摘要
无线局域网(Wireless LAN, WLAN),是一种利用无线媒介,提供无线对等和点到点连接的数据通信系统。当前存在多种无线局域网标准,而IEEE 802.11标准是其中应用最广泛的无线局域网协议。
IEEE 802.11无线局域网MAC层协议有两种基本接入方式—DCF和PCF。本论文主要对基于CSMA/CA的DCF方式进行了系统、深入的分析,重点研究了其中的载波侦听、随机退避机制、信道访问机制等技术。根据模块化程序设计思想,将整个协议功能分成了五个功能模块,详细介绍了其中三个协议模块的功能,并具体设计了这三个模块的程序。然后在用软件编程实现MAC层协议的基础上搭建了协议实现的软硬件平台,实现了嵌入式操作系统μC/OS-II在ARM7处理器上的移植。最后论文介绍了基于协同通信思想的MAC层协议—CMAC(Cooperative Communication MAC)协议。
The wireless local area network(Wireless LAN,WLAN), is a data communication system to provide the connection point to point and equal entity to equal entity through wireless medium. At present there are many kinds of WLAN standard, thereinto IEEE 802.11 standard is used most widely.
The WLAN protocol IEEE 802.11 has two kinds of basic access ways - DCF(distributional coordination control function) and PCF(centralism coordination control function). In the thesis, we have a systematical and thorough analysis on DCF which based on CSMA/CA(carry sense detected of multiple access of collision avoid) technology and study the carrier sense, random backoff mechanism, channel access control etc. According to the modular design process, we design the MAC layer protocol software, divide the entire protocol function into five function modules, introduce the function of three blocks of them in detail, and design the specific program of three blocks.And then, we build the hardware and software platform for the realization of the protocol based on the achievement of MAC layer protocol through software programming, accomplish the transplant of the embedded operating systemμC/OS-II in the ARM7 processor as a MAC protocol software running environment. Finally, we describe a new MAC layer protocol based on cooperative communication -CMAC (Cooperative Communication MAC) protocol.
引文
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