KR20160004762A - Apparatus and method for data rate alteration in duplex low-power wireless communication - Google Patents

Apparatus and method for data rate alteration in duplex low-power wireless communication Download PDF

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KR20160004762A
KR20160004762A KR1020140083690A KR20140083690A KR20160004762A KR 20160004762 A KR20160004762 A KR 20160004762A KR 1020140083690 A KR1020140083690 A KR 1020140083690A KR 20140083690 A KR20140083690 A KR 20140083690A KR 20160004762 A KR20160004762 A KR 20160004762A
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South Korea
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data transmission
transmission rate
acknowledgment signal
signal
current data
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KR1020140083690A
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Korean (ko)
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김완수
조인호
서정식
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삼성전기주식회사
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Publication of KR20160004762A publication Critical patent/KR20160004762A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a method and an apparatus for changing a data rate in bidirectional low power wireless communications. According to an embodiment of the present invention, the apparatus comprises: a signal transmission unit for transmitting, to an external communications device, an acknowledge signal at the current data rate; a response signal reception unit for receiving a response signal when the external communications device transmits the response signal since the acknowledge signal can be received; and a data rate change unit for reducing the current data rate when the response signal is not received.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for changing a data transmission rate in an interactive low-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for changing a data rate in two-way low-power wireless communication.

In general, bi-directional low power wireless communication is now widely used in the field where it can process simple things wirelessly from short distance. For example, the electronic price display system is an electronic display system in place of a paper ticket that displays information (for example, price) of goods on a merchandise shelf in a store. The electronic price display system can use a display device (such as an LCD or electronic paper) as a means for visually displaying information of a product, and a communication means for receiving and processing data having changed product information.

Zigbee is widely used in bi-directional low-power wireless communication, and the bandwidth is narrowed to 5MHz and the data transmission rate is also low at 250kbps for low power wireless communication, which is the most important characteristic of Zigbee.

However, recently, in the field where two-way low power wireless communication is used, there is a demand for a technology capable of transmitting and receiving large data in a short time. For example, if the terminal is a large display device or the terminal is too large, the transmission / reception of data is too slow at the data transmission rate of the Zigbee.

Therefore, even in the case of bidirectional low power wireless communication, it is necessary to increase the data transmission speed in some cases. However, as the data transmission speed is increased, the receiving sensitivity is drastically lowered, so that the reception success rate of the external communication device drops sharply. In order to solve the above problem, it is possible to increase the output power simply. However, since power is supplied using a portable battery in a bidirectional low-power wireless communication, increased power consumption may be a fatal drawback.

Due to these constraints and requirements, there is a need for a way to change the data rate on a case-by-case basis in two-way low power wireless communications.

The following Patent Documents 1 and 2 are related to a data transmission rate control method for a forward communication channel and are not bi-directional low power wireless communication. Therefore, contents for changing a data transmission rate according to whether or not a signal can be received in an external communication apparatus are disclosed I do not know.

KR 2002-0093325 A JP 2000-124913 A

In order to solve the problems described above, an embodiment of the present invention utilizes a feature of a bidirectional low-power wireless communication to change a data transmission rate according to whether a signal is received in an external communication device, A < / RTI >

According to one technical aspect of the present invention, an external communication apparatus can transmit an acknowledge signal at a current data transmission rate, and the external communication apparatus can receive an acknowledge signal The data transmission rate change in the bidirectional low power wireless communication capable of receiving the response signal when transmitting a response signal and capable of reducing the current data transmission rate when the response signal is not received Apparatus and method.

In addition, when the response signal is not received, the transmitter may transmit the acknowledgment signal again at the same data transmission rate or at a reduced data transmission rate.

In addition, the initial data transmission rate can be set to the highest speed, and the current data transmission rate can be sequentially reduced.

