功率控制應用於免執照LTE小細胞與WiFi共存系統之研究

Abstract

為了滿足未來爆炸性成長的流量，長期演進系統將運用在免執照頻譜的5GHz頻帶上。在本篇論文中，研究功率控制應用於免執照LTE與WiFi共存系統的問題，我們提出一種適應性注水演算法，為了最大化免執照LTE小細胞的吞吐量同時能保證WiFi的吞吐量。而主要的貢獻在於根據通道資訊和已知的WiFi資訊來獲得小細胞最佳的傳輸功率和傳輸時間。在模擬結果中，和傳統的方法比較，提出的演算法有較佳的效能和較低的複雜度。

Long Term Evolution (LTE) systems will apply on unlicensed spectrum of 5GHz band, to meet explosive growth of traffic volume in the future. In this paper, the power control problem is studied for LTE-U and WiFi coexisting system. We present an adaptive water-filling algorithm to maximize LTE-U throughput while guaranteeing WiFi throughput. The main contribution is to provide a methodology to obtain optimal transmit power and transmission time of LTE-U small cells according to channel state information and WiFi information. Simulation results show the proposed algorithm has better throughput performance and lower complexity.