Impact of shortrange and longrange dependence on variable bit rate video traffic performa.pdf

Impact of ShortRange and LongRange Dep endence on Variable Bit Rate Video Trac Performance Lakshmi Yellanki Department of Computer Science University of Saskatchewan Campus Drive Saskato on SK SN A Canada email laycsusaskca Sup ervisor Dr Carey Williamson Abstract Traditionally Markovian mo dels have b een used to statistically represent variable bit rate VBR video trac These mo dels exhibit shortrange dependence SRD However recent measurements show that VBR video trac p ossesses selfsimilar characteristics meaning that longrange dependence LRD in the trac stream lasts much longer than traditional mo dels can capture This pap er investigates the relative p erformance impacts of SRD and LRD in VBR video trac by conducting a simulation study using four sets of VBR video data a real video trace with b oth SRD and LRD a synthetic video trace with only LRD a synthetic video trace with only SRD and a synthetic video trace without SRD and LRD The p erformance study suggests that video trac mo dels must capture b oth SRD and LRD Intro duction Variable bit rate VBR video is exp ected to b ecome one of the ma jor applications used on highsp eed networks such as ATMbased BISDN Huang et al Heyman and Lakshman Moreover the high bandwidth and burstiness of VBR video trac can ma