KR20110034317A - Communication device and method for transmitting information in multiple frequency bands - Google Patents

Abstract

Disclosed are a communication apparatus, a terminal apparatus, and a communication method for transmitting control information including information necessary for finding a blocked or changed beam direction and other information necessary for smooth data communication. Here, the control information includes beam tracking information, beam search information, and the like, and is information requiring high reliability, so that the control information can be transmitted by detecting a channel state.

Description

COMMUNICATION APPARATUS FOR TRANSMISSION INFORMATION USING MULTI-FREQUENCY AND METHOD THREOF}

Embodiments of the present invention relate to a technique of performing beamforming on data or control information in a specific frequency band.

Recently, with the development of video technology, the capacity of data to be transmitted is increasing, and the demand of users to receive high resolution video in real time is increasing. In particular, in order to transmit uncompressed high definition digital video (Uncompressed HD video) having high resolution in real time or within a few seconds, a transmission speed of several G to several tens of Gbps is required. To this end, research is being actively conducted to transmit uncompressed high definition digital video at high speed.

In this case, when data is transmitted at 60 GHz, data loss in air occurs due to the high frequency straightness, the distance loss, and the characteristics absorbed by O ₂ (oxygen molecules). Accordingly, there is a need for a technology capable of transmitting information requiring high speed at a high speed, and information requiring high reliability with minimum free space loss.

The communication method for beamforming may include determining a communication mode for a first frequency band and a second frequency band based on channel state information, and allocate a frequency band for data and a frequency band for control information according to the communication mode. And receiving data through a frequency band for data, and transmitting control information through a frequency band for control information.

The first frequency band may be a high frequency band of 60 GHz or more, and the second frequency band may be a low frequency band of less than 60 GHz, such as 2.4 GHz or 5 GHz.

The communication mode may include at least one of a high frequency mode, a low frequency mode, and a mixed mode. At this time, the high frequency mode receives the data in the high frequency band and transmits the control information in the high frequency band, the low frequency mode receives the data in the low frequency band and transmits the control information in the low frequency band, and the mixed mode transmits the data in the high frequency band. This mode may be a mode for transmitting reception and control information in a low frequency band.

In addition, the determining may include changing the determined communication mode based on the data received through the allocated frequency band according to the determined communication mode.

The communication apparatus for beamforming may include a determiner configured to determine a communication mode for a first frequency band and a second frequency band based on channel state information, a frequency band for data and a frequency band for control information according to the communication mode. And a transmitting and receiving unit for receiving data through a frequency band for data and transmitting control information through a frequency band for control information.

The communication apparatus for beamforming includes: transmitting a reference signal, receiving control information transmitted through a frequency band allocated according to a communication mode determined based on the reference signal, and a frequency band allocated according to the determined communication mode Transmitting data through the. Here, the determined communication mode may be a communication mode for the first frequency band and the second frequency band based on the channel state information obtained using the reference signal or data.

By allocating a frequency band for transmitting data and control information in consideration of the channel state between the terminal device and the communication device, it is possible to improve reliability due to high speed data transmission and control information transmission.

In addition, loss of control information can be reduced by transmitting control information in a low frequency band without beamforming.

In addition, the transmission power efficiency may be improved by transmitting and receiving data or control information in a low frequency band in consideration of channel conditions.

Recently, a user's interest in a service for transmitting high resolution data at high speed has increased based on many studies. In order to transmit data at high speed, a high frequency transmission of 60 GHz or more may be used to transmit a large amount of data quickly due to a wide bandwidth.

1 illustrates a communication system for performing beamforming in a high frequency band.

Beamforming is a technique of forming a beam in a direction to be transmitted. That is, referring to FIG. 1, the terminal device 20 forms a beam to the communication device 10 to transmit information. At this time, the communication device may also form a beam to the terminal device to transmit information.

