US 11,838,814 B2
Handover management with conditional handover in communication systems using unlicensed frequency bands
Henry Chang, San Diego, CA (US); and Masato Fujishiro, Yokohama (JP)
Assigned to Kyocera Corporation, Kyoto (JP)
Appl. No. 17/262,117
Filed by Kyocera Corporation, Kyoto (JP)
PCT Filed Aug. 6, 2019, PCT No. PCT/US2019/045230
§ 371(c)(1), (2) Date Jan. 21, 2021,
PCT Pub. No. WO2020/033360, PCT Pub. Date Feb. 13, 2020.
Claims priority of provisional application 62/716,713, filed on Aug. 9, 2018.
Prior Publication US 2021/0352544 A1, Nov. 11, 2021
Int. Cl. H04W 36/00 (2009.01); H04W 36/30 (2009.01); H04W 76/27 (2018.01); H04W 36/08 (2009.01)
CPC H04W 36/00837 (2018.08) [H04W 36/0079 (2018.08); H04W 36/08 (2013.01); H04W 36/30 (2013.01); H04W 76/27 (2018.02)] 24 Claims
OG exemplary drawing
 
1. A method performed at a communication device, the method comprising:
evaluating a first occupancy level of a first unlicensed channel to a serving gNB;
transmitting, in response to the first occupancy level being below a channel occupancy threshold, a measurement report over the first unlicensed channel to the serving gNB, the measurement report indicative of at least one of a received signal strength or a receive signal quality at the communication device of at least one received signal transmitted from a potential target gNB;
receiving, from the serving gNB, a conditional handover command associated with a handover time period established by the serving gNB;
evaluating a second occupancy level of a second unlicensed channel to a handover target gNB; and
initiating, when a handover condition is detected and within the handover time period, a handover procedure to the handover target gNB if the second occupancy level is below the threshold.