JP2010272065A - Sensor terminal, sensor terminal abnormality determination information transmission method, controller and controller sensor abnormality determination method - Google Patents

Abstract

An abnormality determination of a wireless sensor terminal is performed more accurately.
Sensor terminals 120a and 120b periodically update an adjacent table having information on communication possibility and estimated distance with other nodes (502, 512). The controller 101 periodically receives a sensor information acquisition request response including an adjacent table from the sensor terminals 120a and 120b (521,531), and has information on communication possibility and estimated distance with other nodes for each node. The integration table is updated (540). The controller 101 updates the past information table having past information created based on the information held in the past updated integrated table as the integrated table is updated (541). Based on the comparison result between the integrated table and the past information table, the controller 101 determines whether the sensor terminals 120a and 120b are abnormal (destroy / stop or move), the possibility of communication between the controller 101 and other sensor terminals, and the estimated distance. It judges using the information of (542).
[Selection] Figure 14

Description

  The present invention relates to a sensor terminal, a sensor terminal abnormality determination information transmission method, a controller, and a sensor abnormality determination method of a controller, and more particularly to a sensor terminal used as a node of a wireless security system.

  Conventionally, the introduction of security systems to ordinary households and businesses has increased rapidly. Further, in the conventional standardized technology such as IEEE802.11 wireless LAN system, IEEE802.15.4 ZigBee, etc. using the 2.4 GHz band that can be used without a license, the power consumption is reduced and the size is reduced. And cost reduction is progressing. Sensor terminals (camera, infrared, vibration, gas, smoke / heat, emergency button, etc.) used in the security system are a means of communication with the controller because of the ease of installation work that requires only battery operation or electrical wiring. It is assumed that those using wireless systems will increase.

  FIG. 15 shows a configuration example of a conventional general security system 200. The security system 200 includes a controller 201, indoor sensors 202 and 203, and outdoor sensors 204 and 205. The indoor sensors 202 and 203 and the outdoor sensors 204 and 205 are connected to the controller 201 via a wired control / communication network 206. Here, the indoor sensors 202 and 203 and the outdoor sensors 204 and 205 are sensor terminals such as cameras, infrared rays, vibrations, gas, smoke / heat, and emergency buttons.

  The controller 201 controls the operations of the indoor sensors 202 and 203 and the outdoor sensors 204 and 205 via the network 206. Further, the controller 201 receives sensor information from the indoor sensors 202 and 203 and the outdoor sensors 204 and 205 via the network 206 and determines the occurrence of an abnormal state. When the controller 201 determines that an abnormal state has occurred, the controller 201 issues a report to the centralized monitoring center 302 via the external connection network 301.

  In the security system 200 as shown in FIG. 15, a wireless security system is a wireless control / communication network 206 portion. In this wireless security system, a wireless sensor terminal is used. In order for the wireless security system to operate normally against an intruder from the outside, it is important to detect the destruction / stop and movement of the wireless sensor terminal by a malicious person. However, in this wireless sensor terminal, since the communication path itself may become unstable, it is difficult to detect destruction / stop and movement by a Service-to-Self.

  For example, an abnormality detection method is generally used in which communication between a sensor terminal and a controller is periodically performed and the sensor terminal is abnormal when communication becomes impossible. However, with this method, even when the wireless status is temporarily unstable and communication is impossible, it is regarded as abnormal, and many false alarms occur.

  Further, for example, Patent Documents 1 and 2 propose a method of detecting an abnormality by analyzing a camera video obtained by a sensor terminal. However, this method requires a camera function for the sensor terminal, and generally requires the processing capability of the processing unit mounted on the camera side, and therefore cannot be used for an inexpensive sensor terminal.

  Further, for example, Patent Literature 3 proposes a method of detecting a change in location or orientation by a Service-to-Self by adding an acceleration sensor or the like to the sensor terminal. However, this method requires an additional sensor such as an acceleration sensor, which cannot be used with an inexpensive sensor terminal.

  Further, for example, Patent Literature 4 proposes a technique for obtaining communication possibility and distance information by communication between terminals and detecting intrusion / destruction. However, in this method, what is finally used is network structure information, and abnormal terminal information obtained in the generation process is treated as invalid information.

JP 2006-338187 A JP 2008-160617 A JP 2008-167222 A Japanese Patent No. 3877167

  As described above, in the wireless sensor terminal constituting the wireless security system, it is difficult for a malicious person to detect destruction / stop and movement.

