A Self-Adaptive Back-off Optimization Scheme Based on Beacons Probability Prediction for Vehicle Ad-Hoc Networks  

作　　者：Haitao Zhao Aiqian Du Hongbo Zhu Dapeng Li Nanjie Liu 

机构地区：[1]College of Communication and Information Engineering,Nanjing University of Posts and Telecommunications

出　　处：《China Communications》2016年第12期132-138,共7页中国通信（英文版）

基　　金：supported by National Basic Research Program of China (2013CB329005);National Natural Science Foundation of China (61302100, 61201162, 61471203);Basic Research Program of Jiangsu Province (BK2011027);Specialized Research Fund for the Doctoral Program of Higher Education (20133223120002)

摘　　要：In order to improve the broadcast reception rates of beacon messages in vehicle ad-hoc networks,a conclusion that the relationship between collision probability and minimum contention window size and the relationship between expiration probability and minimum window size was reached by building a Markov model. According to this conclusion, a back-off algorithm based on adjusting the size of minimum contention window called CEB is proposed, and this algorithm is on the basis of the differential size between the number of expiration beacons and preset threshold. Simulations were done to compare the performance of CEB with that of RBEB and BEB, and the results show that the performance of the new proposed algorithm is better than that of RBEB and BEB.In order to improve the broadcast reception rates of beacon messages in vehicle ad-hoc networks,a conclusion that the relationship between collision probability and minimum contention window size and the relationship between expiration probability and minimum window size was reached by building a Markov model. According to this conclusion, a back-off algorithm based on adjusting the size of minimum contention window called CEB is proposed, and this algorithm is on the basis of the differential size between the number of expiration beacons and preset threshold. Simulations were done to compare the performance of CEB with that of RBEB and BEB, and the results show that the performance of the new proposed algorithm is better than that of RBEB and BEB.

关 键 词：vehicle ad-hoc networks back off BEACON expiration probability collision probability 

分 类 号：TN929.5[电子电信—通信与信息系统] U495[电子电信—信息与通信工程]