KR20160097848A - Operating method for internet to things - Google Patents

Abstract

According to an embodiment of the present invention, a method for operating internet of things is performed in a reference device and an internet-of-things device constituting a group. The method for operating internet of things includes the following steps of: generating local time information of the internet-of-things device; receiving reference time information from the reference device through a local area network; calculating a compensation value for the difference between the reference time information and the local time information when receiving the reference time information; and reflecting the compensation value to the local time information.

Description

{OPERATING METHOD FOR INTERNET TO THINGS}

The present invention relates to a method for operating Internet objects.

With the advancement of wireless network technology and electronic technology, object internet technology that controls objects on network is emerging. This kind of internet technology is applied in such fields as object monitoring, indoor location tracking, and electronic price display.

The most important issue for devices applied to each object in the Internet of things is power management, and it uses wakeup mode and sleep mode for power management.

In such a control, time synchronization between a plurality of devices becomes an important problem. For example, if a plurality of devices are not time synchronized with each other, there may arise a problem that the time to enter the wake-up mode is different or an error occurs in transmission and reception of data packets.

In order to synchronize time, there is a technique of providing time information to a plurality of other devices in a specific device belonging to a group and applying time synchronization in the group. However, this conventional technique has a problem that transmission errors or transmission delays occur in time information.

As another conventional technique for time synchronization, there is a technique in which each device in a group uses a timer individually. However, in such a case, since the time is calculated for each device, there is a problem that it is difficult to secure time synchronization of all devices.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a method for operating a things Internet, which can accurately synchronize time information in the Internet of things with a small amount of resources.

One technical aspect of the present invention proposes an embodiment of a method for Internet operation of things. The object Internet operating method is performed in the object Internet device constituting the reference device and the group. The object Internet operating method includes the steps of generating local time information of the object Internet device, receiving reference time information from a reference device through short-range wireless communication, receiving the local time information at the time of receiving the reference time information, Calculating a correction value for the difference from the reference time information, and reflecting the correction value in the local time information.

Another technical aspect of the present invention proposes another embodiment of a method for Internet operation of things. The object Internet operating method is performed in a reference device that forms a group with a plurality of object internet devices and provides a data packet to the plurality of object internet devices. The object Internet operating method includes: generating reference time information by counting an internal clock; generating a synchronization packet including the reference time information; and transmitting the synchronization packet to the plurality of object Internet devices can do.

The solution of the above-mentioned problems does not list all the features of the present invention. Various means for solving the problems of the present invention can be understood in detail with reference to specific embodiments of the following detailed description.

According to the embodiment of the present invention, time information in the object Internet can be accurately synchronized even with a small amount of resources.

1 is a diagram illustrating an example of an Internet object system according to an embodiment of the present invention.
2 is a configuration diagram showing a reference device according to an embodiment of the present invention.
FIG. 3 is a diagram showing an example of a synchronization packet transmitted from the reference device of FIG. 2. FIG.
FIG. 4 is a block diagram illustrating an object Internet device according to an exemplary embodiment of the present invention. Referring to FIG.
5 is a flowchart illustrating an Internet operation method according to an embodiment of the present invention.
6 is a flowchart illustrating an Internet operation method according to another embodiment of the present invention.
FIG. 7 is a diagram for explaining transmission of a synchronization packet, which is applied in the Internet operation method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

1 is a diagram illustrating an example of an Internet object system according to an embodiment of the present invention.

FIG. 1 shows an example of an object Internet system applied to an electronic shelf system. However, the object Internet system according to an embodiment of the present invention is applicable to various fields such as home appliances such as object monitoring, indoor location tracking, building management, and ZigBee network.

As shown in FIG. 1, the object Internet system may include a plurality of object Internet devices 120, 220 and a reference device 110, 210.

A plurality of object Internet devices 120 and one reference device 110 may form a group 100.

The reference device 110 may send a synchronization packet to the plurality of Internet devices 120 in the group in a near field wireless communication manner so that the Internet devices in the group can perform time synchronization. The reference device 110 may also provide data packets in a short-range wireless communication manner to a plurality of Internet devices 120 in the group to update the data.

Time synchronization can also be achieved between the reference devices 110, 210. For example, the reference devices 110 and 210 can perform time synchronization between the reference devices 110 and 210 by performing time synchronization with servers outside the system such as GPS, NTP, and the like, respectively.

2 is a configuration diagram showing a reference device according to an embodiment of the present invention.

Referring to FIG. 2, the reference device 110 may include a timer 111, a wireless communication unit 112, and a control unit 113.

