Performance Evaluation of Link Quality Estimation Metrics for Static Multihop Wireless Sensor Networks

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Executive Summary

The lossy nature of wireless communication leads to many challenges while designing multihop networks. As an integral part of reliable communication in wireless networks, effective link estimation is essential for routing protocols. Recent studies have shown that link reliability-based metrics like ETX have better performance than traditional metrics such as hop count or latency. Usually, such metrics employ techniques like blacklisting, involving thresholds during the link estimation process. In this paper, the authors conduct a detailed performance analysis of three commonly used link-quality metrics in wireless sensor networks: ETX, 4Bit, and RNP. They study the interplay between these metrics and CTP, a tree-based routing protocol provided by TinyOS.

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