KR20180039472A - Data transmitting apparatus and method, subframe structure configuration method - Google Patents

Abstract

According to the present invention, disclosed is a technology for supporting the high speed low latency performance in a 5G environment by realizing a new flexible TDD frame structure suitable for an upcoming 5G, in other words, a mobile communication network environment to support high speed low latency communication. A subframe structure configuration method of the present invention comprises the steps of: configuring a data channel through which downlink or uplink data are transmitted; and configuring an uplink control channel for a response signal on downlink data transmitted through a data channel of a current subframe and a downlink control channel for a response signal on uplink data transmitted through a data channel of a previous subframe.

Description

TECHNICAL FIELD [0001] The present invention relates to a data transmission apparatus and a data transmission method, and a sub-frame structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for transmitting data between devices, and more particularly, to a data transmission technique suitable for a mobile communication network environment of a high-speed low-delay service which will appear in the future.

A mobile communication network environment supporting Ultra Low Reliability & Low Latency Communication (URLLC) based on close data transmission / reception in real time in accordance with the development of a mobile communication network for mass data / high speed transmission, (Hereinafter referred to as 5G) environment.

On the other hand, in the current communication system, TDD (Time Division Duplex) is used in which the same frequency radio resource is allocated to UL or DL variably over time and adapt to UL / DL traffic by adjusting the uplink / It is a tendency to adopt Dynamic TDD capable of coping with the situation.

However, the frame structure for data transmission and reception provided in the conventional dynamic TDD is such that a downlink data channel and a control channel are fixedly allocated in the downlink and an uplink data channel and a control channel are allocated in the sub- And a control channel is fixedly allocated.

Therefore, in the case of the conventional dynamic TDD, although it may be suitable for the 4th generation mobile communication network (LTE) environment, if it is applied to the 5G environment, it is difficult to support the high speed low delay (URLLC) as expected.

Accordingly, the present invention proposes a new flexible TDD frame structure suitable for a mobile communication network environment to support 5G, i.e., high speed low latency (URLLC) communication.

The present invention has been made in view of the above circumstances, and an object of the present invention is to realize a flexible TDD frame structure suitable for a mobile communication network (5G) environment for supporting high-speed low-delay communication.

According to a first aspect of the present invention, there is provided a method of configuring a subframe structure for data transmission and reception, the method comprising: configuring a data channel through which downlink or uplink data is transmitted; And an uplink control channel for a response signal for downlink data transmitted through the data channel of this subframe and a downlink control channel for a response signal for uplink data transmitted through the data channel of the immediately preceding subframe .

Preferably, the uplink control channel is allocated to a symbol after a symbol interval allocated to the data channel among a plurality of symbols constituting a subframe, and the downlink control channel includes a plurality of The data channel may be allocated to a symbol before a symbol interval allocated to the data channel.

Preferably, the uplink control channel is included in a physical uplink control channel (PUCCH) allocated to a last symbol among a plurality of symbols constituting a subframe, and the downlink control channel includes a plurality of May be included in a Physical Downlink Control Channel (PDCCH) allocated to the first symbol among the symbols.

Preferably, a data transmission apparatus in a wireless communication system for transmitting and receiving data according to a second aspect of the present invention for achieving the above object is characterized in that, in a plurality of transmission modes, a transmission mode mapped to a type of data traffic to be transmitted A transmission mode confirmation unit for confirming the transmission mode; And a data transmission unit for transmitting the data traffic using a subframe of a structure according to the determined transmission mode.

Preferably, the data transmission unit transmits a response signal for downlink data transmitted through the data channel of the current subframe, a data channel for transmitting downlink or uplink data when the transmission mode is the low-delay transmission mode, And a downlink control channel for a response signal to the uplink data transmitted through the data channel of the immediately preceding subframe, Signals can be transmitted and received.

Preferably, the data transmission unit is a unit of a group consisting of two or more subframes when the transmission mode is a downlink or uplink fast transmission mode, and all the subframes in the group are data for downlink or uplink data transmission Channel, and the last sub-frame in the group includes an uplink control channel for a response signal to downlink data transmitted through the data channel of this group, and only the first sub-frame in the sub-frame group includes data of the immediately preceding group A data and a response signal can be transmitted and received in units of subframe groups using a subframe of a high-speed transmission structure including a downlink control channel for a response signal to uplink data transmitted through a channel.

Preferably, the subframe between the first subframe and the last subframe in the group may be a structure including only a data channel for downlink or uplink data transmission.

Preferably, the data transmitting unit may determine whether or not to use the transmission mode mapped to the data traffic type according to at least one of a usage ratio for each transmission mode and a usage order for each transmission mode when data traffic is generated It can be judged.

Preferably, at least one of the usage rate for each transmission mode and the usage order for each transmission mode may be updated every predetermined period in relation to a transmission time of a single frame composed of a plurality of subframes.

According to a third aspect of the present invention, there is provided a data transmission method performed by a base station or a terminal according to the third aspect of the present invention, comprising the steps of: determining a transmission mode for confirming a transmission mode mapped to a type of data traffic to be transmitted step; And a data transmission step of transmitting the data traffic using a subframe of a structure according to the confirmed transmission mode.

Preferably, the data transmission step includes a data channel in which downlink or uplink data is transmitted when the transmission mode is the low-delay transmission mode, a response signal for downlink data transmitted through the data channel in the current subframe, And a downlink control channel for a response signal to the uplink data transmitted through the data channel of the immediately preceding subframe, and a downlink control channel for a response signal to the uplink data transmitted through the data channel of the immediately preceding subframe. Response signals can be transmitted and received.

