JP4861848B2 - Wireless distribution system - Google Patents

Description

  The present invention provides a specific low-power radio (for example, several mW to several tens of mW and a communication distance when receiving an early warning distribution such as an earthquake (for example, alarm information based on an emergency earthquake early warning distributed by the Japan Meteorological Agency). Broadcasts to multiple wireless relay stations installed in the vicinity of workers who work remotely, etc., using warning indications (eg warning lights) and warning alarms ( For example, the present invention relates to a wireless distribution system for outputting an alarm with an alarm sound).

  23A to 23C are schematic configuration diagrams showing conventional wireless communication systems described in Patent Documents 1 to 4 and the like described below.

JP-A-5-292577 JP-A-6-315183 JP-A-8-98227 JP-A-9-252278 JP 2006-292663 A

  In the conventional wireless communication system, as a system for transmitting and receiving data wirelessly from the master station to the slave station, the 1: 1 system shown in FIG. 23A or the 1: shown in FIGS. 23B and 23C is used. The N method is known.

  The 1: 1 system in FIG. 23A is a system in which data is transmitted and received wirelessly between the wireless master station 1 and the wireless slave station 2. The 1: N method in FIG. 23B is a method in which data is transmitted and received between the wireless master station 1 and the plurality of wireless slave stations 2-1 to 2-N using the same channel (frequency). . As described in Patent Documents 2 to 4, the method shown in FIG. 23C is within the radio wave reachable range (communication area) of the wireless master station 1, and the wireless master station 1 and the wireless master station 1 Data is transmitted and received between the wireless slave stations 2-1 to 2-N using the same channel, and is provided within the radio wave reachable range of the radio master station 1 outside the radio wave reachable range of the radio master station 1. Via the wireless relay station 3, data is transmitted and received between the wireless relay station 3 and the plurality of wireless slave stations 4-1 to 4 -N using a different channel by the 1: N method.

  In the wireless communication system described in Patent Document 1, for example, in FIG. 23B, all wireless slave stations 2-1 to 2-N are provided with a relay function, and a plurality of wireless slave stations 2-1 to 2-N are provided. Data is also transmitted and received between N, and the other wireless slave stations 2-1 to 2-N can be connected between the wireless master station 1 and a wireless slave station (for example, 2-M) outside this area. Data can be transmitted and received through the network.

  In recent years, bulletins such as earthquakes (for example, distribution of emergency earthquake bulletins by the Japan Meteorological Agency as described in Patent Document 5) has been performed.

FIG. 24 is a schematic configuration diagram showing a field such as a construction site, for example.
In a field such as a construction site, a primary temporary office 10, a secondary temporary office 11, a building under construction 12, and the like are installed, for example. In such a field, for example, by applying the specific low power radio of the radio communication method shown in FIG. It is conceivable to notify an alarm that “an earthquake will occur soon”.

  In this case, for example, in the main temporary office 1, a personal computer (hereinafter referred to as “PC”) 7 that receives the earthquake early warning 5 via the communication line 6 and an output signal of the receiving terminal PC 7. And a radio master station 1 that issues a warning signal with a specific low-power radio. When the distance between the main temporary office 10 and the building 12 under construction is long, an alarm signal from the wireless master station 1 is received in the subordinate temporary office 11 installed in the vicinity of the building 12 under construction. A wireless relay station 3 is provided for transfer. A plurality of wireless slave stations 4-1 to 4-N are installed at various locations in the building 12 under construction, and alarm signals transferred from the wireless relay station 3 by these wireless small stations 4-1 to 4-N Is received, an alarm is notified to the worker, and evacuation is promoted. Instead of the wireless relay station 3, a wireless slave station having a relay function described in Patent Document 1 may be provided.

  However, as shown in FIG. 24 of the related art, the earthquake early warning radio distribution system to which the specific low power radio is applied has the following problems (a) to (d).

(A) The wireless slave stations 4-1 to 4-N cannot be installed outside the communication area of the wireless master station 1.
(B) Even within the communication area of the wireless master station 1, there may be a case where transmission and reception cannot be performed satisfactorily due to an obstacle.
(C) When installing the wireless slave stations 4-1 to 4-N in a place outside the communication area away from the wireless master station 1, the wireless relay station 3 is interposed at a high place, but there are obstacles around The place where there is no choice has to be selected, and the arrangement place is limited.
(D) It is often difficult to transmit information to all of the wireless slave stations 4-1 to 4-N when there are obstacles. As a countermeasure, even if the relay function described in Patent Document 1 is simply added to each of the wireless slave stations 4-1 to 4 -N, a fault occurs between these wireless slave stations 4-1 to 4 -N. When there is a thing, it is difficult to transmit information to all.

  Therefore, it is difficult to construct a highly reliable wireless distribution system that is sufficiently technically satisfactory even if the techniques of the conventional patent documents 1 to 5 are simply combined.

  In the present invention, in order to construct a radio distribution system using multi-broadcast communication, when a control command (command) is received, an alarm signal and / or a relay station status acquisition signal is broadcast by specific low-power radio. A radio master station, and a plurality of upper and lower radio relay alarm stations that receive the alarm signal from the radio master station and / or the relay station status acquisition signal by a specific low-power radio and perform an alarm operation. Have.

  The plurality of radio relay alarm stations, when receiving the alarm signal from the radio master station or the upper radio relay alarm station, perform an alarm display and alarm alarm of the own station, and further, for the radio master station Alternatively, a broadcast signal which is an answer signal for the upper radio relay alarm station and also the alarm signal for the lower radio relay alarm station is transmitted. When the relay station status acquisition signal is received from the radio master station or the upper radio relay alarm station, the answer signal is for the radio master station or the upper radio relay alarm station and the lower radio A broadcast signal that is also the relay station status acquisition signal for the relay alarm station is transmitted. Further, when the answer signal is received from the lower radio relay alarm station, the received answer signal is transmitted to the radio master station or the upper radio relay alarm station.

  According to the present invention, since the radio distribution system is constructed using multi-broadcast communication, each radio relay alarm station receives an alarm signal from the radio master station or a higher radio relay alarm station. The alarm display and the alarm alarm are performed, and a broadcast signal that is an answer signal for the radio master station or the upper radio relay alarm station and also an alarm signal for the lower radio relay alarm station is transmitted. When a relay station status acquisition signal is received from a radio master station or a higher-level radio relay alarm station, it is an answer signal for the radio master station or a higher-level radio relay alarm station and relays to a lower-level radio relay alarm station A broadcast signal that is also a station status acquisition signal is transmitted. Further, when the answer signal is received from the lower radio relay alarm station, the received answer signal is transmitted to the radio master station or the upper radio relay alarm station. Thereby, even if there is an obstacle or the like, stable and highly reliable wireless distribution is possible.

