CN112014809A

CN112014809A - Radar test method and device

Info

Publication number: CN112014809A
Application number: CN201910465180.3A
Authority: CN
Inventors: 韩霄; 尹瑞; 张中源; 闫莉; 张美红; 刘辰辰; 杜瑞; 李云波
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-12-01
Also published as: WO2020239125A1

Abstract

The application provides a radar test method and a radar test device, relates to the technical field of communication, and is used for supporting the realization of radar test in a WLAN. The method comprises the following steps: generating, by the first device, a second type of scan frame, the second type of scan frame including radar signals; the first device transmits one or more second type scan frames during a beamforming training phase. Therefore, the radar test can be compatible in the beamforming training process, and corresponding time domain resources do not need to be additionally allocated for the radar test.

Description

Radar test method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a radar testing method and apparatus.

Background

Radar testing finds objects with radio waves and detects the spatial position of objects. Introduction of radar testing in Wireless Local Area Networks (WLANs) is a promising technology in the future. The WIFI radar can be used for detecting the existence of people, identifying the actions of people, eliminating equipment faults and the like. The radar test is used in the WLAN, the existing network resources can be fully utilized, and a large amount of radars do not need to be additionally deployed, so that the cost is saved.

However, the industry has not provided a corresponding solution for how to implement radar testing in WLANs.

Disclosure of Invention

The application provides a radar test method and a radar test device, which are used for supporting the realization of radar test in a WLAN.

In a first aspect, a radar testing method is provided, including: generating, by a first device, a second type of scan frame, the second type of scan frame comprising radar signals; the first device sends one or more second type scan frames during a beamforming training phase.

Based on the technical scheme, the first device can realize radar test by sending the second type scanning frame in the beamforming training stage. The technical scheme of the application realizes the compatibility of the beam forming training and the radar test in the process, so that the first equipment can simultaneously carry out the beam forming training and the radar test, and does not need to additionally allocate time domain resources for the radar test, thereby being beneficial to saving signaling overhead and resource overhead. The technical scheme of the application can support the realization of radar test in the WLAN.

In one possible design, the first device determines the number of transmissions of the second type of scan frame based on the FSS value.

Alternatively, the FSS value may be determined from a beacon frame transmitted by the second device.

In one possible design, the determining, by the first device, the number of transmissions of the second type of scan frame according to the FSS value includes: the first equipment determines the sending number of the second type scanning frames according to the FSS value and the first corresponding relation; wherein the first corresponding relationship is a corresponding relationship between the FSS value and the number of the second type of scanning frames.

Optionally, the second type scanning frame is a second type sector scanning SSW frame, or a second type short sector scanning shortSSW frame. The first correspondence may be as shown in the following table:

in one possible design, the time duration of the radar signal in the second type of scan frame is determined according to the following equation:

the tx time (radar signal) represents the time length of the radar signal, the tx time (first type scan frame) represents the time length of the first type scan frame, the SBIFS represents the short beam forming inter-frame interval, x represents the number of the first type scan frames corresponding to the FSS value, and y represents the number of the second type scan frames corresponding to the FSS value.

In one possible design, the determining, by the first device, the number of transmissions of the second type of scan frame according to the FSS value includes: and the first equipment determines the sending number of the second type scanning frames according to the FSS value and the time length of the radar signal.

In one possible design, the number of second type scan frames sent is determined according to the following equation:

wherein m represents the number of transmissions of the second type of scan frame.

In one possible design, the determining, by the first device, the number of transmissions of the second type of scan frame according to the FSS value includes: the first equipment determines the sending number of the second type scanning frame according to the FSS value, the length type of the radar signal and the second corresponding relation; and the second corresponding relation is the corresponding relation among the FSS value, the length type of the radar signal and the sending number of the second type scanning frames.

In one possible design, if the number of transmissions of the second type of scan frame is the same as the number of transmissions of the first type of scan frame for the same FSS value, the sector sweep timeslot is determined according to the following equation:

aSSSlotTime＝aAirPropagationTime+assduration+radar signal length*N+MBIFS+aSSFBDuration+MBIFS；

wherein, aSSSlotTime represents the time length of a sector scanning slot, aarspropagationtime represents the propagation delay between the first device and the second device, an allocation represents the time required by the first device to transmit a first type scanning frame under a corresponding FSS value, a radar signal length represents the time length of a radar signal in a second type scanning frame, N represents the number of sending second type scanning frames, assfbdation represents the time required by the second device to execute an SSW feedback process, and MBIFS represents the inter-frame shaping interval of a medium beam.

In one possible design, the method further includes: the first device receives a beacon frame sent by the second device, wherein the beacon frame comprises radar test information. Based on the design, since the beacon frame includes the radar test information, the first device may perform a corresponding radar test in the beamforming training stage according to the radar test information.

In one possible design, the radar test information includes at least one of the following parameters: a radar data feedback type, a radar signal length type, and indication information. And the radar data feedback type is used for indicating radar test data to be fed back. The length type of the radar signal is used to determine a length of time of the radar signal. The indication information is used for indicating one or more first devices needing radar test.

In one possible design, the method further includes: the first equipment sends radar test data to the second equipment in a first SP, and the first SP is used for feeding back the radar test data. Based on the design, the second device can acquire the radar test data.

In one possible design, the method further includes: the method comprises the steps that a first device sends an association request frame to a second device, and the association request frame is used for indicating whether the first device has radar test capability or not. Based on the design, the first device sends an association request frame to the second device during an association phase, the association request frame being usable to indicate whether the first device is radar-testing capable. Therefore, the second equipment can know whether the first equipment can carry out the radar test or not according to the association request frame, so that the second equipment is prevented from scheduling the first equipment without the radar test capability to carry out the radar test, and the normal execution of the radar test process is ensured.

In a second aspect, a radar testing method is provided, including: the second device generates a beacon frame that includes the radar test information. The second device transmits beacon frames to the one or more first devices.

Based on the above technical scheme, because the beacon frame includes the radar test information, the first device can perform a corresponding radar test in the beamforming training stage according to the radar test information.

In one possible design, the beacon frame further includes an FSS value, and the FSS value is used to determine the number of transmissions of the second type of scan frame.

In one possible design, there is a correspondence between the number of transmissions of the second type of scan frame and the FSS value. The correspondence relationship can refer to table 2 below.

In one possible design, the number of transmissions of the second type of scan frame is determined based on the FSS value and the length of time of the radar signal.

In one possible design, there is a correspondence between the FSS value, the type of length of the radar signal, and the number of transmissions of the second type of scan frame.

In one possible design, the method further includes: the second equipment receives the radar test data sent by the first equipment in a first SP, wherein the first SP is used for feeding back the radar test data.

In one possible design, the method further includes: the method comprises the steps that a second device receives an association request frame sent by a first device, wherein the association request frame is used for indicating whether the first device has radar test capability or not; the second device determines whether the first device has radar test capability according to the association request frame.

In a third aspect, a radar testing method is provided, including: the method comprises the steps that first equipment receives a first indication frame sent by second equipment, wherein the first indication frame is used for indicating scheduling information of radar test; the first equipment sends a first response frame to the second equipment, and the first response frame is used for responding to the first indication frame; the first equipment receives a second indication frame sent by the second equipment, and the second indication frame is used for indicating the first equipment to carry out radar test; and the first equipment carries out radar test according to the scheduling information of the radar test.

Based on the technical scheme, the second device sends the first indication frame, so that the first devices acquire the scheduling information of the radar test. And then, the second equipment sends a second indication frame to the first equipment to uniformly schedule the plurality of first equipment to carry out radar test according to the scheduling information of the radar test, so that the multi-station radar test is realized.

In one possible design, the scheduling information for the radar test includes at least one of the following parameters: information of the radar SP, a radar data feedback type, and radar transmission/reception control information. The information of the radar SP comprises information of a second SP and information of a third SP, wherein the second SP is used for radar test, and the third SP is used for feeding back radar test data. The radar data feedback type is used for indicating radar test data to be fed back. The radar transceiving control information is used for indicating the function of each of the M first devices in radar test, and M is a positive integer.

In one possible design, the first device receiving a second indication frame sent by a second device includes: and the first device receives a second indication frame sent by the second device in the second SP.

In one possible design, the first device performs the radar test according to scheduling information of the radar test, including: and the first equipment carries out radar test in the second SP according to the scheduling information of the radar test.

