KR20220051798A - Method and apparatus for data transmission based on grant free in wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication technique that converges a 5G communication system for supporting a higher data rate after a 4G system with IoT technology, and a system thereof. The present disclosure provides intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. ) can be applied to The present invention discloses a method and apparatus for performing non-acknowledgment-based communication and HARQ-ACK information transmission therefor.

Description

Method and apparatus for non-approval-based data transmission in a wireless communication system

The present disclosure relates to a grant-free data transmission method in a wireless communication system. Specifically, it relates to a downlink disapproval-based data transmission method.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, the 5G communication system or the pre-5G communication system is called a 4G network after (Beyond 4G Network) communication system or an LTE system after (Post LTE) system.

In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network: cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Technology development is underway.

In addition, in the 5G system, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, in technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication), 5G communication technology is implemented by techniques such as beam forming, MIMO, and array antenna. there will be The application of cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 5G technology and IoT technology.

The 5G communication system is developing to provide various services, and as various services are provided, a method for efficiently providing these services is required. Accordingly, research on grant-free based communication is being actively conducted.

In the following disclosure, an embodiment for efficiently using radio resources and performing data transmission/reception based on non-approval will be described. In particular, a downlink disapproval-based data transmission/reception method and an uplink disapproval-based data transmission/reception method, and a method and apparatus for transmitting HARQ-ACK therefor will be described.

The present invention for solving the above problems is a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

According to the disclosed embodiment, radio resources can be efficiently used and various services can be efficiently provided to users according to priorities.

1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource domain of a 5G or NR system according to an embodiment of the present disclosure.
2 is a diagram illustrating an example of allocating data for eMBB, URLLC, and mMTC in a time-frequency resource domain in a 5G or NR system according to an embodiment of the present disclosure.
3 is a diagram for explaining a grant-free transmission/reception operation according to an embodiment of the present disclosure.
4 is a diagram illustrating a method of configuring a semi-static HARQ-ACK codebook in an NR system.
5 is a diagram illustrating a method of configuring a dynamic HARQ-ACK codebook in an NR system.
6 is a diagram illustrating a HARQ-ACK transmission process for a DL SPS.
7 is a block diagram illustrating a process in which a UE transmits semi-static HARQ-ACK codebook-based HARQ-ACK information for DCI indicating deactivation of SPS PDSCH.
8 is a block diagram illustrating a method for a UE to determine a dynamic HARQ-ACK codebook for SPS PDSCH reception.
9 is a block diagram illustrating a method of transmitting HARQ-ACK information according to a DL SPS transmission period of a UE.
10 is a block diagram illustrating simultaneous operation of a terminal for dynamically changing a DL SPS transmission period.
11 is a diagram illustrating a method of transmitting HARQ-ACK information for SPS release of a UE in a situation in which two or more DL SPSs are activated.
12 is a diagram schematically illustrating an example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to various embodiments of the present disclosure.
13 is a diagram illustrating an SPS-based groupcast data transmission/reception method according to an embodiment.
14 is a flowchart illustrating a method of operating an SPS of a terminal according to an embodiment.
15 is a flowchart illustrating a method of operating an SPS of a terminal according to an embodiment.
16 is a block diagram illustrating a structure of a terminal capable of performing an embodiment of the present disclosure.
17 is a block diagram illustrating a structure of a base station capable of performing an embodiment of the present disclosure.
18 is a diagram illustrating HARQ-ACK information reporting according to PDSCH scheduling for a specific HARQ process according to an embodiment of the present disclosure.
19 is a flowchart illustrating an operation process of a base station for performing scheduling in consideration of the same HARQ process according to an embodiment of the present disclosure.

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numerals.

Advantages and features of the present disclosure, and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the present disclosure to be complete, and those of ordinary skill in the art to which the present disclosure pertains. It is provided to fully understand the scope of the invention, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible that the instructions stored in the flow chart block(s) produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may be performed substantially simultaneously, or the blocks may sometimes be performed in the reverse order according to a corresponding function.

At this time, the term '~ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~ unit' performs certain roles do. However, '-part' is not limited to software or hardware. '~' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Accordingly, as an example, '~' indicates components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card. Also, in an embodiment, '~ unit' may include one or more processors.

A wireless communication system, for example, 3GPP's High Speed Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced ( LTE-A), 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e, such as communication standards, have developed into a broadband wireless communication system that provides high-speed and high-quality packet data services. In addition, a communication standard of 5G or NR (New Radio) is being made as a 5G wireless communication system.

In a 5G or NR system, which is a representative example of a broadband wireless communication system, an Orthogonal Frequency Division Multiplexing (OFDM) scheme is adopted in a downlink (DL) and an uplink. More specifically, a CP-OFDM (Cyclic-Prefix OFDM) scheme is employed in the downlink, and a Discrete Fourier Transform Spreading OFDM (DFT-S-OFDM) scheme is employed in the uplink along with CP-OFDM. The uplink refers to a radio link through which the terminal transmits data or control signals to the base station, and the downlink refers to a radio link through which the base station transmits data or control signals to the user equipment. In such a multiple access method, each user's data or control information is separated by allocating and operating the time-frequency resources to which data or control information is to be transmitted for each user so that they do not overlap each other, that is, orthogonality is established. can make it happen

The 5G or NR system employs a Hybrid Automatic Repeat reQuest (HARQ) method for retransmitting the corresponding data in the physical layer when a decoding failure occurs in the initial transmission. In the HARQ scheme, when the receiver fails to correctly decode (decode) data, the receiver transmits information (Negative Acknowledgment, NACK) notifying the transmitter of decoding failure so that the transmitter can retransmit the data in the physical layer. The receiver combines the data retransmitted by the transmitter with the previously unsuccessful data to improve data reception performance. In addition, when the receiver correctly decodes data, the receiver may transmit information (Acknowledgement, ACK) informing the transmitter of decoding success so that the transmitter can transmit new data.

On the other hand, a new 5G communication NR (New Radio access technology) system is designed to allow various services to be freely multiplexed in time and frequency resources, and accordingly, a reference signal such as a waveform, numerology, etc. etc. can be dynamically or freely allocated according to the needs of the corresponding service. On the other hand, in the 5G or NR system, the types of supported services can be divided into categories such as eMBB (Enhanced Mobile BroadBand), mMTC (massive machine type communications), and URLLC (Ultra-Reliable and Low-Latency Communications). eMBB is a high-speed transmission of high-capacity data, mMTC is a service that minimizes terminal power and connects multiple terminals, and URLLC is a service that aims for high reliability and low latency. Different requirements may be applied according to the type of service applied to the terminal.

In the present disclosure, each term is a term defined in consideration of each function, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the content throughout this specification. Hereinafter, the base station, as a subject performing resource allocation of the terminal, is at least one of gNode B (gNB), eNode B (eNB), Node B, BS (Base Station), radio access unit, base station controller, or a node on the network. can The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Hereinafter, an NR system will be described as an example in the present disclosure, but the present disclosure is not limited thereto, and embodiments of the present disclosure may be applied to various communication systems having a similar technical background or channel shape. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by a person having skilled technical knowledge.

In the present disclosure, the terms of a conventional physical channel and a signal may be used interchangeably with data or a control signal. For example, a Physical Downlink Shared Channel (PDSCH) is a physical channel through which data is transmitted, but in the present disclosure, the PDSCH may be referred to as data. That is, PDSCH transmission/reception may be understood as data transmission/reception.

In the present disclosure, higher signaling (or higher signal, higher layer signal, and higher layer signaling may be mixed) is from the base station to the terminal using the downlink data channel of the physical layer, or from the terminal to the uplink data channel of the physical layer It is a signal transmission method that is transmitted to the base station using

As research on a 5G communication system is progressing recently, various methods for scheduling communication with a terminal are being discussed. Accordingly, an efficient scheduling and data transmission/reception method in consideration of the characteristics of the 5G communication system is required. Accordingly, in order to provide a plurality of services to a user in a communication system, a method and an apparatus using the same are required to provide each service within the same time period according to the characteristics of the corresponding service.

The terminal must receive separate control information from the base station in order to transmit or receive data to the base station. However, in the case of periodically generated traffic or a service type requiring low delay and/or high reliability, it may be possible to transmit or receive data without the separate control information. This transmission method is referred to as a data transmission method based on a configured grant (can be mixed with a configured grant, grant-free, or configured scheduling) in the present disclosure. The method of receiving or transmitting data after receiving the data transmission resource setting and related information set through the control information is called the first signal transmission/reception type, and a method of transmitting or receiving data based on information set in advance without control information may be referred to as a second signal transmission/reception type. For the second signal transmission/reception type, preset resource regions exist periodically, and these regions are configured only with higher-order signals, such as an uplink type 1 grant (UL type 1 grant), an upper signal and an L1 signal (that is, downlink). There is an uplink type 2 grant (or semi-persistent scheduling, SPS), which is a method configured by a combination of downlink control information (DCI). In the case of the UL type 2 grant (or SPS), some information is higher-order signals, and whether or not other data is actually transmitted is determined by the L1 signal. Here, the L1 signal can be largely divided into a signal indicating activation of a resource set to a higher level and a signal indicating release (or deactivation) of the activated resource again.

In the present disclosure, when the DL SPS transmission period has an aperiodic period or is less than 1 slot, a method for determining a corresponding semi-static HARQ-ACK codebook and a dynamic HARQ-ACK codebook, and a HARQ-ACK information transmission method are included.

1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource domain of a 5G or NR system.

Referring to FIG. 1 , in a radio resource domain, a horizontal axis indicates a time domain and a vertical axis indicates a frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb OFDM symbols 122 are gathered to form one slot 126 . The length of the subframe may be defined as 1.0 ms, and the radio frame 114 may be defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may be composed of a total of N _BW subcarriers 124 . However, these specific numerical values may be variably applied depending on the system.

The basic unit of the time-frequency resource region is a resource element (RE) 112 and may be represented by an OFDM symbol index and a subcarrier index. A resource block (RB) 108 may be defined as N _RB consecutive subcarriers 110 in the frequency domain.

In general, the minimum transmission unit of data is an RB unit. In 5G or NR systems, in general, N _symb = 14, N _RB = 12, and N _BW may be proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled for the UE. In the 5G or NR system, in the case of an FDD system that divides downlink and uplink by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents an RF bandwidth corresponding to a system transmission bandwidth. Table 1 below shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system, which is the 4th generation wireless communication before the 5G or NR system. For example, an LTE system having a 10 MHz channel bandwidth has a transmission bandwidth of 50 RBs.

[Table 1]

In the 5G or NR system, a channel bandwidth wider than the channel bandwidth of LTE presented in Table 1 may be employed. Table 2 shows the correspondence between the system transmission bandwidth, the channel bandwidth, and the subcarrier spacing (SCS) in the 5G or NR system.

[Table 2]

In a 5G or NR system, scheduling information for downlink data or uplink data is transmitted from a base station to a terminal through downlink control information (DCI). DCI is defined according to various formats, and whether it is scheduling information for uplink data (UL grant) or scheduling information for downlink data (DL grant) according to each format, whether it is a compact DCI with a small size of control information , whether spatial multiplexing using multiple antennas is applied, whether DCI for power control, etc. may be indicated. For example, DCI format 1_1, which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.

- Carrier indicator: indicates which frequency carrier is transmitted.

- DCI format indicator: This is an indicator for distinguishing whether the corresponding DCI is for downlink or uplink.

- Bandwidth Part (BandWidth Part, hereinafter BWP) indicator: indicates in which BWP is transmitted.

- Frequency domain resource allocation: indicates an RB in the frequency domain allocated for data transmission. The resource to be expressed is determined according to the system bandwidth and resource allocation method.

- Time domain resource allocation (time domain resource allocation): indicates in which OFDM symbol in which slot in which data-related channel is transmitted.

- VRB-to-PRB mapping: indicates how to map a virtual RB (Virtual RB, hereinafter VRB) index and a physical RB (Physical RB, hereinafter PRB) index.

- Modulation and coding scheme (hereinafter referred to as MCS): indicates the modulation scheme and coding rate used for data transmission. That is, a coding rate value that can inform TBS (Transport Block Size) and channel coding information along with information on whether QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM can be indicated. there is.

- CBG transmission information (CodeBlock Group transmission information): indicates information on which CBG is transmitted when CBG retransmission is configured.

- HARQ process number (HARQ process number): indicates the process number of HARQ.

- New data indicator (New data indicator): indicates whether HARQ initial transmission or retransmission.

- Redundancy version: indicates a redundancy version of HARQ.

- PUCCH (Physical Uplink Control Channel) resource indicator (PUCCH resource indicator): indicates a PUCCH resource for transmitting ACK / NACK information for downlink data.

- PDSCH-to-HARQ feedback timing indicator (PDSCH-to-HARQ_feedback timing indicator): indicates a slot in which ACK/NACK information for downlink data is transmitted.

- Transmit Power Control (TPC) command for PUCCH): indicates a transmit power control command for PUCCH, which is an uplink control channel.

In the case of PUSCH transmission, time domain resource assignment may be delivered by information about a slot in which the PUSCH is transmitted, and the start OFDM symbol position S in the corresponding slot and the number of OFDM symbols L to which the PUSCH is mapped. The aforementioned S may be a relative position from the start of the slot, L may be the number of consecutive OFDM symbols, and S and L may be determined from the Start and Length Indicator Value (SLIV) defined as follows. there is.

If (L-1) ≤7 then

SLIV = 14*(L-1)+S

SLIV = 14*(L-1)+S

else

SLIV = 14*(14-L+1)+(14-1-S)

SLIV = 14*(14-L+1)+(14-1-S)

where 0 < L ≤14-S

In a 5G or NR system, a table including information on a slot in which a SLIV value, a PUSCH mapping type, and a PUSCH is transmitted may be configured in one row through RRC configuration in general. Thereafter, in the time domain resource allocation of DCI, by indicating an index value in a set table, the base station may deliver the SLIV value, the PUSCH mapping type, and information on the slot in which the PUSCH is transmitted to the terminal. This method also applies to PDSCH.

Specifically, when the base station indicates to the terminal the time resource allocation field index m included in the DCI for scheduling the PDSCH, this is DRMS Type A position information corresponding to m+1 in the table indicating the time domain resource allocation information, PDSCH mapping It informs the combination of type information, slot index K0, data resource start symbol S, and data resource allocation length L. As an example, Table 3 below is a table including PDSCH time domain resource allocation information based on normal cyclic prefix.

[Table 3]

In Table 3, dmrs-typeA-Position is a field indicating a symbol position at which DMRS is transmitted in one slot indicated by a System Information Block (SIB), which is one of the terminal common control information. Possible values for this field are 2 or 3. When the number of symbols constituting one slot is 14 in total and the first symbol index is 0, 2 means the third symbol and 3 means the fourth symbol. In Table 3, the PDSCH mapping type is information indicating the location of the DMRS in the scheduled data resource region. When the PDSCH mapping type is A, DMRS is always transmitted/received at the symbol position determined in dmrs-typeA-Position regardless of the allocated data time domain resource. When the PDSCH mapping type is B, the DMRS is always transmitted and received in the first symbol among the allocated data time domain resources. In other words, PDSCH mapping type B does not use dmrs-typeA-Position information.

In Table 1, K ₀ means an offset between a slot index to which a PDCCH through which DCI is transmitted belongs and a slot index to which a PDSCH or PUSCH scheduled in the corresponding DCI belongs. For example, when the slot index of the PDCCH is n, the slot index of the PDSCH or the PUSCH scheduled by the DCI of the PDCCH is n+K ₀ . In Table 3, S means a start symbol index of a data time domain resource within one slot. The range of possible S values is usually 0 to 13 on a Normal Cyclic Prefix basis. In Table 1, L denotes a data time domain resource interval length within one slot. Possible values of L range from 1 to 14.

