Caching modeling and energy analyzing of cell-free wireless heterogeneous networks with beta Ginibre point process

Abstract

Cell-free Wireless Heterogeneous Networks (HetNets) have emerged as a technological alternative for conventional cellular networks. In this paper, we study the spatially correlative caching strategy, the energy analysis, and the impact of parameter β on the total energy cost of the cell-free wireless HetNets with Access Points distributed by Beta Ginibre Point Process (β-GPP). We derive the approximate expression of Successful Delivery Probability (SDP) based on the Signal-to-Interference-plus-Noise Ratio coverage model. From both analytical and simulation results, it is shown that the proposed caching model based on β–GPP placement, which jointly takes into account path loss, fading, and interference, can closely simulate the caching performance of the cell-free HetNets in terms of SDP. By guaranteeing the outage probability constraints, the analytical expression of the uplink energy cost is also derived. Another conclusion is that with AP locations modeled by β-GPP, the power consumption is not sensitive to β, but is sensitive to the dimension of the kernel function; hence β is less restrictive, and only the truncation of the Ginibre kernel has to be appropriately modified. These findings are new compared with the existing literature where the nodes are commonly assumed to be of Poisson Point Process, Matérn Hard-Core Process, or Poisson Cluster Process deployment in cell-free systems.

Keywords

• Caching model
• Energy analysis
• Cell-free HetNets
• β-GPP