JP5227751B2 - Wireless communication system that selects and responds to interrogators - Google Patents

Description

  The present invention relates to an IC tag system, and more particularly to a technique for suppressing power consumption on the IC tag side.

An IC tag system is composed of a tag including an IC including data and an antenna, and a reader that reads and writes the data of the tag. Usually, a tag carried by a user operates with a built-in battery as a power source and is placed on a wall near the door. The installed reader operates with an external power source.
As a case where an IC tag system is used, for example, there is room entry management. Specifically, when the tag captures a question signal repeatedly transmitted from the reader, the tag sends authentication data back to the reader, and the reader performs authentication based on the received data to unlock the entrance door. .

  In the IC tag system, it is necessary to install one reader at a place to be managed one by one as in the room management described above. However, when the user carrying the tag moves, The tag receives a question signal from other than the intended reader. Since the tag transmits a response signal when it receives a question signal, when the number of question signals received from a reader other than the target reader increases, the number of response signals to be transmitted in vain increases and power consumption increases. It will be.

Here, there is a technique in which a reader sends an inquiry signal only to a specific tag. In this technology, first, a reader communicates to obtain a tag ID of a tag, and after authentication, data can be transmitted to a specific tag by transmitting data together with the tag ID (see Patent Document 1). ).
According to this technique, the reader can transmit data to a target tag.
Japanese Unexamined Patent Publication No. 2000-91949

However, in this technology, since the reader and the tag must always communicate once for exchanging the tag ID, the number of times the tag transmits a response signal to the reader is not reduced. It does not reduce power consumption.
Therefore, an object of the present invention is to provide a communication system that can communicate with an intended reader and can suppress power consumption of a tag.

  In order to solve the above problems, a communication system according to the present invention includes an interrogator and a responder, and the interrogator is a communication system that performs wireless communication with the responder, and the interrogator identifies the own device. An inquiry signal including identification information for transmitting the response signal in a predetermined cycle; and a response reception unit for receiving a response signal to the question signal from the responder, wherein the responder is a specific interrogator. The same as the identification information included in the question signal received by the question receiving means and the question receiving means for receiving the question signal from the interrogator. If it is determined that the identification information is stored in the storage means, a response signal is transmitted in response to the received question signal. If it is determined that the identification information is not stored in the storage means, the received question Respond to signal Characterized in that it comprises a response transmitting means does not transmit the signal.

The communication system according to the present invention has the above-described configuration, so that the interrogator that has transmitted the received interrogation signal can be known, and the specific interrogator that is the target interrogator is stored. Therefore, it is possible to know whether the received interrogation signal is an interrogation signal transmitted from the target interrogator.
Therefore, it becomes possible to transmit a response signal only when an interrogation signal from the target interrogator is received, and power consumption can be suppressed compared to a case where response signals are transmitted for all the interrogation signals received. And a response signal can be transmitted to the target interrogator.

  The storage unit stores a plurality of pieces of identification information, and the response transmission unit sequentially compares the identification signal included in the received question signal with the identification information stored in the storage unit. Then, when there is the same identification information, it is determined that the information is stored in the storage unit, and the comparison may be performed with the identification information stored in the storage unit according to a predetermined order. Good.

  Thus, when determining whether or not the identification information of the interrogator included in the received interrogation signal and the identification information of the stored interrogator are sequentially compared and stored, a predetermined order is determined. Since it is compared with the identification information stored in the above, the order of the frequency included in the received question signal is determined in descending order, so that it is often judged by the first comparison whether or not it is stored. Become. That is, as a whole, it can be quickly determined that the identification information of the interrogator included in the received question signal is stored, and the response signal can be transmitted quickly. In addition, since the number of comparisons with the stored identification information of the interrogator is reduced, power consumption can be suppressed.

  The responder according to the present invention includes an interrogator and a responder. The interrogator is a responder used in a communication system that performs wireless communication with the responder, and stores identification information for identifying a specific interrogator. Same as the identification information included in the question signal received by the question receiving means, the question receiving means for receiving from the interrogator a question signal including identification information for identifying the interrogator. If it is determined that the identification information is stored in the storage means, a response signal is transmitted in response to the received question signal. If it is determined that the identification information is not stored in the storage means, the received question Response transmitting means that does not transmit a response signal to the signal is provided.

