Sensory result feedback method, apparatus, device, and medium

Abstract

A method, apparatus, device, and medium for providing feedback of sensing results are provided. [Solution] In an exemplary method, a sensing starter device sends an indication to a first sensing response device regarding the terminating and feedback of the time-domain channel estimation and sensing sequence. Based on the indication, the first sensing response device terminates the received time-domain channel estimation and sensing sequence and feeds back the terminated time-domain channel estimation and sensing sequence. Thus, the sensing sender can perform channel estimation and target sensing based on the terminated time-domain channel estimation and sensing sequence. In this way, feedback overhead can be significantly reduced and sensing performance can be guaranteed to a certain extent.

Description

[Technical Field]

[0001] This disclosure relates to the field of wireless local area networks, and more particularly to methods, apparatus, devices, and media for feedback of sensing results in wireless local area network (WLAN) sensing. [Background technology]

[0002] Examples of WLAN detection are attracting attention through WLAN signals. do The goal is to sense a target in a direction. Unlike 802.11az, the target sensed in WLAN sensing does not need to be carried by any device. Technologies related to WLAN sensing can be widely used in scenarios such as intrusion detection, action identification, and respiration / heartbeat detection. One implementation of WLAN sensing is to perform sensing based on channel state information (CSI). CSI is the channel state between the sending device and the receiving device. Show , including comprehensive detailed information. Therefore, CSI can be performed to sense the target of interest in the environment. [Overview of the Initiative]

[0003] This disclosure provides a solution for feedback of detection results in WLAN detection.

[0004] A first aspect of the present disclosure provides a communication method in which a sensing starter device sends a first indication to a first sensing responder device indicating that the first sensing responder device is to be used as a sensing receiver. The sensing starter device sends a second indication to the first sensing responder device, the second indication indicating to the first sensing responder device that it should feed back the truncated time-domain channel estimate and sensing sequence.

[0005] In some implementations, the sensing-start device receives a truncated time-domain channel estimate and sensing sequence from a first sensing-response device. The sensing-start device performs channel estimation and target sensing based on the truncated time-domain channel estimate and sensing sequence.

[0006] In some implementations, the truncated time-domain channel estimate and sensing sequence fed back by the first sensing-response device is part of the time-domain long training field (LTF) sequence received by the first sensing-response device. The sensing-start device receives the truncated time-domain channel estimate and sensing sequence from the first sensing-response device by using the truncated long training field (T-LTF) frame.

[0007] In some implementations, the truncated time-domain channel estimate and sensing sequence, which are fed back by the first sensing response device, are represented by a T-LTF matrix. The T-LTF frame includes a multiple-input multiple-output (MIMO) control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0008] In some implementations, the truncated time-domain channel estimate and sensing sequence fed back by the first sensing-response device is part of the time-domain channel estimate field (CEF) sequence received by the first sensing-response device. The sensing-start device receives the truncated time-domain channel estimate and sensing sequence from the first sensing-response device by using the sensing feedback element field.

[0009] In some implementations, the sensing start device sends a third indication to the second sensing response device indicating that the second sensing response device is to be used as the sensing transmitting side. The sensing start device sends a second indication to the second sensing response device. The second indication further indicates to the second sensing response device that channel estimation and target sensing should be performed based on the truncated time domain channel estimation and sensing sequence feedback by the first sensing response device.

[0010] In some implementations, the sensing start device sends a fourth indication to the first sensing response device regarding the truncation ratio of the time domain channel estimation and sensing sequence.

[0011] In some implementations, the sensing start device sends a second indication to the first sensing response device by using at least one of an announcement frame, a trigger frame, a null data packet announcement (NDPA) frame, or a beam refinement protocol (BRP) frame.

[0012] In some implementations, the common information field or the dedicated information field in the trigger frame indicates that truncation and feedback are to be performed on the time domain channel estimation and sensing sequence. In some implementations, the trigger type field included in the common information field in the trigger frame indicates that truncation and feedback are to be performed on the time domain channel estimation and sensing sequence.

[0013] In some implementations, the sounding dialog token field or the dedicated information field in the NDPA frame indicates that truncation and feedback are to be performed on the time domain channel estimation and sensing sequence. In some implementations, the association identifier (AID) field included in the dedicated information field in the NDPA frame indicates that truncation and feedback are to be performed on the time domain channel estimation and sensing sequence.

[0014] In some implementations, the BRP request field or directional multi-gigabit (DMG) beam tuning element field in the BRP frame is used to perform censoring and feedback on the time-domain channel estimation and sensing sequence.

[0015] A second aspect of the present disclosure provides a communication method in which a first sensing response device receives a first indication from a sensing starter device indicating that the first sensing response device is to be used as a sensing receiver. The first sensing response device receives a second indication from the sensing starter device, which indicates to the first sensing response device that it should feed back a truncated time-domain channel estimate and sensing sequence. The first sensing response device truncates the received time-domain channel estimate and sensing sequence. The first sensing response device feeds back the truncated time-domain channel estimate and sensing sequence.

[0016] In some implementations, the first sensing-response device receives a fourth indication from the sensing-start device regarding the censoring ratio of the time-domain channel estimate and sensing sequence. The first sensing-response device censors the time-domain channel estimate and sensing sequence based on the censoring ratio.

[0017] In some implementations, time-domain channel estimation and sensing sequences include the cyclic prefix CP. Censored time-domain channel estimation and sensing sequences exclude the CP.

[0018] In some implementations, the first sensing response device sends the truncated time-domain channel estimate and sensing sequence to the sensing start device.

[0019] In some implementations, the time-domain channel estimate and sensing sequence are received by a first sensing response device from a second sensing response device. The first sensing response device sends the truncated time-domain channel estimate and sensing sequence to the second sensing response device.

[0020] In some implementations, the first sensing response device receives a second indication from the sensing starter device by using at least one of the following: an alert frame, a trigger frame, an NDPA frame, or a BRP frame.

[0021] In some implementations, a common or dedicated information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences. In some implementations, a trigger type field included in the common information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences.

[0022] In some implementations, the Sounding Dialogue Token field or Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence. In some implementations, the AID field included in the Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence.

[0023] In some implementations, the truncated time-domain channel estimate and sensing sequence are part of the time-domain LTF sequence received by the first sensing response device. The first sensing response device feeds back the truncated time-domain channel estimate and sensing sequence by using the T-LTF frame.

[0024] In some implementations, the truncated time-domain channel estimation and sensing sequences are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0025] In some implementations, the BRP request field or DMG beam adjustment element field in the BRP frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

[0026] In some implementations, the truncated time-domain channel estimate and sensing sequence are part of the time-domain CEF sequence received by the first sensing response device. The first sensing response device feeds back the truncated time-domain channel estimate and sensing sequence by using a sensing feedback element field.

[0027] A third aspect of this disclosure provides a communication method. In this method, a second sensing response device receives a third indication from a sensing starter device indicating that the second sensing response device will be used as a sensing sender. The second sensing response device receives a second indication from the sensing starter device, which indicates to the second sensing response device that channel estimation and target sensing should be performed based on a truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device. The second sensing response device sends a time-domain channel estimation and sensing sequence to the first sensing response device. The second sensing response device receives a truncated time-domain channel estimation and sensing sequence from the first sensing response device. The second sensing response device performs channel estimation based on the truncated time-domain channel estimation and sensing sequence.

[0028] In some implementations, the second sensing response device receives the second indication from the sensing starter device by using at least one of the following: an alert frame, a trigger frame, an NDPA frame, or a BRP frame.

[0029] In some implementations, a common or dedicated information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences. In some implementations, a trigger type field included in the common information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences.

[0030] In some implementations, the Sounding Dialogue Token field or Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence. In some implementations, the AID field included in the Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence.

[0031] In some implementations, the time-domain channel estimate and sensing sequence sent by the second sensing response device includes a time-domain LTF sequence. The second sensing response device receives the truncated time-domain channel estimate and sensing sequence from the first sensing response device by using the T-LTF frame.

[0032] In some implementations, the truncated time-domain channel estimate and sensing sequence received by a second sensing response device are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0033] In some implementations, the BRP request field or DMG beam adjustment element field in the BRP frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

[0034] In some implementations, the time-domain channel estimate and sensing sequence sent by the second sensing response device includes a time-domain CEF sequence. The second sensing response device receives the truncated time-domain channel estimate and sensing sequence from the first sensing response device by using the sensing feedback element field.

[0035] A fourth aspect of the present disclosure provides a communication device comprising: a first transmitting module configured to send a first indication to a first sensing response device using a sensing start device, indicating that the first sensing response device is to be used as a sensing receiver; and a second transmitting module configured to send a second indication to the first sensing response device using a sensing start device, the second indication indicating to the first sensing response device that a truncated time-domain channel estimate and sensing sequence should be fed back.

[0036] In some implementations, the device further includes a first receiving module configured to receive a truncated time-domain channel estimate and sensing sequence from a first sensing response device using a sensing start device, and a first channel estimation module configured to perform channel estimation and target sensing using a sensing start device based on the truncated time-domain channel estimate and sensing sequence.

[0037] In some implementations, the truncated time-domain channel estimate and sensing sequence fed back by the first sensing-response device is part of the time-domain LTF sequence received by the first sensing-response device. The first receiving module is configured to receive the truncated time-domain channel estimate and sensing sequence from the first sensing-response device, by using a sensing-start device and by using T-LTF frames.

[0038] In some implementations, the truncated time-domain channel estimate and sensing sequence, which are fed back by the first sensing response device, are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0039] In some implementations, the truncated time-domain channel estimate and sensing sequence fed back by the first sensing-response device is part of the time-domain CEF sequence received by the first sensing-response device. The first receiving module is configured to receive the truncated time-domain channel estimate and sensing sequence from the first sensing-response device by using a sensing-start device and by using a sensing-feedback element field.

[0040] In some implementations, the device further includes a third transmitting module configured to send a third indication to a second sensing response device, by using a sensing start device, indicating that the second sensing response device is to be used as the sensing sender. The second transmitting module is further configured to send a second indication to the second sensing response device, which further indicates to the second sensing response device that channel estimation and target sensing should be performed based on a truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device.

[0041] In some implementations, the device further includes a fourth transmitting module configured to send a fourth indication regarding time-domain channel estimation and the truncation ratio of the sensing sequence to a first sensing response device by using a sensing start device.

[0042] In some implementations, the first transmitting module is configured to send a second indication to the first sensing response device by using a sensing start device, by using at least one of an announcement frame, a trigger frame, an NDPA frame, or a BRP frame.

[0043] In some implementations, a common or dedicated information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences. In some implementations, a trigger type field included in the common information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences.

[0044] In some implementations, the Sounding Dialogue Token field or Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequences. In some implementations, the Association Identifier (AID) field included in the Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequences.

