KR20080113677A - Wireless communication apparatus and wireless communication method using the apparatus - Google Patents

Abstract

A transmission device for determining data transmission time of the transmission device and a relay and data transmission power and a radio transmission method using the transmission device are provided to increase communication quality by operating a terminal receiving data. A controller(330) selects one of one or more data transmitting path based on status information of a received radio channel. A transmission unit(310) transmits data to the relay positioned on data transmission path in a first time interval not overlapping with a second time interval which transmits data to a receiving apparatus.

Description

Transmission apparatus and wireless transmission method using the said transmission apparatus {WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD USING THE APPARATUS}

1 is a conceptual diagram illustrating a communication system using a relay device.

FIG. 2 is a diagram illustrating a time frame in which a transmission device and a relay device separately transmit time sections so that signal transmission sections do not overlap each other according to the present invention.

3 is a block diagram showing the configuration of a transmission apparatus according to the present invention.

값의 영역을 구분하여 도시한 도면이다.4 is based on the transmission power of the transmission apparatus and the transmission power of the relay apparatus.

The figure shows division of a value area.

5 is a diagram illustrating a beamforming vector in vector space according to the present invention.

6 is a block diagram showing the configuration of the relay apparatus according to the present invention.

7 is a block diagram showing the configuration of a receiving apparatus according to the present invention.

8 is a flowchart illustrating the operation of the transmission method according to the present invention.

9 is a flowchart illustrating the operation of the relay method according to the present invention.

10 is a flowchart illustrating the operation of the receiving method according to the present invention.

The present invention relates to a communication apparatus and method using a relay apparatus, and more particularly, to an apparatus and method for determining data transmission time and data transmission output of a transmission apparatus and a relay apparatus in a communication method using a relay apparatus. will be. The present invention also relates to an apparatus and method for determining a beamforming vector for performing the beamforming when the transmitting apparatus performs beamforming using a plurality of antennas.

With the development of wireless communication networks, various services such as video call data transmission as well as simple voice communication can be used wirelessly.

In digital communication, communication quality is determined as the ratio of the strength of the signal on which data is transmitted and the strength of the interference signal and noise. However, the strength of the signal on which the data is transmitted varies over time due to the characteristics of the radio channel. Therefore, in the conventional mobile communication environment, communication quality cannot be guaranteed to a wireless terminal using a specific service due to a fading phenomenon in which a wireless channel changes over time.

In order to overcome this problem, a technique of setting a constant value of 'Signal to Interference and Noise Ratio (SNIR)' and controlling the strength of a signal on which data is transmitted based on the value is also used. However, if the state of the wireless channel changes very quickly, it is not possible to maintain communication quality using the technique.

Various diversity techniques have been used to overcome this fading phenomenon. In particular, the spatial diversity technique, which transmits and receives data using a plurality of antennas located far from each other, has been widely used as an effective and simple technique for overcoming fading.

However, the space diversity scheme may be used when there is enough space to mount an antenna such as a base station or an access point, but it may not be used in a terminal having a narrow space to mount the antenna.

In particular, the space diversity scheme cannot be used in an ad hoc network that does not require a base network device such as a base station or an access point to configure and maintain a network.

SUMMARY OF THE INVENTION The present invention has been made to improve the above-described prior art, and an object of the present invention is to provide an apparatus and method for improving a communication quality by operating a terminal receiving data from a transmitting apparatus as a relay apparatus for another terminal. do.

It is still another object of the present invention to select a data transmission path from a path for transmitting data directly from a transmitting device to a receiving device and at least one or more paths via at least one or more relay devices, and to transmit data through the selected data transmission path. By transmitting, the communication quality is improved and the data rate is increased.

It is still another object of the present invention to select a data transmission path from among a path for transmitting data from a transmitting device directly to a receiving device and at least one or more paths for transmitting data to the receiving device via at least one or more relay devices. By transmitting data through a relay device located on the data transmission path, the data transmission path and the data transmission path do not go through the relay device located on the data transmission path, but rather when the data is transmitted directly from the transmission device to the reception device. The sum of the transmission powers of the relay devices located on the phase is made small.

It is still another object of the present invention to provide a beamforming to a terminal that receives data from the transmitting device and operates as a relay device for another terminal when the transmitting device performs beamforming using a plurality of antennas and a beamforming vector. To determine the beamforming vector to perform the operation.

In order to achieve the above object and solve the problems of the prior art, a transmitting device connected to a receiving device using at least one or more relay devices, the state information of the radio channel from the at least one or more relay devices and the receiving device A data transmission path of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device based on the received state information of the wireless channel; And a transmitting unit for transmitting data to the receiving device through the selected data transmission path, wherein the transmitting unit is configured to transmit data to the receiving device by a relay device located on the data transmission path. First hour that does not overlap the interval A transmitting device is provided which transmits data to a relay device located on the data transmission path in an interval.

According to yet another aspect of the present invention, a wireless relay device for connecting a transmitter and a receiver, comprising: a control unit for measuring state information of a radio channel with the transmitter, and the state information of the measured radio channel And a transmitting unit for transmitting the first data from the transmitting apparatus based on the transmitted state of the wireless channel and the state information of the wireless channel with the receiving apparatus. A relay device is provided that transmits the received first data to the receiving device in a first time period that does not overlap a second time period for receiving second data from the transmitting device.

According to another aspect of the present invention, in a wireless transmission method connected to a receiving device using at least one or more relay devices, receiving state information of a radio channel from the at least one or more relay devices and the receiving device, Selecting any one of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device based on the received state information of the wireless channel; Transmitting the data to the receiving device through the selected data transmission path; and transmitting the data to the receiving device on a first time period that does not overlap with a second time period during which a relay device located on the data transmission path transmits data to the receiving device. Relay device located on the data transmission path The radio transmission method comprising the step of transmitting data is provided.

According to yet another aspect of the present invention, in a wireless signal relay method for connecting a transmitting device and a receiving device, the method comprising: measuring a state of a wireless channel with the transmitting device, and transmitting state information of the measured wireless channel to the transmitting device Transmitting first data from the transmitting device based on the transmitted state of the wireless channel and the state information of the wireless channel with the receiving device, and receiving the second data from the transmitting device. A wireless signal relay method is provided, comprising transmitting the received first data to the receiving device at a time that does not overlap with time.

Hereinafter, with reference to the accompanying drawings and the contents described in the accompanying drawings will be described in detail preferred embodiments of the present invention, but the present invention is not limited or restricted by the embodiments. Like reference numerals in the drawings denote like elements.

1 is a conceptual diagram illustrating a network configuration of a communication system using a relay device according to an embodiment of the present invention. Hereinafter, a process of transmitting data will be described with reference to FIG. 1. As shown in FIG. 1, the communication system according to the present invention includes a transmitting device 110, at least one relay device 121, 122, 123, and a receiving device 130, and includes a transmitting device, a relay device, And receiving devices are connected to each other through a wireless network.

In general, a relay device is used in a cell based mobile communication environment to increase coverage of a cell or to eliminate shadow areas within a cell.

However, the relay apparatuses 121, 122, and 123 according to the present invention overcome the influence of the change of the radio channel and improve the communication quality even when the transmitting apparatus 110 and the receiving apparatus 130 can physically communicate with each other. It is used to make.

In the present invention, the relay apparatuses 121, 122, and 123 may be fixed structures installed by a communication service provider performing a communication business to improve performance of a communication system. Alternatively, it may be a general user terminal that receives data from the transmitting device 110 to assist communication of another user terminal and delivers the received data to another user terminal operating as the receiving device.

Similarly, the transmitting device and the receiving device in the present invention are devices for transmitting or receiving data, which can be interpreted as a concept encompassing a user terminal or a base station device in a mobile communication network.

The state of the wireless channel changes over time. The transmitting device 110 includes the state information 144 of the wireless channel generated by measuring the state of the wireless channel from the transmitting device 110 to the receiving device 130, and at least one relay device in the transmitting device 110. The reception device 130 from the state information 141, 142, 143 of the wireless channel generated by measuring the state of the wireless channel up to (121, 122, 123) and the at least one relay device 121, 122, 123. The most excellent path is selected by comparing the state information 151, 152, and 153 of the wireless channel generated by measuring the state of the wireless channel. Data is transmitted to any one of the relay devices 121, 122, and 123 located in the path, and any one of the relay devices 121, 122, and 123 that receives the data is sent back to the receiving device 130. If the data is transmitted, the transmitting device 110 and the receiving device 130 can always communicate using the excellent wireless channel.

An example of a system using a relay device according to the present invention is a system of the DF (Decode-Forward) method.

Among the relay device-based wireless communication systems, a system using an AF (Amplify-Forward) type relay device simply amplifies data received by the relay devices 121, 122, and 123 and transmits the received data to the receiving device 130. On the other hand, the system using the DF relay device demodulates the received signal and modulates it again and transmits it to the receiving device 130. A system using a DF relay apparatus has an advantage of modulating a received signal with a codeword different from that of the received signal.

As an example according to the present invention, a pilot signal may be used to measure a state of a wireless channel. Hereinafter, an embodiment of measuring a state of a wireless channel will be described.

The transmitting device 110 transmits a first pilot signal to at least one relay device 121, 122, 123.

(141),

(142),

(143)를 생성한다.At least one relay device (121, 122, 123) receiving the first pilot signal is a radio channel from the transmitting device to the at least one relay device (121, 122, 123) using the first pilot signal. Wireless channel status information by measuring the wireless channel status for

(141),

(142),

Generate 143.

(144)를 생성한다.The first pilot signal is transmitted to the receiving device 130 as well as the at least one or more relay devices 121. The receiving device 130 receiving the first pilot signal measures the radio channel state of the radio channel from the transmitting device 110 to the receiving device 130 to determine radio channel state information.

Generate 144.

(151),

(152),

(153)을 생성한다In addition, each of the at least one relay device 121, 122, 123 transmits a second pilot signal to the reception device 130. The receiving device 130 measures the wireless channel state for each of the wireless channels from the at least one relay device 121, 122, 123 to the receiving device 130 by using the second pilot signal, thereby measuring the wireless channel state. Information

(151),

(152),

Produces 153

The at least one relay device 121, 122, 123 and the reception device 130 transmit the wireless channel state information 141, 142, 143, 144, 151, 152, 153 to the transmission device 110.

