An enhanced client-centric approach for efficient video broadcast

  • Authors:

  • Ashwin Natarajan;Ying Cai;Johnny Wong

  • Affiliations:

  • Department of Computer Science, Iowa State University, Ames, USA 50011;Department of Computer Science, Iowa State University, Ames, USA 50011;Department of Computer Science, Iowa State University, Ames, USA 50011

  • Venue:
  • Multimedia Tools and Applications
  • Year:
  • 2009

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Abstract

Periodic broadcast is a cost-effective solution for large-scale distribution of popular videos. Regardless of the number of video requests, this strategy guarantees a constant worst service latency to all clients, making it possible to serve a large community with a minimal amount of broadcast bandwidth. Although many efficient periodic broadcast techniques have been proposed, most of them impose rigid requirements on client receiving bandwidth. They either demand clients to have the same bandwidth as the video server, or limit them to receive no more than two video streams at any one time. In our previous work, we addressed this problem with a Client-Centric Approach (CCA). This scheme takes into consideration both server broadcast bandwidth and client receiving bandwidth and allows clients to use all their receiving capability for prefetching broadcast data. As a result, given a fixed broadcast bandwidth, a shorter broadcast period can be achieved with an improved client communication capability. In this paper, we present an enhanced version of CCA to further leverage client bandwidth for more efficient video broadcast. The new scheme reduces the broadcast latency up to 50% as compared to CCA. We prove the correctness of this new technique and provide an analytical evaluation to show its performance advantage as compared with some existing techniques.