Multihop backpressure scheduling for IEEE 802.11s multiradio cognitive wireless mesh networks

Wireless mesh networks (WMN) are efficient and low cost solutions for the deployment of broadband access in various environments. While the capacity and the bandwidth availability of single radio WMNs may severely limit QoS, multiradio cognitive WMNs (CWMN) can provide better QoS mechanisms. This paper describes a multihop backpressure scheduling algorithm which ensures that the available bandwidth is properly shared considering the type of traffic to forward, the distance of the clients from the portal and the fluctuating conditions of the links. Performance evaluation in our simulated environment shows that, while preventing bandwidth wastage, our new scheduling algorithm achieves nearly perfect fairness.