Research On The QoS Mechanism Of IEEE 802.16 System

As an emerging technology, IEEE 802.16 is anticipated to be a viable alternative to traditional access techniques due to its high performance and low cost. But providing Quality of Service for diverse applications which is necessary to support new multimedia applications such as voice over IP (VoIP), voice conference, online gaming and multimedia streaming, is a quite challenging problem to the deployment of IEEE 802.16. Although several scheduling services for various applications have been defined in IEEE 802.16 Standard, how to implement effective resource management depending on these scheduling services does not be designated.To solve this problem, in this thesis, a new QoS architecture which contains scheduling module, admission control module and queue management module, is proposed firstly based on the detailed study of IEEE 802.16 and recent research on the QoS of IEEE 802.16. Based on this QoS architecture, the thesis studies out three scheduling schemes for the Uplink request/grant scheduling module: Earliest Deadline First Based Round Robin Scheduling Algorithm (EBRRSA), Deadline Based ON/OFF Scheduling Tree Algorithm (DBOSTA) and Token Ring Based Round Robin Scheduling Algorithm (TBRRSA). Subsequently, according to this QoS architecture mentioned above, a NS2 simulation module which includes three scheduling algorithms above is developed. With this simulation module, the performance of these three algorithms is evaluated. Finally, by simulation analysis, it shows that DBOSTA has the best integrated performance among these three scheduling algorithms.