KR100964179B1 - A moving-state sensing device waking up and sending signal periodically and a usn-based facilities and assets management system adjusting the sending periods - Google Patents

Abstract

PURPOSE: A moving-state sensing device waking up and sending a signal periodically and a USN-based facilities and an assets management system adjusting the sending periods are provided to perform transmission the state detection device and maintain sleep mode of the state detection device for rest of time thereby reducing use amount of a battery. CONSTITUTION: A control unit(36) changes transmission period of a counter(31) according to movement sensing state. If the movement is not detected to the movement sensing unit, the control unit increases the transmission period in proportion to movement non-sensing time. The control unit initializes the transmission period of the counter to minimum transmission period. When a movement is not sensed as much as sensing update standard frequency, the control unit is increased in proportion to the transmission period according to progressive ratio.

Description

A moving-state sensing device waking up and sending signal periodically and a USN-based facilities and assets management system adjusting the sending periods}

The present invention relates to a state sensing device mounted on an article to send article state information about the article to a server, and a USN-based asset management system that grasps the state and location of an asset (or article) based thereon.

Particularly, the present invention provides a state sensing device for transmitting the article state information at regular intervals and maintaining a sleep mode for the rest of the time, and increases the delivery period of the state sensing apparatus of the article if the article does not move for a long time. It relates to an asset management system.

In general, Radio Frequency Sensing is a technology that recognizes and processes state information of a thing using a small semiconductor chip, and attaches a small wireless state sensing device to various items to transmit and process information of the object and surrounding environment information at a radio frequency. Contactless recognition system.

The Ubiquitous sensor network (USN), which consists of a wireless receiving reader with wireless signal reading and decoding, and a radio sensor (RF sensor) with built-in information, operating software, and a network, is a thin flat surface attached to an object. The information is processed by identifying a wireless sensing device.

These USNs do not need to be in direct contact or scanning in the visible band as a bar code. Because of these advantages, it is evaluated as a technology to replace the bar code, and the scope of application is expanding. Low frequency band radio frequency identification systems (30 kHz to 500 kHz) are used at short distances up to 1.8 m and high frequency band electronic identification systems (850 MHz to 950 MHz or 2.4 GHz to 2.5 GHz) are transmitted over long distances of 27 m or more. This is possible. In other words, USN is a system that processes the data by recognizing the information of the wireless state detection sensor within a few tens of meters by connecting the antenna to the wireless signal reader.

Techniques for managing in real time by the status sensor using the USN has been proposed. This technology makes it easy to determine the presence or location of an article by installing a wireless sensing device that senses information about the article and reading this information. That is, if the USN technology that can include a variety of information in the sensing device for sensing the state of the article can be usefully manage the article according to the user's convenience, USN technology is used a lot in article management.

As described above, an example of a technology for managing an article using a wireless sensor network is disclosed in [Republic of Korea Patent Publication 10-2009-0023008 (2009.03.04.), "Container Monitoring System and Smart Container Device Using a Wireless Sensor Network"] (Hereinafter referred to as prior art 1).

The prior art 1 is connected to a plurality of sensor modules for sensing the internal environment of the container and a wireless sensor network, and monitors the internal condition of the container such as the positional deviation and breakage of the stored items in the container, mounted inside the container and the internal state of the container A sensor module for detecting a signal and delivering the detected result to a smart container device connected to a wireless sensor network; Container environment including the location data, the internal status data and the container identification number through wireless internet or mobile communication network or satellite communication network after storing the internal state data received from the sensor module in the internal memory. Smart container device for transmitting data to the server side; And a monitoring server configured to monitor an internal state of the container based on container position data and environment data received from the smart container device.

However, the prior art 1 is mounted on the inner wall of the container, etc. without directly attaching the sensor module (or state sensing device) to the article. In general, RFID tag technology is used to directly attach to an article to identify the article and obtain status information of the article. The RFID tag is a passive type and does not have a direct power source (or battery), and operates with an RF signal transmitted by an external RFID reader as a power source.

