JP2015023437A - Radio disaster prevention system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio disaster prevention system, capable of prompting recovery from a communication failure to reduce a time to the completion of normal transmission.SOLUTION: A radio detector 16-11, when transmitting a radio signal including sensor data to a radio wave repeater 14-1 or a radio reception repeater 12-1, normally completes the transmission when receiving an acknowledgement to the radio signal after the transmission of the radio signal during a predetermined transmission allocation time from the start of the radio signal transmission to required transmission suspension. When the acknowledgement to the radio signal is not received, the radio detector 16-11 transmits the radio signal in repetition by successively increasing the number of consecutive transmission times until the acknowledgement of the radio signal is received within the residual time of the transmission allocation time.

Description

The present invention relates to a wireless disaster prevention system that transmits a message wirelessly transmitted from a child node such as a wireless sensor to another node.

  Conventionally, in a wireless disaster prevention monitoring system that monitors fires, when multiple wireless sensors as sensor nodes are installed in a warning area such as each floor of a building and a fire is detected by the wireless sensor, A telegram signal indicating fire (hereinafter simply referred to as “telegram”) is wirelessly transmitted to a radio reception repeater as a radio disaster prevention node installed on a floor basis. In addition, a radio wave repeater that is a wireless relay node is installed on the way to relay messages from the wireless sensor.

  The radio reception repeater is connected to the sensor line from the receiver. When a message indicating a fire is received, an alarm current is sent to the sensor line when a relay contact or switching element is turned on to generate a fire alarm signal. Send to receiver. Upon receiving this fire alarm signal, the receiver issues a fire alarm by means such as sound.

  According to such a wireless disaster prevention system, a part of a sensor line generally laid on the ceiling or the like can be eliminated, wiring work is simplified, and the installation location of the sensor is also restricted by wiring. You can decide without. In addition, it can easily cope with system changes such as the addition of sensors.

  The wireless detector, radio wave repeater and wireless reception repeater constituting the wireless disaster prevention system are STD-30 (wireless equipment of a low power security system wireless station known as a standard of a specific low power wireless station in the 426 MHz band) Radio signals are transmitted and received based on (standard).

  STD-30 has an antenna power of 10 mW or less, and when using a radio wave with a frequency of 426.250 MHz or higher and 426.8375 MHz or lower, carrier sense is not obligatory, so by using a radio wave of this frequency, Wireless transmission is performed without performing carrier sense. In addition, carrier sense detects the reception level of radio waves of the same carrier frequency transmitted by other stations when performing wireless transmission, and when this reception level is equal to or higher than a predetermined threshold, wireless transmission is not performed. When the reception level is less than a predetermined threshold, wireless transmission is performed to avoid collision of radio waves having the same carrier frequency.

In STD-30, since carrier sense is not obligated, the emission of the radio wave is stopped within 3 seconds after the radio wave is emitted, and the subsequent emission is not made after 2 seconds have elapsed. Is not required. Hereinafter, a time within 3 seconds during which radio waves can be emitted is referred to as a transmission allocation time, and a time of 2 seconds during which radio waves are stopped is referred to as a transmission suspension time. For this reason, STD-30 can be said to be a communication method that requires a predetermined transmission suspension time following a predetermined transmission allocation time.

JP-A-5-274580 JP 2001-290209 A JP 2011-071598 A

  By the way, in such a wireless disaster prevention monitoring system, when a fire is detected by a wireless sensor, a telegram signal including data indicating the fire is generated, and this telegram is transmitted once within the transmission allotted time. If the ACK signal (hereinafter referred to as "ACK") known as the acknowledgment signal is received from the wireless reception repeater or radio wave repeater on the receiving side, it can be transmitted normally. The transmission operation is terminated.

  On the other hand, if the wireless sensor does not receive the ACK from the wireless reception repeater or radio repeater on the receiving side even if a message containing data indicating a fire is transmitted multiple times in succession After the transmission suspension time of 2 seconds elapses, a retry operation is performed in which a message containing data indicating a fire is continuously transmitted again and again, and if ACK is not received, transmission is suspended until the predetermined number of retries is reached. Repeat the same transmission operation after a while.

  For this reason, it takes time for the recovery by the retry operation when the message transmission fails, and there is a case where the time delay from the detection of the fire by the wireless sensor to the output of the fire alarm by the receiver may become large.

  In addition, communication failure that causes failure in sending messages in the wireless disaster prevention system may be due to temporary noise from equipment installed in the surveillance area, or due to temporary causes such as changes in the radio wave environment due to movement of people or objects. However, it is assumed that the communication failure has been recovered at the timing of the transmission suspension time when ACK cannot be received during message transmission. However, it takes time to communicate normally because the transmission suspension time is required. There is a problem that takes.

The present invention makes it possible to quickly recover from a communication failure and shorten the time until transmission ends normally for a communication method that requires a predetermined transmission suspension time following a predetermined transmission allocation time. The purpose is to provide a wireless disaster prevention system.

