Wireless sensing system, wireless sensing method, and measurement device

Abstract

The present invention achieves both highly accurate wireless sensing and highly efficient information communication by utilizing a multi-link device. This wireless sensing system comprises: a measurement requesting device 10 which includes, in a housing, a plurality of AP1 to AP3 corresponding to different frequency bands f1 to f3; and a measurement apparatus 20 which includes, in the housing, a plurality of STA1 to STA3 corresponding to the different frequency bands f1 to f3. The measurement requesting device 10 transmits a measurement requesting signal 30. The measurement device 20 enters a synchronization mode responsive to the measurement requesting signal 30. The measurement requesting device 10 transmits, after the measurement requesting signal 30, a measurement signal 34 of which a characteristic is shared with the measurement device 20, in the plurality of frequency bands f1 to f3. The measurement device 20, responsive to the measurement signal 34, detects propagation channel state information for each of the frequency bands, and transmits a notification signal 36 including the information. The measurement requesting device 10 calculates a wireless sensing result on the basis of the propagation channel state information included in the notification signal 36. The measurement device 20 returns to an asynchronous mode after transmitting the notification signal 36.

Description

[Technical Field]

[0001] The present disclosure relates to a wireless sensing system, a wireless sensing method, and a wireless sensing device, and more particularly to a wireless sensing system, a wireless sensing method, and a wireless sensing device suitable for use in a multi-link device. [Background technology]

[0002] Non-Patent Document 1 below discloses a wireless sensing technology that uses propagation channel state information (CSI). In this technology, a measurement signal is transmitted wirelessly from a measurement requesting device such as an access point (AP) to a measuring device such as a station (STA). The measurement signal reflects the state of the propagation path on the way to the measuring device. The measuring device extracts propagation channel state information from the received measurement signal and returns a communication signal including that information to the measurement requesting device.

[0003] The measurement requesting device senses the propagation path based on the propagation channel state information included in the communication signal. This technology makes it possible to sense, for example, the positions of objects or people present on the propagation path between the measurement requesting device and the measuring device, or the open / close state of a door.

[0004] Non-Patent Document 2 below discloses the standard for wireless LANs defined by IEEE 802.11be. In the 802.11be standard, APs and STAs are provided with a Multi-Link Device (MLD) function. A device with MLD functionality has multiple wireless functions corresponding to different frequency bands within a single housing. Each wireless function for each frequency band can establish its own transmission path to establish high-speed, highly reliable communications. Multi-link transmission also has a synchronous mode in which multiple frequency bands are synchronized for transmission and reception, and an asynchronous mode in which each frequency band is independently used for transmission and reception. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Yang, Zheng, Zimu Zhou, and Yunhao Liu. "From RSSI to CSI: Indoor Localization via Channel Response." ACM Computing Surveys (CSUR) Vol. 46.2, Article 25, November 2013 [Non-patent document 2] E. Khorov, I. Levitsky and IF Akyildiz, "Current Status and Directions of IEEE 802.11be, the Future Wi-Fi 7," in IEEE Access, vol. 8, pp. 88664-88688, May 8, 2020 Summary of the Invention [Problem to be solved by the invention]

[0006] Under the IEEE 802.11be standard, it is conceivable to implement the wireless sensing described in Non-Patent Document 1 using the multi-link device described in Non-Patent Document 2. Wireless sensing, which detects the flow of people, the opening and closing of doors, etc., is not necessarily performed continuously. Therefore, during periods when wireless sensing is not being performed, it is possible to perform normal communication between the measurement request device and the measurement device. However, until now, methods for efficiently implementing both wireless sensing and normal wireless communication have not been fully explored.

[0007] The present disclosure has been made in consideration of the above-mentioned problems, and has as its first object to provide a wireless sensing system that can achieve both highly accurate wireless sensing and highly efficient information communication using a multi-link device.

[0008] A second object of the present disclosure is to provide a wireless sensing method that uses a multi-link device to achieve both highly accurate wireless sensing and highly efficient information communication.

