| Dealing with Continuous Location-Dependent Queries: Just-in-Time Data Refreshment\Lambda (2009) | |||||||||||||||
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| Abstract Among mobile computing applications, location-based services are expected to be a big business for wireless operators. These services provide value added by considering the location of the user in order to give him/her more customized information. However, the processing of continuous location-dependent queries is still a subject of research. One of the key issues is how to update the answer presented to the user efficiently as it becomes obsolete very quickly. The goal of this paper is to analyze how to deal with situations where the answer cannot be updated with the desired frequency. We present several approaches to this problem and evaluate their performance. 1 Introduction Nowadays, it is growing the interest in designing data services/applications that can be performed efficiently in mobile computing environments. In particular, locationbased services are considered one of most important future applications of mobile and wireless systems. A sample location-dependent query (i.e., queries whose answer depends on the location of objects) is "show me the available taxi cabs within three miles of my current location", which could be very useful, for example, for a user looking for an available taxi cab while walking home. Similarly, a taxi cab could ask about nearby people looking for a taxi cab, offering a better service than that of waiting at taxi stops or wandering the streets. | |||||||||||||||
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