JP7003326B2 - Receiving terminal, transmission / reception system, wireless transmission device, reception method and transmission / reception method - Google Patents

Description

The present invention relates to a receiving terminal for estimating a user's position, a transmitting / receiving system, a wireless transmitting device, a receiving method, and a transmitting / receiving method.

In recent years, indoor positioning technology using short-range wireless communication such as BLE (Bluetooth (registered trademark) Low Energy), which is short-range wireless communication, has been known. For example, a mobile information terminal such as a smartphone or tablet owned by a user measures the received power from a wireless transmission device. A system has been developed that measures the position of a mobile information terminal from the received power measured by the mobile information terminal and provides information such as guidance and advertisements according to the position of the user who owns the mobile information terminal. In such a system, it is necessary to accurately estimate the user's position even in the presence of a plurality of wireless transmission devices.

Therefore, information processing that estimates the area where the user is staying by counting the wireless transmitter from the identification number included in the received data, which is associated with the area where the identification number corresponding to the wireless transmitter is installed. There is an apparatus (see, for example, Patent Document 1). Further, in this information processing apparatus, a predetermined threshold value is set for the received power in order to reduce the processing required for positioning. If the received power is extremely strong, it is estimated that the user is staying in the area where the corresponding wireless transmitter is installed, and if the received power is extremely weak, the wireless transmitter is installed. It is estimated that the user is not or is staying outside the area.

JP-A-2017-198567 (pages 7-9, 6-8)

However, in the device described in Patent Document 1, the position is estimated based on the identification number and the received power included in the data received from the wireless transmission device installed in each area. If the wireless transmitter is not installed near the area where the user is staying, or if it is out of order, data cannot be acquired from the wireless transmitter near the user. Therefore, there is a possibility that the user is presumed to be staying in an area different from the area where the user is staying, and there is a problem that the position of the user cannot be accurately estimated.

The present invention has been made to solve the above-mentioned problems, and the wireless transmission device is not installed near the area where the receiving terminal owned by the user exists, or the wireless transmission device is out of order. Even in this case, it is an object of the present invention to provide a receiving terminal, a transmitting / receiving system, and a wireless transmitting device capable of accurately estimating the position of the receiving terminal possessed by the user.

The receiving terminal according to the present invention is a receiving terminal that receives transmission data transmitted from a plurality of wireless transmission devices installed in a plurality of areas, and receives transmission data from the plurality of wireless transmission devices to transmit data. Identification with a wireless receiver that measures the received power when receiving a message, and a transmission data information analysis unit that acquires transmission data from the wireless receiver and extracts an identification number that identifies the installation position of the wireless transmitter from the transmission data. A transmission data information storage unit that registers the number and the received power from the wireless transmitter corresponding to the identification number in the received power table, and a predetermined number of received powers are acquired from the received power table and based on the predetermined number of received powers. The received power integrated value from the wireless transmission device corresponding to the identification number is calculated, the reception order is determined for the identification number according to the magnitude of the received power integrated value, and the wireless transmission device is identified by the reception order and the identification number. It is characterized by including a position estimation unit that estimates the position of the receiving terminal based on the installation position of the receiver terminal.

The present invention accurately estimates the position of the receiving terminal possessed by the user even when the wireless transmitting device is not installed near the area where the receiving terminal possessed by the user exists, or even if the wireless transmitting device is out of order. can do.

It is a block diagram schematically showing the structure of the transmission / reception system which concerns on Embodiment 1 of this invention. It is a figure which shows the installation example of the wireless transmission device in the vehicle of the train which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the identification number table of the wireless transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the received power table stored in the transmission data information storage part which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the reception time table stored in the transmission data information storage part which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the received power table which compared the average value and integrated value of the received power which concerns on Embodiment 1 of this invention. It is a graph which showed the time change of the received power integrated value which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the calculation result of the received power integrated value for each identification number which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the calculation result of the received power integrated value for each identification number which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the calculation result of the received power integrated value for each identification number which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the content table stored in the content storage part of the receiving terminal which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the content which is displayed on the display part which concerns on Embodiment 1 of this invention. It is a flowchart which shows the process which the receiving terminal which concerns on Embodiment 1 of this invention performs. It is a flowchart which shows the position estimation process performed by the receiving terminal which concerns on Embodiment 1 of this invention. It is a block diagram schematically showing the structure of the transmission / reception system which concerns on Embodiment 2 of this invention. It is a graph which showed the time change of the received power integrated value by comparing the case where the threshold value is changed and the case where the threshold value is not changed which concerns on Embodiment 2 of this invention. It is a flowchart which shows the process which the receiving terminal which concerns on Embodiment 2 of this invention performs.

Hereinafter, embodiments will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratios of each dimension are different from the actual ones. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, it goes without saying that parts having different dimensional relationships and ratios are included between the drawings.

Embodiment 1.
FIG. 1 is a block diagram schematically showing a configuration of a transmission / reception system according to the first embodiment of the present invention. In the present embodiment, the situation will be described in which the wireless transmission device 100 is installed in the train and the user (passenger) in the train has the receiving terminal 200. The receiving terminal 200 receives transmission data transmitted from a plurality of wireless transmission devices 100 installed in vehicles of trains in a plurality of areas.

In FIG. 1, the transmission / reception system 20 receives transmission data transmitted from a wireless transmission device 100 for transmitting transmission data and transmission data transmitted from the wireless transmission device 100, estimates the position of a reception terminal 200, and then provides vehicle operation guidance. A receiving terminal 200 for displaying is provided. Specifically, the receiving terminal 200 that receives the transmission data transmitted from the wireless transmission device 100 installed in the train vehicle estimates the position in the vehicle or vehicle in which the user is riding, and the user's position. Information related to train operation is displayed on the display unit 250 according to the above. The information related to train operation is, for example, train type information indicating a train type (ordinary, express, limited express, etc.), starting station information indicating a starting station, terminal station information indicating a terminal station, and the next stop station of a train. There is next station information indicating the next station, train position information indicating the position of the train, and door opening information indicating the door to be opened when the train is stopped. The display unit may be on a display provided in the receiving terminal 200.

First, the wireless transmission device 100 will be described. FIG. 2 is a diagram showing an installation example of a wireless transmission device 100 in a train car. FIG. 2 shows a state in which a wireless transmission device 100 (that is, wireless transmission devices 100a to 100j) is installed in front of and behind each vehicle of a 5-car train as an example. There is. The receiving terminal 200 receives transmission data transmitted from a plurality of wireless transmission devices 100a to 100j installed in a vehicle which is a plurality of areas. Both the No. 1 car side and the No. 5 car side of the train can be in front, but in the present embodiment, the No. 1 car side is the front. In the present embodiment, the number of wireless transmission devices installed in each vehicle will be described as two, but the number of wireless transmission devices may be three or more. The wireless transmission device 100 may be considered as a general term for the wireless transmission devices 100a to 100j. Further, each vehicle in which the wireless transmission device 100 is installed may be represented as an area. In FIG. 2, for example, car 1 is an area in which a wireless transmission device 100a and a wireless transmission device 100b are installed.

The wireless transmission device 100 generates transmission data and transmits the transmission data to the receiving terminal 200 at regular intervals. The transmission data generated by the wireless transmission device 100 includes device identification information for identifying the wireless transmission device 100, an identification number for identifying the installation position where the wireless transmission device 100 is installed (also referred to as a device identification number), and reception. The content information which is the information about the content provided to the terminal 200 is included. For example, when information such as a train destination is displayed on the display unit 250 of the receiving terminal 200, the transmission data includes information related to train operation as content information.

The content information may be represented as an arbitrary ID (IDentification). In this case, it is assumed that the correspondence between the content information and any ID is defined in advance as the first station information as "CI1" for "station A" and "CI2" for "station B". .. However, the format of the content information is not limited to this, and may be a numerical value or a text code.

The identification number is set to an arbitrary value indicating the installation position of the wireless transmission device 100 in the train car. In the present embodiment, an arbitrary value indicating the installation location of the wireless transmission device 100 in the vehicle and the car number of the installed vehicle is set as the identification number. An example of setting the identification number will be described. For example, if the installation location in the vehicle is "in front of the vehicle", the identification number is "odd", and if the installation location in the vehicle is "rear of the vehicle", the identification number is "even". When the identification number is an odd number, the car number of the vehicle on which the wireless transmission device 100 is installed is represented by an integer obtained by dividing the identification number by 2 and rounding up to the nearest whole number. When the identification number is an even number, the car number of the vehicle on which the wireless transmission device 100 is installed is represented by an integer obtained by dividing the identification number by 2.

