Cisco Cisco Packet Data Gateway (PDG) Guía Para Resolver Problemas
Gx Interface Support
Rel. 7 Gx Interface ▀
Cisco ASR 5000 Series Enhanced Feature Configuration Guide ▄
OL-22983-01
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.
without requiring an event trigger.
Provisioning of PCC rules
The PCRF indicates, via the Rel. 7 Gx reference point, the PCC rules to be applied at the PCEF. This may be using one
of the following procedures:
of the following procedures:
PULL (provisioning solicited by the PCEF): In response to a request for PCC rules being made by the PCEF, the
PCRF provisions PCC rules in the CC-Answer.
PUSH (unsolicited provisioning): The PCRF may decide to provision PCC rules without obtaining a request
from the PCEF. For example, in response to information provided to the PCRF via the Rx reference point, or in
response to an internal trigger within the PCRF. To provision PCC rules without a request from the PCEF, the
PCRF includes these PCC rules in an RA-Request message. No CCR/CCA messages are triggered by this RA-
Request.
response to an internal trigger within the PCRF. To provision PCC rules without a request from the PCEF, the
PCRF includes these PCC rules in an RA-Request message. No CCR/CCA messages are triggered by this RA-
Request.
For each request from the PCEF or upon unsolicited provision the PCRF provisions zero or more PCC rules. The PCRF
may perform an operation on a single PCC rule by one of the following means:
may perform an operation on a single PCC rule by one of the following means:
To activate or deactivate a PCC rule that is predefined at the PCEF, the PCRF provisions a reference to this PCC
rule within a Charging-Rule-Name AVP and indicates the required action by choosing either the Charging-
Rule-Install AVP or the Charging-Rule-Remove AVP.
Rule-Install AVP or the Charging-Rule-Remove AVP.
To install or modify a PCRF-provisioned PCC rule, the PCRF provisions a corresponding Charging-Rule-
Definition AVP within a Charging-Rule-Install AVP.
To remove a PCC rule which has previously been provisioned by the PCRF, the PCRF provisions the name of
this rule as value of a Charging-Rule-Name AVP within a Charging-Rule-Remove AVP.
If the PCRF performs the bearer binding, the PCRF may move previously installed or activated PCC rules from
one IP CAN bearer to another IP CAN bearer.
Selecting a PCC Rule for Uplink IP Packets
If PCC is enabled, the PCEF selects the applicable PCC rule for each received uplink IP packet within an IP CAN
bearer by evaluating the packet against uplink SDF filters of PCRF-provided or predefined active PCC rules of this IP
CAN bearer in the order of the precedence of the PCC rules.
bearer by evaluating the packet against uplink SDF filters of PCRF-provided or predefined active PCC rules of this IP
CAN bearer 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 uplink
SDF filters of the PCRF-provided PCC rule is applied first.