The responder according to the present invention has the above-described configuration, and stores a specific interrogator that is a target interrogator when a question signal including identification information of the interrogator is received. Therefore, it is possible to know whether the received interrogation signal is an interrogation signal transmitted from the target interrogator.
Therefore, it becomes possible to transmit a response signal only when an interrogation signal from the target interrogator is received, and power consumption can be suppressed compared to a case where response signals are transmitted for all the interrogation signals received. And a response signal can be transmitted to the target interrogator.

<Embodiment>
<Overview>
The present invention pays attention to the fact that a tag needs to respond only to an interrogation signal transmitted from a target reader in response to an interrogation signal that is repeatedly transmitted by the reader at all times. Is.

Before describing the communication system of the present embodiment, a usage example of the communication system of the present invention will be briefly described with reference to FIG. 1 as compared with the conventional communication system.
In this embodiment, the reader is called an interrogator and the tag is called a responder.
FIG. 1 is a schematic diagram, and the interrogator, the signal transmission range, and the like do not accurately represent the actual size.

In FIG. 1, it is assumed that the interrogators A and B are installed in the corridor and control the opening and closing of the doors of the rooms A and B, respectively. Also, the alternate long and short dash line around the interrogator indicates the reach of the interrogation signal transmitted by the interrogator.
Assume that a responder holder (indicated by “responder” in the figure) walks from the right to the left along the corridor. A white arrow indicates a walking route. Assume that the holder of the responder a is walking toward the room A and the holder of the responder b is walking toward the room B. Only the interrogator A succeeds in the authentication of the responder a, and the responder b is the interrogator. Assume that only B succeeds in authentication.

In the conventional communication system, first, when the holder of the responder a enters the interrogation signal transmission range of the interrogator A, the responder a receives the interrogation signal and transmits the response signal. Interrogator A, which has received the response signal from responder a, succeeds in authentication and unlocks door A.
Next, when the holder of the responder b enters the interrogation signal transmission range of the interrogator A, the responder b receives the interrogation signal and transmits the response signal. Interrogator A that has received the response signal from responder b fails to authenticate and does not unlock door A.

When the holder of the responder b enters the interrogation signal transmission range of the interrogator B, the responder b receives the interrogation signal and transmits the response signal. Interrogator B, which has received the response signal from responder b, succeeds in authentication and unlocks door B.
Thus, since the interrogator that is the target of the responder b is not the interrogator A but the interrogator B, the response signal in response to the interrogator signal from the interrogator A is wasted.

In the communication system of the present invention, the responder b does not transmit a response signal to the interrogation signal from the interrogator A which is not the object, and transmits a response signal only to the interrogation signal from the target interrogator B. To do. That is, in this system, power consumption is suppressed by returning a response signal only to the target interrogator.
Hereinafter, the communication system of this embodiment will be described.

In this system, an interrogator installed near the door authenticates the responder possessed by the user, and if the authentication is successful, the door is opened and the user can pass.
<Configuration>
The interrogator 1000 and the responder 2000 that constitute this system will be described.
FIG. 2 is a functional block diagram of the interrogator 1000 and the responder 2000 according to the present invention. This system is usually composed of a plurality of interrogators and a plurality of responders, but each has the same configuration.

Assume that the interrogator 1000 is installed on a wall or the like and electricity is supplied from an external power source, and the responder 2000 is powered by a built-in battery 2600.
First, the interrogator 1000 includes a control unit 1100, a question signal transmission unit 1200, a response signal reception unit 1300, a responder ID table storage unit 1400, a self-interrogator ID storage unit 1500, an LF signal transmission unit 1800, an LF antenna 1810, an RF The signal receiving unit 1900 and the RF antenna 1910 are included.

