	US 12,231,208 B2
	Determining uplink default beam for multiple-input multiple-output (MIMO)
Fang Yuan, Beijing (CN); Yan Zhou, San Diego, CA (US); Wooseok Nam, San Diego, CA (US); Mostafa Khoshnevisan, San Diego, CA (US); Tao Luo, San Diego, CA (US); Xiaoxia Zhang, San Diego, CA (US); Jing Sun, San Diego, CA (US); and Juan Montojo, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Appl. No. 17/909,985
Filed by QUALCOMM Incorporated, San Diego, CA (US)
PCT Filed Apr. 8, 2020, PCT No. PCT/CN2020/083804 § 371(c)(1), (2) Date Sep. 7, 2022, PCT Pub. No. WO2021/203315, PCT Pub. Date Oct. 14, 2021.
Prior Publication US 2023/0101444 A1, Mar. 30, 2023
Int. Cl. H04B 7/0404 (2017.01); H04B 7/06 (2006.01)

CPC H04B 7/0695 (2013.01) [H04B 7/0404 (2013.01)]

16 Claims

1. A method for wireless communications by a user equipment (UE), the method comprising:

determining a default uplink beam to use for a physical uplink shared channel (PUSCH) before receiving a radio resource control (RRC) configuration for an uplink transmission configuration indicator (TCI) state list;

using the default uplink beam for transmitting the PUSCH; and

deactivating the default uplink beam for the PUSCH in response to receipt of signaling that configures a single TCI state for a control resource set (CORESET) and with a field set to a value that indicates a TCI field is not present in a downlink control information (DCI).