认知车载网中基于TDMA/CSMA的混合多信道MAC协议研究  

Research on hybrid multichannel MAC protocol based on TDMA/CSMA in CR-VANET

作　　者：金喜龙 章国安[1] 叶翔[1] 成峰 Jin Xilong;Zhang Guo’an;Ye Xiang;Cheng Feng(School of Electronics&Information,Nantong University,Nantong Jiangsu 226019,China)

机构地区：[1]南通大学电子信息学院,江苏南通226019

出　　处：《计算机应用研究》2018年第3期874-878,共5页Application Research of Computers

基　　金：国家自然科学基金资助项目(61371113;61401241)

摘　　要：针对MAC协议在很大程度上影响着车载移动环境的吞吐量、丢包率和传输时延等性能,基于认知车载网中MAC协议的要求,提出了一种TDMA与CSMA相结合的多信道MAC协议(CRTC-MAC)。在固定时隙分配时采用基于无竞争的TDMA访问策略,在动态时隙分配时采用基于竞争的CSMA接入方案,并在此基础之上对传统的TDMA和CSMA访问方式进行了改进,通过优化数据传输的帧结构,减小了冗余数据所带来的额外开销。性能分析和仿真结果表明,CRTC-MAC协议在上述性能指标上,表现出了一定的优越性。该协议能有效降低节点间数据包传输时所产生的碰撞,在较少的帧数内保障节点成功获取到相应的时隙,从而改善网络的性能。Considering the large effect of MAC protocol on network performance such as throughput,packet drop rate and transmission delay,this paper developed a new multichannel MAC algorithm CRTC-MAC based on the requirements of the CR-VANET and it combined the fixed TDMA and dynamic CSMA method.The algorithm applied TDMA method when it was in fixed time-slot allocation while it utilized CSMA method when it was in dynamic time-slot allocation.Then,this paper proposed a better architecture of TDMA and CSMA based on traditional protocol to adapt the new multiple access algorithm.By optimizing the frame structure,it could reduce the extra cost which is caused by redundant data.Performance analysis and simulation results show that CRTC-MAC show certain advantages in aforementioned performance indicators.This protocol has smaller collision probability between packet of nodes and these nodes can successfully obtain their corresponding slots in few frames,thus it can improve the network performance.

关 键 词：认知无线电 车载自组网 介质访问控制 时分多址 载波侦听多路访问 

分 类 号：TN929.5[电子电信—通信与信息系统]