Method based on channel state information feedback, device, and medium

Abstract

To provide a method based on channel state information (CSI), a device, and a medium.SOLUTION: In an exemplary method, a sensing response device obtains CSI data based on channel estimation and generates power delay profile (PDP) data based on the CSI data. Then, the sensing response device feeds back a part of the PDP data in the generated PDP data. Therefore, feedback overheads are reduced. In addition, sensing performance is ensured to some extent.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present disclosure relates to the field of wireless local area networks, and more particularly to a method, apparatus, and medium for performing feedback based on channel state information (CSI). [Background technology]

[0002] In Wireless Local Area Network Sensing (WLAN Sensing) use cases, targets within an area of ​​interest are sensed using WLAN signals. Unlike 802.11az, the sensed targets in WLAN sensing do not need to carry any devices. WLAN sensing-related technologies can be widely applied to intrusion detection, motion recognition, breathing / heartbeat detection, and other scenarios. WLAN sensing is implemented in a manner in which sensing is performed based on Channel State Information (CSI). CSI reflects the channel conditions between a transmitting device and a receiving device and contains rich detailed information. Therefore, targets of interest within the environment can be sensed through CSI analysis. However, conventional CSI feedback methods cannot effectively support WLAN sensing. Summary of the Invention

[0003] This disclosure provides a solution for performing feedback based on channel state information (CSI).

[0004] According to a first aspect of the present disclosure, there is provided a communication method, in which a sensing-response device acquires CSI data based on channel estimation, generates power delay profile (PDP) data based on the CSI data, and then feeds back a portion of the PDP data within the generated PDP data.

[0005] In some implementations, the sensing response device receives an indication for PDP data feedback from the sensing initiation device before CSI data is obtained based on the channel estimation.

[0006] In some implementations, the sensing response device generates PDP data based on the CSI data in response to receiving an indication for PDP data feedback.

[0007] In some implementations, the sensing response device receives an indication of the PDP data feedback from the sensing initiation device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating the PDP data feedback.

[0008] In some implementations, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed.

[0009] In some implementations, a trigger type field included in a common information field in the trigger frame indicates that PDP data feedback is to be performed.

[0010] In some implementations, a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0011] In some implementations, an Association Identifier (AID) field included in a dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0012] In some implementations, the PDP frame includes a multiple-input multiple-output MIMO control field that includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0013] In some implementations, the sensing response device selects a portion of the PDP data to be fed back from the generated PDP data based on an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0014] In some implementations, the sensing response device utilizes a PDP report frame to feed back a portion of the PDP data within the generated PDP data.

[0015] In some implementations, the sensing response device feeds back a portion of the PDP data based on the propagation distance of the sensing signal.

[0016] In some implementations, the sensing response device receives an indication from the sensing initiation device about a distance of interest of the sensing signal, and the sensing response device feeds back a portion of the PDP data based on the distance of interest.

[0017] In some implementations, the sensing response device receives an indication of the offset from the sensing initiation device and feeds back a portion of the PDP data based on the distance and offset of interest.

[0018] In some implementations, the sensing response device receives at least one of an indication of a distance or an indication of an offset of interest from the sensing initiation device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating PDP data feedback.

[0019] In some implementations, a trigger dependent information field included in a common information field in a trigger frame indicates at least one of a distance or an offset of interest.

[0020] In some implementations, the sensing-response device feeds back a portion of the PDP data in the generated PDP data to the sensing-initiating device.

[0021] According to a second aspect of the present disclosure, there is provided a communication method, in which a sensing response device receives an indication for PDP data feedback from a sensing initiation device, and based on the indication, the sensing response device feeds back a portion of PDP data within the PDP data generated based on CSI data.

[0022] In some implementations, the sensing-response device feeds back a portion of the PDP data in the generated PDP data to the sensing-initiating device.

[0023] In some implementations, the sensing response device obtains CSI data based on the channel estimation and generates PDP data based on the CSI data.

[0024] In some implementations, the sensing response device receives an indication of the PDP data feedback from the sensing initiation device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating PDP data feedback.

[0025] In some implementations, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed.

[0026] In some implementations, a trigger type field included in a common information field in the trigger frame indicates that PDP data feedback is to be performed.

[0027] In some implementations, a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0028] In some implementations, an AID field included in a dedicated information field in an NDPA frame indicates that PDP data feedback is to be performed.

[0029] In some implementations, the PDP frame includes a multiple-input multiple-output MIMO control field, which includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0030] In some implementations, the sensing response device selects a portion of the PDP data to be fed back from the generated PDP data based on an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0031] In some implementations, the sensing response device utilizes a PDP report frame to feed back a portion of the PDP data within the generated PDP data.

[0032] In some implementations, the sensing response device feeds back a portion of the PDP data based on the propagation distance of the sensing signal.

[0033] In some implementations, the sensing response device receives an indication from the sensing initiation device about a distance of interest of the sensing signal, and the sensing response device feeds back a portion of the PDP data based on the distance of interest.

[0034] In some implementations, the sensing response device receives an indication of the offset from the sensing initiation device and feeds back a portion of the PDP data based on the distance and offset of interest.

[0035] In some implementations, the sensing response device receives at least one of an indication of a distance or an indication of an offset of interest from the sensing initiation device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating PDP data feedback.

[0036] In some implementations, a trigger dependent information field included in a common information field in a trigger frame indicates at least one of a distance or an offset of interest.

[0037] According to a third aspect of the present disclosure, there is provided a communication method, in which a sensing-initiating device sends an indication of PDP data feedback to a sensing-response device to trigger the sensing-response device to generate PDP data for feedback based on CSI data, and the sensing-initiating device receives a portion of the PDP data from the sensing-response device within the generated PDP data.

[0038] In some implementations, the sensing initiation device sends an indication about the PDP data feedback to the sensing response device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame for indicating the PDP data feedback.

[0039] In some implementations, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed.

[0040] In some implementations, a trigger type field included in a common information field in the trigger frame indicates that PDP data feedback is to be performed.

[0041] In some implementations, a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0042] In some implementations, an AID field included in a dedicated information field in an NDPA frame indicates that PDP data feedback is to be performed.

[0043] In some implementations, the PDP frame includes a multiple-input multiple-output MIMO control field, which includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0044] In some implementations, the sensing initiation device utilizes a PDP report frame to receive a portion of the PDP data from the sensing response device.

[0045] In some implementations, the sensing-initiating device transmits at least one of an indication of a distance or an indication of an offset of interest to the sensing-response device.

[0046] In some implementations, the sensing initiation device transmits at least one of an indication of a distance or an indication of an offset of interest to the sensing response device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame for indicating PDP data feedback.

[0047] In some implementations, a trigger dependent information field included in a common information field in a trigger frame indicates at least one of a distance or an offset of interest.

[0048] According to a fourth aspect of the present disclosure, there is provided a communications apparatus. The apparatus includes a first channel estimation module, a second channel estimation module, and a feedback module. The first channel estimation module is configured to acquire CSI data based on channel estimation using a sensing-response device. The second channel estimation module is configured to generate power delay profile PDP data based on the CSI data using the sensing-response device. The feedback module is configured to feed back a portion of the PDP data within the generated PDP data using the sensing-response device.

[0049] In some implementations, the apparatus further includes a first receiving module configured to receive, using the sensing response device, an indication about the PDP data feedback from the sensing initiation device before the CSI data is obtained based on the channel estimation.

[0050] In some implementations, the second channel estimation module is configured to generate PDP data based on the CSI data in response to receiving an indication for PDP data feedback using a sensing response device.

[0051] In some implementations, the first receiving module is configured to receive an indication about the PDP data feedback from the sensing initiation device using the sensing response device and at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating the PDP data feedback.

[0052] In some implementations, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed.

[0053] In some implementations, a trigger type field included in a common information field in the trigger frame indicates that PDP data feedback is to be performed.

[0054] In some implementations, a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0055] In some implementations, an AID field included in a dedicated information field in an NDPA frame indicates that PDP data feedback is to be performed.

[0056] In some implementations, the PDP frame includes a multiple-input multiple-output MIMO control field, which includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0057] In some implementations, the feedback module is configured to utilize the sensing response device to select a portion of the PDP data to be fed back from the generated PDP data based on an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0058] In some implementations, the feedback module is configured to utilize the sensing response device to feedback a portion of the PDP data within the generated PDP data using the PDP report frame.

[0059] In some implementations, the feedback module is configured to utilize the sensing response device to feed back a portion of the PDP data based on a propagation distance of the sensing signal.

[0060] In some implementations, the apparatus further includes a second receiving module configured to receive, using the sensing response device, an indication of the distance of interest in the sensing signal from the sensing initiating device, and a feedback module configured to utilize the sensing response device to feed back a portion of the PDP data based on at least the distance of interest.

[0061] In some implementations, the second receiving module is configured to utilize the sensing response device to receive an indication of the offset from the sensing initiating device, and the feedback module is configured to utilize the sensing response device to feed back a portion of the PDP data based on the distance and offset of interest.

[0062] In some implementations, the second receiving module is configured to utilize the sensing response device to receive an indication of at least one of the distance or offset of interest from the sensing initiation device utilizing at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating PDP data feedback.

