KR102607061B1 - Method and apparatus for receiving data, and method for transmitting data in mobile communication system - Google Patents

Abstract

The base station sets the minimum unit of time resources for transmitting data in a subframe containing a plurality of subslots to a short transmission time interval (TTI) corresponding to the length of one subslot, and within the short TTI, RS ( After the terminal determines the RS type to be used for transmission among a plurality of RS types according to the location of the reference signal, the terminal transmits RS type information to be used for transmission to the terminal.

Description

Data reception method and device and data transmission method in a mobile communication system {METHOD AND APPARATUS FOR RECEIVING DATA, AND METHOD FOR TRANSMITTING DATA IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a method and device for receiving data and a method for transmitting data in a mobile communication system, and particularly to a device and method for receiving data and a method for transmitting data to increase transmission efficiency.

In the LTE (Long Term Evolution) system, one frame consists of 10 subframes, each subframe consists of 2 slots, and each slot has 7 or 6 slots depending on the length of CP (Cyclic Prefix). It consists of symbols. The data transmission unit, Transmission Time Interval (TTI), is 1ms, which is the same as the subframe unit.

The uplink subframe used in the LTE system is divided into a control area where PUCCH (Physical Uplink Control CHannel) is allocated and a data area where PUSCH (Physical Uplink Shared CHannel) is allocated in the frequency domain. In the uplink, the Reference Signal (RS), unlike data, is not precoded and consists of Demodulation RS (DMRS) and Sounding RS (SRS). DMRS is a reference signal for acquiring channel information for demodulation of uplink data, and SRS is a reference signal used to measure the uplink channel.

In order to provide a wider variety of services compared to the 4th generation communication system, the 5th generation communication system requires low-latency technology that can quickly exchange data between the base station and the terminal.

In the LTE system, TTI only takes 1ms of transmission time in the wireless section, so it is necessary to reduce the length of TTI for low delay. Also, considering HARQ (Hybrid Automatic Repeat Request), it is necessary to reduce the demodulation time after the base station or terminal receives the signal. For example, if the length of a TTI is x ms and a HARQ retransmission is sent after 3 TTIs, the maximum allowable demodulation delay is 3x. A decrease in the TTI length increases the DMRS overhead (ratio of the number of data subcarriers to the number of DMRS subcarriers) to maintain the same channel estimation performance, and reducing the DMRS overhead may deteriorate channel estimation performance. For example, when the TTI is 2 symbols, a DMRS of 1 symbol is required to obtain the same channel estimation performance as when the TTI is 1 ms and intra frame hopping is performed. In this case, the DMRS overhead is 1 ms. It increases from 14% to 50%. Additionally, the requirement to reduce demodulation delay may cause performance degradation problems by creating restrictions on the location of PUSCH or PUCCH in resource elements consisting of subcarriers and symbols.

For example, if TTI consists of two symbols and the DMRS is located in the first symbol to reduce demodulation delay, channel estimation can be performed by receiving only the first symbol, and the time required for channel estimation can be reduced. This can reduce demodulation delay. However, because the number of data subcarriers used between the first symbol and the second symbol is different, symbol hopping is restricted, resulting in performance degradation. Additionally, in systems where low delay is important, SC-FDMA (Single-carrier Frequency Division Multiple Access) applied to the LTE system has the effect of improving PAPR (Peak to average-Power ratio), but causes demodulation delay.

The problem to be solved by the present invention is to provide a data reception method and device and a data transmission method in a mobile communication system that can reduce DMRS overhead and demodulation delay.

According to one embodiment of the present invention, a method for receiving data from a terminal at a base station is provided. The data reception method includes setting the minimum unit of time resources for transmitting data in a subframe including a plurality of subslots to a short transmission time interval (TTI) corresponding to the length of one subslot, within the short TTI It includes determining an RS type to be used by the terminal for transmission among a plurality of RS types according to the position of a reference signal (RS), and transmitting RS type information to be used by the terminal for transmission to the terminal.

The determining step is to determine the RS to be used by the terminal in consideration of at least one of the channel state between the base station and the terminal, demodulation delay time, movement speed of the terminal, an RS type that the terminal can transmit, and an RS type that the base station can demodulate. It may include the step of determining the type.

