Wireless networks equipped with the CSMA protocol are subject to collisions due to interference. For a given interference range we investigate the tradeoff between collisions
(hidden nodes) and unused capacity (exposed nodes). We show that the sensing range that maximizes throughput critically depends on the activation rate of nodes. For infinite
line networks, we prove the existence of a threshold: When the activation rate is below this threshold the optimal sensing range is small (to maximize spatial reuse). When the activation rate is above the threshold the optimal sensing range is just large enough to preclude all collisions. Simulations suggest that this threshold policy extends to more
complex linear and non-linear topologies.
|Title of host publication||Proceedings of the International Conference on Measurements and Modeling of Computer Systems (SIGMETRICS 2010, New York NY, USA, June 14-18, 2010)|
|Publication status||Published - 2010|
|Name||ACM SIGMETRICS Performance Evaluation Review|