KR102117166B1 - SENSOR NETWORK, IoT APPARATUS FOR THE SENSOR NETWORK AND WAKE-UP METHOD BY THE IoT APPARATUS - Google Patents

Abstract

The IoT device includes: a second LF receiver that receives a signal in the LF band; A second information processing unit processing a signal received by the second LF receiving unit; And a second LF transmitter for transmitting a signal in the LF band, wherein the signal received by the second LF receiver includes a preset sequence number and a wake-up signal of another device that has transmitted the signal. do.

Description

Sensor network, IoT device for sensor network, and wake-up method of IoT device {SENSOR NETWORK, IoT APPARATUS FOR THE SENSOR NETWORK AND WAKE-UP METHOD BY THE IoT APPARATUS}

The present invention relates to a sensor network, an IoT device for the sensor network, and a wake-up method of the IoT device, and more specifically, a wake-up between a plurality of IoT devices for the sensor network can be performed in the form of a relay. A sensor network, an IoT device for the sensor network, and a wake-up method of the IoT device.

For IoT (Internet of Things) devices that are battery-powered without using a power cord, sleep and wake up the main MCU, power supply, and peripheral parts to ensure long battery life. PSM (Power Save Mode) is performed.

In addition, polling type IoT devices having a constant interval for transmitting the processed information can operate at a low power level only by using PSM, but suffer from real-time processing. Conversely, in the case of event driven IoT devices that emphasize real-time performance, when the polling process is applied, current consumption becomes severe due to unnecessary wake-up, and when polling cycles are increased to reduce current consumption, real-time This results in losing sex. This phenomenon is more severe in clustered sensor networks, not at individual IoT device levels.

Therefore, it is necessary to specify the wake-up point of the IoT devices scattered in the IoT sensor network, and through this, the IoT devices need to secure real-time information expression while operating at ultra-low power.

The present invention is an invention aimed at solving the technical problems as described above, and allows the wake-up time point of IoT devices scattered in the IoT sensor network to be specified. Through this, the IoT devices are operated with ultra-low power and express information. An object of the present invention is to provide a sensor network capable of guaranteeing the real-time performance of, an IoT device for the sensor network, and a wake-up method of the IoT device.

IoT device of the present invention, the second LF receiving unit for receiving a signal in the LF band; A second information processing unit processing a signal received by the second LF receiving unit; And a second LF transmitter for transmitting a signal in the LF band.

Specifically, the signal received by the second LF receiving unit is characterized in that it includes a preset sequence number and a wake-up signal of another device that transmits the signal.

In addition, when a signal is received by the second LF receiving unit, the IoT device of the present invention wakes up in a sleep mode, and the second information processing unit transmits a signal received by the second LF receiving unit. It is preferable to determine whether the sequence number of the device is the sequence number of the IoT device.

In addition, the IoT device of the present invention, when the result of the determination of the second information processing unit, when the sequence number of another device that has transmitted the signal received by the second LF receiving unit is the front sequence number of the IoT device, the second LF transmitting unit It is characterized by transmitting a signal by.

Preferably, the signal transmitted by the second LF transmitting unit is characterized in that it comprises a sequence number and a wake-up signal of the IoT device of the present invention.

In addition, the IoT device of the present invention, as a result of the determination of the second information processing unit, if the sequence number of another device that has transmitted the signal received by the second LF receiver is the sequence number of the corresponding IoT device, the first predetermined event After processing, it is preferable to return to the sleep mode. In addition, the IoT device of the present invention, if the result of the determination of the second information processing unit, if the sequence number of another device that transmits the signal received by the second LF receiver is not the preceding sequence number of the corresponding IoT device, the IoT device returns to the sleep mode. It is characterized by.

In addition, when the preset polling time expires, the IoT device of the present invention preferably processes the second predetermined event, initializes the polling time, and returns to the sleep mode.

The sensor network of the present invention includes the IoT device of the present invention described above; And a trigger device.

