JP5042640B2 - Wireless authentication system - Google Patents

Description

  The present invention is used in an RFID (RADIO FREQUENCY IDENTIFICATION) system, and a responder (IC tag) is activated in a non-contact manner from an activation device, receives information, and sends information to an authentication device. The present invention relates to a wireless authentication system realized as a non-contact IC tag system or an IC card system.

  FIG. 15 is a block diagram showing a typical prior art of a wireless authentication system. This wireless authentication system is configured by including the responder 2 in the interrogator 1 constituting the activation device and the authentication device. For example, as shown in FIG. 16, when used for entrance / exit management of the room 3, the interrogator 1 is attached in the vicinity of the door 4 to manage which user exists in the room 3 and when it enters and exits. When used for goods management, the interrogator 1 is attached to the vicinity of the entrance of the warehouse or the transportation route, and what goods are received and received at what time, how many goods are present in the warehouse, etc. Can be managed.

  The interrogator 1 superimposes the activation signal generated by the control circuit 11 on the signal component of the induction magnetic field in the LF band transmission circuit 12, amplifies it, and responds from the LF antenna 13 by the first wireless communication method (LF). Transmit to device 2. As a result, an authentication area 5 is formed around the responder 2, and the activation signal from the interrogator 1 is received by the LF antenna 21 in the responder 2 possessed by the user 6 or the like entering the authentication area 5. After that, the LF band receiving circuit 22 activates the control circuit 23, and the control circuit 23 generates a response signal including unique identification information (ID) set in advance in the LF band receiving circuit 22. 25 to the interrogator 1 by the second wireless communication method (UHF).

  The response signal is received by the RF transmission / reception circuit 15 from the RF antenna 14 of the interrogator 1 and input to the control circuit 11 to identify the responder that responded. If the identified transponder has identification information registered in advance, the control circuit 11 authenticates with the second wireless communication method (UHF) from the RF transceiver circuit 15 via the RF antenna 14. The completed identification information of the responder 2 is transmitted as an ACK signal. When the ACK signal is received from the RF antenna 25 by the RF transmission / reception circuit 24, the control circuit 23 ends the transmission of the response signal. In addition, when the authentication is completed, the control circuit 11 indicates the completion of the authentication with the display unit 16 and the buzzer 18 and simultaneously unlocks the door 4.

  In this way, the responder 2 is activated by the electromotive force in the LF band (long wave band: 30 to 300 kHz), and the control circuit 23 uses the built-in battery 26 as a power source in the RF transceiver circuit 24 and the UHF band (ultra-high frequency band: A conventional technique for returning a response signal of 300 MHz to 3 GHz is disclosed in Patent Document 1, for example. With such a configuration, the authentication area 5 can be accurately defined within a relatively narrow range of 1.5 to 2 m. Further, while the power consumption of the RF transmission / reception circuit 24 in the UHF band is as large as 10 to 20 mA, the LF band reception circuit 22 in the LF band starts up with a weak power of several μA. By not using 24, the power consumption of the built-in battery 26 is suppressed, and the life of the responder 2 is extended.

  However, the prior art of this Patent Document 1 is used as an IC chip system having the above-described sensors, and the interrogator 1 knows the identification information of the responder 2 to be called in advance and designates it. Call. Accordingly, as shown in FIG. 17, the interrogator 1 repeatedly transmits an activation signal in the LF band at a predetermined cycle, and the responder 2 designated by the activation signal responds in the UHF band. A signal is returned. The interrogator 1 transmits an ACK signal in the UHF band to the responder whose identification information is authenticated by the response signal (in the example of FIG. 17, ID1 and ID3 in the first cycle and ID2 in the next cycle).

  On the other hand, when used for room entry / exit management and article management as shown in FIG. 16, the responder 2 includes a large number of responders whose identification information (ID) is unknown in the authentication area 5. May exist. In such a case, in response to a start signal for starting an arbitrary responder from the interrogator 1, each responder 2 returns a response signal all at once. There is a problem of not progressing.

Therefore, Patent Document 2 is given as a conventional technique for solving such a problem. According to the prior art, a plurality of communication slots are set in order to return a response signal, and the responder that has received the activation signal returns a response signal in an arbitrary communication slot. As a result, collision of response signals is suppressed, and a large number of responders can be sequentially authenticated.
JP 2006-72706 A JP-A-11-205334

  Although the prior art of Patent Document 2 describes that a slot is randomly specified to avoid a collision of response signals, an ACK indicating that identification information (ID) has been authenticated from the interrogator to the responder. It is not shown how to send. If this ACK is not sent back, as long as the responder exists in the area of the interrogator, the response signal continues to be returned. As the number of responders increases, the number of collisions increases. That is, in the prior art of Patent Document 2, the interrogator simply performs a predetermined process, and if the predetermined process is performed, the responder does not respond any more. On the other hand, in the prior art of Patent Document 1, an ACK indicating that the identification information (ID) is authenticated by the second wireless communication method (UHF) is transmitted. There is a problem in that a UHF band receiving circuit is mounted and the cost increases.

  An object of the present invention is to provide a wireless authentication system capable of transmitting at low cost from an authentication device to a responder that the responder has been authenticated by the authentication device.

The wireless authentication system of the present invention includes an activation device, one or a plurality of responders, and an authentication device, wherein the activation device generates an induced magnetic field in a first wireless communication method, Wireless authentication that is activated in response to an induced magnetic field and transmits a response signal including identification information set individually in advance by the second wireless communication method, so that the authentication device authenticates the responder In the system, in the second wireless communication system, a plurality of communication slots are set during the generation period of the induction magnetic field in the first wireless communication system, and the responder is set in a randomly selected communication slot. A response signal is returned, and the authentication device causes the identification information of the authenticated responder to be transmitted in a superimposed manner on the induction magnetic field by the first wireless communication method that is subsequently transmitted by the activation device . The authenticated response And wherein the stopping responding vessels.

  According to the above configuration, the activation device applies an LF band signal, which is the first wireless communication method, to the coil to generate an induced magnetic field, and the responder receives the induced magnetic field by the coil and generates the electromotive force. The response signal including identification information (ID) set individually in advance by a signal in the UHF band which is the second wireless communication method, and the authentication device receives the response signal so that the response In the wireless authentication system using both the LF band and the UHF band for authenticating the device, in the first wireless communication method, the induction magnetic field is generated periodically, and a pause period in which the induction magnetic field is not generated is set. In the meantime, each responder responds in the second wireless communication system, and in the second wireless communication system, a plurality of communication slots are set in the idle period, and the responder selects a randomly selected communication. Own in slot Send another information. The activation device and the authentication device may be integrated to form an interrogator.

  Therefore, even when there are a large number of responders in the area of one activation device and authentication device, such as when used for room entry / exit management and product inventory management, the response from each responder It is possible to reduce the possibility of signal collision (suppress traffic) and to perform accurate authentication.

  Further, if each responder does not know that it has been authenticated by the authentication device, the response device continues to return the response signal as long as the induced magnetic field is detected. Send. Therefore, the responder in which transmission of its own identification information is detected stops replying of the response signal, so that traffic can be further reduced and authentication on the authentication device side can be further facilitated.

  Furthermore, since the identification information is transmitted by the modulation of the induced magnetic field by the first wireless communication system via the activation device, the UHF band signal of the second wireless communication system is transmitted to the responder side. There is no need to provide a receiver, and the cost can be reduced.

  The transmission of the identification information of the authenticated responder from the authentication device may be continued for a predetermined period, and may be stopped by a timeout process when a time that will be able to be sufficiently authenticated on the responder side has elapsed. Transmission may be stopped when a response signal (ACK) indicating that the identification information has been received is returned from the responder side.