When the acknowledgment signal is not received, in order to repeatedly transmit the acknowledgment signal for the same data transmission rate a predetermined number of times or for a predetermined period of time, the number of transmissions or the required time of the acknowledgment signal for the same data transmission rate is counted can do.

The predetermined number of times or the time may vary depending on the number of times the current data transmission rate is reduced.

Also, after changing the initial data transmission rate, it is possible to compare whether the current data transmission rate is the lowest.

Also, the external communication device may be a plurality of electronic price indicators in the electronic price display system.

It is possible to minimize the reception failure in the external communication apparatus while communicating at a high data transmission rate. In addition, it is possible to communicate with the external communication device at an average high data transmission rate without increasing the output power. Further, there is an effect that it is possible to cope flexibly with a changing communication environment in two-way low power wireless communication.

1 is a conceptual diagram illustrating an apparatus for changing a data transmission rate according to a reception sensitivity according to an embodiment of the present invention.
2 is a flowchart illustrating a method of changing a data transmission rate according to a reception sensitivity according to an embodiment of the present invention.
3 is a schematic block diagram of an electronic price display system to which the present invention can be applied.
4 is a schematic diagram showing a communication range with an electronic price indicator according to a data transmission rate of a gateway in an electronic price display system to which the present invention can be applied.
5 is a table showing reception sensitivity corresponding to a data transmission rate of a repeater in an electronic price display system to which the present invention can be applied.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order that those skilled in the art can easily carry out the present invention.

1 is a conceptual diagram illustrating an apparatus for changing a data transmission rate according to a reception sensitivity according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for changing a data transmission rate according to an embodiment of the present invention includes: (a) a transmitter 110; (b) a receiver 120; (c) (D) a counting unit 140, and (e)

The transmission unit 110 can transmit an acknowledgment signal to the external communication device. Here, the Acknowledge signal may be a signal sent to the external communication device to confirm whether the current data transmission rate is optimal for the communication environment before transmitting the data to the external communication device.

The receiving unit 120 may receive a response signal from the external communication device. Here, the response signal of the external communication device may be a signal to notify the external communication device of information that the external communication device can receive the acknowledgment signal when the external communication device receives the acknowledgment signal . When receiving the response signal, it is determined that the current data transmission speed is the optimum data transmission speed for the communication environment, and data can be transmitted / received to / from the external communication device while maintaining the current data transmission speed.

The data transmission rate changing unit 130 may reduce the current data transmission rate if the response signal is not received. If the data transmission rate is reduced, the external communication device becomes physically easy to receive the signal. That is, since the reception sensitivity is improved, the reception success rate of the external communication apparatus increases. Accordingly, it is possible to determine whether the reduced data transmission rate is the optimum data transmission rate by repeating the above processes.

If the response signal is not received, the counting unit 140 can confirm whether the acknowledgment signal for the same data transmission rate is transmitted n times. When the acknowledgment signal is transmitted less than n times, transmission of the acknowledgment signal can be repeated.

If the acknowledgment signal for the same data transmission rate is transmitted n times, the comparison unit 150 can determine whether the current data transmission rate is the lowest. Here, the lowest speed may be the slowest data transmission rate that can be set. If the data transmission speed is the slowest, the reception sensitivity is the best, and the reception rate of the external communication device is the highest. It is not necessary to determine whether the current data transmission speed is the optimum data transmission speed when the data transmission speed is reduced to the minimum speed so that data can be transmitted to and received from the external communication device while maintaining the current data transmission speed .

Here, if the response signal is not received, the transmission unit 110 may transmit the acknowledgment signal again at the same data transmission rate or at a reduced data transmission rate. That is, it is possible to repeatedly transmit data up to n times at the same data transmission rate, and in the case of repeating n times or more, the data transmission rate can be reduced and the acknowledgment signal can be transmitted again.

If the data transmission rate that can be set is two, the transmission unit 110 may not transmit the acknowledgment signal again after decreasing the data transmission rate.