In one possible design, the first device performs the radar test according to scheduling information of the radar test, including: if the first equipment serves as a sending end of the radar, the first equipment sends radar signals in a sector scanning mode; and if the first equipment is used as a receiving end of the radar, the first equipment receives the radar signal in a quasi-omnidirectional mode.

In one possible design, the method further includes: and the first equipment sends second response information to the second equipment in the second SP, wherein the second response information is used for indicating that the first equipment completes the radar test.

In one possible design, the method further includes: the first equipment receives third indication information sent by the second equipment, wherein the third indication information is used for indicating the first equipment to feed back radar test data; the first device sends radar test data to the second device.

In one possible design, the receiving, by the first device, the third indication information sent by the second device includes: and the first equipment receives the third indication information sent by the second equipment in the third SP.

In one possible design, a first device sending radar test data to a second device, comprising: the first device sends radar test data to the second device within the third SP.

In one possible design, the method further includes: the method comprises the steps that a first device sends an association request frame to a second device, and the association request frame is used for indicating whether the first device has radar test capability or not.

In a fourth aspect, a radar testing method is provided, including: the method comprises the steps that a second device sends a first indication frame to M first devices, wherein the first indication frame is used for indicating scheduling information of radar test, and M is a positive integer; the second device receives a first response frame sent by each of the M first devices respectively, wherein the first response frame is used for responding to the first indication frame; and the second equipment sends a second indication frame to the N first equipment, wherein the second indication frame is used for indicating the first equipment to carry out radar test, the N first equipment is a subset of the M first equipment, and N is a positive integer less than or equal to M.

In one possible design, the second device sending a second indication frame to the N first devices includes: the second device transmits a second indication frame to the N first devices within the second SP.

In one possible design, the method further includes: and the second equipment receives second response information sent by the first equipment in a second SP, wherein the second response information is used for indicating that the first equipment completes the radar test.

In one possible design, the method further includes: the second equipment sends third indication information to the first equipment, and the third indication information is used for indicating the first equipment to feed back radar test data; and the second equipment receives the radar test data sent by the first equipment.

In one possible design, the sending, by the second device, the third indication information to the first device includes: the second device sends third indication information to the first device in a third SP.

In one possible design, the second device receives radar test data sent by the first device, and includes: and the second equipment receives the radar test data sent by the first equipment in the third SP.

In one possible design, the method further includes: the second device receives an association request frame sent by a third device, wherein the association request frame is used for indicating whether the first device has radar test capability or not.

In a fifth aspect, a communication apparatus is provided, which may be a first device or an apparatus in the first device. In one design, the apparatus may include means for performing a one-to-one correspondence of the methods/operations/steps/actions described in the first aspect and any of its designs, or the third aspect and any of its designs. The modules may be implemented by hardware circuits, software, or a combination of hardware circuits and software.

A sixth aspect provides a communication apparatus, which may be the second device or an apparatus in the second device. In one design, the apparatus may include means for performing the one-to-one correspondence of the methods/operations/steps/actions described in the second aspect and any of its designs, or the fourth aspect and any of its designs. The modules may be implemented by hardware circuits, software, or a combination of hardware circuits and software.

In a seventh aspect, a communication device is provided, which includes a processor and a transceiver, where the processor is configured to perform the processing operations in the radar testing method according to any one of the first to fourth aspects, such as generating the second type scan frame. The transceiver is configured to receive control of the processor, and perform transceiving operations in the radar testing method designed by any one of the first to fourth aspects, such as sending second-type scan frames.

In an eighth aspect, there is provided a computer-readable storage medium for storing instructions which, when read by a computer, are used to carry out the radar testing method according to any one of the first to fourth aspects.

In a ninth aspect, a computer program product is provided that includes instructions. When the computer reads the instructions, the computer performs the radar testing method according to any one of the possible designs of the first to fourth aspects.

In a tenth aspect, a chip is provided that includes processing circuitry and transceiver pins. Optionally, the chip further comprises a memory. Wherein the processing circuit is configured to perform processing operations in the radar testing method according to any one of the first to fourth aspects, such as generating a second type of scan frame. The transceiving pin is used for receiving control of the processing circuit, and performing transceiving operation in the radar testing method according to any one of the first to fourth aspects, for example, sending a second type of scan frame. The memory is for storing instructions to be invoked by the processor for performing processing operations in a radar testing method according to any one of the possible designs of the first to fourth aspects.

In an eleventh aspect, there is provided a communication system comprising: a first device and a second device. Wherein the first device is configured to perform the radar testing method according to any one of the first aspect or the third aspect; the second device is configured to perform the radar testing method according to any one of the designs of the second aspect or the fourth aspect.

The technical effects brought by any design of the fifth aspect to the eleventh aspect can refer to the beneficial effects in the corresponding methods provided above, and are not repeated herein.

Drawings

Fig. 1 is a schematic structural diagram of a beacon interval according to an embodiment of the present disclosure;

fig. 2 is a schematic flowchart of beamforming training provided in an embodiment of the present application;

fig. 3 is a flowchart of a radar testing method according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a radar signal at the head of a second type of scan frame according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a radar signal in the middle of a second type of scan frame according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a radar signal at the end of a second type of scan frame according to an embodiment of the present application;

fig. 7 is a schematic view of a scene in which a first device transmits a first type scan frame according to an embodiment of the present disclosure;

fig. 8 is a schematic view of a scenario of a single-station radar test according to an embodiment of the present disclosure;

fig. 9 is a schematic view of a multi-station radar test scenario provided in an embodiment of the present application;

fig. 10 is a flowchart of a radar testing method according to an embodiment of the present disclosure;

fig. 11 is a schematic diagram of a frame structure of a beacon frame according to an embodiment of the present application;

fig. 12 is a schematic diagram of a frame structure of another beacon frame provided in an embodiment of the present application;

fig. 13 is a flowchart of a capability reporting method according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of an EMDG capabilities element provided in the embodiment of the present application;

FIG. 15 is a method for feeding back radar test data according to an embodiment of the present disclosure;

fig. 16 is a schematic diagram of a frame structure of an SPR frame according to an embodiment of the present application;

FIG. 17 is a timing diagram of a radar test according to an embodiment of the present disclosure;

fig. 18 is a flowchart of a radar testing method according to an embodiment of the present disclosure;

fig. 19 is a schematic diagram of a frame structure of a first indication frame according to an embodiment of the present application;

FIG. 20 is a flowchart of a method for feeding back radar test data according to an embodiment of the present disclosure;

FIG. 21 is a timing diagram of a radar test according to an embodiment of the present disclosure;

fig. 22 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 23 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

In the description of this application, "/" means "or" unless otherwise stated, for example, A/B may mean A or B. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" means one or more, "a plurality" means two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the description of the present application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. If information indicated by certain information (such as indication information described below) is referred to as information to be indicated, there are many ways of indicating the information to be indicated in a specific implementation process. For example, the information to be indicated may be directly indicated, wherein the information to be indicated itself or an index of the information to be indicated, and the like. For another example, the information to be indicated may also be indirectly indicated by indicating other information, where the other information and the information to be indicated have an association relationship. For another example, only a part of the information to be indicated may be indicated, while the other part of the information to be indicated is known or predetermined. In addition, the indication of the specific information can be realized by means of the arrangement order of each information agreed in advance (for example, specified by a protocol), so that the indication overhead can be reduced to a certain extent.

For the sake of easy understanding, the technical terms related to the embodiments of the present application will be briefly described below.

1. Radar apparatus

The radar can be divided into a single-station radar, a bistatic radar and a multi-base radar according to whether a transmitting end and a receiving end are co-located. And the transmitting end and the receiving end of the single-station radar are co-located. The receiving and transmitting ends of the bistatic and multistatic radars are physically separated.

2. Beacon Interval (BI)

In the 802.11ad/ay standard, the time axis is divided into a plurality of BI's. As shown in fig. 1, the BI includes a Beacon Header Indication (BHI) and a Data Transmission Interval (DTI).

The BHI includes: beacon Transmission Interval (BTI), association beamforming training (a-BFT), and Announcement Transmission Interval (ATI).

The DTI may be divided into several sub-intervals. Wherein there are two types of subintervals: based on a Contention Based Access Period (CBAP) and a Service Period (SP). For example, the DTI may include CBAP1, CBAP2, SP1, SP2, and the like.

In the BTI, the PCP/AP transmits a plurality of beacon (beacon) frames according to the sector number to perform downlink sector scanning.

