JP2002008172A - Radio guard system and guard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio guard system capable of performing propagation check by radio signals used in the operation of the guard system such as a detection signal of a sensor and an equipment monitoring signal of a radio transmitter and a sensor and grasping that radio communication is unstable. SOLUTION: This radio guard system consists of the radio transmitter transmitting a frame number set according to a predetermined order per transmission of a radio signal to a guard device by adding it to the radio signal and the guard device judging the continuity of the frame numbers received from the radio transmitter and included in the radio signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security system for notifying a security center when a fire or an intruder is detected in a security object such as a house, an apartment or a building. The present invention relates to a wireless security system for transmitting to a security device.

[0002]

2. Description of the Related Art Conventionally, a wireless security system performs a radio signal propagation check so that a detection signal of an intruder sensor for detecting an intruder or a fire sensor for detecting a fire reaches a security device without fail. I have. For example, at the time of installation,
A radio signal for checking propagation from a radio transmitter that transmits the detection signal of each sensor to the security device (hereinafter, “check signal”
That. ) To confirm that the security device can receive this check signal.

Also, during operation of the security system, a check signal is periodically transmitted from the wireless transmitter, and whether or not the security device has not received the check signal within a predetermined time period determines whether or not the propagation status of the wireless signal is being transmitted. Checking. This is because the propagation state of the wireless signal changes due to a layout change in a security object, a facility that transmits radio waves around the installation location is constructed, or the like. Thereby, when detecting the state where the detection signal of the sensor cannot be received by the security device,
The security system is maintained in a proper state by immediately changing the installation location or changing to a wired connection.

[0004]

However, in the conventional wireless security system, a check signal is used. Therefore, if the check signal is frequently transmitted, the traffic increases as the number of wireless transmitters increases and the sensor increases. There is a possibility that transmission and reception of the detection signal will be hindered.

[0005] Further, when the transmission interval of the check signal is lengthened, there is another problem that the propagation failure is found out more slowly.

[0006] Further, in the propagation state of the radio signal between the radio transmitter 3 and the security device 1, there is a situation where the propagation situation becomes unstable, in addition to a situation where communication is not completely possible.
The conventional check signal provides information indicating that wireless communication has already been disabled, but has a problem in that it cannot indicate that wireless communication has become unstable.

Accordingly, an object of the present invention is to realize a wireless security system that performs a propagation check using a wireless signal used for operating a security system, such as a sensor detection signal, a wireless transmitter, and a sensor device monitoring signal. . It is another object of the present invention to realize a wireless security system capable of grasping that wireless communication is unstable.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, the present invention provides a radio transmitter for adding a frame number set in a predetermined order to a radio signal every time a radio signal is transmitted and transmitting the frame number to a security device. And a security device for determining the continuity of the frame numbers included in the wireless signal received from the wireless transmitter.

According to this configuration, a frame number is assigned to each radio signal transmitted from the radio transmitter. Then, the security device that has received the wireless signal confirms that the frame numbers of the received wireless signals are received by the security device in the order given, so that all the wireless signals transmitted by the wireless transmitter can be received. You can confirm that.

[0010] Further, the security device stores frame omission information when there is no continuity of the radio signal,
This makes it possible to confirm the propagation status and respond to it during maintenance and inspection of security objects.

Further, by transmitting the frame omission information to the security center via a communication line, the security center can know the deterioration of the situation of the security target as needed. Note that this frame omission information is, in principle, less urgent than detection information of an intruder sensor and the like, and is preferably added to other notification signals in consideration of communication costs and the like. However, when the number of missing frames is large, the security system is seriously affected. Therefore, it is preferable to immediately notify the security center as highly urgent information. More preferably, by including the number of missing frames as the frame missing information, it is possible to know the wireless propagation state in detail.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a security system to which the present invention is applied. In the security system, a security device 1 is installed in a security object A1, A2,... Such as a house, a condominium, a building, and the like.
It is connected to the.