The control unit 1100 includes a CPU, a memory, and the like (not shown), performs general control processing necessary for authentication of the responder 2000, and also performs processing unique to the present invention described below, for example, for identifying its own device. The question signal transmission unit 1200 is requested to transmit the question signal including the information.
Next, the question signal transmission unit 1200 has a function of generating a question signal and requesting the LF signal transmission unit 1800 to transmit it.

The LF signal transmission unit 1800 has a function of superimposing and amplifying the interrogation signal passed from the interrogation signal transmission unit 1200 on the signal component of the dielectric magnetic field and transmitting the signal from the LF antenna 1810.
When the response signal receiving unit 1300 receives the response signal from the RF signal receiving unit 1900, the response signal receiving unit 1300 has a function of passing the information extracted from the response signal to the control unit 1100.
The RF signal receiving unit 1900 has a function of receiving a response signal via the RF antenna 1910, analyzing the received response signal, and passing it to the response signal receiving unit 1300.

The structure of the question signal and the response signal will be described with reference to FIG. 3 in the section <Data>.
Next, the responder ID table storage unit 1400 has a function of storing a responder ID table used by the interrogator 1000 for authentication. That is, if the responder ID to be authenticated is the same as one of the responder IDs registered in this table, it is determined that the authentication is performed, and the interrogator 1000 unlocks the managed door.

The self-interrogator ID storage unit 1500 has a function of storing a self-interrogator ID for identifying the self-instrument.
The configuration of the responder ID table and the self-interrogator ID will be described with reference to FIG. 4 in the section <Data>.
Next, the responder 2000 includes a control unit 2100, a question signal receiving unit 2200, a response signal transmitting unit 2300, an interrogator ID table storage unit 2400, a self-responder ID storage unit 2500, a battery 2600, an LF signal receiving unit 2800, and an LF. The antenna 2810, the RF signal transmission unit 2900, and the RF antenna 2910 are included.

The control unit 2100 includes a CPU, a memory, a button, and the like (not shown). The control unit 2100 controls other processes such as issuing instructions to other function units and returning a response signal when receiving a question signal.
The question signal receiving unit 2200 has a function of receiving the question signal received from the LF signal receiving unit 2800, analyzing the received question signal, and passing necessary information to the control unit 2100.
The LF signal receiving unit 2800 has a function of receiving a question signal via the LF antenna 2810 and passing it to the received question signal receiving unit 2200.

  Further, the response signal transmission unit 2300 has a function of determining whether or not to transmit a response signal, generating a response signal when determining to transmit, and requesting the RF signal transmission unit 2900 to transmit. Whether the response signal is transmitted is determined by referring to the interrogator ID table stored in the interrogator ID table storage unit 2400, and the interrogator ID of the interrogator that transmitted the received interrogation signal is the interrogator ID table. If it is the same as one of the interrogator IDs registered in, it is determined to send a response signal.

The RF signal transmission unit 2900 has a function of transmitting the response signal passed from the response signal transmission unit 2300 via the RF antenna 2910.
Next, the interrogator ID table storage unit 2400 has a function of storing an interrogator ID table. This interrogator ID table is a table in which the interrogator ID of the interrogator to which the responder 2000 responds is registered.

The self-responder ID storage unit 2500 has a function of storing a self-responder ID for identifying the self-responder.
The configuration of the interrogator ID table and the self-responder ID will be described with reference to FIG.
Here, all or part of each process by each unit such as the control unit 1100 of the interrogator 1000 is realized by a CPU (not shown) executing various programs. All or part of each process performed by each unit is also realized by a CPU (not shown) executing various programs.

<Data>
Hereinafter, main data used by the communication system according to the present embodiment will be described with reference to FIGS.
FIG. 3 is a diagram illustrating a data configuration and example contents of the question signal and the response signal. 3A is a data configuration and content example of the question signal 10 transmitted by the interrogator 1000, and FIG. 3B is a diagram showing a data configuration and content example of the response signal 20 transmitted by the responder 2000. It is.

