The sensor nodes of a wireless grain depot surveillance system are deployed in crystal grids, which provide lot of valid position information. To avoid the energy consumption unbalance of the single hop routing model adopted by LEACH prot

To save energy in Wireless Sensor Networks (WSNs) and prolong the network lifetime, many works investigate the use of one or more mobile sinks. These solutions are mainly based on organizing the network within a grid to simplify the computation of th