Development Of Operational Telecommunication Video-on-Demand System Based On P2P

With the rapid development of Internet technology and the increase of the Chinese Internetusers’s number, Internet Video-on-Demand (VOD) service has become one of the major servicesof the Internet. The traditional video on demand system is based on client/srvent architecture,although its controllability and manageability is higher, the server’s performance can often be thebottalneck of the VOD system’s performance especially when a large number of users arewatching online. When P2P technology is introduced into the video on demand system, VODsystem can take full advantage of the idle resources of other peers (CPU, network bandwidth andstorage resources, etc.), and thus effectively reduce the server’s load and improve the scalabilityand stability of the VOD system. There have been some VOD systems which are based on P2Ptechnology on the internet, but the problems of video’s copyright, P2P users’ management andP2P security are commonly founded in these VOD systems.In order to solve the above problems, this paper proposes a overall solution which is basedon PMTN framework for VOD system. Besides, a VOD system model based on PMTNframework is given, the key problems of this system have been researched and solved, and theVOD system prototype is implemented.This paper has the following contributions:(1) A overall solution which is based on PMTN framework for VOD system has beenproposed. In this framework, a VOD system is divided into business operation layer, P2Pmanagement layer, user media layer and support layer. The P2P technology is mainly used inP2P management layer and user media layer. The business operation layer is independent formthe P2P network, the business changes of the upper layer will not affect the data schedulingstrategy of the P2P network.(2) Kademlia routing algorithm has been improved. In the new algorithm, the logical distance will be in keeping with the physical distance, so the chosen downloading peers will beneighboring peers.(3) In the super peer, static prefix caching combined with dynamic suffix caching strategy isused, in the normal peer, memory caching combined with disk caching strategy is used, and soforth, the startup latency of the client has been reduced and the hit rate of resources has beenimproved.(4) Taking into account the heterogeneity of P2P network, all the peers are classified by theweighted speed method. While downloading data give priority to faster nodes, the real-timeperformance and the playing fluency of the VOD system are eunsured.(5)Taking into account the selfish of peers in P2P network, a solution based on he Hybrid warmodel is proposed.(6) The VOD system prototype is implemented and tested.In the end, the conclusion is made and the future research is put forward.