KR102099083B1 - Data transmitting apparatus and method, subframe structure configuration method - Google Patents

Abstract

The present invention discloses a technology supporting high-speed low-latency performance in a 5G environment by realizing a new flexible TDD frame structure suitable for a mobile communication network environment for supporting 5G, that is, high-speed, low-latency communication, which will appear in the future.

Description

Data transmission device, data transmission method, and subframe structure configuration method {DATA TRANSMITTING APPARATUS AND METHOD, SUBFRAME STRUCTURE CONFIGURATION METHOD}

The present invention relates to a technology for transmitting data between devices, and more particularly, to a data transmission technology suitable for a mobile communication network environment of a high-speed low-latency service that will appear in the future.

With the development of a mobile communication network for high-capacity data / high-speed transmission, a mobile communication network environment supporting high-speed low-delay (URLLC: Ultra Reliable & Low Latency Communication) communication based on near real-time data transmission and reception, for example, a 5G mobile communication network (Hereinafter, 5G) It will develop into the environment.

On the other hand, the current communication system adopts a time division duplex (TDD) that allocates and uses the same frequency radio resources to UL or DL according to time, and adapts to UL / DL traffic by adjusting the uplink / downlink ratio. It is a trend to adopt Dynamic TDD, which is capable of responding to enemies.

However, 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 downlink, the downlink data channel and the control channel are fixedly allocated, and in the case of uplink, the uplink data channel and It is a structure in which the control channel is fixedly allocated.

Therefore, in the case of the existing Dynamic TDD, it may have been suitable for application to a 4G mobile communication network (LTE) environment, but when applied to the 5G environment as it is, it has a limitation that it is difficult to support high-speed low-latency (URLLC) as expected.

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

The present invention was created 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-latency communication.

A method of configuring a subframe structure for data transmission and reception according to the first aspect of the present invention for achieving the above object comprises: 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 the subframe and a downlink control channel for a response signal for uplink data transmitted through the data channel of the previous subframe. It includes the steps.

Preferably, the uplink control channel is assigned to a symbol after a symbol interval to which the data channel is allocated, among a plurality of symbols constituting a subframe, and the downlink control channel comprises a plurality of subframes. Among the symbols, the data channel may be allocated to a symbol before a symbol period to which it is allocated.

Preferably, the uplink control channel is included in a physical uplink control channel (PUCCH) allocated to the last symbol among a plurality of symbols constituting a subframe, and the downlink control channel comprises a plurality of subframes. It may be included in a physical downlink control channel (PDCCH) allocated to the first symbol among symbols.

Preferably, a data transmission apparatus in a wireless communication system that transmits and receives data according to a second aspect of the present invention for achieving the above object is a transmission mode mapped to a type of data traffic to be transmitted among a plurality of transmission modes. Transmission mode check unit for checking; And a data transmission unit transmitting the data traffic using a subframe having a structure according to the identified transmission mode.

Preferably, when the transmission mode is a low-latency transmission mode, the data transmission unit transmits a response signal for downlink data transmitted through a data channel through which a downlink or uplink data is transmitted or a data channel of the current subframe. Data and response in units of subframes by using a subframe of a low-latency transmission structure including a downlink control channel for a response signal for an uplink data transmitted through an uplink control channel for the uplink data and a previous subframe data channel. Send and receive signals.

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

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 occurs, according to at least one of a preset use rate for each transmission mode and a usage order for each transmission mode, whether or not to use the transmission mode mapped to the type of the data traffic is determined. I can judge.

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

A data transmission method performed by a base station or a terminal according to a third aspect of the present invention for achieving the above object, among a plurality of transmission modes, confirms a transmission mode that identifies 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 having a structure according to the identified transmission mode.

Preferably, in the data transmission step, when the transmission mode is a low-latency transmission mode, a response signal for downlink data transmitted through a data channel through which a downlink or uplink data is transmitted or a data channel of this subframe. By using a subframe of a low-latency transmission structure including an uplink control channel for, a downlink control channel for a response signal to the uplink data transmitted through the data channel of the immediately preceding subframe, data and data in units of subframes Response signals can be transmitted and received.

Preferably, in the data transmission step, when the transmission mode is a downlink or uplink high-speed transmission mode, in a group unit composed of two or more subframes, all subframes in the group are used for downlink or uplink data transmission. It includes a data channel, and only the last subframe in the group includes an uplink control channel for a response signal to downlink data transmitted through this group's data channel, and only the first subframe in the subframe group of the immediately preceding group By using a subframe of a high-speed transmission structure including a downlink control channel for a response signal for uplink data transmitted through a data channel, data and a response signal can be transmitted and received in units of subframe groups.

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 data traffic occurs, it is mapped to the type of the data traffic according to at least one of a preset use rate for each transmission mode and a preset use order for each transmission mode in all radio resources for data transmission and reception. The method may further include determining whether to use the transmission mode.

Accordingly, according to the data transmission apparatus, data transmission method, and subframe structure configuration method of the present invention, a flexible TDD frame structure suitable for a mobile communication network environment to support 5G, that is, high-speed, low-latency communication will be realized in the future, Based on this, the effect of maximizing high-speed low-latency performance is derived by operating a flexible (sub) frame structure.