Specifically, the trigger device includes a first LF transmitter for transmitting a signal in the LF band; however, the trigger device is preferably the most advanced device in comparison with other devices constituting the sensor network.

A wake-up method of an IoT device constituting the sensor network of the present invention includes: (a) receiving a signal in an LF band; And (b) after completion of the step (a), the IoT device wakes up in a sleep mode, and determines whether the sequence number of another device that has transmitted the signal received in the step (a) is the front sequence number of the IoT device. Step; includes.

In addition, as a result of the determination in step (b), when the sequence number of another device that transmits the signal received in step (a) is not the preceding sequence number of the IoT device, the IoT device returns to the sleep mode. .

In addition, the wake-up method of the present invention, when the result of the determination in step (b), the sequence number of another device that transmits the signal received in step (a) is the front sequence number of the IoT device, (c) LF band Transmitting a signal of; And (d) processing the first pre-specified event.

In addition, after completion of step (d), the IoT device is characterized in that it returns to the sleep mode.

In addition, the wake-up method of the present invention comprises: determining whether a preset polling time has expired; And when the preset polling time expires, processing a second predetermined event.

According to the sensor network of the present invention, the IoT device for the sensor network and the wake-up method of the IoT device, it is possible to specify the wake-up time of the IoT devices scattered in the IoT sensor network, through which the IoT devices are ultra-low power It is possible to guarantee the real-time performance of information expression while being operated as.

1 is a block diagram of a sensor network according to a preferred embodiment of the present invention.
2 is a flowchart of a wake-up method of an IoT device constituting a sensor network according to an exemplary embodiment of the present invention.
3 is an explanatory diagram of transmission of a wake-up signal in the entire sensor network according to an exemplary embodiment of the present invention.

Hereinafter, a sensor network according to embodiments of the present invention, an IoT device for the sensor network, and a wake-up method of the IoT device will be described in detail with reference to the accompanying drawings.

It goes without saying that the following examples of the present invention are only intended to embody the present invention and do not limit or limit the scope of the present invention. From the detailed description and examples of the present invention, what can be easily inferred by experts in the technical field to which the present invention pertains is interpreted as belonging to the scope of the present invention.

First, FIG. 1 is a configuration diagram of a sensor network 100 according to a preferred embodiment of the present invention.

As can be seen from Figure 1, the sensor network 100 according to an exemplary embodiment of the present invention includes a trigger device 10 and a plurality of Internet of Things (IoT) devices 20_1, 20_2, and 20_N. do.

Looking at the overall operation of the sensor network 100 of the present invention, the trigger device 10 utilizing the LF frequency wakes up nearby IoT devices 20_1, 20_2, and 20_N, and wakes up the IoT devices 20_1, 20_2 , 20_N) represents a relay structure in which other IoT devices 20_1, 20_2, and 20_N nearby wake up again. In addition, the trigger device 10 is triggered by receiving an event from a remote to transmit a wake-up signal.

The first LF transmitter 12 included in the trigger device 10 adopts an omni-directional antenna to awaken IoT devices 20_1, 20_2, and 20_N existing in all directions. Can't wake them all. In this case, the leading IoT device 20_1 wakes up the nearby IoT device 20_2 through the second LF transmitter 23 again, and the second IoT device 20_2 relays to the nearby IoT device 20_N again. In the form, a wake-up signal is transmitted.

During the relay, the signal of the LF band is not only transmitted to the nearby sleeping IoT devices 20_1, 20_2, 20_N, but also reaches the already waked-up IoT devices 20_1, 20_2, 20_N. In order to prevent such a backflow of the signal, in the present invention, the sequence numbers of the preset devices are compared.

The trigger device 10 may be, for example, a server. The trigger device 10 includes: a first remote receiver 11 capable of receiving a remote signal; And a first LF transmitter 12 for transmitting a signal in the LF band.

The trigger device 10 is the most advanced device in comparison with other IoT devices 20_1, 20_2, and 20_N constituting the sensor network 100, and slips multiple IoT devices 20_1, 20_2, and 20_N. It is desirable to trigger a transition from mode to wakeup.

