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Title: Fuzzy based rate control for real-time MPEG video
Authors: Tsang, Danny H. K.
Bensaou, Brahim
Lam, Shirley Tung Ching
Keywords: Traffic shaping
Fuzzy control
Asynchronous transfer mode
MPEG real time video
Issue Date: Nov-1998
Citation: IEEE transactions on fuzzy systems, vol. 6, no. 4, Nov. 1998, p. 504-516
Abstract: In this paper, we propose a fuzzy logic based control scheme for real time MPEG video to avoid long delay or excessive loss at the user-network interface (UNI) in an ATM network. The system consists of a shaper whose role is to smooth the MPEG output traffic to reduce the burstiness of the video stream. The input and output rates of the shaper buffer are controlled by two fuzzy logic based controllers. To avoid a long delay at the shaper, the first controller aims to tune the output rate of the shaper based on the number of available transmission credits at the UNI and the occupancy of the shaper's buffer in the video frame time-scale. Based on the average occupancy of the shaper's buffer and its variance, the second controller tunes the input rate to the shaper over a much larger time-scale by applying a closed loop MPEG encoding scheme. With this approach, the traffic enters the network at an almost constant bit rate (with a very small variation) allowing simple network management functions such as admission control and bandwidth allocation, while guaranteeing a relatively constant video quality since the encoding rate is changed only in critical periods when the shaper buffer "threatens" to overflow. The performance of the proposed scheme is evaluated through numerical tests on real video sequences.
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