Within the a-BFT, a Station (STA) may associate with a personal basic service set control point (PCP) or an Access Point (AP), and the STA may perform uplink sector scanning.

Within ATI, the PCP/AP may poll the STAs for buffered data information and allocate resources in DTI to the STAs.

The above is a brief introduction to the BI, and specific information of the BI may be referred to the description in the standard.

3. Wave beam

The transmit beam may refer to a distribution of signal strengths formed in different spatial directions after the signal is transmitted through the antenna, and the receive beam may refer to a distribution of signal strengths of the wireless signal received from the antenna in different spatial directions.

The beam may be a wide beam, or a narrow beam, or other type of beam. The technique of forming the beam may be a beamforming technique or other technique. The beamforming technology may specifically be a digital beamforming technology, an analog beamforming technology, or a hybrid digital/analog beamforming technology.

4. Beamforming training

Beamforming, also called beamforming, spatial filtering, is a signal processing technique that uses a sensor array to directionally transmit and receive signals.

The beamforming training is used to form aligned transmit and receive beams between the transmitting end and the receiving end, so that normal communication between the transmitting end and the receiving end is possible. As shown in fig. 2, the beamforming training mainly includes two parts: Sector-Level Sweep (SLS), and Beam Refining (BRP)

(1) SLS comprises the following phases:

an Initiator Sector Sweep (ISS) phase to train the initiator's directional transmit beam. The initiator directionally transmits training data by a beam with a certain width, and the responder receives the training data in a quasi-omnidirectional mode.

And a Responder Sector Sweep (RSS) stage for training the directional transmission beam of the responder. The responder transmits training data in a beam direction with a certain width and contains the best transmitting sector information of the initiator at the previous stage, and the initiator receives the training data in a quasi-omnidirectional mode.

In a sector level scan Feedback (SSW Feedback) phase, an initiator sends Feedback information to an responder, where the Feedback information is a list of initiator sending sectors sorted according to sector quality and includes the best sector of the responder in the previous phase. In addition, the responder is now in a quasi-omni reception mode.

And the sector scanning acknowledgement (SSW ACK) is used for feeding back the responder sending sector lists which are sorted according to the quality to the initiator. SSW ACK is optional, and there may be no SSW ACK phase for SLS execution before DTI, and a SSW ACK phase may be required for SLS execution during DTI.

(2) BRP includes the following stages:

a setup for initialization (BRP setup) phase for configuring training information for a subsequent multiple sector sounding (MID) and Beam Combining (BC) phase.

And in the MID stage, the optimal receiving beams of the initiator and the responder are trained, the method is similar to the training process of the optimal transmitting beams, and only a quasi-omni mode is adopted to transmit training data, while a directional mode is adopted to receive the training data.

And the BC stage is used for pairing the transmitting and receiving beams respectively trained by the SLS stage and the MID stage to obtain the optimal transmitting and receiving beam pairing so as to find the optimal directional communication link. At this time, the directional mode is adopted for both transmitting and receiving training data.

And at least one round of Beam Refinement (BRT) stage for further Beam Refinement, thereby iteratively finding more refined Beam pairs and improving the quality of the communication link.

5. Radar test data

In embodiments of the present application, the radar test data may include at least one of the following parameters:

(1) channel State Information (CSI). The CSI is used to reflect the state of the channel. Optionally, the CSI may include at least one of the following parameters: a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), a Channel Quality Indicator (CQI), a channel state information reference signal resource indicator (CRI), and a Layer Indicator (LI).

(2) Sample data of a time domain signal, comprising: each sampling point and corresponding sampling value of the time domain signal which is not subjected to the fast Fourier numbering.

(3) And (6) FFT mapping. The FFT map is obtained by FFT conversion of the sampled digital signal. The FFT map may be a rag-FFT map, a doppler-FFT map, or an angle-FFT map.

(4) Radar test results, including: distance, speed, and angle. Wherein, the distance is the distance between the measured object and the radar. The velocity is the velocity of the object to be measured. The angle is the angle between the object to be measured and the radar.

It should be noted that the distance may be determined according to a value of an abscissa corresponding to a peak in the range-FFT spectrum. The speed can be taken according to the abscissa corresponding to the peak in the doppler-FFT spectrum. The angle can be determined according to the value of the abscissa corresponding to the peak value in the angle-FFT map.

6. FSS value

The FSS value is used for determining the number of short SSW/SSW frames transmitted in the sector sweep time slot. As shown in table 1, the correspondence between the FSS value and the number of short SSW/SSW frames transmitted is defined in the current standard.

TABLE 1

The above is an introduction of terms related to the embodiments of the present application, and the details are not described below.

The technical solution of the present application is applied to a WLAN, and the standard adopted by the WLAN may be an 802.11 standard of IEEE, such as an 802.11ad standard, an 802.11ay standard, and a next generation 802.11 standard.

The technical solution of the present application may also be applied to a cellular communication system, such as a fourth generation (4th generation, 4G) communication system and a fifth generation (5th generation, 5G) communication system.

The applicable scenes of the technical scheme of the application comprise: a communication scenario between a first device and a second device, a communication scenario between a first device and a first device, a communication scenario between a second device and a second device. Wherein the first device may be a STA. STAs may have different names, e.g., subscriber unit, access terminal, mobile station, mobile device, terminal, user equipment, etc. In practical applications, the STA may be a cellular phone, a smart phone, a Wireless Local Loop (WLL), and other handheld devices, computer devices, etc. with wireless local area network communication functions. The second device may be a base station, a PCP, or an AP. The AP may be a wireless router, wireless transceiver, wireless switch, etc.

The technical scheme of the application is introduced mainly from a communication scene between the first device and the second device, and technical schemes in other scenes can be realized by referring to the communication scene between the first device and the second device.

The technical solutions provided by the embodiments of the present application are specifically described below with reference to the drawings of the specification of the present application.

As shown in fig. 3, a radar testing method provided for the embodiment of the present application includes:

s101, the first equipment generates a second type scanning frame, and the second type scanning frame comprises radar signals.

The second type scan frame may be a second type short SSW frame or a second type SSW frame.

For convenience of description, the embodiments of the present application refer to a short SSW frame/SSW frame in the prior art as a first type scan frame. It will be appreciated that the second type of scan frame corresponds to a combination of the first type of scan frame and the radar signal. The second type of scan frame may be used for radar testing as compared to the first type of scan frame.

Optionally, the radar signal carried by the second type of scan frame may be implemented by using information already in the current short SSW/SSW frame.

Alternatively, the radar signal carried by the second type of scan frame may be carried in a new independent field (alternatively referred to as a bit field). The location of the field for carrying radar signals in the second type scanning frame is not limited in the embodiments of the present application, for example, the field for carrying radar signals may be located in the head, middle, or end of the second type scanning frame.

Illustratively, as shown in fig. 4, a schematic diagram of a radar signal at the head of a second type scan frame is provided for the embodiment of the present application. Fig. 5 is a schematic diagram of a radar signal in the middle of a second type scan frame according to an embodiment of the present application. Fig. 6 is a schematic diagram of a radar signal at the end of a second type scan frame according to an embodiment of the present application.

In the embodiment of the present application, the radar signal may be a sequence or data for radar test, and the embodiment of the present application is not limited thereto.

S102, the first equipment sends one or more second type scanning frames in a beamforming training stage.

Wherein, the beamforming training stage may be a-BFT. It should be noted that, since the a-BFT includes a plurality of sector scanning slots (an SSW slot, aSSSlotTime), step S102 may also be specifically implemented as: the first device transmits one or more second type scan frames in the sector scan slot.

It should be noted that, before sending the second type scan frame, the first device needs to determine the number of second type scan frames sent in one sector scan slot. In this way, the first device may send a corresponding number of second-type scan frames in the sector scan timeslot to implement beamforming training.

For convenience of description, the number of the second type scan frames transmitted in one sector scan slot is simply referred to as the number of the second type scan frames, which is herein collectively described and is not described in detail below.

In this embodiment, the first device may determine the number of transmissions of the second type scan frame according to the FSS value.

Where the FSS value may be indicated by the second device, for example, the second device transmits a beacon frame to the first device, the beacon frame including the FSS value.

Optionally, the determining, by the first device, the number of the second type frames to be sent according to the FSS value includes:

in the first implementation manner, the first device determines the sending number of the second type scanning frames according to the FSS value and the first corresponding relation.

