對於具有同時傳送的裝置對裝置通訊系統和速率的增強

Abstract

裝置對裝置(D2D)通訊是長期演進技術升級版(LTE-A）的技術，裝置對裝置可以再傳統的頻段上直接建立連線，裝置對裝置有著物理上近距離傳出的特性，因此會帶來高的傳輸速率、低延遲、低功率消耗等優點。然而，如果D2D與傳統的使用裝置在同一個資源塊下進行同時傳輸，共同通道的干擾將會發生，D2D會造成原系統網路傳輸表現上嚴重影響，且D2D的傳送也幾乎會失敗。因此我們提出使用髒紙編碼(DPC)來解決此問題，使用髒紙編碼可以消除傳統使用裝置對於裝置對裝置通訊接收端的干擾。我們也提出排程演算法與動態的功率分配方法來改善上傳系統的表現。藉由模擬，我們展示出所提的方法可以改善整體通訊系統的表現。

Device-to-Device (D2D) communication is a technology component for LTE-A. D2D would enable the direct communication of a device to another device using the cellular spectrum. D2D takes advantage of the physical proximity of communication devices, for example, high bit rate, slow delays, low power consumption, etc. However, if D2D and cellular user equipments (UEs) transmit in the same radio resource block (RB), co-channel interference will occur, which may decrease performance of cellular networks, and D2D will most likely fail. Therefore, we propose a precoding mechanism which uses the dirty paper paper (DPC) to remove the interference from cellular UE to D2D UE. We also propose scheduling algorithm and dynamic power allocation mechanism to improve performance of UL systems. By simulations, we show that the proposed mechanisms can improve performance of the entire communication systems.