JP6181462B2 - Wireless disaster prevention system - Google Patents

Description

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

  Conventionally, in a wireless disaster prevention monitoring system that monitors abnormalities such as fires in a warning area, a plurality of wireless sensors as sensor nodes are installed in the warning area such as each floor of a building. When a fire is detected, a telegram signal indicating the 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, the time of 3 seconds during which radio waves can be emitted is referred to as a transmission allocation time, and the time of 2 seconds during which radio waves are stopped is referred to as a transmission pause 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 message indicating the fire is generated, and this message is transmitted a plurality of times within one transmission operation time within a transmission allocation time. When continuously transmitting and receiving an ACK signal (hereinafter referred to as “ACK”) known as an acknowledgment signal from the radio reception repeater or radio wave repeater on the receiving side, it is determined that transmission was successful. The transmission operation has been completed.

  On the other hand, if the wireless sensor does not receive the ACK from the wireless reception repeater or radio wave repeater even if it continuously transmits a message indicating a fire multiple times, 2 seconds. After the elapse of the transmission suspension time, a retry operation is performed in which a plurality of messages indicating a fire are continuously transmitted again. If ACK is not received, the same transmission is performed with a transmission suspension time until the predetermined number of retries is reached. Repeat the operation.

  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.

  In addition, after detecting a fire and sending a message indicating a fire, the wireless sensor generates and sends a message indicating a fire recovery when a fire recovery is detected. Message indicating failure, message indicating failure, activation or test message used for node ID registration is transmitted as necessary, and any message transmission is transmitted once within the transmission allotted time like the message indicating fire. Sending continuously several times during operation.

  However, if the number of continuous transmissions of messages is recovered due to the occurrence of radio interference during continuous transmission, if the number of continuous transmissions of messages is large, there is a possibility that the message will be received normally when the radio interference is recovered However, in the past, even if the transmission information is different, the number of continuous transmissions is the same for all messages.For example, even an important message indicating a fire is the same as a message indicating a relatively low importance, for example, a periodic report. There is a possibility that sufficient communication reliability cannot be ensured when a communication failure occurs for an important message.

The present invention is directed to a communication system that requires a predetermined transmission suspension time following a predetermined transmission allocation time, and a wireless disaster prevention system that can improve the reliability of communication with respect to a communication failure according to the importance of transmission information The purpose is to provide.

The present invention transmits and receives a radio signal between a child node and a parent node based on a communication scheme that requires a predetermined transmission suspension time following a predetermined transmission allocation time, and wirelessly transmits between the child node and the transmission allocation time. In a wireless disaster prevention system that can transmit signals multiple times in succession,
The child node waits for reception of the acknowledgment response radio signal after continuously transmitting the same radio signal for the predetermined number of consecutive transmissions according to the importance of the transmission information within the transmission allocation time, and waits for reception. If the wireless signal of the acknowledgment response is received from the parent node within the time of, the transmission ends normally, and if the wireless signal of the acknowledgment response is not received within the reception waiting time, during the remaining time of the transmission allocation time, Until the wireless signal of the confirmation response is received, continuous transmission and reception standby of the same wireless signal by a predetermined number of continuous transmissions according to the importance of the transmission information are repeated.

Child nodes, you continuously transmitted severity increases the continuous transmission times of higher same radio signal transmission information.

  The child node is a sensor node that detects an abnormality in the monitoring area, and the parent node is a wireless repeater that receives a radio signal indicating that an abnormality from the sensor node has been detected.

Child node, the importance of the wireless signal indicating the fire is set high, Ru is set lower than the radio signals the importance of the wireless signal indicating the non-fire indicates fire.

