Various speed scenarios such as high-speed travelling trains and connected drones over ultra-dense heterogeneous networks (HetNets) may result in a large number of handovers (HOs). which may cause further mobility challenges. Therefore. mobility robustness optimization (MRO) function has been proposed to contribute for detecting and correcting the mobility issues including too late HO. https://storeanimalwiz.shop/product-category/door-protectors/