  Also, in the wireless authentication system of the present invention, the identification information transmitted from the activation device is the individually set lower part without the upper common bit part.

  According to said structure, the packet length of the identification information to reply can be shortened, and identification information with respect to many responders is transmitted even if it is the said 1st radio | wireless communication system (LF) with few bit rates. Or it can continue to transmit identification information for one transponder for a long time to ensure reception.

  Furthermore, in the wireless authentication system of the present invention, the identification information transmitted from the activation device is a slot number used for transmission by the authenticated responder.

  According to said structure, an authentication apparatus transmits not the identification information (ID) of the authenticated responder but the slot number which the authenticated responder used for the reply as said identification information.

  Therefore, since a slot number having a packet length shorter than that of the identification information (ID) is transmitted, slot numbers for many responders are set even in the first wireless communication method (LF) having a low bit rate. It can be transmitted for a long time, or the slot number for one responder can continue to be transmitted and received reliably.

  Further, in the wireless authentication system of the present invention, a part of the plurality of communication slots in the second wireless communication system is set as a priority slot, and the responder returns the response signal a predetermined number of times, When the identification information of the first wireless communication method is not transmitted by being superimposed on the induction magnetic field, the response signal is transmitted again in the priority slot, and the number of replies is less than the predetermined number, The response signal is transmitted again in the remaining communication slots excluding the priority slot.

  According to the above configuration, even if the response signal is returned a predetermined number of times or more, the authentication apparatus itself is not authenticated (the confirmation bit (ACK) for notifying the completion of authentication is not received for the returned response signal) ), The responder returns a response signal in the priority slot, and otherwise returns the response signal in the remaining communication slots excluding the priority slot.

  Therefore, when the authentication is not performed, the authentication is completed preferentially over the responder newly entering the LF band activation area, so that it is possible to suppress the occurrence of authentication failure.

  Furthermore, in the wireless authentication system of the present invention, a priority slot is set in the second wireless communication system during the generation period of the induction magnetic field, and the responder returns the response signal in advance. The identification information is transmitted again in the priority slot when the identification information is not superimposed and transmitted on the induced magnetic field by the first wireless communication method within a predetermined time.

  According to the above configuration, even after a predetermined time has elapsed since the response signal was returned, the authentication device itself is not authenticated (the confirmation bit (ACK for notifying the completion of authentication for the returned response signal) ) Is not received), the responder returns a response signal in the priority slot. Since the frequency bands of the second wireless communication system and the first wireless communication system are separated, the reply in the priority slot does not affect the induced magnetic field.

  Therefore, if the authentication is not successful, a response signal is returned with priority over other responders for authentication, so that the occurrence of authentication failure can be suppressed. In addition to the priority slot, a response signal may be returned again with a part of the communication slot for returning a normal response signal as a priority slot. In this case, when the number of responders that have failed in authentication is larger than the number of slots that can be set during the induction magnetic field pause period, the probability of successful authentication is high, which is preferable.

  The wireless authentication system of the present invention includes an activation device, one or more responders, and an authentication device, wherein the activation device generates an induced magnetic field in a first wireless communication method, and the responder In response to the induced magnetic field, the authentication device authenticates the responder by transmitting a response signal including identification information set individually in advance using the second wireless communication method. In the wireless authentication system, in the second wireless communication system, a plurality of communication slots are set during the induction magnetic field generation period in the first wireless communication system, and the responder selects a communication slot selected at random. And the authentication device transmits the identification information of the authenticated responder superimposed on the induction magnetic field by the first wireless communication method that is subsequently transmitted by the activation device, and The responder is If the response signal including the identification information of itself is not transmitted after being transmitted a predetermined number of times, the identification information of the first wireless communication method is not superimposed and transmitted. An authentication device that transmits a transmission request signal by the second wireless communication method during transmission of the induction magnetic field by the first wireless communication method and receives the transmission request signal sends the authentication device to the activation device to the first wireless communication A transmission stop signal is superimposed on the induced magnetic field by the transmission method, and the response signal is returned by a responder other than the responder that has transmitted the transmission request signal.

  According to the above configuration, even if the response signal is returned a predetermined number of times or more, the authentication apparatus itself is not authenticated (the confirmation bit (ACK) for notifying the completion of authentication is not received for the returned response signal) ), The transponder transmits a transmission request signal by the second wireless communication method, and the authentication device that has received the transmission request signal causes the activation device to generate an induced magnetic field by the first wireless communication method. Then, the transmission stop signal is superimposed and transmitted, and the response signal is paused, that is, silenced by each responder that has received the transmission stop signal. Only the responder that has transmitted the transmission request signal returns the response signal.

  Therefore, the responder that has arrived in the area first, but the returned communication slot overlapped with another responder and failed to authenticate a predetermined number of times, transmits a transmission request signal. The slot becomes a priority slot and can be used only by itself, and the authentication apparatus can reliably receive the response signal.

  Furthermore, the wireless authentication system of the present invention includes an activation device, one or more responders, and an authentication device, and the activation device generates an induced magnetic field in a first wireless communication system, and the responder Is activated in response to the induced magnetic field, and transmits a response signal including identification information set individually in advance by the second wireless communication method, so that the authentication device authenticates the responder. In the wireless authentication system, in the second wireless communication system, a plurality of communication slots are set during the generation period of the induced magnetic field in the first wireless communication system, and the responder selects the communication selected at random. A response signal is returned in the slot, and the authentication device causes the identification information of the authenticated responder to be transmitted in a manner superimposed on the induction magnetic field by the first wireless communication method that is subsequently transmitted by the activation device, In addition In the wireless communication system, a control slot that is not used for returning the response signal is set, and the responder returns the first wireless signal even if the response signal including its own identification information is returned a predetermined number of times or more. When the identification information is not superimposed on the induced magnetic field by the communication method and transmitted, the transmission request signal is transmitted using the control slot, and the authentication device that receives the transmission request signal A device is characterized in that a transmission stop signal is superimposed on a magnetic field induced by the first wireless communication method and transmitted, and transmission of a response signal by a responder other than the responder that transmitted the transmission request signal is suspended. .

  According to the above configuration, even if the response signal is returned a predetermined number of times or more, the authentication apparatus itself is not authenticated (the confirmation bit (ACK) for notifying the completion of authentication is not received for the returned response signal) ), The transponder transmits a transmission request signal by the second wireless communication method, and the authentication device that has received the transmission request signal causes the activation device to generate an induced magnetic field by the first wireless communication method. Then, the transmission stop signal is superimposed and transmitted, and the response signal is paused, that is, silenced by each responder that has received the transmission stop signal. Only the responder that has transmitted the transmission request signal returns the response signal.

  Therefore, the communication slot that has arrived in the area first but has returned is overlapped with another responder, and the responder that has failed authentication a predetermined number of times transmits all transmission slots by transmitting a transmission request signal. Becomes a priority slot and can be used only by itself, and the authentication apparatus can reliably receive the response signal. Also, by using the control slot in the second wireless communication system for transmitting the transmission request signal, the transmission request signal is transmitted to the authentication device one cycle earlier than when transmitting in the next induction magnetic field generation cycle. be able to.

  In the wireless authentication system of the present invention, the authentication device detects a level of the response signal returned from each responder, and if the detected level is equal to or higher than a predetermined level, the authentication device , When the selection request signal is transmitted by superimposing the selection request signal on the induction magnetic field by the first wireless communication method, and when the responder itself meets the transmission permission condition by the selection request signal, The response signal is returned.