  An object of the present invention is to make it possible to more accurately determine abnormality (destruction / stop, movement) of wireless sensor terminals constituting a wireless security system.

The concept of this invention is
A sensor unit;
A first transmitter that wirelessly transmits sensor information of the sensor unit to the controller;
A second transmitter for periodically transmitting a confirmation information request to other nodes;
A first receiver that wirelessly receives a confirmation information response sent from the other node in response to the confirmation information request transmitted by the second transmitter;
Based on the confirmation information response received by the first receiving unit, an adjacent table updating unit that periodically updates at least an adjacent table having communication possibility information with the other nodes;
A second receiving unit for receiving a sensor information acquisition request sent from the controller;
In response to the sensor information acquisition request received by the second receiver, the sensor terminal includes a third transmitter that wirelessly transmits the adjacent table to the controller as abnormality determination information.

The concept of the present invention is
A first receiver that wirelessly receives sensor information sent from a plurality of sensor terminals;
A first transmitter that wirelessly transmits sensor information acquisition requests to the plurality of sensor terminals; and a plurality of sensor terminals that transmit the sensor information acquisition requests transmitted by the first transmitter. A second receiving unit that receives an adjacency table having at least communication possibility information with other nodes;
Based on the adjacent table of the plurality of sensor terminals received by the second receiving unit, an integrated table update periodically updating an integrated table having information on the possibility of communication with other nodes for each node. And
A past information table update unit for updating a past information table having past information created based on information held in the integrated table updated in the past by the integrated table update unit, as the integrated table is updated;
A controller comprising: a sensor abnormality determination unit that compares the integrated table updated by the integrated table update unit and the past information table updated by the past information table update unit, and determines whether the plurality of sensor terminals are destroyed or stopped. It is in.

  In this invention, the sensor information of the sensor unit of the sensor terminal is wirelessly transmitted to the controller. The controller determines the occurrence of an abnormal state based on this sensor information. When it is determined that an abnormal state has occurred, a notification is issued from the controller to the centralized monitoring center via the external connection network.

  A confirmation information request is periodically transmitted from the sensor terminal to another node by radio. Here, the other nodes are a controller and other sensor terminals. In the sensor terminal, based on the confirmation information response sent from the other node, at least the adjacency table having information on the possibility of communication with the other node is updated. Note that this adjacency table may further include information on the estimated distance from other nodes. In the sensor terminal, information on the estimated distance is obtained based on the received signal strength when receiving the confirmation information response from each node.

  A sensor information acquisition request is periodically transmitted from the controller to the sensor terminal. Then, in response to the sensor information acquisition request, the adjacent table is wirelessly transmitted as abnormality determination information from the sensor terminal to the controller. In the controller, an integrated table having information on the possibility of communication with other nodes is updated for each node based on the adjacent tables sent from the plurality of sensor terminals. When the adjacent table further has information on the estimated distance to other nodes, the integrated table also has information on the estimated distance to other nodes for each node.

  In the controller, the past information table created based on the information held in the integrated table updated in the past is updated as the integrated table is updated. Then, the controller compares the integrated table with the past information table, and determines whether the plurality of sensor terminals are destroyed or stopped. For example, when communication between the predetermined sensor terminal is impossible and communication between the predetermined sensor terminal and another sensor terminal is impossible, the predetermined sensor terminal is destroyed. Or it is judged that it stopped.

  In addition, when the integrated table further has information on the estimated distance between other nodes for each node, the controller compares the integrated table with the past information table and determines the movement of the plurality of sensor terminals. For example, when there is a predetermined number or more of estimated distances that exceed the threshold among a plurality of estimated distances between the predetermined sensor terminal and another node, it is determined that the predetermined sensor terminal is moved. Is done.

  In this way, an adjacency table having information on the possibility of communication with another node and information on the estimated distance with another node is sent from each sensor terminal to the controller. Therefore, in the controller, when determining whether the predetermined sensor terminal is destroyed or stopped, not only the information on the possibility of communication with the predetermined sensor terminal but also between the predetermined sensor terminal and another sensor terminal. Communication possibility information can also be used, and a more accurate determination can be made. In addition, when the controller determines the movement of the predetermined sensor terminal, not only the information on the estimated distance between the predetermined sensor terminal but also the estimated distance between the predetermined sensor terminal and another sensor terminal. Information can also be used. Therefore, it is possible to make a more accurate determination.

