JP2006186474A - Wireless communication system and wireless repeater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system in which power consumption is reduced when a wireless communication device is not performing information communication and information communication can be resumed smoothly, and to provide a wireless repeater being employed in communication between wireless communication devices. <P>SOLUTION: Each wireless communication processing terminal 3 configuring an autonomous distributed wireless network 1 comprises a synchronous clock for synchronizing communication, and a power supply control section for controlling the wireless communication processing terminal 3 between wake-up state and sleeping state. The power supply control section brings the wireless communication processing terminal 3 into wake-up state at a predetermined time interval according to ticking of the synchronous clock, and synchronizes the synchronous clock of other wireless communication processing terminal 3 and its own synchronous clock during wake-up state. Consequently, power consumption can be reduced in sleeping state and a processing for starting information communication by making a transition from the sleeping state to the wake-up state can be carried out smoothly. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless communication system that establishes communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device, and communication performed between the wireless communication devices. The present invention relates to a wireless repeater used.

  Workers can move freely within the construction site and event venue setting sites such as concerts and theaters, and must exchange information with other workers and site supervisors. In this case, it is conceivable that each worker carries an information processing terminal equipped with a communication means in order to exchange information.

  In such a situation, since the information processing terminal moves together with the worker, it is not preferable to construct a communication network between the information processing terminals by wired connection. Therefore, it is conceivable to construct an autonomous distributed wireless network by providing wireless communication means such as a wireless module in the information processing terminal. Hereinafter, an information processing terminal provided with wireless communication means is referred to as a wireless information processing terminal.

  In an autonomous distributed wireless network, wireless information processing terminals exchange information with other wireless information processing terminals by wireless communication, and operate as wireless relays in wireless communication between wireless information processing terminals performed elsewhere. For this reason, a base station apparatus and an access point are not required, a network can be constructed at a low cost in a place having no infrastructure, and a simple network in a limited area can be constructed.

  As a wireless information processing terminal constituting an autonomous distributed wireless network, there are a PDA equipped with a wireless module, a personal computer equipped with a wireless module, and the like. Since these terminals can be carried and used by the user, it is necessary to operate them with a battery.

  In order to prolong the duration of the battery, while the wireless information processing terminal is not performing information communication, supply power only to the components essential to smoothly resume information communication. It is preferable that no power is supplied to these components. Information communication here refers to the transmission of information and content for communication, excluding communication performed exclusively for operation control between wireless information processing terminals and communication performed exclusively for signal synchronization processing. This refers to communication for sending and receiving information.

  In an autonomous distributed wireless network, each wireless information processing terminal transmits and receives digital signals. For this reason, the phase of the digital signal recognized by each wireless information processing terminal must be synchronized with the phase of the digital signal recognized by the wireless information processing terminal of the other party of information communication. In order to perform phase synchronization of digital signals, each wireless information processing terminal is generally provided with a clock signal generation source, and the time increment of the clock signal generation source is determined by the clock signal generation source of the counterpart wireless information processing terminal via wireless communication. Synchronize with the time step. Therefore, it is conceivable to always supply power to the clock signal generation source and the wireless module.

  However, since the wireless module consumes a relatively large amount of power among the components of the wireless information processing terminal because of the need to transmit electromagnetic waves in the distance, constantly supplying power will significantly shorten the battery duration. That is not preferable.

  The present invention has been made for such a problem, and reduces power consumption while a wireless communication device such as a wireless information processing terminal is not performing information communication, and smoothly restarts information communication. Provided are a wireless communication system capable of performing communication, and a wireless repeater used for communication performed between wireless communication apparatuses.

  The present invention is a wireless communication system that establishes communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device. Includes a synchronous clock for performing communication synchronization between wireless communication devices, and a power control unit that controls whether the wireless communication device is set to a wake-up state or a sleeping state. The wireless communication device is woken up at predetermined time intervals in accordance with the time intervals shown, and each of the plurality of wireless communication devices is synchronized with the synchronous clock provided in the other wireless communication device while the wireless communication device is in the wakeup state. It is characterized by being synchronized with.

  Further, in the wireless communication system according to the present invention, each of the plurality of wireless communication devices is based on the time increment indicated by the signal transmitted by the other wireless communication device and the synchronous clock provided in the other wireless communication device. It is preferable to adopt a configuration that synchronizes with a synchronized timepiece provided.

  In the wireless communication system according to the present invention, each of the plurality of wireless communication devices is transmitted from a reference station that transmits a time step indicated by a signal transmitted by another wireless communication device and a signal that is a reference for the time step. It is preferable to select one of the time increments indicated by the signal to be synchronized, and based on the selected time increment, synchronize the synchronization clock provided in the other wireless communication device with the synchronization clock provided by itself.

  In addition, the present invention is a wireless communication system that establishes communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device. Each transmits a synchronous clock for performing communication synchronization between wireless communication devices, a power control unit for controlling whether the wireless communication device is in a wake-up state or a sleeping state, and a signal that serves as a reference for time increments A reference station signal receiving unit that receives a signal from the reference station, and the power supply control unit wakes up the wireless communication device at a predetermined time interval according to the time increment indicated by the synchronous clock, and Each is characterized in that, while in the wake-up state, the time step indicated by the signal received by the reference station signal receiving unit is synchronized with the time step indicated by the synchronization clock provided therein.

  In addition, the present invention is a wireless communication system that establishes communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device. Each of them transmits a synchronous clock for performing communication synchronization between wireless communication devices, a power supply control unit for controlling whether the wireless communication device is in a wake-up state or a sleeping state, and a signal that serves as a reference for time increments A reference station signal receiving unit that receives a signal from the reference station, and the power supply control unit wakes up the wireless communication device at a predetermined time interval according to the time increment indicated by the signal received by the reference station signal receiving unit, Each of the plurality of wireless communication devices is characterized in that, while in the wake-up state, the time step indicated by the signal received by the reference station signal receiving unit is synchronized with the time step indicated by the synchronization clock provided by itself.

  In addition, the present invention is a wireless communication system that establishes communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device. Each includes a power supply control unit that controls whether the wireless communication device is in a wake-up state or a sleeping state, and a reference station signal reception unit that receives a signal from a reference station that transmits a signal that serves as a time step reference. The power supply control unit wakes up the wireless communication device at a predetermined time interval according to the time interval indicated by the signal received by the reference station signal reception unit, and the plurality of the time intervals indicated by the signal received by the reference station signal reception unit. It is characterized by performing communication synchronization for communication between the wireless communication devices.

  In the wireless communication system according to the present invention, it is preferable to apply a positioning satellite to the reference station.

