“…Despite their low power consumption and long range, they are highly resistant to frequency selective fading and provide a sufficient indoor range. The usage of BLE tags on factory floors and in homes is increasing, so they are becoming very popular for tracking operations ( HajiAkhondi-Meybodi et al, 2021 , Mohaghegh et al, 2021 , Hajiakhondi-Meybodi et al, 2020 , Hajiakhondi-Meybodi et al, 2020 , Alexandrov and Monov, 2017 , Yen et al, 2021 , Huang et al, 2020 , Ye et al, 2022 ). So the Bluetooth 5.1 AoA indoor positioning technology has been proposed.…”