Geographic routing metric in wireless sensor networks

To solve the problem that the geographic routing using traditional greedy metric decreases the packet delivery rate on non-ideal communication links, a new routing metric SRAB for geographic routing is proposed and implemented based on link quality. The SRAB estimates the relevant link quality through monitoring packets from neighbor nodes periodically to obtain the sequence of link layers, and computes the cost for packets traversing on the link from its link quality. Then the SRAB calculates the Euclidean distances from the current node and its neighbor nodes to the destination based on nodes' geographic positions, respectively, and gets the progresses from the neighbor nodes toward the destination. The SRAB utilizes the blacklist approach to filter neighbor nodes with link quality less than the threshold, and chooses the next hop that has the maximum progress toward the destination per unit cost from the neighbor nodes. The simulation results and comparisons with the traditional greedy metric on the non-ideal links show that the SRAB increases packet delivery rate by 22% and decreases energy consumption by 12%.