KR102555612B1 - Subframe structure configuration method and response signal replying method, terminal device and base station - Google Patents

Abstract

The present invention provides a new flexible TDD frame structure and a response signal reception (reply) method based on the new flexible TDD frame structure that enables immediate and accurate response signals (Ack/Nack) of a high-speed mobile terminal to be received in 5G, which will appear in the future. By realizing, a technique for maximizing ultra-low latency service performance is disclosed.

Description

Subframe structure configuration method and response signal reply method, terminal device and base station device

The present invention relates to a technology for transmitting data between devices, and more particularly, to a response signal reception technology suitable for a 5G mobile communication network environment of an ultra-low latency service that will appear in the future.

In line with the development of mobile communication networks for high-capacity data/high-speed transmission, mobile communication network environments aiming for ultra reliable & low latency communication (URLLC) services based on near real-time data transmission and reception in the future, such as the 5th generation mobile communication network (hereinafter referred to as , 5G) environment will develop.

Therefore, one of the important factors to realize ultra-low latency service in 5G is to immediately receive the response signal (Ack/Nack) of the receiving end for the transmitted data, and based on this, retransmit the data or set the coding rate when necessary. It is to adaptively adjust the transmission performance, such as changing.

That is, in order to realize an ultra-low latency service in 5G, receiving an immediate and accurate response signal (Ack/Nack) would be the most important.

On the other hand, 5G is expected to adopt Dynamic TDD (Time Division Duplex) technology. The frame structure for data transmission and reception provided by the existing Dynamic TDD is for each subframe constituting the frame, in the case of DL, a DL data channel and Since the control channel is fixedly allocated and the UL data channel and control channel are fixedly allocated in the case of UL, the UL control channel is allocated to receive the response signal (Ack/Nack) for the DL data transmitted through the DL subframe. It must wait until the timing of the UL subframe.

That is, in the case of the existing dynamic TDD, it is impossible to receive an immediate response signal (Ack/Nack) for DL data transmitted through a DL subframe.

Therefore, in 5G, it is necessary to find a way to receive a response signal (Ack/Nack) more immediately.

Meanwhile, in 5G, in order to increase transmission efficiency between a base station and a terminal, multiple input multiple output (MIMO) technology based on beamforming technology capable of transmitting and receiving beamformed signals in different directions with multiple antennas will be adopted.

In the case of a communication system employing MIMO technology (hereinafter referred to as MIMO communication system), an optimal channel environment is best between antenna beams of various directions/types that can be formed by a base station and antenna beams of various directions/types that can be formed by a terminal. A beam pair is found, and communication is performed using the optimal beam pair.

However, terminals (users) can use communication services while moving at high speed while riding in a moving vehicle (eg train, car, etc.). In this case, in the MIMO communication system, as the channel environment between the base station and the terminal changes, the optimal Since the beam pair of is no longer valid, it may be impossible to receive a response signal (Ack/Nack) through it.

Therefore, in 5G, it is necessary to find a way to receive an accurate response signal (Ack/Nack) of a terminal in high-speed movement.

Therefore, in the present invention, to propose a new flexible TDD frame structure and a response signal reception (reply) method based on the new flexible TDD frame structure that enables immediate and accurate response signals (Ack/Nack) of a terminal moving at high speed in 5G do.

The present invention was created in view of the above circumstances, and the purpose to be reached in the present invention is a new flexible TDD frame that enables immediate and accurate response signals (Ack/Nack) of a terminal moving at high speed in 5G. It is to realize the structure and the response signal reception (reply) method based on it.

Method for configuring a subframe structure for data transmission according to a first aspect of the present invention for achieving the above object DMS, configuring a data channel through which downlink data is transmitted; and configuring an uplink control channel through which a response signal for downlink data transmitted through the data channel is transmitted, and configuring the number of uplink control channels to be different according to a predefined high-speed movement situation. do.

Preferably, the uplink control channel may be a physical uplink control channel (PUCCH) allocated to symbols after a symbol interval to which the data channel is allocated, among a plurality of symbols constituting a subframe.

Preferably, the number of uplink control channels may be greater in the high-speed movement situation than in the non-high-speed movement situation.

Preferably, whether or not the high-speed movement situation is determined based on a result of predicting whether or not at least one of a data transmitting end and a data receiving end is in a high-speed moving situation based on a reception success rate of a response signal for downlink data. .

In order to achieve the above object, a terminal device in a MIMO communication system according to a second aspect of the present invention includes a beam tracking performing unit for performing beam tracking for determining an optimal beam pair for data transmission with respect to a base station. ; In the beam tracking process, a confirmation unit for additionally checking at least one beam pair other than the optimal beam pair; and a response signal transmission unit for transmitting a response signal to data received using the optimum beam pair when a predefined high-speed movement situation occurs, using not only the optimum beam pair but also the at least one beam pair. include

Preferably, in the beam tracking process, the at least one beam pair may be sequentially identified according to an order in which a channel environment is excellent next to the optimum beam pair.

Preferably, the response signal transmission unit may transmit the response signal using both the optimal beam pair and the at least one beam pair based on a subframe of a high-speed movement structure preset in the high-speed movement situation. there is.

Preferably, in the subframe of the high-speed movement structure, a data channel through which downlink data is transmitted and an uplink control channel through which a response signal to downlink data transmitted through the data channel is transmitted are not in the high-speed movement situation. It can be included in a greater number of cases.

Preferably, the response signal transmission unit allocates the optimal beam pair and the at least one beam pair for each uplink control channel in a subframe of the high-speed movement structure, respectively, so that the optimal beam pair and the at least one beam pair are allocated. A response signal transmitted using each of the beam pairs of may be repeatedly transmitted through each uplink control channel within the subframe of the high-speed movement structure.

Preferably, the optimum beam pair is allocated to a first uplink control channel in the subframe of the high-speed movement structure, and among the at least one beam pair, a beam pair having the worst channel environment measured in the beam tracking process. may be allocated to the last uplink control channel in the subframe of the high-speed movement structure.

A base station apparatus in a MIMO communication system according to a third aspect of the present invention for achieving the above object includes: a beam tracking performer for performing beam tracking for determining an optimal beam pair for data transmission; In the beam tracking process, a confirmation unit for additionally checking at least one beam pair other than the optimal beam pair; and a retransmission control unit for transmitting data of a retransmission target according to the non-reception response by using all of the at least one beam pair as well as the optimal beam pair when a non-receipt response to the data transmitted to the terminal is returned. .