The security object A1 includes an intrusion sensor for detecting an intruder from outside by opening and closing windows and doors, a disaster prevention sensor for detecting heat, smoke, gas leakage, and the like, and an internal sensor for detecting the presence of a person inside. Various sensors 2 such as sensors are appropriately installed. The sensor 2 includes a sensor that directly outputs a detection signal to the security device 1 that is wired, and a sensor that outputs the detection signal via the wireless transmitter 3.

The choice of wired / wireless is based on the size of the security target A,
It is appropriately determined in consideration of the type of the sensor 2, the installation location of the sensor 2, the appearance, and the like. A similar configuration is adopted for the other security targets A2.

First, the overall operation of the security system will be described. When the security target A1 is in the security set state, for example, it is assumed that the sensor 2 monitoring the open / closed state of the window detects the opening of the window. At this time, the sensor 2 transmits the detection signal as a wireless signal to the security device 1 via the connected wireless transmitter 3. Upon receiving the detection signal, the security device 1 sends an abnormality notification to the security center D via the telephone line C. At the security center D that has received the abnormality report, appropriate measures are taken, such as directing a guard to the security target A1 that has issued the abnormality report.

The sensor 2 transmits a detection signal to the security device 1 when detecting the opening / closing of a window or the like even in the security released state. However, if the security target A1 is in the security release state, the security device 1 determines that the security target A1 is an action of the user of the security target A1 and does not perform the abnormality notification even when receiving the window open / closed detection signal. However, when a detection signal, such as a fire sensor, which should not be detected by the sensor 2 in a normal state even if a user is received, the security center D is notified.

Next, the radio transmitter 3 will be described with reference to FIG. FIG. 3 shows a schematic block diagram of the wireless transmitter 3. The wireless transmitter 3 transmits an antenna 31 that transmits and receives a radio signal to and from the security device 1, a transmitting unit 32 that is connected to the antenna 31, a receiving unit 33 that is also connected to the antenna 31, and a sensor 2 that is wired. A wired sensor I / F 34 for inputting, a display unit 35 for displaying the detection state of the sensor 2, an address setting unit 36 for setting a predetermined address for each wireless transmitter 3, and a CPU for controlling these units (Central processing unit) ROM (ReadOnly Mem)
ory). The control unit 30 includes a RAM (Random Access Memory) and a power supply 37 that converts AC power into DC power and supplies the DC power to each unit. Note that a battery may be used as the power supply 37.

The wireless transmitter 3 transmits a detection signal, a status signal, and the like to the security device 1 as a wireless signal in response to a detection input from the connected sensor 2, a check signal from the security device 1, and the like. All the wireless signals transmitted from the wireless transmitter 3 include at least the address setting unit 36.
, And a frame number that is incremented each time transmission is performed. However, if the address code is a code that can identify the wireless transmitter 3,
The present invention is not limited to the setting method, and any code may be used. The frame number is set for each transmission frame by using a ring counter, circulating from 00 to 99, and sequentially incrementing the frame number. The setting of the frame number is not limited to this, and may be any setting as long as it is sequentially set in a predetermined order.

Although the present embodiment has been described using the wireless transmitter 3 having both functions of transmitting and receiving wireless signals, a wireless security system employing one-way communication does not have a wireless signal receiving function. Alternatively, a wireless transmitter having only a wireless transmission function may be used. In this specification, a device that can transmit at least a wireless signal regardless of the presence or absence of a reception function is called a wireless transmitter.

Next, the security device 1 will be described in detail with reference to FIG. FIG. 2 shows a conceptual block diagram of the security device 1. The security device 1 includes an antenna 11 for transmitting and receiving a wireless signal to and from the wireless transmitter 3, a transmitting unit 12 connected to the antenna 11, a receiving unit 13 also connected to the antenna 11, and a signal from the sensor 2 wired. A wire sensor I / F 14 for inputting, an operation unit 15 for performing a setting operation of a security mode, etc .; a reporting unit 16 connected to the telephone line C and transmitting an abnormal signal to the security center D; A display unit 17 for displaying the presence or absence of an abnormality and a CPU (Central Processing Unit) / ROM (ReadOn) for controlling these units.
The control unit 10 includes a ly Memory) and a RAM (Random Access Memory), and a power supply 18 that converts an AC power supply into a DC power supply and supplies the DC power to each unit.