(Wireless disaster prevention system 1)
The present invention relates to a wireless disaster prevention system that transmits and receives a radio signal including disaster prevention data between a child node and a parent node based on a communication method that requires a predetermined transmission suspension time following a predetermined transmission allocation time. ,
When transmitting a radio signal to the parent node, the child node transmits a radio signal for a predetermined transmission allocation time from the start of transmission of the radio signal to when transmission suspension is required, and then transmits a radio signal of an acknowledgment from the parent node. Is received normally, and if no acknowledgment radio signal is received, the number of consecutive radio signal transmissions is counted until the acknowledgment radio signal is received for the remaining time of the transmission allocation time. It is characterized by being repeatedly transmitted while changing sequentially.

(Wireless disaster prevention system 2)
The present invention also includes a sensor node and a wireless disaster prevention node for detecting an abnormality in a monitoring area, and a sensor node and a wireless disaster prevention node based on a communication method that requires a predetermined transmission suspension time following a predetermined transmission allocation time. In a wireless disaster prevention system that sends and receives radio signals to and from
When transmitting a radio signal to the radio disaster prevention node, the sensor node transmits a radio signal for a predetermined transmission allocation time from the start of transmission of the radio signal to when transmission stop is required, and then receives a confirmation response from the radio disaster prevention node. If a radio signal is received, transmission ends normally. If an acknowledgment radio signal is not received, continuous transmission of the radio signal is performed until an acknowledgment radio signal is received during the remaining time of the transmission allocation time. Repeatedly transmit while changing the number of times sequentially.

(Wireless disaster prevention system 3)
In addition, the present invention includes a sensor node, a radio relay node, and a radio disaster prevention node, and based on a communication method that requires a predetermined transmission suspension time following a predetermined transmission allocation time, between the sensor node and the radio relay node. In the radio disaster prevention system for transmitting and receiving radio signals between the radio relay node and the radio disaster prevention node, and between the sensor node and the radio disaster prevention node,
When a sensor node and a radio relay node transmit a radio signal to a radio relay node or a radio disaster prevention node as a transmission destination, the sensor node and the radio relay node are wireless during a predetermined transmission allocation time from the start of transmission of the radio signal to the necessity of transmission suspension. If the wireless signal of the confirmation response is received from the radio relay node or the wireless disaster prevention node after transmitting the signal, the transmission ends normally, and if the wireless signal of the confirmation response is not received, during the remaining time of the transmission allocation time, Until the confirmation response wireless signal is received, the wireless signal is repeatedly transmitted while sequentially changing the number of times the wireless signal is continuously transmitted.

(Increase in the number of disaster prevention data for wireless disaster prevention systems 1, 2 and 3)
If no acknowledgment response radio signal is received, the child node, sensor node, or radio relay node sequentially increments the number of consecutive radio signal transmissions by a power of 2 or a predetermined number until the acknowledgment response radio signal is received. Send repeatedly while increasing.

  If the child node does not receive the confirmation response even when the wireless signal is repeatedly transmitted over the predetermined transmission allocation time, the child node outputs a transmission error.

The child node transmits information indicating that the wireless signal is repeatedly transmitted to the parent node by placing information on the wireless signal.

According to the wireless disaster prevention system of the present invention, for example, when a child node is a sensor node and a parent node is a disaster prevention wireless node, a sensor node that functions as a child node transmits a wireless signal to the wireless disaster prevention node that functions as a parent node. If a radio signal is not received from the radio disaster prevention node after transmitting the radio signal for a predetermined transmission allocation time from the start of transmission of the radio signal to the time when transmission suspension is required, the radio of the confirmation response is received. Until the signal is received, the wireless signal is transmitted repeatedly while the number of continuous transmissions of the radio signal is sequentially increased for the remaining time of the transmission allocation time. Wireless signal transmission can be repeated while increasing the number of continuous transmissions until the communication failure that occurred temporarily is recovered. To allow the transmission of radio signals was quickly makes it possible to shorten the time until the termination normally transmitted as recoverable to the communication failure.

Explanatory drawing which showed embodiment of the wireless disaster prevention system by this invention Block diagram showing an outline of the functional configuration of the wireless sensor Block diagram showing outline of functional configuration of radio repeater The block diagram which showed the outline of the functional structure of the repeater for radio | wireless reception, and a P-type receiver Explanatory drawing showing the message format used in the wireless disaster prevention system Time chart showing the transmission operation to increase the number of continuous transmissions by a power of 2 Time chart showing transmission operation to increase the number of continuous transmissions by a predetermined number

[Wireless disaster prevention system]
(Overview of wireless disaster prevention system)
FIG. 1 is an explanatory view showing an embodiment of a wireless disaster prevention system according to the present invention. As shown in FIG. 1, wireless reception repeaters 12-1 to 12-3 functioning as wireless disaster prevention nodes are installed on each floor of a building 11 to be monitored, from a P-type receiver 10 that is a fire receiver. It is connected to sensor lines 18-1 to 18-3 drawn out by floor.

