JP7651790B2 - Radio station position estimation device, radio station position estimation system, and radio station position estimation method - Google Patents

Description

The present invention relates to a radio station position measurement system that estimates the position of a radio station that is a mobile station in a radio communication system, and in particular to a radio station position estimation device, radio station position estimation system, and radio station position estimation method that can measure a delay profile from a radio signal and easily estimate the position of a radio station.

[Prior Art]
Conventionally, in emergency situations such as disaster or crime scenes, public wireless communication systems used by fire departments, ambulances, local governments, and the like have primarily transmitted information via voice.
However, considering the recent disaster situation, advanced information gathering, including video data, is necessary to make accurate on-site judgments and take appropriate measures.

The ARIB STD-T103 standard established by the Association of Radio Industries and Businesses (ARIB) specifies the physical layer and media access control layer of broadband mobile communications between portable base stations and mobile stations in the radio equipment of radio stations that perform 200 MHz band broadband mobile radio communications.
Because portable base stations are considered land mobile stations under the Radio Law, they can be flexibly installed and operated wherever necessary, and can transmit on-site video footage to emergency headquarters, etc., primarily in areas where emergencies such as disaster or crime scenes have occurred.
A wireless communication system conforming to ARIB STD-T103 is basically composed of one portable base station and one or more mobile stations, and when composed of multiple mobile stations, a star-type network topology is formed.

On the other hand, ARIB STD-T119 specifies the physical layer, media access control layer and radio network control layer of portable radio equipment of radio stations performing 200 MHz band wideband mobile radio communication specified in the above-mentioned ARIB STD-T103, and in particular specifies a multi-stage relay function, which is one of the assumed operation modes.
An ARIB STD-T119 compliant wireless communication system (hereinafter referred to as a WRAN [Wireless Regional Area Network] system) is composed of a wireless network control scheduler, a portable base station, and a mobile station. When composed of multiple mobile stations, a tree-type (broadly speaking, including serial connection and star-type) network topology is formed.

[Conventional WRAN system: Figure 9]
An outline of a conventional WRAN system will be described with reference to Fig. 9. Fig. 9 is a schematic diagram of a conventional WRAN system.
As shown in Fig. 9, a conventional WRAN system is composed of a WRAN base station 1, a WRAN mobile station 2-1, a WRAN mobile station 2-2, and a WRAN mobile station 2-3. Here, the WRAN base station and the WRAN mobile stations are sometimes collectively called "wireless stations."

9, a WRAN mobile station 2-1 and a WRAN mobile station 2-2 are connected to a WRAN base station 1. A WRAN mobile station 2-3 is also connected to the WRAN mobile station 2-1, forming a multi-stage relay configuration.
The WRAN mobile stations 2-1 to 2-3 are mounted on moving vehicles and perform wireless communication while moving.

In addition, in a wireless connection, the wireless station closer to the WRAN base station 1 is called the "upper station" and the wireless station farther away is called the "lower station," and a wireless signal from the upper station to the lower station is called a "downstream signal," and a wireless signal from the lower station to the upper station is called an "upstream signal."
When performing multi-stage relaying, a WRAN mobile station alternately repeats an operation of transmitting downlink signals and receiving uplink signals as a higher-level station, and an operation of receiving downlink signals and transmitting uplink signals as a lower-level station.

[Transmission and reception timing of each wireless station in a conventional WRAN system: FIG. 10]
Next, the transmission and reception timing of each wireless station in a conventional WRAN system will be described with reference to Fig. 10. Fig. 10 is a schematic diagram showing the transmission and reception timing of each wireless station in a conventional WRAN system. The horizontal axis of Fig. 10 represents time, the vertical axis represents each wireless station in the WRAN system, and the arrows represent the direction of wireless transmission and reception between the wireless stations. Note that "DL" indicates downlink transmission/downlink reception, and "UL" indicates uplink transmission/uplink reception.

In a WRAN system, as shown in FIG. 10, wireless bands are allocated on a wireless frame basis. For example, in frame numbers [1] to [3], WRAN base station 1 and WRAN mobile station 2-1 communicate with each other, and in frame numbers [4] to [6], WRAN mobile station 2-1 and WRAN mobile station 2-3 communicate with each other.

Furthermore, WRAN mobile station 2-2 and WRAN mobile station 2-3 are not connected to any lower-level stations, but transmit downstream signals in frame numbers [7] to [9] and [13] to [15]. These downstream transmissions include signals necessary to add new lower-level stations to the WRAN system.

In a wireless communication system, it is important to know the location of the wireless station that transmits the wireless signal in order to understand the effects of interference from the wireless signal transmitted by the wireless station and to avoid the interference.

