1. A method performed by a Policy and Charging Rules Node (PCRN) for responding to a service request based at least in part on a status of a subscriber network, the method comprising: receiving at the PCRN at least one event message related to a transfer facilitated by the subscriber network; storing data regarding the at least one event message in an Event Storage; receiving at the PCRN a service request for resources controlled by the PCRN; determining the status of the subscriber network; determining from the status of the subscriber network whether the service request should be fulfilled as requested; and if the service request should be fulfilled as requested, generating at least one new policy and charging control (PCC) rule to fulfill the service request, wherein the step of determining the status of the subscriber network further comprises: identifying at least one statistical trend among a subset of the data in the Event Storage; and determining from the at least one statistical trend whether an element of the subscriber network is congested.