MAC frame control on wireless LAN to guarantee QoS of high priority traffics

It is important and difficult for wireless LANs with the ability of flow-based QoS control. However, the existing IEEE802.11 MAC scheme can not provide the QoS for high priority traffics, and it can not satisfy the requirements of high priority traffics with small delay, low lost-rate of packets and high throughput. To solve the problem, this paper proposed a scheme to let IEEE802.11 MAC to have the QoS ability for the high priority traffics by revising current MAC protocol. In the proposed scheme, the access points (APs) use the ACK mechanism to promise the QoS of high priority traffics, and it can guarantee the wireless bandwidth of high priority traffics, and let the lower priority flow not to compete the band-width with high priority flows by ACK dropping. The NS-2 simulations verified the performance of the proposed QoS-MAC scheme to be very effective.