1. 60 GHz Beamforming  Technology

A directional antenna is used for beamforming. When information is transmitted using the directional antenna, power loss can be compensated for, thereby reducing a reduction in propagation distance due to free space loss. In particular, when a plurality of antennas are provided in a communication device or a terminal device, the beam direction can be adaptively changed by forming a beam using an antenna array technology. In this case, as the number of antennas increases, a radio wave reaching distance increases, and when the number of antennas increases, beamforming becomes sharp, thereby increasing power gain in a direction to be transmitted.

For this reason, when the beamforming technique is used in the 60 GHz frequency band, information is transmitted by forming a beam in a direction in which information is to be transmitted, thereby preventing information from being transmitted in another direction.

2. Beam Search ( Beam - Searching ) Technology

When information is transmitted and received between the communication device and the terminal device by using a beamforming technique, an obstacle exists between the communication device and the terminal device, either one of the communication device and the terminal device moves, or any of the communication device and the terminal device. One angle change results in a beam blocking situation in which the beam path is blocked or changed.

When beam blocking occurs, a situation in which information transmitted and received between the communication device and the terminal device is interrupted occurs. That is, when the information is a high-capacity video image, serious image distortion occurs during the reception of the image in real time due to beam blocking. As such, a technique is used to find a changed beam direction to reduce interruption of information during communication between the communication device and the terminal device, or to find a new beam direction for transmitting information when the beam direction is blocked.

Beam-Searching is a technique for finding the optimal beam direction from the initial stage of forming the beam pattern in the direction to be transmitted. When a part of the beam direction is changed due to slight movement of the terminal device or communication device, the beam search is performed. Finding the beam direction through searching has a large time loss. Accordingly, when the beam direction is gradually changed, a beam tracking technique for gradually finding the beam direction with respect to the changed direction may be used, rather than the beam searching for the beam direction from the beginning.

3. Beam Tracking ( Beam - Tracking ) Technology

The beam tracking technology is a technology for monitoring a channel state between a communication device and a terminal device, and gradually detecting a channel direction in which a change occurs and adjusting a beam in a new direction.

More specifically, the beam tracking finds the changed beam direction by searching the peripheral beam direction of the current beam direction when the beam direction is changed. In this way, the beam tracking can be performed in a short time since the changed beam direction is found by searching the peripheral beam direction instead of the whole. Through this, even when the beam direction is blocked or changed in the communication device or the terminal device, information can be transmitted and received without interruption.

In addition, beam tracking when both the communication device and the terminal device have multiple antennas is as follows. In this case, it is assumed that both the communication device and the terminal device perform beamforming through the multi-antenna array. Here, the number of antennas of the communication device and the terminal device may be the same, may be different from each other, and the case where the number of antennas is one may be considered.

It is also assumed that when the beam of the terminal device is changed, the beam of the communication device is also changed. That is, the beam of the terminal device and the beam of the communication device exist as a pair, BeamPair (i)-{Tx-Beam (i), Rx-Beam (i)}. In this case, the same communication device beam may exist for beams of different terminal devices, and the same terminal device beam may exist for different communication device beams. When transmitting information, BeamPair_opt = [Tx-Beam_opt, Rx-Beam_opt] is used as a beam combination to achieve optimal performance.

In addition, when there is an obstacle between the communication device and the terminal device and the current beam combination BeamPair_now is not optimal, the communication device transmits a signal to the terminal device indicating to change the transmission beam of the terminal device. The reception beam corresponding to the transmission beam directed to the device is changed.

In this case, when an obstacle suddenly appears between the communication device and the terminal device, the transmission and reception beams must be changed quickly in the communication device and the terminal device, but control information used to change the direction of the beam is also transmitted due to the change in the direction of the obstacle or the terminal. This impossible situation occurs. To this end, when transmitting control information in a communication device, a modulation coding scheme (MCS) may be lowered or a wider beam may be used.

However, if the MCS is lowered or a wider beam is used, transmission efficiency is reduced due to the characteristics of the 60 GHz frequency band, and thus it takes a long time for the communication device and the terminal device to transmit and receive control information. Accordingly, there is a need for a new beam tracking technique that can reliably transmit control information while minimizing degradation in transmission efficiency.

