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▀ Rel. 8 Gx Interface
Rel. 8 Gx Interface
Rel. 8 Gx interface support is available on the Cisco ASR chassis running StarOS 10.0 or StarOS 11.0 and later releases.
This section describes the following topics:
Ref - HAPDSN Rel. 8 Gx Interface Support
P-GW Rel. 8 Gx Interface Support
HA/PDSN Rel. 8 Gx Interface Support
This section provides information on configuring Rel. 8 Gx interface for HA and PDSN to support policy and charging
control for subscribers in CDMA networks.
The IMS service provides application support for transport of voice, video, and data independent of access support.
Roaming IMS subscribers in CDMA networks require apart from other functionality sufficient, uninterrupted,
consistent, and seamless user experience during an application session. It is also important that a subscriber gets charged
only for the resources consumed by the particular IMS application used.
It is recommended that before using the procedures in this section you select the configuration example that best meets
your service model, and configure the required elements for that model as described in this Administration Guide.
This section describes the following topics:
Introduction
Terminology and Definitions
How it Works
Configuring HA/PDSN Rel. 8 Gx Interface Support
Gathering Statistics
Introduction
For IMS deployment in CDMA networks the system uses Rel. 8 Gx interface for policy-based admission control
support and flow-based charging (FBC). The Rel. 8 Gx interface supports enforcing policy control features like gating,
bandwidth limiting, and so on, and also supports FBC. This is accomplished via dynamically provisioned Policy Control
and Charging (PCC) rules. These PCC rules are used to identify Service Data Flows (SDF) and to do charging. Other
parameters associated with the rules are used to enforce policy control.
The PCC architecture allows operators to perform service-based QoS policy and FBC control. In the PCC architecture,
this is accomplished mainly by the Policy and Charging Enforcement Function (PCEF)/HA/PDSN and the Policy and
Charging Rules Function (PCRF). The client functionality lies with the HA/PDSN, therefore in the IMS Authorization
(IMSA) scenario it is also called the Gateway. The PCEF function is provided by the Enhanced Charging Service
(ECS). The Gx interface is implemented as a Diameter connection. The Gx messaging mostly involves
installing/modifying/removing dynamic rules and activating/deactivating predefined rules.
The Gx reference point is located between the Gateway/PCEF and the PCRF. This reference point is used for
provisioning and removal of PCC rules from the PCRF to the Gateway/PCEF, and the transmission of traffic plane
events from the Gateway/PCEF to the PCRF. The Gx reference point can be used for charging control, policy control, or
both by applying AVPs relevant to the application.
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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Gx Interface Support
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