FIG. 3 is a diagram showing an example of an identification number table of a wireless transmission device. FIG. 3 shows an identification number table showing an example of identification numbers corresponding to the wireless transmission device 100a to the wireless transmission device 100j. For example, in the case of the wireless transmission device 100f, the identification number is "6", the car number of the installed vehicle is "car 3", and the installation location in the vehicle is "rear". As the method for setting the identification number, any other setting method may be used as long as the vehicle number of the vehicle on which the wireless transmission device 100 is installed and an arbitrary value capable of indicating the installation position are set.

The wireless transmission device 100 may be connected to an information providing device (not shown) that transmits information to be included in the transmission data. For example, it may be connected by wire or wirelessly to an information providing device that transmits information about the train to the wireless transmission device 100. In this case, the wireless transmission device 100 receives information about the train from the information providing device at predetermined time intervals, generates transmission data each time, and transmits the transmission data to the receiving terminal 200. However, if it is not necessary to generate transmission data each time, the wireless transmission device 100 may repeatedly transmit the same transmission data to the receiving terminal 200 for a certain period of time without acquiring information from the information providing device. In this case, the wireless transmission device 100 is not connected to the information providing device.

The wireless transmission device 100 transmits transmission data using short-range wireless communication. For example, the standard for short-range wireless communication is BLE, which is Bluetooth® 4.0. In BLE, radio waves in the 2.4 GHz band are used. Further, the communication distance of BLE is a relatively narrow range from 2.5 m to 50 m. Therefore, the wireless transmission device 100 can transmit transmission data within a limited range. Further, the wireless transmission device 100 periodically transmits transmission data at predetermined intervals. According to the BLE standard, the transmission interval is between 20 ms (milliseconds) and 10.24 s (seconds). Therefore, the wireless transmission device 100 shall set the transmission interval of the transmission data within the range specified in the BLE standard. Further, the wireless transmission device 100 can set the transmission power of the transmission data in the range of −20 dBm to 10 dBm.

The device identification information is information unique to the wireless transmission device 100. The transmission data includes, as device identification information, a specific ID or a flag that can distinguish the wireless transmission device 100 from a smart terminal or wearable device that transmits / receives data by short-range wireless communication. The receiving terminal 200 identifies the transmission data transmitted from other than the desired wireless transmitting device 100 by the device identification information, and excludes the processing performed by the receiving terminal 200. As a result, it is possible to prevent erroneous estimation in the position estimation by the receiving terminal 200.

Next, the receiving terminal 200 will be described. The receiving terminal 200 includes a wireless receiving unit 210, a control unit 220, a transmission data information storage unit 230, a content storage unit 240, and a display unit 250. Of these, the control unit 220 includes a transmission data information analysis unit 221, a position estimation unit 223, and a content acquisition unit 224. The control unit 220 may be incorporated in the receiving terminal 200 from the beginning, or may be incorporated in the receiving terminal 200 as an application downloaded from the outside. In this case, a part of the internal memory in the receiving terminal 200 is allocated to the transmission data information storage unit 230 and the content storage unit 240.

The wireless reception unit 210 receives transmission data transmitted from a plurality of wireless transmission devices 100, and measures the received power when the transmission data is received. Further, the wireless reception unit 210 acquires the reception time of the transmission data. Since a plurality of wireless transmission devices 100 are installed, transmission data is received from the plurality of wireless transmission devices 100, the received power when the transmission data is received is measured, and the reception time of the transmission data is acquired. The wireless receiving unit 210 cannot receive a plurality of transmission data at one time. Therefore, for example, when the reception cycle is 100 ms, the wireless receiving unit 210 receives the transmission data transmitted from any of the wireless transmitting devices 100a to 100j every 100 ms. Further, the wireless receiving unit 210 may specify the number of transmission data that can be received per fixed time.

The wireless receiving unit 210 is not determined from which wireless transmitting device 100a to 100j the transmission data is received. Basically, the wireless receiving unit 210 receives the transmission data from the wireless transmitting device 100 installed at a position close to the receiving terminal 200. However, the wireless receiving unit 210 cannot receive the transmission data from the wireless transmitting device 100 installed at a position close to the receiving terminal 200, and receives the transmission data from the wireless transmitting device 100 installed at a position away from the receiving terminal 200. It may be received.

The wireless reception unit 210 sends the transmission data, the measured received power, and the reception time of the transmission data to the control unit 220. More specifically, the wireless reception unit 210 sends the transmission data to the transmission data information analysis unit 221 and sends the received power and the reception time to the position estimation unit 223. At this time, the wireless receiving unit 210 collates the identification number (device identification number) previously held in the receiving terminal 200 with the identification number included in the transmission data. As a result of collation, when the received transmission data is the transmission data received from a terminal other than the wireless transmission device 100, the wireless reception unit 210 does not send the transmission data, the reception power, and the reception time to the control unit 220. The process on the receiving terminal 200 is terminated.

The wireless receiving unit 210 receives transmission data in accordance with the standard of Bluetooth (registered trademark) 4.0. The receiving terminal 200 includes a wireless receiving unit 210 and is capable of short-range wireless communication. Specifically, a smartphone, a tablet terminal, or the like can be considered. When the user who owns the receiving terminal 200 enters the area where the wireless transmitting device 100 is installed, the wireless receiving unit 210 starts receiving the transmission data transmitted from the wireless transmitting device 100. For example, when the wireless transmission device 100 is installed in the train car, when the user gets on the vehicle in which the wireless transmission device 100 is installed, the reception of the transmission data is started.

The control unit 220 estimates the position of the receiving terminal 200 based on the transmission data acquired from the wireless receiving unit 210 and the received power, and acquires the content to be displayed on the display unit 250 of the receiving terminal 200 from the content storage unit 240. Then, the control unit 220 sends the content to the display unit 250.

The operation of the control unit 220 will be described in detail. When the transmission data information analysis unit 221 acquires the transmission data from the wireless reception unit 210, the transmission data information analysis unit 221 extracts the identification number and the content information from the transmission data. Then, the transmission data information analysis unit 221 sends the identification number to the position estimation unit 223 and the content information to the content acquisition unit 224. That is, the transmission data information analysis unit 221 acquires the transmission data from the wireless reception unit 210, and extracts the identification number that identifies the installation position of the wireless transmission device 100 from the transmission data.

The position estimation unit 223 sends the reception power and reception time acquired from the wireless reception unit 210 and the identification number acquired from the transmission data information analysis unit 221 to the transmission data information storage unit 230. The transmission data information storage unit 230 registers the identification number and the received power from the wireless transmission device 100 corresponding to the identification number in the received power table, and stores the received power table. Then, the position estimation unit 223 acquires the reception history of the received power data from the wireless transmission device 100 corresponding to each identification number from the received power table stored in the transmission data information storage unit 230, and then receives the receiving terminal. Estimate the position of 200. Then, the position estimation unit 223 sends the position estimation result to the content acquisition unit 224. The received power data includes the received power and the identification number corresponding to the received power. The received power table is a table of received power data received in time series.

The position estimation unit 223 acquires a predetermined number of received powers from the received power table to be described later stored in the transmission data information storage unit 230, and from the wireless transmission device 100 corresponding to the identification number based on the predetermined number of received powers. The received power integrated value is calculated, and the reception order is determined with respect to the identification number according to the magnitude of the received power integrated value. Then, the position of the receiving terminal 200 is estimated based on the reception order determined for each identification number and the installation position of the wireless transmission device 100 identified by the plurality of identification numbers. That is, the position estimation unit 223 estimates the position of the receiving terminal 200 based on the reception order of the identification number determined by the magnitude of the received power integrated value and the positional relationship of the wireless transmission device 100 identified by the identification number.

Prior to the detailed explanation of the position estimation unit 223, the transmission data information storage unit 230 will be described. The transmission data information storage unit 230 registers the identification number acquired from the position estimation unit 223 and the reception power and reception time from the wireless transmission device 100 corresponding to the identification number in the reception power table, and stores the reception power table.

