HK40012913B - Method for transmitting/receiving data in wireless communication system, and apparatus therefor - Google Patents

Description

Method and device for transmitting and receiving data in wireless communication system

Technical Field

The present invention relates to a wireless communication system, and more particularly, to a method of transmitting and receiving data and an apparatus supporting the method.

Background Art

Mobile communication systems are typically developed to provide voice services while ensuring user mobility. These mobile communication systems have gradually expanded their coverage from voice services to data services, and ultimately to high-speed data services. However, as current mobile communication systems are constrained by resource shortages and users demand ever-higher-speed services, there is a need to develop more advanced mobile communication systems.

The requirements for next-generation mobile communication systems may include supporting massive data traffic, significantly increasing the transmission rate per user, accommodating a significant increase in the number of connected devices, very low end-to-end latency, and high energy efficiency. To this end, various technologies such as small cell enhancement, dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), support for ultra-wideband, and device networking are being studied.

Summary of the Invention

Technical issues

The present invention provides a method and device for sending and receiving data in a wireless communication system.

Regarding the method and apparatus, the present specification proposes a method for configuring bundling for a downlink shared channel (eg, PDSCH) and an apparatus thereof.

Specifically, the present specification proposes a method and apparatus for dynamically configuring a bundling size of a downlink shared channel based on downlink control information (DCI) sent by a base station.

The technical objectives to be achieved in the present invention are not limited to the above-mentioned technical objectives, and ordinary technicians in the field to which the present invention belongs can clearly understand other technical objectives not described above from the following description.

Technical Solution

On the one hand, a method for sending and receiving data by a user terminal in a wireless communication system includes: receiving downlink control information from a base station, wherein the downlink control information includes an indicator for setting a bundling size of a downlink shared channel; and receiving downlink data from the base station through a downlink shared channel configured based on the downlink control information, wherein the bundling size is set based on the value of the indicator.

In addition, the method further includes: receiving configuration information including a plurality of bundling size sets from the base station, each bundling size set having at least one candidate value of the bundling size.

In addition, in an embodiment of the present invention, when the value of the indicator is "0", a specific bundle size set having one candidate value among a plurality of bundle size sets is configured as a set for setting the bundle size. The bundle size is determined by the candidate value included in the specific bundle size set.

Furthermore, in an embodiment of the present invention, in a case where the value of the indicator is "1", a bundling size set including two candidate values among a plurality of bundling size sets is configured as a set for setting the bundling size.

Furthermore, in the embodiment of the present invention, the bundling size is set to one of two candidate values based on a comparison result between the number of physical resource blocks continuous on the frequency axis and a threshold value.

Furthermore, in an embodiment of the present invention, when the number of consecutive physical resource blocks is greater than a threshold, the bundling size is set to a larger value of two candidate values.

Furthermore, in an embodiment of the present invention, when the number of consecutive physical resource blocks is less than a threshold, the bundling size is set to a smaller value of two candidate values.

Furthermore, in the embodiment of the present invention, the threshold value is a value obtained by dividing the resource blocks used for the bandwidth of the active bandwidth part (BWP) by 2.

In addition, on the one hand, a method for sending and receiving data by a base station in a wireless communication system includes: sending downlink control information to a user equipment, wherein the downlink control information includes an indicator for setting a bundling size of a downlink shared channel; and sending downlink data to the user equipment through a downlink shared channel configured based on the downlink control information, wherein the bundling size is set based on the value of the indicator.

Furthermore, in one aspect, a user equipment for transmitting and receiving data in a wireless communication system includes: a radio frequency (RF) module configured to transmit and receive radio signals; and a processor functionally connected to the RF module. The processor is configured to: receive downlink control information from a base station, wherein the downlink control information includes an indicator for setting a bundle size for a downlink shared channel; and receive downlink data from the base station via the downlink shared channel configured based on the downlink control information. The bundle size is set based on the value of the indicator.

Beneficial effects

According to the embodiment of the present invention, there is an effect of reducing the overhead of control information and setting the bundle size.

In addition, according to the embodiments of the present invention, the bundle size can be flexibly set or indicated through a small amount of control information.

In addition, according to the embodiments of the present invention, when the scheduled bandwidth is large, it is possible to improve the performance of channel estimation by increasing the coefficients of resource blocks to which the same precoder is applied.

Effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included herein as part of the detailed description to assist in understanding the present invention, provide embodiments of the present invention and describe technical features of the present invention using the following detailed description.

FIG1 illustrates an example of the overall system structure of NR to which the method proposed in this specification can be applied.

FIG2 illustrates the relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in this specification can be applied.

FIG3 illustrates an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.

FIG4 shows an example of antenna ports and resource grids for each parameter set to which the method proposed in this specification can be applied.

FIG5 is a diagram illustrating an example of a self-contained slot structure to which the method proposed in this specification may be applied.

FIG6 shows an operation flow chart of a UE that transmits and receives data in a wireless communication system to which the method proposed in this specification can be applied.

FIG7 is a flowchart showing an operation of a base station for transmitting and receiving data in a wireless communication system to which the method proposed in this specification can be applied.

FIG8 is a block diagram illustrating a wireless communication apparatus according to an embodiment of the present invention.

FIG9 illustrates a block diagram of a communication device according to an embodiment of the present invention.

FIG. 10 is a diagram illustrating an example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

FIG. 11 is a diagram illustrating another example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

DETAILED DESCRIPTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description disclosed below with reference to the accompanying drawings is intended to describe illustrative embodiments of the present invention and is not intended to represent the only embodiment of the present invention. The following detailed description includes specific details to provide a complete understanding of the present invention. However, it should be understood by those skilled in the art that the present invention can be practiced without introducing these specific details.

In some cases, in order to avoid obscuring the concepts of the present disclosure, well-known structures and devices are omitted, or may be shown in block diagram form based on the core functions of each structure and device.

In the present disclosure, a base station has the meaning of a terminal node of a network through which the base station communicates directly with the terminal. In this document, specific operations described as being performed by a base station may be performed by an upper node of the base station as appropriate. That is, it is apparent that in a network including multiple network nodes including a base station, various operations for communicating with the terminal may be performed by a base station or other network nodes other than the base station. A base station (BS) may be replaced by another term such as a fixed station, a node B, an eNB (evolved node B), a base transceiver system (BTS), or an access point (AP), a gNB (next generation NB, general NB, g node B). In addition, a terminal may be fixed or may have mobility and may be replaced by another term such as a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), a wireless terminal (WT), a machine type communication (MTC) device, a machine to machine (M2M) device, or a device to device (D2D) device.

In the following, downlink (DL) refers to communication from a base station to a terminal, while uplink (UL) refers to communication from a terminal to a base station. In downlink transmission, the transmitter can be part of the base station, and the receiver can be part of the terminal. Similarly, in uplink transmission, the transmitter can be part of the terminal, and the receiver can be part of the base station.

Specific terms used in the following description are introduced to help understanding of the present invention, and the specific terms may be used in different ways as long as they do not depart from the technical scope of the present invention.

The techniques described below can be used for various types of wireless access systems based on code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), or non-orthogonal multiple access (NOMA). CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), or Enhanced Data Rates for GSM (EDGE). OFDMA can be implemented using radio technologies such as IEEE 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802-20, or Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, which employs OFDMA for downlink and SC-FDMA for uplink transmission. LTE-A (Advanced) is an evolved version of the 3GPP LTE system.

The embodiments of the present invention may be supported by standard documents published for at least one wireless access system, such as IEEE 802, 3GPP, and 3GPP2. In other words, the aforementioned documents provide backup for steps or parts of the embodiments of the present invention that are not described in order to clearly illustrate the technical principles of the present invention. Furthermore, all terms disclosed in this document may be described by the aforementioned standard documents.

For the purpose of clarity, 3GPP LTE/LTE-A/NR (New RAT) is mainly described, but the technical features of the present disclosure are not limited thereto.