Preferably, when the transmission mode is the downlink or uplink fast transmission mode, the data transmission step may be performed in a group consisting of two or more subframes, wherein all the subframes in the group are for downlink or uplink data transmission Data channel, and only the last sub-frame in the group includes an uplink control channel for a response signal to downlink data transmitted through the data channel of this group, and only the first sub-frame in the sub-frame group includes Data and response signals can be transmitted and received in units of subframe groups using a subframe of a high-speed transmission structure including a downlink control channel for a response signal to uplink data transmitted through a data channel.

Preferably, the subframe between the first subframe and the last subframe in the group may be a structure including only a data channel for downlink or uplink data transmission.

Preferably, when the data traffic is generated, the data traffic is mapped to the data traffic type according to at least one of the usage ratios set for the respective transmission modes and the predefined usage order for each transmission mode, And determining whether the transmission mode is available or not.

Accordingly, according to the data transmission apparatus, the data transmission method, and the subframe structure configuration method of the present invention, a flexible TDD frame structure suitable for a mobile communication network environment for supporting communication of 5G, that is, Based on this, a fluid (sub) frame structure is operated to maximize the high-speed low-delay performance.

1 is an exemplary diagram illustrating a frame structure provided by a conventional Dynamic TDD.
2 is an exemplary diagram showing a communication system to which the present invention is applied.
3 is a block diagram illustrating a configuration of a data transmission apparatus according to a preferred embodiment of the present invention.
FIGS. 4 and 5 illustrate examples in which a high-speed low-delay performance is achieved based on the flexible TDD frame structure proposed in the present invention.
FIG. 6 is a flowchart showing a flow of data transmission using a flexible (sub) frame structure in a data transmission 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 proposes a new flexible TDD frame structure suitable for a mobile communication network environment to support 5G, Ultra Reliable & Low Latency Communication (URLLC) communication.

Prior to detailed description of the present invention, the frame structure provided by the conventional Dynamic TDD will be described with reference to FIG.

TDD is a technique in which the same frequency radio resource is allocated to UL or DL in accordance with time, and Dynamic TDD is a technology capable of adapting adaptively to UL / DL traffic by adjusting the uplink / downlink ratio.

However, the frame structure for data transmission and reception provided in the conventional dynamic TDD is such that a downlink data channel and a control channel are fixedly allocated in the downlink and an uplink data channel and a control channel are allocated in the sub- And a control channel is fixedly allocated.

That is, as shown in FIG. 1, a subframe according to a conventional Dynamic TDD is configured such that a downlink data channel (xPDSCH) and a physical downlink control channel (xPDCCH) . In addition, a subframe according to the conventional dynamic TDD has a structure in which a physical uplink data channel (xPUSCH) and a physical uplink control channel (xPUCCH) are fixedly allocated in the uplink.

Therefore, in the conventional Dynamic TDD, uplink subframes composed of the downlink data channel (xPDSCH) and the control channel (xPDCCH), the uplink data channel (xPUSCH) and the control channel (xPUCCH) And adaptively responds to UL / DL traffic.

As shown in FIG. 1, when a large amount of downlink data is transmitted according to the conventional dynamic TDD, the ratio of the downlink subframes is increased and the downlink subframes # 1, # 2, # 3. .

At this time, since the terminal can not transmit a response signal of ACK / NACK for the downlink data until the uplink time (t _a) that is the sub-frame is transmitted to the uplink control channel (xPUCCH) exist, the downlink data The actual transmission of the downlink subframe # 1 can be considered to be performed after the time from the time when the downlink subframe # 1 starts to be transmitted until the time point t _a at which the response signal for the downlink data is transmitted.

Likewise, as shown in FIG. 1, when a large amount of uplink data is transmitted according to the conventional dynamic TDD, the uplink subframes # 1, # 2, # 3. .

At this time, since the base station can not transmit a response signal of ACK / NACK for the uplink data until the downlink sub-frame in which the downlink control channel (xPDCCH) is transmitted becomes t _b , the actual transfer can be seen and done after the time to the uplink sub-frames # 1 is the time (t _b) to start transmitting a response signal for the uplink data from the time it is sent.

As described above, the conventional dynamic TDD may be suitable for the 4th generation mobile communication network (LTE) environment due to the structural limit of the subframe. However, if applied to the 5G environment, the high speed low delay (URLLC) Which is difficult to support.

Accordingly, the present invention proposes a new flexible TDD frame structure suitable for a mobile communication network environment to support 5G, i.e., high speed low latency (URLLC) communication.

Therefore, a device (i.e., a data transmission device) that realizes (utilizes) a new flexible TDD frame structure of the present invention will be a device that uses a communication service based on a mobile communication network and most typically includes a base station 100 as shown in FIG. And the terminal 10.

At this time, the base station 100 and the terminal 10 may provide / use a communication service using a single antenna beam (SISO, Single Input Single Output). In this case, the data transmission through the flexible TDD frame structure of the present invention Lt; RTI ID = 0.0 > beam < / RTI >

Of course, the base station 100 and the terminal 10 may provide / utilize a multi-antenna beam communication service (MIMO). In this case, data transmission through the flexible TDD frame structure of the present invention, They will transfer each other.

However, MIMO technology will be adopted in the high-speed and low-delay mobile communication network, ie, 5G environment, which will be developed in the future, in accordance with the trend of development for mass data / high-speed transmission.

