JP4760638B2 - Wireless device and program - Google Patents

Description

  The present invention is a system in which wireless transmission / reception is periodically or irregularly performed between 1: 1, 1: N, and M: N devices, and the power-on time required for communication is shortened as much as possible to consume. The present invention relates to a wireless device that reduces power and increases the timing accuracy of periodic wireless transmission and reception.

  In recent years, security systems have been put into practical use in which an operation lock of an electronic device such as a mobile phone or a personal computer is wirelessly controlled in consideration of security.

  As one form of such a security system, in order to prevent the mobile phone from being stolen, a user of the mobile phone possesses an identification signal transmitter in the form of a card, and the mobile phone and the identification signal transmitter are previously connected. There is a mobile phone that can be used when a predetermined identification code is communicated with each other and the identification code is confirmed by both parties (see, for example, Patent Document 1).

  This is an invention of a vehicle security system to which a wireless key authentication method is applied, both between a wireless key having a feature of the present invention possessed by a user and a control device mounted on a vehicle to be secured. Communication.

  The control device receives a signal from the wireless key and transmits a predetermined response signal. The internal calculation means performs authentication by comparing the authentication code sent from the wireless key with the code stored in the storage means. When the authentication is confirmed, a permission signal is sent to a control means such as a switch, and physical control of applying / unlocking the door key of the vehicle to be controlled is performed.

  The components of the wireless key are supplied with power using a button battery or the like as a battery source. When power is supplied, control for shifting from the sleep state to the active state is performed. When the constant stationary state continues, it is possible to shift to the sleep state and reduce the consumption of the battery source.

  The active state of the wireless key has a search mode, an authentication mode, and an application mode. On the other hand, the main body side device has a standby reception mode, an authentication mode, and an application mode.

  In the search mode for authentication between the wireless key 1 and the main unit (base) side device, a short M-sequence signal is used, and after entering the authentication mode and the application mode, a longer M-sequence signal for authentication is used. I use it. As a result, the power consumption in the search mode is about ３ that in the authentication mode and the application mode.

  On the other hand, in a communication system, as one method for reducing current, there is a method of stopping the operation of a wireless device except when necessary and allowing itself to operate at high speed only when wireless communication is necessary. In order to realize this method, it is necessary to clearly define the timing of wireless communication and the timing when it is not as a system, and at the timing of wireless communication, it is necessary to carry out wireless communication by supplying current to the circuit for the minimum necessary time. There is. This method is called a “synchronous communication method”.

  Examples of using the “synchronous communication method” include the following (see, for example, Patent Documents 2, 3, 4, 5, 6, 7, and 8).

  First, Patent Document 2 provides a first period T1 (30 seconds) and a second period T2 (10 minutes), and battery-driven wireless communication devices perform synchronization signal communication for each T2. . Then, at the time of synchronization signal communication at T2, the next first period T3 is determined based on a random numerical value such as a PLL convergence time, and changed to T3, thereby realizing system collision avoidance. It is.

  In Patent Document 3, in an automatic meter-reading radio, in order to reduce power consumption, synchronization is performed so that each other performs transmission and reception at the same timing. Is driven. And the method which can set easily ID allocated uniquely for every consumer is provided.

  Further, Patent Document 3 provides a first cycle T1 (30 seconds) and a second cycle T2 (10 minutes) in an automatic meter reading system, and battery-driven wireless communication devices communicate with each other at every T2. Is to do. Then, similarly to Patent Document 1, the next first period T3 is determined based on a random numerical value such as a PLL convergence time, and is changed to T3, thereby realizing system collision avoidance. .

  Patent Document 4 discloses an automatic meter reading device in a “sleep mode” in which the wireless transmission / reception power is not turned on, an “initial synchronization mode” in which the automatic meter reading devices are synchronized with each other, It has three modes of “data communication mode” for performing data communication, and when “synchronous communication” fails in “data communication mode”, it automatically switches to “sleep mode” and is useless. This avoids excessive power consumption.

  Patent Document 5 discloses an automatic meter reading device in a “sleep mode” in which wireless transmission / reception power is not turned on, an “initial synchronization mode” in which automatic meter reading devices are synchronized with each other, periodic clock adjustment, There are three modes of “data communication mode” for performing data communication. When periodic synchronization communication fails in “data communication mode”, it automatically returns to “Suoki synchronization mode”. The system can be automatically restored without human intervention. Also, by raising the synchronization failure information to the center, system abnormality detection can be quickly grasped.

  Further, Patent Document 6 performs periodic synchronization communication in a wireless system for the main device to grasp the state of the terminal device. The main device stores the synchronization communication failure device so that the abnormal time It is easy to grasp the detection data of the belt. In addition, the communication status of a specific device can be monitored. Further, by grouping devices and performing synchronized communication, it is possible to reduce the degree of congestion of the line, and to realize power saving of the devices through synchronized communication with the minimum necessary frequency.

Further, Patent Document 7 can suppress the influence of noise and the like by periodically changing the frequency for performing synchronization communication and other communication in a wireless communication system. In addition, by determining the frequency to be selected in a specific pattern in advance, it is possible to reduce the power consumption of the device by suppressing interference with other systems and reducing the frequency of retransmission.
JP 2004-143806 A JP-A-7-221743 JP-A-8-181789 JP-A-7-284170 JP-A-9-27801 JP-A-9-36969 JP-A-9-64878 JP-A-9-130373

  However, the configuration of Patent Document 1 describes a method for reducing the current in the search mode by shortening the message length in the search mode, but there is no description of the current reduction in the authentication mode or the application mode. In addition, there is no description regarding the communication timing in the authentication mode or the application mode.

  Further, in the configurations of Patent Documents 2 to 8, although the “synchronous communication method” is adopted for power saving and the like, there is no description about a method for realizing the synchronous communication interval and the accuracy thereof.

  The important point in the “synchronous communication method” that realizes low power consumption is to clearly define the timing of wireless communication in the system, and to accurately realize the timing by the individual wireless devices that make up the system. is there. Here, as described above, the wireless device needs to stop its operation in order to reduce power consumption except for the above timing. At this time, in order to reduce power consumption, not only the operation of the wireless device is stopped, but also the operation clock for operating the wireless device at high speed is not stopped, so that the effect of low power consumption cannot be exhibited. This is because the current consumed by the operation clock for high-speed operation is large.

  Therefore, the wireless device stops the operation clock for high-speed operation except during wireless communication, and also suspends the operation clock itself, oscillates the operation clock for high-speed operation in accordance with the timing of wireless communication, It is necessary to perform wireless communication. Here, in order to change the operation clock for high-speed operation from the stop state to the operation state, it is necessary to wait for the oscillation to stabilize after starting the operation, that is, oscillation, and then the wireless device itself can be operated at high speed. Can not do it.