In the 5G or NR system, PUSCH mapping types are defined as type A (type A) and type B (type B). In PUSCH mapping type A, the first OFDM symbol among DMRS OFDM symbols is located in the second or third OFDM symbol in the slot. In PUSCH mapping type B, the first OFDM symbol among DMRS OFDM symbols is located in the first OFDM symbol in the time domain resource allocated for PUSCH transmission. The above-described PUSCH time domain resource allocation method may be equally applicable to PDSCH time domain resource allocation.

DCI may be transmitted on a physical downlink control channel (PDCCH) (or control information, hereinafter may be used interchangeably) that is a downlink physical control channel through channel coding and modulation process. In general, DCI is independently scrambled with a specific RNTI (Radio Network Temporary Identifier, or terminal identifier) for each UE, a Cyclic Redundancy Check (CRC) is added, and after channel coding, each is configured as an independent PDCCH and transmitted. The PDCCH is mapped to a control resource set (CORESET) configured for the UE and transmitted.

Downlink data may be transmitted on a Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission. The PDSCH may be transmitted after the control channel transmission period, and scheduling information such as a specific mapping position and a modulation method in the frequency domain is determined based on DCI transmitted through the PDCCH.

Among the control information constituting DCI, through the MCS, the base station notifies the terminal of the modulation method applied to the PDSCH to be transmitted and the size of the data to be transmitted (Transport Block Size, TBS). In one embodiment, the MCS may consist of 5 bits or more or fewer bits. The TBS corresponds to the size before the channel coding for error correction is applied to the data (transport block, TB) to be transmitted by the base station.

In the present disclosure, a transport block (TB) may include a medium access control (MAC) header, a MAC CE, one or more MAC service data units (SDUs), and padding bits. Alternatively, TB may indicate a data unit or MAC Protocol Data Unit (PDU) that is transmitted from the MAC layer to the physical layer.

Modulation schemes supported by 5G or NR systems are Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), 64QAM, and 256QAM, and each modulation order (Q _m ) is 2, 4, 6, 8 corresponds to That is, in the case of QPSK modulation, 2 bits per symbol, in the case of 16QAM modulation, 4 bits per OFDM symbol, in the case of 64QAM modulation, 6 bits per symbol can be transmitted, and in the case of 256QAM modulation, 8 bits per symbol can be transmitted.

When the PDSCH is scheduled by the DCI, HARQ-ACK information indicating whether decoding for the PDSCH succeeds or fails is transmitted from the terminal to the base station through the PUCCH. This HARQ-ACK information is transmitted in the slot indicated by the PDSCH-to-HARQ feedback timing indicator included in the DCI for scheduling the PDSCH. As shown in 4, it is set by a higher layer signal. When the PDSCH-to-HARQ feedback timing indicator indicates k, the UE transmits HARQ-ACK information after k slots in slot n in which the PDSCH is transmitted, that is, in n+k slots.

[Table 4]

When the PDSCH-to-HARQ feedback timing indicator is not included in the DCI format 1_1 for scheduling the PDSCH, the UE transmits HARQ-ACK information in slot n+k according to the k value set for higher layer signaling. . When the UE transmits HARQ-ACK information on the PUCCH, it transmits to the base station using the PUCCH resource determined based on the PUCCH resource indicator included in the DCI for scheduling the PDSCH. In this case, the ID of the PUCCH resource mapped to the PUCCH resource indicator may be configured through higher layer signaling.

2 is a diagram illustrating an example of allocating data for eMBB, URLLC, and mMTC in a time-frequency resource domain in a 5G or NR system.

Referring to FIG. 2 , data for eMBB, URLLC, and mMTC may be allocated in the entire system frequency band 160 . When the eMBB data 161 and the mMTC data 169 are allocated in a specific frequency band and the URLLC data 163, 205, and 207 are generated and transmission is required, the transmitter transmits the eMBB data 161 and the mMTC data 169 ) may vacate the already allocated portion or transmit the URLLC data 163 , 205 , and 207 without transmission. Among the above-described services, since it is necessary to reduce delay time for URLLC, URLLC data may be allocated and transmitted to a part of a resource to which eMBB or mMTC data is allocated. When URLLC data is additionally allocated and transmitted in the resource to which the eMBB data is allocated, the eMBB data may not be transmitted in the overlapping time-frequency resource, and thus the transmission performance of the eMBB data may be lowered. That is, eMBB data transmission failure may occur due to URLLC allocation.

3 is a diagram illustrating a grant-free transmission/reception operation.

The terminal has a first signal transmission/reception type in which downlink data reception is performed according to information set only by an upper level signal from the base station, and a second signal transmission/reception type in which downlink data reception is performed according to transmission configuration information indicated by an upper level signal and an L1 signal. In the present disclosure, a method of operating a terminal for the second signal transmission/reception type will be mainly described. In the present disclosure, SPS, which is the second signal type for downlink data reception, means grant-free (non-acknowledgment)-based PDSCH transmission in downlink. In the DL SPS, the UE may receive non-approval-based PDSCH transmission through higher signal configuration and additional configuration information indicated by DCI.

DL SPS means Downlink Semi-persistent Scheduling, and is a method in which a base station periodically transmits/receives downlink data information to a UE based on information set as higher signaling without scheduling specific downlink control information. It can be applied in VoIP or traffic situations that occur periodically. Alternatively, although resource configuration for DL SPS is periodic, data actually generated may be aperiodic. In this case, since the terminal does not know whether actual data is generated from the periodically set resource, it may be possible to perform the following two types of operations.

- Method 3-1: For the periodically set DL SPS resource region, the UE HARQ-ACK for the uplink resource region corresponding to the resource region for the demodulation and/or decoding (hereinafter, demodulation/decoding) result of the received data sending information to the base station

- Method 3-2: For the periodically set DL SPS resource region, when at least a signal detection for DMRS or data is successfully performed, the UE corresponds to the demodulation/decoding result of the received data in an uplink corresponding to the resource region Transmitting HARQ-ACK information to the base station for the resource region

- Method 3-3: When the UE succeeds in decoding/demodulating for the periodically set DL SPS resource region (ie, ACK is generated), the uplink resource region corresponding to the corresponding resource region for the demodulation/decoding result of the received data transmits HARQ-ACK information to the base station for

In method 3-1, even if the base station does not actually transmit downlink data for the DL SPS resource region, the UE always transmits HARQ-ACK information to the uplink resource region corresponding to the DL SPS resource region. In method 3-2, since the base station does not know when to transmit data to the DL SPS resource region, it is better to transmit HARQ-ACK information in a situation where the terminal knows whether to transmit or receive data, such as when the terminal succeeds in DMRS detection or CRC detection succeeds. It may be possible. Method 3-3 transmits HARQ-ACK information to the uplink resource region corresponding to the DL SPS resource region only when the UE succeeds in data demodulation/decoding.

Among the above-described methods, it may be possible for the terminal to always support only one or support two or more. It may be possible to select one of the above methods as a 3GPP standard specification or a higher signal. For example, when method 3-1 is indicated by a higher-order signal, it may be possible for the UE to perform HARQ-ACK information for the corresponding DL SPS based on method 3-1. Alternatively, it may be possible to select one method according to DL SPS higher setting information. For example, if the transmission period is n slots or more in the DL SPS higher-order configuration information, the terminal applies method 3-1, and in the opposite case, it may be possible for the terminal to apply method 3-3. In this example, the transmission period is mentioned as an example of a criterion for selecting one method, but it may be sufficiently possible to be applied by the applied MCS table, DMRS configuration information, resource configuration information, and the like.

The UE performs downlink data reception in a downlink resource region configured for higher signaling. It may be possible to perform activation (activation) or release (release) of the downlink resource region set by the higher signaling by L1 signaling.

3 shows the operation for a DL SPS. The UE sets the next DL SPS configuration information from the higher level signal.

- Periodicity: DL SPS transmission period

- nrofHARQ-Processes: Number of HARQ processes set up for DL SPS

- n1PUCCH-AN: HARQ resource configuration information for DL SPS

- mcs-Table: MCS table setting information applied to DL SPS

In the present invention, all of the DL SPS configuration information may be configured for each Pcell or Scell, and may also be configured for each frequency band section (BWP, Bandwidth Part). In addition, it may be possible to configure one or more DL SPSs for each BWP for each specific cell.

In FIG. 3 , the UE determines the grant-free transmission/reception configuration information 300 through reception of a higher-order signal for the DL SPS. The DL SPS may be able to transmit/receive data to the resource region 308 set after receiving 302 a DCI indicating activation, and may not transmit/receive data to/from the resource region 306 before receiving the DCI. . In addition, the UE cannot receive data for the resource region 310 after receiving 304 DCI indicating release.

The UE verifies the DL SPS assignment PDCCH when both of the following two conditions are satisfied for SPS scheduling activation or release.

- Condition 1: When the CRC bit of the DCI format transmitted in the PDCCH is scrambled with the CS-RNTI set by higher signaling

- Condition 2: When the New Data Indicator (NDI) field for the activated transport block is set to 0

When some of the fields constituting the DCI format transmitted to the DL SPS assignment PDCCH are the same as those shown in [Table 5] or [Table 6], the UE says that the information in the DCI format is valid activation or effective release of the DL SPS. judge For example, when the UE detects a DCI format including the information shown in [Table 5], the UE determines that the DL SPS is activated. As another example, when the UE detects the DCI format including the information presented in [Table 6], the UE determines that the DL SPS is released.

Some of the fields constituting the DCI format transmitted to the DL SPS assignment PDCCH are [Table 5] (special field configuration information for activating DL SPS) or [Table 6] (special field configuration information for releasing DL SPS) If it is not the same as presented in , the UE determines that the DCI format is detected as a mismatched CRC.

[Table 5]

[Table 6]

When the UE receives the PDSCH without receiving the PDCCH or receives the PDCCH indicating SPS PDSCH release, it generates a corresponding HARQ-ACK information bit. In addition, at least in Rel-15 NR, the UE does not expect to transmit HARQ-ACK information(s) for reception of two or more SPS PDSCHs on one PUCCH resource. In other words, at least in Rel-15 NR, the UE includes only HARQ-ACK information for one SPS PDSCH reception in one PUCCH resource.

The DL SPS may also be configured in the P (primary) Cell and the S (secondary) Cell. Parameters that can be set for DL SPS higher level signaling are as follows.

- Periodicity: Transmission period of DL SPS

- nrofHARQ-processes: The number of HARQ processes that can be configured for DL SPS

- n1PUCCH-AN: PUCCH HARQ resource for DL SPS, the base station sets the resource to PUCCH format 0 or 1

The above-mentioned [Table 5] to [Table 6] will be possible fields in a situation where only one DL SPS can be set for each cell and for each BWP. The DCI field for activating (or releasing) each DL SPS resource in a situation in which a plurality of DL SPSs are configured for each cell and for each BWP may be different. The present disclosure provides a method for solving such a situation.

In the present disclosure, not all DCI formats described in [Table 5] and [Table 6] are used to activate or release the DL SPS resource, respectively. For example, DCI format 1_0 and DCI format 1_1 used to schedule the PDSCH may be utilized for activating a DL SPS resource. For example, DCI format 1_0 used to schedule the PDSCH may be used for releasing DL SPS resources.

4 is a diagram illustrating a method of configuring a semi-static HARQ-ACK codebook in an NR system.

In a situation where the HARQ-ACK PUCCH that the UE can transmit in one slot is limited to one, when the UE receives a semi-static HARQ-ACK codebook higher configuration, the UE receives PDSCH-to-HARQ_feedback in DCI format 1_0 or DCI format 1_1 Reports HARQ-ACK information for PDSCH reception or SPS PDSCH release in the HARQ-ACK codebook in the slot indicated by the value of the timing indicator. The UE reports the HARQ-ACK information bit value in the HARQ-ACK codebook as NACK in a slot not indicated by the PDSCH-to-HARQ_feedback timing indicator field in DCI format 1_0 or DCI format 1_1. If the UE reports only HARQ-ACK information for one SPS PDSCH release or one PDSCH reception in M _{A and C} cases for candidate PDSCH reception, the report is information indicating that the counter DAI field indicates 1 in the Pcell When scheduled by DCI format 1_0 including

Otherwise, the HARQ-ACK codebook determination method according to the method described above follows.

Assuming that the set of PDSCH reception candidate cases in the serving cell c is MA _,c , MA _,c can be obtained by the following [pseudo-code 1] steps.

[Start pseudo-code 1]

- Step 1: Initialize j to 0 and M _A,c to the empty set. Initialize k, which is the HARQ-ACK transmission timing index, to 0.

-　　　　　 Step 2: Set R as a set of rows in a table including slot information to which PDSCH is mapped, start symbol information, number of symbols, or length information. If the PDSCH-capable mapping symbol indicated by each value of R is set as the UL symbol according to the DL and UL settings set in the upper level, the corresponding row is deleted from R.

- Step 3-1: If the UE can receive one unicast PDSCH in one slot and R is not an empty set, one is added to the set M _A,c .

- Step 3-2: If the UE can receive more than one PDSCH for unicast in one slot, count the number of PDSCHs that can be assigned to different symbols in the calculated R, and add the corresponding number to MA _,c .

-　　　　　 Step 4: Start again from step 2 by increasing k by 1.

[end of pseudo-code 1]

Taking the above-described psudo-code 1 as an example of FIG. 4 , in order to perform HARQ-ACK PUCCH transmission in slot #k ( 408 ), PDSCH-to-HARQ-ACK timing that can indicate slot #k ( 408 ) All of these possible slot candidates are considered. In FIG. 4, slot#k (408) by the PDSCH-to-HARQ-ACK timing combination that is possible only for PDSCHs scheduled in slot#n (402), slot#n+1 (404) and slot#n+2 (406). It is assumed that HARQ-ACK transmission is possible. In addition, the maximum number of schedulable PDSCHs for each slot is derived in consideration of time domain resource configuration information of each schedulable PDSCH in slots 402, 404, and 406 and information indicating whether a symbol in the slot is downlink or uplink. For example, assuming that maximum scheduling is possible for two PDSCHs in slot 402, three PDSCHs in slot 404, and two PDSCHs in slot 406, the maximum number of PDSCHs included in the HARQ-ACK codebook transmitted in slot 408 is the total 7 pieces. This is called the cardinality of the HARQ-ACK codebook.

In a specific slot, the step 3-2 is described through the following [Table 7] (Default PDSCH time domain resource allocation A for normal CP).

[Table 7]

Table 7 is a time resource allocation table in which the terminal operates by default before the terminal receives time resource allocation through a separate RRC signal. For reference, in addition to separately indicating the row index value as RRC, the PDSCH time resource allocation value is determined by dmrs-TypeA-Position, which is a common RRC signal for UEs. In Table 7, the ending column and the order column are separately added values for convenience of explanation, and it may be possible that they do not actually exist. The meaning of the Ending column means an end symbol of a scheduled PDSCH, and the order column means a code position value located in a specific codebook in the semi-static HARQ-ACK codebook. The table is applied to time resource allocation applied in DCI format 1_0 of the common search region of the PDCCH.

In order for the UE to determine the HARQ-ACK codebook by calculating the maximum number of non-overlapping PDSCHs within a specific slot, the UE performs the following steps.

* Step 1: Search for the PDSCH allocation value that ends first in the slot among all the rows of the PDSCH time resource allocation table. In Table 7, it can be seen that row index 14 ends first. Mark it as 1 in the order column. And other row indices overlapping the corresponding row index 14 by at least one symbol are marked as 1x in the order column.

* Step 2: And, among the remaining row indices that are not displayed in the Order column, the PDSCH allocation value that ends first is searched for. In Table 7, a row with a row index of 7 and a dmrs-TypeA-Position value of 3 corresponds to this. And other row indices overlapping the row index by at least one symbol are indicated as 2x in the order column.

* Step 3: Repeat step 2 and increase the order value. For example, among the row indices not indicated in the order column in Table 7, the PDSCH allocation value that ends first is searched for. In Table 7, a row with a row index of 6 and a dmrs-TypeA-Position value of 3 corresponds to this. And other row indices overlapping the row index by at least one symbol are marked as 3x in the order column.

