Director of Research (if dissertation) or Advisor (if thesis)
Nicol, David M.
Department of Study
Computer Science
Discipline
Computer Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
XOR packets
Transmission Control Protocol (TCP)
network congestion
congestion resilience
network protocol enhancement
forward error correction
exclusive-or (XOR)
packet loss
network reliability
Abstract
In response to the advent of publicly-accessible high bandwidth links, we explore a potential resiliency enhancement to TCP that makes use of extra bandwidth to do forward error correction using the exclusive-or binary operation. We implement this XOR-Packets enhancement in the FreeBSD network stack and show that it guarantees the ability to reconstruct any single packet loss without the need for retransmission. Furthermore, in the unlikely best case, up to a third of the TCP stream can be lost without the need for retransmissions. We test our scheme against FreeBSD's default NewReno implementation with and without Selective Acknowledgment and find that our enhancement's goodput scales better than both for large stream sizes in high network congestion conditions.
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