Each of the plurality of IoT devices 20_1, 20_2, and 20_N includes: a second LF receiver 21 for receiving a signal in the LF band; A second information processing unit 22 for processing the signal received by the second LF receiving unit 21; And a second LF transmitter 23 for transmitting a signal in the LF band. That is, each of the plurality of IoT devices 20_1, 20_2, and 20_N is located at a node on the sensor network 100. Each of the plurality of IoT devices 20_1, 20_2, and 20_N may have a function of detecting a fire. In addition, each of the plurality of IoT devices 20_1, 20_2, and 20_N may transmit the corresponding information to the trigger device 10 which is a server by remote communication such as LTE when detecting a fire or according to a preset condition. . However, in the drawings of the present invention, the remote signal transceiver of the IoT devices 20_1, 20_2, and 20_N is not illustrated.

Also, the second information processing unit 22 may be implemented using at least a part of a processor such as an MCU or a CPU.

In addition, the IoT devices 20_1, 20_2, and 20_N need to be located at an appropriate short distance to transmit and receive signals in the LF band to each other.

Hereinafter, the operation of the sensor network 100 of the present invention will be described in more detail.

When at least one IoT device (20_1, 20_2, 20_N) detects a fire, for example, the trigger device 10, which is a server, through the first LF transmitter 12, the sequence number and wakeup of the trigger device 10 The signal is transmitted to the IoT devices 20_1, 20_2, and 20_N. Thereafter, propagation of the wake-up signal between the IoT devices 20_1, 20_2, and 20_N is performed.

The signal received by the second LF receiver 21 is characterized in that it includes a preset sequence number and a wake-up signal of another device that has transmitted the corresponding signal.

When the signal is received by the second LF receiver 21, the IoT devices 20_1, 20_2, and 20_N wake up in the sleep mode. As the IoT devices 20_1, 20_2, and 20_N wake up in the sleep mode, at least some of the functional blocks constituting the IoT devices 20_1, 20_2, and 20_N can operate.

That is, as the IoT devices 20_1, 20_2, and 20_N wake up in the sleep mode, the second information processing unit 22, the sequence number of another device that transmitted the signal received by the second LF receiving unit 21 is IoT It is preferable to determine whether the devices 20_1, 20_2, and 20_N are in front sequence.

As a result of the determination by the second information processing unit 22, if the sequence number of another device that has transmitted the signal received by the second LF receiving unit 21 is the front sequence number of the IoT devices 20_1, 20_2, and 20_N, the IoT device 20_1 , 20_2, 20_N) transmits a signal by the second LF transmitter 23. In addition, as a result of the determination by the second information processing unit 22, when the sequence number of another device that transmits the signal received by the second LF receiving unit 21 is not the preceding sequence number of the corresponding IoT device 20_1, 20_2, 20_N, The IoT devices 20_1, 20_2, and 20_N are characterized by returning to the sleep mode.

As a result of the determination by the second information processing unit 22, if the sequence number of another device that has transmitted the signal received by the second LF receiving unit 21 is the preceding sequence number of the corresponding IoT device 20_1, 20_2, 20_N, the IoT device ( 20_1, 20_2, and 20_N) return to the sleep mode after processing the first predefined event. The first event may be, for example, outputting a control signal for displaying an evacuation route. That is, when the IoT devices 20_1, 20_2, and 20_N generate and output a control signal for displaying an evacuation route, an evacuation route indicator (not shown) may receive this and display the evacuation route. Communication between the IoT devices 20_1, 20_2, and 20_N and the evacuation route indicator may use a remote communication method such as LTE.

In addition, the signal transmitted by the second LF transmitter 23 preferably includes the sequence number and wake-up signal of the IoT devices 20_1, 20_2, and 20_N.

