Virtual Customized Network Technology In Wireless Access Networks

The future wireless communication network will pay more attention to enhance users'Quality of Experience (QoE) by exploiting service-oriented technique. However, it poses a huge challenge for the existing wireless communication networks to accommodate this trend. First, the coexistence of multi-networks would be a normalcy in the future wireless communication network. New network management and control methods are indispensable to achieve efficient compatibility among diverse types of network. Second,the future wireless networks should start from the service-oriented perspective to meet the diversified requirements of different applications, and provide on-demand service capabilities. Based on SDN (Software Defined Networking) and NFV (Network Function Virtualization), virtual customized network technology will be committed to the aforementioned demands.As the extension and expansion of SDN technology, SDT(Software Define Topology)and SDP(Software Define Protocol) technologies will become the most impressive technologies in the next generation of mobile cormmunication network (5G). Solving the SDT and SDP technical problems is of paramount importance to network resource utilization, QoS, user equipment (UE) QoE, and programmability of functional modules.In this thesis, we focus on the virtual custom network technology for wireless access networks. First, we study 5G network architecture based on SDN technology. Second,under the SDT and SDP based network architecture, we investigate the radio access problems to further enhance the network performance and the UE QoE. Our research includes the following two main issues:(1) The virtual service gateway deploy mechanism in the wireless access networks based on SDT technology. In the wireless access network deployment, regardless of the virtual service gateway instantiated location may lead to inefficiency of traffic aggregation and traffic engineering, as well as the high loss of network resources. We theoretically analyze the instantiated location aware virtual service gateway deployment problem in wireless access networks, and propose a two-step optimization scheme for the virtual service gateway deploy mechanism, including AHP and genetic algorithm.Simulation results show that the proposed scheme can effectively reduce the consumption of network resources and improve the network throughput.(2) The virtual protocol stack mapping mechanism in wireless access networks based on the SDP technology. SDP technology fulfills the customization and programmability of data processing protocol stacks by employing platform virtualization and functional modularization. In the virtual protocol stack mapping mechanism, the network performance is very sensitive to the selection of mapping area and the specific mapping algorithm. Therefore, we design a reasonable mapping area selection scheme, and propose a legacy algorithm and an improved ant colony algorithm to implement the virtual protocol stack mapping algorithm. We use Matlab to simulate the mapping mechanism for virtual protocol stack, and the results show that the virtual protocol stack mapping mechanism can effectively meet the diversity requirements of UE, improve the success rate of UE requests, and reduce the consumption of network resources.