Research On Resource Allocation Algorithm For Wireless Network Virtualization

The development of wireless networking technology has brought a lot of convenience to people's life.With the ever-increasing network scale,increasing user demands,the rapid growth in the number of intelligent terminals and the development of some emerging technologies such as big data,cloud computing and Internet of things,the existing Internet architecture is no longer able to meet users' needs and the requirement of network technology.Wireless network virtualization technology,as the key to the next generation of network research,can abstract and manage the underlying physical network through ignoring the underlying physical network differences,thereby provide customized services for different types of networks.This paper studies a key issue in wireless network virtualization: resource allocation.This paper analyzes the advantages and disadvantages of the existing resource allocation algorithm,and the improved resource allocation algorithms are proposed.Multiple virtual networks of different service types can be shared on the same physical network.Dynamic arrival and departure in the virtual network lead to imbalance of the physical network load.To solve this problem,a theoretical analysis model is established,and a Re-embedding Algorithm for Virtual Node Resource(RAVNR)in wireless network virtualization is proposed.The influence factor is defined in this algorithm considering the influence of nodes and links on the physical network load in the virtual network,and the re-embedding of virtual node resources on the assumption of load balancing is performed.Simulation results show that the proposed algorithm can not only reduce the cost of virtual network embedding,but also improve the utilization efficiency of physical network resources and the acceptance rate of virtual network requests.For most of the current research work in the process of virtualized resource allocation,only the fixed resource request of virtual network in its life cycle is considered,while ignoring the fact that the terminals' randomness and freedom will cause the size of resource request changeable,therefore,a Dynamic Allocation Algorithm based on Spectrum Resource Sharing(DAA-SRS)is proposed.The algorithm divides the virtual network request into two parts: the basic resource request and the variable resource request.The basic resource requests support basic service of the virtual network,while the variable resource requests support the additional requirement.The basic resource requests corner resource and the variable resource requests share the resources in an opportunistic sharing way in their life cycle.Finally,the load balancing mechanism is proposed for the dynamic of the virtual network.Simulation results verify the effectiveness of the proposed algorithm.