However, when the base station 100 and the terminal 10 employ a MIMO technique and the base station 100 and the terminal 10 provide / use communication services using a plurality of antenna beams (e.g., dual antenna beams), the base station 100 transmits data to the terminal 10 The downlink transmission and the uplink transmission, in which the terminal 10 transmits data to the base station 100, are defined in the same pattern.

Therefore, the data transmission apparatus of the present invention may be the base station 100 or the terminal 10. [

That is, the base station 100 as the data transmission apparatus of the present invention realizes (utilizes) a new flexible TDD frame structure of the present invention to transmit downlink data at the time of downlink transmission.

On the other hand, the terminal 10 as the data transmission apparatus of the present invention realizes (uses) a new flexible TDD frame structure of the present invention at the time of uplink transmission and transmits the uplink data.

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

A subframe according to the new flexible TDD frame structure of the present invention includes a data channel through which downlink or uplink data is transmitted and an uplink control channel for a response signal to downlink data transmitted through the data channel of this subframe And a downlink control channel for a response signal to the uplink data transmitted on the data channel of the immediately preceding subframe.

At this time, the sub-frame structure shown in FIG. 4 is a structure for improving the high-speed low-delay (URLLC) performance, and will be referred to as a low-delay transmission structure.

In a subframe of such a low-delay transmission structure, the uplink control channel is preferably allocated to a symbol after a symbol interval in which a data channel is allocated among a plurality of symbols constituting a subframe.

For example, the subframe is composed of a plurality of symbols, for example, 14 ODFM symbols, and the data channel to which the downlink data is transmitted includes the 2 nd symbol (symbol 1) to the 12th symbol (symbol 11) And the data channel through which the uplink data is transmitted is allocated from the third symbol (symbol 2) to the thirteenth symbol (symbol 12) among the 14 ODFM symbols.

In this case, in the subframe of the low-delay transmission structure, the uplink control channel is allocated to the subframe after the symbol interval (symbol 1 to symbol 11 and / or symbol 2 to symbol 12) allocated to the data channel among the 14 ODFM symbols constituting the subframe Lt; / RTI >

Also, in the sub-frame of the low-delay transmission structure, the downlink control channel is transmitted before the symbol interval (symbol 1 to symbol 11 and / or symbol 2 to symbol 12) allocated to the data channel among the 14 ODFM symbols constituting the subframe Lt; / RTI >

4, the reason why the symbol interval in which the data channel is allocated is from symbol 1 to symbol 11 in the case of the downlink and from symbol 2 to symbol 12 in the case of the uplink is that the reason for the downlink / (Guard Period).

Therefore, in the sub-frame of the low-delay transmission structure, the uplink control channel is allocated to the last symbol 13 among the 14 ODFM symbols constituting the subframe, and the downlink control channel is allocated to the first It is preferable to be allocated to symbol 0.

More specifically, as shown in FIG. 4, in the low-delay subframe according to the new flexible TDD frame structure of the present invention, in the downlink / uplink, among the 14 ODFM symbols constituting the subframe, The downlink channel may be included in the xPDCCH allocated to the first symbol 0, and the downlink channel may be included in the uplink control channel.

And, the low-delay subframe includes a data channel (xPDSCH or xPUSCH) to be downlinked or uplinked and an unillustrated GP between xPDCCH and xPUCCH.

Accordingly, the base station 100 as a data transmission apparatus of the present invention constructs a low-delay downlink subframe according to the flexible TDD frame structure of the present invention shown in FIG. 4 during downlink transmission, # 1, # 2, # 3 ... to the terminal 10.

At this time, the base station 100 transmits the information on the subframe structure or the transmission mode (the information on the transmission mode) through the xPDCCH of the separate SIB (System Information Block) or the low-delay downlink subframes # 1, # 2, A low delay transmission scheme or a low delay transmission mode) to the terminal 10.

Therefore, the terminal 10 recognizing the received information (low-delay transmission structure or low-delay transmission mode) transmits the uplink control information to the low-delay downlink subframes # 1, # 2, # 3, The ACK / NACK response signal for each downlink data transmitted through the xPDSCH of the low-delay downlink subframes # 1, # 2, # 3,... Due to the structure in which the channel (xPUCCH) (T _d1 , t _d2 , t _d3, ...), the actual transmission of the downlink data is performed in units of transmission time of each subframe .

In the uplink transmission, the terminal 10 as the data transmission apparatus of the present invention generates the same data in the same pattern based on the information (low-delay transmission structure or low-delay transmission mode) previously received from the base station 10 It is possible to construct a low-delay uplink subframe according to the flexible TDD frame structure of the present invention, and to transmit data to the base station 100 using the low-delay uplink subframe.

At this time, due to the structure in which the downlink control channel (xPDCCH) exists in each of the low-delay uplink subframes # 1, # 2, # 3 of the present invention, The response signal of the ACK / NACK for each uplink data transmitted through the xPUSCH of # 1, # 2, # 3 ... is transmitted through the xPDCCH of the next subframe, (T _u1 , t _u2 ...), the actual transmission of the uplink data can be regarded as a transmission time unit of each sub-frame.

As described above, since the flexible TDD frame structure proposed in the present invention configures downlink / uplink control channels (PDCCH, PUCCH) in a single subframe during downlink / uplink data transmission, Data and response signals are transmitted / received in units of sub-frames (transmission time unit of the sub-frame), and data transmission close to real time is performed, so that the performance of high speed low delay (URLLC)

On the other hand, in the foregoing description, the flexible TDD frame structure proposed in the present invention is described as a structure (low-delay transmission structure) in which data and response signals in units of subframes are transmitted in real time through transmission and reception.