FIG. 4 is a diagram showing an example of a received power table stored in the transmission data information storage unit 230. In FIG. 4, “No.” is a number of received power data registered in the transmission data information storage unit 230. In FIG. 4, No. No. 5 to No. Notation is omitted for the received power data up to m-1. In the received power table, the received power from the wireless transmission device 100 corresponding to the identification number acquired by the transmission data information storage unit 230 is registered. In the received power table, the received power data to be registered is represented as "received power (identification number)". For example, the received power "0.0001 (mW)" is represented by a decimal index such as "1.0E-4 (mW)". When the transmission data information storage unit 230 acquires "5" as the identification number and "1.0E-4 (mW)" as the reception power, the transmission data information storage unit 230 stores the reception power data "1. 0E-4 (5) ”will be registered.

The transmission data information storage unit 230 registers the received power data from the wireless transmission device 100 corresponding to the identification number for which the received power data has not been acquired as "0". A symbol other than "0" may be used as long as it indicates that the identification number has not been acquired. Further, when a weak received power that cannot be used for position estimation is received, the received power data is registered as "0".

In FIG. 4, the received power data whose received power data number is “No. 1” is [0 (1), 0 (2), 6.5E-7 (3), 3.2E-5 (4), 2.3E-4 (5), 3.8E-5 (6), 0 (7), 0 (8), 3.2E-9 (9), 0 (10)] will be registered.

The position estimation unit 223 estimates the position using the reception history of a predetermined number of received power data registered in the transmission data information storage unit 230. That is, since it is only necessary to register the received power data as much as necessary for position estimation, the transmission data information storage unit 230 may set the number of registerable data of the received power data to be registered in the received power table. A case where the received power data from the wireless transmission device 100 corresponding to the identification number acquired by the position estimation unit 223 reaches the number of registerable data will be described, where the number of registerable data is set to a predetermined number m (No. m in FIG. 4). do. When the received power data reaches the number of registerable data m, the transmission data information storage unit 230 uses the oldest registered received power data (No. 1 in FIG. 4 in ascending order, No. 1 in FIG. 4 in descending order). After deleting .m), new received power data is registered in the received power table (No. m in FIG. 4 in ascending order, No. 1 in FIG. 4 in descending order). At this time, the transmission data information storage unit 230 updates No except for the received power data deleted in the received power table (No = No-1 in FIG. 4 in ascending order, No = No + 1 in FIG. 4 in descending order). ).

When the number of registerable data is not set in the received power table, the transmission data information storage unit 230 adds the registration of the received power data to the received power table each time the identification number and the received power are acquired. become.

FIG. 5 is a diagram showing an example of a reception time table stored in the transmission data information storage unit 230. The transmission data information storage unit 230 registers the reception time at which the reception power data is acquired for each identification number in the reception time table. In the reception time table, the reception time data to be registered is represented as the reception time (identification number). For example, when the transmission data information storage unit 230 acquires "5" as the identification number and "8: 54: 55.400 (hour: minute: second)" as the reception time, the transmission data information storage unit 230 receives the reception time. The reception time data 8: 54: 55.400 (5) will be registered in the table. The transmission data information storage unit 230 registers the reception time from the wireless transmission device 100 corresponding to the identification number for which the reception power data has never been acquired as "0". Here, the format of the reception time registered in the reception time table is not limited to this.

The transmission data information storage unit 230 clears the target received power data registered in the received power table for the identification number for which the received power data could not be acquired even after a certain period of time has elapsed. The transmission data information storage unit 230 takes a difference between the reception time acquired by the transmission data information storage unit 230 and the reception time registered in the reception time table, and if the difference time exceeds a certain time, the target is Clear only the received power data. For example, when the fixed time for clearing the received power data is set to "10 seconds" and the transmission data information storage unit 230 acquires "8: 54: 55.000" as the reception time, the identification number "8:54:55.000" is shown in FIG. It can be seen that in "3" and the identification number "4", it has exceeded 10 seconds or more since the received power data was last acquired. Therefore, the transmission data information storage unit 230 clears the received power corresponding to the identification number “3” and the received power corresponding to the identification number “4” registered in the reception power table.

The explanation returns to the explanation about the position estimation unit 223. Each time the position estimation unit 223 acquires the identification number and the received power from the transmission data information analysis unit 221, the position estimation unit 223 acquires a predetermined number of received powers from the transmission data information storage unit 230 in order to estimate the position, and obtains a predetermined number of received powers. Calculate the integrated received power value, which is the sum of the received power. In the present embodiment, the received power may be described as a received power integrated value.

The received power may fluctuate greatly depending on the environment around the area where the user who owns the receiving terminal 200 is staying. Therefore, the purpose of using the received power integrated value for the position estimation in the position estimation unit 223 is to calculate the received power integrated value from the wireless receiving unit 100 installed in the area where the user is not staying. This is to suppress the influence of the received power when the 210 receives the transmission data on the position estimation.

FIG. 6 is a diagram showing an example of a received power table comparing the average value and the integrated value of the received power. FIG. 6 shows the received power acquired by the wireless receiving unit 210 while the user is staying in the area where the wireless transmitting device 100a corresponding to the identification number 1 is installed, where the number of data that can be registered in FIG. 4 is 10. Shows. In FIG. 6, it can be seen that only the received power corresponding to the identification number 1, the received power corresponding to the identification number 2, and the received power corresponding to the identification number 5 are registered. Further, FIG. 6 further shows the average value of the received power calculated for each identification number and the integrated value of the received power.

The average value in FIG. 6 is defined as "mean value = total received power / number of received power received", and the number of received power received is the number of received power whose received power is not zero. For example, from FIG. 6, when the identification number is 2, the received power is not 0 and the number of received numbers is 4, so the average value is "((3.2E-5) + (3.3E-4) + (3). .2E-5) + (3.1E-5)) / 4 = 1.06E-4 ". The integrated value in FIG. 6 is the sum of the received power and is the integrated value of the received power. For example, from FIG. 6, when the identification number is 2, the integrated value is "(3.2E-5) + (3.3E-4) + (3.2E-5) + (3.1E-5) = 4". .25E-4 ".

As shown in FIG. 6, the number of times the transmission data transmitted from the identification number 5 is received is the least once, but the received power is a relatively strong received power such as "2.5E-4". As described above, even when the transmission data is received from the wireless transmission device 100 installed in the area where the user is not staying, the received power may be relatively strong. In this case, the average is larger in the order of identification number 5, identification number 1, and identification number 2. That is, the average value of the received power of the transmission data transmitted from the wireless transmission device 100e installed in the area where the user is not staying is the largest. On the other hand, since the integrated value is larger in the order of identification number 1, identification number 2, and identification number 5, the total received power of the transmission data transmitted from the wireless transmission device 100a installed in the area where the user is staying is the sum. It is the largest and has the desired result. For this reason, the position estimation unit 223 uses the received power integrated value, which is the sum of the received powers, for the position estimation.

The position estimation unit 223 acquires received power data from the transmission data information storage unit 230 for the number of data required for position estimation, and acquires the received power integrated value from the wireless transmission device 100 corresponding to the identification number for each identification number. .. In the receiving terminal 200, after the transmission data reception is started, the position cannot be estimated until a certain time elapses. Therefore, the receiving terminal 200 does not estimate the position, and the processing in the receiving terminal 200 ends.

The position estimation unit 223 acquires received power data from the transmission data information storage unit 230 for the number of data required for position estimation. For example, the number of received power data required for position estimation is "50", and No. 4 in FIG. When m is set to "m = 50", the received power data acquired by the position estimation unit 223 is described as [[Received power 1 (identification number 1), ..., Received power 10 (identification number 10)] No. 1, ..., [Received power 1 (identification number 1), ..., Received power 10 (identification number 10)] No. 50].

From the received power table as shown in FIG. 4, [[0 (1), 0 (2), 6.5E-7 (3), 3.2E-5 (4), 2.3E-4 (5), 3 .8E-5 (6), 0 (7), 0 (8), 2.0E-8 (9), 0 (10)] 1, [[0 (1), 0 (2), 0 (3) , 3.4E-5 (4), 2.3E-4 (5), 4.5E-6 (6), 0 (7), 0 (8), 2.0E-8 (9), 0 (10) )] 2, ..., [[0 (1), 0 (2), 0 (3), 0 (4), 2.5E-4 (5), 3.7E-5 (6), 0 (7) , 0 (8), 0 (9), 0 (10)] 50] to acquire the received power data.

