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Performance Evaluation of TCP Throughput on Wireless Cellular Networks

Performance Evaluation of TCP Throughput on Wireless Cellular Networks. Osaka University Masahiro Miyoshi , Masashi Sugano, Masayuki Murata mmiyoshi@d3.dion.ne.jp. Contents. Backgrounds Objectives Network model Analysis method Evaluation Conclusion. Backgrounds.

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Performance Evaluation of TCP Throughput on Wireless Cellular Networks

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  1. Performance Evaluation of TCP Throughput on Wireless Cellular Networks Osaka University Masahiro Miyoshi, Masashi Sugano, Masayuki Murata mmiyoshi@d3.dion.ne.jp

  2. Contents • Backgrounds • Objectives • Network model • Analysis method • Evaluation • Conclusion

  3. Backgrounds IMT-2000 Network in JAPAN Collision detection ( Using Slotted ALOHA ) TCP Mobile Terminal Base Station TCP Mobile Terminal Transmission error recovery ( Using FEC,ARQ )

  4. Past researches Evaluate TCP performance on Wireless channels • Influence of transmission error • Influence of handoff No consideration influence of lower layer protocols above researches

  5. Objectives Evaluate TCP performance • By considering collision detect protocol Slotted ALOHA • By error correct protocol ARQ, FEC

  6. packet loss in bottleneck buffer packet loss by transmission error packet loss by collision Network Model Wireless Link Wired Link Mobile Terminal Mobile Switching Center TCP Source Base Station Destination TCP Source 　・・ Bottleneck Link Up Link→ ←Down Link TCP Source

  7. Network Model Our View about packet loss on TCP ・packet loss in bottleneck buffer ・packet loss by transmission error → packet loss on TCP layer ・packet loss by collision (using Stop and Wait retransmission) → delay on TCP layer

  8. Analysis Method N: packet retransmission interval • Slotted ALOHA throughput L: packet length Terminal A Terminal B • Slotted ALOHA delay × collision

  9. Analysis Method • TCP throughput Packet loss rate ←Parameter Round trip time ← Time out time ←

  10. Parameter sets Evaluation Bandwidth of wireless link : 2Mbps Bandwidth of wired link : 125Kbps The number of mobile Terminal: 30nodes TCPsegment size: 100Bytes Improving throughput at the Slotted ALOHA does not necessarily lead to the TCP throughput improvement

  11. Parameter sets Bandwidth of wireless link : 2Mbps Evaluation Bandwidth of wired link : 125Kbps The number of mobile Terminal: 5nodes TCPsegment size: 100Bytes ARQ：Go back N, retransmission times 1 FEC(5bit correct)：Reed Solomon(127,117) FEC(20bit correct)：Reed Solomon(127,87) The use of FEC is effective to prevent TCP throughput degradation

  12. Conclusion • Improving throughput at the Slotted ALOHA does not necessarily lead to the TCP throughput improvement • The use of FEC is effective to prevent TCP throughput degradation We have shown TCP performance considering influence of lower layer protocols

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