An example of how to utilize the information obtained when the location of the wireless station that is the source of interference is identified will be described below.
In a situation where users with different usage priorities are operating wireless communication systems in close proximity to each other for a certain wireless system, if it is confirmed that a wireless station of a user with a high usage priority is approaching a communication area operated by a user with a low usage priority while transmitting an interfering wireless signal, it is possible to reduce or avoid performance degradation of the wireless system caused by interference between the wireless communication systems by lowering the wireless transmission output level of the wireless communication system operated by the user with the low usage priority or by stopping wireless transmission.

Then, after time has passed and it has been confirmed that the interfering radio station has moved far enough away that the effects of the interference do not degrade the performance of the wireless communication system, it is possible to return wireless communication systems operated by users with low usage priority to their normal operating state.

[Related Technology]
Related prior art includes Japanese Patent No. 3733920 "Wireless terminal device with position detection function" (Patent Document 1) and Japanese Patent No. 3840412 "Wireless terminal device" (Patent Document 2).
Japanese Patent Application Laid-Open No. 2003-233633 and Japanese Patent Application Laid-Open No. 2003-233635 disclose a method of calculating the position of a receiving point of a wireless station by creating a delay profile from received waves of signals transmitted from a plurality of wireless stations.

Patent No. 3733920 Patent No. 3840412

However, conventional wireless communication systems operate to maintain synchronization with a wireless signal from a specific wireless station, and therefore have the problem that in a wireless environment in which the transmitting wireless station switches on a wireless frame-by-wireless frame basis, it is not easy to receive the wireless signals transmitted from each wireless station and generate or measure a delay profile for position detection.

Note that Patent Documents 1 and 2 do not describe a configuration for measuring delay profiles from received signals and estimating the positions of multiple wireless stations in a wireless communication system.

The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a wireless station position estimation device, a wireless station position estimation system, and a wireless station position estimation method that can measure the delay profile of one or more wireless stations in a wireless communication system and easily estimate the position of the wireless station.

The present invention for solving the problems of the above-mentioned conventional example is a wireless station position estimation system having a wireless station position estimation device that estimates the positions of one or more wireless stations in a wireless communication system, the wireless station position estimation device including a position estimation calculation unit and a delay profile measurement unit, and prior to estimating the position of the wireless station, a first-stage sensing is performed in which a learning wireless signal is transmitted to a search area that is a target for estimating the position of the wireless station, the wireless station receives the learning wireless signal and measures a learning delay profile, and a pair of wireless station position data and the learning delay profile are linked and collected to create position estimation learning data, a second-stage learning is performed in which a position estimation model is generated by machine learning based on the position estimation learning data, and the position estimation model is incorporated into the position estimation calculation unit, and when estimating the position of the wireless station, a downlink signal in the wireless communication system transmitted from a wireless station in the search area from outside the wireless communication system without being connected to the wireless communication system is received, the delay profile measurement unit measures the delay profile from the downlink signal in the wireless communication system, and the position estimation calculation unit inputs the delay profile into the position estimation model to calculate the wireless station position estimation information, which is a third-stage estimation .

The present invention is characterized in that in the wireless station position estimation system, the wireless station position estimation device acquires identification information of the wireless station from a downlink signal in the wireless communication system, and outputs position estimation information together with the identification information of the wireless station.

The present invention is characterized in that the wireless station position estimation system has a display terminal that displays the position of the wireless station on a map based on the identification information of the wireless station acquired by the wireless station position estimation device and the estimated position estimation information.

The present invention is characterized in that the wireless station position estimation system includes a plurality of wireless station position estimation devices having different search areas, the plurality of wireless station position estimation devices are connected to a network, and the network includes a server that collects and distributes wireless station identification information and position estimation information from the plurality of wireless station position estimation devices.

The present invention is characterized in that the wireless station position estimation system is connected to one or more display terminals that display the positions of wireless stations on a map based on the identification information and position estimation information of the wireless stations distributed from a server to the network.

The present invention is characterized in that in the above-mentioned wireless station position estimation system, the RF unit in the wireless station position estimation device has a control unit that calculates control information required to perform frequency deviation correction, and the control unit holds the control information when the frequency deviation correction is completed, and continues to output the held control information to the RF unit.

The present invention is characterized in that in the wireless station position estimation system, the wireless station position estimation device has an identification information analysis unit that acquires identification information of the wireless station from MAP information in the downlink signal of the wireless frame in the received signal, a delay profile measurement unit that measures a delay profile from a preamble in the downlink signal of the wireless frame, a position estimation calculation unit that performs calculations to estimate the position of the wireless station from the measured delay profile and outputs position estimation information, and an interface unit that outputs the acquired identification information of the wireless station and position estimation information.