[0009] A third object of the present disclosure is to provide a measurement device that uses a multi-link device to achieve both highly accurate wireless sensing and highly efficient information communication. [Means for solving the problem]

[0010] In order to achieve the above object, a first aspect is a wireless sensing system including a measurement requesting device having multiple wireless functions corresponding to different frequency bands in a single housing, and a measuring device having multiple wireless functions corresponding to different frequency bands in a single housing, a measurement request signal transmission process in which the measurement request device transmits a measurement request signal to the measurement device; a synchronization process in which the measurement device receives the measurement request signal and changes the transmission mode to a synchronization mode; a measurement signal transmission process in which the measurement requesting device transmits, after transmitting the measurement request signal, a measurement signal whose characteristics are shared with the measurement device, to the measurement device in a plurality of frequency bands; a CSI detection process in which the measurement device receives the measurement signal and detects propagation channel state information representing the state of a propagation channel for each frequency band; a result calculation process for calculating a result of wireless sensing of a space between the measurement requesting device and the measuring device based on the propagation channel state information detected for a plurality of frequency bands; an asynchronous process in which the measurement device changes the transmission mode to an asynchronous mode when the measurement device completes a process required for executing the wireless sensing; It is preferable that the system is configured to execute the following.

[0011] A second aspect is a wireless sensing method using a measurement requesting device having a plurality of wireless functions corresponding to different frequency bands in one housing, and a measuring device having a plurality of wireless functions corresponding to different frequency bands in one housing, the measurement request device transmitting a measurement request signal to the measurement device; the measurement device receiving the measurement request signal and changing the transmission mode to a synchronous mode; the measurement requesting device transmits, after transmitting the measurement request signal, a measurement signal having characteristics shared with the measurement device, to the measurement device in a plurality of frequency bands; the measurement device receives the measurement signal and detects propagation channel state information representing a state of a propagation channel for each frequency band; calculating a result of wireless sensing of a space between the measurement requesting device and the measuring device based on the propagation channel state information detected for a plurality of frequency bands; changing the transmission mode to an asynchronous mode when the measurement device completes processing necessary for executing the wireless sensing; It is desirable to include:

[0012] A third aspect is a measurement device that realizes a wireless sensing function based on the results of information communication with a measurement requesting device that has multiple wireless functions corresponding to different frequency bands in one housing, It has multiple wireless functions corresponding to different frequency bands in one housing, A process of receiving a measurement request signal emitted from the measurement request device; a process of receiving the measurement request signal and setting the transmission mode to a synchronous mode; receiving, after receiving the measurement request signal, measurement signals emitted from the measurement requesting device in a plurality of frequency bands, the measurement signals having characteristics shared with the measurement device; receiving the measurement signal and detecting propagation channel state information representing the state of the propagation channel for each frequency band; transmitting a communication signal including the propagation channel state information detected for a plurality of frequency bands to the measurement requesting device in the plurality of frequency bands; Preferably, the system is configured to execute the following: [Effects of the Invention]

[0013] According to the first to third aspects, it is possible to achieve both highly accurate wireless sensing and highly efficient information communication using a multi-link device. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram illustrating a configuration of a wireless sensing system according to a first embodiment of the present disclosure. [Figure 2] 2 is a block diagram for explaining the configuration of a measurement requesting device included in the wireless sensing system shown in FIG. 1. FIG. [Figure 3] 2 is a block diagram for explaining the configuration of a measurement device included in the wireless sensing system shown in FIG. 1. FIG. [Figure 4] 3 is a flowchart illustrating the flow of processing executed in the measurement request device shown in FIG. 2. [Figure 5] 3 is a flowchart illustrating the flow of processing executed in the measurement device shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0015] Embodiment 1 [Configuration of the First Embodiment] Fig. 1 is a diagram illustrating the configuration of a wireless sensing system according to a first embodiment of the present disclosure. As shown in Fig. 1, the wireless sensing system according to this embodiment includes a measurement request device 10 and a measurement device 20. Both the measurement request device 10 and the measurement device 20 have a multi-link device (MLD) function that complies with the IEEE 802.11be standard.

[0016] The measurement request device 10 is equipped with a plurality of access points (APs). In this embodiment, the measurement request device 10 is equipped with AP1, AP2, and AP3. AP1 to AP3 each support a different frequency band. Here, it is assumed that AP1, AP2, and AP3 support frequency bands f1, f2, and f3, respectively. The measurement request device 10 also has antennas 12, 14, and 16 corresponding to AP1, AP2, and AP3, respectively.