According to an embodiment of the present invention, the transmitting device 110 is based on the received state information 141, 142, 143, 144, 151, 152, 153 of the wireless channel, at least one from the transmitting device 110 Any one of at least one or more paths for transmitting data to the receiving device 130 via any one of the relay devices 121, 122, and 123 may be selected as the data transmission path.

According to another embodiment of the present invention, the transmitting device 110 transmits data from the transmitting device 110 to the receiving device via any one or more of the at least one relay device 121, 122, 123. Any one of a path and a path for directly transmitting data from the transmitter 110 to the receiver 130 may be selected as the data transmission path.

According to an embodiment of the present invention, the transmission device 110 may select a path that maximizes the amount of information that can be transmitted in the path as a data transmission path. Herein, the amount of information that can be transmitted means the total amount of data that can be transmitted to and from the maximum between the transmitting apparatus and the receiving apparatus through a specific path, and may also mean a data transmission rate.

와 상기 데이터 전송 경로상에 위치한 중계 장치가 수신 장치로 데이터를 송신하는 전력

을 결정할 수 있다.According to an embodiment of the present invention, at least one of the transmitting apparatus 110 transmits data from the transmitting apparatus 110 to the receiving apparatus 130 via any one of at least one or more relay apparatuses 121, 122, 123. When any one of the above paths is selected as the data transmission path, the transmitting device 110 transmits power to the transmitting device 110 to transmit data to the relay device located on the data transmission path.

And a power for transmitting data to a receiving device by a relay device located on the data transmission path.

Can be determined.

2 illustrates an example in which a transmitting device and a relay device transmit data by dividing a transmission time interval according to the present invention.

As shown in Fig. 2, the transmitting apparatus transmits data to the relay apparatus, and the relay apparatus transmits the transmitted data back to the receiving apparatus in the entire time interval (or time frame), and the transmitting apparatus and the relay apparatus are mutually The data is transmitted by dividing the entire time interval.

2 is a diagram illustrating a time frame in which time intervals are transmitted so that signal transmission intervals do not overlap each other. Hereinafter, referring to FIG. 2, a process of dividing a time interval in which a transmitter transmits data and a time interval in which the relay apparatus transmits data will be described.

According to the present invention, the transmission device 110 using the relay devices 121, 122, and 123 transmits data in units of a predetermined time frame 200. 2 illustrates an example of transmitting data by dividing a specific time frame into a first time interval 210 and a second time interval 220. According to another embodiment of the present invention, the first and second time intervals may be implemented as at least one or more time slots within a specific time frame.

When the transmitting device 110 selects a path for transmitting data directly to the receiving device 130 as a data transmission path, the transmitting device 110 uses the entire time of the specific time frame 200 to the receiving device 130. Send the data.

라고 하고, 상기 특정 시간 프레임 동안 데이터 전송률

로 데이터를 전송한다고 가정하면 송신 장치(110)가 수신 장치(130)로 직접 송신하는 데이터의 총량은

가 된다.The total amount of data transmitted through a specific channel or data transmission / reception apparatus may be expressed as a product of a data rate and a transmission time. The length of a specific time frame

And the data rate during the specific time frame

Suppose that the data is transmitted to the receiving device 110, the total amount of data directly transmitted to the receiving device 130 is

Becomes

Any of at least one path through which the transmitting device 110 according to the present invention transmits data from the transmitting device 110 to the receiving device 130 via any one of the at least one relay device 121, 122, 123. When one is selected as the data transmission path, the transmission device 110 may transmit data to the relay device located on the data transmission path in the first time interval 210 in a specific time frame. Assume that a path via the first relay device 121 among at least one or more relay devices 121, 122, 123 is selected as the data transmission path.

The wireless relay device 121 connecting the transmitting device and the receiving device according to an embodiment of the present invention receives data from the transmitting device 110 in the first time interval 210 and in the second time interval 220. The received data may be transmitted to the receiving device 130.

, 제2 시간 구간(220)의 길이를

라 하고, 전체 시간 프레임(200)의 길이를

라고 하면,

의 관계가 성립한다.The length of the first time interval 210

, The length of the second time interval 220

The length of the entire time frame 200

Speaking of

The relationship is established.

이라고 하면,

의 시간 동안 데이터 전송 경로상에 위치한 중계 장치로 송신되는 데이터의 총량은

이고, 데이터 전송 경로상에 위치한 중계 장치(121)가 수신 장치(130)로 송신하는 데이터의 전송률을

라고 하면,

의 시간 동안 데이터 전송 경로상에 위치한 중계 장치(121)가 수신 장치(130)로 송 신하는 데이터의 총량은

가 된다. 적어도 하나 이상의 중계 장치(121, 122, 123) 중에서 어느 하나를 경유하여 수신 장치(130)로 데이터를 송신하는 경우에도, 수신 장치(130)는 상기 프레임(200)의 시간 구간의 길이

동안에 동일한 양의 데이터를 수신해야 하므로 하기 수학식 1과 같은 관계가 성립한다.The transmission rate of data transmitted from the transmission device 110 to the relay device 121 located on the data transmission path is determined.

Speaking of

The total amount of data sent to the relay device on the data transmission path for

The transmission rate of data transmitted from the relay device 121 located on the data transmission path to the reception device 130 is calculated.

Speaking of

The total amount of data transmitted by the relay device 121 located on the data transmission path to the receiving device 130 for

Becomes Even when transmitting data to the receiving device 130 via any one or more of the at least one relay device 121, 122, 123, the receiving device 130 may have a length of a time interval of the frame 200.

Since the same amount of data must be received during the above relationship, the following equation 1 holds.

[Equation 1]

를 소정의 값 이상으로 유지해야 한다.On the other hand, the signal transmitted by the transmitting device 110 is attenuated while passing through the wireless communication channel. In order for the transmitter 130 to satisfy a desired data rate, the signal to interference and noise ratio (SINR) needs to be maintained above a predetermined value. Therefore, in order for the transmitting device 110 to satisfy the desired data rate, the transmitting power for transmitting the data by the transmitting device 110.

Should be kept above a predetermined value.

In a wireless communication channel whose channel state changes with time, the strength of a signal transmitted by the transmitting device 110 changes with time. Therefore, in a communication channel of a specific path, there is a case that the data transmission rate required by the receiving device 130 may not be satisfied.

Communication outage means that when the transmission device 110 transmits data through the selected data transmission path, the channel state on the data transmission path is deteriorated, thereby satisfying the data rate required by the reception device 130. It is defined as the case where it is not allowed.

In the present invention, in order to minimize the probability of occurrence of a communication break, from the transmitting apparatus 110 to the relay apparatuses 121, 122, 123, from the relay apparatus 121, 122, 123 to the receiving apparatus 130, and to the transmitting apparatus. The data transmission line to transmit data is selected in consideration of the radio channel state from the 110 to the reception device 130.

If data is transmitted via any one or more of the at least one relay device 121, 122, 123, the sum of the transmission power of the transmission device 110 and the transmission power of the relay device 121, 122, 123 is determined. If the transmitting device 110 is larger than the transmission power of the transmitting device 110 when the data is directly transmitted to the receiving device 130, there is no benefit of using the relay devices 121, 122, and 123. Therefore, the sum of the transmission power of the transmission device 110 and the transmission power of the relay device 121 located on the data transmission path for ensuring the data transmission rate required by the reception device 130 are directly received by the transmission device 110. When data is transmitted to the device 130, that is, the transmission power of the transmitting device 110 on the path directly connected from the transmitting device to the receiving device should be smaller.

에 대하여 송신 장치(110)가 데이터를 송신하는 제1 시간 구간의 길이

의 비(또는 비율)를

라고 하고, 송신 장치(110)가 i번째 중계 장치(121, 122, 123)에게 데이터를 송신할 때의 송신전력을

라고 하자. 또, 상기 i번째 중계 장치(121, 122, 123)가 수신 장치(130)로 데이터를 송신할 때의 송신 전력을

이라고 하고, 중계 장치(121, 122, 123)를 사용하지 않고, 상기 송신 장치에서 직접 상기 수신 장치로 데이터를 송신하는 경우에, 소정의 데이터 전송률 이상으로 데이터를 송신하기 위하여 필요한 송신 전력을

라고 하면 다음 수학식 2의 관계가 성립한다. 수학식 2는 본 발명에 따라 "송신 전력의 제한 조건" 이라고 부르도록 한다.If the length of a particular time frame

The length of the first time interval at which the transmitting device 110 transmits data with respect to

The ratio (or ratio) of

The transmission power when the transmission device 110 transmits data to the i-th relay devices 121, 122, and 123.

Let's say In addition, the transmission power when the i-th relay device 121, 122, 123 transmits data to the reception device 130 is measured.

When transmitting data directly from the transmitting device to the receiving device without using the relay devices 121, 122, and 123, the transmission power required for transmitting the data at a predetermined data transfer rate or more is determined.

Then, the relationship of the following equation (2) is established. Equation 2 is referred to as a "limiting condition of the transmission power" according to the present invention.

[Equation 2]

이상으로 데이터를 송신하기 위한 송신 전력

는 상기 송신 전력의 제한 조건에 의하여 송신 장치(110)의 송신 전력

와 i번째 경로 상에 위치한 중계 장치(121, 122, 123)의 송신 전력

의 범위를 제한 하는 '전력 제한치'로서 작용한다.When data is transmitted directly from the transmitting device to the receiving device without passing through the relay device, a predetermined data rate

Transmission power for transmitting data above

Is the transmission power of the transmission device 110 according to the limitation condition of the transmission power

Transmission power of the relay devices 121, 122, 123 located on the & i th path

It acts as a 'power limit' that limits the range of.

According to the present invention, the transmission device 110 and the relay device 121 transmit data by separating time from each other, thereby solving various problems.

For example, if a relay apparatus of the AF method is used, the data transmitted by the transmitting apparatus 110 and the relay apparatus 121 is the same signal or due to the time required for relaying in the relay apparatus 121. The reception device 130 may not receive the same time. Therefore, the two signals act as interference signals with each other, which is a performance detriment factor for the entire communication system.

As another example, when using the DF relay device 121, if the relay device 121 demodulates the data received from the transmission device 110 again, the first transmission device 110 transmits; When the data and the second data transmitted by the relay device 121 are transmitted to be distinguished from each other, the reception device 130 may distinguish and receive the first and second data. However, even in this case, since the receiving device 130 must have a complicated receiver structure in order to distinguish the first and second data, this causes the terminal price and power consumption.

3 is a block diagram showing the configuration of a transmitting apparatus according to the present invention.

