KR20120089046A - Wireless security device for reducing power consumption and avoiding interference, and Security method using the same - Google Patents

Abstract

PURPOSE: A wireless security device and a wireless security method using the same are provided to improve the reliability of sense data by avoiding interference. CONSTITUTION: A sensor(111) generates analog sense data by sensing invasion. A sensor control unit(112) receives the analog sense data and changes the analog sense data into digital sense data. A modem(113) modulates the digital sense data and transmits the digital sense data to a security controller. A power control unit(115) selectively blocks power which is provided to the modem according to the control of the sensor control unit.

Description

Wireless security device for reducing power consumption and avoiding interference {Wireless security device for reducing power consumption and avoiding interference, and Security method using the same}

The present invention relates to a wireless security device and a security method using the same, and more particularly, to a wireless security device that can reduce power consumption and avoid interference, and a wireless security method using the same.

In the conventional security technology, (1) a method of detecting an intrusion through wireless communication between the sensor and the landline telephone and sending an alert to a designated place by phone or SMS using the Internet network and the telephone network (Public Patent No. 2002-0008593) (2002.01.31)), (2) The wired telephone itself has a built-in camera, speaker, microphone, and human body sensor, so if a movement is detected through the camera or the human body sensor, an alarm is sent to the designated place by phone or SMS and the administrator To allow a user to talk to an intruder using a speakerphone (Patent No. 2004-0073909 (2004.08.21)), (3) A method for detecting a movement using a camera of a mobile phone (Patent No. 2004-0084517 (2004.10) .06)), and (4) make a warning by dialing the designated phone number in case of emergency by using a telephone and remote control equipped with a human body sensor and a fire sensor, and make basic settings on the body of the telephone. There are many ways to do this, including how to make changes.

As shown in the above methods, a sensor (human detection sensor, etc.) for detecting an intrusion may be embedded in the phone, but wireless may be used to detect the intrusion in various places (eg, windows, doors, etc.). Sensors are mainly used.

Since these wireless sensors are mainly powered by batteries, there is an urgent need to reduce power consumption. In addition, since the wireless sensor transmits sensed data wirelessly, it is vulnerable to interference occurring within a frequency band used. Therefore, in order to improve the reliability of sensed data, a method of avoiding radio interference is also urgently required.

An object of the present invention is to provide a wireless sensor device that can reduce power consumption and a security method using the same.

Another object of the present invention is to provide a security controller device and a security method using the same, which can improve the reliability of sensed data by avoiding radio interference.

According to an aspect of the present invention, there is provided a wireless sensor device, including: a sensor configured to detect analogue intrusion and generate analog sensing data; A sensor controller configured to receive the analog sense data and convert the analog sense data into digital sense data; A modem for modulating the digital sensed data and transmitting the modulated data to a security controller in a predetermined wireless communication scheme; And a power control unit for selectively blocking power supplied to the modem under the control of the sensor control unit.

The sensor control unit controls the power control unit to supply power to the modem when the analog sensing data is generated, and controls the power control unit to supply power to the modem while the analog sensing data is not generated. Supply can be cut off.

The modem receives a synchronization signal transmitted from the security controller, checks a state of the security controller using the synchronization signal, and transmits the sensed data to the security controller when the synchronization signal includes a guard state. If the synchronization signal includes a release state, the sensing data may not be transmitted to the security controller.

Security controller device according to an embodiment of the present invention for achieving the technical problem is a modem for wirelessly receiving the sensing data from the wireless sensor device; A sensor data processor configured to receive the sensed data from the modem and analyze the sensed data, wherein the modem selects good frequency channels among a plurality of divided frequency channels in a predetermined frequency band to construct a frequency hopping table; Change the frequency channel according to the frequency hopping table.

The modem may measure the received signal strength for each of the plurality of divided frequency channels one or more times, and select the good frequency channels according to the measured received signal strength.

According to an aspect of the present invention, there is provided a wireless security method, comprising: configuring a frequency hopping table by searching for a plurality of divided frequency channels in a predetermined frequency band by selecting a good frequency channel; Changing, by the security controller, a frequency channel according to the frequency hopping table; And transmitting a signal to a wireless sensor through the changed frequency channel.

