摘要
由于天线半双工的工作方式和信号空间传播的复杂性,无线网络相对于有线网络更易发生冲突,这个问题在物理层难以解决。IEEE 802.11在MAC层通过使用虚拟载波监听技术解决了这个问题。IEEE 802.11 MAC在CSMA/CA的基础上提供了确认帧ACK,保证了MAC层对帧丢失给予检测并重新发送。为了进一步避免碰撞,解决"隐藏终端"问题,又加入了RTS/CTS+ACK协议。本文对于这种基于RTS/CTS的虚拟载波侦听的工作方式原理做了探究,并通过软件模拟了其实现过程。
Because of the antenna＇s half-duplex way of working and the complexity of signal space transmission, as compared with the wired network,wireless network is more likely to have conflicts,which is difficult to solve in physicality.IEEE 802.11 can solve the problem by using virtual carrier sense technology on MAC.On the basis of CSMA/CA,IEEE 802.11 MAC provides ACK confirmation.To avoid further collision and solve the＂hidden terminal＂,the RTS/CTS ＋ ACK agreement has been reached.This paper probes into the working principle of virtual carrier sense based on the RTS/CTS,exploring its implementation process through software simulateion.
出处
《浙江工商职业技术学院学报》
2010年第4期89-92,共4页
Journal of Zhejiang Business Technology Institute
关键词
载波侦听算法
无线网络
冲突
碰撞
carrier interception algorithm
wireless network
conflict
collision