In order to achieve the above object, a response signal reply method performed by a terminal in a MIMO communication system according to a fourth aspect of the present invention, when performing beam tracking for determining an optimal beam pair for data transmission with respect to a base station, an identification limit for additionally verifying at least one beam pair in addition to the optimal beam pair; and a response signal transmission step of transmitting a response signal to data received using the optimum beam pair when a predefined high-speed movement situation occurs, using not only the optimum beam pair but also the at least one beam pair. includes

Preferably, in the step of transmitting the response signal, the response signal is transmitted using both the optimum beam pair and the at least one beam pair based on a subframe of a high-speed movement structure preset in the high-speed movement situation. can

Preferably, in the subframe of the high-speed movement structure, a data channel through which downlink data is transmitted and an uplink control channel through which a response signal to downlink data transmitted through the data channel is transmitted are not in the high-speed movement situation. It can be included in a greater number of cases.

Preferably, the response signal transmitting step allocates the optimal beam pair and the at least one beam pair for each uplink control channel within a subframe of the high-speed movement structure, respectively, so that the optimal beam pair and the at least one beam pair are allocated. A response signal transmitted using each beam pair may be repeatedly transmitted through each uplink control channel within the subframe of the high-speed movement structure.

In order to achieve the above object, a data retransmission method performed by a base station in a MIMO communication system according to a fifth aspect of the present invention, when performing beam tracking for determining an optimal beam pair for data transmission, for a terminal, the optimal beam pair A confirmation step of additionally verifying at least one beam pair other than the beam pair of; and a retransmission step of transmitting data to be retransmitted according to the non-reception response by using all of the at least one beam pair as well as the optimal beam pair when a non-receipt response to the data transmitted to the terminal is returned.

Therefore, according to the subframe structure configuration method, response signal reply method, terminal device, and base station device of the present invention, a new flexible, which enables to receive an accurate response signal (Ack/Nack) of a terminal that is instantaneous and moving at high speed in 5G By realizing a TDD frame structure and a response signal reception (reply) method based thereon, an effect of maximizing ultra-low-delay service performance is derived.

1 is an exemplary diagram showing a high-speed movement situation of a terminal in a MIMO communication system to which the present invention is applied.
2 is an exemplary diagram showing a flexible TDD frame structure proposed in the present invention.
3 is an exemplary view showing an example in which the flexible TDD frame structure proposed in the present invention is changed when a high-speed movement situation of a terminal occurs.
4 is a configuration diagram showing the configuration of a terminal device according to a preferred embodiment of the present invention.
5 is a configuration diagram showing the configuration of a base station device according to a preferred embodiment of the present invention.
6 is an exemplary view showing the flow of a response signal reply method according to a preferred embodiment of the present invention.
7 is an exemplary diagram showing the flow of a data retransmission method according to a preferred embodiment of the present invention.

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

The present invention is to propose a new flexible TDD frame structure suitable for a 5G mobile communication network environment oriented to Ultra Reliable & Low Latency Communication (URLLC) service.

Therefore, prior to explaining the present invention, a brief description of the frame structure provided by the existing dynamic TDD is as follows.

TDD is a technology that variably allocates and uses the same frequency radio resource to UL or DL according to time, and dynamic TDD is a technology that can adaptively respond to UL/DL traffic by adjusting an uplink/downlink ratio.

However, in the frame structure for data transmission and reception provided by the existing dynamic TDD, for each subframe constituting the frame, DL data channels and control channels are fixedly allocated in case of DL, and UL data channels and control channels are fixed in case of UL. It is an allocated structure.

That is, in the case of DL, a subframe according to the existing dynamic TDD has a structure in which a DL data channel (xPDSCH: Physical Downlink Shared Channel) and a control channel (xPDCCH: Physical Downlink Control Channel) are fixedly allocated.

In addition, in the case of UL, a subframe according to the existing dynamic TDD has a structure in which a UL data channel (xPUSCH: Physical Uplink Shared Channel) and a control channel (xPUCCH: Physical Uplink Control Channel) are fixedly allocated.

Therefore, in the existing dynamic TDD, as described above, the ratio of the DL subframe composed of the DL data channel (xPDSCH) and the control channel (xPDCCH) and the UL subframe composed of the UL data channel (xPUSCH) and the control channel (xPUCCH) is adjusted. In this way, it adaptively responds to UL/DL traffic.

Therefore, according to the existing dynamic TDD, in order to receive a response signal (Ack/Nack) for DL data transmitted through a DL subframe, it is necessary to wait until the time of the UL subframe to which the UL control channel is allocated.

That is, in the case of the existing dynamic TDD, it is impossible to receive an immediate response signal (Ack/Nack) for DL data transmitted through a DL subframe.

Therefore, taking the case of transmitting a large amount of DL data according to the existing dynamic TDD as an example, the UE transmits a response signal (Ack/Nack) for the received DL data to a UL subframe in which a UL control channel (xPUCCH) exists. Since a reply cannot be made until the time of transmission (t _a ), the actual transmission of DL data is from the time when DL data transmission starts to the time of receiving the response signal (Ack/Nack) for DL data (t _a ). It can be seen that it takes place after a period of time has elapsed.

As described above, in the case of the existing dynamic TDD, due to the structural limitations of the subframe, it may have been suitable for application to the 4th generation mobile communication network (LTE) environment, but when applied to 5G as it is, the ultra-low latency (URLLC) service can be provided as expected. It has limitations that are difficult to provide.

Therefore, in 5G, it is necessary to find a way to receive a response signal (Ack/Nack) more immediately.

Therefore, in the present invention, it is intended to propose a new flexible TDD frame structure suitable for 5G, which allows a response signal (Ack/Nack) to be received more immediately.

Meanwhile, in 5G, in order to increase transmission efficiency between a base station and a terminal, multiple input multiple output (MIMO) technology based on beamforming technology capable of transmitting and receiving beamformed signals in different directions with multiple antennas will be adopted.

In the case of a communication system employing MIMO technology (hereinafter referred to as MIMO communication system), an optimal channel environment is best between antenna beams of various directions/types that can be formed by a base station and antenna beams of various directions/types that can be formed by a terminal. A beam pair is found, and communication is performed using the optimal beam pair.

For example, as shown in FIG. 1, the base station 100 forms a plurality of antenna beams (#1, #2...) and the terminal 200 forms a plurality of antenna beams (UE#1, #2...). .), an optimal beam pair (eg: Beam tracking to find #2-UE#1) is performed, and the base station 100 and the terminal 200 communicate using the optimal beam pair (#2-UE#1) found through beam tracking. do.