Definition of terms

eLTE eNB: eLTE eNB is an evolution of eNB that supports connections between EPC and NGC.

gNB: A node that supports NR in addition to connectivity with NGC

New RAN: Radio access network that supports NR or E-UTRA or interacts with NGC

Network Slicing: Network slicing is a network defined by an operator to provide solutions optimized for specific market scenarios that require specific requirements and ranges between devices.

Network Function: A network function is a logical node in the network infrastructure with a well-defined external interface and well-defined functional operations.

NG-C: Control plane interface for the NG2 reference point between the New RAN and NGC

NG-U: User plane interface for the NG3 reference point between the New RAN and NGC

Non-standalone NR: A deployment configuration where the gNB requires an LTE eNB as the anchor point for the control plane connection to the EPC or an eLTE eNB as the anchor point for the control plane connection to the NGC.

Non-standalone E-UTRA: A deployment configuration where the eLTE eNB requires a gNB as the anchor point for the control plane connection to the NGC.

User Plane Gateway: Termination point of the NG-U interface

General system

FIG1 is a block diagram illustrating an example of an overall structure of a New Radio (NR) system in which the method proposed in the present disclosure may be implemented.

Referring to Figure 1, NG-RAN consists of gNBs that provide NG-RA user plane (new AS sublayer/PDCP/RLC/MAC/PHY) and control plane (RRC) protocol terminals for UE (user equipment).

gNBs are connected to each other via the Xn interface.

The gNB is also connected to the NGC via the NG interface.

More specifically, the gNB is connected to the Access and Mobility Management Function (AMF) via the n2 interface and to the User Plane Function (UPF) via the n3 interface.

NR (New RAT) parameter set and frame structure

In NR systems, multiple parameter sets can be supported. The parameter set can be defined by subcarrier spacing and CP (cyclic prefix) overhead. The spacing between multiple subcarriers can be derived by scaling the basic subcarrier spacing by an integer N (or μ). In addition, although it is assumed that very low subcarrier spacing is not used at very high subcarrier frequencies, the parameter set to be used can be selected independently of the frequency band.

In addition, in the NR system, various frame structures based on multiple parameter sets can be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM) parameter set and a frame structure that can be considered in the NR system will be described.

Table 1 defines the multiple OFDM parameter sets supported in the NR system.

【Table 1】

μ cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal 5 480 normal

Regarding the frame structure in NR systems, the size of each field in the time domain is expressed as a multiple of the time unit _Ts = 1/( _Δfmax · _Nf ). In this case, _Δfmax = 480· ¹⁰³ and _Nf = 4096, and DL and UL transmissions are configured as radio frames with a portion of _Tf = ( _ΔfmaxNf /100)· _{Ts =} 10ms. A radio frame consists of ten subframes, each with a portion of _Tsf = ( _{ΔfmaxNf /} 1000)· _Ts =1ms. In this case, there are UL frame sets and DL frame sets.

FIG2 illustrates the relationship between a UL frame and a DL frame in a wireless communication system in which the method proposed in the present disclosure may be implemented.

As shown in FIG2 , a UL frame number I from a user equipment (UE) needs to be sent before the start of a corresponding DL frame in the UE.

Regarding the parameter set μ, slots are numbered in ascending order within a subframe and in ascending order within a radio frame. A slot consists of consecutive OFDM symbols and is determined based on the parameter set and slot configuration in use. The start of a slot in a subframe is aligned in time with the start of an OFDM symbol in the same subframe.

Not all UEs are capable of transmitting and receiving simultaneously, and this means that not all OFDM symbols in a DL slot or a UL slot are available.

Table 2 shows the number of OFDM symbols per slot of the normal CP in the parameter set μ, and Table 3 shows the number of OFDM symbols per slot of the extended CP in the parameter set μ.

【Table 2】

【Table 3】

NR Physics Resources

Regarding the physical resources in the NR system, we can consider antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc.

In the following, the above-mentioned physical resources that can be considered in the NR system will be described in more detail.

First, regarding antenna ports, the antenna ports are defined so that the channel through which symbols on one antenna port are transmitted can be inferred from the channel through which symbols on the same antenna port are transmitted. When the large-scale properties of the channel through which symbols on one antenna port are received can be inferred from the channel through which symbols on the other antenna port are transmitted, the two antenna ports can be in a QC/QCL (quasi-co-located or quasi-co-located) relationship. Here, the large-scale properties may include at least one of delay spread, Doppler spread, Doppler shift, average gain, and average delay.

FIG3 illustrates an example of a resource grid supported in a wireless communication system in which the method proposed in the present disclosure may be implemented.

3 , the resource grid is composed of subcarriers in the frequency domain, and each subframe is composed of 14·2μ OFDM symbols, but the present disclosure is not limited thereto.

In NR systems, the transmitted signal is described by one or more resource grids consisting of subcarriers and OFDM symbols. Here, the above represents the maximum transmission bandwidth, and it may vary not only between parameter sets, but also between UL and DL.

In this case, as in FIG4 , one resource grid may be configured for each parameter set μ and antenna port p.

FIG4 shows an example of antenna ports and resource grids for each parameter set to which the method proposed in this specification can be applied.

Each element of the resource grid for parameter set μ and antenna port p is denoted as a resource element and can be uniquely identified by an index pair. In this document, is an index in the frequency domain and indicates the position of a symbol in a subframe. To indicate a resource element in a time slot, an index pair is used in this document,

The resource elements for parameter set μ and antenna port p correspond to complex values. When there is no risk of confusion or when a specific antenna port or parameter set is specified, the indexes p and μ can be dropped, so that the complex values can become or

In addition, a physical resource block is defined as consecutive subcarriers in the frequency domain. In the frequency domain, physical resource blocks can be numbered from 0 to . At this time, the relationship between the physical resource block number n _PRB and the resource element (k, l) can be given as in Formula 1.

[Formula 1]

In addition, regarding carrier parts, the UE can be configured to use only a subset of the resource grid to receive or transmit the carrier part. In this case, the set of resource blocks that the UE is configured to receive or transmit are numbered from 0 to in the frequency region.

Beam management

In NR, beam management is defined as follows.

Beam management: A set of L1/L2 procedures for obtaining and maintaining a set of TRPs and/or UE beams that can be used for DL and UL transmission and reception, and includes at least the following:

-Beam determination: An operation used by a TRP or UE to select its own transmit/receive beam.

-Beam measurement: An operation for a TRP or UE to measure characteristics of a received beamforming signal.

-Beam reporting: An operation in which the UE reports information of the beamformed signal based on beam measurements.

- Beam scanning: An operation of covering a spatial area using a beam that is transmitted and/or received at time intervals according to a predetermined method.

In addition, the TRP and Tx/Rx beam correspondence in UE are defined as follows.

-Maintain Tx/Rx beam correspondence in TRP when at least one of the following is met.

-TRP can determine the TRP receive beam for uplink reception based on the UE's downlink measurements of one or more Tx beams of the TRP.

-TRP can determine the TRP Tx beam used for downlink transmission based on the uplink measurement of TRP for one or more Rx beams of TRP.

- Maintain Tx/Rx beam correspondence in the UE when at least one of the following is satisfied.

-The UE may determine a UE Tx beam to use for uplink transmission based on the UE's downlink measurements for one or more Rx beams of the UE.

-The UE may determine the UE Rx beam for downlink reception based on an indication of TRP based on uplink measurements for one or more Tx beams.

-TRP supports the ability to indicate UE beam corresponding related information.

The following DL L1/L2 beam management procedures are supported within one or more TRPs.

P-1: is used to enable UE measurements for different TRP Tx beams to support the selection of TRP Tx beam/UE Rx beam.

-In case of beamforming in TRP, typically, intra/inter-TRP Tx beam scanning is included in different beam sets. For beamforming in UE, typically UE Rx beam scanning is included from a set of different beams.

P-2: UE measurements for different TRP Tx beams are used to change the inter/intra TRP Tx beam.