[0017] Similarly, the measurement device 20 includes a plurality of terminal devices (STAs). In this embodiment, the measurement device 20 includes STA1, STA2, and STA3. STA1 to STA3 correspond to different frequency bands, specifically, f1, f2, and f3, respectively. The measurement device 20 also includes antennas 22, 24, and 26 corresponding to STA1, STA2, and STA3, respectively.

[0018] AP1 to AP3 included in the measurement request device 10 can send and receive wireless signals to and from STA1 to STA3 included in the measurement device 20. The measurement request device 10 and the measurement device 20 can then perform wireless sensing of the space between them. Wireless sensing makes it possible to detect the position and activity of objects present in the sensing target space.

[0019] When starting wireless sensing, the measurement request device 10 transmits a measurement request signal 30 to the measurement device 20. The measurement request device 10 issues a command to all of AP1 to AP3 to transmit the measurement request signal 30. If all of AP1 to AP3 are in a state where they can transmit signals, the measurement request signal 30 is transmitted in all of the frequency bands f1, f2, and f3. On the other hand, if any of the APs is in a state where transmission is not possible, the measurement request signal 30 is transmitted in a frequency band excluding the frequency band covered by that AP.

[0020] The measurement device 20 recognizes all frequency bands in which it has received the measurement request signal 30 as sensing frequency bands available for wireless sensing. The measurement device 20 then begins preparations for wireless sensing and returns a measurement preparation completion signal 32 when the preparations are complete. The measurement preparation completion signal 32 is transmitted in all frequency bands for which preparation is complete. For example, when preparations for wireless sensing are complete in all of the frequency bands f1, f2, and f3, the measurement preparation completion signal 32 is returned in all of those frequency bands.

[0021] When the measurement requesting device 10 receives the measurement preparation completion signal 32, it recognizes the frequency band in which the signal was received as a sensing frequency band available for wireless sensing, and then transmits a measurement signal 34 in the entire sensing frequency band.

[0022] The measurement signal 34 reflects the state of the propagation path between the measurement requesting device 10 and the measuring device 20. For example, if there is a person or object in the propagation path, the effect of that person or object will be reflected in the measurement signal 34. Furthermore, if there is a door in the propagation path, the open / closed state of the door will be reflected in the measurement signal 34.

[0023] The characteristics of the measurement signal 34 are shared in advance between the measurement requesting device 10 and the measurement device 20. Therefore, by calculating the difference between the received measurement signal 34 and the previously shared characteristics, the measurement device 20 can detect, for each frequency band, changes due to the state of the propagation path as propagation channel state information (CSI). The measurement device 20 transmits, in all available frequency bands, a notification signal 36 including the CSI detected in this way.

[0024] Upon receiving the notification signal 36, the measurement requesting device 10 estimates the state of the propagation path based on the CSI contained therein. In this way, the wireless sensing system of this embodiment detects the state of the target space.

[0025] [Features of the first embodiment] As described above, the measurement requesting device 10 and the measurement device 20 used in this embodiment have multiple wireless functions of different frequency bands within a single housing. The measurement requesting device 10 and the measurement device 20 have the function of switching between a synchronous mode in which multiple frequency bands transmit and receive synchronously, and an asynchronous mode in which each frequency band transmits and receives independently.

[0026] The accuracy of wireless sensing can be improved by integrating results obtained in multiple frequency bands. Furthermore, when collecting sensing results in multiple frequency bands, the time required for sensing can be minimized by simultaneously performing sensing in all frequency bands. Furthermore, simultaneously performing sensing in multiple frequency bands can prevent variations in the propagation path conditions in each frequency band. Therefore, simultaneously performing sensing in multiple frequency bands is effective in improving the accuracy of wireless sensing. In other words, in order to perform wireless sensing efficiently and with high accuracy, it is effective to operate the measurement requesting device 10 and the measuring device 20 in synchronous mode.

[0027] However, wireless sensing is generally not performed continuously. Therefore, during periods when wireless sensing is not being performed, normal wireless communication for the purpose of information transmission can be performed between the measurement requesting device 10 and the measurement device 20. When normal information transmission is performed using multiple frequency bands, information transmission can be achieved more efficiently when each frequency band can freely transmit and receive information without being restricted by other frequency bands than when synchronization is required. For this reason, when normal wireless communication is performed, it is effective to operate the measurement requesting device 10 and the measurement device 20 in asynchronous mode.

