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为各类飞行器提供互联网接入的主要技术方案可以分为卫星通信和地空宽带2种。当飞行器处于两者的重叠覆盖区域,采用多路径进行数据通信将有可能极大改善传输性能。针对上述飞行器多接入场景,该文提出了一种多路径传输优化方案DMPTCP(dynamic multipath transmission control protocol)。针对链路通断情况发现缓慢、数据分配效率低的问题,结合飞行轨迹可预测的特点,设计了一种基于链路通断状态预测的数据分配算法;并针对链路时延和丢包率差异大所导致的接收方乱序情况严重的问题,通过接收方同时在多条子流回复连接层否定确认信息,使得发送方能够快速获得接收方总体乱序情况并对丢包进行重传。仿真实验表明:DMPTCP在聚合带宽和接收方总体乱序情况两方面均明显优于现有多路径传输机制。
The main technical solutions for providing various kinds of aircraft access to the Internet can be divided into two kinds of satellite communications and land-to-sky broadband. When the aircraft is in overlapping coverage of both, using multipath for data communication will likely result in significant improvements in transmission performance. In view of the multi-access scenario of the above-mentioned aircraft, a multi-path transmission optimization scheme DMPTCP (dynamic multipath transmission control protocol) is proposed. Aiming at the problem of slow link-up and low data distribution efficiency, a data distribution algorithm based on predictable link-off state is proposed in combination with the predictable characteristics of flight path. Aiming at the problem of link delay and packet loss rate The problem of serious disorder of the receiver due to the large difference is solved by the receiver simultaneously replying to the connection layer with multiple negative acknowledgment information so that the sender can quickly obtain the overall disorder of the receiver and retransmit the packet loss. The simulation results show that DMPTCP is obviously superior to the existing multi-path transmission mechanism in both the aggregate bandwidth and the receiver’s overall out-order situation.