The present invention provides a wireless station position estimation device that estimates the positions of one or more wireless stations in a wireless communication system, the wireless station position estimation device comprising a position estimation calculation unit and a delay profile measurement unit, and is characterized in that, prior to estimating the position of the wireless station, a learning wireless signal is transmitted to a search area that is to be the target of wireless station position estimation, the wireless station receives the learning wireless signal and measures the learning delay profile, a first stage of sensing is performed in which a pair of wireless station position data and the learning delay profile are linked and collected to create position estimation learning data, a second stage of learning is performed in which a position estimation model is generated by machine learning based on the position estimation learning data, the position estimation model is incorporated into the position estimation calculation unit, and when estimating the position of the wireless station, a downlink signal in the wireless communication system transmitted from a wireless station in the search area from outside the wireless communication system without being connected to the wireless communication system is received, the delay profile measurement unit measures the delay profile from the downlink signal in the wireless communication system, and the position estimation calculation unit inputs the delay profile into the position estimation model to calculate the wireless station position estimation information, which is a third stage of estimation .

The present invention is characterized in that in the wireless station position estimation device, identification information of the wireless station is obtained from a downlink signal in a wireless communication system, and position estimation information is output together with the identification information of the wireless station.

The present invention is a wireless station position estimation method for estimating the position of a wireless station in a wireless communication system, characterized in that a wireless station position estimation device including a position estimation calculation unit and a delay profile measurement unit , prior to estimating the position of the wireless station, transmits a learning wireless signal to a search area which is a target of wireless station position estimation, the wireless station receives the learning wireless signal and measures a learning delay profile, and performs a first-stage sensing in which a pair of wireless station position data and the learning delay profile are linked and collected to create position estimation learning data, and performs a second-stage learning in which a position estimation model is generated by machine learning based on the position estimation learning data, and the position estimation model is incorporated into the position estimation calculation unit, and when estimating the position of the wireless station, a downlink signal in the wireless communication system transmitted from a wireless station in the search area from outside the wireless communication system without being connected to the wireless communication system is received, the delay profile measurement unit measures the delay profile from the downlink signal in the wireless communication system, and the position estimation calculation unit inputs the delay profile into the position estimation model to calculate the wireless station position estimation information, which is a third-stage estimation .

According to the present invention, there is provided a wireless station position estimation system having a wireless station position estimation device that estimates the positions of one or more wireless stations in a wireless communication system, the wireless station position estimation device including a position estimation calculation unit and a delay profile measurement unit, and prior to estimating the position of the wireless station, a first-stage sensing is performed in which a learning wireless signal is transmitted to a search area that is a target of wireless station position estimation, the wireless station receives the learning wireless signal and measures a learning delay profile, and a pair of wireless station position data and learning delay profile are linked and collected to create position estimation learning data, and a second-stage learning is performed in which a position estimation model is generated by machine learning based on the position estimation learning data, and the position estimation model is incorporated into the position estimation calculation unit, and when estimating the position of the wireless station, a downlink signal in the wireless communication system transmitted from a wireless station in the search area from outside the wireless communication system without being connected to the wireless communication system is received, the delay profile measurement unit measures the delay profile from the downlink signal in the wireless communication system, and the position estimation calculation unit inputs the delay profile into the position estimation model to calculate wireless station position estimation information, which is a third-stage estimation , thereby providing an effect of easily estimating the position of the wireless station with high accuracy .

According to the present invention, the wireless station position estimation system includes a plurality of wireless station position estimation devices having different search areas, the plurality of wireless station position estimation devices are connected to a network, and the network includes a server that collects and distributes wireless station identification information and position estimation information from the plurality of wireless station position estimation devices, so that a wide range of search areas can be monitored from a remote location.

FIG. 1 is a schematic diagram of a wireless station position estimation system. 1 is a schematic diagram showing a radio frame structure of a WRAN system. FIG. 2 is a schematic diagram showing MAP information data. FIG. 1 is a sequence diagram of a position estimation method. FIG. 2 is a configuration block diagram of a wireless station position estimation device. 4 is a schematic diagram showing a data structure of position estimation information; 4 is a process flowchart of the wireless station position estimation device. FIG. 2 is a schematic diagram of an extension system of the present system. 1 is a schematic diagram of a conventional WRAN system. 1 is a schematic diagram showing the transmission and reception timing of each wireless station in a conventional WRAN system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
[Outline of the embodiment]
A wireless station position estimation system according to an embodiment of the present invention (this wireless station position estimation system/this system) is a wireless station position estimation system in which a wireless station position estimation device, which estimates the position of a wireless station in a wireless communication system, receives a wireless signal transmitted from a wireless station within a search area of the wireless station that is the subject of position estimation in the wireless communication system, obtains identification information of the wireless station from the downlink signal in the wireless communication system and measures a delay profile, estimates the position of the wireless station using the measured delay profile, and outputs the position estimation information together with the identification information of the wireless station, thereby making it easy to estimate the position of a wireless station.