[0028] In this way, it is desirable that the measurement requesting device 10 and the measuring device 20 operate in synchronous mode during wireless sensing, and operate in asynchronous mode when performing normal wireless communication. The wireless sensing system of this embodiment is characterized by the fact that by appropriately switching between these modes, it is possible to achieve both the function of achieving highly accurate wireless sensing in a short time and the function of transmitting information with high efficiency.

[0029] [Details of the first embodiment] Hereinafter, with reference to FIGS. 2 and 3, the hardware configurations that the measurement requesting device 10 and the measurement device 20 each have for realizing the above functions will be described in detail.

[0030] Fig. 2 is a block diagram for explaining in detail the configuration of the measurement requesting device 10 in this embodiment. As shown in Fig. 2, the measurement requesting device 10 includes a control unit 40. The control unit 40 can be realized by a dedicated hardware circuit. Alternatively, the control unit 40 may include a processor and a memory, and realize desired functions by causing the processor to execute a program stored in the memory.

[0031] The control unit 40 includes a measurement request signal generation unit 42. When a request to perform wireless sensing occurs, the measurement request signal generation unit 42 generates a measurement request signal 30 and provides the signal to the transmission units 44-1 to 44-3. The transmission units 44-1 to 44-3 are provided in the AP1 to AP3 and correspond to the frequency bands f1 to f3, and when in a state where they can transmit the measurement request signal 30, they send out the measurement request signal 30 in the frequency band allocated to them.

[0032] The measurement requesting device 10 also includes receiving units 46-1 to 46-3. The receiving units 46-1 to 46-3 are provided in AP1 to AP3, respectively, and correspond to the frequency bands f1 to f3. The receiving units 46-1 to 46-3 receive various signals sent from the measurement device 20 and provide them to the control unit 40. For example, when the measurement device 20 sends a measurement preparation complete signal 32 in the frequency band f1, the signal is provided to the control unit 40 via the receiving unit 46-1. When the measurement preparation complete signal 32 is sent in the frequency band f2 or f3, the signal is provided to the control unit 40 via the receiving unit 46-2 or 46-3.

[0033] The control unit 40 includes a measurement signal generation unit 48. The measurement signal generation unit 48 determines for which of the frequency bands f1 to f3 measurement preparation is complete, depending on which of the receiving units 46-1 to 46-3 has provided the measurement preparation completion signal 32. The measurement signal generation unit 48 then generates a measurement signal 34 for performing wireless sensing and provides the measurement signal 34 to one of the transmitting units 44-1 to 44-3 that corresponds to the frequency band for which measurement preparation is complete. As a result, the measurement requesting device 10 transmits the measurement signal 34 to the measurement device 20 in the frequency band for which measurement preparation is complete.

[0034] Thereafter, notification signals 36 returned from the measurement devices 20 are provided to the control unit 40 via the receiving units 46-1 to 46-3. Then, the control unit 40 extracts the CSI included in the notification signals 36 for each frequency, and performs position estimation or activity detection for the propagation path based on the results.

[0035] Fig. 3 is a block diagram for explaining in detail the configuration of measurement device 20 in this embodiment. As shown in Fig. 3, measurement device 20 includes multiple receiving units 50-1 to 50-3. Receiving units 50-1 to 50-3 are included in STA1 to STA3 and correspond to frequency bands f1 to f3. Receiving units 50-1 to 50-3 receive signals transmitted from measurement request device 10 in the frequency bands assigned to them, respectively.

[0036] For example, when the measurement request device 10 transmits the measurement request signal 30 in all frequency bands f1 to f3, the signals are provided to the transmission mode switching unit 52 via the receiving units 50-1 to 50-3. The transmission mode switching unit 52 can be realized by a dedicated hardware circuit. Alternatively, the transmission mode switching unit 52 may include a processor and a memory, and realize a desired function by causing the processor to execute a program stored in the memory.

