通信学报 ›› 2016, Vol. 37 ›› Issue (4): 74-86.doi: 10.11959/j.issn.1000-436x.2016074

• 学术论文 • 上一篇    下一篇

基于协议序列平均分配算法的VANET信道接入机制

徐哲鑫,蔡苓玲,林潇,吴怡   

  1. 福建师范大学光电与信息工程学院,福建 福州350007
  • 出版日期:2016-04-25 发布日期:2016-04-26
  • 基金资助:
    国家自然科学基金资助项目;教育部高等学校博士学科点专项科研(新教师类)基金资助项目;福建省自然科学基金资助项目;福建省科技厅工业科技计划重点基金资助项目

Channel access mechanism based on equally allocation of protocol sequence for VANET

Zhe-xin XU,Ling-ling CAI,Xiao LIN,Yi WU   

  1. College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350007, China
  • Online:2016-04-25 Published:2016-04-26
  • Supported by:
    The National Natural Science Foundation of China;The Research Fund for the Doctoral Program of Higher Education of China;The Natural Science Foundation of Fujian Province;The Key Projects of Science and Technology Plan for Industry of the Science and Technology Department of Fujian Province

摘要:

为了提高VANET 中节点的吞吐量性能,提出基于协议序列平均分配算法的信道接入机制。在高速公路场景下,规划IEEE 802.11p业务信道与竞争区段的映射,并根据用户保障序列的特性设计帧结构。通过少量反馈确定竞争区段的节点数,并提出循环轮流分配法实现平均意义上非整数个序列的分配。仿真结果证明了理论分析的有效性,在实际路况中均分法与经典方法相比吞吐量性能明显改善,并且节点越稀疏、物理层数据传输速率越高,吞吐量性能提升越明显,同时可保持较低的网络开销和较好的信道接入公平性。

关键词: 车载自组织网, 全球导航卫星系统, 平均分配, 信道接入, IEEE802.11p

Abstract:

In order to improve the throughput performance in VANET, a channel access mechanism based on equally al-location (EA) of protocol sequence was proposed. For highway scenery, the proposed mechanism re-planed the mapping of traffic channel allocation of IEEE 802.11p to competition zone. In addition, the frame structure was also redesigned according to the characteristic of user irrepressible protocol sequence. A few bits of data were used to find out the number of nodes in the competition zone. Cyclic polling allocation was proposed to allocate the protocol sequences under average meaning. The theoretical throughput expression is derived and proved to be correct by simulation. It is also verified that the throughput of EA is more superior to classical met in a sparser distributed network or a higher PHY data rate. Equally importantly, EA can also keep relative low net overhead and available fairness about channel access of the nodes.

Key words: vehicular ad hoc networks (VANET), global navigation satellite systems (GNSS), equally allocation, channel access, IEEE 802.11p

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