Ad hoc网络中信号干扰对DCF协议公平性的影响及仿真分析  

Analysis and Simulation of Signal Interference Effect on DCF Fairness in Ad Hoc Networks

作　　者：雷磊[1] 许宗泽[1] 冯欣欣[1] 

机构地区：[1]南京航空航天大学信息科学与技术学院,南京210016

出　　处：《系统仿真学报》2010年第1期165-169,共5页Journal of System Simulation

基　　金：航空科学基金资助项目(20090152001);江苏省产学研前瞻性联合研究资助项目(BY2009100);南京航空航天大学科研启动基金资助项目(S0918-042)

摘　　要：将ad hoc网络中的信号干扰划分为传输干扰和载波干扰两大类,并完整的分析了这两类信号干扰对DCF协议公平性的影响。发现当所有发送节点都在彼此的物理载波检测范围之内时,物理载波检测机制能为发送节点提供一种同步机制,从而有效保证多对收/发节点公平的共享信道带宽;而当部分发送节点不在其余发送节点的物理载波检测范围之内时,载波干扰则会严重破坏DCF协议的公平性,信号干扰引起的冲突甚至还会导致信道被某些收/发节点垄断,出现极端不公平现象。The signal interference was divided into two parts, transmission interference and carrier interference, and the impact of signal interference on the DCF fairness was investigated in detail. Considering there are multi-pairs of receivers and transmitters in the network, if the transmitters are all in the other＇s physical carrier sensing range, the physical carrier-sense mechanism can provide a synchronization mechanism, thus guarantee the fairness for DCF protocol. However, if some of the transmitters are out of the other＇s physical carrier sensing range, the DCF protocol may suffer from a serious fairness problem because of the carrier interference. Even worse, some pairs of receivers and transmitters will capture the channel because of the collision caused by the signal interference, leading to the extreme unfairness.

关 键 词：AD HOC网络 DCF公平性 信号干扰 载波检测 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]