摘要
前向纠错编码是一种在网络传输中应对丢包的技术。在传输过程中加入冗余数据,使接收端在丢包场景下可通过冗余数据直接恢复出原始数据。在丢包多、时延大的场景下,适当加入前向纠错编码可以大量节省超时重传的等待时间,从而提高网络传输的服务质量。过多地添加冗余会造成带宽的浪费,而过少地添加冗余会导致服务器端接收到的数据不足以恢复在传输过程中丢失的数据,因此实际应用前向纠错编码的难点在于恰当地控制冗余数据的比例。目前,前向纠错编码研究大多基于传统网络协议。而随着QUIC (Quick UDP Internet Connections)协议的崛起,由于其具有0-RTT (Round Trip Time)连接、多路复用以及连接无缝迁移等特性,因此更多的前向纠错研究开始结合QUIC协议,以进一步提升传输性能。文中首先对前向纠错编码(Forward Error Correction Coding,FEC)进行了概述,介绍了其应用场景、基本策略和自适应冗余控制策略;然后详细介绍了单播场景和组播场景中,前向纠错编码在传统协议中的研究现状;最后介绍了前向纠错编码在QUIC协议中的研究现状及仍面临的挑战。
Forward error correction(FEC) coding is a technique to cope with packet loss in network transmission.By adding redundant data to the transmission process,the receiver can recover the original data directly from the redundant data in packet loss scenarios.In the scenario of high packet loss and high latency,adding forward error correction coding appropriately can save a lot of waiting time for timeout retransmission to improve the quality of service of network transmission.Adding too much redundancy will result in bandwidth wasting,while insufficient redundancy will fail to recover lost data,so the difficulty of using forward error correction coding in practice is to properly control the proportion of redundant data.Nowadays,most of the forward error correction coding research is based on traditional network protocols,but with the rise of QUIC(quick UDP internet connections) protocol,more forward error correction researches start to incorporate QUIC protocol due to its characters like 0-RTT(round trip time) connectivity,multiplexing,seamless connection migration to further improve transmission performance.This paper gives an overview of forward error correction coding,introduces its application scenarios,basic policies and adaptive redundancy control strategies.Then it introduces the research status of forward error correcting coding in traditional protocols in unicast and multicast scenarios.Finally,this paper introduces the current research status and challenges of forward error correction coding in QUIC protocol.
作者
林利祥
刘旭东
刘少腾
徐跃东
LIN Li-xiang;LIU Xu-dong;LIU Shao-teng;XU Yue-dong(School of Information Science and Engineering,Fudan University,Shanghai 200433,China;Network Technology Laboratory Huawei Technologies Co.,Ltd.,Shenzhen,Guangdong 518129,China)
出处
《计算机科学》
CSCD
北大核心
2022年第2期292-303,共12页
Computer Science
基金
广东省重点领域研发计划(2020B010166003)
国家自然科学基金(61772139)。
关键词
QUIC协议
TCP协议
前向纠错编码
自适应冗余度
性能测量
QUIC protocol
TCP protocol
Forward error correction coding
Adaptive redundancy
Performance measurement
