JP2020134196A - Communication device, measuring device, communication system, computer program, and measuring method - Google Patents

Abstract

To improve the efficiency of measuring distance between a base station and a terminal.SOLUTION: A measuring device includes: a search signal transmission unit for transmitting a search signal; a response signal reception unit for receiving a response signal corresponding to the search signal; and a measuring unit for measuring distance between a communication device that has transmitted the response signal and its own measuring device based on a time from transmission timing of the search signal to reception timing of the response signal. The communication device includes: a wireless reception unit for receiving the search signal transmitted from the measuring device; a detection unit for detecting a specific position of the search signal; and a wireless transmission unit for transmitting a response signal at a constant interval from detection timing of the specific position.SELECTED DRAWING: Figure 1

Description

The present invention relates to communication devices, measuring devices, communication systems, computer programs and measuring methods.

Conventionally, as a distance measuring technique for measuring the distance between an access point (AP) and a station (STA) of a wireless LAN (Local Area Network), for example, the FTM (Fine Time Measurement) technique described in Non-Patent Document 1 has been used. Are known. In the conventional FTM technique described in Non-Patent Document 1, the STA requests the FTM from the AP, the AP transmits an FTM signal for measurement, and the STA returns an ACK signal in response to the reception of the FTM signal. The AP measures the distance between the AP and the STA based on the signal propagation time from the transmission of the FTM signal to the reception of the ACK signal. At this time, since the STA performs the processing specified by the signal processing protocol of the wireless LAN, the processing time in the STA is not constant in each measurement and the processing time varies. Therefore, in the conventional FTM technique, the measurement is performed a plurality of times and the average value of the measurement results is obtained.

M. Ibrahim et al., “Verification: Accuracy Evaluation of WiFi Fine Time Measurements on an Open Platform,” Mobicom 2018.

However, in the conventional FTM technology described above, since one STA is measured a plurality of times, the measurement time required for each measurement is long, and the individual distances between the AP and a large number of STAs can be determined. It takes a lot of measurement time to measure. Further, since the measurement is started by requesting the FTM from the STA to the AP, when the measurement of a plurality of STAs is performed, the measurement must be scheduled in advance for the STA, which is troublesome.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to improve the efficiency of measuring the distance between a base station and a terminal.

(1) One aspect of the present invention is a wireless receiving unit that receives a search signal transmitted from a measuring device, a detection unit that detects a specific position of the search signal, and a constant interval from the detection timing of the specific position. It is a communication device including a wireless transmission unit that transmits a response signal.
(2) One aspect of the present invention is the communication device according to (1) above, wherein the specific position is a specific bit of the preamble of the search signal.

(3) One aspect of the present invention is a search signal transmission unit that transmits a search signal, a response signal reception unit that receives a response signal corresponding to the search signal, and reception of the response signal from the transmission timing of the search signal. A measuring device including a measuring device for measuring the distance between the communication device that transmitted the response signal and the self-measuring device based on the time until the timing, and a search signal transmitted from the measuring device are received. A communication system including a wireless receiving unit, a detecting unit that detects a specific position of the search signal, and a wireless transmitting unit that transmits a response signal at regular intervals from the detection timing of the specific position. is there.
(4) One aspect of the present invention further includes a reference communication device that is the communication device and has a known distance from the measurement device and exists in the LOS environment, and the search signal transmission unit is the reference. The search signal is transmitted to the communication device, and the measuring unit determines the time from the transmission timing of the search signal to the reference communication device to the reception timing of the response signal transmitted from the reference communication device, and the measurement device. The communication system according to (3) above, wherein the measurement of the distance is calibrated by using the known distance between the device and the reference communication device.
(5) One aspect of the present invention further includes a reference communication device that is the communication device and has a known distance from the measurement device and exists in the LOS environment, and the search signal transmission unit is the reference. The search signal is transmitted to the communication device, and the measuring device uses the received power of the response signal transmitted from the reference communication device and a known distance between the measuring device and the reference communication device. The distance between the LOS determination unit that determines whether or not the communication device to be measured exists in the LOS environment and the communication device to be measured associated with the determination result of whether or not the communication device exists in the LOS environment is measured. The communication system according to (3) above, further comprising a measurement result output unit for outputting the result.

