Radio station position estimation device, radio station position estimation system, and radio station position estimation method

Abstract

To provide a radio station position estimation device, a radio station position estimation system, and a radio station position estimation method that can measure delay profiles of a plurality of radio stations in a radio communication system and easily perform radio station position estimation.SOLUTION: Provided is a radio station position estimation system having a radio station position estimation device 3 for estimating a radio station position in a radio communication system. The radio station position estimation device receives a radio signal transmitted from a radio station within a search area of the radio station (WRAN mobile station 2) whose position is to be estimated in the radio communication system, acquires identification information of the radio station from a downlink signal in the radio communication system, measures a delay profile, uses the measured delay profile to estimate a position of the radio station, and outputs position estimation information together with the identification information on the radio station, wherein a GIS information display terminal 4 displays the position estimation information of the radio station on a map. Also provided is a radio station position estimation method.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wireless station position measurement system that estimates the position of a wireless station that is a mobile station in a wireless communication system, and more particularly to a wireless station position estimation device, a wireless station position estimation system, and a wireless station position estimation method that can measure a delay profile from a wireless signal and easily estimate the position of a wireless station. [Background technology]

[0002] [Prior Art] Conventionally, in emergency situations such as disasters and crime scenes, public wireless communication systems used by fire departments, ambulances, local governments, etc. have mainly 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.

[0003] 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 conducting 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 to emergency headquarters, etc., mainly in emergency areas such as disaster and crime scenes. 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-shaped network topology is formed.

[0004] 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 the 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.

[0005] [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. 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, as shown in Fig. 9. Here, the WRAN base station and the WRAN mobile stations are sometimes collectively called "wireless stations."

[0006] 9, a WRAN mobile station 2-1 and a WRAN mobile station 2-2 are connected to a WRAN base station 1. In addition, a WRAN mobile station 2-3 is 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.

[0007] 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 a downlink signal and receiving an uplink signal as a higher-level station, and an operation of receiving a downlink signal and transmitting an uplink signal as a lower-level station.

[0008] [Transmission and reception timing of each radio station in a conventional WRAN system: Figure 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 wireless stations. Note that "DL" indicates downlink transmission / downlink reception, and "UL" indicates uplink transmission / uplink reception.

[0009] In a WRAN system, radio bands are allocated on a radio frame basis, as shown in Fig. 10. For example, in frame numbers [1] to [3], the WRAN base station 1 and the WRAN mobile station 2-1 communicate with each other, and in frame numbers [4] to [6], the WRAN mobile station 2-1 and the WRAN mobile station 2-3 communicate with each other.

[0010] In addition, the WRAN mobile station 2-2 and the WRAN mobile station 2-3 are not connected to any lower-level stations, but transmit downstream signals in frames [7] to [9] and

[13] to

[15] . These downstream transmissions include signals necessary to add new lower-level stations to the WRAN system.

[0011] In a wireless communication system, in order to grasp the influence of interference caused by the wireless signals transmitted by the wireless stations and to avoid such interference, it is important to grasp the position of the wireless stations transmitting the wireless signals.

[0012] 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.

[0013] Then, after time has passed, when it can be confirmed that the interfering radio station has moved farther away to the extent that the effects of the interference do not degrade the performance of the wireless communication system, it is possible to return the wireless communication system operated by a user with a low usage priority to its normal operating state.

[0014] [Related Technology] As related prior art, there are Japanese Patent No. 3733920 "Wireless terminal device equipped with position detection function" (Patent Document 1) and Japanese Patent No. 3840412 "Wireless terminal device" (Patent Document 2). Patent Documents 1 and 2 disclose a method of calculating the position of the receiving point of a wireless station by creating a delay profile from the received waves of signals transmitted from a plurality of wireless stations. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Patent No. 3733920 [Patent Document 2] Patent No. 3840412 Summary of the Invention [Problem to be solved by the invention]

[0016] 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.

[0017] Patent Documents 1 and 2 do not describe a configuration for measuring delay profiles from received signals for multiple wireless stations in a wireless communication system and estimating the positions of the wireless stations.

[0018] The present invention has been made in consideration of the above-mentioned situation, and aims to provide a wireless station position estimation device, a wireless station position estimation system, and a wireless station position estimation method that are capable of measuring the delay profile of one or more wireless stations in a wireless communication system and easily estimating the position of the wireless station. [Means for solving the problem]

[0019] In order to solve the problems of the above-mentioned conventional example, the present invention provides 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 comprising: The position estimation calculation unit and the delay profile measurement unit are provided, and prior to estimating the position of the wireless station, a learning radio signal is transmitted to a search area to be subjected to position estimation of the wireless station, the wireless station receives the learning radio signal and measures the learning delay profile, and 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, and 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, 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 position estimation information of the wireless station, which is a third stage of estimation. The present invention is characterized by the above.

