Radio Frequency Sensing Method and Related Device

Abstract

This application relates to the field of wireless communication, and in particular, to a radio frequency sensing method and related devices. The method includes: a first device sending a plurality of first frames including first indication information for indicating a second device to evaluate a change amount of the channel state information (CSI) from the first device to the second device; the first device quasi-omnidirectionally receiving a plurality of second frames including a first measurement result and second indication information, the first measurement result being used to feedback a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information being used to indicate the first device to evaluate a change amount of the CSI from the second device to the first device; the first device sending a third frame including a second measurement result for feedbacking a transmission beam for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold. By adopting the embodiment of this application, a beamforming training mechanism can be combined with WLAN sensing to achieve sensing while performing communication beam training.

Description

Technical Field

[0001] This application relates to the field of wireless communication technologies, and in particular, to a radio frequency sensing method and related devices. Background Art

[0002] In daily life, signals emitted by transmitters are usually received after being reflected, diffracted, and scattered by various obstacles. This phenomenon makes the actually received signals often a superposition of multiple signals. Therefore, wireless signals can sense the physical environment they pass through. By analyzing the wireless signals "modulated" by various obstacles, the surrounding environment can be inferred, from which the wireless local area network (WLAN) sensing technology is derived.

[0003] WLAN sensing is a technology with broad application prospects. It can use the currently widely deployed WLAN devices to send specific data or communication channel detection frames to sense the surrounding environment, then receive signal echoes or feedback information generated by peer devices in the wireless network, and then extract corresponding parameters in the received signals through a certain algorithm for analysis to obtain the surrounding environment information. Although the existing sensors on the market can also provide environmental control feedback, these sensors require special installation. WLAN sensing can use the existing network to generate the same feedback without the need to build and maintain multiple systems.

[0004] The 60 GHz millimeter-wave band has rich available spectrum resources. However, due to the increased path loss and very serious attenuation, the 802.11ad / ay standard mainly considers using the directional communication technology of beamforming (BF). To adopt the beamforming technology, beamforming training (BFT) needs to be carried out first. Future 802.11 standards consider introducing WLAN sensing into the beamforming training mechanism. However, how to combine the traditional beamforming training mechanism with WLAN sensing to perform WLAN sensing without affecting normal communication has become an urgent problem to be solved. Summary of the Invention

[0005] Embodiments of this application provide a radio frequency sensing method and related devices, which can combine the traditional beamforming training mechanism in 802.11ay with WLAN sensing to realize sensing and training of the beam for sensing while performing the original communication beam training, without the need to specifically design relevant processes for sensing and training the sensing beam, with relatively small overhead and good compatibility.

[0006] The present application will be introduced from different aspects below. It should be understood that the implementation manners and beneficial effects of the different aspects below can be referred to each other.

[0007] In a first aspect, the present application provides a radio frequency sensing method, which includes a sector-level scanning stage, wherein: a first device sends a plurality of first frames in a sector scanning manner, and each first frame includes first indication information for indicating a second device to evaluate a change amount of channel state information (CSI) from the first device to the second device; the first device quasi-omnidirectionally receives a plurality of second frames, and each second frame includes a first measurement result and second indication information, the first measurement result is used to feedback a transmission beam whose change amount of CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information is used to indicate the first device to evaluate a change amount of CSI from the second device to the first device; the first device sends a third frame, and the third frame includes a second measurement result, and the second measurement result is used to feedback a transmission beam whose change amount of CSI from the second device to the first device is greater than the CSI change threshold.

[0008] Wherein, the first device may be an initiator, and the second device is a responder. The first device scans at least 2 circles in sectors, that is, the first device sends at least 2 times (sending one first frame each time) using the same transmission beam. It should be understood that a sector identification (Sector ID) field and a directional multi-gigabit (DMG) antenna identification (DMG Antenna ID) field are set in each first frame, which are respectively used to indicate the transmission sector and transmission antenna of the first frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0009] It can be seen that this solution is based on the sector-level scanning stage process of the 802.11ay standard, senses by the change of CSI values measured by multiple scans with the same beam, and enables the sensing operation, feedback of sensing measurement results, etc. by modifying the relevant frame structure of the sector-level scanning stage. It can realize the sensing of a single moving target and the training of the transmission beam for sensing while the original communication beam is trained, without specially designing relevant processes for sensing and training the sensing transmission beam, with less overhead and better compatibility.

[0010] In combination with the first aspect, in a possible design, after the first device sends the third frame, the method further includes a multi-sector detection process, where: the first device quasi-omnidirectionally sends the first beam refinement protocol (BRP) physical layer protocol data unit (PPDU) multiple times, and the first BRP frame included in the first BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the first device receives the second BRP PPDU multiple times in a sector scanning manner, and the second BRP frame included in the second BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the first device sends a third BRP frame, and the third BRP frame is used to feedback the number of first received beams in the beam training of the first device in the beam pairing phase, and the number of first received beams is the number of received beams in all received beams of the first device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold; the first device receives a fourth BRP frame, and the fourth BRP frame is used to feedback the number of second received beams in the beam training of the second device in the beam pairing phase, and the number of second received beams is the number of received beams in all received beams of the second device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold.

[0011] Wherein, the first device quasi-omnidirectionally sends one first BRP PPDU each time, and each first BRP PPDU includes a first BRP frame and a training unit (TRN Unit). Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement. The first device sector scans at least 2 circles, that is to say, the first device receives at least 2 times (receiving one first BRP PPDU each time) using the same received beam.

[0012] It can be seen that in this solution, by modifying the relevant frame format in the multi-sector detection process, the transceiver can train and sense the best received beam in the scenario.

[0013] In combination with the first aspect, in a possible design, after the first device receives the fourth BRP frame, the method further includes a beam pairing process, where: the first device transmits the fifth BRP PPDU in multiple directions, and the fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the first device receives the sixth BRP PPDU in multiple directions, and the sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the first device transmits a seventh BRP frame carrying a first beam information list, and the first beam information list is used to feedback multiple transmit beams whose CSI change amount from the second device to the first device is greater than the CSI change threshold and the receive antenna corresponding to each transmit beam; the first device receives an eighth BRP frame carrying a second beam information list, and the second beam information list is used to feedback multiple transmit beams whose CSI change amount from the first device to the second device is greater than the CSI change threshold and the receive antenna corresponding to each transmit beam.

[0014] Wherein, each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0015] It can be seen that this solution is based on the sector-level scanning stage and beam refinement stage processes of the 802.11ay standard. It senses by the change of the CSI value measured by scanning the same beam multiple times, and enables the sensing operation, feedback of sensing measurement results, etc. by modifying the relevant frame structures in the sector-level scanning stage and beam refinement stage. It can realize the sensing of a single moving target and the training of the best transceiver beams for sensing while the original communication beam training is in progress, without specially designing relevant processes for sensing and training sensing beams, with less overhead and better compatibility.

[0016] In a second aspect, the present application provides a radio frequency sensing method. The method includes a sector-level scanning phase, where: The second device omni-directionally receives a plurality of first frames, and each first frame includes first indication information for indicating the second device to evaluate the change amount of the CSI from the first device to the second device; The second device sends a plurality of second frames in a sector scanning manner, and each second frame includes a first measurement result and second indication information. The first measurement result is used to feedback a transmission beam whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold, and the second indication information is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; The second device receives a third frame, and the third frame includes a second measurement result, which is used to feedback a transmission beam whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

[0017] Wherein, the first device may be an initiator, and the second device is a responder. The second device sector scans at least 2 circles, that is, the second device uses the same transmission beam to send at least 2 times (sending one second frame each time). It should be understood that a Sector ID field and a DMG Antenna ID field are set in each second frame, which are respectively used to indicate the transmission sector and the transmission antenna of the second frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0018] In combination with the second aspect, in a possible design, after the second device receives the third frame, the method further includes a multi-sector detection process, where: The second device receives a plurality of first BRP PPDUs in a sector scanning manner. The first BRP frame included in the first BRP PPDU is used to indicate the second device to evaluate the change amount of the CSI from the first device to the second device; The second device omni-directionally sends a plurality of second BRP PPDUs. The second BRP frame included in the second BRP PPDU is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; The second device receives a third BRP frame, which is used to feedback the number of first received beams in the beam training of the first device in the beam pairing phase. The number of first received beams is the number of received beams among all the received beams of the first device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold; The second device sends a fourth BRP frame, which is used to feedback the number of second received beams in the beam training of the second device in the beam pairing phase. The number of second received beams is the number of received beams among all the received beams of the second device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold.

[0019] Among them, the second device quasi-omnidirectionally sends a second BRP PPDU each time. Each second BRP PPDU includes a second BRP frame and a TRN Unit. Similarly, each first BRP PPDU includes a first BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement. The second device scans at least two circles in the sector, that is to say, the second device receives at least twice (receiving a second BRP PPDU each time) using the same receiving beam.

[0020] Combined with the second aspect, in a possible design, after the second device sends the fourth BRP frame, the method further includes a beam pairing process, where: the second device directionally receives the fifth BRP PPDU multiple times, and the fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the second device directionally sends the sixth BRP PPDU multiple times, and the sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the second device receives the seventh BRP frame carrying the first beam information list, and the first beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam; the second device sends the eighth BRP frame carrying the second beam information list, and the second beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam.

[0021] Among them, each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0022] In a third aspect, the present application provides a first device or a chip in the first device, such as a Wi-Fi chip. The first device includes: a sending unit configured to send a plurality of first frames, each first frame including first indication information for instructing a second device to evaluate a change amount of the CSI from the first device to the second device; a receiving unit configured to omnidirectionally receive a plurality of second frames, each second frame including a first measurement result and second indication information, the first measurement result being used to feedback a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information being used to instruct the first device to evaluate a change amount of the CSI from the second device to the first device; and the sending unit is further configured to send a third frame, the third frame including a second measurement result, the second measurement result being used to feedback a transmission beam for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0023] Optionally, the first device further includes a processing unit configured to generate a plurality of first frames; and the processing unit is further configured to generate a third frame.

[0024] It should be understood that a Sector ID field and a DMG Antenna ID field are set in each first frame, which are respectively used to indicate a transmission sector and a transmission antenna of the first frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0025] In combination with the third aspect, in a possible design, the above-mentioned sending unit is further configured to omnidirectionally send a first BRP PPDU multiple times, the first BRP frame included in the first BRP PPDU being used to instruct the second device to evaluate a change amount of the CSI from the first device to the second device; the above-mentioned receiving unit is further configured to receive a second BRP PPDU multiple times, the second BRP frame included in the second BRP PPDU being used to instruct the first device to evaluate a change amount of the CSI from the second device to the first device; the above-mentioned sending unit is further configured to send a third BRP frame, the third BRP frame being used to feedback a first received beam number in beam training of the first device in a beam pairing phase, the first received beam number being the number of received beams in all received beams of the first device for which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold; and the above-mentioned receiving unit is further configured to receive a fourth BRP frame, the fourth BRP frame being used to feedback a second received beam number in beam training of the second device in a beam pairing phase, the second received beam number being the number of received beams in all received beams of the second device for which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold.

[0026] Optionally, the above-mentioned processing unit is further configured to generate a first BRP PPDU and a third BRP frame.

[0027] Among them, each first BRP PPDU includes a first BRP frame and a TRN Unit. Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0028] Combined with the third aspect, in a possible design, the above-mentioned sending unit is further configured to send the fifth BRP PPDU multiple times, and the fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the above-mentioned receiving unit is further configured to receive the sixth BRP PPDU multiple times, and the sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the above-mentioned sending unit is further configured to send a seventh BRP frame carrying a first beam information list, and the first beam information list is used to feedback multiple sending beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam; the above-mentioned receiving unit is further configured to receive an eighth BRP frame carrying a second beam information list, and the second beam information list is used to feedback multiple sending beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam.

[0029] Optionally, the above-mentioned processing unit is further configured to generate the fifth BRP PPDU and the seventh BRP frame carrying the first beam information list.

[0030] Among them, each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0031] Fourthly, the present application provides a second device or a chip in the second device, such as a Wi-Fi chip. The second device includes: a receiving unit, configured to omnidirectionally receive a plurality of first frames, each first frame including first indication information for indicating the second device to evaluate the change amount of the CSI from the first device to the second device; a sending unit, configured to send a plurality of second frames, each second frame including a first measurement result and second indication information, the first measurement result being used to feedback a transmission beam whose change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information being used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; and the receiving unit is further configured to receive a third frame, the third frame including a second measurement result, the second measurement result being used to feedback a transmission beam whose change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0032] Optionally, the second device further includes a processing unit, configured to generate a plurality of second frames.

[0033] It should be understood that a Sector ID field and a DMG Antenna ID field are set in each second frame, which are respectively used to indicate the transmission sector and the transmission antenna of the second frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0034] In combination with the fourth aspect, in a possible design, the above receiving unit is further configured to receive a first BRP PPDU multiple times, the first BRP frame included in the first BRP PPDU being used to indicate the second device to evaluate the change amount of the CSI from the first device to the second device; the above sending unit is further configured to omnidirectionally send a second BRP PPDU multiple times, the second BRP frame included in the second BRP PPDU being used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; the above receiving unit is further configured to receive a third BRP frame, the third BRP frame being used to feedback the number of first received beams in the beam training of the first device in the beam pairing phase, the number of first received beams being the number of received beams in all received beams of the first device where the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold; the above sending unit is further configured to send a fourth BRP frame, the fourth BRP frame being used to feedback the number of second received beams in the beam training of the second device in the beam pairing phase, the number of second received beams being the number of received beams in all received beams of the second device where the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold.

[0035] Optionally, the above processing unit is further configured to generate a second BRP PPDU and a fourth BRP frame.

[0036] Among them, each second BRP PPDU includes a second BRP frame and a TRN Unit. Similarly, each first BRP PPDU includes a first BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0037] Combined with the fourth aspect, in a possible design, the above receiving unit is further configured to receive the fifth BRP PPDU multiple times. The fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device. The above sending unit is further configured to send the sixth BRP PPDU multiple times. The sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The above receiving unit is further configured to receive a seventh BRP frame carrying a first beam information list. The first beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam. The above sending unit is further configured to send an eighth BRP frame carrying a second beam information list. The second beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam.

[0038] Optionally, the above processing unit is further configured to generate the sixth BRP PPDU and the eighth BRP frame carrying the second beam information list.

[0039] Among them, each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0040] In any one of the designs of any of the above aspects, when the first frame is a beacon frame, the first indication information is located in the optional sub-element sub-field of the enhanced directional multi-gigabit (EDMG) capability field of the beacon frame. The first indication information may include a CSI measurement request field and a CSI difference calculation field. The CSI measurement request field is used to indicate whether the second device measures CSI. When the CSI measurement request field is set to a first value, it is used to indicate that the second device measures CSI; when the CSI measurement request field is set to a second value, it is used to indicate that the second device does not measure CSI. In the first frame of this solution, the CSI measurement request field is set to the first value. The CSI difference calculation field is used to indicate whether the second device calculates the CSI difference. When the CSI difference calculation field is set to a first value, it is used to indicate that the second device calculates CSI; when the CSI difference calculation field is set to a second value, it is used to indicate that the second device does not calculate the CSI difference. Optionally, the first indication information further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field. The evaluation algorithm field is used to indicate the evaluation algorithm of CSI; the CSI change threshold field is used to indicate the CSI change threshold.

[0041] Wherein, the first value is 1 and the second value is 0; or the first value is 0 and the second value is 1.

[0042] It can be seen that in this solution, by carrying the first indication information in the optional sub-element sub-field of the EDMG capability field of the beacon frame to indicate the second device to evaluate the change amount of CSI from the first device to the second device, it is possible to neither change the original function of the beacon frame (or reuse the function of the original beacon frame), nor use the beacon frame to implement the sensing function. There is no need to design relevant processes for the sensing function in the patent, with less overhead and better compatibility.

[0043] In any of the designs of any of the above aspects, when the first frame is a sector sweep (SSW) frame, the first indication information is carried in a reserved subfield of the SSW feedback field of the SSW frame. The first indication information may include a CSI measurement request field and a CSI difference calculation field. The CSI measurement request field is used to indicate whether the second device measures CSI. When the CSI measurement request field is set to a first value, it is used to indicate that the second device measures CSI; when the CSI measurement request field is set to a second value, it is used to indicate that the second device does not measure CSI. In the first frame of this solution, the CSI measurement request field is set to the first value. The CSI difference calculation field is used to indicate whether the second device calculates the CSI difference. When the CSI difference calculation field is set to a first value, it is used to indicate that the second device calculates the CSI; when the CSI difference calculation field is set to a second value, it is used to indicate that the second device does not calculate the CSI difference. Optionally, the first indication information further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field. The evaluation algorithm field is used to indicate the evaluation algorithm of the CSI; the CSI change threshold field is used to indicate the CSI change threshold.

[0044] Wherein, the first value is 1 and the second value is 0; or the first value is 0 and the second value is 1.

[0045] It can be seen that in this solution, by carrying the first indication information in the reserved subfield of the SSW feedback field of the SSW frame, the frame length of the original SSW frame can be unchanged, and other fields in the SSW frame can be reused, so that both the training of communication beams and the training of sensing beams can be realized, with flexible design and good compatibility.

[0046] In any of the designs of any of the above aspects, when the second frame is an SSW frame, the second indication information is located in the reserved subfield of the SSW feedback field of the SSW frame, and the first measurement result is located in the signal-to-noise ratio (SNR) report subfield of the SSW feedback field of the SSW frame. The second indication information includes a CSI difference calculation field, and the CSI difference calculation field is used to indicate whether the first device calculates the CSI difference. When the CSI difference calculation field is set to a first value, it is used to indicate that the first device calculates the CSI; when the CSI difference calculation field is set to a second value, it is used to indicate that the second device does not calculate the CSI difference.

[0047] Wherein, the first value is 1 and the second value is 0; or the first value is 0 and the second value is 1.

[0048] It can be seen that the present solution carries second indication information in the second frame, which is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device, facilitating the training of the optimal sensing transmission beam of the second device and providing a basis for subsequent applications of WLAN sensing.

[0049] In any one of the designs of any of the above aspects, the second frame further includes third indication information, and the third indication information is used to indicate whether the first measurement result is included in the second frame. In the present solution, the third indication information is set to a first value, indicating that the first measurement result is included in the second frame. When the second frame is an SSW frame, the third indication information is located in a reserved subfield of the SSW feedback field of the SSW frame.

[0050] It can be seen that the present solution is more flexible in design by carrying the third indication information in the second frame to indicate whether there is a first measurement result in this second frame.

[0051] In any one of the designs of any of the above aspects, when the third frame is an SSW feedback frame, the second measurement result is located in the SNR report subfield of the SSW feedback field of the SSW feedback frame.

[0052] It can be seen that the present solution multiplexes the SNR report subfield in the SSW feedback frame to carry the second measurement result, with less modification to the SSW feedback frame and better compatibility.

[0053] In any one of the designs of any of the above aspects, the third frame further includes fourth indication information, and the fourth indication information is used to indicate whether the second measurement result is included in the third frame. In the present solution, the fourth indication information is set to a first value, indicating that the second measurement result is included in the third frame. When the third frame is an SSW feedback frame, the fourth indication information is located in a reserved subfield of the SSW feedback field of the SSW frame.

[0054] It can be seen that the present solution is more flexible in design by carrying the fourth indication information in the third frame to indicate whether there is a second measurement result in this third frame.

[0055] In any one of the designs of any of the above aspects, the first measurement result includes a first antenna identifier and a first sector identifier, and the second measurement result includes a second antenna identifier and a second sector identifier. The beam determined by the first antenna identifier and the first sector identifier is the beam among all the transmission beams of the first device where the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold. The beam determined by the second antenna identifier and the second sector identifier is the beam among all the transmission beams of the second device where the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold.

[0056] It can be seen that in this solution, the transmission beams with CSI change amount greater than the threshold among all the transmission beams of the first device are fed back according to the first measurement result as the optimal sensing transmission beams of the first device; the transmission beams with CSI change amount greater than the threshold among all the transmission beams of the second device are fed back according to the second measurement result as the optimal sensing transmission beams of the second device; during the sector-level scanning process of communication, the training of the sensing transmission beams is realized.

[0057] In any of the designs in any of the above aspects, the first BRP frame in the above first BRP PPDU and the second BRP frame in the above first BRP PPDU both include a CSI measurement request field and a beam scanning circle number field. The value of the CSI measurement request field is the first value, which is used to indicate measuring CSI; the beam scanning circle number field is used to indicate the number of scanning circles of the receiving beam.

[0058] Optionally, the first BRP frame in the first BRP PPDU and the second BRP frame in the first BRP PPDU further include one or more of the following fields: a sending end sensing sector identification field and a sending end sensing antenna identification mask field, which are used to jointly indicate the transmitting sector and the transmitting antenna of the BRP frame; a CSI change threshold field, which is used to indicate the CSI change threshold; an evaluation algorithm field, which is used to indicate the CSI evaluation algorithm.

[0059] It can be seen that in this solution, by modifying the frame format of the BRP PPDU during the multi-sector detection process to introduce the sensing operation, the optimal sensing receiving beams of the first device and the second device can be respectively trained, providing a basis for the subsequent application of WLAN sensing.

[0060] In any of the designs in any of the above aspects, the above first receiving beam number is carried in the directional multi-gigabit (DMG) beam refinement element of the above third BRP frame. The above second receiving beam number is carried in the DMG beam refinement element of the fourth BRP frame.

[0061] In any of the designs in any of the above aspects, the fifth BRP frame in the above fifth BRP PPDU and the sixth BRP frame in the above sixth BRP PPDU both include a CSI measurement request field and a beam scanning circle number field. The value of the CSI measurement request field is the first value, which is used to indicate measuring CSI; the beam scanning circle number field is used to indicate the number of scanning circles of the receiving beam.

[0062] Optionally, the fifth BRP frame in the fifth BRP PPDU and the sixth BRP frame in the sixth BRP PPDU further include one or more of the following fields: a transmitter-aware sector identification field and a transmitter-aware antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; a CSI change threshold field, which is used to indicate the CSI change threshold; and an evaluation algorithm field, which is used to indicate the CSI evaluation algorithm.

[0063] It can be seen that in this solution, by modifying the frame format of the BRP PPDU during the beam pairing process to introduce the sensing operation, the best sensing transceiver beams of the first device and the second device can be paired, providing a basis for subsequent WLAN sensing applications.

[0064] In any one of the designs in any of the above aspects, the above first beam information list is located in the sensing measurement feedback element of the seventh BRP frame, and the above second beam information list is located in the sensing measurement feedback element of the eighth BRP frame. Among them, the element identifier of the sensing measurement feedback element is a reserved value, such as 13.