The flexible TDD frame structure proposed in the present invention is intended to satisfy the high speed low delay (URLLC) performance in 5G through other structures other than the low delay transmission structure, and the other proposed structure will be referred to as a fast transmission structure.

The basic structure of the subframe of the fast transmission structure according to the flexible TDD frame structure of the present invention is such that the transmission of a response signal of ACK / NACK is minimized and a high-speed data transmission is performed when a large amount of downlink or uplink data is transmitted.

A subframe of a high-speed transmission structure according to the new flexible TDD frame structure of the present invention is a group consisting of two or more subframes, wherein all subframes in the group include a data channel for downlink or uplink data transmission, Only the last sub-frame includes an uplink control channel for a response signal to the downlink data transmitted through the data channel of this group, and only the first sub-frame in the sub-frame group is transmitted through the data channel of the immediately preceding group And a downlink control channel for a response signal to the link data.

5 shows subframes (downlink fast subframes) of a downlink fast transmission structure for downlink fast transmission and subframes (uplink fast subframes) of an uplink fast transmission structure for uplink fast transmission .

5, only the first sub-frame # 1 in the sub-frame group # 1 is grouped into the immediately preceding group (for example, the sub-frame # And a downlink control channel (xPDCCH) for a response signal to the uplink data transmitted on the data channel (xPUSCH) of the base station (group # 0).

That is, if the subframe is composed of 14 ODFM symbols, only the first subframe # 1 in the subframe group # 1 includes the downlink control channel in the xPDCCH allocated to the first symbol 0.

Of course, the data channel (xPDSCH) is allocated to the remaining symbols of the first subframe # 1, that is, the second symbol 1 to the last symbol 13.

Only the last subframe #N in the subframe group # 1 contains an uplink control channel (xPUSCH) for a response signal to the downlink data transmitted on the data channel (xPDSCH) of this subframe group # 1 .

That is, if the subframe is composed of 14 ODFM symbols, only the last subframe #N in the subframe group # 1 includes the uplink control channel in the xPUSCH allocated to the last symbol 13.

Of course, a data channel (xPDSCH) is allocated to the first symbol 0 to symbol 11 of the last subframe #N. Although not shown in FIG. 5, the symbol 12 of the last subframe #N has a GP for downlink / Will be assigned.

In the subframes # 2, # 3 ... # N-1 between the first and last subframes in the subframe group # 1, only the data channel (xPDSCH) is allocated to all 14 ODFM symbols.

On the other hand, in the case of the uplink, only the first sub-frame # 1 in the sub-frame group # 2 in the group (sub-frame group # 2) And a downlink control channel (xPDCCH) for a response signal to the uplink data transmitted on the data channel (xPUSCH) of subframe group # 1.

That is, if the subframe is composed of 14 ODFM symbols, only the first subframe # 1 in the subframe group # 2 includes the downlink control channel in the xPDCCH allocated to the first symbol 0.

5, a GP for downlink / uplink change is allocated to a second symbol 1 of a first subframe # 1, and a data channel (xPUSCH) is allocated to remaining symbols, that is, a third symbol 2 to a last symbol 13, .

Only the last subframe #M in the subframe group # 2 includes the uplink control channel (xPUSCH).

That is, if the subframe is composed of 14 ODFM symbols, only the last subframe #M in the subframe group # 1 includes the uplink control channel in the xPUSCH allocated to the last symbol 13.

Of course, the data channel (xPUSCH) will be allocated to the first symbol 0 to the symbol 12 of the last subframe #M.

In the subframes # 2, # 3 ... # M-1 between the first and last subframes in the subframe group # 1, only the data channel (xPUSCH) is allocated to all 14 ODFM symbols.

Accordingly, when a large amount of downlink transmission is performed, the base station 100 as the data transmission apparatus of the present invention transmits downlink high-speed subframes 1, # 2, and # 3 according to the flexible TDD frame structure of the present invention shown in FIG. A group of subframes grouped into. # N can be configured, and a large amount of data can be transmitted to the terminal 10 using the subframe group.

At this time, the base station 100 will transmit information on the subframe structure or the transmission mode (downlink fast transmission structure or downlink fast transmission mode) to the terminal 10 through the separate SIB or xPDCCH of the subframe group .

The terminal 10 recognizing the received information (the low-delay transmission structure or the low-delay transmission mode) transmits the sub-frame grouped by the downlink fast sub-frames 1, # 2, # 3 ... # Due to the structure in which only one uplink control channel (xPUSCH) exists in the group, a response signal of ACK / NACK for all downlink data transmitted through the xPDSCH in the subframe group is transmitted through a single xPUCCH in the same subframe group (T _d11 ...), The actual transmission of the downlink data can be regarded as a transmission time unit of each subframe group.

The terminal 10 as the data transmission apparatus of the present invention is capable of transmitting uplink high-speed subframes # 1, # 2, and # 3 according to the flexible TDD frame structure of the present invention shown in FIG. A group of subframes grouped by # M can be configured, and a large amount of data can be transmitted to the base station 100 using the subframe group.

To this end, the base station 100 transmits information on the subframe structure or the transmission mode (the uplink fast transmission structure or the uplink fast transmission mode) to the terminal 10 via the separate SIB or the xPDCCH of the subframe group, The process of ensuring that

At this time, due to the structure in which there is only one downlink control channel (xPDCCH) in the subframe group grouped into the uplink fast subframes 1, # 2, # 3 ... #M of the present invention, because it can transmit a response signal of a sub-frame group basis in such a manner as to transmit a response signal of ACK / NACK from a single xPDCCH within the next sub-frame group for all the uplink data transmitted over the xPUSCH of the sub-frame group (t _U11 ...), the actual transmission of the uplink data can be regarded as being made in units of transmission time of each subframe group.

