Communication method and device

Abstract

The invention provides a communication method and equipment. The communication method comprises the following steps: a communication device sends and / or receives a trigger frame carrying perceptual measurement related information; according to the embodiment of the invention, the sensing measurement can be better supported.

Description

[0001] This application is a divisional application of the patent application with application number 202180104340.7 and application name “Communication Method and Device”. Technical Field

[0002] The present application relates to the field of communications, and more specifically, to a communication method and device. Background Art

[0003] Wireless Local Area Networks (WLAN) sensing can include methods and applications for sensing people or objects in the environment by measuring changes in scattering and / or reflection of WLAN signals by people or objects. WLAN sensing is usually achieved using WLAN signals that comply with wireless communication standards. There is room for improvement in the sensing measurement stage. Summary of the invention

[0004] The embodiments of the present application provide a communication method and device, which can better support perception measurement.

[0005] An embodiment of the present application provides a communication method, including: a communication device sends and / or receives a trigger frame carrying perception measurement related information.

[0006] An embodiment of the present application provides a communication method, including: a communication device sends and / or receives a perception measurement frame based on a trigger frame.

[0007] An embodiment of the present application provides a communication device, including: a communication unit, configured to send and / or receive a trigger frame carrying information related to perception measurement.

[0008] An embodiment of the present application provides a communication device, including: a communication unit, configured to send and / or receive a perception measurement frame based on a trigger frame.

[0009] The embodiment of the present application provides a communication device, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the communication device executes the above communication method.

[0010] The embodiment of the present application provides a chip for implementing the above communication method. Specifically, the chip includes: a processor for calling and running a computer program from a memory so that a device equipped with the chip executes the above communication method.

[0011] An embodiment of the present application provides a computer-readable storage medium for storing a computer program. When the computer program is executed by a device, the device executes the above-mentioned communication method.

[0012] An embodiment of the present application provides a computer program product, including computer program instructions, which enable a computer to execute the above-mentioned communication method.

[0013] An embodiment of the present application provides a computer program, which, when executed on a computer, enables the computer to execute the above-mentioned communication method.

[0014] In the embodiments of the present application, the perception measurement can be better supported by using a trigger frame carrying the perception measurement related information or a perception measurement frame based on the trigger frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of an application scenario according to an embodiment of the present application.

[0016] Figures 2a to 2j is a schematic diagram of WLAN sensing and participants.

[0017] Figure 3 The figure is a flowchart of a WLAN awareness session.

[0018] Figure 4a It is a schematic diagram of WLAN sensing measurement parameter negotiation.

[0019] Figure 4b and Figure 4c is a schematic diagram of threshold-based perceptual measurement.

[0020] Figure 5 is a schematic diagram of the measurement setup and measurement example.

[0021] Figure 6 It is a schematic diagram of the measurement process based on the trigger frame.

[0022] Figure 7a , Figure 7b and Figure 7c It is a schematic diagram of the measurement process based on the trigger frame.

[0023] Figure 8 It is a schematic flowchart of a communication method according to an embodiment of the present application.

[0024] Fig. 9 It is a schematic flowchart of a communication method according to another embodiment of the present application.

[0025] Fig.10 is a schematic diagram of a perception measurement polling trigger frame for triggering transmission of an uplink EHT TB PPDU.

[0026] Fig.11 is a schematic diagram of a perception measurement polling trigger frame for triggering the transmission of an uplink HE TB PPDU.

[0027] Fig.12 It is a schematic diagram of a sensing measurement trigger frame used to trigger the transmission of an uplink EHT TB sensing measurement frame (NDP).

[0028] Fig.13 is a schematic diagram of a sensing measurement trigger frame used to trigger transmission of an uplink HE TB Sensing NDP.

[0029] Fig.14 This is a diagram of the EHT TB Sensing NDP format.

[0030] Fig.15 It is a schematic diagram of the HE TB Sensing NDP format.

[0031] Fig.16 It is a schematic block diagram of a communication device according to an embodiment of the present application.

[0032] Fig.17 It is a schematic block diagram of a communication device according to an embodiment of the present application.

[0033] Fig.18 It is a schematic block diagram of a communication device according to an embodiment of the present application.

[0034] Fig.19 is a schematic block diagram of a chip according to an embodiment of the present application.

[0035] Fig. 20 It is a schematic block diagram of a communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0037] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as wireless local area network (WLAN), wireless fidelity (WiFi) or other communication systems.

[0038] For example, the communication system 100 used in the embodiment of the present application is as follows: Figure 1 The communication system 100 may include an access point (AP) 110 and a station (STA) 120 accessing the network through the access point 110 .

[0039] In some scenarios, AP is also called AP STA, that is, in a sense, AP is also a STA.

[0040] In some scenarios, STA is also called non-AP STA.

[0041] The communication in the communication system 100 may be communication between an AP and a non-AP STA, communication between a non-AP STA and a non-AP STA, or communication between a STA and a peer STA, wherein a peer STA may refer to a device that communicates with the STA peer, for example, a peer STA may be an AP or a non-AP STA.

[0042] AP is equivalent to a bridge connecting wired network and wireless network. Its main function is to connect various wireless network clients together and then connect the wireless network to Ethernet. AP device can be a terminal device (such as a mobile phone) or a network device (such as a router). The terminal device or network device has a chip that realizes the communication function, such as a WLAN or WiFi chip.

[0043] It should be understood that the role of STA in the communication system is not absolute. For example, in some scenarios, when a mobile phone is connected to a router, the mobile phone is a non-AP STA. When the mobile phone serves as a hotspot for other mobile phones, the mobile phone plays the role of an AP.

[0044] APs and non-AP STAs can be devices used in the Internet of Vehicles, IoT nodes and sensors in the Internet of Things (IoT), smart cameras, smart remote controls, smart water and electricity meters in smart homes, and sensors in smart cities.

[0045] In some embodiments, the non-AP STA may support the 802.11be standard. The non-AP STA may also support various current and future 802.11 family wireless local area network (WLAN) standards such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.

[0046] In some embodiments, the AP may be a device supporting the 802.11be standard. The AP may also be a device supporting various current and future 802.11 family WLAN standards such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b and 802.11a.

[0047] In an embodiment of the present application, STA may be a mobile phone, a tablet computer, a computer, a virtual reality (VR) device, an augmented reality (AR) device, a wireless device in industrial control, a set-top box, a wireless device in self-driving, an in-vehicle communication device, a wireless device in remote medical, a wireless device in a smart grid, a wireless device in transportation safety, a wireless device in a smart city or a wireless device in a smart home, a wireless communication chip / ASIC / SOC / etc. that supports WLAN / WiFi technology.

[0048] The frequency bands supported by WLAN technology may include but are not limited to: low frequency bands (eg, 2.4 GHz, 5 GHz, 6 GHz) and high frequency bands (eg, 60 GHz).

[0049] Figure 1 An AP STA and two non-AP STAs are exemplarily shown. Optionally, the communication system 100 may include multiple AP STAs and other numbers of non-AP STAs, which is not limited in the embodiments of the present application.

[0050] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] It should be understood that the "indication" mentioned in the embodiments of the present application can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B.

[0052] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship between indication and being indicated, configuration and being configured, and the like.

[0053] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application.

[0054] 1. WLAN Perception and Participants

[0055] The WLAN terminals participating in sensing may have roles such as sensing session initiator (Sensing initiator), sensing session responder (Sensing Responder), sensing signal sender (Sensing transmitter), and sensing signal receiver (Sensing receiver).

[0056] For example, see Figure 2a STA1 is the sensing initiator (non-standalone), sensing receiver and sensing processor; STA2 is the sensing sender. Figure 2b STA1 is the sensing initiator (non-independent) and sensing sender; STA2 is the sensing receiver and sensing processor. Figure 2c STA1 is the perception initiator (independent) and perception processor; STA2 is the perception receiver; STA3 is the perception sender. Figure 2d STA1 is the perception initiator (non-independent), perception receiver and perception processor; STA2 and STA3 are perception senders. Figure 2e STA1 is the sensing initiator (non-independent), sensing sender and sensing processor; STA2 and STA3 are sensing receivers. Figure 2f , STA1 is the perception initiator (independent), STA2 is the perception receiver and perception processor, and STA3 and STA4 are the perception senders. Figure 2g STA1 is the sensing initiator (non-independent), sensing sender, sensing receiver and sensing processor. Figure 2h STA1 is the sensing initiator (independent), and STA2 is the sensing sender, sensing receiver, and sensing processor. Figure 2i STA1 is the sensing initiator (non-independent), sensing sender, sensing receiver and sensing processor, and STA2 is the sensing sender and sensing receiver. Figure 2j STA1 is the perception initiator (independent) and perception processor, STA2 is the perception sender and perception receiver, and STA3 is also the perception sender and perception receiver. Figures 2a to 2jThe solid arrow in the middle represents the illumination signal, the dashed arrow with short intervals represents the sensing measurement, the dashed arrow with dotted lines represents the sensing result, and the dashed arrow with long intervals represents the echo signal. The illumination signal can also be a sensing measurement signal, which is attenuated and diffracted by a person blocking it, and the signal characteristics change when it is received by the sensing receiving device. The illumination signal is reflected by the person to generate an echo signal, and the sensing receiving device receives the echo signal to perceive the change.

[0057] It should be noted that STA only refers to the role of STA. Figures 2a to 2j In subsequent perception sessions, measurements and other steps, the number of STAs is not limited. For example, the STAs represented by the roles of STA1, STA2 and STA3 may be one or more.

[0058] 2. Overall process of WLAN sensing session

[0059] See also Figure 3 , a WLAN perception session includes one or more of the following phases: Session Setup; Perception Measurement Setup; Perception Measurement; Perception Reporting; Perception Measurement Setup Termination; Session Termination. A WLAN terminal may have one or more roles in a perception session. For example, the perception session initiator may be only the perception session initiator, or may be the perception signal sender, or may be the perception signal receiver, or may be both the perception signal sender and the perception signal receiver.

[0060] Session establishment phase: establish a perception session and determine the device's perception capabilities and common perception parameters.

[0061] Perception measurement setup phase: Determine the perception session participants and their roles (including perception signal senders and perception signal receivers), decide on the operating parameters related to the perception measurement, and optionally exchange the parameters between terminals.

[0062] Perception measurement phase: Perception measurement is implemented, and the perception signal sender sends the perception signal to the perception signal receiver.

[0063] Perception reporting stage: Reporting measurement results. Depending on the application scenario, the perception signal receiver may need to report the measurement results to the perception session initiator.

[0064] Perception measurement setting end phase: The terminal ends the measurement corresponding to the measurement setting and cleans up related resources.

[0065] Session end phase: The terminal stops measuring and terminates the perception session.

[0066] 3. WLAN Awareness Measurement Setting Parameter Negotiation

[0067] When establishing a sensing measurement setup, the terminals may need to negotiate sensing roles and operating parameters one by one, or the terminals may declare their own roles and operating parameters (e.g., through beacon frames or other special frames). Figure 4a , SENSSTA1 can be a sensing initiator and transmitter. SENS STA2 can be a sensing responder and receiver. SENS STA3 can be a sensing responder and transmitter. Mode 1: Terminal SENS STA1 sends a sensing request to SENS STA2, and SENS STA2 sends a sensing response. Mode 3: Terminal SENS STA1 sends a sensing request to SENS STA3, and SENS STA3 sends a sensing response.

