WO2023217039A1 - Procédé d'acquisition d'informations d'état de canal, et système et appareil associé - Google Patents

Procédé d'acquisition d'informations d'état de canal, et système et appareil associé Download PDF

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Publication number
WO2023217039A1
WO2023217039A1 PCT/CN2023/092536 CN2023092536W WO2023217039A1 WO 2023217039 A1 WO2023217039 A1 WO 2023217039A1 CN 2023092536 W CN2023092536 W CN 2023092536W WO 2023217039 A1 WO2023217039 A1 WO 2023217039A1
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WIPO (PCT)
Prior art keywords
frame
sensing
request
sent
csi
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PCT/CN2023/092536
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English (en)
Chinese (zh)
Inventor
吴腾飞
肖后飞
丁仁天
王利平
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华为技术有限公司
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Publication of WO2023217039A1 publication Critical patent/WO2023217039A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present application relates to the field of communication technology, and in particular, to a method, system and related devices for obtaining channel state information.
  • Wi-Fi wireless fidelity
  • Wi-Fi technology is everywhere.
  • Whole-house intelligence provides quality and convenience for family life, and has become a popular decoration method among young people nowadays.
  • Whole-house intelligence is a new track and strategic point in the future, and human behavior recognition is also a hot research topic in the field of whole-house intelligence.
  • Whole-house intelligence has put forward new demands for Wi-Fi technology usage scenarios.
  • Wi-Fi is not only used for wireless communication, but also for wireless sensing, sensing human presence, human posture, human behavior, etc., to provide users with more refined services and Better experience.
  • the traditional Wi-Fi sensing method uses the received signal strength indicator (RSSI) for sensing.
  • RSSI only describes the total received power and only represents the total received energy of the channel. It does not characterize environmental effects such as multipath in more detail. There are problems such as coarse detection granularity, vulnerability to multipath or environmental noise, unstable measurement values, and inability to be commercially used on a large scale. Therefore, it is difficult to achieve a major breakthrough in the perception accuracy of Wi-Fi RSSI technology.
  • the most widely studied Wi-Fi sensing method in the industry uses channel state information (CSI) for sensing.
  • CSI represents how wireless signals propagate from the transmitter to the receiver at a specific carrier frequency.
  • CSI contains the amplitude and phase information of each propagation path, has finer granularity, is the essential description of wireless communication, and has greater application potential. It can reflect the multipath effect, environmental attenuation, distortion and other channel characteristics experienced by the received signal. Based on this rich channel characteristic information, the sensing accuracy can be effectively improved, and the multipath problem can also be solved.
  • This application provides a method, system and related devices for obtaining channel state information, which enables the first device to send a sensing enable request to the second device when it needs to obtain CSI, so that the second device can send specified frames, so that the first device can frequently obtain CSI from specified frames sent by the second device, so as to satisfy the need for the first device to obtain CSI in time when implementing the sensing function.
  • this application provides a communication system, including: a first device and a second device; wherein the first device is configured to send a first perception enablement request to the second device, and the first perception enablement request
  • the enable request is used to request the second device to send the specified frame at the first frequency; the second device is used to send the specified frame to the first device at the first frequency after receiving the first sensing enable request.
  • the first device is also configured to obtain the channel state information CSI of the transmission path from the second device to the first device based on the designated frame sent by the second device at the first frequency.
  • the first device can send a sensing enable request to the node device when it needs to obtain CSI, so that the second device can periodically send designated frames, so that the first device can frequently
  • the CSI is obtained from the specified frame sent by the second device, so that the first device can obtain the CSI in time when implementing the sensing function.
  • the first device is specifically configured to: count uplink traffic of communication frames sent by the second device to the first device; when the second device sends uplink traffic of communication frames to the first device, When the traffic is less than the first traffic threshold, the first sensing enablement request is sent to the second device.
  • the first device is further configured to: when the uplink traffic of communication frames sent by the second device to the first device is greater than the first traffic threshold, based on the second device sending a communication frame to the third device.
  • the communication frame sent by a device is used to obtain the CSI of the transmission path from the second device to the first device.
  • the first device when the first device needs to obtain the CSI of the transmission path between the second device and the first device, it can first determine whether the upstream traffic of the second device satisfies the CSI acquisition condition (whether it is greater than the traffic threshold), and when the upstream traffic cannot When the CSI acquisition conditions are met, a sensing enable request is sent to the first device so that the second device can periodically send designated frames, so that the first device can frequently obtain CSI from the designated frames sent by the second device to meet the requirements of the first device.
  • a device obtains CSI in time in order to implement the sensing function.
  • the first device is also configured to obtain a first instruction before counting the uplink traffic of the communication frame sent by the second device to the first device, and the first instruction is used to indicate The first device performs a first sensing function; the first device is specifically configured to respond to the first instruction and count uplink traffic of communication frames sent by the second device to the first device.
  • the first device is further configured to perform the first sensing function based on the CSI of the transmission path from the second device to the first device.
  • the first sensing function includes one or more of the following: human body presence detection, human body posture recognition, human body fall detection, user entry detection, and abnormal entry detection.
  • the first device is specifically configured to: send the first perception to the second device by intervening to control the management frame or control frame or data frame of the MAC layer through the medium of wireless fidelity Wi-Fi. Enable request.
  • sending the sensing enable request through the Wi-Fi MAC frame can facilitate the second device to quickly parse the sensing enable request.
  • the first device is specifically configured to: send the first sensing enablement request to the second device through classic Bluetooth or low-power Bluetooth.
  • the designated frame is a Wi-Fi MAC layer data frame
  • the designated frame includes an acknowledgment policy ACK policy field
  • the value of the ACK policy field is a first value
  • the first value is used to indicate The first device does not return acknowledgment information to the second device after receiving the specified frame.
  • the acknowledgment information is used to characterize the reception of the specified frame by the first device. In this way, the impact of the node device on the normal communication service between the central device and the node device due to the need to reply with confirmation information for sending the specified frame can be reduced.
  • the type of the specified frame is a data frame
  • the subtype of the specified frame is an empty NULL frame or a quality of service QoS NULL frame.
  • the first sensing enablement request includes indication information of the first frequency.
  • the central device can instruct the node device to send designated frames at different frequencies according to different scenarios to meet the requirements for obtaining CSI in different scenarios.
  • the first device may determine the first frequency based on the difference between the traffic threshold and the uplink traffic of the second device.
  • the first frequency may be the difference between the first traffic threshold and the uplink traffic of the second device.
  • the first frequency may be the difference between the first traffic threshold and the uplink traffic of the node device plus a certain redundancy value. In this way, it is possible to ensure that the upstream traffic of the second device meets the traffic threshold, thereby improving the sensing effect of the sensing function.
  • the first device is further configured to send a first sensing disable request to the second device after obtaining the CSI of the transmission path from the second device to the first device.
  • the first sensing disable request is used to request the second device to stop sending the designated frame to the first device; the second device is also used to stop sending the designated frame after receiving the first sensing disable request. frame to the first device.
  • the first device when the first device does not need to obtain CSI, the first device can stop sending the specified frame in time, which saves the power consumption of the second device and does not affect the normal communication service between the second device and the first device.