1 is an exemplary view showing a frame structure provided by the existing Dynamic TDD.
2 is an exemplary view showing a communication system to which the present invention is applied.
3 is a block diagram showing the configuration of a data transmission device according to a preferred embodiment of the present invention.
4 and 5 are exemplary views showing a case in which high-speed low-latency performance is achieved based on the flexible TDD frame structure proposed in the present invention.
6 is a flowchart illustrating a flow of transmitting data 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 is to propose a new flexible TDD frame structure suitable for a mobile communication network environment to support 5G, that is, high-speed low-latency (URLLC: Ultra Reliable & Low Latency Communication) communication.

Accordingly, prior to a detailed description of the present invention, a frame structure provided by the existing Dynamic TDD will be described with reference to FIG. 1.

TDD is a technique in which the same frequency radio resources are variably allocated to UL or DL according to time, and Dynamic TDD is a technique capable of adaptively responding to UL / DL traffic by adjusting the uplink / downlink ratio.

However, 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 downlink, the downlink data channel and the control channel are fixedly allocated, and in the case of uplink, the uplink data channel and It is a structure in which the control channel is fixedly allocated.

That is, as shown in FIG. 1, in the case of a downlink according to the existing dynamic TDD, a downlink data channel (xPDSCH: Physical Downlink Shared Channel) and a control channel (xPDCCH: Physical Downlink Control Channel) are fixedly allocated. It has a structure. In addition, the subframe according to the existing dynamic TDD has a structure in which an uplink data channel (xPUSCH: Physical Uplink Shared Channel) and a control channel (xPUCCH: Physical Uplink Control Channel) are fixedly allocated in the case of uplink.

Therefore, in the conventional Dynamic TDD, as described above, the downlink subframe composed of the downlink data channel (xPDSCH) and the control channel (xPDCCH), the uplink subframe composed of the uplink data channel (xPUSCH) and the control channel (xPUCCH). By adjusting the ratio of the, it is adaptively responding to UL / DL traffic.

Thus, as shown in FIG. 1, when transmitting a large amount of downlink data according to the existing Dynamic TDD, the ratio of the downlink subframe is increased, and the downlink subframes # 1, # 2, # 3 .. Will send.

At this time, since the terminal cannot transmit a response signal of ACK / NACK to the downlink data until the time t _{a of} when the uplink subframe in which the uplink control channel (xPUCCH) exists is transmitted, the downlink data It can be considered that the actual transmission of is made after the time from the time when the downlink subframe # 1 starts to be transmitted to the time (t _a ) when the response signal for the downlink data is transmitted.

Similarly, as shown in FIG. 1, when transmitting a large amount of uplink data according to the existing Dynamic TDD, the ratio of the uplink subframe is increased to increase the uplink subframes # 1, # 2, and # 3. Will send ..

At this time, since the base station cannot transmit a response signal of ACK / NACK to the uplink data until the time (t _b ) when the downlink subframe in which the downlink control channel (xPDCCH) exists is transmitted, the uplink data It can be considered that the actual transmission of is made after the time from the time when the uplink subframes # 1 start to be transmitted to the time (t _b ) when the response signal for the uplink data is transmitted.

As described above, in the case of the existing Dynamic TDD, due to the structural limitation of the subframe, it may have been suitable for application in the 4G mobile communication network (LTE) environment, but when applied to the 5G environment as it is, high-speed low-latency (URLLC) is expected. It has limitations that are difficult to apply.

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

Therefore, a device for realizing (using) the new flexible TDD frame structure of the present invention, that is, a data transmission device, will be a device using a communication service based on a mobile communication network, and most typically, the base station 100 as shown in FIG. 2. And terminal 10.

At this time, the base station 100 and the terminal 10 may provide / use a communication service with a single antenna beam (SISO, Single Input Single Output), and in this case, data transmission through the flexible TDD frame structure of the present invention, which will be described later. It will transmit each other through a single antenna beam.

Of course, the base station 100 and the terminal 10 may also 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 to be described later also via multiple antenna beams. Will transfer to each other.

However, in the high-speed, low-latency mobile communication network, which will be introduced in the future, in the 5G environment, MIMO technology will be adopted to meet the evolving trend for large data / high-speed transmission.

However, by adopting MIMO technology, when the base station 100 and the terminal 10 provide / use communication services with multiple antenna beams (eg, dual antenna beams), the base station 100 transmits data to the terminal 10. The downlink transmission to be transmitted and the uplink transmission to which the terminal 10 transmits data to the base station 100 are defined as mutually identical patterns.

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

That is, the base station 100 as the data transmission apparatus of the present invention transmits downlink data by realizing (using) the new flexible TDD frame structure of the present invention when transmitting the downlink.

On the other hand, the terminal 10 as the data transmission device of the present invention transmits uplink data by realizing (using) the new flexible TDD frame structure of the present invention when transmitting the uplink.

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

The 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 response signals 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 through the data channel of the immediately preceding subframe.

In this case, the subframe structure illustrated in FIG. 4 is a structure for improving high-speed low-latency (URLLC) performance, and will be referred to as a low-latency transmission structure below.

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

For example, the subframe is composed of a plurality of symbols, for example, 14 ODFM symbols, and the data channel through which downlink data is transmitted is the 2nd symbol (symbol 1) to the 12th symbol (symbol 11) among the 14 ODFM symbols. It is assumed that the data channel through which uplink data is transmitted is allocated from the 3rd symbol (symbol 2) to the 13th symbol (symbol 12) among 14 ODFM symbols.

