[1]张旭[] [],田锦[]. IEEE 802.11p MAC协议碰撞概率研究与分析[J].计算机技术与发展,2017,27(03):12-17.
　ZHANG Xu[] [],TIAN Jin[]. Investigation and Analysis on Collision Probability of IEEE 802 . 11p MAC[J].,2017,27(03):12-17.
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 IEEE 802.11p MAC协议碰撞概率研究与分析()
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《计算机技术与发展》[ISSN:1006-6977/CN:61-1281/TN]

卷:
27
期数:
2017年03期
页码:
12-17
栏目:
智能、算法、系统工程
出版日期:
2017-03-10

文章信息/Info

Title:
 Investigation and Analysis on Collision Probability of IEEE 802 . 11p MAC
文章编号:
1673-629X（2017)03-0012-06
作者:
 张旭[1] [2]; 田锦[2]
 1.河海大学 物联网工程学院；2.金陵科技学院 网络与通信工程学院
Author(s):
 ZHANG Xu[1] [2]; TIAN Jin[2]
关键词:
 ; IEEE802.11p ; EDCA ; 优先级; 碰撞概率
Keywords:
 ; IEEE 802. 11p; EDCA; priorities; collision probability
分类号:
TP31
文献标志码:
A
摘要:
 车载网络MAC层采用的是IEEE 802.11p/1609.x协议,现有的无线通信MAC协议无法满足交通信息化产业的需求.目前针对IEEE 802.11p MAC层的研究主要是通过设计马尔可夫模型进行的,但该模型建模复杂,计算难度大.文中设计了一个简化直观的数学模型对该协议进行研究与分析,阐述了IEEE 802.11p MAC层中的EDCA信道接入规范,根据EDCA的信道接入规范设计一个简化的数学分析模型.在不考虑仲裁帧间隙(AIFS)的前提下,运用该模型对EDCA竞争传输机制中四个不同优先级发生第一次传输情况下的碰撞概率进行研究.主要分析了不同优先级的不同竞争窗参数以及节点数目对于系统碰撞概率的影响.根据各个优先级的节点数目情况,运用该模型合理设计相应竞争窗的取值,显著提高了系统的性能.分析结果表明:该模型在研究IEEE 802.11p MAC层性能中有较好的表现.
Abstract:
 The MAC layer of VANET adopts the IEEE 802. 11p/1609. x protocol,and the existing MAC protocol of wireless communica-tion cannot meet the demand of the industry of traffic informatization. The study of IEEE 802. 11p MAC is mainly through designing Markov chain model,but it is complex and difficult to calculate. Therefore,a intuitional mathematical model has been designed to research and analyze the mechanism. According to mechanisms of EDCA and on the basis of investigation on EDCA standard,a simplified mathe-matical analysis model has been designed to analyze the competitive transmission mechanism in EDCA. The investigation focuses on the collision probability of four different priorities in EDCA without consideration of the Arbitration Inter Frame Space ( AIFS) . The analysis on channel access with more nodes with the proposed model have been conducted after setting parameters of the contention windows of different priorities. The collision probabilities can be reduced and thus the quality of system be improved. Simulation results show that this model has better performance in construction research on the MAC Layer of IEEE 802. 11p.

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更新日期/Last Update: 2017-05-12