US-12621031-B2 - Antenna switching for reference signals

US12621031B2US 12621031 B2US12621031 B2US 12621031B2US-12621031-B2

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured to indicate to a base station a distribution of transmit antennas and receive antennas across a set of antenna panels, and the base station may configure resource sets for reference signal transmissions from the antenna panels based on the indicated distribution. In a first example, the UE may be configured to indicate a respective number of transmit antennas and receive antennas at each antenna panel. In a second example, the UE may be configured to indicate a sum of transmit antennas and a sum of receive antennas across all antenna panels, along with information on how the transmit antennas and receive antennas are distributed. Based on the indication, the base station may configure resource sets for reference signal transmission on sets of ports in resources of the resource sets.

Inventors

Mostafa Khoshnevisan
Aleksandar Damnjanovic
Xiaoxia Zhang
Tao Luo
Fang Yuan
Jing Sun
Yitao Chen
Juan Montojo
Rajat Prakash

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260505
Application Date: 20240702

Claims (20)

1 . A network entity, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to: receive, from a user equipment (UE), an indication of a distribution of transmit antennas and receive antennas over a plurality of antenna panels associated with the UE; transmit, to the UE, a configuration for a plurality of resource sets, the configuration comprising a mapping of a set of ports associated with the plurality of antenna panels to the plurality of resource sets; and receive a set of reference signals over the plurality of resource sets based at least in part on transmitting the configuration and the distribution of the transmit antennas and the receive antennas over the plurality of antenna panels associated with the UE.
2 . The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: determine respective quantities of transmit antennas and receive antennas at each antenna panel of the plurality of antenna panels based at least in part on receiving the indication.
3 . The network entity of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: receive, in the indication, a vector corresponding to the plurality of antenna panels, wherein the vector comprises a set of elements, each element corresponding to respective quantities of transmit antennas and receive antennas at a respective antenna panel of the plurality of antenna panels.
4 . The network entity of claim 2 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: determine one or more respective resource sets for each antenna panel of the plurality of antenna panels based at least in part on determining the respective quantities, wherein the configuration is based at least in part on determining the one or more respective resource sets.
5 . The network entity of claim 4 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: determine respective power control parameters and respective spatial relation parameters corresponding to each antenna panel of the plurality of antenna panels, wherein the configuration transmitted to the UE comprises the respective power control parameters and the respective spatial relation parameters, and wherein the set of reference signals are received over the plurality of resource sets based at least in part on the respective power control parameters and the respective spatial relation parameters.
6 . The network entity of claim 4 , wherein, to receive the set of reference signals over the plurality of resource sets, the one or more processors are individually or collectively operable to execute the code to cause the network entity to: receive respective reference signals over the one or more respective resource sets based at least in part on transmitting the configuration to the UE.
7 . The network entity of claim 4 , wherein each resource of the one or more respective resource sets for an antenna panel corresponds to a respective quantity of transmit antennas and receive antennas at the antenna panel.
8 . The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: determine respective sums of the transmit antennas and the receive antennas over the plurality of antenna panels based at least in part on receiving the indication.
9 . The network entity of claim 8 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: determine respective sets of power control parameters and respective sets of spatial relation parameters corresponding to each resource of the plurality of resource sets, wherein the configuration is based at least in part on determining the respective sets of power control parameters and respective sets of spatial relation parameters, and wherein the set of reference signals are received over the plurality of resource sets based at least in part on the respective sets of power control parameters and the respective sets of spatial relation parameters.
10 . The network entity of claim 8 , wherein, to receive the set of reference signals over the plurality of resource sets, the one or more processors are individually or collectively operable to execute the code to cause the network entity to: receive respective reference signals over each resource of the plurality of resource sets based at least in part on determining the respective sums of the transmit antennas and the receive antennas.
11 . The network entity of claim 8 , wherein the mapping of the set of ports to the plurality of resource sets is based at least in part on determining the respective sums.
12 . The network entity of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the network entity to: determine channel state information for one or more downlink transmissions to the UE based at least in part on receiving the set of reference signals; and transmit the one or more downlink transmissions based at least in part on determining the channel state information.
13 . The network entity of claim 1 , wherein the set of reference signals comprise a set of sounding reference signals.
14 . A method for wireless communications at a network entity, comprising: receiving, from a user equipment (UE), an indication of a distribution of transmit antennas and receive antennas over a plurality of antenna panels associated with the UE; transmitting, to the UE, a configuration for a plurality of resource sets, the configuration comprising a mapping of a set of ports associated with the plurality of antenna panels to the plurality of resource sets; and receiving a set of reference signals over the plurality of resource sets based at least in part on transmitting the configuration and the distribution of the transmit antennas and the receive antennas over the plurality of antenna panels associated with the UE.
15 . The method of claim 14 , further comprising: determining respective quantities of transmit antennas and receive antennas at each antenna panel of the plurality of antenna panels based at least in part on receiving the indication.
16 . The method of claim 15 , further comprising: receiving, in the indication, a vector corresponding to the plurality of antenna panels, wherein the vector comprises a set of elements, each element corresponding to respective quantities of transmit antennas and receive antennas at a respective antenna panel of the plurality of antenna panels.
17 . The method of claim 15 , further comprising: determining one or more respective resource sets for each antenna panel of the plurality of antenna panels based at least in part on determining the respective quantities, wherein the configuration is based at least in part on determining the one or more respective resource sets.
18 . The method of claim 17 , further comprising: determining respective power control parameters and respective spatial relation parameters corresponding to each antenna panel of the plurality of antenna panels, wherein the configuration transmitted to the UE comprises the respective power control parameters and the respective spatial relation parameters, and wherein the set of reference signals are received over the plurality of resource sets based at least in part on the respective power control parameters and the respective spatial relation parameters.
19 . The method of claim 17 , wherein receiving the set of reference signals over the plurality of resource sets comprises: receiving respective reference signals over the one or more respective resource sets based at least in part on transmitting the configuration to the UE.
20 . The method of claim 17 , wherein each resource of the one or more respective resource sets for an antenna panel corresponds to a respective quantity of transmit antennas and receive antennas at the antenna panel.

