Research On Wireless Resource Slicing Based On Network Virtualization

There have been some problems with the development of mobile networks.On the one hand,the growing traffic demand of users leads to a shortage of spectrum.Heterogeneous networks,differentiated services,cognitive radio and other new access technologies can be used to solve the problem of low utilization of wireless resources to a certain extent.The use of a specific technology in isolation from others in traditional cellular network makes the network management and operation more complex,operators need to pay more to deploy a large number of infrastructure.On the other hand,the popularization of intelligent mobile phones and mobile devices,a wide range of broadband applications and services as well as the development of Internet of Things,virtual reality and other technologies show higher capacity and diverse needs.Network slices are effective solutions to these problems,which is defined as the end to end logic network in a broad sense.It is a wireless network virtualization technology which combines SDN with NFV.The spectrum resource,the protocol module,the hardware infrastructure and the shared cache service function are used as the basic elements to be arranged and reorganized to form the virtual wireless network.Therefore,this paper focuses on the segmentation and isolation of wireless network resources,and explores the design method of the new architecture of wireless cellular network and the strategy of virtualized wireless slice scheduling.Specific work is as follows:(1)Due to the fact that the slices of the access network side protocol stack and the radio frequency unit have not yet been conclusive.Therefore,this paper presents an application architecture of customized wireless network slices for a 5G vision based on a common design architecture.The efficient integration of SDN and NFV brings great commercial value to the proposed wireless network architecture.(2)The two-layer scheduling algorithm based on the NVS architecture is more flexible than the fixed slice to achieve the optimal resource utilization.According to different operators' SLA to provide corresponding ratio,The flow level slices of MAC laminar in LTE protocol stack are customized to go on to allocate wireless virtual resource,different scheduling strategies for real-time and non real-time services are adopted to meet their QoS requirements,which increases the packet loss rate and throughput of the system.(3)It is proposed that the slice scheduling and the user cooperative interaction under different slices are proposed in the D2 D cooperative incentive scenario.To set up the slice reputation label generated by the cooperation incentive,the slice will not be compensated by the user's own cooperative behavior,and promote the efficiency of the spectrum.(4)Based on the "super base station" of the Chinese Academy of Sciences,this paper constructs its own resource slices for different operators.According to the combination with the virtual base station control module on the existing super base station,it is completed that the super-base station virtualization of access side base stations.It is verified that the slices of the two models are fixed and enhanced,and the corresponding slices of different operators can meet the requirements of the preset basic rate and obtain the maximum resource utilization.