[0063] In some implementations, a trigger dependent information field included in a common information field in a trigger frame indicates at least one of a distance or an offset of interest.

[0064] According to a fifth aspect of the present disclosure, there is provided a communications apparatus including: a first receiving module; and a feedback module. The first receiving module is configured to receive, using a sensing response device, an indication of PDP data feedback from a sensing initiation device. The feedback module is configured, using the sensing response device, to feed back, based on the indication, a portion of PDP data within the PDP data generated based on CSI data.

[0065] In some implementations, the apparatus further includes a first channel estimation module and a second channel estimation module, wherein the first channel estimation module is configured to obtain CSI data based on the channel estimation using a sensing-response device, and the second channel estimation module is configured to generate power delay profile PDP data based on the CSI data using the sensing-response device.

[0066] In some implementations, the first receiving module is configured to receive an indication about the PDP data feedback from the sensing initiation device using the sensing response device and at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating the PDP data feedback.

[0067] In some implementations, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed.

[0068] In some implementations, a trigger type field included in a common information field in the trigger frame indicates that PDP data feedback is to be performed.

[0069] In some implementations, a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0070] In some implementations, an AID field included in a dedicated information field in an NDPA frame indicates that PDP data feedback is to be performed.

[0071] In some implementations, the PDP frame includes a multiple-input multiple-output MIMO control field, which includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0072] In some implementations, the feedback module is configured to utilize the sensing response device to select a portion of the PDP data to be fed back from the generated PDP data based on an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0073] In some implementations, the feedback module is configured to utilize the sensing response device to feedback a portion of the PDP data within the generated PDP data using the PDP report frame.

[0074] In some implementations, the feedback module is configured to utilize the sensing response device to feed back a portion of the PDP data based on a propagation distance of the sensing signal.

[0075] In some implementations, the apparatus further includes a second receiving module configured to receive, using the sensing response device, an indication of the distance of interest from the sensing initiation device, and a feedback module configured to utilize the sensing response device to feed back a portion of the PDP data based on at least the distance of interest.

[0076] In some implementations, the second receiving module is configured to utilize the sensing response device to receive an indication of the offset from the sensing initiating device, and the feedback module is configured to utilize the sensing response device to feed back a portion of the PDP data based on the distance and offset of interest.

[0077] In some implementations, the second receiving module is configured to utilize the sensing response device to receive at least one of an indication of a distance of interest or an indication of an offset from the sensing initiation device utilizing at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating PDP data feedback.

[0078] In some implementations, a trigger dependent information field included in a common information field in a trigger frame indicates at least one of a distance or an offset of interest.

[0079] According to a sixth aspect of the present disclosure, there is provided a communications apparatus including: a first transmitting module; and a third receiving module. The first transmitting module is configured to use a sensing-initiating device to send an indication of PDP data feedback to a sensing-response device to trigger the sensing-response device to generate PDP data for feedback based on CSI data. The third receiving module is configured to use the sensing-initiating device to receive a portion of PDP data from the sensing-response device within the generated PDP data.

[0080] In some implementations, the first transmitting module is configured to use the sensing initiating device to transmit an indication about the PDP data feedback to the sensing response device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame for indicating the PDP data feedback.

[0081] In some implementations, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed.

[0082] In some implementations, a trigger type field included in a common information field in the trigger frame indicates that PDP data feedback is to be performed.

[0083] In some implementations, a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0084] In some implementations, an AID field included in a dedicated information field in an NDPA frame indicates that PDP data feedback is to be performed.

[0085] In some implementations, the PDP frame includes a multiple-input multiple-output MIMO control field, which includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0086] In some implementations, the third receiving module is configured to utilize the sensing initiating device to receive a portion of the PDP data from the sensing responding device utilizing the PDP reporting frame.

[0087] In some implementations, the apparatus further includes a second transmission module configured to utilize the sensing initiation device to transmit at least one of an indication of the distance of interest or an indication of the offset to the sensing response device.

[0088] In some implementations, the second transmission module is configured to utilize the sensing initiation device to transmit at least one of an indication of the distance of interest or an indication of the offset to the sensing response device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame for PDP data feedback.

[0089] In some implementations, a trigger dependent information field included in a common information field in a trigger frame indicates at least one of a distance or an offset of interest.

[0090] According to a seventh aspect of the present disclosure, there is provided a communications device. The device includes a processor. The processor is coupled to a memory that stores instructions. When the instructions are executed by the processor, a method according to the first, second, or third aspect of the present disclosure is performed.

[0091] According to an eighth aspect of the present disclosure, there is provided a computer-readable storage medium. The computer-readable storage medium stores a program. When at least a portion of the program is executed by a processor in a device, the device is enabled to perform a method according to the first, second, or third aspect of the present disclosure.

[0092] According to a ninth aspect of the present disclosure, there is provided a computer program product, the computer program product being tangibly stored on a computer-readable medium and including computer-executable instructions that, when executed, implement the operations of a method according to the first aspect or any one of the implementations of the first aspect of this disclosure, or the operations of a method according to the second aspect or any one of the implementations of the second aspect of this disclosure, or the operations of a method according to the third aspect or any one of the implementations of the third aspect of this disclosure.

[0093] According to a tenth aspect of the present disclosure, there is provided a chip, the chip including a processing circuit configured to perform operations of a method according to the first aspect or any one of the implementations of the first aspect of this disclosure, or to perform operations of a method according to the second aspect or any one of the implementations of the second aspect of this disclosure, or to perform operations of a method according to the third aspect or any one of the implementations of the third aspect of this disclosure.

[0094] It should be understood that the contents described in the Summary of the Invention section are not intended to limit key or important features of this disclosure, nor are they intended to limit the scope of this disclosure. The following description will facilitate an understanding of other features of this disclosure. [Brief explanation of the drawings]

[0095] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent with reference to the following detailed description taken in conjunction with the accompanying drawings, in which like or similar reference numerals indicate like or similar elements. [Figure 1a]Two exemplary scenarios of CSI feedback in WLAN sensing are presented. [Figure 1b] Two exemplary scenarios of CSI feedback in WLAN sensing are presented. [Figure 2] 1 illustrates an exemplary environment in which embodiments of the present disclosure may be implemented. [Figure 3] 1 illustrates a process for performing feedback based on CSI, according to some embodiments of this disclosure. [Figure 4] 1 illustrates an example scenario of WLAN sensing, according to some embodiments of the present disclosure. [Figure 5] 1 shows a PDP versus distance / delay curve according to some embodiments of the present disclosure. [Figure 6] 10 shows a PDP versus distance / delay curve according to some other embodiments of the present disclosure. [Figure 7] 1 is a flowchart for performing feedback based on CSI in a sensing and response device, according to some embodiments of this disclosure. [Figure 8] 1 illustrates an exemplary sensing process according to some embodiments of the present disclosure. [Figure 9a] 1 illustrates an example frame format of a trigger frame according to some embodiments of the present disclosure. [Figure 9b] 1 illustrates an example frame format of a common information field of a trigger frame according to some embodiments of the present disclosure. [Figure 9c] 1 illustrates an example frame structure of a trigger-dependent common information field within a common information field of a trigger frame, according to some embodiments of the disclosure. [Figure 10a] 1 illustrates an example frame format for a Null Data Packet Announcement (NDPA) frame, according to some embodiments of this disclosure. [Figure 10b] 1 illustrates an example frame format of a Station Information 1 field of an NDPA frame, according to some embodiments of this disclosure. [Figure 11] 1 illustrates an example frame structure of an HE multiple-input multiple-output (MIMO) control field, according to some embodiments of this disclosure. [Figure 12] 1 shows the frame structure of the legacy EHT MIMO Control field. [Figure 13] 1 illustrates an example frame structure for an EHT MIMO control field, in accordance with some embodiments of the present disclosure. [Figure 14] 10 is a flowchart for performing feedback based on CSI in a sensing and response device according to some other embodiments of this disclosure. [Figure 15] 10 is a flowchart for performing feedback based on CSI at a sensing-initiating device according to some embodiments of the disclosure. [Figure 16] FIG. 1 is a schematic block diagram of an apparatus structure for performing feedback based on CSI in a sensing-response device, according to some embodiments of the disclosure. [Figure 17] FIG. 1 is a schematic block diagram of the structure of an apparatus for performing feedback based on CSI at a sensing-initiating device, according to some embodiments of the present disclosure. [Figure 18] 1 is a block diagram of a device in which some embodiments of the present disclosure may be implemented. DETAILED DESCRIPTION OF THE INVENTION

[0096] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Although several embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that the present disclosure can be thoroughly and completely understood. It should be understood that the accompanying drawings and the embodiments of the present disclosure are merely used as examples and are not intended to limit the scope of protection of the present disclosure.

[0097] As used herein, the term "including" and variations thereof are intended to openly include, specifically "including but not limited to." The term "based on" means "based at least in part on." The term "in one embodiment" means "at least one embodiment," and the term "in another embodiment" means "at least one other embodiment." Other terms are defined in the description below.

[0098] Although the terms "first" and "second" may be used herein to describe various components, it should be understood that these components should not be limited by these terms. These terms are used only to distinguish one component from another. As used in this specification, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0099] As explained above, WLAN sensing is implemented in a manner in which sensing is performed based on CSI. Figures 1a and 1b show two exemplary scenarios 100 and 105 of CSI feedback in WLAN sensing.

