A P2P Broadcasting Scheme for Video on Demand Services

In this paper, we propose a new broadcasting scheme, called P2P broadcasting, for eliminating the service latency time of the existing broadcasting schemes. Our broadcasting scheme is based on the simplest staggered broadcasting protocol and then we use peer to peer caching technique, in which a number of clients that share a segment of a stream delivered from the same channel forms a group. Each client in a group plays a role of a prefix caching server to deliver the first segment of the stream for other clients. During the fixed time interval of one segment, each client in a group caches a portion of the first segment received from another channel that starts to transmit the first segment of the stream, and then they support the first segment to new clients during the time interval of the segment. As a result of the P2P caching, our broadcasting scheme can eliminate the service latency of the broadcasting scheme along with less storage requirement than the existing broadcasting schemes.