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首页 > 过刊浏览>2018年第27卷第9期 >130-136. DOI:10.15888/j.cnki.csa.006540
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改进的VANET分布式自适应时分多址分配机制
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国家自然科学基金（61571128）


Modified Distributed Adaptive TDMA Scheduling Mechanism for VANET
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    摘要:

    在车载自组织网（Vehicular Ad-hoc Network，VANET）环境下，针对多节点同时接入信道时的竞争冲突问题，将分布式时分多址（Time Division Multiple Access，TDMA）和空分多址（Space Division Multiple Access，SDMA）思想相结合，提出改进的分布式自适应时分多址分配机制（Modified Decentralized Adaptive TDMA Scheduling mechanism，MDATS）.MDATS协议的节点通过帧信息（Frame Information，FI）的交互，获取两跳范围内其他节点时隙使用情况，从而筛选出空闲时隙集.竞争区域将根据空闲时隙数在空间上均分成多个逻辑区段，节点则根据所处的逻辑区段与空闲时隙的对应关系确定竞争使用的时隙.该协议通过对空闲时隙在空间上的分散化，降低同时接入节点之间的竞争冲突.仿真结果表明，MDATS协议与其他类似MAC协议相比，能够达到更高的信道接入成功率、更低的接入时延性能以及更高的时隙利用率.

    Abstract:

    In Vehicular Ad-hoc NETwork (VANET), a Modified Decentralized Adaptive Time Division Multiple Access (TDMA) Scheduling mechanism (MDATS) is proposed by combining distributed TDMA and Space Division Multiple Access (SDMA) in order to solve the problem of contention collision when multiple nodes access channels simultaneously. The nodes with MDATS protocol, obtain the time slot allocation of two-hop neighbors through Frame Information (FI), which can determine the available time slot set. Then, the competition zone will be divided into several logical sections based on the number of available time slots. The nodes competitively select their time slots based on the mapping between the logical sections and the available time slots. This protocol reduces the contention collision among the nodes which access the channel simultaneously by the spatial dispersion of the available time slots. The simulation results show that MDATS protocol can achieve higher channel access success rate, lower access delay, and higher time slot utilization rate when it is compared with other similar MAC protocol.

    参考文献
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王梦雪,徐哲鑫,吴怡,林潇.改进的VANET分布式自适应时分多址分配机制.计算机系统应用,2018,27(9):130-136

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  • 收稿日期:2018-01-17
  • 最后修改日期:2018-02-09
  • 在线发布日期: 2018-08-17
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