Multihop Wireless Networks: Opportunistic Routing

8.7 Conclusion

In this chapter, we studied MGOR, and examined the factors that affect its performance, which include multirate capability, candidate selection, prioritization, and coordination. Based on our analysis, we proposed the local metric, the OEOT, to characterize the tradeoff between packet advancement and medium time cost under different data rates. We further proposed a rate and candidate selection algorithm to approach the local optimum of this metric. We presented a multirate link-quality measurement mechanism to provide the link packet reception ratio information for the network layer to assist routing decision. We compared the performance of MGOR with single-rate GOR, single-rate GR and multirate GR. Simulation results show that the MGOR incorporating the rate adaptation and candidate selection algorithm achieves the highest throughput and lowest delay among all the protocols.