As described above, in the flexible TDD frame structure proposed in the present invention, a downlink / uplink control channel (PDCCH, PUCCH) is formed on a per subframe group basis for a large amount of downlink / uplink data transmission, The data and the acknowledgment signal are transmitted / received in units of subframe group transmission time). Therefore, compared to the above-described low-delay transmission structure, the real-time performance may be somewhat lowered. However, by minimizing the ACK / NACK response signal transmission, It is possible to improve the high-speed low-delay (URLLC) performance directed by 5G.

In the foregoing, the flexible TDD frame structure proposed in the present invention, that is, the low delay transmission structure, the downlink and the uplink high-speed transmission structure has been described.

Hereinafter, a data transmission apparatus for transmitting data using the flexible TDD frame structure of the present invention will be described in detail with reference to FIG.

As described above, the data transmission apparatus of the present invention may be the base station 100 or the terminal 10. [ However, for convenience of explanation, reference numerals of the base station 100 will be described.

3, the data transmission apparatus 100 of the present invention includes a transmission mode checking unit 110 for checking a transmission mode mapped to a type of data traffic to be transmitted among a plurality of transmission modes, And a data transmission unit 120 for transmitting the data traffic using a subframe according to a transmission mode.

Here, the plurality of transmission modes refers to a low-delay transmission mode, a downlink high-speed transmission mode, and an uplink high-speed transmission mode.

The transmission mode checking unit 110 identifies a transmission mode mapped to a type of data traffic to be transmitted among a plurality of transmission modes, that is, a low-delay transmission mode / a downlink fast transmission mode / an uplink fast transmission mode.

More specifically, the transmission mode checking unit 110 identifies the type of data traffic to be transmitted to the terminal 10, and determines which transmission mode among the transmission modes that are previously mapped by type To check if it is applicable.

At this time, it is possible to use various existing identification methods such as a data traffic identification method for existing QoS control, and to design / use a new data traffic identification method in addition to the method of identifying the type of data traffic will be.

The mapping of the transmission mode for each type of data traffic can be designed / changed in advance.

However, in the present invention, the type of data traffic is classified into type 1 requiring real-time performance, type 2 requiring downlink high-speed transmission, and type 3 requiring high-speed uplink transmission. It is assumed that the type 2-downlink fast transmission mode and the type 3-uplink fast transmission mode are mapped.

Accordingly, the transmission mode checking unit 110 identifies which type of data traffic to transmit to the terminal 10 is of the types 1, 2, and 3, and confirms the transmission mode to which the data traffic type is mapped will be.

The data transmission unit 120 transmits data traffic using a subframe having a structure according to the confirmed transmission mode.

For example, if the transmission mode to which the type of data traffic is mapped is a low-delay transmission mode, the data transmission unit 120 may transmit a data channel (xPDSCH or xPUSCH) to which downlink or uplink data is transmitted, An uplink control channel (xPUCCH) for a response signal to downlink data transmitted through a data channel of a frame, a downlink control channel (xPDCCH) for a response signal for uplink data transmitted through a data channel of a previous subframe, And transmits and receives data and response signals on a subframe-by-subframe basis.

That is, the data transmitter 120 constructs a low-delay downlink subframe according to the flexible TDD frame structure of the present invention shown in FIG. 4 according to the determined low-delay transmission mode, and the low-delay downlink subframe # 1 , # 2, # 3 ... to the terminal 10.

At this time, the data transmission unit 120 transmits the sub-frame structure or the transmission mode for the sub-frame structure or the transmission mode through the xPDCCH of the separate SIB (System Information Block) or the low-delay downlink subframes # 1, # 2, Information (low-delay transmission scheme or low-delay transmission mode) to the terminal 10. [

Therefore, the terminal 10 recognizing the received information (low-delay transmission structure or low-delay transmission mode) transmits the uplink control information to the low-delay downlink subframes # 1, # 2, # 3, The ACK / NACK response signal for each downlink data transmitted through the xPDSCH of the low-delay downlink subframes # 1, # 2, # 3,... Due to the structure in which the channel (xPUCCH) (T _d1 , t _d2 , t _d3, ...), the actual transmission of the downlink data is performed in units of transmission time of each subframe .

If the data transmission apparatus of the present invention is the terminal 10, the transmission mode confirmation unit (not shown) in the terminal 10 transmits the information (low-delay transmission structure or low-delay transmission mode) previously received from the base station 10, The low-delay transmission mode is confirmed.

The data transmission unit (not shown) in the UE 10 transmits the low delay uplink subframes # 1, # 2, and # 3 according to the flexible TDD frame structure of the present invention shown in FIG. 4, # 3 ..., and can transmit data to the base station 100 using the generated data.

At this time, due to the structure in which the downlink control channel (xPDCCH) exists in each of the low-delay uplink subframes # 1, # 2, # 3 of the present invention, The response signal of the ACK / NACK for each uplink data transmitted through the xPUSCH of # 1, # 2, # 3 ... is transmitted through the xPDCCH of the next subframe, (T _u1 , t _u2 ...), the actual transmission of the uplink data can be regarded as a transmission time unit of each sub-frame.