  According to the above configuration, the authentication apparatus monitors the level of the response signal returned from each responder from RF signal energy (for example, whether or not the RSSI value is equal to or higher than a predetermined level). If the response signal cannot be demodulated for one or a plurality of communication slots in the wireless communication system (UHF), but the response signal level is higher than a predetermined level, a response signal is returned in the communication slot. It is determined that there are too many responders, and a selection request signal is superimposed on the induced magnetic field by the first wireless communication method and transmitted. The selection request signal can be expressed using, for example, bit expression data in an existing default frame such as a unique word (UW), a priority ID, and a group ID. For example, when using the priority ID having a preferential access right, the responder side ID is made to respond, the even number is made to respond, or the responder side group ID is made to respond. This can be realized by specifying what value is to be responded. On the other hand, as a description condition of the selection request signal that does not use the bit representation data in the existing default frame, for example, whether the time from reaching the area (starting upon receiving an induced magnetic field) is a predetermined time or more Etc. can be set. The responder that has received the selection request signal returns the response signal when the responder itself matches the transmission permission condition.

  Therefore, it is possible to make a large number of responders perform selective responses (thinning out a large number of responders) to reduce traffic, and the concentration and arrival of responders more than initially assumed in the operation of the system. Even if the frequency increases, it is possible to monitor the response signal collision occurrence state and respond to the change in the situation.

  Furthermore, in the wireless authentication system of the present invention, the selection request signal is whether or not a battery remaining level is a predetermined value or more.

  According to the above configuration, in order to cause a large number of responders to perform a selection response and reduce traffic as described above, the selection request signal does not use the bit representation data in the existing default frame, but the selection request. As a signal description condition, it is assumed whether the remaining battery level is equal to or higher than a predetermined value.

  Therefore, a response signal is permitted to be given priority by giving priority to a battery with a low battery level. In other words, the authentication device side sends a reference remaining amount of data and silences any further responders. As a result, authentication failure due to battery exhaustion can be reduced.

  The wireless authentication system of the present invention includes an activation device, one or more responders, and an authentication device, wherein the activation device generates an induced magnetic field in a first wireless communication method, and the responder In response to the induced magnetic field, the authentication device authenticates the responder by transmitting a response signal including identification information set individually in advance using the second wireless communication method. In the wireless authentication system, in the second wireless communication system, a plurality of communication slots are set to be variable in the number of slots during the induction magnetic field generation period in the first wireless communication system, and the responder is randomly A response signal is sent back in the selected communication slot, and the authentication device superimposes the identification information of the authenticated responder on the induction magnetic field by the first wireless communication method that is subsequently transmitted by the activation device. When sending In addition, the number of communication slots to be used is determined according to the number of responders authenticated per predetermined time, and the data of the number of usable communication slots and the data of the slot ID are superimposed on the induction magnetic field and transmitted. In addition, an error determination bit is generated by using, as an error determination target bit, ID data corresponding to the usable slot in the slot ID data.

  According to the above configuration, the number of communication slots in which the responder returns the response signal is not fixed, and can be increased or decreased as appropriate. The authentication device generates the number of responders authenticated per predetermined time, that is, the generation of the response signal. Depending on the frequency and slot usage status, the greater the number of responders, the greater the number of communication slots to be used, and specify the maximum number of usable communication slots at each startup. An arbitrary communication slot is selected within the range of the maximum value, and a response signal is returned.

  Therefore, when the number of responders in the area is small, it is possible to shorten the response signal reception cycle from the transmission of the induced magnetic field, thereby improving the responsiveness to the arrival of a new responder in the area. When the number of responders is large, the number of communication slots is increased, and as many responders as possible can be authenticated in one cycle. In this way, it is possible to cope with changes in the frequency of arrival of the responders within the area and the number of simultaneous arrivals.

  In addition, when the authentication device makes the responder recognize the communication slot by the signal superimposed on the induction magnetic field, the variable number of slots as described above is transmitted as data of the number of usable communication slots, The communication slot ID data is also transmitted. The data to be actually transmitted includes a unique word, data such as the ID and time of the authentication device, and the slot ID is fixed length data including all slots. However, only the valid bits are actually subject to error determination, and the slot ID is not limited to all slots but only usable slots.

  Therefore, by removing meaningless bits corresponding to ID data of unused slots from error detection targets, the possibility of frame errors can be reduced and the occurrence of frame discard can be reduced.

  In the wireless authentication system of the present invention, the activation device and the authentication device constitute an interrogator, the interrogator superimposes the activation signal on a signal component of an induced magnetic field, and a control circuit that generates the activation signal. An LF band transmission circuit and an LF antenna for transmitting to the responder in the first wireless communication system; and an RF antenna and an RF receiving circuit for receiving the response signal from the responder and supplying the response signal to the control circuit. The responder is activated by the LF antenna and the LF band receiving circuit that receives the activation signal from the interrogator, the built-in battery, and the received activation signal, and has a unique identification set in advance. A control circuit that generates a response signal including information, an RF transmission circuit that uses the built-in battery as a power source, and returns the response signal to the interrogator in the second wireless communication method; Characterized in that it comprises a container.

  According to the above configuration, the interrogator starts the responder with the electromotive force of the LF band (long wave band: 30 to 300 kHz), and the control circuit on the responder side causes the RF transmitter circuit to use the built-in battery as the power source. By returning a response signal in the UHF band (ultra-high frequency band: 300 MHz to 3 GHz), even if the power consumption of the RF transmission circuit in the UHF band is as large as 10 to 20 mA, the LF band receiving circuit in the LF band is several μA. Therefore, it is possible to reduce the power consumption of the built-in battery and extend the life of the responder while realizing a relatively long-distance communication by not using the RF transmission circuit in the standby state. be able to.

  Further, for the UHF band, the responder side is a one-way communication only for transmission, and the identification information of the responder indicating that the authentication is completed on the interrogator side is a transmission frame after the next time of the activation signal. Therefore, the RF receiver circuit is not required on the responder side, and the cost can be reduced.

  In the wireless authentication system of the present invention, as described above, the activation device applies an LF band signal, which is the first wireless communication method, to the coil to generate an induced magnetic field, and the responder receives the induced magnetic field with the coil. Then, it starts with the electromotive force, returns a response signal including identification information (ID) individually set in advance with a UHF band signal that is the second wireless communication method, and the authentication device receives the response signal. Thus, in the wireless authentication system using both the LF band and the UHF band for authenticating the responder, in the first wireless communication system, the induction magnetic field is periodically generated, and the induction magnetic field is not generated. In the meantime, each responder responds in the second wireless communication system, and in the second wireless communication system, a plurality of communication slots are set in the pause period, Randomly selected communication It sends its identification information in the lot.

  Therefore, even when there are a large number of responders in the area of one activation device and authentication device, such as when used for room entry / exit management and product inventory management, It is possible to reduce the possibility of collision of response signals (suppress traffic) and enable accurate authentication. In addition, since the authentication device transmits the identification information of the authenticated response device, the response device in which the transmission of the identification information of the authentication device is detected stops the reply of the response signal, so that the traffic is further reduced, and the authentication device side It is possible to make it easier to authenticate with. Furthermore, since the identification information is transmitted by the modulation of the induced magnetic field by the first wireless communication system via the activation device, the UHF band signal of the second wireless communication system is transmitted to the responder side. There is no need to provide a receiver, and the cost can be reduced.

  Further, as described above, the wireless authentication system of the present invention uses the identification information as the individually set lower portion excluding the upper common bit portion.

