中国铁道科学2024，Vol.45Issue(2)：175-184,10.DOI:10.3969/j.issn.1001-4632.2024.02.17
针对车地传输TCP协议优化的TTI-RTT拥塞控制算法
TTI-RTT Congestion Control Algorithm Optimized for Train-Ground Transmission TCP Protocol
摘要
Abstract
To adapt to the dynamic and variable network environment of the 5th Generation Mobile Communication System-Railway,and to address issues such as decreased throughput,increased transmission delay,and difficulty in ensuring the reliability of detection data transmission between train and ground,this paper analyzes the transmission control protocol(TCP)congestion control process and compares the existing problems with three basic congestion control algorithms:TCP-Reno,TCP-Vegas,and TCP-Westwood.Based on this analysis,a congestion control algorithm that combines transmission time interval(TTI)and round-trip time(RTT)called the TTI-RTT algorithm is proposed.This algorithm calculates the test statistic for pairwise comparison and the current network congestion factor based on the RTT measurement value,using both as a criterion for judging network congestion.It dynamically adjusts the additive and multiplicative factors based on the congestion factor reflecting the degree of network congestion.Additionally,the transmission time interval is flexibly adjusted during different conditions of congestion control.Using the NS-3 simulation software,a point-to-point communication network topology is constructed considering the error code impact of high-speed railway 5G-R wireless channel,the TTI-RTT congestion control algorithm is validated through simulation and compared with the three basic algorithms in terms of performance.The results show that under different packet loss rates,the average throughput of the proposed algorithm remains above 9 Mb·s-1,which is an increase of about 5.9％over the highest and most stable throughput of the basic TCP-Reno algorithm,with significant improvements in real-time throughput stability.关键词
车地传输/检测数据/5G-R/TCP算法优化/拥塞控制/吞吐量Key words
Train-ground transmission/Inspection Data/5G-R/TCP algorithm optimization/Congestion control/Throughput分类
交通工程引用本文复制引用
姜尚炎,孙斌,乔婉淇,郭岳,杨树忠..针对车地传输TCP协议优化的TTI-RTT拥塞控制算法[J].中国铁道科学,2024,45(2):175-184,10.基金项目
中国国家铁路集团有限科技研究开发计划课题(N2023G052) （N2023G052）
中国铁道科学研究院集团有限公司院基金课题(2023YJ097) （2023YJ097）
