Computation of effective bandwidth of aggregated VBR MPEG video traffic in ATM networks using the modified equivalent capacity

A method for computing the effective bandwidth of aggregated variable bit rate (VBR) Moving Picture Experts Group (MPEG) video traffic is proposed. First, individual MPEG traffic are split into I, B, and P frame traffic according to the frame type and the respective I, B, and P frame traffic are aggregated, where transform expand sample (TES) processes are employed for modeling the MPEG traffic. Second, we compute the statistical characteristics of the aggregated I frame traffic, aggregated B frame traffic, and aggregated P frame traffic using the individual I, B, and P frame traffic, where the statistical characteristics represent the mean, second and third central moments, and the lag 1 autocorrelation of the bit rate of the traffic. Next, the effective bandwidth of the aggregated I frame traffic is computed by the Gaussian bound. We calculate the statistical characteristics of the combined B and P frame traffic using those of the aggregated B frame and P frame traffic, and estimate the effective bandwidth of the combined B and P frame traffic using the modified equivalent capacity. Finally, we compute the total effective bandwidth of the aggregated VBR MPEG traffic by adding the Gaussian bound of the aggregated I frame traffic and the modified equivalent capacity of the combined B and P frame traffic. Computer simulation shows that the proposed method provides a good estimate of the total effective bandwidth of the aggregated VBR MPEG traffic.