Research On D2D Technology Based On Spatial Poisson Point Process

ABSTRACT:As one of the key technologies in the5th generation mobile communication (5G), Device-to-Device (D2D) technology can significantly improve the system spectrum efficiency and the system capacity. However, the introduction of D2D communication into cellular networks leads to the interference becoming extremely complex, which makes it’s hard to use traditional methods to evaluate the system performance of D2D technology in multi-cell scenarios. Besides, traditional methods always model cellular networks by placing the base station on a hexagon or a grid, which are highly idealized and not very tractable. In order to evaluate system performance, complex system-level simulations are used in traditional models. In this work, we adopt the Spatial Poisson Point Process (SPPP) to build a tractable model for heterogeneous network to analyze and derive the closed-form expressions for the performance of single-hop D2D communication and cooperative D2D communication, respectively. The work in this thesis provides an efficient solution to analyze the system performance of D2D heterogeneous network.In order to mitigate the interference in the single-hop D2D communication scenario, Exclusion Regions (ERs) are employed to limit the locations of CUEs (Cellular Users Equipment) and DUEs (D2D Users Equipment). Analytical expressions of coverage probability and area spectrum efficiency are also derived. Numerical results demonstrate that ERs could significantly improve the coverage probability and the system area spectral efficiency. Furthermore, the relationship between the radius of ERs, the maximum D2D communication distance and the D2D density are also investigated in this thesis.In the cooperative D2D communication scenario, we propose three location-aware relay selection schemes and derive the analytical expressions of coverage probability of each scheme. The transmission capacity and energy efficiency of each relay selection scheme are also analyzed with a relay-discovery mechanism. Numerical results reveal that, even though All Relays Selection scheme provides the best coverage probability, Distance-based Relays Selection is the best scheme in terms of both transmission capacity and energy efficiency by considering the signaling overheads.