A node failures tolerent spatial window query processing algorithm called GSA was proposed. The grid size parameter was studied and a grid-based data collection schedule scheme to avoid the message collisions in the process of data collection was proposed. Finally
the influence of node density
the probability of node failure
query region size on the success rate of a query and the influence of node density
query message size
sensed data size
query region size
the probability of node failure on energy consumption were analysed. Analytical and experimental results show that in most cases GSA outperforms IWQE.