  Wireless sensors 16-11 to 16-14, 16-21 to 16-24, and 16-31 to 16-34 functioning as sensor nodes are installed on the floors 1F to 3F. In the present embodiment, the radio reception repeaters 12-1 to 12-3 function as radio wave relay nodes in order to prevent signal loss due to radio wave attenuation from radio sensors that are far away from each other. Radio wave repeaters 14-1 to 14-3 are installed.

  In the case where the wireless sensors 16-11 to 16-34, the radio wave repeaters 14-1 to 14-3, and the radio reception repeaters 12-1 to 12-3 are not distinguished, the wireless sensor 16 and the radio wave These are called the repeater 14 and the radio reception repeater 12.

  Here, regarding the parent-child relationship, the wireless sensor 16 and the wireless reception repeater 12 are in a parent-child relationship, the wireless sensor 16 is a child node, and the wireless reception relay 12 is a parent node. The wireless sensor 16 and the radio wave repeater 14 are also in a parent-child relationship, the wireless sensor 16 is a child node, and the radio wave repeater 14 is a parent node. The radio wave repeater 14 and the radio reception repeater 12 are also in a parent-child relationship, the radio wave repeater 14 is a child node, and the radio reception repeater 12 is a parent node.

  The wireless sensor 16, the radio wave repeater 14, and the wireless reception repeater 12 have an antenna power of 10 mW or less and a frequency of 426.250 MHz or more in accordance with STD-30, which is a standard for a specific low power wireless station for security. By using a radio wave having a frequency of 426.8375 MHz or less, wireless transmission is performed without performing carrier sense.

  In STD-30, since carrier sense is not obligated, the emission of the radio wave is stopped within 3 seconds after the radio wave is emitted, and the subsequent emission is not made after 2 seconds have elapsed. This is a communication system that requires a predetermined transmission allocation time, for example, T2 = 2 seconds, followed by a predetermined transmission suspension time T2 = 2 seconds.

  Furthermore, with the recent revision, STD-30 can be retransmitted without stopping transmission for more than 2 seconds after stopping the emission for 3 consecutive seconds after emitting radio waves. To do. For this reason, if the transmission allocation time T1 is within 3 seconds, the transmission and stop of radio waves can be repeated as necessary.

  In each of the wireless sensor 16 and the radio wave repeater 14, a unique node ID using a device ID is registered in advance.

  Since the wireless reception repeater 12, the radio wave repeater 14, and the wireless sensor 16 are constructed with a wireless network by floor, different network addresses (hereinafter simply referred to as “addresses”) are set for each floor. doing.

  In each of the radio wave repeater 14-1 and the radio reception repeater 12-1, a node ID for specifying a transmission source as a child node that receives a message based on the parent-child relationship is registered in advance. That is, node IDs of the wireless sensors 16-13 and 16-14 and the radio relay 14-1 that are child nodes are registered in advance in the wireless reception repeater 12-1. Also, node IDs of the wireless sensors 16-11 and 16-12 that are child nodes are registered in advance in the radio wave repeater 14-1.

  In the radio reception repeater 12-1, in the situation where various radio signals are received from the radio sensors 16-11 and 16-12 via the radio repeater 14-1, the radio repeater 14- Even when a message transmitted from the wireless sensors 16-11 and 16-12 is directly received without going through 1, the wireless reception repeater 12- The node IDs of the wireless sensors 16-11 and 16-12 installed on the same floor (group) are also registered in one storage unit.

  The registration of the node ID of each device in the storage unit of the wireless reception repeater 12 may register the ID of each child node by communicating the wireless reception repeater 12 and other child nodes with each other. The node ID of the wireless sensor 16 previously registered in the radio repeater 14 is additionally registered in the storage unit of the radio reception repeater 12 by wireless transfer from the radio repeater 14 to the radio reception repeater 12. It may be configured.

  The same applies to 2F and 3F radio reception repeaters 12-2 and 12-3 and radio wave repeaters 14-2 and 14-3.

  The wireless sensor 16 determines a fire when the smoke concentration or temperature due to fire exceeds a predetermined threshold, and wirelessly transmits a fire message. For example, taking a case where a fire is detected by the wireless sensor 16-11 as an example, the wireless sensor 16-11 generates a predetermined form of a message including fire data “hereinafter referred to as“ fire message ””, and this fire is detected. The electronic message is transmitted to the radio repeater 14-1 continuously for a predetermined number of times, for example, twice, as indicated by the communication path 15a, and when the transmission is completed, the operation is switched to the reception operation.

  When the radio relay 14-1 receives a fire telegram from the wireless sensor 16, the radio relay 14-1 compares the source ID included in the fire telegram with the previously registered node ID, and processes the fire telegram as an effective fire telegram if both match. ACK is transmitted to the wireless sensor 16-11.

  When the wireless sensor 16-11 stops the transmission operation and switches to the reception operation and receives the ACK transmitted by the radio wave repeater 14-1, it determines that the fire telegram has been transmitted normally and performs the transmission operation. Is terminated normally.