P-3: If the UE uses beamforming, the UE measurements for the same TRP Tx beam are used to change the UE Rx beam.

Aperiodic reporting, at least triggered by the network, is supported in P-1, P-2, and P-3 related operations.

UE measurements based on RS (at least CSI-RS) for beam management include K (the total number of beams) beams. The UE reports the measurement results of the selected N Tx beams. In this case, N is basically not a fixed number. The process based on the RS for mobility objects is not excluded. The report information includes information indicating the measurement quality of N beams and N DL transmission beams when at least N<K. Specifically, the UE can report N' CSI-RS resource indicators (CRIs) for K'>1 non-zero power (NZP) CSI-RS resources.

The following higher-layer parameters can be configured in the UE for beam management.

- Report settings for N ≥ 1, resource settings for M ≥ 1

- Establish a link between reporting settings and resource settings in the agreed CSI measurement configuration.

- CSI-RS based P-1 and P-2 are supported as resource and reporting settings.

- P-3 can be supported regardless of whether a report setting exists.

-Report settings include at least the following

- Information indicating the selected beam

-L1 measurement report

- Time domain operations (e.g., aperiodic operations, periodic operations, semi-persistent operations)

- Frequency granularity when several frequency granularities are supported

- Resource settings include at least the following

- Time domain operations (e.g., aperiodic operations, periodic operations, semi-persistent operations)

- RS type: at least NZP CSI-RS

- At least one CSI-RS resource set. Each CSI-RS resource set includes K ≥ 1 CSI-RS resources (some parameters of the K CSI-RS resources can be the same, such as port number, time domain operation, density, and period)

In addition, NR supports the following beam reporting by considering L groups, where L>1.

- Indicates the smallest group of information

-Measurement quality of N1 beam (L1 RSRP and CSI reporting support (if CSI-RS is used for CSI acquisition))

- If applicable, information indicating N1 DL transmission beams

Group-based beam reporting, such as described above, may be configured on a per-UE basis. In addition, group-based beam reporting may be turned off on a per-UE basis (eg, when L=1 or N1=1).

NR supports a mechanism whereby the UE can trigger recovery from beam failure.

When the quality of the beam pair link of the relevant control channel is low enough (e.g., compared with a threshold, or a relevant timer expires), a beam failure event occurs. When a beam obstruction occurs, a mechanism for recovering from beam failure (or obstruction) is triggered.

The network explicitly configures the UE with resources for sending UL signals for recovery purposes.Configuration of resources is supported where the base station listens from some or all directions (eg, random access zone).

The UL transmission/resource reporting beam obstruction can be at the same time instance as PRACH (resources orthogonal to PRACH resources) and at a different time instance than PRACH (configurable for the UE). The transmission of DL signals is supported so that the UE can monitor the beam to identify new potential beams.

NR supports beam management regardless of the beam-related indication. If a beam-related indication is provided, information about the UE-side beamforming/receiving process for CSI-RS based measurements can be indicated to the UE via QCL. It is expected that parameters for delay, Doppler, average gain, etc. used in LTE systems and spatial parameters for beamforming in the receive phase will be added as QCL parameters to be supported in NR. Parameters related to the angle of arrival may be included from a UE Rx beamforming perspective, and/or parameters related to the angle of departure may be included from a base station receive beamforming perspective. NR supports the use of the same or different beams in control channel and corresponding data channel transmissions.

For NR-PDCCH transmission that supports robustness to beam-pair link blocking, a UE may configure NR-PDCCH on M beam-pair links simultaneously. In this case, the maximum value of M ≥ 1 and M may depend at least on the UE capability.

The UE may be configured to monitor NR-PDCCH on different beam-pair links in different NR-PDCCH OFDM symbols. Parameters related to the UE Rx beam configuration for monitoring NR-PDCCH on multiple beam-pair links may be configured by higher layer signaling or MAC CE, and/or considered in the search space design.

At least NR supports the indication of the spatial QCL hypothesis between the DL RS antenna ports and the DL RS antenna ports for demodulating the DL control channel. Candidate signaling methods for beam indication of NR-PDCCH (i.e., the configuration method for monitoring NR-PDCCH) are MAC CE signaling, RRC signaling, DCI signaling, specification transparent and/or implicit methods, and combinations of these signaling methods.

To receive unicast DL data channels, NR supports the indication of spatial QCL assumption between the DL RS antenna port and the DMRS antenna port of the DL data channel.

Information indicating the RS antenna port is indicated by DCI (Downlink Grant). In addition, this information indicates the RS antenna port QCL with the DMRS antenna port. Different groups of DMRS antenna ports for DL data channels can be indicated as being QCL with different groups of RS antenna ports.

Hereinafter, before describing the method proposed in this specification in detail, the contents directly/indirectly related to the method proposed in this specification are briefly described below.

In next-generation communications such as 5G and New Rat (NR), as more communication devices require greater communication capacity, there is a demand for enhanced mobile broadband communications compared to existing radio access technologies (RATs).

In addition, massive machine-type communication (MTC), which provides various services at any place and any time by connecting multiple devices and objects, is also one of the important issues to be considered in next-generation communications.

Furthermore, the design or structure of a communication system taking into account services and/or UEs that are sensitive to reliability and delay is also discussed.

As mentioned above, the introduction of next-generation radio access technology (RAT) is now discussed, in which enhanced mobile broadband (eMBB) communication, massive machine-machine communication (mMTC) and ultra-reliable and low-latency communication (URLLC) are considered. In this specification, for convenience, the corresponding technology is referred to as "new RAT (NR)".

Self-contained slot structure

In order to minimize the delay of data transmission in a TDD system, in the fifth generation New RAT (NR), a self-contained slot structure such as that shown in FIG5 is considered.

That is, FIG5 is a diagram illustrating an example of a self-contained slot structure to which the method proposed in this specification can be applied.

In FIG5 , a shaded area 510 indicates a downlink (DL) control region, and a black portion 520 indicates an uplink control region.

The portion 530 without indication may be used for downlink data transmission and may be used for uplink data transmission.

This structure is characterized in that DL transmission and UL transmission are sequentially performed within one slot, and within one slot, DL data is transmitted and UL Ack/Nack can also be transmitted and received.

Such a time slot may be defined as a "self-contained time slot".

That is, through this time slot structure, the base station can reduce the time spent on performing data retransmission to the UE when a data transmission error occurs, thereby minimizing the delay of the final data delivery.

In this self-contained time slot structure, the base station and the UE need a time interval for a process from a transmission mode to a reception mode or a process from a reception mode to a transmission mode.

To this end, in a corresponding slot structure, some OFDM symbols in an instance from DL to UL are configured as a guard period (GP).

In the following specification, a method of configuring and/or indicating a physical resource block bundling size applied to a downlink shared channel (eg, a physical downlink shared channel (PDSCH)) related to transmission and reception of downlink data is specifically described below.

PRB bundling may refer to the operation of applying the same PMI across multiple consecutive resource blocks (i.e., physical resource blocks (PRBs)) when performing data transmission. In other words, PRB bundling may mean that the UE assumes multiple resource blocks in the frequency domain as one granularity for precoding in order to perform PMI reporting and/or RI reporting.

In addition, PRB bundling for the downlink shared channel may mean or refer to demodulation reference signal bundling (DMRS bundling).

In this case, the system bandwidth or bandwidth part (BWP) can be divided based on the size of the precoding resource block group (PRG) (e.g., P' or _P'BNP,i ). Each PRG can include contiguous PRBs (or consecutive PRBs). That is, the PRB bundling size described in this specification may refer to the size of the PRB or the PRG value. In addition, the value (i.e., number) indicating the PRB bundling size may refer to the number of PRBs used for the corresponding PRB bundling.

In this case, it is necessary to determine the setting of the PRB bundle size by considering the trade-off between the flexibility of the precoder used in the PRB and the quality of the channel estimation. Specifically, if the size of the PRB bundle is set to be very large, it may lead to a disadvantage in flexibility due to the necessity to use the same precoder in all PRBs. On the other hand, if the size of the PRB bundle is set to be very small, the complexity of the channel estimation may increase. Therefore, by considering the above aspects, it is necessary to efficiently perform the setting of the PRB bundle size.

