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In this paper, the authors propose a cooperative and selforganizing energy efficient access network framework for heterogeneous cellular systems. Intranetwork and internetwork cooperation are jointly employed for optimizing the energy savings. In intranetwork cooperation, based on the instantaneous traffic, Base Transceiver Stations (BTSs) in a network cooperatively and intelligently swap traffic, switch operating modes, and thus conserve energy. While, using internetwork cooperation, multiple networks are engaged cooperatively to share their BTSs for further optimizing energy savings.
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