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Accurate and fast wireless Link Quality Assessment (LQA) for wireless channels would bring in huge benefits for mobile multi-hop and multi-rate wireless ad hoc and sensor networks in the form of improved end-to-end performance. This paper proposes a novel LQA method based on cross-layer information. The algorithm is implemented in a real test bed, which is based on IEEE 802.11, and achieved a significant LQA improvement up to 50 % in mobile scenarios without introducing overhead. The effectiveness of accurate and fast LQA is demonstrated by feeding it into the routing layer to enable the route decisions to adapt faster and more accurately during changing situations, especially in mobile scenarios.
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