Semantic data broadcast for a mobile environment based on dynamic and adaptive chunking

Ken C.K. Lee, Hong Va Leong, Antonio Si

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)


Database broadcast is an effective and scalable approach to disseminate information of high affinity to a large collection of mobile clients. A common problem of existing broadcast approaches is the lack of knowledge for a client to determine if all data items satisfying its query could be obtained from the broadcast. We therefore propose a semantic-based broadcast approach. A semantic descriptor is attached to each broadcast unit, called a data chunk. This semantic descriptor allows a client to determine if a query can be answered entirely based on broadcast items and, if needed, identify the precise definition of the remaining items in the form of a "supplementary" query. Data chunks can be of static or dynamic sizes and organized hierarchically. Their boundary can be determined on-the-fly, adaptive to the nature of client queries. We investigate different ways of organizing the data chunks over a broadcast channel to improve access performance. We introduce the data affinity index metric, which more accurately reflects client-perceived performance. A simulation model is built to evaluate our semantic-based broadcast schemes.
Original languageEnglish
Pages (from-to)1253-1268
Number of pages16
JournalIEEE Transactions on Computers
Issue number10
Publication statusPublished - 1 Oct 2002


  • Adaptive chunking
  • Answerability
  • Dynamic chunking
  • Mobile databases
  • Semantic-based broadcast

ASJC Scopus subject areas

  • Software
  • Theoretical Computer Science
  • Hardware and Architecture
  • Computational Theory and Mathematics


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