Research On Multi-service Access And Handover Scheduling Mechanism Of Industrial Internet Based On 802.11ax

IEEE 802.11 ax,as a new generation of wireless local area network(WLAN)standard,has great development potential for multi-service access in industrial WLAN with its characteristics of low-cost,quickdeployment and high-efficiency.However,it still faces the problem of quick and efficient access point(AP)seamless handover for multi-service communications due to terminal mobility and channel degradation.To solve the problem,combining the characteristics of orthogonal frequency division multiple access(OFDMA)technology and multi-user multiple-input multiple-output(MU-MIMO)technology,this paper proposes a multi-service access and handover scheduling mechanism in industrial Internet based on 802.11 ax.This mechanism solves the above problems from two aspects:multi-service access and handover scheduling.From the point of view of multi-service access,this paper puts forward the channel resource allocation method and access architecture,optimizes resource allocation for service attributes,and increases the security of terminal access.From the perspective of handover scheduling,this paper expands the application of the architecture and resource allocation method,optimizes the acquisition of handover information by means of edge computing to reduce the time required for handover.Also,It optimizes the design for handover trigger decision and multi-objective handover to achieve efficient seamless handover.In detail,this paper proposes a multi-service access and bearer mechanism based on channel resource allocation.Among them,A channel resource allocation method based on QoS is proposed to match different service requirements and realize the bearers of multi-service.In addition,combined with the distributed authentication characteristics of blockchain,this paper proposes a distributed authentication mechanism based on blockchain,constructs a decentralized wireless trusted collaborative access architecture and a decentralized wireless trusted access authentication mechanism integrating 802.11 ax.Simulation results show that the proposed mechanism optimizes the allocation of channel resources matching the service attributes,ensures the access security of service terminals and reduces service transmission delay.Secondly,a seamless handover mechanism for multiple services is proposed,which consists of a channel scanning delay optimization method based on virtual AP sentinel,a handover trigger judgment algorithm considering mobility and resource reallocation,a multi-objective optimized AP handover model considering load balancing,transmission rate optimization and handover cost minimization with service attributes.This paper proposes a multi-service AP seamless handover algorithm based on improved particle swarm optimization(PSO)and genetic algorithm to solve it.Simulation results show that the proposed mechanism can reduce the handover delay significantly while realizing the optimization of seamless handover accurately in multi-service industrial WLAN.