JP2000091949A - Data transmission and reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sent and receive different pieces of data to and from mobile stations at the same time by allowing each mobile station to receive an ID data transmission command and send the ID data characteristic of the mobile station and also allowing each base station to send an ID data transmission command and send and receive data together with received ID data. SOLUTION: A reader writer 1 modulates control data to a tag 2 by a reader writer modulation part 4 and sends it as an interrogation radio wave from a reader writer transmission part 5. The tag 2 receives the interrogation radio wave by a tag reception part 11 and demodulates it by a tag demodulation part 12 to reproduce the control data. A tag control part 14 generates tag data stored in a tag memory (ID storage means) as response radio data according to the control data, modulates the radio wave by a tag modulation part 15, and sends it as a response radio wave from a tag transmission part 16. The reader writer 1 receives the response radio wave by a reader writer reception part 6, demodulates it by a reader writer demodulation part 8 to reproduce the response data, and analyzes the response data by a reader writer control part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission / reception system having one or a plurality of base stations and a plurality of mobile stations for transmitting / receiving data to / from each base station by radio. The present invention relates to an improvement for enabling data transmission and reception individually with a mobile station when applied to a ticket management system or an automatic transport system in a factory.

[0002]

2. Description of the Related Art FIG. 18 is a conceptual diagram showing the configuration of a conventional data transmitting / receiving system applied to a lift ticket management system and an automatic transport system in a factory. In the figure, 1 is a reader / writer, 2 is a tag for wirelessly transmitting and receiving data to and from the reader / writer 1, and 20 is a data transmission / reception area (communicable area) of the reader / writer 1.

Next, the operation will be described. When the tag 2 moves into the data transceivable area 20 of the reader / writer 1, the reader / writer 1 recognizes the entry of the tag 2 and transmits / receives data to / from the tag 2.

[0004]

Since the conventional data transmission / reception system is configured as described above, a plurality of tags 2 and 2 are provided in the data transmission / reception area 20 of the reader / writer 1.
.. Enter at the same time, the same data is transmitted and received to all of the plurality of tags 2, 2,. Therefore, for example, when applied to a lift ticket management system, if one skier has a plurality of lift coupons (tags 2, 2,...), All the coupons (tag 2) , 2,...), The same data is transmitted and received, a plurality of subtraction processes are performed at the same time, or when applied to an automatic transport system in a factory, each automatic transport vehicle (tag 2, 2, ..), The same data is transmitted and received to all the automatic transport vehicles (tags 2, 2,...) And the same movement control is performed. There is a problem that communication is not established due to interference with replies from tags 2, 2,... In the conventional data transmission / reception system, in order to avoid such a problem, it is necessary to operate each data transmission / reception area 20 so that only one tag 2 exists.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even if a plurality of mobile stations (tags) exist simultaneously in a communicable area of a base station (reader / writer), each mobile station (tag) must be addressed. To obtain a data transmission / reception system capable of transmitting and receiving different data.

[0006]

A data transmission / reception system according to the present invention includes a data transmission / reception system having one or more base stations and a plurality of mobile stations for transmitting / receiving data to / from each base station by radio. , An ID storage means provided in each mobile station for storing ID data unique to the mobile station; a call means provided in each base station for transmitting an ID data transmission command; A responding means for transmitting the ID data when receiving the data transmission command; and a receiving means provided in each base station for receiving the transmitted ID data.
It transmits and receives data together with D data.

[0007] A data transmission / reception system according to the present invention comprises:
In a data transmission / reception system having one or more base stations and a plurality of mobile stations that transmit and receive data wirelessly to and from each base station, each mobile station stores ID data unique to the mobile station. ID storage means, call means provided in each base station for transmitting an ID data transmission command, and state change when data is received together with mobile station-specific ID data from the base station provided in each mobile station An authentication flag to be provided in each mobile station, a response unit for transmitting the ID data if the state of the authentication flag has not changed when the ID data transmission command is received, and provided in each base station; Receiving means for receiving the transmitted ID data having the highest signal level, and authentication ID storage means provided in each base station for storing the received ID data; Serial calling means, while periodically operates the reception unit and the authentication ID storage unit, and performs transmission and reception of data along with the ID data stored in the authentication ID storage means.

[0008] A data transmission / reception system according to the present invention comprises:
The I provided in each base station and stored in the authentication ID storage means
Roll call calling means for periodically calling the mobile station of D data;
Roll call responding means provided in each mobile station for responding to the roll call, and deleting means provided in each base station for deleting the ID data from the authentication ID storage means when it is determined that there is no response. Are provided.