Therefore, in order to directly attach the sensor module (or state sensing device) to the article to be used for article management, the battery problem of the state sensing apparatus should be solved. If the asset management through the wireless sensor, all the assets are attached to the wireless sensor to replace the battery requires a lot of time and money.

An example of a technique for striking a battery of a sensor in a wireless sensor network is disclosed in [Republic of Korea Patent Publication 10-2007-0092073 (Dec. 12, 2007), "Power saving method of a wireless sensor network"] (hereinafter referred to as prior art 2). It is.

The prior art 2 is a method for saving battery power of a wireless communication device by operating a sleep mode for minimizing power consumption other than an active mode for communication, comprising: initializing a sleep probability when the device is initially placed; Activating the active mode for communication, starting an active mode timer, if there are no packets to be sent or received before the active mode timer expires, activating the sleep mode and releasing the sleep mode based on the sleep probability. Disclosed is a method comprising the step of determining.

However, the prior art 2 is a battery saving method in the sensor network for transmitting the sensed data, it is difficult to apply mainly to the sensor network for asset management to detect the position or movement. Therefore, the battery management technology of the state sensor suitable for the wireless sensor network (USN) for asset management is urgently needed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a state sensing apparatus mounted on an article and sending the state information of the article to a server, and a USN-based asset management system that grasps the state and location of an asset (or article) based on the same.

Particularly, an object of the present invention is a state sensing device for transmitting the state information of goods on a regular basis and remaining in a sleep mode for the rest of the time, and a delivery cycle of the state sensing device of the article if the goods do not move for a long time. It is to provide an asset management system that increases.

In order to achieve the above object, the present invention relates to a state sensing device mounted on an article to send the article status information for the article to the server, the communication unit for sending the article status information; A control unit which is operated by a received on-signal to transmit stored article state information through the communication unit and to switch the communication unit and itself into a sleep mode; And a counter for counting a discharging period and transmitting an on signal to the controller when the count is completed.

In addition, the present invention is a state sensing device, the control unit, characterized in that it further comprises a movement detecting unit for transmitting an (on) signal to the control unit when the movement is detected.

In addition, the present invention is a state sensing device, the control unit is characterized in that for changing the delivery cycle of the counter according to the movement detection state.

In another aspect, the present invention, in the state detection device, if the movement is not detected by the movement detecting unit, the control unit increases the transmission period of the counter in proportion to the time duration of the state is not detected movement do.
In the present invention, in the state detection device, the control unit initializes the dispensing cycle of the counter to the minimum dispensing cycle, and detects as many times as the update reference number of the discharging cycle, when the movement is not detected, increase the discharging cycle according to the increase rate When the movement is detected, the transmission cycle is initialized to the minimum transmission cycle.

In addition, the present invention is a state detection device, the state detection device, the control unit, a counter, a main body having a built-in communication unit, and if it is detected that the main body is damaged damage detection for transmitting an (on) signal to the control unit It further comprises a wealth.

The present invention also relates to a USN-based asset management system, comprising: a state sensing device that periodically transmits and stores article state information that is on and stored in an RF signal and switches to a sleep mode according to a delivery cycle; A server for receiving the RF signal from the state sensing device to determine the location information of the asset to which the state sensing device is attached; And a receiving device for relaying communication between the state sensing device and the server.

In addition, the present invention is characterized in that in the USN-based asset management system, the state detection device increases the transmission period in proportion to the time the movement or damage is not detected if the movement or damage is not detected .

As described above, according to the state sensing device and the USN-based asset management system according to the present invention, by operating only during the transmission cycle intervals and the remaining time is maintained in the sleep (sleep) mode, to reduce the use of the battery to replace the battery The effect of reducing the work is obtained.