On the other hand, if the data transmission rate that can be set is three or more, the data transmission rate changing unit 130 can set the initial data transmission rate at the highest speed and sequentially decrease it. That is, by repeating the reduction of the data transmission rate and the transmission of the acknowledgment signal, it is possible to select a data transmission rate optimum for the communication environment among various data transmission rates.

Here, repeatedly transmitting the acknowledgment signal for the same data transmission rate up to n times means that even though the current data transmission speed is the optimum data transmission speed, The communication device may not be able to receive the acknowledgment signal. Therefore, if the acknowledgment signal is transmitted repeatedly up to n times, there is an effect that the optimum data transmission rate can be selected more accurately.

As the number of times of repeated transmission of the acknowledgment signal increases, the optimum data transmission rate can be more accurately selected. However, the power and time required for transmitting the acknowledgment signal may be unnecessarily increased. Therefore, the number of times that the acknowledgment signal is repeatedly transmitted can be selected in consideration of the above factors.

The number of times the acknowledgment signal is repeatedly transmitted may vary depending on the number of times the data transmission rate is changed. If the data transmission rate is changed at least once, it may be efficient to reduce unnecessary repeated transmission of the acknowledgment signal. It is effective to set the number of times of repeatedly transmitting the acknowledgment signal to be different from each other because the frequency of the temporal decrease in the communication environment and the signal collision between the plurality of communication apparatuses may vary depending on the current data transmission speed.

Also, instead of repeatedly transmitting the acknowledgment signal for the same data transmission rate up to n times, it is possible to repeatedly transmit for a predetermined time. It may be because the current data transmission speed is the optimum data transmission speed but the external communication device may not receive the acknowledgment signal for a certain time due to a flexible communication environment and the location and state of the external communication device. Therefore, if the acknowledgment signal for the same data transmission rate is repeatedly transmitted for a predetermined time, the optimum data transmission rate can be selected more accurately.

The longer the time for repeatedly transmitting the acknowledgment signal, the more accurately the optimum data transmission rate can be selected, but the power and time required for transmitting the acknowledgment signal may be unnecessarily increased. Therefore, the number of times that the acknowledgment signal is repeatedly transmitted can be selected in consideration of the above factors.

The time for repeatedly transmitting the acknowledgment signal may vary depending on the number of times the data transmission rate is changed. If the data transmission rate is changed at least once, it may be efficient to reduce unnecessary repeated transmission of the acknowledgment signal. It is effective to set the number of times of repeated transmission of the acknowledgment signal to be different because a flexible communication environment according to the current data transmission speed and a required time depending on the position and state of the external communication apparatus can be changed.

2 is a flowchart illustrating a method of changing a data transmission rate according to a reception sensitivity according to an embodiment of the present invention.

Referring to FIG. 2, the method for changing the data transmission rate according to the reception sensitivity according to the first embodiment of the present invention includes the steps of: (a) setting an initial data transmission rate at the highest speed (S210); (b) (C) receiving a response signal from the external communication device (S230); and (d) checking whether the acknowledgment signal for the same data transmission rate is transmitted n times Step (S240), (e) checking whether the current data transmission speed is the lowest speed (S250), and (f) decreasing the current data transmission speed (S260).

In step (a) (S210), the initial data transmission rate can be set to the highest speed. Here, the maximum rate may be the highest data rate that can be set. If the data transmission speed is the fastest, it is possible to transmit the greatest amount of data during the same time, so it is advantageous to transmit large data quickly, but the external communication device is most difficult to physically receive the signal. That is, since the reception sensitivity is the lowest, the reception success rate of the external communication apparatus is the lowest.

In the step (b) (S220), an acknowledgment signal may be transmitted to the external communication device. Here, the Acknowledge signal may be a signal sent to the external communication device to confirm whether the current data transmission speed is the optimal data transmission speed before transmitting the data to the external communication device.