Then, the position estimation unit 223 calculates the received power integrated value for each identification number. It is assumed that the received power integrated value for each identification number is expressed as [integrated value 1 (identification number 1), ..., Integrated value 10 (identification number 10)]. In the case of FIG. 4, the position estimation unit 223 is [0 (1), 0 (2), 6.5E-7 (3), 9.7E-5 (4), 2.34E-3 (5), 3 .05E-4 (6), 0 (7), 0 (8), 2.63E-8 (9), 0 (10)] to acquire the received power integrated value for each identification number.

Here, when the user who possesses the receiving terminal 200 is in the vehicle, the received power integrated value when the receiving terminal 200 receives the transmission data from the wireless transmission devices 100a to 100j will be described. FIG. 7 is a graph showing the time change of the received power integrated value. In FIG. 7, the vertical axis is the received power integrated value (unit: mW), and the horizontal axis is the elapsed time (unit: sec). FIG. 7A is obtained after a user having a receiving terminal 200 in a train car gets on the vicinity of the wireless transmitting device 100e in front of the vehicle No. 3 in which two wireless transmitting devices 100 are installed. It is a figure which showed the received power integrated value. FIG. 7B is a diagram showing the received power integrated value acquired after the user possessing the receiving terminal 200 gets in front of the vehicle No. 4 in which the wireless transmitting device 100 is not installed. In FIGS. 7 (a) and 7 (b), the position of the receiving terminal 200 has not changed after the user got on board.

In FIG. 7, when the integrated value of the received power received from the wireless transmission devices 100a to 100j is “0”, that is, when the receiving terminal 200 does not receive the transmission data including the corresponding identification number, it is illustrated in the graph. Not. In FIG. 7, for example, the line indicated by 100e (5) shows the time change of the received power integrated value of the wireless transmission device 100e having the identification number 5. In FIGS. 7 (a) and 7 (b), the integrated received power value increases with the passage of time up to a certain time.

In FIG. 7A, when the elapsed time t2 has elapsed since the user possessing the receiving terminal 200 got in front of the vehicle No. 3, a plurality of received power integrations acquired in the area where the wireless transmission device 100 is installed are integrated. The integrated value of the received power from the wireless transmission device 100e having the largest value always exceeds the value v1. The elapsed time t2 is set as the time when the maximum received power integrated value exceeds the predetermined threshold value v1.

The position estimation unit 223 sets a predetermined threshold value in order to distinguish between the area where the wireless transmission device 100 is installed and the area where the wireless transmission device 100 is not installed or the wireless transmission device 100 is out of order. do. Here, the predetermined threshold value is a value v1 in which the largest received power integrated value among the plurality of received power integrated values acquired in the area where the wireless transmission device 100 is installed always exceeds the elapsed time t2 or later. Here, the position is not estimated until the elapsed time t2, which is a fixed time, is reached after the reception of the transmission data is started, and the processing at the receiving terminal 200 ends.

On the other hand, in FIG. 7B, even after a while from the elapsed time t2 after the user having the receiving terminal 200 got on the front of the vehicle No. 4, the acquisition was obtained in the area where the wireless transmission device 100 is not installed. The plurality of received power integrated values do not exceed the value v1. Due to the tendency of the integrated received power value to increase with respect to the elapsed time, the position estimation unit 223 has an area where the wireless transmission device 100 is installed and the wireless transmission device 100 is not installed, or the wireless transmission device 100 fails. It is possible to distinguish it from the area where it is located.

The transmission data information storage unit 230 sets a predetermined number of m as the number of registerable data to be registered in the received power table, and the received power data from the wireless transmission device 100 corresponding to the identification number acquired by the position estimation unit 223 is stored. When the number of registerable data is reached, the oldest registered received power data is deleted, and then new received power data is registered in the received power table. Therefore, after a while from the elapsed time t2, the received power integrated value is saturated.

The position estimation unit 223 is in an area where the receiving terminal 200 is present in the area where the wireless transmission device 100 is installed, or the wireless transmission device 100 is not installed, or the wireless transmission device 100 is out of order. It is estimated whether the receiving terminal 200 exists. Then, the position estimation unit 223 further estimates the area where the receiving terminal 200 exists and the position within the area.

In this embodiment, two wireless transmission devices 100 are installed in one vehicle. Therefore, normally, it is assumed that the received power integrated value of the identification numbers set in the two wireless transmission devices 100 installed in the same vehicle becomes larger than the predetermined threshold value. However, if there is a vehicle in which the wireless transmission device 100 cannot be installed due to the layout of the equipment in the vehicle, or if the wireless transmission device 100 is out of order, it is not possible to obtain a received power integrated value larger than a predetermined threshold value. ..

Therefore, the position estimation unit 223 determines the reception order with respect to the identification number according to the size of the received power integrated value. Then, the position of the receiving terminal 200 is estimated based on the reception order determined for each identification number and the installation position of the wireless transmission device 100 identified by the identification number. The position estimation unit 223 changes the area where the receiving terminal 200 exists and the number of identification numbers used for position estimation in the area based on the reception order of the plurality of identification numbers and the installation position of the wireless transmission device 100. The position of the receiving terminal 200 is estimated based on the positional relationship within the installation area of the wireless transmission device 100 for the number of transmitted transmission data including the identification number used for the position estimation.

Further, the position estimation unit 223 is a receiving terminal from among a plurality of identification numbers corresponding to the plurality of received power integrated values based on the presence or absence of a received power integrated value larger than a predetermined threshold value among the plurality of received power integrated values. Determine the number of identification numbers used for position estimation. When the integrated value of the received power from the wireless transmission device 100 corresponding to the identification number having the first reception order is larger than a predetermined threshold value, the position estimation unit 223 sets the number of identification numbers used for position estimation to one. do. Further, when the integrated value of the received power from the wireless transmission device 100 corresponding to the identification number having the first reception order is equal to or less than a predetermined threshold value, the position estimation unit 223 sets the number of identification numbers used for position estimation to 2. More than one.

8 to 10 are diagrams showing an example of the calculation result of the received power integrated value for each identification number. 8 to 10, FIG. 10A is a diagram showing the arrangement of the wireless transmission devices 100a to 100j in the train car and the position p1 where the receiving terminal 200 is present. The target train is the same as in FIG. The wireless transmission device 100a (1) indicates a wireless transmission device 100a having an identification number of 1. The wireless transmission device 100 corresponding to the identification number used for position estimation is shown by a square filled with black. FIG. (B) is a diagram showing the reception order and the installation area of the received power integrated values calculated by each of the wireless transmission devices 100a to 100j (corresponding to the identification numbers 1 to 10) described with reference to FIG. be. A circle in the reception order number indicates that the received power integrated value exceeds a predetermined threshold value.

FIG. 8 shows the reception order of the received power integrated value for each identification number calculated when the user who possesses the receiving terminal 200 gets on the front of the vehicle in the No. 3 car. FIG. 9 shows the receiving terminal 200 when the wireless transmission devices 100g and 100h are not installed at the positions where the wireless transmission devices 100g and 100h should be installed, or when the wireless transmission devices 100g and 100h are out of order. It shows the reception order of the received power integrated value for each identification number calculated when the possessed user moves to the front of the vehicle in the No. 4 car. FIG. 10 shows the receiving terminal 200 when the wireless transmission devices 100g and 100h are not installed at the positions where the wireless transmission devices 100g and 100h should be installed, or when the wireless transmission devices 100g and 100h are out of order. It shows the reception order of the received power integrated value for each identification number calculated when the possessed user moves to the rear of the vehicle in the No. 4 car.

The estimation of the position where the receiving terminal 200 exists will be described while adding the explanation of the specific example of the receiving order of the received power integrated values shown in FIGS. 8 to 10. The position estimation unit 223 estimates the position of the receiving terminal based on the fact that the wireless transmission devices for the number of identification numbers used for the position estimation of the receiving terminal 200 are installed in the adjacent areas.

First, a case where there is a received power integrated value larger than a predetermined threshold value among a plurality of received power integrated values will be described. When the position estimation unit 223 has a received power integrated value larger than a predetermined threshold value, the position estimation unit 223 estimates that the area where the receiving terminal 200 owned by the user exists is the installation area of the wireless transmission device 100. Then, the position estimation unit 223 selects the maximum received power integrated value, and estimates that the vicinity of the wireless transmission device 100 of the identification number corresponding to the selected received power integrated value is the position where the receiving terminal 200 exists. That is, when there is a received power integrated value larger than a predetermined threshold value among a plurality of received power integrated values, the position estimation unit 223 identifies by the identification number in which the reception order in which the received power integrated value is the first is the first. The position of the receiving terminal 200 is estimated based on the installation position of the wireless transmission device 100.