  • the first device is also configured to obtain a second instruction, the second instruction is used to instruct the first device to perform a second sensing function; the first device is also configured to respond to The second instruction is to count the uplink traffic of communication frames sent by the second device to the first device; when the uplink traffic of communication frames sent by the second device to the first device is less than the second traffic threshold, send data to the second device.
  • Send a second sensing enablement request where the second sensing enablement request is used to request the first device to send the specified frame at a second frequency.
  • the first sensing function is different from the second sensing function
  • the second flow threshold is different from the first flow threshold
  • the first device can set different traffic thresholds for the uplink traffic of the second device according to the type of sensing function to achieve refined differentiation of CSI acquisition frequencies.
  • the first device is also configured to: count uplink traffic of communication frames sent by the third device to the first device; when the third device sends uplink traffic of communication frames to the first device When the flow rate is less than the third traffic threshold, a third sensing enablement request is sent to the third device.
  • the third sensing enablement request is used to request the third device to send the specified frame at the third frequency; receive the third device to send the specified frame at the third frequency.
  • the specified frame sent at the second frequency based on the specified frame sent by the third device at the second frequency, the CSI of the transmission path from the third device to the first device is obtained.
  • the device type of the second device is different from the device type of the third device, and the first traffic threshold is different from the third traffic threshold.
  • the distance between the second device and the first device is smaller than the distance between the third device and the first device, and the first flow threshold is greater than the third flow threshold.
  • the present application provides a method for obtaining channel information, including: a first device sending a first sensing enablement request to the second device, and the first sensing enablement request is used to request the second device to perform the first sensing enablement request.
  • a specified frame is sent at a frequency; the first device receives the specified frame sent by the second device at the first frequency; the first device obtains the specified frame from the second device based on the specified frame sent by the second device at the first frequency.
  • Channel state information CSI of the transmission path to the first device.
  • the first device sends a first sensing enablement request to the second device, which specifically includes: the first device counts uplink traffic of communication frames sent by the second device to the first device; When the uplink traffic of communication frames sent by the second device to the first device is less than the first traffic threshold, the first device sends the first sensing command to the second device. Can request.
  • the method further includes: when the uplink traffic of the communication frame sent by the second device to the first device is less than the first traffic threshold, the first device sends the communication frame to the third device based on the second device.
  • the communication frame sent by one device obtains the CSI of the transmission path from the second device to the first device.
  • the method before the first device counts uplink traffic of communication frames sent by the second device to the first device, the method further includes: the first device obtains the first instruction, and the first The instruction is used to instruct the first device to perform the first sensing function; the first device counts uplink traffic of communication frames sent by the second device to the first device, specifically including: in response to the first instruction, the first device counts The second device sends the uplink traffic of the communication frame to the first device.
  • the method further includes: the first device performing the first sensing function based on the CSI of the transmission path from the second device to the first device.
  • the first sensing function includes one or more of the following: human body presence detection, human body posture recognition, human body fall detection, user entry detection, and abnormal entry detection.
  • the first device sends a first sensing enablement request to the second device, which specifically includes: the first device sends a first sensing enablement request to the second device through a management frame or a control frame or a data frame of the Wi-Fi MAC layer.
  • the second device sends the first sensing enablement request.
  • the first device sends a first perception enablement request to the second device, which specifically includes: the first device sends the first perception to the second device through classic Bluetooth or low-power Bluetooth. Enable request.
  • the designated frame is a Wi-Fi MAC layer data frame
  • the designated frame includes an acknowledgment policy ACK policy field
  • the value of the ACK policy field is a first value
  • the first value is used to indicate The first device does not return acknowledgment information to the second device after receiving the specified frame.
  • the acknowledgment information is used to characterize the reception of the specified frame by the first device.
  • the frame type of the specified frame is a data frame
  • the subtype of the specified frame is an empty NULL frame or a quality of service QoS NULL frame.
  • the first sensing enablement request includes indication information of the first frequency.
  • the method further includes: the first device sends a first sensing disable request to the first device.
  • the first sensing disable request is used to request the second device to stop sending the specified frame.
  • the method further includes: the first device obtaining a second instruction, the second instruction being used to instruct the first device to perform a second sensing function; the first device responding to the second Instructions: The first device counts uplink traffic of communication frames sent by the second device to the first device; when the uplink traffic of communication frames sent by the second device to the first device is less than a second traffic threshold, send data to the second device.
  • the device sends a second sensing enablement request, where the second sensing enablement request is used to request the first device to send the specified frame at a second frequency.
  • the first sensing function is different from the second sensing function
  • the second flow threshold is different from the first flow threshold
  • the method further includes: the first device counts the uplink traffic of the communication frame sent by the third device to the first device; when the third device sends the uplink traffic of the communication frame to the first device, When the traffic is less than the third traffic threshold, the first device sends a third sensing enablement request to the third device, and the third sensing enablement request is used to request the third device to send the specified frame at a third frequency; The first device receives the designated frame sent by the third device at the third frequency; the first device obtains the transmission from the third device to the first device based on the designated frame sent by the third device at the third frequency. Path CSI.
  • the device type of the second device is different from the device type of the third device, and the device type of the third device is different.
  • a flow threshold is different from the third flow threshold.
  • the distance between the second device and the first device is smaller than the distance between the third device and the first device, and the first flow threshold is greater than the third flow threshold.
  • the present application provides an electronic device, wherein the first device includes one or more processors and one or more memories.
  • the one or more memories are coupled to one or more processors, and the one or more memories are used to store computer program codes.
  • the computer program codes include computer instructions.
  • the present application provides a computer storage medium, including computer instructions.
  • the computer instructions When the computer instructions are run on a first device, the first device causes the first device to execute the channel state information in any of the possible implementations of any of the above aspects. method of obtaining.
  • embodiments of the present application provide a computer program product.
  • the computer program product When the computer program product is run on a computer, it causes the computer to execute the method for obtaining channel state information in any of the possible implementations of any of the above aspects.
  • Figure 1 is a schematic architectural diagram of a communication system provided by an embodiment of the present application.
  • Figure 2 is a schematic diagram of a home scene of a communication system provided by an embodiment of the present application.
  • Figure 3 is a schematic diagram of a propagation path of a Wi-Fi signal provided by an embodiment of the present application
  • Figure 4 is a schematic diagram of the physical frame format of a Wi-Fi protocol provided by an embodiment of the present application.
  • Figure 5 is a schematic diagram of a CSI acquisition method provided by an embodiment of the present application.
  • Figure 6 is a schematic diagram of a communication air interface transmission provided by an embodiment of the present application.
  • Figure 7 is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present application.
  • Figure 8 is a schematic flow chart of a method for obtaining channel state information provided by an embodiment of the present application.
  • Figure 9 is a schematic diagram of the frame structure of a MAC layer protocol data unit provided by an embodiment of the present application.
  • Figure 10 is a schematic flowchart of a method for obtaining channel state information provided by another embodiment of the present application.
  • first and second are used for descriptive purposes only and shall not be understood as implying or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, “plurality” The meaning is two or more.
  • Figure 1 shows a schematic architectural diagram of a communication system provided in an embodiment of the present application.
  • the communication system 10 may include a central device and N node devices.