In this case, in the subframe of the low-latency transmission structure, the uplink control channel is after a symbol interval (symbol 1 to symbol 11 and / or symbol 2 to symbol 12) to which a data channel is allocated among 14 ODFM symbols constituting the subframe. It is preferably assigned to the symbol of.

In addition, in the subframe of the low-latency transmission structure, the downlink control channel, among the 14 ODFM symbols constituting the subframe, is before a symbol interval (symbol 1 to symbol 11 and / or symbol 2 to symbol 12) to which a data channel is allocated. It is preferably assigned to the symbol of.

In this case, although not shown in FIG. 4, the reason why the symbol interval to which the data channel is allocated is symbol 1 to symbol 11 in the case of downlink and symbol 2 to symbol 12 in the case of uplink, is GP for downlink / uplink change. To allocate (Guard Period).

Accordingly, in the subframe of the low-latency transmission structure, the uplink control channel is allocated to the last symbol 13 of the 14 ODFM symbols constituting the subframe, and the downlink control channel is the first of the 14 ODFM symbols constituting the subframe. It is preferably assigned to symbol 0.

Accordingly, more specifically, as illustrated in FIG. 4, the low-delay subframe according to the new flexible TDD frame structure of the present invention is the last symbol 13 among 14 ODFM symbols constituting the subframe in both downlink / uplink. The uplink control channel is included in the xPUCCH allocated to, and the downlink channel can be included in the xPDCCH allocated to the first symbol 0.

In addition, the low-latency subframe includes a data channel (xPDSCH or xPUSCH) and a GP (not shown) transmitted downlink or uplink between xPDCCH and xPUCCH.

Accordingly, the base station 100 as a data transmission device of the present invention, when transmitting the downlink, constitutes a low-latency downlink subframe according to the flexible TDD frame structure of the present invention shown in FIG. 4, and a low-latency downlink subframe. Data can be transmitted to the terminal 10 using # 1, # 2, # 3 ...

At this time, the base station 100, through a separate System Information Block (SIB) or low-latency downlink subframes # 1, # 2, # 3 ... each xPDCCH, information about the subframe structure or transmission mode ( Low-latency transmission structure or low-latency transmission mode) will be transmitted to the terminal (10).

Accordingly, the terminal 10 recognizing the received information (low-latency transmission structure or low-latency transmission mode) controls uplink to each of the low-latency downlink subframes # 1, # 2, # 3 ... of the present invention. Due to the structure in which the channel (xPUCCH) exists, the response signal of ACK / NACK for each downlink data transmitted through the xPDSCH of the low-latency downlink subframes # 1, # 2, # 3 ... is the same. Since a response signal in a subframe unit can be transmitted by transmitting through the xPUCCH of a frame (t _d1 , t _d2 , t _d3 ...), actual transmission of downlink data is performed in units of transmission time of each subframe. I can see.

In addition, the terminal 10 as a data transmission device of the present invention, in the case of uplink transmission, shown in FIG. 4 in the same pattern based on the information (low-latency transmission structure or low-latency transmission mode) previously received from the base station 10 A low-latency uplink subframe according to the flexible TDD frame structure of the present invention may be configured and data may be transmitted to the base station 100 using the same.

At this time, due to the structure in which the downlink control channel (xPDCCH) exists in each of the low-latency uplink subframes # 1, # 2, and # 3 of the present invention, the base station 100 has a low-latency uplink subframe. The response signal of each subframe can be transmitted by transmitting the response signal of ACK / NACK for each uplink data transmitted through xPUSCH of # 1, # 2, # 3 ... through xPDCCH of the next subframe. Because (t _u1 , t _u2 ...), it can be considered that the actual transmission of uplink data is performed in units of transmission time of each subframe.

As described above, since the flexible TDD frame structure proposed in the present invention configures a downlink / uplink control channel (PDCCH, PUCCH) in a single subframe when transmitting downlink / uplink data, each subframe constituting a frame Since data and response signals are transmitted and received in units (units of transmission time of subframes) to transmit data in near real time, high-speed low-latency (URLLC) performance aimed at 5G can be improved.

On the other hand, in the above, the flexible TDD frame structure proposed in the present invention is described as a structure in which data and response signals in subframe units are transmitted and transmitted in near real-time data (low delay transmission structure).

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

The subframe of the high-speed transmission structure according to the flexible TDD frame structure of the present invention has a basic structure in which high-speed data transmission is achieved by minimizing transmission of an ACK / NACK response signal when transmitting a large amount of downlink or uplink data.

The subframe of the high-speed transmission structure according to the new flexible TDD frame structure of the present invention is a group unit composed of two or more subframes, and all subframes in the group include a data channel for downlink or uplink data transmission, and the group Only my last subframe includes an uplink control channel for a response signal for downlink data transmitted through this group's data channel, and only the first subframe in the subframe group is up. And a downlink control channel for a response signal for link data.

5 shows a subframe (downlink high-speed subframe) of a downlink high-speed transmission structure for downlink high-speed transmission and a subframe (uplink high-speed subframe) of an uplink high-speed transmission structure for uplink high-speed transmission. Doing.

