Research On Energy Saving Technologies Of Wireless Cellular Network Based On Sleeping Policy

As one of the most important aspects of the various industries in the whole society, mobile communications has gradually influenced people’s ways of living and working. In the past several decades, communication industry has focused on building a global mobile network of seamless coverage and high quality to meet people’s requirement of enjoying high-speed and convenient mobile network services anytime and anywhere. Nowadays, with green environmental protection and energy saving becoming the major concerns worldwide, energy saving of wireless cellular network has gained more and more attention.The energy saving technologies of cellular network based on sleeping policy include three levels, component, link and network. Allowing the system to shut down an entire BS, sleeping policy of network level is one of the most highly energy saving technologies, and it gains more and more people’s extensive concerning. However, a few problems are still remained to be solved after introducing the sleeping policy, such as which site needs to sleep and when to sleep and so on. The network topology control mechanism proposed in this paper is based on these problems, aiming at improving the energy efficiency of the whole network. The composing forms of future cellular network are diverse, for instance, the relay nodes are applied or the transmission mode of CoMP is utilized. In view of this situation, this paper does some research on the selection of energy effective transmission modes.This paper first introduces the existing technologies and methods of wireless cellular network energy saving and then summarizes the metrics of energy efficiency. Next, two innovative points, a high energy efficiency network topology control mechanism based on sleeping method and a high energy efficiency network transmission mode selection mechanism based on sleeping method, are proposed. The former considers both QoS and power consumption of the whole network. The network topology can be reconfigured and optimized from the view of energy efficiency. The simulation results show that the network topology control mechanism can improve the energy efficiency effectively, especially in low traffic. On the basis of the circus power consumption and node sleeping technology, the latter considers both transmission mode selection and relay selection. The systematical simulation results show that, compared with the transmission mode mechanism of traditional network system without relay nodes, two-hop cellular system and cooperative communication system, the transmission mode selection mechanism can effectively improve the energy efficiency of the system.