  Therefore, the packet length of the identification information to be returned can be shortened, and the identification information for many responders can be transmitted even in the first wireless communication system (LF) with a low bit rate. Alternatively, the identification information for one responder can be continuously transmitted for a long time to be surely received.

  Furthermore, as described above, the wireless authentication system of the present invention uses the identification information as the slot number used for transmission by the authenticated responder.

  Therefore, since the slot number whose packet length is shorter than the identification information (ID) is transmitted, even in the first wireless communication system (LF) with a small bit rate, the slot numbers for many responders are transmitted. Or the slot number for one responder can continue to be transmitted and received reliably for a long time.

  Also, as described above, the wireless authentication system of the present invention sets a part of the plurality of communication slots in the second wireless communication system as priority slots, and the responder sets the response signal a predetermined number of times or more. If the identification information is not superimposed and transmitted on the induced magnetic field by the first wireless communication method even if the reply is made, a response signal is transmitted again in the priority slot and less than the predetermined number of times. The response signal is transmitted again in the remaining communication slots excluding the priority slot.

  Therefore, if the authentication device itself is not authenticated even after a predetermined time has elapsed since the response signal is returned, it is given priority over the responder newly entering the LF band activation area. Since the authentication is completed, it is possible to suppress the occurrence of authentication omission.

  Furthermore, as described above, the wireless authentication system of the present invention sets a priority slot in the second wireless communication system during the induction magnetic field generation period, and the responder returns the response signal. Then, if the identification information is not superimposed and transmitted on the induced magnetic field by the first wireless communication method within a predetermined time, the identification information is transmitted again in the priority slot.

  Therefore, if the authentication device itself is not authenticated even after a predetermined time has elapsed since the response signal is returned, the response signal is returned with priority over other responders and authenticated. Therefore, the occurrence of authentication omission can be suppressed.

  Further, as described above, when the wireless authentication system of the present invention does not authenticate itself on the authentication device side even if a response signal is returned a predetermined number of times or more, the responder is configured to use the first wireless communication system. During transmission of the induced magnetic field by the authentication device, the authentication device that transmits the transmission request signal by the second wireless communication method and receives the transmission request signal causes the activation device to change the induced magnetic field to the induced magnetic field by the first wireless communication method. Then, the transmission stop signal is superimposed and transmitted, and the response signal is paused, that is, silenced by each responder that has received the transmission stop signal. Only the responder that has transmitted the transmission request signal returns the response signal.

  Therefore, the responder that has arrived in the area first, but the returned communication slot overlapped with another responder and failed to authenticate a predetermined number of times, transmits all the transmission request signals. The communication slot becomes a priority slot and can be used only by itself, and the authentication apparatus can reliably receive the response signal.

  Furthermore, as described above, in the wireless authentication system of the present invention, when the authentication apparatus itself is not authenticated even if a response signal is returned a predetermined number of times or more, the responder receives the second wireless communication. An authentication device that transmits a transmission request signal using a control slot that is set to a method and is not used for returning the response signal, and receives the transmission request signal, guides the activation device to the activation device by the first wireless communication method. The transmission stop signal is superimposed on the magnetic field and transmitted, and each responder that has received the signal stops responding the response signal, that is, silences it. Only the responder that has transmitted the transmission request signal returns the response signal.

  Therefore, the responder that has already arrived in the area but returned the communication slot overlaps with another responder, and the responder that failed to authenticate a predetermined number of times transmits all transmission requests. The slot becomes a priority slot and can be used only by itself, and the authentication apparatus can reliably receive the response signal. Also, by using the control slot in the second wireless communication system for transmitting the transmission request signal, the transmission request signal is transmitted to the authentication device one cycle earlier than when transmitting in the next induction magnetic field generation cycle. be able to.

  In the wireless authentication system of the present invention, as described above, the authentication device monitors the level of the response signal returned from each responder from the RF signal energy, and the second wireless communication system (UHF). If the response signal cannot be demodulated for one or more communication slots in (1), but the response signal level is equal to or higher than a predetermined level, there are too many responders that returned response signals in that communication slot. It is determined that the selection request signal is superimposed on the induction magnetic field by the first wireless communication method and transmitted.

  Therefore, it is possible to reduce the traffic by making a large number of responders perform selective responses (thinning a large number of responders), and to increase the concentration of responders more than originally assumed in the operation of the system. Even if the arrival frequency increases, it is possible to monitor the response signal collision occurrence state and respond to the change in the situation.

  Furthermore, as described above, the wireless authentication system of the present invention determines whether the remaining battery level is equal to or higher than a predetermined value as the description condition of the selection request signal.

  Therefore, the reply permission of the response signal is given with priority given to the one with the remaining battery level and the other responders are silenced, so that the authentication omission due to the battery exhaustion can be reduced.

  Further, as described above, the wireless authentication system of the present invention can appropriately increase / decrease the number of communication slots to which the responder returns a response signal, and the authentication device can determine the number of responders authenticated per predetermined time, that is, Depending on the frequency of response signal generation and slot usage, the greater the number of responders, the greater the number of communication slots to be used, and specify the maximum number of communication slots that can be used each time it is activated. Since the transponder selects an arbitrary communication slot within the range of the maximum value and returns a response signal, when the number of responders in the area is small, the response signal reception cycle is shortened from the transmission of the induced magnetic field. The response to arrival of new responders in the area can be improved, and when there are a large number of responders in the area, the number of communication slots can be increased and one cycle can be achieved. It is possible to authenticate the number of responder. In this way, it is possible to cope with changes in the frequency of arrival of the responders within the area and the number of simultaneous arrivals.

  Also, when making the responder recognize the communication slot, the variable number of slots is transmitted as data of the number of usable communication slots, and the ID data of each communication slot is also fixed-length data including all slots Since the target of error determination is limited to the usable slot, the meaningless bit corresponding to the ID data of the unused slot is excluded from the error detection target, thereby reducing the possibility of frame error and Occurrence of destruction can be reduced.

  In the wireless authentication system of the present invention, as described above, the activation device and the authentication device constitute an interrogator, the interrogator includes a control circuit that generates an activation signal, and the activation signal as a signal of an induced magnetic field. An LF band transmission circuit and an LF antenna that are superimposed on components and transmitted to the responder in the first wireless communication system, and an RF antenna and an RF that receive the response signal from the responder and give the response signal to the control circuit The responder is configured to be activated and preset by the LF antenna and LF band receiving circuit for receiving the activation signal from the interrogator, a built-in battery, and the received activation signal. A control circuit that generates a response signal including unique identification information, and an RF transmission circuit that uses the built-in battery as a power source and returns the response signal to the interrogator in the second wireless communication system And including an RF antenna.

  Therefore, by not using the RF transmission circuit in the standby state, the LF band, UHF, which can reduce the power consumption of the built-in battery and extend the life of the responder while realizing a relatively long distance communication. A wireless authentication system using a band can be realized. Further, for the UHF band, the responder side is a one-way communication only for transmission, and the identification information of the responder indicating that the authentication is completed on the interrogator side is a transmission frame after the next time of the activation signal. Therefore, the RF receiver circuit is not required on the responder side, and the cost can be reduced.

[Embodiment 1]
FIG. 1 is a block diagram showing an electrical configuration of the wireless authentication system according to the first embodiment of the present invention. The wireless authentication system includes an interrogator 31 that constitutes the activation device and the authentication device, and includes one or a plurality of responders 32 including IC tags. The activation device and the authentication device are separated from each other. It may be said. This wireless authentication system is a wireless authentication system that uses both the LF band and the UHF band, and is used, for example, for entrance / exit management of the room 3 as shown in FIG.

