Performance analysis of CDN-P2P networks based on processer-sharing queues

With the development of computer, Internet and multimedia technology, network services based streaming media are widely used. The network services include video-on-demand (VOD), video broadcast, IPTV and a variety of value-added services. Content delivery network (CDN) is used to provide such services by many service provides. In this paper we consider a CDN-P2P networks system in which heterogeneous servers operating under the processor sharing (PS) discipline. In the system, when a stream of users' requests arrive at a media server, it will provide service if it can, or it will inquire directory server to find a suitable media server which can provide this service. This is a redirect process. To find a better redirection strategy, we analyze the performance of a single server using the finite capacity M/M/1/N-PS model first. For this model, two exact expressions are derived for both user's average service time and average waiting time. Then we analyze the performance of the CDN-P2P networks system by adopting different redirection strategies. Finally, some numerical examples are made to check our results.