Relay unmanned aerial vehicle flight path planning and user access combined optimization method

Abstract

The invention relates to a relay unmanned aerial vehicle flight path planning and user access combined optimization method, which introduces an unmanned aerial vehicle with a storage function as a mobile relay unmanned aerial vehicle, and performs combined optimization on relay unmanned aerial vehicle flight paths in a multi-cell network and access strategies of cell edge users, thereby maximizingthe information transmission rate of the cell edge users. The method comprises the following steps: firstly, constructing an edge user and rate maximization problem, fixing a user access matrix, converting a flight path planning sub-problem into a convex problem through a method of solving upper and lower boundaries through scaling, and solving to obtain an optimal unmanned aerial vehicle flightpath; then, fixing the flight path of the unmanned aerial vehicle, and obtaining an optimal user access matrix by solving a Lagrangian pair-occasional function; and finally, iterating the above stepsto alternately optimize the flight path of the unmanned aerial vehicle and the user access matrix until the iterative algorithm converges. According to the method, optimization of the flight path of the unmanned aerial vehicle and user access in the multi-cell relay network is comprehensively considered, and the information transmission rate of multi-cell edge users in the wireless communication network is effectively improved.

Description

technical field [0001] The invention relates to an efficient joint optimization method for relay UAV track planning and user access, which belongs to multi-cell UAV relay communication technology. Background technique [0002] UAV communication is a new type of communication scenario. Due to its high-speed mobility and flexibility, UAV-assisted communication will have broad application prospects in improving network performance. On the one hand, the higher flying altitude of UAVs increases the probability of establishing a line of sight (LoS) link between UAVs and ground equipment, which will further bring about higher communication rates, lower latency and other performance improvements. ; On the other hand, the mobility of drones facilitates their rapid deployment according to dynamic network changes to optimize network performance. At present, there have been many studies on the application scenarios of UAVs: UAVs can be used as mobile base stations in the air to establ...

AI Technical Summary

Problems solved by technology

[0005] Technical problem: In order to solve the problem of user communication quality optimization in the common edge coverage area of ​​multiple cells, this invention proposes an efficient joint optimization method for relay UAV track planning and user access, and obtains the upper and lower bounds by scaling , jointly optimize UAV trajectory and user access, and achieve efficient communication under the premise of satisfying information causality

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