[0045] In some implementations, the BRP request field or directional multi-gigabit (DMG) beam tuning element field in the BRP frame is used to perform censoring and feedback on the time-domain channel estimation and sensing sequence.

[0046] A fifth aspect of the present disclosure provides a communication device. The device includes: a second receiving module configured to receive a first indication from a sensing starter device, by using a first sensing response device, that the first sensing response device is to be used as a sensing receiver; a third receiving module configured to receive a second indication from the sensing starter device, by using the first sensing response device, the second indication indicating to the first sensing response device that the truncated time-domain channel estimate and sensing sequence should be fed back; a truncation module configured to truncate the received time-domain channel estimate and sensing sequence, by using the first sensing response device; and a feedback module configured to feed back the truncated time-domain channel estimate and sensing sequence, by using the first sensing response device.

[0047] In some implementations, the device further includes a fourth receiving module configured to receive a fourth indication from the sensing starter device regarding the censoring ratio of the time-domain channel estimate and sensing sequence by using a first sensing response device. The censoring module is configured to censor the time-domain channel estimate and sensing sequence based on the censoring ratio by using the first sensing response device.

[0048] In some implementations, time-domain channel estimation and sensing sequences include the cyclic prefix CP. Censored time-domain channel estimation and sensing sequences exclude the CP.

[0049] In some implementations, the feedback module is configured to send a truncated time-domain channel estimate and sensing sequence to the sensing start device by using a first sensing response device.

[0050] In some implementations, the time-domain channel estimate and sensing sequence are received from a second sensing-response device by a first sensing-response device. The feedback module is configured to send the truncated time-domain channel estimate and sensing sequence to the second sensing-response device using the first sensing-response device.

[0051] In some implementations, a third receiving module is configured to receive a second indication from a sensing starter device by using a first sensing response device, by using at least one of an announcement frame, a trigger frame, an NDPA frame, or a BRP frame.

[0052] In some implementations, a common or dedicated information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences. In some implementations, a trigger type field included in the common information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences.

[0053] In some implementations, the Sounding Dialogue Token field or Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence. In some implementations, the AID field included in the Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence.

[0054] In some implementations, the truncated time-domain channel estimate and sensing sequence are part of the time-domain LTF sequence received by the first sensing response device. The feedback module is configured to feed back the truncated time-domain channel estimate and sensing sequence using the T-LTF frame by using the first sensing response device.

[0055] In some implementations, the truncated time-domain channel estimate and sensing sequence, which are fed back by the first sensing response device, are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0056] In some implementations, the BRP request field or DMG beam adjustment element field in the BRP frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

[0057] In some implementations, the truncated time-domain channel estimate and sensing sequence are part of the time-domain CEF sequence received by the first sensing response device. The feedback module is configured to feed back the truncated time-domain channel estimate and sensing sequence by using the first sensing response device and by using the sensing feedback element field.

[0058] According to a sixth aspect of this disclosure, a communication device is provided. The device includes: a fifth receiving module configured to receive a third indication from a sensing starter device, by using a second sensing response device, indicating that the second sensing response device is to be used as the sensing sender; a sixth receiving module configured to receive a second indication from the sensing starter device, by using a second sensing response device, wherein the second indication indicates to the second sensing response device that channel estimation and target sensing should be performed based on a truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device; a fifth transmitting module configured to send a time-domain channel estimation and sensing sequence to the first sensing response device, by using a second sensing response device; a seventh receiving module configured to receive a truncated time-domain channel estimation and sensing sequence from the first sensing response device, by using a second sensing response device; and a second channel estimation module configured to perform channel estimation and target sensing based on a truncated time-domain channel estimation and sensing sequence, by using a second sensing response device.

[0059] In some implementations, the sixth receiving module is configured to receive a second indication from the sensing starter device by using a second sensing response device, by using at least one of an announcement frame, a trigger frame, an NDPA frame, or a BRP frame.

[0060] In some implementations, a common or dedicated information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences. In some implementations, a trigger type field included in the common information field in the trigger frame indicates that censoring and feedback should be applied to the time-domain channel estimation and sensing sequences.

[0061] In some implementations, the Sounding Dialogue Token field or Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence. In some implementations, the AID field included in the Dedicated Information field in the NDPA frame indicates that censoring and feedback will be performed on the time-domain channel estimation and sensing sequence.

[0062] In some implementations, the time-domain channel estimation and sensing sequence sent by the second sensing response device includes a time-domain LTF sequence. The seventh receiving module is configured to receive the truncated time-domain channel estimation and sensing sequence from the first sensing response device, by using the second sensing response device and by using the T-LTF frame.

[0063] In some implementations, the truncated time-domain channel estimate and sensing sequence received by a second sensing response device are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0064] In some implementations, the BRP request field or DMG beam adjustment element field in the BRP frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

[0065] In some implementations, the time-domain channel estimate and sensing sequence sent by the second sensing response device includes a time-domain CEF sequence. The seventh receiving module is configured to receive the truncated time-domain channel estimate and sensing sequence from the first sensing response device by using the second sensing response device and by using the sensing feedback element field.

[0066] According to a seventh aspect of this disclosure, a communication device is provided. This device includes a processor, which is coupled to a memory storing instructions. When an instruction is executed by the processor, a method according to a first, second, or third aspect of this disclosure is performed.

[0067] According to the eighth aspect of this disclosure, a computer-readable storage medium is provided, and a program is stored in the computer-readable storage medium. When at least a portion of the program is executed by a processor in the device, the device implements a method according to the first, second, or third aspect of this disclosure.

[0068] According to the ninth aspect of this disclosure, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the method according to the first, second, or third aspect of this disclosure is carried out.

[0069] Please understand that the content described in the summary section does not limit the main or important features of this disclosure, nor does it limit the scope of this disclosure. The following explanations will facilitate understanding of other features of this disclosure. [Brief explanation of the drawing]

[0070] The above and other features, advantages, and aspects of embodiments of this disclosure will become more apparent with reference to the accompanying drawings and the following detailed description. In the accompanying drawings, the same or similar reference numerals indicate the same or similar elements.

[0071] [Figure 1a] This figure shows an exemplary scenario of CSI feedback in WLAN detection. [Figure 1b] This figure shows an exemplary scenario of CSI feedback in WLAN detection. [Figure 2] This figure shows an exemplary environment in which embodiments of the present disclosure may be implemented. [Figure 3] This figure shows the sensing result feedback processing according to some embodiments of the present disclosure. [Figure 4] This figure shows termination and feedback processing according to some embodiments of the present disclosure. [Figure 5a] This figure shows the channel estimation performance based on the truncated time-domain LTF sequence, obtained when the truncation ratio is 1 / 4 in the feedback process shown in Figure 4. [Figure 5b] This figure shows the channel estimation performance based on the truncated time-domain LTF sequence, obtained when the truncation ratio is 3 / 8 in the feedback process shown in Figure 4. [Figure 5c] This figure shows the channel estimation performance based on the truncated time-domain LTF sequence, obtained when the truncation ratio is 4 / 8 in the feedback process shown in Figure 4. [Figure 6] This is a flowchart of a sensing result feedback method implemented in a sensing start device according to some embodiments of the present disclosure. [Figure 7] This figure shows an exemplary sensing process according to some embodiments of the present disclosure. [Figure 8a] This figure shows an exemplary frame format for a trigger frame according to some embodiments of the present disclosure. [Figure 8b] This figure shows an exemplary frame format of a common information field in a trigger frame according to some embodiments of the present disclosure. [Figure 8c]This figure shows an exemplary frame structure of the trigger-based common information field in the common information field of the trigger frame according to some embodiments of the present disclosure. [Figure 9a] This figure shows an exemplary frame format of a Null Data Packet Notification (NDPA) frame according to some embodiments of the present disclosure. [Figure 9b] This figure shows an exemplary frame format of the station information 1 field of an NDPA frame according to some embodiments of the present disclosure. [Figure 10] This figure shows an exemplary high-frequency beam training process according to some embodiments of the present disclosure. [Figure 11] This figure shows an exemplary structure of a beam refining protocol (BRP) requirement field according to some embodiments of the present disclosure. [Figure 12] This figure shows an exemplary structure of a directional multi-gigabit (DMG) beam refining element field according to some embodiments of the present disclosure. [Figure 13] This is a flowchart of a time-domain channel estimation and sensing sequence termination and feedback method in a first sensing response device according to some embodiments of the present disclosure. [Figure 14] This figure shows an exemplary frame structure of a HE multiple-input multiple-output (MIMO) control field according to some embodiments of the present disclosure. [Figure 15] This diagram shows the frame structure of a conventional EHT MIMO control field. [Figure 16] This figure shows an exemplary frame structure of an EHT MIMO control field according to some embodiments of the present disclosure. [Figure 17] This is a flowchart of a channel estimation method implemented in a second sensing response device as a sensing sender according to some embodiments of the present disclosure. [Figure 18a] This figure shows channel estimation results based on time-domain LTF sequences with a 4 / 8 censoring ratio according to some embodiments of the present disclosure. [Figure 18b] This figure shows channel estimation results based on time-domain LTF sequences with a 4 / 8 censoring ratio according to some embodiments of the present disclosure. [Figure 19] This is a schematic block diagram of the structure of a device implemented in a sensing start device according to some embodiments of the present disclosure. [Figure 20] This is a schematic block diagram of the structure of a device implemented in a first sensing response device according to some embodiments of the present disclosure. [Figure 21] This is a schematic block diagram of the structure of a device implemented in a second sensing response device according to some embodiments of the present disclosure. [Figure 22] This is a block diagram of a device in which several embodiments of the present disclosure may be implemented. [Modes for carrying out the invention]

[0072] Embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the accompanying drawings, it should be understood that this disclosure may 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 as to enable a thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and do not limit the scope of protection of this disclosure.

[0073] As used herein, the term “including” and its variations are open to including, and specifically, “including, but not limited to.” The term “based on” means “at least partially based on.” The term “embodiment” means “at least one embodiment,” and the term “another embodiment” means “at least one other embodiment.” Other terms are defined in the following description.

[0074] In this specification, the terms “first” and “second” may be used to describe various components, but it should be understood that these components should not be limited by these terms. These terms are used solely to distinguish one element from another. The term “and / or” as used herein includes all combinations of one or more of the listed terms.

[0075] As described above, the implementation of WLAN sensing involves performing sensing by using CSI. Figures 1a and 1b show two exemplary scenarios 100 and 105 of CSI feedback in WLAN sensing.

[0076] In scenario 100 shown in Figure 1a, station (STA) 110 acts as a sensing initiator to start a sensing procedure and as a receiving end to receive sensing signals in the sensing procedure. STA115 and STA120 act as sensing responders to respond to and participate in the sensing procedure started by the sensing initiator and as transmitting ends to send sensing signals in the sensing procedure. As shown in Figure 1a, STA110 sends a trigger frame to STA115 and STA120 (125, 130), and STA115 and STA120 send sensing physical layer protocol data units (PPDUs) to STA110 (135, 140). STA110 receives the sensed PPDUs, measures the environment / channel, and obtains the CSI.

