One More Server for Supporting Interactivity in a P2P Video-on-demand System
In a P2P video-on-demand(VoD) system,the asynchronous characteristic of users′ VCR operations makes data sharing among peers more challenging,and raises very high capability requirement of the source video server.In this paper,we consider the problem of how to improve users′ experience of random seeking.We propose adding one more server in a P2P VoD system to support the VCR operations and investigate the capacity dimensioning problem for the new server.We use a simple queueing model to characterize the access of users′ random seeking data requests to the server and formulate a quantitative relationship between longest tolerant waiting time of VCR operation and the required bandwidth of the server.The numerical results show that only fairly small server capacity is needed to satisfy the bandwidth requirement of random seeking in a P2P VoD system with thousands of users.