6.4 Conclusions

In this chapter, we analyzed the coordination problem in opportunistic routing. We first reviewed and analyzed five state-of-the-art candidate coordination schemes, and based on this analysis we proposed a new coordination scheme: “fast slotted acknowledgment” (FSA), which fully takes advantage of the channel detection approach to coordinate the packet forwarding among multiple candidates. We compared FSA with those state-of-the-art schemes and simulation results show that it achieves better performance in all the metrics, especially in time delay. The simulation also validated that FSA can achieve similar performance to ideal coordination where relay priority can be ensured and duplicate packet forwarding is avoided.