Search K-Nearest Neighbors On Air

Publication Type

Conference Proceeding Article

Publication Date

1-2003

Abstract

While the K-Nearest-Neighbor (KNN) problem is well studied in the traditional wired, disk-based client-server environment, it has not been tackled in a wireless broadcast environment. In this paper, the problem of organizing location dependent data and answering KNN queries on air are investigated. The linear property of wireless broadcast media and power conserving requirement of mobile devices make this problem particularly interesting and challenging. An efficient data organization, called sorted list, and the corresponding search algorithm are proposed and compared with the well-known spatial index,R-Tree. In addition, we develop an approximate search scope to guide the search at the very beginning of the search process and a learning algorithm to adapt the search scope during the search to improve energy and access efficiency. Simulation based performance evaluation is conducted to compare sorted list and R-Tree. The results show that the utilization of search scope and learning algorithm improves search efficiency of both index mechanisms significantly. While R-Tree is more power efficient when a large number of nearest neighbors is requested, the sorted list has better access efficiency and less power consumption when the number of nearest neighbors is small.

Keywords

KNN, location-dependent search, wireless broadcast, index structure, mobile computing

Discipline

Databases and Information Systems | Numerical Analysis and Scientific Computing

Publication

Mobile Data Management: 4th International Conference, MDM 2003 Melbourne, Australia, January 21-24, 2003: Proceedings

Volume

2574

First Page

181

Last Page

195

ISBN

9783540363897

Identifier

10.1007/3-540-36389-0_13

Publisher

Springer Verlag

City or Country

Berlin

Additional URL

http://dx.doi.org/10.1007/3-540-36389-0_13

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