The position estimation unit 223 has two received power integrated values larger than a predetermined threshold value, and when the two received power integrated values match, or when the difference between the two received power integrated values is a certain value or less. It is estimated that the position where the receiving terminal 200 is located is in the center of the area.

A specific example of such position estimation will be described with reference to FIG. As shown in FIG. 8A, the position p1 where the receiving terminal 200 is located is in front of the vehicle No. 3. As shown in FIG. 8B, the received power integrated value larger than the predetermined threshold value at the position p1 is the received power integrated value of the identification number 5. Therefore, the reception order of the identification number 5 determined by the magnitude of the received power integrated value is the first. Further, the identification number 5 of the received power integrated value larger than the predetermined threshold value corresponds to the wireless transmission device 100e. From this, the position estimation unit 223 estimates that the area (first area) in which the receiving terminal 200 exists is the "car No. 3". Since the integrated received power value of the identification number 5 is maximized at the position p1, the position estimation unit 223 estimates that the position of the receiving terminal 200 owned by the user is "near the wireless transmission device 100e" having the identification number 5. do.

Next, a case where there is no received power integrated value larger than a predetermined threshold value among a plurality of received power integrated values will be described. When there is no received power integrated value larger than a predetermined threshold value, and two wireless transmission devices that transmit transmission data including identification numbers corresponding to the top two received power integrated values are installed in different areas. Will be explained. The position estimation unit 223 is an identification number of the wireless transmission device 100 installed in an area where there is no received power integrated value larger than a predetermined threshold value and the identification numbers corresponding to the top two received power integrated values are different. In this case, the top two received power integrated values are used to compare the positions of the areas where the wireless transmission device 100, which is the corresponding identification number, is installed.

The position estimation unit 223 sets the area in which the wireless transmission device 100 that has transmitted the transmission data including the identification number having the highest received power integrated value and the first highest reception order is installed as the first area. The position estimation unit 223 uses the area in which the wireless transmission device 100 that has transmitted the transmission data including the identification number having the second highest reception power integrated value as the second highest reception order is installed as the second area.

When the first area is not adjacent to the second area, the position estimation unit 223 estimates that the area where the receiving terminal 200 is located is the area adjacent to the first area. Here, the adjacent area means the second area side (the area between the first area and the second area). Then, the position estimation unit 223 estimates that the position near the wireless transmission device 100 installed on the first area side in the adjacent area is the position where the receiving terminal 200 exists. That is, when there is no received power integrated value larger than a predetermined threshold value among the plurality of received power integrated values, the position estimation unit 223 is the installation position of the wireless transmission device 100 identified by the identification number having the first reception order. The position of the receiving terminal 200 is estimated based on the installation position of the wireless transmission device 100 identified by the identification number having the second highest reception order. Although the order of arrangement of the areas will be described in the present embodiment, the order of arrangement may be either from the front of the vehicle or from the rear of the vehicle. Further, even if the order of arranging is reversed, the position where the receiving terminal 200 exists can be estimated in the same manner.

A specific example of such position estimation will be described with reference to FIG. As shown in FIG. 9A, the position p1 where the receiving terminal 200 is located is in front of the vehicle No. 4. As shown in FIG. 9B, there is no received power integrated value larger than a predetermined threshold value at position p1. The wireless transmission device 100b corresponding to the identification number 6 having the highest reception order with the highest integrated received power value is installed in the third car (first area). The wireless transmission device 100i corresponding to the identification number 9 having the second highest reception power integrated value is installed in the fifth car (second area). From this, the position estimation unit 223 estimates that the area where the receiving terminal 200 is located is the "car No. 4". At the position p1, the wireless transmission device 100f corresponding to the identification number 6 having the highest reception power integrated value and the first highest reception order is installed in the third car, so that the position estimation unit 223 has the receiving terminal 200. It is estimated that the existing position is "around 100 g of the wireless transmission device".

Next, another example in the case where there is no received power integrated value larger than a predetermined threshold value among a plurality of received power integrated values will be described. A case where there is no received power integrated value larger than a predetermined threshold value and two wireless transmission devices that transmit transmission data including identification numbers corresponding to the upper two received power integrated values are installed in the same area will be described. .. The position estimation unit 223 receives when there is no received power integrated value larger than a predetermined threshold value and the identification numbers corresponding to the upper two received power integrated values are the identification numbers of the wireless transmission devices 100 installed in the same area. The top three power integrated values are used to compare the positions of the areas where the wireless transmitter 100, which is the corresponding identification number, is installed.

The position estimation unit 223 includes a wireless transmission device 100 that transmits transmission data including an identification number having the first reception order and a wireless transmission device that transmits transmission data including an identification number having the second highest reception order. The area where 100 is installed is referred to as the first area. The position estimation unit 223 sets the area in which the wireless transmission device 100 that has transmitted the transmission data including the identification number having the third highest reception order is installed as the second area.

When the first area is not adjacent to the second area, the position estimation unit 223 estimates that the area where the receiving terminal 200 is located is the area adjacent to the first area. Here, the adjacent area means the second area side (the area between the first area and the second area). Then, the position estimation unit 223 estimates that the position near the wireless transmission device 100 installed on the first area side in the adjacent area is the position where the receiving terminal 200 exists. That is, when there is no received power integrated value larger than a predetermined threshold value among the plurality of received power integrated values, the position estimation unit 223 is the installation position of the wireless transmission device 100 identified by the identification number having the first reception order. Receiving based on the installation position of the wireless transmission device 100 identified by the identification number having the second highest reception order and the installation position of the wireless transmission device 100 identified by the identification number having the third highest reception order. Estimate the position of the terminal 200.

A specific example of such position estimation will be described with reference to FIG. As shown in FIG. 10A, the position p1 where the receiving terminal 200 is located is behind the vehicle of the No. 4 car. As shown in FIG. 10B, there is no received power integrated value larger than a predetermined threshold value at position p1. The wireless transmission device 100i corresponding to the identification number 9 having the highest received power integrated value and the second highest receiving power integrated value corresponds to the identification number 10 having the second highest received power integrated value. The wireless transmission device 100j is installed in car No. 5 (first area). The wireless transmission device 100f corresponding to the identification number 6 having the third highest reception power integrated value and the third highest reception order is installed in the third car (second area). From this, the position estimation unit 223 estimates that the area where the receiving terminal 200 is located is the "car No. 4". In the position p1, the wireless transmission device 100i corresponding to the identification number 9 having the highest reception order with the highest received power integrated value is installed in the car No. 5, so that the position estimation unit 223 has the receiving terminal 200. It is estimated that the existing position is "near 100h of the wireless transmission device".

As described above, by performing the above processing in the position estimation unit 223, even if any of the wireless transmission devices 100 is out of order or the wireless transmission device 100 is not installed, the receiving terminal 200 can be used. The user's position can be estimated from the received transmission data.

Returning to the explanation of the block diagram of FIG. The position estimation unit 223 sets in advance a certain period for determining whether to send the position estimation result to the content acquisition unit 224. In the present embodiment, the position estimation unit 223 sends the position estimation result to the content acquisition unit 224 within the train stop time. However, the position estimation unit 223 changes this fixed period according to the application destination of the transmission / reception system 20.

When the content acquisition unit 224 acquires the position estimation result from the position estimation unit 223, the content acquisition unit 224 displays the content information acquired from the transmission data information analysis unit 221 and the content acquired from the content storage unit 240 based on the position estimation result. Send to 250.

The content storage unit 240 stores the content displayed by the display unit 250. FIG. 11 shows an example of a content table stored in the content storage unit 240. The content table shows the correspondence between the content information and the position for the content. From FIG. 11, for example, the content corresponding to the content information "CI1" and the position "P2" is "C2". Further, the content is text information, a still image, a moving image, a voice, or a combination thereof.

