On outage performance of IRS-assisted wireless communication with user mobility following RWP model

An intelligent reflecting surface (IRS)-assisted wireless communication system with user mobility following random waypoint (RWP) model is investigated, where the user receives the reflection signal from the IRS controlled by the access point (AP) via a programmable controller, and the IRS is mounted on an unmanned aerial vehicle which is only an auxiliary device to enable IRS reflection communication at a certain altitude. As user moves, the AP makes the reflected beamforming of the IRS following with the user through coding the unit-element of the IRS. To investigate the effect of joint IRS feature and user mobility on the outage performance, the cumulative distribution function of the received signal-to-noise ratio of the mobile user is first derived and then the close-form expression for the outage probability is obtained. Numerical simulations are performed to validate the accuracy of the analytical results. The solutions are also compared with that for conventional amplify-and-forward relay system. Insights are drawn related to the number of meta-surface elements, and the maximum activity radius of mobile user.