  Here, in order to accurately realize the wireless communication timing, which is an important point in the “synchronous communication method” that realizes low power consumption, design it considering the oscillation stabilization time of the operation clock for high-speed operation. There is a problem that the measurement with the timer included in the wireless device becomes complicated.

  For those described in Cited Documents 1 to 8, the oscillation stabilization time of the operation clock for operating at high speed is not considered, and the operation clock for operating the wireless device at high speed during non-communication is stopped. If this happens, there is a problem that synchronization is lost. On the other hand, if the operation clock for operating the wireless device at high speed during non-communication is not stopped so that synchronization is not lost, the effect of low power consumption operation during non-communication cannot be fully exhibited, and power consumption is reduced. There was a problem that it could not be reduced.

  The present invention solves the above-mentioned conventional problems, and in a simplified form of time measurement of a wireless device, while keeping current consumption of the wireless device to a minimum, the communication timing is accurately adjusted and reliable synchronous communication is performed. An object of the present invention is to provide a wireless device that realizes the above and a program thereof.

The wireless device A and the wireless device B are configured, and the wireless device A and the wireless device B are synchronized with each other in an asynchronous communication mode in which asynchronous communication is performed without synchronizing with each other in time. In the asynchronous communication mode, the wireless device A operates while maintaining itself at a high speed operation, and in the synchronous communication mode, the wireless communication device A has at least two modes of synchronous communication mode for performing synchronous communication. In the wireless device that operates while shifting itself to at least two states of high speed operation and stop operation, the wireless device A includes high speed clock generation means for generating a clock for operating at high speed. A transmission means for transmitting a radio signal in the case of the high-speed operation, and a time point when a signal for transition from the radio B to the synchronous communication mode is received in the asynchronous communication mode. The timer unit A that is activated and measures the time until the high-speed clock generation unit stably generates a clock before transmitting a signal in the synchronous communication mode, and at the same timing as the activation of the timer unit A The timer unit B that measures the time for transmitting a signal to the wireless device B at regular intervals in the synchronous communication mode, and the synchronous communication mode when the timer unit A completes the measurement. After the operation of the high-speed clock generation means is turned off using the high-speed clock control means, the synchronization start means for starting the transmission means first, the high-speed clock control means for turning on and off the high-speed clock generation means The stop means for shifting itself from the high speed operation to the stop operation, and the timer means B complete the measurement for a predetermined time, After ON operation of the high-speed clock generating means using a high-speed clock control means, fast transition means for shifting itself from stop operation for high speed operation, a radio apparatus composed of a capital.

  And since the wireless device A can transmit the wireless signal accurately at a predetermined cycle while maintaining the low power consumption operation, the receiving wireless device B receives the wireless signal from the wireless device A. The time for turning on the power can be minimized, and the power consumption of the entire system can be suppressed.

  In addition, since the accuracy of the transmission interval can be realized, the connectivity with the facing wireless device B is improved, and the spread of the system can be realized.

  Furthermore, in the synchronous communication mode, since the time that must be measured by the wireless device A is only the measurement time of the timer means B, the configuration of the wireless device A can be simplified, and accordingly, the wireless device A can be easily and inexpensively. Can be made.

  According to the present invention, since it is possible to transmit a radio signal accurately at a predetermined cycle while maintaining a low power consumption operation, it is possible to minimize the time during which the opposite radio apparatus turns on the reception power source to receive the radio signal. Therefore, it is possible to suppress power consumption of the entire system.

  In addition, since the accuracy of the transmission interval can be realized, the connectivity with the facing wireless device is improved. That is, when this system becomes widespread and many users use this system, wireless communication collision avoidance can also be realized. In other words, if wireless devices communicate with each other accurately at regular intervals, the possibility of avoiding collisions with the radio waves of the system used by other users increases, and the reliability of the system Will improve.

  In addition, in terms of connectivity with other companies, when connecting each other wireless device manufactured by different manufacturers, if the communication interval is defined as a standard, communication between wireless devices manufactured by different manufacturers is also possible. It becomes possible. At that time, in order to comply with the standard, it is essential to improve the communication interval accuracy. If the connection between wireless devices manufactured by different manufacturers is guaranteed, the spread of this system can be realized.

  Furthermore, in the synchronous communication mode, the time that must be measured can be suppressed to one, so that the configuration of the wireless device can be simplified, and accordingly, the wireless device can be easily manufactured at low cost. .

The first invention is composed of a wireless device A and a wireless device B, and the wireless device A and the wireless device B are connected to each other in an asynchronous communication mode for performing asynchronous communication that does not synchronize with each other in time. In the asynchronous communication mode, the wireless device A operates while maintaining itself at a high speed operation. In the synchronous communication mode, in the wireless device that operates while changing itself to at least two states of high speed operation and stop operation, the wireless device A generates a clock for operating at high speed. A high-speed clock generation means for transmitting, a transmission means for transmitting a radio signal when it is in the high-speed operation, and a signal for transition from the wireless device B to the synchronous communication mode in the asynchronous communication mode Timer means A that is activated when receiving the signal, and measures the time until the high-speed clock generation means stably generates a clock before transmitting a signal in the synchronous communication mode, and the timer means A At the same time as the activation, timer means B that measures the time for transmitting a signal to the wireless device B at regular intervals in the synchronous communication mode, and when the timer means A completes the measurement A synchronization start unit that first activates the transmission unit in the synchronous communication mode; a high-speed clock control unit that turns on and off the high-speed clock generation unit; and a high-speed clock generation unit that uses the high-speed clock control unit. After the operation is turned off, the stop means for shifting itself from the high speed operation to the stop operation and the timer means B have completed the measurement for a certain time. If the after ON operation of the high-speed clock generating means by using the high-speed clock control means, fast transition means for shifting itself from stop operation in a high speed operation and is formed in and.

  And since the wireless device A can transmit the wireless signal accurately at a predetermined cycle while maintaining the low power consumption operation, the receiving wireless device B receives the wireless signal from the wireless device A. The time for turning on the power can be minimized, and the power consumption of the entire system can be suppressed.

  In addition, since the accuracy of the transmission interval can be realized, the connectivity with the facing wireless device B is improved, and the spread of the system can be realized.

  Furthermore, in the synchronous communication mode, since the time that must be measured by the wireless device A is only the measurement time of the timer means B, the configuration of the wireless device A can be simplified, and accordingly, the wireless device A can be easily and inexpensively. Can be made.