  According to the present invention, an adjacency table having information on the possibility of communication with other nodes and information on the estimated distance with other nodes is sent from each sensor terminal to the controller. Therefore, in the controller, an abnormality (destruction / stop, movement) of a predetermined sensor terminal is communicated between the predetermined sensor terminal and other sensor terminals in addition to information on the possibility of communication with the predetermined sensor terminal and estimated distance. Can also be determined using information on the possibility of communication and the estimated distance, and the accuracy can be improved.

It is a block diagram which shows the structural example of the security system as embodiment of this invention. It is a block diagram which shows the structural example of the controller which comprises a security system. It is a block diagram which shows the structural example of the sensor terminal which comprises a security system. It is a flowchart which shows the procedure of the control process of CPU of a sensor terminal for judging abnormality of a sensor terminal. It is a figure which shows an example of the adjacent table produced | generated by a sensor terminal. It is a figure which shows an example of the graph information which shows the correspondence of S / N ratio used in order to obtain | require an estimated distance, and distance. It is a flowchart which shows the procedure of the control processing of CPU of a controller for judging abnormality of a sensor terminal. It is a figure which shows an example of the integrated table produced | generated by a controller. It is a figure which shows an example of the past information table produced | generated by a controller. It is a figure which shows the example of an integrated table for demonstrating the example which CPU of a controller judges abnormality (destruction / stop) of a sensor terminal. It is a figure which shows the past information table example for demonstrating the example which CPU of a controller judges abnormality (destruction / stop) of a sensor terminal. It is a figure which shows the example of an integrated table for demonstrating the example which CPU of a controller judges abnormality (movement) of a sensor terminal. It is a figure which shows the past information table example for demonstrating the example which CPU of a controller judges abnormality (movement) of a sensor terminal. It is a figure for demonstrating the example of a sequence between the controller for performing abnormality determination of a sensor terminal, and a sensor terminal. It is a block diagram which shows the structural example of the conventional general security system.

Hereinafter, modes for carrying out the invention (hereinafter referred to as “embodiments”) will be described. The description will be given in the following order.
1. Embodiment 2. FIG. Modified example

<1. Embodiment>
[Security system configuration example]
FIG. 1 shows a configuration example of a security system 100 as an embodiment. The security system 100 includes a controller 101, indoor sensors 102 and 103, and outdoor sensors 104 and 105. The controller 101, indoor sensors 102 and 103, and outdoor sensors 104 and 105 are connected to each other wirelessly via a wireless network 106. In this case, the controller 101 and each sensor terminal can be connected in a peer-to-peer form.

  The wireless network 106 is realized by, for example, building an ad hoc network in a wireless LAN, or using a unique management frame. Here, the indoor sensors 102 and 103 and the outdoor sensors 104 and 105 are sensor terminals such as cameras, infrared rays, vibrations, gas, smoke / heat, and emergency buttons. The controller 101, indoor sensors 102 and 103, and outdoor sensors 104 and 105 each constitute a node of the wireless network 106.

  The controller 101 controls the operations of the indoor sensors 102 and 103 and the outdoor sensors 104 and 105 via the network 106. Further, the controller 101 receives sensor information from the indoor sensors 102 and 103 and the outdoor sensors 104 and 105 via the network 106 and determines the occurrence of an abnormal state. When the controller 101 determines that an abnormal state has occurred, the controller 101 issues a notification to the centralized monitoring center 302 via the external connection network 301.

  In addition, each sensor terminal (indoor sensors 102 and 103, outdoor sensors 104 and 105) periodically creates an adjacent table including information on the possibility of communication with other nodes (sensor terminals and controllers) and information on estimated distances. And wirelessly transmitted to the controller 101. In this case, each sensor terminal transmits a confirmation information request to another node and receives a confirmation information response from the other node. Each sensor terminal is assumed to be able to communicate with the node from which the confirmation information response has been received. Also, each sensor terminal acquires information on the estimated distance based on the received signal strength at the time of reception of the node from which the confirmation information response has been received.

  The controller 101 updates the integrated table having information on the possibility of communication with other nodes for each node based on the adjacent table periodically received from each sensor terminal. Further, the controller 101 updates a past information table created based on information held in the integrated table updated in the past as the integrated table is updated. The controller 101 compares the integrated table with the past information table, and determines an abnormality (destruction / stop, movement) of each sensor terminal.

  For example, when the communication between the predetermined sensor terminal becomes impossible and the communication between the predetermined sensor terminal and another sensor terminal becomes impossible, the controller 101 Judged as destroyed or stopped. For example, when the controller 101 has a predetermined number or more of the estimated distances that change beyond the threshold among a plurality of estimated distances between the predetermined sensor terminal and another node, the predetermined sensor terminal Judge that it has been moved. Then, the controller 101 issues a notification to the centralized monitoring center 302 via the network 301 when an abnormality of the sensor terminal is detected.

