What is Gx?

Gx is a reference point in 3GPP (3rd Generation Partnership Project) architecture, specifically within the Policy and Charging Control (PCC) framework. It represents the interface between the Policy and Charging Rules Function (PCRF) and the Bearer Binding and Event Reporting Function (BBERF), or, in some architectures, the Traffic Detection Function (TDF). Its primary purpose is to allow the PCRF to dynamically control the data traffic of a subscriber's session. Through the Gx interface, the PCRF can provide the BBERF (typically located in a gateway device) or TDF with policy rules specifying Quality of Service (QoS) parameters, charging rates, and traffic handling instructions. This enables dynamic and personalized control over the user's network experience. For example, it allows a service provider to prioritize video streaming traffic or apply different charging rules based on the application being used.