Real-time transport of MPEG video with a statistically guaranteed loss ratio in ATM networks

Unlike deterministic real-time communication in which excessive resources m ay be required for "absolute" performance guarantees, statistical real-time communication seeks to achieve both probabilistic performance guarantees a nd efficient resource sharing. This paper presents a framework for statisti cal real-time communication in ATM networks. providing delay-guaranteed tra nsport of MPEG-coded video traffic with a statistically-guaranteed cell-los s ratio. Delay-guaranteed communication is achieved with a modified version of Traffic-Controlled Rate-Monotonic Priority Scheduling (TCRM). A set of statistical real-time channels that share similar traffic characteristics a re multiplexed into a common macrochannel. Those statistical real-time chan nels which are multiplexed together share the resources of a macrochannel, and individual statistical real-time channels are given timeliness and prob abilistic cell-loss guarantees. A macrochannel is serviced by the modified TCRM which improves link utilization and makes channel management simpler. Based on the analysis of an M/D/1/N queueing system, we propose a procedure for determining the transmission capacity of a macrochannel necessary to s tatistically guarantee a cell-loss ratio bound. Our extensive trace-driven simulation has shown the superiority of the proposed framework to the other approaches. The overall cell-loss ratios for multihop statistical real-tim e channels are shown to be smaller than the predetermined bounds, thus veri fying our analytical results.