WO2020204560A1 - Method and device for transmitting and receiving wireless signal in wireless communication system - Google Patents

Abstract

The present invention relates to a wireless communication system and, more particularly, to a method and a device therefor, the method comprising the steps of: receiving a PDCCH including scheduling information regarding a plurality of PDSCHs; on the basis of the plurality of PDSCHs being received in a plurality of time units, determining a HARQ-ACK response set for the plurality of PDSCHs; on the basis of the HARQ-ACK response set, selecting one PUCCH resource from among a plurality of PUCCH resources; and transmitting a bit value corresponding to the HARQ-ACK response set by using the selected PUCCH resource.

Description

Method and apparatus for transmitting and receiving wireless signals in a wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving wireless signals.

Wireless communication systems have been widely deployed to provide various types of communication services such as voice and data. In general, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA) system. division multiple access) system.

An object of the present invention is to provide a method and apparatus for efficiently performing a wireless signal transmission/reception process.

The technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description.

As a first aspect of the present invention, in a method for a terminal to transmit a radio signal in a wireless communication system, receiving a physical downlink control channel (PDCCH) including scheduling information about a plurality of physical downlink shared channels (PDSCHs) ; Determining a hybrid automatic repeat request acknowledgment (HARQ-ACK) response set for the plurality of PDSCHs based on the plurality of PDSCHs received in a plurality of time units; Selecting one PUCCH resource from a plurality of physical uplink control channel (PUCCH) resources based on the HARQ-ACK response set; And transmitting a bit value corresponding to the HARQ-ACK response set using the selected PUCCH resource, wherein the plurality of PUCCH resources include an index of a specific control channel element (CCE) used for reception of the PDCCH and A method is provided that is determined based on a combination of a plurality of offsets.

In a second aspect of the present invention, a terminal used in a wireless communication system, comprising: at least one processor; And at least one computer memory operably connected to the at least one processor and allowing the at least one processor to perform an operation when executed, the operation including: a plurality of HARQ-ACK for the plurality of PDSCHs based on receiving a physical downlink control channel (PDCCH) including scheduling information on a physical downlink shared channel (PDSCH), and receiving the plurality of PDSCHs in a plurality of time units (Hybrid automatic repeat request acknowledgment) determines a response set, and, based on the HARQ-ACK response set, selects one PUCCH resource from a plurality of physical uplink control channel (PUCCH) resources, and the HARQ-ACK response set Including transmitting a corresponding bit value using the selected PUCCH resource, the plurality of PUCCH resources are determined based on a combination of a specific CCE (control channel element) index and a plurality of offsets used for reception of the PDCCH do.

In a third aspect of the present invention, an apparatus for a terminal, comprising: at least one processor; And at least one computer memory operably connected to the at least one processor and allowing the at least one processor to perform an operation when executed, the operation comprising: a plurality of HARQ-ACK for the plurality of PDSCHs based on receiving a physical downlink control channel (PDCCH) including scheduling information on a physical downlink shared channel (PDSCH), and receiving the plurality of PDSCHs in a plurality of time units (Hybrid automatic repeat request acknowledgment) determines a response set, and, based on the HARQ-ACK response set, selects one PUCCH resource from a plurality of physical uplink control channel (PUCCH) resources, and the HARQ-ACK response set Including transmitting a corresponding bit value using the selected PUCCH resource, the plurality of PUCCH resources are determined based on a combination of a specific CCE (control channel element) index and a plurality of offsets used for reception of the PDCCH do.

In a fourth aspect of the present invention, there is provided a computer-readable storage medium comprising at least one computer program that, when executed, causes the at least one processor to perform an operation, the operation comprising: a plurality of PDSCHs. Receives a PDCCH (physical downlink control channel) including scheduling information on a (physical downlink shared channel), and HARQ-ACK for the plurality of PDSCHs based on the reception of the plurality of PDSCHs in a plurality of time units ( A hybrid automatic repeat request acknowledgment) response set is determined, and based on the HARQ-ACK response set, one PUCCH resource is selected from a plurality of physical uplink control channel (PUCCH) resources, and corresponding to the HARQ-ACK response set Transmitting a bit value using the selected PUCCH resource, wherein the plurality of PUCCH resources are determined based on a combination of an index of a specific control channel element (CCE) used for reception of the PDCCH and a plurality of offsets. .

