How to avoid killing the wireless internet with your phone

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Presentation transcript:

How to avoid killing the wireless internet with your phone Patrick Verkaik, Yuvraj Agarwal, Alex C. Snoeren contact: pverkaik@cs.ucsd.edu Voice-over-IP in wireless Voice-over-IP =telephony over Internet Voice-over-IP in WiFi WiFi VoIP phone Phone call VoIP over WiFi Access point Internet Internet café offering WiFi But now add more callers.. How not to kill wireless 1. Prioritise (no backoff) and schedule outgoing VoIP Time Note: no collisions VoIP traffic 2. Access point aggregates incoming VoIP, saving overhead Web traffic packet Time No changes to non-VoIP computers at all Less airtime for e.g. web users More airtime wasted on collisions and backoff Current impact on TCP Reduced impact on TCP WiFi contention procedure packet Expected (from To transmit data: Wait for everyone to be quiet Wait a bit more (back off) Transmit In case of a collision, back off more, then retry Our solution size of VoIP packets) (emulated) Measured (802.11b) Our solution (calculated) Inefficiency of VoIP Current (measured) TCP capacity destroyed!