车载自组网中基于车辆密度的多跳广播协议

doi:10.11959/j.issn.1000-436x.2016233

Abstract

Abstract:

In vehicular ad hoc networks (VANET), the medium access control (MAC) protocol was of crucial importance to provide time-critical multihop broadcast. Contemporary multihop broadcast protocols in VANET usually choose the farthest node in broadcast range as the forwarder to reduce the number of forwarding hops. However, it was demonstrated that the farthest forwarder may experience long contention delay in case of high vehicle density. An IEEE 802.11p-based multihop broadcast protocol vehicle density based forwarding (VDF) was proposed, which adaptively chose the forwarder according to the vehicle density. The evaluation results in safety warning and online game applications show that, VDF could shorten broadcast delay by achieving the proper trade-off between the contention delay and coverage speed.

Key words: VANET, MAC, broadcast, IEEE 802.11p

Jia-wei HUANG,Shao-hua ZHONG,Lian-hai LIU,Jian-xin WANG. Vehicle density based multihop broadcast protocol in VANET[J]. Journal on Communications, 2016, 37(12): 32-41.

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References 14

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参数	参数值	参数	参数值
车辆密度α	0.1, 0.4, 0.7辆/米	行驶速度v	50km/h
道路长度L	5 000m	车道数	4
传输半径范围R	300m	信道传输模型	Two Ray Ground
时隙长度σ	20μs	DIFS长度D	2.5
CWmin	31	CWmax	1 023
信道传输速率r	1Mbit/s	仿真时间	100s

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Vehicle density based multihop broadcast protocol in VANET

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