Meanwhile, the terminal 200 may use a communication service while moving at high speed while riding a vehicle (eg, a train, a car, etc.) in operation.

In this case, in the MIMO communication system, the channel environment between the base station 100 and the terminal 200 changes, so that the optimal beam pair (#2-UE#1) found earlier is no longer valid, and beam tracking is re-performed to find the optimal beam pair. A situation in which a beam pair needs to be found again (hereinafter referred to as a beam switching situation) becomes a situation. In the case of FIG. 1 , when beam tracking is re-performed, #1-UE#2 will be found as an optimal beam pair.

However, in the beam switching situation, since the terminal 200 still returns the response signal (Ack/Nack) using the previous optimal beam pair (#2-UE#1) until beam tracking is re-performed, Reception of the response signal (Ack/Nack) may become impossible.

Therefore, in 5G, it is necessary to find a way to receive an accurate response signal (Ack/Nack) even for a terminal in high-speed movement.

Therefore, in the present invention, based on the flexible TDD frame structure proposed above, it is intended to propose a method for receiving (replying) a response signal that enables an accurate response signal (Ack/Nack) of a terminal in high-speed movement to be received.

Devices that realize (use) the new Flexible TDD frame structure of the present invention will be devices that use a mobile communication network-based communication service, most typically a base station 100 and a terminal 200 as shown in FIG. will be.

At this time, the base station 100 and the terminal 200 provide/use communication services with multiple antenna beams (MIMO), and in this case, data transmission through the flexible TDD frame structure of the present invention, which will be described later, is also mutually transmitted through multiple antenna beams. will transmit

However, when the base station 100 and the terminal 200 provide/use communication services with multiple antenna beams by adopting MIMO technology, the base station 100 transmits data to the terminal 200 and the terminal 200 ) transmits data to the base station 100 is defined in the same pattern.

Therefore, the new flexible TDD frame structure of the present invention can also be applied to DL, and in this case, the response signal (Ack/Nack) to be described later will be a UL signal from the terminal, and the new flexible TDD frame structure of the present invention can also be applied to UL. In this case, the response signal (Ack/Nack) to be described later will be a DL signal from the base station.

However, in 5G, as it is expected that large-capacity DL communication service will dominate, DL will be mainly mentioned and described below.

That is, according to the present invention, the base station 100 transmits DL data by realizing (using) the new flexible TDD frame structure of the present invention.

Hereinafter, the new flexible TDD frame structure of the present invention will be described in units of subframes.

A subframe according to the flexible TDD frame structure of the present invention is composed of a data channel through which downlink (DL) data is transmitted, and an uplink control channel through which a response signal for DL data transmitted through the data channel is transmitted.

In this case, the uplink control channel is preferably allocated to symbols after the symbol interval to which the data channel is allocated, among a plurality of symbols constituting the subframe.

In this way, in the flexible TDD frame structure of the present invention, a downlink channel and an uplink control channel are configured together in a subframe, but the uplink control channel is allocated to symbols after the symbol period to which the data channel is allocated, so that each constituting the frame Since data and response signals are transmitted and received in units of subframes (transmission time units of subframes), near real-time data transmission is performed, the performance of ultra-low latency (URLLC) services aimed at 5G can be improved.

Furthermore, the subframe according to the flexible TDD frame structure of the present invention has a feature of configuring the number of uplink control channels differently according to a predefined high-speed movement situation.

Hereinafter, the subframe according to the flexible TDD frame structure of the present invention will be described by dividing into a subframe of a high-speed movement structure configured in a high-speed movement situation and a subframe of a basic structure configured in a general situation other than high-speed movement.

Here, whether or not the high-speed movement situation is determined is based on the reception success rate of the response signal (Ack/Nack) for the DL data, at least one of the data transmitting end (e.g. base station) or data receiving end (e.g. terminal) is moving at high speed. It depends on the result of predicting whether or not the situation is. A description of this will be specifically mentioned again when a terminal device and a base station device are described later.

First, referring to FIG. 2, the subframe A of the basic structure is described. The subframe A includes a data channel through which DL data is transmitted, and a response signal (Ack) for DL data transmitted through the data channel. /Nack) is transmitted on the uplink control channel.

For example, a subframe consists of a plurality of symbols, for example, 14 ODFM symbols, and a data channel through which DL data is transmitted includes from the 2nd symbol (symbol 1) to the 12th symbol (symbol 11) among the 14 ODFM symbols. Assume assigned.

In this case, in the subframe (A), the uplink control channel is allocated to symbols after the symbol period (symbol 1 to symbol 11) to which the data channel is allocated among 14 ODFM symbols constituting the subframe.

In addition, as shown in FIG. 2, the subframe A of the basic structure may further configure a downlink control channel.

At this time, in the subframe (A), the downlink control channel is allocated to a symbol prior to the symbol period (symbol 1 to symbol 11) to which the data channel is allocated among 14 ODFM symbols constituting the subframe.

In summary, in the subframe (A) of the basic structure, among the 14 ODFM symbols constituting the subframe, the downlink control channel is allocated to the first symbol (symbol 0), and the twelfth from the second symbol (symbol 1) A data channel is allocated up to the symbol (symbol 11), a GP (Guard Period) for downlink/uplink change is allocated to the 13th symbol (symbol 12), and one uplink is allocated to the last 14th symbol (symbol 13). A control channel may be assigned.

More specifically, the subframe (A) of the basic structure according to the flexible TDD frame structure of the present invention includes an uplink control channel in the xPUCCH allocated to the last symbol 13 among 14 ODFM symbols constituting the subframe, and the first A downlink control channel is included in the xPDCCH allocated to symbol 0.

Therefore, in the present invention, the base station 100 configures a subframe (A) according to the flexible TDD frame structure of the present invention shown in FIG. Data can be transmitted to (200).

At this time, the base station 100 will transmit information on the structure of the subframe (A) to the terminal 200 through a separate System Information Block (SIB) or xPDCCH of each subframe (A).

Accordingly, the terminal 200 recognizing the received information, due to the structure in which the uplink control channel (xPUCCH) exists in each subframe (A) according to the flexible TDD frame structure of the present invention, each subframe (A) Since the response signal (Ack/Nack) for the DL data received through the xPDSCH of ) can be transmitted through the xPUCCH of the same subframe, the response signal in units of subframes can be transmitted. It can be seen that it is performed immediately in the transmission time unit of the frame.

