KR102481233B1 - Method for transmitting data between terminals and access point based on LoRa wireless communication technology - Google Patents

Abstract

The present invention is an IoT indoor safety management integrated system for automatically monitoring and managing safety problems that may occur indoors in a building without an internal Internet network in a fire safety management system that converges indoor location-based technology of the Internet of Things (IoT). It is about a data transmission method between terminals and APs by Lora communication that enables development of IoT indoor safety for automatically monitoring and managing safety problems that may occur indoors in buildings without internal Internet networks without network costs. It provides an integrated management system and implements one-to-many LoRa communication to analyze data received from beacons for fire detection management, personnel safety management, asset management and anti-theft management, and emergency notification indoors in a building without an internal Internet network. An integrated control system capable of real-time automatic monitoring based on indoor location can be provided.

Description

Method for transmitting data between terminals and AP by LoRa communication {Method for transmitting data between terminals and access point based on LoRa wireless communication technology}

The present invention relates to a data transmission method, and in particular, a fire safety management system converged with indoor location-based technology of the Internet of Things (IoT) automatically monitors and manages safety problems that may occur indoors in a building without an internal Internet network. It relates to a data transmission method between a terminal and an AP by Lora communication that can be developed into an IoT indoor safety management integrated system for

A fire is a great disaster that takes away everything in an instant. In the event of a fire, it takes a lot of money and time to restore, along with economic loss that disappears with the fire.

In particular, fire causes not only economic loss but also human casualties that cannot be replaced with anything and cannot be restored forever.

Looking at recent fire disasters, even in well-equipped fire prevention facilities, a little carelessness can instantly lead to a major fire. At the center of the accident where a small initial fire spreads into a large fire is the lack of a control tower to control the fire in the building.

It is most important to try to prevent a fire from occurring, but if a fire breaks out unavoidably, it is important to quickly extinguish the fire and minimize human damage by identifying the ignition point and cause of the fire in the shortest time.

Therefore, fire detection by heat (temperature) and smoke and beacon (beacon) are required to minimize human life and property damage caused by fire by not only detecting fire but also quickly identifying the fire ignition point and the number of people to be evacuated within the fire area at the same time. ), it is possible to build a real-time operating platform that can automatically control fires in buildings by indoor location-based technology, and collect real-time fire information transmitted from smart fire detectors to monitor according to big data analysis. And a fire detection system using an IoT-based smart fire detector capable of guiding a safe escape route has been proposed.

However, a fire detection system using such a conventional IoT-based smart fire detector has a problem in that it cannot sufficiently respond to safety problems occurring indoors in a building without an internal Internet network.

KR 10-0971623 B1 (2010.07.15.) KR 10-2019-0040887 A (2019.04.19.) KR 10-1950093 B1 (2019.02.13.) KR 10-2126281 B1 (2020.06.18.)

Therefore, the present inventors comprehensively consider the above-mentioned matters and focus on solving the limitations and problems of the IoT smart fire detection system that cannot be operated indoors in a building without an internal Internet network, The present invention was created as a result of continuous research with great efforts to develop an IoT indoor safety management integrated system for automatically monitoring and managing safety problems that may occur indoors.

Therefore, the technical problems and objects to be solved by the present invention are BLE short-range communication (reception) and LoRa long-distance communication (transmission) for IoT sensor reception and location tracking for safety problems that may occur in areas without an internal Internet network. It is to provide a data transmission method between a smart safety sensor and an AP that enables simultaneous use.

Here, the technical problems and objects to be solved by the present invention are not limited to the technical problems and objects mentioned above, and other technical problems and objects not mentioned will be clearly understood by those skilled in the art from the following description.

A method for transmitting data between a terminal and an AP by LoRa communication according to the present invention for achieving the above object is a beacon identification value, ambient temperature value, and battery from surrounding beacons installed in buildings and indoors without an internal Internet network The LoRa AP transmits a data transmission request signal in the form of a broadcast to a plurality of smart safety sensor terminals that scan power values and RSSI values, and the terminal includes beacon data packets and terminal identification values from the smart safety sensing terminals. By receiving data packets in a time-division (TDM) method and bypassing the terminal data packets as LoRa AP data packets to the server as they are, a network without network costs due to line use by communication network operators is characterized in that a network without usage fees is configured. to be

In addition, in the data transmission method between a terminal and an AP by LoRa communication according to the present invention, the signal generation interval of the transmission request signal is set in consideration of the scan time and response time of the beacons in the smart safety sensor terminal, preferably. It can be set to 15 seconds.