The data reception method may further include receiving a Sounding RS (SRS) from the terminal, and estimating a channel state between the base station and the terminal from the SRS.

The determining step may further include receiving RS type information that the terminal can transmit from the terminal.

The data reception method includes determining a transmission block structure to be applied to the terminal and a reception block structure to be applied to the base station corresponding to the transmission block structure, and transmitting transmission block structure information to be applied to the terminal to the terminal. Additional steps may be included.

The data reception method includes configuring transmission blocks according to the transmission block structure, processing data according to the function of the configured transmission block, and storing RS and processed data into resource elements according to the RS type that the terminal will use for transmission. A step of mapping and transmitting may be further included.

The step of determining the transmission block structure and the reception block structure includes the channel state between the base station and the terminal, the configurable transmission block structure and data requirements of the terminal, the movement speed of the terminal, and the reception block structure configurable by the base station. It may include determining the transmission block structure and the reception block structure by considering at least one of them.

The transmission block structure information may include information on a transmission block whose function is to be turned off among configurable transmission blocks of the terminal.

The data reception method includes updating a transmission block structure to be applied to the terminal and a reception block structure to be applied to the base station in response to the transmission block structure based on at least one of a request from the terminal or a requirement for the data. More may be included.

The data reception method may further include updating the RS type to be used by the terminal for transmission from the channel state between the base station and the terminal.

The RS may include Demodulation RS (DMRS).

According to another embodiment of the present invention, a method for transmitting data from a terminal is provided. The data transmission method is one of a plurality of RS types according to the position of the RS (reference signal) within a short TTI set to the length of one subslot as the minimum unit of time resources for transmitting data in a subframe including a plurality of subslots. Transmitting RS type information that the terminal can transmit to a base station, receiving RS type information to be used by the terminal for transmission from the base station, and mapping RS and data to resource elements according to the RS type information. do.

The data transmission method includes the steps of transmitting transmission block information that can be configured by the terminal to the base station, receiving transmission block information to be used by the terminal from the base station, and a transmission block configured according to the transmission block information to be used by the terminal. It may further include processing the data according to its function.

The transmission block to be used by the terminal takes into account at least one of the channel state between the base station and the terminal, the configurable transmission block structure and data requirements of the terminal, the movement speed of the terminal, and the reception block structure configurable by the base station. can be decided.

The RS type to be used by the terminal for transmission may be determined by the base station by considering at least one of the channel state, demodulation delay time, movement speed of the terminal, an RS type that the terminal can transmit, and an RS type that the base station can demodulate. .

The RS may include Demodulation RS (DMRS).

According to another embodiment of the present invention, an apparatus for receiving data from a terminal at a base station is provided. The data receiving device includes a processor and a transceiver. The processor sets the minimum unit of time resources for transmitting data in a subframe including a plurality of subslots to a short transmission time interval (TTI) corresponding to the length of one subslot, and DMRS within the short TTI The terminal determines the DMRS type to be used for transmission among a plurality of DMRS types according to the location of the demodulation reference signal, and determines the transmission block structure to be used by the terminal. And the transceiver transmits DMRS type information to be used by the terminal for transmission and transmission block structure information to be used by the terminal to the terminal.

The processor determines the DMRS type to be used for transmission by the terminal in consideration of at least one of the channel status between the base station and the terminal, demodulation delay time, movement speed of the terminal, a DMRS type that the terminal can transmit, and a DMRS type that the base station can demodulate. You can decide.

The processor considers at least one of the channel status between the base station and the terminal, the configurable transmission block structure and data requirements of the terminal, the movement speed of the terminal, and the reception block structure configurable by the base station to determine the transmission block to be used by the terminal. structure can be determined.

The transmission block structure information may include information on a transmission block whose function is to be turned off among configurable transmission blocks of the terminal.

According to an embodiment of the present invention, DMRS overhead can be reduced and demodulation delay can be reduced by determining the DMRS type and transmission block function in consideration of the channel environment or limited demodulation time.