Wherein, the first corresponding relation is the corresponding relation between the FSS value and the sending number of the second type scanning frame. It should be noted that the first corresponding relationship may be configured in advance, or may be defined in a standard, and this is not limited in the embodiment of the present application.

For example, the first correspondence relationship may be as shown in table 2 below. Wherein a, B, C, D, E, F, G, H, I, J, K, L, N, M, O, P, A, B, C, D, E, F, G, H, I, J, K, L, N, M, O and P are integers which are more than or equal to 0.

TABLE 2

Alternatively, the first correspondence may be as shown in a part of the columns in table 3. Table 3 shows not only the correspondence between the FSS value and the number of transmissions of the second type scan frame but also the correspondence between the FSS value and the number of transmissions of the first type scan frame.

TABLE 3

Based on the first implementation manner, the time length of the radar signal in the second type scan frame may be configured in advance, or may be determined by the first device according to the following formula (1).

The first device may determine a length of time for the radar signal in the second type of scan frame according to equation (1) below.

The tx time (radar signal) represents the time length of the radar signal, the tx time (first type scan frame) represents the time length of the first type scan frame, the SBIFS represents the short beam forming inter-frame interval, x represents the number of the first type scan frames corresponding to the FFS value, and y represents the number of the second type scan frames corresponding to the FSS value.

And secondly, the first equipment determines the sending number of the second type scanning frame according to the FSS value, the length type of the radar signal and the second corresponding relation.

The second corresponding relation is the corresponding relation among the FSS value, the length type of the radar signal and the sending number of the second type scanning frames. It should be noted that the second corresponding relationship may be configured in advance, or may be defined in a standard, and the embodiment of the present application is not limited thereto.

It is understood that the second correspondence relationship can also be expressed as: a correspondence between the type of length of the radar signal and the first correspondence. That is, there is a first correspondence for the first device to match each type of length of the radar signal. In this case, the first device determines the number of sending second-type scan frames according to the FSS value, the length type of the radar signal, and the second correspondence, and may specifically be implemented as: the method comprises the steps that first equipment determines a first corresponding relation matched with the length type of a radar signal according to the length type of the radar signal; and then, the first equipment determines the sending number of the second type scanning frames according to the FSS value and the first corresponding relation matched with the length type of the radar signal.

Optionally, the length type of the radar signal is used to directly indicate the time length of the radar signal. Each radar signal length type directly indicates the time length of one radar signal. For example, the length types of the radar signal include a first length type, a second length type, and a third length type. The radar signals indicated by the first length type have a time length of 4us, the radar signals indicated by the second length type have a time length of 8us, and the radar signals indicated by the third length type have a time length of 12 us.

For example, if the time length of the radar signal indicated by the first length type is 4us, the first corresponding relationship matching the first length type may be as shown in table 4 below.

TABLE 4

For example, if the time length of the radar signal indicated by the second length type is 8us, the first corresponding relationship matching the second length type may be as shown in table 5 below.

TABLE 5

For example, if the time length of the radar signal indicated by the third length type is 12us, the first corresponding relationship matching the third length type may be as shown in table 6 below.

TABLE 6

Alternatively, in table 4, table 5, and table 6, when the FSS value is 0, the number of transmission of the second type scan frame may be 1.

Alternatively, the length type of the radar signal is used to indicate the length of time the radar signal is indirectly indicated. Or, the length type of the radar signal is used to represent the range of values of the time length of the radar signal.

For example, the length types of the radar signal include a first length type, a second length type, and a third length type. The first length type corresponds to a first value range, the second length type corresponds to a second value range, and the third length type corresponds to a third value range. The first value range is smaller than the second value range, and the second value range is smaller than the third value range. For example, for a second type short SSW frame, the first range may be 0-4.9us, the second range may be 0-19.6us, and the third range may be 0-29.4 us. The above are merely examples, and embodiments of the present application are not limited thereto.

Illustratively, for a first length type, table 7 shows a corresponding first correspondence, and the length of time of the radar signal for each FSS value.

TABLE 7

Illustratively, for the second length type, table 8 shows the corresponding first correspondence, and the length of time of the radar signal for each FSS value.

TABLE 8

Illustratively, for the third length type, table 9 shows the corresponding first correspondence, and the time length of the radar signal for each FSS value.

TABLE 9

And the first equipment determines the sending number of the second type scanning frames according to the time length and the FSS value of the radar signal.

Where the length of time of the radar signal may be preconfigured, for example, the second device transmits a beacon frame to the first device, the beacon frame including the length of time of the radar signal. Still alternatively, the time length of the radar signal is defined in the standard. Or, the time length of the radar signal is determined by the first device according to the actual application scene.

Optionally, based on the third implementation, the number of the second type scan frames to be transmitted may be determined according to the following formula (2):

where m represents the number of transmissions of the second type of scan frame.

Indicating a rounding down.

And the first equipment determines the sending number of the second type scanning frames according to the maximum value and the FSS value of the time length of the radar signal.

Wherein the maximum value of the time length of the radar signal may be preconfigured, e.g. the second device transmits a beacon frame to the first device, the beacon frame comprising the maximum value of the time length of the radar signal. Alternatively, the maximum value of the time length of the radar signal is defined in the standard. Alternatively, the maximum value of the time length of the radar signal is determined by the first device according to the actual application scenario.

Optionally, based on the fourth implementation, the number of the second type scan frames to be sent may be determined according to the following formula (3):

wherein txtime (radar signal max) represents the maximum value of the time length of the radar signal in the second type of scan frame.

And the first equipment determines the sending number of the second type scanning frames according to the minimum value and the FSS value of the time length of the radar signal.

Wherein txtime (radar signal min) represents the minimum value of the time length of the radar signal in the second type of scanning frame.

For the first implementation, the third implementation, the fourth implementation, and the fifth implementation, when the first device sends the second type short SSW frame, the parameter TXTIME (first type scan frame) in the above formulas (1), (2), (3), and (4) may be replaced by TXTIME (short SSW). Wherein txtime (shortssw) represents the time length of the first type shortssw frame. When the first device transmits the second type SSW frame, the parameter TXTIME (first type scan frame) in the above equations (1), (2), (3), and (4) may be replaced with TXTIME (SSW). Wherein txtime (SSW) represents the time length of the first type SSW frame.

In addition, it should be noted that, for the above-mentioned implementation one to implementation five, the sector sweep time slot may be calculated according to a formula in the prior art.

And the first equipment determines the number of the sent first type scanning frames according to the FSS value and the mansion relationship between the FSS value and the number of the sent first type scanning frames, and further determines the number of the sent second type scanning frames. That is, the number of transmissions of the first type of scan frame is the same as the number of transmissions of the second type of scan frame for the same FSS value.

In the case of implementation six, the calculation formula of the sector sweep time slot needs to be updated compared to the prior art.

Optionally, based on the sixth implementation, the sector sweep time slot may be determined according to the following formula (5):

aSSSlotTime＝aAirPropagationTime+assduration+radar signal length*N (5)

+MBIFS+aSSFBDuration+MBIFS

wherein, the assslottitime represents a time length of the sector scanning time slot. aAirPropagationTime represents the propagation delay between the first device and the second device. The duration represents the time required by the first device to transmit the first type of scanning frame under the corresponding FSS value, the radar signal length represents the time length of the radar signal in the second type of scanning frame, N represents the number of the second type of scanning frames, aSFBDration represents the time required by the second device to execute the SSW feedback process, and MBIFS represents the inter-frame interval of medium beamforming.

It should be noted that the time length of the sector sweep time slot determined based on equation (5) is larger than the time length of the sector sweep time slot determined in the prior art. That is, in the embodiment of the present application, by increasing the length of the sector scanning time slot, the number of the second type scanning frames sent by the first device performing the radar test may be the same as the number of the first type scanning frames sent by the first device not performing the radar test, so that it is ensured that the first device performing the radar test can implement the relatively accurate beamforming training.

In addition, based on the sixth implementation manner, as shown in fig. 7, in the sector scanning timeslot, the first device that does not perform the radar test needs to additionally send an empty data packet (empty packet) with the same time length as the radar signal after sending the first type scanning frame, so as to ensure that the sector scanning timeslot of the first device that does not perform the radar test is the same as the sector scanning timeslot of the first device that performs the radar test in time length.

