Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/10115
Title: Semantic data broadcast for a mobile environment based on dynamic and adaptive chunking
Authors: Lee, KCK
Leong, HV 
Si, A
Keywords: Adaptive chunking
Answerability
Dynamic chunking
Mobile databases
Semantic-based broadcast
Issue Date: 2002
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on computers, 2002, v. 51, no. 10, p. 1253-1268 How to cite?
Journal: IEEE transactions on computers 
Abstract: 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.
URI: http://hdl.handle.net/10397/10115
ISSN: 0018-9340
EISSN: 1557-9956
DOI: 10.1109/TC.2002.1039851
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