* Step 4: When order is displayed in all row indices, it ends. And the size of the corresponding order is the maximum number of PDSCHs that can be scheduled without time overlap within the corresponding slot. Scheduling without time overlap means that different PDSCHs are scheduled by TDM.

In the order column of Table 7, the maximum value of order means the HARQ-ACK codebook size of the corresponding slot, and the order value means the HARQ-ACK codebook point at which the HARQ-ACK feedback bit for the corresponding scheduled PDSCH is located. For example, row index 16 of Table 7 means that it exists at the second code position in the size 3 semi-static HARQ-ACK codebook. The terminal transmitting the HARQ-ACK feedback is [pseudo-code 1] or [pseudo-code 2] steps when the set of PDSCH reception candidate cases (occasion for candidates PDSCH receptions) in the serving cell c is M _A,c . _{A and c} can be found. M _A,c may be used to determine the number of HARQ-ACK bits to be transmitted by the UE. Specifically, the HARQ-ACK codebook may be configured using the cardinality of the M _A,c set.

As another example, considerations for determining a semi-static HARQ-ACK codebook (or type 1 HARQ-ACK codebook) may be as follows.

As another example, the pseudo-code for determining the HARQ-ACK codebook may be as follows.

[Start pseudo-code 2]

[Exit pseudo-code 2]

In pseudo-code 2, the location of the HARQ-ACK codebook containing HARQ-ACK information for DCI indicating DL SPS release is based on the location at which the DL SPS PDSCH is received. For example, if the start symbol in which the DL SPS PDSCH is transmitted starts from the 4th OFDM symbol based on the slot and has a length of 5 symbols, the location of HARQ-ACK information including the DL SPS release indicating release of the corresponding SPS is judged in the following way. It is assumed that a PDSCH having a length of 5 symbols starting from the 4th OFDM symbol of the slot in which the DL SPS release is transmitted is mapped, and the location of the HARQ-ACK information corresponding thereto is located in the PDSCH included in the control information indicating the DL SPS release. It is determined through the -to-HARQ-ACK timing indicator and the PUCCH resource indicator. As another example, when the start symbol in which the DL SPS PDSCH is transmitted starts from the 4th OFDM symbol based on the slot and has a length of 5 symbols, the HARQ-ACK information including the DL SPS release indicating release of the corresponding SPS. The position is determined in the following way. It is assumed that the PDSCH having a length of 5 symbols starting from the 4th OFDM symbol of the slot indicated by the TDRA (Time domain resource allocation) of DCI, which is a DL SPS release, is mapped, and the location of the corresponding HARQ-ACK information is located in the DL SPS It is determined through the PDSCH-to-HARQ-ACK timing indicator and the PUCCH resource indicator included in the control information indicating release.

5 is a diagram illustrating a method of configuring a dynamic HARQ-ACK codebook in an NR system.

The terminal corresponds to the PDSCH-to-HARQ_feedback timing value for PUCCH transmission of HARQ-ACK information in slot n for PDSCH reception or SPS PDSCH release and based on K0, which is transmission slot location information of PDSCH scheduled in DCI format 1_0 or 1_1 In slot n, HARQ-ACK information transmitted within one PUCCH is transmitted. Specifically, for transmitting the above-described HARQ-ACK information, the UE is based on the DAI included in the DCI indicating the PDSCH or SPS PDSCH release, and the HARQ-ACK codebook of the PUCCH transmitted in the slot determined by the PDSCH-to-HARQ_feedback timing and K0. to decide

The DAI is composed of Counter DAI and Total DAI. Counter DAI is information indicating the location of HARQ-ACK information corresponding to the PDSCH scheduled in DCI format 1_0 or DCI format 1_1 in the HARQ-ACK codebook. Specifically, the value of counter DAI in DCI format 1_0 or 1_1 informs the cumulative value of PDSCH reception or SPS PDSCH release scheduled by DCI format 1_0 or DCI format 1_1 in a specific cell c. The above-described cumulative value is set based on the PDCCH monitoring occasion and the serving cell in which the scheduled DCI exists.

Total DAI is a value indicating the size of the HARQ-ACK codebook. Specifically, the value of Total DAI means the total number of previously scheduled PDSCH or SPS PDSCH releases including a time point at which DCI is scheduled. And Total DAI is a parameter used when the HARQ-ACK information in the serving cell c also includes HARQ-ACK information for the PDSCH scheduled in another cell including the serving cell c in a CA (Carrier Aggregation) situation. In other words, there is no Total DAI parameter in a system operating with one cell.

An example of the operation of the DAI is shown in FIG. 5 . In FIG. 5, when the terminal transmits the HARQ-ACK codebook selected based on the DAI to the PUCCH 520 in the nth slot of carrier 0 502 in a situation in which two carriers are configured, PDCCH monitoring configured for each carrier It shows the change in the values of Counter DAI (C-DAI) and Total DAI (T-DAI) indicated by DCI searched for each occasion. First, in the DCI searched for at m=0 (506), C-DAI and T-DAI indicate a value 512 of 1, respectively. The DCI found at m=1 (508) indicates a value 514 in which C-DAI and T-DAI are 2, respectively. In the DCI searched for in carrier 0 (c=0, 502) of m=2 (510), C-DAI indicates a value of 3 (516). In the DCI searched for in carrier 1 (c=1, 504) of m=2 (510), C-DAI indicates a value of 4 (518). At this time, when carriers 0 and 1 are scheduled on the same monitoring occasion, T-DAI is all indicated as 4.

4 and 5, the HARQ-ACK codebook determination is performed in a situation in which only one PUCCH containing HARQ-ACK information is transmitted in one slot. This is called mode 1. As an example of a method in which one PUCCH transmission resource is determined within one slot, when PDSCHs scheduled in different DCIs are multiplexed into one HARQ-ACK codebook in the same slot and transmitted, the PUCCH resource selected for HARQ-ACK transmission is finally determined as the PUCCH resource indicated by the PUCCH resource indicator field indicated in the DCI that scheduled the PDSCH. That is, the PUCCH resource indicated by the PUCCH resource indicator field indicated in the DCI scheduled before the DCI is ignored.

The following description defines a method and apparatus for determining a HARQ-ACK codebook in a situation in which two or more PUCCHs containing HARQ-ACK information can be transmitted in one slot. This is called mode 2. The UE may be capable of operating only mode 1 (transmitting only one HARQ-ACK PUCCH in one slot) or mode 2 (transmitting one or more HARQ-ACK PUCCHs in one slot). Alternatively, a terminal supporting both mode 1 and mode 2 sets the base station to operate in only one mode by higher signaling, or mode 1 and mode 2 are implicitly determined by DCI format, RNTI, DCI specific field value, scrambling, etc. it may be possible For example, a PDSCH scheduled in DCI format A and HARQ-ACK information associated therewith are based on mode 1, and a PDSCH scheduled in DCI format B and HARQ-ACK information associated therewith are based on mode 2.

Whether the above-described HARQ-ACK codebook is semi-static in FIG. 4 or dynamic in FIG. 5 is determined by the RRC signal.

6 is a diagram illustrating a HARQ-ACK transmission process for a DL SPS.

In FIG. 6 , 600 shows a situation in which the maximum receivable PDSCHs 602 , 604 , and 606 are mapped without overlapping from the viewpoint of time resources in slot k. For example, if the PDSCH-to-HARQ feedback timing indicator is not included in the DCI format for scheduling the PDSCH, the UE transmits HARQ-ACK information in slot k+1 according to the l value set for higher layer signaling. HARQ-ACK information (608) is sent. Accordingly, the size of the semi-static HARQ-ACK codebook of slot k+1 is equal to the maximum number of transmittable PDSCHs in slot k, and will be 3. In addition, when HARQ-ACK information is 1 bit for each PDSCH, the HARQ-ACK codebooks of 600 to 608 of FIG. 6 will consist of a total of 3 bits of [X, Y, Z], and X is HARQ- for PDSCH 602 ACK information, Y will be HARQ-ACK information for PDSCH 604, and Z will be HARQ-ACK information for PDSCH 606. If PDSCH reception is successful, the corresponding information will be mapped to ACK, otherwise it will be mapped to NACK. In addition, when the actual DCI does not schedule the corresponding PDSCH, the UE reports NACK. Specifically, the HARQ-ACK codebook position (which can be understood as the position of the HARQ-ACK bit in the HARQ-ACK codebook hereinafter) located according to the SLIV of the PDSCH that can be scheduled in DCI may vary, and Table 7 or It may be determined by [pseudo code 1] or [pseudo code 2].

610 of FIG. 6 shows HARQ-ACK transmission in a situation in which DL SPS is activated. In Rel-15 NR, the minimum period of the DL SPS is 10 ms, and in 610, since the length of one slot is 1 ms in the 15 kHz subcarrier interval, the SPS PDSCH 612 is transmitted in the slot n, and thereafter, the SPS PDSCH 616 in the slot n + 10 ) will be sent.

The HARQ-ACK information for each SPS PDSCH is an upper signal, and after the period for the SPS, HARQ-ACK transmission resource information, MCS table setting, and the number of HARQ processes are informed, the information contained in the DCI format indicating activation of the corresponding SPS. Accordingly, the frequency resource, time resource, MCS value, etc. are informed. For reference, a PUCCH resource through which HARQ-ACK information is transmitted may also be set as a higher signal, and the PUCCH resource has the following properties.

- Hopping

- PUCCH format (start symbol, symbol length, etc.)

Here, the MCS table setting and HARQ-ACK transmission resource information may not exist. When HARQ-ACK transmission resource information is present, Rel-15 NR supports PUCCH format 0 or 1 that can transmit up to 2 bits. However, in a later release, PUCCH format 2, 3 or 4 of 2 bits or more can be sufficiently supported.

Since HARQ-ACK transmission resource information is included in the DL SPS upper signal configuration, the UE may be able to ignore the PUCCH resource indicator in the DCI format indicating DL SPS activation. Alternatively, there may be no PUCCH resource indicator field itself in the corresponding DCI format. On the other hand, when there is no HARQ-ACK transmission resource information in the DL SPS upper signal configuration, the UE transmits HARQ-ACK information corresponding to the DL SPS to the PUCCH resource determined in the PUCCH resource indicator of the DCI format for activating the DL SPS. In addition, the difference between the slot in which the SPS PDSCH is transmitted and the slot in which the corresponding HARQ-ACK information is transmitted is determined by the value indicated by the PDSCH to HARQ-ACK feedback timing indicator of the format of the DCI that activates the DL SPS or the indicator is If not, it follows the specific value set as the upper signal in advance. For example, as in 610 of FIG. 6 , if the PDSCH to HARQ-ACK feedback timing indicator is 2, HARQ-ACK information for the SPS PDSCH 612 transmitted in the slot n is the PUCCH 614 of the slot n + 2 ) is transmitted through In addition, the PUCCH through which the corresponding HARQ-ACK information is transmitted may be set as a higher level signal or the corresponding resource may be determined by the L1 signal indicating DL SPS activation. And, the location of the HARQ-ACK codebook for the SPS PDSCH 612 transmitted to the PUCCH 614 is that if up to three PDSCHs are receivable like 600 in FIG. 6 and the time resource of the PDSCH 612 is the same as the PDSCH 604. In the case of [X Y Z], it is located at the Y-th position.

If a DCI indicating DL SPS release is transmitted, the UE needs to transmit HARQ-ACK information for the DCI to the base station. However, in the case of a semi-static HARQ-ACK codebook, the size of the HARQ-ACK codebook and its position are, as described above in this disclosure, between the time resource region to which the PDSCH is allocated and the PDSCH and HARQ-ACK indicated by the L1 signal or the upper signal. It is determined by the slot interval (PDSCH to HARQ-ACK feedback timing). Therefore, when transmitting HARQ-ACK for DCI indicating DL SPS release using a semi-static HARQ-ACK codebook, a specific rule is required rather than arbitrarily determining a location in the HARQ-ACK codebook, and in Rel-15 NR, DL SPS release is The location of the HARQ-ACK information for the indicated DCI is mapped identically to the transmission resource region of the corresponding DL SPS PDSCH.

As an example, 620 of FIG. 6 shows a situation in which a DCI 622 indicating release of an activated DL SPS PDSCH is transmitted in slot n. When the PDSCH to HARQ-ACK feedback timing indicator included in the DCI 622 format indicates 2, HARQ-ACK information for the DCI 622 will be transmitted to the PUCCH 623 of slot n + 2, The location of the HARQ-ACK codebook is as if it is assumed that the preset SPS PDSCH is scheduled in slot n, and HARQ-ACK information for the DCI 622 indicating release of the DL SPS at the HARQ-ACK codebook location corresponding to the assumed SPS PDSCH. is mapped and transmitted by the terminal. In this regard, the following two methods are possible, and the base station and the terminal will transmit/receive the corresponding DCI in at least one method according to the standard or the base station setting.

* Method 6-1-1: DCI transmission indicating release of DL SPS only in the slot in which the preset SPS PDSCH is to be transmitted

For example, as in 620 of FIG. 6 , if the SPS PDSCH is configured to be transmitted in the slot n, the UE transmits the DCI 622 indicating release of the SPS PDSCH only in the slot n, and the HARQ-ACK information for this is transmitted. Assuming that the SPS PDSCH is transmitted, it is the same as the determined slot position. In other words, when the slot in which the HARQ-ACK information for the SPS PDSCH is transmitted is n+2, the slot in which the HARQ-ACK information for the DCI indicating release of the DL SPS PDSCH is also transmitted is also n+2.

* Method 6-1-2: DCI transmission indicating release of DL SPS in any slot regardless of the slot in which the SPS PDSCH is transmitted

For example, as in 620 of FIG. 6 , when the SPS PDSCH is transmitted in slots n, n+10, n+20, ..., the base station transmits the DCI 624 indicating release of the corresponding DL SPS PDSCH to the slot n When transmitted in +3 and the value indicated in the PDSCH to HARQ-ACK feedback timing indicator included in the DCI is 1 or if there is no corresponding field, if the value preset as the upper signal is 1, DL SPS PDSCH release is indicated HARQ-ACK information 626 for DCI is transmitted and received in slot n+4.

Also, there may be a case in which the minimum period of the DL SPS is shorter than 10 ms. For example, if there is data that requires high reliability and low latency wirelessly from different devices in the factory, and the data transmission period is constant and the period itself is short, the transmission period is longer than the current minimum period of 10ms. should be shortened Accordingly, the DL SPS transmission period may be determined in units of slots, symbols, or symbol groups regardless of subcarrier intervals other than ms. For reference, the minimum transmission period of the uplink configured grant PUSCH resource is 2 symbols.

630 of FIG. 6 shows a situation in which the transmission period of the DL SPS is 7 symbols smaller than the slot. Since the transmission period is within one slot, a maximum of two SPS PDSCHs 632 and 634 may be transmitted in slot k. And the HARQ-ACK information corresponding to the SPS PDSCH 632 and the SPS PDSCH 634 is a value indicated by the PDSCH to HARQ-ACK feedback timing indicator included in the DCI indicating SPS activation or if there is no corresponding field, prior It is transmitted in a slot according to a value set as a higher signal, for example, when the corresponding value is i, the terminal HARQ-ACK information 636 for the SPS PDSCH 632 and the SPS PDSCH 634 in the slot k + i (636) to send

The location of the HARQ-ACK information in the HARQ-ACK codebook should consider the transmission period as well as the TDRA, which is the time resource information for which the SPS PDSCH is scheduled. In the past, since only one SPS PDSCH could be transmitted per slot, the HARQ-ACK codebook position was determined based on TDRA, which is time resource information, without considering the transmission period. However, if the DL SPS transmission period is smaller than the slot, the HARQ-ACK codebook position In order to determine it, TDRA, which is time resource information, and a transmission period should be considered together. Here, TDRA is Time Domain Resource Allocation, and includes transmission start symbol and length information of the SPS PDSCH. As an example, when the start symbol of the DL SPS PDSCH determined by TDRA is 2 and the length is 3, for which the DL SPS transmission period is 7 symbols, two DL SPS PDSCHs will exist in one slot as shown in 630 of FIG. 6 . That is, the first SPS PDSCH 632 is a PDSCH having OFDM symbol indices 2, 3, and 4 determined in TDRA, and the second SPS PDSCH 634 is OFDM symbol indexes 9, 10, It is a PDSCH with 11. That is, the second SPS PDSCH in the slot has the same length as the first SPS PDSCH, but the offset is shifted by the transmission period. In summary, for quasi-static HARQ-ACK codebook generation or determination, the UE uses time resource allocation information when the SPS PDSCH transmission period is greater than 1 slot to determine the HARQ-ACK codebook position for the SPS PDSCH in one slot. , when the SPS PDSCH transmission period is less than 1 slot, time resource allocation information and the SPS PDSCH transmission period are considered together.

