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Financial and environmental considerations have motivated a trend in wireless communication network design and operation to minimize the amount of energy consumption. Such a trend is referred to as green radio communications. In this paper, network cooperation is investigated as a means of energy saving. Networks with overlapped coverage can cooperate to reduce their energy consumption by alternately switching on and off their resources according to the traffic load conditions. The authors present an optimal resource on-off switching framework that adapts to the fluctuations in the traffic load and maximizes the amount of energy saving under service quality constraints, in a cooperative networking environment.
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