In step (c) (S230), a response signal of the external communication apparatus can be received. Here, the response signal of the external communication device may be a signal to notify the external communication device of information that the external communication device can receive the acknowledgment signal when the external communication device receives the acknowledgment signal . When receiving the response signal, it is determined that the current data transmission speed is the optimum data transmission speed, and data can be transmitted / received to / from the external communication device while maintaining the current data transmission speed.

In step (d) (S240), if the response signal is not received, it is possible to confirm whether the acknowledgment signal for the same data transmission rate is transmitted n times. If the acknowledgment signal is transmitted less than n times, step (b) (S220) and step (c) (S230) may be repeated.

In step (e) (S250), if the acknowledgment signal for the same data transmission rate is transmitted n times, it can be confirmed whether the current data transmission rate is the lowest. Here, the lowest speed may be the slowest data transmission rate that can be set. It is not necessary to determine whether the current data transmission speed is the optimum data transmission speed when the data transmission speed is reduced to the minimum speed so that data can be transmitted to and received from the external communication device while maintaining the current data transmission speed .

In step (f) (S260), if the current data transmission speed is not the lowest speed, the current data transmission speed can be reduced. If the data transmission rate is reduced, the external communication device becomes physically easy to receive the signal. That is, since the reception sensitivity is improved, the reception success rate of the external communication apparatus increases. Therefore, it is possible to determine whether the changed data transmission rate is the optimal transmission rate by repeating the step (b) (S220).

In the step (a), when the response signal is not received, the acknowledgment signal may be transmitted again at the same data transmission rate or at a reduced data transmission rate. That is, it is possible to repeatedly transmit data up to n times at the same data transmission rate, and in the case of repeating n times or more, the data transmission rate can be reduced and the acknowledgment signal can be transmitted again.

If the set data transmission speed is two, the data transmission rate may be reduced in step (a) (S210), and then the acknowledgment signal may not be transmitted again.

On the other hand, if the set data transmission speed is three or more, the initial data transmission rate may be set at the highest speed and sequentially decreased in step (f) (S260). That is, by repeating the reduction of the data transmission rate and the transmission of the acknowledgment signal, it is possible to select a data transmission rate optimum for the communication environment among various data transmission rates.

Here, repeatedly transmitting the acknowledgment signal for the same data transmission rate up to n times means that even though the current data transmission speed is the optimum data transmission speed, The communication device may not be able to receive the acknowledgment signal. Therefore, if the acknowledgment signal is transmitted repeatedly up to n times, there is an effect that the optimum data transmission rate can be selected more accurately.

As the number of times of repeated transmission of the acknowledgment signal increases, the optimum data transmission rate can be more accurately selected. However, the power and time required for transmitting the acknowledgment signal may be unnecessarily increased. Therefore, the number of times that the acknowledgment signal is repeatedly transmitted can be selected in consideration of the above factors.

The number of times the acknowledgment signal is repeatedly transmitted may vary depending on the number of times the data transmission rate is changed by performing step S260. When performing step (f) (S260) at least once, it may be efficient to reduce unnecessary repeated transmission of the acknowledgment signal. It is effective to set the number of times of repeatedly transmitting the acknowledgment signal to be different from each other because the frequency of the temporal decrease in the communication environment and the signal collision between the plurality of communication apparatuses may vary depending on the current data transmission speed.

Also, instead of repeatedly transmitting the acknowledgment signal for the same data transmission rate up to n times, it is possible to repeatedly transmit for a predetermined time. It may be because the current data transmission speed is the optimum data transmission speed but the external communication device may not receive the acknowledgment signal for a certain time due to a flexible communication environment and the location and state of the external communication device. Therefore, if the acknowledgment signal is transmitted repeatedly up to n times, there is an effect that the optimum data transmission rate can be selected more accurately.