  In addition, the present invention is a wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device, the first wireless communication device and the second wireless communication device. A synchronous clock for performing communication synchronization with the communication device, and a power supply control unit that controls whether the wireless repeater is set to a wake-up state or a sleeping state. The wireless repeater is woken up at predetermined time intervals according to the time interval, and the wireless repeater is provided in the synchronous clock and the second wireless communicator included in the first wireless communicator while in the wake-up state. It is characterized by synchronizing with either one of the synchronous watches.

  Further, in the wireless repeater according to the present invention, based on either the time increment indicated by the signal transmitted by the first wireless communication device or the time interval indicated by the signal transmitted by the second wireless communication device, It is preferable that the synchronization clock provided in the wireless communication device that has transmitted the signal indicating the time step is synchronized with the synchronization clock provided by itself.

  In addition, the present invention is a wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device, the first wireless communication device and the second wireless communication device. A synchronous clock for performing communication synchronization with the communication device, and a power supply control unit that controls whether the wireless repeater is set to a wake-up state or a sleeping state. In accordance with the time interval, the wireless repeater is woken up at predetermined time intervals, and the wireless repeater transmits either the first wireless communication device or the second wireless communication device while it is in the wakeup state. Select either the time step indicated by the signal to be transmitted or the time step indicated by the signal transmitted from the reference station that transmits the reference signal for the time step, and the time step indicated by the selected time step and the synchronous clock provided by itself It is characterized by being synchronized with.

  In addition, the present invention is a wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device, the first wireless communication device and the second wireless communication device. From a synchronous clock for performing communication synchronization with a communication device, a power control unit that controls whether the wireless repeater is set to a wake-up state or a sleep state, and a reference station that transmits a signal that is a reference for time increments A reference station signal receiving unit for receiving a signal, and the power supply control unit sets the wireless repeater in the wake-up state at a predetermined time interval according to the time interval indicated by the synchronous clock, and the wireless repeater is in the wake-up state In the meantime, the time step indicated by the signal received by the reference station signal receiving unit is synchronized with the time step indicated by the synchronization clock provided therein.

  In addition, the present invention is a wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device, the first wireless communication device and the second wireless communication device. From a synchronous clock for performing communication synchronization with a communication device, a power control unit that controls whether the wireless repeater is set to a wake-up state or a sleep state, and a reference station that transmits a signal that is a reference for time increments A power supply control unit that wakes up the wireless repeater at a predetermined time interval according to the time interval indicated by the signal received by the reference station signal receiving unit. Is characterized in that the time interval indicated by the signal received by the reference station signal receiving unit and the time interval indicated by the synchronization clock provided by itself are synchronized while in the wake-up state.

  In addition, the present invention is a wireless relay device that receives a signal transmitted from a first wireless communication device and transmits the signal to a second wireless communication device, and sets the wireless relay device to a wake-up state or a sleeping state. A power control unit that controls whether or not a reference station signal receiving unit that receives a signal from a reference station that transmits a signal that is a reference for time increments, and the power control unit receives a signal received by the reference station signal receiving unit. The wireless repeater is woken up at predetermined time intervals in accordance with the time intervals indicated, and communicates with the first wireless communication device and the second wireless communication device according to the time intervals indicated by the signal received by the reference station signal receiver. The communication synchronization for performing is performed.

  In the radio repeater according to the present invention, it is preferable to apply a positioning satellite to the reference station.

  According to the present invention, a wireless communication system and a wireless communication device capable of reducing power consumption while a wireless communication device such as a wireless information processing terminal is not performing information communication and smoothly restarting information communication are provided. It is possible to realize a wireless repeater used for communication performed between them.

1. First Embodiment A first embodiment of the present invention will be described. FIG. 1 shows the configuration of an autonomous distributed wireless network 1 according to this embodiment, and FIG. 2 shows the configuration of a wireless information processing terminal 3 for constructing it. In this autonomous distributed wireless network 1, a communication wake-up state in which information communication is performed between the wireless information processing terminals 3 and information communication is not performed between the wireless information processing terminals 3, but information communication is started again. There is a standby sleeping state that is a state for smoothly performing the operation at the time. In the standby sleeping state, each wireless information processing terminal 3 is in a state in which power is not supplied except for components that are indispensable for smoothly performing an operation when information communication is started again.

(1) Communication wakeup state First, the operation of the autonomous distributed wireless network 1 in the communication wakeup state will be described. Each wireless information processing terminal 3 is given an identification code. Then, the wireless information processing terminal 3 serving as the information transmission source designates the identification code of the receiving wireless information processing terminal 3 as the destination. When the information to be transmitted is included in the transmission signal, the transmission source wireless information processing terminal 3 also includes the destination information of the reception destination wireless information processing terminal 3. This information to be transmitted is hereinafter referred to as communication target information. The wireless information processing terminal 3 that has received the signal transmitted from the transmission-source wireless information processing terminal 3 reads the destination included in the received signal and compares it with its own identification code. Thereby, when the communication target information included in the received signal is not addressed to itself, a relay process for transmitting the received signal to another wireless information processing terminal 3 is performed. In the relay process, the electric field strength of the received signal is measured, and the received signal is transmitted to another wireless information processing terminal 3 only when this satisfies a predetermined condition. By doing in this way, it can avoid that the signal containing the same information is transmitted again in the some wireless information processing terminal 3, and the signal transmitted from the wireless information processing terminal 3 of the transmission source passes through the optimal route. So-called routing to be transmitted to the receiving wireless information processing terminal 3 is performed. Routing is nothing other than autonomously forming a service area between a plurality of specific wireless information processing terminals 3 in the autonomous distributed wireless network 1. If the wireless information processing terminal 3 operating as a wireless repeater in routing moves out of the autonomously formed service area, the information processing between the wireless information processing terminals 3 that has been capable of information communication so far Information communication becomes impossible. This phenomenon can be positively used as theft detection of the wireless information processing terminal 3.

  When the communication target information included in the received signal is addressed to itself, the communication target information included in the received signal is taken into the wireless information processing terminal 3 without performing relay processing. In FIG. 1, if the wireless information processing terminal 3 as the transmission source is the wireless information processing terminal 3A and the wireless information processing terminal 3 as the reception destination is the wireless information processing terminal 3Z, the wireless information processing terminal 3A and the wireless information processing terminal 3Z are excluded. The other wireless information processing terminal 3 can operate as a wireless repeater.

  In the autonomous distributed wireless network 1, each wireless information processing terminal 3 transmits and receives digital signals. For this reason, the phase of the digital signal recognized by each wireless information processing terminal 3 must be synchronized with the phase of the digital signal recognized by the wireless information processing terminal 3 of the other party of information communication. In order to perform phase synchronization of digital signals, each wireless information processing terminal 3 includes a synchronous clock 26 that is a clock signal generation source, and the wireless information processing terminal 3 of the other party includes the time increment of the synchronous clock 26 via wireless communication. Synchronization processing is performed in accordance with the time increment of the synchronous clock 26.