[0068] The amount of data in the perception measurement result is usually large. For example, the channel state information (CSI) data of a measurement may reach 4K to 40K bits. In order to reduce the network load caused by reporting the perception measurement result, a measurement threshold can be set. When the difference between the current measurement result and the previous measurement result is less than the threshold, the perception signal receiver reports the perception result, otherwise it does not report.

[0069] For example, Figure 4bAs shown in the figure: In the measurement phase, the sensing sender (SendingTransmitter) can send a measurement announcement frame (NDP Announcement, NDPA), and after a short interframe space (Shortinterframe space, SIFS), send a null data packet (Null Data Packet, NDP). Sensing receiver 1 (SendingReceiver1) and sensing receiver 2 (SendingReceiver2) can perform CSI measurement (Measurement). Figure 4c As shown, in the reporting phase, the sensing initiator sends a feedback request. The sensing receiver 1 determines that the feedback criterion is met and sends a feedback response indicating that it is met. The sensing receiver 2 determines that the feedback criterion is not met and sends a feedback response indicating that it is not met. Then the sensing initiator sends a feedback trigger, and the sensing receiver 1 sends an NDP, CSI, compressed CSI, or a final result.

[0070] IV. Measurement Setup and Measurement Examples

[0071] The initiator of the perception session can establish multiple groups of measurement parameters through the Measurement Setup process. One group of measurement parameters can be identified by a Measurement Setup ID and can be applied to multiple measurements (the multiple measurements can be equivalent to a Burst Group). Each measurement of another group of measurement parameters (which can be equivalent to a Burst) can be identified by a Measurement Instance ID, which can be equivalent to a Burst.

[0072] For example, see Figure 5, the association identifier (AID) of AP = 0, the AID of STA1 = 1, the AID of STA2 = 2, and the unassociation identifier (UID) of STA3 = 3. AP can establish measurement settings with STA1, STA2, and STA 3 at different time points, and the measurement setup identifier (Measurment Setup ID) = 1. AP can send perception measurement polling frames, perception announcement frames, and perception measurement frames to STA1, STA2, and STA 3 at the same time, and the measurement setup identifier = 1 and the measurement instance identifier = 1. AP can send perception measurement polling frames, perception announcement frames, and perception measurement frames to STA1, STA2, and STA 3 at the same time, and the measurement setup identifier = 1 and the measurement instance identifier = 2. STA1 can send a perception measurement reporting frame to the AP to report the perception measurement result of the measurement setup identifier = 1 and the measurement instance identifier = 1.

[0073] The AP can establish measurement settings with STA2 and STA 3 at different time points, and the measurement setting identifier = 2. The AP can send perception measurement polling frames, perception announcement frames and perception measurement frames to STA1, STA2 and STA 3 at the same time, and the measurement setting identifier = 1 and the measurement instance identifier = 3. The AP can send perception measurement polling frames, perception announcement frames and perception measurement frames to STA2 and STA 3 at the same time, and the measurement setting identifier = 2 and the measurement instance identifier = 4. STA3 can send a perception measurement reporting frame to the AP to report the perception measurement results with the measurement setting identifier = 1 and the measurement instance identifier = 1. STA2 can send a perception measurement reporting frame to the AP to report the perception measurement results with the measurement setting identifier = 1 and the measurement instance identifier = 1.

[0074] 5. A measurement process based on trigger frame

[0075] A measurement process based on a trigger frame includes polling, uplink measurement (UL (Uplink) sensing sounding), downlink measurement (DL (Downlink) sensing sounding) and key update. Figure 6 As shown, STA1 and STA2 are sensing transmitters, and STA3, STA 4 and STA 5 are sensing receivers.

[0076] Polling should always be here to check the availability of responder STAsbefore performing the actual sensing measurement.

[0077] STA1-4 responds with CTS-to-self to confirm they will participate in upcoming sensing sounding.

[0078] STA5 does not send CTS-to-self back, so AP will not include STA5 in upcoming sensing sounding.

[0079] UL sensing sounding is optionally present, conditioned on at least one sensing transmitters responds in the polling.

[0080] AP sends a TF (Trigger Frame) to STA1-2 to solicit NDP packet transmission to do UL sensing sounding.

[0081] NDP from STA1-2 could be transmitted simultaneously in UL-MIMO (Multiple-Input Multiple-Output) / UL-OFDMA (Orthogonal Frequency Division Multiple Access).

[0082] DL sensing sounding is optionally present, conditioned on at least one sensing transmitters receiver in the polling.

[0083] AP sends NDPA+NDP to STA3-4 to perform DL sensing sounding.

[0084] Key update is optionally present if secure LTF info needs to be updated and communicated to STAs.

[0085] The updated information can be carried in an action or management frame.

[0086] VI: A measurement process based on trigger frame

[0087] A measurement process based on a trigger frame includes three stages: a sensing measurement setting stage, a sensing measurement stage, and a sensing measurement reporting stage, as shown in FIG. Figure 7a , Figure 7b and Figure 7c shown.

[0088] like Figure 7aAs shown, the process of the perception measurement setting phase based on the trigger frame may include: a certain initiating device, such as AP, may send a perception measurement setting request frame to multiple responding devices (for example, responding devices 1, 2, and 3 are STA1, STA12, and STA3, respectively). STA1, STA12, and STA3 send perception measurement setting response frames to AP in different time periods.

[0089] like Figure 7b As shown, the process of the perception measurement phase based on the trigger frame may include: during the measurement polling process, the initiating device such as AP can simultaneously send perception measurement polling trigger frames to multiple responding devices such as responding devices 1, 2, and 3, which are STA1, STA12, and STA3 respectively. STA1, STA12, and STA3 respectively send permission to send (CTS-to-self) frames to AP in the same time period. During the uplink measurement process, the initiating device such as AP sends perception measurement trigger frames to responding devices 1, 2, and 3 in the same time period, and receives feedback measurement frames (such as NDP) from the responding devices. During the downlink measurement process, the initiating device such as AP sends perception measurement declaration frames to responding devices 1, 2, and 3 in the same time period, and the initiating device such as AP sends measurement frames to responding devices 1, 2, and 3 in the same time period. Among them, the CTS-to-self frame is a frame format defined in the relevant standards, which is used here to respond to the perception polling trigger frame.

[0090] like Figure 7c As shown, the process of the perception reporting phase based on the trigger frame may include: in the reporting preparation process, the initiating device such as AP may send a perception feedback request frame to multiple responding devices such as responding devices 1, 2, and 3, which are STA1, STA2, and STA3 respectively. STA1, STA2, and STA3 send perception feedback response frames to AP in the same time period. In the reporting process, the initiating device such as AP sends a perception measurement reporting trigger frame to responding devices 1 and 2 in the first time period, and responding devices 1 and 2 feed back the perception measurement reporting frame to the initiating device in the same time period; the initiating device such as AP sends a perception measurement reporting trigger frame to responding device 3 in the second time period, and responding device 3 feeds back the perception measurement reporting frame to the initiating device.

[0091] With respect to the perception measurement method based on trigger frames in the fifth and sixth points above, a specific frame format for information interaction may be provided based on the embodiments of the present application.

[0092] Figure 8 is a schematic flow chart of a communication method 800 according to an embodiment of the present application. The method may optionally be applied to Figure 1 The system shown in the figure is not limited thereto. The method includes at least part of the following contents.

[0093] S810. A communications device sends and / or receives a trigger frame that carries information related to sensing measurements.

[0094] In a possible implementation, the communication device may be a first device. The first device may send a trigger frame carrying information related to the perception measurement. For example, the first device may send a trigger frame carrying information related to the perception measurement to the second device. The first device may include an access point site (AP for short).

[0095] In a possible implementation, the communication device may be a second device. The second device may receive a trigger frame carrying information related to the perception measurement. For example, the second device may receive a trigger frame carrying information related to the perception measurement from the first device. The second device may include a non-access point station (hereinafter referred to as STA).

[0096] In a possible implementation, the perception measurement related information includes a field for indicating trigger frame type related common information. For example, the field for indicating trigger frame type related common information can be expressed as trigger frame type related common information (Trigger Dependent Common Info), which is used to indicate information applicable to each user in the user information list.

[0097] In a possible implementation, the field for indicating the general information related to the trigger frame type includes a field for indicating a sensing trigger frame subtype. For example, the field for indicating a sensing trigger frame subtype may be expressed as a sensing trigger frame subtype (Sensing Subtype).

[0098] In a possible implementation, the value of the field for indicating the perception trigger frame subtype is a first value, indicating that the trigger frame carrying the perception measurement related information is a perception measurement polling trigger frame. For example, the value of the field for indicating the perception trigger frame subtype is 0, which can indicate that the trigger frame is a perception polling trigger frame (Poll SensingMeasurement Trigger Frame). The value of 0 in this field is only an example, and any value from 0 to 15 or other values ​​can also be used to indicate that the trigger frame is a perception polling trigger frame.

[0099] In an embodiment of the present application, a perception measurement polling trigger frame can be used in a perception measurement phase based on a trigger frame. A first device, such as an AP, sends a perception measurement polling trigger frame before sending a perception measurement trigger frame or a perception declaration frame, and can count the number of STAs participating in this perception measurement instance and their device identifiers. The STAs participating in this perception measurement instance will reply a CTS-to-self frame to the AP according to the corresponding resource allocation information in the perception measurement polling trigger frame, and the STAs not participating in this perception measurement instance will not reply a CTS-to-self frame to the AP according to the corresponding resource allocation information in the perception measurement polling trigger frame.

[0100] In a possible implementation, the perception measurement polling trigger frame is used to trigger the transmission of an uplink extremely high throughput (EHT) trigger frame (TB) physical layer protocol unit (PPDU). For example, when the perception measurement polling trigger frame is used to trigger the transmission of an uplink EHT TB PPDU, the 54th bit and the 55th bit of the EHT variant general information field of the frame can be set to 0.

[0101] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the EHT variant general information field of the perception measurement polling trigger frame.

[0102] In a possible implementation, the perception measurement polling trigger frame is used to trigger the transmission of an uplink high efficiency (HE) TB PPDU. For example, when the perception measurement polling trigger frame is used to trigger the transmission of an uplink HE TB PPDU, the 54th bit and the 55th bit of the HE variant general information field of the frame may be set to 1.

[0103] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the HE variant general information field of the perception measurement polling trigger frame.

[0104] In a possible implementation manner, the value of the field for indicating the perception trigger frame subtype is a second value, indicating that the trigger frame carrying the perception measurement related information is a perception measurement trigger frame.

[0105] In the disclosed embodiment, the perception measurement trigger frame can be used in the perception measurement phase based on the trigger frame. The first device, such as an AP, can send the perception measurement trigger frame to the second device, such as a STA, to trigger the STA to send a perception measurement frame based on the trigger frame (e.g., TB Sensing NDP). The AP then receives the TB Sensing NDP returned by the STA to complete the channel measurement. The STA in this example can be the target STA of the perception measurement polling trigger frame sent by the AP, and reply with a CTS-to-self frame to confirm the STA participating in this perception measurement instance.

