Base Station Scheduler Scheme of IEEE 802.16 Mesh Mode

In IEEE 802.16 mesh mode, MAC supports two scheduling methods: centralized scheduling and distributed scheduling. In the centralized scheduling, the IEEE 802.16 base station must run an algorithm to allocate slots to each mesh subscriber node (SS). This algorithm is not defined in the IEEE 802.16 specification but rather is open for alternative implementations. In this paper, base station scheduler scheme of IEEE 802.16 mesh mode is proposed. Taking special considerations on transmission delay of each mesh subscriber node (SS), our method makes scheduling decision based on traffic demand of each SS in IEEE 802.16 mesh mode. The main idea behind our method is to provide differentiated services based on the nodes´ traffic demand, in which the node with the lower traffic demand will be at the top of the list and thus will be granted transmission time before nodes with the higher traffic demand. Extensive simulation results show that our proposed has reduces the transmission delay for each SS as well as more number of requests are served.