US 12,010,616 B2
Controlling MIMO layers for UE power saving
Yuchul Kim, Santa Clara, CA (US); Haitong Sun, Irvine, CA (US); Wei Zeng, San Diego, CA (US); and Dawei Zhang, Saratoga, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 9, 2019, as Appl. No. 16/564,018.
Claims priority of provisional application 62/736,336, filed on Sep. 25, 2018.
Prior Publication US 2020/0100178 A1, Mar. 26, 2020
Int. Cl. H04W 52/02 (2009.01); H04B 7/0456 (2017.01); H04W 72/23 (2023.01); H04W 76/10 (2018.01); H04W 76/28 (2018.01); H04W 72/044 (2023.01)
CPC H04W 52/0212 (2013.01) [H04B 7/046 (2013.01); H04W 52/0203 (2013.01); H04W 72/23 (2023.01); H04W 76/10 (2018.02); H04W 76/28 (2018.02); H04W 72/0466 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
at a base station:
establishing a wireless communication link with a user equipment device (UE);
receiving, from the UE, a preference for a maximum number of multiple-input multiple-output (MIMO) layers for power savings at the UE;
configuring a first Bandwidth Part (BWP), wherein a configuration of the first BWP includes a first maximum number of MIMO layers specific to the first BWP;
configuring a second BWP, wherein a configuration of the second BWP includes a second maximum number of MIMO layers specific to the second BWP, wherein the second maximum number of MIMO layers is less than the first maximum number of MIMO layers;
transmitting, to the UE, data using the first BWP and using a first number of MIMO layers less than or equal to the first maximum number of MIMO layers;
transmitting, to the UE, an indication to switch to the second BWP configured with the second maximum number of MIMO layers to enable the power savings at the UE;
transmitting, to the UE, downlink control information, wherein the downlink control information indicates an actual number of MIMO layers less than or equal to the second maximum number of MIMO layers; and
transmitting data to the UE using the actual number of MIMO layers.