[0077] In scenario 105 shown in Figure 1b, STA110 acts as the sensing initiator and transmitting end, while STA115 and STA120 act as the sensing responders and receiving ends. As shown in Figure 1b, STA110 sends the sensing PPDU to STA115 and STA120 (145, 150), and STA115 and STA120 receive the sensing PPDU, measure the environment / channel, and feed back the CSI obtained through the measurement to STA110 (155, 160). This is explicit feedback of the CSI.

[0078] Currently, the 802.11 standard includes two traditional CSI explicit feedback schemes: CSI matrix feedback and compressed CSI feedback. A CSI matrix is ​​typically a complete CSI matrix containing all channel state information acquired throughout the measurement. Operation based on the CSI matrix can implement target sensing. However, due to its high overhead, the CSI matrix is ​​only used in 802.11n and is no longer used after 802.11ac.

[0079] Compressed CSI is a CSI feedback mode introduced after 802.11ac. In this scheme, singular value decomposition (SVD) is first performed on the CSI matrix, and rotation angle decomposition (e.g., Givens rotation decomposition) is performed on the acquired right-hand singular matrix V, with the acquired angle being fed back. For example, the angle value acquired through decomposition can be quantized based on a specified number of bits and then transmitted. Compressed CSI can be used to support multi-input multi-output (MIMO) precoding and can well support communication data transmission. However, some information is lost in the angle calculation process described above, and therefore, WLAN sensing cannot be better supported.

[0080] Another CSI feedback scheme is one based on a power delay profile (PDP). In this scheme, an inverse fast Fourier transform (IFFT) is performed on the frequency-domain CSI on a single antenna obtained through channel estimation, and a time-domain PDP can be obtained. The PDP describes the relationship between energy and delay or distance along the path of the sensed signal propagation. show This can occur and is also called an energy delay image. During feedback, PDP data within the range of interest is selected for transmission, which can reduce feedback overhead. To account for non-ideal synchronization, etc., it may be necessary to feed back information about some further distance units to the distance units within the range of interest. PDP-based feedback requires an additional step of IFFT processing for the frequency-domain CSI after channel estimation is complete and the frequency-domain CSI is acquired. Therefore, modifications to the physical layer (PHY) are necessary. Needed ru.

[0081] Embodiments of this disclosure provide a novel sensing result feedback mechanism for WLAN sensing. According to this mechanism, in a sensing process initiated by a sensing initiator, the sensing initiator first assigns a sensing role to a sensing responder. In particular, the sensing initiator sends an indication (referred to as the "first indication") to the sensing responder (referred to as the "first sensing responder") indicating that the sensing initiator is servicing as a sensing receiver. The sensing initiator then further sends to the first sensing responder an indication (referred to as the "second indication") regarding the truncation and feedback of a time-domain sensing signal. After the first sensing responder receives the second indication, the first sensing responder truncates the received time-domain sensing signal and feeds back the truncated time-domain sensing signal. In some embodiments, the first sensing responder may send the truncated time-domain sensing signal to the sensing initiator, thereby enabling the sensing initiator to perform channel estimation based on the truncated time-domain sensing signal. In this case, the sensing initiator can act as the sensing sender.

[0082] In some other embodiments, another sensing response device (referred to as the “second sensing response device”) may act as the sensing sender. In this case, when assigning the sensing role, the sensing starter device sends an indication (referred to as the “third indication”) to the second sensing response device indicating that the sensing starter device should be the sensing sender. In addition, the sensing starter device further sends a second indication to the second sensing response device regarding the truncation and feedback of the time-domain sensing signal. In this way, after the second sensing response device has sent the time-domain sensing signal to the first sensing response device, the first sensing response device truncates the time-domain sensing signal received from the second sensing response device and feeds the time-domain sensing signal back to the second sensing response device. The second sensing response device then performs channel estimation based on the truncated time-domain sensing signal.

[0083] In this way, after receiving a time-domain sensing signal (e.g., a time-domain channel estimation field), the sensing receiver can perform truncation (or fitting) feedback, for example, by selecting only a portion of the received field for feedback. The sensing sender can then perform channel estimation after receiving the fitted time-domain channel estimation field to obtain sensing parameters. In this way, the overhead for feeding back the CSI can be significantly reduced, and sensing performance can be guaranteed to a certain extent.

[0084] Figure 2 shows an exemplary environment 200 in which embodiments of the present disclosure may be implemented.

[0085] As shown in Figure 2, environment 200 is part of a WLAN and includes a sensing starter device 210, a first sensing response device 220, and a second sensing response device 230. In this example, the sensing starter device 210, the first sensing response device 220, and the second sensing response device 230 are all STAs. It should be understood that this is merely an example and not an limitation. Depending on the specific implementation and scenario, the sensing starter device 210, the first sensing response device 220, and the second sensing response device 230 may be either an STA or an access point (AP). The sensing starter device 210, the first sensing response device 220, and the second sensing response device 230 may be implemented by any suitable device, including APs and STAs, such as a communications server, router, switch, bridge, computer, or mobile phone, but are not limited to these.

[0086] Furthermore, please understand that environment 200 shows one sensing start device and two sensing response devices for illustrative purposes only. Hereafter, a scenario with multiple sensing response devices and one sensing start device (shown in Figure 2) will be used as an example to illustrate various embodiments of this disclosure. However, please understand that embodiments of this disclosure can be extended to scenarios involving multiple sensing response devices and multiple sensing start devices.

[0087] In environment 200, the sensing start device 210 can communicate wirelessly with the first sensing response device 220 and the second sensing response device 230, and the first sensing response device 220 can communicate wirelessly with the second sensing response device 230. This communication may conform to any suitable communication technology and corresponding communication standards.

[0088] In some embodiments of this disclosure, in WLAN sensing processing, a first sensing response device 220, acting as a sensing receiver, receives a time-domain sensing signal from a second sensing response device 230, acting as a sensing sender. The sensing signal may be implemented based on any suitable signal. For example, the sensing signal may be implemented by sensing a physical layer protocol data unit (PPDU). For instance, the second sensing response device 230 may send a null data packet (NDP) as the sensing signal. The second sensing response device 230 may also send a data packet containing valid data as the sensing signal. The sensing signal may also be another signal known to the first sensing response device 220 and the second sensing response device 230 as receiving and sending parties.

[0089] For example, in low-frequency systems such as those below 7 GHz (e.g., sub-7 GHz), the sensing signal may include a frequency-domain long training field (LTF) sequence. In high-frequency systems such as those at 60 GHz, the sensing signal may include a time-domain channel estimation field (CEF) sequence. This embodiment of this aspect will be described in detail below.

[0090] According to this embodiment of the Disclosure, the first sensing response device 220, with respect to the truncation and feedback of time-domain sensing signals, truncates the received time-domain sensing signal based on a second indication received from the sensing start device 210, and then feeds back the truncated time-domain sensing signal to the second sensing response device 230. The second sensing response device 230 performs channel estimation and target sensing based on the truncated time-domain sensing signal.

[0091] For the sake of discussion, some embodiments of this disclosure will be illustrated by using an example in which the first sensing response device 220 is a sensing receiver and the second sensing response device 230 is a sensing sender. However, it should be understood that this is merely an example and not an limitation. In some embodiments, the sensing starter device 210 may be used as a sensing sender and the first sensing response device 220 may be used as a sensing receiver. In some embodiments, the first sensing response device 220 or the second sensing response device 230 may also perform sending and receiving and act as both a sensing sender and a sensing receiver.

[0092] Since the sensor receiver directly feeds back the truncated time-domain sensor signal, the processing load on the sensor receiver is significantly reduced, and the feedback efficiency is improved. In addition, because the time-domain sensor signal being fed back is truncated, the feedback overhead is reduced, and the sensing performance can be guaranteed to a certain extent.

[0093] Figure 3 shows a sensing result feedback process 300 according to several embodiments of the present disclosure. For the sake of discussion, the process 300 will be described below with reference to Figure 2.

[0094] In process 300, the sensing starter device 210 first performs sensing role assignment. As shown in Figure 3, the sensing starter device 210 sends a first indication to the first sensing response device 220 indicating that the first sensing response device 220 will be used as the sensing receiver (305), and a third indication to the second sensing response device 230 indicating that the second sensing response device 230 will be used as the sensing sender (310). The sensing starter device 210 further sends a second indication to the first sensing response device 220 and the second sensing response device 230 regarding the truncation and feedback of the time-domain sensing signal (315, 320). The indications may be carried by any appropriate message or field, either explicitly or implicitly. This embodiment of this aspect will be described in detail below.

[0095] Next, the second sensing response device 230 sends a time-domain sensing signal to the first sensing response device 220 (325). The first sensing response device 220 transcribes the received time-domain sensing signal (330) and sends the transcribed time-domain sensing signal to the second sensing response device 230 (335). See Figure 4. The transcription and feedback processing of the first sensing response device 220 will be explained below using 2x2 multiple-input multiple-output (MIMO) channel estimation as an example.

[0096] Figure 4 shows exemplary censorship and feedback processing 400 performed in a first sensing response device 220 according to some embodiments of the present disclosure.

[0097] Process 400 pertains to a MIMO scenario with two transmitters, two receivers, and two flows. In process 400, the second sensing response device 230 as the sensing transmitting side sends the frequency-domain LTF sequence as the sensing signal using the P matrix of P = [1 1;1 -1] on two transmit antennas 405 and 410. Note that in the MIMO scenario, the sensing receiver needs to truncate and feedback the time-domain LTF sampling (representing the convolution of the time-domain LTF sequence and the channel) for each decoded flow.

[0098] For example, at two instants (t1, t2), the signals received by the two receive antennas 415 and 420 of the first sensing response device 220 as the sensing receiver are as follows. y 1,1 =(h 1,1 +h 1,2 )*LTF y 2,1 =(h 2,1 +h 2,2 )*LTF y 1,2 =(h 1,1 -h 1,2 )*LTF y 2,2 =(h 2,1 -h<了 2,2 )*LTF

[0099] * is the convolution symbol, and h 1,1 、h 2,1 、h S 1,2 、and h 2,2 represent the channels from transmit antenna 4OS to receive antenna 415, from transmit antenna 405 to receive antenna 420, from transmit antenna 410 to receive antenna 415, and from transmit antenna 410 to receive antenna 420, respectively. LTF represents the time-domain signal of the frequency-domain LTF sequence.

