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Predicting Internet Performance on Satellite Networks

Learn how to predict and improve Internet performance on satellite networks, explore challenges of protocols and implementations, and study simplified methods to optimize satellite network efficiency under real-world loads.

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Predicting Internet Performance on Satellite Networks

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  1. Anticipation:How can we predict Internet performance on satellite networks,and why do we want to do that? Hans KruseJ. Warren McClure School of Communication Systems ManagementOhio Universitykruse@ohio.edu 5th SCGII

  2. Introduction • Satellite links produce long-delay control loops (in GEOs) or variable delay (in LEOs). • We cannot always predict how protocols and their implementations will react. • We need simple ways to study satellite networks under Internet-type loads.

  3. Network Reference Points End User a Local Network b Regional Network c Global Internet Backbone

  4. End User • Interface point (a) between one user (or very few users) and the network • Bandwidth must be usable by a single application • These issues have been studied and largely resolved for • Bulk data transfer • Web access

  5. Sample Result for HTTP

  6. TCP Window Size 1 connection persistent

  7. Bulk File Transfer

  8. All other interfaces • At all other points traffic consists of a mix flows from different users and applications • Issues: • Utilization • Fairness • Appropriate Network Configuration • Mitigation Strategies

  9. Example: ISP Egress Link Internal Net Dial-In Egress Users Traffic Trace

  10. Traffic Statistics Outbound Egress Inbound Traffic Trace

  11. An Equivalent Network Trafgen #1 Discard #1 Outbound Egress Inbound Discard #2 Trafgen #2

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