A Study on Power Control for DCF Basic Access in Dense Small Cells
Date Issued
2014
Date
2014
Author(s)
Hsu, Chin-Wei
Abstract
Due to the rapid development of Wi-Fi networks based on the IEEE 802.11 standards, almost every household has installed at least one Wi-Fi access point(AP). Although dense deployment of APs provides high coverage of wireless networks, high power level of signal from neighbor APs causes many problems including interference and hidden terminals resulted from the contention-based distributed coordinated function (DCF) used by 802.11. Therefore, the collaborative mechanisms between APs will be one of important methods to improve the performance of wireless network and power control will especially be key technique to solve these problems. Although there are many researches discussing about power control model, they do not consider the behavior of DCF. In this thesis, we first analyze the characteristics of DCF and model successful transmission for DCF including three steps: accessing channel, data reception, and ACK reception. We define different sets which can accurately represent the interaction and influence between APs for three steps during transmission. Based on the model of successful transmission for DCF, we find that power setting indeed influences the performance of 802.11 network and we propose power control design. The simulation results show that proposed power control design outperform other models for not only probability of successful transmission but also fairness of network. From microscopic view of simulation results, we find that traditional models suffer from problems of hidden terminal and high interference. For our proposed design, these problems can be solved effectively because we consider and analyze the characteristics of DCF precisely.
Subjects
802.11基地台
高密度佈建
功率控制最佳化設計
Type
thesis
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