The timer 111 can generate reference time information by counting the internal clock. The reference time information may be generated at the reference device 110 and provided to a plurality of matter internet devices 120 in the group including the reference device 110. [ Each of the plurality of object Internet devices 120 has local time information, calculates a correction value from the difference between the reference time information and the local time information, and reflects the correction value to perform time synchronization with the reference time information .

The wireless communication unit 112 may configure a short-range wireless communication network with a plurality of the object Internet devices 120. According to an embodiment, a one-way communication network from the bidirectional network or reference device 110 to the toll Internet device 120 may be applied.

The control unit 113 may control the wireless communication unit 112 to generate a data packet and send it to the plurality of object Internet devices 120. [ The data packet may be a packet containing data to be provided to a plurality of object Internet devices 120, for example, data relating to the product price in the case of an electronic shelf system.

The control unit 113 can generate the synchronization packet including the reference time information. The control unit 113 may control the wireless communication unit 112 to send the generated synchronization packet to the plurality of object Internet devices 120. [

In one embodiment, the control unit 113 may control to repeatedly generate and transmit a sync packet for a predetermined number of times after booting up. This is because a plurality of synchronization packets are required to perform the correction in the object Internet device 120. [

In one embodiment, the control unit 113 may repeatedly generate and transmit a sync packet for a predetermined number of times, and then switch to the sleep mode. Thereafter, when the sleep mode is terminated, the control unit 113 can control to generate a new synchronization packet and send it to the plurality of object Internet devices 120.

FIG. 3 is a diagram showing an example of a synchronization packet transmitted from the reference device of FIG. 2. FIG.

As shown, the sync packet may include a header, wakeup information, and reference time information.

The header area of the packet includes header information including a preamble and the like, and the data area may include wakeup information and reference time information.

The wakeup information relates to wakeup information of the object Internet device 120 and the reference time information is the reference time information produced by the timer 111 of the reference device 110. [

FIG. 4 is a block diagram illustrating an object Internet device according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 4, the object Internet device 120 may include a timer 121, a wireless communication unit 122, a correction unit 123, and a control unit 124.

The timer 121 may generate local time information of the object Internet device. The timer 121 may count the internal clock to generate local time information.

The wireless communication unit 122 may form a short-range wireless communication network with the reference device 110. The wireless communication unit 122 can receive the reference time information from the reference device via the short-range wireless communication and provide the received reference time information to the controller 123 and the controller 124. [

In one embodiment, when receiving the synchronization packet from the wireless communication unit 122, the calibration unit 123 can acquire the reference time information in the synchronization packet.

The correcting unit 123 can acquire the local time information when the reference time information is received from the timer 121 and calculate a correction value for the difference between the obtained local time information and the reference time information.

In one embodiment, the calibration unit 123 may generate and store time stamp information associated with local time information and reference time information. For example, the calibration unit 123 may store the local time information local and the reference time information standard in a pair such as (local, standard).

In one embodiment, the corrector 123 can calculate a linear regression function for local time information and reference time information using a plurality of time recording information, and determine a correction value.

For example, the corrector 123 may perform a linear regression on a plurality of preset time recording information to derive a linear regression function for local time information and reference time information as shown in Equation (1) below.

[Equation 1]

Local  = skew  x standard  + offset

A skew value and an offset value can be calculated using a linear regression function using a plurality of time recording information.

The correction unit 123 can correct the correction value by reflecting the correction value calculated in the local time information. For example, the correction unit 123 may reflect the correction value in the local time information provided by the timer 121, and may generate the corrected local time information and provide the corrected local time information to the control unit 124. [

The control unit 124 may control the object Internet device 120 using the local time information corrected by the correction unit 123.

The control unit 124 can control the timer 121 to generate the current local time information upon receipt of the synchronization packet.

In one embodiment, the control unit 124 may control to preferentially process the sync packet. Upon receipt of the packet from the reference device 110, the control unit 124 can confirm the type of the received packet. If the received packet is a synchronous packet, the control unit 124 can control to receive the synchronous packet in preference to the task currently in progress.

In one embodiment, the control unit 124 may control the thing Internet device 120 to be in the sleep mode or the wakeup mode in accordance with the wakeup information included in the synchronization packet.

5 is a flowchart illustrating an Internet operation method according to an embodiment of the present invention. The object Internet operating method shown in FIG. 5 relates to a method for operating the object Internet, which is performed in the reference device 110.

Referring to FIGS. 1 and 5, the reference device 110 may generate reference time information by counting an internal clock (S510).

