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TCP/IP Performance across Optical Packet-Switched (OPS) Networks

TCP/IP Performance across Optical Packet-Switched (OPS) Networks. Jingyi He ( Co-supervised by Dr. Gary Chan and Dr. Danny Tsang ) Apr. 25, 2002. Outline. The perspective of OPS networks Special features of OPS networks (our research motivations) Deflection routing Packet aggregation

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TCP/IP Performance across Optical Packet-Switched (OPS) Networks

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  1. TCP/IP Performance across Optical Packet-Switched (OPS) Networks Jingyi He (Co-supervised by Dr. Gary Chan andDr. Danny Tsang) Apr. 25, 2002

  2. Outline • The perspective of OPS networks • Special features of OPS networks (our research motivations) • Deflection routing • Packet aggregation • Simulation model and results • Conclusions

  3. Towards the Optical Internet… • Current Internet • Point-to-Point WDM links • Electronic routers (switches) O/E/O conversion Electronic bottleneck • Near-term Solution: Wavelength-Routed Networks

  4. Wavelength-Routed Networks • Electronic routers  Wavelength-routing switches • Lightpaths • Problem: circuit switching low bandwidth efficiency

  5. Optical Burst-Switched Networks • A compromise between circuit-switching and packet-switching • A control packet is first sent to set up the “connection” for a burst, which is released as soon as the burst is sent • Bandwidth is reserved for a shorter time than circuit-switching  higher bandwidth efficiency

  6. The Eventual Solution…may be OPS Networks! • Large capacity • High bandwidth efficiency • Rich routing functionalities • Great flexibility and reliability

  7. An Example

  8. Special Features • Deflection Routing • A contention resolution scheme in case of no optical buffer • Packet Aggregation • To relieve the optical packet switches of the heavy burden of processing each individual (small) packet • Possible schemes: mixed-flow, per-flow

  9. Motivations of Our Research • Deflection routing  Out-of-order delivery of packets • Packet aggregation  In case of deflection or packet dropping, the effect may be magnified What’s their impact on TCP/IP performance?

  10. Simulation • Simulator: ns-2 • Simulation model:

  11. Performance Metrics • TCP throughput (goodput) • TCP fairness among the flows • Jain’s Fairness Index: • f (0, 1], with f =1 meaning perfect fairness

  12. Mixed-flow Aggregation

  13. Per-flow Aggregation

  14. Comparison

  15. Conclusions • Deflection routing significantly improves the TCP fairness • Mixed-flow aggregation outperforms per-flow aggregation in terms of both TCP throughput and fairness Q & A

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