Gx Interface Support
▀ Rel. 8 Gx Interface
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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Predefined PCC Rule: Rules preconfigured in the PCEF by the operators. Predefined PCC rules can be activated
or deactivated by the PCRF at any time. Predefined PCC rules within the PCEF may be grouped allowing the
PCRF to dynamically activate a set of PCC rules over the Gx reference point.
Important:
A third kind of rule, the static PCC rule can be preconfigured in the chassis by the operators. Static
PCC rules are not explicitly known in the PCRF, and are not under control of the PCRF. Static PCC rules are bound to
general purpose bearer with no Gx control.
A PCC rule consists of:
Rule Name: The rule name is used to reference a PCC rule in the communication between the PCEF and PCRF.
Service Identifier: The service identifier is used to identify the service or the service component the SDF relates
to.
Service Data Flow Filter(s): The service flow filter(s) is used to select the traffic for which the rule applies.
Precedence: For different PCC rules with overlapping SDF filter, the precedence of the rule determines which of
these rules is applicable. When a dynamic PCC rule and a predefined PCC rule have the same priority, the
dynamic PCC rule takes precedence.
Gate Status: The gate status indicates whether the SDF, detected by the SDF filter(s), may pass (gate is open) or
will be discarded (gate is closed) in uplink and/or in downlink direction.
QoS Parameters: The QoS information includes the QoS class identifier (authorized QoS class for the SDF), and
authorized bitrates for uplink and downlink.
Charging Key (rating group)
Other charging parameters: The charging parameters define whether online charging interfaces are used, on what
level the PCEF will report the usage related to the rule, etc.
Important:
Configuring the Metering Method and Reporting Level for dynamic PCC rules is not supported.
PCC rules also include Application Function (AF) record information for enabling charging correlation between the
application and bearer layer if the AF has provided this information via the Rx interface. For IMS, this includes the IMS
Charging Identifier (ICID) and flow identifiers.
PCC Procedures over Gx Reference Point
Request for PCC Rules
The PCEF, via the Gx reference point, requests for PCC rules in the following instances:
At IP-CAN session establishment
At IP-CAN session modification
PCC rules can also be requested as a consequence of a failure in the PCC rule installation/activation or enforcement
without requiring an event trigger.
Provisioning of PCC Rules
The PCRF indicates, via the Rel. 8 Gx reference point, the PCC rules to be applied at the PCEF. This may be using one
of the following procedures:
