Multi-link operations-based WiFi sensing and ranging

Patent metadata

Field	Value
Publication number	US-12506525-B2
Application number	US-202218063576-A
Country	US
Kind code	B2
Filing date	Dec 8, 2022
Priority date	Jul 8, 2022
Publication date	Dec 23, 2025
Grant date	Dec 23, 2025

Abstract

Techniques for enhanced wireless sensing or ranging are provided. First and second channel state information (CSI) data, for a first and second link of a plurality of links in a multi-link operation (MLO) system, is collected. A set of channel parameters is estimated, based on the second CSI data, using a channel propagation model. First predicted CSI data for the first link is generated based on the estimated set of channel parameters. The first CSI data is calibrated based on the first predicted CSI data, comprising determining at least one of an amplitude difference or a phase difference between the first CSI data and the first predicted CSI data. Aggregated CSI data is generated based on the calibrated first CSI data and the second CSI data, and at least one of wireless sensing or wireless ranging is performed based on the aggregated CSI data.

First claim

We claim:

1 . A method, comprising:
collecting first channel state information (CSI) data for a first link of a plurality of links in a multi-link operation (MLO) system; collecting second CSI data for a second link of the plurality of links; estimating a set of channel parameters for the second link, based on the second CSI data, using a channel propagation model; generating first predicted CSI data for the first link, based on the estimated set of channel parameters for the second link, using the channel propagation model; calibrating the first CSI data based on the first predicted CSI data, comprising determining at least one of (i) an amplitude difference or (ii) a phase difference between the first CSI data and the first predicted CSI data; generating aggregated CSI data based on the calibrated first CSI data and the second CSI data; and performing at least one of (i) wireless sensing or (ii) wireless ranging based on the aggregated CSI data.

2 . The method of claim 1 , further comprising:
collecting third CSI data for the first link; and calibrating the third CSI data based on at least one of (i) the amplitude difference or (ii) the phase difference between the first CSI data and the first predicted CSI data.

3 . The method of claim 1 , further comprising:
estimating a second set of channel parameters, based on the first CSI data, using the channel propagation model; generating second predicted CSI data for the second link based on the estimated second set of channel parameters; calibrating the second CSI data based on the second predicted CSI data; and generating the aggregated CSI data based further on the calibrated second CSI data.

4 . The method of claim 3 , further comprising:
comparing at least one (i) an amplitude difference or (ii) a phase difference between the first CSI data and the first predicted CSI data and at least one of (i) an amplitude difference or (ii) a phase difference between the second CSI data and the second predicted CSI data; and determining whether to perform one or more recalibration operations based on the comparison.

5 . The method of claim 4 , wherein performing the one or more recalibration operations comprises estimating a third set of channel parameters using the channel propagation model.

6 . The method of claim 1 , further comprising determining both the amplitude difference and the phase difference between the first CSI data and the first predicted CSI data.

7 . The method of claim 1 , wherein generating the aggregated CSI data comprises:
upsampling the first CSI data and the calibrated second CSI data; and generating a set of power delay profiles by applying an inverse fast Fourier transform (IFFT) operation to the upsampled first CSI data and the upsampled second CSI data.

8 . The method of claim 7 , wherein generating the aggregated CSI data further comprises summing the set of power delay profiles.

9 . The method of claim 7 , wherein upsampling the first CSI data and the calibrated second CSI data comprises:
determining a first number of subcarriers reflected in the first CSI data; determining a second number of subcarriers reflected in the calibrated second CSI data; determining a shared multiple of the first and second number; and upsampling the first CSI data and the calibrated second CSI data to the shared multiple, comprising inserting one or more defined values between subcarriers.

10 . A non-transitory computer-readable medium containing computer program code that, when executed by operation of one or more computer processors, performs an operation comprising:
collecting first channel state information (CSI) data for a first link of a plurality of links in a multi-link operation (MLO) system; collecting second CSI data for a second link of the plurality of links; estimating a set of channel parameters for the second link, based on the second CSI data, using a channel propagation model; generating first predicted CSI data for the first link, based on the estimated set of channel parameters for the second link, using the channel propagation model; calibrating the first CSI data based on the first predicted CSI data, comprising determining at least one of (i) an amplitude difference or (ii) a phase difference between the first CSI data and the first predicted CSI data; generating aggregated CSI data based on the calibrated first CSI data and the second CSI data; and performing at least one of (i) wireless sensing or (ii) wireless ranging based on the aggregated CSI data.

11 . The non-transitory computer-readable medium of claim 10 , the operation further comprising:
collecting third CSI data for the first link; and calibrating the third CSI data based on at least one of (i) the amplitude difference or (ii) the phase difference between the first CSI data and the first predicted CSI data.

12 . The non-transitory computer-readable medium of claim 10 , the operation further comprising:
estimating a second set of channel parameters, based on the first CSI data, using the channel propagation model; generating second predicted CSI data for the second link based on the estimated second set of channel parameters; calibrating the second CSI data based on the second predicted CSI data; and generating the aggregated CSI data based further on the calibrated second CSI data.

13 . The non-transitory computer-readable medium of claim 12 , the operation further comprising:
comparing at least one (i) an amplitude difference or (ii) a phase difference between the first CSI data and the first predicted CSI data and at least one of (i) an amplitude difference or (ii) a phase difference between the second CSI data and the second predicted CSI data; and determining whether to perform one or more recalibration operations based on the comparison.

14 . The non-transitory computer-readable medium of claim 10 , wherein generating the aggregated CSI data comprises:
upsampling the first CSI data and the calibrated second CSI data; and generating a set of power delay profiles by applying an inverse fast Fourier transform (IFFT) operation to the upsampled first CSI data and the upsampled second CSI data.

15 . The non-transitory computer-readable medium of claim 14 , wherein upsampling the first CSI data and the calibrated second CSI data comprises:
determining a first number of subcarriers reflected in the first CSI data; determining a second number of subcarriers reflected in the calibrated second CSI data; determining a shared multiple of the first and second number; and upsampling the first CSI data and the calibrated second CSI data to the shared multiple, comprising inserting one or more defined values between subcarriers.

16 . A system, comprising:
one or more computer processors; and a memory containing a program which when executed by the one or more computer processors performs an operation, the operation comprising:
collecting first channel state information (CSI) data for a first link of a plurality of links in a multi-link operation (MLO) system;
collecting second CSI data for a second link of the plurality of links;
estimating a set of channel parameters for the second link, based on the second CSI data, using a channel propagation model;
generating first predicted CSI data for the first link, based on the estimated set of channel parameters for the second link, using the channel propagation model;
calibrating the first CSI data based on the first predicted CSI data, comprising determining at least one of (i) an amplitude difference or (ii) a phase differen

Assignees

• Cisco Tech Inc

Inventors

• Alizadeh Ardalan
• Amini Peiman
• Silverman Matthew A
• Pierrugues Laurent A

Classifications

• H04B7/066

  Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM] · CPC title

• H04B7/0626 Primary

  Channel coefficients, e.g. channel state information [CSI] · CPC title