Multimedia object placement for transparent data replication

Keqiu Li, Hong Shen, Francis Y.L. Chin, Weishi Zhang

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Transparent data replication is a promising technique for improving the system performance of a large distributed network. Transcoding is an important technology which adapts the same multimedia object to diverse mobile appliances; thus, users' requests for a specified version of a multimedia object could be served by a more detailed version cached according to transcoding. Therefore, it is particularly of theoretical and practical necessity to determine the proper version to be cached at each node such that the specified objective is achieved. In this paper, we address the problem of multimedia object placement for transparent data replication. The performance objective is to minimize the total access cost by considering both transmission cost and transcoding cost. We present optimal solutions for different cases for this problem. The performance of the proposed solutions is evaluated with a set of carefully designed simulation experiments for various performance metrics over a wide range of system parameters. The simulation results show that our solution consistently and significantly outperforms comparison solutions in terms of all the performance metrics considered.

Original languageEnglish
Pages (from-to)212-224
Number of pages13
JournalIEEE Transactions on Parallel and Distributed Systems
Issue number2
Publication statusPublished - Feb 2007
Externally publishedYes


  • Multimedia
  • Object placement
  • Optimization
  • Transcoding
  • Transparent data access
  • Web caching


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