As shown in FIG. 3, the transmitter 300 includes a transmitter 310, a receiver 320, and a controller 330. Hereinafter, an operation of the transmitter according to the present invention will be described in detail with reference to FIG. 3.

The transmitter 310 transmits a pilot signal to at least one or more relay devices 341 and 342 and a receiver 350 located in the vicinity of the transmitter 300.

The at least one relay device 341, 342 and the receiving device 350 that have received the at least pilot signal measure the state of the radio channel from the transmitting device 300 using the pilot signal. The at least one relay device 341, 342 and the reception device 350 receiving the pilot signal transmit the state information of the wireless channel, which is generated by measuring the state of the wireless channel, to the transmitting device 300 again.

The receiver 320 receives the state information of the radio channel measured using the pilot signal from the at least one or more relay devices 341 and 342 and the receiver device 350.

The control unit 330 transmits data from the transmitting device 300 to the receiving device 350 via any one of the at least one relay device 341, 342 based on the received state information of the wireless channel. Select one of the one or more paths as the data transmission path.

According to an embodiment of the present invention, the control unit 330 is a path for directly transmitting data from the transmitting device 300 to the receiving device 350 based on the received state information of the wireless channel, and the transmitting device 300. From among one or more of the at least one relay device (341, 342) may select any one of the at least one or more paths for transmitting data to the receiving device as a data transmission path.

Suppose that the path via the first relay device 341 is selected as the data transmission path.

The transmitter 310 is configured on the data transmission path in a first time interval 210 which does not overlap the second time interval 220 in which the relay device 341 located on the data transmission path transmits data to the receiving device. Transmit data to the relay device located at.

The transmitting unit 310 of the transmitting apparatus 300 connected to the receiving apparatus using the relay apparatus according to an embodiment of the present invention transmits pilot signals to at least one relay apparatus 341, 342 and the receiving apparatus 350, respectively. The receiver 320 receives the state information of the radio channel from the transmitter 300 measured by using the transmitted pilot signal from the at least one relay device 341 and 342 and the receiver 350. . The control unit 330 transmits data from the transmitting device 300 to the receiving device 350 via any one of the at least one relay device 341, 342 based on the received state information of the wireless channel. Select the data transfer path. The transmitter 310 is a relay device located on the data transmission path in a first time interval 210 that does not overlap the second time interval 220 in which the relay device located on the selected data transmission path transmits data to the receiving device. Send the data.

According to an embodiment of the present invention, the control unit 330 is a path for transmitting data from the transmitting device 300 to the direct receiving device or the at least one relay device from the transmitting device 300 in order to minimize the probability of occurrence of communication loss. An amount of transmittable information for each of at least one or more paths for transmitting data to the receiving device via any one of 341 and 342, and selecting a path that maximizes the calculated amount of transmittable information as a data transmission path. Can be.

In the transmitting device connected to the receiving device using at least one relay device according to another embodiment of the present invention, the receiving unit 320 is a radio channel from the at least one relay device (341, 342) and the receiving device 350 Receiving the state information, and the control unit 330 transmits any one or more of the at least one path for transmitting data to the receiving device 350 via any one of the at least one or more relay devices (341, 342) To select. The transmitter 310 transmits data to the receiving apparatus 350 through the selected data transmission path. The controller 330 may determine a transmission power for transmitting data to the relay device 341, 342 located on the selected data transmission path so that the amount of information that can be transmitted in the selected data transmission path is maximum. In addition, the relay devices 341 and 342 located on the data transmission path may determine transmission power for transmitting data to the transmission device 350 such that the amount of information that can be transmitted in the selected data transmission path is maximum. In addition, the controller 330 may include a first time interval in which the transmitter 310 transmits first data to the relay devices 341 and 342 located in the data transmission path such that the amount of information that can be transmitted in the selected data transmission path is maximum. And a length of a second time interval in which the relay device located in the data transmission path transmits the second data to the receiving device.

는 다음과 같이 수학식 3에 의해 정해진다.Here, the amount of information that can be transmitted in a path for transmitting data directly from the transmitting device 300 to the receiving device 350.

Is determined by Equation 3 as follows.

[Equation 3]

는 상기 송신 장치(300)에서 상기 수신 장치(350)까지 직접 전송한 경우에 무선 채널의 이득으로서 수신 장치가 송신한 무선 채널의 상태 정보

의 절대값을 제곱하여 구할 수 있다.

는 송신 장치(300)가 수신 장치(350)로 데이터를 송신할 때의 송신 전력이다.here

Is the gain of the wireless channel in the case of direct transmission from the transmitting device 300 to the receiving device 350, the state information of the wireless channel transmitted by the receiving device.

It can be found by square the absolute value of.

Is the transmission power when the transmission device 300 transmits data to the reception device 350.

는 다음과 같이 수학식 4에 의해 정해진다.In addition, the amount of information that can be transmitted for each path for transmitting data from the transmitting device 300 to the receiving device 350 via the i-th relay devices 341 and 342.

Is determined by Equation 4 as follows.

[Equation 4]

는 시간 프레임의 길이

에 대한 상기 송신 장치가 i번째 중계 장치(341, 342)로 데이터를 송신하는 시간

의 길이의 비로서,

이다.

는 상기 송신 장치(300)에서 상기 수신 장치(350)까지 직접 전송한 경우에 무선 채널의 이득으로서 수신 장치가 송신한 무선 채널의 상태 정보

의 절대값을 제곱하여 구할 수 있다.

는 상기 i번째 중계 장치(341, 342)에서 수신 장치(350) 까지의 무선 채널의 이득으로서 수신 장치가 파일럿 신호를 이용하여 측정한 무선 채널의 상태 정보

의 절대값을 제곱하여 구할 수 있다. 또

는 송신 장치(300)가 i번째 중계 장치(341, 342)에게 데이터를 송신할 때의 송신 전력이고,

는 i번째 중계 장치가 수신 장치(350)에게 데이터를 송신할 때의 송신 전력이다.here

Is the length of the time frame

The time at which the transmitting device transmits data to the i-th relay device 341, 342.

As the ratio of the length of

to be.

Is the gain of the wireless channel in the case of direct transmission from the transmitting device 300 to the receiving device 350, the state information of the wireless channel transmitted by the receiving device.

It can be found by square the absolute value of.

Is the gain of the wireless channel from the i-th relay devices 341 and 342 to the receiving device 350, and the state information of the wireless channel measured by the receiving device using the pilot signal.

It can be found by square the absolute value of. In addition

Is the transmission power when the transmission device 300 transmits data to the i-th relay devices 341 and 342,

Is the transmission power when the i-th relay device transmits data to the reception device 350.

가 최대가 되는 경로를 데이터 전송 경로로 선택 한다.According to an embodiment of the present invention, the control unit 330 is a path for transmitting data directly from the transmitting device 300 to the receiving device 350 or the i-th relay device 341 of the at least one or more relay devices 341 and 342. Amount of information that can be transmitted from at least one or more paths for transmitting data to the receiving device 350 via the 342.

Select the path to maximize the data transmission path.

가 상기 송신 장치(300)으로부터 수신 장치(350)까지 직접 데이터가 전송되는 경우의 데이터 전송률

보다 커야 한다.In order for the path for transmitting data from the transmitting apparatus 300 to the receiving apparatus 350 via the i-th relay apparatuses 341 and 342 to be effective, the i-th relay apparatus from the transmitting apparatus 300 as shown in Equation 5 below. The amount of information that can be transmitted in consideration of being transmitted during the first time interval 210 on the path to (341, 342).

Transmission rate when data is directly transmitted from the transmitting device 300 to the receiving device 350

Must be greater than

[Equation 5]

는 전체 시간 프레임의 길이

에 대한 상기 송신 장치(300)가 i번째 중계 장치(341, 342)에게 데이터를 송신하는 시간의 길이

의 비이고,

는 상기 송신 장치(300)에서 i번째 중계 장치(341, 342)까지의 경로의 전송 이득으로서 채널 상태 정보

의 절대값을 제곱하여 얻을 수 있다.

는 상기 송신 장치(300)가 i번째 중계 장치(341, 342)로 데이터를 송신하는 송신 전력이다.here

Is the length of the entire time frame

Length of time for which the transmitting device 300 transmits data to the i th relay device 341, 342.

Is rain,

Channel state information as a transmission gain of a path from the transmitting device 300 to the i th relay device 341, 342.

It can be obtained by square the absolute value of.

Denotes transmission power at which the transmission device 300 transmits data to the i-th relay devices 341 and 342.

라고 하면

의 값은 다음의 수학식 6과 같이 정해 진다.If the minimum transmission power value of the transmission device 300 for transmitting at a predetermined data rate in the transmission path from the transmission device 300 to the i-th relay device

Say

The value of is determined as shown in Equation 6 below.

[Equation 6]

는

보다 크거나 최소한 같은 값을 가져야 한다.Therefore, the path connected to the receiving device via the i-th relay devices 341 and 342 is selected as the data transmission path, and in order to transmit data to the receiving device 350, the i-th relay device ( Power Transmitting to 341, 342

Is

It must be greater than or equal to at least the same value.

는 시간 프레임의 길이

에 대한 제1 시간 구간(210)의 길이

의 비인

의 함수이다. 또한

값의 변화에 따라서 송신 장치가 i번째 중계 장치(341, 342)로 데이터를 전송하는 제1 시간 구간의 길이

이 변한다면, 상기 시간 동안 송신 장치가 데이터를 송신하는 데이터 전송률

도

값에 따라서 변한다. 결과적으로 데이터 전송률

으로 전송하기 위해 송신 장치가 i번째 중계 장치(341, 342)로 데이터를 송신하는 송신 전력

도

값에 따라 변하고, 이는 i번째 중계 장치(341, 342)가 수신 장치로 데이터를 송신하는 송신 전력

도 마찬가지다.As can be seen from Equation 4, the amount of information that can be transmitted about a path for transmitting data to the receiving device 350 via the i-th relay devices 341 and 342.

Is the length of the time frame

Length of first time interval 210 for

Rain of

Is a function of. Also

The length of the first time interval in which the transmitting device transmits data to the i-th relay device 341, 342 according to the change of the value.

If is changed, the data rate at which the transmitting device transmits data during the time

Degree

It depends on the value. As a result, the data rate

Transmission power at which the transmitting device transmits data to the i < th >

Degree

Value, which is the transmit power at which the i < th > relay device 341, 342 transmits data to the receiving device.

