802.16e System Simulation Flatform And Simulation Of The Scheduling Algorithms

The MAC layer and the PHY layer specification are defined in 802.16e stardard.Service flows are classified into the UGS,ertPS,rtPS, nrtPS and BE types according to their QoS requirements, and the QoS requirements are satisfied by the MAC layer mechanisms respectively. In the PHY layer, OFDM/OFDMA techniques are introduced to guarantee the reliable data transmission in various physical environments. Although perfect QoS guarantee are provided for different services at the beginning of the standardization of Wireless Metropolitan Area Networks, the QoS framework structures used to implement QoS support are not given by the standard, neither the scheduling algorithms used in the OFDMA PHY layer are given. All of these issues are left for researchers to implement.In this paper, the developing process, the state of arts and trend of IEEE standard 802.16 are introduced ,then analyze the main technical characteristics of Media Access Control (MAC) layer and physical layer of 802.16e which is one of IEEE 802.16 protocals and based on technical analysis on the 802.16e standard ,the emphasis goes to the introduction of design of system framework of 802.16e simulation flatform ,defination of functions of the framework modules, description of the relationship between the modules.moreover, on OFDMA wireless resource scheduling services in the MAC layer are analysed , weighted round robin, MAX C/I and Proportional Fair Scheduling algorithms are introduced in this paper and all these algorithms are simulated from aspects of system throughput and equitableness using OPNET simulation tool.