NRP: Neighbour-based mobicast protocol and SNRP: Spatial neighbour-based mobicast protocol for wireless sensor networks

In this paper, we present two new ldquospatiotemporal multicastrdquo protocols for supporting applications which require spatiotemporal coordination in sensor networks. The spatiotemporal character of mobicast relates to the obligation to deliver a message to all the nodes that will be present at time t in some geographic zone Z, where both the location and shape of the delivery zone are a function of time over some interval (t_start, t_end). New protocols, called Neighbor-Based Routing Protocol (NRP) and Spatial Neighbor-Based Routing Protocol (SNRP) exploit ideas adapted from existing protocols were suggested before. In both protocols we have a primary set of solutions to determine the size of forwarding zone. Each node uses the number of its neighbors to select the best solution from the set. In NRP the number of direct neighbors is used, but in SNRP choosing the solution is based on spatial neighbors. Simulation results show that NRP and SNRP are power efficient protocols. Finally comparison with existing mobicast routing protocols illustrates the performance enhancement in message overhead, average of slack time, and power consumption.