(6) One aspect of the present invention is a search signal transmission unit that transmits a search signal, a response signal reception unit that receives a response signal corresponding to the search signal, and reception of the response signal from the transmission timing of the search signal. A measuring device including a measuring unit that measures the distance between the communication device (1) that transmitted the response signal and the self-measuring device based on the time until the timing, and the search signal transmitting unit. Transmits the search signal to the reference communication device which is the communication device and whose distance to the measuring device is known and exists in the LOS environment, and the measuring unit transmits the search signal to the reference communication device. Calibration of the measurement of the distance using the time from the transmission timing of the above to the reception timing of the response signal transmitted from the reference communication device and the known distance between the measurement device and the reference communication device. It is a measuring device that performs.

(7) One aspect of the present invention is a search signal transmission unit that transmits a search signal, a response signal reception unit that receives a response signal corresponding to the search signal, and reception of the response signal from the transmission timing of the search signal. A measuring device including a measuring unit that measures the distance between the communication device (1) that transmitted the response signal and the self-measuring device based on the time until the timing, and the search signal transmitting unit. Transmits the search signal to the reference communication device which is the communication device and whose distance to the measuring device is known and exists in the LOS environment, and the measuring device is transmitted from the reference communication device. A LOS determination unit that determines whether or not the communication device to be measured exists in the LOS environment by using the received power of the response signal and a known distance between the measurement device and the reference communication device. The measurement device further includes a measurement result output unit that outputs a measurement result of a distance of the communication device to be measured, which is associated with a determination result of whether or not the device exists in the LOS environment.

(8) One aspect of the present invention is a wireless reception step of receiving a search signal transmitted from a measuring device to a computer of a communication device, a detection step of detecting a specific position of the search signal, and detection of the specific position. It is a computer program for executing a wireless transmission step of transmitting a response signal at regular intervals from the timing.

(9) One aspect of the present invention is the communication to the computer of the measuring device based on the time from the transmission timing of the search signal to the communication device of (1) to the reception timing of the response signal corresponding to the search signal. A measurement step for measuring the distance between the device and the measuring device and a search signal for the reference communication device which is the communication device and the distance between the measuring device is known and exists in the LOS environment are transmitted. From the search signal transmission step, the response signal reception step of receiving the response signal corresponding to the search signal to the reference communication device, and the transmission timing of the search signal to the reference communication device, the response signal transmitted from the reference communication device It is a computer program for executing a calibration step of calibrating a measurement of a distance using a time to a reception timing and a known distance between the measuring device and the reference communication device.

(10) One aspect of the present invention is a measurement target based on the time from the transmission timing of the search signal to the communication device of the above (1) to the reception timing of the response signal corresponding to the search signal to the computer of the measurement device. A measurement step for measuring the distance between the communication device and the measurement device, and a search signal for a reference communication device for which the distance between the communication device and the measurement device is known and exists in the LOS environment. The search signal transmission step for transmitting the above, the response signal reception step for receiving the response signal corresponding to the search signal to the reference communication device, the reception power of the response signal transmitted from the reference communication device, the measuring device, and the measurement device. The LOS determination step of determining whether or not the communication device to be measured exists in the LOS environment and the determination of whether or not the communication device to be measured exists in the LOS environment by using a known distance from the reference communication device. It is a computer program for executing a measurement result output step for outputting a measurement result of the distance of the communication device to be measured associated with the result.

(11) In one aspect of the present invention, a search signal transmission step in which the measuring device transmits a search signal, a wireless reception step in which the communication device receives the search signal, and the communication device specifying the search signal. A detection step for detecting a position, a wireless transmission step in which the communication device transmits a response signal at regular intervals from the detection timing of the specific position, and a response signal reception step in which the measurement device receives the response signal. A measurement method including a measurement step in which the measuring device measures the distance between the communication device and the self-measuring device based on the time from the transmission timing of the search signal to the reception timing of the response signal. is there.