The same is true.

의 최대값을 계산하고, 상기 최대값을 상기 각각의 경로에 대한 전송 가능한 정보량으로 산출한다. 제어부(330)는 상기 산출한 각각의 경로에 대한 전송 가능한 정보량을 서로 비교하여 전송 가능한 정보량이 최대값이 되는 경로를 데이터 전송 경로로 선택할 수 있다.According to an embodiment of the present invention, the control unit 330 can transmit the amount of information for each path for transmitting data to the receiving device via the i-th relay devices 341 and 342.

The maximum value of is calculated and the maximum value is calculated as the amount of information that can be transmitted for each path. The controller 330 may compare the calculated amount of transmittable information for each path with each other and select a path having a maximum amount of transmittable information as a data transmission path.

에 대한 제1 시간 구간의 길이

의 비인

도 각각의 경로에서 전송 가능한 정보량

가 최대가 되도록 결정할 수 있다.

의 값을 최대화 하는

의 값은, 시간 프레임의 길이

에 대한 상기 송신 장치가 i번째 중계 장치(341, 342)로 데이터를 송신하는 시간

의 길이의 비로서

인

의 범위를 고려하고, 또 송신 장치가 i번째 중계 장치(341, 342)로 데이터를 송신하는 송신 전력

와 i번째 중계 장치(341, 342)가 수신 장치로 데이터를 송신하는 송신 전력

와 관련한 "송신 전력의 제한 조건"을 고려하여 구할 수 있다.According to one embodiment of the invention, the controller 330 is the length of the time frame

Length of the first time interval for

Rain of

The amount of information that can be transmitted in each path

Can be determined to be the maximum.

To maximize the value of

Is the length of the time frame

The time at which the transmitting device transmits data to the i-th relay device 341, 342.

As the ratio of the length of

sign

Transmission power in consideration of the range of and the transmission device to transmit data to the i th relay devices 341 and 342.

Transmission power at which and i-th relay devices 341 and 342 transmit data to the receiving device.

This can be obtained by considering the "restriction conditions of the transmission power" in relation to

의 범위를 고려하여

의 값을 구하는 여러 가지 실시예를 설명하기로 한다.Hereinafter, according to the conditions for each path to be selected as a data transmission path

Considering the scope of

Various embodiments of obtaining the value of will be described.

인 경우를 고려하자.First as the first case,

Consider the case.

이라면,

인 관계가 성립한다.if

If

Relationship is established.

는 i번째 중계 장치에서 수신 장치로 데이터를 송신할 때의 송신 전력으로서 이 값이 '0'이라는 것은 결국 중계 장치를 이용하지 않고, 송신 장치(300)에서 수신 장치(350)으로 직접 데이터를 송신하는 경우를 의미한다. 따라서

가 수학식 7과 같은 범위에 존재하는 경우에는 송신 장치는 수신 장치로 직접 데이터를 전송한다. 따라서 이 경우는 i번째 중계 장치(341, 342)를 경유하여 데이터를 전송하는 경로를 가정하는 경우에는 고려하지 않아도 된다.

Is the transmission power at the time of transmitting data from the i-th relay device to the receiving device. The value of '0' means that the data is directly transmitted from the transmitting device 300 to the receiving device 350 without using the relay device. It means the case. therefore

Is in the range as shown in Equation 7, the transmitting device transmits data directly to the receiving device. Therefore, this case need not be considered in the case of assuming a path for transmitting data via the i-th relay devices 341 and 342.

[Equation 7]

는 중계 장치(341, 342)를 사용하지 않고, 송신 장치(300)가 직접 수신 장치(350)로 데이터를 송신하는 경우에, 소정의 데이터 전송률 이상으로 데이터를 송신하기 위하여 필요한 송신 전력이다.

는 송신 장치(300)에서 수신 장치(350)까지 직접 전송한 경우에 무선 채널의 이득으로서 수신 장치(350)가 송신한 무선 채널의 상태 정보

의 절대값을 제곱하여 구할 수 있다.

는 상기 i번 째 중계 장치(341, 342)에서 수신 장치(350)까지의 무선 채널의 이득으로서 수신 장치가 파일럿 신호를 이용하여 측정한 무선 채널의 상태 정보

의 절대값을 제곱하여 구할 수 있다.

Is a transmission power required for transmitting data at a predetermined data transfer rate or more when the transmitting apparatus 300 directly transmits data to the receiving apparatus 350 without using the relay apparatuses 341 and 342.

Is the gain of the wireless channel in the case of direct transmission from the transmitting device 300 to the receiving device 350, the state information of the wireless channel transmitted by the receiving device 350.

It can be found by square the absolute value of.

Is the gain of the wireless channel from the i-th relay device 341,342 to the receiving device 350, and the state information of the wireless channel measured by the receiving device using the pilot signal.

It can be found by square the absolute value of.

는 수학식 3과 같이 정해지고, 전송 가능한 정보량을 최대화하는

의 값은 '1'이다. 송신 장치가 수신장치로 데이터를 송신하는 송신 전력

는

로 정해지며,

은 '0'의 값을 가진다.The amount of information that can be transmitted in a path for transmitting data from the transmitting device 300 to the receiving device 350 directly.

Is determined by Equation 3, which maximizes the amount of information that can be transmitted.

The value of is '1'. Transmission power at which the transmitting device sends data to the receiving device

Is

Determined by

Has a value of '0'.

이고,

인 경우를 고려하자. 만약 상기의 조건이라면

의 관계가 성립한다. 이 경우에는 송신 장치(300)로부터 i번째 중계 장치(341, 342)를 경유하여 수신 장치(350)까지의 전송 경로에서 전송 가능한 정보량

는 하기 수학식 8와 같이 표현될 수 있다.As the second case,

ego,

Consider the case. If the above conditions

The relationship is established. In this case, the amount of information that can be transmitted in the transmission path from the transmitting device 300 to the receiving device 350 via the i-th relay devices 341 and 342.

May be expressed as Equation 8 below.

[Equation 8]

의 값은 쉽게 알 수 없다.Maximizing Equation 8

The value of is not easily known.

값을 양자화한 복수의 값에 대하여 상기 i번째 중계 장치(341, 342)를 경유하는 경로의 전송 가능한 정보량을 산출할 수 있다, 상기 산출된 전송 가능한 정보량을 서로 비교하여, 상기 산출한 전송 가능한 정보량들 중에서 최대값을 상기 경로에 대한 전송 가능한 정보량으로 결정할 수 있다, 전송 가능한 정보량을 최대화 하는

의 양자화된 값을 산출함으로써, 비록 정확하지는 않으나, 전송 가능한 정보량을 최대화하는

값의 근사치를 얻을 수 있다.According to an embodiment of the present invention the control unit 330 is

The amount of information that can be transmitted in the path via the i-th relay apparatuses 341 and 342 can be calculated with respect to the plurality of values of quantized values. The maximum value can be determined as the amount of information that can be transmitted for the path.

By calculating the quantized value of, it is possible to maximize the amount of information that can be transmitted, although not precisely.

An approximation of the value can be obtained.

는

와 같이 정해진다. 또, i번째 중계 장치(341, 342)가 송신 장치(350)로 데이터를 송신하는 송신 전력

은

로 정해진다.In this case, the transmission power at which the transmission device transmits data to the i-th relay devices 341 and 342.

Is

It is determined as follows. In addition, transmission power at which the i-th relay devices 341 and 342 transmit data to the transmission device 350.

silver

It is decided.

이고,

인 경우를 고려하자. 만약 상기의 조건 이라면,

의 관계가 성립한다. 첫 번째 경우와 마찬가지로,

이라면, 결국 중계 장치를 이용하지 않고, 송신 장치(300)로부터 수신 장치(350)로 직접 데이터를 송신하는 경우를 의미한다. 따라서,

를 만족하는

에 대하여

인 범위에 존재하는 경우에는 송신 장치(300)는 수신 장치(350)로 직접 데이터를 송신한다.As the third case,

ego,

Consider the case. If the above conditions

The relationship is established. As in the first case,

In this case, it means a case where data is directly transmitted from the transmitting device 300 to the receiving device 350 without using a relay device. therefore,

To satisfy

about

When present in the in range, the transmitting device 300 directly transmits data to the receiving device 350.

는 수학식 3과 같이 정해지고, 전송 가능한 정보량을 최대화하는

의 값은 '1'이다. 송신 장치(300)가 수신장치(350)로 데이터를 송신하는 송신 전력

는

로 정해지며,

은 '0'의 값을 가진다.Therefore, the amount of information that can be transmitted in a path for transmitting data directly from the transmitting device 300 to the receiving device 350 directly.

Is determined by Equation 3, which maximizes the amount of information that can be transmitted.

The value of is '1'. Transmission power that the transmission device 300 transmits data to the reception device 350

Is

Determined by

Has a value of '0'.

는 하기 수학식 9과 같이

의 함수로 표현할 수 있다.As a fourth case, if it does not belong to any of the first, second, and third cases, it transmits on the path from the transmitting apparatus 300 to the receiving apparatus 350 via the i-th relay apparatus 341, 342. Possible amount of information

Is as shown in Equation 9 below.

It can be expressed as a function of.

[Equation 9]

의 값은 쉽게 알 수 없다. 그러나, 본 발명의 일실시예에 따르면 제어부(330)는

값을 양자화한 복 수의 값에 대하여 수학식 9에 따라서 상기 i번째 중계 장치(341, 342)를 경유하는 경로의 전송 가능한 정보량을 산출할 수 있다, 상기 산출된 전송 가능한 정보량을 서로 비교하여, 상기 산출한 전송 가능한 정보량들 중에서 최대값을 상기 경로에 대한 전송 가능한 정보량으로 결정할 수 있다, 전송 가능한 정보량을 최대화 하는

의 양자화된 값에 대하여 상기 전송 가능한 정보량을 산출함으로써, 비록 정확하지는 않으나, 전송 가능한 정보량을 최대화하는

값의 근사치를 얻을 수 있다.As in the second case, Equation 9 is to be maximized

The value of is not easily known. However, according to an embodiment of the present invention, the control unit 330

The amount of transmittable information of the route via the i-th relay apparatuses 341 and 342 can be calculated with respect to a plurality of values obtained by quantizing the values, by comparing the calculated transmittable information with each other, The maximum value of the calculated transmittable information amounts may be determined as the transmittable information amount for the path, maximizing the transmittable information amount.

