CAJ | 학술논문

近十年来,基于对等网络(Peer-to-Peer,P2P)的视频点播系统(Video-on-Demand,VoD)受到了越来越多的关注.它吸引人的原因在于,与传统的基于服务器/客户机结构的视频点播系统相比,P2P技术具有成本低、扩展性好的优点.但是,由于对等网络内在的不稳定性、异构性,这类系统在实现上面临着诸多挑战.文中对现有的该类系统的体系结构进行模块划分,并对各模块的实现策略进行讨论;特别是对VoD/P2P实现中的3个主要方面,即数据传输、数据存储、激励机制进行了综述.
근십년래,기우대등망락(Peer-to-Peer,P2P)적시빈점파계통(Video-on-Demand,VoD)수도료월래월다적관주.타흡인인적원인재우,여전통적기우복무기/객호궤결구적시빈점파계통상비,P2P기술구유성본저、확전성호적우점.단시,유우대등망락내재적불은정성、이구성,저류계통재실현상면림착제다도전.문중대현유적해류계통적체계결구진행모괴화분,병대각모괴적실현책략진행토론;특별시대VoD/P2P실현중적3개주요방면,즉수거전수、수거존저、격려궤제진행료종술.
Over the past decade, peer-to-peer(P2P) based video-on-demand(VoD) systems have received a tremendous amount of attention. They are immensely attractive because of their cheap deployment and high scalability compared to traditional Client/Server(C/S) based VoD systems. However, due to the instability and heterogeneity of P2P networks, there are many challenges in designing, implementing, and deploying such systems. For instance, the lack of resources(e. g. , source nodes, bandwidth, storage, etc.) usually becomes a barrier that prevents practical systems from normal operation. Based on the observation, this paper outlines the components of existing VoD/P2P architectures and surveys approaches to their design, focusing on how to make full, use of limited resources in P2P based VoD systems. Specifically, the authors present a survey in three aspects:(1) data transmission, referring to how to make full use of nodes' bandwidth;(2) data storage, referring to how to make full use of nodes' storage; and(3) incentive mechanisms that stimulate nodes to contribute more resources.