In the case of the downlink, as shown in FIG. 5, in the group (subframe group # 1) composed of two or more subframes, only the first subframe # 1 in the subframe group # 1 is the immediately preceding group (eg, a subframe) Group # 0) includes a downlink control channel (xPDCCH) for a response signal for uplink data transmitted through the data channel (xPUSCH).

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

Of course, a 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.

And, only the last subframe #N in subframe group # 1 includes an uplink control channel (xPUSCH) for a response signal for downlink data transmitted through the data channel (xPDSCH) of this subframe group # 1. .

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

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

And, subframes # 2, # 3 ... # N-1 between the first and last subframes in subframe group # 1 are assigned only data channels (xPDSCH) to all 14 ODFM symbols.

On the other hand, in the case of uplink, as shown in FIG. 5, in a group (subframe group # 2) composed of two or more subframes, only the first subframe # 1 in subframe group # 2 is the immediately preceding group (eg: It includes a downlink control channel (xPDCCH) for a response signal for uplink data transmitted through the data channel (xPUSCH) of subframe group # 1).

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

Of course, although not shown in FIG. 5, the GP for changing the downlink / uplink is assigned to the second symbol 1 of the first subframe # 1, and the data channel (xPUSCH) to the remaining symbols, that is, the third symbol 2 to the last symbol 13 Is assigned.

In addition, only the last subframe #M in subframe group # 2 includes an uplink control channel (xPUSCH).

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

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

And, subframes # 2, # 3 ... # M-1 between the first and last subframes in subframe group # 1 are assigned only data channels (xPUSCH) to all 14 ODFM symbols.

Thus, the base station 100 as a data transmission device of the present invention, when transmitting a large amount of downlink, the downlink high-speed subframe 1, # 2, # 3 according to the flexible TDD frame structure of the present invention shown in FIG. A subframe group grouped with. # N may be configured, and a large amount of data may be transmitted to the terminal 10 using the same.

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

In addition, the terminal 10 recognizing the received information (low-latency transmission structure or low-latency transmission mode) is a subframe grouped by downlink high-speed subframes 1, # 2, # 3 ... # N of the present invention. Due to the structure in which only one uplink control channel (xPUSCH) exists in the group, ACK / NACK response signals for all downlink data transmitted through the xPDSCH of the subframe group are transmitted through a single xPUCCH in the same subframe group. Since a response signal in a subframe group unit can be transmitted in a manner (t _d11 ...), it can be considered that actual transmission of downlink data is performed in units of transmission time of each subframe group.

In addition, the terminal 10 as a data transmission device of the present invention, when transmitting a large amount of uplink, uplink high-speed subframes # 1, # 2, # 3 according to the flexible TDD frame structure of the present invention shown in FIG. A subframe group grouped with .. # M may be configured, and a large amount of data may be transmitted to the base station 100 using the same.

To this end, the base station 100 transmits information on the subframe structure or transmission mode (uplink high-speed transmission structure or uplink high-speed transmission mode) to the terminal 10 through a separate SIB or subframe group xPDCCH. The process of doing so will be preceded.

At this time, due to the structure in which only one downlink control channel (xPDCCH) exists in a group of subframes grouped into uplink fast subframes 1, # 2, # 3 ... # M of the present invention, the base station 100 Since the response signals of ACK / NACK for all uplink data transmitted through the xPUSCH of the subframe group are transmitted through a single xPDCCH in the next subframe group, the response signals of each subframe group can be transmitted (t _U11 ...), it can be seen that the actual transmission of the uplink data is performed in units of transmission time of each subframe group.

As described above, in the flexible TDD frame structure proposed in the present invention, when transmitting a large amount of downlink / uplink data, a downlink / uplink control channel (PDCCH, PUCCH) is configured in units of subframe groups, and each subframe group unit ( Since data and response signals are transmitted and received in units of transmission time in a subframe group), real-time performance may be slightly reduced compared to the low-latency transmission structure described above, but high-speed transmission of large amounts of data is minimized by minimizing the transmission of ACK / NACK response signals. Since it is made, it is possible to improve the high-speed low-latency (URLLC) performance aimed at 5G.

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

Hereinafter, a data transmission device that transmits data using the flexible TDD frame structure of the present invention will be described in detail with reference to FIG. 3.

As mentioned above, the data transmission apparatus of the present invention may be a base station 100 or a terminal 10. However, for convenience of description, reference will be made to the base station 100 by referring to it.

As illustrated in FIG. 3, the data transmission apparatus 100 of the present invention includes a transmission mode confirmation unit 110 that checks a transmission mode mapped to a type of data traffic to be transmitted, among a plurality of transmission modes, and the above-described confirmation. And a data transmission unit 120 that transmits the data traffic using a subframe having a structure according to a transmission mode.

Here, the plurality of transmission modes means a low-latency transmission mode, a downlink high-speed transmission mode, and an uplink high-speed transmission mode.

The transmission mode checking unit 110 checks a transmission mode mapped to a type of data traffic to be transmitted among a plurality of transmission modes, that is, a low-latency transmission mode / downlink high-speed transmission mode / uplink high-speed transmission mode.

In more detail, the transmission mode checking unit 110 identifies a type of data traffic for transmission to the terminal 10, and to which of the transmission modes the data traffic types are mapped by type in advance. It is to check if it is applicable.

