A Novel Optimized Design of Popularity Cushion Staggered Broadcast over Video on Demand System

摘要

Video on Demand (VOD) system is an electronic video rental system where the clients have the ability to request and view the video at any time,which makes the VOD to become an important technology with many applications. Numerous periodic VOD broadcasting protocols have been proposed to support a large number of receivers. Broadcasting is an efficient transmission scheme which provides on-demand service for very popular movies. This paper proposed a new broadcasting protocol called Popularity Cushion Staggered Broadcasting (PCSB) protocol. This proposed protocol improved the Periodic Broadcasting (PB) protocol for the latest mobile VOD system (MobiVoD). It also reduces the maximum waiting time of the mobile node, by partitioning the 1stsegment of the whole video and storing it in the Local Media Forwarder (LMF) exactly as it is in the Pool of RAM (PoR) and then transmitting them when the mobile nodes missed the already broadcasted 1stsegment.The results show that the PCSB is more efficient and better than all other types of broadcasting and caching techniques in the MobiVoD system. Furthermore, these results exhibited that system performance is stable under high dynamics of the system andthe viewer’s waiting time are less than3.61374 s in most scenarios whencompared with that in the previous system.