According to the present invention, it is possible to improve the efficiency of measuring the distance between the base station and the terminal.

It is a figure which shows the structural example of the base station (measurement apparatus) and IoT terminal (communication apparatus) which concerns on one Embodiment. It is a figure which shows the configuration example of the communication system which concerns on one Embodiment. It is explanatory drawing for demonstrating the response signal transmission method which concerns on one Embodiment. It is a flowchart which shows the example of the LOS determination method which concerns on one Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration example of a base station (measuring device) and an IoT terminal (communication device) according to an embodiment. FIG. 2 is a diagram showing a configuration example of a communication system according to the present embodiment. In the communication system according to the present embodiment, the base station BS and the IoT terminal TE communicate wirelessly. The IoT terminal TE transmits various data to the data processing server SV via the base station BS. Examples of data handled by the IoT terminal TE include meteorological observation data such as temperature and humidity, measurement data of usage of electricity and gas, sensor detection data of various sensors, and imaging data of surveillance cameras.

In this embodiment, the base station BS has a function of a measuring device. The base station BS measures the distance between the IoT terminal TE registered under the own base station BS and the own base station BS. In the measurement of the distance according to the present embodiment, the base station BS transmits the search signal 110, and when the IoT terminal TE receives the search signal 110, the response signal 120 is transmitted, and the base station BS responds from the transmission timing of the search signal 110. The distance between the own base station BS and the IoT terminal TE is measured based on the time until the reception timing of the signal 120. In this measurement, the IoT terminal TE is configured so that the interval from receiving the search signal 110 to transmitting the response signal 120 is constant.

Further, the base station BS may measure the position of the IoT terminal TE in cooperation with other base stations (measuring devices) BSa and BSb.

[Base station (measuring device)]
FIG. 1 mainly shows the function of the measuring device among the functions of the base station BS. In FIG. 1, the base station BS includes a preamble generation unit 11, a terminal identification information (terminal ID) storage unit 12, a search signal transmission unit 13, a transmission control unit 14, a response signal reception unit 15, and a preamble detection unit. 16, a measurement unit 17, a LOS determination unit 18, and a measurement result output unit 19 are provided.

The preamble generation unit 11 generates a preamble. This preamble is a bit pattern for the IoT terminal TE to detect a radio frame transmitted from the base station BS. The terminal ID storage unit 12 stores the terminal ID of the IoT terminal TE registered under the base station BS.

The search signal transmission unit 13 transmits the search signal 110 in accordance with the transmission instruction from the transmission control unit 14. The search signal 110 is composed of a wireless frame including a preamble and a terminal ID of the IoT terminal TE to be searched. The preamble generated by the preamble generation unit 11 is stored in the head portion of the wireless frame. As for the terminal ID, among the terminal IDs stored in the terminal ID storage unit 12, the terminal ID of one IoT terminal TE to be searched is stored in a predetermined portion of the wireless frame of the search signal 110. Further, the radio frame of the search signal 110 may further store the current time information indicating the current time. The current time information in the wireless frame of the search signal 110 is used to correct the time of the clock provided in the IoT terminal TE.

The transmission control unit 14 controls the transmission of the search signal 110. The transmission control unit 14 instructs the search signal transmission unit 13 to transmit the search signal 110. In many IoT terminals TE, the power source is a battery. Power saving is required for the battery-type IoT terminal TE. Therefore, the measurement time (for example, every Sunday at midnight) is determined in advance so that all the IoT terminals TE registered under the base station BS shift from the sleep state to the activation state at the measurement time. Keep it. When the measurement time arrives, the transmission control unit 14 directs the search signal transmission unit 13 to transmit the search signal 110 to all the IoT terminals TE registered under the base station BS as search targets one by one. .. The transmission control unit 14 outputs a transmission timing signal A indicating the transmission timing of the search signal 110 for the IoT terminal TE to be searched to the measurement unit 17. As an example of the present embodiment, the transmission timing signal A is a signal indicating the timing at which the preamble of the radio frame of the search signal 110 is transmitted.