[0100] In some embodiments, the first sensing response device 220 may resolve the time-domain signal of a frequency-domain LTF sequence, which includes channel information and is located on multiple flows, and may obtain, for example, the following: h 1,1 *LTF=(y 1,1 +y 1,2 ) / 2 h 2,1 *LTF=(y 2,1 +y 2,2 ) / 2 h 1,2 *LTF=(y 1,1 -y 1,2 ) / 2 h 2,2 *LTF=(y 2,1 -y 2,2 ) / 2

[0101] Time-domain LTF containing channel information (for example, h 1,1 h 2,1 h 1,2 , and h 2,2 After obtaining the first sensing response device 220, based on a specific ratio, the LTF time-domain signal (e.g., h) containing channel information is obtained. 1,1 *LTF, h 2,1 *LTF, h 1,2 *LTF, and h 2,2 *LTF) will be discontinued and feedback may be provided.

[0102] In some embodiments, the first sensing response device 220 may directly terminate the received signal and feed the signal back. For example, y described above 1,1 , y 2,1 , y 1,2 , and y 2,2 It can be directly truncated and fed back based on the ratio. For example, some time-domain signals such as 1 / 8 and 2 / 8 can be used for feedback, time-domain signal y 1,1 , y 2,1 , y 1,2 , and y 2,2The signal is terminated from the beginning. The terminated portion may be the beginning portion, the middle portion, or the end portion. After receiving these signals, the second sensing response device 230 and the sensing start device 210 perform MIMO channel estimation. In some embodiments, the first sensing response device 220 receives the signal y 1,1 , y 2,1 , y 1,2 , and y 2,2 When the signal is truncated, it must be ensured that it is truncated at the same position to guarantee the effectiveness of channel estimation. In this way, the accuracy of MIMO channel estimation for the second sensing response device 230 and the sensing start device 210 can be guaranteed.

[0103] Unlike the conventional techniques described above (e.g., CSI matrices, compressed CSI, and PDP-based feedback), the feedback is performed based on the channel estimation results. In process 400, the time-domain LTF signal containing channel information is fed back, and channel estimation does not need to be completed during the feedback. In MIMO scenarios, the time-domain LTF signal containing channel information on each flow may need to be solved.

[0104] In some embodiments, the sensing signal transmitted by the second sensing response device 230 includes a cyclic prefix (CP) to resist multipath fading. In practice, CP rejection may be incomplete due to factors such as synchronization errors. In this case, if the first sensing response device 220 truncates the received time-domain sensing signal from the leftmost starting point, the CP portion may also be truncated. An offset is generated as a whole based on the channel estimation result of the truncated time-domain sensing signal. To further improve channel estimation performance, when the first sensing response device 220 performs truncation, consideration may be given to avoiding the CP as much as possible. For example, the first sensing response device 220 may start truncating from an intermediate position in the received time-domain sensing signal to exclude the CP.

[0105] After receiving a truncated time-domain sensing signal from the first sensing response device 220, the second sensing response device 230 performs channel estimation (340) based on the truncated time-domain sensing signal, as shown in Figure 3.

[0106] Figures 5a, 5b, and 5c show the channel estimation performance based on the truncated time-domain LTF sequence when the truncation ratios are 1 / 4, 3 / 8, and 4 / 8, respectively, in the feedback process 400 shown in Figure 4. The truncation ratio can represent the ratio of the length of the time-domain truncated sensing signal to the length of the original sensing signal.

[0107] The channels shown in Figures 5a, 5b, and 5c include two multipaths located at 30m and 60m, respectively, in the propagation path. As shown in the figures, when channel estimation is performed based on an LTF truncated based on a 1 / 4 truncation ratio, the overall sidelobes of the channel estimation result PDP510 increase and the amplitude corresponding to the peak position decreases compared to the channel estimation result PDP505 based on the full LTF. However, the target path information corresponding to the peak position remains correct, and subsequent signal processing can continue based on the channel estimation result to complete target sensing.

[0108] Referring to the channel estimation results PDP515 based on LTF censored with a 3 / 8 censoring ratio shown in Figure 5b, and the channel estimation results PDP520 based on LTF censored with a 4 / 8 censoring ratio shown in Figure 5c, it can be seen that longer LTFs for censoring and feedback (censoring ratio closer to 1) show better channel estimation performance but with greater corresponding feedback redundancy. Conversely, shorter LTFs for censoring and feedback (censoring ratio closer to 0) show less feedback redundancy but lower channel estimation performance.

[0109] In some embodiments, the sensing starter device 210 may function as the performer of channel estimation. In such embodiments, after the first sensing response device 220 has truncated the time-domain sensing signal received from the second sensing response device 230, the first sensing response device 220 may send the truncated time-domain sensing signal to the sensing starter device 210, which then performs channel estimation and target sensing based on the truncated time-domain sensing signal.

[0110] In some embodiments, the sensing start device 210 may also be used as a sensing sender to send a sensing signal to the first sensing response device 220. Correspondingly, after terminating the received time-domain sensing signal, the first sensing response device 220 sends the terminated time-domain sensing signal to the sensing start device 210.

[0111] Figure 6 shows a flowchart of a sensing result feedback method 600 implemented in a sensing start device 210 according to some embodiments of the present disclosure.

[0112] As shown in Figure 6, in block 605, the sensing start device 210 sends a first indication to the first sensing response device 220 indicating that the first sensing response device 220 is to be used as a sensing receiver. The indication may be implemented in any suitable manner. For example, the sensing start device 210 may indicate to the first sensing response device 220 that it should be a sensing receiver by using an announcement frame.

[0113] In block 610, the sensing start device 210 sends a second indication to the first sensing response device 220, which indicates to the first sensing response device 220 that it should feed back the truncated time-domain channel estimation and sensing sequence. The time-domain channel estimation and sensing sequence are low-frequency number territoryThis may include time-domain signals from a range LTF sequence and / or a high-frequency time-domain CEF sequence.

[0114] In embodiments where the second sensing response device 230 is the sensing feeder, the sensing starter device 210 may further send a third indication to the second sensing response device 230 indicating that the second sensing response device 230 is to be used as the sensing feeder, and a second indication to the second sensing response device 230 indicating that channel estimation and target sensing should be performed based on the truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device 220. An exemplary implementation of the sensing starter device 210 sending a second indication regarding the truncation and feedback of the time-domain channel estimation and sensing sequence will be discussed below with reference to Figure 7.

[0115] Figure 7 shows exemplary sensing processes 700 according to several embodiments of the present disclosure.

[0116] As shown in Figure 7, the sensing process 700 includes a discovery stage 705, a setup stage 710, a measurement stage 715, and a feedback stage 720. In the discovery stage 705, the sensing starter device 210 sends a sensing request (SENS. request) frame 725, and the first sensing response device 220 and the second sensing response device 230 return sensing response (SENS. response) frames 730 and 735 to exchange information such as device capabilities.

[0117] In the setup phase 710, the sensing start device 210 sends an announcement frame 740 to assign a sensing role and specify the transmission period for the sensing signal. In this example, the sensing start device 210 is used as the sender of the sensing signal, and both the first sensing response device 220 and the second sensing response device 230 are used as receivers of the sensing signal. The first sensing response device 220 and the second sensing response device 230 respond with confirmation frames 745 and 750.

[0118] In measurement stage 715, the sensing starter device 210 sends a sensing physical layer protocol data unit (PPDU). In this example, the sensing starter device 210 sends a null data packet (NDP) 755 as a sensing signal to the first sensing response device 220 and the second sensing response device 230. Furthermore, the sensing starter device 210 also sends a null data packet announcement (NDPA) frame 760.

[0119] In the feedback phase 720, the sensing start device 210 sends a trigger frame 765 to trigger the first sensing response device 220 and the second sensing response device 230 to perform truncation and feedback. Correspondingly, the first sensing response device 220 and the second sensing response device 230 truncate the received time-domain LTF signal and then feed back the truncated long training field (T-LTF) signals 770 and 775.

[0120] In some embodiments, the sensing start device 210 may send a second indication regarding time-domain channel estimation and censoring and feedback of the sensing sequence by using an announcement frame 740 of the sensing setup stage 710. The announcement frame 740 may include an indication of the censoring ratio (referred to as the "fourth indication"). For example, the announcement frame 740 may include a report ratio field used to indicate the censoring ratio. Table 1 below shows an example of a report ratio field.

[0121] [Table 1]

[0122] In this example, the reporting ratio field has 3 bits, where a value of 000 indicates a censoring ratio of 1 / 8, a value of 001 indicates a censoring ratio of 2 / 8, and so on. The censoring ratio can represent the ratio of the length of the LTF that is censored in the time domain to the original LTF. The censored portion may be any part of the LTE time domain signal, including, for example, the head, middle portion, or tail. As shown in Figures 5a, 5b, and 5c, a smaller censoring ratio indicates a smaller amount of signal feedback, but channel estimation performance is correspondingly reduced. Correspondingly, a larger ratio (longer time domain LTF is fed back) indicates a larger amount of feedback, and channel estimation performance is correspondingly improved.

[0123] In some embodiments, censoring and feedback for time-domain channel estimation and sensing sequences may be implicitly indicated by the use of a reporting ratio field. For example, if an alert frame 740 received by a first sensing response device 220 from a sensing start device 210 has a reporting ratio field, the first sensing response device 220 may determine that censoring feedback for time-domain channel estimation and sensing sequences should be performed, and may determine the corresponding censoring ratio based on the value of a bit contained in the reporting ratio field.

[0124] The method of indicating termination and feedback by using notification frame 740 can be applied to low-frequency systems such as below 7 GHz (e.g., sub-7 GHz) and high-frequency systems such as 60 GHz. In low-frequency systems such as sub-7 GHz (e.g., 11ax and 11be), the sensing starter device 210 may also send a second indication of termination and feedback to the first sensing response device 220 and the second sensing response device 230 by using trigger frame 765 and / or NDPA frame 760. Existing fields in the above frames may be reused for sending the second indication, or new fields may be used.

[0125] Please refer to Figures 8a, 8b, and 8c below. An exemplary implementation is discussed in which the sensing start device 210 sends a second indication regarding censorship and feedback to the first sensing response device 220 or the second sensing response device 230 by using a trigger frame 765 in the feedback phase 720.

[0126] First, please refer to Figure 8a. An exemplary frame format of trigger frame 765 is shown according to some embodiments of the present disclosure.

[0127] For example, a second indication regarding termination and feedback may be transmitted using the Common info field 805 of the trigger frame 765, or a dedicated info field such as the STA info 1 field 810. Any field in the Common info field 805 and the dedicated info fields may be reused, or new fields may be designed, in order to transmit the indication.

[0128] Figure 8b shows an exemplary frame format of the common information field 805 of a trigger frame 765 according to some embodiments of the present disclosure. For example, the trigger type field 815 included in the common information field 805 of the trigger frame indicates that termination and feedback should occur. Show For example, a new trigger type called T-LTF extraction (T-LTF pole) has been added, which allows for censorship and feedback. Show Obtain. Table 2 below shows examples of trigger type field values.