The plurality of IoT devices 20_1, 20_2, and 20_N constituting the sensor network 100 of the present invention propagate signals in the LF band in a forward direction according to a predetermined sequence number. Between the plurality of IoT devices 20_1, 20_2, and 20_N, propagation of the signal in the LF band by the reverse sequence is prevented, so that the constant number of IoT devices 20_1, 20_2 of the signal transmitted from the trigger device 10 is 20_N) can be prevented, thereby minimizing the wake-up of each of the useless IoT devices 20_1, 20_2, and 20_N.

In addition, when the predetermined polling time expires, the IoT devices 20_1, 20_2, and 20_N preferably process the second predetermined event, initialize the polling time, and return to the sleep mode. As an example of the event, an output of a control signal for lighting of the LED connected to the IoT devices 20_1, 20_2, and 20_N may be mentioned.

2 is a flowchart of a wake-up method of the IoT devices 20_1, 20_2, and 20_N constituting the sensor network 100 according to an exemplary embodiment of the present invention.

For reference, the wake-up method of the IoT devices 20_1, 20_2, and 20_N constituting the sensor network 100 according to the preferred embodiment of the present invention is the sensor network 100 according to the preferred embodiment of the present invention described above. Since it uses, even if there is no separate description, it is a matter of course that all the features of the sensor network 100 are included.

The wake-up method of the IoT devices 20_1, 20_2, and 20_N constituting the sensor network 100 according to an exemplary embodiment of the present invention will be described in detail below with reference to FIG. 2.

Wake-up method of the IoT device (20_1, 20_2, 20_N) according to an embodiment of the present invention, the IoT device (20_1, 20_2, 20_N) booting step (S10); The IoT device (20_1, 20_2, 20_N) is ready (Ready) for receiving the LF (S20); And the IoT device 20_1, 20_2, 20_N entering a sleep state (S30).

In addition, the wake-up method of the IoT device 20_1, 20_2, 20_N according to an exemplary embodiment of the present invention includes: determining whether the preset polling time has expired after step S30 (S40); And processing the predetermined second event (S50) when the preset polling time expires as a result of the determination in step S40. After completion of step S50, the process returns to step S30.

In addition, in the wake-up method of the IoT device 20_1, 20_2, 20_N according to an exemplary embodiment of the present invention, as a result of the determination in step S40, if a preset polling time has not expired, whether to receive a signal in the LF band Determining (S60); As a result of the determination in step S60, when a signal in the LF band is received, the IoT devices 20_1, 20_2, and 20_N wake up in the sleep mode, and the sequence number of the other devices that transmitted the received signal is the IoT devices 20_1, 20_2 , 20_N) (S70) to determine whether it is the preceding sequence number.

As a result of the determination in step S70, if the sequence number of the other device that transmitted the received signal is not the preceding sequence number of the IoT devices 20_1, 20_2, and 20_N, the process returns to step S30.

In addition, in the wake-up method of the IoT device 20_1, 20_2, 20_N according to an exemplary embodiment of the present invention, as a result of the determination in step S70, the sequence number of another device that transmitted the received signal is the IoT device 20_1, 20_2, 20_N), the step of transmitting a signal in the LF band (S80); And processing the predetermined first event (S90). After completion of step S90, the process returns to step S30.

3 shows an explanatory diagram of transmission of a wake-up signal in the entire sensor network 100 according to an exemplary embodiment of the present invention.

As can be seen from FIG. 3, the trigger device 10 that receives an event signal from a remote device transmits a wake-up signal in the LF band through the first LF transmitter 12.

In addition, the plurality of IoT devices 20_1, 20_2, and 20_N enter a sleep mode after booting. The first IoT device 20_1 receives and transmits a wake-up signal from the trigger device 10, and the first Event will be processed.

However, the second IoT device 20_2 waked up by the wake-up signal transmitted from the first IoT device 20_1 transmits a wake-up signal. However, when the first IoT device 20_1 receives the wake-up signal by the second IoT device 20_2, the first IoT device 20_1 is returned to the sleep state by comparing the order of the devices. In addition, the N-th IoT device 20_N waked up by the wake-up signal transmitted from the second IoT device 20_2 transmits a wake-up signal. In addition, when the wakeup signal by the Nth IoT device 20_N is received by the second IoT device 20_2, the second IoT device 20_2 returns to the sleep state by comparison of the sequence numbers of the devices.

