Abstract
In WSNs, energy conservation is the primary goal, while throughput and delay are less important. This results in a tradeoff between performance (e.g., throughput, delay, jitter, and packet-loss-rate) and energy consumption. In this paper, to jointly optimize performance and energy consumption, firstly, we carry out a comprehensive analysis of bandwidth and power efficiency of IEEE 802.15.4 WSNs. Secondly, a power-efficient MAC protocol, PeMAC, and a bandwith-efficient MAC protocol, BeMAC, are presented in this paper. In PeMAC and BeMAC, based on power and bandwidth efficiency criterion respectively, each node independently adjusts its contention parameters (e.g., the minimum back-off period) to the estimated system state (e.g., the number of competing nodes). Simulation results show that PeMAC and BeMAC can increase the power and bandwidth efficiency respectively while still maintaining reasonable system performance.
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