Hereinafter, with reference to the accompanying drawings, a description will be given of a beam tracking technique capable of transmitting control information or data at high speed and reliably through a plurality of frequency bands according to a channel state between a communication device and a terminal device.

2 is a diagram illustrating a configuration of a communication device according to an embodiment of the present invention.

Referring to FIG. 2, the communication device 200 includes a transceiver 210, a determiner 230, and a controller 250.

The transceiver 210 receives a reference signal for detecting a channel state between the communication device 200 and the terminal device 300 from the terminal device 300 and is allocated by the controller 250 to be described later. The control information is transmitted to the terminal device 300 through the frequency band. Here, the control information is information requiring high reliability, and includes beam tracking information and beam search information used to find a new beam.

The transceiver 210 receives data through the frequency band allocated from the terminal device 300. Here, the data is transmitted from the terminal device 300 to the communication device 200 as information for requesting high speed transmission.

The determiner 230 obtains channel state information using the reference signal or data received through the transceiver 210, and determines a communication mode for transmitting and receiving data and control information based on the obtained channel state information. . The channel state information may include power of a signal including a reference signal or data, signal to noise ratio (SNR), mobility of the terminal device 300 or the communication device 200, and a communication device ( At least one of the distance between the 200 and the terminal device 300.

Hereinafter, for convenience of description, the case where the channel state information is the strength of the reference signal will be described as an example.

In more detail, as shown in FIG. 3, the determiner 230 compares the strength of the reference signal with a plurality of preset reference ranges th ₁ and th ₂ through the transceiver 210, and compares the data. Alternatively, determine a communication mode for transmitting and receiving control information. Here, the communication mode includes a high frequency mode, a low frequency mode, and a mixed mode.

That is, the decision unit 230 is less than the intensity of the reference signal is high frequency reference range (th _1), intensity is high frequency reference range (th ₁₎ for determining a reference signal for the current communication mode to the high-frequency mode (410) or more, If the low frequency reference range th ₂ or more, the current communication mode is determined as the mixed mode 430. If the intensity of the reference signal is less than the high frequency reference range th ₂ , the current communication mode is determined as the low frequency mode 450.

Here, the high frequency mode is a mode for transmitting and receiving data and control information in a high frequency band, the low frequency mode is a mode for transmitting and receiving data and control information in a low frequency band, and in the mixed mode, the data is received in a high frequency band and control information Is a mode for transmitting in the low frequency band.

In addition, the determiner 230 compares the strength of the signal received through the frequency band allocated according to the current communication mode with a plurality of preset reference ranges th ₁ and th ₂ to maintain or change the current communication mode. Determine whether or not.

In more detail, for example, when the current communication mode is the mixed mode 430, the determination unit 230 selects the current communication mode as the mixed mode 430 when the received signal intensity is greater than or equal to the high frequency reference range th ₁ . Change to the high frequency mode (410) in. At this time, the determination unit 230 maintains the current communication mode as a mixed mode if the intensity of the received signal is less than the high frequency reference range (th ₁ ), or more than the low frequency reference range (th ₂ ).

In the same way, the determiner 230 compares the strength of the received signal with a plurality of preset reference ranges th ₁ and th ₂ , and compares the current communication mode to the low frequency mode in the mixed mode 430 as shown in FIG. 4. 450, from high frequency mode 410 to low frequency mode 450, from high frequency mode 410 to mixed mode 430, from low frequency mode 450 to mixed mode 430, and from low frequency mode 450 The high frequency mode 410 may be changed or maintained.

The controller 250 allocates a frequency band for data and a frequency band for control information according to the communication mode determined by the determiner 230. Then, the transceiver 210 transmits control information for searching for a new beam direction through the allocated frequency band to the terminal device 300. In this case, the control information includes frequency band information allocated according to the current communication mode so that the terminal device 300 can transmit data from the terminal device 300 to the communication device 200.

