Research On QoS Framework And Key Technologies Of Multimedia Services In Broadband Metropolitan Area Network

Intoday's Internet,QoS(quality of service)is a very important problem in Internet network,especiallyin broadband metropolitan area network.At present,the telecommunication network is evolving towards multi service,multi domain and multi vendor architecture.The deployment of multi service network has brought new challenges,including quality of service(QoS)and network policy control.We must give priority to network traffic,examine IP packets in detail,and determine which specific requirements must be guaranteed.Therefore,it is very urgent and practical to study the background of QoS technology in broadband man and analyze the characteristics of its important technology,and to establish a network architecture which can satisfy all kinds of multimedia services to ensure the transmission of all kinds of services.In the current QoS(quality of service)system,Diff-Serve TE is the main technology for bandwidth reservation for different traffic classes,and it is the focus of research in the QoS(quality of service)system.Aiming at this key technology,two algorithms for parameter calculation are proposed in this paper.The first approach begins with the definition of the key performance index(KPI),which aims to objectively quantify the QoS level for each of the required services;these together with traffic loads and network topology are used to find the best mapping of service types to category types and the best band width allocation for each type.The CoSt function can be used to express the optimality with the CoSt function weighting the expected satisfaction of the service target and the resource utilization rate of the network.The second method relies on genetic algorithm(GA)and aims at reducing the complexity of BC model configuration program.A new fitness function is defined to create a final genetic group,the solution set by the BC,to weigh the flow load changes of each link and the average length of the path.Through experimental simulation,we highlight the correct setting of these parameters and how to avoid network performance that does not meet the input service requirements.In order to solve these problems,a new system architecture is proposed after the analysis of existing broadband man's architecture and routing mode.The architecture reinstalls the relationship between the elements of QoS(RSVP,Multimedia Routing Protocol and sender and receiver),and causes failure in the original multimedia path.Create an alternate path.Through the simulation system,a set of broadband metropolitan area network architecture model is established to simulate the routing and transmission of various traffic flows in the metropolitan area network.By producing various simulation data input simulation systems,the running status of the new test architecture is tested.The simulation results show that the proposed system architecture is better than the old system architecture in the QoS parameters such as packet loss and delay jitter,and it solves the problem of the failure of the multimedia streaming transmission which is easy to occur in the old system.