[Configuration example of controller and sensor terminal]
FIG. 2 shows a configuration example of the controller 101. The controller 101 includes a CPU (Central Processing Unit) 111, a ROM (Read Only Memory) 112, and a RAM (Random Access Memory) 113. The controller 101 also includes a network interface 114, a wireless module 115, and an antenna 116. The CPU 111, ROM 112, RAM 113, network interface 114, and wireless module 115 are connected to the internal bus 117.

  The CPU 111 controls the operation of each unit of the controller 101. The ROM 112 stores control software. The RAM 113 constitutes a work area for the CPU 111. The CPU 111 develops the software read from the ROM 112 on the RAM 113 to activate the software, and controls each unit of the controller 101. The network interface 114 performs network communication with the centralized monitoring center 302 through the network 301. The wireless module 115 performs wireless communication with the sensor terminal through the antenna 116.

  FIG. 3 shows a configuration example of the sensor terminal 120 (indoor sensors 102 and 103, outdoor sensors 103 and 104). The sensor terminal 120 includes a CPU 121, a ROM 122, and a RAM 123. The sensor terminal 120 includes a sensor unit 124, a wireless module 125, and an antenna 126. The CPU 121, ROM 122, RAM 123, sensor unit 124, and wireless module 125 are connected to the internal bus 127.

  The CPU 121 controls the operation of each unit of the sensor terminal 120. The ROM 122 stores control software. The RAM 123 constitutes a work area for the CPU 121. The CPU 121 develops the software read from the ROM 122 on the RAM 123 to activate the software, and controls each unit of the sensor terminal 120. The sensor unit 124 includes a sensor element such as a camera, infrared rays, vibration, gas, smoke / heat. The wireless module 125 performs wireless communication with the controller 101 and other sensor terminals through the antenna 126.

[Processing for sensor abnormality determination]
Next, processing of the sensor terminal 120 and the controller 101 for determining abnormality (destruction / stop, movement) of the sensor terminal will be described.

  First, processing of the sensor terminal 120 will be described. The flowchart of FIG. 4 shows the procedure of the control process of the CPU 121 of the sensor terminal 120 for determining the abnormality of the sensor terminal 120. In step ST1, the CPU 121 starts processing, and then proceeds to processing in step ST2. In step ST2, the CPU 121 determines whether it is a regular transmission timing. The CPU 121 determines the regular transmission timing based on a count value of a timer (not shown in FIG. 3).

  At the regular transmission timing, the CPU 121 controls the wireless module 125 to transmit a confirmation information request to the controller 101 and the other sensor terminals 120 in step ST3. On the other hand, when it is not the regular transmission timing, the CPU 121 determines whether or not it is information reception in step ST4. When the information is not received, the CPU 121 returns to step ST2. On the other hand, when the information is received, the CPU 121 proceeds to the process of step ST5.

  In the process of step ST5, the CPU 121 determines whether a confirmation information response corresponding to the above-described confirmation information request is received from the controller 101 or another sensor terminal 120. When the confirmation information response is received, the CPU 121 updates the adjacent table in step ST6, and then returns to the process of step ST2.

  FIG. 5 shows an example of the adjacency table generated by the sensor terminal 120. This example is an example when the sensor terminal 120 is the indoor sensor 102, and the other nodes are the controller 101, the indoor sensor 103, and the outdoor sensors 104 and 105. As shown in the figure, the adjacency table has information on communication possibility and estimated distance with other nodes.

  When receiving the confirmation information response as described above, the sensor terminal 120 updates the adjacency table on the assumption that there is a possibility of communication with the transmission source node of the confirmation information response. In addition, when receiving the confirmation information response as described above, the sensor terminal 120 obtains information on the estimated distance based on the received signal strength at the time of reception for the node that is the transmission source of the confirmation information response, Update the adjacency table.

  For example, the sensor terminal 120 has graph information indicating the correspondence between the S / N ratio and the distance as shown in FIG. 6 for each node, and determines the distance from the node that is the source of the confirmation information response. Estimated from this graph information. Note that the sensor terminal 120 may estimate the distance to another node using other methods.

  When the sensor terminal 120 updates the information on the communication possibility and the estimated distance in the adjacent table with the node that is the transmission source of the confirmation information response, the sensor terminal 120 also changes the update time.

