Energy Savings With CoMP Technology For Densely Deployed Small Cell Networks

With the explosive growth of mobile users and wireless data services, operators deploy a large number of small cells with lower power, smaller coverage and more flexible deployment in the range of traditional macrocell networks. Small cell not only can increase the capacity of the cellular network system, but also can effectively achieve seamless coverage for the hot spots. While rapid development of small cells brings lots of energy consumption which cannot be ignored due to energy shortages and declining environmental quality, so the energy consumption of small cell networks has become a noticeable problem.In this paper, we study the energy waste issue caused by that the traffic load varies with time and space in densely deployed small cell networks, and we propose a energy-saving scheme that powers off lightly-loaded small cells and switch the users of those small cells to the cooperative clusters constituted by their neighbor small cells with Coordinate Multi-Point(Co MP) technology. Firstly, based on the power model of small cells and Co MP technology, we establish a system model to minimize energy consumption of all small cells by considering the Qo S of users; then, decompose the mathematical model which minimize the total energy consumption of the network into two subproblems, one is to maximize energy savings of the small cell in sleep mode, the other is to maximize the number of small cells in sleep mode, and then accomplish the choice of dormant small cells and the cooperative clusters with relevant proofs so as to achieve better energy efficiency; finally the simulation results show that our proposed algorithm can improve system energy efficiency significantly.