Based on the technical scheme shown in fig. 3, the first device may implement radar testing by sending a second type of scan frame in the beamforming training stage. The technical scheme of the application realizes the compatibility of the beam forming training and the radar test in the process, so that the first equipment can simultaneously carry out the beam forming training and the radar test, and does not need to additionally allocate time domain resources for the radar test, thereby being beneficial to saving signaling overhead and resource overhead. The technical scheme of the application can support the realization of radar test in the WLAN.

It should be noted that the technical solution shown in fig. 3 can implement a single-station radar test. That is, after the first device sends the second type scan frame, the first device needs to receive a reflected wave of the radar signal to complete the radar test. As shown in fig. 8, the STA1 transmits the second type scan frame, and the STA1 receives the reflected wave of the radar signal.

The solution shown in fig. 3 may also enable multi-station radar testing. That is, one first device transmits the second type scan frame, and the other first devices receive the reflected wave of the radar signal. As shown in fig. 9, STA1 transmits the second type scan frame, and STA2 and STA3 receive reflected waves of the radar signal.

As shown in fig. 10, a radar testing method provided in the embodiment of the present application includes the following steps:

s201, the second device transmits a beacon frame to the one or more first devices, so that the one or more first devices receive the beacon frame transmitted by the second device.

Wherein the beacon frame includes radar test information. The radar test information includes at least one of the following parameters: a radar data feedback type, a radar signal length type, and indication information.

(1) The radar data feedback type is used for indicating radar test data to be fed back. Alternatively, the radar data feedback type is used to instruct the first device to feed back the content included in the radar test data. For example, the radar data feedback type may only indicate that the first device is feeding back sample data of the time domain signal. Alternatively, the radar data feedback type may instruct the first device to feedback the sampled data of the time domain signal, and the FFT map.

(2) The length type of the radar signal is used to determine the length of time of the radar signal. Optionally, the length type of the radar signal is used to directly indicate the time length of the radar signal. Or the length type of the radar signal is used for representing the value range of the radar signal. A plurality of length types of the radar signal, such as a first length type, a second length type, and a third length type, may be predefined in the standard, and the embodiment of the present application is not limited thereto.

(3) The indication information is used for indicating one or more target first devices, and the target first devices are first devices needing radar test.

As an implementation manner, the indication information includes information of one or more target first devices, and the information of the target first devices may be Association Identifiers (AIDs).

As another implementation, the indication information may include: a bitmap offset value (bitmap offset) and a partial virtual bitmap (partial virtual bitmap).

And the bitmap offset value is used for determining AID corresponding to the first bit in the partial virtual bitmap. For example, if the bitmap offset value is 300, the AID corresponding to the first bit in the partial virtual bitmap is 300.

Each bit in the partial virtual bitmap corresponds to one AID, and different bits correspond to different AIDs. Optionally, in the partial virtual bitmap, if two bits are adjacent, two AIDs corresponding to the two bits are also adjacent. For example, the AID corresponding to the first bit in the partial virtual bitmap is 300, the AID corresponding to the second bit is 301, the AID corresponding to the third bit is 302, and so on, which is not described herein again.

In the partial virtual bitmap, a value of each bit is used to indicate whether the first device having the AID corresponding to the bit needs to perform a radar test. For example, in the partial virtual bitmap, if a bit takes the value of "0", the first device having the AID corresponding to the bit does not need to perform a radar test; if the value of one bit is "1", the first device having the AID corresponding to the bit needs to perform a radar test.

Of course, the indication information may also be implemented in other ways, and the embodiment of the present application is not limited thereto.

In the embodiment of the present application, the beacon frame is used to instruct the first device to perform a radar test in a beamforming training phase. Or, the beacon frame is used to instruct the first device to transmit the second type scan frame in the beamforming training phase.

Optionally, the beacon frame specifically includes the following two cases:

case one, the beacon frame is used to instruct a first device with radar testing capability to perform radar testing during a beamforming training phase.

In this way, whether the first device has an association relationship with the second device or not, when the first device has radar testing capability, the first device performs radar testing in the beamforming training stage after receiving the beacon frame.

Optionally, based on the case one, as shown in fig. 11, a schematic diagram of a frame structure of a beacon frame provided in the embodiment of the present application is shown. Wherein the beacon frame comprises at least the following bit fields: frame control, duration, Basic Service Set Identification (BSSID), radar element (radar element), and FCS.

Wherein, the radar unit bit field at least comprises the following bit fields: radar parameter (radar parameter), radar signal length type (radar signal length type).

In the embodiment of the application, the radar parameter bit field is used for carrying radar data feedback types. The radar signal length type bit field is used to indicate the length type of the radar signal.

Optionally, the radar parameter bit fields at least include the following bit fields: CSI, before FFT, FFT info, FFT result, and reserved (reserved).

The CSI bit field is used to indicate whether the first device feeds back CSI. Alternatively, the CSI bit field may be implemented with 1 bit. The value of the CSI bit field is '0', which means that the first equipment does not need to feed back the CSI; the value of the CSI bit field is "1", which indicates that the first device needs to feed back CSI.

The before FFT bit field is used to indicate whether the first device feeds back the sampled data of the time domain signal. Alternatively, the before FFT bit field may be implemented with 1 bit. The value of the before FFT bit field is '0', which means that the first device does not need to feed back the sampling data of the time domain signal; the value of the before FFT bit field is "1", which indicates that the first device needs to feed back the sampling data of the time domain signal.

The FFT info bit field is used to indicate whether the first device feeds back an FFT map. Alternatively, the FFT info bit field may be implemented with 1 bit. The value of the FFT info bit field is '0', which indicates that the first equipment does not need to feed back the FFT map; the value of the FFT info bit field is '1', which indicates that the first device needs to feed back the FFT map.

The FFT result bit field is used for indicating whether the first equipment feeds back the radar test result. Alternatively, the FFT result bit field may be implemented with 1 bit. The value of the FFT result bit field is '0', which indicates that the first equipment does not need to feed back a radar test result; the value of the FFT result bit field is '1', which indicates that the first equipment needs to feed back the radar test result.

In this embodiment of the present application, the CSI bit field may also be referred to as a first indication bit field, the before FFT bit field may also be referred to as a second indication bit field, the FFT info bit field may also be referred to as a third indication bit field, and the FFT result bit field may also be referred to as a fourth indication bit field, which is not limited thereto in this embodiment of the present application.

And in the second situation, the beacon frame is used for indicating one or more first devices which are associated with the second device to carry out radar test in a beamforming training stage.

It is understood that the second device may select a first device with radar testing capability from a plurality of first devices associated with the second device to perform radar testing during the beamforming training phase. It should be noted that the first device may establish an association relationship with the second device in the previous BI according to the capability reporting method shown in fig. 13, and enable the second device to know whether the first device has the radar test capability.

Optionally, based on the case two, as shown in fig. 12, a frame structure diagram of a beacon frame provided in the embodiment of the present application is shown. In comparison with the beacon frame shown in fig. 11, the radar unit bit fields of the beacon frame shown in fig. 12 further include the following bit fields: a bitmap offset value, and a partial virtual bitmap.

It is understood that in a case, the beacon frame may not include the indication information. In case two, the beacon frame must include indication information.

S202, the target first device sends one or more second type scanning frames in a beamforming training stage.

For the beacon frame in case one, the target first device is the first device with radar testing capability. For the beacon frame in case two, the target first device is determined according to the indication information carried by the beacon frame.

The detailed description of step S202 may refer to the embodiment shown in fig. 3, and is not repeated herein.

It will be appreciated that the first device that does not perform radar testing performs beamforming training in a conventional manner. That is, the first device that does not perform radar testing transmits one or more first type scan frames during the beamforming training phase.

Based on the technical scheme shown in fig. 10, the second device sends a beacon frame to trigger the first device to perform radar test in the beamforming training stage, so as to support the implementation of radar test in the WLAN.

As shown in fig. 13, a capability reporting method provided in this embodiment of the present application includes the following steps:

s301, the first device sends an Association Request (Association Request) frame to the second device, so that the second device receives the Association Request frame sent by the first device.

The association request frame is used for establishing an association relationship between the first device and the second device.

In addition, the association request frame is further used for indicating whether the first device has radar test capability. It will be appreciated that a first device having radar testing capabilities is capable of radar testing; a first device that does not have radar testing capability is not capable of radar testing.

As one implementation, the association request frame sent by the first device with radar testing capability contains radar testing capability information. The association request frame sent by the first device without radar test capability does not contain radar test capability information.