[0037] When the transmission mode switching unit 52 receives the measurement request signal 30, it issues a command to switch the measurement device 20 to the synchronous mode. This command is provided to all of STA1 to STA3. As a result, the STAs that can adopt the synchronous mode will maintain the synchronous mode if they are already in the synchronous mode, and will switch to the synchronous mode if they are currently in the asynchronous mode.

[0038] The transmission mode switching unit 52 can also access the mode change storage unit 54. The mode change storage unit 54 stores information about whether the measurement device 20 is set to synchronous mode or asynchronous mode. When the transmission mode switching unit 52 switches the measurement device 20 from asynchronous mode to synchronous mode, it writes a record of "switching required" in the mode change storage unit 54. On the other hand, when returning from synchronous mode to asynchronous mode, it cancels the "switching required" in the mode change storage unit 54.

[0039] Upon receiving measurement request signal 30, transmission mode switching unit 52 issues a command to switch measuring device 20 to the synchronous mode, and then notifies measurement preparation completion signal generating unit 56 of this state. Upon receiving this notification, measurement preparation completion signal generating unit 56 generates measurement preparation completion signal 32 and provides this signal to transmitting units 58-1 to 58-3.

[0040] Transmitters 58-1 to 58-3 are provided in STA1 to STA3 and correspond to frequency bands f1 to f3. When corresponding STA1 to STA3 can adopt the synchronization mode, transmitters 58-1 to 58-3 transmit measurement preparation completion signals 32 in the frequency bands assigned to them. As a result, measurement device 20 transmits measurement preparation completion signals 32 to measurement requesting device 10 in the frequency bands in which synchronization is ready.

[0041] When receiving a measurement signal 34 for wireless sensing from the measurement request device 10, the receiving units 50-1 to 50-3 of the measurement device 20 provide the received signal to a propagation channel measuring unit 60. The signal provided to the propagation channel measuring unit 60 reflects the state of the propagation path. The propagation channel measuring unit 60 then detects CSI for each of the frequencies f1 to f3 based on the difference between a known feature of the measurement signal 34 and a feature superimposed on the received signal. The CSI detected in this manner is provided to a notification signal generating unit 62.

[0042] The notification signal generator 62 provides the CSI generated for each frequency by the propagation channel measurer 60 to the transmitters 58-1 to 58-3 that cover the sensing frequency band. The transmitters 58-1 to 58-3 then transmit notification signals 36 including the CSI to the measurement request device 10 in the frequency bands assigned to them.

[0043] [Processing flow in the first embodiment] Fig. 4 is a flowchart for explaining the flow of characteristic processes executed by the measurement request device 10. The routine shown in Fig. 4 is started every time a request to perform wireless sensing is generated. When this routine is started, first, a measurement request signal 30 is transmitted over all frequency bands (step 100).

[0044] Next, it is determined whether or not a measurement preparation completion signal 32 has been received from the measurement device 20 (step 102). This process is repeated until reception of the signal is confirmed.

[0045] Then, when reception of the measurement preparation completion signal 32 is confirmed, the measurement signal 34 is transmitted in the frequency band in which the signal was received (step 104).

[0046] After completing the above process, the measurement requesting device 10 determines whether or not it has received the notification signal 36 from the measuring device 20 (step 106). If it has not received the notification signal 36 after waiting for a certain period of time (step 108), it performs the process from step 100 onwards again to restart wireless sensing from the beginning.

[0047] On the other hand, if the notification signal 36 is received before the specified time has elapsed, the processing of this routine is terminated. After that, the notification signal 36 is analyzed for each frequency band, and the CSI contained therein is extracted. Then, location detection or motion detection is performed based on all the obtained CSI.

[0048] 5 is a flowchart illustrating the flow of characteristic processing executed by the measurement device 20 in this embodiment. The routine shown in FIG. 5 is periodically started according to a preset rule. When this routine is started, it is first determined whether or not a measurement request signal 30 has been received from the measurement request device 10 (step 110).

[0049] If reception of the measurement request signal 30 is confirmed, the received frequency band is recognized as the sensing frequency band, and then it is determined whether the current transmission mode of the measuring device 20 is the synchronous mode (step 112). The determination in step 112 is made based on the record stored in the mode change memory unit 54.

[0050] If it is determined that the transmission mode is not synchronous, i.e., asynchronous, the transmission mode is changed to synchronous, and at the same time, a record of "change required" is written in the mode change memory unit 54 to indicate that the mode must be changed back to asynchronous when normal communication is resumed (step 114).

