 17TS

The purpose of the TDF session related information is to provide information that is applicable to the whole TDF session. The PCRF provides the TDF session related information to the TDF (if applicable) using ADC rule provision procedure.

Table 6.4a lists the TDF session related policy information.

Table 6.4a: TDF session related policy information

Attribute	Description	PCRF permitted to modify the attribute
Charging Characteristics	Defines how to control TDF behaviour regarding online and offline charging.	No
Charging information	Defines the containing OFCS and/or OCS addresses.	No
Default charging method	Defines the default charging method for the TDF session.	No
Event trigger	Defines the event(s) that shall cause a re-request of ADC rules for the TDF session.	Yes
Maximum downlink bit rate	Defines the maximum downlink bit rate per TDF session.	Yes
Maximum uplink bit rate	Defines the maximum uplink bit rate per TDF session.	Yes
ADC Revalidation time limit	Defines the time period within which the TDF shall perform an ADC rules request.	Yes

Upon the initial interaction with the TDF, the PCRF may provide Charging Characteristics to the TDF, if received from the PCEF, defining how to control TDF behaviour regarding online and offline charging.

Upon the initial interaction with the TDF, the PCRF may provide Charging information containing OFCS and/or OCS addresses to the TDF defining the offline and online charging system addresses respectively. These shall override any possible predefined addresses at the TDF. If received by the TDF, it supersedes the Primary OFCS/OCS address and Secondary OFCS/OCS address predefined at the TDF.

Upon the initial interaction with the TDF, the PCRF may provide Default charging method indicating what charging method shall be used in the TDF session for every ADC rule where the charging method identifier is omitted. If received by the TDF, it supersedes the defined Default charging method.

If Charging Characteristics are received by the PCRF from the PCEF, the PCRF may take them into account when providing Charging information and Default charging method to the TDF. In case the TDF receives both Charging Characteristics and Charging information and Default charging method parameters, the Charging Information and Default charging method shall supersede the values received in Charging Characteristics.

Upon every interaction with the TDF, the PCRF may provide Maximum downlink bit rate and/or Maximum uplink bit rate for the TDF session.

NOTE: To avoid down-link packets being discarded in PCEF when TDF performs charging, the PCRF should set the Maximum downlink bit rate to the DL APN-AMBR.

Upon every interaction with the TDF, the PCRF may provide event triggers for the TDF session. Event triggers are used to determine which event causes the TDF to re-request ADC rules. The triggers applicable for the TDF are listed in clause 6.1.4.

The ADC Revalidation time limit defines the time period within which the TDF shall trigger a request for ADC rules for an established TDF session.