Patent ID: 9681373
Date: 2017-06-13
CPC Classifications: H04W,Y02D

Claim:
1. A method for activating a wireless communication device, the method comprises: receiving, by the wireless communication device, a sequence of periodic transmissions; estimating, for each periodic transmission of the sequence of periodic transmissions and before a reception of the periodic transmission, an expected time of arrival of the periodic transmission; calculating, for each periodic transmission of the sequence of periodic transmissions, a timing difference attribute that is responsive to at least a difference between a timing of arrival of the periodic transmission and an expected time of arrival of the periodic transmission; selecting a selected periodic transmission out of the sequence of periodic transmissions, wherein the selected periodic transmission is associated with a smallest timing difference attribute out of the timing difference attributes associated with the periodic transmissions of the sequence of periodic transmissions; estimating, before a reception of a future periodic transmission that does not belong to the sequence of periodic transmissions, an estimated time of arrival of the future periodic transmission in response to the selecting of the selected periodic transmission and a periodic transmission period; determining a wakening time for wakening the wireless communication device by subtracting a safety period from the estimated time of arrival of the future periodic transmission; wherein a duration of the safety period decreases upon a successful reception of a set number of successive beacons; and wakening the wireless communication device at the wakening time and searching for the future periodic transmission.