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Routing metrics are essential to achieve a good end-to-end throughput on a min-cost path in multi-hop wireless networks. Originally, most routing algorithms were based on min-hop count metric. Then link-quality aware metrics, ETX and ETT, are proposed. After that, the emergence of opportunistic and any-path routing, leads to metrics such as EOTX and EAX. But almost all the previous routing metrics take the sum of all the link weights when choosing a min-cost path. They ignore that a pair of links on a path might be able to transmit at the same time without interference and hence it is inappropriate to include both of their weights in the whole path.
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