When the SPS PDSCH transmission period is less than 1 slot, a case in which the SPS PDSCH spans a slot boundary may occur according to a combination of the transmission period and TDRA. 650 of FIG. 6 shows a corresponding example. In this case, the base station sets one SPS PDSCH crossing the slot boundary into a PDSCH 652 and a PDSCH 654 for repeated transmission. In this case, the PDSCH 652 and the PDSCH 654 may always have the same length or different lengths. In addition, only one HARQ-ACK information 656 for the SPS PDSCH composed of the PDSCH 652 and the PDSCH 654 is transmitted by the UE, and the corresponding reference slot is the last repeatedly transmitted PDSCH 654 transmitted Slot k Based on +1.

[Example 6-1: Semi-static HARQ-ACK codebook mapping method for DCI indicating DL SPS release]

When the transmission period of the SPS PDSCH becomes smaller than 1 slot, when the UE transmits HARQ-ACK information for DCI requesting release of the corresponding SPS PDSCH based on the semi-static HARQ-ACK codebook, the UE uses the following method HARQ-ACK codebook for the corresponding DCI is mapped by at least one of them.

* Method 6-2-1: The position in the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is located first from the viewpoint of time resources among SPS PDSCHs received within one slot. Same as location on HARQ-ACK codebook for SPS PDSCH

- When the number of SPS PDSCHs in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted is two or more, the terminal is located in the semi-static HARQ-ACK codebook for the HARQ-ACK information of the first SPS PDSCH in time, the HARQ for the DCI - ACK information is mapped and transmitted.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If it is assumed that two SPS PDSCHs exist at positions {2} and {3}, respectively, HARQ-ACK information indicating release of the DL SPS PDSCH is HARQ-ACK corresponding to positions {2}, {3} It is mapped to position {2} among positions on the HARQ-ACK codebook of information.

* Method 6-2-2: The location of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating the release of SPS PDSCH is the SPS PDSCH located later among the SPS PDSCHs received in one slot in terms of time resources. Same as the location of the HARQ-ACK codebook for

- When the number of SPS PDSCHs in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted is two or more, the terminal is located in the semi-static HARQ-ACK codebook for HARQ-ACK information of the temporally last SPS PDSCH, the HARQ for the DCI - ACK information is mapped and transmitted.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If it is assumed that two SPS PDSCHs exist at positions {2} and {3}, respectively, HARQ-ACK information indicating release of the DL SPS PDSCH is HARQ-ACK corresponding to positions {2} and {3} It is mapped to position {3} among positions on the HARQ-ACK codebook of information.

* Method 6-2-3: The position of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is the positions of all HARQ-ACK codebooks for SPS PDSCHs received within one slot. same

- If the number of SPS PDSCHs in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted is two or more, the terminal is located in the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of all SPS PDSCHs, the HARQ-ACK information for the corresponding DCI is repeatedly mapped and transmitted.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If it is assumed that two SPS PDSCHs exist at positions {2} and {3}, respectively, HARQ-ACK information indicating release of the DL SPS PDSCH is repeatedly mapped to positions {2} and {3}. That is, the same HARQ-ACK information is mapped to positions {2} and {3}.

* Method 6-2-4: The location of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is among multiple HARQ-ACK codebook candidate positions for SPS PDSCHs received within one slot. Selection based on the upper level signal or L1 signal set by the base station or a combination thereof

- When the number of SPS PDSCHs in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted is two or more, the base station among the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of the SPS PDSCHs uses an upper signal or an L1 signal or a combination thereof. One location is selected, and the terminal maps and transmits HARQ-ACK information for the corresponding DCI at the selected location.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. If it is assumed that two SPS PDSCHs exist at positions {2} and {3}, respectively, the base station selects {2} using DCI indicating release of the DL SPS PDSCH, and the terminal selects the DL SPS PDSCH HARQ-ACK information indicating release is mapped to position {2} and transmitted. As a DCI field for determining the semi-static HARQ-ACK codebook position, a time resource allocation field, a HARQ process number, or a PDSCH-to-HARQ feedback timing indicator may be utilized. For example, the time resource allocation field in the DCI indicating the release of the SPS PDSCH indicates time resource information of one SPS PDSCH among SPS PDSCHs that can be transmitted in the corresponding slot, and the terminal indicates the level corresponding to the indicated SPS PDSCH. HARQ-ACK information of the corresponding DCI may be transmitted to the static HARQ-ACK codebook position.

* Method 6-2-5: The location of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is indicated or configured by the base station by the upper signal or L1 signal or a combination thereof

- When the maximum number of receivable PDSCHs without time overlap is two or more in the slot in which the DCI indicating the release of the SPS PDSCH is transmitted, among the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of the corresponding PDSCHs, the base station is an upper signal or L1 A location is selected by a signal or a combination thereof, and the terminal maps and transmits HARQ-ACK information for the corresponding DCI at the selected location.

- The set of quasi-static HARQ-ACK codebook positions that the base station can select by method 6-2-4 consists of quasi-static HARQ-ACK codebook positions to which HARQ-ACK information of the SPS PDSCH can be mapped, Method 6- The set of quasi-static HARQ-ACK codebook positions that the base station can select by 2-5 consists of quasi-static HARQ-ACK codebook positions to which HARQ-ACK information of all PDSCHs can be mapped. For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating the release of the SPS PDSCH is to be transmitted is 4, if the two SPS PDSCHs are located at {2} and {3} positions, respectively If it is assumed that, according to method 6-2-4, candidate positions where HARQ-ACK for DCI indicating SPS PDSCH release can be transmitted are {2}, {3}, and according to method 6-2-5 {1}, {2}, {3}, {4}.

- For example, if the maximum number of transmit/receive PDSCHs without simultaneous PDSCH reception including the SPS PDSCH in the slot in which the DCI indicating release of the SPS PDSCH is to be transmitted is 4, the HARQ-ACK codebook size for the slot is 4, {1 , 2, 3, 4}, HARQ-ACK information for SPS PDSCH or PDSCH reception will be mapped to each position. The base station selects {1} using the DCI indicating release of the DL SPS PDSCH, and the terminal maps HARQ-ACK information instructing the release of the DL SPS PDSCH to position {1} and transmits. As a DCI field for determining the semi-static HARQ-ACK codebook position, a time resource allocation field, a HARQ process number, or a PDSCH-to-HARQ feedback timing indicator may be utilized. For example, the time resource allocation field in DCI indicating the release of the SPS PDSCH indicates time resource information of one PDSCH among PDSCHs that can be transmitted in the corresponding slot, and the UE indicates a semi-static HARQ-ACK corresponding to the indicated PDSCH. Transmits HARQ-ACK information of the corresponding DCI to the codebook location.

The above-described methods may be possible in a situation in which only one HARQ-ACK transmission is supported in one slot. When the code block group (CBG)-based transmission is set to a higher level through the DL SPS PDSCH, the UE repeats the HARQ-ACK information for the DCI indicating release of the DL SPS PDSCH by the number of CBGs by repeating at least one of the above methods. It can be transmitted by mapping to a semi-static HARQ-ACK codebook resource determined by one. Although the above-described method has been described as a method of transmitting HARQ-ACK information for DL SPS PDSCH indicating release of one SPS PDSCH transmission/reception, simultaneous release of two or more activated PDSCH transmission/reception in one cell or/and one BWP is indicated It can also be applied to a method of transmitting HARQ-ACK information for a DL SPS PDSCH. As an example, when DCI indicating release of one DL SPS PDSCH is related to a plurality of SPS PDSCHs activated in one cell or / and one BWP, SPS PDSCHs considered for HARQ-ACK codebook positioning are one SPS configuration It may be SPS PDSCHs belonging to or belonging to all configurations. At this time, if the SPS PDSCHs considered in the one SPS configuration belong to the one SPS configuration, the one SPS configuration is the SPS configuration having the lowest SPS PDSCH configuration number (or SPS index, SPS configuration identifier) or the first activated SPS It could be a setting. This is only an example, and other similar methods may be sufficiently possible.

[Example 6-2: Dynamic HARQ-ACK codebook mapping method for multiple SPS PDSCHs transmitted in one slot]

In the dynamic HARQ-ACK codebook (or Type 2 HARQ-ACK codebook), the location of corresponding HARQ-ACK information is basically determined by Total DAI and Counter DAI included in DCI for scheduling PDSCH. Total DAI informs the size of the HARQ-ACK codebook transmitted in slot n, and Counter DAI informs the location of the HARQ-ACK codebook transmitted in slot n. Next, in Rel-15 NR, the dynamic HARQ-ACK codebook is set by [pseudo-code 3].

[Start pseudo-code 3]

[Exit pseudo-code 3]

[pseudo-code 3] is applied when the transmission period of the SPS PDSCH is greater than 1 slot, and when the transmission period of the SPS PDSCH is less than 1 slot, the dynamic HARQ-ACK codebook is determined by the following [pseudo-code 4]. will be. Alternatively, [pseudo-code 4] may be generally applied regardless of the SPS PDSCH transmission period or the number of SPS PDSCHs activated in one cell or/and one BWP (or one cell/one BWP).

[Start pseudo-code 4]

[Exit pseudo-code 4]

In the above-mentioned [pseudo-code 4], the value k, which is the number of SPS PDSCHs in one slot, corresponds only to one SPS PDSCH configuration in one cell/one BWP, or multiple SPS PDSCH configurations in one cell or/and one BWP. If possible, all SPS PDSCH configurations may be included.

The [pseudo-code 3] or [pseudo-code 4] may be applied in a situation where HARQ-ACK information transmission is limited to at most one per slot.

[Example 6-3: Individual HARQ-ACK transmission method for multiple SPS PDSCHs transmitted in one slot]

When the UE receives a DL SPS transmission period smaller than 1 slot and an upper signal configured to transmit only one HARQ-ACK per slot, the DL SPS PDSCH 632 and DL SPS PDSCH received in slot k as shown in 630 of FIG. 6 . The HARQ-ACK information for (634) is transmitted on the PUCCH of the slot k+i indicated in advance by the upper signal or the L1 signal or a combination thereof. As an example, the UE determines the granularity of the PDSCH to HARQ-ACK feedback timing indicator in the DCI format indicating DL SPS activation at the slot level, and the base station determines the slot index in which the DL SPS PDSCH is received and the HARQ-ACK information is transmitted. The difference value from the slot index is provided to the terminal, and the PUCCH resource through which HARQ-ACK information is transmitted in the slot indicated by L1 is set to the terminal as a higher signal. 630 of FIG. 6 shows a situation in which the PDSCH to HARQ-ACK feedback timing indicator indicates the value of i. The corresponding value may be directly selected as the L1 signal, or candidate values may be set as an upper signal, and it may be possible to select one of these values as the L1 signal.

When a terminal or a base station wants to separately transmit/receive HARQ-ACK information for DL SPS PDSCHs that are individually transmitted/received, the base station has a DL SPS transmission period smaller than one slot and a higher level so that two or more HARQ-ACKs can be transmitted per slot. signal can be set. For example, as in 660 of FIG. 6 , the UE transmits HARQ-ACK information for the SPS PDSCH 662 received in slot k through the PUCCH 666 in slot k+i, and HARQ- for the SPS PDSCH 664 . ACK information may be transmitted through the PUCCH 668 in slot k+i. To enable this, as an example, the UE determines the granularity of the PDSCH to HARQ-ACK feedback timing indicator in the DCI format indicating DL SPS activation at the symbol level, and the value is the transmission end symbol (or transmission start of the SPS PDSCH). symbol) to the total symbol length from the transmission start symbol (or the transmission end symbol) of the PUCCH in which the corresponding HARQ-ACK information is transmitted.

In 660 of FIG. 6, when the end symbol of the SPS PDSCH 662 is s0, and the start symbol of the PUCCH 666 through which HARQ-ACK information for the SPS PDSCH 662 is transmitted is s1, PDSCH to HARQ-ACK timing indicator A value indicated by “s1-s0” may be directly selected by the L1 signal, or candidate values may be set as an upper signal and one of these values may be determined as the L1 signal. Through the information, the UE can determine the start symbol of the PUCCH to which the HARQ-ACK information for the SPS PDSCH will be transmitted.

Other PUCCH transmission information may be determined as a higher-order signal, an L1 signal, or a combination thereof. If the PUCCH resource indicator in the L1 or higher signal of Rel-15 is used, the terminal may determine that the "starting symbol index" field among the values indicated by the corresponding indicator is not used. Alternatively, since the starting symbol in which HARQ-ACK information is transmitted separately has already been provided through PDSCH to HARQ-ACK feedback timing indicator information, a new upper signal without a corresponding field or a signal composed of an L1 signal or a combination thereof will be provided to the UE. can In summary, the UE may differently interpret the PDSCH to HARQ-ACK feedback timing indicator field included in the DCI indicating SPS PDSCH activation according to the SPS PDSCH transmission period as follows.

- Method 6-3-1: Judging by slot level

- For example, when the transmission period of the SPS PDSCH is greater than 1 slot, the UE determines the granularity of the PDSCH to HARQ-ACK timing feedback indicator as the slot level.

- Method 6-3-2: Judging by symbol level

- For example, when the transmission period of the SPS PDSCH is less than 1 slot, the UE determines the granularity of the PDSCH to HARQ-ACK timing feedback indicator as a symbol level.

[Example 6-4: DL SPS or CG (configured grant) period change method for aperiodic traffic]

The transmission period of the DL SPS supported by the base station may be a unit of a slot level or a symbol level. If information sensitive to the delay time of equipment operated in the factory is periodically generated and the period is not a value or multiple of the standard supported by the 3GPP standard organization, the base station can set an effective DL SPS transmission period. there will be no For example, when there is a traffic pattern having a 2.5 symbol interval, the base station may not be able to allocate only a DL SPS having a transmission period of 2 symbols or 3 symbols. Accordingly, there is a need to introduce a signal for setting a DL SPS transmission period having aperiodicity or dynamically changing the transmission period. It is possible for the terminal to dynamically change the transmission period by at least one of the following methods.

* Method 6-4-1: DL SPS transmission period allocation method with aperiodic

- The base station may be able to set the DL SPS transmission period in a bitmap manner. For example, when bitmap information composed of 10 bits exists as a higher-order signal, 1 is DL SPS transmission and 0 is DL SPS non-transmission. Even if not, it will be possible to create a DL SPS transmission period of various patterns. In addition, the pattern may be repeated in units of 10 slots. Alternatively, a bitmap size and a section indicated by a corresponding bit may be a slot, a symbol, or a symbol group. Corresponding information may be independently set as a higher-order signal, or it may be possible to vary the range of the transmission period that each bit can indicate according to the size of the bitmap. For example, when the size of the bitmap is 20, the time range indicated by each bit is in units of 7 symbols, and when the size of the bitmap is 10, the time range indicated by each bit is in units of slots.