Figure 1 is a diagram showing an uplink subframe in a mobile communication system.
Figure 2 is a diagram showing an example of a frame structure with a short TTI according to an embodiment of the present invention.
Figures 3 to 7 are diagrams showing DMRS locations according to an embodiment of the present invention, respectively.
Figure 8 is a diagram showing a method for transmitting and receiving data between a base station and a terminal according to an embodiment of the present invention.
Figure 9 is a diagram showing an example of configuring a data transmission device and a data reception device in block units according to an embodiment of the present invention.
Figure 10 is a diagram schematically showing a data transmission device in the LTE system.
FIG. 11 is a diagram schematically showing a data reception device corresponding to the data transmission device shown in FIG. 10.
Figure 12 is a diagram showing a method for transmitting and receiving data between a terminal and a base station according to another embodiment of the present invention.
Figure 13 is a diagram showing a data transmission device of a terminal according to an embodiment of the present invention.
Figure 14 is a diagram showing a data reception device of a base station according to an embodiment of the present invention.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification and claims, when a part is said to “include” a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

Throughout the specification, terminal refers to a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), and a high reliability mobile station (HR-MS). , may refer to a subscriber station (SS), portable subscriber station (PSS), access terminal (AT), user equipment (UE), etc., MT, MS, AMS , may include all or part of the functions of HR-MS, SS, PSS, AT, UE, etc.

In addition, the base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), access point (AP), radio access station (RAS), base transceiver station (BTS), mobile multihop relay (MMR)-BS, relay that acts as a base station station (RS), a relay node (RN) that acts as a base station, an advanced relay station (ARS) that acts as a base station, and a high reliability relay station (HR) that acts as a base station. -RS), small base station [femto BS, home node B (HNB), home eNodeB (HeNB), pico BS, metro BS, micro BS ), etc.], etc., and may include all or part of the functions of ABS, NodeB, eNodeB, AP, RAS, BTS, MMR-BS, RS, RN, ARS, HR-RS, small base station, etc. there is.

Now, a data reception method and device in a mobile communication system and a data transmission method according to an embodiment of the present invention will be described in detail with reference to the drawings.

Figure 1 is a diagram showing an uplink subframe in a mobile communication system.

Referring to Figure 1, in the LTE (Long Term Evolution) system, a representative mobile communication system, one frame has a length of 10 ms in the time domain and has 20 slots (#0 to #19) with a length of 0.5 ms. Includes. One subframe has a length of 1ms and consists of two slots. Each slot includes a plurality of symbols in the time domain and a plurality of subcarriers in the frequency domain. The symbol may be called an Orthogonal Frequency Division Multiplex (OFDM) symbol, an OFDMA symbol, or a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol, etc., depending on the multiple access method. The number of symbols included in one slot can vary depending on the channel bandwidth or the length of the CP (cyclic prefix). For example, in the case of normal CP, one slot includes 7 symbols, but in the case of extended CP, one slot includes 6 symbols.

In the case of a frequency division duplex (FDD) frame in which downlink and uplink are divided into the frequency domain, the downlink subframe can be divided into a control region and a data region in the time domain. The control area may be assigned a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator Channel (PCFICH), a Physical Hybrid automatic retransmit request Indicator Channel (PHICH), etc. The data area includes a physical downlink shared channel (PDSCH) for transmitting downlink data. The uplink subframe can be divided into a control area and a data area in the frequency domain. A Physical Uplink Control Channel (PUCCH) for transmitting uplink control information (UCI) is allocated to the control area. The data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting uplink data. Additionally, DMRS for demodulation of uplink signals is allocated to the control area and data area, and some symbols in the data area are used to transmit SRS. SRS may be assigned to the last symbol of the subframe.

The LTE system defines the minimum unit of time resources for transmitting data as TTI, and is set equal to the length of one subframe. That is, TTI has a length of 1ms. And Resource Block (RB), the basic unit for data transmission in the physical layer, consists of multiple symbols and multiple subcarriers. For example, in the case of general CP, one RB may consist of 12 subcarriers and 7 symbols.

However, TTI with a length of 1 ms used in the LTE system is not suitable for low-delay services that require end-to-end transmission delay of 1 ms or less.

Figure 2 is a diagram showing an example of a frame structure with a short TTI according to an embodiment of the present invention.

Referring to FIG. 2, one subframe may be composed of a plurality of subslots. Each subslot can contain two symbols.