First, the question signal 10 in FIG. 3A is composed of a PR (PReamble) 11, a UW (Unique Word) 12, an interrogator ID 13 and a CRC 14.
PR11 is a bit string (synchronization code) indicating the start of data of the interrogation signal 10, and UW12 is a so-called frame synchronization signal. The CRC 14 is data used by the responder 2000 that has received the interrogation signal 10 to detect whether an error has occurred in the interrogation signal 10 received.

The interrogator ID 13 is an identifier of the interrogator 1000 that has transmitted the interrogator signal 10, and the self interrogator ID stored in the self interrogator ID storage unit 1500 is set.
Next, the response signal 20 in FIG. 3B is composed of PR21, UW22, interrogator ID23, responder ID24, and CRC25.
PR21 is a bit string (synchronization code) indicating the start of data of the response signal 20, and UW22 is a so-called frame synchronization signal. The CRC 25 is data for the interrogator 1000 that has received the response signal 20 to detect whether an error has occurred in the received response signal 20.

The interrogator ID 23 represents an identifier of the interrogator 1000, and indicates which interrogator 1000 the response signal 20 corresponds to the interrogator signal 10 transmitted from. In other words, the response signal 20 is a response signal transmitted in response to the interrogation signal transmitted from the interrogator indicated by the interrogator ID23.
The responder ID 24 is an identifier of the responder 2000 that has transmitted the response signal 20, and the own responder ID stored in the own responder ID storage unit 2500 is set.

  Next, FIG. 4A is a data configuration and content example of the responder ID table 1410, and FIG. 4B is a diagram illustrating a data configuration and content example of the self-interrogator ID 1510. These are data stored in the storage unit of the interrogator 1000. The responder ID table 1410 is stored in advance in the responder ID table storage unit 1400, and the own interrogator ID 1510 is stored in advance in the own interrogator ID storage unit 1500. It shall be.

First, the responder ID table 1410 in FIG. 4A includes an item number 1411 and a responder ID 1412.
The item number 1411 indicates the order of the responder IDs registered in this table. In the present embodiment, the number of responder IDs registered in the table is indicated. Note that the smaller the value of the item number 1411 is, the more frequently the corresponding responder ID 1412 is authenticated.

The responder ID 1412 indicates an ID for identifying the responder. In the present embodiment, 16 responder IDs are registered. For example, “Tag001”.
The self-interrogator ID 1510 in FIG. 4B is identification information for identifying the self-instrument.
Next, FIG. 5A is a data configuration and content example of the interrogator ID table 2410, and FIG. 5B is a diagram illustrating a data configuration and content example of the self-responder ID 2510. These are data stored in the storage unit of the responder 2000. The interrogator ID table 2410 is stored in advance in the interrogator ID table storage unit 2400, and the own responder ID 2510 is stored in advance in the own responder ID storage unit 2500. It shall be.

First, the interrogator ID table 2410 in FIG. 5A includes an item number 2411 and an interrogator ID 2412.
The item number 2411 indicates the order of the interrogator IDs registered in this table. In this embodiment, the interrogator ID 2412 has a higher frequency of returning a response signal as the value of the item number 2411 is smaller. That is, the frequency set in the interrogator ID 23 of the response signal 20 transmitted by the responder 2000 is in descending order. In other words, the ID of the interrogator 1000 such as a room where the holder of the responder 2000 frequently enters and exits is associated with the item number 2411 having a smaller value.

For example, the order of the interrogator IDs set in this table is determined by the system administrator or the like depending on the holder of the responder and the location of the interrogator. Specifically, the interrogator ID of the room in which the responder holder is working every day is set first, and the interrogator ID of the laboratory that only goes occasionally is set last.
The interrogator ID 2412 indicates an ID for identifying the interrogator. In the present embodiment, 16 interrogator IDs are registered. For example, “R100”.

The self responder ID 2510 in FIG. 5B is identification information for identifying the self responder.
<Operation>
Hereinafter, operations of the interrogator 1000 and the responder 2000 in the communication system described above will be described.
FIG. 6 is a flowchart showing the question signal transmission process of the interrogator 1000 and the response process of the responder 2000. In this figure, a dotted line represents transmission of a signal such as an interrogation signal.