A data transmission / reception system according to the present invention comprises:
The deletion means deletes the ID data only when it is determined that there is no roll call response a plurality of times.

[0010] The data transmission / reception system according to the present invention comprises:
The I provided in each base station and stored in the authentication ID storage means
Roll call calling means for periodically calling the mobile station of D data;
Each mobile station is provided with a roll call response means for responding to the roll call, and the authentication ID storage means stores the newly received ID data in the ID data determined that there is no response if there is no free area. It is overwriting.

[0011] The data transmission / reception system according to the present invention comprises:
An erasure notifying means provided in each base station for transmitting an erasure signal of ID data to be deleted from the authentication ID storage means; and a status of an authentication flag provided in each mobile station when receiving the erasure signal addressed to itself. And reset means for returning the value.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a data transmission / reception system according to Embodiment 1 of the present invention. 1
Reference numeral denotes a reader / writer (base station), and reference numeral 2 denotes a tag (mobile station) that transmits and receives data to and from the reader / writer 1 by wireless.

In the reader / writer 1, reference numeral 3 denotes an oscillator for generating a carrier used for data transmission / reception, reference numeral 4 denotes a reader / writer modulator for modulating control data to the tag 2 with the carrier, and reference numeral 5 denotes an antenna which has an antenna. A reader / writer transmitting section for wirelessly transmitting control data from this antenna as an interrogation radio wave; 6 a reader / writer receiving section having an antenna for receiving a response radio wave from the tag 2 with this antenna; 7 a filter for filtering the response radio wave; Reference numeral 8 denotes a reader / writer demodulation unit that demodulates response radio waves to generate response data, 9 denotes a reader / writer memory (authentication ID storage unit) that stores the ID data of the authenticated tag 2 and the like, and 10 denotes each of the above units 1
, 9 to generate control data for the tag 2 whose ID data is stored in the reader / writer memory 9 and analyze response data.

In the tag 2, 11 is a tag receiving section for receiving the interrogation radio wave, 12 is a tag demodulation section for demodulating the interrogation radio wave and reproducing control data, and 13 is a tag for storing various tag data including ID data. Memory (ID storage means),
A tag control unit 14 changes the tag data stored in the tag memory 13 based on the demodulated control data, and generates the tag data stored in the tag memory 13 as response data. A tag modulator for modulating, 16 a tag transmitter for transmitting the modulated response data as the response radio wave, 17 a rectifier circuit for generating a DC voltage from a part of the power of the interrogation radio wave received by the tag receiver 11, Reference numeral 18 denotes this DC voltage,
A power supply unit for supplying operating power to 7 and a power supply capacitor 19 for storing the DC voltage.

FIG. 2 is an explanatory diagram showing an authentication table stored in the reader / writer memory 9 according to the first embodiment of the present invention. As shown in the figure, the authentication table is for sequentially storing each ID data in association with the authentication number, and here, a total of n pieces of ID data can be stored.

FIG. 3 is an explanatory diagram showing tag data stored in the tag memory 13 according to the first embodiment of the present invention. As shown in the figure, tag data includes tag management data including ID data unique to each tag, date and time of manufacture of the tag, write protection setting, authentication flag, and other information, and usage information associated with the tag. User (user's) information.

Next, the operation will be described. FIG. 4 is a main flowchart showing the operation of the reader / writer 1 according to Embodiment 1 of the present invention. In the figure, ST1 is an authentication flag simultaneous clearing step of wirelessly transmitting an interrogation radio wave using a command for clearing the authentication flag of the tag 2 as control data, and ST2 is an ID stored in the authentication table.
ST3 is an authentication processing step for authenticating ID data newly stored in the authentication table, and ST4 is for transmitting and receiving data together with each ID data stored in the authentication table. This is a user processing step, and ST5 is an antenna detection step of performing antenna detection. In the first embodiment, the series of operations is set to be repeated at a period of 10 to 100 ms.