Regarding the transmission of downlink data, in the NR system, the value of the PRB bundling size can be set according to a method of selecting a specific value of a preset value (e.g., 1, 2, 4, 8, 16) as the value of the PRB bundling size (hereinafter referred to as the first method) and/or a method of setting the same value as the bandwidth (or PRB) continuously scheduled (i.e., allocated) for the corresponding UE in the frequency domain as the value of the PRB bundling size (hereinafter referred to as the second method). In this case, the first method and the second method can be applied independently, or the two methods can be mixed and applied.

For example, if the PRB bundling size set is configured as {2, 4, UE allocated frequency band (e.g., wideband)}, the PRB bundling size may be selected (or determined) according to the first method as any value of 2 or 4. Alternatively, in this case, the PRB bundling size may be selected as the UE allocated frequency band according to the second method.

In this case, if the PRB bundling size set includes candidate values such as {2, 4, UE allocated band (eg, wideband)}, the PRB bundling size may be indicated by 1-bit information of the DCI field as follows.

For example, when 1 bit of the DCI field indicates a value of '1', the PRB bundling size may be determined as one or two candidate values set by RRC.

In this case, if two candidate values are set through RRC, the PRB bundling size can be implicitly determined as one value based on the scheduled bandwidth, resource block group, subband size, PDCCH resource element group bundling size, bandwidth part, DMRS pattern, etc.

When the 0th bit of the DCI field indicates a value of '0', the PRB bundling size may be set to a value set by RRC.

If resource block group (RBG)=2 is configured in the UE, the UE does not expect the value of PRG to be "4".

In a wide range of bandwidths, the set of RBG sizes may include at least 2, [3,] 4, [6,] 8, 16. Depending on the number of data symbols, the RBG size may vary.

The RBG size may be determined by the network channel bandwidth, the bandwidth for the configured bandwidth portion, network or downlink control information.

Resource allocation for uplink/downlink may be configured as in Table 4 and may be selected by RRC.

[Table 4]

Configuration 1 Configuration 2 X0– X1 RB RBG size 1 RBG size 2 X1+1–X2 RB RBG size 3 RBG size 4 … … …

RRC may select configuration 1 or configuration 2. One configuration may be configured as a default value while RRC configures the other configuration.

The configuration of uplink/downlink is independent, but the same table can be used regardless of the duration and the same RBG size can be used.

Regarding this content, in the NR system, a method of indicating the PRB bundle size by a 1-bit value is considered. In this case, as described above, when the indicator indicating the bundle size in the DCI field is "0", a value set by RRC can be set as the bundle size.

However, when the value of the indicator indicating the bundle size in the DCI field is "1", RRC has already set two values. In this case, it is necessary to consider a method of implicitly configuring the bundle size of two values.

An embodiment of the present invention proposes an implicit determination method that dynamically indicates the bundle size when the value of the indicator indicating the bundle size is "1" by considering the above description.

The following embodiments are categorized only for convenience of description, and some elements or features of any embodiment may be included in another embodiment or may be replaced with corresponding elements or features of another embodiment.

For example, the contents of the PRB bundling size set described in the first embodiment can be commonly applied to various embodiments of the specification.

In addition, for the configuration and/or indication of PRB bundling, the methods described in the first to fourth embodiments (e.g., methods for public downlink data) and the method described in the fifth embodiment (e.g., methods for broadcast downlink data) can be applied independently or in combination, and vice versa.

<Embodiment 1> When the value of the indicator indicating the bundling size is '1', the bundling size may be determined based on the number of resource blocks allocated to the UE for PDSCH transmission.

Specifically, when the number of resource blocks allocated to PDSCH transmission is greater than a reference number (eg, a specific threshold), a larger value of candidate values included in a candidate value set of a bundling size configured by RRC may be set as the bundling size.

Alternatively, the bundling size may be implicitly configured by comparing the maximum or minimum value of the number of consecutive adjacent resources among resource blocks allocated to the UE for PDSCH transmission with a reference RB value (or threshold) instead of the number of allocated resource blocks.

For example, if resource blocks allocated to the UE are (1, 2, 3), (6, 7), and (10), the maximum value of the number of consecutive adjacent resources is 3, and the minimum value thereof is 1.

In this case, the UE may compare the maximum value or the minimum value with the threshold value and may set one of the candidate values of the bundling size configured by the RRC as the bundling size based on the comparison result.

The "number of allocated resource blocks," the "maximum or minimum number of consecutive adjacent resource blocks among the allocated resource blocks," and the "reference number (or threshold)" can be set separately by the network through higher-layer RRC signaling. The base station can indicate to the UE through RRC signaling whether to set the maximum and minimum numbers of consecutive adjacent resource blocks among the allocated resource blocks as the bundling size by comparing the above values with the thresholds.

<Example 1-1>

In embodiment 1, the reference number (or threshold) for determining the bundle size may be determined based on the bandwidth of the active bandwidth portion, the active bandwidth portion size, or the bandwidth portion size.

For example, if 50 RBs are used in carrier BWP 1, when the allocated resources are equal to or greater than 10 RBs, {2, 4}, {2, scheduling bandwidth (BW)} and {4, scheduling bandwidth}, that is, the candidate value set of the bundling size configured by RRC is set (or determined) as the bundling size.

In this case, regardless of the number of RBs allocated for data transmission, the UE and the base station may assume a value of the scheduling bandwidth to be a value greater than 2 or 4 and determine the bundling size.

If 100 RBs are used in BWP 2, the threshold value may be changed differently from BWP 1. When the allocated resources are 20 RBs or more, a larger value in the candidate value set of the bundling size may be set as the bundling size.

That is, the threshold, ie, the reference RB number for determining the bundling size, may be a value obtained by dividing each of the bandwidth of the active bandwidth part, the active bandwidth part size, or the bandwidth part size by 2, as in Equation 2.

[Equation 2]

In Equation 2, the threshold value may be set to a rounded-up value, a rounded-down value, or a half-rounded-up value of a value obtained by dividing each of the bandwidth of the active bandwidth part, the active bandwidth size, or the bandwidth part size by 2.

If the bundling size is determined based on the number of allocated RBs, when the number of allocated RBs is small, a diversity effect can be obtained by performing a precoder cycle with a small bundling size.

The threshold, ie, the number of RBs as a reference, may be determined based on the system bandwidth, the bandwidth of the component carrier, or a UE-specific bandwidth.

Alternatively, if multiple active BWPs among the BWPs configured for the UE are contiguous or non-contiguous, the threshold may be determined based on the total number, minimum value, or maximum value of the BW of each active BWP when PDSCH is transmitted through one DCI configuration in multiple activated BWPs.

For example, if 10 RBs are used in active BWP 1 and 20 RBs are used in active BWP 2, the threshold may be determined based on 30 RBs (i.e., the total number of BWs), 10 RBs (i.e., the minimum value of BWs), or 20 RBs (i.e., the maximum value of BWs).

<Example 1-2>

Unlike embodiment 1-1, the threshold value can be determined based on the RBG size. For example, if the RBG size is {1, 2, 4}, when the allocated resource is 10 RBs or more, the set {2, 4}, {2, scheduling bandwidth (BW)}, and {4, scheduling bandwidth}, that is, the larger value in the set of candidate values for the bundling size, is set (or determined) as the bundling size.

However, if the RBG size is {8, 16}, when the threshold is changed and the allocated resources are therefore 20 RBs or more, the set {2, 4}, {2, scheduling bandwidth (BW)} and {4, scheduling bandwidth}, i.e., a larger value in the set of candidate values for the bundling size, may be set (or determined) as the bundling size.

If the methods described in Proposals 1-1, 1-2 are used, when the number of allocated RBs is small, a diversity effect can be obtained by performing precoder cycles with a smaller bundling size.