The display unit 250 is an output interface for the content acquired from the content acquisition unit 224, and displays the content based on the position of the receiving terminal 200 and the content information included in the transmission data. FIG. 12 shows an example of the content displayed on the display unit 250. Content according to the user's position is displayed on the display unit 250. For example, when the wireless transmission device 100 is installed near the priority seat of the vehicle, the display unit 250 of the receiving terminal located at a position away from the priority seat of the first car has a screen as shown in FIG. 12 (a). Is displayed. On the other hand, in the vicinity of the priority seat of car 1, the display unit 250 displays a display with precautions in the vicinity of the priority seat, such as "Please switch to silent mode" as shown in FIG. 12 (b). Will be done.

Next, the operation of each device of the transmission / reception system 20 according to the present embodiment will be described. First, the wireless transmission device 100 installed in each vehicle transmits transmission data at regular intervals after the power is turned on. However, the wireless transmission device 100 and an external terminal (not shown) may be connected, a transmission data transmission start instruction may be received from the external terminal, and transmission data transmission may be started. The transmission power of the transmission data in the wireless transmission device 100 is set so that the receiving terminal 200 can receive the transmission data of the wireless transmission device 100 installed in the vehicle. For example, the transmission power of the wireless transmission device 100a installed in the car No. 1 and the transmission power of the wireless transmission device 100b are the transmission data transmitted from the wireless transmission device 100a by the receiving terminal 200 existing in the car No. 1 and the wireless transmission device 100b. The transmission power is set so that the transmission data transmitted from is receivable.

The wireless transmission device 100 generates transmission data and transmits the transmission data to the receiving terminal 200. At this time, the wireless transmission device 100 determines the identification number included in the transmission data based on the correspondence between the wireless transmission device 100 and the identification number, and then generates the transmission data. When the wireless transmission device 100 is connected to an information providing device (not shown), the wireless transmission device 100 newly generates transmission data each time information is acquired from the information providing device. When the wireless transmission device 100 is not connected to the information providing device, transmission data is generated immediately after the wireless transmission device 100 is activated or after an instruction from an external terminal. In this case, the information contained in the transmission data does not change. Further, the identification number included in the transmission data is set in advance for each installation position of the wireless transmission device 100.

Here, the operation of the receiving terminal 200 will be described with reference to a flowchart. FIG. 13 is a flowchart showing a process executed by the receiving terminal 200. The wireless reception unit 210 receives the transmission data (step S101), acquires the reception time which is the time when the transmission data is received (step S102), and measures the reception power at the time of receiving the transmission data (step S103). Here, when the identification number (device identification number) of the wireless transmission device 100 held in advance by the receiving terminal 200 and the identification number of the wireless transmission device 100 included in the transmission data match (YES in step S104). The process proceeds to step S105. When the identification number of the wireless transmission device 100 held in advance by the receiving terminal 200 and the identification number included in the transmission data do not match (NO in step S104), the process in the receiving terminal 200 ends.

The transmission data information analysis unit 221 acquires the identification number and the content information included in the transmission data acquired from the wireless reception unit 210 (step S105). The position estimation unit 223 sets a threshold value v1 (step S106). Then, the position estimation unit 223 registers the identification number, the received power, and the received time in the received power table, and stores the received power table in the transmission data information storage unit 230 (step S107). Here, if the identification number and the received power are not registered in the received power table of the transmission data information storage unit 230 even after a certain period of time has elapsed (YES in step S108), the process proceeds to step S109. If the identification number and the received power are registered within a certain period of time in the received power table of the transmission data information storage unit 230 (NO in step S108), the process proceeds to step S111. If YES in step S108, the process proceeds to step S109, and the transmission data information storage unit 230 clears the received power corresponding to the identification number that has not been registered even after a certain period of time has elapsed (step S109).

If the elapsed time t2, which is a fixed time from the start of receiving the transmission data, has elapsed (YES in step S110), the process proceeds to step S111. If the elapsed time t2, which is a fixed time from the start of receiving the transmission data, has not elapsed (NO in step S110), the position estimation unit 223 does not estimate the position and ends the process in the receiving terminal 200. ..

The position estimation unit 223 calculates the integrated value of the received power from the wireless transmission device 100 corresponding to the identification number based on a predetermined number of received powers, and determines the reception order with respect to the identification number according to the magnitude of the integrated received power value. do. Then, the position estimation unit 223 estimates the position of the receiving terminal 200 based on the reception order determined for each identification number and the installation position of the wireless transmission device identified by the identification number (step S111).

The content acquisition unit 224 acquires content from the content storage unit 240 based on the content information acquired from the transmission data information analysis unit 221 and the position estimation result acquired from the position estimation unit 223 (step S112). Then, the display unit 250 displays the content acquired by the content acquisition unit 224 (step S113).

Here, the details of the processing of step S111 in the position estimation unit 223 will be described with reference to a flowchart. FIG. 14 is a flowchart showing a position estimation process executed by the receiving terminal. The position estimation unit 223 calculates the received power integrated value for each identification number in the received power acquired from the transmission data information storage unit 230 (step S201). Here, if there is a received power integrated value larger than a predetermined threshold value (YES in step S202), the process proceeds to step S203. If there is no received power integrated value larger than a predetermined threshold value (NO in step S202), the process proceeds to step S205.

If YES is determined in step S202, the position estimation unit 223 determines that the number of identification numbers used for position estimation of the receiving terminal 200 is one, and the upper one (received power) having the maximum received power integrated value. It is decided to use the received power integrated value (the reception order of the integrated value is the first) (step S203). Then, the process proceeds to step S204, and the position estimation unit 223 acquires the area where the receiving terminal 200 exists and the position where the receiving terminal 200 exists (step S204), and ends the position estimation process.

When the wireless transmission device 100 that is determined to be NO in step S202 and transmits transmission data including the identification numbers corresponding to the upper two received power integrated values is installed in a different area (YES in step S205), step S206. Proceed to the process of. When the wireless transmission device 100 that is determined to be NO in step S202 and transmits transmission data including the identification numbers corresponding to the upper two received power integrated values is installed in the same area (NO in step S205), step S208. Proceed to.

If YES is determined in step S205, the position estimation unit 223 determines that the number of identification numbers used for position estimation of the receiving terminal 200 is two, and the received power integrated value is the upper two received power integrated values ( It is decided to use the reception order of the received power integrated value (first and second) (step S206). Proceeding to the process of step S207, the position estimation unit 223 compares the positional relationship of the installation area of the wireless transmission device 100 that has transmitted the transmission data including the identification numbers corresponding to the upper two received power integrated values (step S207). ). Then, the position estimation unit 223 acquires the area where the receiving terminal 200 exists and the position where the receiving terminal 200 exists (step S204), and ends the position estimation process.

If NO is determined in step S205, the position estimation unit 223 determines that the number of identification numbers used for position estimation of the receiving terminal 200 is 3, and the received power integrated value is the upper 3 received power integrated values ( It is decided to use the reception order of the received power integrated value (1st, 2nd, and 3rd) (step S208). Proceeding to the process of step S207, the position estimation unit 223 compares the positional relationship of the installation area of the wireless transmission device 100 that has transmitted the transmission data including the identification numbers corresponding to the upper three received power integrated values (step S207). ). Then, the position estimation unit 223 acquires the area where the receiving terminal 200 exists and the position where the receiving terminal 200 exists (step S204), and ends the position estimation process.

As described above, according to the transmission / reception system according to the first embodiment, the reception terminal owned by the user even when the wireless transmission device 100 is not installed or the wireless transmission device 100 is out of order. 200 positions can be estimated. If the installation area and position of the wireless transmission device 100 corresponding to the identification number that maximizes the reception power of the transmission data received by the receiving terminal 200 is used as the position estimation result, the wireless transmission device 100 is not installed or wirelessly. If the transmission device 100 is out of order, it is presumed that the user is in a vehicle that is not in the vehicle. In the transmission / reception system according to the present embodiment, by comparing the positional relationship of the wireless transmission device 100 that has transmitted the transmission data, the position of the reception terminal 200 possessed by the user can be accurately estimated even in the above case.

In addition, it is possible to provide information according to the user's position based on the position estimation result. For example, in a train car, the priority seat can be alerted only to the user who is staying near the priority seat. It can also provide a route from the nearest door at the station where you get off.

In this embodiment, for the sake of easy understanding, the explanation has been limited to train cars, but it can be applied even in a situation where a plurality of areas are arranged so as to be adjacent to each other in a row. Yes, the same effect can be expected.

Further, although the embodiments of the present invention have been described as described above, the present invention is not limited to these embodiments.