Meanwhile, if the transmission mode to which the data traffic type is mapped is a downlink or uplink high-speed transmission mode, the data transmission unit 120 may be configured such that all the subframes in the group are down (XPDSCH or xPUSCH) for a link or an uplink data transmission, and only the last sub-frame in the group includes an uplink control channel (xPUCCH) for a response signal to downlink data transmitted on the data channel of this group, And a downlink control channel (xPDCCH) for a response signal for uplink data transmitted through the data channel of the immediately preceding group to a first subframe in a subframe group, , And transmits and receives data and response signals in units of subframe groups.

That is, when the downlink fast transmission mode is confirmed, the data transmission unit 120 transmits the downlink fast subframes 1 and # 2 according to the flexible TDD frame structure of the present invention shown in FIG. 5 according to the downlink fast transmission mode , # 3 ... # N, and can transmit a large amount of data to the terminal 10 using the subframe group.

At this time, the data transmission unit 120 transmits information on the subframe structure or the transmission mode (downlink fast transmission structure or downlink fast transmission mode) to the terminal 10 via the separate SIB or xPDCCH of the subframe group Will deliver.

The terminal 10 recognizing the received information (the downlink fast transmission structure or the downlink fast transmission mode) groups the downlink fast subframes 1, # 2, # 3 ... # N of the present invention Due to the structure in which only one uplink control channel (xPUSCH) exists in the subframe group, a response signal of ACK / NACK for all downlink data transmitted through the xPDSCH of the subframe group is transmitted as a single xPUCCH in the same subframe group (T _d11 ...), The actual transmission of the downlink data can be regarded as a transmission time unit of each subframe group.

Meanwhile, when the uplink fast transmission mode is confirmed, the data transmission unit 120 transmits information on the subframe structure or the transmission mode (uplink fast transmission structure or uplink high speed transmission scheme or uplink fast transmission scheme) through a separate SIB or xPDCCH of the subframe group Transmission mode) to the terminal 10. [

The transmission mode confirmation unit (not shown) in the terminal 10 as the data transmission apparatus of the present invention is configured to transmit the uplink high-speed data Check the transfer mode.

The data transmission unit (not shown) in the terminal 10 transmits the uplink fast subframes # 1, # 2, and # 3 according to the flexible TDD frame structure of the present invention shown in FIG. 5, # 3 ... # M, and can transmit a large amount of data to the base station 100 using the group.

At this time, due to the structure in which there is only one downlink control channel (xPDCCH) in the subframe group grouped into the uplink fast subframes 1, # 2, # 3 ... #M of the present invention, because it can transmit a response signal of a sub-frame group basis in such a manner as to transmit a response signal of ACK / NACK from a single xPDCCH within the next sub-frame group for all the uplink data transmitted over the xPUSCH of the sub-frame group (t _U11 ...), the actual transmission of the uplink data can be regarded as being made in units of transmission time of each subframe group.

On the other hand, since the base station 100 transmits and receives data to and from a plurality of terminals and the entire radio resources for data transmission and reception are limited, the transmission mode (low delay / downlink fast / uplink fast transmission mode) It is necessary to use it in a balanced manner.

To this end, it is preferable that the data transmission apparatus 100 of the present invention periodically updates and manages at least one of a usage rate for each transmission mode and a usage order for each transmission mode.

Here, the use ratio of each transmission mode, that is, the usage ratio of each of the low-delay / downlink fast / uplink fast transmission modes may be set to, for example, A, B, C (A + B + C = 100).

The use order set for each transmission mode is a condition for restricting use instead of using the corresponding transmission mode unconditionally even if there is data traffic mapped to the corresponding transmission mode.

For example, to describe the low-delay transmission mode, if the data traffic mapped to the low-delay transmission mode is confirmed, if the low-delay transmission mode is used when confirming the data traffic previously mapped to the low-delay transmission mode, (A = 40) is less than a certain value (for example, less than half) unless the low-delay transmission mode is used in the case of checking the data traffic mapped to the low-delay transmission mode in advance , The low-delay transmission mode can be unconditionally used, and in the case of using more than a specific value (for example, majority), it can be variously set as the use order 2 according to the use order 1.

Of course, the downlink high-speed transmission mode and the uplink high-speed transmission mode can also be set in various usage orders as described above.

At this time, the data transmission apparatus 100 is configured to transmit, based on the large data accumulated cumulatively, the types of data traffic (types of transmission modes) provided to a plurality of terminals in each time slot, It is desirable to update the usage rate for each transmission mode and the usage order for each transmission mode so that a high-speed low-delay service can be provided to many terminals.

The update period is preferably a predetermined period in relation to the transmission time of a single frame composed of a plurality of subframes.

For example, assuming that a single frame consists of 50 sub-frames with a transmission time of 0.2 ms, the transmission time of a single frame will be 10 ms.

In this case, the updating period may be preset to L * 10 ms (L is set to be variable).

The data transmission unit 120 determines whether or not to use the transmission mode mapped to the type of the data traffic currently occurring according to at least one of the usage ratios for each transmission mode and the order of use for each transmission mode .

For example, when new data traffic mapped to the low-delay transmission mode is generated, the data transmission unit 120 may use the low-delay transmission mode unconditionally, instead of using the periodically updated transmission rate per transmission mode, (Low-delay / downlink high-speed / uplink high-speed transmission mode) by judging whether or not to use the low-delay transmission mode according to the transmission mode.

Of course, the case of generating the data traffic mapped to the downlink fast transmission mode and the uplink fast transmission mode will also be the same.

As described above, the data transmission apparatus of the present invention can be applied to a new flexible TDD frame structure (low-delay / downlink high-speed up / down) suitable for a 5G environment, Link high-speed), the effect of supporting high-speed low-delay performance in a 5G environment is derived.