In addition, when the determined communication mode is a high frequency mode, the controller 250 beamforms the control information. Then, the transceiver 210 transmits the beamformed control information to the terminal device 300 through the allocated frequency band.

In the above, it has been described that the communication mode is set to three, and the current communication mode is determined and changed by comparing a plurality of preset reference ranges th ₁ and th ₂ , but the communication mode is set to two and one. The current communication mode may be determined and changed using the reference range th.

In more detail, when the communication mode includes the high frequency mode 510 and the mixed mode 530, as shown in FIG. 5, the determiner 230 determines that the received signal has a strength greater than or equal to the reference range th. If the current communication mode is a high frequency mode 510 and less than the reference range th, the current communication mode is determined as a mixed mode 530.

Then, the controller 250 allocates a frequency band according to the determined communication mode in the same manner as described above, and the transceiver 210 transmits control information through the assigned frequency band. In this case, when the determined current communication mode is a high frequency mode, the controller 250 beamforms the control information and transmits the control information to the terminal device 300 through the transceiver 210.

In addition, the determination unit 230 compares the received signal strength and the reference range, as shown in Figure 5, the current communication mode from the high frequency mode 510 to the mixed mode 530, mixed mode 530 in the high frequency mode Or change to 510.

Similarly, when the communication mode includes the low frequency mode 610 and the mixed mode 630, as shown in FIG. 6, the determination unit 230 may determine that the received signal is less than the reference range th. If the communication mode is the low frequency mode 610 and the reference range th or more, the current communication mode is determined as the mixed mode 630. Then, in the same manner as described above, the controller 250 allocates a frequency band according to the determined communication mode, and the transceiver 210 transmits control information through the assigned frequency band.

In addition, the determination unit 230 compares the received signal strength and the reference range, as shown in Figure 6, the current communication mode from the low frequency mode 610 to the mixed mode 630, mixed mode 630 in the low frequency mode 610 may be changed or maintained.

7 is a flowchart provided to explain an operation of a communication device for transmitting and receiving information through an allocated frequency band according to a communication mode. In FIG. 7, for convenience of description, a case in which a communication mode includes a high frequency mode, a low frequency mode, and a mixed mode will be described. In this case, as described above, the communication mode may be preset to include at least two of a high frequency mode, a low frequency mode, and a mixed mode.

First, the transceiver 210 receives a reference signal from the terminal device 300 (S710).

Next, the determination unit 230 obtains the strength of the reference signal using the received reference signal, and compares the strength of the obtained reference signal with a plurality of preset reference ranges to determine a current communication mode (S720).

That is, the determiner 230 determines the current communication mode as one of a high frequency mode, a low frequency mode, and a mixed mode by comparing the strength of the reference signal with a plurality of preset reference ranges th ₁ and th ₂ .

In this case, the high frequency mode is a mode for receiving data in a high frequency band and transmitting control information in a high frequency band, and the low frequency mode is a mode for receiving data in a low frequency band and transmitting control information in a low frequency band, and a mixed mode. Is a mode in which data is received in a high frequency band and control information is transmitted in a low frequency band. Here, the low frequency band includes at least one of 2.4 GHz and 5 GHz, and the high frequency band includes 60 GHz or more.

The controller 250 allocates a frequency band for data and a frequency band for control information according to the determined current communication mode (S730).

Subsequently, the controller 250 beamforms the control information through the allocated frequency band or transmits the beam without beamforming (S740). Here, examples of the control information may include beam tracking information and beam search information.

The determination unit 230 determines whether to maintain or change the current communication mode based on the data received through the allocated frequency band (S750).

Specifically, the determiner 230 compares the strength of the signal including the data with a plurality of preset reference ranges th ₁ and th ₂ , and when the channel state worsens, as shown in FIG. 4, the current communication mode is mixed. Change from mode 430 to low frequency mode 450, from high frequency mode 410 to low frequency mode 450, from high frequency mode 410 to mixed mode 430. The low frequency mode 450 may be changed to the mixed mode 430, the low frequency mode 450 to the high frequency mode 410, and the mixed mode to the high frequency mode. At this time, if the strength of the received signal corresponds to the current communication mode, the determination unit 230 maintains the current communication mode as it is.