In this way, in a subframe composed of a plurality of subslots, TTI is set to the length of one subslot. In other words, TTI is set equal to the length of two symbols, and has a time length of about 1/7 compared to the existing TTI with a length of 1 ms. At this time, in order to distinguish it from the TTI of the existing LTE system, the TTI set to the length of one subslot is referred to below as short TTI.

Below, for convenience, the description is based on a subslot composed of two symbols, but the number of symbols constituting a subslot can be changed within the range of ensuring that one subslot has a length of 1 ms or less. For example, one subslot may contain three symbols.

The uplink subframe with such a short TTI can be divided into a control area and a data area in the frequency domain as before. And some symbols among the uplink subframes may be used for SRS transmission.

Figures 3 to 7 are diagrams showing DMRS locations according to an embodiment of the present invention, respectively.

Referring to FIGS. 3 and 4, DMRS may be allocated at predetermined subcarrier intervals in the first symbol (0) and the second symbol (1). As shown in FIG. 3, the DMRS of DMRS type 1 can be located at an interval of three subcarriers in the first symbol (0) and the second symbol (1), and as shown in FIG. 4, the DMRS of DMRS type 2 DMRS can be located at six subcarrier intervals in the first symbol (0) and the second symbol (1).

Referring to Figures 5 and 6, DMRS may be allocated at a predetermined subcarrier interval in the first symbol (0). As shown in FIG. 5, the DMRS of DMRS type 3 can be located at an interval of three subcarriers from the first symbol (0), and as shown in FIG. 6, the DMRS of DMRS type 4 can be located at an interval of three subcarriers from the first symbol (0). ) can be located at six subcarrier intervals.

And referring to FIG. 7, the DMRS of DMRS type 5 is allocated at a determined subcarrier interval in the first symbol (0) and the second symbol (1), but the DMRS in the first symbol (0) and the second symbol (1) The positions of the allocated subcarriers may be different.

The subcarrier positions of the DMRS shown in FIGS. 3 to 7 and the subcarrier spacing to which the DMRS is allocated may be changed.

The larger the subcarrier spacing of DMRS, the lower the performance in channels with large delay spread, and the smaller the overhead of DMRS. Additionally, if the DMRS is allocated only to the first symbol, performance may deteriorate as the UE's movement speed increases, and the demodulation time for channel estimation is small.

Table 1 shows the overhead ratio and whether symbol hopping is possible according to the DMRS type shown in FIGS. 3 to 7.

DMRS type Type 1 Type 2 Type 3 Type 4 Type 5 Overhead ratio (%) 33.3 16.7 16.7 8.3 16.7 Is symbol hopping possible? possible possible impossible impossible possible

Therefore, DMRS can be allocated as shown in Figures 3 to 7, taking into account demodulation delay time, channel delay spread, UE mobility, etc.

Figure 8 is a diagram showing a method for transmitting and receiving data between a base station and a terminal according to an embodiment of the present invention.

Referring to FIG. 8, the terminal 100 supports various types of DMRS as shown in FIGS. 3 to 7, and transmits information on the type of DMRS that it can transmit to the base station 200 (S800). The DMRS type that the terminal 100 can transmit may be determined depending on the implementation structure of the terminal 100. Transmissible DMRS type information may be transmitted to the base station 200 using information exchanged between the terminal 100 and the base station 200, such as UE capability information.

The terminal 100 transmits an SRS so that the base station 200 can measure channel information between the terminals 100 (S810). SRS may be transmitted periodically or aperiodically.

Among the DMRS types that the terminal 100 can transmit, the base station 200 determines the channel environment between the terminal 100 and the base station 200, the demodulation delay time, the movement speed of the terminal, the DMRS type that the terminal 100 can transmit, and the base station. Considering the DMRS type that 200 can demodulate, the terminal 100 determines the DMRS type to be used for transmission (S820), and transmits the determined DMRS type information to the terminal 100 through the PDCCH or PDSCH (S830).

The terminal 100 allocates DMRS and data to resource elements of the PUSCH according to the DMRS type received from the base station 200, and transmits the DMRS and data to the base station 200 through the PUSCH (S840).

The base station 200 performs channel estimation from the received DMRS and then demodulates data using the channel estimation value (S850).

The terminal 100 transmits an SRS (S860), and the base station 200 measures and updates channel information between the base station 200 and the terminal 100 from the SRS.