FIG. 5 is a roll call processing sub-flowchart showing a detailed flow of the roll call processing step ST2 of the reader / writer 1 according to Embodiment 1 of the present invention. In the figure,
ST6 is a roll call initial setting step for setting an authentication number (here, "1") to be rolled first.
Reference numeral 7 denotes a roll call termination confirmation step for determining whether or not the roll call has been completed for all the authentication numbers (here, up to "n").
A registration determination step for determining whether or not the D data has been registered. ST9 is a roll call step for transmitting a roll call command together with the ID data. ST10 is a step for determining whether or not there is a response to the roll command related to the ID data. Is a roll call response determination step of determining
11 is a deletion step for deleting the ID data related to the roll call when there is no response and wirelessly transmitting a command for clearing the authentication flag together with the ID data related to the deletion. ST12 increments (decrements) the authentication number. This is an authentication number update step.

FIG. 6 is an authentication processing sub-flowchart showing a detailed flow of an authentication processing step of the reader / writer according to Embodiment 1 of the present invention. In the figure, ST13
ST14 is an authentication call step for transmitting an authentication command for requesting ID data transmission to a tag, and ST15 is an authentication call command for transmitting an authentication command for requesting ID data transmission to a tag. ST16 is a registration step for registering the newly responded ID data in the authentication table.

FIG. 7 is a flowchart showing the operation of the tag according to the first embodiment of the present invention. In the figure, ST
Reference numeral 17 denotes an authentication flag clear step for resetting (clearing) the authentication flag (setting to an unauthenticated state).
18 is a reception waiting step for waiting for reception of control data (command), ST19 is an authentication flag clear command determination step for determining whether or not the control data (command) is an authentication flag clear command, and ST20 is control data (Command) is an authentication command determining step of determining whether or not the received command is an authentication command. ST29 is a self-addressed address for determining whether the received ID data is a broadcast message or its own ID data. ST21 is an authentication flag setting step of setting an authentication flag. ST22 is a flag setting determining step of determining the setting state of the authentication flag.
23 is a response step for transmitting response data according to the control data (command).

FIGS. 8 to 10 are operation explanatory diagrams for explaining an authentication / roll call operation between such a reader / writer and a tag. In these figures, (a) shows the positional relationship between the reader / writer and the tag, and (b) shows the state of the authentication table in the positional relationship. Reference numeral 20 denotes a data transmission / reception area 20 (communicable area) of the reader / writer 1, reference numeral 21 denotes an interrogation radio wave for transmitting an authentication command,
Is the first tag 2 in response to this authentication command
A response radio wave for returning data, 23 is an interrogation radio wave for transmitting a roll call command of the first ID data, 24 is a response radio wave for returning a roll call response in response to the roll call command, 25 is an interrogation radio wave for transmitting an authentication command, Reference numeral 26 denotes a response radio wave from which the second tag 2 newly entering the data transmittable area in response to the authentication command returns the second ID data. In this way, the plurality of tags 2,..., 2 are registered in the authentication table, and the reader / writer 1 can transmit and receive data to and from each of the tags 2,.

FIG. 11 shows an ID in the reader / writer 1 in the data transmitting / receiving system according to the first embodiment of the present invention.
FIG. 4 is an operation explanatory diagram illustrating a data detection operation. In the figure, (a) is a detection operation when one tag 2 is located at a position close to the reader / writer 1, and (b) is a detection operation when one tag 2 is located at a position separated from the reader / writer 1. (C) shows the detection operation when the tags 2 and 2 are located at a position close to the reader / writer 1 and a position away from the reader / writer 1, respectively. Then, the reader / writer 1 performs full detection of the response radio wave including the ID data from the tag 2 and sets the data determination level to a substantially intermediate level of the maximum detection level, thereby obtaining the highest signal level among the plurality of ID data. Higher ones can be detected (received) (see the second to fourth stages in the figure).

FIG. 12 is an explanatory diagram showing an application example of the data transmission / reception system according to the first embodiment of the present invention. In the figure, 27 is the lift gate, 28 is the lift gate 2
Antennas installed on 7 sides, 29 is lift gate 27
The reader / writer 30 installed in the lift gate 27
The tag 2 is stored in the snow pass holder 30 as a snow pass, which is a snow pass holder held by a skier passing by the side. In the data transmission / reception system of the first embodiment, even if the skier holds a plurality of snow paths (tags 2, 2,...) In the snow path holder 30, the reader / writer 29 will ID data of paths (tags 2, 2, ...) are sequentially registered,
Since data can be transmitted / received to only one of them, the number of subtractions can be executed only in one snow path (tags 2, 2, ...). At this time, it is preferable to subtract from the one with the remaining number of times smaller.