  In the example of the adjacent table generated by the indoor sensor 102 shown in FIG. Communication with the controller 101 is possible, the estimated distance is 10 m, and the update time of the information is t2. Communication with the indoor sensor 103 is possible, the estimated distance is 5 m, and the update time of the information is t2. Communication with the outdoor sensor 104 is possible, the estimated distance is 5 m, and the update time of the information is t2. In addition, communication with the outdoor sensor 105 is impossible, the estimated distance is unknown, and the update time of the information is t2.

  Returning to the flowchart of FIG. 4, when the confirmation information response is not received in step ST5, the CPU 121 determines whether a sensor information acquisition request is received from the controller 101 in step ST7. When receiving the sensor information acquisition request, the CPU 121 controls the wireless module 105 to transmit a sensor information acquisition request response including the adjacent table to the controller 101 in step ST8. After the process in step ST8, the CPU 121 returns to the process in step ST2. In addition, when the sensor information acquisition request is not received in step ST7, the CPU 121 immediately returns to the process of step ST2.

  Next, processing of the controller 101 will be described. The flowchart of FIG. 7 shows the procedure of the control process of the CPU 111 of the controller 101 for determining the abnormality of the sensor terminal 120. CPU111 starts a process in step ST11, and moves to the process of step ST12 after that. In step ST12, the CPU 111 determines whether it is a regular transmission timing. The CPU 111 determines the regular transmission timing based on a count value of a timer (not shown in FIG. 2).

  When it is the regular transmission timing, the CPU 111 controls the wireless module 115 to transmit a sensor information acquisition request to the sensor terminal 120 in step ST13. On the other hand, when it is not the regular transmission timing, the CPU 111 determines whether or not it is information reception in step ST14. When the information is not received, the CPU 111 returns to step ST12. On the other hand, when the information is received, the CPU 111 proceeds to the process of step ST15.

  In step ST15, the CPU 111 determines whether or not a sensor information acquisition request response including an adjacent table corresponding to the sensor information acquisition request is received from the sensor terminal 120. When the sensor information acquisition request response is not received, the CPU 111 returns to the process of step ST12. On the other hand, when receiving the sensor information acquisition request response, the CPU 111 proceeds to the process of step ST16.

  In step ST16, the CPU 111 updates the integrated table based on the adjacent table included in the sensor information acquisition request response. FIG. 8 shows an example of the integration table generated by the controller 101. As shown in the figure, the integration table has information on the possibility of communication with other nodes and estimated distance for each node, and information on the last update time of the information.

  In the example of the integrated table shown in FIG. The controller 101 can communicate with the sensors 102, 103, 104, and 105, and the estimated distances are 5 m, 5 m, 10 m, and 15 m. The indoor sensor 102 can communicate with the controller 101 and the sensors 103 and 104, and the estimated distances are 5 m, 5 m, and 5 m. The indoor sensor 102 cannot communicate with the sensor 105 and the estimated distance is unknown. It is.

  The indoor sensor 103 can communicate with the controller 101 and the sensors 102, 104, and 105, and the estimated distances are 5 m, 5 m, 5 m, and 10 m. The outdoor sensor 104 can communicate with the controller 101 and the sensors 102, 103, and 105, and the estimated distances are 10 m, 5 m, 5 m, and 5 m. The outdoor sensor 105 can communicate with the controller 101 and the sensors 103 and 104, and the estimated distances are 15 m, 10 m, and 5 m, cannot communicate with the sensor 102, and the estimated distance is unknown. .

  Returning to FIG. 7, after the process of step ST16, the CPU 111 proceeds to the process of step ST17. In step ST17, the CPU 111 updates the past information table. This past information table has past information created based on the information held in the integrated table updated in the past in step ST16.

  FIG. 9 shows an example of a past information table generated by the controller 101. As shown in the figure, the past information table has information on the number of days for which continuous communication with other nodes is possible and the estimated distance for each node. Here, the continuous communicable days between the first node and the second node is referred to the information on the possibility of communication between the first node and the second node every time the integration table is updated. The number of consecutive days that can be communicated is obtained.

  The estimated distance between the first node and the second node is obtained by referring to information on the estimated distance between the first node and the second node every time the integration table is updated. It shows the average value of the estimated distance in the past fixed period. Here, in a wireless system without a license, since the wireless state is easily changed, it is desirable to use a weighted moving average or an exponential weighted moving average that increases the weighting of nearby time in units of several days.