That is, if the bundling size of PRBs is flexibly set, the size of the bundle can be set based on the value of the indicator indicating the bundling size in the DCI field in Proposals 1 to 1-2.

In this case, the UE may obtain a candidate value set including candidate values of the bundling size from the base station through RRC signaling.

Specifically, when the value in the DCI is "0", when the UE receives the PDSCH scheduled by the same DCI, the UE can select a candidate value set including candidate values in the candidate value set, and can set the value included in the selected candidate value set as the bundle size.

When the value of the DCI is "1", when the UE receives a PDSCH scheduled by the same DCI, the UE selects a candidate value set including one or more candidate values among the candidate value sets.

If one or more values are included in the selected candidate value set, the UE may select one of two values and set the selected value as the size of the bundle.

In this case, the selection of one of the two values may be implicitly indicated to the UE.

Specifically, when the number of consecutive PRBs is greater than the above threshold, the UE may set a larger value among the values included in the candidate value set as the bundle size. If not, the UE may set a smaller value as the bundle size.

For example, if the candidate value set is {2, wideband} or {4, wideband}, the UE may set the wideband value as the bundle size when the number of consecutive PRBs is greater than the threshold, and if not, may set 2 or 4 as the bundle size.

<Proposal 2>

When the value of the indicator indicating the bundling size is '1', the bundling size may be implicitly determined based on the resource allocation type configured in the UE.

Specifically, in LTE, downlink resource allocation can be configured differently based on type. That is, the resource allocation type used for configuration of downlink resources can be defined as 0, 1, or 2.

In resource allocation type 0, resources are allocated in RBG units based on the BWP. In resource allocation type 1, a bitmap is used to notify the UE of resource allocation based on the RBs where downlink transmission occurs within a subset of the BWP, including contiguous RBGs. In resource allocation type 2, contiguous RB resources are allocated by notifying the UE of the RB number and length at which resource allocation begins. Resource allocation type 2 can be divided into localized transmission and distributed transmission.

In the case of localized transmission of resource allocation type 2, consecutive RB resources are allocated to UEs without any change. In the case of distributed transmission of resource allocation type 2, RBs are uniformly distributed to the frequency domain based on the gap size according to BWP and allocated to UEs.

In the NR downlink, centralized resource allocation of resource allocation types 0 and 2 in LTE can be supported. Distributed resource allocation of type 2 can also be supported. Therefore, the bundling size can be implicitly configured based on the resource allocation type assigned to the UE.

<Proposal 2-1>

In resource allocation type 0 described in Proposal 2, if the candidate value set of the bundling size configured by RRC is {2, 4} and {2, scheduled BW}, the bundling size is set to a smaller value when the RBG size is {1, 2}. When the RBG size is {4, 8, 16}, the bundling size is set to a larger value.

Furthermore, if the candidate value set is {4, scheduled BW}, the bundling size is set to a smaller value when the RBG size is {1, 2, 4}, and is set to a larger value when the RBG size is {8, 16}.

In this case, if the size of the consecutively allocated RBGs is large, a large number of DMRS symbols adjacent in the frequency domain can be used to obtain higher channel estimation performance.

Proposal 2-1 is a method for configuring the bundle size when the resource allocation type is "0" but is not limited thereto. Proposal 2-1 can also be applied to a method for configuring the bundle size regardless of the resource allocation type.

The active BWP can be flexibly changed through MAC signaling. The RBG of the UE (determined as the size of the active BWP) can be flexibly changed. As a result, the bundling size can be flexibly changed.

<Proposal 2-2>

If the resource allocation type is type 2 and the distributed transmission configuration is DCI, a smaller value is set as the bundle size in each of the candidate value sets {2, 4}, {2, scheduled BW}, and {4, scheduled BW}.

Distributed transmission of resource allocation type 2 is a method of allocating discontinuous RB resources uniformly distributed in the frequency domain based on BWP. Therefore, it may not make sense to set the bundle size too large because there is a high probability that the coherent frequency will be destroyed for each allocated RB.

In resource allocation type 2, if distributed transmission is configured, the UE may ignore the indicator (field value) indicating the bundling size in the DCI and may set the minimum value in the candidate value set as the bundling size or not apply bundling.

That is, the UE may cancel PRB bundling and thus apply a different precoder to each RB.

<Proposal 2-3>

If the resource allocation type is type 2 and localized transmission is configured as DCI, a larger value in each of the candidate value set {2, 4}, {2, scheduled BW} and {4, scheduled BW} configured by RRC is set as the bundle size.

In this case, as in Proposal 2-1, higher channel estimation performance can be obtained by using a large number of DMRS symbols that are contiguous in the frequency domain from consecutively allocated RBs.

Alternatively, a method of setting the bundle size using the method of Proposal 1 in the case of centralized transmission of Resource Allocation Type 2 and determining the bundle size according to the resource allocation type described in Proposal 2 in the remaining resource allocation types may be used.

<Proposal 3>

Unlike Proposal 1 and Proposal 2, if the value of the indicator related to the bundling size in the DCI is '1', the bundling size may be set based on the number of layers among multiple antenna information configured in the UE through the DCI.

For example, if the number of layers configured by DCI is 2 or less, {2, 4}, {2, scheduled BW}, and {4, scheduled BW}, i.e., a larger value in each of the candidate value sets configured by RRC, may be set as the bundling size.

If the number of layers configured by DCI is 3 or more, the smaller value in each candidate value set may be set as the bundle size.

When the SNR is fixed, increasing the number of layers means increasing the number of independent transmit and receive paths. Therefore, the total number of transmit and receive paths may also increase.

If the transmit and receive paths increase, the frequency selectivity of the transmit and receive channels may increase due to the increase in delay spread.

If the frequency selectivity of the channel is large, frequency selectivity gain can be obtained by using a smaller bundle size.

<Proposal 4>

When the value of the indicator related to the bundling size in the DCI is '1', the UE scheduled for multi-user (MU)-MIMO sets the smaller value of each of the candidate value set {2, 4}, {2, scheduled BW} and {4, scheduled BW} configured through RRC as the bundling size.

If RBs allocated to a SU and RBs allocated to MU-MIMO coexist among RBs allocated to a UE, a large bundling size may become an obstacle in applying an effective precoder to each RB.

For example, if the scheduled BW is 10 RBs, the RB allocated to MU-MIMO is 1 RB, and the RB allocated to SU is 9 RBs, when the bundling size is set to 10 RBs, that is, the scheduled BW, and the zero-forcing precoder is fully used in the BW scheduled for 1 RB allocated to MU-MIMO, unnecessary beamforming may be performed on the 9 RBs allocated to SU.

In this case, if a smaller bundling size such as 2 or 4 is set, the number of RBs on which beamforming is unnecessarily performed can be reduced.

The UE receives DMRS port information of another UE co-scheduled with MU-MIMO, or DMRS CDM group information multiplexed using the CDM method from the base station through DCI.

The UE can identify (or determine) whether the UE is scheduled via MU-MIMO through the received DCI. Therefore, the UE can use the method described in Proposal 4 to determine the bundling size.

Alternatively, the UE may determine whether to apply MU-MIMO based on a specific port of a DMRS symbol or whether to perform rate matching on a CDM group.

In addition, the UE may determine the bundling size based on whether MU-MIMO is applied and the total number of layers of the other MU paired UE or the ratio of the number of layers allocated to it to the total number of layers allocated to the other UE.

Alternatively, the UE may determine the bundling size based on whether the number of ports for which rate matching has been indicated or the number of CDM groups in the DMRS symbol is a given value (threshold) or greater (or exceeds a given value), or may determine the bundling size based on whether the ratio of the number of DMRS ports or the number of REs allocated thereto to the number of ports or the number of REs for which rate matching has been indicated is a given value or greater (or exceeds a given value).

In this case, when the value of the indicator indicating the bundle size in the DCI is 1", the bundle size may be determined by the above two or more methods.