  According to a second aspect of the present invention, when the wireless device A receives a response signal from the wireless device B after transmitting a wireless signal using the transmitting means in the synchronous communication mode, the wireless device A operates at high speed. Receiving means for receiving and analyzing the response signal, and timer starting means for starting the timer means A and restarting the timer B when the receiving means fails to correctly receive the response signal; When the timer unit A completes the measurement, the transmission unit is configured to retransmit the radio signal using the transmission unit.

  In the synchronous communication mode, even when the transmission interval of the subsequent wireless signal is changed by retransmission performed when a response to the transmitted wireless signal cannot be normally received, the wireless device A maintains the low power consumption operation. Thus, wireless transmission can be accurately performed at a predetermined cycle, and the power consumption of the entire system can be suppressed.

  According to a third aspect of the present invention, the wireless device A transmits a wireless signal using the transmitting unit, and before starting the stop unit or after determining that the receiving unit has correctly received the response signal. Before starting the stop means, it has a transmission message creation means for creating and saving the next transmission message, and the transmission means does not create a transmission message after shifting to the high-speed operation and saves the transmission It is configured to transmit a message.

  In the synchronous communication mode, the wireless transmission interval of the wireless device A is not affected by the transmission data creation time, and can be transmitted more accurately at a predetermined cycle, thereby reducing the power consumption of the entire system. Can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a block diagram of a wireless device A according to the first embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a wireless device A. Reference numeral 2 denotes an antenna. 3 is a control means. Reference numeral 4 denotes high-speed clock generation means. Reference numeral 5 denotes low-speed clock generation means. Reference numeral 6 denotes high-speed clock control means. 7 is a stopping means. 8 is a low-speed transition means. Reference numeral 9 denotes timer means A. Reference numeral 10 denotes timer means B. Reference numeral 11 denotes synchronization start means. Reference numeral 12 denotes transmission means. Reference numeral 13 denotes a receiving means. Note that the wireless device B has the same configuration as the wireless device A1, and thus detailed description thereof is omitted.

  The wireless device A1 communicates with a wireless device B (not shown). Here, the wireless device A1 is a wireless key, for example, and is carried by the user together with the mobile phone in which the wireless device B is built. Here, the wireless device B measures the electric field strength of the radio wave from the wireless device A, and if the received electric field strength becomes weak, it restricts the use of the mobile phone.

  In recent years, some mobile phones are equipped with an electronic payment function. If a user loses or steals the mobile phone, the electronic payment function of the mobile phone may be abused. Measures are becoming necessary. As one of them, the user always carries the wireless device A1 together with the mobile phone, the wireless device A1 periodically transmits a signal to the wireless device B built in the mobile phone, and the wireless device B By measuring the electric field strength at the time of signal reception, the distance between the wireless device A1 and the wireless device B is detected. If the electric field strength becomes weak, the mobile phone may be lost / stolen. For example, the electronic payment function is restricted to enhance security.

  FIG. 2 shows a communication sequence between the wireless device A1 and the wireless device B in FIG. FIG. 2 shows a communication sequence in search mode and initial authentication mode, and FIG. 3 shows a communication sequence in authentication mode.

  The search mode is a mode in which the wireless device A1 and the wireless device B confirm each other's existence and shift to the initial authentication mode.

  The initial authentication mode is a mode in which the wireless device A1 and the wireless device B authenticate each other whether or not they are their own counterparts. The wireless device A1 and the wireless device B have previously registered each other by a pairing operation. In the initial authentication mode, by performing encrypted communication based on this registration information, impersonation, snooping, tampering, etc. Maintains strong strength and enhances security.

  The search mode and the initial authentication mode are “asynchronous communication modes” in which the wireless device A1 and the wireless device B communicate asynchronously without taking time synchronization with each other.

The authentication mode is a “synchronous communication mode” in which the wireless device A1 and the wireless device B periodically communicate with each other in time synchronization, and is a mode in which the existence of the other party is confirmed. The presence of the other party is confirmed in the authentication mode, and the wireless device B does not restrict the use of the mobile phone while receiving radio waves from the wireless device A1 at a predetermined reception level or higher.

  A communication sequence in the search mode and the initial authentication mode will be described with reference to FIG.

  Radio A1 periodically transmits a search signal 14. The time interval for transmitting the search signal 14 is, for example, every second. The search signal 14 includes a part of the ID indicating the wireless device A1.

  When the wireless device B receives the search signal 14, it transmits a search response 15 to the wireless device A1. When the wireless device A1 receives the search response 15, the wireless device A1 transmits an ID signal (1) 16 including all the IDs of the wireless device A1. The wireless device B collates the ID signal (1) 16 with the ID of the communication partner held in the wireless device B, and if they match, the ID signal (2) 17 that includes all the IDs of the wireless device B Send. This completes the search mode.

  Next, the initial authentication mode will be described.

  When the wireless device A1 receives the ID signal (2) 17 at the end of the search mode, the wireless device A1 transmits the confirmation signal (1) 18, and the wireless device B receives the confirmation signal (1) 18, and then authenticates. Signal (1) 19 is transmitted. Here, when the wireless device A1 receives the authentication signal (1) 19, the wireless device A1 performs encryption processing based on the authentication signal (1) 19, and as a result, the encrypted authentication signal (2) 20 is transmitted to the wireless device B. Send to.

  On the other hand, after transmitting the authentication signal (1) 19 to the wireless device A1, the wireless device B performs an encryption process in the same manner as the wireless device A1 based on the transmitted authentication signal (1) 19, and then The authentication signal (2) 20 that the wireless device A1 will transmit to the wireless device B is completed internally. Then, when the authentication signal (2) 20 is actually received from the wireless device A1, the received signal is compared with the authentication signal (2) 20 created by previously encrypting in advance, so that mutual authentication can be performed. I do.

  If it is determined that the received authentication signal (2) 20 is correct, authentication is established, and the wireless device B transmits an authentication response signal (1) 21 to the wireless device A1, and transitions to the authentication mode. To do. When the wireless device A1 also correctly receives the authentication response signal (1) 21, it determines that authentication with the wireless device B has been established, and transitions to the authentication mode.

  In this description, the wireless device B transmits the authentication signal (1) 19 to the wireless device A1 and then receives the authentication signal transmitted by itself before receiving the authentication signal (2) 20 from the wireless device A1. The encryption processing is performed based on the signal (1) 19, and the result is compared with the authentication signal (2) 20 received from the wireless device A1, and the authentication determination is made. The wireless device B authenticates from the wireless device A1. After receiving the signal (2) 20, the received signal may be decoded and an authentication determination may be made based on whether the result is correct.

  Next, a communication sequence in the authentication mode of FIG. 3 will be described.

  In the authentication mode, the wireless device A1 transmits a simple ID 22 that is a first identification signal to the wireless device B at a predetermined cycle. Here, in FIG. 3, the predetermined cycle is 3 seconds. On the other hand, the wireless device B performs reception at the timing of the simple ID 22 transmitted by the wireless device A1, but here, the reception level (electric field strength) is measured without analyzing the received data.