[0106] In a possible implementation, the sensing measurement trigger frame is used to trigger the transmission of an uplink EHT TB sensing measurement frame. For example, the EHT TB sensing measurement frame may be an EHT TB sensing null data packet (EHT TB Sensing NDP). When the sensing measurement trigger frame is used to trigger the transmission of an uplink EHT TB Sensing NDP, the 54th bit and the 55th bit of the EHT variant general information field of the frame may be set to 0.

[0107] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the EHT variant general information field of the perception measurement trigger frame.

[0108] In a possible implementation manner, the field for indicating general information related to the trigger frame type further includes: a field for indicating the number of repetitions of an EHT-LTF (Long Training Field).

[0109] In a possible implementation, the field for indicating the number of EHT-LTF repetitions is used to indicate the number of repetitions of the EHT-LTF in the EHT TB perception measurement frame triggered by the perception measurement trigger frame. For example, the number of repetitions of the EHT-LTF carried in the perception measurement trigger frame sent by the first device to the second device can trigger the second device to send an EHT TB perception measurement frame determined based on the number of repetitions of the EHT-LTF to the first device.

[0110] In a possible implementation, at least one of the following in the EHT variant general information field in the perception measurement trigger frame becomes a reserved field and / or is set to a third value: a low density parity check code (LDPC) additional symbol segment field, a forward error correction code (FEC) pre-fill factor field, and a PE disambiguation field. For example, the LDPC additional symbol segment field, the FEC pre-fill factor field, and the packet extension (PE) disambiguation field are changed into reserved fields and set to 0. The third value of 0 is only an example and not a limitation, and the third value may also be other values.

[0111] In a possible implementation, at least one of the following in the EHT variant user information field in the perception measurement trigger frame becomes a reserved field and / or is set to a fourth value: an uplink forward error correction coding scheme field, an uplink EHT modulation and coding strategy field. For example, the uplink forward error correction coding scheme field and the uplink EHT modulation and coding strategy field are changed into reserved fields and set to 0. The fourth value of 0 is only an example and not a limitation, and the fourth value may also be other values.

[0112] In a possible implementation, the sensing measurement trigger frame is used to trigger the transmission of an uplink HE TB sensing measurement frame. For example, the HE TB sensing measurement frame may be an HE TB sensing null data packet (HE TB Sensing NDP). When the sensing measurement trigger frame is used to trigger the transmission of an uplink HE TB Sensing NDP, the 54th bit and the 55th bit of the HE variant general information field of the frame may be set to 1.

[0113] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the HE variant general information field of the perception measurement trigger frame.

[0114] In a possible implementation, the field for indicating general information related to the trigger frame type also includes: a field for indicating the number of HE-LTF repetitions.

[0115] In a possible implementation, the field for indicating the number of HE-LTF repetitions is used to indicate the number of HE-LTF repetitions in the HE TB perception measurement frame triggered by the perception measurement trigger frame. For example, the perception measurement trigger frame sent by the first device to the second device carries the number of repetitions of the HE-LTF, which can trigger the second device to send a HE TB perception measurement frame determined based on the number of repetitions of the HE-LTF to the first device.

[0116] In a possible implementation, at least one of the following in the HE variant general information field in the perception measurement trigger frame becomes a reserved field and / or is set to a fifth value: LDPC additional symbol segment field, FEC pre-fill factor field, PE disambiguation field, Doppler field, uplink space-time block coding field, MU-MIMO HE-LTF mode field. For example, the LDPC additional symbol segment field, the FEC pre-fill factor field, the PE disambiguation field, the Doppler field, the uplink space-time block coding field, and the MU-MIMO HE-LTF mode field are turned into reserved fields and set to 0. The fifth value of 0 is only an example and not a limitation, and the fifth value may also be other values.

[0117] In a possible implementation manner, at least one of the following in the HE variant user information field in the perception measurement trigger frame becomes a reserved field and / or is set to a sixth value: an uplink forward error correction coding scheme field, an uplink HE modulation and coding strategy field, and an uplink dual carrier modulation field. For example, the uplink forward error correction coding scheme field, the uplink HE modulation and coding strategy field, and the uplink dual carrier modulation field are changed into reserved fields and set to 0. The sixth value of 0 is only an example and not a limitation, and the sixth value may also be other values.

[0118] In a possible implementation manner, the field for indicating general information related to the trigger frame type further includes at least one of the following:

[0119] A field for indicating the perception measurement setting identifier;

[0120] A field for indicating the identity of a perception measurement instance;

[0121] Reserved fields.

[0122] For example, in a perception measurement polling trigger frame used to trigger transmission of an uplink EHT TB PPDU, the EHT variant general information field includes the field for indicating general information related to the trigger frame type. The field for indicating general information related to the trigger frame type includes a field for indicating a perception trigger frame subtype, a field for indicating a perception measurement setting identifier, a field for indicating a perception measurement instance identifier, and a reserved field.

[0123] For another example, in a perception measurement polling trigger frame used to trigger transmission of an uplink HE TB PPDU, the HE variant general information field includes the field for indicating general information related to the trigger frame type. The field for indicating general information related to the trigger frame type includes a field for indicating a perception trigger frame subtype, a field for indicating a perception measurement setting identifier, a field for indicating a perception measurement instance identifier, and a reserved field.

[0124] For example, in a perception measurement trigger frame used to trigger the transmission of an uplink EHT TB perception measurement frame, the EHT variant general information field includes the field for indicating general information related to the trigger frame type. The field for indicating general information related to the trigger frame type includes a field for indicating a perception trigger frame subtype, a field for indicating a perception measurement setting identifier, a field for indicating a perception measurement instance identifier, an EHT-LTF repetition count, and a reserved field.

[0125] For another example, in a perception measurement trigger frame used to trigger transmission of an uplink HE TB perception measurement frame, the HE variant general information field includes the field for indicating general information related to the trigger frame type. The field for indicating general information related to the trigger frame type includes a field for indicating a perception trigger frame subtype, a field for indicating a perception measurement setting identifier, a field for indicating a perception measurement instance identifier, a HE-LTF repetition count, and a reserved field.

[0126] In a possible implementation manner, the field used to indicate a perception measurement setting identifier is used to identify a measurement parameter setting to be used in the perception measurement instance.

[0127] In a possible implementation manner, the field used to indicate the perception measurement instance identifier increases 1 by 1 from 0 to 255, and then starts from 0 after reaching 255.

[0128] In the above-mentioned embodiments of the present application, the frame formats of various perception measurement polling trigger frames in the perception measurement phase are modified to better support perception measurement.

[0129] In the above-mentioned embodiments of the present application, the frame formats of various perception measurement trigger frames in the perception measurement phase are modified to better support perception measurement.

[0130] Fig. 9 is a schematic flow chart of a communication method 900 according to an embodiment of the present application. The method may optionally be applied to Figure 1 The system shown in the figure is not limited thereto. The method includes at least part of the following contents.

[0131] S910: A communications device sends and / or receives a perception measurement frame based on a trigger frame.

[0132] In a possible implementation, the communication device may be a first device. The first device may receive a perception measurement frame based on a trigger frame. For example, the first device may receive a perception measurement frame based on a trigger frame from a second device. The first device may include an access point station (AP for short).

[0133] In a possible implementation, the communication device may be a second device. The second device may send a perception measurement frame based on a trigger frame. For example, the second device may send a perception measurement frame based on a trigger frame to the first device. The second device may include a non-access point station (hereinafter referred to as STA).

[0134] In a possible implementation manner, the trigger frame-based sensing measurement frame is used for uplink concurrent channel estimation.

[0135] In an embodiment of the present application, a trigger-frame-based sensing measurement frame (TB Sensing NDP) is used in a trigger-frame-based sensing measurement phase, and its function is to implement uplink concurrent channel estimation. A first device, such as an AP, can simultaneously sense the states of channels with multiple STAs by sending a trigger-frame-based sensing measurement frame. The STA in this example can be the target STA of the sensing measurement trigger frame sent by the AP.

[0136] In a possible implementation, the trigger frame-based perception measurement frame is an EHT TB perception measurement frame, and the EHT TB perception measurement frame is used for EHT STA. For example, the first device sends a perception measurement trigger frame to the second device to trigger the transmission of an uplink EHT TB perception measurement frame. The second device sends the EHT TB perception measurement frame to the first device based on the triggering of the perception measurement trigger frame.

[0137] In a possible implementation, the EHT TB perception measurement frame adopts the format of the EHT TB PPDU that does not include a data field. For example, the EHT TB perception measurement frame includes at least one of the following fields: L (Legacy)-STF (Short Training Field), L-LTF (Legacy Long Training Field), L-SIG (SIGnaling), RL (Repeated Legacy)-SIG, U (Universal)-SIG, EHT-STF, PE (Packet Extension Field), etc. Examples of the duration of the above fields may include: the duration of L-STF is 8μs, the duration of L-LTF is 8μs, the duration of L-SIG is 4μs, the duration of RL-SIG is 4μs, the duration of U-SIG is 8μs, the duration of EHT-STF depends on the size of the guard interval (Guard Interval, GI) and LTE, and the duration of PE is 4μs.

[0138] In a possible implementation manner, the waveform generated by the EHT TB perception measurement frame cannot use beamforming. For example, indication information may be used to indicate that the waveform generated by the EHT TB perception measurement frame cannot use beamforming.

[0139] In a possible implementation, the EHT-STF field in the EHT TB awareness measurement frame is the same as the EHT-STF field in the EHT TB PPDU.

[0140] In a possible implementation manner, the duration of the packet extension field in the EHT TB perception measurement frame is 4 μs.

[0141] In a possible implementation manner, the spatial mapping matrix used for transmission of the EHT-LTF of the EHT TB perception measurement frame is determined by at least one of the following methods:

[0142] When the number of spatial streams (NSS) is equal to the number of transmit chains (NTx), the spatial mapping matrix is ​​the identity matrix;

[0143] When NSS is less than NTx, the spatial mapping matrix is ​​an antenna selection matrix without antenna exchange;

[0144] When all zero rows are deleted, the spatial mapping matrix is ​​the identity matrix.

[0145] In a possible implementation manner, the EHT-LTF in the EHT TB perception measurement frame supports at least one of the following types:

[0146] 2×EHT-LTF+0.8μs GI;

[0147] 2×EHT-LTF+1.6μs GI;

[0148] 4×EHT-LTF+3.2μs GI.

[0149] Here, μs represents microseconds, and GI represents a guard interval.

[0150] In a possible implementation, the EHT-LTF field may be a deterministic signal that provides a method for a receiver to estimate a MIMO channel between a constellation mapper output and a receiving chain.

[0151] For example, the EHT-LTF field may include the following types: 1×EHT-LTF, 2×EHT-LTF, 4×EHT-LTF.

[0152] In the time domain, the duration of 1×EHT-LTF may be 3.2 μs, the duration of 2×EHT-LTF may be 6.4 μs, and the duration of 4×EHT-LTF may be 12.8 μs.