In addition, according to the state detection device and USN-based asset management system according to the present invention, by identifying the position of the state detection device attached to the asset, if there is no motion to send a longer transmission period and to send only when the movement is sensed, The effect of more effective location management of assets with little movement is obtained.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

In addition, in describing this invention, the same code | symbol is attached | subjected and the repeated description is abbreviate | omitted.

First, the configuration of the USN-based asset management system according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the USN-based asset management system includes a state sensing device 30, a receiving device 40, and a server 50.

The state sensing device 30 is attached to the inside or outside of an item (or asset) to be carried or managed by an individual, detects the movement of a managed object and the existence of a certain area, and receives the detection result through wireless data communication. ) Outgoing device.

The state sensing device 30 is a sensor module (or sensing device) in the wireless sensor network USN. That is, the state sensing device 30 itself has an energy source such as a battery, and itself voluntarily reads or detects state information of the article and transmits it wirelessly.

The state sensing device 30 is a wireless movement sensor attached to an article or asset 20 such as a machine, equipment, or table, and may be carried by an operator or the like. For example, a worker's access ID card or the like can be implemented as the state detection device 30.

The state sensing device 30 actively transmits state information, but can only transmit state information when a certain situation occurs. There are two types of transmission. First, RF signals are sent at periodic intervals according to a certain period. Second, the state sensing device 30 transmits an RF signal when a specific situation occurs.

As an example of random transmission, the RF signal is transmitted when the state sensing device 30 is moving or moving. In addition, it may also be the case that the state detection device 30 is broken. In addition, if the capacity of the battery can be measured, the RF signal can be sent when a situation is low.

The state sensing device 30 enters a sleep mode unless it transmits the article state information. In the sleep mode, the state sensing device 30 stops most functions and activates only essential functions such as a counter function. In particular, the high power consumption of the RF communication is stopped. In other words, the sleep mode is a low power mode.

In the first case described above, the state sensing device 30 periodically transmits the stored state information of the article as an RF signal and switches back to the sleep mode. At this time, a cycle in which the signal is turned on is called a transmission cycle.

The delivery cycle may be predetermined in advance. That is, when the state sensing device 30 is installed, the transmission period may be set to an initial value. The state sensing device 30 may update the discharging cycle by itself according to the movement detection state of the attached article.

The receiving device 40 relays the communication between the state sensing device 30 and the server 50. The article state information wirelessly transmitted by the state sensing device 30 is received by the receiving device 40. The receiving device 40 serves as an RFID reader.

As shown in FIG. 1, a plurality of receivers 40 may be installed in a space 10 in which an asset is located. For example, three receivers A, B, and C are installed. When the RF signal is transmitted from the state sensing device 30, the receivers A, B, and C receive the RF signal and transmit the RF signal to the server 50. Each receiver A, B, C also detects the strength of the RF signal and transmits it to the server 50.

The receiving device 40 and the server 50 are preferably connected by wired communication. In addition, the receiver 40 and the server 50 may be connected to the communication in a wireless manner.

The server 50 is connected in communication with all the receiving apparatus 40, and receives the RF signal and signal strength detected by the receiving apparatus 40. On the other hand, the server 50 receives the position of each receiver 40 in advance and stores it. Therefore, the server 50 calculates the position of the state detection device 30 by a triangulation method using the signal strength of the state detection device 30 detected by each receiver 40.

For example, as shown in FIG. 1, the server 50 calculates the position of the state sensing device 30 by triangulation from the intensity of the RF signal of the state sensing device 30 measured by the receivers A, B, and C. do.

If less than three receivers 40 have received the RF signal of the state sensing device 30, the position of the state sensing device 30 cannot be calculated by triangulation. At this time, the server 50 estimates that it is within a range determined by the received signal strength centered on the position of the receiving device 40 that has received the signal. That is, the server 50 may not accurately calculate the position of the state sensing device 30, but may calculate an approximate position.

Preferably, the server 50 stores and manages the position of the state sensing device 30 as a pair of (center point, radius). If there are three or more receivers 40 that have received the RF signal of the state sensing device 30, the radius will be quite small, and if less, the radius will be relatively large.