As described above, according to the first embodiment, the tag memory 13 that is provided in each tag 2 and stores ID data unique to the tag 2 and the tag memory 13 that is provided in each reader / writer 1 and transmits an authentication command An authentication flag provided for each tag 2 and set when data is received together with ID data unique to the mobile station from the base station, and an authentication flag provided for each tag 2 and received when the authentication command is received. If the authentication flag has not already been set, a response means for returning the ID data is provided in each reader / writer 1,
A receiving means for receiving and detecting the highest ID signal among the returned ID data, and a reader / writer memory 9 provided in each reader / writer 1 for storing the received ID data are provided. Since the authentication operation by the calling means, the receiving means and the reader / writer memory 9 and the data transmission / reception operation based on the reader / writer memory 9 are alternately and repeatedly performed, the reader / writer 1 transmits data together with its own ID data to and from the tag 2. Can be transmitted and received, and data can be transmitted and received individually with the tag 2. Therefore, for example, even if a plurality of tags 2, 2,... Exist simultaneously in the data transmission / reception area 20 of the reader / writer 1, separate data can be transmitted / received to / from each other. There is an effect that the reply does not interfere.

Also, even if a plurality of tags 2, 2,... Exist in the data transmittable / receivable area 20, only one ID data is detected and stored in the reader / writer memory 9 in each authentication operation. In addition, the time required for each authentication operation can be minimized. At the same time, since the tag 2 once authenticated does not transmit the ID data again, the ID data of the plurality of tags 2, 2, ... existing in the data transmittable area 20 are sequentially stored in the reader / writer memory 9. Eventually, all tags 2, 2,.
There is an effect that the ID data can be stored and the data can be individually transmitted and received. In particular, when the moving speed of a mobile station (skier, automatic transport vehicle) is low, such as when applied to a lift ticket management system or an automatic transport system in a factory, ID data cannot be authenticated during the passage. These effects can be obtained without inconveniences such as the following.

According to the first embodiment, the I / Os provided in each reader / writer 1 and stored in the reader / writer memory 9
A call call calling means for periodically calling a tag of D data, a call call response means provided in each tag 2 for responding to the above call call, and a call call response means provided in each reader / writer 1 to determine that there is no response. Provided with an erasing means for deleting the ID data from the reader / writer memory 9, it is possible to delete extra ID data relating to the tag 2 that has escaped from the data transmission / reception area 20 of the reader / writer 1,
For example, it is sufficient if the reader / writer memory 9 is designed to have a storage capacity large enough to store the tags 2, 2,... Which can enter the data transmission / reception area 20 per period corresponding to the roll call cycle. There is an effect that data can be transmitted and received practically with the capacity. In particular, in a ski lift ticket or the like in which the number of tags 2 can be enormous, it is not necessary to store the ID data of all the tags 2, 2,... Issued, and the effect is enormous.

According to the first embodiment, an erasure notifying means provided in each reader / writer 1 for transmitting an erasure signal of ID data to be deleted from the reader / writer memory 9 and an erasure notification means provided in each tag 2 Since the reset means for clearing the authentication flag when the above-mentioned deletion signal is received is provided, the authentication flag of the tag 2 can be returned to the initial state. Therefore, when the ID data is deleted from the storage area, the authentication flag of the tag 2 is cleared at the same time, so that the tag 2 can transmit the ID data when receiving the next authentication command, and is originally deleted due to a communication error or the like. Even if the ID data of the tag 2 that should not be deleted is erroneously deleted, the tag 2 can be authenticated again.

Embodiment 2 FIG. 13 is an explanatory diagram of an authentication table stored in the reader / writer memory 9 according to Embodiment 2 of the present invention. As shown in the figure, in the authentication table, a no-response number flag that stores the number of no-call calls together with ID data is associated with each authentication number. The other configuration is the same as that of the first embodiment, and the description is omitted.

Next, the operation will be described. FIG. 14 is a roll call processing sub-flowchart showing a detailed flow of the roll call processing step ST2 of the reader / writer 1 according to Embodiment 2 of the present invention. In the figure, ST24 is a call response number confirmation step for determining whether or not there is no call response a plurality of times, ST30 is an increment step for incrementing a non-response number flag, and ST31 is a decrement step for decrementing a non-response number flag. It is. Except for this, the configuration is the same as that of FIG. 5 and the same step numbers are assigned and the description is omitted. Then, in the registration step, if there is no empty authentication flag in the white state, the newly responded ID data is registered in the authentication number having the large number of no-response count flags. The other operations are the same as those in the first embodiment, and the description is omitted.

