MAC Simulation Platform Based On IEEE 802.16e And Research Of Downlink Packet Scheduling Algorithms

In order to satisfy the growing need of high-speed data services, especially the demand for mobile internet business, wireless broadband access system is also developing rapidly as well as cellular mobile communications system. As one of the most potential access technologies in the next generation communications networks, broadband wireless access technology is catching more and more attention. World Interoperability for Microwave Access is a new-generation broadband wireless metropolitan area network access technology. WiMAX technology based on IEEE 802.16e is generally known as mobile WiMAX. As a new solution of broadband wireless access technology, it uses common wide area broadband wireless access technology and flexible network architecture to promote the combination of mobile and fixed broadband networks. It can resolve the problem of'the last mile'access.This thesis simply introduces the comment of MAC in IEEE 802.16e at first, including the three sublayers in MAC and their corresponding functions, process for user data packet and QoS guarantee as well as service flow management.Then the thesis focuses on the overall design of simulation platform for the mobile WiMAX system, including platform architechture, module functions, system parameters and simulation target. Moreover, the thesis also researches the downlink packet scheduling algorithms present, comparing and discussing the advantage and disadvantage of them. Based on the research, a novel downlink packet scheduling scheme is proposed.Finally, the thesis particularly describes the realization of simulation platform using OPNET, and performance of the platform with the proposed downlink packet scheduling scheme is evaluated. The simulation result shows that the platform can work correctly and effectively, guaranteeing the basic requirement for different service flows by considering both system throughput and fairness among them.