毫米波蜂巢式通訊系統干擾協調與資源分配

Abstract

基於近幾年新的量測結果和大量可用頻帶，毫米波做為未來第五代移動通訊系統的趨勢已越發明顯。目前大部分對於毫米波的研究都還處於新通道的模型化，以及如何在移動中提高連接穩定性的階段，媒體接取層的研究甚少。本篇論文主要著墨於毫米波蜂巢式系統下，媒體接取層如何處理不同基地台間會存在的干擾。毫米波的基地台由於指向性很強，可以利用這個特性達到更高的空間及頻率重複使用效果。但也由於指向性的特性，會對鄰近特定用戶造成一定干擾，而此種干擾性質又與LTE很不同。因此我們提出了一個可以讓鄰近基地台做某種程度的合作，來達到消除干擾又同時保持空間重複使用的效果。

Based on the recent measurement results in NYU (New York University), people start to reconsider the possibility of using mmWave as the 5G cellular system. The intriguing huge available bandwidth in mmWave frequency also contribute this trend. Most research in mmWave cellular field focus on the antenna beamforming and the beam tracking stability due to the directional characteristic. Few people are studying mac layer design or the interference problem, which they think should be a minor problem compare to LTE. This article will focus on the mac layer design that can deal with the inter-cell interference at the same time. Due to the directional feature, spatial reuse and frequency reuse can be improved. However, this feature also leads to strong signal at specific direction which can cause interference, which would be rather different from that of LTE. We proposed a mechanism that can allow some cooperation between adjacent cells. In this way, we are able to eliminate interference and at the same time preserve the high spatial reuse feature of mmWave signal.