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How to avoid killing the wireless internet with your phone

How to avoid killing the wireless internet with your phone. Patrick Verkaik, Yuvraj Agarwal, Alex C. Snoeren. Voice-over-IP in wireless. contact: pverkaik@cs.ucsd.edu. Voice-over-IP in WiFi. Voice-over-IP =telephony over Internet. Internet café offering WiFi. Internet. Time. Phone call.

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How to avoid killing the wireless internet with your phone

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  1. How to avoid killing the wireless internet with your phone Patrick Verkaik, Yuvraj Agarwal, Alex C. Snoeren Voice-over-IP in wireless contact: pverkaik@cs.ucsd.edu Voice-over-IP in WiFi Voice-over-IP =telephony over Internet Internet café offering WiFi Internet Time Phone call VoIP over WiFi Access point WiFi VoIP phone But now add more callers.. How not to kill wireless 1. Prioritise (no backoff) and scheduleoutgoing VoIP Note: no collisions VoIP traffic 2. Access point aggregatesincoming 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!

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