- Alternatively, it will be possible for the base station to set two or more DL SPS transmission periods with an upper signal in advance, and to set a time difference for each consecutively transmitted DL SPS as a pattern. For example, it may be possible to determine a DL SPS transmission period having a 2-symbol interval and a 3-symbol interval for a 2.5-symbol traffic pattern. Table 8 below is a table regarding the setting of the aperiodic DL SPS transmission period. Z is a prime number having a value of (up to) the first decimal unit, and has a relationship of X<Z<X+1. For example, when Z is 3.2, X has a value of 3. Gap 1 means a symbol interval between the first SPS PDSCH resource received by the UE and the second SPS PDSCH resource thereafter after receiving the DCI indicating SPS activation. Gap 2 means a symbol interval between the second SPS PDSCH resource and the third SPS PDSCH resource thereafter. That is, Gap i means a symbol interval between the i-th SPS PDSCH resource and the i+1-th SPS PDSCH resource thereafter. Configuration is a parameter for selecting one of various patterns, and Table 8 shows a configuration with a total of 9 patterns. The corresponding parameter is provided to the UE by a higher-order signal or an L1 signal, and the UE can determine the DL SPS PDSCH transmission period pattern based on the value indicated by the corresponding parameter. As another example, it may be possible that a value of one of the configurations is implicitly determined according to a value of a traffic generation period. For example, if the base station and the terminal transmit/receive the information according to the 2.3 symbol traffic pattern and the corresponding pattern according to the upper signal configuration, the base station and the terminal may determine that configuration 3 is applied.

[Table 8]

* Method 6-4-2: How to change the dynamic DL SPS transmission period

- Method 6-4-2-1: Include transmission period information in DCI indicating DL SPS activation

A DL SPS transmission period value may be included in the DCI information. A set of transmission period candidate values is previously set with a higher-order signal, and a specific value in the set may be indicated as information included in DCI. For example, when the transmission period is set to {1 slot, 2 slots} with the upper signal, 1 bit of the corresponding transmission period field is included in the DCI, and the 1 bit indicates whether the transmission period is 1 slot or 2 slots. That is, the number of DCI bits is determined according to the set of transmission periods set as the upper signal, and when the number of sets is N, a total of ceil(log ₂ (N)) bits are included in the DCI. The corresponding DCI corresponds to a non-fallback DCI such as DCI format 1_1, and in the case of a fallback DCI such as DCI format 1_0, even if the corresponding field does not exist or exists, a fixed bit value or/and period values associated with each corresponding bit value may be applied. . For example, in the case of fallback DCI, the field indicating the transmission period may have a fixed number of bits with n bits, or/and the value of the transmission period indicated by each value of the field may be fixed.

- Method 6-4-2-2: Utilize existing field in DCI format indicating DL SPS activation 1

When one field in the DCI format indicating DL SPS activation indicates a specific value, the value of another field may be used to indicate a transmission period rather than the previously indicated value. For example, when all bit values of the field indicating the HARQ process number in the DCI indicating DL SPS activation indicate a value of “1”, the DL SPS field indicating the time resource information is previously set as a higher signal. It may be utilized for the purpose of notifying one DL SPS transmission period among a set of transmission periods.

- Method 6-4-2-3: Utilize existing field in DCI format indicating DL SPS activation 2

In the case of DCI format indicating DL SPS activation, it may be possible that a specific field in the corresponding DCI format itself always indicates the transmission period, or that a specific value among specific fields in the corresponding DCI format indicates the transmission period. In one example, the terminal - When the received DCI is verified in a format indicating SPS PDSCH activation, if the value of the time resource allocation field included in the DCI is a specific value, the value of the time resource allocation field is the start symbol of the existing SPS PDSCH and it is determined to be used as a value indicating the transmission period of the SPS PDSCH rather than a value indicating the length. The mapping relationship between the specific value of the time resource allocation field and the SPS PDSCH transmission period may be set by higher level signaling or may be predetermined.

- Method 6-4-2-4: Search space-based implicit transmission period information setting

A transmission period value is dynamically changed according to a search space in which DCI indicating DL SPS activation is transmitted. For example, the DCI indicating DL SPS activation transmitted to the common search space indicates the SPS PDSCH transmission period A value, and the DCI indicating the DL SPS activation transmitted to the UE specific search space indicates the transmission period B value. The terminal may determine implicitly. The transmission period A and the transmission period B associated with the search space may be previously set by the terminal as a higher-order signal.

- Method 6-4-2-5: DCI format-based implicit transmission period information setting

The transmission period value is dynamically changed according to the DCI format indicating DL SPS activation. For example, DCI indicating activation of DL SPS transmitted in DCI format 1_0, which is fallback DCI, indicates the value of SPS PDSCH transmission period A, and DCI indicating activation of DL SPS transmitted in DCI format 1_1, which is non-fallback DCI, is SPS The UE may implicitly determine that the PDSCH transmission period B value is indicated. The transmission period A and the transmission period B may be previously set by the terminal as a higher-order signal.

In the present disclosure, when the transmission period of the SPS is within 1 slot, the UE does not expect to configure or receive DL SPS PDSCH time resource information having a length exceeding the transmission period of the DL SPS, and if the configuration or instruction comes down , the terminal considers it an error and ignores it. For example, when the transmission period of the DL SPS is 7 symbols, the UE must have the time resource length information of the DL SPS PDSCH within 7 symbols.

7 is a block diagram illustrating a process in which a UE transmits semi-static HARQ-ACK codebook-based HARQ-ACK information for DCI indicating deactivation of SPS PDSCH.

The UE receives the SPS PDSCH configuration information as a higher-order signal. In this case, the information set as the upper signal may include a transmission period, an MCS table, HARQ-ACK configuration information, and the like. After receiving the higher-order signal, the terminal receives (700) DCI for activating the SPS PDSCH from the base station. After receiving the DCI indicating the activation, the UE periodically receives the SPS PDSCH and transmits HARQ-ACK information corresponding thereto (702). Thereafter, when there is no more downlink data to be periodically transmitted/received, the base station transmits a DCI indicating SPS PDSCH deactivation to the terminal, and the terminal receives (704) it.

The UE transmits (706) HARQ-ACK information for DCI indicating deactivation of the SPS PDSCH according to the SPS PDSCH transmission period. For example, when the transmission period is greater than 1 slot, the terminal transmits the HARQ-ACK information for DCI indicating deactivation of the SPS PDSCH in the location of the HARQ-ACK codebook for HARQ-ACK information corresponding to the SPS PDSCH. do. HARQ-ACK information may be transmitted by at least one of the above-described method 6-1-1 or method 6-1-2 of FIG. 6 . When the transmission period is less than 1 slot, the UE may transmit HARQ-ACK information for DCI information indicating SPS PDSCH deactivation by at least one of methods 6-2-1 to 6-2-5. . The descriptions described above in FIG. 7 are operations applied when the terminal is previously set to use the semi-static HARQ-ACK codebook from the base station as a higher-order signal. In addition, the descriptions described above with reference to FIG. 7 may be limited to a case in which the terminal is set in advance to enable only one HARQ-ACK transmission per slot with a higher signal or standard or terminal capability.

8 is a block diagram illustrating a method for a UE to determine a dynamic HARQ-ACK codebook for SPS PDSCH reception.

When the UE is previously set to operate with the dynamic HARQ-ACK codebook as a higher-order signal, the UE starts determining the size of the HARQ-ACK codebook for HARQ-ACK information to be transmitted in a specific slot ( 800 ). The UE not only determines the HARQ-ACK codebook size for the dynamically scheduled PDSCH, but also calculates the total number of SPS PDSCHs generated in the slot corresponding to the slot to transmit HARQ-ACK information, and reflects this to the HARQ-ACK codebook size (802) do. The UE may be able to set the dynamic HARQ-ACK codebook by at least one of [pseudo-code 3] or [pseudo-code 4] described above in FIG. 6 . Thereafter, the UE terminates determining the size of the HARQ-ACK codebook ( 804 ), and transmits HARQ-ACK information in the corresponding slot.

In addition, the descriptions described above in FIG. 8 may be limitedly applied to a case in which the terminal is set in advance to enable only one HARQ-ACK transmission per slot with a higher signal or standard or terminal capability. For reference, when one SPS PDSCH is repeatedly transmitted across slot boundaries as in 650 of FIG. 6 , when determining the dynamic HARQ-ACK codebook, the UE determines the HARQ-ACK codebook size based on the last repeated transmission slot of the SPS PDSCH. to decide Specifically, in the case of slot k in 650 of FIG. 6, although the SPS PDSCH 652 is transmitted in slot k, 652 is not counted as the number of valid SPS PDSCHs to determine the dynamic HARQ-ACK codebook size. Instead, the terminal is slot k The dynamic HARQ-ACK codebook size is determined in consideration of the SPS PDSCH 654 transmitted in +1. In addition, in case of [pseudo-code 4], when determining the value of the number of SPS PDSCHs per slot (k) when determining the dynamic HARQ-ACK codebook size in a specific slot, the terminal terminates the last SPS PDSCH among repeatedly transmitted SPS PDSCHs. It is determined that the SPS PDSCH is valid in the slot to which it belongs (or the end slot).

9 is a block diagram illustrating a method of transmitting HARQ-ACK information according to a DL SPS transmission period of a UE.

The UE receives ( 900 ) configuration information on the maximum number of HARQ-ACK information transmissions per DL SPS transmission period or slot provided by an upper level signal or an L1 signal. Then, the DL SPS transmission period and the HARQ-ACK information transmission condition per slot are checked (902). When condition 1 is satisfied, the UE performs the first type of HARQ-ACK information transmission ( 904 ). If condition 2 is satisfied, the UE performs HARQ-ACK information transmission of the second type ( 906 ). Condition 1 may be equal to at least one of the following.

- When the transmission period of the DL SPS PDSCH is greater than 1 slot

- When only one HARQ-ACK transmission is possible per slot

Condition 2 may be equal to at least one of the following.

- When the transmission period of the DL SPS PDSCH is less than 1 slot

- When two or more HARQ-ACK transmissions are possible per slot

In the case of the above-described first type HARQ-ACK information transmission, the following field is included in the DCI format indicating activation of the DL SPS PDSCH.

- PDSCH to HARQ-ACK feedback timing indicator: indicates a slot in which a PDSCH is transmitted and a slot interval in which HARQ-ACK information is transmitted in units of slots. When one SPS PDSCH is repeatedly transmitted across a slot boundary as in 650 of FIG. 6 , the reference of a slot in which the PDSCH is transmitted is a slot in which the last repeatedly transmitted SPS PDSCH is located.

- PUCCH resource indicator: number of symbols, start symbol, PRB index, PUCCH format, etc.

Through the above information, the UE may set the PUCCH transmission resource and transmission format in which the HARQ-ACK information for the DL SPS PDSCH will be transmitted. In addition, a set of values of the two field values may be set in advance as higher-order signals, and one of the values may be selected as DCI.

In the case of the above-described second type HARQ-ACK information transmission, the following field is included in the DCI format indicating activation of the DL SPS PDSCH.

- PDSCH to HARQ-ACK feedback timing indicator: indicates the end symbol of the PDSCH and the start symbol interval at which HARQ-ACK information is transmitted in symbol units

- PUCCH resource indicator: number of symbols, PRB index, PUCCH format, etc.

Through the above information, the UE may set the PUCCH transmission resource and transmission format in which the HARQ-ACK information for the DL SPS PDSCH will be transmitted. In addition, a set of values of the two field values may be set in advance as higher-order signals, and one of the values may be selected as DCI.

10 is a block diagram illustrating simultaneous operation of a terminal for dynamically changing a DL SPS transmission period.

The UE receives higher-order information about the SPS PDSCH, including information such as a transmission period, MCS table, and HARQ-ACK information. Thereafter, the terminal receives (1000) DCI indicating activation of the SPS PDSCH. The UE then receives the SPS PDSCH and transmits HARQ-ACK information corresponding thereto in the resource region determined by the upper signal and the L1 signal (1002). The terminal receives (1004) DCI indicating SPS PDSCH change information. Here, the change information may include an SPS PDSCH transmission period value in addition to an MCS value or a size of a frequency and time resource region. For reference, as possible methods for changing the SPS PDSCH transmission period, at least one of the methods 6-4-1 to 6-4-2 described above with reference to FIG. 6 may be used. After receiving the DCI, the UE receives the SPS PDSCH and transmits HARQ-ACK information corresponding thereto according to the changed information (1006). When the SPS PDSCH transmission period is changed to an upper signal or an L1 signal, when an SPS PDSCH that crosses a slot boundary that may be generated according to a transmission period and a time resource region in which the SPS PDSCH is transmitted/received occurs, the UE may use at least one of the following methods The corresponding SPS PDSCH may be transmitted/received.

- Method 10-1: SPS PDSCH not transmitted/received

For example, if the SPS PDSCH is allocated across slot k and slot k+1 as in 650 of FIG. 6 , the UE regards the allocated SPS PDSCH as erroneously configured and does not receive the HARQ corresponding thereto. -ACK information is also not transmitted.

- Method 10-2: Repeat transmission/reception by dividing the corresponding SPS PDSCH based on the slot boundary

For example, when the SPS PDSCH is allocated across slot k and slot k+1 as in 650 of FIG. 6, the UE divides the SPS PDSCH into the form of the SPS PDSCH 652 and the SPS PDSCH 654 and repeats them. considered to be received. In addition, the UE transmits only one HARQ-ACK information for this based on the last SPS PDSCH 654 .

- Method 10-3: Perform partial transmission/reception only in the slot before the slot boundary for the corresponding SPS PDSCH

For example, when the SPS PDSCH is allocated across slot k and slot k+1 as in 650 of FIG. 6 , the UE determines that an SPS PDSCH valid only for the SPS PDSCH 652 is allocated, and selects the SPS PDSCH. receive That is, the terminal and the base station do not transmit/receive on the SPS PDSCH 654 . And when the UE transmits HARQ-ACK information, only one is transmitted based on the SPS PDSCH 652 .

- Method 10-4: Performing the corresponding transmission and reception only for the slot that crosses the slot boundary for the corresponding SPS PDSCH

For example, if the SPS PDSCH is allocated across slot k and slot k+1 as in 650 of FIG. 6 , the UE determines that an SPS PDSCH valid only for the SPS PDSCH 654 is allocated, and selects the SPS PDSCH. receive That is, the terminal and the base station do not transmit/receive on the SPS PDSCH 652 . And when the UE transmits HARQ-ACK information, only one is transmitted based on the SPS PDSCH 654 .

11 is a terminal operation diagram illustrating a method of transmitting HARQ-ACK information for SPS release in a situation where two or more DL SPSs are activated.

When the UE can operate two or more activated DL SPSs in one cell or/and one BWP, the base station may configure two or more DL SPSs for one UE. The reason for supporting two or more DL SPS settings is that when the UE supports various traffic, different MCS or time/frequency resource allocation or period may be different for each traffic, so it may be advantageous to configure DL SPS settings for each purpose. because there is

The UE may receive at least some of the higher-order signal configuration information shown in Table 9 for the DL SPS.

[Table 9]

The SPS index among the higher signal configuration information may be used for the purpose of indicating which SPS DCI (L1 signaling) providing SPS activation or deactivation indicates. Specifically, in a situation where two SPSs are set as higher signals in one cell or/and one BWP, the DCI indicating SPS activation instructs the UE to know which SPS of the two SPS activation SPS informs SPS higher level information Index information may be required. As an example, the HARQ process number field in the DCI indicating activation or deactivation of the SPS indicates an index of a specific SPS, and the terminal may activate or deactivate the SPS indicated through the HARQ process number field. Specifically, as shown in Table 10, when the DCI including the CRC scrambled with CG-RNTI includes the following information and the New Data Indicator (NDI) field of the DCI indicates 0, the UE indicates that the DCI is the HARQ process number field. It can be determined as indicating the pre-activated specific SPS PDSCH release (deactivation).