For example, in the methods of Proposals 1 to 3, the bundle size is determined by the method of Proposal 4 in certain cases, but the method of Proposal 4 may be performed with priority over the methods of Proposal 1 to 3.

In another embodiment of the present invention, if the candidate value set includes three values, the threshold in Proposals 1-3 can be set to two values, and the bundling size can be determined. In this case, in Proposal 4, the UE scheduled by MU-MIMO can set the minimum value of the three candidate values as the bundling size.

In Proposals 1-4, in the method of determining the PRG based on the RBG size, the threshold may be determined based on the RBG size, ie, the reference RB, or the subband size (for CSI calculation) may be used instead of the RBG.

That is, the threshold, ie, the reference RB, may be determined based on the subband size, or the PRG may be determined based on the subband size.

In this case, since the candidate value of the RBG and the candidate value of the subband are different, the RBG value may be appropriately replaced with the subband value.

Both the RBG value and the subband value are determined as the BW of the active BWP. Therefore, when the RBG value is replaced with the subband value, the BW of the BWP corresponding to the RBG value can be calculated and replaced with the subband value determined based on the corresponding BW.

<Proposal 5>

If distributed transmission of resource allocation type 1 is set by scheduling DCI, consecutive virtual resource blocks (VRBs) are interleaved in units of RB pairs and allocated to the PRB region.

Thereafter, RBs are arranged at intervals of a prescribed gap size for each BW size of the active BWP within the RB pair.

If the VRBs are distributed, a pattern or an interleaving method of distributing the VRBs may be performed according to various methods.

In this case, the implicit method of determining the bundle size may be different based on the interleaved units.

First, if VRBs are interleaved in RB units, the smaller value in the candidate value set configured by RRC can be set as the bundle size. For example, if the candidate value set is {2, 4} and {2, scheduled BW}, the bundle size can be determined to be "2". If the candidate value set is {4, scheduled BW}, the bundle size can be determined to be "4".

If the number of RBs allocated to a UE increases, there is a high probability that the allocated VRBs may be contiguous in the PRB domain, even though the allocated VRBs are interleaved. Therefore, a minimum bundling size of 2 or 4 can use a larger number of DMRS symbols than when the bundling size is "1" in adjacent RBs. In this case, channel estimation performance can be improved.

If the candidate value set is {4, scheduled BW}, if "4" is selected, i.e., a smaller value is determined to be inefficient for the bundle size, the network may set the bundle size to "2" by setting the indicator (or field) indicating the bundle size in the DCI to "0".

Alternatively, in distributed resource allocation type 1 (distributed RA type 1), if VRBs are interleaved in units of RBs, the bundling size may be always set to 2.

Second, if VRBs are interleaved in RBG units, the PRG size can be set to the configured RBG size, because the PRG size of the minimum RBG unit needs to be considered to improve channel estimation performance.

Alternatively, if the number of RBGs allocated to a specific UE is large although interleaving is performed in RBG units, there is a possibility that the allocated RBGs may be contiguous.

Therefore, a threshold may be set in the number of RBGs substantially allocated to the UE based on the size of the active BWP BW or the interleaving method. When the number of allocated RBGs exceeds the threshold, the PRG size may be set as in Equation 3.

[Equation 3]

PRG size = (N × set RBG size)

In Equation 3, N may have a value of '2'.

When the number of allocated RBGs does not exceed the threshold, the PRG size may be set to the configured RBG size.

Alternatively, as in Proposal 2-1, the PRG size may be implicitly determined based on the RBG size.

In another embodiment of the present invention, as described above, if distributed resource allocation type 1 is configured by scheduling DCI and VRBs are interleaved as PRBs in RB units, when the number of RBs allocated for data transmission of a UE increases, although the corresponding RBs are interleaved by the interleaver, the probability that the RBs may actually be adjacent in the PRB domain increases.

In this case, a threshold may be set in the number of allocated RBs based on the size of the active BWP BW or the interleaving method.

If the number of allocated RBs exceeds a threshold, when the indicator (or 1-bit field) for indicating the bundling size in the DCI is '1', a smaller value in a candidate value set configured by RRC is determined as the bundling size.

However, if the number of allocated RBs does not exceed the threshold, the bundling size may be exceptionally set to '1'.

In this case, if PRG=1 is included in the candidate values, the bundle size may be set to '1'.

Alternatively, regardless of the value of the indicator (or 1-bit field) indicating the bundling size, bundling may be canceled and may not be performed (ie, PRG=1RB).

<Proposal 6>

In Proposal 1 to Proposal 6, in the candidate value sets {2, scheduled BW} and {4, scheduled BW} configured by RRC for the indicator (or 1-bit field) indicating the DCI bundle size, when the number of RBs allocated for data transmission, i.e., the scheduled BW, is less than 2 or 4, the UE and the base station can assume that the scheduled BW is less than 2 or 4 and set the bundle size using the methods of Proposal 1 to Proposal 5.

Figure 6 shows an operation flow chart of a UE that transmits and receives data in a wireless communication system to which the method proposed in this specification can be applied. Figure 6 is only for the convenience of description and does not limit the scope of the present invention.

6 , the corresponding UE may perform the method in the embodiment of this specification. In particular, the corresponding UE may support the methods described in Proposals 1 to 6. In FIG6 , detailed descriptions related to the above contents are omitted.

First, the UE may receive downlink control information (DCI) from a base station (S6010).

In this case, the DCI may include an indicator (or a 1-bit field) for indicating the bundle size as described in Proposals 1 to 6.

Thereafter, the UE may receive downlink data from the base station through a downlink shared channel configured based on the downlink control information (S6020).

In this case, the bundling size of the downlink shared channel can be set to a specific number of physical resource blocks or the size of the frequency resource region allocated to the UE. In this case, the value indicating the specific number of physical resource blocks can be included in the candidate value set previously configured for the downlink shared channel.

The candidate value sets may be obtained through RRC signaling, and each candidate value set may include the candidate values described in Recommendations 1 to 6.

The bundle size may be implicitly configured by the methods described in Recommendations 1 to 6 based on the value of an indicator or a 1-bit field.

For example, as described in Recommendation 1, when the value of the indicator or 1-bit field is "0", the bundling size may be set to a value set by RRC.

However, when the value of the indicator or 1-bit field is '1', the bundling size may be determined based on a comparison result between the number of consecutive PRBs and a threshold value.

Specifically, when the number of consecutive PRBs is greater than a threshold, a larger value among the values included in the candidate value set may be set as the bundle size. If not, the remaining values may be set as the bundle size.

In this case, the threshold value may be a value obtained by dividing the number of resource blocks of the bandwidth of the active bandwidth part (BWP) by 2 as described in Proposal 1.

As shown in Figures 8 to 11, the UE may include a processor, an RF unit, and a memory. The processor may control the RF unit to receive downlink control information (DCI) from the base station and receive downlink data from the base station through a downlink shared channel configured based on the downlink control information.

In this case, the DCI may include an indicator (or a 1-bit field) for indicating the bundle size as described in Proposals 1 to 6.

The bundling size of the downlink shared channel can be set to a specific number of physical resource blocks or the size of the frequency resource region allocated to the UE. In this case, the value indicating the specific number of physical resource blocks can be included in the candidate value set previously configured by the downlink shared channel.

The candidate value sets may be obtained through RRC signaling, and each candidate value set may include the candidate values described in Recommendations 1 to 6.

The bundle size may be implicitly configured by the methods described in Recommendations 1 to 6 based on the value of an indicator or a 1-bit field.

For example, as described in Proposal 1, when the value of the indicator or 1-bit field is '0', the bundling size may be set based on a value set by RRC.

However, when the value of the indicator or 1-bit field is '1', the bundling size may be determined based on a comparison result between the number of consecutive PRBs and a threshold value.

Specifically, when the number of consecutive PRBs is greater than a threshold, a larger value among the values included in the candidate value set may be set as the bundle size. If not, the remaining values may be set as the bundle size.

