Computation of Effective Bandwidth of Aggregated VBR MPEG Video Traffic in ATM Networks Using the Modified Equivalent Capacity

摘要

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 traffics are splitted into I,B,and P frame traffics according to frame type and respective I,B,and P frame traffics are aggregated,where transform expand sample (TES) processes are employed for modeling of MPEG traffics.Second we compute statistical characteristics of the aggregated I frame traffic,aggregated B frame traffic,and aggregated P frame traffic using those of individual I,B,and P frame traffics,where statistical characteristics represent the mean,second and third central moments,and lag 1 autocorrelation of the bit rate of the traffic.Next,the effective bandwidth of 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 traffic and aggregated 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 well estimates the total effective bandwidth of the aggregated VBR MPEG traffic.