基於競爭窗口的LTE在未授權頻譜設計;Contention window based design for LTE in unlicensed spectrum

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Computer Science and Information Engineering > Electronic Thesis & Dissertation > Item 987654321/74705

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/74705

Title:	基於競爭窗口的LTE在未授權頻譜設計;Contention window based design for LTE in unlicensed spectrum
Authors:	劉岳昕;Liu, Yuen-Xin
Contributors:	資訊工程學系
Keywords:	LTE-U;Wi-Fi;免執照頻段;競爭視窗;占空比;LTE-U;Wi-Fi;Unlicensed Spectrum;Contention Window;Duty Cycle
Date:	2017-08-04
Issue Date:	2017-10-27 14:36:50 (UTC+8)
Publisher:	國立中央大學
Abstract:	為了滿足日漸增長流量需求，行動網路營運商將免執照頻段引入到LTE中，使其得到更大的頻寬。但若沒有公平的共存方法，將會嚴重危害目前在免執照頻段中Wi-Fi的效能。在本篇論文，我們提出一套利用Wi-Fi競爭視窗大小來分配占空比的共存方法。我們在LTE基地台中安裝虛擬Wi-Fi傳送節點，利用該節點來模擬分散式協調功能，得到目前網路中競爭視窗大小，根據平均競爭視窗大小估算目前Wi-Fi網路的流量，分配合適的占空比。我們提出的共存方法可以保證Wi-Fi與LTE之間的公平性，並提高頻譜使用效率。最後，我們利用NS3這套模擬軟體去評估我們與其他共存方法的效能。;In order to satisfy increasing traffic demands, LTE-U offloads its traffic on unlicensed channels by aggregating its licensed and unlicensed carriers. However, coexistence of LTE-U and unlicensed users such as WiFi causes significant interference, which degrades the throughput of WiFi systems. In this paper, we propose fair coexistence scheme that allocates LTE-off period (i.e., time for WiFi transmissions) according to Wi-Fi traffic volume. We can estimate Wi-Fi traffic level based on average contention window size. Simulation results show that our coexistence scheme outperforms state-of-the-art techniques in terms of fairness.
Appears in Collections:	[Graduate Institute of Computer Science and Information Engineering] Electronic Thesis & Dissertation

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