The server 50 receives the received signal from each state sensing device 30 at the transmission cycle interval of each sensing device.

Next, the configuration of the receiving device 40 according to an embodiment of the present invention will be described with reference to FIG. 3.

As shown in FIG. 3, the reception device 40 includes a control unit 41, a first communication unit 42, a second communication unit 43, and an RF communication unit 44. The apparatus may further include a memory 45 for storing necessary data and a power supply 46 for supplying power.

The first communication unit 42 is a communication device employing a protocol capable of exchanging information between digital devices such as RS232 or RS422. In addition to communication such as RS232 or RS422, a communication device employing the USB protocol may be used.

The second communication unit 43 is a communication device adopting a protocol capable of communicating via a network such as Ethernet.

Receiving device 40 has a dual connection means for connecting the first communication unit 42 and the second communication unit 43 to the server device by a UTP cable connected separately to increase the connection reliability compared to the existing asset management system.

The control unit 41 receives all the wireless data signals transmitted from the state sensing device 30 through the RF communication unit 44, stores them in the memory 45, and requests the server 50 through the second communication unit 43. Receives and transmits a wireless data signal to the server 50 in accordance with the request. The RF communication unit 44 receives a wireless data signal transmitted from a plurality of sensing devices existing within a wireless data signal (or RF signal) receiving range (or communication radius).

In addition, the RF communication unit 44 measures the strength of the wireless data signal received by the state sensing device 30 and stores it in the memory 45.

The RF communication unit 44 uses the Zigbee-based wireless data communication technology of the 2.4 GHz band as the state sensing device 30 and the wireless data communication means. Since the RF communication unit 44 uses a 48V DC power source recommended in the IEEE802.3af standard, it is possible to use a PoE power supply device in which a variety of existing and highly reliable products are released.

On the other hand, the memory 45 may be configured separately from the control unit 41, or may be configured as a built-in type of the control unit 41.

The controller 41 measures the strength of the wireless data signal received by the state sensing device 30 and sends it to the server 50 through the second communication unit 43 so that the value of the server 50 can calculate the position of the sensing device. Provide information.

The first communication unit 42 may be connected to a general computer (PC) to manage the detection device 30 such as registration, release, unique numbering, model and version check of the state detection device 30. In addition, it performs a function of managing the receiving device 40, such as setting the unique number of the receiving device 40, Ethernet IP address setting.

Next, the configuration of the state sensing device 30 according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 4, the state sensing device 30 includes an antenna 37, a communication unit 32, a control unit 36, and a counter 31. The state sensing device 30 also includes a battery 33 for supplying power and a memory 38 for storing necessary data. In addition, the state detecting device 30 may further include a movement detecting unit 30 and the damage detecting unit 30.

The communication unit 32 transmits the article state information through the antenna 37. The state sensing device 30 transmits an RF signal (or a wireless data signal) to the receiver 40 without a separate antenna by embedding the antenna 37.

The control unit 36 is operated by the received on signal to send the stored article state information through the communication unit 32 and to switch the communication unit 32 and itself into a sleep mode.

The counter 31 counts the transmission cycle and transmits an on signal to the controller 36 when the count is completed. Therefore, the controller 36 receives the on signal from the counter 31 and wakes it up, and transmits the goods state information to the server 50 through the receiving device 40. After transmission, the control unit 36 switches to the sleep mode. In this case, the transmitted information may also transmit information about the battery voltage in addition to the tag information.

In other words, the counter 31 sends out the goods status information at each delivery cycle, and switches to the sleep mode at other times.

The controller 36 measures the voltage of the battery 33 using a built-in voltage meter and transmits the measured value to the receiver 40. The server 50 may receive the battery voltage from the receiver 40 to know information on whether the battery built in each state sensing device 30 is normal and the life expectancy.

The movement detector 34 transmits an on signal to the controller 36 when movement is detected. The control unit 36 wakes up when receiving the on signal and transmits the stored state information of the goods through the communication unit 32.