According to the present invention, the wireless station position estimation system includes a plurality of wireless station position estimation devices having different search areas, the plurality of wireless station position estimation devices are connected to a network, and the network includes a server that collects and distributes wireless station identification information and position estimation information from the plurality of wireless station position estimation devices, so that a wide range of search areas can be monitored from a remote location.

[Wireless station position estimation method]
Before describing this system, three estimation methods for estimating the position of a wireless station will be described.
The first location estimation method uses a sensor installed in a wireless station, the second location estimation method uses a received signal strength indicator (RSSI) measured when a wireless signal is received, and the third location estimation method receives a wireless signal of a wireless system to be located and estimates the location from a measured delay profile.

[First position estimation method]
The first location estimation method has a problem that, since the current location is calculated based on the displacement from the previous location, if there is an error in the coordinates once, the error accumulates. In addition, the location information needs to be obtained from the wireless station or the wireless system that constitutes the wireless station, but such information may be kept secret or may not have a means of notification, and therefore, there is a problem that it is not always possible to obtain it in real time.

[Second Position Estimation Method]
The second location estimation method will be explained using the example of a wireless LAN (Local Area Network) system. The accuracy of location estimation of a wireless LAN terminal depends on the measurement points of wireless LAN access points, and when there are few wireless LAN access points around the wireless LAN terminal, the accuracy of location estimation decreases.
To improve the accuracy of location estimation, it is necessary to increase the number of measurement points of wireless LAN access points. In outdoor operation, the increase in the number of measurement points increases costs.

[Third position estimation method]
The third location estimation method consists of three stages: sensing, learning, and estimation.
In the first stage of sensing, a VHF radio wave sensor (base station) transmits a radio signal of a WRAN system to a search area to be the target of position estimation. A VHF radio wave sensor (terminal station) receives the signal of the WRAN system at multiple points in the search area and measures the delay profile. The position information of the measurement points and the delay profile are linked and collected to generate data for position estimation learning.

In the second stage of learning, the search area is divided into certain sizes into location clusters. The location estimation server performs machine learning on the relationship between each location cluster and the delay profile measured by the sensing, and creates a location estimation model.
In the third stage of estimation, when a wireless station to be located enters the search area, a VHF band sensor (base station) receives a wireless signal transmitted from the wireless station and measures a delay profile. The measured delay profile is input to the location estimation model created in the above learning, and the location cluster of the wireless station is estimated.

Next, a wireless system that is a target of location estimation by the third location estimation technique will be described.
The ARIB STD-T103 standard established by the Association of Radio Industries and Businesses (ARIB) specifies the physical layer and media access control layer of broadband mobile communications between portable base stations and mobile stations among the radio equipment of radio stations that perform 200 MHz band broadband mobile radio communications.
Since a portable base station is a land mobile station under the Radio Law, it can be flexibly installed and operated wherever necessary, and can transmit on-site video to emergency headquarters, etc., mainly in emergency areas such as disaster sites and crime sites. An ARIB STD-T103-compliant wireless communication system basically consists of one portable base station and one or multiple mobile stations, and when multiple mobile stations are used, a star-shaped network topology is formed.

On the other hand, ARIB STD-T119 specifies the physical layer, media access control layer and radio network control layer of portable radio equipment of radio stations performing 200 MHz band wideband mobile radio communication specified in the above-mentioned ARIB STD-T103, and in particular specifies a multi-stage relay function, which is one of the assumed operation modes.
A wireless communication system (WRAN system) compliant with ARIB STD-T119 is composed of a wireless network control scheduler, a portable base station, and a mobile station. When composed of multiple mobile stations, a tree-type (broadly speaking, including serial connection and star-type) network topology is formed.

The third location estimation method is described in detail in "[Invited Lecture] Research and Development Overview of Highly Efficient Spectrum Sharing System Using Radio Big Data from Wide-area WRAN" (Mizutani Keiichi, Harada Hiroshi), IEICE Technical Report, vol. 120, no. 138, SRW2020-15, pp. 31-36, August 2020.

In order to realize the location estimation of a wireless station in a WRAN system using the third location estimation method, it is necessary to measure a delay profile from a wireless signal from the WRAN wireless station. A case where an existing WRAN wireless station is used as a device for measuring the delay profile will be described.
Because existing WRAN radio stations operate to maintain synchronization with radio signals from a specific radio station, it is relatively easy to measure a delay profile from a radio signal transmitted by a single radio station in the first stage sensing measurement of the third location estimation method.

However, in the third stage estimation of the third location estimation method, the number of wireless stations to be estimated is not limited to one, so it is necessary to estimate the positions of multiple wireless stations. In a WRAN system, wireless band allocation causes each wireless station to switch wireless transmission timing on a wireless frame basis to perform wireless communication.

As such, existing WRAN radio stations operate to maintain synchronization with radio signals from a specific radio station, so in a wireless environment where the source radio station switches on a radio frame-by-radio frame basis, it is extremely difficult to receive the radio signals transmitted from each radio station and measure the delay profile.