  The interrogator 31 superimposes and amplifies the activation signal generated by the control circuit 41 on the signal component of the induced magnetic field in the LF band transmission circuit 42, and responds from the LF antenna 43 by the first wireless communication method (LF). Broadcasting is repeated periodically toward the device 32. As a result, the authentication area 5 as shown in FIG. 16 is formed around the interrogator 32, and the responder 32 possessed by the user 6 or the like who has entered the authentication area 5 receives the information from the interrogator 31. After the activation signal is received by the LF antenna 51, the LF band reception circuit 52 activates the control circuit 53. The control circuit 53 uses the built-in battery 56 as a power source and has its own unique identification information (ID ) Is generated and returned to the interrogator 31 by the second wireless communication method (UHF) from the RF transmission circuit 54 via the RF antenna 55.

  The response signal is received by the RF receiving circuit 45 from the RF antenna 44 of the interrogator 31 and input to the control circuit 41 to identify the responding responder. If the identified responder has identification information registered in advance such as a user ID or a group ID, the control circuit 41 indicates that the authentication is completed by the display unit 46 and the buzzer 48 and at the same time unlocks the door 4. I do.

  In this way, the responder 32 is activated by the electromotive force in the LF band (long wave band: 30 to 300 kHz), and the control circuit 53 uses the built-in battery 56 as the power source for the RF transmission circuit 54, and the UHF band (ultra high frequency band: By returning a response signal of 300 MHz to 3 GHz, the authentication area 8 can be accurately defined in a relatively narrow range of 1.5 to 2 m, and the power consumption of the RF transmission circuit 54 in the UHF band is reduced. Even if it is as large as 10 to 20 mA, the LF band reception circuit 52 of the LF band is activated with a weak power of several μA, so that the power consumption of the built-in battery 56 is suppressed by not using the RF transmission circuit 54 in the standby state. The service life of the responder 32 is extended.

  It should be noted that in the present embodiment, the RF transmitter circuit 54 is provided on the responder 32 side and the RF receiver circuit 45 is provided on the interrogator 31 side with respect to the UHF band, and communication in the reverse direction is not performed. One-way communication. Instead, the control circuit 41 of the interrogator 31 includes the identification information (ID) of the responder 32 that has completed authentication as an ACK signal in the next transmission frame of the activation signal, and the LF band transmission circuit 42 generates an induced magnetic field. Is transmitted to the responder 32 by the first wireless communication method (LF). When the ACK signal is received by the LF band receiving circuit 52 from the LF antenna 51, the control circuit 53 displays on the display unit 57 and ends the transmission of the response signal.

  When the user does not know whether the user has entered the authentication area 5 and wants to authenticate at an early stage, the control circuit 53 activates the LF band receiving circuit 52 by operating the operation switch 58, and the activation signal Is forcibly received.

  FIG. 2 is a diagram for explaining the configuration of the LF band activation signal and the communication operation between the interrogator 31 and the responder 32. As shown in FIG. 2, the interrogator 31 transmits one or a plurality of frames of the LF band activation signals S1 and S2 together with the induction magnetic field, and repeatedly performs the above-described periodic transmission that pauses for a predetermined period. Yes. In the idle period, a plurality of communication slots are set as RF reply slots, and the control circuit 53 of each responder 32 identifies itself in a randomly selected communication slot as shown in FIG. A response signal including information (ID) is returned. In the example of FIG. 2, in the first cycle SL1, the ID1 responder returns in slot 1, and the ID2 responder returns in slot 6. In the next second cycle SL2, the ID3 responder returns in slot 4.

  On the other hand, as shown in FIG. 2, the LF band activation signals S1 and S2 are followed by a unique word, header, and data following the preamble portion, and the data is followed by the ID of the communication slot (example of FIG. 2). Is stored for 7). Each responder 32 performs timing adjustment in the preamble portion, and returns the response signal at the timing of the target communication slot according to the slot ID. When the response signal is authenticated, the control circuit 41 of the interrogator 31 transmits the identification information of the authenticated responder as an ACK signal following the data part in the start signal of the next cycle. At the end of the activation signals S1, S2, an error correction code for the entire length of the activation signals S1, S2 is added.

  With this configuration, the responder 32 first sends back a response signal in a randomly selected communication slot, so that one unit can be used as in entrance / exit management or product inventory management. Even when a large number of responders 32 exist in the authentication area 5 of the interrogator 31, the possibility of collision of response signals from the responders 32 is reduced (traffic is suppressed), and the interrogator 31 can be authenticated accurately. Can be.

  Next, if each responder 32 does not know that it has been authenticated by the interrogator 31, it will continue to send back the response signal as long as the activation signals S1 and S2 are detected by the LF band receiving circuit 52. The interrogator 31 transmits the identification information of the authenticated responder 32. Therefore, since the responder in which transmission of its own identification information is detected stops returning the response signal, traffic can be further reduced and authentication on the interrogator 31 side can be further facilitated.

  Furthermore, since the authenticated identification information is transmitted by the activation signals S1 and S2 by the first wireless communication method (LF), the second wireless device whose power consumption differs by 3 to 4 digits is placed on the responder 32 side. It is not necessary to provide a receiver for UHF band signals, which is a communication method, and the cost can be reduced.

  Note that the transmission of the identification information from the interrogator 31 is not only included in the next transmission frame of the activation signal as described above, but also continues for a predetermined period, and a time during which the responder 31 can sufficiently authenticate. The time-out process may be stopped when the time elapses, or transmission may be stopped when a response signal (ACK) indicating that the ID is received is returned from the responder 31 side.

[Embodiment 2]
FIG. 3 is a diagram for explaining the configuration of the LF band activation signal and the communication operation between the interrogator and the responder in the wireless authentication system according to the second embodiment of the present invention. In the present embodiment, the configuration of the wireless authentication system shown in FIG. 1 can be used. It should be noted that in this wireless authentication system, the identification information of the authenticated responder 32 included in the activation signal S1a. However, the upper common bit portion is omitted and only the lower bit data ID1a and ID2a individually set in each responder 32 are included.

  With this configuration, the packet length of identification information to be returned can be shortened, and identification information for many responders 32 can be obtained even in the first wireless communication system (LF) with a low bit rate. The identification information for one responder 32 can be transmitted for a long time, and can be reliably received.

[Embodiment 3]
FIG. 4 is a diagram for explaining the configuration of the LF band activation signal and the communication operation between the interrogator and the responder in the wireless authentication system according to the third embodiment of the present invention. In this embodiment, the same configuration as that of the wireless authentication system shown in FIG. 1 can be used, which is similar to the communication operation in the wireless authentication system shown in FIG. It should be noted that in this wireless authentication system, as the identification information of the responder 32 authenticated by the interrogator 31 included in the activation signal S1b, the authenticated responder 32 is not the identification information (ID) of the responder 32. Is to use the slot number used for the reply.

As shown in FIG. 4 , the slot number is represented by a list of 1-bit data indicating whether or not each slot has been successfully authenticated, or the slot number itself of the slot that has been successfully authenticated (7 in FIG. 4 ). Any format can be used as long as the data amount is small, such as 3 bits if it is one slot), and it is easy to compare with the slot used by the responder 32. Good.

  By configuring in this way, what is transmitted is a slot number whose packet length is shorter than the identification information (ID). Therefore, even in the first wireless communication system (LF) with a low bit rate, The slot number for the responder 32 can be transmitted, or the slot number for one responder 32 can continue to be transmitted for a long period of time to ensure reception.

