在蜂巢網路下之Device-to-Device通訊上行頻帶部分頻率重複使用區域

Abstract

在本論文中所探討的主題為蜂巢網路(cellular networks)下之Device-to-Device通訊(D2D communication)上行頻帶部分頻率重複使用(fractional frequency reusing scheme)區域的研究。由於D2D用戶設備重複使用蜂巢式網路用戶設備(cellular user equipment)的資源，細胞間的干擾(inter-cell interference)問題就是一個很重要的議題，為了減緩來自鄰近細胞網路的干擾來達到最小訊號與干擾加雜訊比(SINR)，我們將探討D2D通訊的頻率重複使用區域的影響。本篇論文也採用LTE-A功率控制方法，使其在傳輸能量與覆蓋範圍中取得一個適當的平衡，也藉此控制對其他使用者使用相同資源的干擾問題。從模擬結果來看，本論文所提出的D2D使用者頻率重複使用區域能改善平均的訊號與干擾加雜訊比與系統吞吐量，也減少了能量的浪費。

In this thesis, the system performances of a fractional frequency reusing (FFR) scheme for Device-to-Device (D2D) communication in uplink underlaying cellular networks is studied. Since D2D user equipments (DUEs) reuse the frequency band of cellular user equipments (CUEs), the inter-cell interference (ICI) is an important issue to be investigated. To mitigate the interference from CUEs in adjacent regions or cells, the frequency reusing regions for DUEs is studied in order to achieve the minimum signal-to-interference-plus-noise ratio (SINR) requirement. The power control scheme for LTE-A uplink is also introduced to keep a balance between transmission power and coverage as well as the interference to other users using the same resources. Simulation results show that by applying the proposed frequency reusing region for DUEs, not only the average SINR and throughput is improved but also power wastage is reduced.