  Here, when the electric field strength is below a predetermined level, for example, when it continues several times in succession, the wireless device B imposes a function restriction on the mobile phone, assuming that the distance from the wireless device A1 is a predetermined distance or more. . After that, when the electric field strength returns to a predetermined level or higher, the function restriction of the mobile phone is released.

  On the other hand, apart from the simple ID 22, the wireless device A1 and the wireless device B authenticate each other by performing round-trip communication every 24 seconds, for example. This is a pair of confirmation signal (1) 23 and authentication signal (1) 24 in FIG. 3, and a pair of authentication signal (2) 25 and authentication response signal (1) 26. Here, the confirmation signal (1) 23 and the authentication signal (2) 25 are the second identification signals, and in the case of 24 seconds, the interval is an integral multiple (8 times) of the simple ID 22 every 3 seconds. .

  If the round-trip communication every 24 seconds is not successful, the wireless device A1 and the wireless device B return to the search mode and start from the operation of capturing the communication partner again.

  Thus, in the authentication mode, the “synchronous communication method” is employed in which the wireless device A1 and the wireless device B communicate with each other in time synchronization.

  In such a system, the wireless device A1 and the wireless device B are required to operate with low power consumption. That is, both the wireless key that is the wireless device A1 and the mobile phone that incorporates the wireless device B are both battery-operated, extending the battery life and reducing the frequency of battery replacement operations and charging operations. Improvement of user convenience is very important.

  For this reason, in the search mode of FIG. 2, the search signal 14 of the radio A1 is transmitted at regular intervals and the search signal 14 of the radio B is captured, except for the search signal 14 transmission operation and the search signal 14 capture operation. Therefore, it is necessary to turn off the wireless transmission / reception power source and to reduce the power of the microcomputer unit responsible for the control function of the wireless device A1 and the wireless device B as much as possible.

  In the authentication mode of FIG. 3, the simple ID 22 transmission of the wireless device A1, the transmission / reception of the confirmation signal (1) 23 and the authentication signal (1) 24, and the transmission / reception of the authentication signal (2) 25 and the authentication response signal (1) 26 are performed. Similarly, except for receiving the simple ID 22 of the wireless device B, transmitting / receiving the confirmation signal (1) 23 and the authentication signal (1) 24, and transmitting / receiving the authentication signal (2) 25 and the authentication response signal (1) 26, And turning off the power of the microcomputer unit responsible for the control function of the wireless device A1 and the wireless device B as much as possible.

  This is because in this system, most of the time spent in the search mode in which the wireless device A1 and the wireless device B capture each other or in the authentication mode in which the mutual authentication continues is occupied. Conversely, the initial authentication mode described above is a process in the process from the search mode to the authentication mode, and is not a frequently used mode. Therefore, the influence of the operating current on the overall power consumption is small.

  On the other hand, in the authentication mode of FIG. 3, as described above, the communication of the simple ID 22 every 3 seconds, the transmission / reception of the confirmation signal (1) 23 and the authentication signal (1) 25 every 24 seconds, and the authentication signal (2) 25 It is necessary to securely transmit / receive the authentication response signal (1) 26, to increase the accuracy of mutual authentication, and to improve the reliability of the system.

  For this purpose, the wireless device A1 increases the accuracy of the time interval every 3 seconds and every 24 seconds in FIG. 3, and the wireless device B supplies power to the wireless unit except for the necessary minimum time at the timing of every 3 seconds and every 24 seconds. Even if it is turned off and it operates in the ultra low power consumption mode, it must be ensured that communication is performed every 3 seconds and every 24 seconds.

  In addition, when the wireless device A1 increases the accuracy of the time interval every 3 seconds and every 24 seconds, this system becomes widespread, and when a large number of users use this system, wireless communication collision avoidance is realized. It also becomes. In other words, if the wireless device A1 and the wireless device B can communicate accurately every 3 seconds and every 24 seconds, it is possible to avoid collision with the radio waves of this system used by other users. And the reliability of the system is improved.

  Furthermore, from the viewpoint of connectivity with other companies, it is important for the wireless device A1 to increase the time interval accuracy every 3 seconds and every 24 seconds.

  That is, when the wireless device A1 and the wireless device B are interconnected when manufactured by different manufacturers, if the communication interval such as every 3 seconds or every 24 seconds is defined as a standard, the wireless devices manufactured by different manufacturers Communication between each other is also possible. At that time, in order to comply with the standard, it is essential to improve the time interval accuracy every 3 seconds and every 24 seconds. If the connection between wireless devices manufactured by different manufacturers is guaranteed, the spread of this system can be realized.

  As described above, the operation of the wireless device A1 for achieving both low power consumption and high time interval accuracy will be described below.

  In FIG. 1, various control units of the wireless device A1 are one LSI. Here, the control means 3 is responsible for all the operation control of the wireless device A1. The LSI has high-speed clock generation means 4 and low-speed clock generation means 5 outside for the operation.

  The high-speed clock generation means 4 and the low-speed clock generation means 5 are called “high-speed clock” and “low-speed clock”, respectively, and create a base time for the control operation speed of the wireless device A1, and timer means A9 included in the wireless device A1. The time base measured by the timer means B10 is generated.

  The radio device A1 can be roughly divided into three operation modes: a “high-speed operation mode”, a “low-speed operation mode”, and an “operation stop mode”.

  The “high-speed operation mode” controls the operation of the wireless device A1 based on the “high-speed clock” supplied from the high-speed clock generation means 4, and the operation speed is increased, but the power consumption is increased accordingly. Most of the power consumption is due to the oscillation operation of the oscillator of the high-speed clock generation means 4. On the other hand, the wireless transmission / reception function of the wireless device A1 does not operate unless it is in the “high-speed operation mode” because it performs transmission speed, modulation / demodulation, and frequency adjustment.

  The “low-speed operation mode” is a mode in which power consumption is suppressed by stopping the “high-speed clock” and the wireless transmission / reception function instead of reducing the operation speed of the wireless device A1. Since the operation speed is slow, even when executing a software instruction, one instruction time becomes long.

  The “operation stop mode” is a mode for stopping the software operation of the wireless device A1. That is, the programmed software is not executed. By using this together with stopping the high-speed clock generation means 4, the current consumption of the wireless device A1 becomes extremely small.

  However, the low-speed clock generation means 5 continues to operate, and the timer means B10 that measures the time created based on the low-speed clock generation means 5 continues to operate. Then, when the timer means B10 has completed the time measurement, it is possible to return from the “operation stop mode” to the “low speed operation mode”.