The response signal receiving unit 15 receives the response signal 120. The response signal 120 is transmitted by the IoT terminal TE that has received the search signal 110 transmitted from the search signal transmission unit 13 of the base station BS. Like the search signal 110, the response signal 120 is composed of a radio frame including a preamble and a terminal ID of the IoT terminal TE that transmits the response signal 120.

The preamble detection unit 16 detects the preamble of the radio frame of the response signal 120. The preamble detects the beginning of the radio frame of the response signal 120. The preamble detection unit 16 outputs a reception timing signal B indicating the reception timing of the response signal 120 to the measurement unit 17. As an example of the present embodiment, the reception timing signal B is a signal indicating the timing at which the preamble of the radio frame of the response signal 120 is detected.

The measuring unit 17 measures the distance between the IoT terminal TE that transmitted the response signal 120 and the own base station BS based on the time from the transmission timing of the search signal 110 to the reception timing of the response signal 120. Specifically, the measurement unit 17 performs a predetermined calculation for converting the time from the transmission timing of the search signal 110 to the reception timing of the response signal 120 into a distance. The transmission timing of the search signal 110 is indicated by the transmission timing signal A. The reception timing of the response signal 120 is indicated by the reception timing signal B.

The LOS determination unit 18 determines whether or not the IoT terminal TE exists in the LOS (Line of Sight) environment. The IoT terminal TE existing in the LOS environment exists within a range directly visible from the antenna of the base station BS and within a range in which radio signals can be transmitted and received. The IoT terminal TE that does not exist in the LOS environment exists in the NLOS (Non Line Of Sight) environment. The distance between the reference terminal reTE and the base station BS and the received power of the response signal 120 transmitted from the reference terminal reTE are used to determine whether or not the IoT terminal TE exists in the LOS environment. The distance between the reference terminal reTE and the base station BS is known. The reference terminal reTE exists in the LOS environment. The configuration in which the reference terminal reTE receives the search signal 110 and transmits the response signal 120 is the same configuration as the IoT terminal TE. The LOS determination unit 18 outputs the determination result “LOS environment or NLOS environment” of whether or not the IoT terminal TE exists in the LOS environment to the measurement result output unit 19.

The measurement result output unit 19 outputs the measured value of the distance between the base station BS and the IoT terminal TE measured by the measurement unit 17. The measurement result output unit 19 may output the measured value of the distance of the IoT terminal TE in association with the determination result “LOS environment or NLOS environment” of whether or not the IoT terminal TE exists in the LOS environment. For example, the measured value of the distance of the IoT terminal TE determined to exist in the NLOS environment may be output as a reference value.

The measuring unit 17 may calibrate the distance measurement using the reference terminal reTE. The measurement unit 17 transmits a search signal 110 whose search target is the reference terminal reTE, and receives a response signal 120 from the reference terminal reTE. The measurement unit 17 has a time from the transmission timing of the search signal 110 whose search target is the reference terminal reTE to the reception timing of the response signal 120 transmitted from the reference terminal reTE, and between the base station BS and the reference terminal reTE. Calibrate distance measurements using known distances. The calibration of the distance measurement is performed by correcting a predetermined operation of converting the time from the transmission timing of the search signal 110 to the reception timing of the response signal 120 into a distance.

The base station BS according to the present embodiment may be realized by dedicated hardware, or is composed of a CPU (Central Processing Unit), a memory, and the like to realize the functions of each part. The function may be realized by the CPU executing a computer program for the purpose.

[IoT terminal (communication device)]
FIG. 1 mainly shows the functions related to distance measurement among the functions of the IoT terminal TE. In FIG. 1, the IoT terminal TE includes a wireless reception unit 31, a preamble detection unit 32, a reception data processing unit 33, a response data generation unit 34, a preamble generation unit 35, and a wireless transmission unit 36.

