Effects of Security Features on the Performance of Voice Over WLAN
Changhua He · 2004
This project studies the effects of security features on the per packet delay and loss rate of voice traffic over WLAN. We model the security features by adding packets and extending the length of each data packets. Different authentication and encryption schemes (WEP with Challenge-Response authentication and TKIP with a long term shared key and 4-way handshake) are investigated to represent the common secure WLAN implementations. Based on our simulation, when the traffic load is light in the network, adding security features does not decrease the performance, while the network performance will decrease more rapidly when the traffic load is getting higher and higher. That is because in 802.11 MAC, the frame body is transmitted in a higher rate (11Mbps) than the packet overhead, the number of packets transmitted over 802.11MAC dominates the performance in this case, instead of the length of the packets.