[Embodiment 4]
FIG. 5 is a diagram for explaining the communication operation between the interrogator and the responder in the wireless authentication system according to the fourth embodiment of the present invention. In this embodiment, the same configuration as that of the above-described wireless authentication system shown in FIG. 1 can be used. It should be noted that in this wireless authentication system, a part of the plurality of communication slots (example of FIG. 5). 1 to 3) are set as priority slots, and even if the control circuit 53 of each responder 32 replies the response signal a predetermined number of times or more, the identification signal is superimposed on the activation signal. If not transmitted (in the example of FIG. 5, the ID1 responder that has failed multiple times collides with the ID2 responder in slot 6), the priority slot (in the example of FIG. 1), the response signal is transmitted again, and in the number of replies less than the predetermined number (in the example of FIG. 5, ID2 and ID3 responders), the normal communication slots (except for the priority slots (1 to 3)) ( In the example of FIG. It is to transmit the response signal again respectively 6,4). The threshold value of the number of times the response signal is retransmitted by the responder 32 may be set in a range in which response delay does not become a problem, for example, three times, depending on the number of communication slots, the cycle period, and the like.

  With this configuration, even if a response signal is returned a predetermined number of times or more, the interrogator 31 does not authenticate itself (the confirmation bit (ACK) for notifying the completion of authentication for the returned response signal). If it is not received), the responder returns a response signal in the priority slot, so that the authentication is completed preferentially over the responder newly entering the authentication area 5. Can be suppressed.

[Embodiment 5]
FIG. 6 is a diagram for explaining the configuration of the LF band activation signal and the communication operation between the interrogator and the responder in the wireless authentication system according to the fifth embodiment of the present invention. Also in this embodiment, the same configuration as that of the wireless authentication system shown in FIG. 1 can be used, which is similar to the communication operation in the wireless authentication system shown in FIG. It should be noted that the priority slot in the second wireless communication system is set during the generation period of the activation signal.

  Accordingly, after the response signal is returned (ID1 and ID2 responders in the example of FIG. 6), the interrogator 31 is not authenticated even after a predetermined time has elapsed (in the example of FIG. 6, immediately after The confirmation signal (ACK) for notifying the completion of authentication is not received by the activation signal S1b), and the responder receives the activation signal during the next activation signal (S2b in the example of FIG. 6). Regardless of whether or not, a response signal is returned in the priority slot (in the example of FIG. 6, ID2 and ID1 are in this order, and also in the priority slot). Since the frequency bands of the second wireless communication system and the first wireless communication system are separated, the reply in the priority slot does not affect the activation signal. In addition, the priority slot is a relationship between a period until each responder 32 receives an activation signal and activation (wake-up) is completed, a transmission speed in the second wireless communication system, and a data length to be transmitted. Thus, as shown in FIG. 6, it may be composed of a plurality of slots.

  By configuring in this way, when authentication is not performed, a response signal is returned with priority over other responders so as to be authenticated, so that the occurrence of authentication failure can be suppressed.

[Embodiment 6]
FIG. 7 is a diagram for explaining the communication operation between the interrogator and the responder in the wireless authentication system according to the sixth embodiment of the present invention. Also in this embodiment, the same configuration as that of the wireless authentication system shown in FIG. 1 can be used, which is similar to the communication operation in the wireless authentication system shown in FIGS. It should be noted that after replying the response signal (ID1 and ID2 responders in the example of FIG. 7), if the interrogator 31 is not authenticated even after a predetermined time has elapsed, the responder The response signal is retransmitted in the priority slot (slots B and A in the example of FIG. 7 respectively) and is also retransmitted in the normal communication slots (slots 1 and 6 in the example of FIG. 7 respectively). .

  With this configuration, when the number of responders that have failed in authentication is greater than the number of slots that can be set in the idle period of the activation signal, the authentication success probability increases, which is preferable.

[Embodiment 7]
FIG. 8 is a diagram for explaining the communication operation between the interrogator and the responder in the wireless authentication system according to the seventh embodiment of the present invention. In this embodiment, the same configuration as that of the wireless authentication system shown in FIG. 1 can be used. It should be noted that even if the control circuit 53 of the responder 32 returns a response signal including the identification information of the responder 32 a predetermined number of times or more, the control circuit 53 of the responder 32 receives the identification signal of the activation signal by the first wireless communication method. When information is not included (in the example of FIG. 8, ID1 and ID2 responders), during transmission of the activation signal S3, the transmission request signal RTS is transmitted by the second wireless communication method, and the transmission request signal is transmitted. The control circuit 41 of the interrogator 31 that has received the RTS transmits a response signal other than the responder that transmitted the transmission request signal RTS by transmitting the activation signal S4 according to the first wireless communication method including the transmission stop signal CTS. In the example of FIG. 8, the response signal response by the ID3 responder) is paused.

  Specifically, as the transmission stop signal CTS, for example, a transmission control bit of 2 bits is defined in the data portion in the activation signal S1 shown in FIG. 1, and when the transmission control bit is 0, transmission is performed. If no response is made, that is, all the responders can respond and the transmission control bit is 1, only the responder for which the response signal is transmitted for the first time is suspended, and the transmission control bit is 2. In some cases, transmission of responders other than the responder that transmitted the transmission stop signal CTS is prohibited for a predetermined period or until the transmission stop signal CTS is canceled.

  If there are a large number of responders 32 in the authentication area 5, the transmission request signal RTS may be generated at the same time. In such a case, the transmission of the transmission request signal RTS is possible. A plurality of slots may be set, and each responder may transmit in a randomly selected slot. As a result, when the reception power of the transmission request signal RTS is detected in any slot (even if the transmission request signal RTS cannot be correctly demodulated), any responder transmits the transmission request signal RTS. If the transmission request signal RTS can be normally received in each slot by applying a slight restriction such as setting the transmission control bit to 1 in the next transmission stop signal CTS, the transmission request signal RTS can be received. Since the number of responding slots transmitting the transmission request signal RTS is equal to the number of responders, even if control is performed such that the transmission control bit of the next transmission stop signal CTS is set to 2 according to the number, the control is strengthened. Good.

  By configuring in this way, the responder that has arrived in the authentication area 5 first, but the returned communication slot overlaps with another responder, and has failed authentication a predetermined number of times, the transmission request signal RTS , All communication slots become priority slots and can be used only by themselves, that is, other responders that have received the transmission stop signal CTS can be silenced, and the interrogator 31 responds. The signal can be reliably received.

[Embodiment 8]
FIG. 9 is a diagram for explaining the communication operation between the interrogator and the responder in the wireless authentication system according to the eighth embodiment of the present invention. Also in this embodiment, the same configuration as the wireless authentication system shown in FIG. 1 can be used, which is similar to the communication operation in the wireless authentication system shown in FIG. It should be noted that a part of the communication slot (slot 0 in the example of FIG. 9) in the second wireless communication system during the activation signal is not used for returning a response signal, and the transmission request signal RTS is accepted. It is set to a dedicated control slot.

  Even in this case, the responder that has arrived at the authentication area 5 first but has returned the communication slot overlaps with another responder, and has failed the authentication a predetermined number of times, transmits the transmission request signal RTS. As a result, all communication slots become priority slots and can be used only by themselves, and the interrogator 31 can reliably receive a response signal. Further, by using the control slot in the second wireless communication system for transmitting the transmission request signal RTS, the transmission request signal is sent to the interrogator 31 one cycle earlier than in the case of transmitting in the generation cycle of the next activation signal S5. RTS can be sent.