When the control unit 1100 of the interrogator 1000 detects a start instruction, for example, pressing of an operation switch (not shown), the control unit 1100 requests the question signal transmission unit 1200 to transmit a question signal.
Upon receiving the request, the question signal transmission unit 1200 generates the question signal 10 in which the self-interrogator ID 1510 stored in the self-interrogator ID storage unit 1500 as the interrogator ID 13 is set, and the generated question signal 10 (FIG. 3 ( a) is transmitted to the LF signal transmission unit 1800 to request transmission. The question signal transmission unit 1200 stores the generated question signal 10 in the internal working memory, and passes the stored question signal 10 to the LF signal transmission / reception unit 1800 from the next request.

Upon receiving the request, the LF signal transmission / reception unit 1800 transmits the received question signal 10 via the LF antenna 1810 (step S10).
The control unit 1100 that has requested the question signal transmission unit 1200 to transmit the question signal 10 transmits a response signal 20 (see FIG. 3B) from the response signal reception unit 1300 within a predetermined period, for example, 300 ms. ) Is not received (step S11: NO), the question signal transmission unit 1200 is requested to transmit a question signal (step S10).

The control unit 1100 that has requested the question signal transmission unit 1200 to transmit the question signal receives the response signal from the response signal reception unit 1300 during a predetermined period after the request (step S11: YES). The responder ID 24 is extracted from the response signal 20 (step S12).
The response signal receiving unit 1300 receives the received response signal 20 from the RF signal receiving unit 1900 that has received the response signal 20 via the RF antenna 1910, and passes the received response signal 20 to the control unit 1100.

The control unit 1100 searches whether the same ID as the extracted responder ID 24 is registered in the responder ID 1412 of the responder ID table 1410 stored in the responder ID table storage unit 1400.
If the same ID as the responder ID 24 is registered in the responder ID 1412 (step S13: YES), the door managed by the interrogator 1000 is unlocked (step S14). On the other hand, when the same ID as the extracted responder ID 24 is not registered in the responder ID 1412 of the responder ID table 1410 (step S13: NO), nothing is performed.

The control unit 1100 requests the question signal transmission unit 1200 to transmit a question signal, and repeatedly performs communication processing (steps S10 to S14).
Next, processing of the responder 2000 will be described.
The LF signal receiving unit 2800 of the responder 2000 receives the interrogation signal 10 transmitted by the interrogator 1000 via the LF antenna 2810, and passes the received interrogation signal 10 to the interrogation signal reception unit 2200 (step S20).

The question signal receiving unit 2200 takes out the interrogator ID 13 of the received question signal 10 and passes it to the control unit 2100 (step S21).
Upon receiving the interrogator ID13, the control unit 2100 requests the response signal transmission unit 2300 to transmit a response signal. At the time of this request, the interrogator ID 13 received from the question signal receiving unit 2200 is passed.

Upon receiving the request, the response signal transmission unit 2300 first determines whether or not the same ID as the received interrogator ID13 is registered in the interrogator ID table 2410 of the interrogator ID table 2410 stored in the interrogator ID table storage unit 2400. Search for.
Specifically, the interrogator ID 2412 corresponding to the interrogator ID table 2410 from the item number 2411 “1” in order is compared with the received interrogator ID13.

If it is not the same, it is compared with the interrogator ID 2412 of the next item number 2411 (step S23: NO), and if it is the same (step S23: YES), the response signal 20 is generated, and the generated response signal 20 is the RF signal. It passes to the transmission part 2900 and requests transmission.
The response signal transmission unit 2300 sets the received interrogator ID13 as the interrogator ID23 of the response signal 20, and acquires the self-responder ID 2510 stored in the self-responder ID storage unit 2500 via the control unit 2100. The response signal 20 is generated by setting as the responder ID 24.

