Bandwidth renegotiation scheme for VBR video services

The authors show how the existence of long term variability in variable bit rate (VBR) video traffic imposes the need for bandwidth renegotiation. In particular. two simple scenarios with a fixed renegotiation interval are co nsidered. Using a real MPEG trace the renegotiation scheme is evaluated to prove its benefits in tens of bandwidth gain and quality of sen;ice. The pr oblem of renegotiation demonstrates the need for modelling long term variab ility in VER traffic.