[0100] In the scenario 100 shown in Fig. 1a, a station (STA) 110 acts as a sensing initiator for initiating a sensing procedure and as a receiver for receiving a sensing signal in the sensing procedure, and STAs 115 and 120 act as sensing responders that respond to and participate in the sensing procedure initiated by the sensing initiator and as transmitters for transmitting a sensing signal in the sensing procedure. As shown in Fig. 1a, STA 110 transmits a trigger frame to STAs 115 and 120 (125, 130), and STAs 115 and 120 transmit a sensing physical layer protocol data unit (sensing PPDU) to STA 110 (135, 140). STA 110 receives the sensing PPDU and performs environment / channel measurements to acquire CSI.

[0101] In the scenario 105 shown in Fig. 1b, the STA 110 acts as a sensing initiator and transmitter, and the STAs 115 and 120 act as sensing responders and receivers. As shown in Fig. 1b, the STA 110 transmits a sensing PPDU to the STAs 115 and 120 (145, 150), and the STAs 115 and 120 receive the sensing PPDU, perform environment / channel measurements, and feed back the CSI obtained through the measurements to the STA 110 (155, 160). This is explicit CSI feedback.

[0102] Currently, there are two conventional explicit CSI feedback methods in the 802.11 standard, including CSI matrix feedback and compressed CSI feedback. The CSI matrix is ​​usually a complete CSI matrix, containing all channel state information obtained through measurements. Operations based on the CSI matrix can successfully implement target sensing. However, due to overhead teaching, the CSI matrix is ​​only used in 802.11n and is no longer used after 802.11ac.

[0103] Compressed CSI is a CSI feedback method introduced after 802.11ac. In this method, singular value decomposition (SVD) is performed on the CSI matrix, and then a rotation angle solution (e.g., Givens Rotation decomposition) is performed on the resulting right singular matrix V, and the resulting angle is fed back. For example, the angle value obtained through the decomposition may be quantized based on a specified number of bits and then transmitted. Compressed CSI can be used to support multiple-input multiple-output (MIMO) precoding, thereby improving data transmission efficiency. However, some information is lost in the above angle calculation process. Therefore, it cannot effectively support WLAN sensing.

[0104] An embodiment of the present disclosure provides a new WLAN sensing compressed feedback mechanism. According to this mechanism, after obtaining CSI data based on channel estimation, when feeding back CSI in a sensing process initiated by a sensing initiation device, a sensing response device generates power delay profile (PDP) data based on the CSI data. The PDP data may reflect the relationship between energy and delay or distance in the propagation path of the sensing signal, and is also referred to as an energy-delay image. The sensing response device feeds back a portion of the PDP data within the generated PDP data. The PDP data may be fed back to the sensing initiation device or to other participants in the sensing process. For example, if another device acts as a sensing transmitter, the sensing response device may feed back the PDP data to the corresponding sensing transmitter.

[0105] In this way, the sensing transmitter can sense targets in the propagation path of the sensing signal based on part of the received PDP data. In this manner, the overhead for CSI feedback can be significantly reduced and the sensing performance can be guaranteed to a certain extent.

[0106] In the following description, PDP data may also be referred to as Channel Impulse Response (CIR) data. In other words, in this disclosure, the terms "PDP data" and "CIR data" have the same physical meaning and may be used equivalently.

[0107] FIG. 2 illustrates an exemplary environment 200 in which embodiments of the present disclosure may be implemented.

[0108] As shown in FIG. 2 , environment 200 is part of a wireless local area network and includes one sensing initiation device 210 and two sensing response devices 220 and 230. In this example, sensing initiation device 210 and sensing response devices 220 and 230 are all STAs. This should be understood as merely an example rather than a limitation. Depending on the particular implementation and scenario, sensing initiation device 210 and sensing response devices 220 and 230 may be any one of STAs or access points (APs). Sensing initiation device 210 and sensing response devices 220 and 230 may be implemented by any suitable device, including an AP and a STA, such as, but not limited to, a communication server, a router, a switch, a bridge, a computer, or a mobile phone.

[0109] It should also be understood that environment 200 depicts one sensing-initiating device and two sensing-responding devices for illustrative purposes only. Thus, the scenario of multiple sensing-responding devices and one sensing-initiating device (FIG. 2) is utilized as an example to describe embodiments of the present disclosure. However, embodiments of the present disclosure may be extended to apply to scenarios of multiple sensing-responding devices and multiple sensing-initiating devices.

[0110] In environment 200, sensing initiation device 210 may communicate wirelessly with sensing response devices 220 and 230. The communications may conform to any suitable communications technology and corresponding communications standard.

[0111] In some embodiments of this disclosure, in a WLAN sensing process, the sensing response device 220 or 230 receives a sensing signal transmitted by a transmitter and performs channel estimation to obtain CSI data. The sensing signal may be implemented by any appropriate signal. As an example, the sensing signal may be implemented by sensing a physical layer protocol data unit (PPDU). For example, the transmitter may transmit a null data packet (NDP) as the sensing signal. Alternatively, the transmitter may transmit a data packet containing valid data as the sensing signal. Alternatively, the sensing signal may be another signal known to both the receiving and transmitting parties. When CSI needs to be fed back, the sensing response device 220 converts the obtained CSI data into PDP data and uses a portion of the PDP data for CSI feedback in WLAN sensing.

[0112] For ease of explanation, some embodiments of this disclosure will be described using an example in which the sensing-initiating device 210 is utilized as a sensing transmitter. However, it should be understood that this is merely an example and not a limitation. Any suitable device may act as a sensing transmitter for transmitting a sensing signal. By way of example, the sensing-initiating device 210 may be utilized as a sensing transmitter. In some embodiments, alternatively, the sensing-response device 220 or 230 may perform both transmission and reception and serve as both a sensing transmitter and a sensing receiver. Alternatively or additionally, one sensing device 220 may be utilized as a sensing transmitter and the other sensing device 230 may be utilized as a sensing receiver.

[0113] The sensing response device 220 or 230 feeds back only a portion of the PDP data generated based on the CSI data, thereby significantly reducing feedback overhead. In addition, since the PDP data can reflect the fading conditions of the propagation paths of the sensing signals with different delays or distances, the PDP data can be effectively used in WLAN sensing to guarantee sensing performance to a certain extent.

[0114] 3 illustrates a process 300 for performing feedback based on CSI, according to some embodiments of the present disclosure. For ease of explanation, the process 300 will be described below with reference to FIG.

[0115] 3, in process 300, the sensing-initiating device 210 sends (305) an indication for PDP data feedback to the sensing-response device 220 (or the sensing-response device 230) to instruct the sensing-response device 220 to feedback PDP data. The indication may be conveyed explicitly or implicitly by any appropriate message or field. The following describes embodiments of this aspect in detail.

[0116] After receiving the indication, the sensing response device 220 (or the sensing response device 230) feeds back (310) the PDP data to the sensing initiation device 210. In some embodiments, the sensing response device 220's feedback of the PDP data may not be triggered by a feedback indication from the sensing initiation device 210. For example, the sensing response device 220 may periodically feed back the PDP data to the sensing initiation device 210 or may feed back the PDP data to the sensing initiation device 210 autonomously.

[0117] In the PDP data feedback process, the sensing response device 220 may first obtain CSI data based on channel estimation, then generate PDP data based on the CSI data, and feed back part of the PDP data to the sensing initiation device 210. A specific example will be described below.

[0118] In this example, the sensing signal is implemented using an OFDM signal. In this case, the relative relationship a between frequency-domain subcarriers CSI obtained through estimation based on the received sensing signal satisfies the following equation:

[0119]

number

[0120] In the above equation, Δf represents the subcarrier spacing, K represents the number of subcarriers, and τ1 represents the propagation delay corresponding to the first path. For simplicity, the energy on each subcarrier is represented as 1.

[0121] An inverse Fourier transform (IFT) operation is performed on the CSI in the above equation to obtain the amplitude, which may yield the corresponding PDP data. In some embodiments, an inverse fast Fourier transform (IFFT) operation is utilized to accelerate the calculation. The PDP reflects the relationship between multipath power (or energy) and delay / distance. For example, if the multipath delay is τ, a peak appears at the corresponding propagation delay τ or distance τ×c (where c represents the propagation speed of electromagnetic waves or the speed of light), indicating that there is energy at that delay (i.e., the path). Correspondingly, targets present in the propagation path may be sensed based on the PDP data.

[0122] Examples of feedback processes that may be utilized by sensing response device 220 or 230 are described below with reference to FIGS.

[0123] 4 illustrates an exemplary scenario 400 of WLAN sensing, in accordance with some embodiments of the present disclosure. In the scenario 400, there is a target 405 to be sensed. Thus, a sensing signal from a sensing transmitter 410 to a sensing receiver 415 travels through at least two paths during propagation. One is a direct path 420 between the sensing transmitter 410 and the sensing receiver 415. The other is a reflected path through the target 405, including a path 425 from the sensing transmitter 410 to the target 405 and a path 430 from the target 405 to the sensing receiver 415.

