KR102099005B1 - Relay device based on cognitive radio communication, UAV for including the same, and Relay method based on cognitive radio communication using the UAV - Google Patents

Abstract

Disclosed is a cognitive wireless communication-based relay device, an unmanned aerial vehicle including the same, and a cognitive wireless communication-based relay method using the unmanned aerial vehicle. The disclosed relay device is a relay device attached to the unmanned aerial vehicle, a communication unit for sensing a channel near the space where the unmanned aerial vehicle is located, and performing data communication with an external device; And controlling the communication unit, calculating a location where a frequency resource that can be used is the maximum based on the channel sensing result, and managing the calculated location through the communication unit when the unmanned aerial vehicle is present in the calculated location. Containing a base station and the cognitive radio communication based channel use negotiation; includes, but, when occupying the frequency resource A through the channel use negotiation, the control unit to provide a short-range wireless communication signal using the frequency resource A Control.

Description

Cognitive wireless communication-based relay device and unmanned aerial vehicle including the same, and relay device based on cognitive radio communication, UAV for including the same, and relay method based on cognitive radio communication using the unmanned aerial vehicle using the UAV}

Embodiments of the present invention relates to a cognitive wireless communication-based relay device for improving a user's transmission rate located at a cell boundary, an unmanned aerial vehicle including the same, and a cognitive wireless communication-based relay method using the unmanned aerial vehicle.

With the rapid development of various wireless communication technologies, radio frequency resources in the frequency band of a few GHz band, especially in the frequency band of 6 GHz or less, which have excellent propagation characteristics, are mostly allocated and used, causing a problem of exhaustion of radio frequency resources. Accordingly, interest in Cognitive Radio (CR) communication, which is a wireless communication method for effectively using frequency resources (channels), is increasing.

Cognitive wireless communication is a communication method in which the same frequency resource is shared and used by a primary user (PU) and a cognitive user / secondary user (CU / SU). Here, the priority user refers to a person or device that has been given the right to use the channel, and the next priority user refers to a person or device without the right to use the channel.

That is, cognitive wireless communication is a communication technology for maximizing the use efficiency of radio frequency resources by increasing the use rate of the channel, and the next user is empty when the priority user who is given the right to use the channel is not using the channel. By using the channel to enable wireless communication, the efficiency of use of the channel is increased.

Meanwhile, a user located at the cell boundary has a low transmission rate, and there are three techniques for increasing it.

First, Inter-Cell Interference Coordination (ICIC) is a technology defined in 3GPP release 8, and reduces interference between cells by using different frequency domains at the cell boundary between adjacent cells.

Next, eICIC (Enhanced Inter-Cell Interference Coordination) is a technology defined in 3GPP release 10, and is a technology that tailors ICIC to the HetNet environment. eICIC uses different time domains (i.e., sub-frames) to reduce inter-cell interference, and can be used in HetNet, which uses Macro cells and Small cells together.

Finally, CoMP (Coordinated Multi-Point) is a technology defined in 3GPP releases 11 and 12, and performs beamforming (Beamforming) using an antenna or bundles several cells together to operate as a virtual MIMO system. CoMP is largely divided into four technologies.

CS (Coordinated Scheduling) is a technology in which channel information is transmitted in units of users and users allocate different frequency resources. Similar to ICIC, but more sophisticated and faster.

Coordinated Beamforming (CB) is a technique for allocating different spatial resources (ie, beam patterns) to users using a smart antenna technology. Main beam is assigned to a user in a cell, and a null beam is assigned to a neighboring cell user to prevent interference.

Joint transmission (JT) is a technology in which multiple cells simultaneously transmit one data using the same radio resource. Since data is received in duplicate, reception performance is improved.

In DPS (Dynamic Point Selection), multiple cells transmit one data at the same time, but the user receives data from a cell having a better channel state.

However, since ICIC and eICIC aim to reduce interference between users, the effect of increasing a user's transmission rate is insufficient.

In addition, CoMP has an advantage of increasing a user's transmission rate, but since a fixed base station is used, there may be a location where CoMP cannot be used depending on a distance, and terminal devices that do not support CoMP cannot use the corresponding technology. The disadvantage is that cooperation between base stations installed by other mobile operators is impossible.