[0153] In the frequency domain, an example of the subcarrier coefficient of 1×EHT-LTF is as follows (taking 20 MHz bandwidth as an example):

[0154] EHT-LTF(20MHz)=0,0,1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,+1,0,0,0,1,0, 0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,+ 1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0 ,1,0,0,0,0,0,0,0,1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0, 0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0

[0155] An example of subcarrier coefficients for 2×EHT-LTF is as follows:

[0156] EHT-LTF(20MHz)=1,0,1,0,1,0,+1,0,+1,0,1,0,+1,0,1,0,1,0,1,0,1,0,+1,0,1,0 ,+1,0,1,0,1,0,+1,0,+1,0,1,0,+1,0,+1,0,+1,0,+1,0,+1,0,1,0,+1,0,1,0,+1,0 ,1,0,1,0,+1,0,+1,0,1,0,+1,0,1,0,1,0,1,0,1,0,+1,0,1,0,+1,0,1,0,+1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,+1,0,+1,0,1,0,1,0 ,+1,0,0,0,+1,0,1,0,+1,0,+1,0,1,0,+1,0,+1,0,1,0,+1,0,+1,0,1,0,1,0,+1,0,1,0,+1,0,1,0,+1,0,+1,0,+1,0,+1,0,1,0,+1,0,1,0,+1,0,1,0,+1,0,1,0,1,0,1,0,1, 0,1,0,1,0,+1,0,1,0,+1,0,1,0,1,0,+1,0,+1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,+1,0,1,0,+1,0,+1,0,1,0,1,0,+1,0,+1,0,1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,+1.

[0157] An example of subcarrier coefficients for 4×EHT-LTF is as follows:

[0158] EHT-LTF(20MHz)=1,1,+1,1,+1,1,+1,+1,+1,1,+1,+1,+1,1,1,+1,1,1,1,1,1,+1,+1,1,1,1 ,1,+1,+1,1,+1,1,+1,+1,+1,+1,1,+1,1,1,+1,+1,1,+1,+1,+1,+1,1,1,+1,1,1,1,+1,+1,+ 1,+1,1,+1,1,1,1,1,+1,1,1,+1,1,1,+1,1,1,1,+1,1,1,1,1,+1,1,1,1,1,1,+1,+1,1,1,1,1,1,+1,+1,1,1,1,1,+1,+1,+1,1,+1,+1,1,+1,1,1,1,1,1,+1,+1,+1,1,1,1,1,1,+1,+1,1,1,1,1,+1,+1,1,1,1,1,+1,1,1,1,1,+1,1,1,1,1,+1 ,+1,0,0,0,1,+1,1,+1,1,+1,+1,1,+1,+1,1,1,+1,1,1,+1,1,+1,1,+1,1,+1,+1,+1,1,+1,+1,1,1,1,1,+1,+1,1,1,1,1,1,+1,+1,1,1,1,1,1,+1,1,+1,1,1,1,1,1,+1,1,+1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ,1,+1,+1,1,+1,+1,+1,+1,+1,+1,+1,1,+1,+1,1,1,1,1,+1,+1,+1,1,1,1,+1,+1,+1,1,1,1,+1,+1,+1,+1,1,1,1,+1,+1,+1,+1,+1,1,1,+1,+1,+1,1,1,+1,+1,1,1,1,+1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1

[0159] GI represents the guard interval between Orthogonal Frequency Division Multiplexing (OFDM) symbols, and examples of values ​​may include: 0.8μs, 1.6μs, and 3.2μs.

[0160] In a possible implementation manner, among the types of EHT-LTF, 2×EHT-LTF+0.8μs GI and 2×EHT-LTF+1.6μs GI may be mandatory, and 4×EHT-LTF+3.2μs GI may be optional.

[0161] In a possible implementation, the number of EHT-LTF symbols in the EHT TB perception measurement frame is the product of the normal number of EHT-LTF symbols and the number of EHT-LTF repetitions. For example, the normal number of EHT-LTF symbols may be 1, 2, 4, 6, 8, etc.

[0162] In a possible implementation, the number of repetitions of the EHT-LTF is carried by a perception measurement trigger frame, and the perception measurement trigger frame is used to trigger the EHT TB perception measurement frame. For example, the first device sends a perception measurement trigger frame carrying the number of repetitions of the EHT-LTF to the second device. In this way, the second device can be triggered to send an EHT TB perception measurement frame determined based on the number of repetitions of the EHT-LTF to the first device. The frame format of the perception measurement trigger frame can refer to the relevant description in the above-mentioned embodiment of the perception measurement trigger frame.

[0163] In a possible implementation, the perception measurement frame based on the trigger frame is a HE TB perception measurement frame, and the HE TB perception measurement frame is used for HE STA. For example, the first device sends a perception measurement trigger frame to the second device to trigger the transmission of an uplink HE TB perception measurement frame. The second device sends the HE TB perception measurement frame to the first device based on the triggering of the perception measurement trigger frame.

[0164] In a possible implementation, the HE TB perception measurement frame adopts the format of the HE TB PPDU that does not include a data field. For example, the HE TB perception measurement frame includes at least one of the following fields: L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-STF, HE-LTF, PE (packet extension field), etc. Examples of the duration of the above fields may include: the duration of L-STF is 8μs, the duration of L-LTF is 8μs, the duration of L-SIG is 4μs, the duration of RL-SIG is 4μs, the duration of HE-SIG-A is 8μs, there may be multiple HE-STFs and the duration of each HE-STF is 8μs, the duration of HE-LTF is 8μs, and the duration of PE is 4μs.

[0165] In a possible implementation manner, the waveform generated by the HE TB perception measurement frame cannot use beamforming. For example, indication information may be used to indicate that the waveform generated by the HE TB perception measurement frame cannot use beamforming.

[0166] In one possible implementation, the HE-STF field in the HE TB perception measurement frame is the same as the HE-STF field in the HE TB PPDU.

[0167] In a possible implementation manner, the duration of the packet extension field in the HE TB perception measurement frame is 4 μs.

[0168] In a possible implementation manner, the spatial mapping matrix used for transmission of the HE-LTF of the HE TB perception measurement frame is determined by at least one of the following methods:

[0169] When the number of transmitted spatial streams NSS is equal to the number of transmitted transmission chains NTx, the spatial mapping matrix is ​​the identity matrix;

[0170] When NSS is less than NTx, the spatial mapping matrix is ​​an antenna selection matrix without antenna exchange;

[0171] When all zero rows are deleted, the spatial mapping matrix is ​​the identity matrix.

[0172] In a possible implementation manner, the type of HE-LTF supported in the HE TB perception measurement frame is: 2×HE-LTF+1.6μs GI, where μs represents microseconds and GI represents a guard interval.

[0173] In one possible implementation, the HE-LTF field may be a deterministic signal that provides a method for the receiver to estimate the MIMO channel between the constellation mapper output and the receive chain.

[0174] For example, the HE-LTF field may include the following types: 1×HE-LTF, 2×HE-LTF, 4×HE-LTF.

[0175] In the time domain, the duration of 1×HE-LTF can be 3.2μs, the duration of 2×HE-LTF can be 6.4μs, and the duration of 4×HE-LTF can be 12.8μs.

[0176] In the frequency domain, an example of the subcarrier coefficient of 1×HE-LTF is as follows (taking 20 MHz bandwidth as an example):

[0177] HE-LTF(20MHz)=0,0,1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0 ,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,+1 ,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0 ,1,0,0,0,0,0,0,0,1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0, 0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,+1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0

[0178] An example of subcarrier coefficients for 2×HE-LTF is as follows:

[0179] HE-LTF(20MHz)=1,0,1,0,1,0,+1,0,+1,0,1,0,+1,0,1,0,1,0,1,0,1,0,+1,0,1,0, +1,0,1,0,1,0,+1,0,+1,0,1,0,+1,0,+1,0,+1,0,+1,0,+1,0,1,0,+1,0,1,0,+1,0, 1,0,1,0,+1,0,+1,0,1,0,+1,0,1,0,1,0,1,0,1,0,+1,0,1,0,+1,0,+1,0,+1,0,1,0,1,0,+1,0,1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,+1,0,+1,0,1,0,1,0, +1,0,0,0,+1,0,1,0,+1,0,+1,0,1,0,+1,0,+1,0,1,0,+1,0,+1,0,1,0,1,0,+1,0,1,0,+1,0,1,0,+1,0,+1,0,+1,0,1,0,+1,0,1,0,+1,0,1,0,+1,0,1,0,1,0,+1,0,1,0,1,0,1,0,1,0 ,1,0,1,0,+1,0,1,0,+1,0,1,0,1,0,+1,0,+1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,+1,0,1,0,+1,0,1,0,+1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,1,0,+1,0,1,0,1,0,+1.

[0180] An example of subcarrier coefficients for 4×HE-LTF is as follows:

[0181] HE-LTF(20MHz)=1,1,+1,1,+1,1,+1,+1,+1,1,+1,+1,+1,1,1,+1,1,1,1,1,1,+1,+1,1,1,1, 1,+1,+1,1,+1,1,+1,+1,+1,+1,1,+1,1,1,+1,+1,1,+1,+1,+1,+1,1,1,+1,1,1,1,+1,+1,+1 ,+1,1,+1,1,1,1,1,+1,1,1,+1,1,1,+1,1,1,1,1,+1,1,1,1,1,+1,1,1,1,1,1,+1,1,1,1,1,1,+1,+1,1,1,1,1,+1,+1,1,1,+1,+1,1,+1,1,+1,1,1,1,1,+ ... ,+1,0,0,0,1,+1,1,+1,1,+1,+1,1,+1,+1,1,1,+1,1,1,+1,1,+1,1,+1,1,+1,+1,+1,1,+1,+1,1,1,1,1,+1,+1,1,1,1,1,1,+1,+1,1,1,1,1,1,+1,1,+1,1,1,1,1,1,+1,1,+1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ,1,+1,+1,1,+1,+1,+1,+1,+1,+1,+1,1,+1,+1,1,1,1,1,+1,+1,+1,1,1,1,+1,+1,+1,1,1,1,+1,+1,+1,+1,1,1,1,+1,+1,+1,+1,+1,1,1,+1,+1,+1,1,1,+1,+1,1,1,1,+1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1,1,1,+1

[0182] GI represents the guard interval between OFDM symbols, and examples of values ​​may include: 0.8μs, 1.6μs, and 3.2μs.

[0183] In one possible implementation, the number of HE-LTF symbols in the HE TB perception measurement frame is the product of the normal number of HE-LTF symbols and the number of HE-LTF repetitions. For example, the normal number of HE-LTF symbols may be 1, 2, 4, 6, 8, etc.

[0184] In a possible implementation, the number of HE-LTF repetitions is carried by a perception measurement trigger frame, and the perception measurement trigger frame is used to trigger the HE TB perception measurement frame. For example, the first device sends a perception measurement trigger frame carrying the number of HE-LTF repetitions to the second device. In this way, the second device can be triggered to send a HE TB perception measurement frame determined based on the number of repetitions of the HE-LTF to the first device. The frame format of the perception measurement trigger frame can refer to the relevant description in the above-mentioned embodiment of the perception measurement trigger frame.

