The Research Of Resource Allocation Strategy In Wireless Network Virtualization

With the rapid development of wireless communication technologies and the sharp increase in the demand for wireless services by users,there are many drawbacks in the current internet.An effective means has been provided to solve current network problems by wireless network virtualization technology.Based on the idea of sharing,wireless network virtualization abstracts and centralizes network resources,ignores the differences between the underlying physical networks and differences between wireless communication technologies,and enables flexible configuration of network resources.This thesis mainly focuses on resource allocation in wireless network virtualization.At present,most wireless network virtualization resource allocation algorithms mainly focus on bandwidth and CPU resource allocation problem.However,the problem of power resource allocation has not been studied extensively.In wireless network virtualization,virtual nodes of different virtual networks are allowed to co-exist on the physical nodes of the same physical network to dynamically share power resource.Therefore,in this thesis,the power resource allocation problem is defined as a mathematical problem with multiple optimization objectives and multiple constraints.And the model of supply and demand in economics is used to maximize the revenue of various parties at different levels.The designed price update function is used to find equilibrium price of unit power.A power resource allocation algorithm based on model of supply and demand is proposed in this thesis,which realizes the optimal power resource can be allocated to the users.The simulation results show that the proposed algorithm improves the network revenue and the average transmission rate.In addition,due to the random arrival and departure of the virtual network requests and the dynamic nature of the underlying physical network in the wireless network virtualization,this can result in unbalance of physical network load,which leads to a lower acceptance rate of subsequent virtual network requests and low resource utilization.Therefore,a virtual network re-embedding algorithm is proposed in this thesis.Whether to start the re-embedding mechanism is determined by the proposed algorithm according to the actual load status of the underlying physical network.The virtual network re-embedding is completed by considering the resource requests of the virtual nodes and links in the virtual network,the remaining service time of the virtual network,the links connection status of the virtual nodes,and the interference between the links.Experimental results show that the proposed algorithm improves resource utilization and acceptance rate of virtual network requests.