Description

CROSS REFERENCE The present Application is a continuation of U.S. patent application Ser. No. 18/002,250 by KHOSHNEVISAN et al., entitled “ANTENNA SWITCHING FOR REFERENCE SIGNALS,” filed Dec. 16, 2022, which is a 371 national phase filing of International Patent Application No. PCT/CN2020/110461 by KHOSHNEVISAN et al. entitled “ANTENNA SWITCHING FOR REFERENCE SIGNALS,” filed Aug. 21, 2020, each of which is assigned to the assignee hereof, and each of which is expressly incorporated by reference in its entirety herein. FIELD OF TECHNOLOGY The following relates to wireless communications, including antenna switching for reference signals. BACKGROUND Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). Some wireless communications systems may support communication between base stations and UEs with various capabilities. As demand for UE efficiency increases, however, some wireless communications system may fail to efficiently manage network access for UEs with differing capabilities. SUMMARY The described techniques relate to improved methods, systems, devices, and apparatuses that support antenna switching for reference signals. Generally, the described techniques provide for enabling a user equipment (UE) to indicate to a base station a distribution of transmit antennas and receive antennas across a set of antenna panels, where the base station may configure resource sets for reference signal transmissions (e.g., sounding reference signal (SRS) transmissions) from the antenna panels based on the indicated distribution. In a first example, the UE may be configured to indicate a respective number of transmit antennas and receive antennas at each antenna panel, for example as a vector with an element for each antenna panel. In a second example, the UE may be configured to indicate a total number of transmit antennas and receive antennas across all antenna panels, along with information on how the transmit antennas and receive antennas are distributed. Based on the indication, the base station may configure resource sets (e.g., SRS resource sets) for reference signal transmission on a set of ports associated with the antenna panels, which may enable the base station to configure sounding for each antenna panel to determine channel state information (CSI) for downlink transmissions to the UE. A method of wireless communications at a UE is described. The method may include transmitting, to a base station, an indication of a distribution of transmit antennas and receive antennas over a set of antenna panels associated with the UE, receiving a configuration for a set of resource sets, the configuration mapping a set of ports associated with the set of antenna panels to the set of resource sets, and transmitting, using the set of antenna panels, a set of reference signals over the set of resource sets based on the configuration and the distribution of the transmit antennas and the receive antennas over the set of antenna panels. An apparatus for wireless communications at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a base station, an indication of a distribution of transmit antennas and receive antennas over a set of antenna panels associated with the UE, receive a configuration for a set of resource sets, the configuration mapping a set of ports associated with the set of antenna panels to the set of resource sets, and transmit, using the set of antenna panels, a set of reference signals over the set of resource sets based on the configuration and the distribution of the transmit antennas and the receive antennas over the set of antenna panels. Another apparatus for wireless communications at a UE is described. The apparatus may include means for transmitti