Various issues associated with "Simulation of a NASA LEO Satellite Hybrid Network" are presented in viewgraph form. Specific topics include: 1) Objective of the investigation; 2) Satellite orbit description and included nodes; 3) TCP and FTP simulation descriptions; 4) Simulation results; and 5) Derived conclusions

Bhasin, Kul B.

Konangi, Vijaya K.

Wallett, Thomas M.

English

NASA Technical Reports Server

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2 JUNE19981SAT_LLIT_ N_O_S: _CHKT__ I CLEVE_N D
APPLICATIONS, AND TECHNOLOGIES
SIMULATION OF A NASA LEO SATELLITE HYBRID NETWORK
by
Thomas M. Wallett*, Vijaya K. Konangi**, and Kul B. Bhasin*
*Satellite Networks and Architectures Branch
NASA Lewis Reesarch Center, Mall Stop 54-5
Cleveland, Ohio 44135
(216) 433-3673 Thomes.M.Wellett(_lerc.nasa.gov
(216] 433-,3676 KuI.B.Bhesln_erc.nesa.gov
"Department of Electrical and Computer Englnesrlng
Cleveland State Unlveralty
Cleveland, Ohio 44115
(216) 687-2588 Konangl(_csvax.csuohlo.edu
I SATELLITE NETWORKS: ARCHITECTURES,2 JUNE 1998 APPLICATIONS, AND TECHNOLOGIES j CLEVELAND
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OBJECTIVE
Investigate the performance of TCP/IP in a hybrid network consisting
of a global terrestrial network and a LEO satellite by simulation.
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Satellite LEO - circular orbit at 650 km altitude
52 degrees inclination
FTP server
Transmission and reception at 9600 bps
Houston, United States
Central node of a star topology
FTP client
Terrestrial transmission and reception at DS0 (64 kbps)
Radio transmission and reception at 9600 bps
Seoul, South Korea; Canberra, Australia; Toulouse, France;
India; Saudi Arabia; Central Africa; Brazil
Above terrestrial nodes connected to Houston
Terrestrial transmission and reception at DS0 (64 kbps)
Radio transmission and reception at 9600 bps
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APPLICATIONS, AND TECHNOLOGIES
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TCP simulation incJudes
• Connection establishment and closing using three-way handshaking
• Flow control
• End-to-end reliability
• Reordering of the data at the receiver
• Slow-start congestion avoidance and control
FTP simulations
• Average size of the file modeled using a normal distribution
• Generation rate for sessions modeled using a Poisson process
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I SATELLITE NETWOPJKS: ARCHITECTURES, !2 JUNE 1998 _ APPLICATIO S, AND TECHNOLOGIES CLEVELAND
Simulation results for 60 KB, 300 KB, and 1500 KB files
• Throughput
• End-to-end delay
• Satellite transmitter queue size (7500 KB files)
• Canberra receiver queue size (7500 KB files)
• Client congestion windows
• Sewer congestion windows
• Client-server congestion windows
2 JUNE 1998 SATELLITE NETWORKS: ARCHITECTURES, CLEVELANDAPPLICATIONS, AND TECHNOLOGIES
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CONCLUSIONS
• The satellite transmitter average throughput saturates for large files.
(~ 3S00 bps)
• Houston receiver average throughput inconclusive.
(radio reception only)
• Frequent, large End-to-end delays for large files.
(small % increase for file size increase)
• Infrequent, small End-to-end delays for small files.
(large % increase for file size increase)
• Queueing delays at the terrestrial nodes are not significant.
• TCP slow-start algorithm degrades the performance for large files.
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Simulation of a NASA LEO Satellite Hybrid Network

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