Republic of Korea Patent Publication No. 10-2017-0027368

In order to solve the problems of the prior art as described above, in the present invention, a cognitive wireless communication-based relay device for improving the transmission rate of a user located at a cell boundary and an unmanned aerial vehicle including the same, and cognitive wireless communication using the unmanned aerial vehicle I would like to propose a method of relaying based.

Other objects of the present invention may be derived by those skilled in the art through the following examples.

According to a preferred embodiment of the present invention to achieve the above object, the relay device attached to the unmanned aerial vehicle, comprising: a communication unit for sensing a channel near the space where the unmanned aerial vehicle is located, and performing data communication with an external device; And controlling the communication unit, calculating a location where a frequency resource that can be used is the maximum based on the channel sensing result, and managing the calculated location through the communication unit when the unmanned aerial vehicle is present in the calculated location. Containing a base station and the cognitive radio communication based channel use negotiation; includes, but, when occupying the frequency resource A through the channel use negotiation, the control unit to provide a short-range wireless communication signal using the frequency resource A There is provided a relay device characterized in that the control.

When a priority user wants to use the frequency resource A, the communication unit senses the traffic transmitted by the priority user through the frequency resource A for a preset time, and the control unit analyzes the pattern of the sensed traffic And, it is possible to control the use of the frequency resource A based on the analyzed traffic pattern.

When the size of the traffic is greater than a preset reference size and the throughput of the traffic is greater than a preset reference throughput, the control unit controls not to transmit and receive data using the frequency resource A for a preset time, and the preset time After this, the traffic pattern can be re-analyzed.

When the traffic is periodic, the size of the traffic is greater than a preset reference size, and the throughput of the traffic is less than a preset reference throughput, the control unit may control to operate in an overlay mode.

When the traffic is periodic, the size of the traffic is smaller than a preset reference size, and the throughput of the traffic is smaller than a preset reference throughput, the control unit controls to operate in an overlay mode or to operate in an underlay mode. Can be controlled.

When the traffic is aperiodic, and the size of the traffic is greater than a preset reference size, and the throughput of the traffic is smaller than a preset reference throughput, the controller may control to operate in an underlay mode.

When the traffic is aperiodic and the size of the traffic is smaller than a preset reference size, the controller may control to operate in an underlay mode.

In a case where it is not possible to determine whether the traffic is periodic or aperiodic within the preset time, or when it is not possible to determine the size of the traffic, the controller, if the throughput of the traffic is greater than the preset reference throughput, Controls not to transmit or receive data using the frequency resource A for a set time, re-analyzes the traffic pattern after the preset time, and when the throughput of the traffic is less than a preset reference throughput, enters an underlay mode. It can be controlled to work.

In addition, according to another embodiment of the present invention, in an unmanned aerial vehicle, a driving unit for controlling the driving of the unmanned aerial vehicle; And a relay unit that provides a short-range wireless communication signal based on cognitive wireless communication, wherein the relay unit senses a channel near the space where the unmanned aerial vehicle is located and performs data communication with an external device. And controlling the communication unit, calculating a location where a frequency resource that can be used is the maximum based on the channel sensing result, and managing the calculated location through the communication unit when the unmanned aerial vehicle is present in the calculated location. Containing a base station and the cognitive radio communication based channel use negotiation; includes, but, when occupying the frequency resource A through the channel use negotiation, the control unit to provide a short-range wireless communication signal using the frequency resource A A drone characterized by controlling is provided.

In addition, according to another embodiment of the present invention, a method for performing relay based on cognitive wireless communication using an unmanned aerial vehicle, comprising: sensing a channel near a space in which the unmanned aerial vehicle is located; Calculating a position at which a frequency resource that can be used is the maximum based on the channel sensing result; If the unmanned aerial vehicle is present at the calculated location, performing a channel use negotiation based on cognitive radio communication with a base station managing the calculated location; And providing a short-range wireless communication signal using the frequency resource A when occupying the frequency resource A through the channel use negotiation.

According to the present invention, there is an advantage of using the unmanned aerial vehicle to improve the transmission rate of the user located at the cell boundary through cognitive wireless communication.

1 is a diagram showing a schematic configuration of a cognitive wireless communication based communication network according to an embodiment of the present invention.
2 is a view showing a schematic configuration of a drone according to an embodiment of the present invention.
3 is a flowchart illustrating a method for performing relay based on cognitive wireless communication according to an embodiment of the present invention.
4 is a view for explaining a configuration in which the unmanned aerial vehicle according to the present invention provides a WIFI signal.
5 is a flowchart illustrating an operation of an unmanned aerial vehicle using frequency resource A when a priority user wants to use occupied frequency resource A according to an embodiment of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing each drawing, similar reference numerals are used for similar components.