In addition, the data transmission apparatus of the present invention flexibly operates transmission modes (subframe structures) of a flexible TDD frame structure (low delay / downlink high speed / uplink high speed) in consideration of limited radio resources, The effect of maximizing the delay performance is derived.

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

For convenience of explanation, the base station 100 will be described to correspond to the above description as a data transmission apparatus.

The data transmission method of the base station 100 according to the present invention is a method for updating (by setting) the usage ratio for each transmission mode and the order of use for each transmission mode for every predetermined period (e.g., L * 10 ms) (S100).

At this time, the data transmission method of the base station 100 according to the present invention is based on the large data that accumulates and accumulates the type (transmission mode type) of data traffic provided to a plurality of terminals in each time slot, , It is desirable to update the usage ratios for each transmission mode and the order of use for each transmission mode so that a high-speed low-latency service can be provided to as many terminals as possible in limited radio resources.

The data transmission method of the base station 100 according to the present invention is characterized in that when data traffic for transmission to a terminal, for example, the terminal 10 is generated (S110), a plurality of transmission modes, / Transmission mode that is mapped to the type of data traffic in the uplink high-speed transmission mode (S120).

Hereinafter, the type of data traffic is classified into type 1 requiring real-time performance, type 2 requiring downlink high-speed transmission, and type 3 requiring high-speed uplink transmission. The downlink fast transmission mode, and the type 3-uplink fast transmission mode.

The data transmission method of the base station 100 according to the present invention identifies which type of data traffic to transmit to the terminal 10 is of the types 1, 2, and 3, and when the type of the data traffic is mapped Check the transmission mode.

The data transmission method of the base station 100 according to the present invention may be configured such that the transmission mode confirmed in step S120 is not used unconditionally but the transmission mode determined in step S100 according to the transmission rate- Is used (S130).

If the data transmission method of the base station 100 according to the present invention determines that the currently determined transmission mode is used as a result of the determination in step S130 (Yes in step S130), the data transmission method of the base station 100 transmits data traffic (S140).

For example, if the transmission mode determined in step S120 and used in step S130 is the low-delay transmission mode, the data transmission method of the base station 100 according to the present invention may include the steps of It is possible to construct a low delay downlink subframe according to the flexible TDD frame structure of the present invention and to transmit data to the terminal 10 using the low delay downlink subframes # 1, # 2, # 3, (S140).

At this time, the data transmission method of the base station 100 according to the present invention is a method of transmitting data in a sub-frame structure or a transmission mode through an xPDCCH of a separate SIB or low-delay downlink subframe # 1, # 2, (Low-delay transmission scheme or low-delay transmission mode) to the terminal 10 and inform the terminal 10 of the information.

Therefore, the terminal 10 recognizing the received information (low-delay transmission structure or low-delay transmission mode) transmits the uplink control information to the low-delay downlink subframes # 1, # 2, # 3, The ACK / NACK response signal for each downlink data transmitted through the xPDSCH of the low-delay downlink subframes # 1, # 2, # 3,... Due to the structure in which the channel (xPUCCH) (T _d1 , t _d2 , t _d3, ...), the actual transmission of the downlink data is performed in units of transmission time of each subframe .

If the data transmission apparatus of the present invention is the terminal 10, the terminal 10 can confirm the low delay transmission mode based on the information previously received from the base station 10 (low delay transmission structure or low delay transmission mode) Accordingly, low delay uplink subframes # 1, # 2, # 3,... According to the flexible TDD frame structure of the present invention shown in FIG. 4 are configured according to the confirmed low delay transmission mode, 100) (S150).

In the data transmission method of the base station 100 according to the present invention, if the transmission mode determined in step S120 and used in step S130 is the downlink fast transmission mode, # 2, # 3 ... # N according to the flexible TDD frame structure of the present invention shown in FIG. 3B, and uses a large amount of data (S140).

In this case, the data transmission method of the base station 100 according to the present invention transmits information (sub-frame structure or transmission mode information (downlink fast transmission structure or downlink fast transmission mode) through a separate SIB or xPDCCH of a subframe group, To the terminal (10) and informs the terminal (10).

The terminal 10 recognizing the received information (the downlink fast transmission structure or the downlink fast transmission mode) groups the downlink fast subframes 1, # 2, # 3 ... # N of the present invention Due to the structure in which only one uplink control channel (xPUSCH) exists in the subframe group, a response signal of ACK / NACK for all downlink data transmitted through the xPDSCH of the subframe group is transmitted as a single xPUCCH in the same subframe group (T _d11 ...), The actual transmission of the downlink data can be regarded as a transmission time unit of each subframe group.

Meanwhile, in the data transmission method of the base station 100 according to the present invention, if the transmission mode determined in step S120 and used in step S130 is the downlink fast transmission mode, a separate SIB or an xPDCCH of a subframe group (High-speed uplink transmission structure or uplink high-speed transmission mode) for the subframe structure or transmission mode to the terminal 10 (S140).

The data transmission method of the terminal 10 according to the present invention checks the uplink fast transmission mode based on the information (the uplink fast transmission structure or the uplink fast transmission mode) transmitted from the base station 10, According to the transmission mode, subframe groups grouped into uplink high-speed subframes # 1, # 2, # 3 ... #M according to the flexible TDD frame structure of the present invention shown in FIG. 5 are formed, A large amount of data can be transmitted to the base station 100 (S150).

