A method performed by a Policy and Charging Rules Node, PCRN, for processing a first request message from a first device to generate at least one Policy and Charging Control, PCC, rule, the method comprising: receiving a first request message containing flow information which is contained within a Packet-Filter-Information AVP included in the first request message; determining the status of a Packet-Filter-Operation associated with the first request message, wherein the first request message includes a Packet-Filter-Operation AVP corresponding to the Packet-Filter-Information AVP; translating the first request message into a service flow; if the Packet-Filter-Operation AVP is set to addition, determining whether a rule storage contains a first PCC rule that matches the service flow into which the first request message has been translated, a service flow including information described by the first request message, said information including requested bandwidth, subscriber identifier, and/or data stream type; if the rule storage contains the first PCC rule, modifying the first PCC rule using the flow information contained in the first request message; if the rule storage does not contain the first PCC rule, determining whether, when the first request message is received, a second request message being a mate of the first request message has been received from a second device, a request message being a mate of another request message if it contains complementary information for use by the PCRN when creating the first PCC rule; if, when the first request message is received, the second request message has been received from the second device, generating the first PCC rule using the flow information contained in the first request message and the second request message; if, when the first request message is received, the second request message has not been received from the second device, starting a timer beginning a period to receive the second request message from the second device, when the second request message does not arrive before the timer expires, generating the first PCC rule using the flow information contained in the first request message without receiving the second request message after the period elapsed; and pushing the first PCC rule to at least one gateway. receiving a first request message containing flow information which is contained within a Packet-Filter-Information AVP included in the first request message; determining the status of a Packet-Filter-Operation associated with the first request message, wherein the first request message includes a Packet-Filter-Operation AVP corresponding to the Packet-Filter-Information AVP; translating the first request message into a service flow; if the Packet-Filter-Operation AVP is set to addition, determining whether a rule storage contains a first PCC rule that matches the service flow into which the first request message has been translated, a service flow including information described by the first request message, said information including requested bandwidth, subscriber identifier, and/or data stream type; if the rule storage contains the first PCC rule, modifying the first PCC rule using the flow information contained in the first request message; if the rule storage does not contain the first PCC rule, determining whether, when the first request message is received, a second request message being a mate of the first request message has been received from a second device, a request message being a mate of another request message if it contains complementary information for use by the PCRN when creating the first PCC rule; if, when the first request message is received, the second request message has been received from the second device, generating the first PCC rule using the flow information contained in the first request message and the second request message; if, when the first request message is received, the second request message has not been received from the second device, starting a timer beginning a period to receive the second request message from the second device, when the second request message does not arrive before the timer expires, generating the first PCC rule using the flow information contained in the first request message without receiving the second request message after the period elapsed; and pushing the first PCC rule to at least one gateway.