A safe exit algorithm for continuous nearest neighbor monitoring in road networks

  • Authors:

  • Hyung-Ju Cho;Se Jin Kwon;Tae-Sun Chung

  • Affiliations:

  • Department of Information & Computer Engineering, Ajou University Woncheon-dong, Suwon Si Yeongtong-gu, Gyeonggi-Do, South Korea;Department of Information & Computer Engineering, Ajou University Woncheon-dong, Suwon Si Yeongtong-gu, Gyeonggi-Do, South Korea;Department of Information & Computer Engineering, Ajou University Woncheon-dong, Suwon Si Yeongtong-gu, Gyeonggi-Do, South Korea

  • Venue:
  • Mobile Information Systems
  • Year:
  • 2013

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Abstract

Query processing in road networks has been studied extensively in recent years. However, the processing of moving queries in road networks has received little attention. In this paper, we introduce a new algorithm called the Safe Exit Algorithm SEA, which can efficiently compute the safe exit points of a moving nearest neighbor NN query on road networks. The safe region of a query is an area where the query result remains unchanged, provided that the query remains inside the safe region At each safe exit point, the safe region of a query and its non-safe region meet so that a set of safe exit points represents the border of the safe region. Before reaching a safe exit point, the client query object does not have to request the server to re-evaluate the query This significantly reduces the server processing costs and the communication costs between the server and moving clients. Extensive experimental results show that SEA outperforms a conventional algorithm by up to two orders of magnitude in terms of communication costs and computation costs