Meanwhile, if it is determined in step S130 that the currently determined transmission mode is not used (No in step S130), the data transmission method of the base station 100 according to the present invention transmits the data using the sub- To the terminal 10 (S160).

As described above, the data transmission method of the present invention can be applied to a new flexible TDD frame structure (low-delay / downlink high-speed up / down) suitable for a 5G environment, Link high-speed), the effect of supporting high-speed low-delay performance in a 5G environment is derived.

In addition, the data transmission method of the present invention flexibly operates transmission modes (subframe structures) of a flexible TDD frame structure (low delay / downlink fast / uplink high speed) in consideration of limited radio resources, The effect of maximizing the delay performance is derived.

The data transfer method according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media 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 machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the data transmission apparatus and the data transmission method according to the present invention, a new flexible TDD frame structure suitable for the 5G environment of the high-speed low-delay service is proposed. Therefore, It is not only the possibility of commercialization or operation of the applicable device but also the possibility of being practically and practically possible, it is an invention that is industrially applicable.

10: terminal (data transmission apparatus)
100: Base station (data transmission apparatus)
110: Transmission mode checking unit 120: Data transmission unit

Claims (14)

A method of configuring a subframe structure for data transmission / reception,
Configuring a data channel over which downlink or uplink data is transmitted; And
An uplink control channel for a response signal to downlink data transmitted through a data channel of this subframe and a downlink control channel for a response signal to uplink data transmitted through a data channel of a previous subframe Wherein the sub-frame structure comprises a plurality of sub-frames. The method according to claim 1,
The uplink control channel is allocated to a symbol after a symbol interval allocated to the data channel among a plurality of symbols constituting a subframe,
Wherein the downlink control channel is allocated to a symbol before a symbol interval allocated to the data channel among a plurality of symbols constituting a subframe. The method according to claim 1,
The uplink control channel is included in a Physical Uplink Control Channel (PUCCH) allocated to a last symbol among a plurality of symbols constituting a subframe,
Wherein the downlink control channel is included in a Physical Downlink Control Channel (PDCCH) allocated to a first symbol among a plurality of symbols constituting a subframe. A data transmission apparatus in a wireless communication system for transmitting and receiving data,
A transmission mode checking unit for checking a transmission mode mapped to a type of data traffic to be transmitted among a plurality of transmission modes; And
And a data transmission unit for transmitting the data traffic using a subframe having a structure according to the determined transmission mode. 5. The method of claim 4,
Wherein the data transfer unit comprises:
When the transmission mode is the low-delay transmission mode,
A data channel on which downlink or uplink data is transmitted, an uplink control channel for a response signal to downlink data transmitted on the data channel of this subframe, an uplink control channel for uplink data transmitted on the data channel of the immediately preceding subframe And transmits and receives data and response signals in units of subframes using a subframe of a low-delay transmission structure including a downlink control channel for a response signal for each subframe. 5. The method of claim 4,
Wherein the data transfer unit comprises:
If the transmission mode is a downlink or uplink fast transmission mode,
All of the subframes in the group include a data channel for downlink or uplink data transmission and only the last subframe in the group includes downlink data transmitted through the data channel of this group And a downlink control channel for a response signal to the uplink data transmitted on the data channel of the immediately preceding group only in the first subframe in the subframe group, And transmits and receives data and response signals in units of subframe groups by using the subframe of the subframe. The method according to claim 6,
The sub-frame between the first sub-frame and the last sub-
Wherein the data transmission channel is a structure including only a data channel for downlink or uplink data transmission. 5. The method of claim 4,
Wherein the data transfer unit comprises:
And determines whether or not the transmission mode mapped to the type of the data traffic is used according to at least one of a usage ratio for each transmission mode and a usage order for each transmission mode when data traffic is generated. . 9. The method of claim 8,
At least one of the use ratio for each transmission mode and the order of use for each transmission mode,
Wherein the data is updated every predetermined period in relation to a transmission time of a single frame composed of a plurality of sub-frames. A data transmission method performed by a base station or a terminal in a wireless communication system for transmitting and receiving data,
A transmission mode checking step of checking a transmission mode mapped to a type of data traffic to be transmitted among a plurality of transmission modes; And
And a data transmission step of transmitting the data traffic using a subframe of a structure according to the determined transmission mode. 11. The method of claim 10,
The data transfer step comprises:
When the transmission mode is the low-delay transmission mode,
A data channel on which downlink or uplink data is transmitted, an uplink control channel for a response signal to downlink data transmitted on the data channel of this subframe, an uplink control channel for uplink data transmitted on the data channel of the immediately preceding subframe And transmitting and receiving data and response signals on a subframe-by-subframe basis using a subframe of a low-delay transmission structure including a downlink control channel for an acknowledgment signal. 11. The method of claim 10,
The data transfer step comprises:
If the transmission mode is a downlink or uplink fast transmission mode,
All of the subframes in the group include a data channel for downlink or uplink data transmission and only the last subframe in the group includes downlink data transmitted through the data channel of this group And a downlink control channel for a response signal to the uplink data transmitted on the data channel of the immediately preceding group only in the first subframe in the subframe group, And transmits and receives data and response signals in units of subframe groups using the subframe of the subframe. 13. The method of claim 12,
The sub-frame between the first sub-frame and the last sub-
Wherein the data is a structure including only a data channel for downlink or uplink data transmission. 11. The method of claim 10,
The method of claim 1, further comprising the steps of: determining, when a data traffic occurs, a transmission mode mapped to a type of the data traffic according to at least one of a usage ratio for each transmission mode and a pre- Further comprising the step of determining whether to use the data.

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