By calculating the amount of information that can be transmitted with respect to the quantized value of, it is possible to maximize the amount of information that can be transmitted, although not precisely.

An approximation of the value can be obtained.

는 하기 수학식 10과 같이 정해 진다.In this case, the transmission power at which the transmission device 300 transmits data to the i-th relay devices 341 and 342.

Is determined as in Equation 10 below.

[Equation 10]

는 하기 수학식 11과 같이 정해진다.In addition, transmission power at which the i-th relay devices 341 and 342 transmit data to the reception device 350.

Is determined by Equation 11 below.

[Equation 11]

값의 영역을 구분하여 도시한 도면이다. 이하 도 4를 참조하여

값의 범위에 따라 각 경로의 전송 가능한 정보량과 송신 장치의 송신 전력, 및 중계 장치의 송신 전력을 산출하는 과정을 상세히 설명한다.4 is based on the transmission power of the transmission apparatus and the transmission power of the relay apparatus.

The figure shows division of a value area. Hereinafter with reference to FIG.

The process of calculating the amount of information that can be transmitted in each path, the transmission power of the transmission device, and the transmission power of the relay device according to the range of values will be described in detail.

의 범위에 대한 첫 번째 도면(410)은 송신 장치(300)의 송신 전력

와 중계 장치(341, 342)의 송신 전력

에 대해 검토한 세 번째 경우에 대하여 도시한 것이다.

The first figure 410 for the range of the transmit power of the transmitting device 300

And transmission power of the relay devices 341 and 342

This is illustrated for the third case examined for.

를 만족하는

에 대하여

인 범위(411)에 존재 하는 경우에는 송신 장치(300)는 수신 장치(350)로 직접 데이터를 전송 한다.

인 범위(412)에서는 송신 장치는 적어도 하나 이상의 중계 장치(341, 342) 중에서 어느 하나를 경유하는 적어도 하나 이상의 경로 중에서 하나의 경로를 선택하여 데이터를 전송하게 된다.

To satisfy

about

If present in the in-range 411, the transmitting device 300 directly transmits data to the receiving device 350.

In the range 412, the transmitting device selects one path among at least one path through one of the at least one relay device 341 and 342 to transmit data.

의 범위에 대한 두 번째 도면(420)은 송신 장치(300)의 송신 전력

와 중계 장치(341, 342)의 송신 전력

에 대해 검토한 세 번째 경우에 대하여 도시한 것이다.

The second figure 420 for the range of the transmit power of the transmitting device 300

And transmission power of the relay devices 341 and 342

This is illustrated for the third case examined for.

을 만족하는

에 대하여

가

인 범위(422)에 존재하면 송신 장치(300)는 직접 수신 장치(350)로 데이터를 전송 하고,

인 범위(421)에 대해서는 송신 장치(300)는 적어도 하나 이상의 중계 장치(341, 342) 중에서 어느 하나를 경유하는 적어도 하나 이상의 경로 중에서 하나의 경로를 선택하여 데이터를 전송 하게 된다.

To satisfy

about

end

In the present range 422, the transmitting device 300 directly transmits data to the receiving device 350.

For the in-range 421, the transmitting device 300 selects one path among at least one path through one of the at least one relay device 341, 342 and transmits data.

인 경우에는 송신 장치(300)는 적어도 하나 이상의 중계 장치(341, 342) 중에서 어느 하나를 경유하는 적어도 하나 이상의 경로 중에서 하나의 경로를 데이터 전송 경로로서 선택할 수 있으나,

인 경우에는 송신 장치(300)는 중계 장치(341, 342)를 경유하는 경로를 데이터 전송 경로로서 선택할 수 없고, 직접 수신 장치(350)로 데이터를 전송하는 경로를 선택할 수 밖에 없다.The important thing to note here

In this case, the transmitting device 300 may select one of the at least one path via any one of the at least one or more relay devices 341 and 342 as a data transmission path.

In this case, the transmitting device 300 cannot select a path via the relay devices 341 and 342 as a data transmission path, and can only select a path for directly transmitting data to the receiving device 350.

인 조건을 만족해야 한 다.Therefore, the controller 330 always selects a path via the i-th relay device 341, 342 as a data transmission path.

Conditions must be met.

의 범위에 대한 세 번째 도면(430)은 i번째 중계 장치(341, 342)에 대한 경로를 고려하는 경우에

인 조건에 따라서

의 영역을 구분한 것이다. 제1, 제4 구간(431, 434)에서는 송신 장치는 직접 수신 장치로 데이터를 전송 하므로, i번째 중계 장치(341, 342)를 경유하는 경로를 고려하는 경우에는 제1, 제4 영역(431, 434)의

값에 대해서는 고려할 필요는 없다. 여기서 송신 장치의 송신 전력

와 중계 장치의 송신 전력

에 대해 검토한 두 번째와 네 번째의 경우를 고려하면,

를 만족하는

에 대해서,

가

인 제2 영역(432)에 존재하는 경우에는 두 번째 경우에 해당하고,

인 제3 영역(434)에 존재하는 경우에는 네 번째 경우에 해당한다. 따라서

가 제2 영역(432)에 존재하는 경우에는 상기 경로의 전송 가능한 정보량

는 수학식 8과 같이 정해진다. 만약

가 제4 영역(434)에 존재하는 경우에는 상기 경로의 전송 가능한 정보량

는 수학식 9와 같이 정해진다.

The third figure 430 for the range of is taken into account when considering the path to the i th relay device 341, 342.

Depending on the condition

It is a division of the area. In the first and fourth sections 431 and 434, since the transmitting device directly transmits data to the receiving device, when considering a path passing through the i-th relay devices 341 and 342, the first and fourth areas 431 are used. , 434)

There is no need to consider the value. Where the transmit power of the transmitting device

And transmission power of the repeater

Considering the second and fourth cases we reviewed for,

To satisfy

about,

end

If present in the second area 432 is the second case,

In the third region 434, the fourth case corresponds to the fourth case. therefore

Is present in the second area 432, the amount of information that can be transmitted in the path

Is determined as in Equation 8. if

Is present in the fourth area 434, the amount of information that can be transmitted in the path.

Is determined as in Equation (9).

를 산출하는데 있어, 상기 경로가 i번째 중계 장치(341, 342)를 경유하여 수신 장치(350)로 데이터를 전송하는 경로라면, 먼저 무선 채널 상태 정보를 이용하여

,

,

의 값을 계산하고,

인 조건을 만족하는지 확인할 수 있다. 만약 상기 조건을 만족하지 못한다면, 상기 i번째 중계 장치(341, 342)를 경유하는 경로는 데이터 전송 경로로서 선택 받을 수 없으므로 상기 경로에 대해서는 더 이상 전송 가능한 정보량을 산출하지 않을 수 있다.The control unit 330 according to an embodiment of the present invention is the amount of information that can be transmitted in each path

In the calculation, if the path is a path for transmitting data to the receiving device 350 via the i th relay devices 341 and 342, first, the wireless channel state information is used.

,

,

Calculate the value of,

It can be checked whether the condition is satisfied. If the condition is not satisfied, the path via the i-th relay devices 341 and 342 may not be selected as the data transmission path, and thus the amount of information that can be transmitted may not be calculated for the path.

를 산출하는데 있어,

인 영역에 대해서만 전송 가능한 정보량을 산출할 수 있다.The control unit 330 according to an embodiment of the present invention is the amount of information that can be transmitted on the path via the i-th relay device.

In calculating

The amount of information that can be transmitted can be calculated only for the phosphorus region.

The controller 330 according to an embodiment of the present invention calculates the amount of information that can be transmitted for each path, as discussed above. The controller 330 may select a path that maximizes the calculated amount of transmittable information as a data transmission path.

5 is a diagram showing a beamforming vector according to the present invention on a vector plane. Hereinafter, a process of obtaining a beamforming vector when the transmitter transmits data by performing beamforming to a relay device located on a transmission path will be described in detail with reference to FIG. 5.

According to an embodiment of the present invention, a transmitting device connected to a receiving device using at least one relay device includes: a receiving unit receiving state information of a wireless channel from at least one relay device and the receiving device, and a state of the received wireless channel. And a control unit for selecting any one of at least one or more paths for transmitting data to the receiving device via any one of the at least one relay device based on the information. The transmitting device includes a plurality of transmit antennas, and the controller generates a beamforming vector associated with the plurality of transmit antennas. In particular, the transmitter performs beamforming using the generated beamforming vector to transmit data to a relay device located on the data transmission path.

According to an embodiment of the present invention, the transmitting unit transmits data to a relay device located on the data transmission path in a first time interval that does not overlap a second time interval in which the relay device located on the data transmission path transmits data to the receiving device. Can be sent.

In order to minimize the probability of occurrence of communication failure even when beamforming is performed, a path having the maximum amount of transmittable information among at least one path for transmitting data from the transmitting device to the receiving device via at least one or more relay devices may be selected. There is no change in the choice of the data transmission path. In this case, of course, the amount of information that can be transmitted can be calculated in consideration of the transmitter performing beamforming.

In addition, the beamforming vector used by the receiver must also be determined so that the amount of information that can be transmitted in the path from the transmitter to the receiver via the relay device located on the transmission path is maximum.

를 이용하여 빔포밍을 수행하여 i번째 중계 장치로 데이터를 전송한다면, 빔포밍을 고려한 상기 경로에서 전송 가능한 정보량

는 하기 수학식 12에 의해서 정해진다.If the transmitting device is a beamforming vector associated with a plurality of transmit antennas

If the data is transmitted to the i-th relay apparatus by beamforming by using a beamforming, the amount of information that can be transmitted in the path considering beamforming

Is determined by the following equation (12).

[Equation 13]

는 송신 장치가 사용하는 빔포밍 벡터

(540)의 켤레 복소 벡터,

(512)는 송신 장치에서 수신 장치까지의 무선 채널에 대한 무선 채널 상태 벡터

(511)를 정규화한 벡터를 각각 의미한다.

는 전체 시간 프레임의 길이에 대한 송신 단말이 데이터를 송신하는 시간 구간 길이의 비이다.

는 상기 송신 장치에서 상기 수신 장치까지 직접 전송한 경우에 무선 채널의 이득으로서 수신 장치가 송신한 무선 채널의 상태 정보

(511)의 절대값을 제곱하여 구할 수 있다.