  On the other hand, if the wireless sensor 16-11 cannot receive the ACK, the number of messages to be transmitted continuously (hereinafter referred to as “continuous transmission”) on condition that the time from the start of the first transmission is within the transmission allocation time T1. The number of times) is increased from 2 times to 4 times, for example, is transmitted to the radio repeater 14-1 continuously for 4 times, and when the transmission is completed, the operation is switched to the reception operation to receive the ACK and receive the ACK. The transmission operation is repeated while sequentially increasing the number of continuous transmissions of messages.

  When the radio wave repeater 14-1 receives a message from the wireless sensor 16-11, the radio wave repeater 14-1 compares the message transmission source ID with the registered node ID, and an effective message when the two match. As shown in the communication path 15b to the wireless reception repeater 12-1.

  The relay transmission of the radio wave repeater 14-1 is the same as in the case of the wireless sensor 16-11. When ACK is received from the wireless reception repeater 12-1, the transmission operation is normally terminated. Is not received, the relay transmission is repeated while sequentially increasing the number of continuous transmissions of the message on the condition that the time from the start of the first transmission is within the transmission allocation time T1.

  When the wireless reception repeater 12-1 receives a fire message from the radio repeater 14-1 assigned as a child node, the wireless reception repeater 12-1 compares the fire message transmission source ID with the registered node ID, When the two match, the message is received and processed, and a fire alarm signal is transmitted to the P-type receiver 10 by supplying a alarm current as a contact output to the sensor line 18-1.

  In addition, when the wireless reception repeater 12-1 receives a fire message from the wireless sensors 16-13 and 16-14 in which the node ID is registered as a child node, the wireless transmission repeater 12-1 adds the transmission source ID of the received message. Compared with the registered node ID, the received message is processed as a valid message when the two match, and a fire alarm signal is sent to the P-type receiver 10 as a contact output for the sensor line 18-1. Send.

  The transmission operation of the wireless sensors 16-13 and 16-14 in the parent-child relationship to the wireless reception repeater 12-1 is also performed by the wireless sensors 16-11 and 16 in the parent-child relationship with the radio wave relay 14-1. As in the case of -12, when the ACK is received from the radio reception repeater 12-1, the transmission operation ends normally, but when the ACK is not received, the time from the start of the first transmission is allocated for transmission. On the condition that it is within time T1, relay transmission is repeated while sequentially increasing the number of continuous transmissions of messages.

  Further, the wireless reception repeater 12-1 is additionally registered with the transmission source ID of the received message even when the message is directly received from the wireless sensors 16-11 and 16-12 which are not assigned. Compared with the node ID, if both match, the message is processed as a valid message, and the processing result is transmitted to the P-type receiver 10.

  In the present embodiment, the radio wave repeater 14 and the wireless sensor 16 are operated normally, that is, in order to monitor whether the carry-out or the battery has run out. The wireless sensor 16 periodically transmits a periodic notification message. Regarding the transmission of the periodic notification message, the wireless sensor 16 and the radio wave repeater 14 transmit the periodic notification message for the transmission allocation time T1 from the start of transmission of the periodic notification message until the transmission suspension is required. When the ACK is received from the radio reception repeater 12, the transmission is normally completed. When the ACK is not received, the periodic notification message is continuously transmitted until the ACK is received during the remaining time of the transmission allocation time T1. Repeated transmission while increasing the number of times sequentially.

  In response to the transmission of the periodic notification message from the wireless sensor 16 and the radio wave repeater 14, the wireless reception repeater 12 receives and registers as a valid message when the message transmission source ID matches the registered node ID. The periodic notification timer provided for each node ID is reset and started.

  However, if the periodic notification timer expires after a predetermined period of time without receiving a periodic notification message, it is determined that the node is not operating properly and the periodic notification is abnormal. Notify the receiver 10 of the occurrence of a failure.

  This failure occurrence notification notifies, for example, the occurrence of failure due to abnormal periodic notification by disconnecting the terminal resistance connected to the sensor line 18 from the P-type receiver 10 to create a pseudo disconnection state.

  The wireless disaster prevention system transmits / receives fire recovery messages, fault messages, test messages, etc., in addition to the above-mentioned fire messages and periodic notification messages. be able to.

[Configuration of wireless sensor]
(Outline of wireless sensor)
FIG. 2 is a block diagram showing an outline of the functional configuration of the 1F wireless sensor 16-11 provided in FIG. The same applies to the other wireless sensors 16-12 to 16-34.

  As shown in FIG. 2, the wireless sensor 16-11 functioning as a sensor node includes a sensor control unit 20, a wireless communication unit 22, an antenna 24, a sensor unit 26, and an operation unit 28 such as a test / registration switch. And a battery 30.

  The sensor unit 26 is a temperature detection unit or a smoke detection unit (smoke detection unit). When a temperature detection unit is provided as the sensor unit 26, for example, a thermistor is used as the temperature detection element. In this case, a voltage detection signal corresponding to a change in resistance value due to temperature is output to the sensor control unit 20. In addition, when the smoke detector is provided as the sensor unit 26, the light emitter having a known scattered light type smoke detector structure is intermittently driven to emit light at a predetermined cycle according to an instruction from the sensor controller 20. The light receiving signal of the scattered light received by the light receiving unit such as a photodiode is amplified and a detection signal corresponding to the smoke density is output to the sensor control unit 20.