  In the present embodiment, the signal transmitted by each wireless information processing terminal 3 is digitally modulated with a modulation frequency predetermined by the design specification. Therefore, each wireless information processing terminal 3 detects a modulation frequency and digitally demodulates a signal received from another wireless information processing terminal 3, generates a phase reference signal, and performs synchronization processing using the phase reference signal. Do. That is, in the communication wake-up state, each wireless information processing terminal 3 performs information communication while performing synchronization processing with other wireless information processing terminals 3.

  Next, a specific operation of the wireless information processing terminal 3 in the communication wake-up state will be described with reference to FIG. The wireless information processing terminal 3 includes an information processing terminal 50 and a wireless module 40. These may be integrated as a PDA equipped with a wireless circuit, or the information processing terminal 50 may be configured separately as a so-called small personal computer and a wireless card on which the wireless module 40 is mounted. Good.

  The information processing terminal 50 can execute application software for communication under the execution of the operation system software. When the communication target information such as a document, an image, a moving image, and a sound is transmitted to another wireless information processing terminal 3 by executing the application software, the information processing terminal interface 12 included in the wireless module 40 from the information processing terminal 50 is used. These pieces of communication target information are input. The information processing terminal interface 12 is an interface that matches the communication protocol between the wireless communication performed by the wireless module 40 and the information processing terminal 50 that executes application software for communication. Communication protocol matching is an operation for communication between communication media with different communication methods so that communication is possible. The hardware control of the wireless module 40 by the terminal 50 is also included. Further, in the application software for communication, the identification code of the wireless information processing terminal 3 that is the receiving destination can be specified, and this can be included in the communication target information as the destination.

  The information processing terminal interface 12 that has acquired the communication target information from the information processing terminal 50 transmits a signal including the communication target information from the antenna 16 via the transmission unit 14. Note that the information processing terminal interface 12 and the information processing terminal 50 operate according to a clock signal output from the synchronous clock 26 included in the wireless module 40. The synchronous clock 26 is synchronized with a digital signal handled by the wireless information processing terminal 3 of the other party of information communication by a communication wake-up synchronization process or a standby sleep synchronization process described later.

  The reception unit 18 of the wireless information processing terminal 3 receives a signal from another wireless information processing terminal 3 via the antenna 16 and inputs the signal to the relay processing unit 20. The relay processing unit 20 reads the destination included in the communication target information of the received signal and compares it with its own identification code stored in the identification code storage unit 30.

  As a result of the comparison and collation, when the destination included in the communication target information does not match its own identification code, it is determined whether or not the electric field strength of the received signal is greater than or equal to a predetermined value. When it is determined that the electric field strength of the received signal is greater than or equal to a predetermined value, the received signal is input to the transmitter 14 and the received signal is transmitted as a relay transmission signal via the antenna 16. When it is determined that the electric field strength of the received signal is less than a predetermined value, the process is terminated without transmitting such a relay transmission signal. Further, the relay processing unit 20 detects the remaining battery level of its own wireless information processing terminal 3, and terminates the process without transmitting the relay transmission signal when the remaining battery level is less than a predetermined value. A configuration is also possible. With such an operation, it is determined whether or not each wireless information processing terminal 3 operates as a wireless repeater in routing.

  If the information included in the received signal is addressed to itself, the received signal is input to the information processing terminal interface 12 without performing the relay process. The information processing terminal interface 12 inputs the communication target information included in the received signal to the information processing terminal 50 that executes application software for communication.

  While the wireless information processing terminal 3 receives a signal from another wireless information processing terminal 3, the modulation frequency detection unit 22 included in the wireless module 40 detects the modulation frequency from the received signal, generates a phase reference signal, and performs synchronization control. Input to the unit 24. The modulation frequency detection unit 22 is also used when the reception unit 18 performs digital demodulation. In FIG. 2, the modulation frequency detection unit 22 is a component for performing synchronization processing of the synchronous clock 26. The description is independent from 18.

  The synchronization control unit 24 to which the phase reference signal is input performs synchronization processing of the synchronous clock 26 accordingly. As a result, the synchronous clock 26 keeps time in accordance with the modulation frequency detected from the received signal, and the clock signal synchronized with the digital signal handled by the wireless information processing terminal 3 of the information communication partner is used as the information processing terminal interface. 12 etc. can be supplied. Note that the synchronization processing described here is performed when the wireless information processing terminal 3 is in the communication wake-up state, and is therefore referred to as communication wake-up synchronization processing.

(2) Standby sleeping state (i) Complete sleeping state and synchronized wake-up state In the standby sleeping state, while the wireless information processing terminal 3 is not performing information communication, the power consumption is reduced and the duration of the battery is prolonged. It is a state to take to do. In order to reduce power consumption, while the wireless information processing terminal 3 is not performing information communication, power is supplied only to components that are indispensable for smoothly restarting information communication. The power is not supplied to the unit. Hereinafter, a component essential for smoothly restarting information communication is referred to as a bedtime operation unit.

  The standby sleeping state is a state on the premise that the wireless information processing terminal 3 does not perform information communication, and therefore, it may be considered that power is not supplied to all the components of the wireless module 40. However, when the wireless information processing terminal 3 resumes information communication, it takes a long time to synchronize with the digital signal handled by the wireless information processing terminal 3 of the other party of information communication, and so much information transmission is required. Time is consumed, resulting in a decrease in communication capacity. Further, when the wireless information processing terminal 3 resumes information communication, jitter is caused and communication quality is deteriorated.

  Therefore, it is also conceivable to include all the components of the wireless module 40 in the sleeping operation unit. However, since the wireless module 40 consumes relatively large power among the components of the wireless information processing terminal 3 due to the necessity of transmitting electromagnetic waves to a distant place, always supplying power will significantly shorten the battery duration. This is not preferable.

  Therefore, in the standby sleeping state according to the present embodiment, the sleeping operation unit is only the component related to the operation of the synchronous clock 26 and the power control, and the components other than the sleeping operation unit of the wireless module 40 are regularly and The synchronization process is performed by intermittently supplying power. Hereinafter, in the standby sleeping state, a state where power is supplied only to the sleeping operation unit is referred to as a complete sleeping state, and power is supplied not only to the sleeping operation unit but also to components other than the sleeping operation unit. The state is distinguished from the previous communication wake-up state and is referred to as a synchronous wake-up state. That is, the standby sleeping state includes a complete sleeping state and a synchronous wake-up state, and the wireless information processing terminal 3 alternately takes the complete sleeping state and the synchronous wake-up state in the standby sleeping state. In FIG. 2, the synchronous clock 26 and the power supply control unit 28 correspond to the bedtime operation unit, and these are shown with a thick frame. Hereinafter, also in FIGS. 5 to 7, components corresponding to the bedtime operation unit are represented by thick frames.