는 상기 i번째 중계 장치에서 수신 장치(350)까지의 무선 채널의 이득으로서 수신 장치가 파일럿 신호를 이용하여 측정한 무선 채널의 상태 정보

의 절대값을 제곱하여 구할 수 있다.here,

Is the beamforming vector used by the transmitter

540 pairs of complex vectors,

512 is a radio channel state vector for a radio channel from a transmitting device to a receiving device

Each means the vector which normalized (511).

Is the ratio of the length of time interval in which the transmitting terminal transmits data to the length of the entire time frame.

Is the gain of the radio channel in the case of direct transmission from the transmitter to the receiver, and state information of the radio channel transmitted by the receiver

It can be found by square the absolute value of (511).

Is the gain of the wireless channel from the i-th relay device to the reception device 350, and the state information of the wireless channel measured by the reception device using a pilot signal.

It can be found by square the absolute value of.

(540)는 송신 장치가 빔포밍을 수행하는데 이용되며, 그 크기가 1인 단위 벡터이다. 빔포밍 벡터

(540)는 수신 장치와 적어도 하나 이상의 중계 장치가 송신한 무선 채널 상태에 기초하여 분석될 수 있다.Beamforming Vectors Associated with Multiple Transmit Antennas

540 is used by the transmitting apparatus to perform beamforming, and is a unit vector having a size of one. Beamforming vector

540 may be analyzed based on a wireless channel condition transmitted by the receiving device and at least one relay device.

(531)의 크기를 정규화한

(532)는 송신 장치에서 수신 장치까지의 무선 채널의 무선 채널 상태 벡터

(511)와 상기 무선 채널 상태 벡터와 직교하는 벡터

(521)를 이용하여 하기 수학식 13과 같이 표현할 수 있다.First, the radio channel state vector of the radio channel from the transmitting device to the i-th relay device

Normalized size of (531)

532 is a radio channel state vector of a radio channel from a transmitting device to a receiving device

511 and a vector orthogonal to the radio channel state vector

By using (521) it can be expressed as Equation 13.

[Equation 13]

(522)는

(511)와 직교 하는 단위 벡터이고,

(542)는

(512)와

(532)의 각도 차이이다.

(511)를 기준으로 하여

(532)를 분해했을 때,

(513)는

(532)의

(511)방향의 성분이고,

(523)는

(532)의

(522) 방향의 성분이다.

522 is

Is a unit vector orthogonal to (511),

542 is

With 512

532 is the angle difference.

On the basis of (511)

When you disassemble (532),

513 is

(532)

Component in the (511) direction,

523 is

(532)

It is a component of the (522) direction.

(540)는 하기 수학식 14와 같이 표현 할 수 있다.Based on the analysis result, the beamforming vector

540 may be expressed as Equation 14 below.

[Equation 14]

(512)는 송신 장치에서 수신 장치까지의 무선 채널에 대한 무선 채널 상태 벡터

(511)를 정규화한 벡터이고,

(522)는

(511)와 직교 하는 단위 벡터이다.

(541)는 상기 빔포밍 벡터와 송신 장치에서 수신 장치까지의 무선 채널에 대한 무선 채널 상태 벡터

(511)와의 각도 차이(또는 사이의 각)를 나타낸다.

512 is a radio channel state vector for a radio channel from a transmitting device to a receiving device

Is a vector normalized to (511),

522 is

Unit vector orthogonal to (511).

541 is a radio channel state vector for the beamforming vector and a radio channel from a transmitting device to a receiving device.

An angle difference (or angle between) with 511 is shown.

는 하기 수학식 15에 의해서 정해진다.Considering Equation 14, the amount of information that can be transmitted in the path considering beamforming

Is determined by the following equation (15).

[Equation 15]

는 전체 시간 프레임의 길이에 대한 송신 단말이 데이터를 송신하는 시간 길이의 비이다.

는 상기 송신 장치에서 상기 수신 장치까지 직접 전송한 경우에 무선 채널의 이득으로서 수신 장치가 송신한 무선 채널의 상태 벡터

(511)의 크기를 제곱하여 구할 수 있다.

는 상기 i번째 중계 장치에서 수신 장치(350)까지의 무선 채널의 이득으로서 수신 장치가 파일럿 신호를 이용하여 측정한 무선 채널의 상태 정보

의 절대값을 제곱하여 구할 수 있다.

(541)는 상기 빔포밍 벡터와 송신 장치에서 수신 장치까지의 무선 채널에 대한 무선 채널 상태 벡터

와의 각도 차이를 나타낸다.

Is the ratio of the length of time that the transmitting terminal transmits data to the length of the entire time frame.

Is a gain of the radio channel when the transmitter directly transmits from the transmitter to the receiver, and is a state vector of the radio channel transmitted by the receiver

It can be found by squaring the size of (511).

Is the gain of the wireless channel from the i-th relay device to the reception device 350, and the state information of the wireless channel measured by the reception device using a pilot signal.

It can be found by square the absolute value of.

541 is a radio channel state vector for the beamforming vector and a radio channel from a transmitting device to a receiving device.

The angle difference with

는 중계 장치의 인덱스 i와,

와

(541)의 함수이다.As described above, when the path via the i-th relay apparatus is selected as the data transmission path, the amount of information that can be transmitted in the path

Is the index i of the relay device,

Wow

(541) is a function.

는 0과 1사이에 존재하는 값이고,

(541)는 0과

(542)사이에 존재하 는 값이다. 따라서, i번째 중계 장치에 대하여

와

(541)의 값을 변화시키며 상기 i번째 중계 장치를 포함하는 경로에서 전송 가능한 정보량

를 계산하고, 상기

값이 최대가 되는

와

(541)의 값을 선택하는 것이 상기 경로에서 전송 가능한 정보량

를 최대화 하는 중계 장치를 선택하는 일이 된다.

Is a value between 0 and 1

541 is 0 and

The value exists between (542). Thus, for the i th relay device

Wow

The amount of information that can be transmitted in the path including the i-th relay device by changing a value of 541.

Calculate and remind

The maximum value

Wow

The amount of information that can be transmitted on the path by selecting a value of 541

Choosing a relay that maximizes

와

(541)의 양자화된 값의 조합에 대하여 최대 데이터 전송률을 산출한다. 최대 데이터 전송률은

와

(541)의 조합에 대해 i번째 중계 장치를 경유하는 경로에서 전송 가능한 정보량으로 정의된다. 상기 산출한 최대 데이터 전송률 중에서 최대값이 i번째 중계 장치를 경유하는 경로에서의 전송 가능한 정보량으로 결정한다. 다음으로, 각각의 경로에서 산출된 전송 가능한 정보량들을 서로 비교하여, 그 전송 가능한 정보량들 중에서 최대값에 상응하는 경로를 데이터 전송 경로로 선택할 수 있다. 이와 같이, 전송 가능한 정보량을 최대화 하는

와

(541)의 양자화된 값의 조합을 산출함으로써, 비록 정확하지는 않으나, 전송 가능한 정보량을 최대화 하는

와

(541)의 근사치를 얻을 수 있다.According to an embodiment of the present invention the control unit 330 is

Wow

The maximum data rate is calculated for the combination of 541 quantized values. Maximum data rate is

Wow

The combination of 541 is defined as the amount of information that can be transmitted in the path via the i-th relay device. The maximum value among the calculated maximum data rates is determined as the amount of information that can be transmitted on the path via the i-th relay device. Next, by comparing the amount of transmittable information calculated in each path, a path corresponding to the maximum value among the amount of transmittable information can be selected as the data transmission path. In this way, to maximize the amount of information that can be transmitted

Wow

By calculating the combination of 541 quantized values, it is possible to maximize the amount of information that can be transmitted, although not precisely.

Wow

An approximation of 541 can be obtained.

(511)값을 선택하면 수학식 14에서 데이터 전송 경로상에 위 치한 중계 장치를 경유하여 수신 장치까지 데이터를 송신하는 데이터 전송 경로에서 전송 가능한 정보량을 최대화 하는 빔포밍 벡터

(540)를 얻을 수 있다.As above

If a value of (511) is selected, the beamforming vector maximizes the amount of information that can be transmitted in the data transmission path for transmitting data to the receiving device via a relay device located on the data transmission path in Equation 14;

540 can be obtained.

값을 선택하면 데이터 전송 경로상에 위치한 중계 장치를 경유하여 수신 장치까지 데이터를 송신하는 데이터 전송 경로에서 전송 가능한 정보량을 최대화 하는 전체 시간 프레임의 길이에 대한 상기 송신부가 데이터를 송신하는 시간 길이의 비를 얻을 수 있다.Again as above

If a value is selected, the ratio of the length of time that the transmitter transmits data to the length of the entire time frame maximizes the amount of information that can be transmitted in the data transmission path transmitting data to the receiving device via a relay device located on the data transmission path. Can be obtained.

값이 정해지면 수학식 8와 수학식 9에서, 상기 송신부로부터 데이터 전송 경로상에 위치한 중계 장치로 데이터를 송신하는 송신 전력과, 상기 데이터 전송 경로상에 위치한 중계 장치로부터 수신 장치로 데이터를 송신하는 송신 전력을 얻을 수 있다.

When the value is determined, in Equation 8 and Equation 9, transmission power for transmitting data from the transmitter to the relay device located on the data transmission path, and data transmitted from the relay device located on the data transmission path to the receiver device are shown. The transmission power can be obtained.

6 is a block diagram showing the configuration of the relay apparatus 600 according to the present invention. Hereinafter, the structure of the relay device will be described in detail with reference to FIG. 6. As illustrated in FIG. 6, the relay device 600 includes a receiver 610, a controller 620, and a transmitter 630.

The receiver 610 receives the first pilot signal from the transmitter 640, and the controller 620 measures the state of the radio channel from the transmitter 640 using the received first pilot signal.

The transmitter 630 transmits the state information of the radio channel generated by measuring the state of the radio channel to the transmitter 640, and transmits a second pilot signal to the receiver 650.

If the transmission device 640 selects a path via the relay device 600 from among at least one or more paths for transmitting data to the receiving device 650 via any one of at least one relay device as a data transmission path. If so, the relay device receives first data from the transmission device through the receiver 610.

According to an embodiment of the present invention, the transmitter 630 may be configured to store the received first data in a first time interval that does not overlap with a second time interval in which the receiver 610 receives the second data from the transmitter 640. You can send to the receiving device.

