In a mobile/pervasive computing environment

one of the most important goals of monitoring continuous spatial queries is to reduce communication cost for location-updates. Existing work uses many cellular wireless connections

which would easily become the performance bottleneck of the overall system. This paper introduces a novel continuous

k

NN query monitoring method to reduce communication cost in the hybrid wireless network

where the moving objects in the wireless broadcasting system construct the ad-hoc network. Simulation results prove the efficiency of the proposed method

which leverages the wireless broadcasting channel as well as the WiFi link to alleviate the burden on the cellular uplink communication cost.