  The sensor control unit 20 has a function realized by executing a program, for example. As the hardware, a CPU, a memory, a computer circuit having various input / output ports, and the like are used.

(Configuration of wireless communication unit)
The wireless communication unit 22 includes a communication control unit 32, a transmission unit 34, and a reception unit 36, and is known as STD-30 (a wireless facility standard for a low power security system wireless station), which is known as a standard for a specific low power wireless station for security. 426MHz band telegram, which is a standard).

  The communication control unit 32 is a function realized by executing a program, for example, using a computer circuit having a CPU, a memory, various input / output ports and the like as hardware.

  The transmission unit 34 performs radio transmission without performing carrier sense by using the radio wave having an antenna power of 1 W or less and a frequency of 426.250 MHz or more and 426.8375 MHz or less according to the STD-30 communication standard. .

  In accordance with the STD-30 standard, the communication control unit 32 instructs the transmission unit 34 to transmit the number of consecutive transmissions n during a transmission allocation time (for example, T1 = 2 seconds) from the start of transmission of a message to the necessity of transmission suspension. For example, when n = 2, the reception unit 36 is switched to the reception state at the end of transmission. When ACK is received in this state, the transmission ends normally, but no ACK is received. In this case, during the remaining time of the transmission allocation time T1, until the ACK is received, the transmission is repeatedly performed while sequentially increasing the number n of continuous transmissions of the message.

  In this case, the communication control unit 32 increases the number of consecutive transmissions n by a power of 2 or increases by a predetermined number. When increasing by a power of 2, if the initial number of times is n = 2, the number is increased to n = 2, 4, 8, 16,. Further, when increasing by a predetermined number Δn, if the initial number is n = 2 and Δn = 2, the number is increased to n = 2, 4, 6, 8, 10,.

  In addition, the communication control unit 32 instructs the transmission unit 34 to repeat the transmission operation while sequentially increasing the number of continuous transmissions. If the transmission allocation time T1 = 2 seconds is reached, the communication control unit 32 is in the middle. In this case, the transmission is stopped, and after the transmission pause time T2 = 2 seconds, the same transmission operation is repeated, and when the predetermined number of retries is reached, the transmission is terminated abnormally.

(Configuration of sensor control unit)
The sensor control unit 20 compares, for example, a smoke concentration detection signal output from the sensor unit 26 with a predetermined threshold, determines that a fire has occurred when the threshold is exceeded, and instructs the wireless communication unit 22 to send a fire message. Send it.

  In addition, the sensor control unit 20 may recover the fire (for example, if the smoke concentration detection signal output from the sensor unit 26 falls below the threshold value for a predetermined time, for example, or continues for a predetermined number of times) And instructing the wireless communication unit 22 to transmit a fire recovery message.

[Configuration of radio wave repeater]
(Outline of radio repeater)
FIG. 3 is a block diagram schematically showing the functional configuration of the 1F radio wave repeater 14-1 provided in FIG. The same applies to the other radio repeaters 14-2 and 14-3.

  As shown in FIG. 3, the radio wave repeater 14-1 functioning as a relay node includes a relay control unit 38, a wireless communication unit 40, an antenna 42, an operation unit 44, a display unit 46, a memory 48, and a battery 50. .

  The relay control unit 38 is a function realized by, for example, execution of a program, and uses, as hardware, a computer circuit including a CPU, a memory 48, various input / output ports, and the like. In addition, a relay control table 58 is provided in the memory 48, and as shown in FIG. 1, the node IDs of the wireless sensors 16-11 and 16-12 assigned as child nodes to the radio wave repeater 14-1 are registered. ing.

  The battery 50 may be a power source unit that receives commercial AC 100 volts and converts it to a DC power source.

(Configuration of wireless communication unit)
The wireless communication unit 40 includes a communication control unit 52, a transmission unit 54, and a reception unit 56, and is known as STD-30 (a wireless facility standard for a low power security system wireless station), which is known as a standard for a specific low power wireless station for security. 426MHz band telegram, which is a standard).

  The communication control unit 52, transmission unit 54, and reception unit 56 provided in the wireless communication unit 40 are basically the same as those of the communication control unit 32, transmission unit 34, and reception unit 36 provided in the wireless communication unit 40 of FIG. Therefore, the description thereof is omitted.

(Configuration of relay control unit)
The relay control unit 38 performs relay control as a control function realized by executing the program.

  When the relay control unit 38 receives a fire message or a fire recovery message transmitted from the wireless sensor via the wireless communication unit 40, the relay control unit 38 acquires a transmission source ID included in each message, and stores it in the relay control table 58. Compared with the registered node ID, if both match, the wireless communication unit 40 is instructed to transmit an ACK and relay the received message, and if they do not match, the relay is relayed Do not send.

