Cisco ASR 5000 Administration Manual page 83

Gx Interface Support
Important:
Charging Control is the process of associating packets belonging to an SDF to a charging key, and applying online
charging as appropriate. FBC handles differentiated charging of the bearer usage based on real-time analysis of the
SDFs. In order to allow for charging control, the information in the PCC rule identifies the SDF and specifies the
parameters for charging control. The PCC rule information may depend on subscription data.
Online charging is supported via the Gy interface. In the case of online charging, it is possible to apply an online
charging action upon PCEF events (for example, re-authorization upon QoS change).
It is possible to indicate to the PCEF that interactions with the charging systems are not required for a PCC rule, that is
to perform neither accounting nor credit control for this SDF, then neither online nor offline charging is performed.
Supported Features:

Provisioning of charging-related information for the IP-CAN Session

Provisioning of charging addresses: Primary or secondary event charging function name (Online Charging Server (OCS)
addresses)
Important:
collection function name (Offline Charging Server (OFCS) addresses) over Gx is not supported.

Provisioning of Default Charging Method
Charging Correlation
In the HA/PDSN Rel. 8 Gx implementation, Charging Correlation is not supported. PCRF provides the flow identifier,
which uniquely identifies an IP flow in an IMS session.
Policy and Charging Control (PCC) Rules
A PCC rule enables the detection of an SDF and provides parameters for policy control and/or charging control. The
purpose of the PCC rule is to:
 Detect a packet belonging to an SDF in case of both uplink and downlink IP flows based on SDF filters in the
PCC rule (packet rule matching).
If no PCC rule matches the packet, the packet is dropped.
 Identify the service that the SDF contributes to.
 Provide applicable charging parameters for an SDF.
 Provide policy control for an SDF.
The PCEF selects a PCC rule for each packet received by evaluating received packets against SDF filters of PCC rules
in the order of precedence of the PCC rules. When a packet matches an SDF filter, the packet matching process for that
packet is completed, and the PCC rule for that filter is applied.
There are two types of PCC rules:
 Dynamic PCC Rules: Rules dynamically provisioned by the PCRF to the PCEF via the Gx interface. These PCC
rules may be either predefined or dynamically generated in the PCRF. Dynamic PCC rules can be activated,
modified, and deactivated at any time.
OL-27210-02
In the HA/PDSN Rel. 8 Gx implementation, offline charging is not supported.
In the HA/PDSN Rel. 8 Gx implementation, provisioning of primary or secondary charging
Cisco ASR 5000 IP Services Gateway Administration Guide ▄
Rel. 8 Gx Interface ▀
83