Therefore, in this system, in the third stage of estimation of the third location estimation method, the wireless station location estimation device measures the delay profiles of multiple WRAN wireless stations present in the search area, estimates the locations of the WRAN wireless stations, and outputs the results.

[This system: Figure 1]
Next, an overview of this system will be described with reference to Fig. 1. Fig. 1 is a schematic diagram of this wireless station position estimation system.
As shown in FIG. 1, this system is configured with a WRAN base station 1 and a plurality of WRAN mobile stations 2-1 to 2-3, and at least one wireless station position estimation device 3 and at least one GIS (Geographic Information System) information display terminal 4.

In this system, the wireless station position estimation device 3 receives wireless signals transmitted from the WRAN base station 1 and the WRAN mobile stations 2-1 to 2-3 from outside the WRAN system without being connected to the WRAN system, and estimates the positions of the WRAN base station 1 and the WRAN mobile stations 2-1 to 2-3 using the received signals.

The wireless station position estimation device 3 is placed near a search area for estimating the positions of WRAN wireless stations. In Fig. 1, a WRAN mobile station 2-1 and a WRAN mobile station 2-3 exist within the search area.
The wireless station position estimation device 3 can receive wireless signals from the WRAN mobile station 2-1 and the WRAN mobile station 2-3, but cannot receive wireless signals from the WRAN base station 1 and the WRAN mobile station 2-2.
The GIS information display device 4 is connected to the wireless station position estimation device 3 via a network.

The wireless station position estimation device 3 receives wireless signals of the WRAN system, and notifies the GIS information display device 4 of the identification information and position estimation information of the WRAN wireless station, which are the results of analysis and measurement.
The GIS information display device 4 displays the notified identification information and location estimation information of the WRAN radio station together with map information.

[Radio frame structure of WRAN system: Figure 2]
Next, the radio frame structure of the WRAN system will be described with reference to Fig. 2. Fig. 2 is a schematic diagram showing the radio frame structure of the WRAN system.
As shown in FIG. 2, the WRAN system uses a time division duplex (TDD) duplex method for its radio frame, with the vertical axis representing frequency and the horizontal axis representing time.

A radio frame (10 milliseconds) is divided into a DL (Down Link) subframe section for transmitting and receiving downstream signals, a UL (Up Link) subframe section for transmitting and receiving upstream signals, and a TTG (Transmit/Receive Transition Gap) and an RTG (Receive/Transmit Transition Gap) that are gap times to avoid overlapping of downstream and upstream signals.

The signals in the DL subframe and UL subframe sections will be described below.
The preamble is a signal for performing synchronization processing in the reception processing of a downstream signal.
The FCH (Frame Check Header) is a signal that includes configuration information of the MAP information (modulation method, error correction method, MAP data size).
The DL data burst area is an area that contains user data.
The ranging area is an area that includes signals necessary for synchronizing the upstream signal from the lower station.
The UL data burst area is an area that contains user data.

[Data structure of MAP information: Figure 3]
Next, the data structure of the MAP information in the radio frame will be described with reference to Fig. 3. Fig. 3 is a schematic diagram showing the data of the MAP information.
As shown in FIG. 3, the MAP information data is made up of DL-MAP and UL-MAP.

Furthermore, the DL-MAP is composed of a MAP data length, a radio frame number, identification information of a radio station, a DL subframe interval length, and configuration information of a DL data burst.
Furthermore, the UL-MAP is composed of information on the UL subframe interval length and the configuration of the UL data burst.

[DL-MAP Contents]
The contents of DL-MAP will be explained.
The MAP data length is the data length of the entire MAP information.
The radio frame number is a number for identifying a radio frame, which is incremented at each radio frame period.
The wireless station identification information is a unique number that is assigned to each wireless station in the WRAN system, and enables identification of the wireless station that transmits the DL-MAP.

The DL subframe period length is time information indicating the length of a DL subframe period within a radio frame.
The DL data burst configuration information includes the modulation method and coding rate of the DL data burst, and burst arrangement information within the DL data burst area.

[UL-MAP Contents]
The contents of UL-MAP will be explained.
The UL subframe period length is time information indicating the length of a UL subframe period within a radio frame.
The configuration information of the UL data burst includes the modulation method and coding rate of the UL data burst, and burst arrangement information within the UL data burst area.

[Operation of wireless station position estimation device 3]
Next, the operation of the wireless station position estimation device 3 in this system will be described.
The wireless station position estimation device 3 measures downlink signals from WRAN wireless stations, acquires identification information of the wireless stations in the DL-MAP, and calculates a position estimation result using a delay profile measured from the preamble.

