Api2t: a bit of improvement for applications in critical scenarios

Location awareness in wireless sensor network (WSNs) application is often too expensive to be achieved by endowing each node with use a GPS receiver. Approach based on range-free methods, where nodes can estimate their location basing on neighbors and nodes that known their position (anchors), can be envisaged. This paper deals with the optimization of APIT algorithm in wide area WSN scenario for critical scenarios applications. The new version, called API2T, is able to face the incorrect estimation of node localization by reducing missing detection probability and, thus, providing a better accuracy as shown in the simulation results. In particular, a remarkable performance improvement is provided for random topologies and low density of anchors, as it might happens in emergency scenarios.