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

In addition, mapping 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 real-time, type 2 requiring downlink high-speed transmission, and type 3 requiring uplink high-speed transmission. It is assumed that the type 2 downlink high speed transmission mode and the type 3 uplink high speed transmission mode are mapped.

Accordingly, the transmission mode checking unit 110 identifies which type of data traffic to be transmitted to the terminal 10 is among types 1, 2, and 3, and checks a 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 identified transmission mode.

For example, if the transmission mode in which the type of data traffic is mapped is a low-latency transmission mode, for example, the data transmission unit 120 is a data channel (xPDSCH or xPUSCH) through which downlink or uplink data is transmitted, this time sub Uplink control channel (xPUCCH) for a response signal for downlink data transmitted through a data channel of a frame, Downlink control channel (xPDCCH) for a response signal for uplink data transmitted through a data channel of a previous subframe Using a sub-frame of the low-latency transmission structure including a, transmit and receive data and response signals in units of subframes.

That is, the data transmission unit 120 configures the low-latency downlink subframe according to the flexible TDD frame structure of the present invention shown in FIG. 4 according to the confirmed low-latency transmission mode, and the low-latency downlink subframe # 1 , # 2, # 3 ... can be used to transmit data to the terminal 10.

At this time, the data transmission unit 120, through a separate SIB (System Information Block) or low-delay downlink subframe # 1, # 2, # 3 ... each of the xPDCCH, for the subframe structure or transmission mode Information (low-latency transmission structure or low-latency transmission mode) will be delivered to the terminal 10.

Accordingly, the terminal 10 recognizing the received information (low-latency transmission structure or low-latency transmission mode) controls uplink to each of the low-latency downlink subframes # 1, # 2, # 3 ... of the present invention. Due to the structure in which the channel (xPUCCH) exists, the response signal of ACK / NACK for each downlink data transmitted through the xPDSCH of the low-latency downlink subframes # 1, # 2, # 3 ... is the same. Since a response signal in a subframe unit can be transmitted by transmitting through the xPUCCH of a frame (t _d1 , t _d2 , t _d3 ...), actual transmission of downlink data is performed in units of transmission time of each subframe. I can see.

On the other hand, if the data transmission apparatus of the present invention is the terminal 10, the transmission mode confirmation unit (not shown) in the terminal 10, the information previously received from the base station 10 (low-latency transmission structure or low-latency transmission mode) Based on the low-delay transmission mode is checked.

And, the data transmission unit (not shown) in the terminal 10, according to the confirmed low-latency transmission mode, the low-latency uplink subframe # 1, # 2 according to the flexible TDD frame structure of the present invention shown in FIG. # 3 ... can be configured and data can be transmitted to the base station 100 using the same.

At this time, due to the structure in which the downlink control channel (xPDCCH) exists in each of the low-latency uplink subframes # 1, # 2, and # 3 of the present invention, the base station 100 has a low-latency uplink subframe. The response signal of each subframe can be transmitted by transmitting the response signal of ACK / NACK for each uplink data transmitted through xPUSCH of # 1, # 2, # 3 ... through xPDCCH of the next subframe. Because (t _u1 , t _u2 ...), it can be considered that the actual transmission of uplink data is performed in units of transmission time of each subframe.

On the other hand, the data transmission unit 120, if the transmission mode is the type of data traffic is mapped in the downlink or uplink high-speed transmission mode, in the group unit consisting of two or more subframes, all subframes in the group is down It includes a data channel (xPDSCH or xPUSCH) for link or uplink data transmission, and only the last subframe in the group is an uplink control channel (xPUCCH) for a response signal for downlink data transmitted through this group's data channel. Including, only the first sub-frame in the sub-frame group by using a sub-frame of a high-speed transmission structure including a downlink control channel (xPDCCH) for the response signal for the uplink data transmitted through the previous group data channel , Transmit and receive data and response signals in units of subframe groups.

That is, when the downlink high-speed transmission mode is confirmed, the data transmission unit 120 downlink high-speed subframes 1 and # 2 according to the flexible TDD frame structure of the present invention shown in FIG. 5 according to the downlink high-speed transmission mode. A group of subframes grouped with, # 3 ... # N may be configured, and a large amount of data may be transmitted to the terminal 10 using the same.

At this time, the data transmission unit 120, through a separate SIB or subframe group xPDCCH, information on the subframe structure or transmission mode (downlink high-speed transmission structure or downlink high-speed transmission mode) to the terminal 10 Will deliver.

Accordingly, the terminal 10 recognizing the received information (downlink high-speed transmission structure or downlink high-speed transmission mode) is grouped into the downlink high-speed subframes 1, # 2, # 3 ... # N of the present invention. Due to a structure in which only one uplink control channel (xPUSCH) exists in a subframe group, a response signal of ACK / NACK for all downlink data transmitted through xPDSCH of a subframe group is a single xPUCCH in the same subframe group. Since a response signal in a subframe group unit can be transmitted in a transmission method (t _d11 ...), it can be considered that actual transmission of downlink data is performed in units of transmission time of each subframe group.

On the other hand, when the uplink high-speed transmission mode is confirmed, the data transmission unit 120, information on the subframe structure or transmission mode (uplink high-speed transmission structure or uplink high-speed, through xPDCCH of a separate SIB or subframe group) Transmission mode) to the terminal 10.

