Paper Info
Title
Performance of Loss-Tolerant TCP (LT-TCP) in the Presence of Correlated Losses
Abstract
TCP is a ubiquitous transport protocol in the Internet. However in wireless ad-hoc environments where links are unreliable, TCP has a number of performance issues. The essential reason is that TCP considers all packet losses to be due to congestion and reduces its send rate, which is not necessarily appropriate in a lossy ad-hoc environment. We have implemented Loss Tolerant TCP (LT-TCP), which addresses this issue among others in a standard Linux kernel. LT-TCP uses Explicit Congestion Notification (ECN) and forward error correction (FEC) to mitigate the effects of ad-hoc losses. In previous experimentation, we have seen a speedup of nearly two orders of magnitude using LT-TCP vs. TCP-SACK for file transfers in the presence of uncorrelated losses. We hypothesize that correlation of losses will affect the performance of the protocols and is particularly relevant to directional wireless links. In the current work, we present and compare the two protocols using a correlated loss process, whereby packets suffer the same fate as previous packets with a parameterized probability. Results show that LT-TCP performance remains stable for the amount of correlation we introduce, while TCP-SACK suffers extreme degradation. Further analysis of both protocols is warranted to discern the reasons for this disparity. Based on these results, we remain encouraged that LT-TCP is a viable approach to addressing transport protocol performance in wireless ad-hoc networks.
Year
DOI
Venue
2013
10.1109/MILCOM.2013.228
MILCOM
Keywords
Field
DocType
ad hoc networks,forward error correction,probability,transport protocols,ecn,fec,internet,lt-tcp,linux kernel,tcp-sack,ad-hoc losses,correlated loss process,directional wireless links,explicit congestion notification,file transfers,loss tolerant tcp,lossy ad-hoc environment,packet losses,parameterized probability,ubiquitous transport protocol,uncorrelated losses,wireless ad-hoc environments
H-TCP,TCP Westwood plus,Computer science,Computer network,TCP acceleration,Zeta-TCP,TCP tuning,TCP Friendly Rate Control,TCP global synchronization,Explicit Congestion Notification,Distributed computing
Conference
Citations 
PageRank 
References 
0
0.34
9
Authors
3
Name
Order
Citations
PageRank
Hourt, N.100.34
K. Kar21789.53
Bishwaroop Ganguly3314.48