In addition, since the wireless station position estimation device 3 is capable of receiving wireless signals from WRAN wireless stations present within the search area shown in FIG. 1 and measures downlink signals, the wireless station position estimation device 3 measures downlink signals transmitted from WRAN mobile station 2-1 and WRAN mobile station 2-3 with frame numbers [4] to [9] at the transmission and reception timing of each wireless station shown in FIG. 10.

[Location estimation method of this system: Figure 4]
The location estimation method in this system will be described with reference to Fig. 4. Fig. 4 is a sequence diagram of the location estimation method.
The flow of wireless signal transmission and reception at the transmission and reception timing of each wireless station shown in FIG. 10, together with the processing flow of the wireless station position estimation device 3 and the GIS information display device 4 shown in FIG. 1, is shown in the sequence diagram of FIG.
As shown in FIG. 4, it is indicated that the wireless station position estimation device 3 is to measure downlink signals transmitted from the WRAN mobile station 2-1 and the WRAN mobile station 2-3 in frame numbers [4] to [9].

In frame number [4], the wireless station position estimation device 3 receives a downlink signal from the WRAN wireless station 2-1 and notifies the GIS information display device 4 of the wireless station identification information obtained by analyzing the MAP information and the position estimation information calculated using the delay profile measured from the preamble.
The GIS information display device 4 displays the notified location estimation information together with map information.
The processing by the wireless station position estimation device 3 and the GIS information display device 4 in frame numbers [5] to [9] is similar to the processing in frame number [4] above, and therefore description thereof will be omitted.

[Configuration of wireless station position estimation device 3: FIG. 5]
Next, the configuration of the wireless station position estimation device 3 in this system will be described with reference to Fig. 5. Fig. 5 is a block diagram showing the configuration of the wireless station position estimation device.
As shown in FIG. 5 , the wireless station position estimation device 3 is composed of an antenna 11, an RF (Radio Frequency) unit 12, a control unit 13, a wireless station identification information analysis unit 14, a delay profile measurement unit 15, a position estimation calculation unit 16, and a network interface unit 17.

The antenna 11 receives a radio signal from the WRAN system and outputs it to the RF section 12 .
The RF unit 12 converts the frequency of the input radio signal of the WRAN system into a baseband signal, and outputs the baseband signal to the control unit 13 , the wireless station identification information analysis unit 14 , and the delay profile measurement unit 15 .

The control unit 13 calculates control information for synchronization processing based on the input baseband signal, and outputs the control information to the RF unit 12. Specifically, the control information is calculated for frame timing control, frequency deviation correction, gain control, and the like.
The RF unit 12 performs synchronization processing using the input control information.
The control unit 13 also has a function of holding control information when the frequency deviation correction is completed, and continuously outputting the held control information for the frequency deviation correction to the RF unit 12 .

The wireless station identification information analysis unit 14 analyzes the MAP information in the input downlink baseband signal, acquires the wireless station identification information, and outputs it to the network interface unit 17 .
The delay profile measurement unit 15 measures a delay profile from the preamble in the downstream signal of the input baseband signal, and outputs the measured delay profile to the position estimation calculation unit 16 .
The position estimation calculation unit 16 uses the input delay profile to perform position estimation calculations based on the third position estimation technique described above, and outputs position estimation information to the network interface unit 17 .

The network interface unit 17 inputs the wireless station identification information from the wireless station identification information analysis unit 14 and the position estimation information from the position estimation calculation unit 16, edits them into the data structure shown in Figure 6, and transmits and outputs them to the GIS information display terminal 4 via the network interface.

Here, the wireless station position estimation device 3 performs a large number of first-stage sensing operations of the third position estimation method, acquires multiple sets of wireless station position data and delay profile data, performs a second-stage learning based on these data, and incorporates the learned position estimation model into the position estimation calculation unit 16, which inputs the delay profile data measured by the delay profile measurement unit 15 into the position estimation model to perform a third-stage estimation and calculates a position estimate.
Therefore, the first stage sensing and the second stage learning are carried out separately, and the wireless station position estimation device 3 carries out the third stage estimation.

[Data structure of location estimation information: FIG. 6]
Next, the data structure of the position estimation information will be described with reference to Fig. 6. Fig. 6 is a schematic diagram showing the data structure of the position estimation information.
As shown in FIG. 6, the data structure of the location estimation information is made up of identification information of a wireless station, location estimation information, and an end code.
In other words, the GIS information display terminal 4, which inputs the location estimation information, has a structure in which the identification information and location estimation information of the radio station are combined into a single data set so that the location estimation information corresponding to each radio station can be managed on a radio station-by-radio station basis.

[Processing flow of the wireless station position estimation device: FIG. 7]
Next, a process flow in the wireless station position estimation device will be described with reference to Fig. 7. Fig. 7 is a process flow chart of the wireless station position estimation device.
As shown in FIG. 7, the wireless station position estimation device 3 repeats the reception process of wireless signals from the WRAN system (S1).

