VBR로 부호화된 지연 민감 서비스의 다중화를 위한 동적인 전송률 할당 알고리즘

This paper describes a novel multiplexing scheme for delay-sensitive multiple VBR-coded bit streams in live multimedia service offered to high-speed networks. The primary goal of multiplexing in this paper is to keep delay limits of each bit streams and to enhance network resource utilization when they are multiplexed and transmitted over network. For this aim, this paper presents a dynamical control scheme which does not cause violation of any delay constraints inherent to each bit stream. The scheme is based on the assumption that recent behavior of the each bit stream has high correlation with near-term future behavior. Such property is used to make as flat as possible by both temporal averaging on a stream-by-stream and spatial averaging is introduced when multiple VBR-coded bit streams are multiplexed. The effectiveness of the scheme is evaluated by several simulations using an MPEG-coded video trace of Star-wars and it is shown that the proposed scheme can effectively reduce the peak rate and coefficient of variation of the multiplexed transmission rate.