A novel approach of sensor data retrieving using a quadcopter in wireless sensor network forming concentric circular topology

Paper describes a concentric circular wireless sensor network topology and sensor data retrieving strategy using a mobile sink. A quadcopter acts as a mobile sink. The strategy states how to improve network lifetime by reducing energy consumption of power constrained sensor nodes. It eliminates packet routing and optimizes packet retransmissions by reducing packet error, packet loss and packet collisions. Sensors are uniformly distributed across the sensor field of size r×r in such a way that they are almost all placed inside an inscribed disk D of radius r. Network is formed by creating concentric circles around the center and partitions the disk into n annuli. Each annulus is further divided into m wedges by partitioning the disk into sectors. Sensors n_ik belong to each wedge W_ik,(∀1 ≤ ı k ≤ m; n) form Star network with the sink. At each level k, sink optimizes its pose p_k ∈ W_ik so that every nodes can send their data by one hop communication. The strategy will be extremely useful for data collection when large holes are formed inside the network due to nodes failure and results network partition.