According to an embodiment of the present invention, the length of the first time interval is transmitted in the transmission path from the transmitting device 640 to the receiving device 650 via the relay device 600 located on the data transmission path. The amount of information possible is determined to be the maximum. The relay device located on the transmission path receives the length of the first time interval determined by the transmission device 640 through the receiver 610 and receives the data received in the second time interval that does not overlap the first time interval. It transmits to the receiving device 650.

The transmission power that the transmitter 630 transmits data to the receiver is transmitted to the receiver 650 via the relay device 600 in which the transmitter 640 is located on the transmission path from the transmitter 640. The maximum amount of information that can be transmitted in the data transmission path for transmitting data is determined. The relay device located on the transmission path receives the transmission power of the relay device located on the transmission path determined by the transmission device 640 through the receiver 610.

7 is a block diagram showing the configuration of a receiving apparatus 700 according to the present invention. Hereinafter, the structure of the receiving device will be described in detail with reference to FIG. 7.

The receiver 710 receives the first pilot signal from the transmitter 760, and receives the second pilot signal from the at least one relay device 740, 750.

The controller 720 measures the state of the radio channel from the transmitting device 760 and the state of the radio channel from the at least one relay device 740 or 750 using the received first and second pilot signals. do.

The transmitter 730 transmits the radio channel state information generated by measuring the state of the radio channel to the transmitter 760.

The transmitting device 760 may include the at least one relay device based on the state information of the wireless channel received from the receiving device 700 and the state information of the wireless channel received from the at least one relay device 740, 750. A path for transmitting data to the receiving device 600 via any one of 740 and 750 is selected as the data transmission path. In FIG. 7, it is assumed that a path via the first relay device 740 is selected as a data transmission path.

The transmitting device 760 transmits data to the relay device 740 located on the data transmission path, and the relay device 740 transmits the received data to the receiving device 700 again. The reception device 700 receives data transmitted by the relay device 740 located on the data transmission path through the reception unit 710.

8 is a flowchart illustrating the operation of the transmission method according to the present invention. Hereinafter, a transmission method according to the present invention will be described in detail with reference to FIG. 8.

In step S810, the transmitting device transmits a pilot signal to the receiving device and at least one relay device. The at least one relay apparatus and the receiving apparatus which have received the pilot signal measure the state of the radio channel with respect to the radio channel from the transmitter using the pilot signal to generate state information of the radio channel.

In step S820, the transmitting device receives the state information of the radio channel from the receiving device and the at least one relay device. The at least one relay device receives only the state information of the radio channel measured for the radio channel from the transmitter to the at least one relay device measured using the pilot signal transmitted by the transmitter. The receiving device receives the radio channel state information on the radio channel from the transmitting device to the receiving device generated by the receiving device using the first pilot signal transmitted by the transmitting device. The transmitting device also receives radio channel state information for a radio channel from the at least one relay device to the receiving device, measured by the receiving device using the second pilot signal transmitted by the at least one relay device.

In step S830, one of at least one or more paths for transmitting data to a receiving device via any one of the at least one or more relay devices is selected as a data transmission path based on the received state information on the wireless channel. do.

According to an embodiment of the present invention, a data transmission path may be selected so that the amount of information that can be transmitted is maximized with respect to a path from a transmitting device to at least one relay device to a receiving device.

According to an embodiment of the present invention, there is provided a transmission power for transmitting data from a transmitting device to a relay device located on a transmission line such that the amount of information that can be transmitted on the path from the transmitting device to the receiving device via at least one relay device is maximum; The transmission power for transmitting data from the relay apparatus located on the transmission line to the receiving apparatus can be determined.

In step S840, the transmitting device transmits data to the relay device located on the data transmission path. The transmitting device may transmit data to the relay device located on the data transmission path in a first time period that does not overlap the second time period in which the relay device located on the data transmission path transmits data to the receiving device.

The length of the first time interval in the specific time frame is selected such that the amount of information that can be transmitted is maximized with respect to a path for transmitting data from the transmitting device to the receiving device via the at least one or more relay devices.

9 is a flowchart illustrating the operation of the relay method according to the present invention. Hereinafter, a relay method according to the present invention will be described in detail with reference to FIG. 9.

In step S910, the relay device receives a pilot signal from a transmitter.

In step S920, the wireless channel state is measured for the wireless channel from the transmitting apparatus to the relay apparatus using the received pilot signal.

In step S930, the measured state information of the wireless channel is transmitted to the transmitter.

The transmitting device selects any one of the at least one path for transmitting data to the receiving device via at least one of the at least one relay device based on the received state information of the wireless channel as the data transmission path. The transmitting device transmits a predetermined signal to the relay device located on the path selected as the data transmission path to notify that the path via the relay device is selected as the data transmission path.

In step S940, the relay device checks whether a path for transmitting data to the receiving device via itself using the predetermined signal is selected as the data transmission path.

If it is selected as the data transmission path, in step S950, data is received from the transmitting device. Since the transmitting device transmits data only in the first time period within a specific time frame, the relay device also receives data only in the first time period.

In step S960, the received data is transmitted to the receiving device in a second time interval that does not overlap the first time interval.

The power for transmitting data by the relay apparatus located on the data transmission path is determined to be the maximum amount of information that can be transmitted in the path for transmitting data from the transmitting apparatus to the receiving apparatus via the relay apparatus. The relay device located on the data transmission path receives the determined transmission power value from the transmission device and transmits data in accordance with the received transmission power value.

If the path via the relay device is not selected as the data transmission path, the relay device does not receive data from the transmitting device.

10 is a flowchart illustrating the operation of the receiving method according to the present invention. Hereinafter, the operation of the reception method according to the present invention will be described in detail with reference to FIG. 10.

In step S1010, the receiving device receives the first pilot signal from the transmitting device, and receives the second pilot signal from the at least one relay device.

In operation S1020, a wireless channel state is measured for a wireless channel from a transmitting device to the receiving device using the received first pilot signal, and the at least one relay device using the received second pilot signal. The radio channel condition is measured for the radio channel from the receiver to the receiving device.

In step S1030, the radio channel state measured using the first and second pilot signals is transmitted to the transmitting apparatus.

The transmitting device selects any one of the at least one path for transmitting data to the receiving device via any one of the at least one relay device based on the measured radio channel condition as the data transmission path.

In step S1040, data is received from the relay apparatus located in the selected data transmission path.

Embodiments of the invention also include computer-readable media containing 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 program instructions may be those specially designed and configured for the present invention, or may be known and available to those skilled in the art. 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. When all or part of the operation of the mobile terminal or base station described in the present invention is implemented as a computer program, a computer readable recording medium storing the computer program is also included in the present invention.

According to the present invention, the terminal that has received data from the transmitting apparatus can improve communication quality by operating as a relay apparatus for another terminal.

According to the present invention, by selecting a data transmission path via any one of the plurality of relay devices, and transmitting data through the relay device located in the data transmission path, it is possible to improve communication quality and increase the data transmission rate The effect can be obtained.

According to the present invention, a data transmission path via any one of a plurality of relay devices is selected, and data is transmitted through a relay device located on the data transmission path, thereby directly receiving at the transmitter without passing through the relay device. A method and apparatus can be provided in which the sum of the transmission powers of the transmitting apparatus and the relay apparatus is smaller than when data is transmitted to the apparatus.

According to the present invention, when a transmitting device performs beamforming using a plurality of antennas and beamforming vectors, the present invention provides beamforming for a terminal that receives data from the transmitting device and operates as a relay device for another terminal. A method and apparatus for determining a beamforming vector are provided.

Claims (36)

A transmitting device having at least one relay device and a receiving unit for receiving state information of a radio channel from a receiving device, the transmitting device comprising: Selecting one of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device based on the received state information of the wireless channel; Control unit; And Transmitter for transmitting data to the relay device located on the data transmission path in a first time interval that does not overlap the second time interval for the relay device located on the data transmission path to transmit data to the receiving device Transmission device comprising a. The method of claim 1, wherein the control unit, Calculating the amount of information that can be transmitted for each of at least one or more paths for transmitting data from the transmitting device to the receiving device via any one of the at least one or more relay devices, using the received state information of the wireless channel, Selecting a path for maximizing the calculated transmittable information amount as the data transmission path Transmitter characterized in that. The method of claim 2, wherein the control unit, Calculating the amount of information that can be transmitted for the quantized values of the time at which the transmitting device transmits data to the relay device in each path, And a maximum value of the calculated transmittable information amounts is determined as the transmittable information amount for each path. The method of claim 3, wherein the control unit, T1 for the sum T of the length T1 of the time interval in which the transmitting device transmits data to the relay device and the length T2 of the time interval in which the relay device transmits the data to the receiving device in each path. And the ratio of the ratio is not calculated when the ratio is within a predetermined range. The method of claim 4, wherein The predetermined range is Data rate and transmission power when data is directly transmitted from the transmitting apparatus to the receiving apparatus, Channel status information for radio channels from the transmitting device to the relay device It is determined in consideration of the transmission apparatus. The method of claim 4, wherein The predetermined range is determined by the following equation (1). [Equation 1]

being.

silver

As a value satisfying

If the data is sent directly from the transmitting device to the receiving device, the predetermined data rate

This is the transmission power for transmitting data. here,

Is determined by Equation 2 below. [Equation 2]

Is the transmission gain of the path from the transmitting device to the i-th relay, and channel state information for the wireless channel from the transmitting device to the i-th relay

Obtained by square the absolute value of. The method of claim 4, wherein And the predetermined range is determined in consideration of data rate and transmission power in case of transmitting data directly from the transmitting apparatus to the receiving apparatus, and channel state information on the radio channel from the transmitting apparatus to the relay apparatus. The method of claim 4, wherein The predetermined range is determined by the following equation (1). [Equation 1]

being.

Is determined as in Equation 2. [Equation 2]

Is the transmission power for transmitting data at a predetermined data transmission rate or more when transmitting data directly from the transmitting apparatus to the receiving apparatus.

Is the gain of the wireless channel when transmitting data directly from the transmitting apparatus to the receiving apparatus, the state information of the wireless channel between the transmitting apparatus and the receiving apparatus.

Obtained by square the absolute value of.

