A Traffic Descriptor-Based Flow Control Scheme for Efficient Video Transmission over ATM
Video transmission requires high transmission bandwidth and a sophisticated flow control scheme in order to guarantee the quality of service. In this paper, we design a traffic descriptor model for variable-hit-rate sources in ATM networks, and develop a rate-based flow control scheme to reduce queueing delay and possible buffer overflow. VBR traffic flow can be modeled as a two-state Markov Chain via an overload state and a underload state. Each state is characterized by its load index and duration. Based on the utilization factor of the queueing system, the transmission rate is determined from the traffic descriptor parameters. Since the traffic model gives a macroscopic view for traffic variations over time, our scheme is feasible for implementation in real-time flow control systems.
KeywordsService Rate Utilization Factor Traffic Stream Buffer Overflow Burst Period
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