  • the central device and the node device can establish a connection through Wi-Fi.
  • the central device can parse out the CSI between the node device and the central device by obtaining the packets sent by the node device through Wi-Fi.
  • the device types of the node device can include smart phones, smart watches, smart speakers, personal computers, smart TVs, tablets, smart sockets, air purifiers, smart desk lamps, smart air conditioners, smart curtains, smart water heaters, routers, etc.
  • Device types of the center device can include smartphones, smart watches, smart speakers, personal computers, smart TVs, tablets, smart sockets, air purifiers, smart desk lamps, smart air conditioners, smart curtains, smart water heaters, routers, etc.
  • FIG. 2 exemplarily shows a schematic diagram of a home scene of a communication system provided in an embodiment of the present application.
  • a home LAN can include 7 smart devices.
  • router 101, smart TV 102, smart socket 103, tablet computer 104, smart speaker 105, smart desk lamp 106 and air purifier 107 can all establish Wi-Fi connections with the router 101.
  • the router 101, the smart TV 102, and the smart socket 103 can be located in the living room of the family floor plan.
  • the tablet computer 104 can be located in the second bedroom 2 of the family floor plan.
  • the smart speaker 105 can be located in the second bedroom 1 of the family floor plan.
  • the smart desk lamp 106 can be placed in the master bedroom of the family floor plan.
  • the air purifier 107 can be located in the study room of the family floor plan.
  • the router 101 can be used as the central device, and the smart TV 102, smart socket 103, tablet computer 104, smart speaker 105, smart desk lamp 106 and air purifier 107 can be used as node devices.
  • the central device can analyze the CSI on the transmission path from the node device to the central device through the Wi-Fi signal sent by the node device. After the central device obtains the CSI, it can detect the presence of the human body in the space based on the CSI, identify the human body posture, detect the human body falling, detect the user entering the home, detect abnormal entry, etc.
  • the node device can parse the CSI on the transmission path from the central device to the node device through the Wi-Fi signal sent by the central device. After the node device obtains the CSI, it can detect the presence of the human body in the space based on the CSI, identify the human body posture, detect the human body falling, detect the user entering the home, detect abnormal entry, etc. After the node device obtains the CSI with the central device, it can detect the presence of the human body in the space based on the CSI, identify the human body posture, detect the human body falling, detect the user entering the home, detect abnormal entry, etc.
  • Figure 3 exemplarily shows the propagation path of Wi-Fi signals in the embodiment of the present application.
  • the Wi-Fi signal when the sending device sends a Wi-Fi signal to the central device, the Wi-Fi signal will propagate to the central device in different directions. Due to the existence of obstructions in the space where the transmitting device and sensing device are located, such as walls, homes, human bodies, etc., Wi-Fi signals will produce multipath effects, environmental attenuation, signal distortion, etc.
  • the Wi-Fi signal sent by the sending device to the receiving device can have multiple paths.
  • the first path is the Wi-Fi signal sent from the sending device and then reflected by the wall to the receiving device.
  • the second path is the Wi-Fi signal.
  • the Fi signal passes through the line-of-sight path (LOS path) and is directly emitted from the sending device to the receiving device.
  • LOS path line-of-sight path
  • Article 3 is that the Wi-Fi signal is sent from the sending device and then reflected to the receiving device through the human body. Due to the different propagation distances of multiple paths and the different absorption properties of electromagnetic waves by different reflecting objects, the Wi-Fi signals on multiple paths will have different amplitudes and phases when they reach the receiving device. After receiving Wi-Fi signals on multiple paths, the receiving device can analyze the CSI based on the Wi-Fi signals, where the CSI includes amplitude information and phase information of the Wi-Fi signals on multiple paths. This CSI can be used to reflect the channel characteristics such as multipath effects, environmental attenuation, and distortion when the Wi-Fi signal is received by the receiving device.
  • the receiving device can detect the changing scenes of spatial objects in the space where the sending device and the receiving device are located based on the changes in CSI on the transmission path between the sending device and the sending device within a period of time, for example, detecting the presence of the human body and identifying the human body posture. , detect human falls, detect user entry, detect abnormal entry, etc.
  • Figure 4 shows the physical frame format of a Wi-Fi protocol provided in the embodiment of this application.
  • the physical frame can be a high efficiency single-user physical layer protocol data unit (HE SU PPDU) in the 802.11ax protocol.
  • the HE SU PPDU may include a legacy short training field (legacy short training field, L-STF), a legacy part long training field (legacy long training field, L-LTF), a legacy signaling field (legacy signaling field, L-SIG), a legacy signaling field Let the repeated legacy signal field (RL-SIG), the high efficiency signal field A (HE-SIG-A), the high efficiency short training field (HE-STF), the high efficiency long training field (high efficiency long training field, HE-LTF), data (Data) field and packet extension (packetextension, PE) field.
  • L-STF can be used for data synchronization and coarse frequency offset estimation at the receiver.
  • L-LTF can be used for fine frequency offset estimation and preamble channel estimation.
  • L-SIG can be used to carry coding rate and length information.
  • RL-SIG can be used to distinguish whether it is an 802.11ax frame.
  • HE-SIG-A can be used to carry information used to describe the physical layer protocol data unit (physical layer protocol data unit, PPDU).
  • HE-STF can be used to improve automatic gain control estimation in multiple-input multiple-output (MIMO) transmission.
  • HE-LTF can be used for channel estimation and phase tracking, where there can be multiple HE-LTFs.
  • the number of HE-LTFs is related to the number of streams of the transmitter's antenna, and the number is variable.
  • the data field may be used to carry user data information, where the user data information may include a media access control layer protocol data unit (media access control layer protocol data unit, MPDU).
  • the PE field can be used to buy more processing time for the receiver.
  • the receiver After receiving the physical frame, the receiver can identify the CSI between the sender and the receiving device based on the HE-LTF in the physical frame.
  • the physical frame is not limited to the above-mentioned HE SU PPDU, but can also be a high-efficiency muti-user physical layer protocol data unit (HE MU PPDU) in the 802.11ax protocol, a high-efficiency extended range single-user physical layer Protocol data unit (highefficiencyextendedrangephysicallayerprotocoldataunit, HE ER SU PPDU), and high efficiency trigger-based physical layer protocol data unit (highefficiencytrigger-based physical layer protocol data unit, HE TB PPDU).
  • HE MU PPDU high-efficiency muti-user physical layer protocol data unit
  • 802.11ax protocol 802.11ax protocol
  • high-efficiency extended range single-user physical layer Protocol data unit high efficiencyextendedrangephysicallayerprotocoldataunit, HE ER SU PPDU
  • high efficiency trigger-based physical layer protocol data unit high efficiencytrigger-based physical layer protocol data unit
  • HE MU PPDU, HE ER SU PPDU, and HE TB PPDU all include one or more HE-LTF. Therefore, the receiver can identify the CSI between the sender and the receiving device from the HE-LTF in HE MU PPDU, HE ER SU PPDU, and HE TB PPDU.
  • HE SU PPDU is suitable for single-user message transmission
  • HE MU PPDU is suitable for simultaneous transmission of multi-user messages
  • HE TB PPDU is suitable for uplink OFDMA and uplink/downlink MU-MIMO scenarios.
