Performance analysis of rate control with scaling QoS parameters for multimedia transmissions

Advanced networking technologies have enabled the integration of multimedia transmissions, such as video, voice and data, in packet-switched networks. At the network level, it has been shown that stringent quality of service (QoS) guarantees are required for multimedia traffic flows through appropriate rate controls. The authors propose a novel rate control model to regulate the generating rate of each media traffic source by scaling the QoS parameters, including video quantisation parameter, voice packet-dropping rate and delayed data transmission. They also study the mapping function between the rate regulation and the rate scheduling corresponding to the QoS parameters so that not only QoS but rate smoothing can be guaranteed for multimedia transmissions. The race condition caused by single-level feedback control is also mitigated by applying multilevel queueing. The performance of the rate control model is analysed by employing the M/D/1/K queueing model, and the effectiveness is demonstrated by numerical results.