As described above, according to the second embodiment, the deletion means deletes the ID data only when it is determined that there is no roll call response a plurality of times. Even if a response is not obtained, it will be deleted after checking again.
There is an effect (temporal hysteresis effect) of preventing the ID data of the tag 2 that should not be deleted due to such a communication error or the like. In particular, a plurality of reader / writers 1, 1,.
In the case where synchronous control is performed between the reader / writer 1 and the tag 2 because of the simultaneous installation, even if synchronous communication may become unstable due to signal interference or the like, You can keep track of your tags.

Embodiment 3 FIG. 15 is an explanatory table showing an authentication table stored in the reader / writer memory 9 according to Embodiment 3 of the present invention. As shown in the figure, the authentication table according to the third embodiment of the present invention stores the authentication status together with each ID data in association with the authentication number. The authentication state differs depending on whether the ID data is not stored, the case where the ID data is stored and the roll call is performed, and the case where the ID data is stored but the roll call is not performed. Take.
Here, for the sake of convenience, the states are "black", "white",
It is described as "ash".

FIG. 16 is a roll call processing sub-flowchart showing a detailed flow of the roll call processing step ST2 of the reader / writer 1 according to Embodiment 3 of the present invention. In the figure, ST25 is a white color registration processing step of registering an authentication state of "white" in association with ID data having a roll call response, and ST26 is performing authentication of "gray" in association with ID data having no roll call response. This is a gray registration processing step for registering a state. Except for this, the configuration is the same as that of FIG. 5 and the same step numbers are assigned and the description is omitted.

FIG. 17 is an authentication processing sub-flowchart showing a detailed flow of authentication processing step ST3 of reader / writer 1 according to Embodiment 3 of the present invention. In the figure, ST27 is an authentication table empty judgment step for judging whether or not all the authentication states of “white” are registered in the authentication table, and ST28 is an empty authentication number (= authentication state whose authentication state is not “white”). Number)
This is a registration step of overwriting and registering the D data together with the authentication state of “white”. Except for this, the configuration is the same as that of FIG. 6 and the same step numbers are given and the description is omitted. Other configurations and operations are the same as those in the first embodiment, and a description thereof will not be repeated.

As described above, according to the third embodiment, the roll call calling means provided in each reader / writer 1 and periodically calling the tag 2 of the ID data stored in the reader / writer memory 9; 2 and a roll call responding means for responding to the roll call, the newly received ID data is overwritten on the ID data determined to have no response. .. Only when the reader / writer memory 9 is configured with the minimum necessary storage capacity corresponding to the number of tags 2, 2,... That can be accommodated at one time, and a call response cannot be obtained due to a temporary communication error. Even if there is, there is an effect that the confirmation can be performed again and the data can be transmitted and received. In particular, in a ski lift ticket or the like in which the number of tags 2, 2,... Can be enormous, there is no need to store ID data of all tags to be issued, and the effect is enormous.

In the third embodiment, when new ID data is registered or when the authentication status is registered, the registration is simply performed when new ID data is generated. At the time of authentication state registration, the registration may be performed and the authentication data may be sorted. And as a sorting method,
For example, sorting may be performed in the order of white-gray-black, or when changing to the ash state, data related to the time may be provided together with the state information, and the ash may be further sorted in the descending time order. It is possible to do.

Although the registration number of the new ID data is not specified in the third embodiment, the registration number may be registered in the gray state only when there is no black state. In this case, it is preferable to register the ID that has been in the gray state first among the registration numbers in the gray state. In that case, the registration time may be deleted from the oldest one.

[0037]

According to the present invention, ID storage means provided in each mobile station for storing ID data unique to the mobile station, calling means provided in each base station for transmitting an ID data transmission command, A response unit provided in each mobile station for transmitting the ID data when receiving the ID data transmission command; and a receiving unit provided in each base station for receiving the transmitted ID data. The station receives the received I
Since data is transmitted and received together with the D data, the base station can transmit and receive data with its own ID data to and from the mobile station, and can perform data transmission and reception individually with the mobile station. Therefore, for example, even if a plurality of mobile stations exist simultaneously in the communicable area of the base station,
Different data can be transmitted / received to / from each of them, and there is an effect that a reply from the mobile station does not cause interference.