Except for a reception frame management unit 4 to be described later in the control unit 10, means for realizing each function are generally used in a security device, and therefore detailed description is omitted. The control unit 10 includes a reception frame management unit 4 that manages a reception frame when a wireless signal is received. FIG. 4 is a diagram showing functional blocks of the reception frame management unit 4. In the figure, a reception frame management unit 4 manages a frame loss determination unit 41 that determines a loss of a frame received via the antenna 11 and the reception unit 13 and a frame number and the like for each wireless transmitter 3 of the received frame. A frame missing information storage means 43 for storing the number of missing frames, the time, etc., when the frame missing is detected by the frame missing determining means 41, and a timing for reporting the frame missing information. It comprises a frame missing information transmission timing determining means 44 for determining the frame missing information and a frame missing information setting means 45 for setting the frame missing information in the transmission buffer of the reporting unit 16 when reporting the frame missing information to the security device 1.

The received frame management table 42 stores, for each wireless transmitter 3 installed as shown in FIG. 5, a frame number, a reception time, a data content, etc., of the most recently received frame. The content is rewritten each time a wireless signal is received, and the frame information of the most recently received wireless signal is stored for each wireless transmitter 3.

The frame loss determining means 41 determines the presence or absence of a frame loss based on the determination flow shown in FIG. The missing frame determination will be described with reference to FIG. The frame loss determining means 41 constantly monitors whether or not a wireless signal has been received (step S61). Here, when the wireless signal is received, the frame number of the immediately preceding received frame stored in the received frame management table 42 is compared with the frame number of the received wireless signal (step S62). Specifically, based on the address number of the wireless transmitter 2 included in the received frame, the frame number of the wireless transmitter 2 stored in the received frame management table 42 is read. The read frame number is compared with the frame number of the received frame. For example, if the frame number of the currently received frame is “10” and the frame number stored in the received frame management table 42 is “9”, “10−9 = 1” is calculated. next,
It is determined whether or not the received frames are continuous (step S63). Specifically, if the operation result is "1", it is determined that the operation is continuous, and otherwise, it is determined that the operation is discontinuous. However, due to the use of the ring counter, in the calculation between the frame numbers “99” and “00”,
If it is "-99", it is determined to be continuous, otherwise it is determined to be discontinuous. If it is determined in step S63 that the frame is discontinuous, the address of the wireless transmitter 3, the number of lost frames, and the reception time are stored in the frame loss information storage unit 43. On the other hand, if they are continuous, it is determined that there is no missing frame, and the process ends without storing.

Here, the significance of the missing frame information will be described. The frame omission information is information indicating the status of wireless communication between the wireless transmitter 3 and the security device 1.
In the propagation state of the wireless signal between the wireless transmitter 3 and the security device 1, there is a situation where the propagation situation becomes unstable, in addition to a situation where communication is not completely possible. The conventional propagation check signal provides information indicating that wireless communication has already been disabled, but cannot indicate that wireless communication has become unstable. Therefore, frame loss information is stored as information indicating that wireless communication has become unstable.

Next, a process for transmitting frame missing information from the security device 1 to the security center D will be described with reference to FIG. When the missing frame information is stored in the missing frame information storage unit 43, the security device 1 determines whether a case to be reported to the security center D has occurred (step S71). For example, when the user of the security target A1 performs a security set operation from the operation unit 15 to go out, a security set signal indicating that the security target A1 is in the security set state is transmitted from the notification unit 16 to the telephone line C. To the security center D via the Internet. In addition, the notification case includes a release signal in the case of a security release operation, an abnormality notification signal when an abnormality is detected, a regular alarm signal for checking the state of the telephone line C, and the like.

In step S71, when a report case occurs, it is determined whether or not there is a free area in the transmission buffer in the report section 16 (step S72). That is, since a single notification signal from the security device 1 to the security center D is limited to a predetermined amount of data, a frame is generated when there is free space in the data amount used for the generated notification case. Missing information is to be transmitted.