[0129] [Table 2]

[0130] As shown in Table 2, when the trigger type field value is 8, it indicates that time-domain channel estimation and sensing sequence censoring and feedback should be performed. Correspondingly, when a trigger frame with a trigger type field value of 8 is received, the first sensing response device 220 or the second sensing response device 230 may determine that the sensing starter device 210 should perform censoring and feedback for time-domain channel estimation and sensing sequence.

[0131] In embodiments where WLAN sensing processing further supports PDP data feedback, the common information field 805 of the trigger frame may indicate two trigger types: PDP report extraction (PDP report pole) and T-LTF extraction. Table 3 below shows another example of trigger type field values.

[0132] [Table 3]

[0133] In the examples shown in Table 3, a trigger type field value of 8 indicates that PDP data feedback should be performed. When the trigger type field value is 9, it indicates that time-domain channel estimation and sensing sequence censoring and feedback should be performed. The first sensing response device 220 or the second sensing response device 230 may perform the corresponding feedback processing based on the trigger type field value. In some embodiments, another reserved value for the trigger type field (e.g., values ​​from 10 to 15) may be further used to indicate T-LTF extracted frames.

[0134] In some embodiments, the sensing start device 210 may further send a fourth indication of the censorship ratio by using the trigger-based common information (trigger-dependent common information) field 820 in the common information field 805 shown in Figure 8b.

[0135] Figure 8c shows an exemplary frame structure of the trigger-based common information field 820 in the common information field 805 of the trigger frame 765 according to some embodiments of the present disclosure. In this example, the trigger-based common information field 820 includes the reporting ratio field 825. The values ​​of the reporting ratio field 825 are shown, for example, in Table 1 above.

[0136] Refer to Figures 9a and 9b below. An exemplary implementation is discussed in which the sensing start device 210 sends a second indication regarding termination and feedback to the first sensing response device 220 or the second sensing response device 230 by using a null data packet notification (NDPA) frame 760 in the measurement phase 715.

[0137] Figure 9a shows an exemplary frame format of the NDPA frame 760 according to several embodiments of the present disclosure.

[0138] For example, a second indication of time-domain channel estimation and sensing sequence termination and feedback may be transmitted by using a dedicated information field such as the sounding dialog token field 905 or the STA info 1 field 910 of the NDPA frame 760. The indication may be transmitted by reusing either the sounding dialog token field 905 or the STA info 1 field 910, or by designing a new field.

[0139] Figure 9b shows an exemplary frame format of station information field 910 of an NDPA frame 760 according to some embodiments of the present disclosure.

[0140] In this example, the 11-bit association identifier (AID11) field 915 in station information 1 field 910 is used to transmit a second indication of time-domain channel estimation and sensing sequence termination and feedback. Station information 1 field 910 may also include a report ratio field 920.

[0141] Existing fields in high-efficiency (HE) NDPA frames within the Wireless Fidelity (Wi-Fi) 6 standard can be reused to transmit indications associated with time-domain channel estimation and sensing sequence censoring and feedback. Table 4 provides illustrative definitions of the relevant fields in HE NDPA frames.

[0142] [Table 4]

[0143] Existing fields in the extremely high throughput (EHT) NDPA frame in the Wi-Fi 7 standard can also be reused to transmit indications associated with time-domain channel estimation and sensing sequence censorship and feedback. Table 5 shows illustrative definitions of fields in the EHT NDPA frame for transmitting indications associated with censorship and feedback.

[0144] [Table 5]

[0145] In some embodiments, a sensing NDPA frame format based on 11az ranging NDPA may be designed. Table 6 below shows exemplary definitions of fields in the sensing NDPA frame for sending indications associated with censorship and feedback.

[0146] [Table 6]

[0147] In high-frequency systems such as 60 GHz (e.g., 11ad and 11ay), the sensing starter device 210 may also send a second indication of censorship and feedback to the first sensing response device 220 and the second sensing response device 230 by using a beam refinement protocol (BRP) frame. Existing fields in the above frame may be reused for sending the second indication, or new fields may be used. Specific embodiments of this aspect will be described below with reference to Figures 10 to 12.

[0148] Figure 10 shows an exemplary high-frequency beam training process 100 according to some embodiments of the present disclosure.

[0149] As shown in Figure 10, in high-frequency systems, the beam training starter 1005 and beam training responder 1010 need to perform beam training. After acquiring the rough beam scanning direction, the transceivers 1005 and 1010 may perform beam refinement using a beam refinement protocol (BRP). In some embodiments, time-domain channel estimation and sensing sequence truncation and feedback in high-frequency systems may be completed based on modification of the BRP frame. An exemplary structure of the BRP frame is shown in Table 7 below.

[0150] [Table 7]

[0151] In some embodiments, the reserved bit of the BRP request field, numbered 4 in the BRP frame, may be used to satisfy the need to implement censoring feedback for the channel estimation sequence.

[0152] Figure 11 shows an exemplary structure of the BRP request field 1100 according to several embodiments of the present disclosure.

[0153] As shown in Figure 11, the reserved bits of the conventional BRP request field are set to the EDMG Truncated Channel Estimation Sequence (EDMG-TRUNCATED-CEF) field 1105, which is used to indicate the truncation and feedback of the time-domain sensing channel. In this way, the reserved field 1110 has the remaining 2 bits. EDMG-T RA value of 1 in the UNCATED-CEF field 1105 may indicate that time-domain sampling of the censored channel estimation sequence is required for feedback. A value of 0 in the EDMG-TUNCATED-CEF field 1105 indicates that time-domain sampling of the censored channel estimation sequence is not required for feedback.

[0154] In some other embodiments, the DMG beam refinement element field numbered 5 in the BRP frame may be used to indicate censorship and feedback.

[0155] Figure 12 shows an exemplary structure of a DMG beam refining element field 1200 according to several embodiments of the present disclosure.

[0156] As shown in Figure 12, in some embodiments, the truncated channel estimation sequence feedback (truncated CEF FBCK-REQ) field 1205 of the DMG beam refining element field 1200 truncates and provides feedback for the time-domain channel estimation and sensing sequences. Show The truncated channel estimation sequence feedback field 1205 may include the signal-to-noise ratio (SNR) feedback requirement (required SNR) subfield 1210, the truncated channel estimation sequence feedback requirement (required truncated CEF) subfield 1215, the report ratio subfield 1220, and the sector identifier (ID) order feedback requirement (required sector ID order) subfield 1225. The meanings of the subfields are shown in Table 8 below.

[0157] [Table 8]

[0158] In some other embodiments, the truncated channel estimation sequence feedback type (truncated CEF FBCK-TYPE) field 1230 of the DMG beam refining element field 1200 truncates and provides feedback for the time-domain channel estimation and sensing sequence. Show As shown in Figure 12, the truncated CEF FBCK-TYPE field 1230 includes the current SNR feedback (SNR present) subfield 1235, the truncated channel estimation sequence feedback (current truncated CEF) subfield 1240, the report ratio subfield 1245, the number of measurements subfield 1250, the sector ID order feedback (current sector ID order) subfield 1255, the link type subfield 1260, and the antenna type subfield 1265. The meaning of the subfields is shown in Table 9 below.

[0159] [Table 9-1]

[0160] [Table 9-2]

[0161] The first sensing response device 220 can therefore perform censoring and feedback after receiving a second indication from the sensing start device 210 regarding time-domain channel estimation and censoring and feedback of the sensing sequence. The specific processing of censoring and feedback by the first sensing response device 220 will be discussed below with reference to Figure 16.

[0162] Figure 13 shows a flowchart of a time-domain channel estimation and sensing sequence truncation and feedback method 1300 in a first sensing response device 220 according to some embodiments of the present disclosure.

[0163] As shown in Figure 13, in block 1305, the first sensing response device 220 receives a first indication from the sensing starter device 210 indicating that the first sensing response device 220 is to be used as a sensing receiver. In block 1310, the first sensing response device 220 receives a second indication from the sensing starter device 210 regarding time-domain channel estimation and sensing sequence truncation and feedback. The implementation and transmission methods of the first and second indications described above with reference to Figures 6 to 15 may be used. Details will not be described again.

[0164] In block 1315, the first sensing response device 220 truncates the received time-domain channel estimation and sensing sequence. In embodiments in which the first sensing response device 220 receives a fourth indication of the censoring ratio from the sensing starter device 210, the first sensing response device 220 may truncate the time-domain channel estimation and sensing sequence based on the censoring ratio. When the time-domain channel estimation and sensing sequence includes a cyclic prefix (CP), the first sensing response device 220 may avoid the CP as much as possible during censoring, for example, by starting from the middle of the signal rather than from the leftmost part of the signal to exclude the CP, thereby further improving the efficiency of channel estimation.

[0165] For example, low frequency number territoryIn embodiments where the frequency-domain LTF sequence is a sequence for channel estimation (which may also be used for sensing at 11bf), when transmitting, the sensing sender must perform an inverse Fourier transform on the frequency-domain LTF sequence to convert it to the time domain for transmission. Correspondingly, after receiving the time-domain LTF sequence, the first sensing response device 220, as a sensing receiver, performs CP rejection and truncation on the time-domain LTF sequence (i.e., performs feedback by taking a portion of the time-domain LTF sequence).

[0166] In embodiments where the high-frequency channel estimation field (CEF) sequence is a sequence for channel estimation (which may also be used for sensing at 11bf), the high-frequency channel estimation field (CEF) sequence is a time-domain sequence at 11ad. Correspondingly, after receiving the time-domain CEF, the first sensing response device 220 performs CP removal and censoring on the time-domain CEF (i.e., performs feedback by taking a portion of the time-domain CEF sequence).

[0167] In block 1320, the first sensing response device 220 feeds back the truncated time-domain channel estimate and sensing sequence. In some embodiments, the first sensing response device 220 may send the truncated time-domain channel estimate and sensing sequence to the sensing starter device 210, so that the sensing starter device 210 can perform channel estimation based on the received truncated time-domain channel estimate and sensing sequence. In this case, the sensing starter device 210 can be used as the sender of the sensing signal. Alternatively, the sensing starter device 210 may be used as the executor of channel estimation rather than as the sender of channel estimation and sensing sequence.

[0168] In embodiments where the first sensing response device 220 receives channel estimation and sensing sequences from the second sensing response device 230, the first sensing response device 220 may send the second sensing response device 230 a truncated time-domain channel estimation and sensing sequence, thereby enabling the second sensing response device 230 to perform channel estimation based on the truncated time-domain channel estimation and sensing sequence. Similarly, in some embodiments, the second sensing response device 230 may be used as the channel estimation executioner rather than as the source of the sensing signal.

