You can use the Policy Enforcement Manager to provision prepaid charging per subscriber or application that communicates with the quota protocol endpoint (QPE), such as online charging system (OCS), over the 3GPP Gy interface. The Gy endpoint allows online credit control for service data flow-based charging. This type of policing is called quota management; this feature ensures that subscribers do not consume resources that are not authorized.
The Gy interface in 3GPP architecture facilitates communication between the online charging system (OCS) and the PCEF. In turn, this communication supports the advanced credit authorization and quota-specific reporting. Policy Enforcement Manager provides online credit control, through user configuration, for service data flow-based charging. The BIG-IP system logically links between Gx and Gy.
The subscriber traffic contains allocated quota that is based on applications, category, or a group of them and is measured in terms of volume, time, and events. You can create a rating group, which is the same as a quota bucket. A rating group is identified by a service-identifier AVP that gathers a set of services, which has the same costs and rating type. Once you create a rating group, you can assign it to multiple rules inside the policy. For all the traffic matching the rule, quota is consumed from this bucket to make sure there is no over-subscription of resources. For example, you can have a rating group assigned to managing video traffic of 500 MB. This rating group needs to be assigned to a rule that matches the video traffic, to ensure that there is no over-subscription of subscriber traffic.
|Terminate||The system stops traffic when quota is breached.|
|Allow||The system allows traffic to go through even when the quota is breached.|
|Redirect||The system redirects traffic to the forwarding endpoint, when quota is breached.|