Multiple-input multiple-output layer adaptation

Patent metadata

Field	Value
Publication number	US-2024088948-A1
Application number	US-202217931144-A
Country	US
Kind code	A1
Filing date	Sep 12, 2022
Priority date	Sep 12, 2022
Publication date	Mar 14, 2024
Grant date	—

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a maximum number of multiple-input multiple-output (MIMO) layers for a communication based at least in part on at least one of a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transition of a transmission reception point (TRP) associated with the network node to or from a dormancy state. The UE may perform the communication in accordance with the maximum number of MIMO layers. Numerous other aspects are described.

First claim

What is claimed is:

1 . An apparatus of a user equipment (UE) for wireless communication, comprising:
a memory; and one or more processors, coupled to the memory, configured to:
identify a maximum number of multiple-input multiple-output (MIMO) layers for a communication based at least in part on at least one of a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transition of a transmission reception point (TRP) associated with the network node to or from a dormancy state; and
perform the communication in accordance with the maximum number of MIMO layers.

2 . The apparatus of claim 1 , wherein the one or more processors are further configured to:
receive information indicating the number of CSI-RS ports, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

3 . The apparatus of claim 1 , wherein the one or more processors are further configured to:
receive information indicating the transition of the TRP to or from the dormancy state, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

4 . The apparatus of claim 1 , wherein the one or more processors, to identify the maximum number of MIMO layers, are configured to:
identify the maximum number of MIMO layers in accordance with a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

5 . The apparatus of claim 4 , wherein a first number of CSI-RS ports is mapped to a first number of MIMO layers and a second number of CSI-RS ports is mapped to a second number of MIMO layers, wherein the first number of MIMO layers is larger than the second number of MIMO layers and the first number of CSI-RS ports is larger than the second number of CSI-RS ports.

6 . The apparatus of claim 5 , wherein the maximum number of MIMO layers is the second number of MIMO layers and the number of CSI-RS ports associated with the network node is the second number of CSI-RS ports, wherein the one or more processors are configured to:
receive, from the network node, information indicating an active number of CSI-RS ports to the second number of CSI-RS ports, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

7 . The apparatus of claim 4 , wherein the one or more processors are further configured to:
receive configuration information indicating the mapping.

8 . The apparatus of claim 1 , wherein the one or more processors, to identify the maximum number of MIMO layers, are configured to:
identify the maximum number of MIMO layers as a sum of maximum numbers of MIMO layers of one or more non-dormant TRPs associated with the network node.

9 . The apparatus of claim 1 , wherein the network node is associated with two TRPs, wherein a TRP associated with the dormancy state is associated with a first maximum number of MIMO layers and a non-dormant TRP is associated with a second maximum number of MIMO layers, and wherein the maximum number of MIMO layers for the communication is the second maximum number of MIMO layers.

10 . The apparatus of claim 1 , wherein the one or more processors, to identify the maximum number of MIMO layers, are configured to:
identify the maximum number of MIMO layers by applying a scaling factor to a prior maximum number of MIMO layers based at least in part on the transition of the TRP associated with the network node to or from the dormancy state.

11 . The apparatus of claim 10 , wherein the one or more processors are further configured to:
receive an indication of the scaling factor.

12 . The apparatus of claim 1 , wherein the maximum number of MIMO layers is per bandwidth part, based at least in part on per-bandwidth-part configuration of maximum numbers of MIMO layers being configured.

13 . The apparatus of claim 1 , wherein the maximum number of MIMO layers is identified per cell, based at least in part on per-bandwidth-part configuration of maximum numbers of MIMO layers not being configured.

14 . The apparatus of claim 1 , wherein:
if per-bandwidth-part configuration of maximum numbers of MIMO layers is configured, the maximum number of MIMO layers is based at least in part on a configured maximum number of MIMO layers for a bandwidth part, and if per-bandwidth-part configuration of maximum numbers of MIMO layers is not configured, the maximum number of MIMO layers is based at least in part on a configured maximum number of MIMO layers for a cell.

15 . A network node for wireless communication, comprising:
a memory; and one or more processors, coupled to the memory, configured to:
transmit at least one of: information indicating a number of channel state information reference signal (CSI-RS) ports associated with the network node, or information indicating a transition of a transmission reception point (TRP) associated with the network node to or from a dormancy state; and
perform a communication in accordance with a maximum number of multiple-input multiple-output (MIMO) layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the dormancy state.

16 . The network node of claim 15 , wherein the maximum number of MIMO layers is based at least in part on a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

17 . The network node of claim 16 , wherein a first number of CSI-RS ports is mapped to a first number of MIMO layers and a second number of CSI-RS ports is mapped to a second number of MIMO layers, wherein the first number of MIMO layers is larger than the second number of MIMO layers and the first number of CSI-RS ports is larger than the second number of CSI-RS ports.

18 . The network node of claim 16 , wherein the one or more processors are further configured to:
transmit configuration information indicating the mapping.

19 . The network node of claim 15 , wherein the maximum number of MIMO layers is equal to a sum of maximum numbers of MIMO layers of one or more non-dormant TRPs associated with the network node.

20 . The network node of claim 19 , wherein the network node is associated with two TRPs, wherein a TRP associated with the dormancy state is associated with a first maximum number of MIMO layers and a non-dormant TRP is associated with a second maximum number of MIMO layers, and wherein the maximum number of MIMO layers for the communication is the second maximum number of MIMO layers.

21 . The network node of claim 15 , wherein the maximum number of MIMO layers is based at least in part on a scaling factor applied to a prior maximum number of MIMO layers based at least in part on the transition of the TRP associated with the network node to the dormancy state.

22 . The network node of claim 21 , wherein the one or more processors are further configured to:
transmit an indication of the scaling factor.

23 . The network node of claim 15 , wherein the maximum number of MIMO layers is identified per bandwidth part, based at least in part on per-bandwidth-part configuration of maximum numbers of MIMO layers being configured.

24 . The network node of claim 15 , wherein the maximum number of MIMO layers is per cell, based at least in part on per-bandwidth-part configuration of maximum numbers of MIMO layers being configured.

25 . The net

Assignees

• Qualcomm Inc

Inventors

• Abotabl Ahmed Attia
• Ly Hung Dinh
• Abdelghaffar Muhammad Sayed Khairy

Classifications

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04W88/08

  Access point devices · CPC title

• H04W92/02

  Inter-networking arrangements · CPC title

• H04L5/0098

  Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands · CPC title

• Y02D30/70

  in wireless communication networks · CPC title