  In the example of the past information table shown in FIG. The controller 101 can communicate with the sensors 102, 103, 104, and 105 continuously for 72 days, and the average estimated distance is 6 m, 5 m, 12 m, and 14 m. The indoor sensor 102 can communicate with the controller 101 and the sensors 103 and 104 continuously for 72 days, and the average value of the estimated distance is 6 m, 4 m, and 7 m. In this case, communication is impossible and the average estimated distance is unknown.

  In addition, the indoor sensor 103 is in a communicable state for 72 consecutive days with the controller 101 and the sensors 102, 104, and 105, and the average value of the estimated distance is 5 m, 4 m, 5 m, and 9 m. The outdoor sensor 104 is in a communicable state for 72 days with the controller 101 and the sensors 102, 103, and 105, and the average value of the estimated distance is 10 m, 7 m, 5 m, and 6 m. The outdoor sensor 105 can communicate with the controller 101 and the sensors 103 and 104 continuously for 72 days, and the average value of the estimated distance is 14 m, 9 m, and 6 m. The impossible state continues, and the average estimated distance is unknown.

  Returning to FIG. 7, in step ST <b> 17, the CPU 111 further compares the integrated table updated in step ST <b> 16 with the past information table updated as described above. In step ST18, the CPU 111 determines whether or not the sensor terminal 120 is abnormal (destroy / stop or move). When determining that any one of the plurality of sensor terminals 120 is abnormal, the CPU 111 controls the network interface 114 in step ST19 and notifies the centralized monitoring center 302 of the fact via the network 301. .

  CPU111 returns to the process of step ST12 after the process of step ST19. When determining in step ST18 that all of the plurality of sensor terminals 120 are not abnormal, the CPU 111 immediately returns to the process of step ST12.

  Here, an abnormality determination example of the sensor terminal 120 in the CPU 111 will be described. In a general security system, communication between the controller and the sensor terminal may be disabled, but it is difficult to determine whether the wireless communication is temporarily defective or the sensor terminal is destroyed / stopped. Further, in a general security system, even if the sensor terminal moves, communication between the controller and the sensor terminal is often possible, and it is difficult to determine the movement of the sensor terminal.

  In this embodiment, the CPU 111 determines not only the information on the possibility of communication between the controller 101 and the predetermined sensor terminal 120 but also the predetermined sensor terminal 120 when determining whether the predetermined sensor terminal 120 is destroyed or stopped. The determination is made using information on the possibility of communication between the terminal 120 and another sensor terminal 120. In other words, the controller 101 cannot communicate with the predetermined sensor terminal 120, and when the communication between the predetermined sensor terminal 120 and another sensor terminal 120 is impossible, It is determined that the sensor terminal 120 has been destroyed or stopped.

  Further, when determining the movement of the predetermined sensor terminal 120, the CPU 111 not only provides information on the estimated distance between the controller 101 and the predetermined sensor terminal 120, but also the predetermined sensor terminal 120 and another sensor terminal 120. Judgment is made using information on the estimated distance between the two. That is, when there are a predetermined number or more of estimated distances that exceed the threshold among a plurality of specified distances between the predetermined sensor terminal 120 and another node, the controller 101 determines that the predetermined sensor terminal 120 Judge that it has been moved.

  A first determination example will be described. FIG. 10 shows an integration table in the first determination example. FIG. 11 shows a past information table in the first determination example. By comparing these tables, the CPU 111 recognizes that the controller 101 has changed from the communicable state to the incommunicable state with the outdoor sensor 104. Further, the CPU 111 recognizes that the outdoor sensor 104 has changed from the communicable state to the incommunicable state with the indoor sensors 102 and 103 and the outdoor sensor 105 by comparing these tables. Therefore, the CPU 111 determines that the outdoor sensor 104 has not been temporarily disabled, but has been destroyed or stopped.

  Next, a second determination example will be described. FIG. 12 shows an integration table in the second determination example. FIG. 13 shows a past information table in the second determination example. By comparing these tables, the CPU 111 is an estimated distance between the controller 101, the indoor sensors 102 and 103, and the outdoor sensor 104, where the estimated distance changing beyond the threshold (in this embodiment, 5 m). There are a predetermined number (2 in this embodiment) or more. Therefore, the CPU 111 determines that the outdoor sensor 104 has been moved.

  Next, FIG. 14 illustrates a sequence example between the controller 111 and the sensor terminal 120 for determining the abnormality of the sensor terminal 120 described above. In this example, a case where a first sensor terminal 120a and a second sensor terminal 120b exist as the sensor terminal 120 will be described.