  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. In this case, within a transmission allocation time, after continuously transmitting a radio signal for a predetermined number of continuous transmissions according to the importance of transmission information, if a radio signal of an acknowledgment is received from the radio disaster prevention node, the transmission is terminated normally. If no acknowledgment radio signal is received from the radio disaster prevention node, the number of consecutive transmissions depends on the importance of the transmission information until the acknowledgment radio signal is received for the remaining time of the transmission allocation time. Since continuous transmission of wireless signals is repeated, for wireless signals that indicate the first most important fire and the highest fire, the number of continuous transmissions is 4 By increasing the number of times, the possibility of continuous transmission continuing at the timing when the communication failure temporarily occurred during continuous transmission is recovered, and after the communication failure is recovered, the wireless disaster prevention node reliably shows a fire It is possible to suppress the time delay from receiving the signal and outputting the fire alarm from the receiver.

  On the other hand, for wireless signals that indicate a low level of fire compared to fire, for example, for fire recovery, the number of continuous transmissions is set to 4 times, for example, in the same way as in the past. Although the communication reliability is low, it is possible to ensure the same communication reliability as before.

Furthermore, for wireless signals indicating periodic reports that are less important than fire or fire restoration, the number of continuous transmissions is set to less than 4 times, for example, 2 times, so that transmission is performed without performing carrier sense. The frequency of communication as a whole system is reduced, and transmission errors due to radio signal collisions can be suppressed.

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 P-type receiver Explanatory drawing showing the message format used in the wireless disaster prevention system Time chart showing fire telegram transmission Time chart showing the operation of sending a fire recovery message Time chart showing the operation of sending periodic notification messages

[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. Further, the wireless sensor 16 and the radio relay 14 are also in a parent-child relationship, the wireless sensor 16 is a child node, and the radio relay 14 is a parent node. Further, the radio reception repeater 12 and the radio relay 14 are also in a parent-child relationship, the radio relay 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 it is within transmission allocation time T1, the continuous transmission which repeats transmission and a stop of a radio wave as needed can be performed.

  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.

  When a transmission request is generated, the wireless sensor 16 continuously transmits a wireless signal for a predetermined number of consecutive transmissions n according to the importance of transmission information within a transmission allocation time T1, and then transmits a wireless signal as an acknowledgment response. If received, the transmission is terminated normally. On the other hand, if the acknowledgment radio signal is not received, the transmission information is given importance until the acknowledgment radio signal is received for the remaining time of the transmission allocation time. The wireless signal is continuously transmitted by a predetermined number of consecutive transmissions n.

  For example, in the case where the wireless sensor 16-11 outputs a signal that detects the most important fire, the wireless sensor 16-11 generates a message of a predetermined format including fire data "hereinafter referred to as" fire message "". Then, this fire telegram is transmitted to the radio repeater 14-1 continuously as shown by the communication path 15a, for a predetermined number of continuous transmissions n, for example, n = 8 times set in advance according to the importance, and transmitted. When finished, switch to receiving operation.

  When the radio relay 14-1 receives a continuously transmitted fire telegram, the radio relay 14-1 compares the source ID included in the fire telegram with a pre-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 consecutive transmissions n = 8 according to the importance level on condition that the time from the first transmission start is within the transmission allocation time T1. Times, the fire message is continuously transmitted to the radio repeater 14-1, and when the transmission is finished, the operation is switched to the reception operation, the ACK is received, and the number of times of continuous transmission of the message is n = 8 until the ACK is received. Repeat the continuous transmission of fire 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.

  In the relay transmission of the radio wave repeater 14-1, since the relay information is the fire having the highest importance, a predetermined number of continuous transmissions n set in advance according to the importance, for example, n = 8 consecutive times. To the wireless reception repeater 12-1, and when the transmission is completed, the operation is switched to the reception operation. The more important information such as fire, the more the number of continuous transmissions n, the longer the transmission time, and the higher the reliability of reception.

  After performing the continuous transmission of the fire telegram, the radio wave repeater 14-1 normally ends the transmission operation when receiving the ACK from the wireless reception repeater 12-1, but if the ACK is not received, On the condition that the time from the start of the first transmission is within the transmission allocation time T1, the relay transmission of the fire message with the continuous transmission count n = 8 is repeated.

