The RAR is a Diameter credit control command. In LTE, the message is sent by the PCRF to the PCEF across the Gx interface in order to provision PCC/QoS rules and event triggers using a push procedure. An example would be a network initiated dedicated EPS bearer establishment, whereby the receipt of this message would trigger the appropriate GTPv2-C message to be sent to the PDN-GW and the S-GW.
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