Subsequently, when the current communication mode is changed, the controller 250 allocates a frequency band for data and a frequency band for control information according to the changed communication mode (S760). In this case, in operation S750, when the current communication mode is maintained without change, the controller 250 transmits control information to the terminal device 300 through the frequency band allocated in operation S730.

The controller 250 beamforms the control information through the allocated frequency band according to the changed communication mode, or transmits the control information to the terminal device 300 without beamforming (S770). Here, the control information includes frequency band information allocated according to the changed communication mode to transmit data from the terminal device 300 to the communication device 200.

8 is a diagram illustrating a configuration of a terminal device according to an embodiment of the present invention. In the terminal device, for convenience of description, the case where the communication mode includes a high frequency mode, a low frequency mode, and a mixed mode will be described.

Referring to FIG. 8, the terminal device 300 includes a transceiver 310 and a controller 330.

The transceiver 310 transmits a reference signal used to detect a channel state between the communication device 200 and the terminal device 300 to the communication device 200, and receives control information from the communication device 200. Here, the control information includes frequency band information allocated according to the current communication mode determined by the communication device 200, and examples of the control information may include beam tracking information and beam search information.

In addition, the transceiver 310 transmits data to the communication device 200 through a frequency band allocated according to the current communication mode determined by the communication device 200. Here, the communication mode includes a high frequency mode, a low frequency mode, and a mixed mode. In this case, the transceiver 310 transmits beamformed data when the current communication mode is a high frequency mode or a mixed mode, and transmits data that is beamformed or not beamformed when the current communication mode is a low frequency mode. 200).

More specifically, the high frequency mode is a mode for transmitting data in a high frequency band and receiving control information in a high frequency band, and the low frequency mode is a mode for transmitting data in a low frequency band and receiving control information in a low frequency band. The mixed mode is a mode for transmitting data in a high frequency band and receiving control information in a low frequency band.

The controller 330 obtains frequency band information indicating an allocated frequency band according to the current communication mode determined or changed by the communication apparatus 200 from the control information received through the transceiver 310.

If the current communication mode is a high frequency mode, the controller 330 beamforms the data using the obtained frequency band information. Then, the transceiver 310 transmits the beamformed data to the communication device 200 through the frequency band allocated according to the current communication mode.

In this case, when the current communication mode is a mixed mode, the controller 330 controls the transceiver 310 to beamform data and transmit the data to the communication device 200.

In addition, when the current communication mode is a low frequency mode, the controller 330 controls the transceiver 310 to be transmitted to the communication device 200 without beamforming or beamforming data.

9 is a flowchart provided to explain an operation of a terminal device according to an embodiment of the present invention.

First, the transceiver 310 receives the control information from the communication device 200 (S910). Here, the control information includes frequency band information allocated according to a communication mode determined or changed to transmit data from the terminal device 300 to the communication device 200.

Subsequently, the controller 330 obtains frequency band information from the received control information (S930).

If the current communication mode is the high frequency mode based on the obtained frequency band information (S950: YES), the controller 330 beamforms the data (S970). Then, the transceiver 310 transmits the beamformed data to the communication device 200 through the frequency band allocated according to the current communication mode based on the frequency band information.

That is, when the current communication mode is a high frequency mode or a mixed mode, the controller 330 beamforms the data, and controls the transceiver 310 to transmit the beamformed data in the high frequency band.

At this time, if the current communication mode is not a high frequency mode (S950: NO), if the low frequency mode, the control unit 330 transmits the non-beamformed data to the communication device 200 through the assigned frequency band based on the frequency band information. (S990).

10 illustrates signals transmitted and received according to a communication mode in a wireless communication system.

