Patent ID: 10123194

Abstract:
A method comprises: a mobile tag receiving at least one first Bluetooth Low Energy message transmitted from each of at least two fixed tags, each first Bluetooth Low Energy message including at least an identifier corresponding to the respective fixed tag; the mobile tag measuring a radio parameter for each of the received first Bluetooth Low Energy messages; and the mobile tag transmitting a second Bluetooth Low Energy message including the identifiers of each of the fixed tags, the measured radio parameters associated with each of the received first Bluetooth Low Energy messages, and an identifier corresponding to the mobile tag, said second Bluetooth Low Energy message enabling the calculation of a position of the mobile tag by a server apparatus. A further method comprises: a Bluetooth receiver device receiving at least one second Bluetooth Low Energy message from a mobile tag; the Bluetooth receiver device decoding from the message identifiers of at least two fixed tags from which first Bluetooth Low Energy messages have been transmitted; the Bluetooth receiver device decoding from the message measured radio parameters associated with the first Bluetooth Low Energy messages; and the Bluetooth receiver device decoding from the message an identifier corresponding to the mobile tag; server apparatus retrieving position data corresponding to each of the fixed tags using their respective identifiers; and the server apparatus using the position data and the radio parameters included in the second Bluetooth Low Energy message to calculate a position of the mobile tag.