The base station 200 can update the DMRS type to be transmitted by the terminal 100 using the updated channel information between the base station 200 and the terminal 100 (S870), and send the updated DMRS type information to the PDCCH or PDSCH. It is transmitted to the terminal 100 through (S880).

The terminal 100 allocates DMRS and data to resource elements of the PUSCH according to the updated DMRS type received from the base station 200, and transmits the DMRS and data to the base station 200 through the PUSCH (S890).

The base station 200 performs channel estimation from the received DMRS and then demodulates data using the channel estimation value.

Figure 9 is a diagram showing an example of configuring a data transmission device and a data reception device in block units according to an embodiment of the present invention.

In FIG. 9, T ₁ to T _m are transmission blocks required for the transmitting device, and R ₁ to R _m are receiving blocks required for the receiving device. In the receiving device, the time required for demodulation in each receiving block is t ₁ , t ₂ , … respectively. , t _m , and the total time D required for demodulation is t ₁ +t ₂ +… +t _m . The value of this time varies greatly depending on the implementation structure. As there are no strict restrictions on the delay time required for demodulation, a wide variety of base station configurations are possible.

In general, for a transmitted signal to be demodulated, it must have a reception function according to the transmission function. For example, a signal transmitted through an interleaving process in a transmitting device requires a deinterleaving process in a receiving device, and a signal transmitted through an IFFT (Inverse Fast Fourier Transform) process in a transmitting device requires an FFT (Fast Fourier Transform) in the receiving device. You have to go through a process.

Depending on the required demodulation delay, channel status, UE movement speed, etc., at least one function among the functions of blocks T ₁ to T _m required for the transmitting device may be omitted. For example, if the function of the R _m-2 block corresponding to the T ₃ block in Figure 9 is to improve PAPR, and the time required for demodulation is too long for the base station connected to the terminal to receive low-delay service, T The functions of block ₃ and the corresponding R _m-2 block can be turned off. When the functions of the T ₃ block and the corresponding R _m-2 block are turned off, the demodulation delay can be reduced by t _m-2 . In addition, if the function of the T _m-1 block and its corresponding R ₂ block is to improve performance in a terminal with a high movement speed, in cases where the movement speed is not high, such as an indoor base station, the T _m-1 block and its corresponding R ₂ block The function of the block is not very necessary. Accordingly, the functions of the T _m-1 block and the corresponding R ₂ block can be turned off, and accordingly, the demodulation delay is reduced by t ₂ . And the power consumption of the terminal is also reduced. The functions of blocks corresponding to the transmitting and receiving device may be turned off for various purposes other than those mentioned. If the functions of the T ₃ block and the corresponding R _m-2 block, and the T _m-1 block and the corresponding R ₂ block are turned off, the total time required for demodulation is Dt ₂ -t _m-2 , and R ₁ ~ R _m Compared to the case where all block functions are performed, the demodulation delay is reduced by (t ₂ +t _m-2 ).

Figure 10 is a diagram schematically showing a data transmission device in the LTE system.

Referring to FIG. 10, the data transmission device includes CRC addition, code block division, channel coding, rate matching, code block concatenation, control information and data multiplexing, channel interleaving, block coding, scrambling, modulation mapping, layer mapping, and DFT. There may be blocks (1002 to 1038) that perform the functions of conversion precoding, precoding, resource element mapping, IFFT, CP insertion, and DAC/RF.

Block 1002 adds a CRC to the transport block, which is the data to be transmitted. By adding a CRC, error detection for transport blocks can be supported. The transport block to which the CRC is added is segmented into a plurality of code blocks in block 1004, and a CRC is added to each code block. Block 1006 performs channel coding on a code block to which a CRC is added, block 1008 performs rate matching on each code block on which channel coding has been performed, and block 1010 performs rate matching. Each code block on which matching was performed is concatenated. Block coding can be performed on control information when necessary. Control information may include channel quality information including CQI and/or PMI, HARQ-ACK, and RI (Rank indication). Block 1014 blocks-codes CQI information, and block 1012 multiplexes block-coded control information and data. Then, block 1020 performs channel interleaving on the multiplexed control information and data. At this time, the block 1020 can, if necessary, perform puncturing and multiplexing of the bits in which ACK/NACK and RI information are block-coded by the blocks 1018 and 1016, respectively.