  • the station station, STA
  • receives the trigger frame in the HE TB PPDU format sent by the access point access point, AP
  • it can perform multi-user uplink transmission at the same time based on the resource allocation information carried therein.
  • HE ER SU PPDU can be applied to outdoor long-distance scenarios.
  • Figure 5 exemplarily shows a CSI acquisition method provided in the embodiment of the present application.
  • the method of obtaining CSI may include the following steps:
  • the central device actively sends ping packets to the node devices.
  • the node device After receiving the ping packet sent by the central device, the node device can return ACK to the central device.
  • the network card of the central device After receiving the ACK sent by the node device, the network card of the central device can detect the CSI on the transmission path from the node device to the central device. The network card of the central device can report the CSI to the processor of the central device through the driver. The processor can use CSI to identify the sensing scene and complete corresponding operations based on the identified sensing scene.
  • the central device Because in the process of perceptual scene recognition, the central device needs to obtain CSI frequently to ensure the recognition accuracy of perceptual scene recognition. Therefore, in the above-mentioned CSI acquisition method shown in Figure 5, the central device needs to frequently send ping packets to the node device. After receiving the ping packets frequently, the node device needs to frequently reply ACK to the central device.
  • the node device since the central device needs to frequently send ping packets to the node device, the node device needs to frequently reply ACK to the central device after receiving ping packets frequently.
  • the air interfaces of the central device and node devices will consume a large amount of air interface overhead for ping packets and ACKs, which will occupy the air interface resources for communication services between the central device and node devices, and increase the communication delay of communication messages.
  • the embodiment of the present application provides a method for obtaining channel state information, which can realize that when the first device needs to obtain CSI, it can send the first device through a management frame or a control frame or a data frame in the Wi-Fi communication protocol.
  • a sensing enable request is sent to the second device, allowing the second device to periodically send designated frames to the first device, so that the first device can frequently obtain CSI from the designated frames sent by the second device to meet the requirements of the first device.
  • CSI is obtained in time when sensing functions.
  • the first device may be a central device and the second device may be a node device; or the first device may be a node device and the second device may be a central device.
  • the solution of the present application is exemplified by taking the first device as the central device and the second device as the node device.
  • FIG. 7 shows a schematic diagram of the hardware structure of an electronic device 200 provided in the embodiment of the present application.
  • the electronic device 200 may include: a processor 201 , a memory 202 , a wireless communication module 203 , an antenna 205 , and a power management module 206 . in:
  • the processor 201 may include one or more processing units.
  • the processor 201 may include an application processor (application processor, AP), a modem processor, a graphics processing unit (GPU), and an image signal processor. (image signal processor, ISP), controller, memory, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural-network processing unit (NPU) wait.
  • application processor application processor, AP
  • modem processor graphics processing unit
  • GPU graphics processing unit
  • image signal processor image signal processor
  • ISP image signal processor
  • controller memory
  • video codec digital signal processor
  • DSP digital signal processor
  • NPU neural-network processing unit
  • different processing units can be independent devices or integrated in one or more processors.
  • the controller may be the nerve center and command center of the electronic device 200 .
  • the controller can generate operation control signals based on the instruction operation code and timing signals to complete the control of fetching and executing instructions.
  • the processor 201 may also be provided with a memory for storing instructions and data.
  • the memory in processor 201 is cache memory. This memory may hold instructions or data that have just been used or are recycled by the processor 201 . If the processor 201 needs to use the instruction or data again, it can be called directly from the memory. Repeated access is avoided and the waiting time of the processor 201 is reduced, thus improving the efficiency of the system.
  • processor 201 may include one or more interfaces.
  • Interfaces may include integrated circuit (inter-integrated circuit, I2C) interface, integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, pulse code modulation (pulse code modulation, PCM) interface, universal asynchronous receiver and transmitter (universal asynchronous receiver/transmitter (UART) interface, mobile industry processor interface (MIPI), general-purpose input/output (GPIO) interface, subscriber identity module (SIM) interface, and /or universal serial bus (USB) interface, etc.
  • I2C integrated circuit
  • I2S integrated circuit built-in audio
  • PCM pulse code modulation
  • UART universal asynchronous receiver and transmitter
  • MIPI mobile industry processor interface
  • GPIO general-purpose input/output
  • SIM subscriber identity module
  • USB universal serial bus
  • the interface connection relationships between the modules illustrated in the embodiment of the present invention are only schematic illustrations and do not constitute a structural limitation of the electronic device 200 .
  • the electronic device 200 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.
  • the processor 201 can be used to parse the signal received by the wireless communication module 203 and demodulate the signal.
  • the processor 201 can respond according to the parsing results and perform corresponding operations, such as performing sensing operations.
  • the processor 201 can also be used to generate signals sent externally by the wireless communication module 203, such as Wi-Fi signals.
  • Memory 202 is coupled to processor 201 for storing various software programs and/or sets of instructions.
  • the memory 202 may include high-speed random access memory, and may also include non-volatile memory, such as one or more disk storage devices, flash memory devices or other non-volatile solid-state storage devices.
  • the memory 202 can store operating systems, such as uCOS, VxWorks, RTLinux and other embedded operating systems.
  • the memory 202 may also store a communication program that may be used to communicate with the electronic device 200, or other devices.
  • the wireless communication module 203 may include a WLAN communication module 204.
  • the WLAN communication module 204 may provide a solution for Wi-Fi wireless communication applied on the electronic device 200 .
  • the Wi-Fi protocol used in the WLAN communication module 204 may be IEEE802.11a, 802.11b, 802.11n, 802.11ac, 802.11ax, etc.
  • the wireless communication module 203 may also include other communication modules to provide other wireless communications (for example, Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), Solutions for near field communication technology (near field communication, NFC), infrared technology (infrared, IR)).
  • BT Bluetooth
  • GNSS global navigation satellite system
  • FM frequency modulation
  • NFC near field communication
  • IR infrared
  • the WLAN communication module 204 can be integrated with other communication modules (eg, Bluetooth communication module).
  • the WLAN communication module 204 can monitor signals emitted by other devices (such as the electronic device 200), such as measurement signals, scanning signals, etc., and can send response signals, such as measurement responses, scanning responses, etc., so that other devices can discover the electronic device. 200, and establishes wireless communication connections with other devices through one or more of WLAN, Bluetooth, or other short-range wireless communication technologies for data transmission.
  • one or more of the WLAN communication modules 204 can also transmit signals, such as broadcast detection signals and beacon signals, so that other devices can discover the electronic device 200 and communicate via WLAN or other short-range wireless communication.
  • signals such as broadcast detection signals and beacon signals
  • Technology establishes wireless communication connections with other devices for data transmission.
  • Antenna 205 may be used to transmit and receive electromagnetic wave signals. Antennas of different communication modules can be reused or independent of each other to improve antenna utilization.
  • the power management module 206 may be used to control the supply of power to the electronic device 200 .
  • the power source can be a battery or an external power source.
  • the hardware structure of the electronic device 200 may also include an audio module (not shown in FIG. 7 ) and a speaker (not shown in FIG. 7 ).
  • the audio module is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals.
  • the audio module can also be used to encode and decode audio signals.