  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, the fire message is transmitted to the wireless reception repeater 12-1 continuously by a predetermined number n of continuous transmissions set in advance according to the importance, for example, n = 8 times. When the ACK is received from the reception repeater 12-1, the transmission operation is normally terminated. However, when the ACK is not received, on the condition that the time from the first transmission start is within the transmission allocation time T1. Repeat the continuous transmission of fire messages with the number of continuous transmissions n = 8.

  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 received node ID, when the two match, the message is processed as a valid message, and the processing result is transmitted to the P-type receiver 10.

  In addition, when the wireless sensor 16-11 that has detected a fire detects fire recovery thereafter, a predetermined number of continuous transmissions in which a fire recovery message (first message after recovery) is set in advance according to the importance level. n, for example, n = 4 times continuously transmitted to the radio repeater 14-1 as indicated by the communication path 15a. When the transmission is completed, the operation is switched to the reception operation, and the ACK transmitted by the radio repeater 14-1 is received. If this is the case, it is determined that the fire recovery message has been transmitted normally, and the transmission operation ends normally.

  On the other hand, if the wireless sensor 16-11 cannot receive the ACK, the fire recovery message with the number of continuous transmissions n = 4 on the condition that the time from the start of the first transmission is within the transmission allocation time T1. Repeat the continuous transmission.

  The radio wave repeater 14-1 that has effectively received the fire recovery message from the wireless sensor 16-11 continuously relays the fire recovery message with the number of continuous transmissions n = 4 set in advance according to the importance. When transmission is performed and an ACK is received from the radio reception repeater 12-1, the transmission operation ends normally. However, when the ACK is not received, the time from the start of the first transmission is within the transmission allocation time T1. On this condition, the relay transmission of the fire recovery message with the continuous transmission count n = 4 is repeated.

  When receiving the fire recovery message from the radio repeater 14-1, the radio reception repeater 12-1 cancels the contact output to the sensor line 18-1, stops the alarm current, and receives the P-type reception. Although the transmission of the fire alarm signal to the machine 10 is stopped, the P-type receiver 10 maintains the alarm state and waits for the recovery operation by the person in charge by the on-site confirmation. In the process by the fire restoration, only the restoration display may be performed by the wireless reception repeater 12-1, and the transmission of the fire alarm signal to the P-type receiver 10 may be maintained.

  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.

  The radio wave repeater 14 and the wireless sensor 16 transmit the periodic notification message in accordance with the predetermined number of continuous transmissions n set in advance according to the importance of the periodic notification message, for example, n = 2 times continuously. When the ACK is received, the transmission operation is normally terminated. On the other hand, when the radio wave repeater 14 and the wireless sensor 16 cannot receive the ACK from the wireless reception repeater 12, the first transmission starts. If the time from is within the transmission allocation time T1, the periodic transmission message is continuously transmitted n = 2 times according to the importance, and the periodic notification message is continuously transmitted. Until the ACK can be received, the continuous transmission of the periodic notification message in which the number of continuous transmissions of the message n = 2 is repeated.

  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 includes the failure message and node ID in addition to the above-mentioned most important fire message, the next most important fire recovery message (the first transmission message after recovery), and the relatively low periodic report message. The startup message and the test message used for registration are transmitted / received. The number n of continuous transmissions corresponding to the importance of these messages is set to n = 2 as in the case of the regular notification message. Further, the relationship between the importance of the message and the number of continuous transmissions according to the importance can be determined as needed, and the number of continuous transmissions is increased as the importance increases.

[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. 426 MHz band radio signal (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 a radio wave having an antenna power of 10 mW or less and a frequency of 426.250 MHz or more and 426.8375 MHz or less according to the STD-30 communication standard. .

  The communication control unit 32 instructs the transmission unit 34 in accordance with the STD-30 standard, and the importance of the message during the transmission allocation time (for example, T1 = 2 seconds) from the start of transmission of the message to the necessity of transmission suspension. The message is continuously transmitted according to the number of consecutive transmissions n set in advance, and at the end of transmission, the receiving unit 36 is switched to the reception state. When ACK is received in this state, transmission ends normally, but ACK cannot be received. In this case, during the remaining time of the transmission allocation time T1, until the ACK can be received, the control of repeating the continuous transmission of the message with the number of continuous transmissions n set in advance according to the importance of the message is performed.

