TCP Using Adaptive FEC to Improve Throughput Performance in High-Latency Environments

Yurino SATO  Hiroyuki KOGA  Takeshi IKENAGA  

IEICE TRANSACTIONS on Communications   Vol.E102-B   No.3   pp.537-544
Publication Date: 2019/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3091
Type of Manuscript: PAPER
Category: Network
TCP,  FEC,  redundancy control,  congestion control,  interleave control,  

Full Text: FreePDF(1.4MB)

Packet losses significantly degrade TCP performance in high-latency environments. This is because TCP needs at least one round-trip time (RTT) to recover lost packets. The recovery time will grow longer, especially in high-latency environments. TCP keeps transmission rate low while lost packets are recovered, thereby degrading throughput. To prevent this performance degradation, the number of retransmissions must be kept as low as possible. Therefore, we propose a scheme to apply a technology called “forward error correction” (FEC) to the entire TCP operation in order to improve throughput. Since simply applying FEC might not work effectively, three function, namely, controlling redundancy level and transmission rate, suppressing the return of duplicate ACKs, interleaving redundant packets, were devised. The effectiveness of the proposed scheme was demonstrated by simulation evaluations in high-latency environments.