Low-overhead channel sounding in Wi-Fi7 based on partial band channel estimation
AssigneeCisco Technology, Inc.
InventorsMatthew Aaron Silverman, Ardalan Alizadeh, Khashayar Mirfakhraei, Gautam D. Bhanage
Life of this patent
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Abstract
Optimal determination of a Wireless Local Area Network (WLAN) sounding method and system may be provided. An Access Point (AP) selects a subchannel for the partial sounding. The AP then sounds the selected subchannel. A client station responds with Channel State Information (CSI). The AP can receive the CSI, from the client station, in response to the sounding. Based on the CSI from the selected subchannel, the AP extrapolates the CSI to determine predicted CSI for a wider bandwidth channel.
Claims18
A method comprising:
- selecting, by an Access Point (AP), a subchannel for a partial sounding based on a minimum bandwidth to conduct the partial sounding;
- sounding, by the AP, the selected subchannel;
- receiving, by the AP, a first Channel State Information (CSI) for a Station (STA) in response to the sounding;
- based on the first CSI from the selected subchannel, extrapolating, by the AP, the first CSI to determine predicted second CSI for a wider bandwidth channel;
- and
- determining the minimum bandwidth, wherein determining the minimum bandwidth comprises:
- sounding an entire bandwidth;
- receiving third CSI from the STA in response to the sounding of the entire bandwidth;
- extracting a tuple for a path from the third CSI;
- and
- based on the tuple, determining a time delay, wherein the minimum bandwidth is an inverse of the time delay.
A system comprising:
- a memory;
- and
- a processing unit coupled to the memory, wherein the processing unit is operative to:
- select a subchannel for a partial sounding based on a minimum bandwidth to conduct the partial sounding;
- sound the selected subchannel;
- receive a first Channel State Information (CSI) for a Station (STA) in response to the sounding;
- based on the first CSI from the selected subchannel, extrapolate the first CSI to determine predicted second CSI for a wider bandwidth channel;
- and
- determine the minimum bandwidth, wherein the processing unit being operative to determine the minimum bandwidth comprises the processing unit being operative to:
- sound an entire bandwidth;
- receive third CSI from the STA in response to the sounding of the entire bandwidth;
- extract a tuple for a path from the third CSI;
- and
- based on the tuple, determine a time delay, wherein the minimum bandwidth is an inverse of the time delay.
A non-transitory computer-readable medium that stores a set of instructions which when executed perform a method executed by the set of instructions comprising:
- selecting a subchannel for a partial sounding based on a minimum bandwidth to conduct the partial sounding;
- sounding the selected subchannel;
- receiving first Channel State Information (CSI) for a Station (STA) in response to the sounding;
- based on the first CSI from the selected subchannel, extrapolating the first CSI to determine predicted second CSI for a wider bandwidth channel;
- and
- determining the minimum bandwidth, wherein determining the minimum bandwidth comprises:
- sounding an entire bandwidth;
- receiving third CSI from the STA in response to the sounding of the entire bandwidth;
- extracting a tuple for a path from the third CSI;
- and
- based on the tuple, determining a time delay, wherein the minimum bandwidth is an inverse of the time delay.
Dependencies are inferred from the claim text.