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Broadcast Method based on Data Access Frequencies and Semantic Relationships in Mobile Computing Environments  

최성환 (서강대학교 컴퓨터학과)
정성원 (서강대학교 컴퓨터학과)
이송이 (성신여자대학교 컴퓨터정보학부)
Abstract
Data broadcast is an effective data transmission method from a data base server to numerous mobile clients due to the restrictions on mobile environment such as low wireless communication bandwidth and energy shortage of mobile devices. There are various broadcast methods based on clients' data access frequencies or semantic relationship of data. The broadcast schedule based only on the access frequencies does not consider semantic relations of data, so that when a client needs to access a series of semantically related data, the client has to listen to the wireless channel for a long time. On the other hand, the broadcast schedule based only on semantic relationship of data makes data access time longer when clients highly request specific data which are not semantically related but frequently accessed. In this paper, we present an efficient data broadcast method based on not only data access frequencies but also semantic relationship to improve mobile clients' query response time. The new hybrid broadcast method we propose creates a data broadcast schedule according to the data access frequencies and then the schedule is adjusted to reflect semantic relationship of data. We show our method is efficient by experimental performance analysis.
Keywords
mobile computing; mobile clients; broadcast; wireless channels; data access frequency; semantic relationships;
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