Energy efficient broadcast radius optimization in cellular networks

In this paper, we study the optimal broadcast radius in cellular network from the perspective of energy efficiency. Firstly, we consider the scenario where the base stations have already been deployed. The relationship between the power-saving gain and the possible energy efficient broadcast radius is derived. Based on it, we investigate the optimal number of tiers of cells in the broadcast range. Next, we turn to the scenario with the base stations to be deployed. The power consumption per effective coverage area is defined to measure the energy efficiency of different broadcast radius, based on which we analyze the optimal broadcast radius under different channel conditions. Simulation results confirm that the optimal energy efficient broadcast radius is positively correlated with the static power of the broadcast channel, negatively correlated with the minimal required broadcast service rate in the two scenarios, and negatively correlated with the original cell radius in the first scenario.