蜂巢式網路下裝置對裝置通訊避免干擾方法之研究

Abstract

近年來，由於行動裝置的普及，使得無線通訊網路的資料流量日趨漸增，然而過度龐大的資料流量勢必造成無線通訊網路的負擔。如何增加資料速率(Data Rates)、或是增加無線通訊網路的系統容量(System Capacity)，儼然成為次世代無線通訊系統的重要議題。因此，裝置對裝置通訊系統(D2D Communication System)的技術被提出來，由於它能讓用戶端裝置彼此進行直接通訊而不需經由基地台(Base Station)，因此帶來一些優點，包括吞吐量的提升、頻譜使用效率的提升、以及節省用戶端裝置的功率等。雖然裝置間可以直接通訊，我們仍然可以透過協定使得基地台能控制通道資源。

在本文中，我們提出一個在蜂巢式網路控制下的裝置對裝置通訊避免干擾的方法，主要的內容包含：資源分配(Resource Allocation)、同儕裝置發現(Peer Discovery)、裝置功率控制(Power Control)。裝置對裝置的使用者藉由重複使用蜂巢式網路的上行(Uplink)通道資源使得整體網路的系統容量得以提升。

In recent years, cellular networks encounter huge volume of traffic due to more and more mobile devices and multimedia applications joining in the cellular networks. How to increase data rate or throughput is an important issue in next generation cellular system. Hence, the concept of cellular-controlled direct communication named device-to-device (D2D) communication was proposed. Because user equipment (UE) can directly communicate with its peer device, D2D has a lot of advantages such as cell throughput enhancement, spectral efficiency increasing, UE power saving, and so on. Although in D2D UEs can directly communicate with each other, they remain under control of the base station (BS) through a well-designed protocol.

In this thesis, we propose an interference avoidance method for D2D communication system in a cellular network. Our main subjects include both resource allocation, peer discovery, and power control. D2D UE can directly communicate with peer device through the control of the base station. Cellular-controlled D2D communication will enhance overall cell throughput because D2D UEs reuse cellular uplink channel resources.