(Ii) Standby bedtime synchronization process In the standby bedtime state, the power control unit 28 of each wireless information processing terminal 3 applies only to the bedtime operating unit during a predetermined time t ₁ according to the time counted by the synchronous clock 26. a state where the power is supplied during the time t ₂ controls the wireless module 40 in a state where power is supplied to components all wireless module 40. As a result, the operation of going into the complete sleeping state during the time t _{1 and} the synchronous waking up state during the next time t ₂ is repeated. Time t ₁ and time t ₂ may be determined in advance in the design specification of the autonomous distributed wireless network 1. Here, it is preferable that the time and time t ₁ at which the user fully sleeps and the time and time t _{2 at} which the synchronous wake-up state is established are completely synchronized among all the wireless information processing terminals 3. Since the time is grasped by the synchronous clock 26 of each of the plurality of wireless information processing terminals 3, a slight difference occurs. However, there is no problem in the system operation as long as this shift is within a range in which the standby bedtime synchronization process described below can be executed.

  In the standby bedtime synchronization process, the transmission unit 14 generates a synchronization signal subjected to digital modulation based on the clock signal output from the synchronization clock 26, and transmits the synchronization signal from the antenna 16 to another wireless information processing terminal 3. Here, the synchronization signal includes information about its own identification code.

  The receiving unit 18 of each wireless information processing terminal 3 receives the synchronization signal transmitted from the other wireless information processing terminal 3 via the antenna 16. The receiving unit 18 reads the identification code of the wireless information processing terminal 3 that is the transmission source from the received synchronization signal, and compares it with its own identification code stored in the identification code storage unit 30. It is assumed that the identification code has a magnitude relationship, and the modulation frequency detector 22 is used only when the identification code of the wireless information processing terminal 3 that is the transmission source of the synchronization signal is smaller than its own identification code as a result of comparison and collation. The modulation frequency is detected by the above. Needless to say, the modulation frequency detection unit 22 may perform modulation frequency detection only when the identification code of the wireless information processing terminal 3 that is the transmission source of the synchronization signal is larger than its own identification code.

  The phase reference signal output from the modulation frequency detection unit 22 is input to the synchronization control unit 24, and the synchronization control unit 24 performs synchronization processing of the synchronous clock 26 accordingly. As a result, the synchronous clock 26 can synchronize with the synchronous clock 26 included in the wireless information processing terminal 3 having an identification code smaller than its own identification code, and the wireless information processing terminal 3 that constructs the autonomous distributed wireless network 1. By performing such a synchronization process, the autonomous distributed wireless network 1 as a whole establishes the synchronization state in the standby sleeping state. Such a process for establishing the synchronization state in the standby sleeping state is referred to as a standby sleeping synchronization process, and this term will be used hereinafter with this definition.

(Iii) Resumption of information communication Note that the standby sleeping state is a state in which information communication is not performed, but the resumption of information communication is performed in response to a synchronous wake-up state. That is, the wireless information processing terminal 3 that intends to resume the information communication generates a signal including the identification number of the other party of the information communication by the application software for communication, and calls this signal during the period when it is in the synchronous wake-up state. Send it to the other party as a signal. The other party's wireless information processing terminal 3 that has received the call signal recognizes that it has been requested to start information communication to itself, and transmits a response signal to the wireless information processing terminal 3 that has transmitted the call signal. Then, the wireless information processing terminal 3 that has received the response signal performs a process of transitioning to the communication wake-up state and starting information communication. The transmission / reception of the call signal and the response signal described here is performed by the same processing as the communication in the communication wake-up state described above. A specific operation will be described below.

  In the application software for communication, the communication target information includes the identification code of the other party from whom information communication is to be resumed and information indicating that information communication is to be performed. The communication target information is input to the information processing terminal interface 12, and the information processing terminal interface 12 to which the communication target information is input transmits a signal including the communication target information from the antenna 16 via the transmission unit 14. The signal transmitted in this way is a call signal.

  The reception unit 18 of the wireless information processing terminal 3 receives a call signal from another wireless information processing terminal 3 via the antenna 16 and inputs the call signal to the relay processing unit 20. The relay processing unit 20 reads the destination included in the communication target information of the received call signal, and compares it with its own identification code stored in the identification code storage unit 30.

  As a result of the comparison and collation, when the destination included in the communication target information does not match its own identification code, it is determined whether the electric field strength of the received signal is equal to or greater than a predetermined value. When it is determined that the electric field strength of the received signal is greater than or equal to a predetermined value, the received signal is input to the transmitter 14 and the received signal is transmitted as a relay transmission signal via the antenna 16. When it is determined that the electric field strength of the received signal is less than a predetermined value, the process is terminated without transmitting such a relay transmission signal. By such an operation, it is determined whether or not each wireless information processing terminal 3 operates as a wireless repeater that participates in routing.

  When the information included in the received call signal is addressed to itself, the received signal is input to the information processing terminal interface 12 without performing the relay process. The information processing terminal interface 12 inputs the communication target information included in the received signal to the information processing terminal 50 that executes application software for communication.

  The information processing terminal 50 that executes application software for communication transmits to the wireless information processing terminal 3 that has transmitted the calling signal, the wireless information processing that has transmitted the calling signal in order to notify that the information communication can be resumed. The identification code of the terminal 3 and information indicating that information communication is possible are included in the communication target information. The communication target information is input to the information processing terminal interface 12, and the information processing terminal interface 12 to which the communication target information is input transmits a signal including the communication target information from the antenna 16 via the transmission unit 14. The signal transmitted in this way is a response signal.

  The response signal is transmitted to the wireless information processing terminal 3 that has transmitted the call signal through the same route as the transmission of the call signal. The wireless information processing terminal 3 that has received the response signal performs a process of transitioning to a communication wake-up state and restarting information communication.

  When the wireless information processing terminal 3 that has received the call signal is in an information communication disabled state, information indicating that information communication is not possible is included in the communication target information of the response signal. , The wireless information processing terminal 3 recognizes that the other party who is going to resume information communication from now on cannot communicate information.

(Iv) Explanation Based on Timing Chart FIG. 3 shows the timing of main processing executed by the wireless information processing terminal 3 in each of the above-described communication wake-up state and standby sleep state. The wireless information processing terminal 3 is in a communication wake-up state until time T _s , and performs information communication with other wireless information processing terminals 3. Thereafter, the state transits to the standby sleeping state, and the complete sleeping state taken during the time t _{1 and} the synchronous wake-up state taken during the time t ₂ are alternately repeated, and the standby sleeping synchronous process is performed in the synchronous wake-up state. Then, in synchronization wakeup state starting from the time T _t receive the transmission and response signal to that of the calling signal is performed, a COMMUNICATION wakeup state again at time T _u, with another wireless information processing terminal 3 The information communication is started. Note that, as described above, power is supplied only to the sleeping operation unit in the complete sleeping state, and power is supplied to the entire wireless module 40 in the communication wake-up state and the synchronous wake-up state.

