20-µs Accuracy Time-Synchronization Method using Bluetooth Low Energy for Internet-of-Things Sensors. - Masayasu Harada; Shintaro Izumi; Ryosuke Kozeni; Yukiko Yoshikawa; Toru Ishii; Hiroshi Kawaguchi 001; Shohei Uemura; Kaname Araki (CCNC, 2022)