Research On QoS Scheduling Algorithm In IEEE 802.16

In order to meet the requirement of broadband wireless access in the future, the IEEE standard organization proposed 802.16 series standard. The standard supported reliable telecom level QoS by supporting strict delay requirement applications, such as voice and video etc.In modern network system, providing QoS guarantees for various kinds of traffic with different QoS requirement is a very important and challenging task. Although IEEE 802.16 protocol claimed to support QoS guarantees for different applications, it did not give the concrete method to schedule traffic. In this paper, we will have a talk about the QoS architecture and investigate in the relative problems.At first, this article proposes a new 802.16 scheduling architecture based on GPSS,integrating some kinds of existing scheduling algorithms. Then it gives a model implementation simulating 802.16 MAC protocol using Anylogic. At Last, the combined scheduling algorithms are added into the model. The scheduling architecture accords with the description of MAC protocol in 802.16 standard and the four kinds of services'models. We take the dynamic scale adjustment for rtPS services to improve the network performance. The max-min fair scheduling algorithm ensures fairness between SS.The simulation results prove the new QoS architecture is effective, which can not only meet the delay requirement of real time applications, but also guarantee fairness among subscriber stations.