Software Defined Wireless Networking Simulation Platform And Algorithm Design Based Air Interface Slicing Strategy

In order to meet a variety of vertical industry diversified business needs,network slicing has been widely concerned in the 5G.Network slicing can not only reduce the cost of network construction,but also to provide users with differentiated network services and to guarantee the various service needs of the business.Therefore,the network slice is a key technology with great research value in 5G.In addition,SDN is seen as an important way to achieve network slicing,which is becoming a hotspot in wireless network research.So,this thesis establishes a software-defined wireless network simulation platform,which realizes the network slicing of the wireless access network.The main contents and innovations of the thesis are summarized as follows:Firstly,this thesis introduces the overall architecture of the software definition wireless network simulation platform,as well as the main function modules and their specific design and implementation methods.Specifically,the function modules include an information collection module,a virtualization module,a resource management module,a slicing network management module and an SDN controller.Respectively,the information collection module is responsible for collection and analysis of network information;the virtualization module realizes the virtualization of network node and resource;the resource management module effectively allocates the bandwidth resources;the slicing network management realizes generation and dismantling of the network slicing;the SDN controller is responsible for the unified scheduling of each module above,to achieve interconnection and call between each module.Secondly,in order to realize the technical characteristics of the separation between control and forwarding in software-defined network,this thesis designs a slice table for wireless access network.The slice table mainly includes the identification of the network node,forwarding port and various network parameters.The SDN controller can realize the generation and dismantling of the slice network by configuring and modifying the slice table.On the other hand,in order to solve the interaction between the SDN controller and the network node,this thesis designs the slice message to realize the communication between them.And the connection process and workflow between them are described.Finally,to realize the dynamic allocation of network resources,improve the network resources utilization and meet the demand of the diverse networks,this paper proposes a virtual resource allocation algorithm based on network utility maximization.The algorithm uses the spectrum resource as the revenue and commercializes the differentiated price according to slicing networks.It also takes the computing resources and the backhaul as the cost,and also takes into account the different demands of the slicing network on the computing resources and spectrum resources.Finally,the utility model is established to maximize the network revenue.And a distributed iterative algorithm is designed to solve the utility model by Lagrangian dual decomposition.The simulation results show that the algorithm improves the percentage of service users and maximizes the network revenue.