[Configuration of radio reception repeater]
(Overview of repeater for wireless reception)
FIG. 4 is a block diagram showing an outline of the functional configuration together with a P-type receiver, which is taken out of the radio reception repeater 12-1 functioning as a 1F disaster prevention radio node provided in FIG. The same applies to the other radio reception repeaters 12-2 and 12-3.

  The wireless reception repeater 12-1 includes a reception relay control unit 60, a wireless communication unit 62, an antenna 64, a wired communication unit 75, an operation unit 66, a display unit 68, a memory 70, and a power supply unit 72.

  The reception relay control unit 60 is a function realized by executing a program, for example. As hardware, a CPU, a memory 70, a computer circuit having various input / output ports, and the like are used. The memory 70 is provided with a relay control table 80. As shown in FIG. 1, the wireless sensors 16-13 and 16-14 assigned to the wireless reception repeater 16-1 as child nodes and radio wave repeaters. The node ID 14-1 is registered, and the node IDs of the wireless sensors 16-11 and 16-12 that are not assigned as child nodes are additionally registered.

  As shown in FIG. 1, the power supply unit 72 is supplied with direct current power from the receiver 10 through the power supply line 15, but may convert direct current power from commercial AC 100 volts to create a power source, A battery power supply may be employed.

(Configuration of wireless communication unit)
The wireless communication unit 62 includes a communication control unit 74, a transmission unit 76, and a reception unit 78, and is known as STD-30 (a wireless facility standard for a low power security system wireless station), which is known as a standard for a specific low power wireless station for security. 426MHz band telegram, which is a standard).

  The communication control unit 74, the transmission unit 76, and the reception unit 76 provided in the wireless communication unit 62 are basically the same as those of the communication control unit 32, the transmission unit 34, and the reception unit 36 provided in the wireless communication unit 40 of FIG. Therefore, the description thereof is omitted.

(Configuration of reception relay control unit)
When receiving the fire message via the wireless communication unit 62, the reception relay control unit 60 compares the transmission source ID included in this message with the node ID registered and additionally registered in the relay control table 80, and If the two match, the wireless communication unit 62 is instructed to transmit an ACK, and the wired communication unit 75 is instructed to cause a fire alarm signal by a contact output operation that causes a notification current to flow through the sensor line 18-1. Is transmitted to the P-type receiver 10.

  In addition, when the reception relay control unit 60 receives a fire recovery message via the wireless communication unit 62 after transmitting the fire alarm signal to the P-type receiver 10, the transmission source ID and relay control included in the message are transmitted. The node IDs registered and additionally registered in the table 80 are compared, and if they match, the wired communication unit 75 is instructed to cancel the contact output operation for causing the alarm current to flow through the sensor line 18-1. The control for stopping the transmission of the fire notification signal to the P-type receiver 10 is performed.

  Further, when receiving the periodic notification message via the wireless communication unit 62, the reception relay control unit 60 obtains the transmission source ID included in the message and the node ID registered and additionally registered in the relay control table 80. When the two match, the wireless communication unit 62 is instructed to transmit ACK, and the periodic notification timer provided for each node ID is reset and started, and the periodic notification message is not received. If the timer expires beyond the predetermined time, the terminator error is detected by disconnecting the terminating resistor connected to the sensor line 18-1 from the P-type receiver 10 and creating a pseudo disconnection state. Control to notify the occurrence of failure due to detection.

[Configuration of P-type receiver]
In FIG. 4, the P-type receiver 10 includes a reception control unit 82, line reception units 84-1 to 84-3, a power supply unit 86, a display unit 88, an acoustic alarm unit 90, an operation unit 92, a transfer unit 94, and A nonvolatile memory 96 is provided. In addition, the operation power supply uses the commercial power supply appropriately backed up (not shown).

  As shown in FIG. 1, the sensor lines 18-1 to 18-3 are drawn from the line receiving units 84-1 to 84-3, respectively, and the wireless reception repeater 12-1 is connected to the sensor line 18-1. Is connected.

  The line receiving unit 84-1 detects the alarm current that flows by the contact operation by the wired communication unit 75 provided in the wireless reception repeater 16-1, and outputs a fire detection signal to the reception control unit 82. The line receiving unit 84-1 regards disconnection of the termination resistor based on detection of the periodic notification abnormality in the wired communication unit 75 of the wireless reception repeater 16-1 as interruption of the monitoring current due to disconnection of the sensor line. And a failure detection signal is output to the reception control unit 82.

  The reception control unit 82 is a computer circuit having a CPU, a ROM, a RAM, an AD conversion port, and various input / output ports, and the functions of the reception control unit 82 are realized by executing a program by the CPU.

  When the reception output of the fire alarm signal is obtained by detection of the alarm current by any of the line receivers 84-1 to 84-3, the reception controller 82 determines that the corresponding sensor line is fire alarm, In addition to displaying the representative fire on the display unit 88, the area is displayed in units of lines. Also, an acoustic fire alarm is output from the acoustic alarm unit 90.