[0065] In any one of the designs in any of the above aspects, the above first beam information list includes the antenna identifier and sector identifier corresponding to the transmit beam in a plurality of transceiver beam pairs in which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold, and the receive antenna identifier corresponding to each transmit beam. Similarly, the above second beam information list includes the antenna identifier and sector identifier corresponding to the transmit beam in a plurality of transceiver beam pairs in which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold, and the receive antenna identifier corresponding to each transmit beam. It should be understood that a transceiver beam pair consists of a transmit beam and a receive beam. An antenna identifier and a sector identifier can be used to uniquely determine a beam. However, since the receive beam is used by the receiving end to receive data, the direction of the receive beam does not need to be informed to the transmitting end and only the receiving end needs to know it. Therefore, the sector identifier of the receive beam may not be included in the first beam information list.

[0066] Fifth aspect, the present application provides a radio frequency sensing method, which includes: a first device sends a plurality of first frames in a sector scanning manner, and each first frame includes first indication information for indicating a second device to evaluate a change amount of the CSI from the first device to the second device; the first device quasi-omnidirectionally receives a plurality of second frames, and each second frame includes second indication information for indicating the first device to evaluate a change amount of the CSI from the second device to the first device; the first device sends a first sensing feedback frame, and the first sensing feedback frame includes a second measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the first device receives a second sensing feedback frame, and the second sensing feedback frame includes a first measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0067] Wherein, the first device may be an initiator, and the second device is a responder. The first device sector scans at least 2 circles, that is, the first device sends at least 2 times (sending one first frame each time) using the same transmission beam. It should be understood that a Sector ID field and a DMG Antenna ID field are set in each first frame, which are respectively used to indicate the transmission sector and the transmission antenna of the first frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0068] It can be seen that this solution solves the problem that multi-target beam information feedback cannot be achieved due to insufficient reserved bits in the sector-level scanning stage by adding a sensing feedback process, thereby realizing the sensing of multiple moving targets and training the optimal transceiver beams for sensing each moving target. There is no need to specifically design relevant processes for sensing and training sensing beams, with relatively small overhead and good compatibility.

[0069] In combination with the fifth aspect, in a possible design, after the first device receives the second sensing feedback frame, the method further includes a multi-sector detection process, where: the first device quasi-omnidirectionally sends the first BRP PPDU multiple times, and the first BRP frame included in the first BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the first device receives the second BRP PPDU multiple times in a sector scanning manner, and the second BRP frame included in the second BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the first device sends a third BRP frame, and the third BRP frame is used to feedback the number of first received beams in the beam pairing phase for beam training of the first device, and the number of first received beams is the number of received beams among all the received beams of the first device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold; the first device receives a fourth BRP frame, and the fourth BRP frame is used to feedback the number of second received beams in the beam pairing phase for beam training of the second device, and the number of second received beams is the number of received beams among all the received beams of the second device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold.

[0070] Wherein, the first device quasi-omnidirectionally sends one first BRP PPDU each time, and each first BRP PPDU includes a first BRP frame and a TRN Unit. Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement. The first device sector scans at least 2 circles, that is to say, the first device receives at least 2 times (receiving one first BRP PPDU each time) using the same received beam.

[0071] It can be seen that in this solution, by modifying the relevant frame format in the multi-sector detection process, the transceiver can train the best received beam in the sensing scenario.

[0072] Combined with the fifth aspect, in a possible design, after the first device receives the fourth BRP frame, the method further includes a beam pairing process, where: the first device sends the fifth BRP PPDU multiple times in a directed manner, and the fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the first device receives the sixth BRP PPDU multiple times in a directed manner, and the sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the first device sends a seventh BRP frame carrying a first beam information list, and the first beam information list is used to feedback multiple transmit beams for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmit beam; the first device receives an eighth BRP frame carrying a second beam information list, and the second beam information list is used to feedback multiple transmit beams for which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmit beam.

[0073] Wherein, each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0074] It can be seen that this solution is based on the sector-level scanning stage and beam refinement stage processes of the 802.11ay standard. It senses by the change of the CSI value measured by scanning the same beam multiple times, and enables the sensing operation, feedback of sensing measurement results, etc. by modifying the relevant frame structures in the sector-level scanning stage and beam refinement stage. It can realize the sensing of a single moving target and the training of the best transceiver beams for sensing while performing the original communication beam training, without specially designing relevant processes for sensing and training sensing beams, with less overhead and good compatibility.

[0075] Sixth aspect, the present application provides a radio frequency sensing method, which includes: the second device omnidirectionally receives multiple first frames, and each first frame includes first indication information for indicating the second device to evaluate the change amount of the CSI from the first device to the second device; the second device sends multiple second frames in a sector scanning manner, and each second frame includes second indication information for indicating the first device to evaluate the change amount of the CSI from the second device to the first device; the second device receives a first sensing feedback frame, and the first sensing feedback frame includes a second measurement result for feedbacking multiple transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold; the second device sends a second sensing feedback frame, and the second sensing feedback frame includes a first measurement result for feedbacking multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold.

[0076] Wherein, the first device may be an initiator, and the second device is a responder. The second device sector scans at least 2 circles, that is to say, the second device sends at least 2 times (sending one second frame each time) using the same transmission beam. It should be understood that a Sector ID field and a DMG Antenna ID field are set in each second frame, which are respectively used to indicate the transmission sector and the transmission antenna of the second frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0077] Combined with the sixth aspect, in a possible design, after the second device sends the second sensing feedback frame, the method further includes a multi-sector detection process, wherein: the second device receives the first BRP PPDU multiple times in a sector scanning manner, and the first BRP frame included in the first BRP PPDU is used to indicate the second device to evaluate the change amount of the CSI from the first device to the second device; the second device omnidirectionally sends the second BRP PPDU multiple times, and the second BRP frame included in the second BRP PPDU is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; the second device receives a third BRP frame, and the third BRP frame is used to feedback the number of first received beams in the beam training of the first device in the beam pairing stage, and the number of first received beams is the number of received beams among all the received beams of the first device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold; the second device sends a fourth BRP frame, and the fourth BRP frame is used to feedback the number of second received beams in the beam training of the second device in the beam pairing stage, and the number of second received beams is the number of received beams among all the received beams of the second device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold.

[0078] Among them, the second device quasi-omnidirectionally sends one second BRP PPDU each time. Each second BRP PPDU includes a second BRP frame and a TRN Unit. Similarly, each first BRP PPDU includes a first BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement. The second device scans at least two circles in the sector, that is, the second device receives at least twice (receiving one second BRP PPDU each time) using the same receiving beam.

[0079] Combined with the sixth aspect, in a possible design, after the first device receives the fourth BRP frame, the method further includes a beam pairing process, where: the second device directionally receives the fifth BRP PPDU multiple times. The fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the second device directionally sends the sixth BRP PPDU multiple times. The sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the second device receives the seventh BRP frame carrying the first beam information list. The first beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antennas corresponding to each transmission beam; the second device sends the eighth BRP frame carrying the second beam information list. The second beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antennas corresponding to each transmission beam.

[0080] Among them, each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0081] In a seventh aspect, the present application provides a first device or a chip in the first device, such as a Wi-Fi chip. The first device includes: a sending unit configured to send a plurality of first frames, each first frame including first indication information for instructing a second device to evaluate a change amount of the CSI from the first device to the second device; a receiving unit configured to omnidirectionally receive a plurality of second frames, each second frame including second indication information for instructing the first device to evaluate a change amount of the CSI from the second device to the first device; the sending unit is further configured to send a first sensing feedback frame, the first sensing feedback frame including a second measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the receiving unit is further configured to receive a second sensing feedback frame, the second sensing feedback frame including a first measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0082] Optionally, the first device further includes a processing unit configured to generate a plurality of first frames; the processing unit is further configured to generate a first sensing feedback frame.

[0083] It should be understood that a Sector ID field and a DMG Antenna ID field are set in each first frame, which are respectively used to indicate the transmission sector and the transmission antenna of the first frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0084] In combination with the seventh aspect, in a possible design, the above-mentioned sending unit is further configured to omnidirectionally send a first BRP PPDU multiple times, the first BRP frame included in the first BRP PPDU is used to instruct the second device to evaluate a change amount of the CSI from the first device to the second device; the above-mentioned receiving unit is further configured to receive a second BRP PPDU multiple times, the second BRP frame included in the second BRP PPDU is used to instruct the first device to evaluate a change amount of the CSI from the second device to the first device; the above-mentioned sending unit is further configured to send a third BRP frame, the third BRP frame is used to feed back a first received beam number in beam training of the first device in a beam pairing phase, the first received beam number is the number of received beams in all received beams of the first device in which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold; the above-mentioned receiving unit is further configured to receive a fourth BRP frame, the fourth BRP frame is used to feed back a second received beam number in beam training of the second device in a beam pairing phase, the second received beam number is the number of received beams in all received beams of the second device in which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold.

[0085] Optionally, the above processing unit is further configured to generate a first BRP PPDU and a third BRP frame.

[0086] Each first BRP PPDU includes a first BRP frame and a TRN Unit. Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0087] In combination with the seventh aspect, in a possible design, the above sending unit is further configured to send the fifth BRP PPDU multiple times, and the fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the above receiving unit is further configured to receive the sixth BRP PPDU multiple times, and the sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the above sending unit is further configured to send a seventh BRP frame carrying a first beam information list, and the first beam information list is used to feedback multiple sending beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam; the above receiving unit is further configured to receive an eighth BRP frame carrying a second beam information list, and the second beam information list is used to feedback multiple sending beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam.

[0088] Optionally, the above processing unit is further configured to generate a fifth BRP PPDU and a seventh BRP frame carrying a first beam information list.

[0089] Each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0090] In an eighth aspect, the present application provides a second device or a chip in the second device, such as a Wi-Fi chip. The second device includes: a receiving unit configured to omnidirectionally receive a plurality of first frames, each first frame including first indication information for instructing the second device to evaluate a change amount of the CSI from the first device to the second device; a transmitting unit configured to transmit a plurality of second frames, each second frame including second indication information for instructing the first device to evaluate a change amount of the CSI from the second device to the first device; the receiving unit is further configured to receive a first sensing feedback frame, the first sensing feedback frame including a second measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the transmitting unit is further configured to transmit a second sensing feedback frame, the second sensing feedback frame including a first measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0091] Optionally, the second device further includes a processing unit configured to generate a plurality of second frames; the processing unit is further configured to generate a second sensing feedback frame.

[0092] It should be understood that an Sector ID field and a DMG Antenna ID field are set in each second frame, which are respectively used to indicate the transmission sector and the transmission antenna of the second frame. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam.

[0093] In combination with the eighth aspect, in a possible design, the above receiving unit is further configured to receive a plurality of first BRP PPDUs, the first BRP frames included in the first BRP PPDUs are used to instruct the second device to evaluate a change amount of the CSI from the first device to the second device; the above transmitting unit is further configured to omnidirectionally transmit a plurality of second BRP PPDUs, the second BRP frames included in the second BRP PPDUs are used to instruct the first device to evaluate a change amount of the CSI from the second device to the first device; the above receiving unit is further configured to receive a third BRP frame, the third BRP frame is used to feed back a first received beam number in the beam training of the first device in the beam pairing phase, the first received beam number is the number of received beams in all received beams of the first device in which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold; the above transmitting unit is further configured to transmit a fourth BRP frame, the fourth BRP frame is used to feed back a second received beam number in the beam training of the second device in the beam pairing phase, the second received beam number is the number of received beams in all received beams of the second device in which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold.

[0094] Optionally, the above processing unit is further configured to generate a second BRP PPDU and a fourth BRP frame.

[0095] Each second BRP PPDU includes a second BRP frame and a TRN Unit. Similarly, each first BRP PPDU includes a first BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0096] In combination with the eighth aspect, in a possible design, the above receiving unit is further configured to receive a fifth BRP PPDU multiple times. The fifth BRP frame included in the fifth BRP PPDU is used to indicate that the second device evaluates the change amount of the CSI from the first device to the second device; the above sending unit is further configured to send a sixth BRP PPDU multiple times. The sixth BRP frame included in the sixth BRP PPDU is used to indicate that the first device evaluates the change amount of the CSI from the second device to the first device; the above receiving unit is further configured to receive a seventh BRP frame carrying a first beam information list. The first beam information list is used to feedback multiple transmit beams for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmit beam; the above sending unit is further configured to send an eighth BRP frame carrying a second beam information list. The second beam information list is used to feedback multiple transmit beams for which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmit beam.

[0097] Optionally, the above processing unit is further configured to generate a sixth BRP PPDU and an eighth BRP frame carrying a second beam information list.

[0098] Each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0099] In any of the designs of any of the above aspects, when the first frame is a beacon frame, the first indication information is located in the optional sub-element sub-field of the enhanced directional multi-gigabit (EDMG) capability field of the beacon frame. The first indication information may include a CSI measurement request field and a CSI difference calculation field. The CSI measurement request field is used to indicate whether the second device measures CSI. When the CSI measurement request field is set to a first value, it is used to indicate that the second device measures CSI; when the CSI measurement request field is set to a second value, it is used to indicate that the second device does not measure CSI. In the first frame of this solution, the CSI measurement request field is set to the first value. The CSI difference calculation field is used to indicate whether the second device calculates the CSI difference. When the CSI difference calculation field is set to a first value, it is used to indicate that the second device calculates CSI; when the CSI difference calculation field is set to a second value, it is used to indicate that the second device does not calculate the CSI difference. Optionally, the first indication information further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field. The evaluation algorithm field is used to indicate the evaluation algorithm of CSI; the CSI change threshold field is used to indicate the CSI change threshold.

[0100] Wherein, the first value is 1 and the second value is 0; or the first value is 0 and the second value is 1.

[0101] It can be seen that in this solution, by carrying the first indication information in the optional sub-elements sub-field of the EDMG capability field of the beacon frame to indicate the second device to evaluate the change amount of CSI from the first device to the second device, it can neither change the original function of the beacon frame (or reuse the function of the original beacon frame), nor can it utilize the beacon frame to implement the sensing function without designing relevant processes for the sensing function in the patent, with less overhead and better compatibility.

[0102] In any design of any of the above aspects, when the first frame is a sector sweep (SSW) frame, the first indication information is carried in a reserved sub-field of the SSW feedback field of the SSW frame. The first indication information may include a CSI measurement request field and a CSI difference calculation field. The CSI measurement request field is used to indicate whether the second device measures CSI. When the CSI measurement request field is set to a first value, it is used to indicate that the second device measures CSI; when the CSI measurement request field is set to a second value, it is used to indicate that the second device does not measure CSI. In the first frame of this solution, the CSI measurement request field is set to the first value. The CSI difference calculation field is used to indicate whether the second device calculates the CSI difference. When the CSI difference calculation field is set to a first value, it is used to indicate that the second device calculates CSI; when the CSI difference calculation field is set to a second value, it is used to indicate that the second device does not calculate the CSI difference. Optionally, the first indication information further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field. The evaluation algorithm field is used to indicate the evaluation algorithm of CSI; the CSI change threshold field is used to indicate the CSI change threshold.

[0103] Wherein, the first value is 1 and the second value is 0; or the first value is 0 and the second value is 1.

[0104] It can be seen that in this solution, by carrying the first indication information in the reserved sub-field of the SSW feedback field of the SSW frame, the frame length of the original SSW frame can be unchanged, and other fields in the SSW frame can be reused, so that both the training of communication beams and the training of sensing beams can be realized, with flexible design and good compatibility.

[0105] In any design of any of the above aspects, when the second frame is an SSW frame, the second indication information is located in the reserved sub-field of the SSW feedback field of the SSW frame, and the first measurement result is located in the signal-to-noise ratio (SNR) report sub-field of the SSW feedback field of the SSW frame. The second indication information includes a CSI difference calculation field, and the CSI difference calculation field is used to indicate whether the first device calculates the CSI difference. When the CSI difference calculation field is set to a first value, it is used to indicate that the first device calculates CSI; when the CSI difference calculation field is set to a second value, it is used to indicate that the second device does not calculate the CSI difference.

[0106] Wherein, the first value is 1 and the second value is 0; or the first value is 0 and the second value is 1.

[0107] It can be seen that in this solution, the second indication information is carried in the second frame to instruct the first device to evaluate the change amount of the CSI from the second device to the first device, which is beneficial to training the optimal sensing transmission beam of the second device and providing a basis for subsequent WLAN sensing applications.

[0108] In any design of any of the above aspects, the above first measurement result includes a first antenna identifier and a first sector identifier, and the above second measurement result includes a second antenna identifier and a second sector identifier. The beam determined by the first antenna identifier and the first sector identifier is the beam among all the transmission beams of the first device where the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold. The beam determined by the second antenna identifier and the second sector identifier is the beam among all the transmission beams of the second device where the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold.

[0109] It can be seen that in this solution, the transmission beams with a CSI change amount greater than the threshold among all the transmission beams of the first device are fed back through the first measurement result as the optimal sensing transmission beam of the first device; the transmission beams with a CSI change amount greater than the threshold among all the transmission beams of the second device are fed back through the second measurement result as the optimal sensing transmission beam of the second device; during the sector-level scanning process of communication, the training of the sensing transmission beam is achieved.

[0110] In any design of any of the above aspects, the first BRP frame in the above first BRP PPDU and the second BRP frame in the above first BRP PPDU both include a CSI measurement request field and a beam scan cycle number field. The value of the CSI measurement request field is a first value, which is used to instruct the measurement of CSI; the beam scan cycle number field is used to indicate the number of scan cycles of the receiving beam.

[0111] Optionally, the first BRP frame in the first BRP PPDU and the second BRP frame in the first BRP PPDU further include one or more of the following fields: a transmitting end sensing sector identifier field and a transmitting end sensing antenna identifier mask field, which are used to jointly indicate the transmitting sector and the transmitting antenna of the BRP frame; a CSI change threshold field, which is used to indicate the CSI change threshold; an evaluation algorithm field, which is used to indicate the CSI evaluation algorithm.

[0112] It can be seen that in this solution, by modifying the frame format of the BRP PPDU during the multi-sector detection process to introduce the sensing operation, the optimal sensing receiving beams of the first device and the second device can be respectively trained, providing a basis for subsequent WLAN sensing applications.

[0113] In any design of any of the above aspects, the above first receive beam quantity is carried in the directional multi-gigabit (DMG) beam refinement element of the above third BRP frame. The above second receive beam quantity is carried in the DMG beam refinement element of the fourth BRP frame.

[0114] In any design of any of the above aspects, the fifth BRP frame in the above fifth BRP PPDU and the sixth BRP frame in the above sixth BRP PPDU both include a CSI measurement request field and a beam scan cycle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI; the beam scan cycle number field is used to indicate the number of scan cycles of the receive beam.

[0115] Optionally, the fifth BRP frame in the above fifth BRP PPDU and the sixth BRP frame in the above sixth BRP PPDU further include one or more of the following fields: a transmitter sensing sector identification field and a transmitter sensing antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; a CSI change threshold field, which is used to indicate the CSI change threshold; an evaluation algorithm field, which is used to indicate the CSI evaluation algorithm.

[0116] It can be seen that in this solution, by modifying the frame format of the BRP PPDU during the beam pairing process to introduce a sensing operation, the optimal sensing transceiver beams of the first device and the second device can be paired, providing a basis for subsequent applications of WLAN sensing.

[0117] In any design of any of the above aspects, the above first beam information list is located in the sensing measurement feedback element of the above seventh BRP frame, and the above second beam information list is located in the sensing measurement feedback element of the above eighth BRP frame. Among them, the element identifier of the sensing measurement feedback element is a reserved value, such as 13.

[0118] In any one of the designs of any of the above aspects, the above first beam information list includes the antenna identifier and sector identifier corresponding to the transmit beam in a plurality of transceiver beam pairs where the change amount of the CSI from the second device to the first device is greater than the CSI change threshold, and the receive antenna identifier corresponding to each transmit beam. Similarly, the above second beam information list includes the antenna identifier and sector identifier corresponding to the transmit beam in a plurality of transceiver beam pairs where the change amount of the CSI from the first device to the second device is greater than the CSI change threshold, and the receive antenna identifier corresponding to each transmit beam. It should be understood that a transceiver beam pair consists of a transmit beam and a receive beam. An antenna identifier and a sector identifier can be used to uniquely determine a beam. However, since the receive beam is used by the receiving end to receive data, the direction of the receive beam does not need to be informed to the transmit end and only the receiving end needs to know it. Therefore, the sector identifier of the receive beam may not be included in the first beam information list.

[0119] In a ninth aspect, the present application provides a first device, including a transceiver, and optionally a processor.

[0120] In one design, the transceiver is configured to send a plurality of first frames, each first frame including first indication information for instructing the second device to evaluate the change amount of the CSI from the first device to the second device; the transceiver is further configured to omnidirectionally receive a plurality of second frames, each second frame including a first measurement result and second indication information, the first measurement result being used to feedback a transmit beam where the change amount of the CSI from the first device to the second device is greater than the CSI change threshold, and the second indication information being used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the transceiver is further configured to send a third frame, the third frame including a second measurement result, the second measurement result being used to feedback a transmit beam where the change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

[0121] Optionally, the processor is configured to generate a plurality of first frames; the processor is further configured to generate the third frame.

[0122] In another design, a transceiver is configured to send multiple first frames, where each first frame includes first indication information for indicating a second device to evaluate a change amount of the CSI from the first device to the second device; the transceiver is further configured to quasi-omnidirectionally receive multiple second frames, where each second frame includes second indication information for indicating the first device to evaluate a change amount of the CSI from the second device to the first device; the transceiver is further configured to send a first sensing feedback frame, where the first sensing feedback frame includes a second measurement result for feeding back multiple transmission beams for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the transceiver is further configured to receive a second sensing feedback frame, where the second sensing feedback frame includes a first measurement result for feeding back multiple transmission beams for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0123] Optionally, a processor is configured to generate multiple first frames; the processor is further configured to generate a first sensing feedback frame.

[0124] In a tenth aspect, the present application provides a second device, including a transceiver and optionally a processor.

[0125] In one design, a transceiver is configured to quasi-omnidirectionally receive multiple first frames, where each first frame includes first indication information for indicating the second device to evaluate a change amount of the CSI from the first device to the second device; the transceiver is further configured to send multiple second frames, where each second frame includes a first measurement result and second indication information, the first measurement result is for feeding back a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information is for indicating the first device to evaluate a change amount of the CSI from the second device to the first device; the transceiver is further configured to receive a third frame, where the third frame includes a second measurement result for feeding back a transmission beam for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0126] Optionally, a processor is configured to generate multiple second frames.

[0127] In another design, a transceiver is configured to quasi-omnidirectionally receive a plurality of first frames, each first frame including first indication information for instructing the second device to evaluate the change amount of the CSI from the first device to the second device; the transceiver is further configured to send a plurality of second frames, each second frame including second indication information for instructing the first device to evaluate the change amount of the CSI from the second device to the first device; the transceiver is further configured to receive a first sensing feedback frame, the first sensing feedback frame including a second measurement result for feeding back a plurality of transmission beams for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the transceiver is further configured to send a second sensing feedback frame, the second sensing feedback frame including a first measurement result for feeding back a plurality of transmission beams for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0128] Optionally, a processor is configured to generate a plurality of second frames; the processor is further configured to generate a second sensing feedback frame.