  In this case, the communication control unit 32 sets the number n of continuous transmissions of the fire message with the highest importance, which is the first importance, to n = 8, and the fire restoration message with the second highest importance, which is the second most important. The number of continuous transmissions n is n = 4, and the number of continuous transmissions of messages such as periodic notification messages with the third lowest importance is set to n = 2, and the number of continuous transmissions is set according to the importance of the message. Controls the continuous transmission of messages so that the number of continuous transmissions is n.

  In addition, the communication control unit 32 instructs the transmission unit 34 to repeat transmission at the number of consecutive transmissions n according to importance, and when the transmission allocation time T1 = 2 seconds is reached, the communication control unit 32 is in the middle. However, after the transmission pause time T2 = 2 seconds has elapsed, similar continuous transmission is repeated, and control is performed to terminate transmission abnormally when a predetermined number of retries, for example, seven, is reached.

(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. Control to send.

  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) Control to send a fire recovery message to the wireless communication unit 22.

  In addition, the sensor control unit 20 performs a control to instruct the wireless communication unit 22 to periodically report and transmit a periodic notification message.

  In addition, when detecting the registration mode set by the operation unit 28, the sensor control unit 20 generates an activation message or a test message in which a node ID known as a device ID is set as a transmission source ID, and the wireless communication unit 22 Is instructed to transmit a periodic report, and the node ID is registered in the radio wave repeater 14-1.

[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 other radio wave repeaters 14-2 and 14-3 have the same configuration.

  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 transmission unit 54 and the reception unit 56 provided in the wireless communication unit 40 are basically the same as the transmission unit 34 and the reception unit 36 provided in the wireless communication unit 40 of FIG. .

  When the communication control unit 40 relays and transmits a message based on an instruction from the relay control unit 38, n = 8 is set as the number of consecutive transmissions of the fire message having the highest importance, which is the first importance, and the second importance. The number n of continuous transmissions of the next most important fire recovery message is n = 4, and the number n of continuous transmissions of messages such as periodic notification messages of the third least important importance is n = 2. Is set in advance, and the continuous relay transmission of the message is controlled so that the number of times of continuous transmission is n according to the importance of the message.

  In addition, the communication control unit 40 instructs the transmission unit 54 to repeat the relay transmission with the continuous transmission count n according to the importance, and when the transmission allocation time T1 = 2 seconds is reached, the communication control unit 40 Even if there is, the relay transmission is stopped, and after the transmission suspension time T2 = 2 seconds, the same relay transmission is repeated, and when the predetermined number of retries is reached, for example, 7 times, the relay transmission is terminated abnormally.

(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 send an ACK and then relay the received message, and if they do not match, Does not perform relay transmission.

  In addition, the relay control unit 38 periodically instructs the wireless communication unit 40 to make a periodic report and performs control to transmit a periodic report message.

  The relay control unit 38 receives the activation message or the test message from the wireless sensor 16 assigned as the child node and registers the node ID of the wireless sensor in the relay control table 58 every time the node ID is registered. The ID is read out, the wireless communication unit 40 is instructed, a control for transmitting a registration message is performed, and additional registration is performed on the wireless reception repeater 12 side.

[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 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 12-1 as child nodes and radio wave repeaters. The node ID of 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 DC power from the P-type receiver 10 through the power line 15. However, the power supply unit 72 may generate DC power by converting DC power from commercial AC 100 volts. However, a battery power source may be adopted.

(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, transmission unit 76, and reception unit 78 provided in the wireless communication unit 62 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 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 wireless communication unit 62 is instructed to transmit ACK, and the wired communication unit 75 is instructed to detect the sensor line. The contact output operation for causing the alarm current to flow through 18-1 is canceled, and the transmission of the fire notification signal to the P-type receiver 10 is stopped.