(V) Standby bedtime synchronization process of the wireless information processing terminal 3 not participating in routing As described above, in the autonomous distributed wireless network 1, the signal transmitted from the wireless information processing terminal 3 of the transmission source has an optimum route. Then, so-called routing is performed, which is a process transmitted to the wireless information processing terminal 3 that is the reception destination. At this time, some of the plurality of wireless information processing terminals 3 that construct the autonomous distributed wireless network 1 do not participate in routing, and even such wireless information processing terminals 3 also participate in routing. It is wasteful to execute the standby bedtime synchronization process at the same time interval as 3 from the viewpoint of power consumption.

Therefore, the wireless information processing terminal 3 that does not participate in routing is preferably configured to take a synchronous wake-up state at a time interval longer than t ₁ . For example, if t ₁ + n (t ₁ + t ₂ ) (n is an integer equal to or greater than 1), the standby information is synchronized at a cycle of n times the cycle at which the wireless information processing terminal 3 participating in the routing performs the synchronization processing at standby. Processing will be performed. In this case, if n is increased too much, the number of wireless information processing terminals 3 that should operate as wireless relays decreases when other wireless information processing terminals 3 transition from the standby sleeping state to the communication wake-up state. There is a risk of hindering the state transition operation. Therefore, it is preferable to determine the value of n in view of the interest of increasing it.

(Vi) Problems in the First Embodiment In the above (ii), the time t _{1 at} which a complete sleeping state is obtained is grasped by each synchronous clock 26 of the plurality of wireless information processing terminals 3. There was a difference between the processing terminals 3, and this difference was pointed out that there is no problem in the system operation as long as the standby bedtime synchronization process can be executed. However, if the difference in time t ₁ occurring between the wireless information processing terminals 3 is too large, it becomes impossible to execute the standby bedtime synchronization process, which hinders the smooth restart of information communication. Result.

In the autonomous decentralized wireless network 1 according to the present embodiment, the time lag of time t ₁ that occurs between the wireless information processing terminals 3 greatly depends on the frequency accuracy of the synchronous clock 26. Obviously, such a problem can be solved by using an oscillator. However, since the cost of a high-accuracy oscillator is high and the design is not easy, it is desirable to have a system configuration in which the performance does not depend on the accuracy of the oscillator as much as possible. The embodiment described below addresses such a problem.

2. Second Embodiment FIG. 4 shows the configuration of an autonomous distributed wireless network 2 according to the second embodiment, and FIG. 5 shows the configuration of a wireless information processing terminal 5 that constructs the same. In this wireless information processing terminal 5, the wireless information processing terminal 3 according to the first embodiment is provided with means for receiving a signal from a time step reference station for transmitting a signal that becomes a reference for time step. Here, as the time step reference station, a base station device 62 provided separately from the wireless information processing terminal 5 in a service area formed by the autonomous distributed wireless network 2, a positioning satellite such as a GPS satellite, or the like may be applied. it can. In this embodiment, a positioning satellite 60 such as a GPS satellite is applied as the time step reference station.

  As in the first embodiment, when the wireless information processing terminal 5 as the transmission source is the wireless information processing terminal 5A and the wireless information processing terminal 5 as the reception destination is the wireless information processing terminal 5Z, the wireless information processing terminal 5B and the wireless information processing terminal The terminal 5C can operate as a wireless repeater. The wireless information processing terminal 5 includes a wireless module 42 and an information processing terminal 50. In the satellite positioning system, the signal transmitted by the positioning satellite 60 includes information related to the signal transmission time. This transmission time is engraved based on a clock provided in the positioning satellite 60.

  In general, in a satellite positioning system, a satellite positioning receiver reads a transmission time from a signal transmitted from a positioning satellite 60 and compares it with the current time to propagate a signal from the positioning satellite 60 to the satellite positioning receiver. The time is calculated, and the distance from the positioning satellite 60 is calculated from this and the propagation speed of the signal.

  In the present embodiment, the signal transmitted from the positioning satellite 60 is not used for calculating the distance from the positioning satellite 60, but is used for the standby sleeping synchronization process in the standby sleeping state. That is, since the signal transmitted from the positioning satellite 60 includes information on the transmission time of the signal, the signal is received at predetermined time intervals to synchronize with the clock of the positioning satellite 60. is there. The time interval for receiving the signal transmitted from the positioning satellite 60 may be the same as the time interval for obtaining the synchronized wake-up state.

  Needless to say, the signal transmitted from the positioning satellite 60 can be used for calculating the distance from the positioning satellite 60 and used for the original positioning calculation.

  Based on the above, the operation in the communication wake-up state and the standby sleeping state of the autonomous distributed wireless network 2 of the second embodiment will be described for each state. Detailed description of the same operation as that of the first embodiment is omitted.

(1) Communication wake-up state The operation of the wireless information processing terminal 5 in the communication wake-up state is the same as the operation of the wireless information processing terminal 3 according to the first embodiment. The communication wake-up synchronization process is performed based on the phase reference signal output from the modulation frequency detector 22. This phase reference signal is not generated during the standby bedtime synchronization process.

(2) Standby sleeping state In the standby sleeping state, the power control unit 28 of the wireless information processing terminal 5 is in a state in which power is supplied only to the sleeping operating unit for a predetermined time t ₁ at the time t ₂ . In the meantime, the wireless module 42 is controlled so that power is supplied to all the components of the wireless module 42. At this time, as in the first embodiment, the power supply control unit 28 grasps the times t ₁ and t ₂ according to the synchronous clock 26.

(I) Complete sleeping state The sleeping operation unit is the power control unit 28 and the synchronous clock 26, and is the same as in the first embodiment.

(Ii) Synchronous wake-up state In the synchronous wake-up state, standby sleep synchronization processing is performed. 5 receives the signal transmitted from the positioning satellite 60 via the antenna 32 and inputs it to the time step extraction unit 36. The time step extraction unit 36 reads information on the transmission time from the signal input from the reference station signal reception unit 34, generates a phase reference signal based on the information, and inputs the phase reference signal to the synchronization control unit 24. The synchronization control unit 24 performs synchronization processing of the synchronization clock 26 based on the phase reference signal. As a result, the synchronization clock 26 can synchronize with the clock included in the positioning satellite 60, and each of the wireless information processing terminals 5 that construct the autonomous distributed wireless network 2 performs such synchronization processing, whereby the network As a whole, the synchronization state in the standby sleeping state is established.