  The first sensor terminal 120a transmits a confirmation information request to the controller 101 and the second sensor terminal 120b (500). In response to this confirmation information request, the controller 101 and the second sensor terminal 120b transmit a confirmation information response (501). The first sensor terminal 120a that has received the confirmation information response from the controller 101 and the second sensor terminal 120b updates the adjacent table (502). In this case, the controller 101 and the second sensor terminal 120b do not transmit a confirmation information response to the first sensor terminal 120a when communication with the first sensor terminal 120a is impossible.

  The second sensor terminal 120b transmits a confirmation information request to the controller 101 and the first sensor terminal 120a (510). In response to the confirmation information request, the controller 101 and the first sensor terminal 120a transmit a confirmation information response (511). The second sensor terminal 120b that has received the confirmation information response from the controller 101 and the first sensor terminal 120a updates the adjacency table (512). In this case, the controller 101 and the first sensor terminal 120a do not transmit a confirmation information response to the second sensor terminal 120b when communication with the second sensor terminal 120b is impossible.

  Further, the controller 101 transmits a sensor information acquisition request to the first sensor terminal 120a and the second sensor terminal 120b (520, 530). In response to this sensor information acquisition request, the first sensor terminal 120a and the second sensor terminal 120b transmit a sensor information acquisition request response including an adjacent table to the controller 101 (521, 531). In this case, when the first sensor terminal 120a and the second sensor terminal 120b cannot communicate with the controller 101, the sensor information acquisition request response is not transmitted to the controller 101.

  The controller 101 that has received the sensor information acquisition request response including the adjacent table from the sensor terminals 120a and 120b updates the integrated table (540). Then, the controller 101 updates the past information table having past information created based on the information held in the past updated integrated table as the integrated table is updated (541). Further, the controller 101 compares the integrated table and the past information table (541), and determines whether the sensor terminals 120a and 120b are destroyed / stopped or moved based on the comparison result (542).

  When the controller 101 determines that at least one of the sensor terminals 120a and 120b has been destroyed / stopped or moved, the controller 101 notifies the central monitoring center 302 as an abnormality of the sensor terminal (550). . In response to this, the centralized monitoring center 302 transmits an abnormal alarm response to the controller 101 (551).

  As described above, in the security system 100 shown in FIG. 1, information on the possibility of communication with other nodes and further communication with other nodes are periodically sent from each sensor terminal 120 to the controller 101. An adjacency table with estimated distance information is sent. Therefore, in the controller 101, an abnormality (destruction / stop, movement) of the predetermined sensor terminal 120 is detected in addition to the information on the possibility of communication with the predetermined sensor terminal 120 and the estimated distance. It is possible to make a determination using information on the possibility of communication with the sensor terminal 120 and the estimated distance, and the accuracy can be improved.

<2. Modification>
In the above-described embodiment, an example of the security system 100 including the indoor sensors 102 and 103 and the outdoor sensors 104 and 105 in addition to the controller 101 is shown. However, the present invention is not limited to this embodiment with respect to the number of sensors, the ratio of the number of sensors arranged indoors and indoors, and the type of sensor.

  Further, in the above-described embodiment, when updating the integrated table, the controller 101 obtains information on communication possibility and estimated distance to each sensor terminal 120 based on the adjacent table from each sensor terminal 120. showed that. However, similarly to the sensor terminal 120, the controller 101 also transmits a confirmation information request to each sensor terminal 120, receives a confirmation information response from each sensor terminal 120, and communicates with each sensor terminal 120. You may make it acquire the information of distance.

  The present invention can more accurately determine an abnormality (destruction / stop, movement) of a wireless sensor terminal. For example, the wireless security system includes an outdoor sensor that is highly likely to be destroyed / stopped or moved by a Service-to-Self. Applicable to.

