CAJ | 학술논문

在流控传输协议( stream control transmission protocol, SCTP)中,多路径并行传输利用多家乡特性实现数据在关联的多条端到端路径中的并行传输。然而,受不同路径性能差异的影响,多路径并行传输将带来接收端的数据乱序。为了减轻数据乱序的程度并提高网络吞吐量性能,需要尽可能准确地估计每条路径的实时带宽与往返时间( round trip time, RTT)。本文利用扩展矢量卡尔曼滤波对多路径并行传输中每条路径的可用带宽与往返时间进行联合预测,同时提出了一种综合考虑发送端未经接收端确认的数据的路径选择算法。仿真结果表明,通过实时准确地预测可用带宽和往返时间,路径选择算法能够减轻接收端数据乱序的程度。对于带宽敏感的多路径应用场景而言,该算法的收敛速度比Kalman-CMT算法更快,对网络吞吐量性能也有一定程度地提高；对时延和带宽都敏感的多路径应用场景来说,算法在收敛速度与吞吐量两方面优势明显。
재류공전수협의( stream control transmission protocol, SCTP)중,다로경병행전수이용다가향특성실현수거재관련적다조단도단로경중적병행전수。연이,수불동로경성능차이적영향,다로경병행전수장대래접수단적수거란서。위료감경수거란서적정도병제고망락탄토량성능,수요진가능준학지고계매조로경적실시대관여왕반시간( round trip time, RTT)。본문이용확전시량잡이만려파대다로경병행전수중매조로경적가용대관여왕반시간진행연합예측,동시제출료일충종합고필발송단미경접수단학인적수거적로경선택산법。방진결과표명,통과실시준학지예측가용대관화왕반시간,로경선택산법능구감경접수단수거란서적정도。대우대관민감적다로경응용장경이언,해산법적수렴속도비Kalman-CMT산법경쾌,대망락탄토량성능야유일정정도지제고；대시연화대관도민감적다로경응용장경래설,산법재수렴속도여탄토량량방면우세명현。
Concurrent multipath transfer ( CMT) uses the stream control transmission protocol’ s ( SCTP) multihoming feature to distribute data across multiple end-to-end paths in a multihomed SCTP association. Due to the disparity of multipaths, it is facing a great challenge to solve the disorder of received data packets. In order to lighten the reordering degree and then to improve the through-put performance, we need to estimate the bandwidth and round trip time ( RTT) of the real-time paths as exactly as possible. In this paper, we use the extended vector Kalman filter to predict the available bandwidth and RTT of each path simultaneously. Based on this, we propose a predictive path selection algorithm for CMT in SCTP. Simulation results show that the path selection algorithm can lessen the data packets disordering by correctly predicting each path’ s bandwidth and RTT in real time. To bandwidth sensitive scene, the algorithm can converge more quickly than Kalman-CMT and can improve the system total throughput in a certain extent. To time and bandwidth sensitive scene, the algorithm can greatly improve the convergence speed and total throughput than Kalman-CMT.