[0129] In an eleventh aspect, the present application provides a first device, which may exist in the form of a chip product, and the structure of the first device includes an input / output interface and a processing circuit.

[0130] In one design, the input / output interface is configured to send a plurality of first frames, each first frame including first indication information for instructing the second device to evaluate the change amount of the CSI from the first device to the second device; the input / output interface is further configured to quasi-omnidirectionally receive a plurality of second frames, each second frame including a first measurement result and second indication information, the first measurement result for feeding back a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information for instructing the first device to evaluate the change amount of the CSI from the second device to the first device; the input / output interface is further configured to send a third frame, the third frame including a second measurement result for feeding back a transmission beam for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0131] Optionally, the processing circuit is configured to generate a plurality of first frames; the processing circuit is further configured to generate a third frame.

[0132] In another design, an input / output interface is configured to send multiple first frames, each first frame including first indication information for instructing a second device to evaluate a change amount of the CSI from the first device to the second device; the input / output interface is further configured to quasi-omnidirectionally receive multiple second frames, each second frame including second indication information for instructing the first device to evaluate a change amount of the CSI from the second device to the first device; the input / output interface is further configured to send a first sensing feedback frame, the first sensing feedback frame including a second measurement result for feeding back multiple transmission beams for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the input / output interface is further configured to receive a second sensing feedback frame, the second sensing feedback frame including a first measurement result for feeding back multiple transmission beams for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0133] Optionally, a processing circuit is configured to generate multiple first frames; the processing circuit is further configured to generate a first sensing feedback frame.

[0134] In a twelfth aspect, the present application provides a second device, which may exist in the form of a chip product, and the structure of the second device includes an input / output interface and a processing circuit.

[0135] In one design, an input / output interface is configured to quasi-omnidirectionally receive multiple first frames, each first frame including first indication information for instructing the second device to evaluate a change amount of the CSI from the first device to the second device; the input / output interface is further configured to send multiple second frames, each second frame including a first measurement result and second indication information, the first measurement result for feeding back a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information for instructing the first device to evaluate a change amount of the CSI from the second device to the first device; the input / output interface is further configured to receive a third frame, the third frame including a second measurement result for feeding back a transmission beam for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0136] Optionally, a processing circuit is configured to generate multiple second frames.

[0137] In another design, an input / output interface is used to quasi-omnidirectionally receive multiple first frames, and each first frame includes first indication information for indicating the second device to evaluate the change amount of the CSI from the first device to the second device; the input / output interface is further used to send multiple second frames, and each second frame includes second indication information for indicating the first device to evaluate the change amount of the CSI from the second device to the first device; the input / output interface is further used to receive a first sensing feedback frame, and the first sensing feedback frame includes a second measurement result for feeding back multiple transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold; the input / output interface is further used to send a second sensing feedback frame, and the second sensing feedback frame includes a first measurement result for feeding back multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold.

[0138] Optionally, a processing circuit is used to generate multiple second frames; the processing circuit is further used to generate a second sensing feedback frame.

[0139] In a thirteenth aspect, the present application provides a computer-readable storage medium, in which program instructions are stored. When the program instructions are run on a computer, the computer is caused to execute the method described in the first aspect, or the second aspect, or the fifth aspect, or the sixth aspect above.

[0140] In a fourteenth aspect, the present application provides a computer program product containing program instructions. When it runs on a computer, the computer is caused to execute the method described in the first aspect, or the second aspect, or the fifth aspect, or the sixth aspect above.

[0141] By implementing the embodiments of the present application, the traditional beamforming training mechanism in 802.11ay can be combined with WLAN sensing, so as to realize sensing and training of the beams for sensing while performing the original communication beam training, without the need to specifically design relevant processes for sensing and training the sensing beams, with less overhead and better compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0142] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for description in the embodiments will be briefly introduced below.

[0143] Figure 1 is a system architecture diagram provided by an embodiment of the present application;

[0144] Figure 2 is a schematic structural diagram of an AP or STA provided by an embodiment of the present application;

[0145] Figure 3a It is a schematic diagram of a beamforming training process provided by an embodiment of the present application;

[0146] Figure 3b It is another schematic diagram of a beamforming training process provided by an embodiment of the present application;

[0147] Figure 3c It is a schematic diagram of the beam direction in beamforming training provided by an embodiment of the present application;

[0148] Figure 4a It is a schematic diagram of the timing of beamforming training for sending beacon frames provided by an embodiment of the present application;

[0149] Figure 4b It is a schematic diagram of the timing of beamforming training for sending SSW frames provided by an embodiment of the present application;

[0150] Figure 5 It is a schematic flowchart of a radio frequency sensing method provided by an embodiment of the present application;

[0151] Figure 6 It is a schematic diagram of the frame format of the beacon frame provided by an embodiment of the present application;

[0152] Figure 7 It is a schematic diagram of the frame format of the SSW frame in ISS provided by an embodiment of the present application;

[0153] Figure 8 It is a schematic diagram of the frame format of the SSW frame in RSS provided by an embodiment of the present application;

[0154] Figure 9 It is a schematic diagram of the frame format of the SSW feedback frame provided by an embodiment of the present application;

[0155] Figure 10 It is a schematic diagram of the timing of the SLS stage provided by an embodiment of the present application;

[0156] Figure 11 It is another schematic diagram of the timing of the SLS stage provided by an embodiment of the present application;

[0157] Figure 12 It is a schematic flowchart of the MID process in the radio frequency sensing method provided by an embodiment of the present application;

[0158] Figure 13 It is a schematic diagram of the frame format of the BRP sensing request element provided by an embodiment of the present application;

[0159] Figure 14 It is a schematic diagram of the frame format of the DMG beam refinement element provided by an embodiment of the present application;

[0160] Figure 15It is a schematic flowchart of the BC process in the radio frequency sensing method provided by an embodiment of the present application;

[0161] Figure 16 It is a timing schematic diagram of the BRP stage provided by an embodiment of the present application;

[0162] Figure 17 It is another schematic flowchart of the radio frequency sensing method provided by an embodiment of the present application;

[0163] Figure 18 It is a schematic diagram of the frame format of the first sensing feedback frame provided by an embodiment of the present application;

[0164] Figure 19 It is a timing schematic diagram of the radio frequency sensing method provided by an embodiment of the present application;

[0165] Figure 20 It is a schematic diagram of the structure of the first device provided by an embodiment of the present application;

[0166] Figure 21 It is a schematic diagram of the structure of the second device provided by an embodiment of the present application. Detailed implementation manners

[0167] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application.

[0168] In the description of the present application, unless otherwise specified, " / " means "or". For example, A / B may represent A or B. Herein, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, "at least one" means one or more, and "a plurality" means two or more. The words such as "first" and "second" do not limit the quantity and execution order, and the words such as "first" and "second" do not necessarily limit to be different.

[0169] In the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific manner.

[0170] To facilitate the understanding of the technical solutions of the embodiments of this application, the system architecture and / or application scenarios of the radio frequency sensing method provided in the embodiments of this application will be described below. It can be understood that the scenarios described in the embodiments of this application are for more clearly explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application.

[0171] The embodiments of this application provide a radio frequency sensing method, which can modify relevant frame structures and / or feedback processes based on the beamforming training process in the 802.11ay standard, and can combine the traditional beamforming training mechanism in 802.11ay with WLAN sensing. While performing the original communication beam training, it can realize the sensing of single / multiple targets and the training of beams for sensing, without the need to specifically design relevant processes for sensing and training sensing beams, with relatively small overhead and good compatibility. This method can be applied to a wireless communication system, which can be a wireless local area network or a cellular network; this method can be implemented by a communication device or a chip or a processor in the communication device in the wireless communication system. The communication device can be an access point (AP) device or a station (STA) device. The access point device and the station device can be either single-link devices or multi-link devices.

[0172] See Figure 1 , Figure 1 is a system architecture diagram provided by the embodiments of this application. As Figure 1 shown, the system architecture includes at least 2 WLAN devices (such as Figure 1 the AP and STA in Figure 1 ), and one of the WLAN devices (such as the AP) can perform beamforming training with another WLAN device (such as the STA). Optionally,

[0173] An access point (AP) is a device with wireless communication capabilities that supports communication using the WLAN protocol and has the function of communicating with other devices (such as stations or other access points) in the WLAN network. Of course, it can also have the function of communicating with other devices. In a WLAN system, the access point can be referred to as an access point station (AP STA). This device with wireless communication capabilities can be a complete device, or it can be a chip or processing system installed in the complete device. The device installed with these chips or processing systems can, under the control of the chip or processing system, implement the methods and functions of the embodiments of the present application. The AP in the embodiments of the present application is a device that provides services for the STA and can support the 802.11 series of protocols. For example, the AP can be a communication entity such as a communication server, router, switch, bridge, etc.; the AP can include various forms of macro base stations, micro base stations, relay stations, etc. Of course, the AP can also be the chips and processing systems in these various forms of devices, so as to implement the methods and functions of the embodiments of the present application.

[0174] A station (STA) is a device with wireless communication capabilities that supports communication using the WLAN protocol and has the ability to communicate with other stations or access points in the WLAN network. In a WLAN system, the station can be referred to as a non-access point station (non-AP STA). For example, the STA is any user communication device that allows users to communicate with the AP and thus communicate with the WLAN. This device with wireless communication capabilities can be a complete device, or it can be a chip or processing system installed in the complete device. The device installed with these chips or processing systems can, under the control of the chip or processing system, implement the methods and functions of the embodiments of the present application. For example, the STA can be a user device that can be connected to the Internet, such as a tablet computer, desktop, laptop, notebook computer, Ultra-mobile Personal Computer (UMPC), handheld computer, netbook, Personal Digital Assistant (PDA), mobile phone, etc., or an Internet of Things node in the Internet of Things, or a vehicle-mounted communication device in a vehicle-to-everything network, or an entertainment device, game device or system, a global positioning system device, etc. The STA can also be the chips and processing systems in the above-mentioned terminals.

[0175] Specifically, this application focuses on a method for implementing WLAN sensing by using the beamforming training process in the 802.11ay standard. This method can be implemented by the controller of a wireless communication network device, that is, the controller realizes the WLAN Sensing function described in this application by sending or receiving the signaling and interaction processes designed in this application. This application focuses on the interaction process and negotiation between the two parties of WLAN sensing, that is, between the AP and the STA, and does not improve the internal structure of the AP and the STA. A brief description of the structures of the AP and the STA is given below. Refer to Figure 2 , Figure 2 which is a schematic structural diagram of the AP or STA provided in an embodiment of this application. As Figure 2 shown, the AP or STA may include: an application layer module, a transmission control protocol (TCP) / user datagram protocol (UDP) processing module, an internet protocol (IP) processing module, a logical link control (LLC) module, a media access control (MAC) layer module, a physical (PHY) layer baseband module, a radio frequency (RF) radio, and an antenna, etc. Among them, Figure 2 the AP or STA shown may be either a single-antenna structure or a multi-antenna structure, and the embodiments of this application do not make any limitations in this regard.

[0176] The WLAN system can provide high-speed and low-latency transmission. With the continuous evolution of WLAN application scenarios, the WLAN system will be applied to more scenarios or industries. For example, it can be applied to the Internet of Things industry, the vehicle-to-everything industry, the banking industry, enterprise offices, stadium exhibition halls, concert halls, hotel rooms, dormitories, wards, classrooms, shopping malls, squares, streets, production workshops, and warehouses, etc. Of course, the devices supporting WLAN communication (such as access points or stations) can be sensor nodes in a smart city (such as smart water meters, smart electricity meters, smart air detection nodes), smart devices in a smart home (such as smart cameras, projectors, displays, televisions, speakers, refrigerators, washing machines, etc.), nodes in the Internet of Things, entertainment terminals (such as wearable devices like augmented reality (AR), virtual reality (VR), etc.), smart devices in smart offices (such as printers, projectors, loudspeakers, speakers, etc.), vehicle-to-everything devices in the vehicle-to-everything network, infrastructure in daily life scenarios (such as vending machines, self-guided navigation desks in shopping malls, self-checkout devices, self-ordering machines, etc.), and devices in large sports and music venues, etc. In the embodiments of the present application, the specific forms of the STA and AP are not limited, and this is only an exemplary description here.

[0177] The above content briefly describes the system architecture provided by the present application. To better understand the technical solution provided by the present application, the beamforming training (BFT) process in the 802.11ay standard will be briefly described below.

[0178] The beamforming training process in the 802.11ay standard is mainly divided into two stages: the sector-level sweep (SLS) stage and the beam refinement protocol (BRP) stage. See Figure 3a and Figure 3b , Figure 3a and Figure 3b respectively show two processes of beamforming training. In addition, Figure 3c shows Figure 3a and Figure 3b the schematic diagram of the beam direction of each frame during the interaction in the beamforming training process shown. As Figure 3a and Figure 3b shown, the beamforming training process in the 802.11ay standard includes:

[0179] 1. Sector-level sweep phase (SLS phase)

[0180] The sector-level scanning phase includes four parts, namely the initiator sector sweep (ISS), the responder sector sweep (RSS), the sector sweep (SSW) feedback (SSW Feedback), and the sector sweep acknowledgment (SSW ACK).

[0181] Among them, the initiator sector sweep (ISS) is used to train the initiator's directional transmission beam. The initiator transmits training data in a beam with a certain width in a directional manner, and the responder receives the training data in a quasi-omnidirectional manner. The responder sector sweep (RSS) is used to train the responder's directional transmission beam. The responder transmits training data in a beam with a certain width in a directional manner, and this training data contains the best transmission sector information of the initiator in the previous stage (i.e., the ISS stage); at this time, the initiator receives the training data in a quasi-omnidirectional manner. The sector sweep feedback (SSW Feedback) is used for the initiator to feedback the best transmission sector information of the responder in the previous stage (i.e., the RSS stage), and at this time, the responder is in the quasi-omnidirectional reception mode. The sector sweep acknowledgment (SSW ACK) does not exist when performing sector-level scanning before the data transfer interval (DTI). When performing sector-level scanning within the data transfer interval, the sector sweep acknowledgment (SSW ACK) is required to confirm the receipt of the SSW Feedback frame sent by the initiator.

[0182] It should be understood that the training data in the ISS stage can refer to beacon frames or SSW frames, and the training data in the RSS stage can refer to SSW frames.

[0183] 2. Beam refinement phase (BRP phase)

[0184] The beam refinement phase includes BRP establishment (also known as initialization settings), multiple sector ID detection (MID), beam combining (BC), and beam refinement transaction (BRT), etc.

[0185] Among them, the initialization setting (i.e., BRP establishment) is used to configure the training information for the subsequent multi-sector detection (MID) and beam pairing (BC) phases. The function of multi-sector detection is to train the best receiving beams of the initiator and responder. Its training process is similar to the training process of the best transmitting beams (the aforementioned ISS phase and RSS phase), but the difference is that the training data is sent in a quasi-omnidirectional mode and received in a directional mode. It should be understood that the training data in the MID phase refers to BRP PPDU (Physical layer protocol data unit). Among them, the BRP PPDU includes a BRP frame and a training unit (TRN Unit). The function of beam pairing is to pair the transceiver beams obtained by training in the sector-level scanning phase and the multi-sector detection phase respectively to obtain the best transceiver beam pairing, so as to find the best directional communication link. At this time, both the sending and receiving of training data adopt the directional mode. After beam pairing, at least one round of beam refinement process is required to perform further beam refinement, so as to iteratively find a more refined transceiver beam pair and improve the communication link quality. It should be understood that this application does not involve the beam refinement process, so Figure 3a to Figure 3b the beam refinement process is not shown in

[0186] As Figure 3a and Figure 3b shown, in the ISS phase of beamforming training, either a beacon frame or a sector scan (SSW) frame can be sent. When different frames are sent, the beamforming training process is located in different time intervals of a beacon interval (BI). In one implementation, referring to Figure 4a , Figure 4a is a timing schematic diagram of beamforming training for sending beacon frames provided by an embodiment of the present application. As Figure 4a shown, within a beacon interval (BI), when the beamforming training process sends a beacon frame, its sector-level scanning process is carried out in the beacon transmission interval (BTI) and the association beamforming training (A-BFT). After another announcement transmission interval (ATI), beam refinement starts within the data transmission interval. At this time, the beam refinement process needs to go through three stages: BRP establishment (also known as initialization setting), multi-sector detection, and beam pairing, and finally data transmission is carried out.

[0187] In another implementation, referring to Figure 4b ,Figure 4b This is a timing schematic diagram of beamforming training for transmitting SSW frames provided by an embodiment of the present application. As Figure 4b shown, within a BI, when transmitting an SSW frame during the beamforming training process, its sector-level scanning process is carried out within the data transmission interval and is no longer synchronized with the BTI and A-BFT. The sector-level scanning process starts first within the data transmission interval, and then the beam refinement process is carried out. At this time, the beam refinement process includes two stages: multi-sector detection and beam pairing, and optionally also includes a BRP establishment (also known as initialization setting) stage. Finally, data transmission starts.

[0188] It can be seen that the main purpose of the beamforming training process in the 802.11ay standard is to obtain the optimal communication beam through multiple beam scans. Future 802.11 standards consider introducing WLAN sensing into the beamforming training mechanism. However, how to combine the traditional beamforming training mechanism with WLAN sensing to perform WLAN sensing without affecting normal communication has become an urgent problem to be solved.

[0189] WLAN sensing technology can be generally divided into two types. One is to use radar technology, and wireless devices sense detection targets by transmitting radar signals; the other is to sense detection targets by measuring the channel state information (CSI) to obtain the channel feature changes at different times. This application focuses on the method of sensing detection targets through CSI.

[0190] An embodiment of the present application provides a radio frequency sensing method, which senses through the changes in CSI values measured by multiple scans of the same beam, and modifies the relevant frame structure and feedback process based on the beamforming training process of the 802.11ay standard, so as to combine the traditional beamforming training mechanism in 802.11ay with WLAN sensing, thereby realizing the sensing of single / multiple targets and the training of beams for sensing while performing the original communication beam training, without the need to specifically design relevant processes for sensing and training sensing beams, with less overhead and better compatibility.

[0191] The technical solution provided by the present application will be described in detail below with reference to more accompanying drawings.

[0192] The technical solution provided in this application is described in detail through two embodiments. Among them, Embodiment 1 elaborates on the beamforming training process based on the 802.11ay standard and how to design relevant frame structures to simultaneously achieve communication beam training and radio frequency sensing in a sensing scenario where only a single best sensing beam needs to be fed back. Embodiment 2 elaborates on the beamforming training process based on the 802.11ay standard and how to design relevant frame structures and feedback processes to simultaneously achieve communication beam training and radio frequency sensing in a sensing scenario where a single or multiple best sensing beams are fed back.

[0193] It can be understood that the first device in this application can represent the initiator, and the initiator can be either the Figure 1 AP in or the STA, that is to say, the first device can be either an AP or an STA. The second device in this application can represent the responder, and the responder can be either the Figure 1 STA in or the AP, that is to say, the second device can be either an STA or an AP.

[0194] It can also be understood that both the first device and the second device in this application support the 802.11 standard, such as the 802.11ay standard, and can also support other 802.11 standards, such as 802.11be, 802.11ax, or the next-generation standard of 802.11be, etc.

[0195] Embodiment 1

[0196] Embodiment 1 of this application mainly introduces the beamforming training process based on the 802.11ay standard and how to modify the relevant frame formats in the beamforming training process to simultaneously achieve communication beam training and radio frequency sensing in the case of sensing a single moving target and only needing to feedback a single best sensing beam.

[0197] Since the beamforming training process in the 802.11ay standard includes the SLS stage and the BRP stage, the radio frequency sensing method provided in Embodiment 1 of this application also includes the SLS stage and the BRP stage. Among them, the SLS stage includes the ISS process, the RSS process, and the SSW feedback process, and the BRP stage includes the MID process and the BC process.

[0198] See Figure 5 , Figure 5 is a schematic flowchart of the radio frequency sensing method provided in the embodiment of this application. As Figure 5As shown in the figure, the ISS process includes step S101 and step S102, which can be used to train the optimal sensing transmission beam of the first device (or initiator); the RSS process includes step S103 and step S104, which can be used to train the optimal sensing transmission beam of the second device (or responder), and can be used to feedback the optimal sensing transmission beam of the first device obtained by the ISS process; the SSW feedback process includes step S105 and step S106, which can be used to feedback the optimal sensing transmission beam obtained by the RSS process.

[0199] Specifically, Figure 5 The radio frequency sensing method shown in the figure includes but is not limited to the following steps:

[0200] S101, the first device sends multiple first frames, and each first frame includes first indication information, which is used to indicate the second device to evaluate the change amount of the channel state information CSI from the first device to the second device.

[0201] S102, the second device omnidirectionally receives multiple first frames.

[0202] Optionally, the first device sends the first frame in a sector scanning manner, the second device omnidirectionally receives the first frame, and the second device compares the change of the CSI value when the same transmission beam of the first device is scanned multiple times to determine whether there is a moving target in the beam scanning area. The second device records the transmission beam with a moving target in the scanned area. It should be understood that in the embodiments of the present application, when the first device sends the first frame in a sector scanning manner, it can be understood that the first device sends the first frame directionally with a beam of a certain width each time, and a sector identification (Sector ID) field and a directional multi-gigabit (DMG) antenna identification (DMG Antenna ID) field are set in the first frame, which are used to indicate the transmission sector and the transmission antenna of the first frame respectively. It should also be understood that the sector identification field and the DMG antenna identification field can be used to uniquely determine a beam. Among them, the same transmission sector and the same transmission antenna are sent (or scanned) at least 2 times. Therefore, the first device will send multiple first frames. Among them, these multiple first frames can be sent within one beacon interval (BI), or can be sent in multiple BIs. In other words, the first device can scan multiple circles within one BI; or the first device scans one circle within one BI and completes scanning multiple circles within multiple BIs.

[0203] Optionally, each first frame includes first indication information, which is used to indicate the second device (or the peer device) to evaluate the change amount of the CSI from the first device to the second device, or is used to indicate the peer device (here refers to the second device, or responder) to start the sensing operation.

[0204] The implementation method of the first frame will be described in detail below.