  In addition, when the reception control unit 82 detects disconnection of the sensor lines 18-1 to 18-3 by the line reception units 84-1 to 84-3, the reception control unit 82 displays a representative failure on the display unit 88 and generates a failure. The district is displayed for each line, and an acoustic failure alarm is output from the acoustic alarm unit 90.

[Message format]
FIG. 5 is an explanatory diagram showing a message format transmitted and received by the wireless disaster prevention system of FIG.

  As shown in FIG. 5, the message format includes a phase correction signal, a serial number, a transmission source ID, a data code, and an error check code. The phase correction signal is a preamble signal that repeats with a predetermined bit length of “101010... 10”, thereby making it possible to prepare for reception by phase synchronization of a reception PLL provided in the wireless communication unit.

  The serial number stores a value that changes in order in the range of 0 to 255 for each transmission of the message, and the receiving side can know the order of the message transmission. In the transmission source ID 0, the node ID of the device that is the transmission source is set, and is, for example, 32-byte data.

  The data code is information indicating the contents of the message, and a predetermined code indicating the contents of fire, fire recovery, periodic notification, test, ACK, etc. is set.

  When a transmission request is generated, the wireless sensor 16, radio wave repeater 14, and wireless reception repeater 12 provided in the wireless disaster prevention system of FIG. 1 generate a message according to this message format, and perform predetermined continuous transmission. The message is sent continuously according to the number of times.

[Transmission operation]
FIG. 6 is a time chart showing the communication operation of the wireless sensor for increasing the number of times of continuous transmission of electronic messages by a power of 2, FIG. 6 (A) shows fire detection, and FIG. 6 (B) shows the transmission standard. 6C shows normal transmission and ACK reception, and FIG. 6D shows transmission and ACK reception when a communication failure occurs.

  In FIG. 6, if the wireless sensor 16 detects a fire at time t1, if there is no communication failure, the number of continuous transmissions n = 2 at which the fire message generated based on the fire detection is initially set at time t1. Performs continuous transmission, stops radio wave emission, and switches to reception state. When the fire telegram transmitted from the wireless sensor 16 is normally received by the radio wave repeater 14, for example, ACK is transmitted, and by receiving this, the transmission of the fire telegram is terminated normally. In this case, the transmission allocation time T1 can be shorter than the period t2-t1 in FIG. 6, and interference with another radio signal can be prevented. In addition, transmission of another signal can be accelerated.

  On the other hand, if an ACK is not received at the timing indicated by the dotted line even if the transmission state is stopped and switched to the reception state after continuous transmission of fire telegrams n = 2 times at time t1 due to the occurrence of a communication failure, Switch to the transmission state, increase the number of consecutive transmissions n to n = 4, and transmit the fire telegram four times continuously.

  If the ACK cannot be received even for the four consecutive transmissions, the fire telegram is continuously transmitted eight times. If the ACK is still not received, the fire telegram is transmitted 16 times continuously. However, when the 16-time continuous transmission is started, the transmission allocation time T1 (for example, 2 seconds) elapses at the time t2 in the middle thereof, so the transmission is terminated at the time t2, and the transmission suspension time T2 at the time t2 to t3. = 2 seconds later, the same transmission operation is repeated again from time t3.

  In this case, if the communication failure is temporary, ACK is received for the second or third continuous transmission of the fire telegram, and the transmission can be normally terminated.

  On the other hand, for a fixed failure such as a device failure, when a continuous transmission operation is performed for a predetermined number of retries, it is determined that the transmission is abnormal and the transmission operation is terminated. In this case, a transmission abnormality may be displayed as an alarm with an indicator lamp, a buzzer or the like provided in the transmission source device.

  The number of times that the transmission allocation time T1 has elapsed (number of retries) may be placed on a transmission message and transmitted to the parent node (receiver, etc.). By doing so, it can be used for recognizing the time of occurrence of an abnormality or for grasping the state of radio signal transmission environment.

  FIG. 7 is a time chart showing a transmission operation in which the number of continuous transmissions of a message is increased by a predetermined number Δn = 2 times, FIG. 7 (A) shows a fire detection, FIG. 7 (B) shows a transmission standard, FIG. 7C shows normal transmission and ACK reception, and FIG. 7D shows transmission and ACK reception when a communication failure occurs.

  In the case of FIG. 7, normal transmission is the same as in FIG. 6, but ACK is transmitted at the timing indicated by the dotted line even if the fire message transmitted continuously at time t1 n = 2 times due to the occurrence of a communication failure is switched to the reception state. Is not received, the number of continuous transmissions is increased to n = 4, and a fire telegram is continuously transmitted four times. 6 times, 8 times, and 10 times, the transmission allocation time T1 = 2 seconds elapses at the time t2 in the middle of the 10 times continuous transmission, the transmission ends, and the transmission pause time T2 = 2 seconds The same transmission operation is repeated again from time t3.

  Note that the increase in the number of continuous transmissions when ACK cannot be received includes an appropriate increase. In addition, the number of continuous transmissions of the message is appropriately determined according to the communication speed of the system and the data length of the message.