The signal may include a synchronization signal indicating a state of the security controller, and the wireless security method may further include the wireless sensor receiving the synchronization signal and confirming a state of the security controller.

The wireless security method includes: detecting whether the wireless sensor is invasive and generating detection data; And transmitting the sensed data to the security controller if the sync signal includes a guard state, and not transmitting the sensed data to the security controller if the sync signal includes a released state. .

The wireless sensor according to the present invention supplies power to the modem only when it detects an intrusion, that is, when there is sensing data to be transmitted to the security controller, and cuts off the power supply to the modem while there is no sensing data to be transmitted to the security controller. This can reduce power consumption.

In addition, the security controller according to the present invention, by selecting only good frequency channels (for example, unused frequency channels) of the plurality of frequency channels in the use frequency band and radio interference by changing the channel used among the selected frequency channels Can be avoided. Accordingly, the probability of error of the sensed data transmitted over the air is reduced, thereby improving reliability.

1 is a block diagram of a wireless security system according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of the hot wire wireless sensor shown in FIG. 1.
3 is a functional block diagram of the magnet wireless sensor shown in FIG. 1.
4A is a flowchart illustrating a security method using a wireless security sensor according to an embodiment of the present invention.
4B is a view for explaining a security method using a wireless security sensor according to an embodiment of the present invention.
5 is a view for explaining a radio frequency band used by a wireless security system according to an embodiment of the present invention.
The frequency hopping table shown in FIG. 6 may be configured and used.
8 is a flowchart illustrating a method of operating a security controller according to an embodiment of the present invention.
9 is a flowchart illustrating a method of configuring a frequency hopping table according to an embodiment of the present invention in more detail.
10 is a table for explaining a method of configuring a frequency hopping table according to an embodiment of the present invention.

Specific structural to functional descriptions of the embodiments of the present invention disclosed in the specification or the application are only illustrated for the purpose of describing the embodiments according to the present invention, and the embodiments according to the present invention may be embodied in various forms. It should not be construed as limited to the embodiments described in this specification or the application.

The embodiments according to the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in this specification or application. It is to be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms of disclosure, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first and / or second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are intended to distinguish one element from another, for example, without departing from the scope of the invention in accordance with the concepts of the present invention, the first element may be termed the second element, The second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprises ", or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as meaning consistent with meaning in the context of the relevant art and are not to be construed as ideal or overly formal in meaning unless expressly defined herein .

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a block diagram of a wireless security system 100 according to an embodiment of the present invention. FIG. 2 is a functional block diagram of the hot wire wireless sensor 110 shown in FIG. 1, and FIG. 3 is a functional block diagram of the magnet wireless sensor 120 shown in FIG.

1 to 3, the wireless security system 100 includes a security controller 130 and a plurality of wireless security sensors 110 and 120. Wireless security sensors fall into two broad categories. One is a hot wire wireless sensor 110 and the other is a magnet wireless sensor 120.

The hot wire wireless sensor 110 plays a role of informing a wireless state of intrusion of a person. Referring to FIG. 2, the hot wire wireless sensor 110 includes a hot wire sensor 111, a sensor controller 112, a modem 113, a battery 114, and a power controller 115. The hot wire sensor 111 detects human body heat and sends analog sensing data to the sensor controller 112. The sensor controller 112 converts analog sense data received from the hot wire sensor 111 into digital data and transmits the digital data to the modem 113. The modem 113 is a picocast modem, and modulates the sensed data converted into digital data into a picocast signal and transmits it to the security controller 130 in a wireless communication method.

The power control unit 115 controls the power delivered to the modem 113. More specifically, the power control unit 115 is located between the battery 114 and the modem 113, the power supplied from the battery 114 to the modem 113 in response to the control signal of the sensor control unit 112. Selectively block For example, the power control unit 115 does not supply power to the modem 113 when there is no sensing data to be transmitted wirelessly. That is, power supply to the modem 113 is interrupted. When the human body is detected by the hot wire sensor 111, the sensor controller 112 supplies power to the modem 113 by using the power controller 115. After power is supplied to the modem 113, the sensor controller 112 transmits the sensed data to the modem 113, and after the sensor 113 wirelessly transmits the sensed data to the security controller 130, the sensor The control unit 112 cuts off the power of the modem 113 again using the power control unit 115.