  In order to construct a wireless distribution system using multi-broadcast communication, a wireless master station that broadcasts an alarm signal and a relay station status acquisition signal by a specific low-power radio when receiving a control command, and the wireless master station A plurality of upper and lower radio relay alarm stations that receive the alarm signal, the relay station status acquisition signal or other control signal from a specific low power radio to perform an alarm operation, and a radio relay dedicated station dedicated to relay have.

  The plurality of radio relay alarm stations, when receiving the alarm signal from the radio master station or the upper radio relay alarm station, perform an alarm display and alarm alarm of the own station, and further, for the radio master station Alternatively, a broadcast signal which is an answer signal for the upper radio relay alarm station and also the alarm signal for the lower radio relay alarm station is transmitted. When the relay station status acquisition signal is received from the radio master station or the upper radio relay alarm station, the answer signal is for the radio master station or the upper radio relay alarm station and the lower radio A broadcast signal that is also the relay station status acquisition signal for the relay alarm station is transmitted. Further, when the answer signal is received from the lower radio relay alarm station, the received answer signal is transmitted to the radio master station or the upper radio relay alarm station.

  When the radio relay dedicated station receives the alarm signal from the radio master station or the upper radio relay alarm station, the radio relay dedicated station is the answer signal for the radio master station or the upper radio relay alarm station. At the same time, the broadcast signal which is also the alarm signal for the lower radio relay alarm station is transmitted. When the relay station status acquisition signal is received from the radio master station or the upper radio relay alarm station, the answer signal for the radio master station or the upper radio relay alarm station and the lower The broadcast signal that is also the relay station status acquisition signal for the radio relay alarm station is transmitted. Further, when the answer signal is received from the lower radio relay alarm station, the received answer signal is transmitted to the radio master station or the upper radio relay alarm station.

(Earthquake early warning wireless distribution system configuration)
FIG. 2 is a schematic configuration diagram showing a radio distribution system for emergency earthquake alerts according to the first embodiment of the present invention.

  This emergency earthquake warning radio distribution system is installed at a construction site (for example, a building site) as shown in FIG. 24, and is analyzed by a control command (for example, an earthquake information command) analyzed by the receiving terminal PC20. This is a system that distributes an earthquake occurrence to a worker who works remotely using multi-broadcast communication by a specific low-power radio. A wireless master station 30 is connected to the receiving terminal PC 20 via a signal line 29. The receiving terminal PC 20 and the wireless master station 30 perform command transmission / reception by serial communication (for example, interface standard RS232C or RS485), and transmit a command to the wireless master station 30, so that a plurality of radios can be transmitted by a specific low power radio. Data is distributed to relay stations (for example, radio relay alarm stations 50 (50-1, 50-2,...) And radio relay dedicated stations 70 (70-1,...)).

  At this time, the radio master station 30 transmits two types of signals (for example, an alarm signal and a relay station status acquisition signal), and each radio relay alarm station 50 has three types of signals (for example, an upper answer signal). In addition, a signal that is a warning signal for the lower level, an answer signal for the higher level, a signal that is a relay station status signal for the lower level, and an answer signal that is transmitted to the higher level when received from the lower level) Further, each radio relay dedicated station 50, like each radio relay alarm station 50, has three types (for example, an answer signal for the upper level, a signal that is an alarm signal for the lower level, and a signal for the upper level). And a function of transmitting a signal that is a relay station status signal directed to a lower level and an answer signal that is transmitted to a higher level when received from the lower level.

  In this wireless distribution system, in particular, based on the reception / analysis result of the earthquake early warning, an alarm display (for example, an indicator lamp) and an alarm alarm (for example, an alarm) of each wireless relay alarm station 50 according to a command from the receiving terminal PC 20 Sound).

FIG. 3 is a schematic configuration diagram showing the receiving terminal PC 20 in FIG.
The receiving terminal PC 20 includes, for example, a control unit 21 that executes a wireless system management program 21a, a TCP (Transmission Control Protocol) server 22 having a connector with a specified port number, a serial interface 23, and an operation unit 24 that performs various settings of the wireless system. And a display unit 25 for displaying a wireless status. The receiving terminal PC 20 communicates with the real-time earthquake disaster prevention system 19 connected to the TCP server 22 by the communication protocol TCP / IP (Internet Protocol) on the Internet, receives a command from the real-time earthquake disaster prevention system 19, receives the serial interface 23 and A command is transmitted / received to / from the wireless master station 30 connected via the signal line 29 by serial communication, and wireless control is performed.

  In this wireless distribution system, the wireless master station 30 receives commands from the receiving terminal PC 20 and performs various operations in accordance with the wireless system management program 21a stored in the receiving terminal PC 20. For example, an RS232C serial interface is used for communication with the wireless master station 30, and communication with the real-time earthquake disaster prevention system 19 is performed using the communication protocol TCP / IP through the wireless system management program 21a. Further, the radio system management program 21a displays the status of each radio relay station (for example, each radio relay alarm station 50 and each radio relay dedicated station 70), sets the parameters of the radio master station 30, and the like.

FIG. 4 is a schematic circuit configuration diagram showing an example of the wireless master station 30 in FIG.
The wireless master station 30 has a function of transmitting / receiving a command by serial communication with the receiving terminal PC 20 and, when receiving a command from the receiving terminal PC 20, broadcasts an alarm signal and a relay station status acquisition signal by specific low-power radio. The terminal includes, for example, a power supply unit 31 that receives a direct current (hereinafter referred to as “DC”) 5 V, an interface converter 32 connected to the receiving terminal PC 20 through a signal line 29, and an operation switch 33. The interface converter 32 and the operation switch 33 are connected to a control unit (for example, an ultra-compact arithmetic processing unit, hereinafter referred to as “MPU”) 34 that controls the entire radio master station. A radio relay station status display unit 35 and a specific low power radio unit 36 are connected to the MPU 34, and a radio antenna 37 is connected to the specific low power radio unit 36.

  The wireless master station 30 transmits / receives data to / from wireless relay stations (for example, each wireless relay alarm station 50 and each wireless relay dedicated station 70) by a command from the receiving terminal PC20. Functions that can be controlled by the MPU 34 by commands include, for example, control of indicator lights (flashing / extinguishing) of each radio relay alarm station 50, control of alarm sound of each radio relay alarm station 50, and status of each radio relay alarm station 50 Information acquisition. Further, the radio master station 30 measures the floor noise level of each radio frequency channel in which the radio master station 30 is placed at the time of start-up or a request from the receiving terminal PC 20, and selects the radio frequency channel most suitable for use. It also has a function to decide.

  FIGS. 5A to 5C are schematic overview diagrams showing an example of the wireless master station 30 in FIG. 2, wherein FIG. 5A is a front view, FIG. 5B is a side view, and FIG. FIG. 3C is a rear view.

