An experimental study of throughput for UDP and VoIP traffic in IEEE 802.11b networks

We present experimental studies on the throughput of IEEE 802.11b wireless networks for UDP and VoIP traffic. Our experiments show that the maximum data throughput of a single station sending out UDP traffic is 6.1 Mbps. The maximum number of VoIP calls in a single cell of an IEEE 802.11b network is six if the ITU G711a-Law codec is used with 10 milliseconds of audio per RTP packet. The experiments also show that the effective available bandwidth in the wireless network is reduced by ongoing VoIP connections. Specifically, for the above codec settings, each VoIP connection reduces the bandwidth available for data traffic by 900 kbps.