[0205] (1) The first frame is a beacon frame

[0206] Optionally, when the first frame is a beacon frame, a new element field can be added to the optional subelements subfield in the enhanced directional multi-gigabit (EDMG) capability field of the beacon frame, which is used to indicate the start of the sensing operation or indicate that the second device (or the peer) evaluates the change amount of the channel state information (CSI) from the first device to the second device. That is to say, the above first indication information can be located in the new element field of the optional subelements subfield of the EDMG capability field of the beacon frame. In this application, this newly added element is called the sensing control element. It should be understood that this newly added element can also have other names, which are not limited in this application. In other words, the first indication information is specifically carried in the sensing control element of the beacon frame, which is used to indicate that the peer (here refers to the second device or the responder) starts the sensing operation or evaluates the change amount of the CSI from the first device to the second device. Among them, the subelement ID of the sensing control element is one of the reserved values (from 5 to 255), such as 5.

[0207] Optionally, the above first indication information (that is, the sensing control element) includes a CSI measurement request field and a CSI difference calculation field. When the value of the CSI measurement request field is the first value, it is used to indicate that the peer (here refers to the second device or the responder) measures the CSI; when the value of the CSI measurement request field is the second value, it is used to indicate that the peer (here refers to the second device or the responder) does not measure the CSI. In the embodiment of this application, the CSI measurement request field of the beacon frame is set to the first value. The CSI difference calculation field is used to indicate whether the second device calculates the CSI difference. When the value of the CSI difference calculation field is the first value, it is used to indicate that the second device calculates the CSI difference; when the value of the CSI difference calculation field is the second value, it is used to indicate that the second device does not calculate the CSI difference. The first value can be 1 and the second value is 0; or, the first value is 0 and the second value is 1. The first indication information also includes one or more of the following fields: an evaluation algorithm field and a CSI change threshold field. Among them, the evaluation algorithm field is used to indicate the evaluation algorithm of the CSI, and the CSI change threshold field is used to indicate the CSI change threshold. It should be understood that the evaluation algorithm of the CSI is used to evaluate (or calculate) the CSI value, and the CSI change threshold is used to compare with the change of the CSI value measured when the same beam scans the same position multiple times to determine whether there is a moving target in the beam scanning area.

[0208] It should also be understood that each field included in the above first indication information may have other names, and the embodiments of the present application do not limit this.

[0209] See Figure 6 , Figure 6 which is a schematic diagram of the frame format of the beacon frame provided by the embodiments of the present application. As Figure 6 shown, the frame body of the beacon frame includes an EDMG Capabilities field, and the optional subelements subfield of the EDMG Capabilities field includes a sensing control element. The subelement ID of the sensing control element is one of the reserved values (from 5 to 255), such as Figure 6 the subelement ID 5 in. That is to say, when the subelement ID of the optional subelements subfield is a certain reserved value, it indicates that this optional subelement is a sensing control element. The sensing control element (or the above first indication information) includes a CSI Measurement Request field, an Evaluation algorithm field, a CSI Variation Threshold field, and a CSI Variation Calculation field. Among them, the length of the CSI Measurement Request field is 1 bit. When the value of the CSI Measurement Request field is the first value, it is used to indicate to enable CSI measurement. It should be understood that the CSI Measurement Request field in the beacon frame is set to the first value. The length of the Evaluation algorithm field is 2 bits, which is used to indicate the evaluation algorithm of CSI. The length of the CSI Variation Threshold field is 2 bits, which is used to indicate the CSI variation threshold. When the change in the CSI value measured by multiple scans of the same transmission beam is greater than the CSI variation threshold, it indicates that there is a moving target in the beam scanning area, and the responder (i.e., the second device) will store the transmission antenna ID and transmission sector ID corresponding to the transmission beam; on the contrary, when the change in the CSI value measured by multiple scans of the same transmission beam is less than or equal to the CSI variation threshold, it indicates that there is no moving target in the beam scanning area. The length of the CSI Variation Calculation field is 1 bit, which is used to indicate whether the peer end performs CSI difference calculation. When the value of the CSI Variation Calculation field is the first value, it indicates that the peer end performs CSI difference calculation; when the value of the CSI Variation Calculation field is the second value, it indicates that the peer end does not perform CSI difference calculation. The first value can be 1, and the second value can be 0; or the first value is 0, and the second value is 1.

[0210] It should be understood that Figure 6 each field included in the sensing control element may also have other names, and the embodiments of the present application do not limit this.

[0211] Optionally, the CSI difference calculation field in the beacon frame sent for the first time of the same beam should be set to a second value, and the CSI difference calculation field in the beacon frame sent for the Nth time of the same beam can be set to a first value. N is an integer greater than or equal to 2.

[0212] Optionally, the evaluation algorithm of CSI and / or the CSI change threshold can also be specified in the standard, without the need to indicate by carrying fields in the beacon frame. In other words, Figure 6 the shown sensing control element may not include an evaluation algorithm field and / or a CSI change threshold field.

[0213] (2) The first frame is an SSW frame

[0214] Optionally, when the first frame is an SSW frame, the reserved sub-field in the SSW feedback field of the SSW frame can be used to carry the above first indication information, and this first indication information is used to indicate the peer end (here refers to the second device or the responder) to start the sensing operation or evaluate the change amount of CSI from the first device to the second device.

[0215] Optionally, the first indication information includes a CSI measurement request field and a CSI difference calculation field. When the value of the CSI measurement request field is a first value, it is used to indicate the peer end (here refers to the second device or the responder) to measure CSI; when the value of the CSI measurement request field is a second value, it is used to indicate the peer end (here refers to the second device or the responder) not to measure CSI. In the embodiments of the present application, the CSI measurement request field of the SSW frame is set to the first value. The CSI difference calculation field is used to indicate whether the second device calculates the CSI difference. When the value of the CSI difference calculation field is a first value, it is used to indicate the peer end (here refers to the second device or the responder) to calculate the CSI difference; when the value of the CSI difference calculation field is a second value, it is used to indicate the peer end (here refers to the second device or the responder) not to calculate the CSI difference. The first value can be 1 and the second value is 0; or, the first value is 0 and the second value is 1. The first indication information further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field. Among them, the evaluation algorithm field is used to indicate the evaluation algorithm of CSI, and the CSI change threshold field is used to indicate the CSI change threshold. It should be understood that the CSI evaluation algorithm is used to calculate the CSI value, and the CSI change threshold is used to compare with the change of the CSI value measured when the same beam scans the same position multiple times to determine whether there is a moving target in the beam scanning area.

[0216] It should also be understood that each field included in the above first indication information may have other names, and the embodiments of the present application do not limit this.

[0217] See Figure 7 , Figure 7 which is a schematic diagram of the frame format of the SSW frame in the ISS provided by the embodiments of the present application. As Figure 7 shown, the SSW feedback field of this SSW frame includes three reserved sub-fields, where the lengths of two of the reserved sub-fields are 5 bits (B11 to B15, and B17 to B21), and the length of the other reserved sub-field is 1 bit (B23). Among them, the first reserved sub-field (such as Figure 7 B17 - B21 in includes a 1-bit CSI measurement request field, a 2-bit evaluation algorithm field, and a 2-bit CSI change threshold field, and the second reserved sub-field (B23) is a 1-bit CSI difference calculation field. When the value of the CSI measurement request field is the first value, it is used to indicate to start CSI measurement. It should be understood that the CSI measurement request field in this SSW frame is set to the first value. The evaluation algorithm field is used to indicate the evaluation algorithm of CSI. The CSI change threshold field is used to indicate the CSI change threshold. When the change in the CSI value measured by multiple scans of the same transmission beam is greater than this CSI change threshold, it indicates that there is a moving target in the beam scanning area, and the responder (i.e., the second device) will store the transmission antenna ID and transmission sector ID corresponding to this transmission beam; conversely, when the change in the CSI value measured by multiple scans of the same transmission beam is less than or equal to this CSI change threshold, it indicates that there is no moving target in the beam scanning area. The CSI difference calculation field is used to indicate whether the peer end performs CSI difference calculation. When the value of this CSI difference calculation field is the first value, it indicates that the peer end performs CSI difference calculation; when the value of this CSI difference calculation field is the second value, it indicates that the peer end does not perform CSI difference calculation. The first value can be 1, and the second value can be 0; or the first value is 0, and the second value is 1.

[0218] Optionally, the CSI difference calculation field in the SSW frame sent for the first time by the same beam should be set to the second value, and the CSI difference calculation field in the SSW frame sent for the Nth time by the same beam can be set to the first value. N is an integer greater than or equal to 2.

[0219] Optionally, the evaluation algorithm of CSI and / or the CSI change threshold can also be specified in the standard, and there is no need to indicate it by carrying a field in the beacon frame. In other words, Figure 7 the first reserved sub-field (B17 - B21) shown in may not include the evaluation algorithm field and / or the CSI change threshold field, and the remaining bits still represent reservation.

[0220] S103. The second device sends multiple second frames, each of which includes a first measurement result and second indication information. The first measurement result is used to feedback a transmission beam whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold, and the second indication information is used to indicate that the first device evaluates the change amount of the CSI from the second device to the first device.

[0221] S104. The first device omnidirectionally receives multiple second frames.

[0222] Optionally, the second device sends the second frame in a sector scanning manner, and the first device omnidirectionally receives the second frame. The first device compares the change of the CSI value during multiple scans of the same transmission beam of the second device to determine whether there is a moving target in the beam scanning area. The second device records the transmission beam with a moving target in the scanned area. The second frame is an SSW frame. It should be understood that in the embodiments of the present application, when the second device sends the second frame in a sector scanning manner, it can be understood that the second device sends the second frame in a directional manner with a certain width beam each time. The second frame is provided with a Sector ID field and a DMG Antenna ID field, which are respectively used to indicate the transmission sector and the transmission antenna of the second frame. It should also be understood that the Sector ID field and the DMG Antenna ID field can be used to uniquely determine a beam. Among them, the same transmission sector and the same transmission antenna are sent (or scanned) at least 2 times. Therefore, the second device will send multiple second frames, and these multiple second frames can be sent within one beacon interval (BI), or can be sent in multiple BIs. In other words, the second device can scan multiple circles within one BI; or the second device scans one circle within one BI and completes scanning multiple circles within multiple BIs.

[0223] Optionally, each second frame includes a first measurement result and second indication information. The first measurement result is used to feedback a transmission beam whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold. That is to say, the first measurement result is used to feedback the result evaluated by the second device, or is used to feedback the perception measurement result in the ISS phase (for example, the antenna identifier and sector identifier corresponding to the moving target). The second indication information is used to indicate that the first device (or the peer device) evaluates the change amount of the CSI from the second device to the first device, or is used to indicate the peer device (here referring to the first device, or the initiator) to start the sensing operation.

[0224] Optionally, the second frame is an SSW frame, and the second indication information may be located in a reserved subfield of the SSW feedback field of the SSW frame. The second indication information may include a CSI difference calculation field. The CSI difference calculation field is used to indicate whether the first device calculates the CSI difference. When the value of the CSI difference calculation field is a first value, it is used to indicate that the peer (the first device or the initiator) calculates the CSI difference; when the value of the CSI difference calculation field is a second value, it is used to indicate that the peer (the first device or the initiator) does not calculate the CSI difference. The first value may be 1 and the second value is 0; alternatively, the first value is 0 and the second value is 1. It should be understood that the second indication information may not include an evaluation algorithm field and a CSI change threshold field, that is, the second device does not need to inform the first device of the CSI evaluation algorithm and the CSI change threshold.

[0225] Optionally, the second indication information may further include a CSI measurement request field. When the value of the CSI measurement request field is a first value, it is used to indicate that the peer (here refers to the first device or the initiator) measures the CSI; when the value of the CSI measurement request field is a second value, it is used to indicate that the peer (here refers to the first device or the initiator) does not measure the CSI. If the second indication information includes a CSI measurement request field, the CSI measurement request field of the SSW frame is set to the first value. Among them, the length of the CSI measurement request field is 1 bit.

[0226] Optionally, the second frame is an SSW frame, and the first measurement result may be located in the signal-to-noise ratio (SNR) report subfield of the SSW feedback field of the SSW frame. Among them, the first measurement result includes a first antenna identifier and a first sector identifier, and the beam determined by the first antenna identifier and the first sector identifier is the beam among all the transmission beams of the first device where the CSI difference between any two (or adjacent two) CSI measurements on the same transmission beam is greater than the CSI change threshold. Since the change in the CSI value measured during multiple scans of the same transmission beam is greater than the CSI change threshold, it indicates that there is a moving target in the beam scanning area; therefore, the first antenna identifier and the first sector identifier can also be understood as the transmission antenna identifier and the transmission sector identifier of the initiator (i.e., the first device) corresponding to the moving target.

[0227] It should also be understood that if there are multiple transmit beams among all the transmit beams of the first device where the CSI difference between any two (or adjacent two) CSI measurements on the same transmit beam is greater than the CSI change threshold, the beam determined by the first antenna identifier and the first sector identifier can be the transmit beam with the largest CSI difference, or can be any one of the multiple transmit beams with a CSI difference greater than the CSI change threshold, or can be the first transmit beam with a CSI difference greater than the CSI change threshold. It should also be understood that the beam determined by the first antenna identifier and the first sector identifier can be used as the best transmit beam of the first device in the sensing scenario.

[0228] For example, assume that the first device sector scans two circles, that is, the first frame is transmitted twice using the same transmit beam at different times. The second device measures two CSI values based on the first frames received successively on the same transmit beam (determined by whether the first frames received at different times in the Sector ID field and DMG AntennaID field in the first frame are transmitted by the same transmit beam), and calculates the difference (or the absolute value of the difference) between these two CSI values according to the indication of the first frame transmitted the second time on this transmit beam, and compares the size of this difference with the CSI change threshold. Record the antenna identifier and sector identifier corresponding to the beam with a difference greater than the CSI change threshold (i.e., the values of the Sector ID field and DMG Antenna ID field in the first frame). The second device carries the antenna identifier and sector identifier corresponding to the beam with the largest CSI difference in the SNR report subfield of the SSW feedback field of the SSW frame and feeds it back to the first device.

[0229] Optionally, the second frame further includes third indication information for indicating whether the second frame includes the first measurement result, or for indicating whether the meaning of the SNR report subfield is to indicate the SNR of the communication best beam or to indicate the first measurement result. Wherein, the second frame is an SSW frame, and the third indication information is located in the reserved subfield of the SSW feedback field of the SSW frame.

[0230] See Figure 8 , Figure 8 is a schematic diagram of the frame format of the SSW frame in the RSS provided by the embodiments of the present application. As Figure 8As shown, the SSW feedback field of the SSW frame includes an 8-bit SNR report sub-field and a 5-bit reserved sub-field (B17 - B21). The reserved sub-field includes a 1-bit sensing extension field, a 1-bit CSI difference calculation field, and the remaining 3 bits still represent reservation. The CSI difference calculation field is used to indicate whether the peer end (the first device or the initiator) performs CSI difference calculation. When the value of the CSI difference calculation field is the first value, it indicates that the peer end (the first device or the initiator) performs CSI difference calculation; when the value of the CSI difference calculation field is the second value, it indicates that the peer end (the first device or the initiator) does not perform CSI difference calculation. When the value of the sensing extension field (the above-mentioned third indication information) is the first value, it is used to indicate that the SSW frame includes the first measurement result, or to indicate that the meaning of the SNR report sub-field in the SSW frame is to indicate the SNR of the best communication beam. When the value of the sensing extension field (the above-mentioned third indication information) is the second value, it is used to indicate that the SSW frame does not include the first measurement result, or to indicate that the meaning of the SNR report sub-field in the SSW frame is to indicate the first measurement result (the first antenna identifier and the first sector identifier). In other words, when the value of the sensing extension field (the above-mentioned third indication information) is the second value, the SNR report sub-field includes a 2-bit Target Antenna ID field and a 6-bit Target Sector ID identification field. The Target Antenna ID field is used to indicate the first antenna identifier, and the Target Sector ID field is used to indicate the first sector identifier. It should be understood that in the embodiments of the present application, the sensing extension field (the third indication information) is set to the first value. The first value can be 1, and the second value can be 0; or the first value is 0, and the second value is 1.

[0231] Optionally, the CSI difference calculation field in the SSW frame sent for the first time of the same beam should be set to the second value, and the CSI difference calculation field in the SSW frame sent for the Nth time of the same beam can be set to the first value. N is an integer greater than or equal to 2. It should be understood that in the RSS stage, even if the CSI difference calculation field of the SSW frame is set to the second value, after receiving the SSW frame, the first device will perform CSI measurement based on the received SSW frame. This is because in the ISS stage, the first device indicates to the peer end to measure CSI through the CSI measurement request field. Correspondingly, the first device itself also needs to perform corresponding measurement operations in the RSS stage, so there is no need for the CSI measurement request field to indicate that the first device measures CSI.

[0232] It should also be understood that Figure 8 The various fields included in the SNR report sub-field and the reserved field in the SSW feedback field of the shown SSW frame may also have other names, which are not limited in the embodiments of the present application.

[0233] S105. The first device sends a third frame, which includes a second measurement result for feeding back a transmission beam whose CSI change amount from the second device to the first device is greater than the CSI change threshold.

[0234] S106. The second device receives the third frame.

[0235] Optionally, the first device sends the third frame using the communication optimal transmission beam obtained through ISS phase training, and the second device receives the third frame in an omni-directional manner. Optionally, after receiving the third frame, the second device may reply with an SSW-Ack frame. The third frame is an SSW feedback frame. The third frame includes a second measurement result for feeding back a transmission beam whose CSI change amount from the second device to the first device is greater than the CSI change threshold. That is to say, the second measurement result is used to feed back the result evaluated by the first device or the sensing measurement result in the RSS phase (for example, the antenna identifier and sector identifier corresponding to a moving target).

[0236] Optionally, the above third frame is an SSW feedback frame, and the above second measurement result may be located in the SNR report sub-field of the SSW feedback field of the SSW feedback frame. Wherein, the second measurement result includes a second antenna identifier and a second sector identifier, and the beam determined by the second antenna identifier and the second sector identifier is the transmission beam whose CSI difference between any two (or adjacent two) CSI measurements on the same transmission beam among all the transmission beams of the second device is greater than the CSI change threshold. Since the change in the CSI value measured during multiple scans of the same transmission beam is greater than the CSI change threshold, it indicates that there is a moving target in the beam scanning area; therefore, the second antenna identifier and the second sector identifier can also be understood as the transmission antenna identifier and transmission sector identifier of the responder (i.e., the second device) corresponding to the moving target.

[0237] It should be understood that if there are multiple transmission beams among all the transmission beams of the second device whose CSI difference between any two (or adjacent two) CSI measurements on the same transmission beam is greater than the CSI change threshold, the beam determined by the second antenna identifier and the second sector identifier may be the transmission beam with the largest CSI difference, or may be any one of the multiple transmission beams whose CSI difference is greater than the CSI change threshold, or may be the first transmission beam whose CSI difference is greater than the CSI change threshold. It should also be understood that the beam determined by the second antenna identifier and the second sector identifier may be used as the optimal transmission beam of the second device in the sensing scenario.

[0238] For example, assume that the second device sector scans two circles, that is, the second frame is sent twice using the same transmission beam at different times. The first device measures two CSI values based on the second frames received successively on the same transmission beam (determined by the Sector ID field and the DMG Antenna ID field in the second frame whether the second frames received at different times are sent by the same transmission beam), and calculates the difference (or the absolute value of the difference) between the two CSI values according to the indication of the second frame sent the second time on this transmission beam, and compares the size of this difference with the CSI change threshold. Record the antenna identifier and sector identifier corresponding to the beam with the difference greater than the CSI change threshold (i.e., the values of the Sector ID field and the DMG Antenna ID field in the second frame). The first device carries the antenna identifier and sector identifier corresponding to the beam with the largest CSI difference in the SNR report sub-field of the SSW feedback field of the SSW feedback frame and feeds it back to the second device.

[0239] Optionally, the above third frame further includes fourth indication information, which is used to indicate whether the third frame includes the second measurement result, or is used to indicate whether the meaning of the SNR report sub-field is to indicate the SNR of the communication best beam or to indicate the second measurement result. Wherein, the third frame is an SSW feedback frame, and the fourth indication information is located in the reserved sub-field of the SSW feedback field of the SSW feedback frame.

[0240] Optionally, the above third frame may further include a CSI difference calculation field, which is used to indicate whether the second device calculates the CSI difference. The third frame is an SSW feedback frame, and the CSI difference calculation field is located in the reserved field of the SSW feedback field of the SSW feedback frame. When the value of the CSI difference calculation field is the first value, it is used to indicate that the peer (the second device or the responder) calculates the CSI difference; when the value of the CSI difference calculation field is the second value, it is used to indicate that the peer (the second device or the responder) does not calculate the CSI difference. The first value may be 1 and the second value is 0; or, the first value is 0 and the second value is 1. It should be understood that the CSI difference calculation field of the SSW feedback frame in the embodiments of the present application is set to the second value.

[0241] See Figure 9 , Figure 9 is a schematic diagram of the frame format of the SSW feedback frame provided by the embodiments of the present application. As Figure 9As shown, the SSW feedback field of the SSW feedback frame includes an 8-bit SNR reporting sub-field and a 5-bit reserved sub-field (B17 - B21). The reserved sub-field includes a 1-bit sensing extension field, a 1-bit CSI difference calculation field, and the remaining 3 bits still represent reservation. The CSI difference calculation field is used to indicate whether the peer end (the second device or the responder) performs CSI difference calculation. When the value of the CSI difference calculation field is the first value, it indicates that the peer end (the second device or the responder) performs CSI difference calculation; when the value of the CSI difference calculation field is the second value, it indicates that the peer end (the second device or the responder) does not perform CSI difference calculation. In the embodiment of the present application, the CSI difference calculation field of the SSW feedback frame is set to the second value. When the value of the sensing extension field (the above-mentioned fourth indication information) is the first value, it is used to indicate that the SSW feedback frame includes a second measurement result, or to indicate that the meaning of the SNR reporting sub-field in the SSW feedback frame is to indicate the SNR of the communication optimal beam. When the value of the sensing extension field (the above-mentioned fourth indication information) is the second value, it is used to indicate that the SSW feedback frame does not include the first measurement result, or to indicate that the meaning of the SNR reporting sub-field in the SSW feedback frame is to indicate the second measurement result (the second antenna identifier and the second sector identifier). In other words, when the value of the sensing extension field (the above-mentioned fourth indication information) is the second value, the SNR reporting sub-field includes a 2-bit target antenna identifier (Target Antenna ID) field and a 6-bit target sector (TargetSector ID) identifier field. The target antenna identifier field is used to indicate the second antenna identifier, and the target sector identifier field is used to indicate the second sector identifier. It should be understood that in the embodiment of the present application, the sensing extension field (the fourth indication information) is set to the first value. The first value can be 1, and the second value can be 0; or the first value is 0, and the second value is 1.

[0242] It should also be understood that Figure 9 The various fields included in the SNR reporting sub-field and the reserved field in the SSW feedback field of the SSW feedback frame shown may also have other names, which are not limited in the embodiment of the present application.