Here, the three transitions of “high-speed operation mode”, “low-speed operation mode”, and “operation stop mode” are via the “low-speed operation mode” in the middle. That is, in order to change from the “high-speed operation mode” to the “operation stop mode”, after changing to the “low-speed operation mode”, the high-speed clock generation unit 4 is stopped and current consumption is suppressed, and then the “operation stop mode” is entered. Thus, the low power consumption performance of the “operation stop mode” can be exhibited.

  Conversely, in order to change from the “operation stop mode” to the “high speed operation mode”, when the time measurement made based on the low speed clock generation means 5 of the timer means B10 is completed, the transition is made to the “low speed operation mode” and stop there. The operation of the high-speed clock generating means 4 is started, and thereafter, the “high-speed operation mode” is entered.

  Here, since the high-speed clock generation means 4 is composed of a high-speed oscillator as described above, it is necessary to wait for stable oscillation before starting its operation. Therefore, after the transition to the “low-speed operation mode”, the operation of the high-speed clock generation unit 4 is started, and after sufficiently waiting for the oscillation to stabilize, the transition to the “high-speed operation mode” is performed.

  In the above description, the “low-speed operation mode” is not necessarily essential, and the same control is possible in two modes of “high-speed operation mode” and “operation stop mode”.

  A method for realizing the authentication mode of FIG. 3 with the above configuration will be described with reference to FIG. The wireless device A1 transmits the authentication signal (2) 20, which is the last of the initial authentication mode, and then receives the authentication response signal (1) 21.

  This authentication response signal (1) 21 is like a signal for shifting to the next authentication mode, and is positioned as an authentication mode shift signal. This transmission / reception must be performed in the “high-speed operation mode”. Then, after receiving the authentication response signal (1) 21, the state transits to the “low speed operation mode”, stops the high speed clock generation means 4, and transits to the “operation stop mode”.

  Here, the return from the “operation stop mode” is the transmission timing of the simple ID 22 after 3 seconds. That is, in FIG. 3, the transmission time from the last authentication signal (2) 20 in the initial authentication mode to the transmission of the first simple ID 22 in the authentication mode is 3 seconds, and the wireless device A1 transmits the first simple ID 20 at the transmission timing. The simple ID 20 must be transmitted.

  That is, the wireless device A1 must transmit the simple ID 22 exactly 3 seconds after transmitting the authentication signal (2) 20. Here, as described above, the wireless device A1 transmits the authentication signal (2) 20, and then shifts to the “operation stop mode” through the “low speed operation mode”. In order to transmit the simple ID 22, return from the “operation stop mode”, start the oscillation of the high-speed clock generation means 4 in the “low-speed operation mode”, wait for a sufficient time until the oscillation stabilizes, And the simple ID 22 must be transmitted.

  That is, after transmitting the authentication signal (2) 20, the wireless device A1 starts the measurement for 3 seconds after shifting to the “operation stop mode” through the “low speed operation mode”, and completes the measurement for 3 seconds. At this time, the operation is returned from the “operation stop mode” to the “low speed operation mode” to start the operation of the high speed clock generation means 4 and waits for a sufficient period of time for oscillation to stabilize. In this case, the time from the transmission timing of the authentication signal (2) 20 to the transmission of the first simple ID 22 in the authentication mode exceeds 3 seconds. This is because the oscillation stabilization wait time of the oscillator of the high-speed clock generation means 4 and the operation time in the “low-speed operation mode” are not considered.

Even if the measurement for 3 seconds is started when the transmission of the authentication signal (2) 20 is started, if the measurement is resumed from the “operation stop mode” upon completion of the measurement for 3 seconds, the subsequent “low speed operation mode” Since the operation time and the oscillation stabilization wait time of the oscillator of the high-speed clock generation means 4 are not taken into consideration, the simple ID 22 cannot be transmitted at intervals of 3 seconds.

  On the other hand, if the operation time in the “low-speed operation mode” and the oscillation stabilization waiting time of the oscillator of the high-speed clock generation unit 4 are taken into consideration, and if a time shorter than 3 seconds is measured, the authentication signal (2) 20 It is possible to accurately set 3 seconds from the transmission timing to the transmission of the first simple ID 22 in the authentication mode. Here, the interval from the transmission of the first simple ID 22 to the transmission of the second simple ID 22 in the authentication mode is also 3 seconds.

  Similarly, the wireless device A1 transmits radio waves at intervals of 3 seconds until the timing of 24 seconds. More specifically, the wireless device A1 transmits radio waves at intervals of 3 seconds as long as the authentication mode continues after the timing of 24 seconds. Need to send.

  However, except for the transmission of the first simple ID 22 after the initial authentication mode, all may be measured for 3 seconds. As shown in FIG. 4, for the transmission of the simple ID 22 at intervals of 3 seconds, the wireless device A1 accurately sets 3 seconds between the timing of returning from the “operation stop mode” and switching to the “low speed operation mode”. If measured, the transmission interval of the simple ID 22 is inevitably 3 seconds.

  In other words, if even the operating time in the “low-speed operation mode” is constant every time, if you measure exactly 3 seconds between the timing of returning from the “operation stop mode” and switching to the “low-speed operation mode”, it will surely be every 3 seconds. The simple ID 20 can be transmitted.

  Considering this, in order to ensure that the transmission interval of the first simple ID 20 in the authentication mode is 3 seconds from the transmission timing of the last authentication signal (2) 20 in the initial authentication mode described above, in the “low speed operation mode” In consideration of the operating time and the oscillation stabilization wait time of the oscillator of the high-speed clock generation means 4, if a time shorter than 3 seconds is measured, 3 seconds must be measured as shown in FIG. In other words, the wireless device A1 must be configured to measure two times.

  Here, the wireless device A1 needs to be operated with low power consumption as described above, and must be provided at a low cost in order to promote the spread of the system. In many cases, it is difficult to measure two types of time in a limited timer resource.

  Also, a good time such as 3 seconds is relatively easy to measure with an internal timer, but a fractional time shorter than 3 seconds is extremely difficult because the timers that can be used are limited. Further, every time the operation program of the “low speed operation mode” is changed, if the measurement time of the fraction shorter than 3 seconds is not changed, the authentication mode first starts from the transmission timing of the last authentication signal (2) 20 in the initial authentication mode. The transmission interval of the simple ID 22 cannot be reliably set to 3 seconds, and correction and the like are difficult, and the difficulty of realization increases.

  In order to solve such a problem, in the present embodiment, the wireless device A1 is operated as follows according to the flowchart of FIG. First, in the initial authentication mode, the wireless device A1 receives the authentication signal (1) 19 by the receiving means 13 via the antenna 2 (S1), performs encryption processing, and transmits the authentication signal (2) 20. However, before transmitting the authentication signal (2) 20, the timer unit A9 and the timer unit B10 are operated in advance (S2), and measurement of 3 seconds and measurement of the transmission timing of the authentication signal (2) 20 are started. To do.

