基于IEEE 802.11p的自适应主次窗口退避机制及验证

doi:10.19562/j.chinasae.qcgc.2022.12.007

Abstract

Abstract:

In traffic intensive scenarios， the existing DSRC and C-V2X technologies can not ensure efficient data transmission. Firstly， this paper introduces the network architecture of the Internet of vehicles. Secondly， the design of an IEEE 802.11p mechanism based on adaptive primary and secondary window partition is proposed， in order to reduce the collision rate of vehicle nodes and then increase the data transmission rate. Then， by establishing a two-dimensional Markov model， analytical expressions of transmission delay and other performance indexes are obtained. Finally， the improved mechanism is numerically verified. The simulation results show that compared with the classical mechanism， the improved mechanism can obtain better network performance in both sparse and dense traffic scenes. At the same time， a multi-objective optimization model with minimum delay and highest reliability is established to optimize the proposed mechanism so as to obtain balanced system performance.

Key words: primary and secondary backoff windows, IEEE 802.11p, adaptive, Markov model, multi objective optimization

Xingkai Zhou,Zufang Dou,Xijuan Yang,Qiaoli Yang. Backoff Mechanism and Verification of Adaptive Primary and Secondary Windows Based on IEEE 802.11p[J].Automotive Engineering, 2022, 44(12): 1856-1865.

Figures/Tables 12

符号	含义
$B i, j$	$B l o c k ? B (i, j)$ 状态
$P t r a n s$	每个数据包传输的稳态概率
$P B i, j$	进入 $B l o c k ? B (i, j)$ 的稳态概率
$P b a c k i, j$	退避状态的稳态概率
$P C C A i, j$ $P S P B i, j$	CCA状态的稳态概率 $B l o c k ? B (i, j)$ 的稳态概率之和
$B P$	主退避占退避过程的份数
$L$	传输数据包的等效时间
$N$	车辆节点的个数
$P C$	节点间冲突发生的稳态概率
$α$	信道占用的稳态概率
$τ$	决定发送数据包的稳态概率
$m$	$m a c M a x C S M A B a c k o f f s$

参数	数值
数据长度	120 bytes
传输速率	250 kbps
传输数据包的等效时间 $L$ 车辆密度 $N$	12（3.84 ms） 0-36
最大退避次数（ $m a c M a x C S M A B a c k o f f s$ ）最小退避次数（ $m a c M i n C S M A B a c k o f f s$ ）	5 1
最大退避指数（ $m a c M a x B E$ ）	6
最小退避指数（ $m a c M i n B E$ ）分布式帧间间隙（ $D I F S$ ）短帧间间隙（ $S I F S$ ）	3 58 μs 32 μs
最大竞争窗口尺寸 $W m a x$ 最小竞争窗口尺寸 $W m i n$	63 7

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Backoff Mechanism and Verification of Adaptive Primary and Secondary Windows Based on IEEE 802.11p

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