The radio receiving unit 31 receives the search signal 110 transmitted from the base station BS. The preamble detection unit 32 detects the preamble of the radio frame of the search signal 110 received by the radio reception unit 31. The preamble detects the beginning of the radio frame of the search signal 110. The preamble detection unit 32 detects a specific position of the search signal 110. The preamble detection unit 32 outputs a detection timing signal C indicating the detection timing of the specific position to the wireless transmission unit 36. As an example of this embodiment, the specific position of the search signal 110 is the specific th bit of the preamble. In this case, the detection timing signal C is a signal indicating the timing at which the specific th bit of the preamble of the search signal 110 is detected.

The reception data processing unit 33 processes the reception data included in the search signal 110. Specifically, it is determined whether or not the terminal ID included in the search signal 110 is the terminal ID of the own IoT terminal TE. When the terminal ID included in the search signal 110 is the terminal ID of the own IoT terminal TE, the reception data processing unit 33 instructs the response data generation unit 34 to generate the response data. On the other hand, when the terminal ID included in the search signal 110 is not the terminal ID of the own IoT terminal TE, the reception data processing unit 33 does not instruct the response data generation unit 34 to generate the response data.

Further, the received data processing unit 33 corrects the time of the clock of the own IoT terminal TE based on the current time information included in the search signal 110.

The response data generation unit 34 generates the response data to be included in the response signal 120 in response to the response data generation instruction from the reception data processing unit 33. The response data includes the terminal ID of the own IoT terminal TE. The response data generation unit 34 outputs the response data to the wireless transmission unit 36.

The preamble generation unit 35 generates a preamble to be included in the response signal 120. This preamble is a bit pattern for the base station BS to detect a radio frame transmitted from the IoT terminal TE.

The wireless transmission unit 36 transmits the response signal 120 at regular intervals from the detection timing of the specific position of the search signal 110. The response signal 120 is composed of a radio frame including a preamble and response data. As for the preamble, the one generated by the preamble generation unit 35 is stored in the head portion of the wireless frame. The response data generated by the response data generation unit 34 is stored in a predetermined portion of the radio frame of the response signal 120. The detection timing of the specific position of the search signal 110 is indicated by the detection timing signal C. The wireless transmission unit 36 transmits the response signal 120 at regular intervals from the detection timing indicated by the detection timing signal C. The fixed interval is preset. The constant interval is indicated by, for example, a constant bit length. In this case, the wireless transmission unit 36 transmits the response signal 120 at a timing when a certain bit length has elapsed from the detection timing indicated by the detection timing signal C.

The IoT terminal TE according to the present embodiment may be realized by dedicated hardware, or is composed of a CPU, a memory, or the like, and the CPU executes a computer program for realizing the functions of each part. By doing so, the function may be realized.

The reference terminal reTE has the same configuration as the IoT terminal TE shown in FIG.

[Response signal transmission method]
The response signal transmission method according to the present embodiment will be described with reference to FIG. FIG. 3 is an explanatory diagram for explaining a response signal transmission method according to the present embodiment. In FIG. 3, the head portion of the search signal 110 is a preamble. The preamble detection unit 32 of the IoT terminal TE sequentially performs sampling ta1, ta2, ..., Tan at the sampling frequency from the beginning of the search signal 110. The preamble detection unit 32 detects a specific position of the search signal 110. As an example here, the specific position of the search signal 110 is the first bit of the preamble. The preamble detection unit 32 outputs a detection timing signal C indicating the timing at which the first bit of the preamble of the search signal 110 is detected to the wireless transmission unit 36.

The wireless transmission unit 36 transmits the response signal 120 at regular intervals P from the detection timing indicated by the detection timing signal C. In the example of FIG. 3, the first sampling ta1 for the search signal 110 is used as the timing when the first bit of the preamble of the search signal 110 is detected. Then, transmission of the first bit of the first preamble of the response signal 120 is started at a constant interval P from sampling ta1. The constant interval P is, for example, 250 bits long. In this case, the wireless transmission unit 36 transmits the first bit of the first preamble of the response signal 120 at the timing “sampling tb1” when a time 250 bits longer has elapsed from the detection timing “sampling ta1” indicated by the detection timing signal C. To start.

