Research On Resource Allocation Technology In OFDMA Wireless Mesh Network Virtualization

Wireless mesh network,as a Multi-hop network,has numerous advantages such as easy installation and deployment,Non-line of sight transmission(NLOS),stable and robust performance,flexible and diverse structure,and high-bandwidth services.And it has huge application prospects in many fields such as digital campuses,new hospitals and enterprises institutions,smart homes,disaster relief or battlefield networks.However,subject to the current large-scale network,the difficulty of operation and management of wireless mesh network is increasing year by year,and high-performance services are difficult to guarantee.Network virtualization(NV)technology allows network services to view and manage network resources in a manner that is independent of the underlying physical infrastructure,provides on-demand heterogeneous web services,and enables flexible and dynamic resource management.The application of virtualization technology in wireless mesh networks can effectively solve the current network defects and improve network performance.This paper focuses on the research of virtual request access and resource allocation technology with guaranteed Qo S in OFDMA wireless mesh networks.First,the development and concept of virtualization technology are introduced.The structure and system model of wireless mesh network are introduced and virtualization technologies commonly used are investigated.Secondly,according to the fading characteristics of the wireless channel,a finite state Markov model is established.Then,the channel state information of the wireless channel is predicted,and the value and probability distribution of the SNR state in any time slot are obtained.On this basis,the theory of effective capacity and effective bandwidth is introduced and its model is introduced into the queuing model and analyzed,and its expression formula is deduced.Then,this paper introduces the basic principle of the particle swarm algorithm,and according to the virtual request access problem studied in this paper,proposes a virtual request multi-route routing access scheme based on the particle swarm algorithm.In the process of accessing a virtual request,this paper hopes to access more virtual requests while ensuring Qo S constraints.Since the allocation of physical sub-channels and the mapping algorithm for virtual requests will affect system performance,the solution to the problem is a very complex cross-layer hybrid nonlinear programming problem.In this paper,the complex problem is divided into two sub-problems.The problem of physical layer resource allocation and the problem of virtual request access are completed respectively.A two-layer dynamic interaction algorithm is proposed to solve the original problem.In the physical layer subchannel resource allocation process,according to the effective bandwidth request of each link on the physical network,subchannel resources are allocated according to a fairness criterion.In the virtual request access process,the virtual request on the physical link are measured through the concept of effective bandwidth,and the virtual requests are accessed according to the load balancing manner.The two layers are not independent of each other,but each information is exchanged and coordinated after each allocation.When the physical layer resource matrix is certified,it indicates that the best physical layer resources have been obtained in the allocation mode.Finally,this paper simulates the proposed virtual request mapping mechanism in terms of access rate,link utilization and delay characteristics,and the effectiveness and superiority of the algorithm is verified.