Is the gain of the wireless channel from the i-th relay device to the receiving device, and state information of the wireless channel

Obtained by square the absolute value of. The method of claim 3, wherein the control unit, For each path, the sum T of the length T1 of the time interval in which the transmitting device transmits data to the relay device and the length T2 of the time interval in which the relay device transmits data to the receiving device. And when the ratio of T1 satisfies a predetermined equation, the amount of transmittable information is not calculated in consideration of the magnitude relationship between different ratios satisfying the equation. The method of claim 9, The equation is Data rate and transmission power in case of transmitting data directly from the transmitting apparatus to the receiving apparatus, Channel state information from the transmitting device to the relay device, Status information of a radio channel between the transmitting apparatus and the receiving apparatus in the case of directly transmitting data from the transmitting apparatus to the receiving apparatus, and Status information of the radio channel from the relay device to the receiving device It is determined in consideration of the transmission apparatus. The method of claim 9, Wherein the equation is determined as in Equation 1 below. [Equation 1]

silver

Is a value satisfying

Is a predetermined data rate when transmitting data directly from a transmitting device to a receiving device

This is the transmission power for transmitting data.

Is determined as in Equation 2. [Equation 2]

Is the transmission gain of the path from the transmitting device to the i-th relay, indicating channel state information.

Obtained by Square the Absolute Value of

Is determined by Equation 3 below. [Equation 3]

Is the transmission power for transmitting data at a predetermined data transmission rate or more when transmitting data directly from the transmitting apparatus to the receiving apparatus.

Is the gain of the wireless channel when transmitting data directly from the transmitting apparatus to the receiving apparatus, and is a state information of the wireless channel between the transmitting apparatus and the receiving apparatus.

Obtained by square the absolute value of.

Is the gain of the wireless channel from the i-th relay device to the receiving device, and state information of the wireless channel

Obtained by square the absolute value of. The method of claim 1, And the control unit determines the length of the first time interval so that the amount of information that can be transmitted in the selected data transmission path is maximum. The method of claim 1, wherein the control unit, And the transmitter determines transmission power for transmitting data to a relay device located in the data transmission path based on the length of the first time interval. The method of claim 1, wherein the control unit, And a transmission apparatus for transmitting data to the receiving apparatus by the relay apparatus located on the transmission path based on the length of the first time interval. The method of claim 1, The transmitter transmits pilot signals to the at least one relay device and the receiver, respectively. The receiving unit receives the state information of the wireless channel using the pilot signal from the at least one relay device and the receiving device. Transmitter characterized in that. The method of claim 1, Multiple transmitting antennas More, The controller generates a beamforming vector associated with the plurality of transmit antennas, And the transmitting unit performs beamforming by using the generated beamforming vector, and transmits the data to a relay device located on the data transmission path. The method of claim 16, wherein the control unit, Calculating the amount of information that can be transmitted for each path in consideration of the radio channel state vector and the beamforming vector of the radio channel of the path directly connected from the transmitter to the receiver, And selecting a path that maximizes the calculated amount of transmittable information as the data transmission path. The method of claim 16, wherein the control unit, And the beamforming vector is determined from a radio channel state vector of the radio channel of a path directly connected from the transmitter to the receiver so that the amount of transmittable information of each path is maximum. The method of claim 17, wherein the control unit, Calculate a maximum data rate in each path for each quantized value between the radio channel state vector and the beamforming vector, And a maximum value of the calculated maximum data rates is determined as an amount of information that can be transmitted for each path. A transmitting device connected to a receiving device using at least one relay device, A controller for selecting any one of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device as a data transmission path; And Transmitter for transmitting data to the receiving device through the selected data transmission path Including, The controller may be configured for each of the one or more paths. The length of time interval at which the transmitting device transmits data to the relay device, The length of time period for which the relay device transmits data to the receiving device, Radio channel status information between the relay device and the receiving device, Radio channel state information between a transmitting device and a receiving device, and The amount of information that can be transmitted is measured in consideration of the respective transmission powers when the transmitting device and the relay device transmit data, And selecting a path that maximizes the measured amount of transmittable information as the data transmission path. The transmission apparatus according to claim 20, wherein the amount of information that can be transmitted is determined using the following equation.  [Equation]

T1 / (T1 + T2) T1: length of the first time interval at which the transmitting device transmits data to the relay device T2: length of the second time interval when the relay device sends data to the receiving device

Is the gain of the wireless channel of the path that is directly connected from the transmitting device to the receiving device, and the wireless channel state information of the path

Calculated by square the absolute value of

Is the gain of the radio channel of the path from the i th relay device to the receiving device, and the radio channel state information of the path

Calculated by square the absolute value of

Is the transmission power of the transmission device when the transmission device transmits data to the i-th relay device,

Is the transmit power of the i th relay device when the i th relay device transmits data to the receiving device. A transmitting device connected to a receiving device using at least one relay device, A plurality of transmit antennas; A beamforming vector associated with the plurality of transmitting antennas is calculated and any one or more paths for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device are selected as data transmission paths. A control unit for selecting; And A transmitter for beamforming by using the calculated beamforming vector and transmitting data to the receiving apparatus through the selected data transmission path. Including, The controller may be configured for each of the one or more paths. The length of time interval at which the transmitting device transmits data to the relay device, The length of time the relay device sends data to the receiving device, Radio channel status information between the relay device and the transmitting device, Radio channel state information between a transmitting device and a receiving device, A radio channel state vector and a beamforming vector of a radio channel in a path directly connected from a transmitting device to a receiving device, and The amount of information that can be transmitted is measured in consideration of the respective transmission powers when the transmitting device and the relay device transmit data, And selecting a path that maximizes the measured amount of transmittable information as the data transmission path. 23. The apparatus of claim 22, wherein the amount of information that can be transmitted is determined using the following equation. [Equation]

T1 / (T1 + T2) T1: length of the first time interval at which the transmitting device transmits data to the relay device T2: length of the second time interval when the relay device sends data to the receiving device

Is the gain of the radio channel of the path that is directly connected from the transmitting device to the receiving device, and is the radio channel state vector of the path

Calculated by Square the Size of

Is the gain of the radio channel of the path from the i th relay device to the receiving device, and the radio channel state information of the path

Calculated by square the absolute value of

Is the transmission power of the transmission device when the transmission device transmits data to the i-th relay device,

Is the transmission power of the i th relay device when the i th relay device transmits data to the receiving device,

Is an angle between a radio channel state vector of a radio channel in a path that is directly connected from a transmitting device to a receiving device and a beamforming vector associated with the plurality of transmitting antennas. A transmitting device connected to a receiving device using at least one relay device, A receiver configured to receive state information of a radio channel from the at least one relay device and the receiver device; Selecting one of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device based on the received state information of the wireless channel; Control unit; And Transmitter for transmitting data to the receiving device through the selected data transmission path Including, And the control unit determines transmission power for transmitting data to the relay unit located in the data transmission path such that the amount of information that can be transmitted in the data transmission path is maximum. A transmitting device connected to a receiving device using at least one relay device, A receiver configured to receive state information of a radio channel from the at least one relay device and the receiver device; Selecting one of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device based on the received state information of the wireless channel; Control unit; And Transmitter for transmitting data to the receiving device through the selected data transmission path Including, And the control unit determines a transmission power for transmitting data to a receiving device by a relay device located on the data transmission path such that the amount of information that can be transmitted in the data transmission path is maximum. A transmitting device connected to a receiving device using at least one relay device, A receiver configured to receive state information of a radio channel from the at least one relay device and the receiver device; Selecting one of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device based on the received state information of the wireless channel; Control unit; And Transmitter for transmitting data to the receiving device through the selected data transmission path Including, The controller may include a length of a first time interval during which the transmitter transmits first data to a relay device located in the data transmission path such that the amount of information that can be transmitted in the data transmission path is maximum, and the relay device located in the data transmission path includes: And a length of a second time interval for transmitting the second data to the receiving device. In the wireless relay device connecting the transmitting device and the receiving device, A control unit measuring state information of a wireless channel with the transmitting device; A transmitter for transmitting the measured state of the wireless channel to the transmitter Including, The receiving unit receives first data from the transmitting device based on the transmitted state information of the wireless channel and the state information of the wireless channel with the receiving device, And the transmitting unit transmits the received first data to the receiving apparatus in a first time interval which does not overlap with a second time interval in which the receiving unit receives the second data from the transmitting apparatus. The method of claim 27, wherein the transmitting unit, And transmitting data to the receiving device according to the transmission power determined to be the maximum amount of information that can be transmitted in the data transmission path for transmitting data from the transmitting device to the receiving device via the relay device. The method of claim 27, The length of the first time interval is determined to be the maximum amount of information that can be transmitted in the data transmission path for transmitting data from the transmitting device to the receiving device via the relay device, The transmitting unit, characterized in that for transmitting the data to the receiving device during the determined first time interval. In the wireless transmission method connected to the receiving device using at least one relay device, Receiving state information of a radio channel from the at least one relay device and the receiving device; Selecting one of at least one path for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device based on the received state information of the wireless channel; step; Transmitting data to the receiving device via the selected data transmission path; And Transmitting, by the relay apparatus located on the data transmission path, the data to the relay apparatus located on the data transmission path in a first time interval that does not overlap with a second time interval for transmitting data to the receiving apparatus. Wireless transmission method comprising a. The method of claim 30, wherein selecting the data transmission path, Calculating the amount of information that can be transmitted for each of at least one or more paths for transmitting data from the transmitting device to the receiving device via any one of the at least one relay device using the state information of the received wireless channel; ; And Selecting a path for maximizing the calculated amount of transmittable information as the data transmission path Wireless transmission method comprising a. The method of claim 30, wherein selecting the data transmission path, Determining a length of the first time interval such that the amount of information transmittable in the selected data transmission path is maximum Wireless transmission method comprising a. 32. The method of claim 31, wherein selecting the data transmission path comprises: Calculating amounts of information that can be transmitted in each path with respect to quantized values of the time at which the transmitting device transmits data to the relay device in each path; And Calculating a maximum value of the calculated transmittable information amounts as the transmittable information amount for each path; Wireless transmission method comprising a. The method of claim 30, Generating a beamforming vector associated with the plurality of transmit antennas Including, The step of transmitting the data to a relay device located on the selected data transmission path, And performing beamforming by using the calculated beamforming vector, and transmitting the data to a relay apparatus located on the data transmission path. In the wireless signal relay method for connecting a transmitting device and a receiving device, Measuring a state of a wireless channel with the transmitting device; Transmitting the measured state of the wireless channel to the transmitting device; Receiving first data from the transmitting device based on the transmitted state of the wireless channel and the state information of the wireless channel with the receiving device; And Transmitting the received first data to the receiving device at a time that does not overlap with receiving the second data from the transmitting device; Wireless signal relay method comprising a. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 30 to 35.

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