[0185] In a possible implementation, the method of this embodiment may be used in combination with the method 800 of the above embodiment. The trigger frame carrying the perception measurement related information in the above method 800 is used for triggering, and the perception measurement is performed using the perception measurement frame based on the trigger frame of this embodiment. For example, after a first device such as an AP sends a perception measurement polling trigger frame using at least one frame format in the above method 800 to a second device such as a STA, the second device sends a CTS-to-self to the first device. Then, after the first device such as an AP sends a perception measurement trigger frame using at least one frame format in the above method 800 to a second device such as a STA, the second device sends a perception measurement frame based on the trigger frame using at least one frame format in the above method 800 to the first device.

[0186] The above-mentioned embodiments of the present application provide a variety of frame formats of perception measurement frames in the perception measurement phase, which can better support perception measurement.

[0187] See also Figure 3 The overall process of WIFI sensing includes discovery, setting, measurement, reporting and termination stages, and the frame format provided in the embodiment of the present application mainly relates to the measurement stage. The following describes an example of the frame format provided in the embodiment of the present application.

[0188] In the perception measurement phase, at least one of the following frame formats may be provided: a perception measurement polling trigger frame, a perception measurement trigger frame, and a perception measurement frame based on a trigger frame. The contents of these three frame formats are described in detail below.

[0189] 1. Perception measurement polling trigger frame

[0190] The perception measurement polling trigger frame is used in the perception measurement phase based on the trigger frame. Its function is to count the number of STAs participating in this perception measurement instance and their device identifications before the AP sends the perception measurement trigger frame or the perception declaration frame. The STAs participating in this perception measurement instance will reply CTS-to-self frames to the AP according to the corresponding resource allocation information in the perception measurement polling trigger frame. The STAs not participating in this perception measurement instance will not reply CTS-to-self frames to the AP according to the corresponding resource allocation information in the perception measurement polling trigger frame.

[0191] The reason why polling is performed before the start of a perception measurement instance is that as time changes, the STA that participated in the previous perception measurement instance may leave the coverage of the AP or be busy with other communication tasks during the next perception measurement, resulting in failure to participate in this perception measurement instance.

[0192] The Perception Measurement Polling Trigger frame can be used to trigger the transmission of an uplink EHT TB PPDU or an uplink HE TB PPDU. When the Perception Measurement Polling Trigger frame is used to trigger the transmission of an uplink EHT TB PPDU, the 54th and 55th bits of the General Information field are set to 0. When the Perception Measurement Polling Trigger frame is used to trigger the transmission of an uplink HE TB PPDU, the 54th and 55th bits of the General Information field are set to 1.

[0193] When the perception measurement polling trigger frame is used to trigger the transmission of the uplink EHT TB PPDU, the perception measurement polling trigger frame includes the EHT variant general information field and the EHT variant user information field. When the perception measurement polling trigger frame is used to trigger the transmission of the uplink HE TB PPDU, the perception measurement polling trigger frame includes the HE variant general information field and the HE variant user information field.

[0194] 1.1 Perception Measurement Polling Trigger Frame for Triggering Transmission of Uplink EHT TB PPDU

[0195] like Fig.10 As shown, a sensing polling trigger frame (Sensing Poll Trigger frame) for triggering the transmission of an uplink EHT TB PPDU is provided. This is a new trigger frame. Among them:

[0196] Frame Type: A value of 1 indicates that the frame is a control frame.

[0197] Frame subtype (Subtype): A value of 2 indicates that the frame is a trigger frame.

[0198] EHT variant Common Info: information applicable to the STA identified by each user information in the user information list.

[0199] The following describes the various fields included in the EHT variant general information:

[0200] Trigger frame type (Trigger Type): A value of 9 indicates that the frame is a perception trigger frame (any one of the reserved values ​​9 to 15 can be used to indicate that the frame is a perception trigger frame).

[0201] Uplink length (UL Length): indicates the value of the L-SIGLEHGTH field in the uplink EHT TB PPDU triggered by the trigger frame.

[0202] Whether there are more trigger frames (More TF): Indicates whether there are other trigger frames to be sent after the trigger frame is sent. The value is 1 for yes, 0 for no, or 0 for yes and 1 for no.

[0203] Whether carrier sensing is required (CS Required): Indicates that the STA identified in the user information field needs to use energy detection (ED) to sense the medium and consider the medium status and network allocation vector (NAV) to decide whether to respond. The value is 1 for yes, 0 for no, or 0 for yes and 1 for no.

[0204] Uplink bandwidth (UL BW): This field and the uplink bandwidth extension (UL BWExtension) subfield in the "Special User Information" field together indicate the bandwidth used by the EHT TB PPDU. For examples of specific values ​​and their meanings, see Table 1.

[0205] Table 1 - Coding meaning of the uplink bandwidth field and uplink bandwidth extension subfield

[0206]

[0207]

[0208] GI and EHT-LTF Type (GI And EHT-LTF Type): indicates the type of the guard interval (GI) and EHT-LTF (Long Training Field) used by the uplink EHT TBPPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 2.

[0209] Table 2 - Meaning of the guard interval and EHT-LTF type fields

[0210] Value Guard interval and EHT-LTF type 0 1×EHT-LTF+1.6μs GI 1 2×EHT-LTF+1.6μs GI 2 4×EHT-LTF+3.2μs GI 3 reserve

[0211] Number of EHT-LTF Symbols: indicates the number of EHT-LTF symbols used by the uplink EHT TB PPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 3.

[0212] Table 3 - Meaning of the EHT-LTF symbol number field

[0213] Value Number of EHT-LTF symbols 0 1EHT-LTF 1 2EHT-LTF 2 4EHT-LTF 3 6EHT-LTF 4 8EHT-LTF 5-7 reserve

[0214] LDPC Extra Symbol Segment: Indicates the status of the Low-Density Parity Check Code (LDPC) Extra Symbol Segment. A value of 1 indicates that the LDPC Extra Symbol Segment exists in the uplink EHT TB PPDU triggered by the trigger frame, and a value of 0 indicates that the LDPC Extra Symbol Segment does not exist in the uplink EHT TB PPDU triggered by the trigger frame.

[0215] AP Tx Power: Indicates the AP combined transmit power of all antennas used to send trigger PPDUs on the transmit antenna connector, in dBm / 20MHz.

[0216] Pre-FEC Padding Factor: indicates the FEC pre-filling factor of the uplink EHTTB PPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 4.

[0217] Table 4-FEC prefill factor field meaning

[0218] Value FEC prefill factor 0 4 1 1 2 2 3 3

[0219] PE Disambiguity: indicates the PE disambiguation of the uplink EHT TB PPDU triggered by the trigger frame. If formula (1) is satisfied, the value of this field is 1. If formula (1) is not satisfied, the value of this field is 0.

[0220]

[0221] Among them, T PE is the length of the PE field, T SYM is the symbol length of the data field, TXTIME is the packet sending time, SignalExtension is 0; if NO_SIG_EXTN in vector (TXVECTOR) is true; SignalExtension is aSignalExtension; if NO_SIG_EXTN in TXVECTOR is false.

[0222] UL Spatial Reuse: indicates the value of the spatial reuse field of the HE-SIG-A field of the uplink EHT TB PPDU triggered by this trigger frame.

[0223] HE / EHT primary 160 MHz (HE / EHT P160): indicates whether the uplink TB PPDU triggered by the trigger frame is a HE TB PPDU or an EHT TB PPDU in the primary 160 MHz. The value 0 represents EHT TB PPDU, and the value 1 represents HE TB PPDU.

[0224] Special User Info Field Flag: Indicates whether the trigger frame contains a special user information field. A value of 0 indicates that it contains a special user information field, and a value of 1 indicates that it does not contain a special user information field. This field is always 0 in the EHT variant general information field, indicating that the trigger frame containing the EHT variant general information field contains a special user information field. When the perception measurement polling trigger frame is used to trigger the transmission of the uplink EHT TB PPDU, the 54th bit (HE / EHT P160 field) and the 55th bit (Special User Info Field Flag field) of the EHT variant general information field are both set to 0;

[0225] The perception trigger frame may also include a general information field related to the trigger frame type.

[0226] Trigger Dependent Common Info: indicates information applicable to each user in the user information list. For example, this field may include the following fields:

[0227] (1) Sensing Subtype: A value of 0 indicates that the frame is a Poll Sensing Measurement Trigger Frame (any value from 0 to 15 may be used). Other values ​​may also be used to indicate that the frame is a Poll Sensing Measurement Trigger Frame.

[0228] (2) Perception Measurement Setup ID field: indicates the measurement setup identifier, which identifies the measurement parameter settings to be used in this measurement instance.

[0229] (3) Perception Measurement Instance ID field: indicates the measurement instance ID, which increases by 1 from 0 to 255 and then starts from 0 again after reaching 255.

[0230] The trigger frame type related general information field may also include a reserved field.

[0231] The above are the fields of the EHT variant general information. The following introduces the user information list of the perception measurement trigger frame and the fields it includes.

[0232] User Info List: A collection of zero or more user information fields. For example, this field includes the following fields:

[0233] Special User Info: This field does not carry specific user information, but carries general information outside the EHT variant general information field.

[0234] Identity ID (AID12): The value is a fixed value 2007, which identifies the user information field as a special user information field.

[0235] PHY version identifier: indicates the PHY version of the TB PPDU triggered by this trigger frame (except HE TB PPDU). For examples of specific values ​​and their meanings, see Table 5.

[0236] Table 5 - Meaning of PHY version identifier fields

[0237] Value PHY version identifier 0 EHT 1-7 reserve

[0238] UL Bandwidth Extension: together with the Uplink Bandwidth field in the EHT Variant General Information field, indicates the bandwidth of the TB PPDU obtained by the EHT STA triggered by the trigger frame. For specific values ​​and their meanings, see Table 1.

[0239] EHT Spatial Reuse 1: carries the value of the Spatial Reuse 1 field in the U-SIG field in the EHT TB PPDU triggered by this trigger frame.

[0240] EHT Spatial Reuse 2: carries the value of the Spatial Reuse 2 field in the U-SIG field in the EHT TB PPDU triggered by this trigger frame.

[0241] U-SIG Disregard And Validate: Carries the values ​​of the Disregard and Validate fields in the U-SIG field in the EHT TB PPDU triggered by this trigger frame.

[0242] EHT variant User Info: carries information for a specific STA.

[0243] Identity (AID12 / UID12): terminal identifier.

[0244] Resource unit allocation (RU Allocation): resource unit allocation information for the terminal.

[0245] Uplink forward error correction coding scheme (UL FEC Coding Type): indicates the channel coding type used by the uplink EHT TB PPDU triggered by the trigger frame. A value of 0 indicates BCC coding, and a value of 1 indicates LDPC coding.

[0246] Uplink EHT modulation and coding strategy (UL EHT-MCS): indicates the modulation and coding strategy used by the uplink EHT TB PPDU triggered by the trigger frame.

[0247] SS Allocation: indicates the spatial stream allocation information used by the uplink EHT TB PPDU triggered by the trigger frame.

[0248] UL Target Receive Power: indicates the expected power of the average received signal of each antenna measured on the antenna connector of the AP for the uplink EHT TB PPDU triggered by the trigger frame.