[0020] The present invention provides the wireless station position estimation system, , nothing Downlink signal from radio station in wired communication system Knowledge of Get other information Good , rank The present invention is characterized in that the location estimation information is output together with the identification information of the wireless station.

[0021] The present invention is characterized in that, in the above-mentioned radio station position estimation system, it has a display terminal that displays the position of the radio station on a map based on the identification information of the radio station acquired by the radio station position estimation device and the estimated position estimation information.

[0022] The present invention is characterized in that, in the above-mentioned wireless station position estimation system, it comprises a plurality of wireless station position estimation devices having different search areas, the plurality of wireless station position estimation devices are connected via a network, and the network comprises a server that collects and distributes wireless station identification information and position estimation information from the plurality of wireless station position estimation devices.

[0023] The present invention is characterized in that, in the above-mentioned wireless station position estimation system, one or more display terminals are connected to the network, which display the positions of wireless stations on a map based on the identification information of the wireless stations and position estimation information distributed from a server to the network.

[0024] The present invention is characterized in that, in the above-mentioned radio station position estimation system, 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 the frequency deviation correction is completed, and continues to output the held control information to the RF unit.

[0025] The present invention is characterized in that, in the above-mentioned 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 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 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.

[0026] The present invention relates to one or more radio stations in a wireless communication system. a wireless station position estimation device for estimating the position of a wireless station, the wireless station position estimation device comprising a position estimation calculation unit and a delay profile measurement unit, and performing a first-stage sensing step of, prior to estimating the position of the wireless station, transmitting a learning wireless signal to a search area to be the target of position estimation of the wireless station, the wireless station receiving the learning wireless signal and measuring a learning delay profile, linking and collecting a set of position data of the wireless station and the learning delay profile to create position estimation learning data, performing a second-stage learning step of generating a position estimation model by machine learning based on the position estimation learning data, and incorporating the position estimation model into the position estimation calculation unit, and when estimating the position of the wireless station, receiving 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, the delay profile measurement unit measuring the delay profile from the downlink signal in the wireless communication system, and the position estimation calculation unit inputting the delay profile into the position estimation model to calculate the position estimation information of the wireless station, which is a third-stage estimation. The present invention is characterized by the above.

[0027] The present invention relates to a wireless station position estimation device, and Knowledge of Get other information Good , rank The present invention is characterized in that the location estimation information is output together with the identification information of the wireless station.

[0028] The present invention provides a wireless station position estimation method for estimating a position of a wireless station in a wireless communication system, comprising: Equipped with a position estimation calculation section and a delay profile measurement section A wireless station position estimation device Prior to estimating the position of a wireless station, a first-stage sensing step is performed in which a learning wireless signal is transmitted to a search area in which the position of the wireless station is to be estimated, the wireless station receives the learning wireless signal and measures a learning delay profile, and pairs of wireless station position data and learning delay profiles 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 a 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 position estimation information of the wireless station, which is a third-stage estimation. The present invention is characterized by the above. Effect of the Invention

[0029] According to the present invention, there is provided 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 comprising: The position estimation calculation unit and the delay profile measurement unit are provided, and prior to estimating the position of the wireless station, a learning radio signal is transmitted to a search area to be subjected to position estimation of the wireless station, the wireless station receives the learning radio signal and measures the learning delay profile, and 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, and 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, 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 position estimation information of the wireless station, which is a third stage of estimation. The wireless station position estimation system is characterized by the above. With precision This has the advantage that it can be easily carried out.

[0030] According to the present invention, the radio station position estimation system includes a plurality of radio station position estimation devices having different search areas, the plurality of radio station position estimation devices are connected via a network, and the network includes a server that collects and distributes radio station identification information and position estimation information from the plurality of radio station position estimation devices, thereby having the effect of enabling a wide range of search areas to be monitored from a remote location. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a schematic diagram of a wireless station position estimation system. [Diagram 2] 1 is a schematic diagram showing a radio frame structure of a WRAN system. [Diagram 3] FIG. 2 is a schematic diagram showing data of MAP information. [Figure 4] FIG. 1 is a sequence diagram of a position estimation method. [Diagram 5] FIG. 2 is a configuration block diagram of a wireless station position estimation device. [Figure 6] 4 is a schematic diagram showing a data structure of position estimation information; [Figure 7] 4 is a process flowchart of the wireless station position estimation device. [Figure 8] FIG. 2 is a schematic diagram of an extension system of the present system. [Figure 9]FIG. 1 is a schematic diagram of a conventional WRAN system. [Figure 10] FIG. 1 is a schematic diagram showing transmission and reception timing of each wireless station in a conventional WRAN system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] 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.