The channel interleaved bits are scrambled in block 1022 and then modulated and mapped in block 1024 using a modulation method such as QPSK, 16QAM, or 64QAM. The modulated signal is layer mapped in block 1026, and transform precoding such as DFT is performed in block 1028 to have single carrier characteristics. Then, in block 1030, precoding is performed using channel information. The precoded signal is mapped to resource elements consisting of subcarriers and symbols in block 1032, and after IFFT is performed in block 1034, CP is added in block 1036. Then, in block 1038, it is converted to DAC/RF and transmitted.

Here, the block 1020 that performs channel interleaving is necessary to improve performance at high moving speeds, and the block 1028 that performs transform precoding is necessary to improve PAPR. Therefore, the functions of the two blocks 1020 and 1028 can be turned off in consideration of the channel environment, low-latency services, and reduced power consumption of the terminal, thereby reducing demodulation delay and reducing power consumption.

FIG. 11 is a diagram schematically showing a data reception device corresponding to the data transmission device shown in FIG. 10.

Referring to FIG. 11, each block (1102 to 1136) of the data reception device performs a function corresponding to the reverse process of the function performed by each block (1002 to 1038) of the data transmission device. Description of blocks 1102 to 1136 is omitted.

The block of the data receiving device that corresponds to the block 1020 that performs channel interleaving in the data transmitting device is the block 1118 that performs channel deinterleaving, and the block that performs transform precoding in the data transmitting device corresponds to 1028. The block of the data receiving device is the block 1112 that performs IDFT. Therefore, if the functions of the two blocks 1020 and 1028 in the data transmission device are turned off, the functions of the two blocks 1118 and 1112 in the corresponding data reception device can also be turned off.

If the base station 200 can set the configuration of the transmission blocks of the terminal 100 in advance, it can demodulate the received signal using this information and, if necessary, turn off the function of at least one transmission and reception block, thereby delaying the demodulation. and power consumption can be reduced.

Figure 12 is a diagram showing a method for transmitting and receiving data between a terminal and a base station according to another embodiment of the present invention.

Referring to FIG. 12, the terminal 100 transmits configurable transmission block structure information to the base station 200 (S1200). For example, configurable transmission block structure information may include off-capable block information. The configurable transmission block structure of the terminal 100 may be determined depending on the implementation structure of the terminal 100. Configurable transmission block structure information may be transmitted to the base station 200 using information exchanged between the terminal 100 and the base station 200, such as terminal capability information.

The base station 200 determines the configurable transmission block structure of the terminal 100, requirements such as quality of service (QoS) of data, channel status between the base station 200 and the terminal 100, movement speed of the terminal 100, and The base station 200 determines the transmission and reception block structure based on the configurable reception block structure (S1210) and transmits the determined transmission and reception block structure information to the terminal 100 through the PDCCH or PDSCH (S1220). The determined transmission/reception block structure information may include transmission/reception block information whose function is turned off.

The terminal 100 configures a transmission block according to the transmission block structure information received from the base station 200, processes data according to the function of the configured transmission block, and transmits it to the base station 200 (S1230).

The base station 200 configures a reception block according to the determined reception block structure and demodulates the received data according to the function of the configured reception block (S1240).

The base station 200 can update the transmission and reception block structure according to the request of the terminal 100 or requirements such as QoS of changed data (S1250) and transmits the updated transmission and reception block structure information to the terminal through PDCCH or PDSCH. (S1260).

The terminal 100 reconfigures the transmission block according to the updated transmission block structure received from the base station 200, processes data according to the function of the reconstructed transmission block, and transmits it to the base station 200 (S1270).

The base station 200 reconfigures the received block according to the updated received block structure and demodulates the received data according to the function of the reconstructed received block (S1280).

Figure 13 is a diagram showing a data transmission device of a terminal according to an embodiment of the present invention.

Referring to FIG. 13, the data transmission device 1300 of the terminal 100 includes a processor 1310, a transceiver 1320, and a memory 1330.

