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In carrier sense multiple access with collision avoidance (CSMA/CA) wireless networks, <i>adaptive</i> physical carrier sense (CS) mechanisms have been proposed to maximize spatial reuse and to mitigate packet collisions in various wireless networking environments. Most of them attempt to reduce the carrier sensing range for higher throughput performance as(More)
We propose an adaptive carrier sense (CS) scheme with enhanced fairness based on an observation that the conventional adaptive CS mechanism may lead to significant unfairness. Our experimental study with an IEEE 802.15.4 WPAN testbed shows that the proposed algorithm significantly improves fairness compared to the conventional mechanism while providing(More)
Cognitive radio networks are an emerging paradigm for intelligent networks to resolve the spectrum under-utilization problem, as they allow cognitive users to utilize frequency bands assigned to primary users. In this paper, we consider the transmit power control of a secondary transmitter when a primary user accesses a wireless channel through a carrier(More)
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