  The wireless master station 30 has a housing 38, and a wireless relay station status display unit 35 and a parent station control switch unit 39 constituting the operation switch 33 are provided on the front surface of the housing 38. A specific low-power radio antenna 37 for transmitting and receiving data between the radio master station 30 and the radio relay station is attached to a plane (upper surface) 38. A power switch 40, an RS232C connector 41, an RS485 connector 42, and an AC (hereinafter referred to as “AC”) adapter connector 43 that constitute the operation switch 33 are provided on the rear surface of the housing 38.

  The power switch 40 turns on the power when the wireless master station 30 is used. The RS232C connector 41 uses this connector 41 when communicating with the receiving terminal PC 20 using the RS232C. The RS485 connector 42 uses this connector 42 when communicating with the receiving terminal PC 20 using the RS485. When it is desired to use the wireless master station 30 away from the receiving terminal PC 20 (long distance transmission), RS485 is used. The AC adapter connector 43 is a connector for connecting an AC adapter.

FIG. 6 is a detailed view showing the radio relay station status display unit 35 in FIG.
The radio relay station status display unit 35 is a part for displaying the status of the radio relay station, for example, for displaying the status of each relay station (slave station) 1 to 8 It is comprised by the display parts 35-1 to 35-8. Each display unit 35-1 to 35-8 displays a connection LED 35 a that displays a connection state, a battery LED 35 b that displays a battery state, and a use state by an indicator lamp (for example, a light emitting diode, hereinafter referred to as “LED”). A use LED 35c and a use LED / use changeover switch 35d are provided.

The connection LED 35a displays a wireless communication state with the wireless relay station. The state of the connection LED 35a has three states of off, green on, and red on, and has the following meaning depending on each state.
-Off: Indicates that communication with the radio relay station is not possible. The light is also turned off when the wireless relay station is not used.
-Red light ON: Indicates a state in which communication with the radio relay station is performed but the reception level is below a certain level or the reception level is not measured.
-Lit in green: Communication with the wireless relay station is performed and the reception level is above a certain level.

The battery LED 35b indicates the state of the battery of the wireless relay station. The state of the battery LED 35b has three states of off, green on, and red on, and has the following meaning depending on each state.
-Off: Indicates that the wireless relay station is operating with an external power supply (AC100V). The light is also turned off when the wireless relay station is not used.
-Lit in green: Indicates that the wireless relay station is battery operated and the charging status is good.
・ Lights red: Indicates that the wireless relay station is operating on battery, but the battery charge is low.

  When using each radio relay station in the use LED / use switch 35d, the use switch 35d is pressed to instruct the use of the radio relay station. When in use, the use LED 35c is lit. Moreover, it can switch to a non-use state by pushing the use switch 35d again in a use state (use LED 35c is a lighting state).

FIG. 7 is a detailed view showing the master station control switch unit 39 in FIG.
The master station control switch unit 39 is used when performing wireless distribution manually, and includes a connection confirmation switch 39a, an installation mode switch 39b, a training alarm switch 39c, an alarm sound output changeover switch 39d, and an alarm. A stop switch 39e is provided.

  When the switch 39a is pressed, the connection confirmation switch 39a can confirm the status of the radio relay station by manually transmitting a status acquisition command that is normally acquired periodically. When the acquisition is completed, the display on the status display unit 35 changes.

  When installing the radio relay station, the installation mode switch 39b is pressed to enter the installation mode. When the switch 39b is pressed, the LED attached to the switch 39b is turned on to indicate the installation mode. When the installation is completed, the installation mode is canceled by pressing the switch 39b again.

  By pressing the training warning switch 39c in the training warning switch 39c and the warning sound output changeover switch 39d, a warning of each relay warning station can be output. The type of warning to be output can be switched by the warning sound output switching switch 39d, and the LED state of the training warning switch 39c changes each time the output switching switch 39d is pressed. When the LED of the training warning switch 39c is turned off, only the display by the indicator lamp is output. When the LED of the training warning switch 39c is lit, a warning sound is output simultaneously with the display by the indicator lamp. The alarm stop switch 39e presses this switch 39e when it is desired to stop the alarm of each radio relay alarm station 50.

FIG. 8 shows a schematic diagram of a specification example of the wireless master station 30 in FIG.
FIG. 9 is a schematic circuit configuration diagram showing an example of the radio relay alarm station 50 (50-1, 50-2,...) In FIG.

  Each of the upper and lower radio relay alarm stations 50 is a terminal that receives an alarm signal, a relay station status acquisition signal, or other control signal from the radio master station 30 by a specific low-power radio and performs an alarm operation. In particular, when each of these radio relay alarm stations 50 receives an alarm signal from the radio master station 30 or an upper radio relay alarm station, the radio relay alarm station 50 displays its own alarm display and alarm alarm. Alternatively, a broadcast signal that is an answer signal for the upper radio relay alarm station and also an alarm signal for the lower radio relay alarm station is transmitted, and the relay station status acquisition signal is transmitted from the radio master station 30 or the upper radio relay alarm station. , The broadcast signal that is the answer signal for the radio master station or the upper radio relay alarm station and the relay station status acquisition signal for the lower radio relay alarm station is transmitted. When the answer signal is received from the wireless relay alarm station, a function is provided for transmitting the received answer signal to the radio master station or the upper radio relay alarm station.

  Specifically, each of these radio relay alarm stations 50 receives the control data transmitted from the radio master station 30 with specific low-power radio, performs blinking control of the indicator lamp, and outputs a warning sound. For example, a power supply unit 51 that receives AC 100V, a battery charging circuit 52 connected to the power supply unit 51, and a battery charging circuit 52 that charges the data. It has a battery 53 and a radio antenna 54 for receiving specific low-power radio. A specific low power radio unit 55 is connected to the radio antenna 54, and a control unit (for example, MPU) 56 that controls the entire radio relay alarm station is connected to the specific low power radio unit 55.

  The MPU 56 is connected to an operation switch 57, a wireless link indicator lamp (for example, LED) 58, and an alarm lamp lighting circuit 59, and the alarm lamp 60 is controlled to be lit by the alarm lamp lighting circuit 59. Furthermore, an audio output unit 61 is connected to the MPU 56, and an alarm sound data storage memory 62 and a speaker driving amplifier (hereinafter referred to as “amplifier”) 63 are connected to the audio output unit 61, and this speaker driving unit. An alarm sound is output from a speaker 64 driven by an amplifier 63.

  Here, the alarm sound output from the speaker 64 can be output as an arbitrary alarm sound by changing the data in the alarm sound data storage memory 62. The wireless link LED 58 is a wireless communication state confirmation indicator lamp for confirming whether or not normal communication with the wireless master station 30 is being performed. The radio relay alarm station 50 normally operates at 100 VAC, but has a built-in battery 53 that is automatically charged by the battery charging circuit 52 when the 100 VAC is connected. Battery operation is possible. Each wireless relay alarm station 50 is configured so that a wireless relay station number that does not overlap can be set using a setting switch in the operation switch 57.