The processor 1310 may be implemented to perform the functions of the terminal 100 described in FIGS. 8 and 11 in a frame structure with a short TTI. The processor 1310 determines a DMRS type that the terminal 100 can transmit among a plurality of DMRS types according to the location of the DMRS within a short TTI, transmits it to the base station 200 through the transceiver 1320, and transmits it to the base station 200. Once the DMRS type to be used by the terminal 100 is determined, the DMRS and data are mapped to resource elements according to the DMRS type. In addition, the processor 1310 determines a transmission block structure that can be configured by the terminal 100 and transmits it to the base station 200 through the transceiver 1320, and the base station 200 determines the transmission block structure to be used by the terminal 100. If so, the terminal 100 configures a transmission block according to the transmission block structure to be used and processes the data.

The transceiver 1320 is connected to the processor 1310 and transmits and receives wireless signals to and from the base station 200. The transceiver 1320 transmits DMRS type information that can be transmitted by the terminal 100 and transmission block structure information that can be configured by the terminal 100 to the base station 200 through a wireless signal, and transmits information to the base station 200 from the base station 200 to the terminal 100. Information on the DMRS type to be used and information on the transmission/reception block structure are received from the base station 200 through a wireless signal.

The memory 1330 stores instructions to be performed by the processor 1310 or loads instructions from a storage device (not shown) and temporarily stores them, and the processor 1310 stores the instructions in the memory 1330. The loaded command can be executed.

The processor 1310 and the memory 1330 are connected to each other through a bus (not shown), and an input/output interface (not shown) may also be connected to the bus. At this time, the transceiver 1320 is connected to the input/output interface, and peripheral devices such as input devices, displays, speakers, and storage devices may be connected.

Figure 14 is a diagram showing a data reception device of a base station according to an embodiment of the present invention.

Referring to FIG. 14, the data reception device 1400 of the base station 200 includes a processor 1410, a transceiver 1420, and a memory 1430.

The processor 1410 may be implemented to perform the functions of the base station 200 described in FIGS. 8 and 11 in a frame structure with a short TTI. The processor 1410 determines the channel status between the base station 200 and the terminal 100 within a short TTI, the demodulation delay time, the movement speed of the terminal 100, the DMRS type that the terminal 100 can transmit, and the demodulation of the base station 200. The terminal 100 determines the DMRS type to use for transmission by considering at least one of the possible DMRS types. In addition, the processor 1410 determines the channel status between the base station 200 and the terminal 100, the data requirements, the movement speed of the terminal 100, the configurable transmission block structure of the terminal 100, and the configurable transmission block structure of the base station 200. The transmission/reception block structure to be used by the terminal 100 and the base station 200 is determined by considering at least one of the reception block structures.

The transceiver 1420 is connected to the processor 1410 and transmits and receives wireless signals to and from the base station 200. The transceiver 1420 receives DMRS type information that the terminal 100 can transmit and transmission block structure information that can be configured by the terminal 100 from the terminal 100 through a wireless signal, and provides DMRS type information to be used by the terminal 100. and transmission/reception block structure information, etc. are transmitted to the terminal 100 through a wireless signal.

The memory 1430 stores instructions to be performed by the processor 1410 or loads instructions from a storage device (not shown) and temporarily stores them, and the processor 1410 stores instructions stored or loaded in the memory 1430. You can run .

The processor 1410 and the memory 1430 are connected to each other through a bus (not shown), and an input/output interface (not shown) may also be connected to the bus. At this time, the transceiver 1420 is connected to the input/output interface, and peripheral devices such as input devices, displays, speakers, and storage devices may be connected.

Embodiments of the present invention are not only implemented through the devices and/or methods described above, but may also be implemented through a program that implements functions corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. This implementation can be easily implemented by an expert in the technical field to which the present invention belongs based on the description of the embodiments described above.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements can be made by those skilled in the art using the basic concept of the present invention defined in the following claims. It falls within the scope of rights.