Thus, in the present embodiment, each wireless information processing terminal 5 has the above 1. (2) The synchronization signal as described in (ii) is not transmitted, and standby bedtime synchronization processing based on the signal transmitted by the positioning satellite 60 is performed. For this reason, even if a large shift occurs between the wireless information processing terminals 5 with respect to the time t ₁ from the complete sleeping state to the synchronized wake-up state, the synchronization reference is common to all the wireless information processing terminals 5. Since this is a signal transmitted from the positioning satellite 60, it is possible to perform standby bedtime synchronization processing. In addition, it is possible to perform a standby bedtime synchronization process that is quicker and more reliable than that of the first embodiment.

3. Third Embodiment Next, a third embodiment will be described. FIG. 6 shows the configuration of the wireless information processing terminal 7 according to the third embodiment. Similarly to the wireless information processing terminal 5, the wireless information processing terminal 7 includes a wireless module 44 and an information processing terminal 50, and is applied instead of the wireless information processing terminal 5 of the autonomous distributed wireless network 2 of FIG. The wireless information processing terminal 7 is configured so that the power supply control unit 28 grasps the times t ₁ and t _{2 according} to the phase reference signal output by the time step extraction unit 36 in the standby sleeping state. That is, the power supply control unit 28 does not grasp the times t ₁ and t ₂ according to the synchronous clock 26 but grasps the times t ₁ and t ₂ based on the information regarding the transmission time included in the signal transmitted from the positioning satellite 60. To do. Therefore, power must be supplied to the reference station signal receiving unit 34 and the time interval extracting unit 36 in the complete sleeping state, and the reference station signal is added to the sleeping time operating unit in addition to the power control unit 28 and the synchronous clock 26. The receiving unit 34 and the time step extracting unit 36 are included.

  The operation of the autonomous decentralized wireless network 2 according to the third embodiment regarding the communication wake-up state and the standby sleep state will be described for each state. Detailed description of the same operations as those in the first embodiment or the second embodiment will be omitted.

(1) Communication wake-up state The operation of the wireless information processing terminal 7 in the communication wake-up state is the same as the operation of the wireless information processing terminal 3 according to the first embodiment. The communication wake-up synchronization process is performed based on the phase reference signal output from the modulation frequency detector 22. This phase reference signal is not generated during the standby bedtime synchronization process.

(2) Standby sleeping state In the standby sleeping state, the power control unit 28 of the wireless information processing terminal 7 is in a state in which power is supplied only to the sleeping operating unit for a predetermined time t ₁ at the time t ₂ . In the meantime, the wireless module 44 is controlled so that power is supplied to all the components of the wireless module 44. At this time, the power supply control unit 28 grasps the times t ₁ and t ₂ according to the phase reference signal output from the time step extraction unit 36. Thereby, the power supply control unit 28 grasps the times t ₁ and t ₂ based on the information related to the transmission time included in the signal transmitted from the positioning satellite 60.

(I) Complete sleep state The bedtime operation unit is the power control unit 28, the synchronous clock 26, the reference station signal reception unit 34, and the time step extraction unit 36, and the bedtime operation in the first and second embodiments. In addition, a reference station signal receiving unit 34 and a time step extracting unit 36 are added.

(Ii) Synchronous wake-up state In the synchronous wake-up state, standby sleep synchronization processing is performed. The reference station signal receiver 34 in FIG. 6 receives a signal from the positioning satellite 60 via the antenna 32 and inputs it to the time step extractor 36. The time step extraction unit 36 reads information on the transmission time from the signal input from the reference station signal reception unit 34, generates a phase reference signal based on the information, and inputs the phase reference signal to the synchronization control unit 24. The synchronization control unit 24 performs synchronization processing of the synchronization clock 26 based on the phase reference signal. As a result, the synchronization clock 26 can synchronize with the clock included in the positioning satellite 60, and each of the wireless information processing terminals 7 that construct the autonomous distributed wireless network 2 performs such synchronization processing, whereby the network As a whole, the synchronization state in the standby sleeping state is established.

  As described above, in this embodiment, the standby bedtime synchronization process based on the signal transmitted from the positioning satellite 60 is performed, and the standby bedtime synchronization process based on the synchronization signal transmitted from the other wireless information processing terminal 7 is not performed. Therefore, the synchronization reference is a signal transmitted from the common positioning satellite 60 for all the wireless information processing terminals 7, so that the problem of synchronization deviation between the wireless information processing terminals 7 does not occur. In addition, it is possible to perform a standby bedtime synchronization process that is quicker and more reliable than that of the first embodiment.

4). Fourth Embodiment Next, a fourth embodiment will be described. FIG. 7 shows the configuration of the wireless information processing terminal 9 according to the fourth embodiment. Similar to the wireless information processing terminal 5, the wireless information processing terminal 9 includes a wireless module 46 and an information processing terminal 50, and is applied instead of the wireless information processing terminal 5 of the autonomous distributed wireless network 2 of FIG. In the present embodiment, not only the standby bedtime synchronization process in the synchronized wake-up state but also the communication wake-up synchronization process in the communication wake-up state is performed based on the signal transmitted from the positioning satellite 60. In the first to third embodiments described above, the communication wake-up synchronization process is performed based on the phase reference signal output from the modulation frequency detector 22, whereas in this embodiment, the signal transmitted from the positioning satellite 60 is used. The difference is that the synchronization process at the time of communication wake-up is performed based on the above. Similarly to the third embodiment, the operation in which the power supply control unit 28 grasps the times t ₁ and t ₂ in the standby sleeping state is based on the information on the transmission time included in the signal transmitted from the positioning satellite 60. Done.

  The operation of the autonomous decentralized wireless network 2 according to the fourth embodiment regarding the communication wake-up state and the standby sleep state will be described for each state. Note that detailed description of the same operations as those of the first embodiment, the second embodiment, and the third embodiment is omitted.

(1) Communication wake-up state The communication wake-up synchronization process is different from the first to third embodiments in that it is performed based on the phase reference signal output by the time step extraction unit 36. That is, the synchronization clock 26 is not synchronized with the synchronization clock 26 included in another wireless information processing apparatus in the communication wake-up state, and the synchronization processing depends solely on the satellite positioning system.

(2) Standby sleeping state In the standby sleeping state, the power control unit 28 of the wireless information processing terminal 9 is in a state in which power is supplied only to the sleeping operating unit for a predetermined time t ₁ at the time t ₂ . In the meantime, the wireless module 46 is controlled so that power is supplied to all the components of the wireless module 46. At this time, similarly to the operation of the wireless information processing terminal 7 according to the third embodiment, the power supply control unit 28 grasps the times t ₁ and t ₂ according to the phase reference signal output by the time step extraction unit 36.

(I) Complete Sleep State The bedtime operation unit is the power control unit 28, the synchronous clock 26, the reference station signal reception unit 34, and the time step extraction unit 36, which are the same as in the third embodiment.

(Ii) Synchronized wake-up state In the synchronous wake-up state, a standby bedtime synchronization process is performed. The operation at this time is the same as in the second embodiment and the third embodiment.

