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Reordering Scheme of Location Identifiers for Indexing RFID Tags  

Ahn, Sung-Woo (부산대학교 컴퓨터공학과)
Hong, Bong-Hee (부산대학교 컴퓨터공학과)
Publication Information
Journal of KIISE:Databases / v.36, no.3, 2009 , pp. 198-214 More about this Journal
Abstract
Trajectories of RFID tags can be modeled as a line, denoted by tag interval, captured by an RFID reader and indexed in a three-dimensional domain, with the axes being the tag identifier (TID), the location identifier (LID), and the time (TIME). Distribution of tag intervals in the domain space is an important factor for efficient processing of a query for tracing tags and is changed according to arranging coordinates of each domain. Particularly, the arrangement of LIDs in the domain has an effect on the performance of queries retrieving the traces of tags as times goes by because it provides the location information of tags. Therefore, it is necessary to determine the optimal ordering of LIDs in order to perform queries efficiently for retrieving tag intervals from the index. To do this, we propose LID proximity for reordering previously assigned LIDs to new LIDs and define the LID proximity function for storing tag intervals accessed together closely in index nodes when a query is processed. To determine the sequence of LIDs in the domain, we also propose a reordering scheme of LIDs based on LID proximity. Our experiments show that the proposed reordering scheme considerably improves the performance of Queries for tracing tag locations comparing with the previous method of assigning LIDs.
Keywords
RFID; middleware; Query for tracing tags; location identifier; proximity; ordering; spatio-temporal database;
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