Accordingly, the transmission mode checking unit (not shown) in the terminal 10 as the data transmission device of the present invention is based on information received from the base station 10 (uplink high-speed transmission structure or uplink high-speed transmission mode) uplink high speed. Check the transmission mode.

And, the data transmission unit (not shown) in the terminal 10, according to the identified uplink high-speed transmission mode, uplink high-speed subframe # 1, # 2 according to the flexible TDD frame structure of the present invention shown in FIG. A subframe group grouped with # 3 ... # M may be configured, and a large amount of data may be transmitted to the base station 100 using the same.

At this time, due to the structure in which only one downlink control channel (xPDCCH) exists in a group of subframes grouped into uplink fast subframes 1, # 2, # 3 ... # M of the present invention, the base station 100 Since the response signals of ACK / NACK for all uplink data transmitted through the xPUSCH of the subframe group are transmitted through a single xPDCCH in the next subframe group, the response signals of each subframe group can be transmitted (t _U11 ...), it can be seen that the actual transmission of the uplink data is performed in units of transmission time of each subframe group.

On the other hand, from the standpoint of the base station 100, data is transmitted and received with a plurality of terminals, and since the entire radio resource for data transmission and reception is limited, the above-described transmission mode (low delay / downlink high speed / uplink high speed transmission mode) is used. It needs to be balanced.

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 ratio for each transmission mode and a usage order for each transmission mode.

Here, the usage ratio for each transmission mode, that is, the usage ratio of each of the low-latency / downlink high-speed / uplink high-speed transmission modes may be determined, for example, as A, B, C (A + B + C = 100).

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

For example, referring to the low-latency transmission mode, if data traffic mapped to the low-latency transmission mode is identified, this time is not used if the low-latency transmission mode was previously used to check the data traffic mapped to the low-latency transmission mode. If the data traffic mapped to the low-latency transmission mode is not previously used and the low-delay transmission mode is not used, the current use order 1 or the low-delay transmission mode utilization ratio (A = 40) is less than a specific value (eg, majority) In the situation used as a low-delay transmission mode is used unconditionally, and when the situation is used above a certain value (for example, majority), it can be variously set to use sequence 2 according to the usage sequence 1.

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

At this time, the data transmission device 100 is based on the big data that accumulates and holds the type of data traffic (transmission mode type) and the total traffic amount for each time zone provided to a plurality of terminals for each time zone, and thus, as much as possible in limited radio resources. In order to provide a high-speed low-latency service to many terminals, it is desirable to update the usage ratio for each transmission mode and the usage order for each transmission mode.

In addition, the updating period is preferably a preset period in relation to the transmission time of a single frame composed of a plurality of subframes.

For example, assuming that a single frame is composed of 50 subframes having a transmission time of 0.2 ms, the transmission time of a single frame will be 10 ms.

In this case, the period to update can be preset to L * 10ms (L is variable).

When data traffic occurs, the data transmission unit 120 determines whether to use the transmission mode mapped to the type of the data traffic that has occurred, according to at least one of a preset usage rate for each transmission mode and a usage order for each transmission mode. Judge.

For example, when new data traffic mapped to the low-latency transmission mode is generated, the data transmission unit 120 instead of using the low-latency transmission mode unconditionally, the usage rate for each transmission mode periodically updated and the usage order for each transmission mode. Accordingly, by determining whether to use the low-latency transmission mode, the transmission mode (low-delay / downlink high-speed / uplink high-speed transmission mode) is balancedly used.

Of course, in the case of data traffic mapped to the downlink high-speed transmission mode and the uplink high-speed transmission mode, it will also be the same.

As described above, the data transmission device of the present invention is a new flexible TDD frame structure (low delay / downlink high speed / up suitable for a mobile communication network environment for supporting high-speed low-latency communication, which will appear in the future) Link high speed) to derive the effect of supporting high-speed low-latency performance in a 5G environment.

In addition, the data transmission apparatus of the present invention, by considering the limited radio resources, flexible TDD frame structure (low delay / downlink high speed / uplink high speed) by operating the transmission mode (subframe structure) fluidly, high-speed low 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. 6.

For convenience of description, the base station 100 will be described with reference to the data transmission device in accordance with the preceding description.

In the data transmission method of the base station 100 according to the present invention, in the power-on (ON) state of the base station, the usage ratio for each transmission mode and the usage order for each transmission mode are updated every predetermined period (for example, L * 10 ms) (setting ) Is performed (S100).

At this time, the data transmission method of the base station 100 according to the present invention is based on big data that accumulates and holds the type of data traffic (transmission mode type) and the total traffic amount for each time zone provided to a plurality of terminals for each time zone. In order to provide a high-speed low-latency service to as many terminals as possible in a limited radio resource, it is desirable to update the usage ratio for each transmission mode and the usage order for each transmission mode.

In addition, in the data transmission method of the base station 100 according to the present invention, when data traffic for transmission to a terminal such as the terminal 10 is generated (S110), multiple transmission modes, i.e., low-latency transmission mode / downlink high-speed transmission mode / Check the transmission mode mapped to the type of data traffic among the uplink high-speed transmission modes (S120).

Hereinafter, the types of data traffic are classified into type 1 requiring real-time real-time, type 2 requiring downlink high-speed transmission, and type 3 requiring uplink high-speed transmission, type 1-low-latency transmission mode, type 2 It is assumed that the downlink high-speed transmission mode and the type 3- uplink high-speed transmission mode are mapped.