The magnet wireless sensor 120 is mounted on the door or window and detects the state of the door open or closed to wirelessly inform.

To this end, as shown in FIG. 3, the magnet wireless sensor 120 includes a magnet sensor 121, a sensor controller 122, a modem 123, a battery 124, and a power controller 125. The magnet sensor 121 detects an open or closed state of a door or a window and sends analog sensing data to the sensor controller 122. The sensor controller 122 converts analog sense data received from the magnetic sensor 121 into digital data and transmits the digital data to the modem 123. The modem 123 is a picocast modem, and modulates the sensed data converted into digital data into a picocast signal and transmits the data to the security controller 130 in a wireless communication method.

The power control unit 215 controls the power transmitted to the modem 213 similar to the power control unit 115 of the hot wire wireless sensor 110. More specifically, the power control unit 215 is located between the battery 214 and the modem 213, the power supplied from the battery 214 to the modem 213 in response to a control signal of the sensor control unit 212. Selectively block For example, the power controller 215 does not supply power to the modem 213 when there is no sensing data to be transmitted wirelessly. That is, power supply to the modem 113 is interrupted. For example, when an opening of a door is detected by the magnet sensor 211, the sensor controller 212 supplies power to the modem 213 using the power controller 215, so that the sensed data is transmitted to the security controller through the modem 213. After being transmitted to 130, the sensor controller 212 cuts off the power of the modem 213 again using the power controller 215.

The security controller 130 receives sensing data transmitted from the wireless security sensors 110 and 120 through wireless communication, determines whether an intrusion is performed using the received sensing data, and controls the control server through the communication network 140 ( 150, tell the facts of the intrusion.

The communication network 140 may be a wireless communication network, a wired communication network, or a communication network in which these are combined. The control server 150 analyzes and stores the sensed data received from the plurality of security controllers 130 through the communication network 140 and may notify the manager if necessary.

The control server 150 may be implemented as a web server. The security controller 130 may be installed in a home, an office, a building, and the like, and the wireless security sensors 110 and 120 may be installed in a home, an office, a door, a window, or the like where the security controller 130 is installed. have.

The security controller 130 includes a modem 131 and a sensor data processor 133.

The modem 131 wirelessly communicates with the modems 113 and 213 of the wireless security sensors 110 and 120, receives the sensed data transmitted from the wireless security sensors 110 and 120, and transmits the sensed data to the sensor data processing unit 133. . The sensor data processor 133 determines whether an intrusion is made using the sensed data.

4A is a flowchart illustrating a security method using a wireless security sensor according to an embodiment of the present invention. 4B is a view for explaining a security method using a wireless security sensor according to an embodiment of the present invention.

Referring to this, the security controller 130 periodically transmits a synchronization signal to the wireless sensors 110 and 120 (S110 and S120). At this time, the security controller 130 loads its state (expense or release) to the synchronization signal. Here, the release state means a state in which the guard is released. In the released state, even though sensor data is sensed in the wireless sensors 110 and 120, the sensed data is not transmitted to the security controller 130.

When the wireless security sensors 110 and 120 detect data using the hot wire sensor 111 or the magnetic sensor 211 (S130), the modems 113 and 213 of the wireless security sensors 110 and 120 may use a security controller ( In order to transmit the sensed data to the 130, it synchronizes with a synchronization signal sent from the security controller 130. However, in the embodiment of FIG. 4, after sensing data at the wireless sensors 110 and 120 (S130), the state of the synchronization signal received from the security controller 130 is also in a released state (S140). Therefore, the wireless sensors 110 and 120 do not transmit the sensing data to the security controller 130.

If the wireless security sensor 110, 120 detects the sensor data (S150), and the state of the synchronization signal received from the security controller 130 is a guard state (S160), the wireless sensor (110, 120) is finally detected. The data is transmitted to the security controller 130 (S170). That is, the wireless sensors 110 and 120 check the state of the security controller 130 using the synchronization signal periodically transmitted from the security controller 130 before transmitting the detection data, and then detect the detection data only in the case of the guard state. Transmission to the security controller 130 (S170).

