QoS coordinated distributed scheduling for 802.16 mesh networks

IEEE 802.16 WiMAX is one of the popular technologies in the field of wireless networking recently, where channel resource allocation and reservation have become key issues. In the paper a QoS Coordinated Distributed Scheduling scheme (QC-DSCH) based on priorities is proposed to meet the QoS requirements in MAC layer. There are three algorithms in QC-DCSH. Adjusting hold-off time (AH) algorithm exploits scheduling algorithm negotiation decision with three-way handshaking according to the traffic priorities. The allocating mini-slots (AM) algorithm gathers the availability mini-slots information of the neighbors to portion out the data frames adaptively, according to requesters demands with diverse priorities. The dynamically adjusting hold-off time (DH) algorithm can reflect the status of allocated mini-slots and adjusting the hold-off value. The proposed algorithm is able to reduce the average delay and increase the throughput of VoIP traffic.