UAV-assisted Communication Channel Resource Allocation Algorithm Research And Test Platform Development

As the technology of drones matures,drones are increasingly used in social and economic activities.Among them,the unmanned aerial vehicles(UAVs)are equipped with communication base stations to form a UAV network in the air,and assist ground communication,which is an important scenario for UAV applications.The UAV network can offload the traffic of the ground networks,thereby reducing the load pressure of the ground network.This paper studies the channel resource allocation scheme of UAV network to improve the resource utilization of UAV network and increase the average link capacity of the network.Meanwhile,the open source software radio platform GNU Radio and its Universal Software Radio Peripheral(USRP)are used to develop an experimental platform that verifies the performance of UAV networking,providing relevant researchers with flexible and efficient experimental research tools.The specific research results are as follows.1.A channel allocation algorithm based on greedy algorithms is proposed to solve the problem of effective channel resource allocation under UAV network-assisted communication.For the purpose of suppressing interference and balancing the load,the best network resources are allocated to ground users.For probabilistic line-of-sight(LoS)or non-line-of-sight(NLoS)communication links between UAVs and ground users,we use probabilistic model to model the air-to-ground link propagation model and measure the co-channel interference and link load of the link between the ground node and the UAV node.On this basis,an optimization model is established.The Lagrange multiplier method is used to transform the constrained optimization problem into an unconstrained optimization problem.Then a centralized channel allocation algorithm based on greedy algorithm is proposed.And through simulation,the effectiveness of the algorithm is verified and analyzed.2.We developed a flexible,easily expandable,and programmable UAV network test and verification platform.The platform is developed and implemented based on GNU Radio and USRP hardware peripherals.The system includes functional modules such as network management,MAC layer,physical layer,and data interface management.By configuring analog access point(AP)services,the management module is developed to realize the function of system assisting ground communication.The system uses threads and inter-thread communication technology to ensure the independence and data interaction between modules at various levels,which ensures the flexibility and scalability of the system.Finally,the platform system was tested,and the test results showed that the test platform reached the design goal.