Optionally, the radar test capability information is used to indicate that the first device has radar test capability. Further, the radar test capability information may also be used to indicate relevant information of the first device for radar testing, such as: a radar type supported by the first device. Wherein the radar types include: single station radar, double station radar, multi station radar.

In this embodiment, the radar test capability information may be carried in a separate field in the association request frame. For example, radar capability (radar capability) field is used in a directional multi-gigabit (DMG)/enhanced directional multi-gigabit (EDMG) capability unit (capabilities element) in the association request frame to carry radar test capability information. Exemplarily, fig. 14 shows a schematic structural diagram of an EMDG capability element in the embodiment of the present application.

Thus, if the association request frame includes the radar capability field, it indicates that the association request frame includes radar test capability information; and if the association request frame does not comprise the radar capability field, indicating that the association request frame does not comprise the radar test capability information.

S302, the second equipment determines whether the first equipment has radar testing capability according to the association request frame.

As an implementation manner, if the association request frame includes radar test capability information, the second device may determine that the first device has radar test capability; if the association request frame does not contain radar testing capability information, the second device can determine that the first device does not have radar testing capability.

Based on the technical solution shown in fig. 13, the first device sends an association request frame to the second device in an association stage, where the association request frame may be used to indicate whether the first device has radar test capability. Therefore, the second equipment can know whether the first equipment can carry out the radar test or not according to the association request frame, so that the second equipment is prevented from scheduling the first equipment without the radar test capability to carry out the radar test, and the normal execution of the radar test process is ensured.

In addition, the technical scheme shown in fig. 13 can make the reporting process of the radar capability compatible with the existing association process, so that the first device does not need to execute additional steps.

After the radar test is performed based on the method shown in fig. 3 or fig. 10, as shown in fig. 15, a method for feeding back radar test data provided by an embodiment of the present application includes the following steps:

s401, the first device sends radar test data to the second device in the first SP, so that the second device receives the radar test data sent by the first device in the first SP.

Wherein the first SP is an SP for feeding back radar test data.

Alternatively, the determination procedure of the first SP may refer to steps S501 to S502.

S501, the second device sends a polling (poll) frame to the first device in the ATI stage, so that the first device receives the polling frame sent by the second device in the ATI stage. Wherein the polling frame is used to trigger the first device to transmit the SPR frame.

S502, the first device sends a Service Period Request (SPR) frame to the second device in the ATI stage, so that the second device receives the SPR frame sent by the first device in the ATI stage.

Wherein the SPR frame is used to request the second device to assign the first SP to the first device. Alternatively, the SPR frame is used to request feedback of radar test data.

Alternatively, as shown in fig. 16, it is a schematic diagram of a frame structure of an SPR frame. The SPR frame comprises the following bit fields: frame control (frame control), duration (duration), Receiving Address (RA), Transmitting Address (TA), dynamic allocation info (dynamic allocation info), beamforming control (BF control), and Frame Check Sequence (FCS).

Wherein, the dynamic allocation information bit field at least comprises the following bit fields: traffic Identifier (TID), allocation type (allocation type), source (source) AID, destination (destination) AID, allocation duration (allocation duration), and reserved (reserved).

Compared with the SPR frame in the prior art, the SPR frame provided in the embodiment of the present application has a new combination (or referred to as a value) in the allocation type bit field to indicate that the SPR frame is used to request the second device to allocate the SP for feeding back the radar test data to the first device.

It should be noted that the allocation type Bit field is composed of 3 bits, the first Bit may be denoted as Bit4, the second Bit may be denoted as Bit5, and the third Bit may be denoted as Bit 6.

For example, for the SPR frame provided in the embodiment of the present application, the values and corresponding meanings of the bits in the allocation type bit field may refer to table 10.

Watch 10

In table 9, when the value of the allocation type bit field is "001", the SPR frame is used to request the second device to allocate an SP for feeding back radar test data to the first device.

It is understood that other preset values (e.g., "111") may be adopted in the allocation type bit field of the SPR frame to mean "Radar-SP for Radar data feedback".

S503, the second device sends an announcement (announce) frame to the first device in the ATI stage, so that the first device receives the announcement frame sent by the first device in the ATI stage.

Wherein the announcement frame includes information of the first SP.

Based on the technical scheme shown in fig. 15, the first device sends radar test data to the second device at a predetermined first SP, so that the second device can acquire the radar test data.

The technical solutions shown in fig. 10, 13 and 15 will be specifically described below by way of example with reference to fig. 17.

As shown in fig. 17, in the BTI phase, the AP sends a beacon frame to STA1 to instruct STA1 to perform radar testing during the beamforming training phase.

During the a-BFT phase, STA1 transmits a second type of scan frame in the form of a sector scan. Thereafter, the AP executes SSW feedback. STA1 performs an SSW ACK.

In the ATI stage, if STA1 does not have an association relationship with the AP, STA1 and the AP send an association request frame to each other to establish an association request frame between STA1 and the AP. Meanwhile, the association request frame transmitted by the STA1 may include radar test capability information so that the AP knows that the STA1 has radar test capability. If the STA1 has an association relationship with the AP, the process of sending the association request frame between the STA1 and the AP may be omitted.

During the ATI phase, the AP may send a poll frame to STA 1. STA1 then sends an SPR frame to the AP requesting the AP to allocate an SP for feeding back radar test data. The AP sends an announcement frame to the STA1, which includes information of SPs for feeding back radar test data.

During the DTI phase, the STA1 actively feeds back radar test data within the SP for feeding back radar test data.

As shown in fig. 18, a radar testing method provided in the embodiment of the present application includes the following steps:

s601, the second device sends a first indication frame to M first devices, so that the M first devices receive the first indication frame.

Optionally, the M first devices each have a radar testing capability. It is understood that the second device may determine whether a first device has radar testing capability according to the solution shown in fig. 13.

As an implementation, the second device sends a first indication frame to the M first devices during the ATI phase. Correspondingly, each of the M first devices receives the first indication frame sent by the second device in the ATI stage. M is a positive integer.

Wherein the first indication frame is used for indicating scheduling information of radar test. The scheduling information of the radar test comprises one of the following parameters: radar data feedback type, radar SP information and radar transceiving control information.

The information of the radar SP includes at least information of the second SP and information of the third SP. Wherein the second SP is an SP for radar testing. The third SP is an SP for feeding back radar test data. The information of the radar SP may include: time domain resources of the second SP, time domain resources of the third SP, and the like.

The radar transceiving control information is used for indicating the function of each of the M first devices in the radar test process. Or, the radar transceiving control information is used to indicate whether each of the M first devices is a receiving end or a transmitting end of the radar. Or, the radar transceiving control information is used to indicate a first device, which is a radar receiving end, of the M first devices and a first device, which is a radar transmitting end.

Optionally, the first indication frame further includes a radar test type. The radar test types include: single station radar testing and multi-station radar testing.

Optionally, as shown in fig. 19, a schematic diagram of a frame structure of a first indication frame provided in the embodiment of the present application is provided. Wherein the first indication frame comprises at least one of the following bit fields: frame control, duration, transmit address, receive address, radar test type, radar element (radar element), and frame check sequence.

The radar unit bit fields include at least the following bit fields: radar parameters, radar SP, and radar transmit/receive control (radar sensor/receiver control). The radar parameter bit field may refer to the related description above (for example, the related description of the radar parameter bit field in the beacon frame shown in fig. 12), and is not described herein again. The radar SP bit field is used to carry information of the radar SP. The radar transmit/receive control bit field is used to carry radar information.

S602, the M first devices respectively send first response frames to the second device, so that the second device accepts the first response frames sent by the M first devices respectively.

Wherein the first response frame is used for responding to the first indication frame. In other words, the first response frame is used to indicate that the first device has received the first indication frame.

As one implementation, for each of the M first devices, the first device sends a first response frame to the second device during the ATI phase. Correspondingly, the second device receives the first response frame sent by the first device in the ATI phase.

S603, the second device sends a second indication frame to the N first devices, so that the N first devices receive the second indication frame sent by the second device.

The second indication frame is used for indicating the N first devices to carry out radar test. Alternatively, the second indication frame may be implemented in the form of a trigger frame.

It should be noted that the N first devices are a subset of the M first devices. N is a positive integer less than or equal to M.

As an implementation manner, the second device sends a second indication frame to N first devices in a second SP. Correspondingly, each of the N first devices receives, in the second SP, the second indication frame sent by the second device.

And S604, the N first devices carry out radar test according to the scheduling information of the radar test.