[0124] Under simple conditions, the distance resolution ΔR of the sensing signal is inversely proportional to the bandwidth and satisfies the following equation:

[0125]

number

[0126] c represents the propagation speed of electromagnetic waves / speed of light, B represents the equivalent bandwidth of the signal, and β represents the included angle formed by the transmitter, target, and receiver, such as the included angle 435 shown in FIG. 4, which is sometimes referred to as the bistatic angle in radar.

[0127] In scenario 400, the sensing transmitter 410 and the sensing receiver 415 are two separate devices; that is, reception and transmission are separated. In some embodiments, one device may transmit and receive the sensing signal and act as both a transmitter and a receiver; that is, transmission and reception are performed at the same location. In this case, β=0, and the range resolution is

[0128]

number

[0129] It can be seen that in the case where a device performs both transmission and reception, the range resolution is smallest. In the case where reception and transmission are separated, the range resolution is affected by the included angle β formed by the transmitter, target, and receiver, and will always be greater than the range resolution in the case where one device performs both transmission and reception.

[0130] For example, if the bandwidth of the sensing signal (e.g., NDP) is 20 MHz, the distance resolution ΔR of sensing when transmitting and receiving by one device is 7.5 m (greater than 7.5 m in a scenario where receiving and transmitting are separated). In this case, the PDP data shown in FIG. 5 can be obtained by performing IFT processing (without adding zeros) on Equation 1 above to obtain the amplitude. In curve 500 shown in FIG. 5, the horizontal axis represents distance / time, and points 505 on the horizontal axis represent multiples of distance / delay units. For example, the distance unit is c / 2B and the delay unit is 1 / 2B.

[0131] The distance range of a typical application scenario of WLAN sensing is about 10 m. In other words, the range of interest corresponds to information in the first two distance units. Thus, in most WLAN sensing scenarios, only information in the first few distance units (e.g., which may be expressed as complex numbers) needs to be selected for feedback after IFFT processing. For example, the number N of distance units for feedback may be selected according to the following formula:

[0132]

number

[0133] It should be understood that the number of distance units N for feedback is a positive integer greater than 0. Thus, Equation 4 above is equivalent to the following equation:

[0134]

number

[0135] In some embodiments, an offset such as a synchronization error can cause an offset in the PDP, as shown in Figure 6. Compared to Figure 5, the PDP is offset entirely to the right in the PDP vs. distance / delay curve 600 shown in Figure 6. In this case, the offset can be taken into account when information in distance units is fed back. For example, information in several more distance units can be fed back.

[0136] In the following, we will explain in detail how to select and feed back PDP data in the case of PDP offset.

[0137] In some embodiments, the number of distance units for feedback (i.e., N feedback The number of complex sampling points for feedback (denoted as N) is determined by both the distance and offset of interest. Specifically, the number of complex sampling points for feedback, N feedback is a first number (denoted as N) related to the distance of interest and a second number (denoted as N) related to the offset. off Furthermore, the number of complex sampling points for feedback, N feedback is the first number N and the second number N feedback It is the sum of.

[0138] In some embodiments, the point with the largest amplitude after the IFT / IFFT is selected as the feedback reference point (as shown in FIG. 6, sampling point 610 is selected as the reference point). Furthermore, a first number N of sampling points (which may or may not include the reference point) associated with the distance of interest is selected backward. A second number N of sampling points (which may or may not include the reference point) associated with the offset is selected backward. off is selected forward.

[0139] Furthermore, the reference points are typically utilized as sampling points for which feedback is required. In some embodiments, the reference points are considered to be part of a first number N of sampling points. Optionally, in some other embodiments, the reference points are considered to be part of a second number N of sampling points. off are considered as part of the sampling points.

[0140] In an exemplary embodiment, the reference point is considered to be part of a first number N of sampling points, where the first number N is related to the distance of interest and the second number N is related to the offset. off It is calculated as follows:

[0141]

number

[0142] In another exemplary embodiment, the reference points are a second number N off are considered as part of sampling points, where a first number N relates to the distance of interest and a second number N relates to the offset. off It is calculated as follows:

[0143]

number

[0144] In some embodiments, the successive feedback length (i.e., the number of complex sampling points N corresponding to successive index values) feedback ) is transmitted to the sensing initiator. Additionally, in some embodiments, the feedback information may further include an index of the reference point, so that the sensing initiator may know the absolute position of the feedback sampling point in the coordinate system.

[0145] the distance of interest for determining the first number N and the second number N off It should be understood that the offset for determining the distance and offset may be obtained in any manner by the sensing initiator and / or sensing responder, and this is not a limitation in this disclosure. In an exemplary embodiment, one or more of a sensing trigger frame, a sensing NDPA frame, and a sensing request / response frame may be utilized to communicate the distance and offset of interest.

[0146] In some embodiments, a first number N related to the distance of interest and a second number N related to the offset off can be determined based on a pre-configured correspondence relationship. For example, based on actual requirements, the following relationship can be determined: a first correspondence relationship related to a first number N and a second correspondence relationship related to a second number N off may be maintained at the sensing initiator and the sensing responder.

[0147] Furthermore, the corresponding elements that need to be maintained are determined based on whether the first correspondence or the second correspondence is maintained. For example, when the first correspondence is maintained, the elements that are maintained include the first number N and the distance of interest. Similarly, when the second correspondence is maintained, the elements that are maintained include the second number N. off and offset.

[0148] In some embodiments, the unique identifier (ID) information is a different N / N off may be assigned to each of the values, for example, first ID information (corresponding to the first number N) and off In this case, the first ID information and the second ID information may also be used as elements in a maintained correspondence relationship. For example, the first correspondence relationship indicates a correspondence relationship between the first number N and the first ID information, and the second correspondence relationship indicates a correspondence relationship between the second number N off and the second ID information.

[0149] In some embodiments, the first ID information and the second ID information are bit sequences. Further, in some embodiments, the bit size of the bit sequence of the first ID information is determined based on the maximum supported distance of interest and the maximum supported number of feedback sampling points (N max Similarly, in some embodiments, the bit size of the bit sequence of the second ID information is determined by at least one of the maximum offset supported and the maximum number of feedback sampling points supported (N max-off and (denoted as

[0150] In a specific embodiment, the bit size of the bit sequence of the first ID information is directly proportional to the maximum supported distance of interest / maximum supported number of feedback sampling points.

[0151] In some embodiments, the maximum number of supported feedback sampling points N max are consecutive integers, the bit size of the bit sequence of the first ID information is the maximum number of supported feedback sampling points N max It is calculated based on, for example,

[0152]

number

[0153] Optionally, in some other embodiments, the maximum number of supported feedback sampling points N max If x is a consecutive integer, the bit size of the bit sequence of the first ID information can be calculated based on the maximum supported distance of interest.

[0154] When the reference point is considered as part of the first number N of sampling points,

[0155]

number

[0156] When the reference point is not considered as part of the first number N of sampling points,

[0157]

number

[0158] Similarly, in some embodiments, the bit size of the bit sequence of the second ID information is the maximum supported offset divided by the maximum number of supported feedback sampling points (N max-off is directly proportional to the

[0159] In some embodiments, the maximum number of supported feedback sampling points N max-off is a consecutive integer, the bit size of the bit sequence of the second ID information is the maximum number of supported feedback sampling points N max-off It is calculated based on, for example,

[0160]

number

[0161] Optionally, in some other embodiments, the maximum number of supported feedback sampling points N max-off If , are consecutive integers, the bit size of the bit sequence of the second ID information can be calculated based on the maximum supported offset. An example is as follows:

[0162] The reference point is a second number N off When considered as part of sampling points,

[0163]

number

[0164] The reference point is the second number N off When not considered part of the sampling points,

[0165]

number

[0166] It should be understood that the above method for calculating the bit size of the bit sequence of the first / second ID information is merely an example. In other embodiments, for example, the maximum number of supported feedback sampling points N / N max-off When is a set of non-contiguous integer discrete values, the bit size of the bit sequence of the first / second ID information bit sequence can be adjusted based on the number of discrete value sets.

[0167] Furthermore, since the number of sampling points for feedback is directly proportional to the sensing PPDU bandwidth, in some embodiments, when the sensing PPDU bandwidth is further increased, the number of sampling points for feedback (e.g., the first number N and the second number N off) may be expressed as a function of bandwidth. In some embodiments, the number of sampling points for feedback corresponding to a reference bandwidth (e.g., 20 MHz) is determined by the reference value (N ref ) and the number of points for feedback (N PPDF ) is determined based on the relationship between the sensing PPDU bandwidth and the reference bandwidth. For example, N PPDF =N ref ×N B where N B = Sensing PPDU Bandwidth / Reference Bandwidth.

[0168] Reference Bandwidth, Sensing PPDU Bandwidth, and / or N B It should be understood that the sensing initiator and the sensing responder may know the sensing initiator and the sensing responder.

[0169] Table A below describes an example of the first correspondence.

[0170] [Table 1]

[0171] Table B below describes an example of the second correspondence.

[0172] [Table 2]

[0173] In some other embodiments, Table A has the following variations:

[0174] [Table 3]

[0175] In a specific embodiment of Table A (or Table A-1) and Table B, the reference point is used as part of the first number N, the reference bandwidth is 20 MHz, and N B is the multiple of the sensing PPDU bandwidth relative to the 20 MHz reference bandwidth (i.e., sensing PPDU bandwidth / 20 MHz reference bandwidth), and the distance resolution ΔR is 7.5 m. It should be understood that the above values ​​are for illustrative purposes only. In other embodiments, specific values ​​can be determined based on actual requirements, which is not limited in this disclosure.

