System for processing dynamic query using semantic prefetching scheme based on description in location-based services

摘要

A system for processing dynamic query using semantic pre-fetching scheme based on description in position-based services is provided to obtain a query result from a cache of a mobile client by using a semantic pre-fetching method in mobile computing environment using a restrictive bandwidth. A log storage(202) stores a log file received from a mobile client(220). A log analyzer(204) analyzes the log file. A pre-fetching manager(206) determines a pre-fetching description delivered to the mobile client. A query generator(222) generates a range query and a nearest neighbor query. A cache storage(224) stores cached information, and renews a description table according to a predetermined cache replacement strategy. A query analyzer(226) analyzes a kind of the query. A cache manager(228) retransmits a rest query different from a content of a cache stored in the cache storage to a server(200). When the mobile client enters a semantic pre-fetching area supporting high speed data transmission, the mobile client obtains semantic information about position dependent data from the server.