In addition, in the case of DL transmission in a general case other than a high-speed movement situation in the present invention, the optimal beam pair (#2-UE#1) between the base station 100 and the terminal 200 is upstream in the subframe (A) of the basic structure The response signal (Ack/Nack) allocated to the link control channel (xPUCCH) and returned by the terminal 200 using the optimal beam pair (#2-UE#1) is the uplink control within the subframe (A). It will be received by the base station 100 through the channel (xPUCCH).

Meanwhile, referring to FIG. 2, the subframe B of the high-speed movement structure will be described as follows.

The subframe B of the high-speed movement structure is composed of a data channel through which DL data is transmitted and an uplink control channel through which a response signal (Ack/Nack) for the DL data transmitted through the data channel is transmitted. The uplink control channel is configured to have a larger number of subframes (A) than in the case of non-high-speed movement.

In addition, as shown in FIG. 2, the subframe B of the high-speed movement structure may further configure a downlink control channel.

For example, as described above, in the subframe A of the basic structure, the downlink control channel is allocated to the first symbol (symbol 0) among 14 ODFM symbols, and 12 from the second symbol (symbol 1) It is assumed that a data channel is allocated up to the th symbol (symbol 11), a GP is allocated to the 13th symbol (symbol 12), and one uplink control channel is allocated to the last 14th symbol (symbol 13).

In this case, in the subframe (B) of the high-speed movement structure, uplink control channels are allocated to symbols after the symbol period to which the data channel is allocated among the 14 ODFM symbols constituting the subframe, N more than one. do.

To this end, in the subframe B of the high-speed movement structure, it is desirable to reduce the symbol period allocated to the data channel through which DL data is transmitted.

For example, assuming that the number N of uplink control channels is 3 in the subframe B of the high-speed movement structure, the subframe B of the high-speed movement structure is the first symbol (symbol 0) among 14 ODFM symbols. ) is allocated a downlink control channel, data channels are allocated from the 2nd symbol (symbol 1) to the 10th symbol (symbol 9), GP is allocated to the 11th symbol (symbol 10), and the 12th symbol (symbol 9) is allocated. 11) to the last 14th symbol (symbol 13), a total of three uplink control channels can be allocated.

More specifically, the subframe (B) of the high-speed movement structure according to the flexible TDD frame structure of the present invention includes an uplink control channel in three xPUCCHs allocated in reverse order from the last symbol 13 among 14 ODFM symbols, and the first A downlink control channel is included in the xPDCCH allocated to symbol 0.

Therefore, in the present invention, the base station 100 configures a subframe B of a high-speed movement structure according to the flexible TDD frame structure of the present invention shown in FIG. 2 when transmitting DL in a high-speed movement situation, and based on this Data may be transmitted to the terminal 200 .

Also at this time, the base station 100 will deliver information on the subframe (B) structure to the terminal 200 through a separate SIB or xPDCCH of each subframe (B).

Accordingly, the terminal 200 recognizing the received information, due to the structure in which an uplink control channel (xPUCCH) exists in each subframe (B) according to the flexible TDD frame structure of the present invention, each subframe (B) Since the response signal (Ack/Nack) for the DL data received through the xPDSCH of ) can be transmitted through the xPUCCH of the same subframe, the response signal in units of subframes can be transmitted. It can be seen that it is performed immediately in the transmission time unit of the frame.

An important point here is that the subframe B of the high-speed movement structure has N uplink control channels (xPUCCHs).

In this case, in the subframe B of the high-speed movement structure, the base station 100 and the terminal 200 use the optimal beam pair (#2-UE#1) to return/receive the first response signal (Ack/Nack). Compared to the received subframe A, the response signal (Ack/Nack) can be repeatedly transmitted/received N times through N uplink control channels (xPUCCH) using N beam pairs.

Therefore, in the present invention, during DL transmission in the case of high-speed movement, response signals (Ack/Nack) for DL data are repeatedly replied/received N times using N beam pairs within a single subframe (B). , it is possible to increase the success rate of receiving a response signal by increasing the diversity effect experienced by the base station 100.

Hereinafter, with reference to the terminal device shown in FIG. 4, a configuration in which response signals are repeatedly received N times in a high-speed movement situation will be described in detail. Hereinafter, for convenience of description, reference numerals of the base station 100 and the terminal 200 shown in FIG. 1 will be used.

As shown in FIG. 4, the terminal apparatus 200 according to the present invention, with respect to the base station 100, performs beam tracking for determining an optimal beam pair for data transmission ( 210), and a confirmation unit 220 for additionally confirming at least one beam pair in addition to the optimal beam pair in the beam tracking process, and using the optimal beam pair when a predefined high-speed movement situation occurs and a response signal transmission unit 230 for transmitting a response signal for received data by using not only the optimal beam pair but also the at least one beam pair.

The beam tracking unit 210 performs beam tracking to determine an optimal beam pair for data transmission with respect to the base station 100 .

The terminal device 200 of the present invention is a terminal employing MIMO technology based on beamforming technology capable of transmitting and receiving beamformed signals in different directions by having multiple antennas.

Accordingly, the beam tracking unit 210, for the base station 100, which is an access node in the MIMO communication system, a plurality of antenna beams (#1, #2...) formed by the base station 100 and a terminal device ( 200) performs beam tracking to determine the optimal beam pair (e.g. #2-UE#1) having the best channel environment between the plurality of antenna beams (UE#1, #2...), periodically or perform whenever necessary.

Hereinafter, for convenience of explanation, it is assumed that #2-UE#1 is determined as an optimal beam pair.

The checker 220 additionally checks at least one beam pair in addition to the optimal beam pair (#2-UE#1) in the aforementioned beam tracking process.

Here, it is preferable that at least one beam pair is sequentially identified in the order of excellent channel conditions next to the optimum beam pair (#2-UE#1) in the above-described beam tracking process.

For example, the at least one beam pair is a second beam pair having the best channel environment next to the optimal beam pair (#2-UE#1), and a third beam pair having the next best channel environment, totaling two beam pairs. It may be a subordinated beam pair.

Hereinafter, a description will be given assuming that a total of two subordinated beam pairs (#3-UE#3 and #1-UE#2) are confirmed.

When a predefined high-speed movement situation occurs, the response signal transmission unit 230 transmits a response signal for data received using the optimal beam pair (#2-UE#1) to the optimal beam pair (#2-UE). In addition to #1), at least one beam pair additionally identified above, that is, two subordinated beam pairs (#3-UE#3 and #1-UE#2) are used for transmission.

