文档介绍：湖北工业大学
硕士学位论文
IEEE
姓名:张志
申请学位级别:硕士
专业:计算机应用技术
指导教师:张颖江
20100501
湖北工业大学硕士学位论文
摘要
由于无线局域网具有使用便捷,组网方式简单,以及可靠性高等特点,因此近
年来无线局域网技术和应用得到了迅猛的发展。无线局域网被看作传统有线网络
的延伸,在某些环境还可以替代传统的有线网络,伴随着无线局域网技术的发展,
孕育而生的无线局域网的各种应用也走进了人们的日常生活并迅速普及,然而,
由于无线局域网业务,如语音业务,视频业务等的爆发式增长,对无线局域网的性
能提出了更高的要求,因此,如何提高无线局域网的服务质量已经成为当下研究
无线局域网的热点和难点。基于此,本文较为详细的分析了针对网络
服务质量的协议的性能和特点,通过采用动态调整竞争窗口大小的
方式来提高业务吞吐量并降低传输时延,改善无线局域网的服务质量。
文章介绍了的工作原理机制,重点分析了 DCF 和 PCF 的信道访问
方式,针对以上方式的接入特点指出了其在网络服务质量保障上存在的缺点,然
后通过将和能够提高优先级服务的协议接入信道方式的
对比,阐述了协议更能满足业务的 QoS 需求,同时也对
协议的不足进行说明,最后针对协议的不足提出了基于网络负载情
况的动态调整竞争窗口大小的研究方案,在 NS 仿真环境下,添加了
协议,对该协议在 NS 中实现的过程做了相关的说明,并将仿真结果与已有的方案
进行了对比,通过数据分析得出本方案在对多媒体业务的吞吐量和延时方面的性
能确实有改善,也得到了预期的方案效果。

关键词: ,服务质量,竞争窗口,加权轮询,网络仿真
I
湖北工业大学硕士学位论文
Abstract
As wireless local work with easy to use, simple working Method, as
well as high reliability, so in recent years, wireless local work technology and
applications has seen rapid development.
Wireless LAN is seen as an extension of traditional works, in some
environments can also be an alternative to traditional works, along with
wireless LAN technology, breeding and health of the wireless LAN applications have
also entered the people's daily lives and The rapidly growing popularity, however, due
to the wireless LAN services, such as voice services, video services such as the
explosive growth of wireless LAN performance, put forward higher requirements,
therefore, how to improve the quality of service the wireless LAN has e a
contemporary study of wireless LAN hot spots and difficult. For this
reason, this more detailed analysis of the quality of service work
protocol performance and characteristics petition through the use of dynamically
adjusting the window size of the ways to improve business throughput and reduce
transm