Research On WiMAX Modeling And Service Simulation Based On OPNET

With the rapid development of communication,BWA(broad wireless access) which is an important part of wireless communication technology also has extensive applied foreground and huge development potential.WiMAX(Worldwide Interoperability for Microwave Access)which locate in the wireless metropolitan area networks takes the IEEE 802.16 series wide band wireless standard as a foundation can provide BWA with more wide area and higher rate.So this wireless access technology can displays its superiority especially in area where there is a lack of basic infrastructure.WiMAX networks which affected by the influence of not have the fixed assignment frequency band,is not developed for a long time.In recently years,some countries and areas assigned frequency to it,so WiMAX networks became taken seriously and used by people step by step.But these uses are partial and experimental. So It is very necessary to build some models that conforms to the 802.16 protocol and meaningful to do some simulations on a network simulation software.First of all,this paper has a study and research on the protocol,than,has a secondary development of the BS(Base Station)and SS(Subscriber Station)function model that conforms to the 802.16d protocol by OPNET,finally build an experiment networks.This article main research content is as follows:1.Summarized the development of wireless access technology and its features.2.Done some research on 802.16d protocol,especially on its MAC layer, sublayers,the band width requested the WiMAX radio resource management and the wireless link control.3.Done some research of the OPNET on the develop environment,Modeling Methods,Data collection of the simulation result.4.Done some researches with OPNET on the node and protocol domain of BS and SS of the 802.16 networks,especially researched on the MAC protocol of the BS node.Written and researched enter,exit function of some module.Established a 802.16d network simulation platform.Simulated the communication schedule of the Simulation Module and tested the throughput of the link.5.Done some research on the Real Time Polling Service(rtPS),non-Real Time Polling Service(nrtPS)of scheduling service,use this network platform done some research and simulation to these two services.