[Embodiment 9]
FIG. 10 is a block diagram showing an electrical configuration of the interrogator 31a in the wireless authentication system according to the ninth embodiment of the present invention. This interrogator 31a is similar to the interrogator 31 shown in FIG. 1 described above, and corresponding portions are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, the responder 32 can use the configuration shown in FIG. It should be noted that in this embodiment, the RF receiving circuit 45a of the interrogator 31a includes a detector 61 and a demodulator 62 that demodulate the response signal from the RF antenna 44, and the RSSI value of the detector 61. Is provided with an output determination unit 63 for determining whether or not a response signal is transmitted based on whether or not the signal is above a predetermined level. Then, as shown in FIG. 11, the control circuit 41a sets the selection request signal as the next activation signal based on whether or not the response signal is normally demodulated and whether or not the transmission power of the response signal is detected. Including the transmission from the LF band transmission circuit 42.

  Specifically, when the response signal is normally demodulated (slot 5 in the example of FIG. 11), and when the response signal is not demodulated normally and the transmission power of the response signal is not detected (in the example of FIG. 11) In slot 4), when a selection request is not made or is maintained as it is and transmission power of the response signal is detected, the response signal is not demodulated normally (in the example of FIG. 11, slots 1 to 3). , 6 and 7), it is determined that there are too many responders that have returned response signals in the communication slot, and the selection request is made or is made stricter than the present situation. The responder that has received the selection request signal returns the response signal when the responder itself matches the transmission permission condition by the selection request signal. Even when the response signals collide, since the RF signal energy (RSSI value) can be detected, it can be detected that there is a transmission from the responder.

  The selection request signal can be expressed by using, for example, bit representation data in an existing default frame such as a unique word (UW), a priority ID, and a group ID, and the responder 32 uses the bit representation data for the response. Authenticates that signal transmission should be restricted.

  For example, when the priority ID having a preferential access right like the activation signal S11 shown in FIG. 12A is used, the priority ID is as shown in the activation signal S12 shown in FIG. First, the transmission permission mode is set to a bit array corresponding to the even / odd mode designation, and the subsequent bits are designated as odd or even so that the ID on the responder 32 side is odd. It is possible to specify whether to make a response (priority) or to make an even number respond (priority).

  Further, as in the activation signal S13 shown in FIG. 12 (c), the transmission permission mode is set to a bit array corresponding to the group mode designation, and the value of the group ID on the side of the responder 32 is the bit following it. Whether to respond (priority) can be specified. Furthermore, a transmission / non-prohibited terminal may be designated using a priority class ID as a priority ID as in the activation signal S14 shown in FIG. In this case, each responder 32 is classified into communication priorities in advance.

  Further, the responder designated as the priority ID may be set not to respond, that is, the responder not designated may be set to respond, and the designated responder responds and is not designated. The responder may determine whether to respond or not.

  On the other hand, as a description condition of the selection request signal that does not use the bit expression data in the existing default frame, for example, a time from reaching the authentication area 5 (starting up by receiving an induced magnetic field) is a predetermined time or more. It can be set to whether or not.

  In this way, the interrogator 31a has a function of managing the response frequency and the number of responses of the responder 32, and allows a large number of responders to perform selective responses (thinning out the large number of responders), Traffic can be reduced. As a result, even if the arrival of the responders and the arrival frequency increase more than originally assumed in the operation of the system, the occurrence status of the response signal collision can be monitored and the change of the situation can be dealt with.

  Furthermore, in the activation signal S15 shown in FIG. 12E, the remaining battery level is used as the priority ID. The responder that has received such a selection request signal pauses the response signal when the remaining capacity of its internal battery 56 is equal to or higher than the level specified by the remaining battery level ID, and when it is less Reply.

  With this configuration, as described above, a large number of responders 32 perform selection responses, and when reducing traffic, priority is given to the ones with a small remaining battery level to give a response signal reply permission. The device 31 side sends the reference remaining amount of data and silences any more responders, thereby reducing authentication omission due to battery exhaustion.

[Embodiment 10]
FIG. 13 is a diagram for explaining a configuration of the activation signal of the LF band in the wireless authentication system according to the tenth embodiment of the present invention. In this embodiment, the same configuration as that of the wireless authentication system shown in FIG. 1 can be used. It should be noted that in the present embodiment, the number of communication slots of the response signal in the second wireless communication system is variable, and the control circuit 41 of the interrogator 31 recognizes the presence at a predetermined time. According to the number of responders 32 (response frequency) and the number of collisions obtained as shown in FIG. 11, the number of communication slots to be used is determined and included in the activation signal for transmission.

  That is, in the activation signal S21 of FIG. 13, after the number of slots currently in use is defined by SLOT-MAX, the slot number is transmitted by SLOT-ID in order to send back a slot that has been authenticated as ACK. The number of communication slots to be used increases as the response frequency number of the responder 32 increases (the number of empty slots decreases) and the number of collisions (slots that cannot be demodulated) increases.

  With this configuration, when the number of responders 32 in the authentication area 5 is small, the response signal reception cycle is shortened from the transmission of the activation signal, and a new responder arrives in the authentication area 5. In addition, when the number of responders in the authentication area 5 is large, the number of communication slots is increased, and as many responders as possible can be authenticated in one cycle. In this way, it is possible to cope with changes in the frequency of arrival of the responders within the area and the number of simultaneous arrivals.

[Embodiment 11]
FIG. 14 is a diagram for explaining the configuration of the LF band activation signal in the wireless authentication system according to the eleventh embodiment of the present invention. This embodiment can also use the same configuration as the wireless authentication system shown in FIG. 1 and is similar to the activation signal shown in FIG. It should be noted that in the activation signal S22 of the present embodiment, the frame length of the activation signal S22 is fixed, for example, of the 2-byte slot ID data SLOT-ID, ID data defined by the SLOT-MAX The error determination bit CRC is generated using the above as the bits for error determination.

  In this way, by removing meaningless bits corresponding to ID data of unused slots from error detection targets, the possibility of frame errors can be reduced and the occurrence of frame discard can be reduced.

  In Japanese Patent Laid-Open No. 11-205334, response is first improved by responding in the first slot, and in the event of a collision, response is made in any of the following slots. Thus, it is described that the collision is avoided. However, there is no description regarding the response after being received. Therefore, when the interrogator replies that the interrogator has received the second wireless communication method (UHF) (ACK) as normally considered, each responder has a receiver for receiving the response as the first wireless communication method. (LF) receiver must be attached.

1 is a block diagram showing an electrical configuration of a wireless authentication system according to a first embodiment of the present invention. It is a figure for demonstrating the communication operation | movement of the structure of the starting signal and the interrogator and responder in the radio | wireless authentication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the structure of the starting signal in the radio | wireless authentication system which concerns on the 2nd Embodiment of this invention, and the communication operation of an interrogator and a responder. It is a figure for demonstrating the structure of the starting signal in the radio | wireless authentication system which concerns on the 3rd Embodiment of this invention, and the communication operation of an interrogator and a responder. It is a figure for demonstrating the communication operation of the interrogator and responder in the radio | wireless authentication system which concerns on the 4th Embodiment of this invention. It is a figure for demonstrating the structure of the starting signal in the radio | wireless authentication system which concerns on the 5th Embodiment of this invention, and the communication operation of an interrogator and a responder. It is a figure for demonstrating the communication operation of the interrogator and responder in the radio | wireless authentication system which concerns on the 6th Embodiment of this invention. It is a figure for demonstrating the communication operation of the interrogator and responder in the radio | wireless authentication system which concerns on the 7th Embodiment of this invention. It is a figure for demonstrating the communication operation of the interrogator and responder in the radio | wireless authentication system which concerns on the 8th Embodiment of this invention. It is a block diagram which shows the electric constitution of the interrogator in the radio | wireless authentication system which concerns on the 9th Embodiment of this invention. It is a figure for demonstrating operation | movement of the interrogator in the radio | wireless authentication system which concerns on the 9th Embodiment of this invention. It is a figure for demonstrating the structure of the starting signal in the radio | wireless authentication system which concerns on the 9th Embodiment of this invention. It is a figure for demonstrating the structure of the starting signal in the radio | wireless authentication system which concerns on the 10th Embodiment of this invention. It is a figure for demonstrating the structure of the starting signal in the radio | wireless authentication system which concerns on the 11th Embodiment of this invention. It is a block diagram which shows the typical prior art of a radio | wireless authentication system. It is a figure for demonstrating the example where the said radio | wireless authentication system is used for entrance / exit management of a room. It is a figure for demonstrating the authentication procedure in the radio | wireless authentication system of a prior art.