Preferably, the plurality of offsets may include a plurality of different integers.

Preferably, the plurality of PUCCH resources are determined based on a value that satisfies {the index of the specific CCE + n*offset}, and n is an integer of 0 to (the number of the plurality of PUCCH resources-1), and the The offset may be an integer other than zero.

Preferably, the plurality of offsets may be determined based on indices of the plurality of time units.

Preferably, the plurality of PUCCH resources may be determined based on a function value of {the index of the specific CCE, the index of each time unit}.

According to the present invention, radio signal transmission and reception can be efficiently performed in a wireless communication system.

The effects that can be obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those of ordinary skill in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description to aid in understanding of the present invention, provide embodiments for the present invention, and together with the detailed description will be described the technical idea of the present invention.

1 illustrates physical channels used in a 3GPP system, which is an example of a wireless communication system, and a general signal transmission method using them.

2 illustrates a structure of a radio frame.

3 illustrates a resource grid of a slot.

4 shows an example in which a physical channel is mapped in a slot.

5 illustrates an ACK/NACK transmission process.

6 illustrates a physical uplink shared channel (PUSCH) transmission process.

7 illustrates an LTE radio frame structure.

8 illustrates the structure of LTE PUCCH (Physical Uplink Control Channel) format 1a/1b.

9-10 illustrate an ACK/NACK resource/transmission process.

11 to 14 illustrate data scheduling and HARQ-ACK feedback.

15-25 illustrate data scheduling and HARQ-ACK feedback according to the present invention.

26 to 27 illustrate a HARQ-ACK feedback process according to the present invention.

28 illustrates an initial access procedure that can be applied to the present invention.

29 illustrates a discontinuous reception (DRX) operation applicable to the present invention.

30 to 33 exemplify a communication system 1 and a wireless device applied to the present invention.

The following technologies include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various wireless access systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with radio technologies such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented with a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and Advanced (LTE-A) is an evolved version of 3GPP LTE. 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE/LTE-A.

As more communication devices require a larger communication capacity, there is a need for improved mobile broadband communication compared to the existing Radio Access Technology (RAT). In addition, massive MTC (Machine Type Communications), which connects multiple devices and objects to provide various services anytime, anywhere, is one of the major issues to be considered in next-generation communications. In addition, a communication system design in consideration of a service/terminal sensitive to reliability and latency is being discussed. As described above, the introduction of the next-generation RAT considering enhanced Mobile BroadBand Communication (eMBB), massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication) is being discussed, and in the present invention, the technology is referred to as NR (New Radio or New RAT) It is called.

In order to clarify the description, 3GPP NR is mainly described, but the technical idea of the present invention is not limited thereto.

In a wireless communication system, a terminal receives information from a base station through a downlink (DL), and the terminal transmits information to the base station through an uplink (UL). The information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist according to the type/use of information transmitted and received by them.

1 is a diagram for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.

In a state in which the power is turned off, the terminal is powered on again or newly enters the cell and performs an initial cell search operation such as synchronizing with the base station in step S101. To this end, the UE receives a Synchronization Signal Block (SSB) from the base station. SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). The terminal synchronizes with the base station based on the PSS/SSS and acquires information such as cell identity (cell identity). In addition, the terminal may acquire intra-cell broadcast information based on the PBCH. Meanwhile, the UE may receive a downlink reference signal (DL RS) in the initial cell search step to check a downlink channel state.

After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to the physical downlink control channel information in step S102 to be more specific. System information can be obtained.

Thereafter, the terminal may perform a random access procedure such as steps S103 to S106 to complete access to the base station. To this end, the UE transmits a preamble through a physical random access channel (PRACH) (S103), and a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Can receive (S104). In the case of contention-based random access, a contention resolution procedure such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) ) Can be performed.