According to FIG. 10, when the current communication mode is a high frequency mode, signals represented by solid and dotted lines are transmitted in a high frequency band, and in a mixed mode, signals represented by solid lines are transmitted in a high frequency band and signals represented by a dotted line are transmitted in a low frequency band. In the low frequency mode, signals represented by solid and dashed lines are transmitted in the low frequency band. Here, the signals indicated by solid lines and dotted lines are signals transmitted and received for beam searching or beam tracking, and in particular, the signals indicated by dotted lines are control information requiring high reliability.

Up to now, it has been described with respect to determining the communication mode for transmitting and receiving data and control information in consideration of the channel state between the communication device 200 and the terminal device 300, this is only an embodiment, considering the channel state The communication mode for transmitting the control information can be determined, and the communication mode for transmitting the data can be determined in consideration of the nature of the data.

In more detail, in the same manner as described above, the communication apparatus 200 determines whether to transmit the control information in the high frequency band or the low frequency band using the channel state information and the predetermined reference ranges. Here, the high frequency band includes a frequency band of 60 GHz or more, and the low frequency band includes 2.4 GHz and 5 GHz frequency bands.

After determining the frequency band for transmitting the control information, the communication device 200 may determine whether to transmit the data in the high frequency band or the low frequency band according to the nature of the data to be transmitted from the terminal device 300. . Here, the nature of the data includes information indicating whether it is data requiring high-speed transmission or data requiring high reliability.

In other words, if the data is news containing text, the property of the data includes information requiring high reliability, and the property of the data is high-speed transmission when the data contains images requiring fast reproduction such as sports. Contains the required data.

More specifically, the communication device 200 allocates a frequency band for data to a high frequency band if the property of the data requires high-speed transmission, and if the property of the data requires data with high reliability, Allocate a frequency band to a low frequency band.

The communication device 200 transmits the frequency band information indicating the allocated frequency band to the terminal device 300 by including the information in the control information. In this case, the property of the data may be obtained using meta information included in the data.

In the above description, the communication device 200 allocates a frequency band for control information in consideration of the channel state, and allocates a frequency band for data in consideration of the nature of the data, but the channel state in the communication device 200. In this regard, a frequency band for control information may be allocated, and the terminal device 300 may allocate a frequency band for data in consideration of the nature of the data.

In addition, the terminal device 300 may allocate a frequency band for control information in consideration of the channel state, and allocate a frequency band for data in consideration of the nature of the data.

In addition, although 2.4GHz has been described as the low frequency band in the communication mode, 5GHz may be used instead of 2.4GHz.

In addition, the case in which the communication mode is preset to three has been described, but this is only an example, and the communication mode may be preset to four or more. Accordingly, the reference ranges may also be preset to three or more.

In addition, in the above description, the term “ideal” or “less than” was used to compare the channel state information with the reference range. However, this is only an example for convenience of description and the term “over” or “less than”. You can compare the channel status information with the reference range using.

Here, as shown in FIG. 5, in order to prevent frequent mode switching due to fixing the reference range th of the communication channel state, a margin may be set above and below the reference range. That is, for example, when the current mode is the high frequency mode, the signal is changed to the mixed mode only when the strength of the signal is lower than the lower allowable range of the reference signal strength, and when the current mode is the mixed mode, the signal strength is the reference. It can only be changed to the high frequency mode if it is higher than the upper allowable range of the signal. Similarly, in FIG. 3 and FIG. 6, a reference range may be set by allowing margins in the same manner as in FIG. 5.

In addition, in the above, the operation of the communication device 200 and the terminal device 300 has been divided and described, but this is only an example for convenience of description, and determines the communication mode in the terminal device 300, and determines the determined communication mode. Accordingly, data and control information can be transmitted and received through the allocated frequency band. That is, the communication system may include communication between the terminal devices 300 in addition to the communication between the communication device 200 and the terminal device 300.

In addition, the communication device 200 may include a display device such as a TV, a PC, or the like. As an example of the terminal device, a multimedia device such as a set-top box, a DVD player, a game console, a video console for processing video signals such as a camcorder, a camera, a portable multimedia player (PMP), an MP3 player, etc. Devices, and portable devices such as DMB phones, mobile phones, and the like.

