MPTCP动态预留数据调度策略研究

多路径传输协议（multipath transmission control protocol， MPTCP）是一种基于TCP协议的传输协议，具有高吞吐量、高带宽利用率、高传输速率等优点，且MPTCP向后兼容TCP，支持现有中间件。针对导致MPTCP的传输性能下降的MPTCP中出现乱序、缓存阻塞等问题，综合考虑每条子路径的往返时延RTT（round trip time）和接收端成功接收到的数据包个数，设计了一种动态预留数据调度算法（dynamic resource reservation data scheduling，DR-RS），当每次需要传输数据包时，子路径的发送缓存按照合理的策略为所需传输的数据包预留空间，尽量使数据包能够按序到达接收端，避免接收端缓存阻塞。利用NS-3仿真工具，对比分析了DR-RS性能，结果表明，DR-RS更合理，能使MPTCP的传输更稳定并提高了传输吞吐量，达到了负载均衡。

Dynamic reservation data scheduling mechanism for MPTCP

MPTCP is a kind of multipath transmission protocol based on TCP, which has high throughput, high utilization rate of bandwidth and high transmission rate. MPTCP is compatible TCP, supporting existing middleware, commercial low cost and has a broad space for development. Aiming at the problems of MPTCP like packet chaotic sequence and buffer block and the cache congestion problems, which will lead to the transmission performance of MPTCP drop, this paper considers round trip time (RTT) of each path and the receiver successfully receiving the number of packets. A dynamic reserved data scheduling algorithm was proposed, when transport the packets for each path is needed, the buffer was sent according to the reasonable strategy for the transmission of packets needed for the reserved space, trying to enable packet reaches the receiver and avoiding receiver buffer block. NS-3 simulation tools is used to analyze the MPTCP existing data scheduling method and dynamic reserve data scheduling method. The results show that the dynamic reserve data scheduling algorithm is more reasonable, making the MPTCP transmission more stable and improving the transmission throughput to load balance.