  Here, the timing for starting the measurement of 3 seconds by the timer means B10 is the time of the “low speed operation mode” while waiting for the oscillation stabilization of the high speed clock generation means 4 in FIG. It is the time that goes back from the transmission timing of.

  In order to measure the timing of this retroactive time in time series, the timer means A9 is operated, and when the timer means A9 completes the measurement (S3), the synchronization start means 11 is operated, and the authentication signal (2 ) 20 is transmitted from the transmission means 12 to the wireless device B via the antenna 2 (S4).

  Thereafter, the wireless device A1 receives the authentication response signal (1) 21 from the wireless device B (S5), and then operates the low speed transition means 8 to shift to the “low speed operation mode” (S6). Then, the oscillation of the high-speed clock generation means 4 is stopped using the high-speed clock control means 6 (S7), and the stop means 7 is operated to stop the operation of the wireless device A1 to enter the “operation stop mode” ( S8).

  When the timer means B10 completes the measurement for 3 seconds (S9), the wireless device A1 starts operating in the “low speed operation mode” by the low speed transition means 8 (S11) and uses the high speed clock control means 6 Then, the oscillation of the high-speed clock generation means 4 is started (S10).

  Then, it waits for the oscillation stabilization time of the high-speed clock generation means 4 (S12). After waiting for the oscillation stabilization time of the high-speed clock generation means 4, the wireless device A1 itself is shifted to the “high-speed operation mode” (S13). Note that the processing (S10 to S13) for transitioning to the “high-speed operation mode” is performed by a high-speed transition unit (not shown).

  Thereafter, the wireless device A1 transmits the simple ID 22 from the transmitting unit 12 to the wireless device B via the antenna 2 (S15).

  After transmitting the simple ID 22 to the wireless device B, the wireless device A1 transitions to the “low speed operation mode” using the low speed transition means 8 (S6). Then, the oscillation of the high-speed clock generation means 4 is stopped using the high-speed clock control means 6 (S7), the stop means 7 is operated to stop the operation of the wireless device A1, and the “operation stop mode” is set ( S8).

  Note that when the measurement for 3 seconds is completed, the timer means B10 does not stop the measurement, but starts measurement for the next 3 seconds again. When 3 seconds have passed, the simple ID 22 is transmitted in the same procedure as before.

  At the timing of 24 seconds (S14), the confirmation signal (1) 23 or the authentication signal (2) 25 is transmitted (S16) by the same procedure, and the authentication signal (1) 24 or the authentication response signal (1) 26. Is received (S17).

  With the above configuration, the timer unit B10 of the wireless device A1 can continuously measure only 3 seconds, which is a predetermined transmission interval of the simple ID 22, and confirms the confirmation signal (1) every 24 seconds. In addition, it is possible to reliably realize wireless transmission at intervals of 3 seconds including transmission of the authentication signal 23 and the authentication signal (2) 25.

  In the present embodiment, it has been described that the wireless device A1 does not operate at all during the “operation stop mode”. However, for example, the timer unit B10 returns to the “operation stop mode” every 250 ms and the timer means B10 is set to 3 seconds. It is possible to confirm whether or not the measurement has been completed. If the measurement has not been completed, the movement may again be in the “operation stop mode”.

Alternatively, the timer unit B10 measures 250 ms, and each time the wireless device A1 returns from the “operation stop mode” and increments (or decrements) the counter, 250 ms × 12 times = 3 seconds, and the high-speed clock The generator 4 may start oscillation, wait for an oscillation stabilization time, and then switch to the “high-speed operation mode” to perform wireless transmission.

(Embodiment 2)
FIG. 6 shows an authentication mode sequence between the wireless device A1 and the wireless device B in the second embodiment of the present invention.

  In FIG. 6, as in the first embodiment, the wireless device A1 and the wireless device B have a pair of the confirmation signal (1) 23 and the authentication signal (1) 24 or the authentication signal (2) every 24 seconds. 25 and the authentication response signal (1) 26 are alternately communicated. For example, as shown in FIG. 6, the wireless device A1 transmits an authentication signal to the confirmation signal (1) 23 transmitted by the wireless device A1. (1) Consider a case where 24 cannot be received.

  If the wireless device A1 cannot receive the authentication signal (1) 24, the authentication signal (1) 24 transmitted by the wireless device B may not reach the wireless device A1 for some reason as shown in FIG. The wireless device A1 was able to receive the authentication signal (1) 24. However, as a result of analyzing the contents of the message, if the authentication signal (1) 24 was not correct, or the confirmation signal (1) 23 transmitted by the wireless device A1. Does not reach radio B, or has reached radio B but the contents of the message are not the correct confirmation signal (1) 23 and radio B does not transmit authentication signal (1) 24 Can be considered.

  Considering such a case, when the wireless device A1 cannot correctly receive the authentication signal (1) 24, it retransmits the confirmation signal (1) 27 for a predetermined number of times. On the other hand, assuming that a retransmission may be received from the wireless device A1, the wireless device B waits to receive the retransmission 27 of the confirmation signal (1). When the retransmission 27 of the confirmation signal (1) is received, the retransmission 28 of the authentication signal (1) is transmitted to the wireless device A1. When the wireless device A1 normally receives the retransmission 28 of the authentication signal (1), the wireless device A1 considers that the authentication communication every 24 seconds is established.

  If the wireless device A1 retransmits the predetermined number of times and the retransmission 28 of the authentication signal (1) from the wireless device B is not normally received, both the wireless device A1 and the wireless device B are searched. Return to mode and start over from each other's capture action.

  In this way, when retransmission occurs in the authentication communication every 24 seconds in the authentication mode between the wireless device A1 and the wireless device B, as shown in FIG. 6, the communication timing every 3 seconds and every 24 seconds in the authentication mode. Will be changed.

  That is, the wireless device A1 transmits the next simple ID 22 3 seconds after the transmission timing of the retransmission 27 of the confirmation signal (1) in the successful retransmission communication, and the retransmission 27 of the confirmation signal (1) in the successful retransmission communication. The next authentication communication is performed 24 seconds after the transmission timing. Conversely, the wireless device B also receives the simple ID 22 or performs authentication communication at that timing.

  Even in such a case, similarly to the first embodiment, the wireless device A1 must transmit the simple ID 22 exactly 3 seconds after the transmission timing of the retransmission 27 of the confirmation signal (1) in the successful retransmission communication.