[0169] In some embodiments, the dedicated frame may also be designed so that the first sensing response device 220 performs censorship and feedback. In some embodiments, a new type T-LTF may be added to the HE action field by using reserved bits of the HE action field, as shown in Table 10.

[0170] [Table 10]

[0171] As shown in Table 10, a value of 4 in the HE action field indicates that the frame is a T-LTF frame, and T-LTF frames carry the relevant censorship and feedback information. In this example, in addition to censorship and feedback, PDP data feedback is also supported. As shown in Table 10, a value of 3 in the HE action field indicates that PDP data feedback should be performed.

[0172] In some other embodiments, PDP data feedback may not be used. Table 11 shows exemplary values ​​for the HE action field in this case.

[0173] [Table 11]

[0174] As shown in Table 11, in this case, if the value of the HE action field is 3, it indicates that time-domain channel estimation and sensing sequence censoring and feedback should be performed.

[0175] Table 12 shows example values ​​for the action field in the HE T-LTF frame.

[0176] [Table 12]

[0177] As shown in Table 12, when the value of the action field of an HE T-LTF frame is 3, it indicates that the frame carries HE MIMO control information. When the value of the action field of an HE T-LTF frame is 5, it indicates that the frame carries an HE T-LTF report used by the first sensing response device 220 to feed back the truncated time-domain channel estimation and sensing sequence.

[0178] The HE MIMO control field may be designed based on an existing HE frame structure. The HE MIMO control field may include an indication for at least one of the following: the number of columns, the number of rows, or the number of quantization bits of the T-LTF matrix to be fed back, and some fields in the field may be set to reserved. Figure 14 shows an exemplary frame structure of an HE MIMO control field 1400 according to some embodiments of the present disclosure, and the meaning of the fields is shown in Table 13 below.

[0179] [Table 13]

[0180] In some embodiments, as shown in Table 14, a new type T-LTF may be added to the EHT action field by using reserved bits of the EHT action field.

[0181] [Table 14]

[0182] As shown in Table 14, a value of 2 in the EHT action field indicates that the frame is a T-LTF frame and carries relevant censorship and feedback information. In this example, in addition to censorship and feedback, PDP data feedback is also supported. As shown in Table 14, a value of 1 in the EHT action field indicates that PDP data feedback is required.

[0183] In some embodiments, PDP data feedback may not be used. Table 15 shows exemplary values ​​for the EHT action field in this case.

[0184] [Table 15]

[0185] In the example shown in Table 15, a value of 1 in the EHT action field indicates that time-domain channel estimation and sensing sequence censoring and feedback should be performed.

[0186] Table 16 shows example values ​​for the action field in an EHT T-LTF frame.

[0187] [Table 16]

[0188] As shown in Table 16, when the value of the action field of an EHT T-LTF frame is 3, it indicates that the frame carries EHT MIMO control information. When the value of the action field of an EHT T-LTF frame is 4, it indicates that the frame carries EHT T-LTF reporting information used by the first sensing response device 220 to feed back the truncated time-domain channel estimation and sensing sequence.

[0189] The EHT MIMO control field may be designed based on an existing EHT frame structure, as shown in Figure 15. The EHT MIMO control field may include an indication for at least one of the following: the number of columns, the number of rows, or the number of quantization bits of the T-LTF matrix to be fed back, and some fields within the field may be set to reserved.

[0190] Figure 16 shows an exemplary frame structure of an EHT MIMO control field 1600 according to some embodiments of the present disclosure, and the meaning of the fields is shown in Table 17 below.

[0191] [Table 17]

[0192] The following describes an exemplary process in which the first sensing-response device 220 feeds back the truncated time-domain channel estimation and sensing sequence in a MIMO scenario. In this example, the LTF sequence is used as the frequency-domain sensing signal. When signal estimation is performed, the first sensing-response device 220 truncates the time-domain signal of the LTF for each flow obtained through solving, based on the reporting ratio, and then feeds back the corresponding complex number data. For example, a specific number of feedback points L = reporting ratio * number of time-domain LTF points.

[0193] Thus, the dimension of the T-LTF matrix that needs to be fed back is N STS It can be expressed as ×Nr×L, and N STS represents the quantity of spatial flow, Nr represents the quantity of connected channels at the receiving end, and L represents the length of data that needs to be fed back on each flow and each receiving link. The format of the feedback data is encoded as follows: Each spatiotemporal flow (1,···,N) STS , totaling N STS ) includes the following information: {The feedback matrix has a width of 3 bits, and the feedback matrix contains Nr rows (1, ..., totaling Nr), and each row contains the following information: {This includes L complex numbers (1, ..., totaling L), and for each complex number, quantized transmission is performed based on a real part (Nb bits) and an estimation part (Nb bits). } }

[0194] Nb may correspond to the codebook information / coefficient size field (3 bits) in the HE MIMO control field shown in Table 13.

[0195] The first sensing response device 220 can use T-LTF reporting information to provide feedback on the censored time-domain channel estimation and sensing sequence. Table 18 below shows specific HE T-LTF reporting information.

[0196] [Table 18]

[0197] Table 19 below shows specific EHT T-LTF reporting information.

[0198] [Table 19]

[0199] In Tables 18 and 19, Nb represents the quantization bits, L = reporting ratio * number of time-domain LTF points, Nr represents the number of receiving channels in the receiver / reporting device, and NSTS represents the number of spatiotemporal flows.

[0200] In high-frequency systems, in embodiments where the sensing start device 210 uses the BRP request field in the BRP frame or the directional multi-gigabit (DMG) beam adjustment element field to indicate that feedback should be performed on the time-domain channel estimation and sensing sequence, the first sensing response device may feed back the truncated time-domain channel estimation and sensing sequence by using the sensing feedback element field. Table 20 below shows specific information for the sensing feedback element field.

[0201] [Table 20-1]

[0202] [Table 20-2]

[0203] Please understand that the operations and features described above, referring to Figures 2 through 12, are also applicable to Method 1300 and have the same effect. Further details will not be explained again.

[0204] As described above, in an embodiment where the first sensing response device 220 is a sensing receiver and the second sensing response device 230 is a sensing sender, the first sensing response device 220 may send a truncated time-domain channel estimation and sensing sequence to the second sensing response device 230. The second sensing response device 230 may then perform channel estimation and target sensing based on the truncated time-domain channel estimation and sensing sequence. The specific processing of the second sensing response device 230 will be described below with reference to Figure 17.

[0205] Figure 17 shows a flowchart of a channel estimation method 1700 implemented in a second sensing response device 230 as a sensing sender according to some embodiments of the present disclosure.

[0206] As shown in Figure 17, in block 1705, the second sensing response device 230 receives a third indication from the sensing starter device 210 indicating that the second sensing response device 230 will be used as the sensing sender. In block 1710, the second sensing response device 230 receives a second indication from the sensing starter device 210 regarding the truncation and feedback of the time-domain channel estimation and sensing sequence. In block 1715, the second sensing response device 230 sends the time-domain channel estimation and sensing sequence to the first sensing response device 220. In block 1720, the second sensing response device 230 receives the truncated time-domain channel estimation and sensing sequence from the first sensing response device 220. The implementation and transmission methods of the second and third indications, the implementation and transmission methods of the channel estimation and sensing sequence, and the implementation of truncation and feedback may be used, as described with reference to Figures 6 to 16. Details will not be described again.

[0207] In block 1725, the second sensing response device 230 performs channel estimation based on the truncated time-domain channel estimation and sensing sequence. Any currently known and future channel estimation methods may be used herein, and the scope of this disclosure is not limited thereto.

[0208] Figures 18a and 18b show channel estimation results based on time-domain LTF sequences with a 4 / 8 censoring ratio according to some embodiments of the present disclosure. Figure 18b is a localized magnification of Figure 18a.

[0209] In Figures 18a and 18b, the horizontal axis represents the SNR, and the vertical axis represents the normalized parameter estimation accuracy. As shown in Figure 18a, overall, as the SNR increases, the estimation accuracy also improves accordingly. During quantization, quantization bits of the same length are used for the real / imaginary parts. As shown in Figures 18a and 18b, when five or more quantization bits are used for the real / imaginary parts, the estimation accuracy no longer improves significantly. Therefore, in some embodiments, the quantities of quantization bits listed in Table 13 are used, thereby further reducing the feedback overhead and ensuring channel estimation while improving feedback efficiency.

[0210] Please understand that the operations and features described above, referring to Figures 2 through 16, are also applicable to Method 1700 and have the same effect. Further details will not be explained again.

[0211] Embodiments of this disclosure further provide corresponding devices for implementing the above methods or processes. Figure 19 shows a schematic block diagram of the structure of a device 1900 implemented in a sensing start device 210 according to some embodiments of this disclosure.

[0212] As shown in Figure 19, the apparatus 1900 includes a first transmitting module 1905 configured to send a first indication to a first sensing response device 220 using a sensing start device 210, indicating that the first sensing response device 220 is to be used as a sensing receiver, and a second transmitting module 1910 configured to send a second indication to the first sensing response device 220 using the sensing start device 210, the second indication indicating to the first sensing response device 220 that it should receive feedback of the truncated time-domain channel estimate and sensing sequence.

[0213] In some embodiments, the apparatus 1900 further includes a first receiving module configured to receive a truncated time-domain channel estimation and sensing sequence from a first sensing response device 220 by using a sensing start device 210, and a first channel estimation module configured to perform channel estimation and target sensing based on the truncated time-domain channel estimation and sensing sequence by using the sensing start device 210.

[0214] In some embodiments, the truncated time-domain channel estimate and sensing sequence fed back by the first sensing response device 220 is part of the time-domain LTF sequence received by the first sensing response device 220. The first receiving module is configured to receive the truncated time-domain channel estimate and sensing sequence from the first sensing response device 220, by using the sensing start device 210 and by using the T-LTF frame.

[0215] In some embodiments, the truncated time-domain channel estimate and sensing sequence, which are fed back by the first sensing response device 220, are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0216] In some embodiments, the truncated time-domain channel estimate and sensing sequence fed back by the first sensing response device 220 is part of the time-domain CEF sequence received by the first sensing response device 220. The first receiving module is configured to receive the truncated time-domain channel estimate and sensing sequence from the first sensing response device 220 by using a sensing start device 210 and by using a sensing feedback element field.

[0217] In some embodiments, the device 1900 further includes a third transmitting module configured to send a third indication to a second sensing response device 230 by using a sensing start device 210, indicating that the second sensing response device 230 is to be used as the sensing sender. The second transmitting module is further configured to send a second indication to the second sensing response device 230, the second indication further indicating that the second sensing response device 230 should perform channel estimation and target sensing based on a truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device 220.

[0218] In some embodiments, the device 1900 further includes a fourth transmitting module configured to send a fourth indication regarding time-domain channel estimation and the truncation ratio of the sensing sequence to the first sensing response device 220 by using a sensing start device 210.