[0033] According to the present invention, the radio station position estimation system includes a plurality of radio station position estimation devices having different search areas, the plurality of radio station position estimation devices are connected via a network, and the network includes a server that collects and distributes radio station identification information and position estimation information from the plurality of radio station position estimation devices, thereby having the effect of enabling a wide range of search areas to be monitored from a remote location.

[0034] [Wireless station location 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 from a wireless system whose location is to be estimated, and estimates the location from a measured delay profile.

[0035] [First location estimation method] The first location estimation method has the problem that if there is an error in the coordinates once, the error will accumulate because the current location is calculated based on the displacement from the previous location. 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 there may be no means of notification, and there is a problem that it is not always possible to obtain it in real time.

[0036] [Second location 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 for wireless LAN access points. In outdoor operation, the increase in measurement points increases costs, which is an issue.

[0037] [Third location estimation method] The third localization method consists of three stages: sensing, learning, and estimation. In the first stage of sensing, a VHF band radio wave sensor (base station) transmits a radio signal of the WRAN system to the search area for which location estimation is to be performed. A VHF band radio wave sensor (terminal station) receives the signal of the WRAN system at multiple points within the search area and measures the delay profile. The location information of the measurement points is linked to the delay profile and collected to generate data for location estimation training.

[0038] In the second stage of learning, the search area is divided into certain size segments and then classified 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 described above, and creates a location estimation model. In the third stage of estimation, when a wireless station to be located enters the search area, the VHF band sensor (base station) receives the wireless signal transmitted from the wireless station and measures the delay profile. The measured delay profile is input into the location estimation model created in the above learning, and the location cluster of the wireless station is estimated.

[0039] Next, a wireless system that is a target of position estimation by the third position 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 in the radio equipment of radio stations conducting 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 images from the scene of a disaster or incident to a headquarters, etc., mainly in emergency areas. A wireless communication system conforming to ARIB STD-T103 is basically composed 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.

[0040] 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 the multi-stage relay function, which is one of the assumed operation modes. An ARIB STD-T119 compliant wireless communication system (WRAN 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.

[0041] The third location estimation method is described in detail in “[Invited Lecture] Research and Development Overview of a Highly Efficient Spectrum Sharing System Using Radio Big Data from Wide-area WRAN” (Keiichi Mizutani, Hiroshi Harada), IEICE Technical Report, vol. 120, no. 138, SRW2020-15, pp. 31-36, August 2020.

[0042] In order to realize the location estimation of a radio station in a WRAN system using the third location estimation method, it is necessary to measure a delay profile from a radio signal from the WRAN radio station. The case where an existing WRAN radio 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 the delay profile from the radio signal transmitted by a single radio station in the first stage sensing measurement of the third location estimation method.

[0043] However, in the third stage estimation of the third location estimation method, the number of wireless stations to be estimated is not always one, so it is necessary to estimate the locations of multiple wireless stations. In addition, in a WRAN system, each wireless station performs wireless communication by switching the wireless transmission timing in units of wireless frames due to wireless band allocation.

[0044] 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.

[0045] Therefore, in this system, in the third stage of estimation of the third location estimation method, the radio station location estimation device measures the delay profiles of multiple WRAN radio stations present in the search area, estimates the locations of the WRAN radio stations, and outputs the results.

[0046] [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 composed of a WRAN system consisting of a WRAN base station 1 and multiple WRAN mobile stations 2-1 to 2-3, and is configured with at least one wireless station position estimation device 3 and at least one GIS (Geographic Information System) information display terminal 4.

[0047] In this system, a wireless station position estimation device 3 receives wireless signals transmitted from a WRAN base station 1 and 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.

[0048] The wireless station position estimation device 3 is placed near a search area in which the positions of WRAN wireless stations are to be estimated. 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.

[0049] 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.

[0050] [WRAN system radio frame structure: 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 radio frame uses a TDD (Time Division Duplex) duplex method, with the vertical axis representing frequency and the horizontal axis representing time.

[0051] A radio frame (10 milliseconds) is divided into a DL (Down Link) subframe section for transmitting and receiving downlink signals, a UL (Up Link) subframe section for transmitting and receiving uplink signals, and a TTG (Transmit / receive Transition Gap) and an RTG (Receive / transmit Transition Gap) which are gap times to avoid overlapping of downlink and uplink signals.

[0052] The signals in the DL subframe and UL subframe sections will now be described. 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, and 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-level station. The UL data burst area is an area that contains user data.

[0053] [MAP information data structure: 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 composed of DL-MAP and UL-MAP.

[0054] Furthermore, the DL-MAP is made up 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 made up of information on the UL subframe interval length and the configuration of UL data bursts.

[0055] [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 assigned to each wireless station within the WRAN system, and enables identification of the wireless station that transmits the DL-MAP.

[0056] The DL subframe period length is time information indicating the length of the 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.