  FIGS. 10A to 10C are schematic overview diagrams showing an example of the wireless relay alarm device 50 (50-1, 50-2,...) In FIG. 2, and FIG. FIG. 4B is a side view, and FIG. 4C is a plan (top) view.

  Each wireless relay alarm station 50 has a housing 65. On the plane (upper surface) of the housing 65, a specific low-power radio antenna 54 for transmitting and receiving data between the radio master station 30 and the radio relay alarm station 50, and a relay station number setting switch 57c in the operation switch 57 are provided. And an alarm lamp 60 that turns off and blinks in response to an alarm command from the wireless master station 30 and a relay station control unit 66, which are protected by a frame-shaped guard 67 attached to the upper surface of the housing 65. Has been. Since each wireless relay station has a relay station number that does not overlap, the relay station number is set by the relay station number setting switch 57c.

  On the front of the housing 65, a speaker 64 that outputs audio data in the alarm sound data storage memory 62 built in by an alarm command from the wireless master station 30 and an external power source are used although not used in the case of battery operation. In this case, an AC connector 68 for connecting an AC 100V power source and a power switch 69 for turning on the power when the wireless relay alarm station 50 is used are attached.

FIG. 11 is a detailed view showing the relay station control unit 66 in FIG.
The relay station control unit 66 is used when the radio relay alarm station 50 is manually operated, and includes a radio link LED 58, a connection confirmation switch 57a in the operation switch 57, and an alarm stop switch 57b. Yes.

The wireless link LED 58 displays a wireless communication state with the wireless master station 30. The state of the wireless link LED 58 has, for example, three states of off, green on, and red on, and has the following meaning depending on each state.
-Off: Indicates that communication with the wireless master station 30 is not possible.
Illuminated in red: Indicates a state in which communication is performed with the wireless master station 30 but the reception level is below a certain level or the reception level is not measured.
-Lit in green: Communication with the wireless master station 30 is performed and the reception level is above a certain level.

  The connection confirmation switch 57 a is a switch for transmitting a command from the radio relay alarm station 50 side to the radio master station 30 and confirming communication with the radio master station 30. Normally, at the time of installation, the wireless master station 30 side is set to the “installation mode” and receives a command from the wireless master station 30, so it is used when the wireless master station 30 side is not in the installation mode.

  The alarm stop switch 57b is a switch for forcibly stopping an alarm output in response to an alarm output command from the wireless master station 30. Normally, a stop command is sent from the wireless master station 30 side, and the alarm output stops. However, this is used when the output does not stop for some reason.

  FIG. 12 shows a schematic diagram of a specification example of the radio relay alarm station 50 (50-1, 50-2,...) In FIG.

  FIG. 13 is a schematic circuit configuration diagram showing an example of the radio relay dedicated station 70 (70-1,...) In FIG.

  When each radio relay dedicated station 70 receives an alarm signal from the radio master station 30 or the upper radio relay alarm station 50, the radio relay dedicated station 70 is an answer signal for the radio master station or the upper radio relay alarm station as well as a lower signal. When a broadcast signal that is also an alarm signal for the radio relay alarm station is transmitted and a relay station status acquisition signal is received from the radio master station 30 or the upper radio relay alarm station 50, the radio signal for the radio master station or the upper radio When an answer signal for a relay alarm station and a relay station status acquisition signal for a subordinate radio relay alarm station is transmitted, and an answer signal is received from a subordinate radio relay alarm station 50, This is a dedicated terminal for wireless relay that does not output an alarm for transmitting the received answer signal to the wireless master station or the upper wireless relay alarm station.

  Specifically, each of the radio relay dedicated stations 70 includes, for example, a power supply unit 71 that receives AC 100V, a battery charging circuit 72 connected to the power supply unit 71, and a battery 73 that is charged by the battery charging circuit 72. And a radio antenna 74 for receiving a specific low power radio. A specific low power radio unit 75 is connected to the radio antenna 74, and a control unit (for example, MPU) 76 that controls the entire radio relay dedicated station is connected to the specific low power radio unit 75. An operation switch 77 and a radio link indicator lamp (for example, LED) 78 are connected to the MPU 76.

    14 (a) to 14 (c) are schematic overview diagrams showing an example of the radio relay dedicated station 70 (70-1,...) In FIG. 2. FIG. 14 (a) is a front view. FIG. 2B is a side view, and FIG. 2C is a plan (top) view.

  Each radio relay dedicated station 70 has a housing 79. A plane (upper surface) of the casing 79 is provided with a specific low-power radio antenna 74 for transmitting and receiving data between the radio master station 30 and the radio relay dedicated station 70, and a relay station control unit 80. . The front surface of the casing 79 is not used in the case of battery operation, but is turned on when using an AC connector 81 for connecting an AC 100 V power source and an in-wire dedicated station 70 when using an external power source. A power switch 82 is attached.

FIG. 15 is a detailed view showing the relay station control unit 80 in FIG.
The relay station control unit 80 is used when operating the radio relay dedicated station 70 manually, and has a radio link LED 78, a connection confirmation switch 77a in the operation switch 77, and a relay station number setting switch 77b. is doing.

The wireless link LED 78 displays a wireless communication state with the wireless master station 30. The state of the wireless link LED 78 has, for example, three states of off, green on, and red on, and has the following meaning depending on each state.
-Off: Indicates that communication with the wireless master station 30 is not possible.
Illuminated in red: Indicates a state in which communication is performed with the wireless master station 30 but the reception level is below a certain level or the reception level is not measured.
-Lit in green: Communication with the wireless master station 30 is performed and the reception level is above a certain level.

(Earthquake early warning wireless distribution system function)
Since this wireless distribution system is intended for use at construction sites, etc., in order to make the system suitable for the environment and conditions at the construction site, etc., the following functions that consider use in each environment and condition are as follows: have.

  Each radio master station 30, each radio relay alarm station 50, and each radio relay dedicated station 70 has a plurality of frequency channels for radio communication, and each radio master station 30, each radio relay alarm station 50, or each radio relay dedicated The station 70 has a noise confirmation function for confirming the noise level of each frequency channel in the field. At the start of wireless communication, the wireless master station 30 selects a frequency channel smaller than a predetermined noise level (for example, −127 dBm or less). Wireless communication is performed as selected.

  Each radio relay alarm station 50 and each radio relay dedicated station 70 have at least a relay station status of noise level, reception sensitivity, and battery charge state. For the purpose of appropriately arranging the slave stations in a radio wave environment where stable communication can be performed, at the time of installation, the wireless master station 30 relays each wireless relay alarm station 50 and each wireless relay dedicated station 70 by wireless communication. By checking the status, the radio relay alarm station 50 and the radio relay dedicated station 70 have a function of checking the radio wave state (for example, noise level and reception sensitivity). Further, for the purpose of confirming the quality of the live state and communication state of the slave stations arranged, during normal operation, the wireless master station 30 is dedicated to each wireless relay alarm station 50 and each wireless relay by wireless communication. The relay station status of the station 70 is automatically obtained and checked every predetermined time, and the relay station status of each radio relay alarm station 50 and each radio relay dedicated station 70 is managed.

