Communications in underwater wireless sensor networks have a lot of limitations as compared to those in terrestrial sensor networks. In wireless sensor networks, a routing protocol finds a path between the source and sink nodes according to a routing metric. The hop count is the most widely used routing metric, however, it cannot reflect the quality of a link. It is expected that a link quality aware metric such as ETX can contribute to improving the performance, especially in underwater sensor networks (UWSNs). However, the direct adoption of ETX in UWSNs may not provide expected performance. In this paper, we investigate the effect of ETX measurement on the performance in UWSNs through NS-2 simulations.
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