[Table 10]

In Table 10, one HARQ process number may indicate one SPS index or it may be possible to indicate a plurality of SPS indexes. In addition to the HARQ process number field, one or a plurality of SPS index(s) may be indicated by other DCI fields (time resource field, frequency resource field, MCS, RV, PDSCH-to-HARQ timing field, etc.). Basically, one SPS may be activated or deactivated by one DCI.

The position of the type 1 HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is the same as the position of the type 1 HARQ-ACK codebook corresponding to the reception position of the corresponding SPS PDSCH. When the position of the HARQ-ACK codebook corresponding to the candidate SPS PDSCH reception in the slot is k ₁ , the position of the HARQ-ACK codebook for DCI indicating the release of the corresponding SPS PDSCH is also k ₁ . Therefore, when DCI indicating SPS PDSCH release is transmitted in slot k, the terminal does not expect to receive the PDSCH corresponding to the HARQ-ACK codebook position k ₁ in the same slot k, and when this situation occurs, the terminal is considered an error case.

In Table 10, DCI formats 0_0 and 1_0 are exemplified, but DCI formats 0_1 and 1_1 can be applied as well, and DCI formats 0_x and 1_x can be sufficiently extended and applied to other DCI formats 0_x and 1_x. By the above-described operation, the UE receives the DCI indicating reception of the SPS PDSCH upper signal and the activation of the SPS PDSCH, so that one or more SPS PDSCHs are simultaneously operated (1100) in one cell or / and one BWP. . Thereafter, the UE periodically receives the activated SPS PDSCH in one cell or/and one BWP and transmits HARQ-ACK information corresponding thereto (1102). The UE transmits the PUCCH resource to which the HARQ-ACK information corresponding to the SPS PDSCH will be transmitted, slot interval information by the PDSCH-to-HARQ-ACK feedback timing field included in the activated DCI information, and n1PUCCH- included in the SPS higher-order configuration information It is determined through accurate time and frequency information and PUCCH format information in the corresponding slot through AN information. If the PDSCH-to-HARQ-ACK feedback timing field included in the DCI information does not exist, the UE assumes one value previously set as an upper signal as a default value and determines that the corresponding value is applied.

In a situation where the Type 1 HARQ-ACK codebook is set, when the terminal receives a DCI indicating deactivation of one SPS PDSCH (1104), the terminal determines the location of the HARQ-ACK codebook for HARQ-ACK information for the DCI. It is determined that it is the corresponding HARQ-ACK codebook location of the SPS PDSCH reception and HARQ-ACK information is transmitted. If deactivation of two or more SPS PDSCHs is indicated by one DCI, there may be a problem in which HARQ-ACK codebook position the UE includes and transmits HARQ-ACK information for the corresponding DCI. To solve this, the UE transmits 1106 HARQ-ACK using at least one of the following methods.

- Method a-1: According to the location of the HARQ-ACK codebook of the SPS PDSCH according to the SPS configuration with the lowest SPS index (or the highest SPS index)

According to this method, when two or more SPS PDSCHs are deactivated by DCI indicating deactivation, the UE corresponds to the SPS PDSCH reception having the smallest value (or the highest value or the middle value, etc.) among indices of the corresponding SPS PDSCH. HARQ-ACK information corresponding to the DCI indicating the deactivation is included in the HARQ-ACK codebook position. For example, when SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, the UE is located in the HARQ-ACK codebook corresponding to SPS PDSCH index 1 (or 5) in the DCI. HARQ-ACK information is included and transmitted.

- Method a-2: Include HARQ-ACK information in the earliest HARQ-ACK codebook occasion (latest HARQ-ACK codebook occasion)

According to this method, when two or more SPS PDSCHs are deactivated by DCI indicating deactivation, the UE is located at the earliest (or latest) HARQ-ACK codebook position among the positions of the HARQ-ACK codebooks of the corresponding SPS PDSCHs. HARQ-ACK information corresponding to DCI indicating deactivation is included. For example, in a situation in which SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, if the HARQ-ACK codebook location corresponding to the PDSCH reception of SPS PDSCH index 1 is k ₁ , if SPS The HARQ-ACK codebook position corresponding to the PDSCH reception of PDSCH index 2 is k ₂ , and if the HARQ-ACK codebook position corresponding to the PDSCH reception of the SPS PDSCH index 3 is k ₃ , k ₁ < k ₂ < k ₃ When, the terminal transmits HARQ-ACK information corresponding to the DCI to k ₁ (or k ₃ ) included in the transmission. If the location of the HARQ-ACK codebook for the PDSCH reception of two or more SPS PDSCHs is the same, the UE regards it as one and performs the above operation.

- Method a-3: Include HARQ-ACK information in All HARQ-ACK codebook occasions

According to this method, when two or more SPS PDSCHs are deactivated by DCI indicating deactivation, the UE selects the HARQ-ACK codebook location according to the above-described method a-1 or a-2, instead of selecting all HARQ-ACK HARQ-ACK information for the DCI is included in the codebook position and transmitted. For example, when SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, the UE places the DCI in the HARQ-ACK codebook positions corresponding to SPS PDSCH indexes 1, 4, and 5. HARQ-ACK information is included and transmitted. If the positions of at least two or more HARQ-ACK codebooks among the SPS PDSCHs are the same, the UE regards them as one and transmits HARQ-ACK information.

As another example, in a situation in which SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, if the HARQ-ACK codebook location corresponding to the PDSCH reception of SPS PDSCH index 1 is k ₁ , If the HARQ-ACK codebook position corresponding to PDSCH reception of SPS PDSCH index 2 is k ₂ , if the HARQ-ACK codebook position corresponding to PDSCH reception of SPS PDSCH index 3 is k ₃ , k ₁ < k ₂ < k When it is ₃ , the UE transmits the HARQ-ACK information corresponding to the DCI by including it in k ₁ , k ₂ , and k ₃ . If the location of the HARQ-ACK codebook for the PDSCH reception of two or more SPS PDSCHs is the same, the UE regards it as one and performs the above operation.

- Method a-4: gNB configuration

This method first means that the base station determines the above-described methods a-1 to a-3 as higher-order signals. Alternatively, secondly, in addition to methods a-1 to a-3, it may be possible for the base station to directly determine the location of the HARQ-ACK codebook as a higher-order signal or an L1 signal. At this time, when two or more SPS PDSCHs are deactivated by one DCI, the base station sets one or more HARQ-ACK codebook positions with an upper or L1 signal within the candidate HARQ-ACK codebook position candidates corresponding to the deactivated SPS PDSCHs. Or, regardless of this, it may be possible to determine the HARQ-ACK codebook position as an upper or L1 signal.

When the UE receives a DCI indicating release or deactivation of the one or more SPS PDSCHs, HARQ-ACK information for a PDSCH scheduled by a DCI different from the location of the HARQ-ACK codebook to which the HARQ-ACK information for the corresponding DCI will be transmitted It is not expected that PDSCHs are scheduled by different DCIs so that the HARQ-ACK codebook positions for transmission are identical to each other. For example, in this case, the UE may regard another DCI as an error and may not receive the PDSCH.

Next, an example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to various embodiments of the present disclosure will be described with reference to FIG. 12 .

12 is a diagram schematically illustrating an example of a signal transmission/reception scheme for a groupcast service in a wireless communication system according to various embodiments of the present disclosure.

In FIG. 12 , an example of a groupcast in which the base station 1201 transmits the same control information and the same data to a plurality of terminals, for example, the terminals 1203 , 1205 , 1207 and 1211 will be described. First, the base station provides the MSs 1203, 1205, 1207, and 1211 with a system information block (SIB, hereinafter referred to as "SIB"), preset information, or preset information. It informs the G-RNTI that can be used to receive control information for groupcast through a message or the like. Here, the G-RNTI is a group radio network temporary identifier (G-RNTI, hereinafter referred to as "G-RNTI").

Each of the terminals 1203, 1205, 1207, and 1211 receives the G1-RNTI (or G-RNTI) transmitted from the base station 1201 and receives control information for groupcast using the G-RNTI. can do. The G-RNTI includes a cyclic redundancy check (CRC) of control information for groupcast, for example, downlink control information (DCI, hereinafter referred to as “DCI”). It may be scrambled and transmitted.

In FIG. 12 , a terminal 1209 may be a terminal accessing the base station 1201 , and a cell radio network temporary identifier (C-RNTI, hereinafter “C-RNTI”) from the base station 1201 . ) may be a receiving terminal. Also, the terminal 1211 may be a terminal accessing the base station 1201 , and may be a terminal that has received a C-RNTI from the base station 1201 and also received a G-RNTI for groupcast.

Meanwhile, when the same control information and data are transmitted and one or a plurality of terminals can receive the transmitted, the same control information and data, this may be referred to as a groupcast for the control information and data. In addition, like the terminal 1209 or the terminal 1211 in FIG. 5, a C-RNTI or a terminal-specific RNTI is received, and only certain terminals receive control information and data using the C-RNTI or a terminal-specific RNTI. If it is being received, it may be referred to as unicast for the control information and data.

Meanwhile, in various embodiments of the present disclosure, the terminal may be configured to receive a control channel signal and a data channel signal for groupcast from the transmitter A, and receive a control channel signal and a data channel signal for unicast from the transmitter B. there is. In various embodiments of the present disclosure, the transmitter A and the transmitter B may be the same transmitter or different transmitters. In addition, in various embodiments of the present disclosure, each of the transmitting end A and the transmitting end B may be a base station, or may be a vehicle or a general terminal.

When each of the transmitting end A and the transmitting end B is a base station, groupcast data and unicast data may be transmitted from the base station, that is, transmitted through a Uu link.

Contrary to this, when each of the transmitter A and the transmitter B is a vehicle or a general terminal, the groupcast transmission and the unicast transmission may be sidelink transmissions. In this case, each of the transmitting end A and the transmitting end B may be a terminal operating as a leader node or an anchor node in the corresponding group, and therefore, each of the transmitting end A and the transmitting end B is at least one It may be a terminal capable of performing groupcast transmission to another terminal and receiving control information from the at least one other terminal. In addition, in various embodiments of the present disclosure, of course, the transmitter A may be a vehicle, and the transmitter B may be a base station. In addition, various embodiments of the present disclosure are described assuming that the transmitting end A and the transmitting end B are one transmitting end, but the various embodiments of the present disclosure can be applied even when the transmitting end A and the transmitting end B are different transmitting ends Of course.

Meanwhile, the UE receives an RNTI (in the following description, for the group cast) corresponding to a unique identifier (ID, hereinafter referred to as “ID”) for receiving the control channel signal and the data channel signal for the group cast. It should be noted that the RNTI corresponding to the unique ID for receiving the control channel signal and the data channel signal may be used in combination with the G-RNTI or the group common RNTI or the Multicast and Broadcast Service (MBS)-RNTI or the group identifier. ), or from a base station or another terminal in the group (here, another terminal in the group may be a leader node). The terminal may receive a control channel signal for groupcast using the G-RNTI, and may receive a data channel signal based on the control channel signal for groupcast.

In addition, in various embodiments of the present disclosure, the control channel for data scheduling is a physical downlink control channel (PDCCH: physical downlink control channel, hereinafter referred to as “PDCCH”) or a physical sidelink control channel (PSCCH: physical sidelink control) channel, hereinafter referred to as "PSCCH") may be used interchangeably, and the data channel is a physical downlink shared channel (PDSCH) or a physical sidelink shared channel (PSSCH). : may be mixed with a physical sidelink shared channel, hereinafter referred to as "PSSCH"), and the feedback channel is mixed with a physical uplink control channel (PUCCH: physical uplink control channel, hereinafter referred to as "PUCCH") or PSCCH can be In addition, in various embodiments of the present disclosure, it is assumed that the control information for scheduling received by the terminal is DCI as an example, but the control information for the scheduling may be implemented in various forms other than the DCI. am.

In various embodiments of the present disclosure, one terminal transmitting the same data to a plurality of terminals or a base station transmitting the same data to a plurality of terminals may be referred to as groupcast or multicast. It should be noted that in various embodiments of the present disclosure, groupcast may be used in combination with multicast.

In addition, in various embodiments of the present disclosure, "data" may include a transport block (TB) transmitted through a shared channel such as PDSCH, PUSCH, PSSCH, and the like.

In the present disclosure, an example of what is described as a high-level signal (or high-level signal, high-level signal, high-level signal) means terminal common high-order signals such as MIB or SIB, or terminal-specific high-level signals such as RRC or MAC CE can mean

In the present disclosure, an example of what is described as an L1 signal means a specific field in DCI or DCI format information, means RNTI information scrambled with CRC of DCI, or control region resource information through which DCI is transmitted/received. It may mean.

In the present disclosure, groupcast data can be scheduled by DCI or semi-static-scheduling like SPS without DCI is possible. In addition, the presence or absence of HARQ-ACK feedback for groupcast data may be notified by an upper level signal or an L1 signal. In addition, when HARQ-ACK feedback for group cast data is configured, the corresponding HARQ-ACK feedback type may be divided into two types. The first type transmits a NACK when data decoding fails and an ACK when data decoding succeeds. This is called a first HARQ-ACK feedback type (ACK/NACK information report). The second type is a case in which HARQ-ACK feedback is not performed when data decoding is successful and a NACK is sent only when data decoding fails, which is called a second HARQ-ACK feedback type (reports only NACK information).

Through the first HARQ-ACK feedback type, the base station can know whether data decoding has succeeded or failed for each terminal that has received groupcast data. Therefore, it is possible to retransmit the optimized group data data for the failed terminals. In addition, when the UE misses DCI for scheduling the corresponding data, it does not transmit whether it is ACK or NACK. This is called no detection (DTX), and the base station may perform more optimized retransmission in consideration of this. Specifically, when retransmitting data, the base station sets a data information section to be transmitted using a redundancy version (RV). If the base station re-schedules the data because the terminal fails to decode the data, the base station changes the RV value, so that the decoding performance of the terminal can be improved by transmitting and receiving more parity bits. On the other hand, if the terminal does not receive the data itself by missing the scheduling DCI for the first data, the base station may retransmit the data with the same RV value as the first transmission. According to this method, since the HARQ-ACK feedback resource needs to be set for each terminal receiving the groupcast data, a lot of uplink resources may be required.

On the other hand, through the second HARQ-ACK feedback type, the base station can know only whether data decoding for groupcast data has failed, and in general, when data decoding fails for terminals receiving groupcast data, common HARQ-ACK feedback NACK information will be transmitted through the resource. Therefore, unlike the first HARQ-ACK feedback type, it is not possible to determine whether groupcast data decoding is successful for each UE. Accordingly, when NACK is detected (or the detected received energy is greater than or equal to a specific level) through at least the HARQ-ACK feedback resource, the base station may determine that at least one terminal has failed to decode groupcast data. Accordingly, the base station retransmits the corresponding groupcast data. According to the corresponding feedback type, all or some terminals receiving groupcast data can report NACK information using a common HARQ-ACK feedback resource, so groupcast data retransmission will be possible with a small HARQ-ACK feedback resource. However, if some terminals miss the DCI scheduling group cast data, they will not be able to transmit HARQ-ACK information. Accordingly, if at least one terminal among terminals receiving the groupcast data does not transmit a NACK, the base station will consider that all terminals have successfully received the groupcast data. Accordingly, UEs that have missed the DCI scheduling group cast data may not be able to retransmit the corresponding data.

In a situation in which groupcast data is transmitted/received through the SPS, since there is no separate scheduling DCI, the terminal receiving the groupcast data will not miss DCI reception. Accordingly, some disadvantages of the above-described second HARQ-ACK feedback type may not exist in the SPS. However, if the SPS receives higher-order signal information as shown in Table 9 and receives the remaining information through DCI, activation of the SPS will be indicated by the DCI, and the terminal receives data scheduled by the DCI indicating the activation of the SPS. SPS activation is completed by receiving and reporting HARQ-ACK information. Similarly, by the DCI instructing the release (or deactivation) of the SPS, the terminal reports HARQ-ACK information for the DCI without separate data transmission and reception, thereby completing the SPS release. If the SPS is for groupcast data transmission/reception, there is a possibility that the SPS is transmitted/received based on groupcast as DCI indicating activation and release of the SPS. Therefore, the following describes a process of transmitting and receiving groupcast data using the SPS.