[0176] It should further be understood that as the maximum supported distance of interest increases / decreases, Table A (or Table A-1) may include more / fewer entries, and the bit size of the first ID information may increase / decrease accordingly. Similarly, as the maximum supported offset increases, Table B may include more entries, and the bit size of the second ID information may increase accordingly. In some embodiments, the bit size of the first ID information depends on the number of entries included in Table A, and the bit size of the second ID information depends on the number of entries included in Table B.

[0177] It should be further understood that any one of the elements "First ID Information," "Number of Complex Samples," and "Distance of Interest" does not necessarily need to be included in Table A (or Table A-1) and may be omitted based on actual requirements. Similarly, any one of the elements "Second ID Information," "Number of Complex Samples," and "Offset" may be omitted based on actual requirements in Table B. For example, the sensing initiator and / or sensing responder may maintain only the first and second columns in Table A (or Table A-1) and Table B.

[0178] Based on the correspondence between Table A (or Table A-1) and Table B, the sensing initiator and / or sensing responder may determine the number of corresponding feedback sampling points. For example, when the PPDU bandwidth is 20 MHz, the distance of interest is 10 m, and the offset is 5 m, the first number N related to the distance of interest and the second number N related to the offset are: off may be determined to be 2+1 and 1, respectively.

[0179] Furthermore, table A (or table A-1) and table B may be joined to generate table C, where the individual table C indicates the correspondence. An example is as follows:

[0180] [Table 4]

[0181] It should be understood that the above Table C is for illustrative purposes only. When the correspondence is maintained using separate tables, the form of the tables may be adjusted based on actual requirements (e.g., corresponding elements in Tables A, A-1, and B may be added, deleted, or merged). Furthermore, it should be understood that the bit size of the third ID information depends on the number of entries contained in Table C.

[0182] In some embodiments, the first ID information, the second ID information, and / or the third ID information are communicated by the sensing initiator and / or the sensing responder, such that the sensing responder receives a first number N, a second number N, off , and / or the number of complex sampling points for feedback, N feedbackThe first ID information, the second ID information, and / or the third ID information may be determined. It should be understood that the first ID information, the second ID information, and / or the third ID information may be acquired by the sensing initiator and / or the sensing responder in any manner. This is not limited in this disclosure. In an exemplary embodiment, a sensing trigger frame, a sensing NDPA frame, and a sensing request / response frame may be utilized to exchange the first ID information and the second ID information. Additionally, in some embodiments, the feedback information may further include an index of a reference point, thereby allowing the sensing initiator to know the absolute position of the feedback sampling point in a coordinate system.

[0183] Optionally, in some embodiments, a portion of the sample values ​​in the feedback interval are fed back using multiple non-contiguous segments (also referred to as segmented feedback scheme), i.e., the total feedback length (e.g., N+N off In other words, the feedback sampling points correspond to multiple segments in the feedback interval, the multiple segments are not consecutive, and the maximum span distance of each segment is less than the total feedback length (e.g., N+N off +1).

[0184] In some embodiments, the feedback information includes values ​​of sampling points in the plurality of segments and first information indicating a relative relationship between the plurality of consecutive segments. It should be understood that the first information may be determined based on actual requirements, and may be a start index or an end index of the segment, or an interval between the segments (i.e., the number of feedback null defects between two adjacent segments), or may be omitted in some cases.

[0185] In a specific embodiment, the first information is a start index and / or an end index corresponding to each of the multiple segments. In another specific embodiment, the first information is a start index of a first segment in the multiple segments and a segment interval between the multiple segments. In another specific embodiment, the first information is a combination of a start index and an end index of a segment and the interval between the segments. For example, the relative positions of some segments are indicated using the start index and the end index of the segment, and the relative positions of other segments are indicated using the interval between the segments.

[0186] Optionally, in some embodiments, a plurality of discrete points (also referred to as a discrete feedback scheme) is utilized to feed back a number of sample values ​​in a feedback interval. For example, the feedback information is a number of sampling points in the feedback interval. In some embodiments, the feedback information is a value corresponding to a selected discrete sampling point and second information indicating the positions of the plurality of discrete sampling points.

[0187] In a specific embodiment, the second information is an index value of the selected discrete sampling point. In another specific embodiment, when the distance between two adjacent discrete points is greater than 1, the second information can also be expressed as the interval between the two adjacent discrete points. In another specific embodiment, the second information is a combination of the index value of the discrete sampling point and the interval between the two adjacent discrete points. For example, the relative positions of some sampling points are indicated using the index value of the sampling point, and the relative positions of other segments are indicated using the interval between two adjacent discrete points.

[0188] Optionally, in some embodiments, a combination of segmented and discrete feedback schemes may be utilized.

[0189] It should be understood that the above feedback methods provided in this disclosure are merely examples. In other embodiments, information can be fed back to the sensing initiator in any manner, allowing the sensing initiator to know the values ​​and positional relationships of the feedback sampling points. The specific form of expression of the feedback information is not limited in this disclosure.

[0190] In some embodiments, the sensing transmitter may utilize cyclic shift diversity (CSD) in transmission, in which case the sensing receiver may perform CSD cancellation on the CSI obtained through measurements and then perform subsequent PDP data calculation and feedback.

[0191] FIG. 7 is a flowchart of a method 700 for performing feedback based on CSI at a sensing response device 220 or 230, according to some embodiments of the disclosure.

[0192] 7, in block 705, the sensing response device 220 or 230 receives an indication of PDP data feedback from the sensing initiation device 210. The indication may be implemented in any suitable manner. An example implementation of the indication of PDP data feedback according to some embodiments of the present disclosure is described below with reference to FIG.

[0193] FIG. 8 illustrates an example sensing process 800 according to some embodiments of the disclosure.

[0194] 8, the sensing process 800 includes a discovery stage 805, a configuration stage 810, a measurement stage 815, and a feedback stage 820. In the discovery stage 805, the sensing initiation device 210 transmits a sensing request (SENS. request) frame 825, and the sensing response devices 220 and 230 respond with sensing response (SENS. response) frames 830 and 835 to exchange information such as device capabilities.

[0195] In the setting stage 810, the sensing initiation device 210 transmits an announcement frame 840 to assign sensing roles (e.g., transmitter and receiver), specify a transmission period for the sensing signal, etc. In this example, the sensing initiation device 210 is used as a transmitter of the sensing signal, and the sensing response devices 220 and 230 are used as receivers of the sensing signal. The sensing response devices 220 and 230 respond with confirmation frames 845 and 850.

[0196] In the measurement stage 815, the sensing initiation device 210 transmits a sensing PPDU, and the sensing response devices 220 and 230 receive the sensing PPDU and perform channel or environment measurements accordingly. In this example, the sensing initiation device 210 transmits an NDP 855 as a sensing signal to the sensing response devices 220 and 230. The sensing initiation device 210 also transmits a Null Data Packet Announcement (NDPA) frame 860.

[0197] In the feedback stage 820, the sensing initiation device 210 sends a trigger frame 865 to trigger the sensing response devices 220 and 230 to perform CSI-based feedback. The sensing response devices 220 and 230 perform corresponding processing on the CSI obtained through measurement according to the compression scheme described in the embodiments of this disclosure, and feedback PDP data 870 and 875.

[0198] In this example, the sensing initiation device 210 may use the trigger frame 865, the NDPA frame 860, and / or the announcement frame 840 to transmit an indication about the PDP data feedback to the sensing response devices 220 and / or 230. The indication may be transmitted by reusing existing fields in the above frames or by using new fields. In some embodiments, the PDP frames may be specifically designed to indicate the PDP data feedback.

[0199] Below, with reference to Figures 9a, 9b, and 9c, an exemplary implementation is described in which the sensing initiation device 210 uses a trigger frame 865 in the feedback stage 820 to send an indication related to PDP data feedback to the sensing response device 220 or 230.

[0200] FIG. 9a illustrates an example frame format 900 of a trigger frame according to some embodiments of the disclosure.

[0201] As an example, an indication for PDP data feedback may be sent using the Common Info field 905 of the trigger frame or a dedicated information field such as the STA Info 1 field 910. The indication may be sent by reusing any field in the Common Info field 905 and the dedicated information field, or by designing a new field.

[0202] 9b illustrates an exemplary frame format of a common information field 905 of a trigger frame according to some embodiments of the present disclosure. As an example, a Trigger Type field 915 included in the common information field 905 of the trigger frame may indicate that PDP data feedback is to be performed. For example, a new trigger type named PDP Report Poll may be added to indicate sensing PDP data feedback. Table 1 below describes exemplary values ​​of the Trigger Type field.

[0203] [Table 5]

[0204] Correspondingly, when receiving a trigger frame with a trigger type field value of 8, the sensing response device 220 or 230 may determine that the sensing initiation device 210 is requesting the sensing response device to feed back PDP data.

[0205] In some embodiments, the sensing initiating device 210 may also indicate a distance and / or offset of interest in the sensing signal to the sensing response device 220 or 230. For example, the Trigger Dependent Common Info field 920 in the common information field 905 shown in FIG. 9b may indicate the distance and / or offset of interest.