  • Speakers, also called “horns,” are used to convert audio electrical signals into sound signals.
  • the hardware structure of the electronic device 200 may also include a microphone (not shown in Figure 7).
  • microphone Also called “microphone” or “microphone”, it is used to convert sound signals into electrical signals. When making a call or sending a voice message, the user can speak through the mouth close to the microphone and input the sound signal into the microphone.
  • the electronic device 200 may be provided with at least one microphone.
  • the hardware structure of the electronic device 200 may also include a display screen (not shown in FIG. 7 ).
  • the display screen is used to display images, videos, etc.
  • the display screen includes a display panel.
  • the display panel can use a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active matrix organic light emitting diode or an active matrix organic light emitting diode (active-matrix organic light emitting diode).
  • LCD liquid crystal display
  • OLED organic light-emitting diode
  • AMOLED organic light-emitting diode
  • FLED flexible light-emitting diode
  • Miniled MicroLed, Micro-oLed, quantum dot light emitting diode (QLED), etc.
  • the terminal may include 1 or N display screens, where N is a positive integer greater than 1.
  • the hardware structure of the electronic device 200 may also include one or more sensors (not shown in FIG. 7 ).
  • the one or more sensors may include one or more of the following pressure sensors, gyroscope sensors, air pressure sensors, magnetic sensors, acceleration sensors, distance sensors, proximity light sensors, fingerprint sensors, temperature sensors, touch sensors, and ambient light. Sensors, bone conduction sensors, etc.
  • the electronic device 200 shown in FIG. 7 is only an implementation manner of the embodiment of the present application. In actual applications, the electronic device 200 may also include more or fewer components, which is not limited here.
  • the following introduces a method for obtaining channel state information provided in the embodiment of the present application.
  • Figure 8 shows a schematic flowchart of a method for obtaining channel state information provided in an embodiment of the present application.
  • the method may include the following steps:
  • the central device sends a sensing enable request to the node device.
  • the central device may send the sensing enable request to the node device after obtaining the first instruction for triggering the sensing function.
  • the first instruction can be used to instruct the first device to perform the sensing function.
  • the first instruction can come from an upper-layer application on the central device, or from a cloud server, or from the node device where the central device establishes Wi-Fi or Other node devices.
  • the sensing function may include one or more of the following: human presence detection, human posture recognition, human fall detection, user entry detection, abnormal entry detection, etc.
  • the central device can send a sensing enablement request to the node device through a control frame, a management frame, or a data frame of the Wi-Fi MAC layer.
  • the central device can also send a sensing enable request to the node device through other types of frames at other MAC layers, which is not limited here.
  • the central device may send a sensing enablement request to the node device through a MAC layer control frame or management frame on the Wi-Fi connection established with the node device.
  • the central device can send a sensing enable request to the node device through a MAC layer control frame, management frame, or data frame broadcast.
  • the frame structure of the MAC layer protocol data unit (MPDU) (also called a MAC frame) can be referred to Figure 9.
  • the MPDU may include a MAC header, a frame body, and a frame check sequence.
  • the frame check sequence can occupy 4 bytes (bytes) of which:
  • the MAC header may include a frame control field, a duration/ID field, an address 1 field, an address 2 field, an address 3 field, a sequence control field, and an address 4 field.
  • Field quality of service (QoS) control field.
  • the frame control field can occupy 2 bytes
  • the duration/ID field can occupy 2 bytes
  • the address 1 (address1) field can occupy 6 bytes
  • the address 2 (address2) field can occupy 0 bytes or 6 bytes
  • the address 3 (address3) field can occupy 0 bytes or 6 bytes
  • the sequence control field can occupy 0byte or 2bytes
  • the QoS control field can occupy 0byte or 2bytes.
  • the duration/ID field can be used for the following three functions: implementing the network allocation vector (NAV) mechanism, indicating frames transmitted in a contention-free period, and indicating association identification in power-saving polling (PS-Poll) frames. (association ID, AID).
  • NAV network allocation vector
  • PS-Poll power-saving polling
  • association ID association ID
  • AID association ID
  • the sequence control field can be used by the receiving end of the MAC frame to manage repeated frames and reassembly fragments.
  • the QoS control field can be used to implement QoS functions, where the QoS control field appears in the data frame.
  • the frame body field can be used to load the upper layer payload (payload).
  • the data length of the frame control field may be 16 bits.
  • the frame control field can include the protocol version (protocol) field (can occupy 2 bits), type (type) field (can occupy 2 bits), subtype (subtype) field (can occupy 4 bits), to distributed system (To distributed system, To DS) Field (can occupy 1 bit), from distributed system (From DS) field (can occupy 1 bit), multi-fragments (More Frag) field (can occupy 1 bit), retransmission (Retry) field (can occupy 1 bit) ), power management (Pwr Mgt) field (can occupy 1 bit), more data (More Data) field (can occupy 1 bit), protected frame (Protected Frame) field (can occupy 1 bit), order (Order) field ( Can occupy 1 bit).
  • the protocol version field may be used to indicate the MAC protocol version of the MAC frame.
  • the To DS field and the From DS field can be used to determine whether the MAC frame is destined for a distributed system (i.e., access point (AP)).
  • AP access point
  • the address 1 field is used to represent the receiving end address and destination address
  • the address 2 field is used to represent the sending end address and source address
  • the address 3 field is used to Indicates the basic service cluster ID (basicserviceset ID, BSSID), and the address 4 field is reserved.
  • the Address 1 field is used to represent the receiving end address and destination address
  • the Address 2 field is used to represent the sending end address and BSSID
  • the Address 3 field is used to represent the source address.
  • address 4 field is reserved.
  • the address 1 field is used to represent the receiving end address and BSSID
  • the address 2 field is used to represent the sending end address and source address
  • the address 3 field is used to represent the destination address.
  • address 4 field is reserved.
  • the address 1 field is used to represent the receiving end address
  • the address 2 field is used to represent the sending end address
  • the address 3 field is used to represent the destination address
  • the address 4 field is used to represent the destination address. represents the source address.
  • the multi-fragmentation field can be used to indicate whether there are subsequent fragmented MAC frames to be transmitted.
  • the retransmission field can be used to indicate whether management frames or data frames are retransmitted to exclude duplicate frames.
  • the power consumption management field may be used to indicate the state that the station (STA) side will enter after sending the current frame sequence (for example, active state or sleep state).
  • the multi-data field can be used to indicate that the AP side has at least one MAC frame to be transmitted to the sleeping STA.
  • the protection frame field can be used to indicate whether the MAC frame has been encrypted.
  • the sequence field can be used to indicate whether frames and frame fragments are transmitted strictly sequentially.
  • Type field which can be used to indicate the frame type of this MAC frame.
  • the data length of this frame type field can be 2 bits. For example, when the value of the type field is "00”, it indicates that the MAC frame is a management frame. When the value of the type field is "01”, it indicates that the MAC frame is a control frame. When the value of the type field is "10”, it indicates that the MAC frame is a data frame.
  • the value "11" of the type field is a reserved value and is used for frame type extension of the MAC frame.
  • the subtype field can be used to indicate the subtype of this MAC frame.
  • the data length of this subtype field can be 4 bits.