The longer the time for repeatedly transmitting the acknowledgment signal, the more accurately the optimum data transmission rate can be selected, but the power and time required for transmitting the acknowledgment signal may be unnecessarily increased. Therefore, the number of times that the acknowledgment signal is repeatedly transmitted can be selected in consideration of the above factors.

In addition, the time for repeatedly transmitting the acknowledgment signal may vary according to the number of times the data transmission rate is changed by performing step (f) (S260). When performing step (f) (S260) at least once, it may be efficient to reduce unnecessary repeated transmission of the acknowledgment signal. It is effective to set the number of times of repeated transmission of the acknowledgment signal to be different because a flexible communication environment according to the current data transmission speed and a required time depending on the position and state of the external communication apparatus can be changed.

An electronic price display system to which the present invention can be applied will be described in detail with reference to FIG.

3 is a schematic block diagram of an electronic price display system to which the present invention can be applied.

3, an electronic price display system to which the present invention is applied may include a server 30, a gateway 20, and an electronic price indicator 10.

The server 30 can manage the status information of a plurality of electronic price indicators existing in the network to which the server 30 belongs and send the goods information to the relay device 20. [

The repeater 20 can perform a wire / wireless conversion function between the server 30 and the electronic price indicator 10 and transmits the product information received from the server 30 to the electronic price indicator 10, Lt; / RTI >

That is, the repeater 20 converts a wire signal from the server 30 into a wireless signal and wirelessly transmits the wireless signal to the electronic price indicator 10, and transmits the wireless signal from the electronic price indicator 10 to the wire signal To the server 30 by wire.

The repeater 20 and the electronic price indicator 10 may follow the Zigbee standard wireless communication protocol. The most significant feature of the Zigbee is that it can perform wireless communication with low power and enable bidirectional communication. Therefore, it can be used in an electronic price indication label to which the present invention can be applied.

The repeater 20 and the electronic price indicator 10 may follow a non-standard communication algorithm other than the Zigbee standard wireless communication protocol. Therefore, the data rate of the repeater 20 may be various data rates such as 500 kbps, 1 Mbps, 2 Mbps in addition to 250 kbps of the Zigbee.

4 is a schematic diagram showing a communication range with an electronic price indicator according to a data transmission rate of a repeater in an electronic price display system to which the present invention can be applied.

In general, the faster the data transmission rate, the more efficient it is to communicate large data. However, as the data transmission rate increases, the reception sensitivity decreases significantly, so that the spatial range of the electronic price indicator 10 to which the repeater 20 can communicate is reduced. For example, when the distance between the repeater 20 and the electronic price indicator 10 is close to each other, communication may be possible even if the data transmission rate is increased to the maximum speed. However, when the distance between the repeater 20 and the electronic price indicator 10 is long, communication may not be smooth at the fastest data transmission speed, so that the data transmission speed is reduced to facilitate communication with each other . Here, the closer the distance between the repeater 20 and the electronic price indicator 10, the more efficient it is to communicate at a lower data rate.

An embodiment of the present invention may be suitable for applying to the electronic price display system.

5 is a table showing reception sensitivity corresponding to a data transmission rate of a repeater in an electronic price display system to which the present invention can be applied.

The reception sensitivity of the Zigbee data transmission rate of 250 kbps and the reception sensitivity of 2 Mbps differ by about 9 dB. That is, if the data transmission speed is increased by 8 times, the reception sensitivity is reduced by 8 times.

That is, the reception sensitivity corresponds to the current data transmission rate of the reception acknowledgment signal, and whether or not the reception acknowledgment signal is received may vary according to the reception sensitivity in the bidirectional low power wireless communication.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Anyone can make various variations.