13 is a diagram illustrating an SPS-based groupcast data transmission/reception method according to an embodiment. While the SPSs described in FIGS. 3 to 11 are mainly SPSs for unicast data, FIG. 13 is an SPS for groupcast data. If the SPS operation process for unicast data is applied to groupcast as it is, terminals receiving groupcast data first receive SPS higher-order signal information as shown in Table 9 in advance, and then the DCI 1301 that activates the corresponding SPS. ) and after receiving the PDSCH 1303 scheduled by the corresponding DCI, the PDSCH decoding result will be reported to the base station as the HARQ-ACK 1313 . Thereafter, the terminal receiving the group cast data receives the PDSCHs 1305 and 1307 without DCI scheduling at a period (period, 1311) previously set as a higher signal based on the slot in which the PDSCH 1303 is transmitted and received, and HARQ for this -ACK(1315, 1317) will be reported. Thereafter, the terminal receiving the group cast data receives the DCI 1309 instructing release of the corresponding SPS, and reports the DCI decoding result through the HARQ-ACK 1319 scheduled by the DCI. After that, the release of the SPS will be completed.

The above-described SPS operation description corresponds to a case in which all terminals successfully receive DCI information indicating activation or release of SPS for groupcast data. If some of the terminals to receive groupcast data miss DCI information instructing SPS activation or release, the SPS operation cannot be performed correctly, so the SPS operation is improved in consideration of the case where the terminal misses the DCI information. it will need to be

In addition, if the HARQ-ACK (1313, 1319) corresponding to the DCI (1301, 1309) indicating SPS activation or release is the second HARQ-ACK feedback type that reports only NACK information, although there are few HARQ-ACK information resources Although it is possible to transmit and receive data using HARQ-ACKs 1313 and 1319 corresponding to HARQ-ACK should be the first HARQ-ACK feedback type. That is, the HARQ-ACK 1313 for the groupcast data 1303 in which the corresponding DCI 1301 exists is the first feedback type, and the base station may receive ACK or NACK at 1313 .

After the SPS is activated, the HARQ-ACKs 1315 and 1317 for the groupcast data 1305 and 1307 received without scheduling DCI may be the first HARQ-ACK feedback type or the second HARQ-ACK feedback type. Information indicating whether the first HARQ-ACK feedback type or the second HARQ-ACK feedback type is applied may be indicated by a specific field in DCI that activates the SPS or may be notified by a higher-order signal. If the HARQ-ACK 1313 corresponding to the DCI 1301 indicating SPS activation is the first HARQ-ACK feedback type, the base station individually corresponds to the DCI (first DCI) of the terminals receiving the groupcast data. ) may be judged through ACK, NACK, or DTX whether or not it has been well received.

Specifically, when the base station receives the ACK or NACK, the base station may determine that at least the DCI (first DCI) for activating the SPS has been successfully received. On the other hand, when the base station determines that the DTX is fed back, the base station may determine that the corresponding terminal has not received DCI (first DCI) for activating the SPS. Accordingly, the base station may be able to re-transmit the DCI (second DCI, 1302) indicating SPS activation information at least again for DTX terminals. However, since DCI (second DCI) information for activating SPS is likely to have an RNTI scrambled into one RNTI (G-RNTI) by all groupcast terminals, DCI (first DCI) for activating SPS A terminal that has received well may also receive the second DCI.

Therefore, it would be inefficient for the base station to configure resources other than the SPS previously activated by at least some terminals by the first DCI through the second DCI. Accordingly, it would be reasonable for the base station to activate at least one of the SPS resources 1305 and 1307 after the first SPS resource 1303 as the second DCI for terminals that have missed the first DCI. This is because, when the SPS resource 1305 is activated by the second DCI, it has the same period as the SPS resource 1303 activated by the first DCI. Accordingly, terminals that have received the first DCI and the second DCI may consider that the SPS having the same period is activated.

In the case of a UE that has received the first DCI 1301 well, it will receive the SPS resources 1305 and 1307 without the second DCI 1302 . Therefore, in the case of the corresponding terminal, even if the second DCI 1302 is received, if the corresponding information is the same as that of the first DCI 1301, it may be possible to ignore it. In this case, the UE will report the HARQ-ACK information 1315 and 1317 for the SPS resources 1305 and 1307 configured in advance, and the corresponding HARQ-ACK feedback is the first HARQ-ACK feedback type or the second HARQ-ACK feedback. may be of any type. Alternatively, in the case of the terminal, although the first DCI 1301 was well received, it may be possible to follow the information indicated by the second DCI 1302 . Accordingly, it will receive the SPS resource region 1305 indicated by the second DCI 1302 and report HARQ-ACK information for it (1305).

As another example, the base station may have the same or different resource areas for HARQ-ACK information for DCI scheduled for SPS activation or release and HARQ-ACK information for other SPS PDSCHs, and these resources are may be notified to the terminal by a higher-order signal or an L1 signal. In addition, in addition to the DCI scrambled by the groupcast data related RNTI (eg, G-RNTI), the HARQ-ACK resource is additionally provided by the DCI scrambled by the unicast data related RNTI (eg, C-RNTI) for each groupcast terminal. It may be set differently. Accordingly, the resource region in which the HARQ-ACK information 1315 for the terminal that has received the second DCI 1302 is transmitted and received (that is, the HAQ-ACK resource region for whether or not the second DCI is received), and the second DCI 1302 ), but ignore it or fail to receive the second DCI 1302 and receive the SPS resource 1305 in the resource region in which the HARQ-ACK information 1315 is transmitted and received (that is, the SPS PDSCH 1305). ) for HARQ-ACK resource region) may be the same or different, and may have different HARQ-ACK feedback types.

The above-described HARQ-ACK information may mean a PUCCH or PUSCH resource through which HARQ-ACK feedback information is transmitted or received, or may mean HARQ-ACK information such as ACK/NACK/DTX itself. The HARQ-ACK information is information transmitted by the terminal to the base station. The above-described SPS resource may mean a resource region in which the SPS PDSCH is transmitted/received or may be a resource region for a specific SPS index.

Similarly, when some terminals do not receive the corresponding DCI with respect to the DCI 1309 indicating the release of the SPS, the base station will retransmit the corresponding DCI information. Therefore, since the terminals that missed the DCI 1309 indicating the corresponding SPS release determine that the SPS will continue to operate, the HARQ-ACK information for the previously set SPS is not valid, but until the SPS of all terminals is released, the corresponding HARQ- It is preferable that the resource through which ACK information is transmitted and received is not used for other terminals. When the DCI 1309 instructing SPS release is transmitted by groupcast, terminals that have already transmitted the HARQ-ACK information 1319 for this are then retransmitted when the DCI indicating the same SPS release is retransmitted. HARQ-ACK information may not be transmitted. This is because, since confirmation information (HARQ-ACK information) for SPS release is transmitted to the base station, the terminal does not need to send the same information again, and thus power consumption of the terminal can be reduced.

As another example, when the DCI 1309 instructing the release of the SPS is transmitted by groupcast, the terminals that have already transmitted the HARQ-ACK information 1319 for the DCI will then receive the DCI instructing the release of the SPS to be retransmitted. In this case, HARQ-ACK information may be transmitted without ignoring it. This is because, even if the UE has previously transmitted confirmation information (HARQ-ACK information) for SPS release, there is a possibility that the base station may miss it. There is a need to transmit information.

13 basically considers a situation in which the SPS for groupcast data is activated or released by the combination of the upper signal and the L1 signal, but the following description will be made with respect to the case where the SPS is set only with the upper signal. When the SPS for groupcast is set only as a higher-order signal, at least some of the information shown in Table 11 below in addition to Table 9 should be set as a higher-order signal for the UE.

- Carrier indicator: indicates on which carrier the data scheduled by DCI is transmitted
- Identifier for DCI formats: Indicates the DCI format, and specifically, it is an indicator for distinguishing whether the corresponding DCI is for downlink or uplink.
- Bandwidth part indicator: Indicate if there is a change in the bandwidth part
- Frequency domain resource assignment: This is resource allocation information indicating frequency domain resource allocation, and the resource expressed varies depending on whether the resource allocation type is 0 or 1.
- Time domain resource assignment: As resource assignment information indicating time domain resource assignment, one setting of upper layer signaling or a predetermined PDSCH time domain resource assignment list may be indicated.
- VRB-to-PRB mapping: indicates a mapping relationship between a virtual resource block (VRB) and a physical resource block (PRB)
- PRB bundling size indicator: indicates the physical resource block bundling size that the same precoding is assumed to be applied
- Rate matching indicator: indicates which rate match group is applied among the rate match groups set as the upper layer applied to the PDSCH
- ZP CSI-RS trigger: triggers the zero power channel state information reference signal
- Transport block (transport block, TB) related configuration information: indicates a modulation and coding scheme (MCS), a new data indicator (NDI) and a redundancy version (RV) for one or two TBs.
- Modulation and coding scheme (MCS): indicates the modulation scheme and coding rate used for data transmission. That is, it is possible to indicate a coding rate value that can inform TBS and channel coding information together with information on whether it is QPSK, 16QAM, 64QAM, or 256QAM.
- New data indicator (New data indicator): indicates whether HARQ initial transmission or retransmission.
- Redundancy version: indicates a redundancy version of HARQ.
- HARQ process number: indicates the HARQ process number applied to the PDSCH
- Downlink assignment index: an index for generating a dynamic HARQ-ACK codebook when reporting HARQ-ACK for PDSCH
- TPC command for scheduled PUCCH: Power control information applied to PUCCH for HARQ-ACK report for PDSCH
- PUCCH resource indicator: Information indicating the resource of PUCCH for HARQ-ACK report for PDSCH
- PDSCH-to-HARQ_feedback timing indicator: Configuration information on which slot PUCCH for HARQ-ACK report for PDSCH is transmitted
-Antenna ports: information indicating the antenna port of the PDSCH DMRS and the DMRS CDM group in which the PDSCH is not transmitted
- Transmission configuration indication: information indicating beam related information of PDSCH
- SRS request: information requesting SRS transmission
- CBG transmission information: information indicating which code block group (CBG) data is transmitted through the PDSCH when code block group-based retransmission is set
- CBG flushing out information: information indicating whether the code block group previously received by the terminal can be used for HARQ combining
- DMRS sequence initialization: indicates the DMRS sequence initialization parameter
- timeDomainOffset: indicates offset value information of SFN (System Frame Number)
- harq-ack-feedback: indicates the presence or absence of HARQ-ACK feedback
- harq-ack-feedback type: indicates the HARQ-ACK feedback type

Therefore, the terminal receives at least some of the information in [Table 9] and [Table 11] as a higher-order signal to periodically receive SPS-based groupcast data without reporting HARQ-ACK information for separate SPS activation or release. will be able The higher-order signal may be a UE-specific higher-order signal, a specific group higher-order signal for a groupcast terminal, or a higher-order signal such as SIB.

14 is a flowchart illustrating a method of operating an SPS of a terminal according to an embodiment. The UE determines whether the corresponding SPS PDSCH is activated by DCI indicating SPS higher signal reception and SPS PDSCH activation. Information on whether the corresponding SPS PDSCH is unicast or groupcast can be divided into higher-order signals, RNTI scrambled to DCI indicating SPS PDSCH activation, or specific bit field information in DCI or DCI format information. The UE receives data in the SPS PDSCH resource region indicated by the scheduling DCI and transmits HARQ-ACK information.

At this time, when the SPS PDSCH is a groupcast as described above in FIG. 13, whether the corresponding HARQ-ACK information is HARQ-ACK information for SPS PDSCH reception indicated by the scheduling DCI or the SPS PDSCH received periodically without the scheduling DCI is received Different HARQ-ACK feedback types may be applied depending on whether it is HARQ-ACK information for , and in this case, the UE may transmit HARQ-ACK information using different HARQ-ACK resources. The HARQ-ACK resource may be notified to the UE by the SPS higher signal or DCI indicating SPS PDSCH activation, respectively. After periodically receiving the SPS PDSCH, the UE receives DCI indicating deactivation of the SPS PDSCH and transmits HARQ-ACK information to complete the release of the SPS PDSCH.

As another example, when the SPS PDSCH is for groupcast data, the UE periodically receives SPS PDSCH without separate DCI scheduling other than reporting HARQ-ACK information for DCI indicating activation or release of the SPS PDSCH. It may be possible not to report HARQ-ACK information for this, and whether such an operation is set may be notified by a higher-order signal or an L1 signal.

15 is a flowchart illustrating a method of operating an SPS of a terminal according to an embodiment. If the corresponding SPS PDSCH is for groupcast data, the UE may activate or release the SPS PDSCH only with an upper signal without DCI indicating activation or release of a separate SPS PDSCH. Specifically, the UE receives a higher-order signal indicating activation of the SPS PDSCH. In this case, the higher-order signal may be a group cast-based higher-order signal or a unicast-based higher-order signal (or UE-specific higher-order signal) or a terminal common higher-order signal such as SIB. The group cast-based upper level signal may be an upper level signal that exists for the purpose of transmitting and receiving the same upper level signal to and from a certain group of terminals for the purpose of transmitting and receiving group cast data. Terminals that have received the corresponding higher-order signal information may be included in a group for transmitting and receiving the same groupcast data. Thereafter, the UE may receive the SPS PDSCH for groupcast data and transmit HARQ-ACK information in a periodic resource region designated as a higher signal. Alternatively, HARQ-ACK information may or may not exist, and the presence or absence of HARQ-ACK information for the SPS PDSCH may be configured as a higher-order signal. In addition, the HARQ-ACK information may be a first HARQ-ACK feedback type or a second HARQ-ACK feedback type, and this feedback type may be set as a higher-order signal. Afterwards, when the base station deactivates the SPS PDSCH for transmitting and receiving groupcast data, the base station will transmit and receive a higher-order signal indicating the deactivation of the SPS PDSCH to the terminals that have received the groupcast data, and then the terminals will no longer receive the SPS PDSCH periodically. won't

16 is a block diagram illustrating a structure of a terminal capable of performing an embodiment of the present disclosure.

Referring to FIG. 16 , the terminal of the present invention may include a terminal receiving unit 1600 , a terminal transmitting unit 1604 , and a terminal processing unit 1602 . The terminal receiving unit 1600 and the terminal transmitting unit 1604 may be collectively referred to as a transceiver in the embodiment. The transceiver may transmit/receive a signal to/from the base station. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. In addition, the transceiver may receive a signal through the wireless channel and output it to the terminal processing unit 1602 , and transmit the signal output from the terminal processing unit 1602 through the wireless channel. The terminal processing unit 1602 may control a series of processes so that the terminal may operate according to the above-described embodiment.

17 is a block diagram illustrating a structure of a base station capable of performing an embodiment of the present disclosure.

Referring to FIG. 17 , in the embodiment, the base station may include at least one of a base station receiving unit 1701 , a base station transmitting unit 1705 , and a base station processing unit 1703 . The base station receiving unit 1701 and the base station transmitting unit 1705 may be collectively referred to as a transceiver in the embodiment of the present invention. The transceiver may transmit/receive a signal to/from the terminal. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal. In addition, the transceiver may receive a signal through the wireless channel and output it to the base station processing unit 1703 , and transmit the signal output from the terminal processing unit 1703 through the wireless channel. The base station processing unit 1703 may control a series of processes so that the base station can operate according to the above-described embodiment of the present invention.