Terms such as "first", "second", etc. can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may also be referred to as a first component. The term “and / or” includes a combination of a plurality of related described items or any one of a plurality of related described items.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing a schematic configuration of a cognitive wireless communication based communication network according to an embodiment of the present invention.

Referring to FIG. 1, the communication network 100 includes a macro base station 120 that manages one cell 110 and at least one small cell that manages the vicinity of the boundary of the cell 110. ) A base station 130, an unmanned aerial vehicle (UAV) 140, and a user terminal device 150.

Here, the unmanned aerial vehicle 140 may be, for example, a drone, and serves as a repeater. That is, the unmanned aerial vehicle 140 serves as a mobile repeater capable of freely changing the location, acquires frequency resources from the small cell base station 130 managing the point where the unmanned aerial vehicle 140 is located, and acquires the frequency Provides a short-range wireless communication signal (eg, WIFI signal) based on a resource. At this time, the unmanned aerial vehicle 140 may acquire frequency resources based on cognitive radio (CR) communication. The user terminal device 150 may be communicatively connected to the macro base station 120 through a cellular or WIFI shared by the unmanned aerial vehicle 140.

Hereinafter, the configuration of the unmanned aerial vehicle 140 and the cognitive wireless communication based relay method using the same will be described in more detail.

2 is a view showing a schematic configuration of a drone 140 according to an embodiment of the present invention.

Referring to FIG. 2, the unmanned aerial vehicle 140 includes a driving unit 141 and a relay unit 142.

The driving unit 141 controls driving of the unmanned aerial vehicle 140. The drone 140 may change its position according to the operation of the driving unit 141.

The relay unit 142 may be configured as one separate device attached to the unmanned aerial vehicle 140, and provides a short-range wireless communication signal to the user terminal device 150 based on cognitive wireless communication.

Here, the relay unit 142 includes a communication unit 142A and a control unit 142B.

The communication unit 142A senses a channel near the space where the unmanned aerial vehicle 140 is located, and performs data communication with an external device. In addition, the channel use negotiation described below is also performed through the communication unit 142A.

In addition, in order to perform channel sensing, channel use negotiation, and data communication together, the communication unit 142A may be implemented in the form of a multi-transceiver. That is, one of the multi-transceivers may perform a channel sensing operation, and the other transceiver may perform a data communication and channel use negotiation process.

The control unit 142B may be a device or a module including a processor, and controls the communication unit 142A, and plays a key role for providing a short-range wireless communication signal.

Hereinafter, a method of relaying based on cognitive wireless communication using the unmanned aerial vehicle 140 will be described in detail with reference to FIG. 3.

3 is a flowchart illustrating a method for performing relay based on cognitive wireless communication according to an embodiment of the present invention. At this time, the method may be performed in the unmanned aerial vehicle 140, more precisely, the relay unit 142 attached to or included in the unmanned aerial vehicle 140. Hereinafter, a process performed for each step will be described.

First, in step 310, the unmanned aerial vehicle 140 existing in a specific location (space) senses a nearby channel (spectrum). This may be performed through the communication unit 142A, and the sensing operation may be continuously performed. And, through the sensing operation, the control unit 142B can analyze the available frequency resources, and the available frequency resources can be analyzed through energy detection.

Next, in step 320, a position where the frequency resource that can be used is the maximum is calculated based on the channel sensing result. This may be performed through the control unit 142B. That is, through step 320, the unmanned aerial vehicle 140 can find a location with many available frequency resources and move to the corresponding location.

Subsequently, in step 330, when the unmanned aerial vehicle 140 is present in the calculated position, a channel use negotiation based on cognitive wireless communication is performed with a base station managing the calculated position. This may be performed through the communication unit 142A and the control unit 142B.

Cognitive wireless communication is a communication method that allows the same frequency resource to be shared and used by a priority user (PU: Primary User) and a secondary user (CU / SU: Cognitive User / Secondary User). It is a communication method that can increase the efficiency of use of the channel by allowing the next priority user to perform wireless communication at a time when the given priority user does not use the channel. Therefore, the unmanned aerial vehicle 140 performs channel use negotiation as a next-order user of cognitive radio communication, and thus can occupy frequency resource A.