5. Fifth Embodiment In the second to fourth embodiments, the positioning satellite 60 is applied as the time step reference station. However, a base station device 62 provided separately from the wireless information processing terminal 5 in the service area formed by the autonomous distributed wireless network 2 can also be applied as the time step reference station. FIG. 8 shows a specific configuration of the base station apparatus 62.

  The base station device 62 includes a clock generation unit 64 that generates a signal that serves as a reference for the time interval, and a time interval transmission unit 66 that transmits the signal generated by the clock generation unit 64 from the antenna 68 as a radio signal. Since the base station device 62 does not need to move frequently within the service area, a commercial power source can be used as the power source.

  The reference station signal receiving unit 34 included in the wireless information processing terminals 5, 7, and 9 receives the signal transmitted from the base station device 62 and inputs it to the time step extracting unit 36. The time step extractor 36 extracts information related to the time step indicated by the signal input by the reference station signal receiver 34 to generate a phase reference signal. Other operations in the communication wake-up state and standby sleep state are described in 2. above. To 4. The operation is the same as that described in.

6). Sixth Embodiment Next, a sixth embodiment will be described. FIG. 8 shows the configuration of the wireless information processing terminal 11 according to the sixth embodiment. Similar to the wireless information processing terminal 5, the wireless information processing terminal 11 includes a wireless module 48 and an information processing terminal 50, and is applied instead of the wireless information processing terminal 5 of the autonomous distributed wireless network 2 in FIG.

  In the autonomous distributed wireless network 2 according to the second embodiment, standby bedtime synchronization processing is performed based on a signal received by the reference station signal reception unit 34. However, the autonomous distributed wireless network 2 is not necessarily constructed in an environment that can receive a signal from the reference unit in time increments. For example, when the autonomous distributed wireless network 2 is constructed indoors and the positioning satellite 60 is applied as the time step reference station, it is difficult for the wireless information processing apparatus 5 to receive signals transmitted from the positioning satellite 60 satisfactorily. It is.

  Therefore, in the sixth embodiment, the reception state of the signal transmitted from the time step reference station is detected, and based on the detection result, standby bedtime synchronization processing based on the signal transmitted from the time step reference station is performed, Whether to perform standby bedtime synchronization processing based on the synchronization signal transmitted by each wireless information processing terminal 11 is determined. Here, the synchronization signal means that the wireless information processing terminal 3 according to the first embodiment performs digital modulation based on the clock signal output from the synchronization clock 26 by the transmitter 14 in FIG. This is the same signal as the signal to be transmitted. For details of this synchronization signal, see 1. above. (2) Described in (ii).

  The reference station signal receiver 34 in the wireless information processing terminal 11 of FIG. 9 receives the signal transmitted from the time step reference station and inputs it to the time step extractor 36. The time step extraction unit 36 generates a phase reference signal based on the signal input from the reference station signal reception unit 34 and inputs the phase reference signal to the selection unit 72. The selection unit 72 also receives a phase reference signal based on the above-described synchronization signal from the modulation frequency detection unit 22.

  On the other hand, the reception state detection unit 70 measures the reception state of the signal based on the electric field strength of the signal transmitted from the time step reference station. This reception state is preferably defined by a numerical value. The reception state detection unit 70 controls the selection unit 72 based on the reception state. If the value indicating the reception state is equal to or greater than a predetermined value, the selection unit 72 is controlled to select the phase reference signal input by the time step extraction unit 36, and the value indicating the reception state is less than the predetermined value. If so, the selection unit 72 is controlled to select the phase reference signal based on the synchronization signal. The state in which the phase reference signal input by the time step extraction unit 36 is selected is a state in which standby bedtime synchronization processing based on the signal transmitted from the time step reference station is performed, and the phase reference signal based on the synchronization signal is selected. It can be said that the state being performed is a state in which standby bedtime synchronization processing based on the synchronization signal transmitted by each wireless information processing terminal 11 is performed.

  With this configuration, the synchronous clock 26 can synchronize with the clock provided in the time step reference station or the synchronous clock 26 provided in the other wireless information processing terminal 11, and the wireless information processing for constructing the autonomous distributed wireless network 2. When each of the terminals 11 performs such a synchronization process, the synchronization state in the standby sleep state is established for the entire network.

  As described above, in the sixth embodiment, based on the reception state of the signal transmitted from the time step reference station, the standby bedtime synchronization processing based on the signal transmitted from the time step reference station is performed, or each wireless information processing terminal 11 determines whether to perform standby bedtime synchronization processing based on the synchronization signal transmitted by the computer 11. Therefore, even when the autonomous decentralized wireless network 2 is constructed in an environment where it is impossible to receive a signal from the time base reference station, it is possible to perform reliable standby bedtime synchronization processing. In addition, by giving priority to the standby bedtime synchronization process based on the signal transmitted from the time step reference station, as compared with the case where only the standby bedtime synchronization process based on the synchronization signal transmitted by each wireless information processing terminal 11 is performed, Rapid and reliable processing can be enabled.

  The other operations in the communication wake-up state and standby sleep state are as described in 1. above. The operation is the same as that described in.

  The embodiments of the present invention have been described above. The present invention is not limited to these embodiments, and it goes without saying that various embodiments are possible within the scope of the gist of the present invention.

1 is a diagram illustrating a configuration of an autonomous distributed wireless network. It is a figure which shows the structure of the radio | wireless information processing terminal which concerns on 1st Embodiment. It is a figure which shows the operation timing of the radio | wireless information processing terminal which concerns on 1st Embodiment. It is a figure which shows the structure of the autonomous distributed radio | wireless network using a satellite positioning system. It is a figure which shows the structure of the radio | wireless information processing terminal which concerns on 2nd Embodiment. It is a figure which shows the structure of the radio | wireless information processing terminal which concerns on 3rd Embodiment. It is a figure which shows the structure of the radio | wireless information processing terminal which concerns on 4th Embodiment. It is a figure which shows the structure of the base station apparatus which concerns on 5th Embodiment. It is a figure which shows the structure of the radio | wireless information processing terminal which concerns on 6th Embodiment.

Explanation of symbols

  1, 2 Autonomous distributed wireless network, 3, 3A to 3D, 3Z, 5, 5A to 5C, 7, 9, 11 Wireless information processing terminal, 12 Information processing terminal interface, 14 Transmitter, 16, 32, 68 Antenna, 18 receiving unit, 20 relay processing unit, 22 modulation frequency detecting unit, 24 synchronization control unit, 26 synchronous clock, 28 power supply control unit, 30 identification code storage unit, 34 reference station signal receiving unit, 36 time step extraction unit, 40, 42 , 44, 46, 48 Wireless module, 50 information processing terminal, 60 positioning satellite, 62 base station device, 64 clock generation unit, 66 time increment transmission unit, 70 reception state detection unit, 72 selection unit.

