Research On Theories And Methods Of Logical Carrying Network Design Based On Reconfigurable Flexible Network

Over the past several decades, Internet technology has undergone a dramatic development and exhibited great vitality and broad prospects in communication applications. However, with the massive number of Internet users which are incrementally growing, a variety of network services, and the progression of China's national strategic plan of "triple play" deployment, the conventional network architecture can barely meet the needs of future Internet infrastructure development. Based on such recognition and in the context of technology innovation and development, this dissertation, which is supported by the task of "development of reconfigurable router components group" under the State 863 High Technology R&D Key Project "A New Generation of High-Trusted Network", aims to investigate the design and creation of logical carrying network architectures to meet the requirements of residential and business customers over the next-generation Internet underpinned by a reconfigurable routing and switching flexible network environment.In response to the aforementioned objectives, the philosophy of creation of logical carrying networks in a reconfigurable network environment as well as the design and implementation of the reconfigurable management system are specifically exploited. The major research areas are discussed as follows:This dissertation starts with a comprehensive review of future Internet technology development trend and strategic plans as well as the development of large-scale test-beds across the world. We present an integrated service-oriented network architectural design solution based on with the use of reconfigurable routing and switching equipments. Following that, the approach of logical network creation based on the framework of universal carrying network is presented in details with the overall network-wide optimization in mind.Secondly, it overviews the relevant literature of network virtualization and virtual network design methods, analyses the assessment metrics, network design strategies and methods of virtual networks, and describes two major methods of virtual network creation, namely the heuristic and the linear programming approach. Based on the existing methods, a comparative study is presented between the design of virtual networks and logical carrying networks. We pointed out two future research directions on virtual network creation by incorporating the network resources and energy efficiency into the consideration during network virtualization.In this dissertation, two creation methods of logical carrying networks in the context of homogenous flexible network environment using reconfigurable routing and switching equipment are introduced. The first approach addresses the logical carrying network design problem based on load balancing by decomposing the requirements into a set of meta-requirements with the aim to improve the accept ratio of creation requests and the global utilization of physical network resources. The second method is based on virtual routers as in core networks the bottleneck of building networks is the capacity of router node, rather than link capacity. The network evaluation demonstrates its superiority over the simple model and equilibrium model in terms of the accept ratio.Meanwhile, this dissertation introduces a method of creating logical carrying network over heterogeneous flexible network environment using reconfigurable routing and switching equipments. In the reconfigurable environment, we investigated the creation of different forms of heterogeneous networks, such as television broadcast networks, telecommunication networks, conventional data service networks and other new network types supporting future network applications. Whilst meeting the needs of network creation, it takes three major factors into the consideration, namely link multiplexing, the avoidance of subgraph segmentation and network-wide load balance. The suggested method could be able to efficiently create logical carrying networks in a heterogeneous network environment.In addition, under the conditions between bandwidth guarantee and bandwidth limitations, two design methods of large-scale flexible networks are introduced. Through adopting multi-commodity flow model, these methods could significantly enhance the network creation efficiency and reduce the time complexity through simplification so as to meet the needs in the large-scale network environment.Finally, the dissertation presents a logical carrying network emulation platform based on software virtual router "Click Modular Router". The implementation details, system model and module functions of the emulation platform are described. The process of experimental assessment involves the creation of a variety of logical carrying networks through reconfiguring the protocols supported by the ports of software virtual routers, the analysis of network performance in terms of throughput, packet loss rate through network monitoring and measuring tools, so as to validate the effectiveness of the simulation platform and the proposed algorithms.