In addition, a communication device, a terminal device, and a communication system and method including the same, which transmit and receive information in multiple frequency bands, can be applied to a home network because they are easy to transmit at high speed in the 60 GHz band. In this case, the home network central server may be a communication device, and at least one device connected to the central server may be a terminal device.

In the above description, the high frequency band and the low frequency band have been described. However, since the frequency band may be divided into three or more according to the design of the communication system, the high frequency band may be represented by the first frequency band and the low frequency band by the second frequency band. Can be.

In addition, the communication apparatus, the terminal apparatus, and the interference alignment method according to the embodiments of the present invention include a computer readable medium including program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The media may be program instructions that are specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains various modifications and Modifications are possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 illustrates a communication system for performing beamforming in a high frequency band.

2 is a diagram illustrating a configuration of a communication device according to an embodiment of the present invention.

3 to 6 are diagrams provided to explain a communication apparatus for transmitting information through a frequency band allocated according to a communication mode.

7 is a flowchart provided to explain an operation of a communication device for transmitting and receiving information through an allocated frequency band according to a communication mode.

8 is a diagram illustrating a configuration of a terminal device according to an embodiment of the present invention.

9 is a flowchart provided to explain an operation of a terminal device according to an embodiment of the present invention.

10 illustrates signals transmitted and received according to a communication mode in a wireless communication system.

<Explanation of symbols for the main parts of the drawings>

200: communication device

300: terminal device

210, 310: transceiver

230: decision

250, 330: control unit

Claims (10)

Determining a communication mode for the first frequency band and the second frequency band based on the channel state information; Allocating a frequency band for the data and a frequency band for the control information according to the communication mode; And Receiving the data through a frequency band for the data and transmitting the control information through a frequency band for the control information Communication method for beamforming comprising a. The method of claim 1, The first frequency band is a high frequency band of 60 GHz or more, and the second frequency band is a low frequency band of 2.4 GHz or 5 GHz. The method of claim 1, The communication mode includes at least one of a high frequency mode, a low frequency mode, and a mixed mode, The high frequency mode receives the data in the high frequency band and transmits the control information in the high frequency band, the low frequency mode receives the data in the low frequency band and transmits the control information in the low frequency band, and the mixed mode And a mode for receiving the data in a high frequency band and transmitting the control information in the low frequency band. The method of claim 1, The channel state information may include at least one of a strength of a signal received from the terminal device, an SNR of the received signal, mobility of the terminal device, and a distance between the terminal device and the communication device. . The method of claim 1, The determining step, Changing the determined communication mode based on the data received through the allocated frequency band according to the determined communication mode; Communication method for beamforming comprising a. The method of claim 1, The determining step, And determining the communication mode by using the channel state information and at least one predetermined threshold region. A determination unit to determine a communication mode for the first frequency band and the second frequency band based on the channel state information; A controller for allocating a frequency band for the data and a frequency band for the control information according to the communication mode; And Transmitting and receiving unit for receiving the data through the frequency band for the data, and transmitting the control information through the frequency band for the control information Communication device for beamforming comprising a. Transmitting a reference signal; Receiving control information transmitted through an allocated frequency band according to a communication mode determined based on the reference signal; And Transmitting data through an allocated frequency band according to the determined communication mode; Including, The determined communication mode is a communication mode for beamforming based on the channel state information acquired using the reference signal or the data. The method of claim 8, The first frequency band is a high frequency band of 60 GHz or more, the second frequency band is a low frequency band of 2.4 GHz or 5 GHz, The reference signal is a communication method for beamforming, which is a signal for detecting a channel state between a communication device and a terminal device. The method of claim 8, The communication mode includes at least one of a high frequency mode, a low frequency mode, and a mixed mode, The high frequency mode transmits the data in a high frequency band, the control information is received in a high frequency band, and the low frequency mode transmits the data in a low frequency band, receives the control information in a low frequency band, and the mixed mode And transmitting the data in a high frequency band and receiving the control information in the low frequency band.

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