  Specifically, this wireless distribution system has the following functions (1) to (6), for example.

(1) Wireless Multi-Broadcast Communication Function FIG. 1 is a schematic diagram of wireless multi-broadcast communication showing an emergency earthquake early warning radio distribution system according to the first embodiment of the present invention.

  This wireless distribution system uses a specific low-power radio to communicate between the wireless master station 30 and a wireless relay station (for example, the wireless relay alarm station 50 and the wireless relay dedicated station 70), and display an indicator / warning when an earthquake occurs. Display with sound. A plurality of radio relay stations (for example, the radio relay alarm station 50 and the radio relay dedicated station 70) are installed and communicate with the radio master station 30, but are separated from the radio master station 30 or with the radio master station 30. If there are obstacles 90-1, 90-2, 90-3 between them, direct communication with the wireless master station 30 may not be possible. Therefore, in this wireless distribution system, the data relayed from the wireless master station 30 is transmitted to the wireless relay stations (for example, the wireless relay dedicated stations 70-1 and 70-2) in the communication area 91-1 that the wireless reaches. While receiving data, to other wireless relay stations in the communication areas 91-2 and 91-3 of the wireless relay stations (for example, wireless relay dedicated stations 70-1 and 70-2) (for example, dedicated to wireless relay) From the station 70-1 to the radio relay alarm station 50-1, from the radio relay dedicated station 70-2 to the radio relay dedicated station 70-3, and from the radio relay dedicated station 70-3 to this communication area 91-5, 91-6. To the wireless relay alarm stations 50-2 and 50-3), and the communication is performed by “multi-broadcast communication” in which data is broadcasted in sequence at different timings. By such multi-broadcast communication, broadcast communication can be performed in a wide communication area 91-1 to 91-6, and also wirelessly relayed to places where obstacles 90-1 to 90-3 exist and radio waves are difficult to reach. By adding stations (for example, the radio relay alarm station 50 and the radio relay dedicated station 70), transmission can be easily performed, and since radio paths can be multiplexed, communication redundancy is provided. It is also possible to

In the wireless multi-broadcast communication of FIG. 1, each wireless station is received through the following relay route.
The radio relay dedicated stations 70-1 and 70-2 receive data directly from the radio master station 30.
The radio relay alarm station 50-1 receives the relay data of the radio relay dedicated station 70-1.
The radio relay dedicated station 70-3 receives the relay data of the radio relay dedicated station 70-2.
The radio relay alarm station 50-2 receives the relay data of the radio relay dedicated station 70-3.
The radio relay alarm station 50-3 receives the relay data of the radio relay dedicated station 70-2. In addition, when data from the radio relay dedicated station 70-2 cannot be received, relay data from the radio relay dedicated station 70-3 can also be received, thereby achieving duplex communication.

(2) Function during normal operation of wireless distribution system In the wireless master station 30 shown in FIG. 4, in order to confirm the status of the wireless relay station, the MPU 34 periodically checks the state of the wireless relay station via the wireless antenna 37 and the specific low power wireless unit 36. Obtain status information and monitor the status of the radio relay station. The acquired status information is, for example, as follows.
・ Reception level of wireless relay station ・ Floor noise level of wireless relay station ・ Relay route information of wireless relay station ・ Power supply state (AC power supply operation / battery operation)
・ Battery charging status

  When receiving the status information of the radio relay station, the radio master station 30 updates the display and displays the current status of the radio relay station on the radio relay station status display unit 35 in real time. At the same time, in the receiving terminal PC 20 shown in FIG. 3, it is possible to graphically display the status information of the radio relay station on the screen of the display unit 25 by the radio system management program 21a. Further, when a communication abnormality or the like occurs in the status information acquired periodically, the higher-level application can notify the abnormality of the wireless relay station by e-mail or the like.

  FIG. 16 is a diagram showing an example of a display screen on the display unit 25 of the receiving terminal PC 20 of FIG.

(3) Function at the time of earthquake warning notification As a result of receiving and analyzing the earthquake early warning in the receiving terminal PC20 of FIG. 3, when the radio relay alarm station 50 needs to output an alarm, the radio master station 30 of FIG. In response to a command from the receiving terminal PC 20, an alarm output command using an indicator lamp / alarm sound is distributed by wireless broadcast communication, and an alarm is output. When stopping the output of the alarm, an output stop command is received from the receiving terminal PC 20 and an alarm stop command is transmitted to each radio relay alarm station 50. If the alarm output of the radio relay alarm station 50 does not stop for some reason, it can be manually stopped by the alarm stop switch 57b of FIG. The warning sound can be output as an arbitrary sound by rewriting data in the memory 62 built in the wireless relay alarm station 50 of FIG.

(4) Functions when installing a radio relay station At a construction site, the location where you want to warn of an earthquake early warning will change depending on the progress of work. Therefore, the radio relay station (for example, the radio relay alarm station 50 in FIG. 10 and the radio relay dedicated station 70 in FIG. 14) has the following functions so that it can be easily installed at an arbitrary place.
When the radio relay station is installed, data is transmitted from the radio master station 30 at intervals of several seconds by setting the radio master station 30 to the “installation mode” by the installation mode switch 39b of FIG. When receiving the data, the wireless relay station turns on the wireless link LEDs 58 and 78 in FIGS. 11 and 15 to notify the reception of the data. Therefore, when the wireless relay station is taken to a place where it is desired to be installed, it can be installed while checking whether or not wireless data communication can be performed.

Furthermore, since it is possible to display the reception sensitivity at the wireless relay alarm station 50 on the display screen of the display unit 25 in the reception terminal PC20, it is possible to determine whether the radio wave condition at the installation location is good. It can be installed in a communication area where radio waves reach reliably. When it is desired to install in a place where radio waves do not reach directly from the wireless master station 30, it is possible to perform communication by the multi-broadcast communication described above by placing the wireless relay dedicated station 70 between them.
In the radio system management program 21a provided in the receiving terminal PC 20 of FIG. 3, the status information of the radio relay station can be displayed on the display unit 25 in real time, and the radio relay station can be installed from the location where the radio master station 30 is installed. It is possible to check the situation.
Even when the wireless master station 30 is not in the “installation mode”, the wireless communication can be confirmed by pressing the connection confirmation switches 57a and 77a of FIGS. 11 and 15 of the wireless relay station.
Since the number of radio relay stations used varies depending on the situation, the radio master station 30 can easily change the radio relay station to be used by the use changeover switch 35d in FIG. Thereby, it is possible to check whether the data is transmitted to all the relay stations in use by the use LED 35c and the connection LED 35a in FIG.
As shown in FIGS. 10 and 14, the radio relay station is lightweight and has a shape that is easy to carry.
・ Dustproof and waterproof in consideration of use at construction sites.
The radio relay station normally operates with AC 100V, but since the batteries 53 and 73 of FIGS. 9 and 13 are built in, the radio relay station can operate with the batteries 53 and 73 even without AC 100V. Since the state of charge of the batteries 53 and 73 is transmitted as status information, a decrease in battery voltage can be confirmed with the battery LED 35b of FIG.

