Valid Location Measuring in Location Dependent Data for Mobile Environments

Data caching is a crucial issue to improve system performance for service centers and increase access efficiency for mobile clients in mobile environments. Unlike conventional distributed systems, the mobility of users is the major characteristic in a mobile computing environment so that the value of data may depend on location, and processing of a query at one site may give different results than that at another. In this paper, we study issues on the efficiency of temporal dependent and spatial-dependent for location-dependent data in a mobile computing environment. We provide the method called valid location measuring (VLM) for representing the impacts on system performance with data valid scope and time-stamp of location-dependent data over wireless environments. Simulation experiments are conducted to compare the performance of our method with other issues. The results show that our schemes outperform the conventional strategies.