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US 12,010,616 B2Granted
Controlling MIMO layers for UE power saving
AssigneeApple Inc.
InventorsYuchul Kim, Haitong Sun, Wei Zeng, Dawei Zhang
Life of this patent
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Abstract
This disclosure relates to techniques for dynamically adjusting a number of active receiver chains of a wireless device. Based on communication parameters exchanged with a base station, a device may determine a maximum number of receiver chains needed for data reception during one or more time periods. Such dynamic adjustment may enable power savings.
Claims20
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.
7 more elements
An apparatus, comprising:
- a processor configured to cause a user equipment device (UE) to:
- establish communication with a base station;
- transmit, to the base station, a preference for a maximum number of multiple-input multiple-output (MIMO) layers for power savings at the UE;
- receive, from the base station, a first communication parameter;
- determine a maximum number of MIMO layers for a first bandwidth part, BWP, based on the first communication parameter;
- receive, from the base station, a second communication parameter;
- determine a second maximum number of MIMO layers for a second BWP based on the second communication parameter;
- receive, from the base station, an indication to switch to the second BWP configured with the second maximum number of MIMO layers, wherein the switch to the second BWP configured with the second maximum number of MIMO layers enables the power savings at the UE;
- receive, from the base station, downlink control information (DCI) indicating an actual number of MIMO layers equal to or less than the second maximum number of MIMO layers;
- and
- receive, from the base station, downlink data using the actual number of MIMO layers.
8 more elements
A user equipment device (UE), comprising:
- a radio;
- and
- a processor operably connected to the radio and configured to cause the UE to:
- establish communication with a base station;
- transmit, to the base station, a preference for a maximum number of multiple-input multiple-output (MIMO) layers for power savings at the UE;
- receive, from the base station, a first communication parameter;
- determine a maximum number of MIMO layers for a first bandwidth part, BWP, based on the first communication parameter;
- receive, from the base station, a second communication parameter;
- determine a second maximum number of MIMO layers for a second BWP based on the second communication parameter;
- receive, from the base station, an indication to switch to the second BWP configured with the second maximum number of MIMO layers, wherein the switch to the second BWP configured with the second maximum number of MIMO layers enables the power savings at the UE;
- receive, from the base station, downlink control information (DCI) indicating an actual number of MIMO layers equal to or less than the second maximum number of MIMO layers;
- and
- receive, from the base station, downlink data using the actual number of MIMO layers.
10 more elements
Dependencies are inferred from the claim text.