Video placement and configuration of distributed video servers on cable TV networks

作     者：Vassilakis, C Paterakis, M Triantafillou, P 

作者机构：Tech Univ Crete Dept Elect & Comp Engn GR-73100 Chania Greece Multimedia Syst Inst Crete TUC GR-73100 Chania Greece 

出 版 物：《MULTIMEDIA SYSTEMS》 (多媒体系统)

年 卷 期：2000年第8卷第2期

页      面：92-104页

核心收录：

学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：distributed VOD systems program placement HFC distribution networks 

摘      要：A large-scale, distributed video-on-demand (VOD) system allows geographically dispersed residential and business users to access video services. such as movies and other multimedia programs or documents on demand from video servers on a high-speed network. In this paper. we first demonstrate through analysis and simulation the need for a hierarchical architecture for the VOD distribution network. We then assume a hierarchical architecture, which fits thr existing tree topology used in today s cable TV (CATV) hybrid fiber/coaxial (HFC) distribution networks. We develop a model for the video program placement. configuration, and performance evaluation of such systems. Our approach takes into account the user behavior. the fact that the user requests are transmitted over a shared channel before reaching the video server containing the requested program, the fact that the input/output (I/O) capacity of the video servers is the costlier resource, and finally the communication cost. In addition, our model employs batching of user requests at the video servers. We study the effect of batching on the performance of the video servers and on the quality of service (QoS) delivered to the user, and we contribute dynamic hatching policies which improve server utilization, user QoS, and lower the servers cost. The evaluation is based on an extensive analytical and simulation study.