Dynamic deployment method of low-altitude mobile base stations to enhance the security of wireless network physical layer

Abstract

The invention discloses a method for dynamically deploying low-altitude mobile base stations that enhances the security of the physical layer of a wireless network. The method establishes a coordinate system with the ground user as the coordinate origin, and the aerial platform locates the ground eavesdropper, obtains its position relative to the coordinate origin, and then establishes a mathematical problem of air platform position optimization under the constraints of the flight airspace, and based on the geometry of the problem Attributes and equivalent transformations are solved step by step. The solution method is as follows: first obtain the optimal flight height, then simplify the problem into a quadratic fractional programming, then equivalently transform into a quadratic programming, then equivalently transform into a semidefinite relaxation problem, and finally transform into a convex The semidefinite programming of , which can be solved using the semidefinite programming algorithm. The invention transforms a complex non-convex dynamic position optimization problem into a simple convex semi-definite programming problem, provides simple solution steps, is easy to implement, and can significantly increase the probability of non-zero secret rate.

Description

technical field [0001] The invention mainly relates to the technical field of communication, in particular to a method for dynamically deploying low-altitude mobile base stations that enhances the security of the physical layer of a wireless network. Background technique [0002] Due to the characteristics of on-demand deployment and low deployment costs, cellular mobile communication based on low-altitude aerial base stations has been widely used in the field of commercial communications, such as emergency response, search and rescue, reducing base station traffic load, and natural disasters. Post-communication services are rapidly reestablished and so on. However, the widespread application of this communication method faces an important problem—information security, that is, how to protect private information from being eavesdropped. To deal with this problem, physical layer security is considered to be a very promising technology. The physical layer security can flexib...

AI Technical Summary

Problems solved by technology

However, accurate channel state information, especially the channel state information of eavesdroppers, is difficult to obtain in many cases. In this case, it is not feasible to optimize the secrecy rate in real time to improve information security

Images