[0249] Master / Slave 160MHz (PS160): In conjunction with the Resource Unit Allocation field, indicates the resource unit allocation scheme.

[0250] For the perception trigger frame, the special user information field or the EHT variant user information field does not include the trigger frame type related user information field (Trigger Dependent User Info field).

[0251] 1.2 Perception Measurement Polling Trigger Frame for Triggering Transmission of Uplink HE TB PPDU

[0252] like Fig.11 As shown, a sensing polling trigger frame (Sensing Poll Trigger frame) for triggering the transmission of an uplink HE TB PPDU is provided. This is a new trigger frame. Among them:

[0253] Frame Type: A value of 1 indicates that the frame is a control frame.

[0254] Frame subtype (Subtype): A value of 2 indicates that the frame is a trigger frame.

[0255] HE variant Common Info: information applicable to the STA identified by each user information in the user information list.

[0256] The following describes the various fields included in the HE variant general information:

[0257] Trigger frame type (Trigger Type): A value of 9 indicates that the frame is a perception trigger frame (any one of the reserved values ​​9 to 15 can be used to indicate that the frame is a perception trigger frame).

[0258] Uplink length (UL Length): indicates the value of the L-SIGLEHGTH field in the uplink HE TB PPDU triggered by the trigger frame.

[0259] Whether there are more trigger frames (More TF): Indicates whether there are other trigger frames to be sent after the trigger frame is sent. The value is 1 for yes, 0 for no, or 0 for yes and 1 for no.

[0260] Uplink bandwidth (UL BW): indicates the bandwidth used by the uplink HE TB PPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 6.

[0261] Table 6- Meaning of Uplink Bandwidth Field

[0262] Value Uplink bandwidth 0 20MHz 1 40MHz 2 80MHz 3 80+80MHz or 160MHz

[0263] GI and HE-LTF Type (GI And HE-LTF Type): Indicates the type of the guard interval (GI) and HE-LTF (Long Training Field) used by the uplink HE TBPPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 7.

[0264] Table 7 - Guard interval and HE-LTF type field meaning

[0265] Value Guard interval and HE-LTF type 0 1×HE-LTF+1.6μs GI 1 2×HE-LTF+1.6μs GI 2 4×HE-LTF+3.2μs GI 3 reserve

[0266] MU-MIMO HE-LTF mode: When the GI and HE-LTF fields indicate 2x HE-LTF + 1.6μs GI or 4x HE-LTF + 3.2μs GI, this field indicates the HE-LTF mode used by the HE TB PPDU that uses all bandwidth resources and is allocated to multiple non-AP STAs; otherwise, this field is used to indicate the single-stream pilot HE-LTF mode. For examples of specific values ​​and their meanings, see Table 8.

[0267] Table 8 - MU-MIMO HE-LTF mode field meaning

[0268]

[0269] Number of HE-LTF Symbols and MidamblePeriodicity: When the Doppler field is 0, this field indicates the number of HE-LTF symbols used by the uplink HE TB PPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 9.

[0270] Table 9 - Meaning of the number of HE-LTF symbols field

[0271] Value Number of HE-LTF symbols 0 1HE-LTF 1 2HE-LTF 2 4HE-LTF 3 6HE-LTF 4 8HE-LTF 5-7 reserve

[0272] When the Doppler field is 1, this field indicates the number of HE-LTF symbols and training sequence periods used by the uplink HE TB PPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 10.

[0273] Table 10 - Meaning of the number of HE-LTF symbols and training sequence cycles field

[0274] Value Number of HE-LTF symbols and training sequence cycles 0 1 HE-LTF and 10 symbol period 1 2 HE-LTF and 10-symbol period 2 4 HE-LTF and 10 symbol period 4 1 HE-LTF and 20 symbol period 5 2 HE-LTF and 20 symbol period 6 4 HE-LTF and 20 symbol period 3，7 reserve

[0275] Uplink space time block coding (UL STBC, Space Time Block Coding): Indicates whether the HE TB PPDU triggered by this trigger frame uses space time block coding. The value 1 indicates that it is used, and the value 0 indicates that it is not used.

[0276] LDPC Extra Symbol Segment: Indicates the status of the Low Density Parity Check (LDPC) extra symbol segment. A value of 1 indicates that there is an LDPC extra symbol segment in the uplink HE TB PPDU triggered by the trigger frame, and a value of 0 indicates that there is no LDPC extra symbol segment in the uplink HE TB PPDU triggered by the trigger frame.

[0277] AP Tx Power: Indicates the AP combined transmit power on the transmit antenna connector for all antennas used to send the trigger PPDU, in dBm / 20 MHz.

[0278] Pre-FEC Padding Factor: indicates the FEC pre-filling factor of the uplink EHTTB PPDU triggered by the trigger frame. For examples of specific values ​​and their meanings, see Table 11.

[0279] Table 11 - FEC prefill factor field meaning

[0280] Value FEC prefill factor 0 4 1 1 2 2 3 3

[0281] PE Disambiguity: indicates the PE disambiguation of the uplink HE TB PPDU triggered by the trigger frame. If formula (2) is satisfied, the value of this field is 1. If formula (2) is not satisfied, the value of this field is 0.

[0282]

[0283] Among them, T PE is the length of the PE field, T SYM is the symbol length of the data field, TXTIME is the packet sending time, SignalExtension is 0; if NO_SIG_EXTN in TXVECTOR is true; SignalExtension is aSignalExtension; if NO_SIG_EXTN in TXVECTOR is false.

[0284] Uplink spatial multiplexing (UL Spatial Reuse): indicates the value of the spatial multiplexing field of the HE-SIG-A field of the uplink HE TB PPDU triggered by this trigger frame.

[0285] Doppler: Indicates whether there is a training sequence in the HE TB PPDU triggered by the trigger frame. A value of 1 indicates that there is a training sequence, and a value of 0 indicates that there is no training sequence.

[0286] UL HE-SIG-A2 Reserved: Carries the value of the reserved field in the HE-SIG-A2 subfield in the HE TBPPDUs triggered by this trigger frame. The UL HE-SIG-A2 Reserved field is set to 1.

[0287] Trigger Dependent Common Info: indicates information applicable to each user in the user information list. For example, this field may include the following fields:

[0288] (1) Sensing Subtype: A value of 0 indicates that the frame is a Poll Sensing Measurement Trigger Frame (any value from 0 to 15 may be used). Other values ​​may also be used to indicate that the frame is a Poll Sensing Measurement Trigger Frame.

[0289] (2) Perception Measurement Setup ID field: indicates the measurement setup identifier, which identifies the measurement parameter settings to be used in this measurement instance.

[0290] (3) Perception measurement instance ID field: indicates the measurement instance ID, which increases by 1 from 0 to 255 and then starts from 0 again after reaching 255.

[0291] The trigger frame type-related general information field may also include a reserved field.

[0292] The above are the fields of the EHT variant general information. The following introduces the user information list of the perception measurement trigger frame and the fields it includes.

[0293] User Info List: A collection of zero or more user information fields. For example, this field includes the following fields:

[0294] HE variant User Info: carries information for a specific STA.

[0295] Resource unit allocation (RU Allocation): resource unit allocation information for the terminal.

[0296] Uplink forward error correction coding scheme (UL FEC Coding Type): indicates the channel coding type used by the uplink HETB PPDU triggered by this trigger frame. A value of 0 indicates BCC coding, and a value of 1 indicates LDPC coding.

[0297] Uplink HE modulation and coding strategy (UL HE-MCS): indicates the modulation and coding strategy used by the HE TB PPDU triggered by this trigger frame.

[0298] Uplink dual carrier modulation (UL DCM): indicates whether the HE TB PPDU triggered by this trigger frame uses dual carrier modulation. The value 1 represents use, and the value 0 represents not use.

[0299] Spatial stream allocation (SS Allocation): indicates the spatial stream allocation information used by the uplink HE TB PPDU triggered by the trigger frame.

[0300] UL Target Receive Power: indicates the expected power of the average received signal of each antenna measured on the antenna connector of the AP for the uplink HE TB PPDU triggered by the trigger frame.

[0301] 2. Perception measurement trigger frame

[0302] The sensing measurement trigger frame is used in the sensing measurement phase based on the trigger frame. Its function is to trigger the STA to send the sensing measurement frame based on the trigger frame (TB Sensing NDP), and then the AP receives the TB Sensing NDP to complete the channel measurement. The STA here can be the target STA of the sensing measurement polling trigger frame sent by the AP, and reply with a CTS-to-self frame to confirm the STA participating in this sensing measurement instance.

[0303] The sensing measurement trigger frame may be used to trigger the transmission of the uplink EHT TB Sensing NDP or the transmission of the uplink HE TBSensing NDP.

[0304] When the Perception Measurement Trigger frame is used to trigger the transmission of the uplink EHT TB Sensing NDP, the 54th and 55th bits of the General Information field are both set to 0. When the Perception Measurement Trigger frame is used to trigger the transmission of the uplink HE TB Sensing NDP, the 54th and 55th bits of the General Information field are both set to 1.

[0305] When the sensing measurement trigger frame is used to trigger the transmission of the uplink EHT TB Sensing NDP, the sensing measurement trigger frame includes the EHT variant general information field and the EHT variant user information field. When the sensing measurement trigger frame is used to trigger the transmission of the uplink HETB Sensing NDP, the sensing measurement trigger frame includes the HE variant general information field and the HE variant user information field.

[0306] 2.1 Perception Measurement Trigger Frame for Triggering Uplink EHT TB Sensing NDP Transmission

[0307] like Fig.12 As shown, a sensing measurement trigger frame (Sensing Measurement Trigger frame) for triggering the transmission of uplink EHT TB Sensing NDP is provided. This is a new trigger frame. Among them:

[0308] The EHT variant general information field may include a trigger frame type related general information field. The trigger frame type related general information field may include: a sensing trigger frame subtype (Sensing Subtype), a sensing measurement setting ID, a sensing measurement instance ID, an EHT-LTF repetition number, and at least one of a reserved field.

[0309] Sensing Subtype: A value of 1 indicates that the subtype of the sensing trigger frame is a sensing measurement trigger frame. Other values ​​may also be used to indicate that the subtype of the sensing trigger frame is a sensing measurement trigger frame.

[0310] Compared with the above-mentioned perception measurement polling trigger frame used to trigger the transmission of the uplink EHT TB PPDU in point 1.1, the three fields of LDPC additional symbol segment, FEC pre-fill factor, and PE disambiguation in the EHT variant common information field in the perception measurement trigger frame become reserved fields and are all set to 0. A new "EHT-LTF repetition count" field is added to the general information field related to the trigger frame type, indicating the number of repetitions of EHT-LTF in the EHT TBSensing NDP triggered by the perception measurement trigger frame.

[0311] Compared with the perception measurement polling trigger frame for triggering the transmission of the uplink EHT TB PPDU in point 1.1 above, the uplink forward error correction coding scheme and the uplink EHT modulation and coding strategy fields in the EHT variant user information (EHT variant User Info) field in the perception measurement trigger frame become reserved fields and are both set to 0.

[0312] For the values ​​and meanings of other fields, refer to the corresponding fields in the perception measurement polling trigger frame for triggering the transmission of the uplink EHT TB PPDU in point 1.1 above.