As one implementation, the N first devices perform radar testing within a second SP. Specifically, for any one of the N first devices, if the first device is used as a sending end of a radar, the first device sends a radar signal in a sector scanning manner; if the first device serves as a receiving end of the radar, the first device receives the radar signal in a quasi-omnidirectional mode.

Optionally, after the N first devices complete the radar test, each of the N first devices may send a second response message to the second device, where the second response message is used to indicate that the first device has completed the radar test.

It should be noted that, in the second SP, step S603 and step S604 may be executed a plurality of times. That is, the second device may transmit the second indication frame to the N first devices multiple times, so that the N first devices perform multiple rounds of radar tests. Optionally, in the multi-round radar test process, the first device as the radar sending end may be different. For example, during the first round of radar testing, STA1 transmits radar signals and STA2 and STA3 receive radar signals. In the second round of radar testing, STA2 sent radar signals, and STA3 and STA4 received radar signals.

Based on the technical solution shown in fig. 18, the second device sends the first indication frame, so that the plurality of first devices acquire scheduling information of the radar test. And then, the second equipment sends a second indication frame to the first equipment to uniformly schedule the plurality of first equipment to carry out radar test according to the scheduling information of the radar test, so that the multi-station radar test is realized.

After the radar test is performed based on the method shown in fig. 18, as shown in fig. 20, a method for feeding back radar test data provided by the embodiment of the present application includes the following steps:

s701, the second device sends a third indication frame to the first device executing the radar test, so that the first device executing the radar test receives the third indication frame.

Wherein the third indication frame is used for indicating the first device which executes the radar test to feed back radar test data. Alternatively, the third indication frame may be implemented in the form of a trigger frame or a polling frame.

As an implementation manner, the second device sends a third indication frame to the first device performing the radar test in a third SP. Correspondingly, the first device performing the radar test receives a third indication frame sent by the second device in a third SP.

S702, the first device executing the radar test sends radar test data to the second device, so that the second device receives the radar test data.

As one implementation, the first device performing the radar test sends radar test data to the second device within the third SP. Correspondingly, the second device receives the radar test data sent by the first device executing the radar test in the third SP.

Based on the technical solution shown in fig. 20, the second device sends the third indication frame to the first device, so that the first device feeds back radar test data. Therefore, after the plurality of first devices feed back the radar test data, the second device can synthesize the radar test data fed back by the plurality of first devices, and effectively analyze the relevant information (such as the spatial position) of the object to be tested.

The technical solutions shown in fig. 18 and 20 are specifically described below by way of example with reference to fig. 21.

As shown in fig. 21, in the ATI phase, the AP transmits a first indication frame to STA1, STA2, and STA 3; thereafter, STA1, STA2, and STA3 transmit first response frames to the AP, respectively.

In the second SP, after the AP transmits the second indication frame to STA1, STA2, and STA3 for the first time, STA1 transmits radar signals in a sector sweep manner, and STA2 and STA3 receive radar signals in a quasi-omni manner. After the AP transmits the second indication frame to STA, STA2, and STA3 for the second time, STA2 transmits radar signals in a sector sweep and STA1 and STA3 receive radar signals in a quasi-omni manner. After the AP transmits the second indication frame to STA, STA2 and STA3 for the third time, STA3 transmits radar signals in a sector sweep, and STA1 and STA2 receive radar signals in a quasi-omni manner.

At the third SP, the AP transmits a third indication frame to STA1, STA2, and STA3, respectively; STA1, STA2, and STA3 each transmit radar test data to the AP.

The above-mentioned scheme provided by the embodiment of the present application is mainly introduced from the perspective of interaction between each network element. It will be appreciated that each network element, e.g. the first device and the second device, comprises respective hardware structures and/or software modules for performing each function in order to implement the above-described functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, functional modules of the apparatus may be divided according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given by taking the case of dividing each function module corresponding to each function:

fig. 22 is a schematic structural diagram of a communication device according to an embodiment of the present application. As shown in fig. 22, the communication apparatus includes: a processing unit 101 and a communication unit 102.

(1) If the communication apparatus serves as the first device, the communication apparatus may perform the following first scheme or second scheme.

Scheme I,

A processing unit 101 for generating a second type of scan frame, the second type of scan frame comprising radar signals. A communication unit 102, configured to send one or more second type scan frames in a beamforming training phase.

In one possible design, the processing unit 101 is further configured to determine the number of second type scan frames to be transmitted according to the FSS value.

In one possible design, the processing unit 101 is specifically configured to determine the number of sending second-type scan frames according to the FSS value and the first corresponding relationship; wherein the first corresponding relationship is a corresponding relationship between the FSS value and the number of the second type of scanning frames.

Optionally, the second type scanning frame is a second type sector scanning SSW frame, or a second type short sector scanning short SSW frame. The first correspondence may be as shown in table 2 above.

In a possible design, the processing unit 101 is specifically configured to determine the number of transmissions of the second type scan frame according to the FSS value and the time length of the radar signal.

In one possible design, the processing unit 101 is specifically configured to determine the number of sending second type scan frames according to the FSS value, the length type of the radar signal, and the second correspondence; and the second corresponding relation is the corresponding relation among the FSS value, the length type of the radar signal and the sending number of the second type scanning frames.

In one possible design, the communication unit 102 is further configured to receive a beacon frame sent by the second device, where the beacon frame includes radar test information.

In one possible design, the communication unit 102 is further configured to send the radar test data to the second device within a first SP, where the first SP is an SP for feeding back the radar test data.

In one possible design, the communication unit 102 is further configured to send an association request frame to the second device, where the association request frame is used to indicate whether the first device has radar test capability.

Scheme II,

A communication unit 102, configured to receive a first indication frame sent by a second device, where the first indication frame is used to indicate scheduling information of a radar test; sending a first response frame to the second device, wherein the first response frame is used for responding to the first indication frame; and receiving a second indication frame sent by the second equipment, wherein the second indication frame is used for indicating the first equipment to carry out radar test. And the processing unit 101 is configured to perform a radar test according to the scheduling information of the radar test.

In one possible design, the communication unit 102 is specifically configured to receive, in the second SP, a second indication frame sent by the second device.

In one possible design, the communication unit 102 is specifically configured to perform the radar test in the second SP according to the scheduling information of the radar test.

In a possible design, the processing unit 101 is specifically configured to send a radar signal in a sector scanning manner if the first device serves as a sending end of a radar; and if the first equipment is used as a receiving end of the radar, receiving the radar signal in a quasi-omnidirectional manner.

In one possible design, the communication unit 102 is further configured to send, to the second device, second response information in the second SP, where the second response information is used to indicate that the first device has completed the radar test.

In a possible design, the communication unit 102 is further configured to receive third indication information sent by the second device, where the third indication information is used to indicate the first device to feed back radar test data; and sending the radar test data to the second device.

In one possible design, the communication unit 102 is specifically configured to receive, in the third SP, third indication information sent by the second device.

In one possible design, the communication unit 102 is specifically configured to send radar test data to the second device within the third SP.

(2) If the communication apparatus serves as the second device, the communication apparatus may perform the following third or fourth aspect.

Scheme III,

A processing unit 101 configured to generate a beacon frame, which includes radar test information. A communication unit 102 configured to transmit a beacon frame to one or more first devices.

In one possible design, there is a correspondence between the number of transmissions of the second type of scan frame and the FSS value. The correspondence relationship can refer to table 2 above.

In a possible design, the communication unit 102 is further configured to receive, in a first SP, radar test data sent by the first device, where the first SP is an SP for feeding back the radar test data.

In a possible design, the communication unit 102 is further configured to receive an association request frame sent by the first device, where the association request frame is used to indicate whether the first device has radar test capability. The processing unit 101 is further configured to determine whether the first device has radar testing capability according to the association request frame.

Scheme IV,

The processing unit 101 is configured to generate a first indication frame. A communication unit 102, configured to send a first indication frame to M first devices, where the first indication frame is used to indicate scheduling information of a radar test, and M is a positive integer; respectively receiving a first response frame sent by each of the M first devices, wherein the first response frame is used for responding to the first indication frame; and sending a second indication frame to the N first devices, wherein the second indication frame is used for indicating the first devices to carry out radar test, the N first devices are subsets of the M first devices, and N is a positive integer less than or equal to M.

In one possible design, the communication unit 102 is specifically configured to send the second indication frame to N first devices in the second SP.

