	US 12,088,535 B2
	Methods, base station and wireless device for supporting radio communication
Jung-Fu Cheng, Fremont, CA (US); Sorour Falahati, Stockholm (SE); Rui Fan, Beijing (CN); Havish Koorapaty, Saratoga, CA (US); Daniel Larsson, Stockholm (SE); Stefan Parkvall, Bromma (SE); and Xinghua Song, Beijing (CN)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 15/125,757
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Mar. 17, 2015, PCT No. PCT/SE2015/050311 § 371(c)(1), (2) Date Sep. 13, 2016, PCT Pub. No. WO2015/142271, PCT Pub. Date Sep. 24, 2015.
Claims priority of provisional application 61/955,244, filed on Mar. 19, 2014.
Prior Publication US 2017/0005775 A1, Jan. 5, 2017
Int. Cl. H04L 5/00 (2006.01); H04L 1/1812 (2023.01); H04L 5/14 (2006.01); H04L 27/26 (2006.01); H04W 16/32 (2009.01); H04W 40/00 (2009.01); H04W 72/23 (2023.01)

CPC H04L 5/0098 (2013.01) [H04L 1/1812 (2013.01); H04L 5/14 (2013.01); H04W 16/32 (2013.01); H04W 40/005 (2013.01); H04W 72/23 (2023.01); H04L 27/2601 (2013.01)]

36 Claims

1. A method performed by a base station of a wireless network, for supporting radio communication between wireless devices and the base station, wherein the base station employs carrier aggregation with multiple carriers serving a primary cell (PCell) and at least one secondary cell (SCell), wherein the base station serves the PCell on licensed frequency spectrum and serves the at least one SCell on unlicensed frequency spectrum, the method comprising:

applying a Listen-Before-Talk (LBT) mechanism to detect whether the unlicensed frequency spectrum of the at least one SCell is idle and available for radio communication;

if the LBT mechanism indicates that the unlicensed frequency spectrum is idle:

determining to transmit downlink signals on a carrier serving the at least one SCell; and

signaling an SCell status, to the wireless devices, comprising an activity value indicating a time duration during which the at least one SCell will be in an active state.