[0313] 2.2 Sensing Measurement Trigger Frame for Triggering Transmission of Uplink HE TB Sensing NDP

[0314] like Fig.13 As shown, a sensing measurement trigger frame (Sensing Measurement Trigger frame) for triggering the transmission of uplink HE TB Sensing NDP is provided. This is a new trigger frame. Among them:

[0315] The HE variant general information field may include a trigger frame type related general information field. The trigger frame type related general information field may include: a sensing trigger frame subtype (Sensing Subtype), a sensing measurement setting ID, a sensing measurement instance ID, a HE-LTF repetition number, and at least one of a reserved field.

[0316] Sensing Subtype: A value of 1 indicates that the subtype of the sensing trigger frame is a sensing measurement trigger frame. Other values ​​may also be used to indicate that the subtype of the sensing trigger frame is a sensing measurement trigger frame.

[0317] Compared with the sensing measurement polling trigger frame used to trigger the transmission of uplink HE TB PPDU in point 1.2 above, the six fields of LDPC additional symbol segment, FEC pre-fill factor, PE disambiguation, Doppler, uplink space-time block coding, and MU-MIMO HE-LTF mode in the HE variant common information (HE variant Common Info) field in the sensing measurement trigger frame become reserved fields and are all set to 0. A "HE-LTF repetition count" field is added to the general information field related to the trigger frame type to indicate the number of repetitions of HE-LTF in the HE TB Sensing NDP triggered by the sensing measurement trigger frame.

[0318] Compared with the perception measurement polling trigger frame used to trigger the transmission of the uplink HE TB PPDU in point 1.2 above, the three fields of uplink forward error correction coding scheme, uplink HE modulation coding strategy, and uplink dual carrier modulation in the HE variant user information (HE variant User Info) field in the perception measurement trigger frame become reserved fields and are all set to 0.

[0319] For the values ​​and meanings of other fields, refer to the corresponding fields in the perception measurement polling trigger frame for triggering the transmission of uplink HE TB PPDU in point 1.2 above.

[0320] 3. Perception measurement frame based on trigger frame

[0321] The trigger-based sensing measurement frame (TB Sensing NDP) is used in the trigger-based sensing measurement phase to implement uplink concurrent channel estimation. The AP can sense the status of channels with multiple STAs at the same time. The STA here can be the target STA of the sensing measurement trigger frame sent by the AP.

[0322] There are two variants of the sensing measurement frame, one is an EHT triggered frame based sensing measurement frame (eg, EHT TB Sensing NDP) applicable to EHT STA, and the other is a HE triggered frame based sensing measurement frame (eg, HE TB Sensing NDP) applicable to HE STA.

[0323] 3.1EHT TB Sensing NDP

[0324] The format of EHT TB Sensing NDP is as follows Fig.14As shown, it includes at least one of the following fields: L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, EHT-STF, PE (Packet Extension Field), etc. Examples of the durations of the above fields can include: the duration of L-STF is 8 μs, the duration of L-LTF is 8 μs, the duration of L-SIG is 4 μs, the duration of RL-SIG is 4 μs, the duration of U-SIG is 8 μs, the duration of EHT-STF depends on the size of GI and LTE, and the duration of PE is 4 μs.

[0325] The EHT TB Sensing NDP has the following characteristics:

[0326] The EHT TB Sensing NDP uses the format of the EHT TB PPDU but has no Data field.

[0327] The waveform generated by the EHT TB Sensing NDP cannot use beamforming.

[0328] The EHT-STF field in the EHT TB Sensing NDP is the same as the EHT-STF field in the EHT TB PPDU.

[0329] The duration of the Packet Extension (PE) field in the EHT TB Sensing NDP is 4 μs.

[0330] For the transmission of EHT-LTF, when the number of transmit spatial streams (NSS) = the number of transmit transmission chains (NTx), the spatial mapping matrix (Q matrix) is the identity matrix; when NSS < NTx, the Q matrix should be an antenna selection matrix without antenna swapping. When all all-zero rows are deleted, the Q matrix should become an identity matrix.

[0331] EHT-LTF supports 2×EHT-LTF + 0.8 μs GI and 2×EHT-LTF + 1.6 μs GI, and can support 4×EHT-LTF + 3.2 μs GI. Other types of EHT-LTF may not be allowed to appear.

[0332] In an EHT TB Sensing NDP, the number of EHT-LTF symbols is the product of the regular number of EHT-LTF symbols and the EHT-LTF repetition times. Among them, the EHT-LTF repetition times can be carried by the sensing measurement trigger frame in any of the above embodiments.

[0333] 3.2HE TB Sensing NDP

[0334] The format of the HE TB Sensing NDP is as follows Fig.15 shown, including at least one of the following fields: L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-STF, HE-LTF, PE, etc. Examples of the durations of the above fields may include: the duration of L-STF is 8 μs, the duration of L-LTF is 8 μs, the duration of L-SIG is 4 μs, the duration of RL-SIG is 4 μs, the duration of HE-SIG-A is 8 μs, there can be multiple HE-STFs and the duration of each HE-STF is 8 μs, the duration of HE-LTF is 8 μs, and the duration of PE is 4 μs.

[0335] The HE TB Sensing NDP has the following characteristics:

[0336] The HE TB Sensing NDP uses the format of the HE TB PPDU but has no Data field.

[0337] The waveform generated by the HE TB Sensing NDP cannot use beamforming.

[0338] The HE-STF field in the HE TB Sensing NDP is the same as the HE-STF field in the HE TB PPDU.

[0339] The duration of the Packet Extension (PE) field in the HE TB Sensing NDP is 4 μs.

[0340] For the transmission of HE-LTF, when the number of transmit spatial streams (NSS) = the number of transmit antennas (NTx), the spatial mapping matrix (Q matrix) is the identity matrix; when NSS < NTx, the Q matrix should be an antenna selection matrix without antenna swapping. When all all-zero rows are deleted, the Q matrix should become an identity matrix.

[0341] HE-LTF supports 2×HE-LTF + 1.6 μs GI, and other types of HE-LTF may not be allowed to appear.

[0342] In an HE TB Sensing NDP, the number of HE-LTF symbols is the product of the regular number of HE-LTF symbols and the HE-LTF repetition times. Among them, the HE-LTF repetition times can be carried by the sensing measurement trigger frame in any of the above embodiments.

[0343] The embodiment of the present application provides a new frame format for the perception measurement phase in WIFI perception. The following frame structures are required in the perception measurement phase of the specific perception measurement type based on the trigger frame: perception measurement polling trigger frame, perception measurement trigger frame and perception measurement frame based on the trigger frame. The perception measurement polling trigger frame can trigger the uplink EHT TB PPDU or HE TB PPDU. The perception measurement trigger frame can trigger the uplink EHT TB Sensing NDP or HE TB Sensing NDP. Using at least one of these three frame structures, most of the perception measurement tasks based on the trigger frame can be implemented.

[0344] Fig.16 1 is a schematic block diagram of a communication device 1600 according to an embodiment of the present application. The communication device 1600 may include:

[0345] The communication unit 1610 is configured to send and / or receive a trigger frame carrying information related to perception measurements.

[0346] In a possible implementation manner, the perception measurement related information includes a field for indicating general information related to a trigger frame type.

[0347] In a possible implementation, the field for indicating general information related to the trigger frame type includes a field for indicating a perception trigger frame subtype.

[0348] In a possible implementation manner, the value of the field for indicating the perception trigger frame subtype is a first value, indicating that the trigger frame is a perception measurement polling trigger frame.

[0349] In a possible implementation manner, the perception measurement polling trigger frame is used to trigger the transmission of an uplink extremely high throughput EHT TB physical layer protocol unit PPDU based on the trigger frame.

[0350] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the EHT variant general information field of the perception measurement polling trigger frame.

[0351] In a possible implementation, the perception measurement polling trigger frame is used to trigger the transmission of an uplink high-efficiency HE TBPPDU.

[0352] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the HE variant general information field of the perception measurement polling trigger frame.

[0353] In a possible implementation manner, the value of the field for indicating the perception trigger frame subtype is a second value, indicating that the trigger frame is a perception measurement trigger frame.

[0354] In a possible implementation manner, the perception measurement trigger frame is used to trigger transmission of an uplink EHT TB perception measurement frame.

[0355] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the EHT variant general information field of the perception measurement trigger frame.

[0356] In a possible implementation manner, the field for indicating general information related to the trigger frame type further includes: a field for indicating the number of repetitions of an extremely high throughput long training field EHT-LTF.

[0357] In a possible implementation manner, the field used to indicate the number of repetitions of the EHT-LTF is used to indicate the number of repetitions of the EHT-LTF in the EHT TB perception measurement frame triggered by the perception measurement trigger frame.

[0358] In a possible implementation, at least one of the following in the EHT variant general information field in the perception measurement trigger frame becomes a reserved field and / or is set to a third value: LDPC additional symbol segment field, FEC pre-fill factor field, PE disambiguation field.

[0359] In a possible implementation manner, at least one of the following in the EHT variant user information field in the perception measurement trigger frame becomes a reserved field and / or is set to a fourth value: an uplink forward error correction coding scheme field and an uplink EHT modulation and coding strategy field.

[0360] In a possible implementation manner, the perception measurement trigger frame is used to trigger the transmission of an uplink HE TB perception measurement frame.

[0361] In a possible implementation manner, the field used to indicate general information related to the trigger frame type is a field in the HE variant general information field of the perception measurement trigger frame.

[0362] In a possible implementation, the field for indicating general information related to the trigger frame type also includes: a field for indicating the number of HE-LTF repetitions.

[0363] In a possible implementation, the field used to indicate the number of HE-LTF repetitions is used to indicate the number of HE-LTF repetitions in the HE TB perception measurement frame triggered by the perception measurement trigger frame.

[0364] In a possible implementation, at least one of the following in the HE variant general information field in the perception measurement trigger frame becomes a reserved field and / or is set to a fifth value: LDPC additional symbol segment field, FEC pre-fill factor field, PE disambiguation field, Doppler field, uplink space-time block coding field, MU-MIMO HE-LTF mode field.

[0365] In a possible implementation manner, at least one of the following in the HE variant user information field in the perception measurement trigger frame becomes a reserved field and / or is set to a sixth value: an uplink forward error correction coding scheme field, an uplink HE modulation and coding strategy field, and an uplink dual carrier modulation field.

[0366] In a possible implementation manner, the field for indicating general information related to the trigger frame type further includes at least one of the following:

[0367] A field for indicating the perception measurement setting identifier;

[0368] A field for indicating the identity of a perception measurement instance;

[0369] Reserved fields.

[0370] In a possible implementation manner, the field used to indicate a perception measurement setting identifier is used to identify a measurement parameter setting to be used in the perception measurement instance.

[0371] In a possible implementation manner, the field used to indicate the perception measurement instance identifier increases 1 by 1 from 0 to 255, and then starts from 0 after reaching 255.