  Here, as long as retransmission communication is performed a predetermined number of times, the wireless device A1 remains in the “high-speed operation mode” as in the first embodiment. Therefore, as in the first embodiment, considering the operation time in the “low-speed operation mode” and the oscillation stabilization waiting time of the oscillator of the high-speed clock generation unit 4, a time shorter than 3 seconds is measured accordingly. In this case, after the next time, 3 seconds must be measured as shown in FIG. 4, and the wireless device A1 must be configured to measure two times.

  In order to solve such a problem, in the present embodiment, the wireless device A1 is operated as follows according to the flowchart of FIG.

  First, after transmitting the confirmation signal (1) 23 that is the initial transmission (S33), the wireless device A1 waits to receive the authentication signal (1) 24 that is the initial transmission response (S18), and is the initial transmission response. If the authentication signal (1) 24 has been correctly received, the process shifts to the “low-speed operation mode” (S23), stops the oscillation of the high-speed clock generation means 4 (S24), and “operation stop mode”. (S25).

  Then, when the 3-second timer measured by the timer means B10 continues from the timing at which the confirmation signal (1) 23 as the initial transmission is timed up (S26), the "low speed operation" is changed from the "operation stop mode". Mode "(S28), the oscillation of the high-speed clock generation means 4 is started (S27), and after sufficiently waiting for the oscillation stabilization time (S29), the mode is switched to the" high-speed operation mode "(S30), and the simple ID 22 is transmitted. (S32). Note that the process of shifting to the “high-speed operation mode” is performed by high-speed transition means (not shown).

  On the other hand, when it is determined that the authentication signal (1) 24, which is the initial transmission response, has not been correctly received, the wireless device A1 retransmits the confirmation signal (1) 27 a predetermined number of times. If it is determined that the authentication signal (1) 24 has not been correctly received even after a predetermined number of retransmissions (S19), the wireless device A1 shifts to the “search mode”.

  Here, in order to retransmit the confirmation signal (1) 27, the wireless device A1 resets and starts the timer means B10 that is continuously measuring for 3 seconds (S20). The reset start timing is the time of the “low-speed operation mode” while waiting for the oscillation stabilization of the high-speed clock generation means 4 in FIG. 4 from the timing of transmitting the retransmission 27 of the confirmation signal (1) thereafter. This is a timing retroactive from the transmission timing of the authentication signal (2) 20.

  In order to measure the timing of the retroactive time in time series, the timer means A9 is operated (S20), and when the timer means A9 completes the measurement (S21), the synchronization start means 11 is operated and checked. The retransmission 27 of the signal (1) is transmitted from the transmission means 12 to the wireless device B via the antenna 2 (S22).

  At this time, the wireless device A1 resets the timer means B10 and waits for the time of “low speed operation mode” while waiting for the oscillation stabilization of the high speed clock generation means 4, and then the confirmation signal (1) The transmission timing of the retransmission 27 of the confirmation signal (1) is determined in advance between the wireless device A1 and the wireless device B so as to transmit the second retransmission 27.

  With the configuration as described above, the wireless device A1 can reliably determine the timer unit B10 even when retransmission occurs by measuring only 3 seconds, which is a predetermined transmission interval of the simple ID 22. Communication of a simple ID 22 at a predetermined timing, a pair of a confirmation signal (1) 23 and an authentication signal (1) 24, or a pair of an authentication signal (2) 25 and an authentication response signal (1) 26. It becomes possible.

(Embodiment 3)
FIG. 8 shows an authentication mode sequence between the wireless device A and the wireless device B in the third embodiment of the present invention.

When the wireless device A1 transmits a message to the wireless device B, the wireless device A1 must create a transmission message. The creation of the message depends on the length of the message, but the data determined in advance by this system must be created. Even when the wireless device A1 is operating in the “high-speed operation mode”, various calculations are involved. , Takes some time.

  Further, in this system, since the wireless device A1 and the wireless device B are wireless communication, they are easily affected by noise and interference. Therefore, even if redundancy is increased in the transmitted message, an error correction code such as CRC or BCH is added, and even if data corruption occurs due to noise or interference, the reliability and reliability of communication can be improved by error detection and error correction. It is also necessary to devise ways to improve the performance.

  In this case, in order to add an error correction code such as CRC or BCH to the message, a special operation corresponding to the error correction code is required. In this case, the radio A1 operates in the “high-speed operation mode”. Even if it is, it will take some time.

  Under the conditions as described above, the wireless device A1 generates a transmission message after returning to the “high-speed operation mode” at the timing of 3 seconds. Thus, as in the first and second embodiments, radio waves cannot be transmitted exactly at intervals of 3 seconds.

  In order to solve such a problem, in the present embodiment, the wireless device A1 is operated as follows according to the flowchart of FIG.

  In FIG. 8, after transmitting the last authentication signal (2) 20 in the initial authentication mode and receiving the authentication response signal (1) 21 from the wireless device B, the wireless device A1 transitions to the authentication mode. Instead of immediately shifting to the “operation stop mode”, first, in the authentication mode, a simple ID 22 to be transmitted first is created and stored in the transmission buffer.

  Then, after the simple ID 22 is created and stored in the transmission buffer 20, the mode is changed to the “low speed operation mode”, the oscillation of the high speed clock generation means 4 is stopped, and the mode is changed to the “operation stop mode”.

  In this way, the timer means B10 completes the measurement for 3 seconds, the wireless device A1 transitions from the “operation stop mode” to the “low speed operation mode”, and starts the oscillation of the high speed clock generation means 4, After switching to the “high-speed operation mode” after sufficiently waiting for the oscillation stabilization time, since the simple ID 22 to be transmitted is already stored in the transmission buffer, the simple ID 22 is immediately created without creating a message of the simple ID 22 at that time. Can be sent to.

  Thereby, the transmission interval of the first simple ID 22 in the authentication mode can be exactly 3 seconds from the last authentication signal (2) 20 in the initial authentication mode.

  Next, until the authentication communication of 24 seconds, the wireless device A1 repeats the transmission of the simple ID 22 at intervals of 3 seconds. Since the simple ID 22 at this time is the same message, the transmission message of the simple ID 22 is sent every time. There is no need to create it, and since the message of the simple ID 22 created at the end of the initial authentication mode is still stored in the transmission buffer, it is simple immediately after switching to the “high-speed operation mode” at the timing of 3 seconds. ID22 can be transmitted.

  Unlike the present embodiment, in a system in which the content of the message of the simple ID 22 is different every 3 seconds, or in a system that receives a response message from the wireless device B in response to the transmission of the simple ID 22, the relationship of constraints such as memory In the system where the transmission buffer and the reception buffer are rewritten at the same time, the transmission buffer is rewritten at the time of reception. If a message of the simple ID 22 is created and stored in the transmission buffer (S50), the simple ID 22 can be transmitted exactly every 3 seconds.