Embodiment 2.
FIG. 15 is a block diagram schematically showing a configuration of a transmission / reception system according to a second embodiment for carrying out the present invention. In FIG. 15, the receiving terminal 200 includes a wireless receiving unit 210, a control unit 220, a transmission data information storage unit 230, a content storage unit 240, and a display unit 250. Of these, the control unit 220 includes a transmission data information analysis unit 221, a threshold value change unit 222, a position estimation unit 223, and a content acquisition unit 224. The control unit 220 may be incorporated in the receiving terminal 200 from the beginning, or may be incorporated in the receiving terminal 200 as an application downloaded from the outside. In this case, a part of the internal memory in the receiving terminal 200 is allocated to the transmission data information storage unit 230 and the content storage unit 240. The present embodiment is different from the first embodiment in that the receiving terminal 200 is provided with the threshold value changing unit 222, and the other configurations are the same as those of the first embodiment. Therefore, the differences from the first embodiment will be described.

The wireless reception unit 210 sends the transmission data, the measured received power, and the reception time of the transmission data to the control unit 220. More specifically, the wireless reception unit 210 sends the transmission data to the transmission data information analysis unit 221, sends the reception time to the threshold value change unit 222, and sends the reception power and the reception time to the position estimation unit 223. At this time, the wireless receiving unit 210 collates the identification number (device identification number) previously held in the receiving terminal 200 with the identification number included in the transmission data. As a result of collation, when the received transmission data is the transmission data received from a terminal other than the wireless transmission device 100, the wireless reception unit 210 does not send the transmission data, the reception power, and the reception time to the control unit 220. The process on the receiving terminal 200 is terminated.

The position estimation unit 223 sends the reception power and reception time acquired from the wireless reception unit 210 and the identification number acquired from the transmission data information analysis unit 221 to the transmission data information storage unit 230. Then, after acquiring the reception history of the received power data from the wireless transmission device 100 corresponding to each identification number registered in the transmission data information storage unit 230, reception is performed using the threshold value acquired from the threshold value change unit 222. The position of the terminal 200 is estimated, and the position estimation result is sent to the content acquisition unit 224.

The position estimation unit 223 sets a predetermined threshold value in order to distinguish between the area where the wireless transmission device 100 is installed and the area where the wireless transmission device 100 is not installed or the wireless transmission device 100 is out of order. The threshold value set by the position estimation unit 223 is a threshold value acquired from the threshold value change unit 222, and the threshold value change unit 222 will be described.

The threshold value changing unit 222 changes the threshold value used for position estimation by the position estimation unit 223 according to the elapsed time calculated based on the reception time of the transmission data acquired from the wireless reception unit 210. Then, the threshold value changing unit 222 sends the changed threshold value to the position estimation unit 223. The threshold value changing unit 222 stores the reception time when the wireless receiving unit 210 starts receiving the transmission data (that is, the reception time acquired for the first time by the threshold value changing unit 222 and is used as the initial time), and thereafter, the threshold value is changed. The elapsed time is calculated by taking the difference between the reception time acquired by the unit 222 and the initial time.

Then, the threshold value changing unit 222 changes the threshold value according to the elapsed time. In the present embodiment, when the elapsed time t1 is reached, the threshold value is changed to the first threshold value, and when the elapsed time t2 is reached, the threshold value is changed from the first threshold value to the second threshold value. explain. The elapsed time t1 is set as a time after the initial time. Further, the elapsed time t2 is set as a time when the maximum received power integrated value exceeds the threshold value v1.

Here, the threshold value changing unit 222 sends a value indicating that the threshold value is invalid to the position estimation unit 223 from the initial time to the elapsed time t1. The fact that the threshold value is invalid means that there is no big difference between the plurality of received power integrated values, the area where the wireless transmission device 100 is installed and the wireless transmission device 100 are not installed, or the wireless transmission device 100 fails. It means that the area where the area is located cannot be distinguished. Since the received power integrated value (mW) is always a positive value, for example, the value indicating that the threshold value is invalid may be "-1", which is a negative value, but the value is called an invalid value as the threshold value. Is defined by other values, and is not limited to this if it is clear.

The threshold value changed by the threshold value changing unit 222 can distinguish between an area in which the wireless transmission device 100 is installed and an area in which the wireless transmission device 100 is not installed or the wireless transmission device 100 is out of order. It is represented by a polynomial such as a constant or a linear expression. In the present embodiment, the first threshold value is represented by a linear expression and the second threshold value is represented by a constant. For example, the first threshold value may be a linear expression such as "first threshold value = number of processes in the threshold value changing unit 222 x p" (p is a constant). In this case, the threshold value of the first threshold value is changed in proportion to the number of processes of the threshold value changing unit 222. The second threshold value is a value v1 in which the largest received power integrated value among the plurality of received power integrated values acquired in the area where the wireless transmission device 100 is installed always exceeds the elapsed time t2 or later. ..

Here, the case where the threshold value is changed according to the elapsed time and the case where the threshold value is not changed according to the elapsed time are compared. FIG. 16 is a graph showing the time change of the received power integrated value by comparing the case where the threshold value is changed and the case where the threshold value is not changed depending on the elapsed time. In FIG. 16, the time change of the maximum received power integrated value among the plurality of received power integrated values acquired in the area where the wireless transmission device 100 is installed, and the time change of the received power integrated value, and the wireless transmission device 100 is not installed or wireless transmission is performed. A graph showing the time change of the maximum received power integrated value among the plurality of received power integrated values acquired in the area where the device 100 is out of order, and superimposing the threshold value changed by the threshold changing unit 222. Is. In FIG. 16, the maximum received power integrated value among the plurality of received power integrated values acquired by the third car in which the wireless transmitting device 100 is installed is set to 100e (5), and the wireless transmitting device 100 is not installed 4 The maximum received power integrated value among the plurality of received power integrated values acquired by the car No. is 100f (6). Similar to FIG. 7, the vertical axis is the received power integrated value (unit: mW), and the horizontal axis is the elapsed time (unit: sec).

FIG. 16A shows a case where the threshold value is changed by the threshold value changing unit 222, and FIG. 16B shows a case where the threshold value is not changed by the threshold value changing unit 222. From FIG. 16A, by changing the threshold value to the first threshold value, the position estimation unit 223 installs the area where the wireless transmission device 100 is installed and the wireless transmission device 100 from an early stage after the elapsed time t1. It is possible to distinguish the area from which the wireless transmission device 100 has failed or the wireless transmission device 100 has failed. However, from FIG. 16B, when the threshold value changing unit 222 does not change the threshold value and only the second threshold value is used, the area where the wireless transmission device 100 is installed and the wireless transmission device 100 are not installed. Or, the time at which the wireless transmission device 100 can distinguish the faulty area is the elapsed time t2, and the time for the position estimation unit 223 to output the position estimation result is later than when the threshold value is changed. .. That is, by changing the threshold value in the threshold value changing unit 222, it is possible to shorten the time for producing the result of the position estimation.

In order to match the threshold value to be changed by the threshold value changing unit 222, the number of times to be changed, and the timing of change to the environment of the area where the wireless transmission device 100 is installed, the receiving terminal is previously set in the area where the wireless transmission device 100 is installed. It is set based on the received power measured at 200. Therefore, depending on the environment in which the wireless transmission device 100 is installed, the setting may be different from that of the present embodiment.

The explanation returns to the explanation about the position estimation unit 223. The position estimation unit 223 acquires a threshold value used for position estimation from the threshold value change unit 222. When the acquired threshold value is invalid, that is, until the elapsed time t2, which is a fixed time from the start of receiving the transmission data, the position estimation unit 223 does not calculate the received power integrated value described above. The process on the receiving terminal 200 is terminated.

The position estimation unit 223 sets the threshold value acquired from the threshold value change unit 222 in the area where the wireless transmission device 100 is installed, or in the area where the wireless transmission device 100 is not installed or the wireless transmission device 100 is out of order. It is set as a predetermined threshold value for estimating whether or not the receiving terminal 200 exists in the.

The position estimation unit 223 is in an area where the receiving terminal 200 is present in the area where the wireless transmission device 100 is installed, or the wireless transmission device 100 is not installed, or the wireless transmission device 100 is out of order. It is estimated whether the receiving terminal 200 exists. Then, the position estimation unit 223 further estimates the area where the receiving terminal 200 exists and the position within the area.

