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采用TDMA和CSMA混合MAC协议的时隙调整算法
张延年,吴昊,李海鹏
0
(南京交通职业技术学院 电子信息工程学院,南京 211188;吉林大学 通信工程学院,长春132002)
摘要:
由于车联网(VANET)拓扑动态变化,车辆高速移动以及不同服务质量要求,制定媒体接入控制(MAC)协议面临巨大挑战。在控制信道间隔内采用基于TDMA和CSMA的混合接入协议是最有效的MAC协议之一。基于TDMA和CSMA的混合MAC协议(T-C-MAC)能够依据车辆环境调整TDMA帧长度,并能有效地传输非安全消息。为了提高T-C-MAC协议的性能,提出了一种基于三跳邻居信息的时隙调整(THSA) 算法。通过有效地调整车辆传输时隙,基于THSA的MAC(THSA-MAC)协议能够有效地实施广播服务,提高了安全消息传输率。实验数据表明,THSA-MAC有效地提高了安全消息传递率。
关键词:  车联网;时隙调整;时分多址接入;载波监听的多址接入  三跳邻居
DOI:
基金项目:国家自然科学基金资助项目(41172294)
A slot adjustment algorithm for hybrid MAC based on TDMA and CSMA
ZHANG Yannian,WU Hao,LI Haipeng
(School of Electronic and Information Engineering,Nanjing Communications Institute of Technology,Nanjing 211188,China;College of Communication Engineering,Jilin University,Changchun 132002,China)
Abstract:
Due to dynamic topology,high mobility and different quality of service,designing Media Access Control(MAC) protocol for vehicle ad hoc networks(VANETs) is a challenging work.One promising approach is to employ both Time-Division Multiple Access(TDMA) and Carrier Sense Multiple Access(CSMA) hybrid access schemes in the control channel interval.These protocols can adjust the length of TDMA frame(also called broadcast frame) in order to adapt itself to different vehicle conditions and provide efficient non-safety message transmission.To improve the efficiency of the hybrid MAC mechanism in VANETs,a three-hop slot adjustment algorithm called THSA is proposed.By adjusting the slot quickly,MAC protocol using THSA can support efficient broadcast services.Simulation results show that the hybrid MAC protocol using THSA can provide faster broadcast frame adjustment and higher packet delivery ratio of safety packets on the control channel than using the existing algorithms.
Key words:  vehicle ad hoc network(VANET)  slot adjustment  time-division multiple access  carrier sense multiple access  three-hop neighbor
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