  • the subtype of the MAC frame represented by the values of the subtype field and the type field is as shown in Table 1 below:
  • the MAC frame is an association request frame in the management frame.
  • the MAC frame is an association response (associationresponse) frame in the management frame.
  • association response associationresponse
  • the MAC frame is a reassociation request frame in the management frame.
  • the MAC frame is a reassociation response (reassociationresponse) frame in the management frame.
  • the MAC frame When the value of the type field is 00 and the value of the subtype field is 0100, the MAC frame is a probe request frame in the management frame. When the value of the type field is 00 and the value of the subtype field is 0101, the MAC frame is a probe response (proberesponse) frame in the management frame. When the value of the type field is 00 and the value of the subtype field is 0110, the MAC frame is a timing advertising (timing advertising) frame in the management frame. The value of the type field is 00, and the value of the subtype field is 0111, which is a reserved value. When the value of the type field is 00 and the value of the subtype field is 1000, the MAC frame is a beacon frame in the management frame.
  • the MAC frame is an announcement traffic indication message (ATIM) frame in the management frame.
  • ATIM announcement traffic indication message
  • the MAC frame is a disassociation frame in the management frame.
  • the MAC frame is an authentication frame in the management frame.
  • the MAC frame is a deauthentication frame in the management frame.
  • the MAC frame is an action frame in the management frame.
  • the value of the type field is 00, and the value of the subtype field is 1110-1111, which are reserved values.
  • the value of the type field is 01, and the value of the subtype field is 0000-0010, which are reserved values.
  • the MAC frame is a tame acknowledgment mechanism (tameacknowledge, TACK) frame in the control frame.
  • the MAC frame is a beamforming report poll (beamformingreportpoll) frame in the control frame.
  • the MAC frame is a very high throughput null data packet announcement (VHT NDP Announcement) frame in the control frame.
  • the MAC frame When the value of the type field is 01 and the value of the subtype field is 0110, the MAC frame is a control frame extension (controlframeextension) frame in the control frame. When the value of the type field is 01 and the value of the subtype field is 0111, the MAC frame is a control wrapper frame in the control frame. When the value of the type field is 01 and the value of the subtype field is 1000, the MAC frame is a block acknowledgment request (blockackrequest) frame in the control frame. When the value of the type field is 01 and the value of the subtype field is 1001, the MAC frame is a block acknowledgment frame in the control frame.
  • blockackrequest block acknowledgment request
  • the value of the type field is 01 and the value of the subtype field is At 1010, the MAC frame is a powersaving poll (PS-Poll) frame in the control frame.
  • PS-Poll powersaving poll
  • the MAC frame is a request to send (RTS) frame in the control frame.
  • RTS request to send
  • the MAC frame is a clear to send (CTS) frame in the control frame.
  • the MAC frame is an acknowledgment (ACK) frame in the control frame.
  • the MAC frame is a contention free end (CF-End) frame in the control frame.
  • the value of the type field is 01, and the value of the subtype field is 1111, which is a reserved value.
  • the MAC frame is a data (Data) frame in the data frame.
  • the value of the type field is 10, and the value of the subtype field is 0001, which is a reserved value.
  • the value of the type field is 10, and the value of the subtype field is 0010, which is a reserved value.
  • the value of the type field is 10, and the value of the subtype field is 0011, which is a reserved value.
  • the MAC frame is a null (Null) frame in the data frame, where there is no data part (ie, frame body field) in the Null frame.
  • the value of the type field is 10, and the value of the subtype field is 0101, which is a reserved value.
  • the value of the type field is 10, and the value of the subtype field is 0110, which is a reserved value.
  • the value of the type field is 10, and the value of the subtype field is 0111, which is a reserved value.
  • the MAC frame is a quality of service data (QoS Data) frame in the data frame.
  • QoS Data quality of service data
  • the MAC frame is the quality of service data + contention-free acknowledgment (QoS Data + CF-ACK) frame in the data frame.
  • the MAC frame is the quality of service data + contention-free polling (QoS Data + CF-Poll) frame in the data frame.
  • QoS Data + CF-Poll quality of service data + contention-free polling
  • the MAC frame is a QoS Data+CF-ACK+CF-Poll frame in the data frame.
  • the MAC frame is a quality of service null (QoS Null) frame in the data frame, where there is no data part (i.e., frame body) in the QoS Null frame. field).
  • the value of the type field is 10, and the value of the subtype field is 1101, which is a reserved value.
  • the MAC frame is a quality of service contention free poll (QoS CF-Poll) frame in the data frame, where there is no content in the QoS CF-Poll frame.
  • Data part i.e., frame body field).
  • the MAC frame is a quality of service non-contention acknowledgment + non-contention polling (QoS CF-ACK+CF-Poll) frame in the data frame, where the QoS There is no data part (ie, frame body field) in the CF-ACK+CF-Poll frame.
  • QoS CF-ACK+CF-Poll quality of service non-contention acknowledgment + non-contention polling
  • the value of the type field is 11, and the value of the subtype field is 0000-1111, which are reserved values.
  • the QoS control field can include a data identification code (trafficidentifier, TID) field, end of service period (EOSP) field, acknowledgment policy (ACK policy) field, reserved field, transmission opportunity limit (TXOP limit)/queue size (queuesize) )/bufferstate field.
  • TID data identification code
  • EOSP end of service period
  • ACK policy acknowledgment policy
  • reserved field transmission opportunity limit
  • TXOP limit transmission opportunity limit
  • queuesize/bufferstate field occupies 8 bits.
  • the sending device sends the MAC frame After giving it to the receiving device, the receiving device needs to reply ACK to the sending device according to the policy.
  • the value of the ACK policy field is 10
  • the sending device sends the MAC frame to the receiving device, the receiving device does not need to reply ACK to the sending device.
  • the value of the subtype field in the management frame is 0111 and 1111 is a reserved value. Therefore, the value of the frame type field of the management frame of the sensing enablement request may be "00" and the value of the subtype field may be "0111". The value of the frame type field of the management frame of the sensing disable request may be "00", and the value of the subtype field may be "1111".
  • the sensing disabling request can be used to instruct the node device to turn off the sensing function.
  • the value of the frame type field of the control frame of the sensing enablement request may be "01" and the value of the subtype field may be "0001".
  • the value of the frame type field of the control frame of the sensing disable request may be "01", and the value of the subtype field may be "0010".
  • the value of the frame type field of the data frame of the sensing enablement request may be "10" and the value of the subtype field may be "0001".
  • the value of the frame type field of the control frame of the sensing disable request may be "01”, and the value of the subtype field may be "0010".
  • the value "11" of the frame type field in the MAC layer is a reserved value. Therefore, the value of the frame type field of the data frame of the sensing enablement request may be "11" and the value of the subtype field may be "0000". The value of the frame type field of the control frame of the sensing disable request may be "11", and the value of the subtype field may be "0001".
  • the central device may include a Bluetooth communication module, and the node device may also include a Bluetooth communication module.
  • the central device can send a sensing enable request to the node device via classic Bluetooth or Bluetooth low energy (BLE).
  • BLE Bluetooth low energy
  • the central device can also send a sensing enablement request to the node device through other wireless communication methods (for example, sparklink communication) or wired communication methods. .
