US 12,348,463 B2
Frame structure design for downlink TDD-TDD carrier aggregation with pusch-less cell
Bo Chen, Beijing (CN); Mingkai Nan, Beijing (CN); and Alexei Yurievitch Gorokhov, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Appl. No. 17/917,546
Filed by QUALCOMM Incorporated, San Diego, CA (US)
PCT Filed Apr. 23, 2021, PCT No. PCT/CN2021/089366
§ 371(c)(1), (2) Date Oct. 6, 2022,
PCT Pub. No. WO2021/218824, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. PCT/CN2020/087537 (WO), filed on Apr. 28, 2020.
Prior Publication US 2023/0171080 A1, Jun. 1, 2023
Int. Cl. H04L 5/00 (2006.01); H04L 5/14 (2006.01)
CPC H04L 5/1469 (2013.01) [H04L 5/001 (2013.01); H04L 5/0051 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A method of operating a user equipment (UE) in communications with a base station (BS), comprising:
performing downlink and uplink with the BS using a primary frame on a first time-division-duplexed (TDD) band of a primary component carrier (PCC), wherein the primary frame has a primary frame structure that includes a plurality of slots with one or more downlink slots, one or more uplink slots, and one or more switching slots;
performing downlink with the BS using a secondary frame on a second band of a secondary component carrier (SCC), wherein the second frame has a secondary frame structure that includes a plurality of slots having one or more downlink slots, one or more uplink slots, and one or more switching slots; and
sending a sounding reference signal (SRS) on the SCC,
wherein the primary frame and the secondary frame form a carrier aggregation (CA) frame structure where the SRS on the secondary frame of the SCC is aligned with a downlink slot on the primary frame of the PCC.