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We consider energy efficient base station sleeping and clustering problems in cooperative cellular networks where clusters of base stations jointly transmit to users. Our key idea of energy saving is to exploit a spatio-temporal fluctuation of traffic demand, which is to use minimal energy to provide capacity only slightly greater than varying traffic demand. Then, energy saving is possible without...
Energy efficiency is one of the most important issues of Wireless sensor networks (WSN) due to limited battery capacity. In sink-centric WSN (i.e., sensing data is collected by the sink node), this issue is particularly challenging due to the ‘funnel effect’ which means high energy consumption of the nodes near the sink. While clustering can be used to achieve scalability of WSN, previous works on...
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