[0057] [UL-MAP Contents] The contents of the UL-MAP will be explained. The UL subframe period length is time information indicating the length of the UL subframe period within a radio frame. The UL data burst configuration information includes the modulation method and coding rate of the UL data burst, and burst arrangement information within the UL data burst area.

[0058] [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 the downlink signal of the WRAN wireless station, acquires the identification information of the wireless station in the DL-MAP, and calculates the position estimation result using the delay profile measured from the preamble.

[0059] 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 Figure 1 and measures downlink signals, the wireless station position estimation device 3 measures the 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 Figure 10.

[0060] [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].

[0061] 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 position 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.

[0062] [Configuration of wireless station position estimation device 3: Figure 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.

[0063] The antenna 11 receives a radio signal from the WRAN system and outputs it to the RF unit 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.

[0064] The control unit 13 calculates control information for synchronization processing based on the input baseband signal, and outputs it 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.

[0065] 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 calculation based on the third position estimation method described above, and outputs position estimation information to the network interface unit 17.

[0066] The network interface unit 17 inputs the radio station identification information from the radio 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.

[0067] 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 pairs of wireless station position data and delay profile data, performs 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 the third-stage estimation and calculates the 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.

[0068] [Data structure of location estimation information: Figure 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 position estimation information, has a structure in which the identification information and position estimation information of the radio station are combined into a single data set so that the position estimation information corresponding to each radio station can be managed on a radio station-by-radio station basis.

[0069] [Processing flow of the wireless station position estimation device: Figure 7] Next, a processing flow in the wireless station position estimation device will be described with reference to Fig. 7. Fig. 7 is a processing flowchart of the wireless station position estimation device. As shown in FIG. 7, the wireless station position estimation device 3 repeats reception processing of wireless signals of the WRAN system (S1).

[0070] 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 a wireless signal has not 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 uses the delay profile to calculate position estimation information (S4).

[0071] Then, the network interface unit 17 outputs the identification information of the wireless station and the position estimation information from the network interface (S5), and after returning to the top of the flowchart, the process repeats steps S1 to S5.

[0072] In this way, by realizing the best mode for carrying out the invention, it becomes possible to estimate the positions of multiple WRAN radio stations within a search area that is the target of position estimation. In FIG. 1, the search area for estimating the position of the WRAN wireless station does not include the WRAN base station, but the position of not only the WRAN mobile station but also the portable WRAN base station may be estimated.

[0073] [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 the original system, and as shown in FIG. 8, there are multiple search areas, and multiple wireless station position estimation devices 3 and multiple GIS information display terminals 4 are connected via an Internet line 6.

[0074] Specifically, the extended system is configured such that radio station position estimation devices 3-1 to 3-3, GIS information display terminals 4-1 to 4-3, and a position estimation information collection and distribution server 5 are connected by a network 6 such as the Internet line.

[0075] 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.

[0076] 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, thereby making it possible to reduce the traffic load on the lines of the network 6.

[0077] 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, enabling multiple users to simultaneously monitor the search area from multiple remote locations.

[0078] [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.

[0079] According to this system, the GIS information display terminal 4 displays the location estimation information together with the map information, so that the location of the wireless station can be visually recognized, which has the effect of being utilized for measures to avoid interference.

[0080] According to an extended system of this system, a plurality of radio station position estimation devices 3 having different search areas are provided, the plurality of radio station position estimation devices 3 are connected via a network 6, and the network 6 is provided with a position estimation information collection and distribution server 5 that collects and distributes radio station identification information and position estimation information from the plurality of radio station position estimation devices 3, thereby achieving the effect of enabling a wide range of search areas to be monitored from a remote location.

[0081] According to an expansion 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, thereby enabling the location estimation information for radio stations to be shared at multiple locations and enabling multiple users to simultaneously monitor the search area from multiple remote locations. [Industrial Applicability]

[0082] INDUSTRIAL APPLICABILITY 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. [Explanation of symbols]

[0083] 1...WRAN base station, 2...WRAN mobile station, 3...wireless station position estimation device, 4...GIS information display terminal, 5...position estimation information collection and distribution server, 6...network, 11...antenna, 12...RF unit, 13...control unit, 14...wireless station identification information analysis unit, 15...delay profile measurement unit, 16...position estimation calculation unit, 17...network interface unit

Claims

1. 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. 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.

3. 3. 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.

4. 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.

5. 5. The wireless station position estimation system according to claim 4, further comprising one or more display terminals connected to the network for displaying 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.

6. 6. A wireless station position estimation system according to claim 1, wherein the RF unit in the wireless station position estimation device has a control unit that calculates control information necessary for performing 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.

7. 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.

8. 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 according to claim 1, wherein the position estimation calculation unit inputs the delay profile into the position estimation model to calculate the position estimation information of the wireless station, which is a third stage of estimation.

9. A wireless station position estimation device as described in claim 8, characterized in that it obtains 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.

10. 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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