For example, in step 330, channel use negotiation may be performed using RTS / CTS control (Request_To_Send / Clear_To_Send_Control). RTS / CTS is a communication mechanism that can be selectively used in the 802.11 wireless network protocol, and is used to prevent frame collision.

Finally, in step 340, a short-range wireless communication signal is provided using the occupied frequency resource A.

In particular, when the short-range wireless communication signal is a WIFI signal, the unmanned aerial vehicle 140 may provide a WIFI signal through a TWAG node as illustrated in FIG. 4. TWAG (Trusted WLAN Access Gateway) is defined in release 11 of 3GPP, and is a technology for grafting WLAN to LTE. TWAG performs signaling / bearer termination with the WLAN network and works with P-GW and AAA. P-GW provides inter-RAT handover between LTE and WLAN for each APN (Access Point Name) for WLAN users, and TWAG and WLAN networks provide end-to-end mobility and mobility for users through interworking. -End Trusted Network). Accordingly, IP (Internet Protocol) used in the existing cellular communication can be maintained.

If there is no frequency resource available, the drone 140 moves to other cells in the vicinity. At this time, the short-range wireless communication is stopped while the unmanned aerial vehicle 140 is moving, but the network connection is maintained through the existing cellular communication.

In short, the conventional CoMP technology is provided with frequency resources through a neighboring cooperative cell, and thus has a disadvantage that it cannot be used when there is no neighboring cooperative cell or no available frequency resource. On the other hand, in the case of the present invention, the unmanned aerial vehicle 140 can move and use a frequency resource that can be used to find a location that can increase a user's throughput. And CoMP is a technology applied only to a supported terminal, but in the case of the present invention, it can be applied to a user terminal device 150 that does not support CoMP or uses conventional cellular communication.

On the other hand, if the priority user wants to use the occupied frequency resource A, the drone 140, which is the secondary user within the range that does not interfere with the priority user using the frequency resource A, can use the frequency resource A. . Hereinafter, the operation of the unmanned aerial vehicle 140 when the priority user wants to use the frequency resource A will be described with reference to FIG. 5.

5 is a flowchart illustrating an operation of using the frequency resource A by the unmanned aerial vehicle 140 when the priority user wants to use the occupied frequency resource A according to an embodiment of the present invention. Hereinafter, the process performed for each step will be described in detail.

First, in step 510, a priority user senses traffic transmitted through frequency resource A for a predetermined time. This may be performed through the communication unit 142A.

Next, in step 520, the pattern of the sensed traffic is analyzed. This may be performed by the control unit 142B. Here, the pattern of the traffic is whether the traffic is periodic or aperiodic, whether the size of the traffic is large or small (that is, whether the size of the traffic is larger or smaller than a preset reference size), the throughput of the traffic (throughput) or data rate It may be whether the (Date Rate) is high or low (that is, whether the throughput of the traffic is greater or less than a preset reference throughput or whether the data rate of the traffic is greater than or less than a preset reference data rate).

Finally, in step 530, the use of frequency resource A is controlled based on the analyzed traffic pattern. This may be performed through the control unit 142B.

According to the first embodiment of the present invention, when the size of traffic is greater than the reference size (Big Traffic), and the traffic throughput is greater than the reference throughput (High Traffic), the control unit 142B performs frequency resource A for a predetermined time. Use to control not to transmit and receive data.

That is, the above situation is when a priority user transmits conversational video (cyclic video), which is periodic traffic and real-time streaming data, or transmits peer-to-peer (P2P) data, which is aperiodic traffic, and has high data throughput. Since there are few remaining frequency resources, the unmanned aerial vehicle 140, which is a next-order user, waits for a predetermined time (Backoff time) without using the frequency resource A. After the preset time, the control unit 142B re-sensing and re-analyzes the traffic pattern to control the use of frequency resource A according to the situation.

And, according to the second embodiment of the present invention, when the traffic is periodic, the size of the traffic is greater than the reference size (Big Traffic), and the traffic throughput is less than the reference throughput (Low Throughput), the control unit 142B is overlayed. The relay unit 142 may be controlled to operate in an overlay mode.

