US 11,994,814 B2
Channel state information measurements for license assisted access
Mattias Frenne, Uppsala (SE); Jung-Fu Cheng, Fremont, CA (US); Sorour Falahati, Stockholm (SE); Havish Koorapaty, Saratoga, CA (US); and Daniel Larsson, Lund (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed by TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed on Feb. 7, 2023, as Appl. No. 18/106,487.
Application 18/106,487 is a continuation of application No. 16/773,745, filed on Apr. 14, 2020, granted, now 11,573,504.
Application 16/773,745 is a continuation of application No. 16/113,905, filed on Aug. 27, 2018, granted, now 10,627,737, issued on Apr. 21, 2020.
Application 16/113,905 is a continuation of application No. 14/737,957, filed on Jun. 12, 2015, granted, now 10,063,304, issued on Aug. 28, 2018.
Claims priority of provisional application 62/012,616, filed on Jun. 16, 2014.
Prior Publication US 2023/0314983 A1, Oct. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 16/14 (2009.01); G03G 15/08 (2006.01); G03G 21/18 (2006.01); H04B 7/06 (2006.01); H04L 5/00 (2006.01); H04L 27/00 (2006.01); G03G 15/09 (2006.01); G03G 21/16 (2006.01); H04W 76/15 (2018.01)
CPC G03G 15/0812 (2013.01) [G03G 15/0806 (2013.01); G03G 15/0865 (2013.01); G03G 21/1814 (2013.01); H04B 7/0626 (2013.01); H04L 5/001 (2013.01); H04L 5/005 (2013.01); H04L 27/0006 (2013.01); H04W 16/14 (2013.01); G03G 15/0921 (2013.01); G03G 15/0935 (2013.01); G03G 21/1676 (2013.01); G03G 2215/0855 (2013.01); G03G 2215/0872 (2013.01); G03G 2221/1654 (2013.01); H04W 76/15 (2018.02)] 20 Claims
OG exemplary drawing
 
1. A wireless device enabled to operate in a cellular communications network, the wireless device comprising:
a transceiver;
at least one processor; and
memory containing instructions executable by the at least one processor whereby the wireless device operates to:
determine whether a Channel State Information Reference Symbol (CSI-RS) transmission from a License Assisted Secondary Cell (LA SCell) of the wireless device is present in a subframe, the LA SCell being in an unlicensed frequency band;
perform a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe; and
refrain from performing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in the subframe,
wherein determining whether a CSI-RS transmission from the LA SCell is present in the subframe comprises one of:
determining whether the wireless device has received an indication of the CSI-RS transmission for the cell for a subframe, wherein the indication is received in a downlink control information (DCI);
determining whether the wireless device has received an indication that the subframe is a downlink subframe, wherein the indication is received in a downlink control information (DCI) and wherein if the subframe is a downlink subframe the CSI-RS transmission is present and if the subframe is not a downlink subframe the CSI-RS transmission is not present;
determining whether the wireless device has received a downlink scheduling assignment for the cell for the subframe, wherein determining that a downlink scheduling assignment has been received for the cell for the subframe indicates that a CSI-RS transmission is present in the subframe and determining that a downlink scheduling assignment has not been received for the cell for the subframe indicates that a CSI-RS transmission is not present in the subframe; and
determining whether the subframe is contains a discovery signal for the cell, wherein determining that the subframe contains a discovery signal for the cell indicates that a CSI-RS transmission is present in the subframe and determining that the subframe does not contains a discovery signal for the cell indicates that a CSI-RS transmission is not present in the subframe.