According to the present invention, provided in each mobile station,
ID storage means for storing ID data unique to the mobile station, calling means provided in each base station for transmitting an ID data transmission command, and ID data unique to the mobile station provided in each mobile station and transmitted from the base station. An authentication flag that changes state when data is received, and a response unit that is provided in each mobile station and transmits the ID data if the state of the authentication flag does not change when the ID data transmission command is received. Receiving means provided at each base station for receiving the highest ID signal among the transmitted ID data, and an authentication ID provided at each base station and storing the received ID data
The base station transmits and receives data together with the ID data stored in the authentication ID storage unit while periodically operating the calling unit, the reception unit, and the authentication ID storage unit. Data can be transmitted and received with the mobile station together with its own ID data, and data can be transmitted and received individually with the mobile station.
Therefore, for example, even if a plurality of mobile stations exist simultaneously in the communicable area of the base station, there is an effect that different data can be transmitted and received for each of them.

Further, even if a plurality of mobile stations exist in the communicable area, only one ID data is recognized and stored in the authentication ID storage means in each operation. Time can be kept to a minimum. At the same time, the mobile station once authenticated has an ID
Without transmitting data, the authenticated ID data is sequentially stored in the authentication ID storage means, so that the ID data of all mobile stations existing in the communicable area are finally stored and individually transmitted and received. There is an effect that can be performed. In particular, when the moving speed of the mobile station (skier, automatic carrier) is low, such as when applied to a lift ticket management system or an automatic transport system in a factory, inconvenience such as the inability to recognize the passage occurs. Without these, these effects can be obtained.

According to the present invention, provided in each base station,
Roll call calling means for periodically calling the mobile station of the ID data stored in the authentication ID storage means, provided in each mobile station;
A roll call response means for responding to the roll call and a deletion means provided at each base station for deleting the ID data from the authentication ID storage means when it is determined that there is no response are provided. It is possible to delete extra ID data relating to a mobile station that has escaped from the communicable area from the station. For example, the authentication ID storage means has a storage capacity enough to store mobile stations that can enter the communicable area per unit time. Is sufficient, and there is an effect that data transmission / reception can be performed practically with a minimum necessary storage capacity. In particular, in the case of a ski lift ticket or the like in which the number of mobile stations can be enormous, there is no need to store ID data of all issued mobile stations, and the effect is enormous.

According to the present invention, the deletion means deletes the ID data only when it is determined that there is no roll call response a plurality of times. Therefore, when the roll call response cannot be obtained due to a communication error due to temporary noise or the like. Even if there is, it is deleted after confirmation again, and there is an effect that the ID data of the mobile station that should not be deleted due to such a communication error can be prevented from being deleted.

According to the present invention, provided in each base station,
Roll call calling means for periodically calling the mobile station of the ID data stored in the authentication ID storage means, provided in each mobile station;
Providing a roll call response means for responding to the roll call,
The authentication ID storage means overwrites the newly received ID data with the ID data determined that there is no response if there is no free space, so it is necessary to correspond to the number of mobile stations that can be accommodated in the communicable area at one time. Authentication ID with minimum storage capacity
Even if a roll call response cannot be obtained due to a temporary communication error simply by configuring the storage means, it is possible to confirm again and to transmit and receive data. In particular, in the case of a ski lift ticket or the like in which the number of mobile stations can be enormous, there is no need to store ID data of all issued mobile stations, and the effect is enormous.

According to the present invention, provided in each base station,
An erasure notifying means for transmitting an erasure signal of ID data to be deleted from the authentication ID storage means, and a reset means provided in each mobile station for returning a state of an authentication flag when receiving the erasure signal addressed to the mobile station. Therefore, the authentication flag of the mobile station can be returned to the initial state. Therefore, when the ID data is deleted, the authentication flag of the mobile station is cleared at the same time, so that the mobile station can transmit the ID data when receiving the next ID data transmission command, and is originally deleted due to a communication error or the like. Even if ID data of a mobile station that should not be deleted is erroneously deleted, the mobile station can be authenticated again.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a data transmission / reception system according to a first embodiment of the present invention.

FIG. 2 is an explanatory table showing an authentication table stored in a reader / writer memory according to Embodiment 1 of the present invention;

FIG. 3 is an explanatory diagram showing tag data stored in a tag memory according to the first embodiment of the present invention.

FIG. 4 is a main flowchart showing an operation of the reader / writer according to Embodiment 1 of the present invention.

