中文摘要：

目前大多数针对WLAN—Mesh网络中MAC协议公平性问题的分析都是在纯计算机仿真的结果上开展的．然而，纯计算机仿真软件中的模型往往与实际的网络存在偏差，从而导致其仿真结果的可信度较差。半实物仿真（hardware in loop simulation）是一种将网络中非线性、随机性较大的因素用实际的网络设备加载，其余部分则在仿真中建模的新型仿真方法．本文旨在利用半实物仿真平台研究WLAN—Mesh网络中MAC协议公平性问题．首先针对传统纯计算机仿真结果的局限性进行了探讨．接着，利用自行研制的实际业务流终端构建了基于EXata的半实物网络仿真系统．最后，结合不同网络环境下的半实物仿真结果，对wLAN—Mesh网络中MAC协议的公平性问题做了详细的分析．

英文摘要：

Abstraet：WLAN Mesh networks employing the IEEE 802.11 Distributed Coordination Function { DCF ） scheme as a basic Medium Access Control （ MAC } protocol have been shown to suffer from serious throughput unfairness among competing flows. For analyzing the MAC fairness in WLAN-Mesh Networks, computer simulation is mostly preferred by researchers. However, since there exists de- viation between computer software models and real network environment, the simulation results may be biased away the true, thus, decreasing their credibility. The hardware in loop simulation is a kind of simulation technique which incorporates actual network de- vices with traditional computer simulations. Due to its obvious advantages, more and more network researchers pay attention to this kind of simulation technique. This paper aims to analyze the MAC fairness in WLAN-Mesh Networks by means of the hardware in loop network simulation system. Firstly, the limitation of computer simulation and analysis of MAC fairness in WLAN-Mesh Net- works is pointed out. Secondly, the hardware in loop network simulation system based on EXata is built with self-developed commu- nication terminals. Finally, simulations in different network environment are carded out, and a detailed analysis of MAC fairness in WLAN-Mesh Networks based on the results is given. Key words： WLAN-Mesh networks ; MAC protocol ; fairness ; hardware in loop simulation