[0206] 9c illustrates an example frame structure of a trigger-dependent common information field 920 within the common information field 905 of a trigger frame, in accordance with some embodiments of this disclosure. In this example, the trigger-dependent common information field 920 includes a Range of Interested field 925 and an Offset field 930.

[0207] Table 2 below describes exemplary values ​​for the distance of interest field 925. In this example, if the reference bandwidth of the sensing signal is 20 MHz, the distance resolution ΔR of sensing when transmitting and receiving by one device is 7.5 m. If the bandwidth of the sensing signal is greater than 20 MHz, the corresponding number N of PDP data for feedback is described in the last column in Table 2, where N can be expressed as a function of the bandwidth B of the sensing signal.

[0208] [Table 6]

[0209] Table 3 below describes the number of PDP data for feedback, taking into account the offset indicated in the offset field 930.

[0210] [Table 7]

[0211] In some embodiments, the value of the offset field 930 may be the same among multiple transmit-feedback iterations of the sensing process. In some other embodiments, a larger value may be used at the beginning stage of the sensing process to ensure correct feedback of channel / environment information. The offset value may be gradually reduced according to a predetermined law among multiple transmit-feedback iterations to ensure correct feedback of channel / environment information and to reduce the amount of feedback.

[0212] The sensing initiation device 210 and the sensing response devices 220 and 230 exchange relevant information using trigger frames in the feedback stage 815, and the information exchange may be performed using NDPA frames in the measurement stage 815. An exemplary implementation in which an indication related to PDP data feedback is sent using NDPA frames 860 in the configuration stage 810 is described below with reference to Figures 10a and 10b.

[0213] FIG. 10a illustrates an example frame format 1000 of an NDPA frame according to some embodiments of this disclosure.

[0214] As an example, an indication about PDP data feedback may be sent using dedicated information fields of the NDPA frame, such as the Sounding Dialog Token field 1005 or the Station Info 1 field 1010. The indication may be sent by reusing any field in the Sounding Dialog Token field 1005 and the Station Info 1 field 1010, or by designing a new field.

[0215] FIG. 10b illustrates an exemplary frame format of the Station Information 1 field 1010 of an NDPA frame, according to some embodiments of this disclosure.

[0216] In this example, an 11-bit identifier (AID11) field 1015 in the station information 1 field 1010 is utilized to transmit an indication for PDP data feedback. The station information 1 field 1010 may further include a range of interest field 1020 and an offset field 1025.

[0217] Indications related to PDP data feedback may be transmitted by reusing existing fields of the HE NDPA frame in the Wi-Fi 6 standard. Table 4 describes exemplary definitions of relevant fields of the HE NDPA frame.

[0218] [Table 8]

[0219] Alternatively, the indication related to PDP data feedback may be transmitted by reusing existing fields of the EHT NDPA frame in the Wi-Fi 7 standard. Table 5 describes exemplary definitions of fields in the EHT NDPA frame for transmitting indications related to PDP data feedback.

[0220] [Table 9]

[0221] Additionally, the announcement frame 840 may alternatively be utilized to provide indications related to PDP data feedback in the configuration stage 810. The corresponding indications may be sent by reusing existing fields in the announcement field or by designing new fields. For example, a distance of interest field and an offset field may be configured in the announcement field to indicate the distance and offset of interest.

[0222] Alternatively, in some embodiments, a dedicated PDP frame may be designed to provide indications related to PDP data feedback. An exemplary HE PDP frame is described below. A new type may be added to the HE Action field, as described in Table 6.

[0223] [Table 10]

[0224] As described in Table 6, when the value of the HE action field is 3, it indicates that the frame is a HE PDP frame. Table 7 describes example values ​​of the HE PDP frame action field. As described in Table 7, when the value of the PDP frame action field is 3, it indicates that the frame carries HE MIMO control information. When the value of the PDP frame action field is 4, it indicates that the frame carries HE PDP report information, so that the sensing response device 220 or 230 feeds back PDP data to the sensing initiation device 210. Details are described below.

[0225] [Table 11]

[0226] The HE MIMO control field may be designed based on the existing HE frame structure. In the HE PDP frame, some fields in the HE MIMO control field are reserved. Figure 11 shows an example frame structure 1100 of the HE MIMO control field according to some embodiments of this disclosure. The meanings of the fields are described in Table 8 below.

[0227] [Table 12]

[0228] It may be appreciated that by utilizing the HE MIMO control field, the sensing initiation device 210 may indicate to the sensing response device 220 or 230 which portions of the PDP data are to be fed back.

[0229] An exemplary EHT PDP frame is described below: As described in Table 9, a new type may be added to the EHT Action field.

[0230] [Table 13]

[0231] As described in Table 10, when the value of the EHT Action field is 1, it indicates that the frame is an EHT PDP frame. Table 10 describes example values ​​for the EHT PDP Frame Action field. As described in Table 11, when the value of the PDP Frame Action field is 3, it indicates that the frame carries EHT MIMO control information. When the value of the PDP Frame Action field is 4, it indicates that the frame carries EHT PDP reporting information. Details are described below.

[0232] [Table 14]

[0233] The EHT MIMO control field may be designed based on the existing EHT frame structure, as illustrated in Figure 12. In the EHT PDP frame, some fields in the EHT MIMO control field are reserved.

[0234] 13 illustrates an example frame structure 1300 for an EHT MIMO control field, according to some embodiments of this disclosure. The meaning of the fields is explained in Table 11 below.

[0235] [Table 15]

[0236] PDP frames providing indications related to PDP data feedback may be transmitted by the sensing initiation device 210 to the sensing response devices 220 and 230 in the feedback stage 820, measurement stage 815, and configuration stage 810, thereby providing greater flexibility.

[0237] 7, the sensing response device 220 or 230 feeds back a portion of the PDP data in the generated PDP data in block 710. Exemplary processing of the PDP data fed back by the sensing response device 220 or 230 is described below with reference to FIG.

[0238] FIG. 14 is a flowchart of a method 1400 for performing feedback based on CSI in a sensing response device 220 or 230, according to some embodiments of the disclosure.

[0239] As shown in FIG. 14 , in block 1405, the sensing-response device 220 or 230 obtains CSI data based on channel estimation. Any suitable channel estimation technique currently known or developed may be utilized herein, and the scope of this disclosure is not limited to this aspect. In block 1410, the sensing-response device 220 or 230 generates PDP data based on the CSI data. By way of example, the PDP data may be generated through an IFT or an IFFT. Any other suitable method of generating PDP data based on the CSI data may alternatively be utilized.

[0240] At block 1415, the sensing response device 220 or 230 feeds back a portion of the PDP data in the generated PDP data. In some embodiments, the portion of the PDP data may be fed back based on the propagation distance of the propagation path of the sensing signal. For example, the sensing response device 220 or 230 may select PDP data corresponding to a propagation path whose propagation distance is equal to or less than a predetermined threshold as the PDP data to be fed back. The threshold may be predefined or dynamically configured. For example, as described above, the sensing initiation device 210 may transmit an indication of a distance of interest to the sensing response device 220 or 230 using, for example, a trigger frame, an NDPA frame, or an announcement frame. In response, the sensing response device 220 or 230 may use the distance of interest as a threshold and feed back PDP data corresponding to a propagation distance equal to or less than the distance of interest.

[0241] In some embodiments, the sensing response device 220 or 230 may alternatively feed back PDP data based on the offset. For example, the sensing response device 220 or 230 may receive an indication of the offset from the sensing initiation device 210. The sensing response device 220 or 230 may then determine the PDP data to feed back based on the distance and offset of interest.

[0242] For example, in a MIMO scenario, after the sensing response device 220 or 230 receives an indication for PDP feedback from the sensing initiation device 210, IFFT processing may be performed for channel estimation of each stream on each receiving channel, and then the first few data of length L (as described in Table 3) are selected for feedback.

[0243] In some other embodiments, as described above, in a MIMO scenario, the sensing-initiating device 210 may utilize a MIMO control field in a dedicated PDP frame to indicate to the sensing-response device 220 or 230 which PDP data to feed back. In these embodiments, the sensing-response device 220 or 230 may select the PDP data to feed back according to the indication in the MIMO control field.

[0244] For example, as illustrated in Tables 8 and 11, the dimensions of the PDP matrix to be fed back are generally N STS × Nr × L, where N STS represents the number of space-time streams, Nr represents the number of receiving channels of the receiver, and L represents the length of the data to be fed back after IFFT processing is performed for each stream on each receiving chain. The format of the feedback data is encoded as follows: Each space-time stream (1,...,N STS , total N STS ) contains the following information: The feedback matrix contains Nr (1,...,Nr, Nr in total) rows, each containing the following information: It includes L (1, ..., L, a total of L) complex numbers, and for each complex number, quantization transmission is performed based on the real part (Nb bits) and the imaginary part (Nb bits). } }

[0245] Nb may correspond to the codebook information / coefficient size (3 bits) in the MIMO control field in Tables 8 and 11.

[0246] Sensing response device 220 or 230 may use the PDP report information to feedback PDP data. For example, for an HE PDP frame, as described in Table 7, the value of the PDP frame action field may be set to 4 to indicate that the current frame carries HE PDP Report information. For an EHT PDP frame, as described in Table 10, when the value of the PDP frame action field is 4, it indicates that the frame carries EHT PDP Report information. Exemplary information included in the PDP report information is described in Table 12.