In one possible design, the communication unit 102 is specifically configured to receive, in the second SP, second response information sent by the first device, where the second response information is used to indicate that the first device has completed the radar test.

In a possible design, the communication unit 102 is further configured to send third indication information to the first device, where the third indication information is used to indicate that the first device feeds back radar test data; and receiving radar test data sent by the first equipment.

In one possible design, the communication unit 102 is specifically configured to send the third indication information to the first device in the third SP.

In one possible design, the communication unit 102 is specifically configured to receive, in the third SP, radar test data transmitted by the first device.

In a possible design, the communication unit 102 is further configured to receive an association request frame sent by a third device, where the association request frame is used to indicate whether the first device has radar test capability. The processing unit 101 is further configured to determine whether the first device has radar testing capability according to the association request frame.

The communication device provided in the embodiments of the present application may be implemented in various product forms, for example, the communication device may be configured as a general processing system; as another example, the communication means may be implemented by a general bus architecture; for example, the communication device may be implemented by an Application Specific Integrated Circuit (ASIC). Several possible product forms of the communication device according to the embodiment of the present application are provided below, and it should be understood that the following product forms are merely examples and do not limit the possible product forms of the communication device according to the embodiment of the present application.

Fig. 23 is a result diagram of possible product configurations of the communication device according to the embodiment of the present application.

As a possible product form, the communication apparatus according to the embodiment of the present application may be a communication device, and the communication device includes a processor 201 and a transceiver 202. Optionally, the communication device further comprises a storage medium 203.

When the communication device is a first device, the processor 201 is configured to execute step S101 in fig. 3, and the transceiver 202 is configured to execute step S102 in fig. 3. Alternatively, the transceiver 202 is configured to perform steps S201 and S202 in fig. 10. Alternatively, the transceiver 202 is configured to execute step S301 in fig. 13. Alternatively, the transceiver 202 is configured to perform steps S501, S502, S503 and S401 in fig. 15. Alternatively, the transceiver 202 is configured to execute steps S601, S602, and S603 in fig. 18, and the processor 201 is configured to execute step S604 in fig. 18. Alternatively, the transceiver is configured to perform steps S701 and S702 in fig. 20.

When the communication device is a second device, the transceiver 202 is configured to execute step S201 in fig. 10. Alternatively, the transceiver 202 is configured to execute step S301 in fig. 13, and the processor 201 is configured to execute step S302 in fig. 13. Alternatively, the transceiver 202 is configured to perform steps S501, S502, S503 and S401 in fig. 15. Alternatively, the transceiver 202 is configured to perform steps S601, S602, and S603 in fig. 18. Alternatively, the transceiver is configured to perform steps S701 and S702 in fig. 20.

As another possible product form, the communication device according to the embodiment of the present application may also be implemented by a general-purpose processor or a special-purpose processor, which is also called a chip. The chip includes: a processing circuit 201 and a transceiver pin 202. Optionally, the chip may further comprise a storage medium 203.

When the chip is used in a first device, the processing circuit 201 is configured to execute step S101 in fig. 3, and the transceiver pin 202 is configured to execute step S102 in fig. 3. Alternatively, the transceiver pin 202 is used to execute steps S201 and S202 in fig. 10. Alternatively, the transceiver pin 202 is used to execute step S301 in fig. 13. Alternatively, the transceiver pin 202 is used to execute steps S501, S502, S503 and S401 in fig. 15. Alternatively, the transceiver pin 202 is configured to execute steps S601, S602, and S603 in fig. 18, and the processing circuit 201 is configured to execute step S604 in fig. 18. Alternatively, the transceiver pin is used to execute steps S701 and S702 in fig. 20.

When the chip is used in a second device, the transceiver pin 202 is used to execute step S201 in fig. 10. Alternatively, the transceiver pin 202 is configured to execute step S301 in fig. 13, and the processing circuit 201 is configured to execute step S302 in fig. 13. Alternatively, the transceiver pin 202 is used to execute steps S501, S502, S503 and S401 in fig. 15. Alternatively, the transceiver pin 202 is used to execute steps S601, S602, and S603 in fig. 18. Alternatively, the transceiver pin is used to execute steps S701 and S702 in fig. 20.

As another possible product form, the communication apparatus according to the embodiment of the present application may also be implemented using the following circuits or devices: one or more Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (PLDs), controllers, state machines, gate logic, discrete hardware components, any other suitable circuitry, or any combination of circuitry capable of performing the various functions described throughout this application.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of radar testing, the method comprising:

generating, by a first device, a second type of scan frame, the second type of scan frame comprising radar signals;

and the first equipment sends one or more second type scanning frames in a beamforming training stage.

2. The radar testing method of claim 1, further comprising:

and the first equipment determines the sending number of the second type scanning frames according to the FSS value.

3. The radar testing method of claim 2, wherein determining, by the first device, the number of transmissions of the second type of scan frame based on the FSS value comprises:

the first equipment determines the sending number of the second type scanning frames according to the FSS value and the first corresponding relation; wherein the first corresponding relationship is a corresponding relationship between the FSS value and the number of the second type of scanning frames.

4. The radar testing method of claim 3, wherein the second type sweep frame is a second type Sector Sweep (SSW) frame or a second type short sector sweep (short SSW) frame;

the first correspondence may be as shown in the following table:

wherein a, B, C, D, E, F, G, H, I, J, K, L, N, M, O, P, A, B, C, D, E, F, G, H, I, J, K, L, N, M, O and P are integers which are more than or equal to 0.

5. The radar testing method of claim 3 or 4, wherein the time length of the radar signal in the second type of scan frame is determined according to the following formula:

6. The radar testing method of claim 2, wherein determining, by the first device, the number of transmissions of the second type of scan frame based on the FSS value comprises:

and the first equipment determines the sending number of the second type scanning frames according to the FSS value and the time length of the radar signal.

7. The radar testing method of claim 6, wherein the number of transmissions of the second type of scan frame is determined according to the following equation:

wherein m represents the number of transmitted second-type scan frames, TXTIME (radar signal) represents the time length of radar signals, TXTIME (first-type scan frame) represents the time length of first-type scan frames, SBIFS represents the short beam forming inter-frame interval, and x represents the number of transmitted first-type scan frames corresponding to the FSS value.

8. The radar testing method of claim 2, wherein determining, by the first device, the number of transmissions of the second type of scan frame based on the FSS value comprises:

the first equipment determines the sending number of the second type scanning frame according to the FSS value, the length type of the radar signal and the second corresponding relation; and the second corresponding relation is the corresponding relation among the FSS value, the length type of the radar signal and the sending number of the second type scanning frames.

9. The radar testing method of claim 2, wherein if the number of transmissions of the second type of scan frame is the same as the number of transmissions of the first type of scan frame for the same FSS value, the sector sweep time slot is determined according to the following equation:

10. The radar testing method of any one of claims 1 to 9, further comprising:

the first device receives a beacon frame sent by a second device, wherein the beacon frame comprises radar test information.

11. The radar testing method of claim 10, wherein the radar test information includes at least one of the following parameters: the radar data feedback type, the length type of the radar signal and the indication information;

the radar data feedback type is used for indicating radar test data to be fed back;

the length type of the radar signal is used for determining the time length of the radar signal;

the indication information is used for indicating one or more first devices needing radar test.

12. The radar testing method of any one of claims 1 to 11, further comprising:

the first equipment sends radar test data to second equipment in a first service interval SP, and the first SP is used for feeding back the radar test data.

13. The radar testing method of any one of claims 1 to 11, further comprising:

the first device sends an association request frame to a second device, wherein the association request frame is used for indicating whether the first device has radar test capability or not.

14. A communication apparatus, characterized by comprising means for performing the radar testing method of any of claims 1 to 13.

15. A communication device comprising a processor and a transceiver;

the processor is configured to generate a second type of scan frame, the second type of scan frame including radar signals;

the transceiver is configured to send one or more second-type scan frames during a beamforming training phase.

16. A computer-readable storage medium storing instructions that, when read by a computer, perform the radar testing method of any one of claims 1 to 13.

17. A computer program product, characterized in that it comprises instructions which, when read by a computer, cause the computer to carry out the radar testing method according to any one of claims 1 to 13.

18. A chip, comprising processing circuitry and transceiver pins;

the processing circuit is configured to generate a second type of scan frame, where the second type of scan frame includes radar signals;

and the transceiver pin is used for sending one or more second-type scanning frames in a beamforming training stage.