Energy efficiency-based cell switch on-off strategy under heterogeneous services

In order to improve the energy efficiency of wireless communication systems, by taking into consideration the tidal property of user demands, a strategy to improve energy efficiency for cellular system is proposed on the basis of cell switch on-off. In this strategy, the demands of users are divided into constant-bit-rate (CBR) and variable-bit-rate (VBR) demands to maximize the energy efficiency under the constraint that CBR demands are fulfilled. Moreover, an improved genetic algorithm (GA) is employed to solve the constrained optimization problem, and the switch on-off states of base stations are encoded with binary sequence, followed with specifically-designed selection, crossover and mutation operators. Simulated results show that the proposed GA algorithm achieves fast convergence and prevents prematurity of chromosome population; and that the proposed cell switch on-off strategy effectively improves system's energy efficiency and guarantees the demand of CBR service, so that it is of high performance close to the exhaustive searching algorithm. ©, 2015, South China University of Technology. All right reserved.