[0243] It can be seen that the embodiment of the present application is based on the SLS stage process of the 802.11ay standard, senses by the change of the CSI value measured by multiple scans of the same beam, and enables the sensing operation and feedback of sensing measurement results by modifying the relevant frame structure in the SLS stage. It can realize the sensing of a single moving target and the training of the beam for sensing while the original communication beam is trained, without specially designing relevant processes for sensing and training the sensing beam, with less overhead and better compatibility.

[0244] For better understanding Figure 5The SLS phase process of the method shown below is illustrated by two examples.

[0245] In one example, refer to Figure 10 , Figure 10 which is a timing diagram of the SLS phase provided by an embodiment of the present application. As Figure 10 shown, the Initiator sends a beacon frame directionally to instruct the Responder to start the sensing operation (or the Responder evaluates the change in CSI from the Initiator to the Responder). The Responder receives omnidirectionally. The Responder compares the changes in CSI values during multiple scans of the same beam to determine whether there is a moving target in the beam scanning area. Then, the Responder sends an SSW frame directionally to instruct the Initiator to perform a corresponding sensing operation (or the Initiator evaluates the change in CSI from the Responder to the Initiator). The Initiator receives omnidirectionally and carries the measurement results (including the first antenna identifier and the first sector identifier) obtained during the Initiator Transmit Sector Sweep (I-TXSS) process in the SSW frame for feedback. Similarly, the Initiator feeds back the measurement results (including the second antenna identifier and the second sector identifier) obtained during the Responder Transmit Sector Sweep (R-TXSS) process by sending an SSW feedback frame. Among them, the frame formats of each process in the SLS phase refer to the previous description and will not be elaborated here.

[0246] In another example, refer to Figure 11 , Figure 11 which is another timing diagram of the SLS phase provided by an embodiment of the present application. As Figure 11As shown, the Initiator sends a SSW frame directionally to instruct the Responder to start the sensing operation (or the Responder evaluates the change in the CSI from the Initiator to the Responder). The Responder receives omnidirectionally. The Responder compares the changes in the CSI values when the same beam scans the same position multiple times to determine whether there is a moving target in the beam scanning area. Then, the Responder sends a SSW frame directionally to instruct the Initiator to also perform the corresponding sensing operation (or the Initiator evaluates the change in the CSI from the Responder to the Initiator). The Initiator receives omnidirectionally and carries the measurement results obtained during the I-TXSS process (including the first antenna identifier and the first sector identifier) in the SSW frame for feedback. Similarly, the Initiator feeds back the measurement results obtained during the R-TXSS process (including the second antenna identifier and the second sector identifier) by sending a SSW feedback frame. The Responder receives omnidirectionally and sends a SSW-Ack frame to confirm that the SSW feedback frame has been received. Among them, the frame formats of each process in the SLS phase refer to the description above and will not be elaborated here.

[0247] It should be understood that Figure 10 and Figure 11 the main difference lies in whether the initiator in the ISS (or I-TXSS) process sends a beacon frame or a SSW frame.

[0248] After the above step S106, the radio frequency sensing method provided by the embodiment of the present application further includes a BRP phase. The BRP phase of the radio frequency sensing method provided by the embodiment of the present application will be described in detail below.

[0249] In one implementation Figure 5 In the method shown, the BRP phase can be the same as the BRP phase of beamforming training in the 802.11ay standard. The specific process and the frame formats involved can refer to the description in the 802.11ay standard and will not be elaborated here. In other words, the radio frequency sensing method provided by the embodiment of the present application is only applied to the SLS phase in the beamforming training process, and the BRP phase in the beamforming training process remains unchanged. That is to say, the radio frequency sensing method provided by the embodiment of the present application can obtain the best transmission beam of both the transceiver (initiator and Responder) in the sensing scenario, but cannot obtain the best receiving beam and the best transceiver beam of both the transceiver (initiator and Responder) in the sensing scenario.

[0250] In another implementation Figure 5In the method shown, the interaction process in the BRP phase is the same as that in the beamforming training of the 802.11ay standard in the BRP phase, but the frame formats are different. The BRP phase includes the MID process and the BC process. The following will describe Figure 5 the BRP phase in detail.

[0251] 1. MID process in the BRP phase

[0252] Refer to Figure 12 , Figure 12 which is a schematic flowchart of the MID process in the radio frequency sensing method provided in the embodiment of the present application. As Figure 12 shown, the MID process of the radio frequency sensing method includes but is not limited to the following steps:

[0253] S201, the first device quasi-omnidirectionally sends the first beam refinement physical layer protocol data unit BRP PPDU multiple times, and the first BRP PPDU is used to indicate the second device to evaluate the change amount of the channel state information CSI from the first device to the second device.

[0254] S202, the second device receives the first BRP PPDU multiple times.

[0255] Optionally, the first device quasi-omnidirectionally sends the first BRP PPDU multiple times (sending one first BRP PPDU each time, and each first BRP PPDU includes a first BRP frame and a training unit (TRN Unit)), the second device receives the first BRP PPDU in a sector scanning manner, and the second device compares the change of the CSI value when receiving the first BRP PPDU multiple times with the same receiving beam to determine whether there is a moving target in the beam scanning area. The second device records the receiving beam where a moving target exists in the scanned area. The multiple transmissions of the first device can be within one BI or within multiple BIs. It should be understood that the second device receiving the first BRP PPDU in a sector scanning manner can be understood as the second device receiving the first BRP PPDU in a beam polling manner, where each time the first BRP PPDU is received directionally with a beam of a certain width. Among them, the same receiving beam of the second device needs to be received (or scanned) at least 2 times. Therefore, the first device will send the first BRP PPDU multiple times. The first BRP frame in the first BRP PPDU is used to indicate the second device (or the peer) to evaluate the change amount of the CSI from the first device to the second device, or to indicate the peer (here referring to the second device or the responder) to start the sensing operation.

[0256] Optionally, based on the frame format of the original BRP PPDU (i.e., the BRP frame sent by the initiator of the MID process in the 802.11ay standard), a new element field is added to enable the receiving beam training of the responder (i.e., the second device). In this application, this newly added element is called the BRP Sensing Request element. It should be understood that this newly added element may have other names, which are not limited in this application. In other words, the first BRP PPDU includes the BRP Sensing Request element, which is used to instruct the second device (or the peer) to evaluate the change amount of the CSI from the first device to the second device, or to instruct the peer (here referring to the second device or the responder) to start the sensing operation. It should be understood that the 802.11ay standard only defines elements with element IDs from 0 to 11, and element IDs 12 and later represent reserved values. Therefore, the element ID of this BRP Sensing Request element is a reserved value, such as 12.

[0257] Optionally, the BRP Sensing Request element includes a CSI measurement request field and a beam scan circle number field. When the value of the CSI measurement request field is the first value, it is used to instruct the peer (here referring to the second device or the responder) to measure the CSI; when the value of the CSI measurement request field is the second value, it is used to instruct the peer (here referring to the second device or the responder) not to measure the CSI. In the embodiments of this application, the CSI measurement request field of the first BRP PPDU is set to the first value. The beam scan circle number field is used to instruct the peer (here referring to the second device or the responder) about the number of receiving beam scan circles. The BRP Sensing Request element further includes one or more of the following fields: a sender sensing sector identification field, a sender sensing antenna identification mask field, a CSI change threshold field, and an evaluation algorithm field. Among them, the sender sensing sector identification field and the sender sensing antenna identification mask field are used to jointly indicate the transmission sector and transmission antenna of the current BRP frame. The CSI change threshold field is used to indicate the CSI change threshold. The evaluation algorithm field is used to indicate the evaluation algorithm of the CSI.

[0258] It should be understood that each field included in the above BRP Sensing Request element may have other names, which are not limited in the embodiments of this application.

[0259] See Figure 13 , Figure 13 is a schematic diagram of the frame format of the BRP Sensing Request element provided by the embodiments of this application. As Figure 13As shown, on the basis of the original BRP frame format, a BRP SensingRequest element with an element identifier reserved value (such as 12) is newly added. This BRP sensing request element includes a Sensing TX Sector ID field, a Sensing TX Antenna ID Mask field, a CSI Measurement Request field, a Number of beam sweep cycles field, a CSI Variation Threshold field, and an Evaluation algorithm field. It should be understood that in the embodiments of this application, "TX" represents the transmitting end, and "RX" represents the receiving end. The transmitting end refers to the party that sends the wireless frame in this interaction, and the receiving end refers to the party that receives the wireless frame in this interaction. The transmitting end is not equivalent to the initiating party, and the receiving end is not equivalent to the responding party.

[0260] Among them, the Sensing TX Sector ID field represents the sector identifier that the transmitting end needs to train in the sensing scenario. In the MID stage, the Sensing TX Sector ID field is set to quasi-omni. The Sensing TX Antenna ID Mask field represents the antenna bit map that the transmitting end needs to train in the sensing scenario. The Sensing TX Sector ID field and the Sensing TX Antenna ID Mask field are used to jointly indicate the transmission sector and transmission antenna of the currently transmitted BRP frame.

[0261] The CSI Measurement Request field indicates whether the peer end (here is the second device or the responding party) measures CSI or enables CSI measurement. When the value of the CSI Measurement Request field is the first value, it indicates that the peer end (here is the second device or the responding party) performs CSI measurement on the training unit (TRN Unit) included in the received first BRP PPDU. When the value of the CSI Measurement Request field is the second value, it indicates that the peer end (here is the second device or the responding party) does not perform CSI measurement on the training unit (TRN Unit) included in the received first BRP PPDU.

[0262] The Evaluation algorithm field is used to indicate the evaluation algorithm of CSI. The evaluation algorithm of CSI is used to evaluate (or calculate) the CSI value.

[0263] The "Number of beam sweep cycles" field indicates how many periodic scans are required for the peer device (here, the second device or the responder), that is, the number of receiving beam scan cycles of the peer device. In other words, it indicates how many times the same sector of the same antenna needs to be scanned to receive the first BRP PPDU sent in an omnidirectional manner by the transmitting end. After reaching this number of times, the scanning stops and the CSI difference calculation is performed. For example, when the value of the "Number of beam sweep cycles" field is 0, it means 2 cycles or 2 times; when the value of the "Number of beam sweep cycles" field is 1, it means 3 cycles or 3 times. It should be understood that in the embodiments of the present application, the receiving beam of the receiving end scans at least 2 cycles, so that there will be 2 different CSI values for comparison to obtain the beam information corresponding to the moving target.

[0264] The "CSI Variation Threshold" field is used to indicate the CSI variation threshold. If the CSI difference between the CSI values measured multiple times for the same receiving beam is greater than this CSI variation threshold, it indicates that there is a moving target in the beam scanning area, and the receiving end will store the receiving antenna ID and receiving sector ID corresponding to this receiving beam. On the contrary, if the CSI difference between the CSI values measured multiple times for the same receiving beam is less than or equal to this CSI variation threshold, it indicates that there is no moving target in the beam scanning area. It can be seen that steps S201 and S202 can be used to train the optimal sensing receiving beam of the second device (or the responder).

[0265] It should be understood that in the BRP sensing request element of the first BRP PPDU, the transmitting end involved is the first device (or the initiator), the receiving end is the second device (or the responder), and the peer device is also the second device (or the responder).

[0266] Such as Figure 13 The BRP sensing request element shown also includes one or more of the following fields:

[0267] The element identifier (Element ID), length (Length), and element identifier extension (Element ID Extension) are the general frame formats of the Element frame. In the embodiments of the present application, the Element ID is set to the reserved value 12 to represent the BRP Sensing Request element.

[0268] L-RX: Used to indicate the number of TRN-Units for receiver beam training when receiver beam training is part of the beam refinement process. The number of TRN Units is equal to the L-RX value multiplied by 4. The L-RX field can be used in the BRP setup process, and the value it indicates can be used in the MID process. However, the L-RX field is not mandatory in the MID process.

[0269] L-TX-RX: Used to indicate the number of consecutive TRN Units for which the transmit antenna weight vector (AWV) remains the same AWV configuration during transmit and receive beam refinement, reserved or unused in the MID phase.

[0270] Requested TRN-Unit P: Used to indicate the number of TRN subfields for which the same AWV is requested at the start of a TRN Unit. This AWV is the same as the AWV used for transmitting the preamble and data fields of the physical protocol data unit (PPDU). The Requested TRN-Unit P field can be used in the BRP setup process, and the value it indicates can be used in the MID process. However, the Requested TRN-Unit P field is not mandatory in the MID process.

[0271] Requested EDMG TRN-Unit M: The value of this field plus 1 is used to indicate the requested number of TRN subfields available for TX (initiator) training in a TRN-Unit, reserved or unused in the MID phase. The Requested EDMG TRN-Unit M field can be used in the BRP setup process, and the value it indicates can be used in the MID process. However, the Requested EDMG TRN-Unit M field is not mandatory in the MID process.

[0272] Requested EDMG TRN-Unit N: Indicates the requested number of consecutive TRN subfields transmitted with the same AWV within the EDMG TRN-Unit M, reserved or unused in the MID phase. The Requested EDMG TRN-Unit N field can be used in the BRP setup process, and the value it indicates can be used in the MID process. However, the Requested EDMG TRN-Unit N field is not mandatory in the MID process.

[0273] Beam Refinement Transmit Sector Scan (BRP-TXSS): Indicates a request to perform BRP TXSS or an acknowledgement of a request to perform the BRP TXSS procedure. In the MID phase, this field is set to 0.

[0274] Sensing-TXSS-INITIATOR: If the BRP-TXSS field equals 1, the Sensing-TX-INITIATOR field is set to 1 to indicate that the sender of the BRP frame is the initiator of the BRP TXSS procedure, and the Sensing-TXSS-INITIATOR field is set to 0 to indicate that the sender of the BRP frame is the responder to the BRP TXSS. When the BRP-TXSS field is 0, the Sensing-TXSS-INITIATOR field is a reserved field.

[0275] TXSS-PACKETS: If both the BRP-TXSS field and the Sensing-TXSS-INITIATOR field equal 1, the value of the TXSS-PACKETS field is incremented by 1 to indicate the number of EDMG BRP-TX PPDUs required by the initiator for transmit sector training. If the BRP-TXSS field equals 1 and the Sensing-TXSS-INITIATOR field equals 0, and the procedure includes Responder BRP TXSS, the value of the TXSS-PACKETS field is incremented by 1 to indicate the number of EDMG BRP-TX PPDUs required by the responder for transmit sector training. When the BRP-TXSS field equals 0, the TXSS-PACKETS field is a reserved field.

[0276] TXSS-REPEAT: If both the BRP-TXSS field and the Sensing-TXSS-INITIATOR field equal 1, the value of the TXSS-REPEAT field is incremented by 1 to indicate the number of times the EDMG BRP-TX PPDUs transmitted in the Responder BRP TXSS are repeated if the BRP TXSS includes Responder BRP TXSS. If BRP-TXSS = 1 and Sensing-TXSS-INITIATOR = 0, the value of the TXSS-REPEAT field is incremented by 1 to indicate the number of times the EDMG BRP-TX PPDUs transmitted in the Initiator BRP TXSS are repeated. When BRP-TXSS = 0, the TXSS-REPEAT field is a reserved field.

[0277] TXSS-MIMO: If both the BRP-TXSS field and the Sensing-TXSS-INITIATOR field are equal to 1, the TXSS-MIMO field is set to 1 to indicate that the requested BRP TXSS is MIMO BRP TXSS, and the TXSS-MIMO field is set to 0 to indicate that the requested BRP TXSS is SISO BRP TXSS. If neither the BRP-TXSS field nor the TXSS-INITIATOR field is equal to 1, the TXSS-MIMO field is reserved.

[0278] Sensing BRP CDOWN: Used to indicate how many BRP frames are pending transmission after the current BRP frame.

[0279] Comeback Delay: Used to indicate that the station may not be ready to provide feedback after the beam refinement protocol interframe space (BRPIFS). The value in this field indicates when the device provides feedback.

[0280] Number of self-beam-sweep cycles, which is used to indicate the number of transmission beam sweep cycles of the transmitter and is reserved or not used in the MID phase.

[0281] It should be understood that Figure 13 Fields reserved or not used in the MID phase may not be included in the BRP sensing request element.

[0282] S203. The second device omnidirectionally transmits the second BRP PPDU multiple times, and the second BRP PPDU is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device.

[0283] S204. The first device receives the second BRP PPDU multiple times.

[0284] Optionally, the second device transmits the second BRP PPDU omni-directionally multiple times (transmitting one second BRP PPDU each time, and each second BRP PPDU includes a second BRP frame and a training unit (TRN Unit)). The first device receives the second BRP PPDU in a sector scanning manner, and the first device compares the changes in CSI values when receiving the second BRP PPDU multiple times with the same receiving beam to determine whether there are moving targets in the beam scanning area. The first device records the receiving beams where moving targets are present in the scanned area. The multiple transmissions of the second device can be within one BI or within multiple BIs. It should be understood that the first device receiving the second BRP PPDU in a sector scanning manner can be understood as the first device receiving the second BRP PPDU in a beam polling manner, where each time the second BRP PPDU is received directionally with a beam of a certain width. Among them, the same receiving beam of the first device needs to be received (or scanned) at least 2 times. Therefore, the second device will transmit the second BRP PPDU multiple times. The second BRP frame in the second BRP PPDU is used to instruct the first device (or the peer device) to evaluate the change amount of the CSI from the second device to the first device, or to instruct the peer device (here referring to the first device or the initiator) to start the sensing operation.

[0285] Optionally, the second BRP PPDU is also based on the frame format of the original BRP frame (that is, the BRP frame sent by the responder in the MID stage of the 802.11ay standard), and a new element field is added to enable the initiator (i.e., the first device) to perform sensing receiving beam training. In this application, this newly added element is called the BRP Sensing Request element. It should be understood that this newly added element can also have other names, which are not limited in this application. In other words, the second BRP PPDU includes the BRP Sensing Request element, which is used to instruct the first device (or the peer device) to evaluate the change amount of the CSI from the second device to the first device, or to instruct the peer device (here referring to the first device or the initiator) to start the sensing operation. Among them, the element ID of the BRP Sensing Request element is a reserved value, such as 12.

[0286] It should be understood that the frame format of the second BRP PPDU is the same as that of the foregoing first BRP PPDU. The difference between the second BRP PPDU and the foregoing first BRP PPDU lies in: different sending ends (the second BRP PPDU is sent by the responder (i.e., the second device), and the first BRP PPDU is sent by the initiator (i.e., the first device)); different processes (the second BRP PPDU is in the process of training the receiving beam of the initiator, and the first BRP PPDU is in the process of training the receiving beam of the responder).

[0287] Optionally, each field included in the BRP sensing request element and the frame format of the BRP sensing request element may refer to the relevant descriptions in the foregoing steps S201 and S202, which will not be elaborated here. It should be understood that in steps S203 and S204, the sending end is the second device (or the responder), the receiving end is the first device (or the initiator), and the peer end is also the first device (or the initiator). It should also be understood that steps S203 and S204 are used to train the optimal sensing receiving beam of the first device (or the initiator).

[0288] S205. The first device sends a third BRP frame, which is used to feedback the number of first receiving beams in the beam training of the first device in the beam pairing phase. The number of first receiving beams is the number of receiving beams among all the receiving beams of the first device where the CSI difference between any two CSI measurements on the same receiving beam is greater than the CSI change threshold.

[0289] S206. The second device receives the third BRP frame.

[0290] Optionally, after the receiving ends (or receiving beams) of the initiator and the responder in the MID phase complete training, the first device sends a third BRP frame to the second device, and uses the directional multi-gigabit (DMG) beam refinement element carried in the third BRP frame to feedback its own evaluation result. The third BRP frame includes a DMG beam refinement element, which is used to feedback the number of first receiving beams that the first device needs to perform beam training in the beam pairing (BC) phase (i.e., the next phase). The number of first receiving beams is the number of receiving beams among all the receiving beams of the first device where the CSI difference between any two (or adjacent two) CSI measurements on the same receiving beam is greater than the CSI change threshold. In other words, the DMG beam refinement element is used to feedback the number of receiving beams that need to be trained in the next phase (i.e., the BC phase), and this number can be indicated by the Number of SensingBeams field in the DMG beam refinement element. Among them, the element identifier of the DMG beam refinement element is 5.

[0291] It should be understood that when the change in the CSI value measured during multiple scans of the same receiving beam is greater than the CSI change threshold, it indicates that there is a moving target in the beam scanning area; therefore, the number of first receiving beams can also be understood as the number of receiving beams of the first device that can sense the moving target.

[0292] See Figure 14 , Figure 14It is a schematic diagram of the frame format of the DMG beam refinement element provided by an embodiment of the present application. As Figure 14 shown, the DMG beam refinement element includes a Sensing FBCK-TYPE field, and the Sensing FBCK-TYPE field includes a Number of Sensing Beams field, which is used to feedback the number of receiving beams of the initiator / responder for beam training in the BC phase obtained through training in the MID phase (here it is the above-mentioned first number of receiving beams). The Sensing FBCK-TYPE field also includes a Target Sector ID Order Present field, a Sensing Link Type field, and a Sensing Antenna Type field. These fields are used in the subsequent MIMO training phase and are reserved bits or not used at all in the MID phase. The DMG beam refinement element also includes a Sensing FBCK-REQ field, and the Sensing FBCK-REQ field is also used in the MIMO training phase and is reserved bits or not used at all in the MID phase.

[0293] It should be understood that Figure 14 each field included in the DMG beam refinement element may also have other names, and the embodiments of the present application do not limit this.

[0294] It should also be understood that [[ID= the fields reserved or not used in the MID phase may not be included in the DMG beam refinement element.

[0295] S207. The second device sends a fourth BRP frame, and the fourth BRP frame is used to feedback the second number of receiving beams of the second device's beam training in the beam pairing phase. The second number of receiving beams is the number of receiving beams among all the receiving beams of the second device where the CSI difference between any two CSI measurements on the same receiving beam is greater than the CSI change threshold.

[0296] S208. The first device receives the fourth BRP frame.

[0297] Optionally, the second device sends a fourth BRP frame to the first device, and feeds back its own evaluation result to the first device by using the DMG beam refinement element carried in the fourth BRP frame. The fourth BRP frame includes a DMG beam refinement element, which is used to feedback the number of second receiving beams that the second device needs to perform beam training in the beam pairing (BC) phase (i.e., the next phase). The number of second receiving beams is the number of receiving beams among all the receiving beams of the second device where the CSI difference between any two (or adjacent two) CSI measurements on the same receiving beam is greater than the CSI change threshold. In other words, the DMG beam refinement element is used to feedback the number of receiving beams that need to be trained in the next phase (i.e., the BC phase), and this number can be indicated by the Number of Sensing Beams field in the DMG beam refinement element. Among them, the element identifier of the DMG beam refinement element is 5.

[0298] It should be understood that when the change in the CSI value measured during multiple scans of the same receiving beam is greater than the CSI change threshold, it indicates that there is a moving target in the beam scanning area; therefore, the number of first receiving beams can also be understood as the number of receiving beams of the second device that can sense the moving target.