FIG. 5 is a roll call processing sub-flowchart showing a detailed flow of a roll call processing step of the reader / writer according to Embodiment 1 of the present invention.

FIG. 6 is an authentication processing sub-flowchart showing a detailed flow of an authentication processing step of the reader / writer according to Embodiment 1 of the present invention.

FIG. 7 is a flowchart showing an operation of the tag according to the first embodiment of the present invention.

FIG. 8 is an operation explanatory diagram illustrating an authentication / roll call operation between the reader / writer and the tag according to the first embodiment of the present invention (part 1).

FIG. 9 is an operation explanatory diagram illustrating an authentication / roll call operation between the reader / writer and the tag according to the first embodiment of the present invention (part 2).

FIG. 10 is an operation explanatory diagram illustrating an authentication / roll call operation between the reader / writer and the tag according to the first embodiment of the present invention (part 3).

FIG. 11 is an operation explanatory diagram illustrating an ID data detection operation in the data transmission / reception system according to the first embodiment of the present invention.

FIG. 12 is an explanatory diagram showing an application example of the data transmission / reception system according to the first embodiment of the present invention.

FIG. 13 is an explanatory diagram of an authentication table stored in a reader / writer memory according to Embodiment 2 of the present invention.

FIG. 14 is a roll call processing sub-flowchart showing a detailed flow of a roll call processing step of the reader / writer according to Embodiment 2 of the present invention.

FIG. 15 is an explanatory diagram showing an authentication table stored in a reader / writer memory according to Embodiment 3 of the present invention;

FIG. 16 is a roll call processing sub-flowchart showing a detailed flow of a roll call processing step of the reader / writer according to Embodiment 3 of the present invention.

FIG. 17 is an authentication processing sub-flowchart showing a detailed flow of an authentication processing step of the reader / writer according to Embodiment 3 of the present invention.

FIG. 18 is a conceptual diagram showing a configuration of a conventional data transmission / reception system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reader / writer (base station) 2 Tag (mobile station) 9 Reader / writer memory (authentication ID storage means) 13 Tag memory (ID storage means)

Claims (6)

[Claims] 1. A data transmission / reception system having one or more base stations and a plurality of mobile stations for transmitting and receiving data to and from each base station by radio, provided in each mobile station, ID storage means for storing ID data, calling means provided in each base station for transmitting an ID data transmission command, and transmission means provided in each mobile station for transmitting the ID data when receiving the ID data transmission command A data transmission / reception system, comprising: a response unit provided in each base station; and a reception unit for receiving the transmitted ID data, wherein the base station transmits and receives data together with the received ID data. 2. A data transmission / reception system having one or more base stations and a plurality of mobile stations for transmitting and receiving data to and from each base station by radio, provided in each mobile station, ID storage means for storing ID data, calling means provided in each base station for transmitting an ID data transmission command, provided in each mobile station and receiving data together with ID data unique to the mobile station from the base station And an authentication flag, which is provided in each mobile station and whose status does not change when the ID data transmission command is received, if the status of the authentication flag has not changed.
Response means for transmitting D data; receiving means provided in each base station for receiving the transmitted ID data having the highest signal level; and receiving means provided in each base station for storing the received ID data. The base station transmits and receives data together with the ID data stored in the authentication ID storage unit while periodically operating the calling unit, the reception unit, and the authentication ID storage unit. Characteristic data transmission / reception system. 3. A roll call calling means provided at each base station and periodically calling the mobile station of the ID data stored in the authentication ID storage means; provided at each mobile station and responding to the roll call. 2. The method according to claim 1, further comprising: a roll call response unit; and an erasure unit provided at each base station and for deleting the ID data from the authentication ID storage unit when it is determined that there is no response. 2. The data transmission / reception system according to 2. 4. The data transmission / reception system according to claim 3, wherein the erasing means deletes the ID data only when it is determined that there is no roll call response a plurality of times. 5. A roll call calling means provided at each base station and periodically calling the mobile station of the ID data stored in the authentication ID storage means, provided at each mobile station and responding to the roll call. 3. A roll call response means, wherein the authentication ID storage means overwrites the newly received ID data with the ID data determined to have no response if there is no free space. Data transmission and reception system. 6. An erasure notifying means provided in each base station for transmitting an erasure signal of ID data to be deleted from the authentication ID storage means, and when each of the mobile stations receives the erasure signal addressed to itself. 6. The data transmission / reception system according to claim 3, further comprising: reset means for returning a state of the authentication flag.