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 capacity loss. However, it is highly challenging to design
traffic-aware algorithms without the future traffic demand information. To overcome this, we …

We consider energy efficient base station (BS) 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 spatio-temporal fluctuation of traffic demand, and use
minimal energy to provide achievable data rate only slightly greater than varying traffic
demand. However, it is highly challenging to design traffic-aware algorithms without the
future traffic demand information. To overcome this difficulty, we develop joint BS sleeping …