The reference device 110 may generate a synchronization packet including reference time information (S520), and may transmit the synchronization packet to the plurality of object Internet devices 120. [

In one embodiment, when the reference device 110 is booted up, the reference device 110 repeats the step S510 of generating reference time information for a predetermined number of times or the step S530 of transmitting a synchronization packet .

In one embodiment, the reference device 110 may repeatedly send out a sync packet and then switch to the sleep mode. When the sleep mode ends, the reference device 110 may generate a new sync packet and send it to the plurality of content Internet devices 120.

6 is a flowchart illustrating an Internet operation method according to another embodiment of the present invention. The object Internet operating method shown in FIG. 6 relates to a method of operating a object Internet, which is performed in the object Internet device 120.

Referring to FIGS. 1 and 6, the object Internet device 120 may generate local time information of the object Internet device (S610).

The object Internet device 120 may receive the reference time information from the reference device 110 via short-range wireless communication (S620).

The object Internet device 120 calculates a correction value for the difference between the local time information and the reference time information when the reference time information is received in step S630 and reflects the correction value in the current local time information in step S640, can do.

In one embodiment of step S610, the things Internet device 120 may count the internal clock to generate local time information.

The reference time information may be generated by counting the internal clock of the reference device 110.

In one embodiment of step S620, the object Internet device 120 checks the type of the packet received from the reference device, and if the packet received from the reference device is a synchronous packet, the object Internet device 120 receives the synchronous packet in preference to the task currently in progress The reference time information can be confirmed in the synchronization packet.

In one embodiment, the sync packet may include wakeup information and reference time information.

In one embodiment, the things Internet device 120 can switch modes so that either wake-up mode or sleep mode is applied depending on the wake-up information.

In one embodiment of step S630, the things Internet device 120 may generate and store time stamp information in association with local time information and reference time information. The object internet device 120 can calculate a linear regression function for local time information and reference time information using a plurality of time recording information. The things Internet device 120 can determine a correction value from a linear regression function.

FIG. 7 is a diagram for explaining transmission of a synchronization packet, which is applied in the Internet operation method according to an embodiment of the present invention.

As shown in FIG. 7, the reference device 110 can generate and transmit a synchronization packet for a plurality of times after the initial bootup. The object Internet device 120 may receive a plurality of synchronization packets to calculate a correction value, and may perform time synchronization by reflecting the correction value. Thereafter, when the sleep mode ends, the reference device 110 can generate and transmit a new sync packet. The object internet device 120 can confirm or update the correction value using the received new synchronization packet.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

110: reference device
111: Timer
112:
113:
120: Things Internet Devices
121: Timer
122:
123:
124:

Claims (10)

A method for operating an object Internet, which is performed on a target Internet device constituting a reference device and a group,
Generating local time information of the object Internet device;
Receiving reference time information from a reference device via short-range wireless communication;
Calculating a correction value for a difference between the local time information and the reference time information when the reference time information is received; And
Reflecting the correction value in local time information;
The method comprising the steps of:
2. The method of claim 1, wherein generating the local time information comprises:
Counting an internal clock to generate the local time information;
The method comprising the steps of:
3. The method of claim 2, wherein the reference time information
Wherein the reference clock is generated by counting an internal clock of the reference device.
The method of claim 1, wherein receiving the reference time information comprises:
Confirming a type of a packet received from the reference device;
If the packet received from the reference device is a synchronous packet, processing the synchronous packet prior to a task currently in progress; And
Checking the reference time information in the synchronization packet;
The method comprising the steps of:
5. The method of claim 4,
Wakeup information, and the reference time information.
6. The method according to claim 5,
And switching the mode so that either the wakeup mode or the sleep mode is applied according to the wakeup information.
2. The method of claim 1, wherein calculating the correction value comprises:
Generating and storing time recording information associated with the local time information and the reference time information;
Calculating a linear regression function for the local time information and the reference time information using a plurality of the time recording information; And
Determining the correction value from the linear regression function;
The method comprising the steps of:
There is provided a method for operating an object Internet operating in a reference device for forming a group with a plurality of object internet devices and providing a data packet to the plurality of object internet devices,
Counting an internal clock to generate reference time information;
Generating a synchronization packet including the reference time information; And
Sending the synchronization packet to the plurality of object Internet devices;
The method comprising the steps of:
9. The method of claim 8,
If the reference device is booted up, repeating the step of generating the reference time information for a predetermined number of times or transmitting the synchronization packet;
Further comprising the steps of:
The method as claimed in claim 9,
Switching the sleep mode after repeatedly sending out the synchronization packet; And
Generating a new synchronization packet when the sleep mode is terminated and sending the generated synchronization packet to the plurality of object Internet devices;
Further comprising the steps of:

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