(5) Data format used As the data format used in the wireless distribution system of FIG. 1, various data formats can be used.

  For example, the alarm signal, which is a broadcast signal, has a data format format having alarm output data and relay route data. The relay station status acquisition signal, which is a broadcast signal, is in a data format having alarm state data, relay station status data, and relay path data. Furthermore, the answer signal is a data format having alarm status data and relay path data corresponding to the alarm signal, or a data format having alarm status data, relay station status data and relay path data corresponding to the relay station status acquisition signal. Format. Thus, by changing the contents of the data format of the alarm signal, the relay station status acquisition signal, and the answer signal, highly reliable wireless communication that avoids interference and the like becomes possible.

  However, in the first embodiment, the present invention is not limited to these data format formats. For example, it is possible to simplify communication devices using a simple data format format as shown in FIG.

  FIGS. 17A and 17B are configuration diagrams showing an example of a simplified data format used in the wireless distribution system of FIG.

  The data format 100 shown in FIG. 17A used in wireless communication is, for example, 18 bytes consisting of 4-byte header data 101, 4-byte relay status data 102, and 10-byte relay path data 103. It is data of. The 4-byte header data 101 includes a 1-byte transmission data type, a 1-byte sequence number, a 1-byte relay station use flag, and a 1-byte relay station reception level flag. The 4-byte relay station status data 102 includes a 1-byte relay station number, a 1-byte relay station type, a 1-byte battery voltage, and a 1-byte AC power use flag. The 10-byte relay route data 103 includes a 1-byte relay route counter, a 1-byte maximum number of relays, and 8-byte relay route information.

  The data format 100A shown in FIG. 17B includes, for example, 3 bytes of header data 101, 5 bytes of relay station status data 102, 1 byte of alarm information data or alarm output data 102a, and 10 bytes of data. This is 24-byte data composed of the relay route data 103 and 5-byte spare data 104. The 3-byte header data 101 includes a 1-byte transmission data type, a 1-byte sequence number, and a 1-byte relay station use flag. The 5-byte relay station status data 102 includes a 1-byte relay station reception level flag, a 1-byte relay station number, a 1-byte relay station type, a 1-byte battery voltage, and a 1-byte AC power usage flag. ing. The 10-byte relay route data 103 includes a 1-byte relay route counter, a 1-byte maximum number of relays, and 8-byte relay route information.

(6) Setting function of radio frequency channel to be used If the channel used by radio is the same channel as other transceivers and other radios, transmission cannot be performed at the same time due to the limitations of specific low-power radio, resulting in communication failure. turn into. Therefore, in this wireless distribution system, for example, a channel to be used is determined by the following function.

  The 40 channels that can be used wirelessly are divided into four groups: 1-10, 11-20, 21-30, 31-40. The group of the channel of the channel used by the channel of other radios, such as a transceiver used at a construction site etc., and this radio distribution system is instructed to use the above-mentioned four groups.

  The radio master station 30 measures the floor noise level of the 10-channel field in the group to be used in order to determine the optimum radio frequency channel to be used at the location where the radio master station 30 is installed, and the most floor noise level is measured. Use a lower frequency channel. The frequency channel determined here becomes a frequency channel used in the entire system.

(How to determine the frequency channel used)
The frequency channel used in this wireless distribution system is determined by the following methods (A) and (B), for example.

(A) Channel Search Sequence in Radio Master Station 30 FIG. 18 is a flow showing a channel search sequence for determining a channel in the radio master station 30 in FIG.

  The wireless master station 30 in FIG. 4 performs a channel search according to the following flow in FIG. 18 at the time of activation and at the time of a request from the receiving terminal PC 20.

  The MPU 34 of the radio master station 30 starts a channel search according to the radio system management program 21a in the receiving terminal PC 20 (step S1), determines a channel group to be used (step S2), and sets it to the first channel in the group. Then, the floor noise level of each radio frequency channel at the place where the radio master station 30 is installed is measured (step S4).

  The measurement result is compared with the measured level (step S5), and it is determined whether or not the noise level is large (step S6). When the noise level is smaller than the measured level, it is compared with the measured level (step S7) and used. Set as a channel (step S8) and set to the next channel (step S9). If it is greater than the measured level in step S6, the process proceeds to step S9.

  It is determined whether or not all channels have been searched (step S10). If all channels have not been searched, the process returns to step S4. If all channels have been searched, the channel search is terminated (step S11). Thereby, the optimum radio frequency channel to be used is determined.

(B) Channel search sequence of radio relay station (for example, radio relay alarm station 50 in FIG. 9 and radio relay dedicated station 70 in FIG. 13) Radio relay station (for example, radio relay alarm station 50 in FIG. 9 and radio in FIG. 13) The relay dedicated station 70) performs wireless communication using the channel determined by the wireless master station 30. However, the radio relay station performs channel search at the time of start-up and when a fixed status request is not received even after a fixed time has elapsed after receiving a fixed status request command.

  FIG. 19 is a flowchart showing a channel search sequence for determining a channel at a radio relay station (for example, the radio relay alarm station 50 in FIG. 9 and the radio relay dedicated station 70 in FIG. 13).

  The MPU 56 of the radio relay alarm station 50 in FIG. 9 and the MPU 76 of the radio relay dedicated station 70 in FIG. 13 start channel search (step S20), wait for reception of data (step S21), and whether or not the data has been received. Is determined (step S22). If no data is received, it is determined whether or not a certain time has elapsed (step S23). If not, the process returns to step S21. If the certain time has elapsed, the next channel is set (step S21). S24), the process returns to step S21.

  When data is received in step S22, it is set as a channel to be used (step S25), and the channel search is terminated (step S26).

(Transmission / reception sequence of each radio station)
FIG. 20 is a flowchart showing a transmission / reception sequence of each radio station (for example, the radio master station 30 in FIG. 4, the radio relay alarm station 50 in FIG. 9, and the radio relay dedicated station 70 in FIG. 13).

  The MPU 34 of the radio master station 30 in FIG. 4, the MPU 56 of the radio relay alarm station 50 in FIG. 9, or the MPU 76 of the radio relay dedicated station 70 in FIG.

  Waiting for reception (step S30), when data is received (step S31), it is determined whether or not the data has been received (step S32). Whether the data has been received is determined by checking the sequence number.

