Routing and Admission Control in IEEE 802.16 Distributed Mesh Networks

QoS provisioning in wireless mesh networks has been known to be a challenging issue. In this paper, we propose a new routing method (using SWEB as metrics) that is well-suited in IEEE 802.16 distributed, coordinated mesh mode. Also, an admission control algorithm (TAC) which utilizes the token bucket mechanism is proposed. The token bucket is used for controlling the traffic patterns for easy estimating the bandwidth required by a connection. In the TAC algorithm, we apply the bandwidth estimation by taking into account the hop count and delay requirements of real-time traffics. TAC is designed to guarantee the delay requirements of real-time traffics, and avoid the starvations of low priority traffics. With the proposed routing metrics, the admission control algorithm and the inherent QoS support for the IEEE 802.16 mesh mode, a QoS-enabled environment can be established. Finally, extensive simulations are carried out to validate our algorithms, and show good performance results.