In addition, in the method of transmitting data between a terminal and an AP by LoRa communication according to the present invention, the LoRa AP is soft-reset by using the watch dog function of the MCU at regular intervals to be a server that may occur during long-term operation. It is desirable to prevent breakage of data packets to be transmitted.

As described above, the present invention can apply IoT indoor location-based technology in buildings and indoors without an internal Internet network (eg, internal building work, indoor enclosed space, etc.), and efficient safety management by enabling automatic safety management monitoring service. There is an effect that can provide.

In addition, the present invention has an effect of reducing the user's installation construction cost by applying the IoT indoor location-based technology in a building and indoors without an internal Internet network without network cost.

In addition, the present invention provides a new technology for indoor and outdoor location-based services through a smart safety sensor that combines BLE short-range communication technology for beacon sensor data collection and LoRa long-distance communication technology without an internal Internet network, and expands related business fields. There are possible effects.

Accordingly, the present invention can provide an operating plan for industrial safety management measures that are repeated every year as an alternative through a new system, and by realizing a safer industrial structure to prepare for the 4th industrial revolution and reduction of introduction costs It has the effect of minimizing industrial safety management costs.

1 is an IoT indoor safety management integrated system for automatically monitoring and managing safety problems that may occur indoors of a building without an internal Internet network, which requires a data transmission method between a terminal and an AP by LoRa communication according to the present invention. schematic diagram,
2 is a conceptual diagram of a smart safety sensor capable of BLE short-range communication (reception) and LoRa long-distance communication (transmission) of a beacon to which a data transmission method between a terminal and an AP by LoRa communication according to the present invention is applied;
3 is a network configuration diagram showing a method of transmitting data between a terminal and an AP by LoRa communication according to the present invention;
4 is a block diagram of a smart safety sensor terminal to which a data transmission method between a terminal and an AP by LoRa communication according to the present invention is applied;
5 is a diagram showing a beacon scan data packet according to a data transmission method between a terminal and an AP by LoRa communication of the present invention;
6 is a diagram showing a packet format for a LoRa AP board according to a data transmission method between a terminal and an AP by LoRa communication of the present invention;
7 to 9 are diagrams showing communication packets of a beacon scanner according to the method of transmitting data between a terminal and an AP by LoRa communication of the present invention;
10 is a diagram showing the overall configuration of LoRa communication packets according to the method of transmitting data between a terminal and an AP by LoRa communication according to the present invention;
11 is a diagram sequentially showing data transmission signals between a LoRa terminal or a smart safety sensor and a LoRa AP according to the method for transmitting data between a terminal and an AP by LoRa communication according to the present invention;
12 is a diagram showing operation timing and sequence between a terminal and an AP according to a data transmission method between a terminal and an AP by LoRa communication according to the present invention.

Hereinafter, an embodiment of a method for transmitting data between a terminal and an AP by LoRa communication according to the present invention will be described in detail with reference to the drawings. The embodiments described below are provided to fully inform those skilled in the art of the scope of the invention, and the present invention may be implemented in various forms without being limited to the embodiments disclosed below.

Like elements in the drawings indicate like reference numerals wherever possible. Specific details have been shown in the following description, which are only provided to help a more general understanding of the present invention, and are not intended to limit the present invention to specific embodiments, and all changes included in the spirit and technical scope of the present invention , it should be understood to include equivalents or substitutes. In the description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Here, the accompanying drawings are partially exaggerated or simplified for convenience and clarity of explanation and understanding of the configuration and operation of the technology, and it is revealed that each component does not exactly match the actual size.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In addition, when a part includes a certain component, this means that it may further include other components, rather than excluding other components, unless otherwise stated, and the meaning of the term "part" Means a unit or module form that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software.

Unless defined otherwise, 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 the present invention belongs. Terms such as those defined in commonly used dictionaries are defined in consideration of functions in the present invention, which should be interpreted as concepts consistent with the technical idea of the present invention and meanings commonly used or commonly recognized in the art. and, unless explicitly defined in this application, are not to be construed in an ideal or overly formal sense.

Combinations of each block in the accompanying block diagram and each step in the flowchart may be performed by computer program instructions. Since these computer program instructions may be loaded into a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are each block of the block diagram or flowchart. In each step, means to perform the functions described are created.