Accordingly, the data transmission method of the base station 100 according to the present invention identifies which type of data traffic for transmission to the terminal 10 is among types 1, 2, and 3, and the type of data traffic is mapped. It is to check the transmission mode.

In the data transmission method of the base station 100 according to the present invention, instead of using the transmission mode checked in step S120 unconditionally, the transmission mode checked this time according to the usage ratio for each transmission mode periodically updated through the step S100 and the usage order for each transmission mode. It is determined whether or not to use (S130).

Accordingly, in the data transmission method of the base station 100 according to the present invention, when it is determined in step S130 that the current transmission mode is checked (S130 Yes), data traffic is transmitted using a subframe having a structure according to the checked transmission mode. Transmit (S140).

For example, the data transmission method of the base station 100 according to the present invention, if the transmission mode is determined in step S120 and determined to be used in step S130 is a low-delay transmission mode, according to the low-delay transmission mode in Figure 4 A low-latency downlink subframe according to the illustrated flexible TDD frame structure of the present invention is configured, and data can be transmitted to the terminal 10 using a low-latency downlink subframe # 1, # 2, # 3 ... Yes (S140).

At this time, the data transmission method of the base station 100 according to the present invention, through a separate SIB or low-delay downlink subframe # 1, # 2, # 3 ... each xPDCCH, to the subframe structure or transmission mode Information (low-latency transmission structure or low-latency transmission mode) can be transmitted to the terminal 10 to inform.

Accordingly, the terminal 10 recognizing the received information (low-latency transmission structure or low-latency transmission mode) controls uplink to each of the low-latency downlink subframes # 1, # 2, # 3 ... of the present invention. Due to the structure in which the channel (xPUCCH) exists, the response signal of ACK / NACK for each downlink data transmitted through the xPDSCH of the low-latency downlink subframes # 1, # 2, # 3 ... is the same. Since a response signal in a subframe unit can be transmitted by transmitting through the xPUCCH of a frame (t _d1 , t _d2 , t _d3 ...), actual transmission of downlink data is performed in units of transmission time of each subframe. I can see.

And, if the data transmission apparatus of the present invention is the terminal 10, the terminal 10 can check the low-latency transmission mode based on the information (low-latency transmission structure or low-latency transmission mode) previously received from the base station 10. Therefore, according to the checked low-latency transmission mode, the low-latency uplink subframes # 1, # 2, # 3 ... according to the flexible TDD frame structure of the present invention shown in FIG. 4 are configured, and the base station ( 100) can be transmitted (S150).

On the other hand, if the data transmission method of the base station 100 according to the present invention is confirmed in step S120 and the transmission mode determined in step S130 is a downlink high-speed transmission mode, according to the downlink high-speed transmission mode, FIG. 5 A subframe group grouped with downlink high-speed subframes 1, # 2, # 3 ... # N according to the flexible TDD frame structure of the present invention shown in FIG. 1 is configured, and a large amount of data is transmitted to the terminal 10 using the same. It may be transmitted (S140).

At this time, the data transmission method of the base station 100 according to the present invention, information on the subframe structure or transmission mode through a separate SIB or subframe group xPDCCH (downlink high-speed transmission structure or downlink high-speed transmission mode) To the terminal 10 to inform.

Accordingly, the terminal 10 recognizing the received information (downlink high-speed transmission structure or downlink high-speed transmission mode) is grouped into the downlink high-speed subframes 1, # 2, # 3 ... # N of the present invention. Due to a structure in which only one uplink control channel (xPUSCH) exists in a subframe group, a response signal of ACK / NACK for all downlink data transmitted through xPDSCH of a subframe group is a single xPUCCH in the same subframe group. Since a response signal in a subframe group unit can be transmitted in a transmission method (t _d11 ...), it can be considered that actual transmission of downlink data is performed in units of transmission time of each subframe group.

Meanwhile, in the data transmission method of the base station 100 according to the present invention, if the transmission mode checked in step S120 and determined to be used in step S130 is a downlink high-speed transmission mode, xPDCCH of a separate SIB or subframe group is used. Through this, information on the subframe structure or transmission mode (uplink high-speed transmission structure or uplink high-speed transmission mode) may be transmitted to the terminal 10 to be notified (S140).

Accordingly, in the data transmission method of the terminal 10 according to the present invention, the uplink high-speed transmission mode is confirmed based on the information (uplink high-speed transmission structure or uplink high-speed transmission mode) received from the base station 10, and the uplink high-speed According to the transmission mode, a subframe group grouped with uplink high-speed subframes # 1, # 2, # 3 ... # M according to the flexible TDD frame structure of the present invention shown in FIG. 5 is configured, and using it A large amount of data can be transmitted to the base station 100 (S150).

Meanwhile, in the data transmission method of the base station 100 according to the present invention, when it is determined in step S130 that the transmission mode checked at this time is not used (S130 No), data is transmitted using a subframe having a structure determined as default. It is preferable to transmit and receive the terminal 10 (S160).

As described above, the data transmission method of the present invention is a new flexible TDD frame structure (low delay / downlink high speed / up) suitable for a mobile communication network environment for supporting high-speed low-latency communication, which will appear in the future. Link high speed) to derive the effect of supporting high-speed low-latency performance in a 5G environment.