As described above, according to the embodiment of the present invention, only when the security controller 130 is in a guard state, the wireless sensors 110 and 120 transmit sensing data, thereby reducing power consumption by reducing unnecessary transmission times. .

5 is a view for explaining a radio frequency band used by a wireless security system according to an embodiment of the present invention. Referring to this, the wireless sensors 110 and 120 and the security controller 130 according to the embodiment of the present invention divide the 2.4 GHz frequency band (B1, for example, 2400 MHz to 2480 MHz) into 80 channels. The frequency bandwidth of each channel is 1 MHz. That is, the frequency band B1 of 2400 MHz to 2480 MHz is divided into 80 channels having a 1 MHz bandwidth.

The 2.4 GHz frequency band B1 is an unlicensed frequency band, which is commonly used by Wi-Fi, Zigbee, Bluetooth, and the like. For example, the B2 frequency band of the 2.4 GHz frequency band B1 may be used by Wi-Fi, and the B3 frequency band may be used by Zigbee. Accordingly, the security controller 130 according to an embodiment of the present invention may search for and use a frequency region not currently used in the 2.4 GHz frequency band B1 in order to reduce interference due to the frequency region currently being used.

To this end, the security controller 130 may configure and use the frequency hopping table shown in FIG. 6. The frequency hopping table includes a plurality of frequency channel lists. As shown in FIG. 5, each frequency channel may be a frequency channel selected from a total of 80 frequency channels from frequency 0 channel to frequency 79 channel.

7 is a flowchart illustrating a wireless security method according to an embodiment of the present invention. Referring to this, the security controller transmits a synchronization signal indicating the guard state to the wireless sensors (S310). The wireless sensors 110 and 120 detect whether or not an invasion is detected in a security area of the wireless sensor 110 by detecting human body heat or opening a door. When such sensing data is generated and the synchronization signal is in a guard state, the wireless sensors 110 and 120 transmit the sensing data to the security controller 130 (S320).

When the security controller 130 normally receives the detection data from the wireless sensors 110 and 120 without error, the security controller 130 transmits an ACK signal to the wireless sensors 110 and 120 (S360). However, when the security controller 130 does not normally receive the sensing data from the wireless sensors 110 and 120 or an error occurs, the security controller 130 transmits a NACK signal to the wireless sensors 110 and 120 (S330). ). Then, the wireless sensors 110 and 120 retransmit the sensing data to the security controller 130 (S340).

 After the wireless sensors 110 and 120 transmit the sensing data to the security controller 130 (S340), if the wireless sensor 110 or 120 does not receive an ACK signal for a predetermined time (that is, when timed out), the wireless sensors 110 and 120 are secure controllers. In step 130, the sensing data is retransmitted (S350).

When the security controller 130 receives the sensing data from the wireless sensors 110 and 120, the security controller 130 transmits an ACK signal to the wireless sensors 110 and 120 (S360).

8 is a flowchart illustrating a method of operating the security controller 130 according to an embodiment of the present invention. Referring to this, the security controller 130 configures a frequency hopping table by selecting a plurality (eg, 16) of good frequency channels (eg, unused frequency channels) of the 2.4 GHz frequency band B1 (S210). ). Then, the security controller 130 may change the frequency channel according to the order of the frequency hopping table each time the signal is transmitted and received to the wireless sensor (110, 120) (S220).

9 is a flowchart illustrating a method of configuring a frequency hopping table according to an embodiment of the present invention in more detail. 10 is a table for explaining a method of configuring a frequency hopping table according to an embodiment of the present invention.

Referring to this, the security controller 130 measures a received signal strength indicator (RSSI) for each of 80 frequency channels in the 2.4 GHz frequency band B1 (S211). At this time, the received signal strength measurement of each frequency channel is performed a plurality of times (two or more), the average received signal strength can be obtained.

The T1 table of FIG. 10 shows RSSI values measured for each frequency channel. After measuring the RSSI value for each frequency channel as described above, the security controller 130 may arrange the frequency channels in the order of decreasing average received signal strength (S212). Of course, the frequency channels may be arranged in the order of increasing average received signal strength, or the frequency channels may be selected in the order of decreasing average received signal strength without separate alignment. The T2 table of FIG. 10 shows a case where frequency channels are arranged in order of decreasing average received signal strength.

