US 11,889,317 B2
Apparatus and method for reception and transmission of control channels
Ravikiran Nory, Buffalo Grove, IL (US); Vijay Nangia, Woodridge, IL (US); Murali Narasimha, Vernon Hills, IL (US); and Ajit Nimbalker, Buffalo Grove, IL (US)
Assigned to Motorola Mobility LLC, Chicago, IL (US)
Filed by Motorola Mobility LLC, Chicago, IL (US)
Filed on Aug. 24, 2021, as Appl. No. 17/409,802.
Application 17/409,802 is a division of application No. 16/836,542, filed on Mar. 31, 2020, granted, now 11,503,637.
Application 16/836,542 is a continuation of application No. 16/011,393, filed on Jun. 18, 2018, granted, now 10,608,795, issued on Mar. 31, 2020.
Application 16/011,393 is a continuation of application No. 14/733,980, filed on Jun. 9, 2015, granted, now 10,009,153, issued on Jun. 26, 2018.
Claims priority of provisional application 62/110,404, filed on Jan. 30, 2015.
Prior Publication US 2021/0385032 A1, Dec. 9, 2021
Int. Cl. H04W 16/14 (2009.01); H04W 72/0446 (2023.01); H04W 72/23 (2023.01); H04L 5/00 (2006.01); H04W 74/08 (2009.01); H04W 72/0453 (2023.01); H04L 27/26 (2006.01); H04L 5/14 (2006.01)
CPC H04W 16/14 (2013.01) [H04L 5/001 (2013.01); H04L 5/0094 (2013.01); H04W 72/0446 (2013.01); H04W 72/0453 (2013.01); H04W 72/23 (2023.01); H04W 74/0808 (2013.01); H04L 5/008 (2013.01); H04L 5/0051 (2013.01); H04L 5/0053 (2013.01); H04L 5/1469 (2013.01); H04L 27/2602 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for a base station to make a transmission between the base station and a user equipment (UE) on an unlicensed carrier frequency, the method comprising:
operating, by the base station, a first serving cell on a licensed carrier frequency and a second serving cell on an unlicensed carrier frequency;
performing, by the base station, a listen before talk (LBT) on the unlicensed carrier frequency for a first time duration;
determining, by the base station, that the unlicensed carrier frequency is free;
transmitting, by the base station, an activation command on the first serving cell for receipt by the UE, the activation command being configured to activate the UE to receive transmissions from the base station on the second serving cell; and
transmitting, by the base station, after determining that the unlicensed carrier frequency is free, a reserve transmission on the unlicensed carrier frequency at least until the base station begins transmission of the activation command on the first serving cell.