[0299] It should also be understood that the frame format of the DMG beam refinement element is as described above ​ and will not be elaborated here.

[0300] It can be seen that in the embodiment of the present application, by modifying the relevant frame format in the MID process, the transceiver can train the best receiving beam in the sensing scenario.

[0301] 2. BC process

[0302] After the SLS phase and the MID process, the best transmitting beam and the best receiving beam of the initiator and the responder in the communication and sensing scenarios have been trained. In the BC phase, combined training of the best transmitting beam and the best receiving beam of the initiator and the responder will be performed to obtain the optimal uplink and downlink beam directions.

[0303] See ​ , ​ which is a schematic flowchart of the BC process in the radio frequency sensing method provided by the embodiment of the present application. As ​ shown, the BC process of the radio frequency sensing method includes but is not limited to the following steps:

[0304] S301, the first device sends a fifth beam refinement physical layer protocol data unit BRP PPDU multiple times, and the fifth BRP PPDU is used to indicate the second device to evaluate the change amount of the CSI from the first device to the second device.

[0305] S302, the second device receives the fifth BRP PPDU multiple times.

[0306] Optionally, the first device transmits the fifth BRP PPDU multiple times in a directed manner (transmitting one fifth BRP PPDU each time, with each fifth BRP frame including a fifth BRP frame and a TRN Unit). The second device receives the fifth BRP PPDU multiple times in a directed manner. The second device compares the changes in CSI values when receiving and transmitting the fifth BRP PPDU multiple times for the same transceiver beam pair to determine whether there is a moving target within the beam scanning area. It should be understood that the first device transmitting the fifth BRP PPDU multiple times in a directed manner can be understood as the first device using a beam of a certain width (either the optimal sensing transmission beam obtained through the ISS process or other beams) to transmit the fifth BRP PPDU each time. The second device receiving the fifth BRP PPDU multiple times in a directed manner can be understood as the second device polling to receive the fifth BRP PPDU using multiple optimal sensing receiving beams obtained through the MID process. Among them, the number of times the first device transmits the fifth BRP PPDU in a directed manner is greater than or equal to twice the number of the aforementioned second receiving beams, so as to ensure that the second device polls the optimal sensing receiving beams at least twice, thereby generating two CSI values for each receiving beam for comparison to obtain the beam information corresponding to the moving target. The fifth BRP frame in the fifth BRP PPDU is used to instruct the second device (or the peer) to evaluate the change amount of the CSI from the first device to the second device, or to instruct the peer (here referring to the second device or the responder) to start the sensing operation.

[0307] Optionally, the fifth BRP PPDU includes a BRP Sensing Request element, which is used to instruct the second device (or the peer) to evaluate the change amount of the CSI from the first device to the second device, or to instruct the peer (here referring to the second device or the responder) to start the sensing operation. The element identifier of this BRP Sensing Request element is a reserved value, such as 12.

[0308] Optionally, the BRP sensing request element includes a CSI measurement request field and a number of beam sweep cycles field. When the CSI measurement request field is set to a first value, it is used to indicate that the peer end (here referring to the second device or the responder) measures CSI; when the CSI measurement request field is set to a second value, it is used to indicate that the peer end (here referring to the second device or the responder) does not measure CSI. In the embodiments of the present application, the CSI measurement request field of the first BRP PPDU is set to the first value. If the first value is 0, the second value is 1; if the first value is 1, the second value is 0. The number of beam sweep cycles field is used to indicate the number of receiving beam sweep cycles of the peer end (here referring to the second device or the responder). In other words, the Number of beam sweep cycles field indicates how many times the peer end (here the second device or the responder) needs to perform periodic scans, that is, how many times the same sector and the same antenna need to be scanned to receive the fifth BRP PPDU sent directionally by the sending end (here the initiator or the first device), and stop scanning and perform CSI difference calculation after reaching this number of times.

[0309] The BRP sensing request element further includes one or more of the following fields: a Sensing TX Sector ID field, a Sensing TX Antenna ID Mask field, a CSI Variation Threshold field, and an Evaluation algorithm field. Among them, the Sensing TX Sector ID field and the Sensing TX Antenna ID Mask field are used to jointly indicate the transmission sector and the transmission antenna of the current BRP frame. The CSI Variation Threshold field is used to indicate the CSI variation threshold. The Evaluation algorithm field is used to indicate the evaluation algorithm for CSI. Among them, the transmission sector and the transmission antenna of the current BRP are jointly indicated by the Sensing TX Sector ID field and the Sensing Antenna ID Mask field. The Evaluation algorithm field is used to indicate the evaluation algorithm for CSI. The CSI Variation Threshold field is used to indicate the CSI variation threshold. If the CSI difference between the CSI values measured for the same receiving beam multiple times is greater than the CSI variation threshold, it indicates that there is a moving target within the beam scanning area. Then, the receiving end (here referring to the responder or the second device) will, during the feedback phase, feedback a beam information list (i.e., the second beam information list) composed of the antenna ID and sector ID of the transmission beam corresponding to the CSI difference greater than the CSI variation threshold, and the antenna ID and sector ID of the receiving beam currently used by the responder / second device to the transmitting end (here referring to the initiator or the first device). The transmission beam and the receiving beam with the largest CSI difference are used as the best transceiver beams for downlink sensing.

[0310] It should be understood that each field included in the BRP sensing request element may also have other names, which are not limited in the embodiments of this application.

[0311] It should also be understood that the frame format of the BRP sensing request element is as described above ​ and will not be elaborated here.

[0312] S303. The second device sends the sixth BRP PPDU multiple times, and the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device.

[0313] S304. The first device receives the sixth BRP PPDU multiple times.

[0314] Optionally, the second device transmits the sixth BRP PPDU multiple times in a directed manner (transmitting one sixth BRP PPDU each time, with each sixth BRP frame including a sixth BRP frame and a TRN Unit). The first device receives the sixth BRP PPDU multiple times in a directed manner. The first device compares the changes in CSI values when receiving and transmitting the sixth BRP PPDU multiple times for the same transceiver beam pair to determine whether there are moving targets within the beam scanning area. It should be understood that the second device transmitting the sixth BRP PPDU multiple times in a directed manner can be understood as the second device transmitting the sixth BRP PPDU each time using a beam of a certain width (which can be either the optimal sensing transmission beam obtained through the ISS process or other beams). The first device receiving the sixth BRP PPDU multiple times in a directed manner can be understood as the first device polling to receive the sixth BRP PPDU using multiple optimal sensing receiving beams obtained through the MID process. Among them, the number of times the second device transmits the sixth BRP PPDU in a directed manner is greater than or equal to twice the number of the foregoing first receiving beams, so as to ensure that the first device polls the optimal sensing receiving beams at least twice, thereby generating two CSI values for each receiving beam for comparison to obtain the beam information corresponding to the moving target. The sixth BRP frame in the sixth BRP PPDU is used to instruct the first device (or the peer) to evaluate the change amount of the CSI from the second device to the first device, or to instruct the peer (here referring to the first device or the initiator) to initiate the sensing operation.

[0315] Optionally, the sixth BRP PPDU includes a BRP Sensing Request element, which is used to instruct the first device (or the peer) to evaluate the change amount of the CSI from the second device to the first device, or to instruct the peer (here referring to the first device or the initiator) to initiate the sensing operation. The element identifier of this BRP Sensing Request element is a reserved value, such as 12.

[0316] Optionally, the various fields included in this BRP Sensing Request element and the frame format of this BRP Sensing Request element can refer to the relevant descriptions in the foregoing steps S301 and S302, and will not be elaborated here. It should be understood that in steps S303 and S304, the transmitting end is the second device (or the responder), the receiving end is the first device (or the initiator), and the peer is also the first device (or the initiator). It should also be understood that the transmitting beam and the receiving beam with the largest CSI difference calculated by the receiving end are used as the optimal transceiver beams for uplink sensing.

[0317] S305. The first device transmits a seventh BRP frame carrying a first beam information list, and this first beam information list is used to feedback multiple transmitting beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antennas corresponding to each transmitting beam.

[0318] S306, The second device receives the seventh BRP frame carrying the first beam information list.

[0319] Optionally, in the feedback process of the BC procedure, the first device sends the seventh BRP frame carrying the first beam information list to the second device by adding a new element field to carry the first beam information list on the basis of the frame format of the original BRP frame. In this application, this newly added element is called the Sensing Measurement feedback element field. It should be understood that this newly added element may have other names, which are not limited in this application. Among them, the first beam information list is used to feedback multiple transmission beams and the corresponding receiving antennas of each transmission beam for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

[0320] Optionally, the above first beam information list includes the antenna identifier and sector identifier corresponding to the transmission beam in multiple transceiver beam pairs for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold, and the receiving antenna identifier corresponding to each transmission beam. It should be understood that a transceiver beam pair consists of a transmission beam and a receiving beam. An antenna identifier and a sector identifier can be used to uniquely determine a beam. However, since the receiving beam is used by the receiving end to receive data, the direction of the receiving beam does not need to be informed to the transmitting end and only the receiving end itself needs to know it. Therefore, the sector identifier of the receiving beam may not be included in the first beam information list. In other words, the CSI difference between the CSI values measured by any two transceiver operations using any one of the multiple transceiver beam pairs at both the transceiver ends (the second device and the first device) is greater than the CSI change threshold. That is to say, the difference between the CSI values measured any two times on the multiple transceiver beam pairs is greater than the CSI change threshold.

[0321] Optionally, the element identifier of the above Sensing Measurement feedback element may be a reserved value, such as 13. It should be understood that the 802.11ay standard defines elements with element identifiers (element ID) from 0 to 11, as shown in Table 1 below. On this basis, the embodiments of this application define a BRP sensing request element with an element identifier of 12 and a sensing measurement feedback element with an element identifier of 13. Among them, the frame format of the BRP sensing request element with an element identifier of 12 is as described above ​ as shown, which will not be elaborated here. The sensing measurement feedback element with an element identifier of 13 is located in the seventh BRP frame, and its frame format is as shown in Table 2 below.

[0322] The sensing measurement feedback element shown in Table 2 includes a Sensing Sector ID Order field and a Sensing BRP CDOWN field. The Sensing Sector ID Order field is used to indicate the transmit antenna ID, transmit sector ID, and receive antenna ID in multiple transceiver beam pairs where the CSI difference is greater than the CSI threshold. In other words, the above first beam information list is located in the Sensing Sector ID Order field of the sensing measurement feedback element of the seventh BRP frame. That is to say, the Sensing Sector ID Order field includes multiple groups of identifiers, and one group of identifiers is used to determine a transmit beam and a receive antenna. As shown in Table 2, every three rows of the Sensing Sector ID Order field form a group of identifiers. For example, Sector ID1 / the first value of the Downcounter (CDOWN) (denoted as CDOWN1) / AWV Feedback ID1, TX Antenna ID1, and RX Antenna ID1 form a group of identifiers; Sector ID2 / CDOWN2 / AWV Feedback ID2, TX Antenna ID2, and RX Antenna ID2 form another group of identifiers, and so on. It should be understood that the first row of every three rows in the Sensing Sector ID Order field of the sensing measurement feedback element of the present application is the Sector ID. The order of the multiple groups of identifiers in the Sensing Sector ID Order field is determined according to the magnitude of the CSI change amount (that is, the CSI difference) (different from communication, where sorting is performed according to the SNR magnitude). These multiple groups of identifiers are sorted from largest to smallest according to the CSI change amount, and the antenna ID and sector ID with the largest CSI change amount are in the first place, and so on.

[0323] The Sensing BRP CDOWN field is used to indicate the BRP CDOWN value corresponding to the AWV feedback identifier. It should be understood that in the embodiments of this application, since the Sector ID and TX Antenna ID are used to jointly indicate the transmission beam, there is no AWV Feedback ID, so the Sensing BRP CDOWN field is reserved or not used. In addition, the Element ID, Length, and Element ID Extension shown in Table 2 are the general frame formats of the Element frame. In the embodiments of this application, the Element ID is set to the reserved value 13, which is used to represent the Sensing Measurement feedback element.

[0324] Table 1

[0325]

[0326]

[0327] Table 2

[0328]

[0329]

[0330] S307. The second device sends an eighth BRP frame carrying a second beam information list, where the second beam information list is used to feedback multiple transceiver beam pairs for which the change in the CSI from the first device to the second device is greater than the CSI change threshold.

[0331] S308. The first device receives the eighth BRP frame carrying the second beam information list.

[0332] Optionally, the second device sends an eighth BRP frame carrying a second beam information list to the first device by adding a new element field on the basis of the frame format of the original BRP frame to carry the second beam information list. In this application, this newly added element is called the Sensing Measurement feedback element field. It should be understood that this newly added element can also have other names, which are not limited in this application. Among them, the second beam information list is used to feedback multiple transmission beams for which the change in the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam.

[0333] Optionally, the above second beam information list includes the antenna identifier and sector identifier corresponding to the transmit beam among multiple transceiver beam pairs where the change in the CSI from the first device to the second device is greater than the CSI change threshold, and the receive antenna identifier corresponding to each transmit beam. It should be understood that a transceiver beam pair consists of a transmit beam and a receive beam. An antenna identifier and a sector identifier can be used to uniquely determine a beam. However, since the receive beam is used by the receiving end to receive data, the direction of the receive beam does not need to be informed to the transmit end and only the receiving end needs to know it. Therefore, the sector identifier of the receive beam may not be included in the second beam information list. In other words, the CSI difference between the CSI values obtained by any two transceiver operations using any one of the multiple transceiver beam pairs between the two ends (the second device and the first device) is greater than the CSI change threshold. That is to say, the difference between the CSI values obtained by any two measurements on the multiple transceiver beam pairs is greater than the CSI change threshold.

[0334] Optionally, the element identifier of the above Sensing Measurement feedback element can be a reserved value, such as 13. It should be understood that the 802.11ay standard defines elements with element identifiers from 0 to 11, as shown in Table 1 above. In the embodiments of the present application, on this basis, a BRP sensing request element with an element identifier of 12 and a sensing measurement feedback element with an element identifier of 13 are defined. Among them, the frame format of the BRP sensing request element with an element identifier of 12 is as described above ​ and will not be elaborated here. The sensing measurement feedback element with an element identifier of 13 is located in the seventh BRP frame, and its frame format is as shown in Table 2 above and will not be elaborated here. This second beam information list is located in the Sensing Sector ID Order field of the sensing measurement feedback element in the eighth BRP frame.

[0335] It can be seen that based on the beamforming training (including the SLS phase and the BRP phase) process of the 802.11ay standard, the embodiments of the present application sense by the change in the CSI values measured by scanning the same beam multiple times, and enable the sensing operation and feedback of sensing measurement results by modifying the relevant frame structures in the SLS phase and the BRP phase. It can realize the sensing of a single moving target and the training of the optimal transceiver beam for sensing while the original communication beam is being trained, without the need to specifically design relevant processes for sensing and training sensing beams, with low overhead and good compatibility.

[0336] For a better understanding of ​ the MID process shown and ​ the BC process shown, the following will be illustrated by an example.

[0337] See ​ , ​ which is a timing diagram of the BRP phase provided by an embodiment of the present application. After the SLS phase, the initiator sends a BRP PPDU for the MID process. As ​ shown, the initiator quasi-omnidirectionally sends a BRP PPDU (the BRP PPDU includes a BRP frame and a TRN Unit), and through the BRP PPDU, it instructs the responder to start the sensing operation (or the responder evaluates the change in the CSI from the initiator to the responder). The responder directionally receives in a sector scanning manner and measures the CSI value of the TRN Unit in the received BRP PPDU. The responder compares the change in the CSI value when the same receiving beam scans the same position multiple times to determine whether there is a moving target in the beam scanning area. Then, the responder quasi-omnidirectionally sends a BRP PPDU, and through the BRP PPDU, it instructs the initiator to also perform the corresponding sensing operation (or the initiator evaluates the change in the CSI from the responder to the initiator). The initiator directionally receives in a sector scanning manner and measures the CSI value of the TRN Unit in the received BRP PPDU. The initiator feeds back its measurement result (the number of the first receiving beams) by sending a BRP frame carrying a DMG Beam Refinement element. Similarly, the responder carries its measurement result (the number of the second receiving beams) in the Beam Refinement element of the BRP frame for feedback. Among them, the frame format of each BRP frame in the MID process refers to the description above, and will not be elaborated here.

[0338] After the MID process, the Initiator sends a BRP PPDU directionally, and uses the BRP PPDU to instruct the Responder to evaluate the change in the CSI from the Initiator to the Responder. The Responder receives directionally and measures the CSI value of the TRN Unit in the received BRP PPDU. The Responder compares the changes in the CSI value when the same transceiver beam pair transmits and receives the fifth BRP PPDU multiple times to determine whether there are moving targets in the beam scanning area. Then, the Responder sends a BRP PPDU directionally, and uses the BRP frame to instruct the Initiator to perform corresponding sensing operations (or the Initiator evaluates the change in the CSI from the Responder to the Initiator). The Initiator receives directionally and measures the CSI value of the TRN Unit in the received BRP PPDU. The Initiator feeds back its measurement results (the first beam information list) in the BRP frame. Similarly, the Responder feeds back its measurement results (the second beam information list) in the BRP frame. Among them, the frame format of each BRP frame in the BC process refers to the description in the previous text and will not be elaborated here.

[0339] It should be understood that the main differences between the MID process and the BC process are: the content fed back in the MID process and the BC process is different, and the transceiver methods are different.

[0340] Embodiment 2

[0341] This application's Embodiment 2 mainly introduces the beamforming training process based on the 802.11ay standard, how to design the relevant frame format and feedback process to simultaneously achieve communication beam training and RF sensing in the case of sensing multiple moving targets and requiring feedback of multiple optimal sensing beams.

[0342] It should be understood that when the sensing scenario contains multiple moving targets, it may only be necessary to feedback one optimal sensing beam. When only one optimal sensing beam needs to be fed back, either the technical solution provided in Embodiment 1 or the technical solution provided in Embodiment 2 can be adopted, and this application's embodiments do not limit this.

[0343] Considering the difference in data volume brought by scanning a single moving target and multiple moving targets, since multiple moving targets need to feedback multiple sector identifiers and antenna identifiers, and the reserved bits in each frame during the BRP phase are sufficient to adapt to the situation of multiple moving targets, but the reserved bits in the SSW frame and SSW feedback frame during the SLS phase are limited and cannot feedback multiple sector identifiers and antenna identifiers simultaneously. Therefore, the radio frequency sensing method provided in the second embodiment of this application adds a sensing feedback process between the SLS phase and the BRP phase to feedback the sensing measurement results of the ISS process and the RSS process.

[0344] Specifically, referring to ​ , ​ is another schematic flowchart of the radio frequency sensing method provided in the embodiment of this application. As ​ shown, the ISS process includes steps S401 and S402, which can be used to train the best sensing transmission beam of the first device (or initiator); the RSS process includes steps S403 and S404, which can be used to train the best sensing transmission beam of the second device (or responder); the sensing feedback process includes steps S405 to S408, which can be used to feedback the best sensing transmission beams obtained from the ISS process and the RSS process.

[0345] As ​ shown, the radio frequency sensing method includes but is not limited to the following steps:

[0346] S401, the first device sends multiple first frames, and each first frame includes first indication information, which is used to indicate the second device to evaluate the change amount of the channel state information CSI from the first device to the second device.

[0347] S402, the second device quasi-omnidirectionally receives multiple first frames.

[0348] Optionally, the implementation manners of steps S401 and S402 in the embodiment of this application can refer to the implementation manners of steps S101 and S102 in the foregoing ​ shown embodiment, which will not be elaborated here.

[0349] S403, the second device sends multiple second frames, and each second frame includes second indication information, which is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device.

[0350] S404, the first device quasi-omnidirectionally receives multiple second frames.

[0351] Optionally, the implementation manners of steps S403 and S404 in the embodiment of this application can refer to the implementation manners of the foregoing ​For the corresponding descriptions in steps S103 and S104 of the illustrated embodiment, they will not be elaborated here. It should be understood that since the second frame in the embodiment of the present application does not carry the first measurement result, the SNR report subfield of the second frame in the embodiment of the present application is used to indicate the SNR of the communication best beam.

[0352] S405. The first device sends a first sensing feedback frame, and the first sensing feedback frame includes a second measurement result, and the second measurement result is used to feedback multiple transmission beams for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

[0353] S406. The second device receives the first sensing feedback frame.

[0354] Optionally, before step S405, the radio frequency sensing method provided by the embodiment of the present application further includes an SSW feedback process, that is, the first device sends an SSW feedback frame, and the second device receives the SSW feedback frame. This SSW feedback process is the same as the SSW feedback process in the 802.11ay standard, and the specific implementation method refers to the relevant descriptions in the 802.11ay standard, which will not be elaborated in the embodiment of the present application.

[0355] Optionally, after the SSW feedback process, the first device sends a first sensing feedback frame, and the second device receives the first sensing feedback frame. The first sensing feedback frame includes a second measurement result, which is used to feedback multiple transmission beams for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold. That is to say, the second measurement result is used to feedback the result evaluated by the first device, or is used to feedback the sensing measurement result in the RSS stage (for example, multiple antenna identifiers and multiple sector identifiers corresponding to a moving target).

[0356] Optionally, the above second measurement result includes multiple groups of second beam identifiers, and a group of second beam identifiers includes a second antenna identifier and a second sector identifier. The beam determined by a group of second beam identifiers is a transmission beam for which the CSI difference between any two CSI measurements on the same transmission beam among all the transmission beams of the second device is greater than the CSI change threshold.

[0357] See ​ , ​ is a schematic diagram of the frame format of the first sensing feedback frame provided by the embodiment of the present application. As ​As shown, the first sensing feedback frame includes a frame control field, a duration field, a Receiver Address (RA) field, a Transmitter Address (TA) field, a target sector in order field, and a frame check sequence (FCS) field. Among them, the target sector in order field includes a plurality of target antenna identification sub-fields and a plurality of target sector identification sub-fields. One target antenna identification sub-field is used to indicate a second antenna identification, and one target sector identification sub-field is used to indicate a second sector identification. In other words, the above-mentioned second measurement result is carried in the target sector in order field of the first sensing feedback frame. ​ In it, the target antenna ID1 and the target sector ID1 represent a set of second beam identifications.

[0358] It should be understood that ​ each field included in the first sensing feedback frame may have other names, and the embodiments of the present application do not limit this.

[0359] S407. The second device sends a second sensing feedback frame, and the second sensing feedback frame includes a first measurement result, which is used to feedback multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold.

[0360] S408. The first device receives the second sensing feedback frame.

[0361] Optionally, similar to the foregoing steps S405 and S406, the second device sends a second sensing feedback frame, and the first device receives the second sensing feedback frame. The second sensing feedback frame includes a first measurement result, which is used to feedback multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold. That is to say, the first measurement result is used to feedback the result evaluated by the second device, or is used to feedback the sensing measurement result in the ISS stage (for example, multiple antenna identifications and multiple sector identifications corresponding to a moving target).