Upon receiving the request, the RF signal transmission unit 2900 transmits the received response signal 20 via the RF antenna 2910 (step S24).
On the other hand, even if the interrogator ID 2412 corresponding to the last item number 2411 “16” in the interrogator ID table 2410 is compared with the interrogator ID 2412 corresponding to the last item number 2411 “16”, there is no same as the received interrogator ID13 (step (S22: YES), the response signal transmission unit 2300 terminates the process without transmitting the response signal.

  For example, if the received interrogator ID 13 is “R100” in the interrogator ID table 2410 of FIG. 5, first, the interrogator ID 2412 “R001” corresponding to the item number 2411 “1” of the interrogator ID table 2410 is set. Since the received interrogator ID 13 “R100” is compared with the received interrogator ID 13 “R100”, it is compared with the interrogator ID 2412 “R100” of the item number 2411 “2”. In this case, since it is the same, the response signal is transmitted without comparing items No. 2411 “3” and after.

<Supplement>
The communication system according to the present invention has been described above based on the embodiment. However, this system can be partially modified, and the present invention is not limited to the above-described embodiment. That is,
(1) In this embodiment, the contents of the interrogator ID table 2410 are determined in advance, but may be rewritten as appropriate.

For example, this is a case where the responding interrogator changes due to a change in the room that frequently enters and exits due to a change in the department of the holder of the responder 2000.
As a changing method, for example, the data is rewritten by setting a transponder in a rewriting device having a function of transmitting data by an LF signal. Specifically, a rewrite command and rewrite data are transmitted from the rewrite device using an LF signal. The LF signal receiving unit 2800 of the responder 2000 generates power when receiving a signal from the rewriting device, and activates the control unit 2100 and the like with this power, and the activated control unit 2100 receives the interrogator ID using the received rewrite data. The contents of the table 2410 are rewritten.

Further, the responder 2000 may be provided with a USB port, and data may be rewritten by transmitting data from a personal computer or the like.
Further, during the operation of this communication system, the order of the interrogator IDs 2412 in the interrogator ID table 2410 may be rewritten in the order of the frequency of communication. For example, the interrogator ID communicated for each responder ID and the number of times are stored for one month in an external management server or the like, and the interrogator IDs are stored in order of decreasing number of times by the rewriting device at the beginning of the next month. For example, sorting.

Alternatively, the responder side may store the interrogator IDs that have been communicated and the number of times, and rearrange them in a timely manner.
In the present embodiment, the interrogator ID table 2410 in which a plurality of interrogator IDs are registered is stored, but one interrogator ID may be stored.
(2) In the embodiment, the interrogator performs the authentication process regardless of whether or not the received response signal is transmitted with respect to the interrogation signal transmitted by itself. Authentication processing may be performed only in the case of a response signal to the question signal.

Specifically, the control unit 1100 that has received the response signal from the response signal receiving unit 1300 extracts the interrogator ID 23 from the received response signal 20, and stores the extracted interrogator ID 23 in the own interrogator ID storage unit 1500. If it is different, the received response signal is discarded, and the same processing as when no response signal is received is performed (see step S11 in FIG. 6).
(3) In the embodiment, the authentication of the responder is performed by the interrogator. However, the present invention is not limited to this. For example, the responder ID in the response signal received by the interrogator may be transmitted to an external authentication server or the like, authenticated by the authentication server, and sent back.
(4) In the interrogator and the responder included in the communication system, all or a part of each component in FIG. 2 and the like may be realized by an integrated circuit of one chip or a plurality of chips.
(5) A program for causing the CPU to execute each control process (see FIG. 6) for realizing each function of the communication system shown in the embodiment is recorded on a recording medium or via various communication paths, etc. It can also be distributed and distributed. Such a recording medium includes an IC card, an optical disk, a flexible disk, a ROM, a flash memory, and the like. The distributed and distributed program is used by being stored in a memory or the like that can be read by the CPU in the device, and each function described in the embodiment is realized by the CPU executing the program.