In addition, the data transmission method of the present invention, by considering the limited radio resources, flexible TDD frame structure (low delay / downlink high speed / uplink high speed) by operating the transmission mode (subframe structure) fluidly, high-speed low The effect of maximizing the delay performance is derived.

A data transmission method according to an embodiment of the present invention may be implemented in a form of program instructions 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, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. Includes hardware devices specifically 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 code that can be executed by a computer using an interpreter, etc., as well as machine language codes produced by a compiler. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa.

The present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above-described embodiments, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims below. Anyone with ordinary knowledge in the technical idea of the present invention extends to the extent that various modifications or modifications are possible.

According to the data transmission apparatus and data transmission method according to the present invention, in that a new flexible TDD frame structure suitable for a 5G environment of a high-speed low-latency service is proposed, only the use of the related technology is exceeded as it exceeds the limitations of the existing technology It is an invention with industrial applicability since it is not only sufficient or commercially available for commercially available devices or commercially available devices.

10: terminal (data transmission device)
100: base station (data transmission device)
110: transmission mode check unit 120: data transmission unit

Claims (14)

delete delete delete delete In a data transmission apparatus in a wireless communication system for transmitting and receiving data,
A transmission mode check unit for confirming a transmission mode of data traffic to be transmitted; And
And a data transmission unit for transmitting the data traffic by using a subframe having a structure according to the identified transmission mode.
The data transmission unit,
When the transmission mode is a low-latency transmission mode,
The data channel through which the downlink or uplink data is transmitted, the uplink control channel for a response signal to the downlink data transmitted through the data channel of this subframe, and the uplink data transmitted through the data channel of the previous subframe. A data transmission device comprising transmitting and receiving data and a response signal in units of subframes using a subframe having a low-latency transmission structure including a downlink control channel for a response signal. In a data transmission apparatus in a wireless communication system for transmitting and receiving data,
A transmission mode check unit for confirming a transmission mode of data traffic to be transmitted; And
And a data transmission unit for transmitting the data traffic by using a subframe having a structure according to the identified transmission mode.
The data transmission unit,
When the transmission mode is a downlink or uplink high-speed transmission mode,
In group units composed of 2 or more subframes, all subframes in the group include a data channel for downlink or uplink data transmission, and only the last subframe in the group is used for downlink data transmitted through the data channel of this group. A high-speed transmission structure including an uplink control channel for a response signal, and a downlink control channel for a response signal for uplink data transmitted through the previous group's data channel only the first subframe in the subframe group Data transmission apparatus, characterized in that for transmitting and receiving data and a response signal in a subframe group unit using the subframe of. The method of claim 6,
The subframe between the first subframe and the last subframe in the group,
Data transmission apparatus characterized in that the structure includes only a data channel for downlink or uplink data transmission. In a data transmission apparatus in a wireless communication system for transmitting and receiving data,
A transmission mode check unit for confirming a transmission mode of data traffic to be transmitted; And
And a data transmission unit for transmitting the data traffic by using a subframe having a structure according to the identified transmission mode.
The data transmission unit,
When data traffic occurs, a data transmission device characterized in that it determines whether to use a transmission mode mapped to the type of the data traffic according to at least one of a preset use rate for each transmission mode and a usage order for each transmission mode. . The method of claim 8,
At least one of the use rate for each transmission mode and the use order for each transmission mode,
Data transmission apparatus characterized in that it is updated every predetermined period with respect to the transmission time of a single frame composed of a plurality of subframes. delete In 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 of data traffic to be transmitted; And
And a data transmission step of transmitting the data traffic using a subframe having a structure according to the identified transmission mode.
The data transmission step,
When the transmission mode is a low-latency transmission mode,
The data channel through which the downlink or uplink data is transmitted, the uplink control channel for a response signal to the downlink data transmitted through the data channel of this subframe, and the uplink data transmitted through the data channel of the previous subframe. A data transmission method comprising transmitting and receiving data and a response signal in units of subframes by using a subframe having a low-latency transmission structure including a downlink control channel for a response signal. In 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 of data traffic to be transmitted; And
And a data transmission step of transmitting the data traffic using a subframe having a structure according to the identified transmission mode.
The data transmission step,
When the transmission mode is a downlink or uplink high-speed transmission mode,
In group units composed of 2 or more subframes, all subframes in the group include a data channel for downlink or uplink data transmission, and only the last subframe in the group is used for downlink data transmitted through the data channel of this group. A high-speed transmission structure including an uplink control channel for a response signal, and a downlink control channel for a response signal for uplink data transmitted through the previous group's data channel only the first subframe in the subframe group Data transmission method characterized in that by using the sub-frame, the data and response signals are transmitted and received in sub-frame group units. The method of claim 12,
The subframe between the first subframe and the last subframe in the group,
Data transmission method characterized in that the structure includes only a data channel for downlink or uplink data transmission. In 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 of data traffic to be transmitted; And
And a data transmission step of transmitting the data traffic using a subframe having a structure according to the identified transmission mode.
When data traffic occurs, the transmission mode mapped to the type of the data traffic according to at least one of a preset use order for each transmission mode and a preset use order for each transmission mode in all radio resources for data transmission and reception. And determining whether or not to use the data transmission method.

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