Here, whether or not the high-speed movement situation occurs is determined by whether at least one of the data transmitting end (eg base station) or the data receiving end (eg terminal) is moving at high speed based on the reception success rate of the response signal (Ack/Nack) for the DL data. Depends on the result of predicting whether or not the situation is

More specifically, the base station 100 can monitor, for each terminal, a reception success rate of a response signal (Ack/Nack) that is returned (received) for DL data transmitted to the corresponding terminal.

Accordingly, the base station 100 determines whether at least one of the data transmitting end (eg base station) or the data receiving end (eg terminal) is moving at high speed based on the reception success rate of the response signal (Ack/Nack) being monitored. can predict whether

For example, based on the reception success rate of the response signal (Ack/Nack), if the reception success rate drops below the threshold or the reception success rate drops more than the threshold size compared to the previous time, it can be predicted as a high-speed movement situation. .

In the present invention, in addition to prediction based on the reception success rate of the response signal (Ack/Nack), any factor that can be used to predict whether or not it is a high-speed moving situation is monitored to predict whether it is a high-speed moving situation. There will be no restrictions on the method.

If the base station 100 predicts that the terminal device 200 is moving at high speed, it may notify the terminal device 200 that the high-speed moving situation occurs.

Meanwhile, a subject that predicts whether or not it is a high-speed moving situation in the above manner may be the base station 100 or the terminal device 200.

If the terminal device 200 is the subject, it will then notify the base station 100 that a high-speed movement situation occurs in relation to the terminal device 200 itself.

When the response signal transmission unit 230 recognizes that a high-speed movement situation occurs through notification from the base station 100 or prediction by itself, the response signal transmission unit 230 transmits information about DL data received using the optimal beam pair (#2-UE#1). For the response signal (Ack/Nack), not only the optimal beam pair (#2-UE#1) but also the two subordinated beam pairs (#3-UE#3 and #1-UE#2) additionally confirmed above send using

That is, the response signal transmitter 230 transmits the response signal (Ack/Nack) to the optimal beam pair (#2-UE#1) and It transmits using all two subordinated beam pairs (#3-UE#3, #1-UE#2).

More specifically, the response signal transmission unit 230 transmits an optimal beam pair (#2-UE#1) and two beam pairs (#2-UE#1) for each uplink control channel (xPUCCH) composed of N within the subframe (B) of the high-speed movement structure. Each of the lower priority beam pairs (#3-UE#3, #1-UE#2) is allocated.

At this time, the optimal beam pair (#2-UE#1) is preferably allocated to the first uplink control channel (xPUCCH) in the subframe (B) of the high-speed movement structure.

In addition, among the two additionally confirmed subordinated beam pairs (#3-UE#3, #1-UE#2), the beam pair with the worst measured channel environment in the beam tracking process, that is, the third-ranked beam pair (e.g. #3 -UE#3) is preferably allocated to the last uplink control channel (xPUCCH) in the subframe (B) of the high-speed movement structure.

That is, the optimal beam pair (#2-UE#1) and the two subordinated beam pairs (#3-UE#3, #1-UE#2) are used for N uplink control channels ( Among xPUCCHs, beam pairs are sequentially allocated in order of superior channel conditions in time order, starting with an uplink control channel (xPUCCH) transmitted first.

Hereinafter, for convenience of description, the optimal beam pair (#2-UE#1) and the second ranked beam pair (#1 -UE#2), it is assumed that the third rank beam pair (#3-UE#3) is sequentially allocated.

In this case, when recognizing that a high-speed movement situation has occurred, the response signal transmitter 230 uses an optimal beam pair (#2-UE#1) based on the subframe B of the high-speed movement structure to DL data is received through a data channel (xPDSCH) in frame (B), and a response signal (Ack/Nack) for this DL data is assigned to three uplink control channels (xPUCCH) in subframe (B), respectively. It is possible to transmit (reply) three times using three beam pairs (#2-UE#1, #1-UE#2, and #3-UE#3).

Therefore, referring to FIG. 3, the terminal device 100 of the present invention, in a general case other than a high-speed movement situation, based on the subframe A of the basic structure described above, the optimal beam pair (#2 -Using UE#1), it receives DL data and transmits (replies) a response signal (Ack/Nack) to the DL data.

Then, when the terminal device 100 of the present invention recognizes that a high-speed movement situation has occurred, based on the subframe B of the high-speed movement structure of the present invention described above, the optimal beam pair (#2-UE# 1) is used to receive DL data, and a response signal (Ack/Nack) for the DL data is repeatedly transmitted (received) N times using N beam pairs.

In this case, in a beam switching situation due to high-speed movement, the terminal device 200 transmits the response signal (Ack/Nack) to the optimum beam pair (#2-UE#1) as well as the subordinated beam pair before re-performing beam tracking is completed. Since the response is made using N beam pairs including N, the success rate of receiving a response signal from the base station 100 will increase.

Therefore, according to the present invention, by proposing (realizing) a new flexible TDD frame structure capable of transmitting data and response signals in units of subframes, it is possible to receive response signals (Ack/Nack) more immediately in 5G.

In addition, according to the present invention, based on the flexible TDD frame structure that changes according to the high-speed movement situation, response signals are received by overlapping response signals (Ack/Nack) with N beam pairs for a high-speed movement terminal. By increasing the success rate, it is possible to receive an accurate response signal (Ack/Nack) from a terminal moving at high speed in 5G.

Meanwhile, in the present invention, as described above, based on the flexible TDD frame structure that changes depending on whether or not the high-speed movement situation exists, a method for increasing the data retransmission success rate in a high-speed movement situation is also proposed.

More specifically, as shown in FIG. 5, the base station apparatus 100 according to a preferred embodiment of the present invention performs beam tracking for determining an optimal beam pair for data transmission for a terminal. When a non-receipt response to the data transmitted to the terminal is returned, and a retransmission control unit 130 for transmitting data of a retransmission target according to a non-received response by using not only the optimal beam pair but also the at least one beam pair.

Hereinafter, for convenience of description, reference numerals of the terminal 200 shown in FIG. 1 will be used.

The beam tracking unit 110 performs beam tracking to determine an optimal beam pair for data transmission for each terminal.

The base station device 100 of the present invention is a terminal employing MIMO technology based on beamforming technology capable of transmitting and receiving beamformed signals in different directions by having multiple antennas.

Accordingly, referring to the terminal 200, the beam tracking unit 110, for the terminal 200, which is a mobile node in the MIMO communication system, a plurality of antenna beams (#1) formed by the base station apparatus 100. ,#2...) and a plurality of antenna beams (UE#1,#2...) formed by the terminal 200, an optimal beam pair having the best channel environment (e.g., #2-UE#1) Beam tracking to determine is performed periodically or whenever necessary.

