出版社：University of Malaya * Faculty of Computer Science and Information Technology
摘要：This paper outlines a proxysubscribersubscriber approach, named cohortsurrogateassociate (CSA) architecture, to address three main concerns inherent in a videoondemand (VoD) service: delivery performance, video traffic, and playout delay. The model coerced coordination among subscribers, whereby every subscriber has a list of video data units stored in their settopbox (STB) as well those that are stored in other subscriber’s STB within the same network edge. This way, a VoD request can be systematically offloaded to other subscriber(s) cached with the same video data units, within the same network edge, instead of requesting the video data units from a proxy or remote server. The CSA architecture may be conceptualized as a composition of three ‘layer’, the associate being the lowest layer, followed by the surrogate and the cohort. The cohort is responsible for grouping associate(s) with same viewing interest together i.e. watching the same quasigenre video. The surrogate is responsible for coordinating the delivery of video data units among associate(s) at the same network edge, when needed. All associate(s) in the same network edge can be the contributors of the video data unit. This paper formally defines the role of cohort, surrogate, and associate under different scenarios for VoD services.
关键词：videoondemand; video delivery; content delivery network; settop box; timeweighted video popularity; user interest; load balancing
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