In this case, the threshold value may be a value obtained by dividing the number of resource blocks of the bandwidth of the active bandwidth part (BWP) by 2 as described in Proposal 1.

FIG7 is a flowchart showing an operation of a base station for transmitting and receiving data in a wireless communication system to which the method proposed in this specification can be applied.

FIG7 is only for the convenience of description and does not limit the scope of the present invention.

7 , the corresponding base station can execute the method described in the embodiments of this specification. In particular, the corresponding base station can support the methods described in Proposals 1 to 6. In FIG7 , detailed descriptions that overlap with the above contents are omitted.

First, the base station may transmit downlink control information (DCI) to the UE (S7010).

In this case, the DCI may include an indicator (or a 1-bit field) for indicating the bundle size as described in Proposals 1 to 6.

Thereafter, the base station may transmit downlink data to the UE through a downlink shared channel configured based on downlink control information (DCI) ( S7020 ).

In this case, the DCI may include an indicator (or a 1-bit field) for indicating the bundle size as described in Proposals 1 to 6.

The bundling size of the downlink shared channel can be set to a specific number of physical resource blocks or the size of the frequency resource region allocated to the UE. In this case, the value indicating the specific number of physical resource blocks can be included in the candidate value set previously configured for the downlink shared channel.

The candidate value sets may be obtained through RRC signaling, and each candidate value set may include the candidate values described in Proposals 1 to 6.

The bundle size may be implicitly configured by the methods described in proposals 1 to 6 based on the value of an indicator or a 1-bit field.

For example, as described in Proposal 1, when the value of the indicator or 1-bit field is '0', the bundling size may be set to a value set by RRC.

However, when the value of the indicator or 1-bit field is '1', the bundling size may be determined based on a comparison result between the number of consecutive PRBs and a threshold value.

Specifically, when the number of consecutive PRBs is greater than a threshold, a larger value among the values included in the candidate value set may be set as the bundle size. If not, the remaining values may be set as the bundle size.

In this case, the threshold value may be a value obtained by dividing the number of resource blocks of the bandwidth of the active bandwidth part (BWP) by 2 as described in Proposal 1.

The base station may include a processor, an RF unit, and a memory, as shown in Figures 8 to 11. The processor may control the RF unit to transmit downlink control information (DCI) to the UE and transmit downlink data to the UE through a downlink shared channel configured based on the downlink control information.

In this case, the DCI may include an indicator (or a 1-bit field) for indicating the bundle size as described in Proposals 1 to 6.

The bundling size of the downlink shared channel can be set to a specific number of physical resource blocks or the size of the frequency resource region allocated to the UE. In this case, the value indicating the specific number of physical resource blocks can be included in the candidate value set previously configured by the downlink shared channel.

The candidate value sets may be obtained through RRC signaling, and each candidate value set may include the candidate values described in Proposals 1 to 6.

The bundle size may be implicitly configured by the methods described in proposals 1 to 6 based on the value of an indicator or a 1-bit field.

For example, as described in Proposal 1, when the value of the indicator or 1-bit field is '0', the bundling size may be set based on a value set by RRC.

However, when the value of the indicator or 1-bit field is '1', the bundling size may be determined based on a comparison result between the number of consecutive PRBs and a threshold value.

Specifically, when the number of consecutive PRBs is greater than a threshold, a larger value among the values included in the candidate value set may be set as the bundle size. If not, the remaining values may be set as the bundle size.

In this case, the threshold value may be a value obtained by dividing the number of resource blocks of the bandwidth of the active bandwidth part (BWP) by 2 as described in Proposal 1.

General devices to which the present invention can be applied

FIG8 illustrates a block diagram of a wireless communication device according to an embodiment of the present invention.

8 , the wireless communication system includes an eNB (or network) 810 and a UE 820 .

The eNB 810 includes a processor 811 , a memory 812 , and a communication module 813 .

The processor 811 implements the functions, processes, and/or methods described in FIG1 to FIG7. The layers of the wired/wireless radio interface protocol may be implemented by the processor 811. The memory 812 is connected to the processor 811 and stores various types of information for driving the processor 811. The communication module 813 is connected to the processor 811 and transmits and/or receives wired/wireless signals.

The communication module 813 may include a radio frequency (RF) unit for transmitting and receiving radio signals.

UE 820 includes a processor 821, a memory 822, and a communication module (or RF unit) 823. Processor 821 implements the functions, processes, and/or methods described in Figures 1 to 7. The layers of the radio interface protocol may be implemented by processor 821. Memory 822 is connected to processor 821 and stores various types of information for driving processor 821. Communication module 823 is connected to processor 821 and transmits and/or receives radio signals.

The memories 812 , 822 may be located inside or outside the processors 811 , 821 and may be connected to the processors 811 , 821 in a well-known manner.

Furthermore, the eNB 810 and/or the UE 820 may have a single antenna or multiple antennas.

FIG9 illustrates a block diagram of a communication device according to an embodiment of the present invention.

In particular, FIG9 is a diagram illustrating the UE of FIG8 in more detail.

9 , the UE may include a processor (or digital signal processor (DSP) 910, an RF module (or RF unit) 935, a power management module 905, an antenna 940, a battery 955, a display 915, a keypad 920, a memory 930, a subscriber identity module (SIM) card 925 (this element is optional), a speaker 945, and a microphone 950. The UE may further include a single antenna or multiple antennas.

The processor 910 implements the functions, processes and/or methods proposed in Figures 1 to 7. The layers of the wireless interface protocol may be implemented by the processor.

The memory 930 is connected to the processor and stores information related to the operation of the processor. The memory may be located inside or outside the processor and may be connected to the processor in various well-known ways.

For example, a user inputs command information, such as a phone number, by pressing (or touching) a button on the keypad 920 or by voice activation using the microphone 950. The processor receives such command information and performs processing so that an appropriate function is executed, such as making a phone call to a phone number. Operation data may be retrieved from the SIM card 925 or memory. In addition, for convenience, the processor may recognize and display command information or driving information on the display 915.

The RF module 935 is connected to the processor and transmits and/or receives RF signals. The processor transmits command information to the RF module so that the RF module transmits a radio signal forming voice communication data, for example, to initiate communication. The RF module includes a receiver and a transmitter to receive and transmit radio signals. The antenna 940 is used to transmit and receive radio signals. When a radio signal is received, the RF module transmits the radio signal so that it is processed by the processor and converted to baseband. The processed signal can be converted into audio or readable information output through the speaker 945.

FIG. 10 is a diagram illustrating an example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

Specifically, FIG10 illustrates an example of an RF module that may be implemented in a frequency division duplex (FDD) system.

First, in the transmission path, the processor described in Figures 8 and 9 processes the data to be transmitted and provides an analog output signal to the transmitter 1010.

In transmitter 1010, the analog output signal is filtered by low-pass filter (LPF) 1011 to remove image noise caused by the digital-to-analog conversion (ADC). The signal is up-converted from baseband to RF by mixer 1012 and amplified by variable gain amplifier (VGA) 1013. The amplified signal is filtered by filter 1014, amplified by power amplifier (PA) 1015, routed by duplexer 1050/antenna switch 1060, and transmitted via antenna 1070.

In addition, in the reception path, the antenna 1070 receives a signal from the outside and provides the received signal. The signal is routed by the antenna switch 1060 / the duplexer 1050 and provided to the receiver 1020.

In receiver 1020 , the received signal is amplified by a low noise amplifier (LNA) 1023 , filtered by a bandpass filter 1024 , and down-converted from RF to baseband by a mixer 1025 .

The down-converted signal is filtered by a low-pass filter (LPF) 1026 and amplified by a VGA 1027, thereby obtaining an analog input signal. The analog input signal is provided to the processor described in FIGs.

Additionally, a local oscillator (LO) 1040 generates transmit and receive LO signals and provides them to mixer 1012 and mixer 1025, respectively.

