Research On Service Providing-oriented Logical Carrying Network Construction

While traditional network architecture, which is traffic-oriented, has been constructed for carrying special traffic and then reconstructed for integrating new types of traffic. In the new generation network, the functions of network have changed from connecting hosts and traffic transferring to abundant service providing. To expand the carrying service capability of network core node equipments, and to meet the requirements of making the network controllable, manageable and operational, "New Generation of Trustworthy Network" of the National High-Tech Research and Development Program of China (863 Program) launches the project of "Research of Reconfigurable Component Router ". Based on Component and reconfigurable technology, new type of service providing-oriented technology architecture is emerging. Providing scalable network-carrying capability and meeting the widening different requirements of all kinds of network traffic are the goals of this architecture, the key of which is to bring out new network-n struction methods. So based on reconfigurable router this thesis is focused on the construction of logical carrying network.Combining the advantages of traffic-oriented network with virtual network construction methods, a kind of universal carrying network architecture is presented. And this thesis focuses one problem- research on the construction of logical carrying network. The influence of allocation equilibrium of network resource on construction efficiency is also studied. The results of above researches can be applied into the project of "New Generation of Trustworthy Network". This paper includes the following aspects:1.Firstly by analyzing the current network construction methods, which is traffic-oriented construction and virtual network construction , virtual network construction is considered as being able to support the diversity of network traffic and taking on the characteristics of flexibility and scalability. Network virtualization has become one direction of network development. By summarizing and analyzing ongoing network virtualization research projects, such problems as strict restriction and load unbalancing are found to influence the performance and efficiency of network construction. So, these methods can't be adopted in the carrying network construction which is based on router.2. Aiming at the characteristics of rapid development of network traffic and current network architectures, universal carrying network architecture based on reconfigurable routing & switching platform is brought forward. It presents a universal developing mode of next generation network. This chapter introduces the hierarchy and working principles as well as key technologies of this architecture. It is shown that the service providing-oriented architecture can provide better carrying service capability for both current and most future network traffic.3. Stress-based construction algorithm (SCA) is studied for logical carrying network (LCN) construction. Most researches on virtual network may get into the bottleneck problem of physical network resource which comes from shortest path algorithm adopted in link mapping. By defining the parameters of Load Stress to show the network load, SCA is introduced based on stress balancing. SCA pays attention to not only the path attainability of LCN, but also the influence on the succeeding LCN requests. Simulation results indicate that this algorithm can improve the successful construction ratio of LCN and enhance the network service providing capacity.4. Path splitting based construction algorithm is studied in this chapter. Sometimes, there are plenty of resource fragments left when some LCN have been constructed. In order to fully utilize the physical network resource fragments, path splitting-based on-demand carrying network construction strategy is introduced to provide different resource to meet different service requirements. Base on availab le resource and current link load, an improved min-cost multi-commodity model is used to compute the resource allocation. Simulation results indicate that this algorithm can not only fully utilize resource fragments but also improve network service capability.5. An optimal construction algorithm is studied based on long time traffic load to solve the problem of dynamic LCN optimization. Parameter of long time traffic load is defined based on Sigmoid function to denote the influence of LCN residual runtime, which has not been paid attention to by static construction algorithms. Then, optimal reconstructing algorithm based on factors such as link utilization and residual runtime of LCN is studied. It can be seen from simulation and analysis results that logical carrying network construction is also a dynamic process in which resource distribution changes along with time. So dynamic adjusting according to need is necessary for LCN construction.6. A scheme of UCN implementation is given in the end. On the basis of analysis of LCN construction requests, layered management mechanism and feasible LCN construction course are presented. Furthermore, entities in UCN architecture are defined and configured. The design of this scheme will be beneficial to experiments of UCN which are service providing-oriented.