The method for transmitting data between a terminal and an AP by LoRa communication according to the present invention is to automatically monitor and manage safety problems that may occur in a building or indoors without an internal Internet network based on the IoT indoor location by improving the function of the IoT smart fire detection system. It is an essential technology to develop into an IoT indoor safety management integrated system for

First, FIG. 1 is IoT indoor safety management integration for automatically monitoring and managing safety problems that may occur indoors of a building without an internal Internet network, which requires a method of transmitting data between a terminal and an AP by LoRa communication according to the present invention. As a schematic diagram of the system, the IoT indoor safety management integrated system develops a BLE beacon that improves the problems of existing beacons to track the location inside the building and identify the state by sensors (Phase 1), and the area (Point) without an internal Internet network. Development of smart safety detector capable of simultaneous BLE short-range communication (reception) and LoRa long-distance communication (transmission) for sensor reception and location tracking (2nd stage), data API interworking and big data analysis, IOT indoor location-based safety management according to algorithm development It consists of developing a monitoring server (step 3) and developing an integrated control system (function improvement) and monitoring system (step 4) for IoT indoor location-based safety integrated control. It mainly relates to a data transmission method made in the BLE beacon 100 and the AP 300.

Reference number 400 in FIG. 1 is an IoT indoor location-based safety management monitoring server, and IoT indoor location-based real-time automatic monitoring is integrated in the control management room 500 through big data analysis and processing based on data collected from AP through the LoRa base station. It allows the operation of the control system 510 and provides a system capable of monitoring anytime, anywhere through the smartphone 600.

The integrated control system 510 is a real-time automatic monitoring system based on indoor location by analyzing the data received from the beacon. Personnel safety management system that performs real-time personnel monitoring in access control zones and safe work zones, asset management and anti-theft management system that provides real-time inventory identification and theft notifications when assets are moved by attaching beacons And it may include an emergency notification system that provides emergency text notification and emergency dispatch notification when an emergency occurs.

2 is a conceptual diagram of a smart safety sensor capable of BLE short-range communication (reception) and LoRa long-distance communication (transmission) of a beacon to which a data transmission method between a terminal and an AP by LoRa communication according to the present invention is applied, and FIG. 3 is the present invention 4 is a block diagram of a smart safety sensor to which the data transmission method between a terminal and an AP by LoRa communication according to the present invention is applied.

1 to 4, the beacon 100 according to the present invention applies IoT indoor location-based technology in a building and indoors without an internal Internet network (eg, building interior construction, indoor enclosed space, etc.), smart safety Data is provided so that the detector 200 can perform anti-theft, asset management, location finding, and sensor sensing. Data provided by the beacon 100 to the smart safety sensor 200 may be ID, RSSI, POWER, temperature value, and the like.

At this time, in the network configuration, when using the LoRa network (base station) of a communication network operator (KT, SKT, etc.), direct connection to the server 400 according to the present invention is impossible, so through a communication network operator server (not shown) A method of storing data in the server 400 according to the present invention as an API should be used. However, when using the LoRa network of a communication network operator, authentication of the corresponding communication network operator is required for hardware and software, there is a risk of generating a large number of registered terminals in a one-to-one network configuration, and network costs are incurred due to line use, so usage fees are incurred. A LoRa AP is required to configure a network without

In particular, a plurality of smart safety detectors (201, 202, 203) and the AP (300) perform LoRa wireless communication, and the LoRa AP board (310) must be connected to the server (400) through a wired network (Ethernet), Since the LoRa standard communication protocol is a one-to-one method, the LoRa standard protocol cannot be used, the Ethernet controller interface is required for the LoRa module, and URL method transmission is not possible in the LoRa module. By directly transmitting data to the server 400 according to the present invention without using a LoRa network, one-to-many communication is implemented.

To this end, an ID is given to the LoRa AP board 310 instead of a network key and an App key, a time division (TDM) method is used to prevent simultaneous reception, and a transmission delay according to the ID of each LoRa AP board 310 is applied. . At this time, when configuring the LoRa AP board 310, it is configured as a multi-module. On the other hand, since the number of smart safety detectors 200 connected to the LoRa AP board 310 is limited due to the use of the time division method, the smart safety sensor 200 connected to the LoRa AP board 310 is considered considering the scan time of the beacon 100. It is desirable to determine the number of safety detectors (200). In addition, for wired network communication, the LoRa AP 300 implements a wired network interface 320 such as a raspberry on the LoRa AP board 310 together.

