VANET中一种安全消息拥塞控制机制

doi:10.3969/j.issn.1000-436x.2014.05.018

Abstract

Abstract:

In vehicular ad-hoc network (VANET), periodic safety messages (beacons) may consume the entire channel bandwidth in dense traffic, resulting in a saturated/congested channel. As a solution to the problem, a congestion control mechanism based on beacon frequency and communication radius adjusting was proposed. Firstly, a basic channel re-source allocation algorithm for periodic safety message (PSM) and event-driven safety message (EDSM) was proposed, which limits the beacon load level below a specific threshold and thus implicitly reserves enough bandwidth for EDSM. And then, according to the accuracy and probability of successful reception, the beacon frequency and communication radius dynamically was adjusted to control the number of vehicles in the channel, while maintaining the vehicular safety.

Key words: PSM, EDSM, congestion control, channel allocation

Jian SUN,Hong-zhi LI,Ling-bo GUO,Sheng-lai CHEN. Congestion control mechanism in VANET for safety messaging[J]. Journal on Communications, 2014, 35(5): 134-140.

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References 12

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参数	数值
B	2 KB
D	2 KB
C	6 Mbit/s
p_k-thr	10^{? 3}
p_thr	10^{? 6}
t	0.1 s
λ	1
p₀	0.904 8
p₁	0.090 5
2	0.004 7
p_safe?thre	0.9
R_max	500 m
a	10

车流量密度ρ/(辆·(km²)^?1)	速度v/(km·h^?1)	精确性n
0＜ρ≤500	100≤v≤150	10
500＜ρ≤600	90≤v 100＜	9
600＜ρ≤700	80≤v 90＜	8
700＜ρ 800≤	70≤v 80＜	7
800＜ρ≤900	60≤v 70＜	6
900＜ρ 1 000≤	50≤v 60＜	5
1 000＜ρ 1 300≤	40≤v 50＜	4
1 300＜ρ 1 700≤	30≤v＜40	3
1 700＜ρ≤2 500	20≤v 30＜	2
2 500＜ρ≤5 000	0≤v＜20	1

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Congestion control mechanism in VANET for safety messaging

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