Additionally, a phase-locked loop (PLL) 1030 receives control information from the processor to generate transmit and receive LO signals at appropriate frequencies and provides the control signals to a local oscillator 1040 .

Furthermore, the circuit shown in FIG10 may be arranged in a configuration other than that shown in FIG10.

FIG. 11 is a diagram illustrating another example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

Specifically, FIG11 shows an example of an RF module that may be implemented in a time division duplex (TDD) system.

The transmitter 1110 and the receiver 1120 of the RF module in the TDD system have the same structure as those of the transmitter and the receiver of the RF module in the FDD system.

Hereinafter, only the different structures between the RF module of the TDD system and the RF module of the FDD system will be described. For the same structures, refer to the description of FIG10 .

The signal amplified by the transmitter's power amplifier (PA) 1115 is routed through a band select switch 1150 , a band pass filter (BPF) 1160 , and an antenna switch 1170 , and is transmitted through an antenna 1180 .

In addition, in the reception path, the antenna 1180 receives a signal from the outside and provides the received signal. The signal is routed through the antenna switch 1170, the bandpass filter 1160, and the band selection switch 1150, and provided to the receiver 1120.

The above-mentioned embodiments are combinations of predetermined forms of components and features of the present invention. Unless otherwise specified, each component or function should be considered optional. Each component or feature can be implemented in a form not combined with other components or features. In addition, some components and/or features can also be combined to form embodiments of the present invention. The order of operations described in the embodiments of the present invention can be changed. Some components or features of one embodiment can be included in another embodiment, or can be replaced by corresponding components or features of another embodiment. Obviously, an embodiment can be formed by combining claims that do not have a clear reference relationship in the claims, or they can be incorporated into new claims through amendments after the application.

The embodiments of the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, the embodiments of the present invention may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) and FPGAs (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

When implemented in firmware or software, the embodiments of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the above-described functions or operations. The software code may be stored in a memory and driven by a processor. The memory may be located inside or outside the processor and may exchange data with the processor in various known ways.

It will be apparent to those skilled in the art that the present invention may be implemented in other specific forms without departing from the essential features of the present invention. Therefore, the above detailed description should not be interpreted as restrictive in all aspects, but should be considered as illustrative. The scope of the present invention should be determined by the reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included within the scope of the present invention.

Industrial Applicability

The method for sending and receiving data in a wireless communication system according to an embodiment of the present invention has been described based on an example, in which the above method is applied to a 3GPP LTE/LTE-A system and a 5G system, but in addition to the 3GPP LTE/LTE-A system and the 5G system, the above method can also be applied to various wireless communication systems.

Claims (17)

1. A method for a user terminal to receive data in a wireless communication system, the method comprising: The base station receives configuration information related to the physical resource block (PRB) bundle size of the downlink shared channel, wherein the configuration information includes: (i) a first bundle size set consisting of one of a plurality of candidate values; and (ii) a second bundle size set consisting of two of the plurality of candidate values; Receive downlink control information, including a bundle size indicator, from the base station; Based on the bundle size indicator having a first indicator value, the PRB bundle size is determined to be a value in the first bundle set; Based on the bundle size indicator having a second indicator value, and based on whether the size of the continuously scheduled PRBs in the frequency domain exceeds a threshold related to the size of the bandwidth portion (BWP) for the user terminal, the PRB bundle size is determined to be one of two values in the second bundle set; and Downlink data is received from the base station through the downlink shared channel configured based on the PRB bundle size. 2. The method according to claim 1, wherein the plurality of candidate values are equal to {2, 4, W}, where W represents the size of the continuously scheduled PRB in the frequency domain. 3. The method of claim 1, wherein the first indicator value is "0" and the second indicator value is "1". 4. The method of claim 1, wherein one of the values in the first bundle size set is equal to 4 or W, wherein W represents the size of the continuously scheduled PRB in the frequency domain. 5. The method of claim 1, wherein the two values in the second bundle size set are equal to {2, W} or {4, W}, where W represents the size of the continuously scheduled PRB in the frequency domain. 6. The method according to claim 1, wherein determining the PRB bundle size as one of the two values in the second bundle set based on whether the size of the continuously scheduled PRBs in the frequency domain exceeds the threshold comprises: Based on the fact that the size of the continuously scheduled PRB is greater than the threshold, the size of the PRB bundle is determined to be the larger of the two values in the second bundle set. 7. The method according to claim 1, wherein determining the PRB bundle size as one of the two values in the second bundle set based on whether the size of the continuously scheduled PRBs in the frequency domain exceeds the threshold comprises: Based on the fact that the size of the continuously scheduled PRB is less than the threshold, the size of the PRB bundle is determined to be the smaller of the two values in the second bundle set. 8. The method of claim 1, wherein the threshold relating to the size of the BWP for the user terminal is equal to the size of the BWP divided by 2. 9. A method for transmitting data by a base station in a wireless communication system, the method comprising: The configuration information relating to the physical resource block (PRB) bundle size of the downlink shared channel is sent to the user terminal, wherein the configuration information includes: (i) a first bundle size set consisting of one of a plurality of candidate values; and (ii) a second bundle size set consisting of two of the plurality of candidate values; Send downlink control information, including a bundle size indicator, to the user terminal; and Downlink data is sent to the user terminal through the downlink shared channel configured based on the PRB bundle size; Wherein, the bundle size indicator having a first indicator value indicates that the PRB bundle size is a value in the first bundle set, and Specifically, based on whether the size of the continuously scheduled PRB in the frequency domain exceeds a threshold related to the size of the bandwidth portion (BWP) for the user terminal, the bundle size indicator with a second indicator value indicates that the PRB bundle size is one of the two values in the second bundle set. 10. A user terminal configured to receive data in a wireless communication system, the user terminal comprising: Radio frequency (RF) module; At least one processor; and At least one computer memory, operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations including: The base station receives configuration information related to the physical resource block (PRB) bundle size of the downlink shared channel, wherein the configuration information includes: (i) a first bundle size set consisting of one of a plurality of candidate values; and (ii) a second bundle size set consisting of two of the plurality of candidate values; Receive downlink control information, including a bundle size indicator, from the base station; Based on the bundle size indicator having a first indicator value, the PRB bundle size is determined to be a value in the first bundle set; Based on the bundle size indicator having a second indicator value, and based on whether the size of the continuously scheduled PRBs in the frequency domain exceeds a threshold related to the size of the bandwidth portion (BWP) for the user terminal, the PRB bundle size is determined to be one of the two values in the second bundle set; and Downlink data is received from the base station through the downlink shared channel configured based on the PRB bundle size. 11. The user terminal according to claim 10, wherein the plurality of candidate values are equal to {2, 4, W}, where W represents the size of the continuously scheduled PRB in the frequency domain. 12. The user terminal according to claim 10, wherein the first indicator value is "0" and the second indicator value is "1". 13. The user terminal of claim 10, wherein one of the values in the first bundle size set is equal to 4 or W, wherein W represents the size of the continuously scheduled PRB in the frequency domain. 14. The terminal according to claim 10, wherein the two values in the second bundle size set are equal to {2, W} or {4, W}, wherein W represents the size of the continuously scheduled PRB in the frequency domain. 15. The user terminal according to claim 10, wherein determining the PRB bundle size as one of the two values in the second bundle set based on whether the size of the continuously scheduled PRBs in the frequency domain exceeds the threshold includes: Based on the fact that the size of the continuously scheduled PRB is greater than the threshold, the size of the PRB bundle is determined to be the larger of the two values in the second bundle set. 16. The user terminal according to claim 10, wherein determining the PRB bundle size as one of the two values in the second bundle set based on whether the size of the continuously scheduled PRBs in the frequency domain exceeds the threshold includes: Based on the fact that the size of the continuously scheduled PRB is less than the threshold, the size of the PRB bundle is determined to be the smaller of the two values in the second bundle set. 17. The user terminal of claim 10, wherein the threshold relating to the size of the BWP for the user terminal is equal to the size of the BWP divided by 2.