  DESCRIPTION OF SYMBOLS 100 ... Security system, 101 ... Controller, 102, 103 ... Indoor sensor, 104, 105 ... Outdoor sensor, 106 ... Wireless network, 111 ... CPU, 112 ... ROM, 113 ... RAM, 114 ... network interface, 115 ... wireless module, 116 ... antenna, 120 ... sensor terminal, 121 ... CPU, 122 ... ROM, 123 ... RAM , 124 ... sensor unit, 125 ... wireless module, 126 ... antenna, 301 ... network, 302 ... centralized monitoring center

Claims (9)

A sensor unit;
A first transmitter that wirelessly transmits sensor information of the sensor unit to the controller;
A second transmitter for periodically transmitting a confirmation information request to other nodes;
A first receiver that wirelessly receives a confirmation information response sent from the other node in response to the confirmation information request transmitted by the second transmitter;
Based on the confirmation information response received by the first receiving unit, an adjacent table updating unit that periodically updates at least an adjacent table having communication possibility information with the other nodes;
A second receiving unit for receiving a sensor information acquisition request sent from the controller;
In response to the sensor information acquisition request received by the second reception unit, a sensor terminal including a third transmission unit that wirelessly transmits the adjacent table to the controller as abnormality determination information. The sensor terminal according to claim 1, wherein the adjacent table further includes information on an estimated distance from the other node. The sensor terminal according to claim 2, wherein the adjacent table update unit obtains information on the estimated distance based on a received signal strength when the confirmation information response is received by the first receiving unit. A sensor unit;
An abnormality determination information transmission method for a sensor terminal comprising a transmission unit for wirelessly transmitting sensor information of the sensor unit to a controller,
A confirmation information transmission step of periodically transmitting a confirmation information request to other nodes by radio;
A confirmation information response reception step for wirelessly receiving a confirmation information response sent from the other node in response to the confirmation information request transmitted in the confirmation information transmission step;
Based on the confirmation information response received in the confirmation information response reception step, an adjacent table update step for periodically updating at least an adjacent table having communication possibility information with the other nodes;
A sensor information acquisition request receiving step for receiving a sensor information acquisition request sent from the controller;
In response to the sensor information acquisition request received in the sensor information acquisition request reception step, an abnormality determination information transmission method for a sensor terminal comprising an adjacent table transmission step for wirelessly transmitting the adjacent table to the controller as abnormality determination information. A first receiver that wirelessly receives sensor information sent from a plurality of sensor terminals;
A first transmitter that wirelessly transmits a sensor information acquisition request to the plurality of sensor terminals periodically;
In response to the sensor information acquisition request transmitted by the first transmission unit, the adjacent table having at least communication possibility information transmitted from the plurality of sensor terminals is received. A second receiving unit;
Based on the adjacent table of the plurality of sensor terminals received by the second receiving unit, an integrated table update periodically updating an integrated table having information on the possibility of communication with other nodes for each node. And
A past information table update unit for updating a past information table having past information created based on information held in the integrated table updated in the past by the integrated table update unit, as the integrated table is updated;
A controller comprising: a sensor abnormality determination unit that compares the integrated table updated by the integrated table update unit and the past information table updated by the past information table update unit, and determines whether the plurality of sensor terminals are destroyed or stopped. . The sensor abnormality determination unit is configured to perform communication between the predetermined sensor terminal when communication with the predetermined sensor terminal is impossible and communication between the predetermined sensor terminal and another sensor terminal is disabled. The controller according to claim 5, wherein the controller is determined to have been destroyed or stopped. The adjacency table received by the second receiving unit further includes information on an estimated distance from the other node,
The integrated table updated by the integrated table update unit further has information on the estimated distance between other nodes for each node,
The sensor abnormality determination unit compares the integrated table updated by the integrated table update unit with the past information table updated by the past information table update unit, and further determines the movement of the plurality of sensor terminals. Item 6. The controller according to item 5. The sensor abnormality determination unit moves the predetermined sensor terminal when there are a predetermined number or more of the estimated distances that exceed the threshold among a plurality of estimated distances between the predetermined sensor terminal and another node. The controller according to claim 7, wherein the controller is determined to be. A sensor abnormality determination method for a controller including a receiver that wirelessly receives sensor information sent from a plurality of sensor terminals,
A sensor information acquisition request transmitting step for periodically transmitting a sensor information acquisition request to the plurality of sensor terminals;
In response to the sensor information acquisition request transmitted in the sensor information acquisition request transmission step, an adjacency table having at least communication possibility information with other nodes sent from the plurality of sensor terminals is received. An adjacent table receiving step,
Integrated table update step for periodically updating an integrated table having information on the possibility of communication with other nodes for each node based on the adjacent table of the plurality of sensor terminals received in the adjacent table receiving step. When,
A past information table update step for updating a past information table having past information created based on information held by the integrated table updated in the past in the integrated table update step, as the integrated table is updated;
A controller having a sensor abnormality determination step that compares the integrated table updated in the integrated table update step with the past information table updated in the past information table update step and determines whether the plurality of sensor terminals are destroyed or stopped. Sensor abnormality judgment method.

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