Wireless TCP Performance Issues Carey Williamson Department of Computer Science University of Calgary.

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Presentation transcript:

Wireless TCP Performance Issues Carey Williamson Department of Computer Science University of Calgary

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #1 Wireless TCP Performance Problems Wired Internet Wireless Access High capacity, low error rate Low capacity, high error rate Hard to distinguish losses here from losses here

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #1 (Cont’d) Solution: “wireless-aware TCP” (I-TCP, ProxyTCP, Snoop-TCP, split connections...)

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #2 Wireless TCP Fairness Problems Wired Internet Wireless Bottleneck DATA ACK DATA D U AP Loss of ACK = Loss of DATA

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Multi-hop “ad hoc” networking Carey You

Copyright © 2005 Department of Computer Science CPSC 641 Winter Example #3 (Cont’d) Two interesting subproblems: –Dynamic ad hoc routing: node movement can disrupt the IP routing path at any time, disrupting TCP connection; yet another way to lose packets!!!; possible solution: Explicit Loss Notification (ELN)? Handoff? Route prediction? –TCP flow control: the bursty nature of TCP packet transmissions can create contention for the shared wireless channel among forwarding nodes; collisions between DATA and ACKs possible solution: rate-based flow control? Burst mode? Spatial reuse of channels?

Copyright © 2005 Department of Computer Science CPSC 641 Winter Summary of Wireless TCP TCP is the “four wheel drive” of TLPs Wireless is a newly emerging technology with rapidly growing deployment popularity “TCP” and “Wireless” don’t fit together well Making TCP smarter about wireless helps!