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1. (WO2018046792) SYSTEM AND METHOD FOR SAVING ENERGY IN A LOCATOR APPARATUS

Pub. No.:    WO/2018/046792    International Application No.:    PCT/FI2017/050601
Publication Date: Fri Mar 16 00:59:59 CET 2018 International Filing Date: Tue Aug 29 01:59:59 CEST 2017
IPC: G01S 19/17
G01S 19/34
H04B 17/318
H04W 4/02
H04W 72/04
G01S 5/00
Applicants: EMERGENCE OY
Inventors: ARRAKOSKI, Jori
Title: SYSTEM AND METHOD FOR SAVING ENERGY IN A LOCATOR APPARATUS
Abstract:
Disclosed is a method for saving energy in a locator apparatus, wherein the locator apparatus comprises a movement detector, a satellite positioning device, a group of communication channels comprising at least two communication channels, a battery, means for harvesting energy and 5 a processor comprising a memory, said memory storing allowed position of the locator apparatus as a function of time and a set of instructions for performing a location update, the method comprising calculating an update threshold as a function of energy available in the locator apparatus, movement detection and location detection; performing a 10 location update when the update threshold is exceeded; and transmitting the location update to a server, using a selected communication channel, the selection being based on energy efficiency of the communication channel at the time of the transmission, wherein the energy efficiency is determined by measuring received signal strength from each 15 communication channel; adding a predefined protocol overhead to an amount of data of the location update to be transmitted, to obtain an actual amount of data of the location update to be transmitted, for each communication channel; performing a conversion from the actual amount of data of the location update to energy required for transmission using 20 each communication channel; and selecting the communication channel having the lowest requirement of energy for transmission.