一种基于丢包预测的选择性网络编码策略

Selective Network Coding Strategy Based on Packet Loss Prediction

随着多样化无线网络接入技术和多网络接口设备的大规模应用,多宿主网络终端的传输性能受到国内外学术界的广泛关注。多路径传输协议(MTCP)是其中代表性研究之一,其通过聚合多条链路的带宽资源,把数据流分发到多条链路上并行传输,有效地提高了网络的传输性能。然而,在链路差异大的异构网络中传输数据,容易引起数据包失序严重等问题,从而给传输性能造成巨大的影响。因此,国内外许多学者提出了网络编码(MPTCP-NC)策略来弥补这个缺陷,该方式有效提升了网络传输的鲁棒性。但是,编码系数的频繁生成和计算,会额外增加MPTCP传输时延,并且会浪费有限的带宽资源。针对此问题,文中提出了一种基于丢包预测的MPTCP选择性编码策略(MPTCP-SNC),该策略充分考虑了异构无线网络环境的差异性,并根据链路丢包率状态选择性执行编码策略,降低了网络编码带来的额外消耗,并提高了MPTCP的传输性能。

With the development of diversified wireless network access technology and large-scale equipment of multi-network interface devices,network transmission performance for multi-homed terminals is widely concerned by academic circles at home and abroad.Multi-path Transmission Control Protocol(MPTCP)is one of the classical studies,which distributes data to multiple paths in parallel way and enhances the performance of transmission.However,in heterogeneous wireless networks,due to the characteristic of large difference in path,it is easy to cause many problems including serious packet disorder and huge impact on MPTCP performance.Therefore,many scholars proposed that using Network Coding(MPTCP-NC)to compensate for this defect,which effectively improves the robustness of network transmission.Furthermore,the frequent generation and calculation of coding coefficients additionally increases the MPTCP transmission delay and wastes the limited bandwidth resources.Aiming at solving these problems,this paper proposed an MPTCP’s Selective Network Coding(MPTCP-SNC)based on packet loss prediction.MPTCP-SNC fully considers the differences of heterogeneous wireless network environment and selectively performs network coding according to the loss rate states of links,which reduces the extra consumption caused by blind network coding and improves the transmission performance of MPTCP.