Broadcasting Protocols

M.S. Bhatia (India)


Video on Demand, Staggered, Pagoda, Harmonic, Pyramid, Skyscraper.


Video-on-demand (VOD) has become a topic of great interest and value recently with telecommunications, computer and cable companies. In this paper I present the general overview and comparisons of the different broadcasting methods used in Video on Demand. Broadcasting is one of several techniques that aim at reducing the bandwidth requirements. It only applies to videos that are likely to be simultaneously watched by many viewers. Rather than responding to individual requests, broadcasting uses a proactive approach and executes frequent rebroadcasts of the "Hot videos". The bandwidth savings can be considerable since the top ten or twenty most popular videos are likely to account for over forty percent of the total demand. If we attempt to rank the broadcasting protocols according to the bandwidth they require guaranteeing a given average delay. We quickly notice that protocols that allocate a multitude of very low bandwidth streams to each video require much less bandwidth than protocols using a few high-bandwidth streams shared by all videos. The broadcasting design adopts the broadcast delivery paradigm to serve many concurrent customers.

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