Research On Mapping Strategy In Wireless Networks Virtualization

With the development of wireless communication,the network data and intelligent terminal appear explosive growth.Different heterogeneous networks exist in one network.However,because of the rigidity of traditional network technology.The emergence of wireless network virtualization technology enables wireless network resources to be managed and distributed uniformly after abstraction and isolation.This paper mainly studies the virtual network mapping problem in wireless network virtualization,which also belongs to the category of resource allocation,aiming at static and dynamic resource allocation.A mapping algorithm is proposed.First of all,the current mapping scheme of virtual network is optimal,but with the left part of the virtual network mapping scheme,before may lead to an increase in the waste of resources and the cost of mapping,so to solve this problem,this paper presents a mapping strategy algorithm based on link load capacity(MSA-LLC).According to the amount of surplus resources in physical link,a mapping strategy algorithm is proposed in the tolerant time of virtual network.That is,immediate mapping and delay mapping,establishing the objective function with minimum cost,so as to realize the effective utilization of resources and accept more virtual networks.The simulation results show that the MSA-LLC algorithm improves the acceptance rate of the virtual network,increases the utilization of physical resources,and reduces the mapping cost of the virtual network.Then,for dynamic resource allocation,because the virtual network arrive and leave dynamically,the partial load of the physical network may be unbalanced,which will have a certain impact on the acceptance of the virtual network in the future.In this paper,a remapping algorithm named remapping algorithm for wireless network virtualization is proposed(RA-WNV).The algorithm considers the problem of load imbalance,remaps virtual nodes and links according to load imbalance.In the process of remapping,the cost of service interruption caused by remapping,the lifetime of virtual network and the size of resource request are fully considered,and the load balance of physical network is realized with the minimum remapping cost.The simulation results show that the algorithm reduces the mapping cost,accepts more virtual networks,increases the utilization of resources and realizes the efficient utilization of resources.