Cognitive Network Cooperation for Green Cellular Networks

Green networking is the method of incorporating energy efficient technologies for reducing the resource use as possible. Now a days, , there has been an increasing attention in green cellular networks for the sake of reducing the energy dissipated by communications and networking systems, including the base stations (BSs) and battery-powered user terminals (UTs). The joint employment of cognition and cooperation techniques can be invoked for improving the energy efficiency of cellular networks. To be clear, the cellular devices first have to identify the unused spectral bands (known as spectrum holes) using their spectrum sensing functionality. This idea is termed cognitive network cooperation, since different wireless access networks cognitively cooperate with cellular networks. It is shown that for a given number of information bits to be transmitted, the total energy consumed can be significantly lowered, when both cognition and cooperation are supported in cellular networks.