7.2 DRA Definition

29.2133GPPPolicy and charging control signalling flows and Quality of Service (QoS) parameter mappingRelease 17TS

The DRA (Diameter Routing Agent) is a functional element that ensures that all Diameter sessions established over the Gx, S9, Gxx, Rx interfaces and for unsolicited application reporting, the Sd interface for a certain IP-CAN session reach the same PCRF when multiple and separately addressable PCRFs have been deployed in a Diameter realm. The DRA also ensures that the NRR commands over Np interface reach the same PCRF for a certain IP-CAN session. The DRA is not required in a network that deploys a single PCRF per Diameter realm.