18 is a diagram illustrating HARQ-ACK information reporting according to PDSCH scheduling for a specific HARQ process according to an embodiment of the present disclosure. In FIG. 18 , the base station transmits the first PDSCH 1800 corresponding to the first HARQ process to the terminal, and receives the PUCCH or PUSCH including HARQ-ACK information 1802 for this. Thereafter, the base station transmits the second PDSCH 1810 corresponding to the first HARQ process to the terminal and receives the PUCCH or PUSCH including the HARQ-ACK information 1812 for the second PDSCH 1810 . In FIG. 18 , the first PDSCH and the second PDSCH may include the same transport block (TB) or different TBs, which may be distinguished by the UE by the NDI included in the control information (DCI). Identification of a specific HARQ process corresponding to the first PDSCH is indicated by the HARQ process number field included in the DCI for scheduling the first PDSCH, or in the case of an SPS PDSCH transmitted and received without DCI, the period at which the SPS PDSCH is transmitted and received; It may be determined according to the time point and the number of HARQ processes. As an example, the HARQ process may be determined by the following [Equation 1].

[Equation 1]

HARQ Process ID = [floor (CURRENT_slot Х 10 / (numberOfSlotsPerFrame Х periodicity))] modulo nrofHARQ-Processes + harq-ProcID-Offset

In [Equation 1], CURRENT_slot is a slot number through which SPS PDSCH is transmitted and received, and numberOfSlotsPerFrame is the total number of slots in one frame (10ms) and may have different number of slots according to subcarrier spacing. For example, in the case of 15 kHz, there are 10. Periodicity is the transmission/reception period of the corresponding SPS PDSCH. nrofHARQ-Processes is the number of HARQ processes that can be configured in the corresponding SPS PDSCH, and may have a value between 1 and 16. The harq-ProcID-Offset is a HARQ process ID offset value, and may have a value between 0 and 16, and the corresponding parameter itself may not exist.

If the terminal receives the first PDSCH 1800 corresponding to the first HARQ process, and transmits the PUCCH or PUSCH including the HARQ-ACK information 1802 thereto from the base station before the last symbol of transmission to the first HARQ process When a corresponding second PDSCH is received or a PDCCH including a DCI for scheduling a PDSCH is received, the UE regards this as an error case and may or may not receive the corresponding PDSCH. The reason for this is that the UE has a separate buffer for each HARQ process number and reports HARQ-ACK information generated after demodulating/decoding individual PDSCHs. When a PDCCH scheduling a corresponding PDSCH is received, a problem may occur in processing the PDSCH being processed in the corresponding buffer. Therefore, when the PDSCHs 1800 and 1810 have the same HARQ process for smooth PDSCH demodulation/decoding and HARQ-ACK report of the UE, the base station must guarantee the scheduling as shown in FIG. 18 .

If the PDSCH 1800 is multicast data and the transmission of HARQ-ACK information for it is determined by a higher-order signal or an L1 signal, the actual HARQ-ACK information 1802 for the PDSCH 1800 is included. PUCCH or PUSCH may not exist. In this case, as shown in FIG. 18 , since the base station does not have actual HARQ-ACK information 1802, from which point the terminal can receive the PDSCH 1810 for the first HARQ process number or DCI for scheduling the PDSCH 1810 It is difficult to determine whether the PDCCH including Therefore, when there is no actual HARQ-ACK information transmission and reception, it is necessary to define a timing point for scheduling a PDSCH having the same HARQ process, and the base station and the terminal can support this through at least one of the following methods.

- Method 18-1: determined by the PDSCH-to-HARQ timing and PUCCH resource indicator included in DCI. In control information (DCI) for scheduling PDSCH, a "PDSCH-to-HARQ timing" field indicating a difference value between a slot in which the PDSCH is transmitted/received and a slot in which HARQ-ACK information is transmitted/received exists. In addition, there is a "PUCCH resource indicator" field that informs the transmission resource (eg, the start symbol and transmission length of the PUCCH) information of the PUCCH to be transmitted in the slot in which the corresponding HARQ-ACK information is transmitted and received. The two fields can be set by the higher-order signal, and when there is no corresponding field, one value set by the higher-order signal can be used. At this time, the corresponding base station and the terminal are used only as information for determining at which point in time the PDSCH can be scheduled again using the same HARQ process described in FIG. Transmission and reception do not occur.

Method 18-1 can be limitedly applied to a case in which HARQ-ACK information for a PDSCH scheduling data for multicast can be indicated by an upper signal to another specific field in DCI whether to transmit HARQ-ACK information. Alternatively, the method 18-1 may be operated by separately setting a higher-order signal. Alternatively, method 18-1 may be limitedly applied to terminals that have reported a specific UE capability related to the same operation as method 18-1. For reference, method 18-1 may be a method applicable even when actual HARQ-ACK information transmission occurs through PUCCH or PUSCH, and in this case, PUCCH including HARQ-ACK information is PDSCH-to-HARQ timing and It is determined by the PUCCH resource indicator, and when the PUCCH including the HARQ-ACK information overlaps with another PUSCH, it is determined by additionally considering the transmission resource of the PUSCH scheduled in addition to the PUCCH. On the other hand, when there is no actual HARQ-ACK information transmission in Method 18-1, the PUSCH transmission resource may not be separately considered because there is no PUCCH resource including the actual HARQ-ACK information.

- Method 18-2: Assume the minimum PDSCH to HARQ processing time value of the UE. When the UE is not instructed to report the HARQ-ACK information by the upper signal or the L1 signal, the UE transmits/receives the PDSCH with the same HARQ process number or transmits/receives the PDCCH including the DCI for scheduling the PDSCH. Assume processing time. For example, the base station and the terminal transmit and receive the first PDSCH scheduled with the first HARQ process number up to x symbols, and then transmit and receive the second PDSCH scheduled with the first HARQ process number from after x + n symbols. Here, n may be the minimum PDSCH processing time value of the UE.

Specifically, the PDSCH processing time (PDSCH processing procedure time) will be described next. When the base station schedules the terminal to transmit the PDSCH using DCI format 1_0, 1_1, or 1_2, the terminal transmits a transmission method indicated through DCI (modulation and demodulation and coding indication index (MCS), demodulation reference signal related information, time and It may require a PDSCH processing time for receiving the PDSCH by applying frequency resource allocation information, etc.). In NR, the PDSCH processing time is defined in consideration of this. The PDSCH processing time of the UE may follow Equation 2 below.

[Equation 2]

Tproc,1 = ( N1 + d1,1 + d2 )( 2048 + 144 ) κ2 ^-μ Tc + Text

Each variable in Tproc,1 described above with [Equation 2] may have the following meaning.

N1: The number of symbols determined according to the terminal processing capability (UE processing capability) 1 or 2 and the numerology μ according to the capability of the terminal. [Table 12] can have a value of Numerology μ may correspond to a minimum value among μPDCCH, μPDSCH, and μUL so as to maximize the Tproc,1, and μPDCCH, μPDSCH, and μUL are respectively the pDCCH's pneumology for the PDSCH, the scheduled PDSCH's pneumology, It may mean the numerology of an uplink channel through which HARQ-ACK is to be transmitted. Table 12 corresponds to PDSCH processing time in case of PDSCH processing capability 1, and Table 13 corresponds to PDSCH processing time in case of PDSCH processing capability 2.

μ PDSCH decoding time N1 [symbols] When dmrs-AdditionalPosition = pos0 in DMRS-DownlinkConfig, which is upper layer signaling for both PDSCH mapping types A and B If both PDSCH mapping types A and B are not dmrs-AdditionalPosition = pos0 in DMRS-DownlinkConfig, which is higher layer signaling, or if higher layer parameters are not set 0 8 N1,0 One 10 13 2 17 20 3 20 24

μ PDSCH decoding time N1 [symbols] When dmrs-AdditionalPosition = pos0 in DMRS-DownlinkConfig, which is upper layer signaling for both PDSCH mapping types A and B 0 3 One 4.5 2 9 for frequency range 1

κ: 64

Text: When the terminal uses the shared spectrum channel access method, the terminal may calculate Text and apply it to the PDSCH processing time. Otherwise, Text is assumed to be 0.

If l1 indicating the PDSCH DMRS position value is 12, N1,0 of [Table x2-2] has a value of 14, otherwise it has a value of 13.

For PDSCH mapping type A, the last symbol of the PDSCH is the i-th symbol in the slot in which the PDSCH is transmitted, and if i < 7, d1,1 is 7-i, otherwise d1,1 is 0.

d2: When a PUCCH having a high priority index and a PUCCH or a PUSCH having a low priority index overlap in time, d2 of the PUCCH having a high priority index may be set to a value reported by the UE. Otherwise, d2 is 0.

When PDSCH mapping type B is used for UE processing capability 1, the d1,1 value may be determined according to the number d of overlapping symbols between L, which is the number of symbols of the scheduled PDSCH, and the PDCCH, which schedules the PDSCH, and the scheduled PDSCH, as follows. there is.

- If L ≥ 7, then d1,1 = 0.

- if L ≥ 4 and L ≤ 6, then d1,1 = 7 - L.

- If L = 3, then d1,1 = min (d, 1).

- if L = 2, then d1,1 = 3 + d.

When PDSCH mapping type B is used for UE processing capability 2, the d1,1 value may be determined according to the number d of overlapping symbols between L, which is the number of symbols of the scheduled PDSCH, and the PDCCH, which schedules the PDSCH, and the scheduled PDSCH, as follows. there is.

- If L ≥ 7, then d1,1 = 0.

- if L ≥ 4 and L ≤ 6, then d1,1 = 7 - L.

- When L = 2, if the scheduled PDCCH exists in a CORESET consisting of 3 symbols, and the corresponding CORESET and the scheduled PDSCH have the same start symbol, d1,1 = 3. Otherwise, d1,1 = d.

In the case of a terminal supporting capability 2 in a given serving cell, the PDSCH processing time according to terminal processing capability 2 may be applied when the terminal sets processingType2Enabled, which is higher layer signaling, to enable for the cell.

If the position of the first uplink transmission symbol of the PUCCH including HARQ-ACK information is may be considered) If it does not start earlier than the first uplink transmission symbol that appears after a time of Tproc,1 from the last symbol of the PDSCH, the UE must transmit a valid HARQ-ACK message. That is, the UE must transmit the PUCCH including the HARQ-ACK only when the PDSCH processing time is sufficient. Otherwise, the terminal cannot provide the base station with valid HARQ-ACK information corresponding to the scheduled PDSCH. The T-proc,1 may be used for both normal or extended CP. If the PDSCH consists of two PDSCH transmission positions in one slot, d1,1 is calculated based on the first PDSCH transmission position in the corresponding slot. When [Equation 2] is described with reference to FIG. 18, the minimum time interval between the first PDSCH 1800 and the second PDSCH 1810 should be Tproc,1.

Method 18-2 transmits the corresponding HARQ-ACK information through a specific field of the DCI format after receiving an indication through a specific field of the DCI format to dynamically determine whether or not multicast HARQ-ACK information is transmitted with an upper signal It can be applied limitedly to cases where it is instructed not to. Alternatively, method 18-2 may be applied limitedly to a case in which it is configured that no multicast HARQ-ACK information transmission is received as a higher-order signal. Alternatively, method 18-2 may be set by a separate higher-order signal. Alternatively, method 18-2 may be limitedly applied to UEs reporting specific UE capability.

- Method 18-3: Using the reference value set as the upper signal. According to the method, unlike Method 18-1 to Method 18-2, a reference time for the base station to transmit and receive a PDSCH having the same HARQ process number to the terminal in advance or to transmit/receive a PDCCH including a DCI for scheduling the PDSCH is set as a higher level signal. It may be possible to set Referring to FIG. 18 as an example, when the minimum time interval between the first PDSCH 1800 and the second PDSCH 1810 is referred to as a b symbol, the corresponding b value is a value previously set as a higher-order signal. Alternatively, the corresponding b value may correspond to a value that is at least one of the possible values by the terminal capability report before the upper signal setting.

19 is a flowchart illustrating an operation process of a base station for performing scheduling in consideration of the same HARQ process according to an embodiment of the present disclosure. The base station transmits the first PDSCH corresponding to the first HARQ process number to the terminal. Thereafter, the base station considers at least one of methods 18-1 to 18-3 or a combination of at least one of methods 18-1 to 18-3 in order to determine a condition for scheduling another PDSCH corresponding to the first HARQ process number used in the first PDSCH. For example, after the first PDSCH transmission, the base station is the last symbol of a resource for which actual HARQ-ACK information is received according to method 18-1 or actual HARQ- according to at least one of methods 18-1 to 18-3 Although there is no reception of ACK information, the second PDSCH corresponding to the first HARQ process number or the PDCCH for scheduling the second PDSCH can be scheduled to the corresponding terminal after the time point when a preset virtual HARQ-ACK report is received. . If the base station schedules the second PDSCH or the PDCCH for scheduling the second PDSCH to the corresponding terminal before the time point, the terminal regards it as an error case and performs an arbitrary operation or schedules the second PDSCH or the second PDSCH It may be possible that the corresponding terminal does not receive the PDCCH. Therefore, even if the base station transmits the second PDSCH or the PDCCH for scheduling the second PDSCH to the terminal, it cannot predict which information of the terminal has been received.

Although FIG. 19 has been described from the viewpoint of the operation of the base station, it is sufficiently possible to consider the operation from the viewpoint of the terminal. The terminal receives the first PDSCH corresponding to the first HARQ process number from the base station. Thereafter, the UE considers at least one of methods 18-1 to 18-3 or a combination of at least one of methods 18-1 to 18-3 in order to determine a condition for scheduling another PDSCH corresponding to the first HARQ process number used in the first PDSCH. For example, after the first PDSCH transmission, the terminal may transmit the last symbol of a resource for which actual HARQ-ACK information is received according to method 18-1 or actual HARQ- according to at least one of methods 18-1 to 18-3. Although there is no reception of ACK information, the second PDSCH corresponding to the first HARQ process number or the PDCCH for scheduling the second PDSCH may be scheduled from the corresponding base station after the point of time when a preset virtual HARQ-ACK report is received. . If the base station transmits the second PDSCH or the PDCCH for scheduling the second PDSCH to the terminal before the time point, the terminal regards it as an error case and performs an arbitrary operation based on the received second PDSCH or PDCCH or receives it. The information may not be considered, or the UE may stop the reception operation of the first PDSCH and may not perform HARQ-ACK information transmission corresponding thereto.

On the other hand, in the drawings for explaining the method of the present invention, the order of description does not necessarily correspond to the order of execution, and the precedence relationship may be changed or may be executed in parallel. Alternatively, some components may be omitted and only some components may be included in the drawings for explaining the method of the present invention without impairing the essence of the present invention.

In this disclosure, although the UE operation for the SPS PDSCH has been mainly described, it may be sufficiently possible to equally apply to the grant-free PUSCH (or configured grant type 1 and type 2).

In addition, the method of the present invention may be implemented in a combination of some or all of the contents contained in each embodiment within a range that does not impair the essence of the invention.

On the other hand, the embodiments of the present invention disclosed in the present specification and drawings are merely presented as specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it is apparent to those of ordinary skill in the art to which the present invention pertains that other modified examples can be implemented based on the technical spirit of the present invention. In addition, each of the above embodiments may be operated in combination with each other as needed. For example, a base station and a terminal may be operated by combining parts of a plurality of embodiments of the present invention. In addition, although the above embodiments have been presented based on the NR system, other modified examples based on the technical idea of the embodiment may be implemented in other systems such as FDD or TDD LTE systems.

In addition, in the present specification and drawings, preferred embodiments of the present invention have been disclosed, and although specific terms are used, these are only used in a general sense to easily explain the technical contents of the present invention and to help the understanding of the present invention, It is not intended to limit the scope of the invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

Claims (1)

A method for processing a control signal of a terminal in a wireless communication system, the method comprising:
Receiving a first control signal transmitted from the base station;
processing the received first control signal; and
and transmitting a second control signal generated based on the processing to the base station.

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