The movement detecting unit 34 may measure the state of change when the sensing device 30 moves or shakes by the built-in vibration sensor. The control unit 36 transmits the moving state or the change state detected by the movement detecting unit 34 together with the article state information to the receiving device 40.

The state sensing device 30 includes a main body (not shown) in which the control unit 36, the counter 31, and the communication unit 32 are embedded. The damage detection unit 35 transmits an on signal to the control unit when it is detected that the main body is damaged. The control unit 36 receives the on signal and wakes up and transmits the stored state information of the goods through the communication unit 32.

The breakage detecting unit 35 may measure a state of change when the sensing device 30 is broken or the body is opened by a switch connected to the main body. The control unit 36 transmits the damage state or the change state detected by the damage detection unit 35 together with the article state information to the receiving device 40.

The battery 38 is built-in to enable long-term operation for years without a separate power supply.

Next, a method in which the state sensing apparatus 30 updates the transmission cycle by itself according to an embodiment of the present invention will be described with reference to FIG. 4.

The control unit 36 of the state sensing device 30 changes the discharging cycle of the counter according to the movement detecting state.

Preferably, the control section 36 is initialized to a minimum delivery period.

In addition, preferably, the control unit 36 detects as many times as the update reference number of the transmission period and increases the transmission period according to the increase rate when the movement is not detected. However, the maximum sending period is set and if the sending period is larger than the maximum sending period, the maximum sending period is set.

Preferably, the control unit 36 initializes the discharging cycle to the minimum discharging cycle when it detects movement or the like. At this time, the detection of the movement is performed by the movement detecting unit 34 or the damage detecting unit 35. That is, the movement detection unit 34 detects the movement of the state detection device 30 and the damage detection unit 35 detects the damage of the state detection state 30. When any one of these occurs, it is determined that movement or the like is detected.

Hereinafter, an example will be described on the assumption that the minimum transmission period is 10 seconds, the update reference number is 60 times, the maximum transmission period is 1 hour, and the increase rate is 6 times.

The delivery period of the counter 31 is initially initialized to 10 seconds, and the control unit 36 wakes up every 10 seconds to transmit the state information of the article to the server 50. Then go back to sleep mode.

The control unit 36 transmits the status information of the article to the server 50 by switching to the wake-up mode from the 60th sleep mode for 10 minutes (or 600 seconds). If no movement or damage is detected during this period, the delivery cycle of the counter 31 is increased to 60 seconds. That is, the controller 36 sets the delivery cycle of the counter 31 to 1 minute (or 60 seconds) and switches to the sleep mode. The counter 31 counts a one-minute delivery cycle and sends an ON signal to the control unit 36 in the sleep mode at one-minute intervals to wake up.

Next, the delivery period of the counter 31 is 1 minute, and the server 50 receives the RF signal transmitted by the state sensing device 30 every minute to calculate the position of the state sensing device 30.

The controller 36 transfers the state information of the article to the server 50 by switching from the sleep mode to the wake-up mode for 1 hour (or 60 minutes). If no movement or damage is detected during this period, the delivery cycle of the counter 31 is increased to 6 minutes.

Next, the controller 36 increases the delivery cycle to 36 minutes if no movement is detected for 6 hours. The next 36 hours of inactivity are 216 minutes (= 36 X 6), but exceed the maximum delivery cycle. Therefore, the control unit 36 sets the delivery period to 1 hour.

The foregoing embodiment is a method of increasing the proportionally by setting the minimum transmission period, the number of update criteria, the increase rate, the maximum transmission period constant.

As another embodiment, it may be determined by using a table that sets the number of transmission cycles and update criteria for each incremental step.