In the method for transmitting data between a terminal and an AP by LoRa communication according to the present invention, from the smart safety sensor 200 in which the BLE short-range communication technology for collecting beacon 100 data and the LoRa long-distance communication technology are combined without an internal Internet network, the AP ( 300), the irregular signal strength (RSSI) value received from the beacon 100 provided to the server 400 can be accurately confirmed as an indoor point through an RSSI analysis algorithm for accurate distance calculation.

The smart safety sensor 200 according to the present invention receives data (39Byte Data packet) from the beacon 100 and transmits the received data packet to the AP. To this end, the smart safety detector 200 includes an MCU 210, a beacon receiver 220, a LoRa communication unit 230, a battery 240, a power supply unit 250, and other detection sensors 260.

The beacon 100, the smart safety sensor 200, and the LoRa AP 300 for performing the method of transmitting data between a terminal and an AP by LoRa communication according to the present invention implement the following performances and functions.

(1) Beacon (100)

- Compliance with beacon basic specifications and data packet compatibility

- Beacon recognition distance: at least 10m (based on straight-line distance without obstacles)

- Transmission cycle: 3 seconds (changeable by jig)

- Battery life: more than 3 months based on CR2032

- Sensor detection: temperature

- Transmission data (required): MAC, RSSI, battery voltage, temperature

(2) Smart safety detector (200)

- Data transmission using beacon reception and LoRa communication module

- Beacon packet reception capacity: Receive more than 10 beacon packets per 3 seconds

- Communication of multiple smart safety sensors through LoRa AP (300)

- Power Supply: Common power adapter and battery

- Battery life: at least 1 month

- Common for LoRa wireless communication and Ethernet

- Server transmission cycle: 15 seconds

- Power Reset, On/Off

- Operation check LED

(3) LoRa AP (300)

- Initialize beacon scanner

- Send beacon scan command

- Receive and analyze beacon data

- LoRa data configuration and transmission

- LoRa data: up to 64Byte

5 is a diagram showing a beacon scan data packet according to a data transmission method between a terminal and an AP by LoRa communication of the present invention. The beacon scan data packet is composed of a total of 10 bytes, and includes a beacon ID, temperature value, battery voltage value, and RSSI. contains the value

6 is a diagram showing a packet format for a LoRa AP board according to a method for transmitting data between a terminal and an AP by LoRa communication according to the present invention, consisting of a total of 10 bytes, and the ID of the LoRa AP board 310 and the number, etc. 'oxff' can be used as the value of the delimiter field.

According to the data packet format of FIGS. 5 and 6, in the method of transmitting data between a terminal and an AP by LoRa communication according to the present invention, there is no problem with multiple connections even when moving rather than a 1: 1 connection pairing method, which is a general Bluetooth communication method. Provides API for broadcasting (multiplexing) method BLE communication and data interworking. Accordingly, it is possible to collect data and transmit sensor values through a collector and a smartphone.

7 to 9 are diagrams illustrating communication packets of a beacon scanner according to a data transmission method between a terminal and an AP by LoRa communication of the present invention. FIG. 7 is a request and response packet for reset, and FIG. is a packet for a request and response to a device init, and FIG. 9 shows a structure of a packet developed for a request and response to a device discovery request.

The packets of FIGS. 7 to 9 are basic commands necessary for scanning the beacon scanner, and the reset command of FIG. 7 resets the beacon scanner. The Device Init command of FIG. 8 sets the initial setting of the beacon scanner, and sets the beacon Profile role and the number of Max scans. The Device Discovery Request command of FIG. 9 starts a beacon scan of the surroundings.

10 is a diagram showing the overall configuration of LoRa communication packets according to the method of transmitting data between a terminal and an AP by LoRa communication of the present invention. and the information data of the LoRa AP board 310 are collected and converted into a total of 64 bytes of LoRa transmission data. The delimiter of the data packet for LoRa transmission is a delimiter indicating a response packet for LoRa communication and may have a 'PONG' value.

Referring to FIGS. 5 to 10, the software functions for designing the software structure of the LoRa AP 300 are summarized. Since simultaneous data reception is not possible with the LoRa protocol, which is basically a one-to-one communication method, one-to-many network and data For reception, a time division (TDM) method is applied, and data multi-reception by time difference is implemented.

First, a data transmission request signal is transmitted to the LoRa terminal 200, and a method of bypassing the LoRa terminal data received due to a time difference to the server 400 is transmitted. A transmission request signal is generated according to the number of connections of the LoRa terminal 200 and a time interval is determined. For example, it takes about 10 seconds for a beacon scan in the LoRa terminal 200, and can be set to 15 seconds in consideration of the response time of each terminal.