After receiving the wireless signal (if Yes), the identification information analysis unit 14 of the wireless station analyzes the MAP information in the received downlink signal to obtain the identification information of the wireless station (S2).
If no wireless signal has been received (No), the wireless signal reception determination process S1 is repeated.
Next, the delay profile measurement unit 15 measures the delay profile from the preamble in the received downlink signal (S3), and the position estimation calculation unit 16 calculates position estimation information using the delay profile (S4).

Then, the network interface unit 17 outputs the wireless station identification information and location estimation information from the network interface (S5), and after returning to the top of the flowchart, steps S1 to S5 are repeated.

In this manner, by realizing the best mode for carrying out the invention, it becomes possible to estimate the positions of a plurality of WRAN radio stations within a search area that is the subject of position estimation.
In addition, in FIG. 1, the search area for estimating the position of the WRAN wireless station does not include WRAN base stations, but it is also possible to estimate the position of not only WRAN mobile stations but also mobile WRAN base stations.

[Expansion system of this system: Figure 8]
Next, an extension system to which this system is applied will be described with reference to Fig. 8. Fig. 8 is a schematic diagram of an extension system of this system.
The extended system is an advanced version of this system, and as shown in FIG. 8, there are a plurality of search areas, and a plurality of wireless station position estimation devices 3 and a plurality of GIS information display terminals 4 are connected via an Internet line 6.

Specifically, the extended system is configured such that the wireless station position estimation device 3-1 to wireless station position estimation device 3-3, the GIS information display terminal 4-1 to GIS information display terminal 4-3, and the position estimation information collection and distribution server 5 are connected by a network 6 such as an Internet line.

The position estimation information calculated by each of the wireless station position estimation devices 3-1 to 3-3 is temporarily collected in a position estimation information collection and distribution server 5 via a network (Internet line) 6.
The collected position estimation information is distributed by the position estimation information collection and distribution server 5 to the GIS information display terminals 4-1 to 4-3, and the position estimation information is displayed together with the map information.

In addition, each of the GIS information display terminals 4-1 to 4-3 sets information related to the desired location estimation information (e.g., search areas 1 to 3, radio station identification information, or distribution cycle, etc.) in the location estimation information collection and distribution server 5, and controls the distribution information, making it possible to reduce the traffic load on the lines of the network 6.

This example of an expanded system configuration makes it possible to grasp the locations of WRAN radio stations over a wide range of multiple search areas, and also enables the sharing of location estimation information at multiple locations, allowing multiple users to simultaneously monitor the search area from multiple remote locations.

[Effects of the embodiment]
According to this system, a wireless station position estimation device 3, which estimates the position of a wireless station in a wireless communication system, receives a wireless signal transmitted from a wireless station within a search area of the wireless station to be the target of position estimation in the wireless communication system, obtains identification information of the wireless station from the downlink signal in the wireless communication system and measures a delay profile, estimates the position of the wireless station using the measured delay profile, and outputs the position estimation information together with the identification information of the wireless station, thereby making it easy to estimate the position of the wireless station.

According to this system, the GIS information display terminal 4 displays location estimation information together with map information, which has the effect of allowing users to visually recognize the location of wireless stations and utilize this information to take measures to avoid interference.

According to an extension system of this system, a plurality of wireless station position estimation devices 3 having different search areas are provided, the plurality of wireless station position estimation devices 3 are connected to a network 6, and the network 6 is provided with a position estimation information collection and distribution server 5 that collects and distributes wireless station identification information and position estimation information from the plurality of wireless station position estimation devices 3, thereby enabling a wide range of search areas to be monitored from a remote location.

According to the expanded system of this system, multiple GIS information display terminals 4 connected to the network 6 request the server 5 to deliver and display location estimation information for a specific search area or a specific radio station, so that the location estimation information for the radio station can be shared at multiple locations, and multiple users can simultaneously monitor the search area from multiple remote locations.

The present invention is suitable for a wireless station position estimation device, a wireless station position estimation system, and a wireless station position estimation method that can measure the delay profile of one or more wireless stations in a wireless communication system and easily estimate the position of the wireless station.

