Research On User Offloading Technology Based On Next Generation Wireless Communication

In some environments with a large number of users,high device density,high user traffic and complex signal environment,the unbalanced spatial and temporal distribution of terminal devices can lead to load imbalance of the network,while the communication quality of users will be decreased.WIFI offload technology can transmit the communication load originally carried on other communication networks and effectively drive the load balancing of the network.The WIFI offload technology is now mature,but research on the integration of WIFI offload technology with key technologies for next-generation wireless communications is not yet complete.For example,the issue of user fairness is ignored when studying WIFI offloading technology for Unmanned Aerial Base Station(UABS)communication scenarios in the 6th Generation Communication Technology(6G).When studying the Multi-AP collaborative communication technology in WIFI 7 and the user seamless roaming technology in the Ultra-High Reliability(UHR)standard for continuous evolution of WIFI 7,the problem of load imbalance of wireless access points(APs)and wasted resources of low-load APs is ignored.Therefore,this thesis focuses on WIFI offloading techniques in UABS communication scenarios in 6G and collaborative user offloading techniques in Multi-AP scenarios in WIFI 7.(1)Research on WIFI offloading technology in UABS scenario in 6GIn the scenario where the cellular base station is destroyed,combining the WIFI offloading technology with the UAV communication technology in the 6G communication scenario can provide normal service to users in emergency scenarios as well as effectively reduce the load of the UABS network through the WIFI offloading technology.A WIFI offloading model is developed considering user fairness to maximize the minimum user capacity by jointly optimizing WIFI offloading,UABS location and spectrum allocation.The problem is a complex nonconvex problem.In order to solve the problem,the block coordinate descent method is introduced in this thesis,which splits the total problem into three subproblems and solves the subproblems in alternating iterations.The results of the block coordinate descent method are compared with those of the exhaustive algorithm,and the comparison results show that the algorithm used in this thesis can approach the optimal solution with low computational complexity,and the simulation results also prove that the scheme can effectively increase the capacity of cellular users.(2)Research on Collaborative User Offloading Techniques under Multi-AP Scenarios in WIFI 7In a high-density user scenario with dense AP distribution,the WIFI offload technology is combined with the Multi-AP collaborative communication technology in WIFI 7 and the seamless user roaming technology in the WIFI 7 Continuous Evolution UHR working group to solve the problem of unbalanced AP node load due to unbalanced spatial and temporal distribution of end devices.Under the simultaneous consideration of WIFI offloading energy consumption,network capacity,and WIFI offloading cost,a utility function is established for sub-APs based on the master-slave Multi-AP architecture,and the user offloading problem among APs is modeled as a game-theoretic problem to be solved.It is verified through simulation that the scheme can effectively drive load balancing among AP nodes and increase the user capacity within the subAP service set.This thesis also illustrates the complete process of MultiAP cooperative user offloading,which will hopefully provide some new ideas in the development of WIFI 7 standard and WIFI 7 continuous evolution standard.