A multimedia delivery network, comprising network resource allocation means for allocating bandwidth to a network session between a UE (user equipment) device on the network and a delivery server, wherein the allocation means is adapted to reserve a nominal bandwidth for the network session when the session is opened, which permits delivery of data from the delivery server to the UE at a nominal service rate, and wherein the delivery server is adapted to increase the bandwidth of the session, to a higher bandwidth once the session has been opened, so as to permit delivery of data from the delivery server to the UE at a burst delivery rate higher than the nominal rate.