[0219] In some embodiments, the first transmitting module 1905 is configured to send a second indication to the first sensing response device 220 by using the sensing start device 210, by using at least one of the following: an announcement frame, a trigger frame, a null data packet announcement (NDPA) frame, or a beam refining protocol (BRP) frame.

[0220] In some embodiments, a common information field or dedicated information field in the trigger frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence. In some embodiments, a trigger type field included in the common information field in the trigger frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence. In some embodiments, a sounding dialogue token field or dedicated information field in the NDPA frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence. In some embodiments, an association identifier (AID) field included in the dedicated information field in the NDPA frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence. In some embodiments, a BRP request field or directional multi-gigabit (DMG) beam adjustment element field in the BRP frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence.

[0221] Figure 20 shows a schematic block diagram of the structure of the device 2000 implemented in the first sensing response device 220 according to some embodiments of the present disclosure.

[0222] As shown in FIG. 20, the apparatus 2000 includes a second receiving module 2005 configured to receive, from the sensing start device 210 by using the first sensing response device 220, a first indication indicating that the first sensing response device 220 is used as a sensing receiver; a third receiving module 2010 configured to receive, from the sensing start device 210 by using the first sensing response device 220, a second indication, where the second indication indicates to the first sensing response device that the truncated time domain channel estimation and sensing sequence should be fed back; a truncation module 2015 configured to truncate the received time domain channel estimation and sensing sequence by using the first sensing response device 220; and a feedback module 2020 configured to feedback the truncated time domain channel estimation and sensing sequence by using the first sensing response device 220.

[0223] In some embodiments, the apparatus 2000 further includes a fourth receiving module configured to receive, from the sensing start device by using the first sensing response device 220, a fourth indication regarding a truncation ratio of the time domain channel estimation and sensing sequence. In these embodiments, the truncation module 2015 is configured to truncate the time domain channel estimation and sensing sequence based on the truncation ratio and by using the first sensing response device 220. In some embodiments, the time domain channel estimation and sensing sequence includes a cyclic prefix CP. The truncated time domain channel estimation and sensing sequence excludes the CP.

[0224] In some embodiments, the feedback module 2020 is configured to send the truncated time-domain channel estimation and sensing sequence to the sensing start device 210 by using the first sensing response device 220. In some embodiments, the time-domain channel estimation 2 and the sensing sequence are received from the second sensing response device 2 3 0 by the first sensing response device 2. In these embodiments, the feedback module 2020 is configured to send the truncated time-domain channel estimation and sensing sequence to the second sensing response device 230 by using the first sensing response device 220.

[0225] In some embodiments, the third receiving module 2010 is configured to receive a second indication from the sensing start device 210 by using at least one of an announcement frame, a trigger frame, an NDPA frame, or a BRP frame by using the first sensing response device 220.

[0226] In some embodiments, the common information field or the dedicated information field in the trigger frame indicates that truncation and feedback are to be performed on the time-domain channel estimation and the sensing sequence. In some embodiments, the trigger type field included in the common information field in the trigger frame indicates that truncation and feedback are to be performed on the time-domain channel estimation and the sensing sequence. In some embodiments, the sounding dialog token field or the dedicated information field in the NDPA frame indicates that truncation and feedback are to be performed on the time-domain channel estimation and the sensing sequence. In some embodiments, the AID field included in the dedicated information field in the NDPA frame indicates that truncation and feedback are to be performed on the time-domain channel estimation and the sensing sequence.

[0227] In some embodiments, the truncated time-domain channel estimation and sensing sequence is part of the time-domain LTF sequence received by the first sensing response device 220. The feedback module 2020 is configured to feed back the truncated time-domain channel estimation and sensing sequence using the T-LTF frame by using the first sensing response device 220.

[0228] In some embodiments, the truncated time-domain channel estimate and sensing sequence, which are fed back by the first sensing response device 220, are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0229] In some embodiments, the BRP request field or DMG beam adjustment element field in the BRP frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence. In some embodiments, the censored time-domain channel estimation and sensing sequence is part of the time-domain CEF sequence received by the first sensing response device 220. The feedback module 2020 is configured to feed back the censored time-domain channel estimation and sensing sequence by using the first sensing response device 220 and by using the sensing feedback element field.

[0230] Figure 21 shows a schematic block diagram of the structure of the device 2100 implemented in a second sensing response device 230 according to some embodiments of the present disclosure.

[0231] As shown in Figure 21, Apparatus 2 100 comprises a fifth receiving module 2105 configured to receive a third indication from the sensing starter device 210 by using the second sensing response device 230, indicating that the second sensing response device 230 is to be used as the sensing sender, and a sixth receiving module 2110 configured to receive a second indication from the sensing starter device 210 by using the second sensing response device 230, the second indication indicating to the second sensing response device 230 that channel estimation and target sensing should be performed based on the truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device 220. The system includes a sixth receiving module 2110, a fifth transmitting module 2115 configured to send time-domain channel estimation and sensing sequences to the first sensing response device 220 using a second sensing response device 230, a seventh receiving module 2120 configured to receive truncated time-domain channel estimation and sensing sequences from the first sensing response device 220 using a second sensing response device 230, and a second channel estimation module 2125 configured to perform channel estimation and target sensing based on the truncated time-domain channel estimation and sensing sequences using the second sensing response device 230.

[0232] In some embodiments, the sixth receiving module 2110 is configured to receive a second indication from the sensing start device 210 by using the second sensing response device 230, by using at least one of an announcement frame, a trigger frame, an NDPA frame, or a BRP frame.

[0233] In some embodiments, a common information field or dedicated information field in the trigger frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence. In some embodiments, a trigger type field included in the common information field in the trigger frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence. In some embodiments, a sounding dialogue token field or dedicated information field in the NDPA frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence. In some embodiments, an AID field included in the dedicated information field in the NDPA frame indicates that censoring and feedback should be performed on the time-domain channel estimation and sensing sequence.

[0234] In some embodiments, the time-domain channel estimation and sensing sequence transmitted by the second sensing response device 230 includes a time-domain LTF sequence. The seventh receiving module 2120 is configured to receive the truncated time-domain channel estimation and sensing sequence from the first sensing response device 220 using the second sensing response device 230, and using T-LTF frames.

[0235] In some embodiments, the truncated time-domain channel estimate and sensing sequence received by the second sensing response device 230 are represented by a T-LTF matrix. The T-LTF frame includes a MIMO control field, which includes an indication for at least one of the following: the number of columns in the T-LTF matrix, the number of rows, or the number of quantization bits of the matrix elements.

[0236] In some embodiments, the BRP request field or DMG beam adjustment element field in the BRP frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

[0237] In some embodiments, the time-domain channel estimation and sensing sequence transmitted by the second sensing response device 230 includes a time-domain CEF sequence. The seventh receiving module 2120 is configured to receive the truncated time-domain channel estimation and sensing sequence from the first sensing response device 220 by using the second sensing response device 230 and by using the sensing feedback element field.

[0238] Referring to Figures 2 through 18b, please understand that the operation and characteristics of the sensing start device 210, the first sensing response device 220, and the second sensing response device 230 described above are also applicable to devices 1900, 2000, and 2100, and have the same effect. Further details will not be explained again.

[0239] The modules contained in devices 1900, 2000, and 2100 may be implemented in a variety of ways, including software, hardware, firmware, or any combination thereof. In some embodiments, one or more modules may be implemented by using software and / or firmware, for example, machine-executable instructions stored on a storage medium. As an addition to or alternative to machine-executable instructions, some or all of the modules in devices 1900, 2000, and 2100 may be implemented at least partially by one or more hardware logic components. Examples of available hardware logic components, not limited to but including, are field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standards (ASSPs), systems-on-a-chip (SOCs), and composite programmable logic devices (CPLDs).

[0240] Figure 22 shows a block diagram of device 2200, in which several embodiments of the present disclosure may be implemented. Device 2200 may be configured to implement the sensing start device 210, the first sensing response device 220, or the second sensing response device 230 shown in Figure 2.

[0241] As shown in Figure 22, device 2200 includes a processor 2210, which controls the operation and functionality of device 2200. For example, in some exemplary embodiments, the processor 2210 can perform various operations by using instructions 2230 stored in a memory 2220 coupled to the processor 2210. The memory 2220 may be any suitable type applicable to the local technical 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 22, there may be multiple physically distinct memory units in device 2200.

[0242] The processor 2210 may be any suitable type appropriate for the local technical environment, but may include, without limitation, one or more of the following: a general-purpose computer, a dedicated computer, a microcontroller, a digital signal processor (DSP), or a controller-based multicore controller architecture. The device 2200 may include multiple processors 2210. The processors 2210 are coupled to a communication unit 2240. The communication unit 2240 can receive and transmit information by using radio signals or through optical fibers, cables, and / or other components.

[0243] When device 2200 operates as a sensing start device 210, processor 2210 may implement the operation and actions of the sensing start device 210 described above with reference to Figures 2 to 15 by executing instructions. When device 2200 operates as a first sensing start device 220, processor 2210 may implement the operation and actions of the first sensing start device 220 described above with reference to Figures 2 to 16 by executing instructions. When device 2200 operates as a second sensing start device 230, processor 2210 may implement the operation and actions of the second sensing start device 230 described above with reference to Figures 2 to 18b by executing instructions. All the features described above with reference to Figures 2 to 22 are applicable to device 2200. Further details are not described again herein.

[0244] In general, various exemplary embodiments of this disclosure may be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. Some embodiments may be implemented in hardware, while others may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device. When embodiments of the exemplary embodiments of this disclosure are illustrated or described as block diagrams, flowcharts, or represented using other figures, it will be understood that the blocks, apparatus, systems, techniques, or methods described herein may be implemented, in non-limiting examples, in hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers, or other computing devices, or any combination thereof.

[0245] As an example, exemplary embodiments of the present disclosure may be described in the context of a computer-readable storage medium storing a program or instructions, a computer program product including the program or instructions, and a computer program and machine-executable or computer-executable instructions. The machine-executable instructions may be included, for example, in program modules executed on a device on a target physical or virtual processor. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc., and perform specific tasks or implement specific abstract data types. In various exemplary embodiments, the functions of the program modules may be combined or divided among the described program modules. The machine-executable instructions for the program modules may be executed locally or within a distributed device. In a distributed device, the program modules may be disposed on both a local storage medium and a remote storage medium.

[0246] The computer program code used to implement the methods disclosed in the present 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 dedicated computer, or another programmable data processing device so that the functions / operations specified in the flowchart and / or block diagram are implemented when the program code is executed by the computer or another programmable data processing device. The program code may be executed entirely on the computer, partially on the computer, as a stand-alone software package, partially on the computer and partially on a remote computer, or entirely on a remote computer or server.