  • the node device After receiving the sensing enable request, the node device turns on the sensing mode.
  • the node device After turning on the sensing mode, the node device can send the designated frame to the central device at the first frequency.
  • the specified frame may be an empty (NULL) frame in the above Table 1, that is, the value of the type field is "10” and the value of the subtype field is "0100".
  • the specified frame can be the Quality of Service NULL (QoS NULL) frame in Table 1 above, that is, the value of the type field can be "10” and the value of the subtype field can be "1100".
  • QoS NULL Quality of Service NULL
  • the designated frame can be a data frame in which the value of the subtype field in the above Table 1 is a reserved value.
  • the value of the type field can be "10" and the value of the subtype field can be "1101".
  • the value of the ACK policy field in the specified frame can be "10", which is used to indicate that the receiver will not reply with confirmation information (such as ACK or negative acknowledgment identifier (NACK)) after receiving the specified frame. Therefore, after receiving the empty data frame sent by the node device at the first frequency, the central device does not reply with confirmation information to the node device. In this way, the impact of the node device on the normal communication service between the central device and the node device due to the need to reply with confirmation information for sending the specified frame can be reduced.
  • confirmation information such as ACK or negative acknowledgment identifier (NACK)
  • the node device can put the designated frame into the data field in the physical frame in the embodiment shown in 4 above, The physical frame including the specified frame is then sent to the central device.
  • the first frequency may be set on the node device by default. After the node device receives the sensing enable request sent by the central device, the node device may send the designated frame to the central device at the first frequency by default. Wherein, the first frequency is greater than the flow threshold.
  • the central device may carry the indication information of the first frequency to the node device through a sensing enablement request. After receiving the sensing enablement request, the node device may send a designated frame to the central device based on the first frequency in the sensing enablement request.
  • the central device can instruct the node device to send designated frames at different frequencies according to different scenarios to meet the requirements for obtaining CSI in different scenarios.
  • the sensing enablement request and the above specified frame are both data frames in which the subtype field in the Wi-Fi protocol is a reserved value
  • the value of the subtype field in the sensing enablement request is the same as the value of the subtype field in the specified frame. The values are different.
  • the central device may determine the first frequency based on the difference between the traffic threshold and the uplink traffic of the node device.
  • the first frequency may be the difference between the traffic threshold and the upstream traffic of the node device.
  • the first frequency may be the difference between the traffic threshold and the upstream traffic of the node device plus a certain redundancy value. In this way, it is possible to ensure that the upstream traffic of the node device meets the traffic threshold, thereby improving the sensing effect of the sensing function.
  • the central device obtains the CSI based on the received message sent by the node device.
  • the message received by the central device may include a designated frame sent by the node device at the first frequency.
  • the message received by the central device may also include a normal communication service frame sent by the node device.
  • the frame types of normal communication service frames include data frames, ACK frames, etc.
  • the central device can obtain the CSI from the packet sent by the node device and perform sensing functions based on the CSI. For example, detecting the presence of the human body, recognizing human posture, detecting human falls, detecting user entry, detecting abnormal entry, etc.
  • the central device can send a sensing disabling request to the node through the management frame or control frame or data frame of the Wi-Fi MAC layer or Bluetooth communication technology, etc. equipment.
  • the node device can turn off the sensing mode and stop sending specified frames to the central device. In this way, when the central device does not need to obtain CSI, the node device can stop sending specified frames in time, which saves the power consumption of the node device and does not affect the normal communication service between the node device and the central device.
  • the central device when it needs to obtain CSI, it can send a sensing enablement request through a management frame or a control frame or a data frame in the Wi-Fi communication protocol.
  • the node device allows the node device to periodically send designated frames, so that the central device can frequently obtain CSI from the designated frames sent by the node device, so that the central device can obtain CSI in time when realizing the sensing function.
  • Figure 10 shows a schematic flowchart of a method for obtaining channel state information provided in an embodiment of the present application.
  • the method may include the following steps:
  • the node device sends a communication frame to the central device.
  • the communication frames include data frames and ACK frames for normal communication services between the node devices and the central device mentioned in the above embodiments, and so on.
  • the central device counts the upstream traffic of the node device.
  • the central device can count the upstream traffic of the node device.
  • the first instruction may come from an upper-layer application on the central device, from a cloud server, or from the node device or other node devices used by the central device to establish Wi-Fi.
  • the upstream traffic of the node device may refer to the number of communication frames sent by the node device to the central device per unit time. For example, if the node device sends an average of 10 communication frames to the central device every second, the upstream traffic of the node device can be 10 frames/second.
  • the central device determines whether the upstream traffic of the node device is greater than the traffic threshold.
  • the central device sends a sensing enable request to the node device.
  • step S1008 If the uplink traffic of the node device is greater than the traffic threshold, the central device directly executes step S1008.
  • step S802 in the embodiment shown in FIG. 8 , which will not be described again here.
  • the node device After receiving the sensing enable request, the node device can turn on the sensing mode.
  • the node device After turning on the sensing function mode, the node device can send the designated frame to the central device at the first frequency.
  • the central device when the central device obtains CSI to implement the sensing function, it needs to meet the CSI acquisition frequency required for the sensing function, and the central device reports CSI once based on a received MAC frame. Therefore, the central device needs the upstream traffic of the node device (that is, the frame traffic sent by the node device to the central device) to meet the traffic threshold in order to better meet the CSI reporting frequency to achieve the sensing function.
  • the traffic threshold can represent the frame traffic required by the central device to obtain CSI to implement the sensing function.
  • the central device needs to send a sensing enable request to the node device, instructing the node device to turn on the sensing mode and send the designated frame to the central device at the first frequency to meet the CSI acquisition frequency of the central device.
  • the uplink traffic of the node device is greater than the traffic threshold, it means that the frame traffic currently sent by the node device to the central device can meet the frame traffic required by the central device to obtain CSI. Therefore, the central device can directly obtain the CSI based on the communication frame sent by the node device to implement the sensing function.
  • the central device can set different above-mentioned traffic thresholds according to the type of sensing function to achieve refined differentiation of CSI acquisition frequencies. For example, after the central device receives the first instruction for triggering the first sensing function (for example, sensing whether a human body is present in the space), the central device may set the traffic threshold of the first node device to the first traffic threshold, and in the first When the uplink traffic of a node device is less than the first traffic threshold, the first node device is triggered to send a designated frame at a first frequency through a first sensing enable request.
  • the first instruction for triggering the first sensing function for example, sensing whether a human body is present in the space
  • the central device may set the traffic threshold of the first node device to the first traffic threshold, and in the first When the uplink traffic of a node device is less than the first traffic threshold, the first node device is triggered to send a designated frame at a first frequency through a first sensing enable request.
  • the central device may set the flow threshold of the first node device to the second flow threshold, and perform the processing on the first node device.
  • the first node device is triggered to send the specified frame at the second frequency through the second sensing enable request.
  • the first sensing function is different from the second sensing function
  • the first flow threshold is different from the second flow threshold.