[0051] If it is determined in step 112 that the transmission mode is the synchronous mode, or if the processing of step 114 is completed, then a measurement preparation complete signal 32 is transmitted in the reception frequency band of the measurement request signal 30 (step 116). For example, if the measurement request signal 30 is received in all frequency bands f1 to f3 and preparation for synchronization is complete in all of those frequency bands, the measurement preparation complete signal 32 is transmitted in all frequency bands. Also, if the measurement request signal 30 is received in only a portion of the frequency bands f1 to f3, or preparation for synchronization is complete in only a portion of those frequency bands, the measurement preparation complete signal 32 is transmitted in that portion of the frequency bands.

[0052] After completing the above process, the measurement device 20 determines whether or not it has received the measurement signal 34 from the measurement request device 10 (step 118). This process is repeated until it is determined that the measurement signal 34 has been received.

[0053] Then, when reception of the measurement signal 34 is confirmed, the propagation channel state information CSI is measured for each frequency band based on the received measurement signal 34. Furthermore, a notification signal 36 including the measured CSI is transmitted to the measurement request signal 30 in each frequency band set to the synchronous mode (step 120).

[0054] The above process completes the process that the measuring device 20 must execute for wireless sensing. At this stage, the measuring device 20 determines whether or not there is a record of "change required" in the mode change storage unit 54 (step 122).

[0055] If there is no record of "change required," the current routine is promptly terminated. On the other hand, if there is a record of "change required," the transmission mode of the measuring device 20 is first returned to asynchronous mode. Next, the "change required" is cleared from the mode change storage unit 54 (step 124).

[0056] According to the above process, when performing wireless sensing, the measurement device 20 can proceed with the process with all available frequency bands in synchronous mode. Furthermore, when the process required for wireless sensing is completed, the measurement device 20 can return all frequency bands to asynchronous mode. Once the measurement device 20 returns to asynchronous mode, multiple frequency bands can be freely used between the measurement request device 10 and the measurement device 20, allowing highly efficient information communication. Therefore, the wireless sensing system of this embodiment can achieve both highly accurate wireless sensing and highly efficient information communication.

[0057] [Modification of the first embodiment] In the first embodiment described above, the measurement request device 10 is provided with a single control unit 40 that is used in common by AP1 to AP3. The measurement device 20 is also provided with a transmission mode switching unit 52 and the like that are used in common by STA1 to STA3. However, the configuration of the present disclosure is not limited to this. The function corresponding to the control unit 40 may be provided in each of AP1 to AP3. The function of the transmission mode switching unit 52 and the like may be provided in each of STA1 to STA3.

[0058] Furthermore, in the above-described first embodiment, the measurement request signal 30 and the measurement preparation completion signal 32 are transmitted and received between the measurement request device 10 and the measurement device 20 over all frequency bands. However, the present disclosure is not limited to this. The measurement request signal 30 and the measurement preparation completion signal 32 may be transmitted and received only over a specific frequency band. In this case, if information about available frequency bands is included in these signals, it is possible to realize the same functions as in the first embodiment while slightly reducing the communication load.

[0059] Furthermore, in the first embodiment described above, the synchronous mode is used only during wireless sensing. However, the situation in which the synchronous mode is used is not limited to when wireless sensing is being performed. For example, the synchronous mode may be used when it is necessary to temporarily transmit and receive a large amount of data between the measurement request device 10 and the measurement device 20. Alternatively, when extremely accurate communication is required between the two devices, the synchronous mode can be used to transmit the same data over multiple frequency bands, thereby improving accuracy by utilizing redundancy.