Claims (14)

A wireless communication system for establishing communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device,
Each of the plurality of wireless communication devices
A synchronous clock for performing communication synchronization between wireless communication devices;
A power supply control unit that controls whether the wireless communication device is in a wake-up state or a sleep state;
With
The power control unit
In accordance with the time interval indicated by the synchronous clock, the wireless communication device is woken up at predetermined time intervals,
A wireless communication system, wherein each of a plurality of wireless communication devices synchronizes with a synchronous timepiece provided in another wireless communication device and a synchronous timepiece provided in itself while in the wake-up state. The wireless communication system according to claim 1,
Each of the plurality of wireless communication devices
A wireless communication system characterized in that, based on a time interval indicated by a signal transmitted by another wireless communication device, a synchronization timepiece provided in the other wireless communication device and a synchronization timepiece provided by itself are synchronized. The wireless communication system according to claim 1,
Each of the plurality of wireless communication devices
Select either the time step indicated by the signal transmitted by other wireless communication devices or the time step indicated by the signal transmitted from the reference station that transmits the signal serving as the reference for the time step.
A wireless communication system characterized in that, based on a selected time step, a synchronization clock provided in another wireless communication device and a synchronization clock provided by itself are synchronized. A wireless communication system for establishing communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device,
Each of the plurality of wireless communication devices
A synchronous clock for performing communication synchronization between wireless communication devices;
A power supply control unit that controls whether the wireless communication device is in a wake-up state or a sleep state;
A reference station signal receiving unit that receives a signal from a reference station that transmits a signal that is a reference for time increments;
With
The power control unit
In accordance with the time interval indicated by the synchronous clock, the wireless communication device is woken up at predetermined time intervals,
Each of the plurality of wireless communication devices synchronizes with a time step indicated by a signal received by the reference station signal receiving unit and a time step indicated by a synchronization clock provided by itself while the wireless communication device is in a wake-up state. . A wireless communication system for establishing communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device,
Each of the plurality of wireless communication devices
A synchronous clock for performing communication synchronization between wireless communication devices;
A power supply control unit that controls whether the wireless communication device is in a wake-up state or a sleep state;
A reference station signal receiving unit that receives a signal from a reference station that transmits a signal that is a reference for time increments;
With
The power control unit
In accordance with the time increment indicated by the signal received by the reference station signal receiver, the wireless communication device is set in a wake-up state at a predetermined time interval,
Each of the plurality of wireless communication devices synchronizes with a time step indicated by a signal received by the reference station signal receiving unit and a time step indicated by a synchronization clock provided by itself while the wireless communication device is in a wake-up state. . A wireless communication system for establishing communication between a plurality of wireless communication devices by operating at least one of the plurality of wireless communication devices as a wireless relay device,
Each of the plurality of wireless communication devices
A power supply control unit that controls whether the wireless communication device is in a wake-up state or a sleep state;
A reference station signal receiving unit that receives a signal from a reference station that transmits a signal that is a reference for time increments;
With
The power control unit
In accordance with the time increment indicated by the signal received by the reference station signal receiver, the wireless communication device is set in a wake-up state at a predetermined time interval,
A wireless communication system, wherein communication synchronization for performing communication between the plurality of wireless communication devices is performed at time intervals indicated by a signal received by a reference station signal receiving unit. The wireless communication system according to any one of claims 4 to 6,
The wireless communication system, wherein the reference station is a positioning satellite. A wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device;
A synchronous clock for performing communication synchronization between the first wireless communication device and the second wireless communication device;
A power control unit that controls whether the wireless repeater is in a wake-up state or a sleep state;
With
The power control unit
In accordance with the time increment indicated by the synchronous clock, the wireless repeater is woken up at predetermined time intervals,
The wireless repeater is configured to synchronize with one of the synchronous clock provided in the first wireless communication device and the synchronous clock provided in the second wireless communication device while in the wake-up state. . The wireless repeater according to claim 8, wherein
A wireless communication device that transmits a signal indicating the time step based on either the time step indicated by the signal transmitted by the first wireless communication device or the time step indicated by the signal transmitted by the second wireless communication device A wireless relay device that synchronizes a synchronization clock provided by the device and a synchronization clock provided by the device itself. A wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device;
A synchronous clock for performing communication synchronization between the first wireless communication device and the second wireless communication device;
A power control unit that controls whether the wireless repeater is in a wake-up state or a sleep state;
With
The power control unit
In accordance with the time increment indicated by the synchronous clock, the wireless repeater is woken up at predetermined time intervals,
While the wireless repeater is in the wake-up state, the reference station that transmits a time step indicated by a signal transmitted by either one of the first wireless communication device and the second wireless communication device and a signal serving as a reference for the time step A radio repeater characterized in that one of the time increments indicated by the signal transmitted from is selected, and the selected time interval is synchronized with the time interval indicated by the synchronization clock provided by itself. A wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device;
A synchronous clock for performing communication synchronization between the first wireless communication device and the second wireless communication device;
A power control unit that controls whether the wireless repeater is in a wake-up state or a sleep state;
A reference station signal receiving unit that receives a signal from a reference station that transmits a signal that is a reference for time increments;
With
The power control unit
In accordance with the time increment indicated by the synchronous clock, the wireless repeater is woken up at predetermined time intervals,
The wireless repeater is characterized in that, while in the wake-up state, the time interval indicated by the signal received by the reference station signal receiving unit and the time interval indicated by the synchronization clock provided by itself are synchronized. A wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device;
A synchronous clock for performing communication synchronization between the first wireless communication device and the second wireless communication device;
A power control unit that controls whether the wireless repeater is in a wake-up state or a sleep state;
A reference station signal receiving unit that receives a signal from a reference station that transmits a signal that is a reference for time increments;
With
The power control unit
The wireless repeater is woken up at predetermined time intervals according to the time increment indicated by the signal received by the reference station signal receiving unit,
The wireless repeater is characterized in that, while in the wake-up state, the time interval indicated by the signal received by the reference station signal receiving unit and the time interval indicated by the synchronization clock provided by itself are synchronized. A wireless repeater that receives a signal transmitted by a first wireless communication device and transmits the signal to a second wireless communication device;
A power control unit that controls whether the wireless repeater is in a wake-up state or a sleep state;
A reference station signal receiving unit that receives a signal from a reference station that transmits a signal that is a reference for time increments;
With
The power control unit
In accordance with the time increment indicated by the signal received by the reference station signal receiver, the wireless repeater is set in a wake-up state at predetermined time intervals,
A wireless repeater that performs communication synchronization for communicating with the first wireless communication device and the second wireless communication device in accordance with time increments indicated by a signal received by the reference station signal reception unit. The wireless repeater according to any one of claims 11 to 13,
The wireless repeater according to claim 1, wherein the reference station is a positioning satellite.

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