As described above, according to the present embodiment, the IoT terminal TE is configured so that the interval from the reception of the search signal 110 to the transmission of the response signal 120 is constant. As a result, the measured value of the distance in the base station BS is not easily affected by the processing time in the IoT terminal TE, so that it is not necessary to perform multiple measurements on one IoT terminal TE, and the base. It is possible to improve the efficiency of measuring the distance between the station BS and the IoT terminal TE.

[LOS judgment method]
The LOS determination method according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing an example of the LOS determination method according to the present embodiment.

(Step S1) The LOS determination unit 18 acquires the distance Dm, which is the measurement data of the measurement result of the IoT terminal TE to be LOS determined, and the received power Pm of the response signal 120. The distance Dm is obtained from the measuring unit 17. The received power Pm is acquired from the response signal receiving unit 15.

(Step S2) The LOS determination unit 18 acquires the known distance Dr of the reference terminal reTE and the received power Pr of the response signal 120 which is the measurement data of the measurement result of the reference terminal reTE. The known distance Dr of the reference terminal reTE is set in advance in the base station BS. The received power Pr is acquired from the response signal receiving unit 15.

(Step S3) The LOS determination unit 18 calculates the modified received power Pc by the following equation.
Pc = Pm × (Dr ÷ Dm) ²
The modified received power Pc is a value corresponding to the case where the distance of the IoT terminal TE is Dr. In the above-mentioned calculation formula of the modified received power Pc, the square law is used as the propagation attenuation of the radio wave.

(Step S4) The LOS determination unit 18 calculates the evaluation value R by the following equation.
R = Pc ÷ Pr

(Step S5) The LOS determination unit 18 determines whether or not the evaluation value R is smaller than the threshold value Vth. The threshold value Vth is set in advance in the base station BS. If the evaluation value R is smaller than the threshold value Vth, the process proceeds to step S7, and if not, the process proceeds to step S6.

(Step S6) The LOS determination unit 18 determines that the IoT terminal TE to be LOS determined exists in the LOS environment.

(Step S7) The LOS determination unit 18 determines that the IoT terminal TE to be LOS determined exists in the NLOS environment.

The measurement result output unit 19 may output the measured value Dm of the measurement data of the IoT terminal TE to be LOS determined in association with the LOS determination result “LOS environment or NLOS environment”.

Further, the measurement result output unit 19 may output the measured value Dm of the measurement data of the IoT terminal TE determined to exist in the NLOS environment as a reference value. Alternatively, the measurement result output unit 19 may not output the measured value Dm of the measurement data of the IoT terminal TE determined to exist in the NLOS environment.

According to the above-described embodiment, it is not necessary to perform a plurality of measurements on one IoT terminal TE, and the measurement time can be shortened. This makes the effect of shortening the measurement time particularly remarkable when there are a large number of IoT terminals TE registered under the base station BS. For example, one of the features of the communication standard for 5th generation mobile phones called 5G is mMTC (massive Machine Type Communication). In mMTC, it is assumed that communication can be performed without problems even when IoT terminals are arranged extremely densely at 1 million units / km ² . For this reason, it is necessary to install the base station in an appropriate place or to make the radio resources (frequency, time, beam emission time, etc.) of the base station appropriate, and for this purpose, a huge number are required. Understanding the distribution of IoT terminals is an issue. As an example of a method of grasping the distribution of a huge number of IoT terminals, measuring the distance from an existing base station to each IoT terminal and grasping the distribution of the distance from the existing base station to the IoT terminal can be mentioned. Be done. However, in the conventional distance measuring technique, the measurement time is long and impractical, but according to the present embodiment, the measurement time is shortened to facilitate the distance measurement of a huge number of IoT terminals. Can be done.

Further, since the power consumption of the IoT terminal can be suppressed by shortening the measurement time, it is possible to contribute to extending the life of the battery as compared with the battery-type IoT terminal.

