Energy Efficiency Analysis for Future 3D Mobile Networks with Strategic Sleep Mode

In 5G system, network densification is considered as a prospective technology to provide the required capacity and performances. However, the large-scale deployment of Small Base Stations (SBSs) leads to the rapid increases in energy consumption. Thus in this paper, a strategic sleep mode is put forward to improve the network energy efficiency in 3D dense mobile networks, where the SBSs active probability is associated with user active probability and network load. Then, the coverage probability and energy efficiency expressions are derived based on the proposed strategic sleep mode by using the tool of 3D stochastic geometry, where the locations of SBSs is modeled as 3D spatial Poisson Point Process. In addition, numerical results are further conducted to evaluate the advantage of the proposed sleep mode and verify the accuracy of the theoretical analysis.