面向车联网按需驱动的多宿主多链路TCP拥塞控制算法

Requirements-driven and multi-homed-based multipath TCP congestion control algorithm for vehicular network

针对车联网终端设备中网络应用Qo S的多样化需求,保证与安全应用相关的高优先级数据报文发送实时性,提出了一种新的基于数据优先级与吞吐量评估的按需驱动的MPTCP拥塞控制算法PTLIA。首先,算法采用数据报文优先级以及吞吐量占比因子,表征各个数据报文的发送权重;其次,利用分批估计理论模型对MPTCP中路径状态进行实时评估;最后,依据算法模型设计,实现对网络拥塞时间窗的按需动态调整。实验与仿真验证了PTLIA算法在满足大部分网络应用需求的前提下,提高了高优先级应用的网络传输实时性。

To meet the diversified Qo S applications demanded by terminal units of a VANET, especially to ensure the timeliness and reliability when sending the high-priority messages that were related to safety-critical applications, a demand-driven MPTCP congestion control algorithm： PTLIA was proposed, which was based on message priority and throughput estimation. First, message priority and throughput proportion factor were defined to characterize the weight of each message being sent. Second, the patch estimation model was used to make real-time estimation of the state of each MPTCP path. Finally, the algorithm of PTLIA was accordingly designed to adjust, dynamically, the window of the congestion time on demand. The algorithm of PTLIA, as proved in proposed simulations and experiments, has shortened the transmission of the high-priority data, under the premise of MPTCP transmission principles.