Here, the overlay mode is a mode in which the priority user and the secondary user can simultaneously transmit data, and the secondary user needs to know the encoding scheme of the priority user in order to perform cooperative communication with the priority user.

That is, the above situation is when a priority user transmits a non-conversational video, which is a periodic traffic, the traffic is large, but the data throughput is low. Accordingly, under the control of the control unit 142B, the unmanned aerial vehicle 140, which is a secondary user, can transmit data at an empty time when the priority user does not transmit traffic by referring to the cycle of traffic transmitted by the priority user. have.

In addition, according to the third embodiment of the present invention, the traffic is periodic, the traffic size is smaller than the reference size (Small Traffic), and the traffic throughput is smaller than the reference throughput (Low Throughput), the control unit 142B is overlayed. Mode may be controlled to operate, or the relay unit 142 may be controlled to operate in an underlay mode.

Here, the underlay mode is a mode in which the priority user and the secondary user transmit data together, and the secondary user needs to transmit data by adjusting transmission power so as not to exceed an allowable interference temperature.

That is, the above situation is a case in which the priority user uses an Internet phone (VolP) having a small throughput but high throughput or the sensor user having a small traffic volume and low throughput. Accordingly, under the control of the control unit 142B, the unmanned aerial vehicle 140, which is a secondary user, transmits data at an empty time according to the cycle of traffic transmitted by the priority user (overlay mode) or does not cause interference. Data can be transmitted with priority users within (underlay mode).

In addition, according to the third embodiment of the present invention, when the traffic is aperiodic, the size of the traffic is greater than the reference size (Big Traffic), and the throughput of the traffic is less than the reference throughput (Low Throughput), the control unit 142B The relay unit 142 may be controlled to operate in the underlay mode.

That is, the above situation is a case where a priority user performs web browsing in which the traffic is aperiodic and has a large traffic volume but low throughput. Accordingly, under the control of the control unit 142B, the unmanned aerial vehicle 140, which is a secondary user, may transmit data with a priority user within a range that does not cause interference (underlay mode).

And, according to the fourth embodiment of the present invention, when the traffic is aperiodic and the size of the traffic is smaller than the reference size (Big Traffic), regardless of the traffic throughput, the control unit 142B relays to operate in the underlay mode The unit 142 can be controlled.

That is, in the above situation, the priority user performs an interactive game in which the traffic is aperiodic, the traffic size is small, but has high throughput, or the traffic is aperiodic, the traffic size is small, and the throughput is low. A branch is when a priority user performs an email / SNS chat. Accordingly, under the control of the control unit 142B, the unmanned aerial vehicle 140, which is a secondary user, may transmit data with a priority user within a range that does not cause interference (underlay mode).

Table 1 is a table summarizing the above description.

Meanwhile, the control unit 142B may not be able to determine whether the traffic is periodic or aperiodic within a predetermined time, or may not be able to determine the size of the traffic.

In this case, if the traffic throughput is greater than the reference throughput, the control unit 142B may control not to transmit and receive data using the frequency resource A for a preset time, and re-analyze the traffic pattern after the preset time has passed. have. On the other hand, if the traffic throughput is smaller than the reference throughput, the control unit 142B may control to operate in an underlay mode.

In addition, embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and can be recorded in computer readable media. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. Examples of program instructions, such as magneto-optical, and ROM, RAM, flash memory, etc., can be executed by a computer using an interpreter as well as machine code such as those produced by a compiler. Contains high-level language codes. The hardware device described above may be configured to operate as one or more software modules to perform the operations of one embodiment of the present invention, and vice versa.

As described above, in the present invention, it has been described by specific matters such as specific components and limited embodiments and drawings, but this is provided only to help the overall understanding of the present invention, and the present invention is not limited to the above embodiments, Those skilled in the art to which the present invention pertains can make various modifications and variations from these descriptions. Accordingly, the spirit of the present invention should not be limited to the described embodiments, and should not be determined, and all claims that are equivalent or equivalent to the scope of the claims as well as the claims to be described later belong to the scope of the spirit of the invention. .