10: Electronic price indicator
20: Repeater
30: Server
100: Data transfer rate changing device
110:
120: Receiver
130: Data transmission rate changing section
140:
150:

Claims (15)

A transmitter for transmitting an acknowledgment signal to the external communication device at a current data rate;
A receiving unit for receiving the response signal when the external communication apparatus transmits the response signal by being able to receive the acknowledgment signal; And
A data transmission rate changing unit for decreasing the current data transmission rate when the response signal is not received; / RTI > The apparatus of claim < RTI ID = 0.0 > 1, < / RTI >
The method according to claim 1,
Wherein the transmission unit resends the acknowledgment signal at the same data transmission rate or at a reduced data transmission rate when the response signal is not received, in the bi-directional low power wireless communication.
The method according to claim 1,
Wherein the data transmission rate changing unit sets the initial data transmission rate at a highest speed and sequentially reduces the data transmission rate.
The method according to claim 1,
Further comprising a counting unit for counting the number of times of transmission of the acknowledgment signal for the same data transmission rate or the time required from the first transmission of the acknowledgment signal for the same data transmission rate, in a bidirectional low- Change device.
5. The method of claim 4,
Wherein the data transmission rate changing unit decreases the current data transmission rate only when the value of the counting unit is equal to or greater than a predetermined value,
Wherein the constant value of the counting unit varies depending on the number of times of decreasing the current data transmission rate.
The method according to claim 1,
Further comprising a comparison unit for comparing the current data transmission rate with the lowest data transmission rate in the data transmission rate changing unit.
The method according to claim 1,
Wherein the external communication device comprises a plurality of electronic price indicators in an electronic price display system.
Transmitting an acknowledgment signal to the external communication device at a current data rate;
Receiving the response signal when the external communication device is capable of receiving the acknowledgment signal and transmitting a response signal; And
Decreasing the current data transmission rate if no response signal is received; / RTI > The method of claim 1, wherein the data transmission rate is changed in two-way low power wireless communication.
9. The method of claim 8,
Wherein the transmitting step resends the acknowledgment signal at the same data transmission rate or at a reduced data transmission rate when there is no reception of the acknowledgment signal in the two-way low power wireless communication.
9. The method of claim 8,
Further comprising the step of setting the initial data transmission rate to the highest speed,
Wherein changing the current data transmission rate comprises sequentially decreasing the current data transmission rate.
9. The method of claim 8,
When the acknowledgment signal is not received in the step of receiving the acknowledgment signal, in order to repeatedly transmit the acknowledgment signal for the same data transmission rate a predetermined number of times, the number of times of transmission of the acknowledgment signal for the same data transmission rate The method further comprising the step of verifying the data transmission rate in the bidirectional low power wireless communication.
9. The method of claim 8,
If the acknowledgment signal is not received in the step of receiving the acknowledgment signal, in order to repeatedly transmit the acknowledgment signal for the same data transmission rate for a predetermined time, Further comprising the step of counting the time required for the data transmission rate change in the bidirectional low power wireless communication.
13. The method according to claim 11 or 12,
Wherein the predetermined number of times or the predetermined time varies depending on the number of times the current data transmission rate is changed.
9. The method of claim 8,
Further comprising comparing the current data transmission rate to the lowest data rate after reducing the initial data transmission rate in the step of reducing the current data transmission rate.
9. The method of claim 8,
Wherein the external communication device comprises a plurality of electronic price indicators in an electronic price display system.
KR1020140083690A 2014-07-04 2014-07-04 Apparatus and method for data rate alteration in duplex low-power wireless communication KR20160004762A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180029557A (en) * 2016-09-13 2018-03-21 에스케이텔레콤 주식회사 Networlk device and control method thereof
KR20200015210A (en) * 2018-08-03 2020-02-12 에스케이텔레콤 주식회사 Method and apparatus for long range network service, and method for communication of long range network terminal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180029557A (en) * 2016-09-13 2018-03-21 에스케이텔레콤 주식회사 Networlk device and control method thereof
KR20200015210A (en) * 2018-08-03 2020-02-12 에스케이텔레콤 주식회사 Method and apparatus for long range network service, and method for communication of long range network terminal

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