  Next, the operation of the wireless device A1 at the timing of 24 seconds will be described with reference to FIG.

  First, at the timing of 21 seconds 3 seconds before the timing of 24 seconds, the wireless device A1 transmits the seventh simple ID 22 (S48), and then transmits in the next 24 seconds before shifting to the “operation stop mode”. Either the confirmation signal (1) 23 or the authentication signal (2) 25 to be set is set in the transmission buffer (S51). When the timing of 24 seconds comes, the wireless device A1 switches to the “high-speed operation mode” and immediately transmits the confirmation signal (1) 23 or the authentication signal (2) 25 already set in the transmission buffer. (S52).

  After transmitting the confirmation signal (1) 23 or the authentication signal (2) 25, the wireless device A1 waits to receive either the authentication signal (1) 24 or the authentication response signal (1) 26 (S34). If either the signal (1) 24 or the authentication response signal (1) 26 is correctly received (S34), a simple ID 22 to be transmitted after the next 3 seconds is created and set in the transmission buffer (S38). Thereafter, transition to the “low-speed operation mode” (S39) stops the oscillation of the high-speed clock generation means 4 (S40), transitions to the “operation stop mode” (S41), and waits for 3 seconds.

  When either the authentication signal (1) 24 or the authentication response signal (1) 26 cannot be correctly received (S34), the wireless device A1 retransmits the confirmation signal (1) 27 or authentication as in the second embodiment. The signal (2) is retransmitted (not shown) a predetermined number of times (S37).

  Here, as in the case of creating the simple ID 22 described above, the transmission buffer is rewritten at the time of reception because the message is different between the initial transmission and the retransmission, or because the transmission buffer and the reception buffer are shared due to restrictions on memory and the like. In such a system, when it is determined that either the authentication signal (1) 24 or the authentication response signal (1) 26 cannot be correctly received, the wireless device A1 retransmits the confirmation signal (1) 27 or the authentication signal. The retransmission in (2) is set in the transmission buffer (S36).

  With the configuration as described above, the wireless device A1 can transmit radio waves exactly at intervals of 3 seconds without being influenced by the creation time of the transmission message.

  Note that the means described in this embodiment causes hardware resources such as a CPU (or microcomputer), a RAM, a ROM, a storage / recording device, an electrical / information device including an I / O, a computer, a server, and the like to cooperate. You may implement with the form of a program. In the form of a program, new functions can be easily distributed / updated and installed by recording them on a recording medium such as magnetic media or optical media or distributing them via a communication line such as the Internet.

  As described above, the present invention can provide an electronic device that can achieve both the battery life and misplacement of the wireless key and the convenience of preventing theft. In addition, it can be used in a wireless device that requires low power consumption.

  For example, in this embodiment, a mobile phone authentication system has been described as an example, but in addition, a personal computer authentication system, a home / office locking / unlocking authentication system, an automobile or other locking / unlocking system, Entrance / exit management of buildings and offices, provision of services using location information, start / stop of supply of lifelines such as electricity, gas, and water, start / stop of boiling water heaters, AV equipment such as TVs, radios, and personal computers It can be used for devices and systems in various fields such as lighting / washing machine / air conditioner / refrigerator / on / off control of home appliances such as a microwave oven, and heating / cooling ON / OFF control of a hot water washing toilet seat.

Block diagram of radio A in Embodiment 1 of the present invention Communication sequence diagram in search mode and initial authentication mode of wireless system in embodiment 1 of the present invention Communication sequence diagram in authentication mode of wireless system in embodiment 1 of the present invention The sequence diagram which showed the transmission interval of the simple ID signal of the authentication mode in Embodiment 1 of this invention Operation flowchart of wireless device A according to Embodiment 1 of the present invention Communication sequence diagram in authentication mode in Embodiment 2 of the present invention Operation flowchart of wireless device A in the second embodiment of the present invention Communication sequence diagram in authentication mode in Embodiment 3 of the present invention Operation flowchart of wireless device A according to Embodiment 3 of the present invention

Explanation of symbols

1 Radio A
2 antenna 3 control means 4 high speed clock generation means 5 low speed clock generation means 6 high speed clock control means 7 stop means 8 low speed transition means 9 timer means A
10 Timer means B
11 synchronization starting means 12 transmitting means 13 receiving means

Claims (3)

It consists of radio A and radio B,
Between the wireless device A and the wireless device B, at least two modes of an asynchronous communication mode for performing asynchronous communication that does not synchronize with each other in time and a synchronous communication mode for performing synchronous communication with time synchronization with each other Having
In the asynchronous communication mode, the wireless device A operates while maintaining itself at a high speed operation, and in the synchronous communication mode, the wireless device A transitions to at least two states of high speed operation and stop operation. In a wireless device that operates while
The wireless device A includes a high-speed clock generation unit that generates a clock for operating at high speed, and a transmission unit that transmits a radio signal when the wireless device A is in the high-speed operation.
The high-speed clock generation means is stably generated before transmitting a signal in the synchronous communication mode, which is activated when a signal for transition to the synchronous communication mode from the wireless device B is received in the asynchronous communication mode. Timer means A for measuring the time until
Timer means B, which is activated at the same timing as activation of the timer means A, measures time for transmitting a signal at a constant interval to the wireless device B in the synchronous communication mode;
Synchronization start means for starting the transmission means first in the synchronous communication mode when the timer means A completes measurement;
High-speed clock control means for turning ON / OFF the high-speed clock generation means;
A stopping means for shifting itself from a high speed operation to a stopping operation after turning off the operation of the high speed clock generating means using the high speed clock control means;
When the timer means B completes the measurement of a certain time, after the high-speed clock generation means is turned on using the high-speed clock control means, the high-speed clock generation means is operated using the high-speed clock control means. High-speed transition means that shifts itself from stop operation to high-speed operation after being turned on,
A wireless device composed of In the case where the wireless device A receives a response signal from the wireless device B after transmitting a wireless signal using the transmitting means in the synchronous communication mode,
A receiving means for receiving and analyzing the response signal when the device itself operates at high speed, and a timer means A is activated and the timer means B is restarted when the receiving means cannot receive the response signal correctly. The radio apparatus according to claim 1, comprising timer activation means to be activated and retransmission means for retransmitting the radio signal using the transmission means when the timer means A completes measurement. The wireless device A activates the stopping unit after transmitting a wireless signal using the transmitting unit and before starting the stopping unit or after determining that the receiving unit has correctly received the response signal. A transmission message creating means for creating and storing the next transmission message before, and the transmission means transmits the stored transmission message without creating a transmission message after the transition to the high-speed operation; The radio apparatus according to claim 1 or 2.

Images