[0247] [Table 16]

[0248] Nb represents the quantization bits, L represents the length of the complex number fed back after IFFT processing (described in Table 3), Nr represents the number of receiving channels of the device for transmitting matrix sensing receiver / report, and N STS represents the number of spatiotemporal streams.

[0249] As described above with reference to FIGS. 7 and 14 , it should be understood that the sensing response device 220 or 230 performs channel estimation and generates CSI data after receiving an indication for PDP data feedback from the sensing initiation device 210. This is merely an example and not a limitation. In some embodiments, the sensing response device 220 or 230 may autonomously perform channel estimation, generate CSI data, and generate PDP data accordingly. After receiving an indication for PDP data feedback from the sensing initiation device 210, a portion of the PDP data is fed back to the sensing initiation device 210. In some other embodiments, the sensing response device 220 or 230 may alternatively perform channel estimation, generate CSI data, and generate and feed back PDP data periodically or autonomously without being triggered by an indication from the sensing initiation device 210.

[0250] FIG. 15 is a flowchart of a method 1500 for performing feedback based on CSI at the sensing-initiating device 210 according to some embodiments of the disclosure.

[0251] 15, in block 1505, the sensing initiation device 210 sends an indication for PDP data feedback to the sensing response device 220 or 230 to trigger the sensing response device 220 or 230 to generate PDP data for feedback based on the CSI data. In block 1510, the sensing initiation device 210 receives a portion of the PDP data from the sensing response device 220 or 230 within the generated PDP data.

[0252] In some embodiments, the sensing initiation device 210 transmits an indication of PDP data feedback to the sensing response device 220 or 230 using at least one of a trigger frame, an NDPA frame, an announcement frame, or a PDP frame. In some embodiments, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed. In some embodiments, a trigger type field included in the common information field in the trigger frame indicates that PDP data feedback is to be performed. In some embodiments, a sounding dialog token field or a dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed. In some embodiments, an AID field included in the dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0253] In some embodiments, the PDP frame includes a MIMO control field. The MIMO control field includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback. In some embodiments, the sensing initiation device 210 receives a portion of the PDP data from the sensing response device 220 or 230 using the PDP report frame.

[0254] In some embodiments, the sensing initiation device 210 transmits at least one of an indication of the distance or an indication of the offset of interest to the sensing response device 220 or 230. For example, the sensing initiation device 210 may use at least one of a trigger frame, an NDPA frame, an announcement frame, or a PDP frame to transmit at least one of an indication of the distance or an indication of the offset of interest to the sensing response device 220 or 230. In some embodiments, a trigger-dependent information field included in a common information field in the trigger frame indicates at least one of the distance or the offset of interest.

[0255] It should be understood that the operations and features described above with reference to Figures 2-14 are also applicable to, and have the same effect on, method 1500. Details will not be described again.

[0256]

[0013] Embodiments of the present disclosure further provide corresponding apparatuses for implementing the above methods or processes. Figure 16 is a schematic block diagram of the structure of an apparatus 1600 for performing feedback based on CSI in a sensing response device 220 or 230, according to some embodiments of the present disclosure.

[0257] As shown in FIG. 16, the apparatus 1600 includes a first channel estimation module 1605 configured to obtain CSI data based on the channel estimation, a second channel estimation module 1610 configured to generate PDP data based on the CSI data, and a feedback module 1615 configured to feed back a portion of the PDP data within the generated PDP data.

[0258] In some embodiments, the apparatus 1600 further includes a first receiving module 1620 configured to receive, utilizing the sensing response device, an indication for PDP data feedback from the sensing initiation device before the CSI data is obtained based on the channel estimation. In some embodiments, the second channel estimation module 1610 is configured to generate PDP data based on the CSI data in response to receiving, utilizing the sensing response device, the indication for PDP data feedback.

[0259] In some embodiments, the first receiving module 1620 utilizes a sensing response device and is configured to receive an indication of PDP data feedback from a sensing initiation device utilizing at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating PDP data feedback. In some embodiments, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed. In some embodiments, a trigger type field included in the common information field in the trigger frame indicates that PDP data feedback is to be performed. In some embodiments, a sounding dialog token field or a dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed. In some embodiments, an AID field included in the dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0260] In some embodiments, the PDP frame includes a multiple-input multiple-output MIMO control field. The MIMO control field includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback. In some embodiments, the feedback module 1615 is configured to utilize a sensing-responsive device to select a portion of the PDP data to be fed back from the generated PDP data based on the indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0261] In some embodiments, the feedback module 1615 is configured to utilize the sensing response device to feed back a portion of the PDP data within the generated PDP data to the sensing initiation device using a PDP report frame.

[0262] In some embodiments, the feedback module 1615 is configured to utilize the sensing response device to feed back a portion of the PDP data based on the propagation distance of the sensing signal.

[0263] In some embodiments, the apparatus 1600 further includes a second receiving module configured to receive, using the sensing response device, an indication from the sensing initiating device about the distance of interest. The feedback module 1615 is configured to, using the sensing response device, feed back a portion of the PDP data based on at least the distance of interest.

[0264] In some embodiments, the second receiving module is configured to utilize the sensing response device to receive an indication of the offset from the sensing initiating device. The feedback module 1615 is configured to utilize the sensing response device to feed back a portion of the PDP data based on the distance and offset of interest.

[0265] In some embodiments, the second receiving module is configured to utilize the sensing response device to receive at least one of an indication of the distance or the offset of interest from the sensing initiation device utilizing at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame indicating PDP data feedback. In some embodiments, a trigger dependent information field included in a common information field in the trigger frame indicates at least one of the distance or the offset of interest.

[0266] It should be understood that the operations and features of sensing response device 220 or 230 described above with reference to Figures 2-14 are also applicable to apparatus 1600 with the same effect, and will not be described again in detail.

[0267] FIG. 17 is a schematic block diagram of the structure of an apparatus 1700 for performing feedback based on CSI at the sensing-initiating device 210, according to some embodiments of the disclosure.

[0268] As shown in FIG. 17, the apparatus 1700 includes a first transmitting module 1705 configured to utilize a sensing initiation device to send an indication regarding power delay profile PDP data feedback to a sensing response device to trigger the sensing response device to generate PDP data for feedback to the sensing initiation device based on channel state information CSI data, and a third receiving module 1710 configured to utilize the sensing initiation device to receive a portion of the PDP data from the sensing response device within the generated PDP data.

[0269] In some embodiments, the first transmission module is configured to utilize the sensing initiation device to transmit an indication about PDP data feedback to the sensing response device using at least one of a trigger frame, a null data packet announcement NDPA frame, an announcement frame, or a PDP frame for indicating PDP data feedback. In some embodiments, a common information field or a dedicated information field in the trigger frame indicates that PDP data feedback is to be performed. In some embodiments, a trigger type field included in the common information field in the trigger frame indicates that PDP data feedback is to be performed. In some embodiments, a sounding dialog token field or a dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed. In some embodiments, an AID field included in the dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed.

[0270] In some embodiments, the PDP frame includes a multiple-input multiple-output MIMO control field, which includes an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

[0271] In some embodiments, the third receiving module is configured to utilize the sensing initiating device to receive a portion of the PDP data from the sensing responding device utilizing a PDP reporting frame.

[0272] In some embodiments, apparatus 1700 further includes a second transmitting module configured to utilize the sensing-initiating device to transmit at least one of an indication of the distance of interest or an indication of the offset to the sensing response device. In some embodiments, the second transmitting module is configured to utilize the sensing-initiating device to transmit at least one of an indication of the distance of interest or an indication of the offset to the sensing response device using at least one of a trigger frame, a null data packet announcement (NDPA) frame, an announcement frame, or a PDP frame for PDP data feedback. In some embodiments, a trigger-dependent information field included in a common information field in the trigger frame indicates at least one of the distance of interest or the offset.

[0273] It should be understood that the operations and features of the sensing-initiation device 210 described above with reference to Figures 2 to 14 are also applicable to the apparatus 1700 with the same effect, and will not be described again in detail.

[0274] The modules included in devices 1600 and 1700 may be implemented using software, hardware, firmware, or any combination thereof. In some embodiments, one or more modules may be implemented using software and / or firmware, e.g., machine-executable instructions stored on a storage medium. In addition to or in the alternative to machine-executable instructions, some or all of the modules in devices 1600 and 1700 may be implemented, at least in part, using one or more hardware logic components. By way of example and not limitation, exemplary hardware logic components that may be used include field programmable logic arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0275] 18 is a block diagram of a device 1800 in which some embodiments of the present disclosure may be implemented. The device 1800 may be configured to implement the sensing initiation device 210 or the sensing response device 220 or 230 shown in FIG.

[0276] As shown in Figure 18, device 1800 includes a processor 1810, which controls the operation and functionality of device 1800. For example, in some demonstrative embodiments, processor 1810 may perform various operations using instructions 1830 stored in memory 1820 coupled to processor 1810. Memory 1820 may be of any suitable type applicable to the local technology environment and may be implemented using any suitable data storage technology, including, but not limited to, semiconductor-based storage devices, magnetic storage devices and systems, and optical storage devices and systems. Although only one memory unit is shown in Figure 18, multiple physically distinct memory units may exist within device 1800.

