Throughput optimization for asymmetric high delay links
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Date
2002-05
Authors
Joo, Swee Keong
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Abstract
Satellite communications are becoming increasingly important due to the geographical
reach of satellite transmissions and high bandwidth requirements. Bi-directional satellite
links often comprise a forward and a reverse space link that are asymmetric in bandwidth.
The forward space link has high bandwidth and high delay, while the reverse link has
limited bandwidth and high delay. Throughput optimization is required in order to utilize
the high bandwidth space link effectively to support interactive services.
In addition, the asymmetric nature of the space links would require different flow
control and routing strategies compared with existing networks. The importance of QoS
(Quality of Services) over satellite link is the main focus of this research, which addresses
how mitigated protocols and QoS mechanisms can be used to optimize satellite link
throughput for TCPIIP streams.
A model of the TCPIIP stack over Asymmetrical Geostationary Satellite Links has been
developed to evaluate support of prioritized and non-prioritized TCP traffic over the
satellite link. Traffic prioritization is needed to provide end-to-end terrestrial and sateIlitebased
networks. Various parameters, such as router buffer size, TCP window size and
performance of Random Early Detection with In and Out (RIO) over the satellite link is
examined
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Satellite communications are becoming increasingly , due to the geographical reach of satellite