It is a figure which shows the usage example of this communication system. It is a functional block diagram of the interrogator 1000 and the responder 2000 concerning this invention. FIG. 3A shows the data configuration and content example of the interrogation signal 10 transmitted by the interrogator 1000, and FIG. 3B shows the data configuration and content example of the response signal 20 transmitted by the responder 2000. FIG. 4A shows the data configuration and content example of the responder ID table 1410, and FIG. 4B shows the data configuration and content example of the self-interrogator ID 1510. FIG. 5A shows a data configuration and content example of the interrogator ID table 2410, and FIG. 5B shows a data configuration and content example of the self-responder ID 2510. It is a flowchart which shows the question signal transmission process of the interrogator 1000, and the response process of the responder 2000.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Question signal 20 Response signal 1000 Interrogator 1100 2100 Control part 1200 Question signal transmission part 1300 Response signal reception part 1400 Response machine ID table memory | storage part 1500 Self-interrogator ID memory | storage part 1800 LF signal transmission part 1810 2810 LF antenna 1900 RF signal reception Unit 1910 2910 RF antenna 2000 transponder 2200 interrogation signal reception unit 2300 interrogation signal transmission unit 2400 interrogator ID table storage unit 2500 auto responder ID storage unit 2800 LF signal reception unit 2900 RF signal transmission unit

Claims (3)

An interrogator and a responder, the interrogator is a communication system that performs wireless communication with the responder,
The interrogator is
Question transmission means for transmitting a question signal including identification information for identifying the own device at a predetermined cycle;
Response receiving means for receiving a response signal for the interrogation signal from the responder,
The responder is
Storage means for storing a plurality of identification information for identifying a specific interrogator;
For each identification information stored in the storage means, a frequency recording means for recording information indicating a communication frequency with an interrogator corresponding to the identification information;
Question receiving means for receiving the question signal from the interrogator;
If it is determined that the same identification information as the identification information included in the question signal received by the question receiving means is stored in the storage means, a response signal is transmitted for the received question signal, If it is determined that it is not stored in the storage means, the response means for not transmitting a response signal to the received question signal,
The response transmission means sequentially compares the identification information included in the received question signal and each of the identification information stored in the storage means, and when there is first matching identification information, It is judged that the same identification information is memorize | stored in the said memory | storage means, The said communication is performed in order with the said high communication frequency based on the information which shows the said communication frequency . It consists of an interrogator and a responder, and the interrogator is a responder used in a communication system that performs wireless communication with the responder.
Storage means for storing a plurality of identification information for identifying a specific interrogator;
For each identification information stored in the storage means, a frequency recording means for recording information indicating a communication frequency with an interrogator corresponding to the identification information;
Question receiving means for receiving a question signal including identification information for identifying the interrogator from the interrogator;
If it is determined that the same identification information as the identification information included in the question signal received by the question receiving means is stored in the storage means, a response signal is transmitted for the received question signal, If it is determined that it is not stored in the storage means, the response means for not transmitting a response signal to the received question signal,
The response transmission means sequentially compares the identification information included in the received question signal and each of the identification information stored in the storage means, and when there is first matching identification information, It is judged that the same identification information is memorize | stored in the said memory | storage means, The said responder is performed in order with the said high communication frequency based on the information which shows the said communication frequency . An interrogator and a responder, the interrogator is a signal transmission method used in a responder used in a communication system that performs wireless communication with the responder,
A memory storing a plurality of pieces of identification information for identifying a specific interrogator;
For each piece of identification information stored in the memory, a frequency recording step for recording information indicating a communication frequency with an interrogator corresponding to the identification information;
A question receiving step for receiving a question signal including identification information for identifying the interrogator from the interrogator;
If it is determined that the same identification information as the identification information included in the question signal received in the question reception step is stored in the memory, a response signal is transmitted to the received question signal, If it is determined that it is not stored in the memory, a response transmission step that does not transmit a response signal to the received interrogation signal is provided,
The response transmission step sequentially compares the identification information included in the received inquiry signal and each of the identification information stored in the memory, and when there is the first matching identification information, the same information The signal transmission method is characterized in that it is determined that the identification information is stored in the memory and the comparison is performed in descending order of the communication frequency based on the information indicating the communication frequency .

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