[0277] The processor 1810 may be of any suitable type applicable to the local technology environment, including, but not limited to, one or more of a general-purpose computer, a special-purpose computer, a microcontroller, a digital signal processor (DSP), and a controller-based multi-core controller architecture. The device 1800 may further include multiple processors 1810. The processor 1810 is coupled to a communication unit 1840. The communication unit 1840 may receive and transmit information using wireless signals or via optical fibers, cables, and / or other components.

[0278] When device 1800 operates as sensing response device 220 or 230, processor 1810 may execute instructions to perform the operations and actions of sensing response device 220 or 230 described above with reference to Figures 2-17. When device 1800 operates as sensing initiation device 210, processor 1810 may execute instructions to perform the operations and actions of sensing initiation device 210 described above with reference to Figures 2-17. All features described above with reference to Figures 2-17 are applicable to device 1800 and will not be described again in detail here.

[0279] In general, various exemplary embodiments of this disclosure may be implemented in hardware or special-purpose circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, microprocessor, or other computing device. When aspects of exemplary embodiments of this disclosure are shown or described as block diagrams, flowcharts, or represented with the aid of some other diagrams, it will be understood that the blocks, apparatus, systems, techniques, or methods described herein may be implemented, as non-limiting examples, in hardware, software, firmware, special-purpose circuits or logic, general-purpose hardware or controllers, or other computing devices, or some combination thereof.

[0280] For example, exemplary embodiments of this disclosure may be described in the context of machine-executable or computer-executable instructions. Machine-executable instructions are program modules that execute on a device, such as a target real or virtual processor. Typically, program modules include routines, programs, libraries, objects, classes, components, and data structures that perform particular tasks or implement particular abstract data structures. In various exemplary embodiments, the functionality of the program modules may be combined or divided among the described program modules. Machine-executable instructions for program modules may be executed locally or within distributed devices. In distributed devices, program modules may be located in both local and remote storage media.

[0281] The computer program code used to implement the methods disclosed in this disclosure may be written in one or more programming languages. The computer program code may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that when the program code is executed by the computer or other programmable data processing apparatus, the functions / acts identified in the flowcharts and / or block diagrams are implemented. The program code may be executed entirely on a computer, partially on a computer, partially on a computer and partially on a remote computer, or entirely on a remote computer or server, as a separate software package.

[0282] In the context of this disclosure, a machine-readable medium or computer-readable medium may be any tangible medium that contains or stores a program or has a program associated with an instruction execution system, apparatus, or device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More specific examples of a machine-readable storage medium include an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0283] Additionally, while operations are described in a particular order, this should not be construed as requiring such operations to be completed in the particular order shown, or in any sequential order, or as requiring the execution of all of the illustrated operations to achieve desired results. In some cases, multitasking or parallel processing may be advantageous. Similarly, while the above description includes some specific implementation details, this should not be construed as limiting the scope of any invention or the claims, but rather as a description of particular exemplary embodiments that may be specific to particular inventions. Some features described in this specification in the context of separate exemplary embodiments may alternatively be combined in a single exemplary embodiment. Conversely, various features that are described in the context of a single exemplary embodiment may alternatively be implemented separately in multiple exemplary embodiments or in any suitable subcombination.

[0284] Although elements have been described in terms specific to structural features and / or methodological actions, it should be understood that the elements defined in the appended claims are not limited to the specific features or actions described above. Rather, the specific features and actions described above are disclosed as example forms of implementing the claims.

Claims

1. sending, by a sensing-initiating device, an indication of power delay profile PDP data feedback to a sensing-response device to trigger the sensing-response device to generate PDP data for feedback based on CSI data; receiving, by the sensing initiation device, a portion of PDP data within the generated PDP data from the sensing response device; A communication method, including:

2. Sending an indication about the PDP data feedback comprises: transmitting, by the sensing initiation device, the indication of PDP data feedback to the sensing response device using at least one of a trigger frame, a null data packet announcement (NDPA) frame, an announcement frame, or a PDP frame for indicating PDP data feedback; The method of claim 1.

3. a common information field or a dedicated information field in the trigger frame indicating that PDP data feedback is to be performed; The method of claim 2.

4. a trigger type field included in the common information field in the trigger frame indicates that PDP data feedback is to be performed; The method of claim 3.

5. a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed; The method of claim 2.

6. an association identifier AID field included in the dedicated information field in the NDPA frame indicates that PDP data feedback is performed; The method of claim 5.

7. the PDP frame includes a multiple-input multiple-output MIMO control field, the MIMO control field including an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of matrix elements of a PDP matrix for feedback; The method of claim 2.

8. The step of receiving a portion of PDP data comprises: receiving, by the sensing initiation device, a portion of the PDP data from the sensing response device using a PDP report frame; The method of claim 1.

9. transmitting, by the sensing initiation device, at least one of an indication of a distance of interest or an indication of an offset to the sensing response device. The method of claim 1.

10. the sensing initiation device transmits the at least one of the indication of the distance of interest or the indication of the offset to the sensing response device using at least one of a trigger frame, a null data packet announcement (NDPA) frame, an announcement frame, or a PDP frame for indicating PDP data feedback; 10. The method of claim 9.

11. a trigger dependent information field included in a common information field in the trigger frame indicating at least one of the distance of interest or the offset; The method of claim 10.

12. obtaining, by a sensing-response device, CSI data based on the channel estimation; generating, by the sensing-responsive device, power delay profile PDP data based on the CSI data; feeding back, by the sensing response device, a portion of PDP data within the generated PDP data; A communication method, including:

13. and receiving, by the sensing response device, an indication of PDP data feedback from the sensing initiation device before the CSI data is obtained based on channel estimation. The method of claim 12.

14. The step of generating PDP data comprises: generating, by the sensing response device, the PDP data based on the CSI data in response to the reception of the indication for PDP data feedback. The method of claim 13.

15. The step of receiving an indication of PDP data feedback comprises: receiving, by the sensing response device, the indication of PDP data feedback from the sensing initiation device using at least one of a trigger frame, a null data packet announcement (NDPA) frame, an announcement frame, or a PDP frame indicating PDP data feedback; The method of claim 13.

16. a common information field or a dedicated information field in the trigger frame indicating that PDP data feedback is to be performed; 16. The method of claim 15.

17. a trigger type field included in the common information field in the trigger frame indicates that PDP data feedback is to be performed; 17. The method of claim 16.

18. a sounding dialog token field or dedicated information field in the NDPA frame indicates that PDP data feedback is to be performed; 16. The method of claim 15.

19. an association identifier AID field included in the dedicated information field in the NDPA frame indicates that PDP data feedback is performed; 20. The method of claim 18.

20. the PDP frame includes a multiple-input multiple-output MIMO control field, the MIMO control field including an indication of at least one of the number of columns, the number of rows, or the number of quantization bits of matrix elements of a PDP matrix for feedback; 16. The method of claim 15.

21. said step of feeding back a portion of PDP data comprises: selecting, by the sensing response device, a portion of the PDP data to be fed back from the generated PDP data based on the indication of at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the PDP matrix for feedback.

21. The method of claim 20.

22. said step of feeding back a portion of PDP data comprises: and feeding back, by the sensing response device, a portion of the PDP data of the generated PDP data using a PDP report frame. The method of claim 12.

23. said step of feeding back a portion of PDP data comprises: feeding back, by the sensing response device, a portion of the PDP data based on a propagation distance of a sensing signal; The method of claim 12.

24. said step of feeding back a portion of PDP data comprises: receiving, by the sensing response device, an indication from the sensing initiation device of a distance of interest of the sensing signal; feeding back, by the sensing response device, a portion of the PDP data based on at least the distance of interest; Including, 24. The method of claim 23.

25. said step of feeding back a portion of said PDP data based on at least said distance of interest comprises: receiving, by the sensing response device, an indication of an offset from the sensing initiation device; feeding back, by the sensing response device, a portion of the PDP data based on the distance of interest and the offset; Including, 25. The method of claim 24.

26. the sensing response device receives at least one of the indication of the distance of interest or the indication of the offset from the sensing initiation device using at least one of a trigger frame, a null data packet announcement (NDPA) frame, an announcement frame, or a PDP frame indicating PDP data feedback; 26. The method of claim 25.

27. a trigger dependent information field included in a common information field in the trigger frame indicating at least one of the distance of interest or the offset; 27. The method of claim 26.

28. said step of feeding back a portion of PDP data comprises: feeding back, by the sensing response device, a portion of the PDP data among the generated PDP data to the sensing initiation device; The method of claim 12.

29. 1. A communications device including a processor, the processor coupled to a memory, the memory storing instructions; When the instructions are executed by the processor, the method of any one of claims 1 to 11 or claims 12 to 28 is performed. Communication devices.

30. A computer-readable storage medium storing a program, the program being at least partly executed by a processor in a device, which enables the device to perform the method of any one of claims 1 to 11 or claims 12 to 28.

31. 29. A computer program product comprising computer-executable instructions that, when executed, perform a method according to any one of claims 1 to 11 or 12 to 28.

32. A chip comprising processing circuitry configured to carry out the method of any one of claims 1 to 11 or claims 12 to 28.

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