The traffic load in cellular networks varies significantly in time and space depending on various factors, such as user mobility. For example, while traffic density is high in working areas during the day, it is much lower in residential and living areas [3]. In the evening, we can observe the opposite of this traffic density model. Setting the operating parameters of each BS to the most dense time statistics results in serving cells running under their own capacities [4]. Fixed cell planing is not able to support the changing traffic loads. In the future, this traffic fluctuation is expected to become a much more serious problem.

The drive to make cellular networks greener begins with the BSs since they consume the greatest amount of energy in the network (around 60%)[5]. In next generation wireless network systems, EE and traffic stability can be expected to increase by changing the coverage area of BSs using two basic methods.