As shown in Fig. 2, the initialization sets the transmission cycle to 10 seconds, which is one step, and the update reference number is 60 times. That is, if no movement or the like is detected for 10 minutes, the transmission period is increased to 30 seconds, which is a second stage. If no movement or the like is detected for 30 minutes (60 times), the transmission cycle is increased to three steps, one minute. As described above, the delivery cycle is increased step by step from the lowest stage to the highest stage. At this time, if the maximum discharging cycle is set to 1 hour, the discharging cycle of the highest stage N is 1 hour, and the number of update criteria is infinite.

If the movement of the state sensing device is detected in step 5, the transmission cycle is determined as the first step, step 1 again.

Assets include mobile parts such as carts, and devices that are fixed for a long time, such as refrigerators. Therefore, if the delivery cycle is adjusted in the above manner, the refrigerator or the like will send out its position at the maximum delivery cycle, and the cart will send out its position at a much smaller delivery cycle.

If the refrigerator is moved and re-installed, the state detection device 30 detects the movement, transmits an RF signal, and initializes the first stage to transmit its position. However, the refrigerator will be moved to its maximum delivery cycle again, as its position will remain unchanged for a long time.

As described above, if the discharging period is determined in proportion to the time that the state sensing device is maintained at the same position, each state sensing device 30 has an effect of minimizing the consumption of the battery according to the attached assets. That is, battery problems caused when using an active RFID tag can be minimized.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example, Of course, a various change is possible in the range which does not deviate from the summary.

The present invention is to develop a USN-based asset management system that can be installed on the goods to send the status information about the goods to the server, and the state and location of the asset (or goods) based on this management Application is possible.

1 is a diagram showing the configuration of a USN-based asset management system according to an embodiment of the present invention.

2 is a block diagram showing the configuration of a receiving apparatus according to an embodiment of the present invention.

3 is a block diagram showing the configuration of a state detection apparatus according to an embodiment of the present invention.

Figure 4 is a table showing an example of determining the transmission cycle and the update reference number of times of the state detection apparatus according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: building 20: asset (goods or equipment)

30: state sensing device 31: counter

32: communication unit 33: battery

34: movement detecting unit 35: damage detecting unit

36: sensing device control unit 37: RF antenna

38: sensing device memory 40: receiving device

41: receiving device control unit 42: first communication unit

43: second communication unit 44: RF communication unit

45: receiver memory 46: power supply

50: server

Claims (7)

In the state sensing device mounted on the article to send status information about the article to the server, Communication unit for sending the goods status information; A control unit which is operated by a received on-signal to transmit stored article state information through the communication unit and to switch the communication unit and itself into a sleep mode; A counter for counting a discharging period and transmitting an on signal to the controller when the count is completed; And If the movement is detected includes a movement detection unit for transmitting an (on) signal to the control unit, The control unit changes the discharging period of the counter according to the movement detecting state, and if the movement is not detected by the movement detecting unit, increases the discharging period of the counter in proportion to the time for which the movement is not detected. , The control unit initializes the dispensing cycle of the counter to a minimum dispensing cycle, and detects as many times as the update reference number of the dispensing cycle and increases the discharging cycle according to the increase rate when the movement is not detected. State sensing device, characterized in that to initialize at a cycle. delete delete delete The method of claim 1, The state detection device, A main body having the control unit, a counter, and a communication unit; And a damage detecting unit for transmitting an on signal to the control unit when the main body is detected to be damaged. A state sensing device that transmits, on a periodic basis, the article state information stored and stored in an RF signal and switches back to a sleep mode according to a delivery cycle; A server for receiving the RF signal from the state sensing device to determine the location information of the asset to which the state sensing device is attached; Receiving device for relaying communication between the state detection device and the server, If the state detection device is not detected movement or breakage increases the discharge period in proportion to the time duration that the movement or breakage is not detected, The state detecting apparatus initializes the discharging cycle to the minimum discharging cycle, detects the number of times of updating the discharging cycle, and increases the discharging cycle according to an increase rate when no movement or breakage is detected. USN-based asset management system, characterized in that to initialize the cycle to the minimum delivery cycle. delete

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