Next, the security controller 130 selects a plurality of hopping frequency channels (eg, 16) in order of decreasing average received signal strength (S213) and stores them in a frequency hopping table (S214). In this case, the channel order of the frequency hopping table need not be an order of decreasing average received signal strength or an order of increasing average received signal strength.

Preferably, the channel order of the frequency hopping table is preferably determined in a direction in which the frequency interval is maintained at a predetermined level or more in consideration of adjacent frequency interference.

Although the contents of the present invention have been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it should be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. will be. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Wireless security system 100, security controller 130,
Hot wire wireless sensor 110, magnetic wireless sensor 120,
Hot wire sensor 111, sensor control unit 112, 212,
Modem (113, 213, 131), Battery (114, 214)
Power control unit 115 and 215, sensor data processing unit 133,
Communication network 140, control server 150

Claims (14)

A sensor for detecting an intrusion and generating analog sense data;
A sensor controller configured to receive the analog sense data and convert the analog sense data into digital sense data;
A modem for modulating the digital sensed data and transmitting the modulated data to a security controller in a predetermined wireless communication scheme; And
And a power control unit for selectively blocking power supplied to the modem under the control of the sensor control unit. The method of claim 1, wherein the sensor control unit
When the analog sense data is generated, the power control unit is controlled to supply power to the modem,
While the analog sense data is not generated, the wireless sensor device to control the power control unit to cut off the power supply to the modem. The method of claim 1, wherein the modem
Receiving a synchronization signal transmitted from the security controller,
And confirming a state of the security controller using the synchronization signal. The method of claim 3, wherein the modem
And transmitting the sensed data to the security controller when the synchronization signal includes a security state, and not transmitting the sensed data to the security controller when the synchronization signal includes a release state. The method of claim 1, wherein the modem
And after transmitting the digital sensing data to the security controller, if the NACK signal is received from the security controller or the ACK signal is not received for a predetermined time, the digital sensing data is retransmitted to the security controller. A modem for wirelessly receiving sensing data from a wireless sensor device;
A sensor data processor configured to receive the sensed data from the modem and analyze the sensed data;
The modem
Configure a frequency hopping table by selecting good frequency channels among a plurality of frequency channels divided in a predetermined frequency band,
And changing a frequency channel according to the frequency hopping table. The method of claim 6, wherein the modem
And receiving at least one received signal strength for each of the plurality of divided frequency channels, and selecting the good frequency channels according to the measured received signal strength. The method of claim 7, wherein
The predetermined frequency band is a 2.4 GHz band,
And said good frequency channels are frequency channels with low measured received signal strength. The method of claim 6,
And the modem periodically transmits a synchronization signal including a state of the wireless controller device to the wireless sensor device to the wireless sensor device. 10. The method of claim 9,
When the state of the wireless controller device is in a synchronous state, receiving the sensed data from the wireless sensor device,
And when the state of the wireless controller device is in a released state, do not receive the sensed data from the wireless sensor device. Configuring, by the security controller, a frequency hopping table by searching for a plurality of divided frequency channels in a predetermined frequency band and selecting good frequency channels;
Changing, by the security controller, a frequency channel according to the frequency hopping table; And
Transmitting a signal to a wireless sensor over the changed frequency channel. The method of claim 11,
The signal includes a synchronization signal indicative of a state of the security controller,
The wireless security method
Receiving, by the wireless sensor, the synchronization signal and confirming a state of the security controller. The method of claim 12, wherein the wireless security method
Detecting whether the wireless sensor is invasive and generating detection data; And
And transmitting the sensed data to the security controller when the sync signal includes a guard state, and not transmitting the sensed data to the security controller when the sync signal includes a released state. Wireless security method. The method of claim 13, wherein the wireless security method is
The security controller transmitting an ACK signal to the wireless sensor when the sensing data is normally received from the wireless sensor; And
The wireless sensor may further include retransmitting the sensed data to the security controller when the wireless sensor does not receive the ACK signal from the security controller for a predetermined time or receives a NACK signal from the security controller. .

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