Research On Traffic Differentiation And Services Provision In Label Switching

Informationization is becoming one of the most important characteristics of the global economic development. Business grows with its applications developed based on the Internet. Networks, especially the Internet, are evolving to be the largest platform of information exchange. Besides, the rapid development of multimedia technology speeds up the dramatic extension of the Internet. The emerging network based multimedia applications and the ever growing traffic volume of multimedia also help the Internet transforms from the traditional data network to an integrated network that can deliver data, audio, video and other multimedia information. With the number of end users and types of applications increasing, more demand is imposed upon the Internet. QoS guarantee is one of the difficult research issues remaining unsolved. And the label switching technology is a proper solution to that problem. This dissertation focuses on the research on the key technologies for QoS guarantee based on label switching mechanism, covering two aspects of traffic differentiation and identification, and services the networks providing for the users. The research work in this thesis comprises three parts.As the main body of the first part of research, Chapter 2 addresses the way of classifying users' traffic, which is the primary phase for QoS provision. Traffic is grouped as long-flows and short-flows, in IP switching, with different ways of transferring. Since most classification methods only resolve the connections in the network level and are somewhat coarse in granularity, the author proposes a scalable traffic classification algorithm with finer resolving granularity that can dynamically differentiate end-to-end session from packet flows. The performance of the algorithm is verified both in theory and simulation work. In MPLS, traffic is divided as FECs. Through combinations of the information fields such as destination address, source address, destination port number, source port number, and TOS, within the IP header versatile methods of classification and identification can be obtained. But most schemes available now only consider single one of the two aspects, the demand of users and the efficiency of the network resource. So a new traffic classifier named OTC is presented with performance analysis and simulation verification to take both sides of request into account. Services provided by the networks to the identified traffic are the realization of QoSguarantee, which is discussed as the second research part of this dissertation. This second part consists of the study of bandwidth allocation and that of service architecture, discussed in Chapter 3 and 4 respectively. Chapter 3 focuses on the bandwidth resource apportioning. An adaptive algorithm is put forth for the bandwidth allocation for a single flow. Simulation using real traffic data of the Internet shows that the algorithm satisfies the users' QoS demand while consuming minimum amount of network resource. In the second half of this chapter, a new service PSP simulating the Premium Service is proposed. The author suggests a bandwidth adjustment algorithm named CLAN and a web based access control method WACM to construct a framework for end-to-end QoS guarantee. The performance is analyzed using the models of token bucket and queueing systems and tested by network-simulator software. In Chapter 4, a survey of the current service architectures such as the InteServ and the DiffServ is first presented. Then a new kind of service architecture STSA based on the market and price mechanism is put forward with emphasis on proposal of a brand new service means named P service. This kind of service differs from those available in a manner of "Serve First, Charge Second", i.e., the network will provide not intensively a proper service to the users and charges them according to the measurement based performance of the service the users received. We demonstrate different applications of the new service by simulation.The final part of this thesis, with respect to MPLS, compos...