Claims (20)

A method of receiving data from a terminal at a base station,
Setting the minimum unit of time resources for transmitting data in a subframe including a plurality of subslots to a short transmission time interval (TTI) corresponding to the length of one subslot,
Determining the RS type to be used by the terminal for transmission among a plurality of RS types according to the position of the reference signal (RS) within the short TTI, and
Transmitting RS type information to be used for transmission by the terminal to the terminal
Method of receiving data including. In paragraph 1:
The determining step is to determine the RS to be used by the terminal in consideration of at least one of the channel state between the base station and the terminal, demodulation delay time, movement speed of the terminal, an RS type that the terminal can transmit, and an RS type that the base station can demodulate. A method of receiving data comprising determining a type. In paragraph 2,
Receiving SRS (Sounding RS) from the terminal, and
Estimating the channel state between the base station and the terminal from the SRS
A method of receiving data further comprising: In paragraph 2,
The determining step further includes receiving RS type information that the terminal can transmit from the terminal. In paragraph 1:
determining a transmission block structure to be applied to the terminal and a reception block structure to be applied to the base station corresponding to the transmission block structure; and
Transmitting transmission block structure information to be applied to the terminal to the terminal
A method of receiving data further comprising: In paragraph 5,
Configuring transmission blocks according to the transmission block structure and processing data according to the function of the configured transmission block, and
Mapping RS and processed data to resource elements and transmitting them according to the RS type that the terminal will use for transmission
A method of receiving data further comprising: In paragraph 5,
The step of determining the transmission block structure and the reception block structure includes the channel state between the base station and the terminal, the configurable transmission block structure and data requirements of the terminal, the movement speed of the terminal, and the reception block structure configurable by the base station. A method of receiving data comprising determining the transmission block structure and the reception block structure by considering at least one of them. In paragraph 5,
The transmission block structure information includes information on a transmission block whose function is to be turned off among configurable transmission blocks of the terminal. In paragraph 5,
Updating a transmission block structure to be applied to the terminal based on at least one of a terminal request or a data requirement and a reception block structure to be applied to the base station in response to the transmission block structure.
A method of receiving data further comprising: In paragraph 1:
Updating the RS type to be used by the terminal for transmission from the channel state between the base station and the terminal.
A method of receiving data further comprising: In paragraph 1:
The RS is a data reception method including DMRS (Demodulation RS). A method of transmitting data from a terminal,
In a subframe containing a plurality of subslots, the terminal can transmit among a plurality of RS types according to the position of the RS (reference signal) within a short TTI set to one subslot length as the minimum unit of time resources for transmitting data. Transmitting RS type information to the base station,
Receiving RS type information to be used for transmission by the terminal from the base station, and
Mapping RS and data to resource elements according to the RS type information
A data transmission method including. In paragraph 12:
Transmitting configurable transmission block information from the terminal to the base station,
Receiving transmission block information to be used by the terminal from the base station, and
Processing the data according to the function of a transmission block configured according to transmission block information to be used by the terminal.
A data transmission method further comprising: In paragraph 13:
A data transmission method in which the transmission block to be used by the terminal is determined in consideration of at least one of channel status, a configurable transmission block structure and data requirements of the terminal, a movement speed of the terminal, and a reception block structure configurable by the base station. In paragraph 12:
The RS type to be used by the terminal for transmission is data determined by the base station in consideration of at least one of the channel state, demodulation delay time, movement speed of the terminal, an RS type that the terminal can transmit, and an RS type that the base station can demodulate. How to send. In paragraph 12:
The RS is a data transmission method including DMRS (Demodulation RS). A device that receives data from a terminal at a base station,
The minimum unit of time resources for transmitting data in a subframe containing a plurality of subslots is set to a short transmission time interval (TTI) corresponding to the length of one subslot, and within the short TTI, a demodulation reference (DMRS) is set. A processor that determines the DMRS type to be used by the terminal for transmission among a plurality of DMRS types according to the location of the signal, and determines the transmission block structure to be used by the terminal, and
A transceiver that transmits DMRS type information to be used by the terminal for transmission and transmission block structure information to be used by the terminal to the terminal.
A data receiving device comprising: In paragraph 17:
The processor determines the DMRS type to be used for transmission by the terminal in consideration of at least one of the channel status between the base station and the terminal, demodulation delay time, movement speed of the terminal, a DMRS type that the terminal can transmit, and a DMRS type that the base station can demodulate. A data receiving device that makes decisions. In paragraph 17:
The processor considers at least one of the channel status between the base station and the terminal, the configurable transmission block structure and data requirements of the terminal, the movement speed of the terminal, and the reception block structure configurable by the base station to determine the transmission block to be used by the terminal. A data receiving device that determines the structure. The data receiving device of claim 17, wherein the transmission block structure information includes information on a transmission block whose function is to be turned off among configurable transmission blocks of the terminal.

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