Buffer Storage for Video Delivery

Communication technologies have provided bandwidth in Gigabytes and researchers are working to further enhance it. The bandwidth is still a bottleneck in many of the multimedia applications such as video-on-demand, movie-on-demand, etc. Therefore, apart from enhancement in the bandwidth it is also equally important to develop suitable techniques so that the bandwidth can be utilized efficiently. The bandwidth may be allocated through channelization. There are two modes of channelization, namely, constant and variable bandwidth channelization. In constant bandwidth channelization the server bandwidth is equally divided into logical channels, whereas in variable bandwidth channelization the server bandwidth is unevenly divided into logical channels. In variable bandwidth channelization the buffer requirement is less than that of constant bandwidth channelization. Therefore, based on variable bandwidth channelization a mathematical model is proposed to estimate the buffer requirement for a given bandwidth, taking into consideration jitter delay. The jitter delay, a non-deterministic quantity, is assumed as a random variable with uniform distribution. The buffer storage is calculated by considering a physical channel, dividing into two, three, and five logical channels. Further, the bandwidth allocation to logical channels is estimated.