As can be seen from FIG. 3, the reverse transmission is not performed, and wake-up for the IoT devices 20_1, 20_2, and 20_N is enabled with low power.

As described above, according to the sensor network 100 of the present invention, the IoT device (20_1, 20_2, 20_N) for the sensor network 100 and the wake-up method of the IoT device (20_1, 20_2, 20_N), IoT The wake-up point of the IoT devices (20_1, 20_2, 20_N) scattered in the sensor network 100 can be specified, and through this, the IoT devices (20_1, 20_2, 20_N) are operated with ultra-low power while real-time information representation You can see that it can be collateralized.

100: sensor network
10: trigger device
20_1, 20_2, 20_N: IoT device
11: first remote receiver
12: 1st LF transmitter
21: second LF receiver
22: second information processing unit
23: second LF transmitter

Claims (16)

In the IoT device,
The IoT device,
A second LF receiver that receives a signal in the LF band;
A second information processing unit processing a signal received by the second LF receiving unit; And
The second LF transmission unit for transmitting a signal in the LF band; includes,
The signal received by the second LF receiver includes a preset sequence number and wakeup signal of another device that has transmitted the signal,
When a signal is received by the second LF receiving unit, the IoT device wakes up in a sleep mode, and the second information processing unit receives the IoT number of another device that has transmitted the signal received by the second LF receiving unit. Determine if it is the front turn of the device,
As a result of the determination of the second information processing unit, when the sequence number of another device that has transmitted the signal received by the second LF reception unit is the forward sequence number of the IoT device, the second LF transmission unit transmits a signal,
The signal transmitted by the second LF transmitter includes the sequence number and wakeup signal of the IoT device,
As a result of the determination of the second information processing unit, if the sequence number of the other device that has transmitted the signal received by the second LF receiver is the preceding sequence number of the corresponding IoT device, the IoT device processes the predetermined first event. , Go back to sleep mode,
As a result of the determination of the second information processing unit, if the sequence number of another device that transmits the signal received by the second LF receiver is not the preceding sequence number of the IoT device, the IoT device returns to the sleep mode. IoT devices. delete delete delete delete delete delete According to claim 1,
The IoT device,
When the preset polling time expires,
The IoT device characterized in that after processing the second predetermined event, the polling time is initialized and the system returns to the sleep mode. A sensor network comprising the IoT device of claim 1. The method of claim 9,
The sensor network,
Trigger device; further comprising,
The trigger device,
The first LF transmission unit for transmitting a signal in the LF band; includes,
The trigger device is a sensor network, characterized in that the most advanced device in comparison with other devices constituting the sensor network. In the wake-up method of the IoT device constituting the sensor network,
(a) receiving a signal in the LF band; And
(b) after completion of the step (a), the IoT device wakes up in a sleep mode, and determining whether the sequence number of another device that has transmitted the signal received in the step (a) is the front sequence number of the IoT device Contains;
As a result of the determination in step (b), if the sequence number of the other device that transmitted the signal received in step (a) is not the preceding sequence number of the IoT device, the IoT device returns to the sleep mode,
In the wake-up method, as a result of the determination in step (b), when the sequence number of another device that transmits the signal received in step (a) is the front sequence number of the IoT device, (c) transmits a signal in the LF band Further comprising;
In the wake-up method, as a result of the determination in step (b), when the sequence number of another device that transmits the signal received in step (a) is a sequence number in front of the corresponding IoT device, (d) a predetermined first event Further comprising; processing;
After completion of the step (d), the IoT device wakes up, characterized in that the sleep mode. delete delete delete delete The method of claim 11,
The wake-up method,
Determining whether a preset polling time has expired; And
And if the preset polling time expires, processing a second predetermined event.

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