电讯技术2017，Vol.57Issue(4)：463-468,6.DOI:10.3969/j.issn.1001-893x.2017.04.016
多信道车载网中基于时分多址的MAC改进算法
An Improved TDMA-based MAC Algorithm for Multichannel VANETs
摘要
Abstract
The Vehicular Ad-Hoc Networks(VANETs) provide communication services for time-critical road safety applications and non-safety applications.The challenges of multichannel VANETs Medium Access Control(MAC) protocol include successful delivery of time-critical safety messages and high reliability,and high channel utilization for non-safety messages.Therefore,an improved time division multiple access-based MAC(I-TDMA-MAC) is proposed in this paper.In I-TDMA-MAC,the two mini-slots in synchronous frame interval are allocated to each vehicle to increase the collision-free channel access ratio and reliable time-critical safety message deliveries.At the same time,empty slots are reallocated to enhance bandwidth utilization of service channels,and the Shortest Job First(SJF) algorithm is used to give the prioritization to allocate the empty slots.The simulation results show that the packet delivery ratio of safety messages is enhanced as high as 99%,and the bandwidth utilization of service channels is up to 90% when traffic density is more than 100 vehicle/km.关键词
车载网/IEEE1609标准/时分多址/媒体接入控制/时隙分配Key words
vehicular ad-hoc network(VANET)/IEEE 1609 standard/time division multiple access(TDMA)/medium access control(MAC)/time slot allocation分类
信息技术与安全科学引用本文复制引用
张栋梁,曲豪,海本斋..多信道车载网中基于时分多址的MAC改进算法[J].电讯技术,2017,57(4):463-468,6.基金项目
国家自然科学基金资助项目(1404602) （1404602）
河南省高等学校重点科研项目(15B520006) （15B520006）
河南省科技厅2017年科技攻关项目(172102210564) （172102210564）
国家开放大学2014年研究课题(G14A2402Y) （G14A2402Y）
河南省教育厅2015年重点研究项目(15A520060) （15A520060）