  If not received, the status information of the own station is set (step S33), the relay route information is set (step S34), the retry counter is set (step S35), and the transmission waiting time is set (step S36). ). In order to prevent carrier sense failure due to simultaneous transmission of data, a transmission waiting time is provided to change the transmission timing. The transmission waiting time is determined from the station number of each relay station. It is determined whether or not the transmission waiting time has elapsed (step S37), and when it has elapsed, carrier sense is performed (step S38), and it is determined whether or not transmission is possible (step S39). If transmission is possible, the data is broadcast (step S40).

  If it has been received in step S32, it is determined whether or not the data relayed by the own station is possible (step S41). The data that has been received and relayed by the own station is the return information for the data transmitted by the own station. When the data is relayed by the own station, the relay route information is set (step S42), and the process proceeds to step S35. In step S41, if the data is not relayed by the own station, the data is discarded (step S43).

  In step S39, when transmission is impossible, the retry counter is decremented (subtracted) (step S44), and it is determined whether or not the counter is zero (step S45). When the counter is zero or more, the process returns to step S36, and when the counter is zero. Becomes a retry-out and discards the data (step D43).

FIG. 21 is a diagram illustrating an arrangement example of the wireless distribution system of FIG.
One master station 30 and a plurality of radio relay stations 111 to 115 are arranged. Each of the radio relay stations 111 to 115 is configured by a radio relay alarm station 50 or a radio relay dedicated station 70. A broken line in FIG. 21 indicates a wireless reachable range (communication area) of each wireless station.

  FIG. 22 is a diagram illustrating an example of the communication sequence of FIG.

  The wireless master station 30 and the wireless relay stations 111 to 114 execute a communication sequence by the following procedures (1) to (17), for example.

  (1) The radio relay stations 111 and 112 receive data directly from the radio master station 30 (steps 1 and 2).

  (2) Each of the radio relay stations 111 to 114 changes the transmission timing in order to avoid a communication error (carrier sense failure) due to simultaneous transmission of data. Therefore, the wireless relay station 111 with the earlier transmission timing transmits its own status data first. The data transmitted from the radio relay station 111 is received by the radio master station 30 and the radio relay station 112. Since the radio relay station 112 has already received the data (step 2), this data is ignored. The data from the radio relay station 111 received by the radio master station 30 becomes the status information of the radio relay station 111 (step 3).

  (3) The radio relay station 112 performs broadcast transmission of data after the transmission waiting time has elapsed (step 4). This data is received by the wireless master station 30 and the relay stations 111, 113, and 115. The data received by the wireless master station 30 becomes status information of the wireless relay station 112 (step 5). The data received by the wireless relay station 111 is discarded because it has already been received. The wireless relay stations 113 and 115 are processed as valid relay data because they have not been received.

  (4) The radio relay stations 113 and 115 wait for a certain period of time (step 6), and the radio relay station 113 with an earlier transmission timing starts transmission (step 7).

  (5) The data transmitted from the radio relay station 113 is received by the radio relay stations 112, 114, and 115.

  (6) The data is discarded at radio relay station 115 because it has already been received (step 8).

  (7) The radio relay station 114 is processed as valid relay data since it has not been received (step 9).

  (8) Although the radio relay station 112 has already been received, since the data is relayed by the own station, the radio relay station 112 waits for transmission in order to transmit data (step 10). This is because the status information of the radio relay station 113 is transmitted to the radio master station 30. Therefore, as the data to be transmitted, not the status information of the own station but the status information of the radio relay station 113 is transmitted as it is.

  (9) The wireless relay station 112 with early transmission timing transmits data (step 11). This data is received by the wireless master station 30 and the relay stations 111, 113, and 115. However, since the wireless relay stations 111, 113, and 115 have already received the data, the data is discarded. The data received by the wireless master station 30 becomes status information of the wireless relay station 113 (step 12).

  (10) In step 13, the radio relay station 115 attempts carrier sense, but since the radio relay station 112 is transmitting, the carrier sense fails and waits for transmission again.

  (11) The radio relay station 114 with early transmission timing transmits data (step 14). Since this data is received by the wireless relay station 113 and is transmitted by the wireless relay station 113, the wireless relay station 113 waits for transmission in order to transmit the status information of the wireless relay station 114 to the wireless master station 30 (step 15). ).

  (12) The radio relay station 115 finishes the transmission waiting time and transmits data (step 16). The transmitted data is received by the wireless relay stations 112 and 113, and the wireless relay station 112 is data transmitted by itself, so that the wireless relay station 115 waits for transmission in order to transmit the status information of the wireless relay station 115 to the wireless master station 30. (Step 17). Note that the radio relay station 113 discards the data received from the radio relay station 115.

  (13) In step 18, the radio relay station 113 attempts carrier sense, but since the radio relay station 115 is transmitting, the carrier sense fails and again waits for transmission.

  (14) The wireless relay station 112 with early transmission timing transmits data (step 19). The transmitted data is received by the wireless master station 30 and the relay stations 111, 113, and 115. However, the wireless relay stations 111, 113, and 115 are not already received and relayed by the own station. Is discarded. The data received by the wireless master station 30 becomes status information of the wireless relay station 115 (step 20).

  (15) The wireless relay station 113 transmits data (step 21). The transmitted data is received by the radio relay stations 112, 114, and 115, but the radio relay stations 114 and 115 discard the data because they are not already received and relayed by the local station. Since the wireless relay station 112 is data transmitted by itself, the wireless relay station 112 waits for transmission in order to transmit the status information of the wireless relay station 114 to the wireless master station 30 (step 22).

  (16) After the transmission waiting time elapses, the radio relay station 112 transmits data (step 23).

  (17) The transmitted data is received by the wireless master station 30 and the wireless relay stations 111, 113, and 115, but the wireless relay stations 111, 113, and 115 are not already received and relayed by the own station. So discard this data. The data received by the wireless master station 30 becomes status information of the wireless relay station 114 (step 24).

(Effect of Example 1)
According to the first embodiment, the wireless master station 30 and the wireless relay stations 111 to 114 communicate with each other using the specific low-power radio, and display by an indicator lamp / alarm sound when an earthquake occurs. At this time, the data relayed from the wireless master station 30 is received by each wireless relay station 111-114, and to other wireless relay stations within the communication area of each wireless relay station 111-114, Communication is performed by multi-broadcast communication that broadcasts data. With this multi-broadcast communication, broadcast communication can be performed in a wide communication area, and can be easily transmitted by adding a wireless relay station to places where there are obstacles where radio waves are difficult to reach. Therefore, communication redundancy can be provided.

  Therefore, if this wireless distribution system is used, a wide range of wireless relay stations 111 to 114 can be used in a place where radio waves are difficult to reach (such as underground work, behind a reinforcing bar) in a construction site. Broadcast communication can be performed. For this reason, at construction sites and the like, there is a high possibility that a shake at the time of an earthquake will lead to an accident, so this wireless distribution system can be used to inform the operator of the occurrence of an earthquake over a wide area and help prevent accidents.