In FIG. 2, the base station BS may measure the position of the IoT terminal TE by three-point positioning in cooperation with other base stations (measuring devices) BSa and BSb. The base stations BSa and BSb have the same configuration as the base station BS shown in FIG. Each base station BSa, BSb measures the distance between itself and the IoT terminal TE, and notifies the base station BS of the measured value of the distance. The base station BS uses the measured value of the distance between itself and the IoT terminal TE and the measured value of the distance notified from each base station BSa and BSb to determine the position of the IoT terminal TE by three-point positioning. Measure.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within a range not deviating from the gist of the present invention are also included.

For example, the base station BS may determine that the IoT terminal TE has an abnormality when the response signal 120 is not received from the IoT terminal TE.

Further, in the above-described embodiment, the function of the measuring device is provided in the base station of the wireless communication system, but the measuring device may be an independent device. For example, it may be configured as a portable measuring device having the function of the measuring device of the base station BS shown in FIG. 1 described above. As an application example of the portable measuring device, each participant of a group action in which a specific number of participants such as a tour bus trip participates carries an IoT terminal TE, and each participant's IoT is carried by the portable measuring device at a meeting place. The distance between the terminals TE may be measured, and the gathering status (at or not at the meeting place) of each participant may be determined from this measurement result.

Further, a computer program for realizing the functions of the above-described devices may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed. The "computer system" referred to here may include hardware such as an OS and peripheral devices.
The "computer-readable recording medium" is a flexible disk, a magneto-optical disk, a ROM, a writable non-volatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disc), and a built-in computer system. A storage device such as a hard disk.

Further, the "computer-readable recording medium" is a volatile memory (for example, DRAM (Dynamic)) inside a computer system that serves as a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. It also includes those that hold the program for a certain period of time, such as Random Access Memory)).
Further, the program may be transmitted from a computer system in which this program is stored in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the "transmission medium" for transmitting a program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the above-mentioned functions. Further, a so-called difference file (difference program) may be used, which can realize the above-mentioned functions in combination with a program already recorded in the computer system.

11 ... Preamble generation unit, 12 ... Terminal ID storage unit, 13 ... Search signal transmission unit, 14 ... Transmission control unit, 15 ... Response signal reception unit, 16 ... Preamble detection unit, 17 ... Measurement unit, 18 ... LOS judgment unit, 19 ... Measurement result output unit, 31 ... Wireless reception unit, 32 ... Preamble detection unit, 33 ... Received data processing unit, 34 ... Response data generation unit, 35 ... Preamble generation unit, 36 ... Wireless transmission unit, BS, BSa, BSb ... base station (measuring device), reTE ... reference terminal (communication device), TE ... IoT terminal (communication device)

Claims (11)