[0247] In the context of this disclosure, machine-readable media or computer-readable media may be any tangible medium having programs that contain, store, or relate to, programs for instruction execution systems, apparatus, or devices. Machine-readable media may be machine-readable signal media or machine-readable storage media. Machine-readable media may include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. More detailed examples of machine-readable storage media include electrical connections to one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0248] In addition, although the operations are described in a specific order, this should not be understood as requiring that such operations be completed in a specific illustrated or sequential order, or that all illustrated operations be performed, in order to obtain the desired result. In some cases, multitasking or parallel processing may be advantageous. Similarly, although the above description includes some specific implementation details, these should not be interpreted as limiting the scope of any invention or claim, but rather as a description of specific exemplary embodiments that may be unique to a particular invention. Some features described herein in the context of separate exemplary embodiments may, as an alternative, be integrated into a single exemplary embodiment. Conversely, various features described in the context of a single exemplary embodiment may, as an alternative, be implemented separately or in any preferred partial combination in multiple exemplary embodiments.

[0249] While the subject matter has been described using language specific to its structural features and / or methodological actions, it should be understood that the subject matter as defined in the attached claims is not limited to the specific features or actions described above. Rather, the specific features and actions described above are disclosed as exemplary forms that implement the claims.

Claims

1. The steps include: sending a first indication to a first sensing response device via a sensing start device, indicating that the first sensing response device is to be used as a sensing receiver; The steps include: sending a second indication to the first sense response device via the sense start device, wherein the second indication indicates to the first sense response device that the truncated time-domain channel estimation and sense sequence should be fed back; A communication method that includes this.

2. The steps include: receiving the truncated time-domain channel estimation and sensing sequence from the first sensing response device using the sensing start device; The sensing start device performs the steps of channel estimation and target sensing based on the terminated time-domain channel estimation and sensing sequence. The method according to claim 1, further comprising:

3. The truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device is part of the time-domain long training field (LTF) sequence received by the first sensing response device. The step of receiving the truncated time-domain channel estimation and sensing sequence includes the step of receiving the truncated time-domain channel estimation and sensing sequence from the first sensing response device using truncated long training field T-LTF frames by the sensing start device. The method according to claim 2.

4. The truncated time-domain channel estimate and sensing sequence, which are fed back by the first sensing response device, are represented by a T-LTF matrix. The T-LTF frame includes a multi-input multi-output MIMO control field, the MIMO control field includes an indication for at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the T-LTF matrix. The method according to claim 3.

5. The truncated time-domain channel estimation and sensing sequence fed back by the first sensing response device is part of the time-domain channel estimation field CEF sequence received by the first sensing response device. The step of receiving the truncated time-domain channel estimation and sensing sequence includes the step of receiving the truncated time-domain channel estimation and sensing sequence from the first sensing response device by the sensing start device using the sensing feedback element field. The method according to claim 2.

6. The steps include: sending a third indication to a second sensing response device via the sensing start device, indicating that the second sensing response device is to be used as the sensing sender; A step of sending a second indication to the second sense-response device by the sense-start device, the second indication further indicating to the second sense-response device that it should perform channel estimation and target sensing based on the truncated time-domain channel estimation and sensing sequence fed back by the first sense-response device; The method according to claim 1, further comprising:

7. The sensing start device sends a fourth indication to the first sensing response device regarding the time-domain channel estimation and the truncation ratio of the sensing sequence. The method according to claim 1, further comprising:

8. The step of sending the second indication is, The sensing start device sends the second indication to the first sensing response device by using at least one of the following: an announcement frame, a trigger frame, a null data packet announcement NDPA frame, or a beam refining protocol BRP frame. The method according to claim 1, including the method described in claim 1.

9. The method of claim 8, which indicates that a common information field or a dedicated information field in the trigger frame performs censoring and feedback to the time-domain channel estimation and sensing sequence.

10. The method of claim 9, wherein the trigger type field included in the common information field in the trigger frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

11. The method according to claim 8, wherein the sounding dialogue token field or dedicated information field in the NDPA frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

12. The method according to claim 11, wherein the association identifier AID field included in the dedicated information field in the NDPA frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

13. The method according to claim 8, wherein the BRP request field or directional multi-gigabit DMG beam adjustment element field in the BRP frame performs truncation and feedback with respect to the time-domain sensing signal.

14. The first step of receiving a first indication from a sensing start device via a first sensing response device, indicating that the first sensing response device is to be used as a sensing receiver, The first sensing response device receives a second indication from the sensing start device, the second indication indicating to the first sensing response device that the truncated time-domain channel estimation and sensing sequence should be fed back; The first sensing response device terminates the received time-domain channel estimation and sensing sequence, The first sensing response device provides feedback of the truncated time-domain channel estimation and sensing sequence. A communication method that includes this.

15. The first sensing response device further includes receiving a fourth indication from the sensing start device regarding the time-domain channel estimation and the truncation ratio of the sensing sequence, The step of terminating the received time-domain channel estimation and sensing sequence includes the step of terminating the received time-domain channel estimation and sensing sequence based on the terminating ratio by the first sensing response device. The method according to claim 14.

16. The aforementioned time-domain channel estimation and sensing sequence includes a cyclic prefix CP. The aforementioned truncated time-domain channel estimation and sensing sequence excludes the CP. The method according to claim 14.

17. The step of feeding back the truncated time-domain channel estimation and sensing sequence is: The first sensing response device sends the truncated time-domain channel estimation and sensing sequence to the sensing start device. The method according to claim 14, including the method described in claim 14.

18. The time-domain channel estimation and sensing sequence are received by the first sensing response device from the second sensing response device. The step of feeding back the truncated time-domain channel estimate and sensing sequence by the first sensing response device includes the step of sending the truncated time-domain channel estimate and sensing sequence by the first sensing response device to the second sensing response device. The method according to claim 14.

19. The step of receiving the second indication is: The first sensing response device receives the second indication from the sensing starter device by using at least one of the following: an announcement frame, a trigger frame, a null data packet announcement NDPA frame, or a beam refining protocol BRP frame. The method according to claim 14, including the method described in claim 14.

20. The method according to claim 19, which indicates that a common information field or a dedicated information field in the trigger frame performs censoring and feedback to the time-domain channel estimation and sensing sequence.

21. The method according to claim 20, wherein the trigger type field included in the common information field in the trigger frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

22. The method according to claim 19, wherein the sounding dialogue token field or dedicated information field in the NDPA frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

23. The method according to claim 22, wherein the association identifier AID field included in the dedicated information field in the NDPA frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

24. The aforementioned truncated time-domain channel estimation and sensing sequence is part of the time-domain long training field (LTF) sequence received by the first sensing response device. The step of feeding back the truncated time-domain channel estimation and sensing sequence includes the step of feeding back the truncated time-domain channel estimation and sensing sequence by the first sensing response device using truncated long training field T-LTF frames. The method according to any one of claims 20 to 23.

25. The truncated time-domain channel estimate and sensing sequence, which are fed back by the first sensing response device, are represented by a T-LTF matrix. The T-LTF frame includes a multi-input multi-output MIMO control field, the MIMO control field includes an indication for at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the T-LTF matrix. The method according to claim 24.

26. The method according to claim 19, wherein the BRP request field or directional multi-gigabit DMG beam adjustment element field in the BRP frame performs censoring and feedback to the time-domain channel estimation and sensing sequence.

27. The aforementioned truncated time-domain channel estimation and sensing sequence is part of the time-domain channel estimation field CEF sequence received by the first sensing response device. The step of feeding back the truncated time-domain channel estimation and sensing sequence includes the step of feeding back the truncated time-domain channel estimation and sensing sequence by the first sensing response device using a sensing feedback element field. The method according to claim 26.

28. The steps include: receiving a third indication from a sensing start device via a second sensing response device that the second sensing response device is to be used as a sensing sender; The steps include: receiving a second indication from the sense-start device via the second sense-response device, wherein the second indication indicates to the second sense-response device that channel estimation and target sensing should be performed based on a truncated time-domain channel estimation and sensing sequence fed back by the first sense-response device; The second sensing response device sends the time-domain channel estimation and sensing sequence to the first sensing response device, The second sensing response device receives the truncated time-domain channel estimate and sensing sequence from the first sensing response device, The second sensing response device performs channel estimation and target sensing based on the truncated time-domain channel estimation and sensing sequence. A communication method that includes this.

29. The step of receiving the second indication is: The second sensing response device receives the second indication from the sensing start device by using at least one of the following: an announcement frame, a trigger frame, a null data packet announcement NDPA frame, or a beam refining protocol BRP frame. The method according to claim 28, which includes the method described above.

30. The method according to claim 29, which indicates that a common information field or a dedicated information field in the trigger frame performs censoring and feedback to the time-domain channel estimation and sensing sequence.

31. The method according to claim 30, wherein the trigger type field included in the common information field in the trigger frame indicates that censorship and feedback are performed for the time-domain channel estimation and sensing sequence.

32. The method according to claim 29, wherein the sounding dialogue token field or dedicated information field in the NDPA frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

33. The method according to claim 32, wherein the association identifier AID field included in the dedicated information field in the NDPA frame indicates that censorship and feedback are performed on the time-domain channel estimation and sensing sequence.

34. The time-domain channel estimation and sensing sequence transmitted by the second sensing response device includes a time-domain long training field (LTF) sequence. The step of receiving the truncated time-domain channel estimation and sensing sequence includes the step of receiving the truncated time-domain channel estimation and sensing sequence from the first sensing response device using truncated long training field T-LTF frames by the second sensing response device. The method according to any one of claims 30 to 33.

35. The truncated time-domain channel estimate and sensing sequence received by the second sensing response device are represented by a T-LTF matrix, The T-LTF frame includes a multi-input multi-output MIMO control field, the MIMO control field includes an indication for at least one of the number of columns, the number of rows, or the number of quantization bits of the matrix elements of the T-LTF matrix. The method according to claim 34.

36. The method according to claim 29, wherein the BRP request field or directional multi-gigabit DMG beam adjustment element field in the BRP frame performs censoring and feedback to the time-domain channel estimation and sensing sequence.

37. The time-domain channel estimation and sensing sequence transmitted by the second sensing response device includes a time-domain channel estimation field CEF sequence, The step of receiving the truncated time-domain channel estimation and sensing sequence includes the step of receiving the truncated time-domain channel estimation and sensing sequence from the first sensing response device by the second sensing response device using the sensing feedback element field. The method according to claim 36.

38. It comprises a processor, the processor is coupled to memory, and the memory stores instructions. When the instruction is executed by the processor, the method according to any one of claims 1 to 12, 13 to 27, or 28 to 37 is performed. Communication device.

39. A computer-readable storage medium storing a program, wherein when at least a portion of the program is executed by a processor in the device, the device implements the method according to any one of claims 1 to 12, 13 to 27, or 28 to 37.

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