  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 through the contact operation by the wired communication unit 75 provided in the wireless reception repeater 12-1 and outputs a fire detection signal to the reception control unit 82. In addition, the line receiving unit 84-1 regards the disconnection of the termination resistor based on the detection of the periodic notification abnormality in the wired communication unit 75 of the wireless reception repeater 12-1 as the interruption of the monitoring current due to the 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, A representative fire display is displayed on the display unit 88, and a fire occurrence area is displayed by a line display for each line. 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, the node ID of the device that is the transmission source is set.

  The data code is information indicating the contents of the message, and a predetermined code indicating the contents of fire, fire recovery, periodic notification, failure, activation, 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 the importance of the message The message is continuously transmitted according to the number of times of continuous transmission according to.

[Transmission operation]
FIG. 6 is a time chart showing a transmission operation when a fire is detected by a wireless sensor, FIG. 6 (A) shows a fire detection, FIG. 6 (B) shows a transmission standard, and FIG. ) Shows normal transmission and ACK reception, and FIG. 6D shows transmission and ACK reception when a communication failure occurs. Note that the time width of the transmission allocation time T1 in FIG. 6 does not coincide with the scale of the time width of the transmission suspension period T2 in order to secure a space for writing the messages in FIGS. 6 (C) and 6 (D).

  In FIG. 6, if the wireless sensor 16 detects a fire at time t1, if there is no communication failure, the fire telegram generated based on the fire detection at time t1 is set according to its importance. The number of times of transmission is n = 8 times, and the transmission is switched to the reception state when transmission is completed. When the fire telegram transmitted by the wireless sensor 16 is normally received by the radio wave repeater 14, for example, an ACK is transmitted, and the transmission is normally terminated by receiving this ACK.

  On the other hand, if an ACK is not received at the timing indicated by the dotted line even when switching to the reception state for a fire message with continuous transmission n = 8 continuous transmissions at time t1 due to the occurrence of a communication failure, the number of continuous transmissions Repeat the continuous transmission of fire messages with n = 8 until ACK is received. In this case, if the communication failure is temporary, the 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, if the transmission allocation time T1 = 2 seconds elapses at the time t2 during the continuous transmission of the fire telegram without receiving the ACK, the transmission is terminated, and the transmission pause time T2 = 2 seconds is released. The same transmission operation is repeated again from t3. If the number of continuous transmission retries reaches the predetermined number and ACK cannot be received, the transmission operation is terminated abnormally.

  FIG. 7 is a time chart showing a transmission operation when a fire recovery is detected after detecting a fire with a wireless sensor, FIG. 7 (A) shows a fire recovery, and 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 FIG. 7, if the wireless sensor 16 detects a fire recovery at time t4, if there is no communication failure, the fire recovery message generated based on the detection of the fire recovery at time t4, according to its importance. The set number of continuous transmissions n = 4 is performed continuously, and the transmission is switched to the reception state when transmission is completed. When the fire recovery message transmitted by the wireless sensor 16 is normally received by the radio wave repeater 14, for example, an ACK is transmitted, and the transmission is terminated normally by receiving this ACK.

  On the other hand, if a communication failure occurs and the ACK is not received at the timing indicated by the dotted line even when switching to the reception state for a fire recovery message with continuous transmission number n = 4 at time t4, continuous transmission is performed. Repeat the continuous transmission of the fire recovery message with the number of times n = 4 until ACK is received. In this case, if the communication failure is temporary, ACK is received for subsequent continuous transmission of fire recovery messages, and transmission can be normally terminated.

  On the other hand, if the transmission allocation time T1 = 2 seconds elapses at time t5 during the continuous transmission of the fire telegram without receiving the ACK, the transmission is terminated, and the transmission pause time T2 = 2 seconds is passed. The same transmission operation is repeated again from t3. If the number of retries for continuous transmission reaches a predetermined number, for example, seven, and ACK cannot be received yet, the transmission operation is terminated abnormally at time t7.

