Enhancing TCP performance over satellite channels

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Authors
  1. Kammermann, M.
  2. Latour, H.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
In general the Transmission Control Protocol (TCP) works well while establishing end-to-end connections for common Internet services. However, three are two problem areas associated with performance over satellite channels: propagation delay and channel noise effects. Noise is a common problem in wireless technologies and consequently the bit-error-rate (BER) is significantly higher than in wired networks. TCP is particularly vulnerable to BER because it is a reliable protocol. TCP will retransmit lost or corrupted data when errors are detected. However, the main design goal was to avoid congestion-collapse in networks. The protocol has no means to decide whether a loss event was caused by congestion (buffer-overflow) or by corruption (noise jamming). Nevertheless, TCP should react in a different way, depending on the type of errors: it should immediately retransmit outstanding data if the loss was caused by noise, and it should reduce network traffic if congestion was the reason for dropping data-packets. Currently every loss indicates network congestion for the TCP standard version defined in RFC 0793. As a result it will reduce its sending rate significantly by invoking congestion control algorithms, regardless of the source of errors. TRUNCATED
Keywords
TCP/IP;Transport protocols;Transport Control Protocols/Internet Protocol;TCP performance;IETF RFC 0793
Report Number
DREO-TR-2000-079 — Technical Report
Date of publication
01 Nov 2000
Number of Pages
54
DSTKIM No
CA010487
CANDIS No
514964
Format(s):
Hardcopy;Document Image stored on Optical Disk

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