In Mobile Wireless Sensor Networks (MWSN) with a sparse node population

an end-to-end path may be broken frequently or may not exist at any time due to nodes’ mobility

which makes it impossible to apply the existing shortest-path routing protocols based on static topology for MWSN.An RSSI-based opportunistic routing protocol for MWSN

called OR-RSSI

is proposed in this paper.In OR-RSSI

Opportunistic Probability(OP)based on the RSSI of the Sink’s Beacon packets and Mobility Vector (MV) is established and the best node with the highest OP is chosen to store and relay packets at each hop after packets are broadcasted.Simulation results show that OR-RSSI performs better on successful delivery ratio

goodput and energy overhead as compared with traditional TinyAODV.