(Modification)
The present invention is not limited to the above-described embodiments, and various usage forms and modifications are possible. For example, the following forms (a) and (b) are used as the usage form and the modified examples.
(A) Although the earthquake early warning radio distribution system has been described, it can also be applied to other alarm information radio distribution other than the emergency earthquake early warning.
(B) The receiving terminal PC 20, the wireless master station 30, the wireless relay alarm station 50, and the wireless relay dedicated station 70 may be changed to a circuit configuration other than illustrated, or a communication sequence using these may be other than illustrated. It is also possible to change to another communication procedure.

It is a schematic diagram of the radio | wireless multi broadcast communication which shows the radio | wireless delivery system of the earthquake early warning in Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the radio | wireless delivery system of the earthquake early warning in Example 1 of this invention. It is a schematic block diagram which shows the receiving terminal PC20 in FIG. FIG. 3 is a schematic circuit configuration diagram showing an example of a wireless master station 30 in FIG. 2. FIG. 3 is a schematic overview showing an example of a wireless master station 30 in FIG. 2. FIG. 6 is a detailed view showing a radio relay station status display unit 35 in FIG. 5. FIG. 6 is a detailed view showing a master station control switch unit 39 in FIG. 5. It is a figure which shows the outline of the example of a specification of the radio | wireless master station 30 in FIG. FIG. 3 is a schematic circuit configuration diagram showing an example of a radio relay alarm station 50 in FIG. 2. FIG. 3 is a schematic overview showing an example of a wireless relay alarm device 50 in FIG. 2. FIG. 11 is a detailed diagram illustrating a relay station control unit 66 in FIG. 10. It is a figure which shows the outline of the example of a specification of the radio relay alarm station 50 in FIG. FIG. 3 is a schematic circuit configuration diagram showing an example of a radio relay dedicated station 70 in FIG. 2. FIG. 3 is a schematic overview showing an example of a radio relay dedicated station 70 in FIG. 2. FIG. 15 is a detailed diagram showing a relay station control unit 80 in FIG. 14. It is a figure which shows the example of the display screen in the display part 25 of receiving terminal PC20 of FIG. It is a block diagram which shows the example of the simple data format format used with the radio | wireless delivery system of FIG. FIG. 5 is a flow showing a channel search sequence for determining a channel in the wireless master station 30 of FIG. 4. FIG. 14 is a flowchart showing a channel search sequence for determining a channel at a radio relay station (for example, the radio relay alarm station 50 in FIG. 9 and the radio relay dedicated station 70 in FIG. 13). 14 is a flow showing a transmission / reception sequence of each radio station (for example, the radio master station 30 in FIG. 4, the radio relay alarm station 50 in FIG. 9, and the radio relay dedicated station 70 in FIG. 13). It is a figure which shows the example of arrangement | positioning of the wireless delivery system of FIG. It is a figure which shows the example of the communication sequence of FIG. It is a typical block diagram which shows the conventional radio | wireless communication system. It is a typical block diagram which shows fields, such as a construction site.

Explanation of symbols

19 Real-time earthquake disaster prevention system 20 Receiving terminal PC
21a Radio system management program 30 Radio master station 34, 56, 76 MPU
36, 55, 75 Specified low-power radio unit 37, 54, 74 Radio antenna 50, 50-1 to 50-8 Radio relay alarm station 70, 70-1 to 70-7 Radio relay dedicated station 100, 100A Data format 111 to 114 wireless relay station

Claims (7)

Upon receiving the control command, a radio master station that broadcasts an alarm signal and / or relay station status acquisition signal with a specific low-power radio,
A plurality of upper and lower radio relay alarm stations that perform the alarm operation by receiving the alarm signal from the radio master station and / or the relay station status acquisition signal by a specific low power radio,
The plurality of wireless relay warning stations are:
When the warning signal is received from the radio master station or the higher-level radio relay alarm station, it displays its own alarm display and alarm alarm, and further for the radio master station or the upper radio relay alarm station A broadcast signal that is also an alarm signal for the subordinate radio relay alarm station and an alarm signal for the lower radio relay alarm station,
When the relay station status acquisition signal is received from the radio master station or the upper radio relay alarm station, the answer signal is for the radio master station or the upper radio relay alarm station and the lower radio Send a broadcast signal that is also the relay station status acquisition signal for relay alarm stations,
When the answer signal is received from the lower radio relay alarm station, the received answer signal is transmitted to the radio master station or the upper radio relay alarm station. . The wireless distribution system according to claim 1, further comprising:
When the alarm signal is received from the radio master station or the upper radio relay alarm station, the answer signal for the radio master station or the upper radio relay alarm station and the lower radio relay alarm Send the broadcast signal that is also the alarm signal for the station,
When the relay station status acquisition signal is received from the radio master station or the upper radio relay alarm station, the answer signal for the radio master station or the upper radio relay alarm station and the lower Sending the broadcast signal that is also the relay station status acquisition signal for wireless relay alarm station,
When the answer signal is received from the lower radio relay alarm station, a radio relay dedicated station dedicated to relaying the received answer signal is sent to the radio master station or the upper radio relay alarm station. A wireless distribution system comprising: The warning signal which is a broadcast signal is in a data format having alarm output data and relay route data,
The relay station status acquisition signal that is a broadcast signal is in a data format having alarm state data, relay station status data, and relay route data,
The answer signal is a data format having alarm status data and relay path data corresponding to the alarm signal, or data having alarm status data, relay station status data and relay path data corresponding to the relay station status acquisition signal. 3. The wireless distribution system according to claim 1, wherein the wireless distribution system is in a format format. The radio master station, the radio relay alarm station, and the radio relay dedicated station have a plurality of frequency channels for radio communication, and the radio master station, the radio relay alarm station, or the radio relay dedicated station is a field A noise confirmation function for confirming the noise level of each frequency channel in
4. The wireless distribution system according to claim 2, wherein when the wireless communication is started, the wireless master station performs the wireless communication such that a frequency channel smaller than a predetermined noise level is selected. The radio relay alarm station and the radio relay dedicated station each have at least a relay station status of noise level, reception sensitivity, and battery charge state,
At the time of installation, the radio master station confirms the radio station status of the radio relay alarm station and the radio relay dedicated station by checking the relay station status of the radio relay alarm station and the radio relay dedicated station by radio communication. Has a function to confirm,
During normal operation, the wireless master station automatically obtains and confirms the relay station status of the wireless relay alarm station and the dedicated radio relay station every predetermined time by wireless communication, and performs the wireless relay alarm. The wireless distribution system according to any one of claims 2 to 4, wherein the relay station status of each of the station and the dedicated radio relay station is managed.   The radio master station, the radio relay alarm station, or the radio relay dedicated station is driven by a commercial power source, and is further driven by the battery by charging the installed battery with the commercial power source. The wireless distribution system according to any one of claims 2 to 5, characterized in that:   The wireless distribution system according to any one of claims 1 to 6, wherein the alarm information is alarm information based on an earthquake early warning.

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