[0060] In the first embodiment described above, the measurement device 20 transmits the notification signal 36 including the CSI, and the measurement requesting device 10 performs location detection or behavior detection. However, the measurement device 20 may perform location detection based on the CSI and provide the result to the measurement requesting device 10. [Explanation of symbols]

[0061] 10 Measurement request device 20 Measuring Equipment 30 Measurement request signal 32 Measurement ready signal 34 Measurement Signal 36 Notification signal 40 Control Unit 42 Measurement request signal generator 48 Measurement signal generator 52 Transmission mode switching section 54 Mode change memory section 56 Measurement preparation complete signal generation section 60 Propagation channel measurement section 62 Notification signal generation unit

Claims

1. A wireless sensing system including a measurement requesting device having a plurality of wireless functions corresponding to different frequency bands in one housing, and a measuring device having a plurality of wireless functions corresponding to different frequency bands in one housing, a measurement request signal transmission process in which the measurement request device transmits a measurement request signal to the measurement device; a synchronization process in which the measurement device receives the measurement request signal and changes the transmission mode to a synchronization mode; a measurement signal transmission process in which the measurement requesting device transmits, after transmitting the measurement request signal, a measurement signal whose characteristics are shared with the measurement device, to the measurement device in a plurality of frequency bands; a CSI detection process in which the measurement device receives the measurement signal and detects propagation channel state information representing the state of a propagation channel for each frequency band; a result calculation process for calculating a result of wireless sensing of a space between the measurement requesting device and the measuring device based on the propagation channel state information detected for a plurality of frequency bands; an asynchronous process in which the measurement device changes the transmission mode to an asynchronous mode when the measurement device completes a process required for executing the wireless sensing; A wireless sensing system configured to perform the above.

2. the measurement request signal transmission process includes a process of transmitting the measurement request signal in all frequency bands that are available at that time, the measurement device executes a process of recognizing all frequency bands in which the measurement request signal is received as sensing frequency bands; The wireless sensing system according to claim 1 , wherein the synchronization process includes a process of setting a transmission mode of the sensing frequency band to the synchronization mode.

3. the measurement device, after executing the synchronization process, executes a process of transmitting a measurement preparation completion signal to the measurement requesting device in the sensing frequency band; The wireless sensing system according to claim 2 , wherein the measurement requesting device recognizes the sensing frequency band based on a frequency band in which the measurement preparation completion signal is received.

4. the measurement signal transmission process includes a process of transmitting the measurement signal in the sensing frequency band; The wireless sensing system according to claim 3 , wherein the CSI detection process includes a process of detecting the propagation channel state information for each of the sensing frequency bands.

5. After the CSI detection process, the measurement device performs a process of transmitting a notification signal including the propagation channel state information to the measurement requesting device in the sensing frequency band; The wireless sensing system according to claim 4 , wherein the result calculation process is executed by the measurement requesting device that receives the notification signal.

6. the synchronization process includes a process of leaving a change record indicating that the transmission mode needs to be changed back to an asynchronous mode; The wireless sensing system according to claim 1 , wherein the asynchronous processing includes a process for clearing the record of the changes that need to be made.

7. A wireless sensing method using a measurement requesting device having a plurality of wireless functions corresponding to different frequency bands in one housing, and a measuring device having a plurality of wireless functions corresponding to different frequency bands in one housing, the measurement request device transmitting a measurement request signal to the measurement device; the measurement device receiving the measurement request signal and changing the transmission mode to a synchronous mode; the measurement requesting device transmits, after transmitting the measurement request signal, a measurement signal having characteristics shared with the measurement device, to the measurement device in a plurality of frequency bands; the measurement device receives the measurement signal and detects propagation channel state information representing a state of a propagation channel for each frequency band; calculating a result of wireless sensing of a space between the measurement requesting device and the measuring device based on the propagation channel state information detected for a plurality of frequency bands; changing the transmission mode to an asynchronous mode when the measurement device completes processing necessary for executing the wireless sensing; A wireless sensing method comprising:

8. A measurement device that realizes a wireless sensing function based on the results of information communication with a measurement requesting device that has multiple wireless functions corresponding to different frequency bands in one housing, It has multiple wireless functions corresponding to different frequency bands in one housing, A process of receiving a measurement request signal emitted from the measurement request device; a process of receiving the measurement request signal and setting the transmission mode to a synchronous mode; receiving, after receiving the measurement request signal, measurement signals emitted from the measurement requesting device in a plurality of frequency bands, the measurement signals having characteristics shared with the measurement device; receiving the measurement signal and detecting propagation channel state information representing the state of the propagation channel for each frequency band; transmitting a notification signal including the propagation channel state information detected for a plurality of frequency bands to the measurement requesting device in the plurality of frequency bands; a measurement device configured to perform

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