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With the advancement of broadband networking technology, many clients are enabled to enjoy various Video on Demand (VoD) services. To provide VoD services to a number of clients, the network needs to consider various factors together; they are each viewer's waiting time, buffer requirement at the client, channel management for video delivery, and complexity for video segmentation. Among the currently available VoD approaches, the Polyharmonic broadcasting approach and the staircase multicasting approach show the best performance in terms of viewer's waiting time and buffer requirement, respectively. However, these approaches need to divide a video into too many segments, and require many channels at a time.
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