Experiments involving the transmission of layered video over a local ATM network

grantor: University of TorontoIn this thesis we investigate the feasibility of transmitting layered video over a local ATM network. Two layered video schemes were looked at: subband coded layered video and MPEG-2 SNR scalable layered video. In both cases the video was transmitted as a constant bit rate (CBR) base layer and an unspecified bit rate (UBR) enhancement layer, we then introduced background traffic (both CBR and UBR) in order to determine their effect on the layered video in terms of delay, jitter and loss. The results obtained for the subband coded video were quite promising, with competing cross traffic in the network having very little effect on base layer jitter or loss. We also found that specifying the cell delay variation tolerance (CDVT) was a factor in preventing base layer loss. Losses in the enhancement layer occurred only when total utilization exceeded 100%, also maintaining synchronization between the two layers did not prove to be problematic even at very high network utilization. Similar results were obtained for the MPEG-2 scalable video, however due to the much higher bit rates in this case, we found maintaining synchronization between the two streams to be more difficult.M.A.Sc