Optimal Tradeoff Between Exposed and Hidden Nodes in Large Wireless Networks

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Executive Summary

Wireless networks equipped with the CSMA protocol are subject to collisions due to interference. For a given interference range the authors investigate the trade-off between collisions (hidden nodes) and unused capacity (exposed nodes). They determine the optimal sensing range that maximizes throughput and critically depends on the activation rate of nodes. For infinite line networks, they prove the existence of a threshold: when the activation rate is below this thresh-old the optimal sensing range is small (to maximize spatial reuse).

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