US 12,262,322 B2
Wakeup communication in a wireless communication system
Henrik Sjöland, Lund (SE); and Leif Wilhelmsson, Lund (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/780,178
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Dec. 2, 2019, PCT No. PCT/EP2019/083293
§ 371(c)(1), (2) Date May 26, 2022,
PCT Pub. No. WO2021/110233, PCT Pub. Date Jun. 10, 2021.
Prior Publication US 2022/0417852 A1, Dec. 29, 2022
Int. Cl. H04W 52/00 (2009.01); H04B 1/40 (2015.01); H04W 52/02 (2009.01); H04W 76/28 (2018.01)
CPC H04W 52/0229 (2013.01) [H04B 1/40 (2013.01); H04W 76/28 (2018.02)] 14 Claims
OG exemplary drawing
 
1. A wireless communication device comprising:
a first transceiver comprising a first frequency synthesizer which comprises a first digitally controlled oscillator and a crystal oscillator;
a second transceiver comprising a wakeup receiver, a second transmitter and a second digitally controlled oscillator connected to the wakeup receiver and second transmitter; and
a control unit configured to control operation of the wireless communication device;
wherein the second transmitter is configured to transmit periodically a signal to a base station, the signal is modulated by a code identifying the wireless communication device and transmitted at a frequency set by the second digitally controlled oscillator.