Hereinafter, for convenience of explanation, it is assumed that #2-UE#1 is determined as an optimal beam pair.

The checking unit 120 additionally checks at least one beam pair in addition to the optimal beam pair (#2-UE#1) in the aforementioned beam tracking process.

Here, it is preferable that at least one beam pair is sequentially identified in the order of excellent channel conditions next to the optimum beam pair (#2-UE#1) in the above-described beam tracking process.

For example, the at least one beam pair is a second beam pair having the best channel environment next to the optimal beam pair (#2-UE#1), and a third beam pair having the next best channel environment, totaling two beam pairs. It may be a subordinated beam pair.

Hereinafter, a description will be given assuming that a total of two subordinated beam pairs (#3-UE#3 and #1-UE#2) are confirmed.

When the non-received response (Nack) for the DL data transmitted to the terminal 200 is returned, the retransmission control unit 130 converts the DL data to be retransmitted according to the non-received response (Nack) into an optimal beam pair (#2-UE#). In addition to 1), at least one additionally confirmed beam pair, that is, two subordinated beam pairs (#3-UE#3, #1-UE#2) is used for transmission.

Referring to FIG. 3 in more detail, the base station apparatus 100 of the present invention, in a general case other than a high-speed movement situation, based on the subframe A of the basic structure described above, an optimal beam pair (# 2-UE#1) transmits DL data and receives a response signal (Ack/Nack) for the DL data.

At this time, since it is a general situation rather than a high-speed movement situation, the possibility that a non-received response (Nack) for DL data is returned from the terminal 200 is not very high.

Then, when the base station apparatus 100 of the present invention recognizes that a high-speed movement situation has occurred by notifying the terminal 200 or by predicting itself, the subframe of the high-speed movement structure of the present invention described above Based on (B), DL data is transmitted using beam pairs (#2-UE#1), and response signals (Ack/Nack) for DL data are repeatedly received three times using N beam pairs. .

At this time, since it is a high-speed movement situation, the possibility that a non-receipt response (Nack) for DL data is returned from the terminal 200 will increase rapidly compared to a general situation.

Accordingly, when the non-received response (Nack) for the DL data transmitted to the terminal 200 is returned, the retransmission control unit 130 transmits (retransmits) the DL data to be retransmitted according to the non-received response (Nack). Three beam pairs (#2-UE#1, #3-UE#3, #1-UE#), including two additionally confirmed subordinated beam pairs (#3-UE#3, #1-UE#2) 2) are all used.

For example, the retransmission control unit 130 transmits three beam pairs (#2-UE#1, #3-UE#3, and #1-UE#2) to the data within the subframe B of the high-speed movement structure. Distributed allocation can be made to the symbol intervals (symbols 1 to 9) to which the channel (xPDSCH) is allocated.

In this case, how to distribute and allocate N beam pairs to the symbol period of the data channel (xPDSCH) may vary depending on definition.

However, in the following description, for convenience of description, an optimal beam pair (#2-UE#1) and two subordinated beam pairs (#3-UE#3, #1-UE#2) are used for data channel (xPDSCH) It is assumed that beam pairs are sequentially allocated according to the order in which the channel environment is superior in time order from the symbol transmitted first among the symbol intervals of .

That is, in the symbol period (symbols 1 to 9) of the data channel (xPDSCH), in time order from the symbol transmitted first, #2-UE#1 -> #1-UE#2 -> #3-UE#3 - > #2-UE#1 -> #1-UE#2 -> #3-UE#3 ... is assigned.

Accordingly, when the non-receipt response (Nack) for the DL data transmitted to the terminal 200 is returned, the retransmission control unit 130 converts the DL data to be retransmitted according to the non-received response (Nack) into a subframe of the high-speed movement structure ( B) Using three beam pairs (#2-UE#1, #1-UE#2, #3-UE#3) distributed and allocated to the symbol period (symbols 1 to 9) of my data channel (xPDSCH) Duplicate transmission (retransmission).

In this case, since the terminal 200 repeatedly receives the previously unreceived DL data N times using N beam pairs within a single subframe (B), the data retransmission success rate is increased in a manner that increases the diversity effect can increase

Therefore, according to the present invention, based on the flexible TDD frame structure, by increasing the data retransmission success rate when data is retransmitted due to the response signal immediately received in units of subframes, it can contribute to maximizing ultra-low latency service performance in the end.

As described above, according to the present invention, a new flexible TDD frame structure and response signal reception (reply) based on the new flexible TDD frame structure that enables immediate and accurate response signals (Ack/Nack) of a terminal moving at high speed in 5G are received ) method, and furthermore, by realizing the data retransmission method, the effect of maximizing ultra-low latency service performance is derived.

Hereinafter, a response signal reply method (method) according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 6 .

For convenience of explanation, the terminal device 200 of FIG. 1 will be described as a device for performing the response signal reply method of the present invention.

The terminal device 200 performs beam tracking to determine an optimal beam pair for data transmission with respect to the base station 100 (S200).

For example, the terminal device 200, for the base station 100, which is an access node in the MIMO communication system, a plurality of antenna beams (#1, #2...) formed by the base station 100 and a terminal device ( 200) performs beam tracking to determine the optimal beam pair (e.g. #2-UE#1) having the best channel environment between the plurality of antenna beams (UE#1, #2...), periodically or perform whenever necessary.

Hereinafter, for convenience of explanation, it is assumed that #2-UE#1 is determined as an optimal beam pair.

At this time, in the response signal reply method performed by the terminal device 200, in the aforementioned beam tracking process, at least one additional beam pair other than the optimal beam pair (#2-UE#1) is additionally checked (S210).

Here, it is preferable that at least one beam pair is sequentially identified in the order of excellent channel conditions next to the optimum beam pair (#2-UE#1) in the above-described beam tracking process.

For example, the at least one beam pair is a second beam pair having the best channel environment next to the optimal beam pair (#2-UE#1), and a third beam pair having the next best channel environment, totaling two beam pairs. It may be a subordinated beam pair.

Hereinafter, a description will be given assuming that a total of two subordinated beam pairs (#3-UE#3 and #1-UE#2) are confirmed.

In a general case other than a high-speed movement situation, the terminal device 100 receives DL data using an optimal beam pair (#2-UE#1) based on the subframe A of the basic structure described above. and transmits (replies) a response signal (Ack/Nack) for the DL data (S220).

