Research On WWW Traffic Modeling And Scheduling Algorithm In Mobile Communication System

With the improvement of capability of computer and simulating technology, the use of computer simulation is more and more widely. OPNET is a high trustiness network model, design, simulation and analysis tool. First, This paper main introduce UMTS simulation platform which base on OPNET, and study type traffic point-to-point key performance of the UMTS network,as well as the feasibility base on traffic service QoS's demand provide vary class service. The simulation results indicate this system simulation platform is effective for UMTS system's performance analysis, and afford objective, reliable ration warranty for network programming and designing.The analysis of the performance of computer simulating system are always based on some hypothetic preconditions, for example, channel model,source model, etc. since the traffic model has a great influence on the veracity of the system capability evaluating result, the establish of a correct traffic distributing model becomes an very important part in system simulation model. In part three proposes a three-layer traffic model from analyzing the ON/OFF model and the WWW traffic stream that fit actual wireless traffic better, and build a single cell UMTS simulation plat. Stimulating on the OPNET model proves that three-layer traffic model is more precise than ON/ OFF modeling. It is a kind of ideal traffic model. Applying this model benefit improving quality and efficiency of the wireless network programming and optimizing.UMTS ask different kinds of service for different users. At the same time, it also requires a high service quality for all kinds of different business. Based on the full use of the wireless resources system, and also make sure the transmitted quality of the users'data, it is necessary to make a reasonable management and admeasure of the wireless resources. The research of the Scheduling Algorithm is the key point of the management of the wireless resources. In the fourth chapter of this paper, based on the mix traffic for WCDMA system, the author will do a research on the Scheduling Algorithm. Designing Scheduling Algorithm in multi-traffic WCDMA System must take channel condition into account, and differentiate the service to guarantee the demand of QoS, avoid the user's starvation,meanwhile try to improve the throughput and the fairness of the scheduling in the system as much as possible. Therefore, on the basis of PFS, we proposed a service differentiated proportional fairness scheduling algorithm (CQSSD-PFS) based on C/I, QoS, and starvation weight. It also introduced real time service and system capacitance compensate model. Simulation results showed that effectively insured all kinds of service's short-term and long-term fairness and the throughput of the system.In a word, the article provides a theory gist for the mix-traffic UMTS system's network modeling, traffic modeling and wireless source management...