[0362] Optionally, the above-mentioned first measurement result includes multiple groups of first beam identifications, and a group of first beam identifications includes a first antenna identification and a first sector identification. The beam determined by a group of first beam identifications is a transmission beam among all the transmission beams of the first device, and the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold.

[0363] Optionally, the frame format of the second sensing feedback frame is the same as that of the aforementioned first sensing feedback frame, and reference can be made to the foregoing ​ as shown.

[0364] It can be seen that in the embodiment of the present application, by adding a sensing feedback process (the aforementioned steps S405 to S408), the problem that the beam information feedback of multiple targets cannot be realized due to insufficient reserved bits in the SLS stage is solved, thereby realizing the sensing of multiple moving targets and training the best transceiver beams for sensing each moving target. There is no need to specifically design relevant processes for sensing and training sensing beams, with relatively small overhead and good compatibility.

[0365] After the above step S408, the radio frequency sensing method provided by the embodiment of the present application further includes a BRP stage.

[0366] In one implementation manner, ​ the BRP stage in the method shown is the same as the BRP stage of beamforming training in the 802.11ay standard. The specific process and the frame format involved can refer to the description in the 802.11ay standard and will not be elaborated here.

[0367] In another implementation manner, ​ the MID process included in the BRP stage in the method shown can refer to the foregoing ​ as shown, and the BC process can refer to the foregoing ​ as shown, and will not be further elaborated here. In other words, the difference between the embodiment of the present application and the foregoing Embodiment 1 is that in the embodiment of the present application, the SSW frame and the SSW feedback frame no longer feed back the sensing measurement results of the RSS process and the ISS process (the antenna identifier and sector identifier corresponding to the moving target), and the sensing measurement results of the RSS process and the ISS process are uniformly fed back in the newly added sensing feedback process.

[0368] For a better understanding of ​ the process of the method shown, the following is illustrated by an example.

[0369] In an example, refer to ​ , ​ which is a timing diagram of the radio frequency sensing method provided by the embodiment of the present application. Since the reserved bits of the original feedback field (SSW feedback field) in the SLS stage are insufficient, the SSW frame and the SSW feedback frame no longer feed back the sensing measurement results of the RSS process and the ISS process, and are uniformly fed back in the newly added sensing feedback process. As ​As shown, after the SSW feedback process, a sensing feedback process is added to feedback the beam information (sector identifier and antenna identifier) corresponding to multiple targets in the SLS stage. In the subsequent BRP stage, since the BRP frame can feedback multiple beam information (sector identifier and antenna identifier), there is no need to modify it, that is, it is ​ consistent with the foregoing. In the sensing feedback process, the initiator and the responder send a sensing feedback frame to the peer to feedback the sector and antenna information corresponding to multiple targets by comparing the changes in CSI values during multiple scans of the same beam in the SLS stage. It should be understood that ​ shows that the initiator sends an SSW frame during the ISS process. In practical applications, the situation where the initiator sends a beacon frame during the ISS process is ​ similar, which will not be elaborated here.

[0370] The above content elaborates in detail the method provided in this application. To facilitate better implementation of the above solutions of the embodiments of this application, the embodiments of this application also provide corresponding devices or equipment.

[0371] The embodiments of this application can divide the first device and the second device into functional modules according to the above method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. It should be noted that the division of modules in the embodiments of this application is illustrative, and is only a logical function division. There may be other division methods in actual implementation.

[0372] In the case of adopting an integrated unit, refer to ​ , ​ is a schematic structural diagram of the first device provided by the embodiments of this application. As ​ shown, the first device includes: a sending unit 11 and a receiving unit 12.

[0373] In a design, the sending unit 11 is configured to send multiple first frames, each first frame including first indication information for indicating a second device to evaluate a change amount of the CSI from the first device to the second device; the receiving unit 12 is configured to omnidirectionally receive multiple second frames, each second frame including a first measurement result and second indication information, the first measurement result being used to feedback a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information being used to indicate the first device to evaluate a change amount of the CSI from the second device to the first device; the sending unit 11 is further configured to send a third frame, the third frame including a second measurement result, the second measurement result being used to feedback a transmission beam for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0374] Optionally, the first device further includes a processing unit 13 configured to generate multiple first frames; the processing unit 13 is further configured to generate a third frame.

[0375] Optionally, the above-mentioned sending unit 11 is further configured to omnidirectionally send a first BRP PPDU multiple times, the first BRP frame included in the first BRP PPDU being used to indicate the second device to evaluate a change amount of the CSI from the first device to the second device; the above-mentioned receiving unit 12 is further configured to receive a second BRP PPDU multiple times, the second BRP frame included in the second BRP PPDU being used to indicate the first device to evaluate a change amount of the CSI from the second device to the first device; the above-mentioned sending unit 11 is further configured to send a third BRP frame, the third BRP frame being used to feedback a first received beam quantity in beam training of the first device in a beam pairing phase, the first received beam quantity being the quantity of received beams among all received beams of the first device for which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold; the above-mentioned receiving unit 12 is further configured to receive a fourth BRP frame, the fourth BRP frame being used to feedback a second received beam quantity in beam training of the second device in a beam pairing phase, the second received beam quantity being the quantity of received beams among all received beams of the second device for which the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold.

[0376] Optionally, the above-mentioned processing unit 13 is further configured to generate a first BRP PPDU and a third BRP frame.

[0377] Wherein, each first BRP PPDU includes a first BRP frame and a training unit (TRNUnit). Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0378] Optionally, the above-mentioned sending unit 11 is further configured to send the fifth BRP PPDU multiple times. The fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device. The above-mentioned receiving unit 12 is further configured to receive the sixth BRP PPDU multiple times. The sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The above-mentioned sending unit 11 is further configured to send a seventh BRP frame carrying a first beam information list. The first beam information list is used to feedback multiple sending beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam. The above-mentioned receiving unit 12 is further configured to receive an eighth BRP frame carrying a second beam information list. The second beam information list is used to feedback multiple sending beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam.

[0379] Optionally, the above-mentioned processing unit 13 is further configured to generate the fifth BRP PPDU and the seventh BRP frame carrying the first beam information list. Each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0380] Wherein, the above-mentioned sending unit 11 and the above-mentioned receiving unit 12 can be integrated into one module, such as a transceiver module.

[0381] It should be understood that the first device in this design can correspondingly execute the first method embodiment described above, and the above operations or functions of each unit in the first device are respectively for implementing the corresponding operations in the first method embodiment described above. For the technical effects, please refer to the technical effects in the first embodiment described above. For the sake of brevity, they will not be elaborated here.

[0382] In another design, the sending unit 11 is configured to send multiple first frames, each first frame including first indication information for indicating a second device to evaluate a change amount of the CSI from the first device to the second device; the receiving unit 12 is configured to omnidirectionally receive multiple second frames, each second frame including second indication information for indicating the first device to evaluate a change amount of the CSI from the second device to the first device; the sending unit 11 is further configured to send a first sensing feedback frame, the first sensing feedback frame including a second measurement result for feeding back multiple transmission beams whose change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the receiving unit 12 is further configured to receive a second sensing feedback frame, the second sensing feedback frame including a first measurement result for feeding back multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0383] Optionally, the first device further includes a processing unit 13 configured to generate multiple first frames; the processing unit 13 is further configured to generate a first sensing feedback frame.

[0384] Optionally, the above-mentioned sending unit 11 is further configured to omnidirectionally send a first BRP PPDU multiple times, the first BRP frame included in the first BRP PPDU is used to indicate the second device to evaluate a change amount of the CSI from the first device to the second device; the above-mentioned receiving unit 12 is further configured to receive a second BRP PPDU multiple times, the second BRP frame included in the second BRP PPDU is used to indicate the first device to evaluate a change amount of the CSI from the second device to the first device; the above-mentioned sending unit 11 is further configured to send a third BRP frame, the third BRP frame is used to feed back a first received beam number of beam training of the first device in a beam pairing phase, the first received beam number is the number of received beams among all received beams of the first device where the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold; the above-mentioned receiving unit 12 is further configured to receive a fourth BRP frame, the fourth BRP frame is used to feed back a second received beam number of beam training of the second device in a beam pairing phase, the second received beam number is the number of received beams among all received beams of the second device where the CSI difference between any two CSI measurements on the same received beam is greater than a CSI change threshold.

[0385] Optionally, the above-mentioned processing unit 13 is further configured to generate a first BRP PPDU and a third BRP frame.

[0386] Among them, each first BRP PPDU includes a first BRP frame and a training unit (TRNUnit). Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0387] Optionally, the above-mentioned sending unit 11 is further configured to send the fifth BRP PPDU multiple times. The fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device. The above-mentioned receiving unit 12 is further configured to receive the sixth BRP PPDU multiple times. The sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The above-mentioned sending unit 11 is further configured to send a seventh BRP frame carrying a first beam information list. The first beam information list is used to feedback multiple sending beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam. The above-mentioned receiving unit 12 is further configured to receive an eighth BRP frame carrying a second beam information list. The second beam information list is used to feedback multiple sending beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each sending beam.

[0388] Optionally, the above-mentioned processing unit 13 is further configured to generate a fifth BRP PPDU and a seventh BRP frame carrying a first beam information list. Each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0389] Among them, the above-mentioned sending unit 11 and the above-mentioned receiving unit 12 can be integrated into one module, such as a transceiver module.

[0390] It should be understood that the first device in this design can correspondingly execute the second method embodiment described above, and the above operations or functions of each unit in the first device are respectively for implementing the corresponding operations in the second method embodiment described above. For the technical effects, please refer to the technical effects in the second embodiment described above. For the sake of brevity, they will not be elaborated here.

[0391] See ​ , ​ is a schematic structural diagram of the second device provided by the embodiment of the present application. As ​ shown, the second device includes: a receiving unit 21 and a sending unit 22.

[0392] In a design, the receiving unit 21 is configured to omnidirectionally receive a plurality of first frames, each of the first frames including first indication information for indicating the second device to evaluate the change amount of the CSI from the first device to the second device; the transmitting unit 22 is configured to transmit a plurality of second frames, each of the second frames including a first measurement result and second indication information, the first measurement result being used to feedback a transmission beam whose change amount of the CSI from the first device to the second device is greater than a CSI change threshold, and the second indication information being used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; the receiving unit 21 is further configured to receive a third frame, the third frame including a second measurement result, the second measurement result being used to feedback a transmission beam whose change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0393] Optionally, the second device further includes a processing unit 23 configured to generate a plurality of second frames.

[0394] Optionally, the above receiving unit 21 is further configured to receive a first BRP PPDU multiple times, the first BRP frame included in the first BRP PPDU being used to indicate the second device to evaluate the change amount of the CSI from the first device to the second device; the above transmitting unit 22 is further configured to omnidirectionally transmit a second BRP PPDU multiple times, the second BRP frame included in the second BRP PPDU being used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; the above receiving unit 21 is further configured to receive a third BRP frame, the third BRP frame being used to feedback the number of first receiving beams in the beam training of the first device in the beam pairing phase, the number of first receiving beams being the number of receiving beams in all receiving beams of the first device where the CSI difference between any two CSI measurements on the same receiving beam is greater than a CSI change threshold; the above transmitting unit 22 is further configured to transmit a fourth BRP frame, the fourth BRP frame being used to feedback the number of second receiving beams in the beam training of the second device in the beam pairing phase, the number of second receiving beams being the number of receiving beams in all receiving beams of the second device where the CSI difference between any two CSI measurements on the same receiving beam is greater than a CSI change threshold.

[0395] Optionally, the above processing unit 23 is further configured to generate a second BRP PPDU and a fourth BRP frame.

[0396] Wherein, each first BRP PPDU includes a first BRP frame and a training unit (TRNUnit). Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0397] Optionally, the above receiving unit 21 is further configured to receive the fifth BRP PPDU multiple times. The fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device. The above sending unit 22 is further configured to send the sixth BRP PPDU multiple times. The sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The above receiving unit 21 is further configured to receive a seventh BRP frame carrying a first beam information list. The first beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam. The above sending unit 22 is further configured to send an eighth BRP frame carrying a second beam information list. The second beam information list is used to feedback multiple transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam.

[0398] Optionally, the above processing unit 23 is further configured to generate the sixth BRP PPDU and the eighth BRP frame carrying the second beam information list. Each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer end to perform CSI measurement.

[0399] Wherein, the above receiving unit 21 and the above sending unit 22 may be integrated into one module, such as a transceiver module.

[0400] It should be understood that the second device in this design can correspondingly execute the foregoing first method embodiment, and the above operations or functions of each unit in the second device are respectively for implementing the corresponding operations in the foregoing first method embodiment. For the technical effects, refer to the technical effects in the foregoing first embodiment. For the sake of brevity, they will not be elaborated here.

[0401] In another design, the receiving unit 21 is configured to quasi-omnidirectionally receive a plurality of first frames, each first frame including first indication information for indicating the second device to evaluate the change amount of the CSI from the first device to the second device; the sending unit 22 is configured to send a plurality of second frames, each second frame including second indication information for indicating the first device to evaluate the change amount of the CSI from the second device to the first device; the receiving unit 21 is further configured to receive a first sensing feedback frame, the first sensing feedback frame including a second measurement result for feeding back a plurality of transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold; the sending unit 22 is further configured to send a second sensing feedback frame, the second sensing feedback frame including a first measurement result for feeding back a plurality of transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold.

[0402] Optionally, the second device further includes a processing unit 23 for generating a plurality of second frames; the processing unit 13 is further configured to generate a second sensing feedback frame.

[0403] Optionally, the above-mentioned receiving unit 21 is further configured to receive a first BRP PPDU multiple times, the first BRP frame included in the first BRP PPDU is used to indicate the second device to evaluate the change amount of the CSI from the first device to the second device; the above-mentioned sending unit 22 is further configured to quasi-omnidirectionally send a second BRP PPDU multiple times, the second BRP frame included in the second BRP PPDU is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; the above-mentioned receiving unit 21 is further configured to receive a third BRP frame, the third BRP frame is used to feed back the number of first receiving beams in the beam training of the first device in the beam pairing phase, and the number of first receiving beams is the number of receiving beams among all the receiving beams of the first device where the CSI difference between any two CSI measurements on the same receiving beam is greater than the CSI change threshold; the above-mentioned sending unit 22 is further configured to send a fourth BRP frame, the fourth BRP frame is used to feed back the number of second receiving beams in the beam training of the second device in the beam pairing phase, and the number of second receiving beams is the number of receiving beams among all the receiving beams of the second device where the CSI difference between any two CSI measurements on the same receiving beam is greater than the CSI change threshold.

[0404] Optionally, the above-mentioned processing unit 23 is further configured to generate a second BRP PPDU and a fourth BRP frame.

[0405] Among them, each first BRP PPDU includes a first BRP frame and a training unit (TRNUnit). Similarly, each second BRP PPDU includes a second BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0406] Optionally, the above receiving unit 21 is further configured to receive the fifth BRP PPDU multiple times. The fifth BRP frame included in the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device. The above sending unit 22 is further configured to send the sixth BRP PPDU multiple times. The sixth BRP frame included in the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The above receiving unit 21 is further configured to receive a seventh BRP frame carrying a first beam information list. The first beam information list is used to feedback multiple transmitting beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmitting beam. The above sending unit 22 is further configured to send an eighth BRP frame carrying a second beam information list. The second beam information list is used to feedback multiple transmitting beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmitting beam.

[0407] Optionally, the above processing unit 23 is further configured to generate a sixth BRP PPDU and an eighth BRP frame carrying a second beam information list. Each fifth BRP PPDU includes a fifth BRP frame and a TRN Unit. Similarly, each sixth BRP PPDU includes a sixth BRP frame and a TRN Unit. The TRN Unit is used for the peer to perform CSI measurement.

[0408] Among them, the above receiving unit 21 and the above sending unit 22 may be integrated into a module, such as a transceiver module.

[0409] It should be understood that the second device in this design can correspondingly execute the second method embodiment described above, and the above operations or functions of each unit in the second device are respectively for implementing the corresponding operations in the second method embodiment described above. For the technical effects, refer to the technical effects in the second embodiment described above. For the sake of brevity, they will not be elaborated here.

[0410] The first device and the second device of the embodiments of the present application are introduced above. The following introduces the possible product forms of the first device and the second device. It should be understood that any form of product that has the function of the first device described above ​ Any form of product that has the function of the first device described above ​Any form of product with the functions of the second device described above falls within the protection scope of the embodiments of this application. It should also be understood that the following introduction is only for illustration, and does not limit the product forms of the first device and the second device in the embodiments of this application to this.

[0411] As a possible product form, the first device and the second device described in the embodiments of this application can be implemented by a general bus architecture.

[0412] The first device includes a processor and a transceiver that is internally connected and communicates with the processor.

[0413] In one design, the transceiver is used to send multiple first frames, and each first frame includes first indication information, which is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the transceiver is also used to quasi-omnidirectionally receive multiple second frames, and each second frame includes a first measurement result and second indication information, the first measurement result is used to feedback a transmission beam whose CSI change amount from the first device to the second device is greater than the CSI change threshold, and the second indication information is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the transceiver is also used to send a third frame, and the third frame includes a second measurement result, which is used to feedback a transmission beam whose CSI change amount from the second device to the first device is greater than the CSI change threshold.

[0414] Optionally, the processor is used to generate multiple first frames; the processor is also used to generate the third frame.

[0415] In another design, the transceiver is used to send multiple first frames, and each first frame includes first indication information, which is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; the transceiver is also used to quasi-omnidirectionally receive multiple second frames, and each second frame includes second indication information, which is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; the transceiver is also used to send a first perception feedback frame, and the first perception feedback frame includes a second measurement result, which is used to feedback multiple transmission beams whose CSI change amount from the second device to the first device is greater than the CSI change threshold; the transceiver is also used to receive a second perception feedback frame, and the second perception feedback frame includes a first measurement result, which is used to feedback multiple transmission beams whose CSI change amount from the first device to the second device is greater than the CSI change threshold.

[0416] Optionally, the processor is used to generate multiple first frames; the processor is also used to generate the first perception feedback frame.

[0417] A second device, including a processor and a transceiver that is internally connected to and communicates with the processor.

[0418] In one design, the transceiver is configured to omnidirectionally receive a plurality of first frames, each of the first frames including first indication information for instructing the second device to evaluate a change amount of the CSI from the first device to the second device; the transceiver is further configured to send a plurality of second frames, each of the second frames including a first measurement result and second indication information, the first measurement result being used to feedback a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold, the second indication information being used to instruct the first device to evaluate a change amount of the CSI from the second device to the first device; the transceiver is further configured to receive a third frame, the third frame including a second measurement result, the second measurement result being used to feedback a transmission beam for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold.

[0419] Optionally, the processor is configured to generate a plurality of second frames.

[0420] In another design, the transceiver is configured to omnidirectionally receive a plurality of first frames, each of the first frames including first indication information for instructing the second device to evaluate a change amount of the CSI from the first device to the second device; the transceiver is further configured to send a plurality of second frames, each of the second frames including second indication information for instructing the first device to evaluate a change amount of the CSI from the second device to the first device; the transceiver is further configured to receive a first sensing feedback frame, the first sensing feedback frame including a second measurement result, the second measurement result being used to feedback a plurality of transmission beams for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold; the transceiver is further configured to send a second sensing feedback frame, the second sensing feedback frame including a first measurement result, the first measurement result being used to feedback a plurality of transmission beams for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold.

[0421] Optionally, the processor is configured to generate a plurality of second frames; the processor is further configured to generate a second sensing feedback frame.

[0422] As a possible product form, the first device and the second device described in the embodiments of the present application may be implemented by a general-purpose processor.

[0423] The general-purpose processor for implementing the first device includes a processing circuit and an input / output interface that is internally connected to and communicates with the processing circuit.

[0424] In a design, an input / output interface is used to send multiple first frames. Each first frame includes first indication information, which is used to instruct a second device to evaluate the change amount of the channel state information (CSI) from the first device to the second device. The input / output interface is further configured to quasi-omnidirectionally receive multiple second frames. Each second frame includes a first measurement result and second indication information. The first measurement result is used to feedback a transmission beam for which the change amount of the CSI from the first device to the second device is greater than a CSI change threshold. The second indication information is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The input / output interface is further configured to send a third frame, which includes a second measurement result. The second measurement result is used to feedback a transmission beam for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

[0425] Optionally, a processing circuit is configured to generate multiple first frames. The processing circuit is further configured to generate a third frame.

[0426] In another design, an input / output interface is configured to send multiple first frames. Each first frame includes first indication information, which is used to instruct a second device to evaluate the change amount of the CSI from the first device to the second device. The input / output interface is further configured to quasi-omnidirectionally receive multiple second frames. Each second frame includes second indication information, which is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The input / output interface is further configured to send a first perception feedback frame, which includes a second measurement result. The second measurement result is used to feedback multiple transmission beams for which the change amount of the CSI from the second device to the first device is greater than a CSI change threshold. The input / output interface is further configured to receive a second perception feedback frame, which includes a first measurement result. The first measurement result is used to feedback multiple transmission beams for which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold.

[0427] Optionally, a processing circuit is configured to generate multiple first frames. The processing circuit is further configured to generate a first perception feedback frame.

[0428] A general-purpose processor of the second device includes a processing circuit and an input / output interface that is internally connected and communicates with the processing circuit.

[0429] In one design, an input / output interface is used to quasi-omnidirectionally receive multiple first frames. Each first frame includes first indication information, which is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device. The input / output interface is further configured to send multiple second frames. Each second frame includes a first measurement result and second indication information. The first measurement result is used to feedback a transmission beam for which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold. The second indication information is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The input / output interface is further configured to receive a third frame, which includes a second measurement result used to feedback a transmission beam for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

[0430] Optionally, a processing circuit is configured to generate multiple second frames.

[0431] In another design, an input / output interface is used to quasi-omnidirectionally receive multiple first frames. Each first frame includes first indication information, which is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device. The input / output interface is further configured to send multiple second frames. Each second frame includes second indication information, which is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device. The input / output interface is further configured to receive a first sensing feedback frame, which includes a second measurement result used to feedback multiple transmission beams for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold. The input / output interface is further configured to send a second sensing feedback frame, which includes a first measurement result used to feedback multiple transmission beams for which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold.

[0432] Optionally, a processing circuit is configured to generate multiple second frames; the processing circuit is further configured to generate a second sensing feedback frame.

[0433] It should be understood that the apparatuses or devices in the above various product forms have any functions of the first device or the second device in the above method embodiments, which will not be elaborated here.

[0434] An embodiment of this application further provides a computer-readable storage medium, in which computer program code is stored. When the above-mentioned processor executes the computer program code, the electronic device executes the method in any of the foregoing embodiments.