[Modification of the present invention]
(Wireless disaster prevention system)
In the above embodiment, a wireless disaster prevention system is configured by a wireless sensor, a radio wave repeater, a wireless reception repeater, and a receiver, but a relatively short communication distance range that can communicate with the wireless reception repeater. If a wireless sensor is installed, a wireless disaster prevention system may be configured with the wireless sensor, the wireless reception repeater, and the receiver, except for the radio wave repeater. The wireless reception repeater and the receiver may be integrated. In a system in which a wireless signal is transmitted between wireless sensors, the transmission source node (child node) transmits an abnormal signal to the transmission destination node (parent node), and the transmission destination node returns an ACK. Can be applied.

(R type receiver)
In the above embodiment, a wireless reception repeater is connected to a sensor line from a P-type receiver as a fire receiver, but a wireless reception repeater is connected to an R-type receiver having a data transmission function. You may do it.

(Other)
The radio signal to be transmitted is not limited to a fire signal, but can be applied to another type of radio signal such as a failure.

  In the above embodiment, transmission is performed by sequentially increasing the number of transmissions at a constant rate. However, transmission may be performed without being limited to an increase of a certain rate, or may be decreased or repeated transmissions of the same number as the previous number of times. It may be included.

The present invention includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

12-1 to 12-3: wireless reception repeaters 14-1 to 14-3: radio wave repeaters 16-11 to 16-34: wireless sensors 22, 40, 62: wireless communication units 24, 42, 64 : Antennas 32, 52, 74: Communication controllers 34, 54, 76: Transmitters 36, 56, 78: Receivers 58, 80: Relay control table 60: Reception relay controller 82: Reception controller

Claims (6)

In a disaster prevention radio system that transmits and receives radio signals including disaster prevention data between a child node and a parent node based on a communication method that requires a predetermined transmission suspension time following a predetermined transmission allocation time,
When transmitting the radio signal to the parent node, the child node transmits the radio signal from the parent node after transmitting the radio signal for a predetermined transmission allocation time from the start of transmission of the radio signal to the necessity of transmission suspension. When an acknowledgment radio signal is received, transmission is terminated normally.When the acknowledgment radio signal is not received, the acknowledgment radio signal is received during the remaining time of the transmission allocation time. A wireless disaster prevention system, wherein the wireless disaster prevention system repeatedly transmits a wireless signal while continuously changing the number of times of continuous transmission.
Provided with a sensor node and a wireless disaster prevention node for detecting an abnormality in a monitoring area, and wirelessly between the sensor node and the wireless disaster prevention node based on a communication method requiring a predetermined transmission suspension time following a predetermined transmission allocation time In a wireless disaster prevention system that transmits and receives signals,
When transmitting the radio signal to the radio disaster prevention node, the sensor node transmits the radio signal after transmitting the radio signal for a predetermined transmission allocation time from the start of transmission of the radio signal to the necessity of transmission suspension. If an acknowledgment radio signal is received from the node, transmission is normally terminated. If no acknowledgment radio signal is received, an acknowledgment radio signal is received for the remaining time of the transmission allocation time. Until now, the wireless disaster prevention system is characterized in that the wireless signal is repeatedly transmitted while sequentially changing the number of times of continuous transmission of the wireless signal.
A sensor node, a radio relay node, and a radio disaster prevention node for detecting an abnormality in a monitoring area, and based on a communication method that requires a predetermined transmission suspension time following a predetermined transmission allocation time, the sensor node and the radio relay node In the radio disaster prevention system for transmitting and receiving radio signals between the radio relay node and the radio disaster prevention node, between the sensor node and the radio disaster prevention node,
When the sensor node and the radio relay node transmit the radio signal to the radio relay node or the radio disaster prevention node as a transmission destination, a predetermined transmission allocation from the start of transmission of the radio signal to the necessity of transmission suspension If the wireless signal of the confirmation response is received from the radio wave relay node or the wireless disaster prevention node that is the transmission destination after transmitting the wireless signal for a period of time, the transmission ends normally and the wireless signal of the confirmation response is not received In this case, the wireless disaster prevention system is characterized by repeatedly transmitting the number of consecutive transmissions of the wireless signal until the wireless signal of the acknowledgment response is received during the remaining time of the transmission allocation time.
4. The wireless disaster prevention system according to claim 1, wherein the child node, the sensor node, or the radio relay node receives a wireless signal of the confirmation response when the wireless signal of the confirmation response is not received. 5. Until the signal is received, the wireless disaster prevention system repeatedly transmits the number of continuous transmissions of the wireless signal by increasing the number of powers of 2 or sequentially by a predetermined number.
2. The wireless disaster prevention system according to claim 1, wherein the child node is abnormal in transmission if the confirmation response is not received even if the wireless signal is repeatedly transmitted over the predetermined transmission allocation time. Wireless disaster prevention system characterized by outputting
  The radio disaster prevention system according to claim 1, wherein the child node transmits information indicating that the radio signal is repeatedly transmitted to the parent node on the radio signal. .

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