Gx Interface Support
Rel. 7 Gx Interface ▀
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
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If PCC is enabled, the PCEF selects a PCC rule for each received downlink IP packet within an IP CAN session by
evaluating the packet against downlink SDF filters of PCRF-provided or predefined active PCC rules of all IP CAN
bearers of the IP CAN session in the order of the precedence of the PCC rules.
Important:
When a PCRF-provided PCC rule and a predefined PCC rule have the same precedence, the
downlink SDF filters of the PCRF-provided PCC rule are applied first.
When a packet matches a SDF filter, the packet matching process for that packet is completed, and the PCC rule for that
filter is applied. The Downlink IP Packet is transported within the IP CAN bearer where the selected PCC rule is
mapped. Downlink IP packets that do not match any PCC rule of the IP CAN session are discarded.
The following procedures are also supported:
Indication of IP-CAN Bearer Termination Implications
Indication of IP-CAN Session Termination: When the IP-CAN session is being terminated (for example, for
GPRS when the last PDP Context within the IP-CAN session is being terminated) the PCEF contacts the
PCRF.
Request of IP-CAN Bearer Termination: If the termination of the last IP CAN bearer within an IP CAN session
is requested, the PCRF and PCEF apply the “Request of IP-CAN Session Termination” procedure.
Request of IP-CAN Session Termination: If the PCRF decides to terminate an IP CAN session due to an internal
trigger or trigger from the SPR, the PCRF informs the PCEF. The PCEF acknowledges to the PCRF and
instantly removes/deactivates all the PCC rules that have been previously installed or activated on that IP-CAN
session.
The PCEF applies IP CAN specific procedures to terminate the IP CAN session. For GPRS, the GGSN send a PDP
context deactivation request with the teardown indicator set to indicate that the termination of the entire IP-CAN session
is requested. Furthermore, the PCEF applies the “Indication of IP CAN Session Termination” procedure.
In 12.0 and later releases, volume or rule information obtained from PCRF is discarded if the subscriber is going down.
Volume Reporting Over Gx
This section describes the 3GPP Rel. 9 Volume Reporting over Gx feature, which is supported by all products
supporting Rel. 7 Gx interface.
License Requirements
The Volume Reporting over Gx is a licensed Cisco feature. A separate feature license may be required. Contact your
Cisco account representative for detailed information on specific licensing requirements. For information on installing
and verifying licenses, refer to the
Managing License Keys
section of the
Software Management Operations
chapter in
the
System Administration Guide
.
Important:
In 12.0 and later releases, no separate license is required for Charging over Gx / Volume Reporting
over Gx feature. This feature can be enabled as part of "Policy Interface" license.
Supported Standards
The Volume Reporting over Gx feature is based on the following standard:
3GPP TS 29.212 V9.5.0 (2010-06): 3rd Generation Partnership Project; Technical Specification Group Core Network
and Terminals; Policy and Charging Control over Gx reference point (Release 9).