Definition A policy and charging control (PCC) rule, which is called rule on the Unified Policy and Charging Controller (UPCC), is a set of parameters for controlling service policies and charging policies. A PCC rule name must be unique in an IP connectivity access network (IP-CAN) session. A PCC rule includes a rule name, quality of service (QoS) parameters, charging parameters, charging identifier (RG/SID), precedence, and service flow filter. Purpose - Detect a packet belonging to a service flow.
- The service flow filters in the PCC rule are used for the selection of downlink IP-CAN bearers.
- The service flow filters in the PCC rule are used for the enforcement that uplink IP flows are transported in the correct IP-CAN bearer.
- Identify the service that the service flow belongs to.
- Provide applicable charging parameters for a service flow.
- Provide policy control for a service flow.
Classification -
Dynamic PCC rule A dynamic PCC rule is provisioned by the PCRF to the PCEF over the Gx interface. PCC rules may be either predefined or dynamically generated in the PCRF. For example, when the PCRF receives a request from the Rx interface, it generates a dynamic rule and sends the rule over the Gx interface. -
Predefined PCC rule A predefined PCC rule is preconfigured on the PCEF. The PCRF can use the predefined rule name to reference the predefined rule configured on the PCEF. Predefined PCC rules configured in the PCEF may be grouped, which allows the PCRF to dynamically activate a group of PCC rules over the Gx interface. Contents -
Rule name The Charging-Rule-Name AVP is used to reference a PCC rule in the communication between the PCEF and the PCRF. The PCC rule can be a dynamic or predefined rule. -
Service ID The Service-Identifier AVP is used to identify a service or the service component that is related to the service flow. -
Service flow filter The service flow filter is used to select the traffic for which a PCC rule applies. When a packet matches a service flow filter, the PCC rule matching the service flow filter is applied. -
Precedence The Precedence AVP determines which PCC rule is applicable when multiple PCC rules contain overlapping service flow filters. When a dynamic PCC rule and a predefined PCC rule have the same precedence, the dynamic PCC rule takes precedence. -
Gate status The gate status indicates whether the service flow, detected by the service flow filter, is allowed (gate is open) or discarded (gate is closed) in uplink or downlink direction. -
QoS parameters The QoS-Information AVP includes the QoS class identifier (authorized QoS class for the service flow), allocation and retention priority (ARP), and authorized uplink and downlink bitrates. -
Charging identifier The charging identifier includes Rating-Group and Service-Identifier. -
Charging parameters The charging parameters define the charging mode (online or offline charging) to be used, metered object (time or volume) in offline charging, and level for the PCEF to report the usage related to the PCC rule. -
Usage monitoring key The Monitoring-Key or X-HW-Monitoring-Key AVP identifies a usage monitoring instance. Operations - The following operations are available for dynamic PCC rules:
- Installation: provisions a PCC rule that has not been installed.
- Modification: modifies a PCC rule that has been installed.
- Removal: removes a PCC rule that has been installed.
- The following operations are available for predefined PCC rules:
- Activation: activates a PCC rule.
- Deactivation: deactivates a PCC rule.
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