A wireless receiver that receives the search signal transmitted from the measuring device,
A detection unit that detects a specific position of the search signal and
A wireless transmitter that transmits a response signal at regular intervals from the detection timing of the specific position,
A communication device equipped with. The specific position is the specific bit of the preamble of the search signal.
The communication device according to claim 1. The response is based on the search signal transmission unit that transmits the search signal, the response signal reception unit that receives the response signal corresponding to the search signal, and the time from the transmission timing of the search signal to the reception timing of the response signal. A measuring device including a measuring unit for measuring the distance between the communication device that transmitted the signal and the self-measuring device, and
A wireless receiving unit that receives a search signal transmitted from the measuring device, a detecting unit that detects a specific position of the search signal, and a wireless transmitting unit that transmits a response signal at regular intervals from the detection timing of the specific position. A communication device equipped with,
Communication system including. The communication device further includes a reference communication device whose distance from the measuring device is known and which exists in the LOS environment.
The search signal transmission unit transmits the search signal to the reference communication device, and the search signal transmission unit transmits the search signal to the reference communication device.
The measuring unit knows the time from the transmission timing of the search signal to the reference communication device to the reception timing of the response signal transmitted from the reference communication device, and the known time between the measuring device and the reference communication device. To calibrate the distance measurement using
The communication system according to claim 3. The communication device further includes a reference communication device whose distance from the measuring device is known and which exists in the LOS environment.
The search signal transmission unit transmits the search signal to the reference communication device, and the search signal transmission unit transmits the search signal to the reference communication device.
The measuring device is
Whether the communication device to be measured exists in the LOS environment by using the received power of the response signal transmitted from the reference communication device and the known distance between the measurement device and the reference communication device. The LOS judgment unit that judges whether or not
It further includes a measurement result output unit that outputs a measurement result of the distance of the communication device to be measured, which is associated with the determination result of whether or not it exists in the LOS environment.
The communication system according to claim 3. A search signal transmitter that transmits a search signal,
A response signal receiving unit that receives a response signal corresponding to the search signal,
A measuring unit that measures the distance between the communication device according to claim 1 and the self-measuring device that transmitted the response signal, based on the time from the transmission timing of the search signal to the reception timing of the response signal. It is a measuring device equipped with
The search signal transmission unit transmits the search signal to the reference communication device that is the communication device and has a known distance from the measurement device and exists in the LOS environment.
The measuring unit knows the time from the transmission timing of the search signal to the reference communication device to the reception timing of the response signal transmitted from the reference communication device, and the known time between the measuring device and the reference communication device. To calibrate the distance measurement using
measuring device. A search signal transmitter that transmits a search signal,
A response signal receiving unit that receives a response signal corresponding to the search signal,
A measuring unit that measures the distance between the communication device according to claim 1 and the self-measuring device that transmitted the response signal, based on the time from the transmission timing of the search signal to the reception timing of the response signal. It is a measuring device equipped with
The search signal transmission unit transmits the search signal to the reference communication device that is the communication device and has a known distance from the measurement device and exists in the LOS environment.
The measuring device is
Whether the communication device to be measured exists in the LOS environment by using the received power of the response signal transmitted from the reference communication device and the known distance between the measurement device and the reference communication device. The LOS judgment unit that judges whether or not
It further includes a measurement result output unit that outputs a measurement result of the distance of the communication device to be measured, which is associated with the determination result of whether or not it exists in the LOS environment.
measuring device. To the computer of the communication device
A wireless reception step that receives the search signal transmitted from the measuring device, and
A detection step for detecting a specific position of the search signal and
A wireless transmission step of transmitting a response signal at regular intervals from the detection timing of the specific position, and
A computer program to run. On the computer of the measuring device
A measurement step of measuring the distance between the communication device and the measurement device based on the time from the transmission timing of the search signal to the communication device according to claim 1 to the reception timing of the response signal corresponding to the search signal. When,
A search signal transmission step of transmitting a search signal to a reference communication device that is the communication device and has a known distance from the measurement device and exists in the LOS environment.
A response signal receiving step for receiving a response signal corresponding to a search signal for the reference communication device, and
Using the time from the transmission timing of the search signal to the reference communication device to the reception timing of the response signal transmitted from the reference communication device, and the known distance between the measurement device and the reference communication device. , Calibration steps to calibrate distance measurements,
A computer program to run. On the computer of the measuring device
The distance between the communication device to be measured and the measurement device is measured based on the time from the transmission timing of the search signal to the communication device according to claim 1 to the reception timing of the response signal corresponding to the search signal. Measurement steps to be performed and
A search signal transmission step of transmitting a search signal to a reference communication device that is the communication device and has a known distance from the measurement device and exists in the LOS environment.
A response signal receiving step for receiving a response signal corresponding to a search signal for the reference communication device, and
Whether or not the communication device to be measured exists in the LOS environment by using the received power of the response signal transmitted from the reference communication device and the known distance between the measurement device and the reference communication device. The LOS judgment step to judge whether
A measurement result output step for outputting the measurement result of the distance of the communication device to be measured associated with the determination result of whether or not it exists in the LOS environment, and
A computer program to run. A search signal transmission step in which the measuring device transmits a search signal,
A wireless reception step in which the communication device receives the search signal, and
A detection step in which the communication device detects a specific position of the search signal,
A wireless transmission step in which the communication device transmits a response signal at regular intervals from the detection timing of the specific position.
A response signal receiving step in which the measuring device receives the response signal,
A measurement step in which the measuring device measures the distance between the communication device and the self-measuring device based on the time from the transmission timing of the search signal to the reception timing of the response signal.
Measurement method including.

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