PCC – Policy and Charging Control
The PCC (Policy and Charging Control) architecture has been specified by the 3GPP as a mechanism which enables packets flowing through an IP-CAN to be associated with a particular charging key for both online and offline billing. In addition, PCC also provides policy control, in which a PCRF (Policy Control and Charging Rules Function) interacts with a PCEF (Policy Charging and Control Enforcement Function) in order to provide instruction on the control of the IP-CAN. PCC is a technique which can be used within the IMS to provide policy and charging control between IMS entities (namely the P-CSCF ) and the IP-CAN.
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