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《Journal of Transportation Systems Engineering and Information Technology》 2016-06
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Optimization of Channel Access Protocols and Performance Evaluation in Cooperative Vehicle Infrastructure Environment

SHANGGUAN Wei;SHI Bin;CAI Bai-gen;WANG Jian;School of Electronics and Information Engineering,Beijing Jiaotong University;State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University;  
Safe and efficient operation of the vehicle is affected by the accuracy of the information in Cooperative Vehicle Infrastructure Environment. In order to reduce the occurrence of the channel conflict of information interaction process in Cooperative Vehicle Infrastructure Environment, the IEEE 802.11p's channel access protocol and the mechanism of Enhanced Distributed Channel Access(EDCA) are studied.And the traditional EDCA model protocol's handshake mechanism and RTS and CTS control frames' content are optimized. In addition, the back off algorithm of contention window of CVIS is designed. then a more reasonable adaptive back off algorithm which can reflect traffic characters based on contention window is proposed, and it's called ATEDCA. In order to verify and compare the communication performance of ATEDCA and EDCA in CVIS, three simulation scenarios are designed in OPNET Modeler and they are scenario of different vehicle densities, scenario of different transmission distances and scenario of different vehicle velocities. The results indicate that ATEDCA's transmission delay decreased by 10.1% compared to EDCA and its throughput increased by 7.5% compared to EDCA, and the back off slots of ATEDCA decreased by 30.6% than EDCA's in standard scenario. All in all, ATEDCA can reduce the likelihood of message channel conflict effectively.
【Fund】: 国际科技合作计划(2014DFA80260);; 国家自然科学基金“重大”(61490705);国家自然科学基金面上基金(61273089);; 北京高等学校“青年英才计划”(YETP0538)~~
【CateGory Index】: U495
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【Citations】
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【Co-citations】
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1 CHEN Xue;LIU An-feng;School of Software,Central South University;School of Information Science and Engineering,Central South University;;Energy-efficient and Reliability under White Gaussian Noise Channels of WSNs[J];计算机科学;2015-10
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3 YANG Yongchao;ZENG Gang;HUANG Yong;HUANG Lin;School of Information Engineering,Hubei University for Nationalities;;The Inspection Well Security Monitoring System Based on Zigbee Wireless Sensor Networks[J];安全与环境工程;2015-05
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