In the meantime, the response signal reply method performed by the terminal device 200, when the notification from the base station 100 or the fact that the high-speed movement situation has occurred by predicting itself (S230 Yes), the high-speed movement preset in the high-speed movement situation Based on the subframe (B) of the structure, the response signal (Ack / Nack) for the DL data received using the optimal beam pair (#2-UE#1), the optimal beam pair (#2-UE #1) as well as the two subordinated beam pairs (#3-UE#3, #1-UE#2) additionally confirmed above (S240, S250).

More specifically, the response signal reply method performed by the terminal device 200 is an optimal beam pair (#2-UE) for each uplink control channel (xPUCCH) composed of N within a subframe (B) of a high-speed movement structure. #1) and two subordinated beam pairs (#3-UE#3, #1-UE#2) are allocated respectively (S240).

At this time, the optimal beam pair (#2-UE#1) is preferably allocated to the first uplink control channel (xPUCCH) in the subframe (B) of the high-speed movement structure.

In addition, among the two additionally confirmed subordinated beam pairs (#3-UE#3, #1-UE#2), the beam pair with the worst measured channel environment in the beam tracking process, that is, the third-ranked beam pair (e.g. #3 -UE#3) is preferably allocated to the last uplink control channel (xPUCCH) in the subframe (B) of the high-speed movement structure.

That is, the optimal beam pair (#2-UE#1) and the two subordinated beam pairs (#3-UE#3, #1-UE#2) are used for N uplink control channels ( Among xPUCCHs, beam pairs are sequentially allocated in order of superior channel conditions in time order, starting with an uplink control channel (xPUCCH) transmitted first.

Hereinafter, for convenience of description, the optimal beam pair (#2-UE#1) and the second ranked beam pair (#1 -UE#2), it is assumed that the third rank beam pair (#3-UE#3) is sequentially allocated.

In this case, the response signal reply method performed by the terminal device 200 is based on the subframe (B) of the high-speed movement structure, using the optimal beam pair (#2-UE#1) to send the subframe (B) 3 beam pairs that receive DL data through my data channel (xPDSCH) and assign response signals (Ack/Nack) to the DL data to 3 uplink control channels (xPUCCH) in subframe (B). It is possible to transmit (reply) three times using (#2-UE#1, #1-UE#2, #3-UE#3) (S250).

In summary, the response signal reply method performed by the terminal device 200, when recognizing that a high-speed movement situation has occurred, based on the subframe B of the high-speed movement structure of the present invention described above, the optimal beam pair ( #2-UE#1) is used to receive DL data, and a response signal (Ack/Nack) for the DL data is repeatedly transmitted (received) N times using N beam pairs.

Hereinafter, a data retransmission method (method) according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 7 .

For convenience of description, the base station device 100 will be described as a device for performing the data retransmission method of the present invention.

The base station apparatus 100 performs beam tracking to determine an optimal beam pair for data transmission for each terminal (S100).

For example, referring to the terminal 200, the base station apparatus 100 has a plurality of antenna beams (#1, #) formed by the base station apparatus 100 for the terminal 200, which is a mobile node in a MIMO communication system. 2...) and a plurality of antenna beams (UE#1, #2...) formed by the terminal 200, determining an optimal beam pair (eg, #2-UE#1) having the best channel environment Beam tracking is performed periodically or whenever necessary.

Hereinafter, for convenience of explanation, it is assumed that #2-UE#1 is determined as an optimal beam pair.

At this time, in the data retransmission method performed by the base station apparatus 100, in the aforementioned beam tracking process, at least one beam pair other than the optimal beam pair (#2-UE#1) is additionally confirmed (S110).

Here, it is preferable that at least one beam pair is sequentially identified in the order of excellent channel conditions next to the optimum beam pair (#2-UE#1) in the above-described beam tracking process.

For example, the at least one beam pair is a second beam pair having the best channel environment next to the optimal beam pair (#2-UE#1), and a third beam pair having the next best channel environment, totaling two beam pairs. It may be a subordinated beam pair.

Hereinafter, a description will be given assuming that a total of two subordinated beam pairs (#3-UE#3 and #1-UE#2) are confirmed.

The base station apparatus 100 transmits DL data using an optimal beam pair (#2-UE#1) based on the subframe A of the basic structure described above in a general case other than a high-speed movement situation. and receives a response signal (Ack/Nack) for the DL data (S120).

At this time, since it is a general situation rather than a high-speed movement situation, the possibility that a non-received response (Nack) for DL data is returned from the terminal 200 is not very high.

In the meantime, when the base station apparatus 100 recognizes the fact that a high-speed movement situation has occurred by notifying the terminal 200 or by predicting itself to the terminal 200, the subframe (B) of the high-speed movement structure of the present invention described above ), DL data is transmitted using a beam pair (#2-UE#1), and a response signal (Ack/Nack) for DL data is repeatedly received three times using N beam pairs.

At this time, since it is a high-speed movement situation, the possibility that a non-receipt response (Nack) for DL data is returned from the terminal 200 will increase rapidly compared to a general situation.

Accordingly, in the data retransmission method performed by the base station apparatus 100, when the non-received response (Nack) for the DL data transmitted to the terminal 200 is returned (S130 Yes), the DL of the retransmission target according to the non-received response (Nack) When data is transmitted (retransmitted), three beam pairs (#2-UE#1, #3) including the two subordinated beam pairs (#3-UE#3, #1-UE#2) that were additionally checked earlier -UE#3, #1-UE#2) are all used (S140).

For example, in the data retransmission method performed by the base station apparatus 100, three beam pairs (#2-UE#1, #3-UE#3, and #1-UE#2) are used as subs of the high-speed movement structure. The data channel (xPDSCH) within the frame (B) can be distributed and allocated to symbol intervals (symbols 1 to 9) allocated.

In this case, how to distribute and allocate N beam pairs to the symbol period of the data channel (xPDSCH) may vary depending on definition.

However, in the following description, for convenience of description, an optimal beam pair (#2-UE#1) and two subordinated beam pairs (#3-UE#3, #1-UE#2) are used for data channel (xPDSCH) It is assumed that beam pairs are sequentially allocated according to the order in which the channel environment is superior in time order from the symbol transmitted first among the symbol intervals of .

That is, in the symbol period (symbols 1 to 9) of the data channel (xPDSCH), in time order from the symbol transmitted first, #2-UE#1 -> #1-UE#2 -> #3-UE#3 - > #2-UE#1 -> #1-UE#2 -> #3-UE#3 ... is assigned.

