基于竞争式MAC接入的移动Ad hoc网络建模与仿真

摘要

总结了具有代表性的竞争式MAC接入协议：冲突避免多址接入MACA、IEEE 802.11 DCF和信道获得多址接入FAMA传输介质访问控制接入的一般性规律，建立了一个竞争式MAC接入数学模型，研究哪些因素影响网络通信。通过NS2网络模拟实验，验证了这些影响的存在，并初步了解如何减少这些负面影响。与无线网络物理层或高层网络比起来，MAC接入对于无线网络高效可靠通信的负面影响容易被忽略，实际却存在，该研究对无线网络可靠通信具有一定参考价值。%A contention MAC access model is built by concluding general rules of representive contention MAC access protocols: Multiple Access Collision Avoidance,IEEE 802.11 DCF and Floor Acquisition Multiple Access. The factors influencing the networks communication are studied by the model. These negative influences existence are tested by networks simulation. The pilot method reducing these is acquired on NS2. MAC access bad effects on wireless networks high effeciency and reliability are easily ignored but indeed existed compared with physical layer and higher layer than MAC layer. So the study has some reference to the wireless networks reliable communication.