  • the central device when implementing the same sensing function, the larger the space where the central device and the node device are located, the more channel states will be recorded in the CSI of the transmission path between the central device and the node device. Therefore, The central device will be more accurate every time it obtains the CSI of the transmission path between the node device and the central device. If the central device obtains CSI less frequently, it can also meet the sensing accuracy requirements of the sensing function. Therefore, the central device can set different traffic thresholds for the node device according to the difference in the space where the central device and the node device are located. Among them, when the area where the central device and the node device are in the same space is larger, the traffic threshold can be set smaller. In this way, the sensing function can be realized while reducing the impact on normal communication services between the central device and the node device.
  • the central device and the first node device are located at opposite ends of the living room.
  • the central device and the second node device are both located next to the TV cabinet in the living room.
  • the central device and the first node device are located in a smaller space than the central device and the second node device.
  • the devices are located in the same space, or the distance between the central device and the first node device is smaller than the distance between the central device and the second node device.
  • the first node device When the uplink traffic is less than the second traffic threshold, the first node device is triggered through the first sensing enable request to send the specified frame at the first frequency.
  • the traffic threshold corresponding to the second node device can be set to the third traffic threshold, and the traffic threshold corresponding to the second node device can be set to the third traffic threshold.
  • the first node device When the uplink traffic is less than the second traffic threshold, the first node device is triggered to send the specified frame at the third frequency through the third sensing enable request. Wherein, the first flow threshold is greater than the third flow threshold.
  • different traffic thresholds may be set for the first node device and the second node device.
  • the traffic threshold for the first node device may be set as the first traffic threshold
  • the traffic threshold for the second node device may be set as the third traffic threshold, where the first traffic threshold is different from the third traffic threshold.
  • the central device may be called a first device
  • the first node device may be called a second device
  • the second node device may be called a third device.
  • the specified frame may be an empty (NULL) frame in the above Table 1, that is, the value of the frame type field is "10" and the value of the subtype field is "0100".
  • the specified frame can be the Quality of Service NULL (QoS NULL) frame in Table 1 above, that is, the value of the frame type field can be "10” and the value of the subtype field can be "1100".
  • the designated frame can be a data frame in which the value of the subtype field in the above Table 1 is a reserved value.
  • the value of the frame type field may be "10" and the value of the subtype field may be "1101".
  • the value of the ACK policy field in the specified frame can be "10", which indicates that the receiver will not reply with confirmation information (such as ACK or NACK) after receiving the specified frame. Therefore, after receiving the designated frame sent by the node device at the first frequency, the central device does not reply with confirmation information to the node device. In this way, the impact of the node device on the normal communication service between the central device and the node device due to the need to reply with confirmation information for sending the specified frame can be reduced.
  • the node device can put the designated frame into the data field in the physical frame in the embodiment shown in FIG. 4, and then send the physical frame including the designated frame to the central device.
  • the central device obtains CSI based on the received message.
  • the message received by the central device may include a designated frame sent by the node device at the first frequency.
  • the messages received by the central device may also include normal communication service frames sent by the node device.
  • the frame types of normal communication service frames include data frames, ACK frames, and so on.
  • the central device can obtain the CSI from the message sent by the node device and perform the sensing function on the CSI. For example, detecting the presence of the human body, recognizing human posture, detecting human falls, detecting user entry, detecting abnormal entry, etc.
  • the central device can send a sensing disable request to the node device through a management frame or a control frame.
  • the node device can turn off the sensing mode and stop sending specified frames to the central device. In this way, when the center does not need to obtain CSI, the node device can stop sending specified frames in time, which saves the power consumption of the node device and does not affect the normal communication service between the node device and the center device.
  • the central device when the central device needs to obtain the CSI of the transmission path between the node device and the central device, it can first determine whether the uplink traffic of the node device meets the CSI acquisition conditions ( is greater than the traffic threshold), and when the upstream traffic cannot meet the CSI acquisition conditions, a sensing enable request is sent to the node device, so that the node device can periodically send specified frames, so that the central device can frequently receive specified frames from the node device.
  • the CSI is obtained to satisfy the requirement that the central device obtains the CSI in time to implement the sensing function.
  • the node device may support obtaining CSI to complete the sensing function. Therefore, after the node device obtains the instruction to trigger the sensing function, the node device can count the uplink traffic of the node device. When the uplink traffic of the node device is not greater than the traffic threshold, the node device can send a sensing enable request to the central device. After receiving the sensing enable request, the central device can send a designated frame to the node device at the first frequency. The node device can obtain the CSI based on the received packets and complete the sensing function.
  • the traffic threshold, sensing enablement request, first frequency, and designated frame please refer to the above embodiments and will not be described again here.
  • the central device sends a sensing enable request to the node device via Bluetooth, triggering the node device to send a designated frame to the central device at the first frequency via Bluetooth.
  • the central device can parse out the CSI of the transmission path from the node device to the central device based on the specified frame sent by the node device via Bluetooth at the first frequency, and then complete the sensing function based on the CSI of the transmission path from the node device to the central device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé d'acquisition d'informations d'état de canal (CSI), ainsi qu'un système et un appareil associé. Lorsqu'un premier dispositif doit acquérir des CSI, le premier dispositif peut envoyer une demande d'activation de détection à un second dispositif, de sorte que le second dispositif peut envoyer une trame spécifiée à une certaine fréquence, de telle sorte que le premier dispositif peut acquérir de manière fréquente des CSI à partir de la trame spécifiée envoyée par le second dispositif. De cette manière, le premier dispositif acquiert les CSI d'une manière opportune lorsqu'une fonction de détection est réalisée.
PCT/CN2023/092536 2022-05-09 2023-05-06 Procédé d'acquisition d'informations d'état de canal, et système et appareil associé WO2023217039A1 (fr)

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CN202210498156.1A CN117082563A (zh) 2022-05-09 2022-05-09 一种信道状态信息的获取方法、系统及相关装置

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112350809A (zh) * 2019-08-06 2021-02-09 华为技术有限公司 感知方法和通信装置
CN112398601A (zh) * 2019-08-12 2021-02-23 华为技术有限公司 一种确定通信传输中感知信息的方法及相关设备
WO2021246691A1 (fr) * 2020-06-02 2021-12-09 엘지전자 주식회사 Procédé et appareil permettant d'effectuer une détection dans un système lan sans fil
WO2021251540A1 (fr) * 2020-06-11 2021-12-16 엘지전자 주식회사 Procédé et appareil de génération d'une ppdu pour exécuter une détection wi-fi dans un système de réseau local sans fil
CN114079528A (zh) * 2020-08-12 2022-02-22 华为技术有限公司 一种感知方法及其装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112350809A (zh) * 2019-08-06 2021-02-09 华为技术有限公司 感知方法和通信装置
CN112398601A (zh) * 2019-08-12 2021-02-23 华为技术有限公司 一种确定通信传输中感知信息的方法及相关设备
WO2021246691A1 (fr) * 2020-06-02 2021-12-09 엘지전자 주식회사 Procédé et appareil permettant d'effectuer une détection dans un système lan sans fil
WO2021251540A1 (fr) * 2020-06-11 2021-12-16 엘지전자 주식회사 Procédé et appareil de génération d'une ppdu pour exécuter une détection wi-fi dans un système de réseau local sans fil
CN114079528A (zh) * 2020-08-12 2022-02-22 华为技术有限公司 一种感知方法及其装置

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