Subsequently, the data packet is transmitted through the wired network (Ethernet) to the serial port in a manner of bypassing the packet received from the terminal 200 .

11 is a diagram showing data transmission signals between a LoRa terminal or smart safety sensor 200 and a LoRa AP (300) in sequence. The basic transmission/reception protocol of the LoRa AP (300) is the data transmission request of the AP (300) is 'PING' A 'delimiter is used, and the data transmission reply of the terminal 200 uses a 'PONG' delimiter.

Since the data packet of the AP 300 bypasses the data received from the terminal 200 as it is to the server 400 and transmits it, the same data packet format as that of the LoRa terminal 200 is applied.

12 is a diagram showing operation timing and sequence between a terminal and an AP according to a data transmission method between a terminal and an AP by LoRa communication according to the present invention, and summarizes a communication sequence between a LoRa terminal 200 and an AP 300.

First, when the AP 300 transmits a request signal in a broadcast form, the terminal 200 transmits a delay response according to an ID value and immediately transmits a beacon scan command to detect nearby beacon modules. Upon receiving terminal 200 data received with a time difference, the AP 300 bypasses the received data and transmits it to the server 400 . This series of processes is continuously repeated every 15 seconds.

Meanwhile, when the method of transmitting data between a terminal and an AP by LoRa communication according to the present invention is operated for a long time, a data packet transmitted from the AP 300 to the server 400 is broken and garbage data is transmitted.

Therefore, it can be solved by predicting that such a problem will occur as time elapses in the AP 300 and resetting the AP 300 after a certain amount of time has elapsed. The reset of the AP 300 may be performed by performing a soft reset using a watch dog function of the MCU at regular intervals.

On the other hand, since the limit on the number of recognized beacons is currently set at 5, the number of LoRa transmittable data is fixed at a maximum of 60 bytes, and since beacon data is 10 bytes, only up to 5 can be transmitted. In addition, the beacon recognition time is because the beacon scan time is about 10 seconds and a spare time of about 5 seconds is applied because a time difference response must be made according to the number of terminals 200.

As described above, the method for transmitting data between a terminal and an AP by LoRa communication according to the present invention is IoT indoor safety for automatically monitoring and managing safety problems that may occur indoors of a building without an internal Internet network without network cost. An integrated management system can be provided.

In addition, the method of transmitting data between terminals and APs by LoRa communication according to the present invention implements one-to-many LoRa communication, thereby managing fire detection, personnel safety management, asset management and anti-theft management, emergency It is possible to provide an integrated control system capable of real-time automatic monitoring based on indoor location by analyzing the data received from the beacon for situation notification.

Meanwhile, in the detailed description of the present invention, although it has been specifically described with reference to the preferred embodiments referenced by the accompanying drawings, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the scope of the claims to be described later, but also those equivalent to the scope of these claims.

100: BLE beacon 200: smart safety sensor terminal
201, 202, 203: individual terminal 210: terminal MCU
220: beacon communication unit 230: LoRa communication unit
240: battery 250: power supply unit
260: other detection sensor 300: LoRa AP
310: LoRa AP board 320: wired network interface
400: server 500: control management office
510: integrated control system 600: smartphone

Claims (3)

In the method of transmitting data between a LoRa terminal and a LoRa AP by LoRa communication using a system including a beacon module, a LoRa terminal, and a LoRa AP,
Transmitting, by the LoRa AP, a transmission request signal to the LoRa terminal;
detecting, by the LoRa terminal, a nearby beacon module;
receiving information from the beacon module by the LoRa terminal;
Transmitting, by the LoRa terminal, the information transmitted from the beacon module and the LoRa terminal information in a time division manner according to a time interval corresponding to the ID of the LoRa AP; and
Transmitting, by the LoRa AP, the information transmitted from the LoRa terminal to an external server in a time division manner;
The step of transmitting to the server in a time division manner is to determine a time interval based on the number of LoRa terminals connected to the LoRa AP,
Data transmission method between LoRa terminal and LoRa AP by LoRa communication.
According to claim 1,
The signal generation interval of the transmission request signal is,
Characterized in that the LoRa terminal is set in consideration of the scan time and response time of the beacons,
Data transmission method between LoRa terminal and LoRa AP by LoRa communication.
The method of claim 1, wherein the LoRa AP,
Characterized in that a soft reset is performed using the watch dog function of the MCU at regular intervals,
Data transmission method between LoRa terminal and LoRa AP by LoRa communication.

Images