Claims (10)

In the relay device attached to the drone,
A communication unit sensing a channel near the space where the unmanned aerial vehicle is located and performing data communication with an external device; And
A base station that controls the communication unit, calculates a location with a maximum available frequency resource based on the channel sensing result, and manages the calculated location through the communication unit when the unmanned aerial vehicle is present at the calculated location. And a controller configured to perform channel use negotiation based on cognitive wireless communication.
When occupying frequency resource A through the channel use negotiation, the control unit controls to provide a short-range wireless communication signal using the frequency resource A,
When a priority user wants to use the frequency resource A,
The communication unit senses the traffic transmitted by the priority user through the frequency resource A for a preset time,
The control unit analyzes the pattern of the sensed traffic, re-analyzes the pattern of the traffic after a preset time using the periodicity of the traffic, the size of the traffic, and the size of the traffic, overlay-only mode, under The relay device, characterized in that the control to use the frequency resource A in one of the ray-only mode and a mixed mode of overlay and underlay. delete According to claim 1,
When the size of the traffic is greater than a preset reference size and the throughput of the traffic is greater than a preset reference throughput, the control unit controls not to transmit and receive data using the frequency resource A for a preset time, and the preset time After this, the repeater device characterized in that the re-analysis of the traffic pattern. According to claim 1,
If the traffic is periodic, the size of the traffic is greater than a preset reference size, and the throughput of the traffic is less than a preset reference throughput,
The control unit is characterized in that the control device to operate in an overlay mode. According to claim 1,
When the traffic is periodic, the size of the traffic is smaller than a preset reference size, and the throughput of the traffic is smaller than a preset reference throughput,
The control unit is controlled to operate in the overlay mode, or to control the operation to operate in the underlay mode. According to claim 1,
When the traffic is aperiodic, the size of the traffic is greater than a preset reference size, and the throughput of the traffic is less than a preset reference throughput,
The control unit is a relay device, characterized in that for controlling to operate in the underlay mode. According to claim 1,
When the traffic is aperiodic and the size of the traffic is smaller than a preset reference size,
The control unit is a relay device, characterized in that for controlling to operate in the underlay mode. According to claim 1,
In the case that it is not possible to determine whether the traffic is periodic or aperiodic within the preset time, or the size of the traffic cannot be determined,
The control unit,
When the throughput of the traffic is greater than a preset reference throughput, control not to transmit and receive data using the frequency resource A for a preset time, re-analyze the pattern of the traffic after the preset time passes,
When the throughput of the traffic is less than a predetermined reference throughput, the relay device, characterized in that to control to operate in the underlay mode. For drones,
A driving unit that controls driving of the drone; And
Includes a relay unit for providing a short-range wireless communication signal based on the cognitive wireless communication;
The relay unit, a communication unit for sensing a channel near the space where the drone is located, and performing data communication with an external device; And controlling the communication unit, calculating a location where a frequency resource that can be used is the maximum based on the channel sensing result, and managing the calculated location through the communication unit when the unmanned aerial vehicle is present in the calculated location. Containing a base station and the cognitive radio communication based channel use negotiation; includes, but, when occupying the frequency resource A through the channel use negotiation, the control unit to provide a short-range wireless communication signal using the frequency resource A Control,
When a priority user wants to use the frequency resource A,
The communication unit senses the traffic transmitted by the priority user through the frequency resource A for a preset time,
The control unit analyzes the pattern of the sensed traffic, re-analyzes the pattern of the traffic after a preset time using the periodicity of the traffic, the size of the traffic, and the size of the traffic, overlay-only mode, under Drone, characterized in that the control to use the frequency resource A in one of the mode of overlay and underlay mixed mode. In the method of performing a relay based on cognitive wireless communication using an unmanned aerial vehicle,
(a) sensing a channel near the space where the drone is located;
(b) calculating a location where a frequency resource that can be used is the maximum based on the channel sensing result;
(c) if the unmanned aerial vehicle is present at the calculated location, performing a channel use negotiation based on cognitive wireless communication with a base station managing the calculated location; And
(d) when occupying frequency resource A through the channel use negotiation, providing a short-range wireless communication signal using the frequency resource A;
When a priority user wants to use the frequency resource A,
In step (a), the priority user senses traffic transmitted through the frequency resource A for a predetermined time,
The step (d) analyzes the pattern of the sensed traffic, re-analyzes the pattern of the traffic after a preset time using the periodicity of the traffic, the size of the traffic, and the size of the throughput of the traffic, overlay only Mode, underlay-only mode and one of the overlay and underlay mixed mode, the relay method characterized in that it is determined to use the frequency resource A.

Images