3 room 4 door 5 authentication area 31, 31a interrogator 32 responder 41, 41a, 53 control circuit 42 LF band transmission circuit 43 LF antenna 44 RF antenna 45, 45a RF reception circuit 46, 57 display unit 48 buzzer 51 LF antenna 52 LF band receiving circuit 54 RF transmitting circuit 55 RF antenna 56 Built-in battery 61 Detector 62 Demodulator 63 Output judging device

Claims (11)

An activation device, one or a plurality of responders, and an authentication device, wherein the activation device generates an induced magnetic field in a first wireless communication method, and the responder is activated in response to the induced magnetic field In the wireless authentication system in which the authentication device authenticates the responder by transmitting a response signal including identification information set individually in advance in the second wireless communication method.
In the second wireless communication system, a plurality of communication slots are set during the generation period of the induced magnetic field in the first wireless communication system, and the responder transmits a response signal in a randomly selected communication slot. Reply,
The authentication device superimposes and transmits the identification information of the authenticated responder on the induced magnetic field by the first wireless communication method that the activation device transmits later, so that the authenticated responder A wireless authentication system characterized by stopping a response .   2. The wireless authentication system according to claim 1, wherein the identification information transmitted from the activation device is the individually set lower portion without the upper common bit portion.   2. The wireless authentication system according to claim 1, wherein the identification information transmitted from the activation device is a slot number used for transmission by the authenticated responder.   A part of the plurality of communication slots in the second wireless communication system is set as a priority slot, and the responder returns the response signal a predetermined number of times or more, and the induced magnetic field by the first wireless communication system In addition, when the identification information is not superimposed and transmitted, the response signal is transmitted again in the priority slot, and when the number of replies is less than the predetermined number, the remaining communication slots excluding the priority slot are used. The wireless authentication system according to claim 1, wherein the response signal is transmitted again.   During the generation period of the induction magnetic field, a priority slot is set in the second wireless communication system, and the responder returns the response signal to the first wireless communication system within a predetermined time. The identification information is transmitted again in the priority slot when the identification information of the device itself is not superimposed and transmitted on the induced magnetic field of claim 1. Wireless authentication system. An activation device, one or a plurality of responders, and an authentication device, wherein the activation device generates an induced magnetic field in a first wireless communication method, and the responder is activated in response to the induced magnetic field In the wireless authentication system in which the authentication device authenticates the responder by transmitting a response signal including identification information set individually in advance in the second wireless communication method.
In the second wireless communication system, a plurality of communication slots are set during the generation period of the induced magnetic field in the first wireless communication system, and the responder transmits a response signal in a randomly selected communication slot. Reply,
The authentication device causes the identification information of the authenticated responder to be transmitted by being superimposed on an induction magnetic field by the first wireless communication method that is subsequently transmitted by the activation device,
Furthermore, even if the responder returns a response signal including the identification information of the responder a predetermined number of times or more, the responder is transmitted with the identification information superimposed on the induced magnetic field by the first wireless communication method. If not, during the transmission of the induction magnetic field by the first wireless communication method, transmitting a transmission request signal by the second wireless communication method, the authentication device that has received the transmission request signal, to the activation device, A wireless authentication system characterized in that a transmission stop signal is superimposed on a magnetic field induced by the first wireless communication method and transmitted, and a response signal other than the responder that has transmitted the transmission request signal is suspended. . An activation device, one or a plurality of responders, and an authentication device, wherein the activation device generates an induced magnetic field in a first wireless communication method, and the responder is activated in response to the induced magnetic field In the wireless authentication system in which the authentication device authenticates the responder by transmitting a response signal including identification information set individually in advance in the second wireless communication method.
In the second wireless communication system, a plurality of communication slots are set during the generation period of the induced magnetic field in the first wireless communication system, and the responder transmits a response signal in a randomly selected communication slot. Reply,
The authentication device superimposes and transmits the identification information of the authenticated transponder on an induction magnetic field by the first wireless communication method that the activation device transmits later,
Furthermore, in the second wireless communication system, a control slot that is not used for returning the response signal is set, and the responder returns the response signal including the identification information of itself for a predetermined number of times, An authentication apparatus that transmits a transmission request signal using the control slot and receives the transmission request signal when the identification information is not superimposed on the induced magnetic field by the first wireless communication method and transmitted. Causes the activation device to superimpose and transmit a transmission stop signal on the induced magnetic field by the first wireless communication method, and pauses transmission of a response signal by a responder other than the responder that transmitted the transmission request signal A wireless authentication system characterized by.   The authentication device detects the level of the response signal returned from each responder. If the detected level is equal to or higher than a predetermined level, the authentication device guides the activation device by the first wireless communication method. A response device that superimposes a selection request signal on a magnetic field and transmits the response signal, and the responder that has received the selection request signal returns the response signal when the transmission request condition by the selection request signal matches itself. The wireless authentication system according to claim 1.   The wireless authentication system according to claim 8, wherein the selection request signal is whether or not a battery remaining level is a predetermined value or more. An activation device, one or a plurality of responders, and an authentication device, wherein the activation device generates an induced magnetic field in a first wireless communication method, and the responder is activated in response to the induced magnetic field In the wireless authentication system in which the authentication device authenticates the responder by transmitting a response signal including identification information set individually in advance in the second wireless communication method.
In the second wireless communication method, a plurality of communication slots are set to be variable in the number of slots during the induction magnetic field generation period in the first wireless communication method, and the responder is set to a randomly selected communication slot. Reply the response signal,
The authentication device transmits the identification information of the authenticated transponder superimposed on an induction magnetic field by the first wireless communication method that is subsequently transmitted by the activation device, and is authenticated at a predetermined time. The number of communication slots to be used is determined according to the number of devices, the data of the number of usable communication slots and the data of the slot ID are transmitted superimposed on the induction magnetic field, and the slot ID data, A wireless authentication system that generates an error determination bit by using ID data corresponding to a usable slot as bits for error determination. The activation device and the authentication device constitute an interrogator,
The interrogator is
A control circuit for generating a start signal;
An LF band transmission circuit and an LF antenna for superimposing the activation signal on a signal component of an induction magnetic field and transmitting the signal to the responder in the first wireless communication method;
An RF antenna and an RF receiving circuit configured to receive the response signal from the responder and apply the response signal to the control circuit;
The responder is
An LF antenna and an LF band receiving circuit for receiving an activation signal from the interrogator;
Built-in battery,
A control circuit that is activated by the received activation signal and generates a response signal that includes preset unique identification information;
11. An RF transmission circuit and an RF antenna for returning the response signal to the interrogator by the second wireless communication system using the built-in battery as a power source. The wireless authentication system according to Item.

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