Here, the operation of the receiving terminal 200 will be described with reference to a flowchart. FIG. 17 is a flowchart showing a process executed by the receiving terminal 200. Except for the process of step S306, the process is the same as that described with reference to FIG. 13 of the first embodiment, and most of the description will be omitted.

The transmission data information analysis unit 221 acquires the identification number and the content information included in the transmission data acquired from the wireless reception unit 210 (step S105). The threshold value changing unit 222 calculates the elapsed time by taking the difference between the reception time acquired from the wireless reception unit 210 and the initial time. The threshold value changing unit 222 changes the threshold value according to the elapsed time (step S306). Then, the position estimation unit 223 registers the identification number, the received power, and the reception time in the transmission data information storage unit 230, and acquires the threshold value used for the position estimation from the threshold value changing unit 222 (step S107).

The position estimation unit 223 calculates the integrated value of the received power from the wireless transmission device 100 corresponding to the identification number based on the predetermined number of received powers, and the reception order of the plurality of identification numbers determined by the magnitude of the integrated received power value. , The position of the receiving terminal 200 is estimated based on the installation position of the wireless transmission device identified by the plurality of identification numbers (step S111).

As described above, according to the transmission / reception system according to the second embodiment, even if the wireless transmission device 100 is not installed or the wireless transmission device 100 is out of order, the receiving terminal owned by the user 200 positions can be estimated. If the installation area and position of the wireless transmission device 100 corresponding to the identification number that maximizes the reception power of the transmission data received by the receiving terminal 200 is used as the position estimation result, the wireless transmission device 100 is not installed or wirelessly. If the transmission device 100 is out of order, it is presumed that the user is in a vehicle that is not in the vehicle, for example. In the transmission / reception system according to the present embodiment, by comparing the positional relationship of the wireless transmission device 100 that has transmitted the transmission data, the position of the reception terminal 200 possessed by the user can be accurately estimated even in the above case.

Further, by changing the threshold value used for the position estimation of the receiving terminal 200, the position estimation result can be acquired more quickly. In the present embodiment, the received power integrated value is calculated, and the number of identification numbers used for position estimation is determined by the number of received power integrated values larger than a predetermined threshold value. Therefore, it is necessary to estimate the position after a certain period of time has elapsed so that the integrated received power values can be compared by the threshold value. Here, by dynamically changing the threshold value, the threshold value can be set more flexibly. Compared with the case where the threshold value is set to a predetermined value, when the threshold value is changed, the result of position estimation is started. It is possible to shorten the time to do.

20 Transmission / reception system, 100, 100a-100j wireless transmitter, 200 receiver terminal, 210 wireless receiver, 220 control unit, 221 transmission data information analysis unit, 222 threshold change unit, 223 position estimation unit, 224 content acquisition unit, 230 transmission Data information storage unit, 240 content storage unit, 250 display unit.

Claims (11)

A receiving terminal that receives transmission data transmitted from multiple wireless transmitters installed in multiple areas.
A wireless receiving unit that receives the transmission data from a plurality of the wireless transmission devices and measures the received power when the transmission data is received.
A transmission data information analysis unit that acquires the transmission data from the wireless reception unit and extracts an identification number that identifies the installation position of the wireless transmission device from the transmission data.
A transmission data information storage unit that registers the identification number and the received power from the wireless transmission device corresponding to the identification number in the received power table, and
A predetermined number of the received powers are acquired from the received power table, the integrated value of the received power from the wireless transmission device corresponding to the identification number is calculated based on the predetermined number of the received powers, and the integrated value of the received power is calculated. A position estimation unit that determines the reception order for the identification number according to the size and estimates the position of the receiving terminal based on the reception order and the installation position of the wireless transmission device identified by the identification number. A receiving terminal characterized by being provided with. The receiving terminal according to claim 1, wherein the position estimation unit estimates the position of the receiving terminal based on the presence or absence of the received power integrated value larger than a predetermined threshold value among the plurality of received power integrated values. .. When the received power integrated value larger than a predetermined threshold value is present among the plurality of received power integrated values, the position estimation unit transmits the transmission data including the identification number having the first receiving order. The receiving terminal according to claim 1, wherein the receiving terminal is presumed to be located in the vicinity of the wireless transmission device. The position estimation unit is a case where there is no received power integrated value larger than a predetermined threshold value among the plurality of received power integrated values.
The area where the wireless transmission device that has transmitted the transmission data including the identification number having the first reception order is installed is defined as the first area.
The area where the wireless transmission device that has transmitted the transmission data including the identification number having the second highest reception order is installed is defined as the second area.
When the first area and the second area are not adjacent to each other
A claim characterized in that it is an area between the first area and the second area, and it is estimated that the position of the receiving terminal is in the vicinity of the wireless transmission device installed on the first area side. The receiving terminal according to item 1. The position estimation unit is a case where there is no received power integrated value larger than a predetermined threshold value among the plurality of received power integrated values.
The radio transmission device that transmitted the transmission data including the identification number having the first reception order, and the radio transmitting the transmission data including the identification number having the second reception order. The area where the transmitter is installed is set as the first area.
The area where the wireless transmission device that has transmitted the transmission data including the identification number having the third reception order is installed is defined as the second area.
When the first area and the second area are not adjacent to each other
A claim characterized in that it is an area between the first area and the second area, and it is estimated that the position of the receiving terminal is in the vicinity of the wireless transmission device installed on the first area side. The receiving terminal according to item 1. It is provided with a threshold value changing unit that acquires the reception time of the received power from the wireless receiving unit, calculates the elapsed time from the time when the reception of the transmission data is started, and changes the predetermined threshold value according to the elapsed time. The receiving terminal according to any one of claims 2 to 5, characterized in that. The receiving terminal according to any one of claims 1 to 6, further comprising a display unit for displaying contents based on the position of the receiving terminal and the content information included in the transmission data. A plurality of the wireless transmitters installed in the plurality of areas,
A transmission / reception system including the receiving terminal according to any one of claims 1 to 7. A wireless transmitter that is installed in multiple areas and transmits transmission data to receiving terminals.
The transmission data includes an identification number that identifies the installation position of the wireless transmission device.
The transmission data is received from a plurality of the wireless transmission devices, the received power when the transmission data is received is measured, the identification number is extracted from the transmission data, and the identification number and the identification number corresponding to the identification number are described. The received power from the wireless transmission device is registered in the received power table, a predetermined number of received powers are acquired from the received power table, and the wireless transmission corresponding to the identification number is obtained based on the predetermined number of received powers. The integrated value of the received power from the device is calculated, the reception order is determined with respect to the identification number according to the magnitude of the integrated value of the received power, and the reception order and the installation of the wireless transmission device identified by the identification number. A wireless transmission device comprising transmitting the transmission data to the receiving terminal that estimates the position based on the position. It is a receiving method in which a receiving terminal receives transmission data transmitted from a plurality of wireless transmission devices installed in a plurality of areas.
The transmission data is received from a plurality of the wireless transmission devices, and the received power when the transmission data is received is measured.
The transmission data is acquired, and an identification number that identifies the installation position of the wireless transmission device is extracted from the transmission data.
The identification number and the received power from the wireless transmission device corresponding to the identification number are registered in the received power table.
A predetermined number of the received powers are acquired from the received power table, the integrated value of the received power from the wireless transmission device corresponding to the identification number is calculated based on the predetermined number of the received powers, and the integrated value of the received power is calculated. The feature is that the reception order is determined with respect to the identification number according to the size, and the position of the receiving terminal is estimated based on the reception order and the installation position of the wireless transmission device identified by the identification number. Receiving method. It is a method of transmitting and receiving transmission data transmitted from multiple wireless transmission devices installed in multiple areas to a receiving terminal.
The transmission data including the identification number that identifies the installation position of the wireless transmission device is transmitted, and the transmission data is transmitted.
The transmission data is received from a plurality of the wireless transmission devices, and the received power when the transmission data is received is measured.
The transmission data is acquired, the identification number is extracted from the transmission data, and the transmission data is extracted.
The identification number and the received power from the wireless transmission device corresponding to the identification number are registered in the received power table.
A predetermined number of the received powers are acquired from the received power table, the integrated value of the received power from the wireless transmission device corresponding to the identification number is calculated based on the predetermined number of the received powers, and the integrated value of the received power is calculated. The feature is that the reception order is determined with respect to the identification number according to the size, and the position of the receiving terminal is estimated based on the reception order and the installation position of the wireless transmission device identified by the identification number. Sending and receiving method.

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