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VoIP over WLAN is poised to become an important Internet application. However, two major technical problems that stand in the way are low VoIP capacity in WLAN and unacceptable VoIP performance in the presence of coexisting traffic from other applications. With each VoIP stream typically requiring less than 10 Kbps, an 802.11b WLAN operated at 11 Mbps could in principle support more than 500 VoIP sessions. In actuality, no more than a few sessions can be supported due to various protocol overheads. This paper proposes and investigates a scheme that can improve the VoIP capacity by close to 100% without changing the standard 802.11 CSMA/CA protocol.

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Format:PDFSize:359 KB
Date:Aug 2004
Pages:34

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