[0435] The embodiments of the present application also provide a computer program product. When the computer program product runs on a computer, the computer is enabled to execute the method in any of the foregoing embodiments.

[0436] The embodiments of the present application also provide a communication device. The device may exist in the form of a chip product. The structure of the device includes a processor and an interface circuit. The processor is used to communicate with other devices through a receiving circuit, so that the device executes the method in any of the foregoing embodiments.

[0437] The embodiments of the present application also provide a wireless communication system, including a first device and a second device. The first device and the second device can execute the method in any of the foregoing embodiments.

[0438] The steps of the method or algorithm described in combination with the disclosure of the present application can be implemented in a hardware manner or by a processor executing software instructions. The software instructions may consist of corresponding software modules. The software modules may be stored in a random access memory (RAM), a flash memory, an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a register, a hard disk, a removable hard disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may be located in an ASIC. Additionally, the ASIC may be located in a core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

[0439] Those skilled in the art should be able to realize that in one or more of the above examples, the functions described in the present application can be implemented by hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. The computer-readable medium includes a computer-readable storage medium and a communication medium, where the communication medium includes any medium facilitating the transmission of a computer program from one place to another. The storage medium may be any available medium accessible by a general-purpose or special-purpose computer.

[0440] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present application. It should be understood that the above description is only the specific embodiments of the present application and is not used to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solution of the present application shall be included within the protection scope of the present application.

Claims

1. A radio frequency sensing method, characterized in that, Including: The first device sends multiple first frames in a sector scanning manner. The same transmission beam is sent at least twice, with one first frame sent each time. Each first frame includes first indication information, and the first indication information is used to indicate the second device to evaluate the change amount of the channel state information (CSI) from the first device to the second device; The first device omni-directionally receives multiple second frames. Each second frame includes a first measurement result and second indication information. The first measurement result is used to feedback a transmission beam whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold, and the second indication information is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; The first device sends a third frame, and the third frame includes a second measurement result. The second measurement result is used to feedback a transmission beam whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

2. The method according to claim 1, characterized in that, The first frame is a beacon frame, and the first indication information is located in an optional sub-element sub-field of the enhanced directional multi-gigabit (EDMG) capability field of the beacon frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and also includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Among them, the value of the CSI measurement request field is a first value, which is used to indicate the second device to measure CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of CSI; the CSI change threshold field is used to indicate the CSI change threshold; the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

3. The method according to claim 1, wherein The first frame is a sector sweep (SSW) frame, and the first indication information is carried in a reserved sub-field of the SSW feedback field of the SSW frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and also includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Among them, the value of the CSI measurement request field is a first value, which is used to indicate the second device to measure CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of CSI, the CSI change threshold field is used to indicate the CSI change threshold, and the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

4. The method according to any one of claims 1 to 3, characterized in that The second frame is an SSW frame, and the second indication information is located in a reserved sub-field of the SSW feedback field of this SSW frame; The first measurement result is located in the signal-to-noise ratio (SNR) report sub-field of the SSW feedback field of the SSW frame; Among them, the second indication information includes a CSI difference calculation field, and the CSI difference calculation field is used to indicate whether the first device calculates the CSI difference.

5. The method according to any one of claims 1 to 3, characterized in that, The second frame further includes third indication information, and the third indication information is used to indicate whether the first measurement result is included in the second frame.

6. The method according to any one of claims 1-3, characterized in that, The third frame is an SSW feedback frame, and the second measurement result is located in the SNR report sub-field of the SSW feedback field of the SSW feedback frame.

7. The method according to any one of claims 1 to 3, characterized in that The third frame further includes fourth indication information, and the fourth indication information is used to indicate whether the second measurement result is included in the third frame.

8. The method according to any one of claims 1 to 3, characterized in that The first measurement result includes a first antenna identifier and a first sector identifier, and the second measurement result includes a second antenna identifier and a second sector identifier; The beam determined by the first antenna identifier and the first sector identifier is the beam among all the transmission beams of the first device where the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold; The beam determined by the second antenna identifier and the second sector identifier is the beam among all the transmission beams of the second device where the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold.

9. The method according to claim 1, wherein After the first device sends the third frame, the method further includes: The first device quasi-omnidirectionally and repeatedly sends a first beam refinement protocol (BRP) physical layer protocol data unit (PPDU), and the first BRP PPDU is used to indicate that the second device evaluates the change amount of the CSI from the first device to the second device; The first device repeatedly receives a second BRP PPDU, and the second BRP PPDU is used to indicate that the first device evaluates the change amount of the CSI from the second device to the first device; The first device sends a third BRP frame, and the third BRP frame is used to feedback the number of first received beams in the beam training of the first device in the beam pairing phase, and the number of first received beams is the number of received beams among all the received beams of the first device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold; The first device receives a fourth BRP frame, and the fourth BRP frame is used to feedback the number of second received beams in the beam training of the second device in the beam pairing phase, and the number of second received beams is the number of received beams among all the received beams of the second device where the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold.

10. The method according to claim 9, wherein After the first device receives the fourth BRP frame, the method further includes: The first device repeatedly sends a fifth BRP PPDU, and the fifth BRP PPDU is used to indicate that the second device evaluates the change amount of the CSI from the first device to the second device; The first device receives the sixth BRP PPDU multiple times, and the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; The first device sends a seventh BRP frame carrying a first beam information list, and the first beam information list is used to feedback multiple transmit beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receive antenna corresponding to each transmit beam; The first device receives an eighth BRP frame carrying a second beam information list, and the second beam information list is used to feedback multiple transmit beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receive antenna corresponding to each transmit beam.

11. The method according to claim 9 or 10, characterized in that, Both the first BRP PPDU and the second BRP PPDU include a CSI measurement request field and a beam scan circle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan circle number field is used to indicate the number of scan circles of the receive beam; The first BRP PPDU and the second BRP PPDU further include one or more of the following fields: A transmitter sensing sector identification field and a transmitter sensing antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

12. The method according to claim 9 or 10, characterized in that, The first receive beam quantity is carried in the directional multi-gigabit (DMG) beam refinement element of the third BRP frame; The second receive beam quantity is carried in the DMG beam refinement element of the fourth BRP frame.

13. The method according to claim 10, characterized in that, Both the fifth BRP PPDU and the sixth BRP PPDU include a CSI measurement request field and a beam scan circle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan circle number field is used to indicate the number of scan circles of the receive beam; The fifth BRP PPDU and the sixth BRP PPDU further include one or more of the following fields: A transmitter sensing sector identification field and a transmitter sensing antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

14. The method according to claim 10, wherein The first beam information list is located in the sensing measurement feedback element of the seventh BRP frame; The second beam information list is located in the sensing measurement feedback element of the eighth BRP frame.

15. A radio frequency sensing method, characterized in that, Including: The second device quasi-omnidirectionally receives a plurality of first frames, and each first frame includes first indication information, and the first indication information is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; The second device sends multiple second frames in a sector scanning manner. The same transmission beam is sent at least twice, with one second frame sent each time. Each second frame includes a first measurement result and second indication information. The first measurement result is used to feedback a transmission beam for which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold. The second indication information is used to indicate that the first device evaluates the change amount of the CSI from the second device to the first device; The second device receives a third frame, and the third frame includes a second measurement result. The second measurement result is used to feedback a transmission beam for which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold.

16. The method according to claim 15, wherein The first frame is a beacon frame, and the first indication information is located in the optional sub-element sub-field of the enhanced directional multi-gigabit (EDMG) capability field of the beacon frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and also includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Among them, the value of the CSI measurement request field is a first value, which is used to indicate that the second device measures CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of CSI; the CSI change threshold field is used to indicate the CSI change threshold; the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

17. The method according to claim 15, characterized in that, The first frame is a sector sweep (SSW) frame, and the first indication information is carried in the reserved sub-field of the SSW feedback field of the SSW frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and also includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Among them, the value of the CSI measurement request field is a first value, which is used to indicate that the second device measures CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of CSI, the CSI change threshold field is used to indicate the CSI change threshold, and the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

18. The method according to any one of claims 15-17, characterized in that, The second frame is an SSW frame, and the second indication information is located in the reserved sub-field of the SSW feedback field of this SSW frame; The first measurement result is located in the signal-to-noise ratio (SNR) report sub-field of the SSW feedback field of the SSW frame; Among them, the second indication information includes a CSI difference calculation field, and the CSI difference calculation field is used to indicate whether the first device calculates the CSI difference.

19. The method according to any one of claims 15 - 17, characterized in that, The second frame also includes third indication information, and the third indication information is used to indicate whether the first measurement result is included in the second frame.

20. The method according to any one of claims 15 - 17, characterized in that, The third frame is an SSW feedback frame, and the second measurement result is located in the SNR report sub-field of the SSW feedback field of the SSW feedback frame.

21. The method according to any one of claims 15-17, characterized in that, The third frame further includes fourth indication information, which is used to indicate whether the second measurement result is included in the third frame.

22. The method according to any one of claims 15 - 17, characterized in that, The first measurement result includes a first antenna identifier and a first sector identifier, and the second measurement result includes a second antenna identifier and a second sector identifier; The beam determined by the first antenna identifier and the first sector identifier is a transmission beam among all the transmission beams of the first device, in which the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold; The beam determined by the second antenna identifier and the second sector identifier is a transmission beam among all the transmission beams of the second device, in which the CSI difference between any two CSI measurements on the same transmission beam is greater than the CSI change threshold.

23. The method according to claim 15, characterized in that After the second device receives the third frame, the method further includes: The second device receives the first BRP PPDU multiple times, and the first BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; The second device quasi-omnidirectionally transmits the second BRP PPDU multiple times, and the second BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; The second device receives a third BRP frame, and the third BRP frame is used to feedback the number of first received beams in the beam pairing phase for the beam training of the first device. The number of first received beams is the number of received beams among all the received beams of the first device, in which the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold; The second device transmits a fourth BRP frame, and the fourth BRP frame is used to feedback the number of second received beams in the beam pairing phase for the beam training of the second device. The number of second received beams is the number of received beams among all the received beams of the second device, in which the CSI difference between any two CSI measurements on the same received beam is greater than the CSI change threshold.

24. The method according to claim 23, wherein After the second device transmits the fourth BRP frame, the method further includes: The second device receives the fifth BRP PPDU multiple times, and the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; The second device transmits the sixth BRP PPDU multiple times, and the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; The second device receives a seventh BRP frame carrying a first beam information list, and the first beam information list is used to feedback multiple transmission beams in which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam; The second device transmits an eighth BRP frame carrying a second beam information list, and the second beam information list is used to feedback multiple transmission beams in which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmission beam.

25. The method according to claim 23 or 24, characterized in that, The first BRP PPDU and the second BRP PPDU both include a CSI measurement request field and a beam scan cycle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan cycle number field is used to indicate the number of scan cycles of the receiving beam; The first BRP PPDU and the second BRP PPDU further include one or more of the following fields: A transmitter sensing sector identification field and a transmitter sensing antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

26. The method according to claim 23 or 24, characterized in that, The first receiving beam quantity is carried in the directional multi-gigabit (DMG) beam refinement element of the third BRP frame; The second receiving beam quantity is carried in the DMG beam refinement element of the fourth BRP frame.

27. The method according to claim 24, wherein The fifth BRP PPDU and the sixth BRP PPDU both include a CSI measurement request field and a beam scan cycle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan cycle number field is used to indicate the number of scan cycles of the receiving beam; The fifth BRP PPDU and the sixth BRP PPDU further include one or more of the following fields: A transmitter sensing sector identification field and a transmitter sensing antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

28. The method according to claim 24, wherein The first beam information list is located in the sensing measurement feedback element of the seventh BRP frame; 29. A radio frequency sensing method, characterized in that, The second beam information list is located in the sensing measurement feedback element of the eighth BRP frame. including: The first device sends a plurality of first frames, and each first frame includes first indication information, where the first indication information is used to indicate the second device to evaluate the change amount of the CSI from the first device to the second device; The first device quasi-omnidirectionally receives a plurality of second frames, and each second frame includes second indication information, where the second indication information is used to indicate the first device to evaluate the change amount of the CSI from the second device to the first device; The first device sends a first sensing feedback frame, and the first sensing feedback frame includes a second measurement result, where the second measurement result is used to feedback a plurality of transmission beams whose change amount of the CSI from the second device to the first device is greater than the CSI change threshold; 30. The method according to claim 29, wherein The first device receives a second sensing feedback frame, and the second sensing feedback frame includes a first measurement result, where the first measurement result is used to feedback a plurality of transmission beams whose change amount of the CSI from the first device to the second device is greater than the CSI change threshold. The first frame is a beacon frame, and the first indication information is located in the optional sub-element sub-field of the EDMG capability field of the beacon frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Wherein, the value of the CSI measurement request field is a first value, which is used to instruct the second device to measure CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of CSI; the CSI change threshold field is used to indicate the CSI change threshold; the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

31. The method according to claim 29, wherein, The first frame is an SSW frame, and the first indication information is carried in a reserved sub-field of the SSW feedback field of the SSW frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Wherein, the value of the CSI measurement request field is a first value, which is used to instruct the second device to measure CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of CSI, the CSI change threshold field is used to indicate the CSI change threshold, and the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

32. The method according to any one of claims 29 - 31, characterized in that, The second frame is an SSW frame, and the second indication information is located in a reserved sub-field of the SSW feedback field of the SSW frame; The second indication information includes a CSI difference calculation field, and the CSI difference calculation field is used to indicate whether the first device performs CSI calculation.

33. The method according to any one of claims 29 - 31, characterized in that, The first measurement result includes multiple groups of first beam identifiers, and a group of first beam identifiers includes a first antenna identifier and a first sector identifier; The second measurement result includes multiple groups of second beam identifiers, and a group of second beam identifiers includes a second antenna identifier and a second sector identifier; The beam determined by a group of first beam identifiers is a transmit beam among all the transmit beams of the first device where the CSI difference between any two CSI measurements on the same transmit beam is greater than the CSI change threshold; The beam determined by a group of second beam identifiers is a transmit beam among all the transmit beams of the second device where the CSI difference between any two CSI measurements on the same transmit beam is greater than the CSI change threshold.

34. The method according to claim 29, wherein After the first device receives the second sensing feedback frame, the method further includes: The first device quasi-omnidirectionally transmits a first BRP PPDU multiple times, and the first BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; The first device receives a second BRP PPDU multiple times, and the second BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; The first device sends a third BRP frame, and the third BRP frame is used to feedback the number of first receive beams in the beam training of the first device in the beam pairing phase, and the number of first receive beams is the number of receive beams among all the receive beams of the first device where the CSI difference between any two CSI measurements on the same receive beam is greater than the CSI change threshold; The first device receives a fourth BRP frame, which is used to feedback the number of second receiving beams in the beam training of the second device during the beam pairing phase. The number of second receiving beams is the number of receiving beams among all the receiving beams of the second device where the CSI difference between any two CSI measurements on the same receiving beam is greater than the CSI change threshold.

35. The method according to claim 34, wherein, After the first device receives the fourth BRP frame, the method further includes: The first device sends a fifth BRP PPDU multiple times, and the fifth BRP PPDU is used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; The first device receives a sixth BRP PPDU multiple times, and the sixth BRP PPDU is used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; The first device sends a seventh BRP frame carrying a first beam information list, and the first beam information list is used to feedback multiple transmitting beams whose CSI change amount from the second device to the first device is greater than the CSI change threshold and the receiving antenna corresponding to each transmitting beam; The first device receives an eighth BRP frame carrying a second beam information list, and the second beam information list is used to feedback multiple transmitting beams whose CSI change amount from the first device to the second device is greater than the CSI change threshold and the receiving antenna corresponding to each transmitting beam.

36. The method according to claim 34 or 35, characterized in that, Both the first BRP PPDU and the second BRP PPDU include a CSI measurement request field and a beam scan circle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan circle number field is used to indicate the number of scan circles of the receiving beam; The first BRP PPDU and the second BRP PPDU further include one or more of the following fields: A transmitting end sensing sector identification field and a transmitting end sensing antenna identification mask field, which are used to jointly indicate the transmitting sector and the transmitting antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

37. The method according to claim 34 or 35, characterized in that, The number of first receiving beams is carried in the DMG beam refinement element of the third BRP frame; The number of second receiving beams is carried in the DMG beam refinement element of the fourth BRP frame.

38. The method according to claim 35, wherein Both the fifth BRP PPDU and the sixth BRP PPDU include a CSI measurement request field and a beam scan circle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan circle number field is used to indicate the number of scan circles of the receiving beam; The fifth BRP PPDU and the sixth BRP PPDU further include one or more of the following fields: A transmitting end sensing sector identification field and a transmitting end sensing antenna identification mask field, which are used to jointly indicate the transmitting sector and the transmitting antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

39. The method according to claim 35, wherein The first beam information list is located in the sensing measurement feedback element of the seventh BRP frame; The second beam information list is located in the sensing measurement feedback element of the eighth BRP frame.

40. A radio frequency sensing method, characterized in that, Including: The second device omnidirectionally receives a plurality of first frames, and each first frame includes first indication information for instructing the second device to evaluate the change amount of the CSI from the first device to the second device; The second device sends a plurality of second frames, and each second frame includes second indication information for instructing the first device to evaluate the change amount of the CSI from the second device to the first device; The second device receives a first sensing feedback frame, and the first sensing feedback frame includes a second measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the second device to the first device is greater than the CSI change threshold; The second device sends a second sensing feedback frame, and the second sensing feedback frame includes a first measurement result for feeding back a plurality of transmission beams in which the change amount of the CSI from the first device to the second device is greater than the CSI change threshold.

41. The method according to claim 40, wherein The first frame is a beacon frame, and the first indication information is located in the optional sub-element sub-field of the EDMG capability field of the beacon frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Wherein, the value of the CSI measurement request field is a first value for instructing the second device to measure the CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of the CSI; the CSI change threshold field is used to indicate the CSI change threshold; the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

42. The method according to claim 40, wherein The first frame is an SSW frame, and the first indication information is carried in the reserved sub-field of the SSW feedback field of the SSW frame; The first indication information includes a CSI measurement request field and a CSI difference calculation field, and further includes one or more of the following fields: an evaluation algorithm field, a CSI change threshold field; Wherein, the value of the CSI measurement request field is a first value for instructing the second device to measure the CSI; the evaluation algorithm field is used to indicate the evaluation algorithm of the CSI, the CSI change threshold field is used to indicate the CSI change threshold, and the CSI difference calculation field is used to indicate whether the second device calculates the CSI difference.

43. The method according to any one of claims 40 - 42, characterized in that, The second frame is an SSW frame, and the second indication information is located in the reserved sub-field of the SSW feedback field of the SSW frame; The second indication information includes a CSI difference calculation field for indicating whether the first device performs CSI calculation.

44. The method according to any one of claims 40 - 42, characterized in that, The first measurement result includes multiple groups of first beam identifiers, and a group of first beam identifiers includes a first antenna identifier and a first sector identifier; The second measurement result includes multiple groups of second beam identifiers. One group of second beam identifiers includes a second antenna identifier and a second sector identifier; The beam determined by one group of first beam identifiers is a transmit beam among all the transmit beams of the first device, where the CSI difference between any two CSI measurements on the same transmit beam is greater than the CSI change threshold; The beam determined by one group of second beam identifiers is a transmit beam among all the transmit beams of the second device, where the CSI difference between any two CSI measurements on the same transmit beam is greater than the CSI change threshold.

45. The method according to claim 40, wherein After the second device sends the second sensing feedback frame, the method further includes: The second device receives multiple first BRP PPDUs, which are used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; The second device quasi-omnidirectionally sends multiple second BRP PPDUs, which are used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; The second device receives a third BRP frame, which is used to feedback the number of first receive beams in the beam training of the first device in the beam pairing phase. The number of first receive beams is the number of receive beams among all the receive beams of the first device, where the CSI difference between any two CSI measurements on the same receive beam is greater than the CSI change threshold; The second device sends a fourth BRP frame, which is used to feedback the number of second receive beams in the beam training of the second device in the beam pairing phase. The number of second receive beams is the number of receive beams among all the receive beams of the second device, where the CSI difference between any two CSI measurements on the same receive beam is greater than the CSI change threshold.

46. The method according to claim 45, wherein After the second device sends the fourth BRP frame, the method further includes: The second device receives multiple fifth BRP PPDUs, which are used to instruct the second device to evaluate the change amount of the CSI from the first device to the second device; The second device sends multiple sixth BRP PPDUs, which are used to instruct the first device to evaluate the change amount of the CSI from the second device to the first device; The second device receives a seventh BRP frame carrying a first beam information list, which is used to feedback multiple transmit beams whose CSI change amount from the second device to the first device is greater than the CSI change threshold and the receive antenna corresponding to each transmit beam; The second device sends an eighth BRP frame carrying a second beam information list, which is used to feedback multiple transmit beams whose CSI change amount from the first device to the second device is greater than the CSI change threshold and the receive antenna corresponding to each transmit beam.

47. The method according to claim 45 or 46, characterized in that, Both the first BRP PPDU and the second BRP PPDU include a CSI measurement request field and a beam scan cycle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan cycle number field is used to indicate the number of scan cycles of the receiving beam; The first BRP PPDU and the second BRP PPDU further include one or more of the following fields: A transmitter sensing sector identification field and a transmitter sensing antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

48. The method according to claim 45 or 46, characterized in that, The number of the first receiving beams is carried in the DMG beam refinement element of the third BRP frame; The number of the second receiving beams is carried in the DMG beam refinement element of the fourth BRP frame.

49. The method according to claim 46, wherein Both the fifth BRP PPDU and the sixth BRP PPDU include a CSI measurement request field and a beam scan cycle number field. The value of the CSI measurement request field is a first value, which is used to indicate measuring CSI, and the beam scan cycle number field is used to indicate the number of scan cycles of the receiving beam; The fifth BRP PPDU and the sixth BRP PPDU further include one or more of the following fields: A transmitter sensing sector identification field and a transmitter sensing antenna identification mask field, which are used to jointly indicate the transmission sector and transmission antenna of the BRP frame; A CSI change threshold field, which is used to indicate the CSI change threshold; An evaluation algorithm field, which is used to indicate the evaluation algorithm of CSI.

50. The method according to claim 46, characterized in that, The first beam information list is located in the sensing measurement feedback element of the seventh BRP frame; The second beam information list is located in the sensing measurement feedback element of the eighth BRP frame.

51. A first device, characterized in that, It includes units or modules for executing the method according to any one of claims 1-14, or 29-39.

52. A second device, characterized in that, It includes units or modules for executing the method according to any one of claims 15-28, or 40-50.

53. A computer-readable storage medium, in which program instructions are stored. When the program instructions run on a computer, the computer is caused to execute the method according to any one of claims 1-50.

54. A computer program product containing program instructions. When the program instructions run on a computer, the computer is caused to execute the method according to any one of claims 1-50.

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