Accordingly, in the data retransmission method performed by the base station apparatus 100, when the non-received response (Nack) for the DL data transmitted to the terminal 200 is returned, the DL data of the retransmission target according to the non-received response (Nack) is transmitted at high speed. Three beam pairs (#2-UE#1, #1-UE#2, #3-UE) distributed and allocated to the symbol period (symbols 1 to 9) of the data channel (xPDSCH) in the subframe (B) of the mobile structure. Redundant transmission (retransmission) is done using #3).

As described above, according to the present invention of the present invention, a new flexible TDD frame structure and a response signal based on the new flexible TDD frame structure that enables immediate and accurate response signals (Ack/Nack) of a terminal moving at high speed in 5G By realizing a reception (reply) method and furthermore, a data retransmission method, an effect of maximizing ultra-low latency service performance is derived.

A response signal reply method and data retransmission method according to an embodiment of the present invention may be implemented in the form of program commands that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the medium may be those specially designed and configured for the present invention or those known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler. The hardware devices described above may be configured to act as one or more software modules to perform the operations of the present invention, and vice versa.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above embodiments, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the following claims. Anyone skilled in the art will extend the technical spirit of the present invention to the extent that various variations or modifications are possible.

According to the present invention, in that it proposes (realizes) a new method suitable for 5G of ultra-low-delay service, which enables immediate and accurate response signals (Ack/Nack) of a mobile terminal in high-speed movement, it overcomes the limitations of the existing technology. According to the jump, not only the use of the related technology, but also the possibility of marketing or business of the applied device is sufficient, and it is an invention with industrial applicability because it can be clearly implemented in reality.

100: base station device
200: terminal device
210: beam tracking unit 220: confirmation unit
230: response signal transmission unit

Claims (16)

A method for constructing a subframe structure for data transmission, performed by a device using a communication service,
configuring a data channel through which downlink data is transmitted; and
Configuring an uplink control channel through which a response signal to downlink data transmitted through the data channel is transmitted, and configuring the number of uplink control channels differently according to a predefined high-speed movement situation A method of constructing a subframe structure, characterized in that. According to claim 1,
The uplink control channel,
Among a plurality of symbols constituting the subframe, the data channel is a physical uplink control channel (PUCCH) allocated to symbols after the allocated symbol period. According to claim 1,
The number of uplink control channels is
A subframe structure construction method characterized in that more in the high-speed movement situation than in the case of not the high-speed movement situation. According to claim 1,
Whether or not the high-speed movement situation,
A subframe structure construction method according to a result of predicting whether at least one of a data transmitter and a data receiver is in a high-speed movement situation based on a reception success rate of a response signal for downlink data. In a terminal device in a MIMO communication system,
With respect to the base station, a beam tracking performer for performing beam tracking (tracking) for determining an optimal beam pair for data transmission;
In the beam tracking process, a confirmation unit for additionally checking at least one beam pair other than the optimal beam pair; and
Includes a response signal transmitter for transmitting a response signal to data received using the optimal beam pair when a predefined high-speed movement situation occurs, using all of the at least one beam pair as well as the optimal beam pair A terminal device characterized in that to do. According to claim 5,
The at least one beam pair,
In the beam tracking process, the terminal device, characterized in that sequentially confirmed according to the order of excellent channel conditions next to the optimal beam pair. According to claim 5,
The response signal transmission unit,
The terminal device characterized in that for transmitting the response signal using both the optimum beam pair and the at least one beam pair based on a subframe of a high-speed movement structure preset in the high-speed movement situation. According to claim 7,
The subframe of the high-speed movement structure,
The terminal device characterized in that it includes a data channel through which downlink data is transmitted and an uplink control channel through which a response signal to the downlink data transmitted through the data channel is transmitted in a greater number than in the case of non-high-speed movement. . According to claim 7,
The response signal transmission unit,
Allocating the optimal beam pair and the at least one beam pair for each uplink control channel in the subframe of the high-speed movement structure,
The terminal device characterized in that the response signal transmitted using each of the optimal beam pair and the at least one beam pair is duplicately transmitted through each uplink control channel in the subframe of the high-speed movement structure. According to claim 9,
The optimal beam pair is allocated to a first uplink control channel in a subframe of the high-speed movement structure;
A terminal device according to claim 1 , wherein a beam pair having the worst measured channel environment in the beam tracking process among the at least one beam pair is allocated to a last uplink control channel in a subframe of the high-speed movement structure. In the base station device in the MIMO communication system,
A beam tracking performer for performing beam tracking to determine an optimal beam pair for data transmission with respect to the terminal;
In the beam tracking process, a confirmation unit for additionally checking at least one beam pair other than the optimal beam pair; and
A retransmission control unit for transmitting data of a retransmission target according to a non-received response returned from the terminal by using all of the at least one beam pair as well as the optimal beam pair when recognizing the occurrence of a predefined high-speed movement situation for the terminal. A base station device comprising a. In the response signal reply method performed by the terminal in the MIMO communication system,
For the base station, when performing beam tracking for determining an optimal beam pair for data transmission, a confirmation limit for additionally checking at least one beam pair other than the optimal beam pair; and
When a predefined high-speed movement situation occurs, a response signal transmission step of transmitting a response signal for data received using the optimal beam pair using all of the at least one beam pair as well as the optimal beam pair Response signal reply method characterized in that it comprises. According to claim 12,
In the step of transmitting the response signal,
and transmitting the response signal using both the optimal beam pair and the at least one beam pair based on a subframe of a high-speed movement structure preset in the high-speed movement situation. According to claim 13,
The subframe of the high-speed movement structure,
A response signal characterized in that a data channel through which downlink data is transmitted and an uplink control channel through which a response signal to downlink data transmitted through the data channel is transmitted are transmitted in a greater number than when the high-speed movement situation is not present. How to reply. According to claim 13,
In the step of transmitting the response signal,
Allocating the optimal beam pair and the at least one beam pair for each uplink control channel in the subframe of the high-speed movement structure,
A response signal reply method characterized in that the response signal transmitted using each of the optimal beam pair and the at least one beam pair is repeatedly transmitted through each uplink control channel in the subframe of the high-speed movement structure. . In a data retransmission method performed by a base station in a MIMO communication system,
A confirmation step of additionally checking at least one beam pair other than the optimal beam pair when performing beam tracking for determining an optimal beam pair for data transmission in a terminal; and
A retransmission step of transmitting data of a retransmission target according to an unreceived response returned from the terminal using all of the at least one beam pair as well as the optimal beam pair when recognizing the occurrence of a predefined high-speed movement situation for the terminal. Data retransmission method comprising a.

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