Techniques for dynamic pre-equalization switching

Patent metadata

Field	Value
Publication number	US-12470442-B2
Application number	US-202318320017-A
Country	US
Kind code	B2
Filing date	May 18, 2023
Priority date	May 18, 2023
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

Methods, systems, and devices for wireless communications are described. In some examples, the first wireless device may transmit, to a second wireless device, a control message indicating a set of pre-equalization transmission schemes supported by the first wireless device for receipt of messaging pre-equalized by the second wireless device. The first wireless device may transmit a measurement report that indicates a measurement of a wireless channel between the first wireless device and the second wireless device, where the measurement may be a signal-to-interference and noise (SINR) measurement. The first wireless device may receive a control signal indicative of a first pre-equalization transmission scheme to be used by the second wireless device for pre-equalization based at least in part on the set of pre-equalization transmission schemes and the measurement. The first wireless device may receive, via the wireless channel, a downlink message pre-equalized in accordance with the first pre-equalization transmission scheme.

First claim

What is claimed is:

1 . An apparatus for wireless communications at a first wireless device, comprising:
one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
transmit a control message indicating a set of pre-equalization transmission schemes supported by the first wireless device for receipt of messaging pre-equalized by a second wireless device for transmission to the first wireless device;
transmit a measurement report indicating a measurement of a wireless channel between the first wireless device and the second wireless device;
receive a control signal indicative of a first pre-equalization transmission scheme to be used by the second wireless device for pre-equalization based at least in part on the set of pre-equalization transmission schemes and the measurement; and
receive, via the wireless channel, one or more downlink messages pre-equalized in accordance with the first pre-equalization transmission scheme.

2 . The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive, as part of the control signal, an indication of a first waveform of the one or more downlink messages, wherein the control signal indicates the first pre-equalization transmission scheme based at least in part on the first waveform of the one or more downlink messages.

3 . The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
transmit, as part of the measurement report, an indication of a channel characteristic of the wireless channel between the first wireless device and the second wireless device, wherein the control signal indicates the first pre-equalization transmission scheme based at least in part on the channel characteristic.

4 . The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive a second control signal indicating that pre-equalization for one or more second downlink messages is disabled based at least in part on at least one of a latency associated with channel measurement reporting satisfying a latency threshold or a quantity of unsuccessful transmissions between the first wireless device and the second wireless device satisfying a quantity threshold.

5 . The apparatus of claim 4 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive, using channel equalization, the one or more second downlink messages based at least in part on the second control signal.

6 . The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive, as part of the control signal, an indication of a power scaling parameter associated with the first pre-equalization transmission scheme, wherein the instructions are executable by the one or more processors to cause the apparatus to receive the one or more downlink messages in accordance with the power scaling parameter.

7 . The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive, as part of the control signal, an indication of one or more parameters associated with the first pre-equalization transmission scheme, wherein the instructions are executable by the one or more processors to cause the apparatus to receive the one or more downlink messages based at least in part on the one or more parameters.

8 . The apparatus of claim 1 , wherein:
the control signal indicates the first pre-equalization transmission scheme based at least in part on the measurement satisfying a measurement threshold, and the measurement threshold is based at least in part on one of a channel characteristic of the wireless channel between the first wireless device and the second wireless device, or a waveform of the one or more downlink messages, or both.

9 . The apparatus of claim 1 , wherein the first pre-equalization transmission scheme comprises at least one of a transmission zero-forcing pre-equalization transmission scheme, a transmission minimum mean squared error pre-equalization transmission scheme, a Tomlinson-Harashima zero-forcing pre-equalization transmission scheme, or a Tomlinson-Harashima minimum mean squared error pre-equalization transmission scheme.

10 . An apparatus for wireless communications at a second wireless device, comprising:
one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
receive a control message indicating a set of pre-equalization transmission schemes supported by a first wireless device for receipt of messaging pre-equalized by the second wireless device for transmission to the first wireless device;
receive a measurement report indicating a measurement of a wireless channel between the first wireless device and the second wireless device;
transmit a control signal indicative of a first pre-equalization transmission scheme to be used by the second wireless device for pre-equalization based at least in part on the set of pre-equalization transmission schemes and the measurement; and
transmit, via the wireless channel, one or more downlink messages pre-equalized in accordance with the first pre-equalization transmission scheme.

11 . The apparatus of claim 10 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
transmit, as part of the control signal, an indication of a first waveform of the one or more downlink messages, wherein the control signal indicates the first pre-equalization transmission scheme based at least in part on the first waveform of the one or more downlink messages.

12 . The apparatus of claim 10 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive, as part of the measurement report, an indication of a channel characteristic of the wireless channel between the first wireless device and the second wireless device, wherein the control signal indicates the first pre-equalization transmission scheme based at least in part on the channel characteristic.

13 . The apparatus of claim 10 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
transmit a second control signal indicating that pre-equalization for one or more second downlink messages is disabled based at least in part on at least one of a latency associated with channel measurement reporting satisfying a latency threshold or a quantity of unsuccessful transmissions between the first wireless device and the second wireless device satisfying a quantity threshold.

14 . The apparatus of claim 13 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
refrain from pre-equalizing the one or more second downlink messages based at least in part on the second control signal.

15 . The apparatus of claim 10 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
transmit, as part of the control signal, an indication of a power scaling parameter associated with the first pre-equalization transmission scheme, wherein the instruction

Assignees

• Qualcomm Inc

Inventors

• Barak Tom
• Touboul Assaf
• Levitsky Michael
• Paz Daniel
• Sverdlov Alexander

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04B17/336

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title

• H04L25/0224

  using sounding signals · CPC title

• H04L25/03891 Primary

  Spatial equalizers (MIMO diversity systems H04B7/0413) · CPC title

• H04L25/03343 Primary

  Arrangements at the transmitter end · CPC title