  FIG. 8 is a time chart showing the transmission operation of the periodic notification message by the wireless sensor. FIG. 8 (A) shows the periodic notification timing, FIG. 8 (B) shows the transmission standard, and FIG. 8 (C). Shows normal transmission and ACK reception, and FIG. 8D shows transmission and ACK reception when a communication failure occurs.

  In FIG. 8, if the wireless sensor 16 detects the periodic notification timing at time t8, when there is no communication failure, the number of consecutive transmissions n = 2 set at time t48 according to the importance of the periodic notification message. After continuous transmission, switch to the reception state when transmission is completed. When the periodic notification message transmitted by the wireless sensor 16 is normally received by, for example, the radio wave repeater 14, an ACK is transmitted.

  On the other hand, if a ACK is not received at the timing indicated by the dotted line even when switching to the reception state for the periodic notification message by continuous transmission n = 2 times at time t8 due to the occurrence of communication failure, continuous transmission is performed. The continuous transmission of the periodic notification message with the number of times n = 2 is repeated until ACK is received. In this case, if the communication failure is temporary, ACK is received for the subsequent continuous transmission of the periodic notification message, and the transmission can be terminated normally.

  On the other hand, if the ACK cannot be received and the periodic notification message is continuously transmitted, the number of retries for the continuous transmission reaches a predetermined number of times, for example, 7 times, and if the ACK is still not received, the transmission operation is terminated abnormally at time t9. To do. In this case, the continuous transmission by retry falls within the transmission allocation time T1 = 2 seconds from time t8, so that the communication frequency of the entire system can be suppressed.

[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 radio reception repeater and the receiver may be integrated.

(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.

(Importance and priority)
In the above embodiment, the number of times of continuous transmission of the radio signal is set according to the importance of the transmission information transmitted by the radio signal, but the importance of the transmission information is substantially synonymous with the priority of the transmission information. Yes, the number of continuous transmissions of wireless signals may be set according to the priority of transmission information transmitted by wireless signals.

  When an event having a higher priority than the radio signal being transmitted occurs, priority transmission may be performed by switching to a radio signal having a higher priority.

(Other)
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.

10: P-type receivers 12-1 to 12-3: Radio reception repeaters 14-1 to 14-3: Radio wave repeaters 16-11 to 16-34: Wireless sensors 18-1 to 18-3: Sensor line 20: Sensor control unit 22, 40, 62: Wireless communication unit 24, 42, 64: Antenna 26: Sensor unit 32, 52, 74: Communication control unit 34, 54, 76: Transmission unit 36, 56, 78: Reception unit 38: Relay control unit 58, 80: Relay control table 60: Reception relay control unit

Claims (4)

Based on a communication scheme that requires a predetermined transmission suspension time following a predetermined transmission allocation time, a radio signal is transmitted and received between the child node and the parent node, and a radio signal is transmitted from the child node during the transmission allocation time. In the wireless disaster prevention system that can transmit multiple times continuously,
The child node waits to receive a radio signal of an acknowledgment response after continuously transmitting the same radio signal a predetermined number of times of continuous transmission according to the importance of transmission information within the transmission allocation time, when receiving the radio signal of the acknowledgment from the parent node in the reception waiting time is normally terminates the transmission, when the wireless signal of the acknowledgment in the reception waiting time is not received, the transmission allocation during the remaining time of the time until the radio signal of the acknowledgment is received, repeating the continuous transmission and the reception stand of the same radio signal by a predetermined continuous transmission times in accordance with the importance of the transmitted information A wireless disaster prevention system characterized by that.
In wireless disaster prevention system according to claim 1, said child node, the wireless disaster to importance increases the continuous transmission times of higher the same radio signal features that you continuous transmission of the transmission information system.
In wireless disaster prevention system according to claim 1, said child node is a sensor node that detects an abnormality of a monitored area, said parent node receives a radio signal indicating an abnormality is detected from the sensor node A wireless disaster prevention system characterized by being a wireless repeater.
In wireless disaster prevention system according to claim 2, the child node is set importance is high in a radio signal indicating the fire, lower than the radio signal indicating the importance of said fire radio signal indicating a non-fire wireless disaster system characterized in that it is.

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