Routing protocols for wireless ad hoc networks have traditionally focused on \ufb01nding paths with minimum hop count. However, such paths can include slow or lossy links, leading to poor throughput. A routing algorithm can select better paths by explicitly taking the quality of the wireless links into account. In this paper, we conduct a detailed, empirical evaluation of the performance of three link-quality metrics\u2014 ETX, per-hop RTT, and per-hop packet pair\u2014and compare them against minimum hop count. We study these metrics using a DSR-based routing protocol running in a wireless testbed. We \ufb01nd that the ETX metric has the best performance when all nodes are stationary. We also \ufb01nd that the per-hop RTT and per-hop packet-pair metrics perform poorly due to self-interference. Interestingly, the hop-count metric outperforms all of the link-quality metrics in a scenario where the sender is mobile.<\/p>\n","protected":false},"excerpt":{"rendered":"
Routing protocols for wireless ad hoc networks have traditionally focused on \ufb01nding paths with minimum hop count. However, such paths can include slow or lossy links, leading to poor throughput. A routing algorithm can select better paths by explicitly taking the quality of the wireless links into account. In this paper, we conduct a detailed, 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