Steps S71 and S72 give priority to other information because the frame loss information is less urgent for the operation of the security system than other notification cases. In addition,
By transmitting with the report signal of other report cases,
It is possible to reduce communication cost by reporting frame loss information with low urgency.

Also, in this example, the missing frame information is transmitted to the security center D in addition to other report cases, but the missing frame information may be transmitted alone. In this case, steps S71 and S72 will be omitted.

Further, if the frame loss information is not transmitted within a predetermined time after the frame loss information is stored and no other cases occur, the frame loss information may be transmitted to the security center D alone. Good. Alternatively, it may be transmitted in response to a request from the security center D. Or you may make it display on the display part 17 of the security device 1.

In step S62, the frame number of the received frame is compared with the frame number of the previously received frame, that is, the frame number is calculated, and the calculation result is equal to or more than a predetermined value (for example, 5 or more). In such a case, the frame dropout information may be transmitted alone from the reporting unit 16 to the security center D as emergency device abnormality information. Further, a plurality of the above calculation results are stored, and when the number of missing frames becomes a predetermined number or more, the missing frame information alone is used as emergency equipment abnormality information by the security center D.
It may be transmitted to.

Next, in step S72, when a free space in the transmission buffer is detected, the frame loss information storage section 43
Is set in the transmission buffer by the frame loss information setting means 45 (step S73). Then, the notifying unit 16 performs a notifying process to the security center D via the telephone line C (step S74), and the frame missing information storage unit 43
Is cleared (step S75).

When the security center D receives the frame omission information, it can know that the transmitted radio signal propagation condition in the transmitted security object A is unstable. This makes it possible to take appropriate measures such as performing a maintenance check on the transmitted security object A.

[0034]

As described in the embodiments of the present invention, according to the present invention, it is possible to check the propagation of radio signals necessary for the original operation of the wireless security system. It is less necessary to frequently use the check signal.

Further, the state of wireless communication between the wireless transmitter and the security device can be ascertained before falling into a communication disabled state, and the maintenance of the reliability of the wireless security system becomes easier.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a security system.

FIG. 2 is a diagram showing a schematic block of a security device.

FIG. 3 is a diagram showing a schematic block diagram of a wireless transmitter.

FIG. 4 is a diagram showing functional blocks of a received frame management unit.

FIG. 5 is a diagram showing a received frame management table.

FIG. 6 is a flowchart showing a determination method of a frame loss determination unit.

FIG. 7 is a flowchart illustrating a method of determining frame missing information transmission timing.

[Explanation of symbols]

 A1: Security target C: Telephone line D: Security center 1: Security device 2: Sensor 3: Wireless transmitter 4: Received frame management unit 41: Frame loss determination unit 42: Received frame management table 43: Frame loss information storage Means 44: Missing frame information transmission timing 45: Missing frame information setting means

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Claims (5)

[Claims] 1. A wireless transmitter for adding a frame number set in a predetermined order for each transmission of a wireless signal and transmitting the frame number to a security device, and a continuation of the frame number included in a wireless signal received from the wireless transmitter. And a security device for determining gender. 2. A security device used in the wireless security system according to claim 1, wherein said frame numbers included in wireless signals received one after another from the same wireless transmitter are compared, and said wireless signal is compared with said wireless signal. A security device comprising: a determination unit that determines continuity of the wireless signal; and a storage unit that stores missing frame information when the wireless signal is not continuous. 3. A notifying unit for transmitting a signal to a security center via a communication line, wherein said judging means calculates the number of dropped frames, and generates an abnormal signal if the calculated result is a predetermined number or more. The security device according to claim 2, which issues a notification. 4. A notifying unit for notifying a security center of a change in the status of a security target to a security center via a communication line, and information setting means for adding the frame omission information to a notification signal from the notifying unit. 4. The security according to claim 2, further comprising: transmission timing determination means for adding, to the communication signal, said information setting means when there is a vacancy in an information area in the notification signal when notifying a change in the state of the security object. apparatus. 5. The security device according to claim 2, wherein said determination means calculates the number of missing frames, and stores the number of missing frames in said storage means.