[0372] The communication device 1600 of the embodiment of the present application can implement the corresponding functions of the communication device in the aforementioned method 800 embodiment. The processes, functions, implementation methods and beneficial effects corresponding to the various modules (sub-modules, units or components, etc.) in the communication device 1600 can be found in the corresponding descriptions in the above-mentioned method embodiments, which will not be repeated here. It should be noted that the functions described by the various modules (sub-modules, units or components, etc.) in the communication device 1600 of the embodiment of the application can be implemented by different modules (sub-modules, units or components, etc.), or by the same module (sub-module, unit or component, etc.).

[0373] Fig.17 1 is a schematic block diagram of a communication device 1700 according to an embodiment of the present application. The communication device 1700 may include:

[0374] The communication unit 1710 is configured to send and / or receive a perception measurement frame based on a trigger frame.

[0375] In a possible implementation manner, the trigger frame-based sensing measurement frame is used for uplink concurrent channel estimation.

[0376] In a possible implementation manner, the trigger frame-based perception measurement frame is an EHT TB perception measurement frame, and the EHT TB perception measurement frame is used for an EHT site STA.

[0377] In a possible implementation manner, the EHT TB awareness measurement frame adopts the format of an EHT TBPPDU that does not include a data field.

[0378] In a possible implementation manner, the waveform generated by the EHT TB sensing measurement frame cannot use beamforming.

[0379] In a possible implementation, the EHT-STF field in the EHT TB awareness measurement frame is the same as the EHT-STF field in the EHT TB PPDU.

[0380] In a possible implementation manner, the duration of the packet extension field in the EHT TB perception measurement frame is 4 μs.

[0381] In a possible implementation manner, the spatial mapping matrix used for transmission of the EHT-LTF of the EHT TB perception measurement frame is determined by at least one of the following methods:

[0382] When the number of transmitted spatial streams NSS is equal to the number of transmitted transmission chains NTx, the spatial mapping matrix is ​​the identity matrix;

[0383] When NSS is less than NTx, the spatial mapping matrix is ​​an antenna selection matrix without antenna exchange;

[0384] When all zero rows are deleted, the spatial mapping matrix is ​​the identity matrix.

[0385] In a possible implementation manner, the EHT-LTF in the EHT TB perception measurement frame supports at least one of the following types:

[0386] 2×EHT-LTF+0.8μs GI;

[0387] 2×EHT-LTF+1.6μs GI;

[0388] 4×EHT-LTF+3.2μs GI.

[0389] In a possible implementation, the number of EHT-LTF symbols in the EHT TB-aware measurement frame is the product of the normal number of EHT-LTF symbols and the number of EHT-LTF repetitions.

[0390] In a possible implementation manner, the EHT-LTF repetition count is carried by a perception measurement trigger frame, and the perception measurement trigger frame is used to trigger the EHT TB perception measurement frame.

[0391] In a possible implementation manner, the trigger frame-based perception measurement frame is a HE TB perception measurement frame, and the HE TB perception measurement frame is used for HE STA.

[0392] In a possible implementation, the HE TB perception measurement frame adopts the format of HE TBPPDU that does not include a data field.

[0393] In a possible implementation manner, the waveform generated by the HE TB perception measurement frame cannot use beamforming.

[0394] In one possible implementation, the HE-STF field in the HE TB perception measurement frame is the same as the HE-STF field in the HE TB PPDU.

[0395] In a possible implementation manner, the duration of a packet extension (PE) field in the HE TB perception measurement frame is 4 μs.

[0396] In a possible implementation manner, the spatial mapping matrix used for transmission of the HE-LTF of the HE TB perception measurement frame is determined by at least one of the following methods:

[0397] When the number of transmitted spatial streams NSS is equal to the number of transmitted transmission chains NTx, the spatial mapping matrix is ​​the identity matrix;

[0398] When NSS is less than NTx, the spatial mapping matrix is ​​an antenna selection matrix without antenna exchange;

[0399] When all zero rows are deleted, the spatial mapping matrix is ​​the identity matrix.

[0400] In a possible implementation manner, the type of HE-LTF supported in the HE TB perception measurement frame is: 2×HE-LTF+1.6μs GI.

[0401] In one possible implementation, the number of HE-LTF symbols in the HE TB perception measurement frame is the product of the normal number of HE-LTF symbols and the number of HE-LTF repetitions.

[0402] In a possible implementation, the number of HE-LTF repetitions is carried by a perception measurement trigger frame, and the perception measurement trigger frame is used to trigger the HE TB perception measurement frame.

[0403] The communication device 1700 of the embodiment of the present application can implement the corresponding functions of the communication device 900 in the aforementioned method embodiment. The processes, functions, implementation methods and beneficial effects corresponding to the various modules (sub-modules, units or components, etc.) in the communication device 1700 can be found in the corresponding descriptions in the above-mentioned method embodiments, which will not be repeated here. It should be noted that the functions described by the various modules (sub-modules, units or components, etc.) in the communication device 1700 of the embodiment of the application can be implemented by different modules (sub-modules, units or components, etc.), or by the same module (sub-module, unit or component, etc.).

[0404] Fig.18 Schematic structural diagram of a communication device 1800 according to an embodiment of the present application. The communication device 1800 includes a processor 1810, and the processor 1810 can call and run a computer program from a memory to enable the communication device 1800 to implement the method in the embodiment of the present application.

[0405] In a possible implementation, the communication device 1800 may further include a memory 1820. The processor 1810 may call and run a computer program from the memory 1820, so that the communication device 1800 implements the method in the embodiment of the present application.

[0406] The memory 1820 may be a separate device independent of the processor 1810 , or may be integrated into the processor 1810 .

[0407] In a possible implementation, the communication device 1800 may further include a transceiver 1830, and the processor 1810 may control the transceiver 1830 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.

[0408] The transceiver 1830 may include a transmitter and a receiver. The transceiver 1830 may further include an antenna, and the number of antennas may be one or more.

[0409] In one possible implementation, the communication device 1800 may be the communication device of the embodiment of the present application, and the communication device 1800 may implement the corresponding processes implemented by the communication device in each method 800 of the embodiment of the present application, which will not be repeated here for the sake of brevity.

[0410] In one possible implementation, the communication device 1800 may be the communication device of the embodiment of the present application, and the communication device 1800 may implement the corresponding processes implemented by the communication device in each method 900 of the embodiment of the present application, which will not be repeated here for the sake of brevity.

[0411] Fig.19 1 is a schematic structural diagram of a chip 1900 according to an embodiment of the present application. The chip 1900 includes a processor 1910, and the processor 1910 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0412] In a possible implementation, the chip 1900 may further include a memory 1920. The processor 1910 may call and run a computer program from the memory 1920 to implement the method performed by the communication device 1600 or the communication device 1700 in the embodiment of the present application.

[0413] The memory 1920 may be a separate device independent of the processor 1910 , or may be integrated into the processor 1910 .

[0414] In a possible implementation, the chip 1900 may further include an input interface 1930. The processor 1910 may control the input interface 1930 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0415] In a possible implementation, the chip 1900 may further include an output interface 1940. The processor 1910 may control the output interface 1940 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0416] In one possible implementation, the chip can be applied to the communication device 1600 in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the communication device 1600 in the various methods of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0417] In one possible implementation, the chip can be applied to the communication device 1700 in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the communication device 1700 in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0418] The chip applied to the communication device 1600 and the communication device 1700 may be the same chip or different chips.

[0419] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0420] The processor mentioned above may be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC) or other programmable logic devices, transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor mentioned above may be a microprocessor or any conventional processor, etc.

[0421] The memory mentioned above may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM) or a flash memory. The volatile memory may be a random access memory (RAM).

[0422] It should be understood that the above-mentioned memory is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

[0423] Fig. 20 2 is a schematic block diagram of a communication system 2000 according to an embodiment of the present application. The communication system 2000 includes a first device 2010 and a second device 2020.

[0424] In one embodiment, the first device 2010 is used to send a trigger frame carrying information related to perception measurement. The second device 2020 is used to receive a trigger frame carrying information related to perception measurement. The first device 2010 can be used to implement the corresponding function implemented by the first device, such as AP, in the above method 800, and the second device 2020 can be used to implement the corresponding function implemented by the second device, such as STA, in the above method 800. For an example of the format of the trigger frame carrying information related to perception measurement, refer to the above method 800 and its related description. For the sake of brevity, it will not be repeated here.

[0425] In another embodiment, the second device 2020 is used to send a perception measurement frame based on a trigger frame. The first device 2010 is used to receive a perception measurement frame based on a trigger frame. The first device 2010 can be used to implement the corresponding function implemented by the first device, such as an AP, in the above method 900, and the second device 2020 can be used to implement the corresponding function implemented by the second device, such as an STA, in the above method 900. An example of the format of the perception measurement frame based on the trigger frame can be found in the above method 900 and its related description. For the sake of brevity, it will not be repeated here.

[0426] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function in accordance with the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that contains one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0427] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0428] It should be understood that the various embodiments and features of the various embodiments in the present application may be combined with each other without conflict.

[0429] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0430] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, comprising: The communication device sends and / or receives a trigger frame carrying information related to the sensing measurement; The perception measurement related information includes a field for indicating general information related to the trigger frame type; The field for indicating general information related to the trigger frame type includes a field for indicating the perception trigger frame subtype.

2. The method according to claim 1, wherein: The value of the field for indicating the perception trigger frame subtype is a first value, indicating that the trigger frame is a perception measurement polling trigger frame.

3. The method according to claim 2, wherein: The perception measurement polling trigger frame is used to trigger the transmission of the uplink extremely high throughput EHT TB physical layer protocol unit PPDU based on the trigger frame; The field used to indicate general information related to the trigger frame type is a field in the EHT variant general information field of the perception measurement polling trigger frame.

4. The method according to claim 2, wherein: The perception measurement polling trigger frame is used to trigger the transmission of the uplink high-efficiency HETB PPDU; The field used to indicate general information related to the trigger frame type is a field in the HE variant general information field of the perception measurement polling trigger frame.

5. The method according to claim 1, wherein: The value of the field for indicating the perception trigger frame subtype is the second value, indicating that the trigger frame is a perception measurement trigger frame.

6. The method according to claim 5, wherein: The perception measurement trigger frame is used to trigger the transmission of the uplink EHT TB perception measurement frame; The field used to indicate general information related to the trigger frame type is a field in the EHT variant general information field of the perception measurement trigger frame.

7. The method according to claim 6, wherein: At least one of the following in the EHT variant general information field in the perception measurement trigger frame becomes a reserved field and / or is set to a third value: a low-density parity check code LDPC additional symbol segment field, a forward error correction code FEC pre-fill factor field, and a packet extension PE disambiguation field.

8. The method according to claim 5, wherein: The perception measurement trigger frame is used to trigger the transmission of an uplink HE TB perception measurement frame; The field used to indicate general information related to the trigger frame type is a field in the HE variant general information field of the perception measurement trigger frame.

9. The method according to claim 8, wherein: At least one of the following in the HE variant general information field in the perception measurement trigger frame becomes a reserved field and / or is set to a fifth value: LDPC additional symbol segment field, FEC pre-fill factor field, PE disambiguation field, Doppler field, uplink space-time block coding field, MU-MIMO HE-LTF mode field.

10. A communication device, comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory, so that the communication device executes any one of claims 1 to 9.

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