Wireless and TCP: Performance Issues

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Presentation transcript:

Wireless and TCP: Performance Issues Carey Williamson Department of Computer Science University of Calgary Winter 2018

Hard to distinguish losses here from losses here Example #1 Wireless TCP Performance Problems Low capacity, high error rate Wired Internet High capacity, low error rate Wireless Access Hard to distinguish losses here from losses here

Example #1 (Cont’d) Solution: “wireless-aware TCP” (I-TCP, ProxyTCP, Snoop-TCP, split connections...)

Wired Internet Example #2 Wireless TCP Fairness Problems Wireless DATA ACK Wired Internet Wireless Bottleneck AP U DATA Loss of ACK = Loss of DATA ACK

Example #3 Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Example #3 (Cont’d) Multi-hop “ad hoc” networking You Carey

Two interesting subproblems: 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 solutions: 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 solutions: rate-based flow control? Burst mode? Spatial reuse of channels?

Summary of Wireless TCP TCP is the “four wheel drive” of transport layer Wireless is a newly emerging technology with rapidly growing deployment popularity “TCP” and “Wireless” don’t fit together well Sometimes it can be a bumpy ride!!  Making TCP smarter about wireless helps!