1...WRAN base station, 2...WRAN mobile station, 3...Radio station position estimation device, 4...GIS information display terminal, 5...Location estimation information collection and distribution server, 6...Network, 11...Antenna, 12...RF section, 13...Control section, 14...Radio station identification information analysis section, 15...Delay profile measurement section, 16...Location estimation calculation section, 17...Network interface section

Claims (10)

A wireless station position estimation system having a wireless station position estimation device that estimates the position of one or more wireless stations in a wireless communication system,
The wireless station position estimation device includes:
A position estimation calculation unit and a delay profile measurement unit are provided,
Prior to estimating the position of the wireless station, a first-stage sensing step is performed in which a learning wireless signal is transmitted to a search area that is to be the target of position estimation of the wireless station, the wireless station receives the learning wireless signal and measures a learning delay profile, and a pair of position data of the wireless station and the learning delay profile are linked and collected to create position estimation learning data, a second-stage learning step is performed in which a position estimation model is generated by machine learning based on the position estimation learning data, and the position estimation model is incorporated into the position estimation calculation unit,
When estimating the position of the wireless station, a downlink signal in the wireless communication system transmitted from the wireless station within the search area is received from outside the wireless communication system without being connected to the wireless communication system;
the delay profile measurement unit measures a delay profile from a downlink signal in the wireless communication system;
a position estimation calculation unit inputting the delay profile into the position estimation model to calculate position estimation information of the wireless station, which is a third stage of estimation ; 2. The wireless station position estimation system according to claim 1 , wherein the wireless station position estimation device acquires identification information of the wireless station from a downlink signal in the wireless communication system, and outputs the position estimation information together with the identification information of the wireless station. The wireless station position estimation system according to claim 2, further comprising a display terminal that displays the position of the wireless station on a map based on the identification information of the wireless station acquired by the wireless station position estimation device and the estimated position estimation information. a plurality of the wireless station position estimation devices each having a different search area, the plurality of the wireless station position estimation devices being connected via a network;
4. The wireless station position estimation system according to claim 2, further comprising a server in the network for collecting and distributing the identification information and the position estimation information of the wireless stations from the plurality of wireless station position estimation devices. The wireless station position estimation system according to claim 4, characterized in that one or more display terminals are connected to the network, which display the positions of the wireless stations on a map based on the identification information and the position estimation information of the wireless stations distributed from the server. A radio station position estimation system according to any one of claims 1 to 5, characterized in that the RF unit in the radio station position estimation device has a control unit that calculates control information necessary to perform frequency deviation correction, and the control unit holds the control information when frequency deviation correction is completed, and continues to output the held control information to the RF unit. The wireless station position estimation device includes:
an identification information analysis unit that acquires the identification information of the wireless station from MAP information in a downlink signal of a wireless frame in a received signal;
a delay profile measurement unit that measures a delay profile from a preamble in a downlink signal of the radio frame;
a location estimation calculation unit that performs calculations to estimate a location of the wireless station from the measured delay profile and outputs location estimation information;
7. The wireless station position estimation system according to claim 1, further comprising an interface unit that outputs the acquired identification information and position estimation information of the wireless station. A wireless station position estimation device that estimates a position of one or more wireless stations in a wireless communication system, comprising:
The wireless station position estimation device includes:
A position estimation calculation unit and a delay profile measurement unit are provided,
Prior to estimating the position of the wireless station, a first-stage sensing step is performed in which a learning wireless signal is transmitted to a search area that is to be the target of position estimation of the wireless station, the wireless station receives the learning wireless signal and measures a learning delay profile, and a pair of position data of the wireless station and the learning delay profile are linked and collected to create position estimation learning data, a second-stage learning step is performed in which a position estimation model is generated by machine learning based on the position estimation learning data, and the position estimation model is incorporated into a position estimation calculation unit,
When estimating the position of the wireless station, a downlink signal in the wireless communication system transmitted from the wireless station within the search area is received from outside the wireless communication system without being connected to the wireless communication system;
the delay profile measurement unit measures a delay profile from a downlink signal in the wireless communication system;
The wireless station position estimation device, wherein the position estimation calculation unit inputs the delay profile into the position estimation model to calculate position estimation information of the wireless station, which is a third stage of estimation . 9. The wireless station position estimation device according to claim 8, further comprising: acquiring identification information of the wireless station from a downlink signal in the wireless communication system; and outputting the position estimation information together with the identification information of the wireless station. A method for estimating a position of a wireless station in a wireless communication system, comprising:
A wireless station position estimation device including a position estimation calculation unit and a delay profile measurement unit ,
Prior to estimating the position of the wireless station, a first-stage sensing step is performed in which a learning wireless signal is transmitted to a search area that is to be the target of position estimation of the wireless station, the wireless station receives the learning wireless signal and measures a learning delay profile, and a pair of position data of the wireless station and the learning delay profile are linked and collected to create position estimation learning data, a second-stage learning step is performed in which a position estimation model is generated by machine learning based on the position estimation learning data, and the position estimation model is incorporated into the position estimation calculation unit,
When estimating the position of the wireless station, a downlink signal in the wireless communication system transmitted from the wireless station within the search area is received from outside the wireless communication system without being connected to the wireless communication system;
the delay profile measurement unit measures a delay profile from a downlink signal in the wireless communication system;
a position estimation calculation unit inputting the delay profile into the position estimation model to calculate position estimation information of the wireless station, which is a third stage of estimation ;

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