VANET中基于碰撞概率和过期概率的自适应退避算法研究

doi:10.3969/j.issn.1000-0801.2014.03.017

Telecommunications Science ›› 2014, Vol. 30 ›› Issue (3): 94-99.doi: 10.3969/j.issn.1000-0801.2014.03.017

• research and development • Previous Articles Next Articles

A Self-Adaptive Back-Off Algorithm Based on Collision Probability and Expiration Probability of Beacons in VANET

Weiwan Liu^1,²,Zhijia Chen³,Nanjie Liu^1,²,Hao Zhong^1,⁴,Haitao Zhao^1,²

¹ College of Telecommunications ＆Information Engineering， Nanjing University of Posts and Telecommunications， Nanjing 210003， China
² Digital （Network） Gene Engineering Research Institute， Nanjing University of Posts and Telecommunications， Nanjing 210003， China
³ State Grid Shanghai Municipal Electric Power Company Information and Communications Company， Shanghai 200122， China
⁴ Jiangsu Cable Data Network Co.， Ltd.， Nanjing 210003， China

Online:2014-03-20 Published:2017-06-16

Abstract

Abstract:

In order to improve the broadcast reception rate in VANET, the conclusion that the relationship between collision probability and minimum contention window size and the relationship between expiration probability and minimum window size were reached by building Markov model. According to this conclusion, a minimum contention window size adjustment back-off algorithm called CEB was proposed, it is on the basis of the relative size between the number of expiration beacons and pre-set threshold. Simulations were done to compare the performance of CEB, RBEB and BEB, and the results show that the performance of the new proposed algorithm is better than that of RBEB and BEB.

Key words: vehicular Ad Hoc network, back-off algorithm, beacon information, expiration probability, collision probability

Weiwan Liu,Zhijia Chen,Nanjie Liu,Hao Zhong,Haitao Zhao. A Self-Adaptive Back-Off Algorithm Based on Collision Probability and Expiration Probability of Beacons in VANET[J]. Telecommunications Science, 2014, 30(3): 94-99.

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References 8

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参数	值	参数	值
场景大小	2 100 m_×2 100 m	噪声门限	-99 dBm
仿真时间	200 s	发送功率	0.01 W
车辆移动模型	IDM_LC	时隙长度	0.000 013 s
车辆移动速度	10～30 m/s	SIFS时长	0.000 032 s
无线传播模型	TwoRayGround	传播时延	0.000 001 s
MAC层协议类型	IEEE 802.11p	广播分组大小	400 byte
工作频率	5.895 GHz	发送分组频率	10 Hz
信道带宽	10 MHz	信标周期	1 500 slot

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A Self-Adaptive Back-Off Algorithm Based on Collision Probability and Expiration Probability of Beacons in VANET

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