Effective traffic control in IEEE 802.16j WiMAX networks

The IEEE 802.16j WiMAX is designed to provide a broadband multi-hop wireless access. However traffic transmission in such networks faces the challenges of user demand differentiation, link congestion and network status variation. To tackle those issues we construct effective schedulers implemented at each RS to achieve the desired end to end flow control and congestion control over the whole network. Specifically we employ the control theory method and into the schedulers to control and tune both downlink and uplink traffic rate at each RS in a distributed manner. Different hops of scheduling can be coordinated with each other so that all traffic transmissions over the whole network can be regulated to and stabilized at the desired levels. Both the theoretical analysis and experiment tests verify that our proposed scheduling schemes can achieve an effective traffic control over the IEEE 802.16j WiMAX networks.