After performing the above-described procedure, the UE receives a physical downlink control channel/physical downlink shared channel (S107) and a physical uplink shared channel (PUSCH) as a general uplink/downlink signal transmission procedure. Physical Uplink Control Channel (PUCCH) transmission (S108) may be performed. Control information transmitted from the UE to the base station is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK/NACK (Hybrid Automatic Repeat and ReQuest Acknowledgement/Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), and the like. CSI includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indication (RI), and the like. UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data are to be transmitted simultaneously. In addition, UCI may be aperiodically transmitted through the PUSCH at the request/instruction of the network.

2 illustrates a structure of a radio frame. In NR, uplink and downlink transmission is composed of frames. Each radio frame has a length of 10 ms and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1ms subframes (Subframe, SF). The subframe is divided into one or more slots, and the number of slots in the subframe depends on Subcarrier Spacing (SCS). Each slot includes 12 or 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols according to a cyclic prefix (CP). When a normal CP is used, each slot includes 14 OFDM symbols. When an extended CP is used, each slot includes 12 OFDM symbols.

Table 1 exemplifies that when a normal CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS.

SCS (15*2^u) N ^slot _symb N ^frame,u _slot N ^subframe,u _slot 15KHz (u=0) 14 10 One 30KHz (u=1) 14 20 2 60KHz (u=2) 14 40 4 120KHz (u=3) 14 80 8 240KHz (u=4) 14 160 16

* N ^slot _symb : number of symbols in slot* N ^frame,u _slot : number of slots in frame

* N ^subframe,u _slot : number of slots in ^subframe

Table 2 exemplifies that when an extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS.

SCS (15*2^u) N ^slot _symb N ^frame,u _slot N ^subframe,u _slot 60KHz (u=2) 12 40 4

The structure of the frame is only an example, and the number of subframes, the number of slots, and the number of symbols in the frame may be variously changed.

In the NR system, OFDM numerology (eg, SCS) may be differently set between a plurality of cells merged into one terminal. Accordingly, the (absolute time) section of the time resource (eg, SF, slot or TTI) (for convenience, collectively referred to as TU (Time Unit)) composed of the same number of symbols may be set differently between the merged cells. Here, the symbol may include an OFDM symbol (or a CP-OFDM symbol), an SC-FDMA symbol (or a Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbol).

NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz/60 kHz, it is dense-urban, lower latency. And a wider carrier bandwidth (wider carrier bandwidth) is supported, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.

The NR frequency band is defined as a frequency range of two types (FR1, FR2). FR1 and FR2 may be configured as shown in Table 3 below. Further, FR2 may mean a millimeter wave (mmW).

Frequency Range designation Corresponding frequency range Subcarrier Spacing FR1 450MHz-7125MHz 15, 30, 60 kHz FR2 24250MHz-52600MHz 60, 120, 240 kHz

3 illustrates a resource grid of a slot. The slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 14 symbols, but in the case of an extended CP, one slot includes 12 symbols. The carrier includes a plurality of subcarriers in the frequency domain. RB (Resource Block) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain. Bandwidth Part (BWP) is defined as a plurality of consecutive physical RBs (PRBs) in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.). The carrier may contain up to N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated to one terminal. Each element in the resource grid is referred to as a resource element (RE), and one complex symbol may be mapped.

4 shows an example in which a physical channel is mapped in a slot. In the NR system, a frame is characterized by a self-contained structure in which all of a DL control channel, DL or UL data, and a UL control channel can be included in one slot. For example, the first N symbols in the slot are used to transmit the DL control channel (eg, PDCCH) (hereinafter, the DL control region), and the last M symbols in the slot are used to transmit the UL control channel (eg, PUCCH). Can (hereinafter, UL control region). N and M are each an integer of 0 or more. A resource region (hereinafter, a data region) between the DL control region and the UL control region may be used for DL data (eg, PDSCH) transmission or UL data (eg, PUSCH) transmission. The GP provides a time gap when the base station and the terminal switch from a transmission mode to a reception mode or a process from a reception mode to a transmission mode. Some symbols at a time point at which the DL to UL is switched in the subframe may be set as GP.

PDCCH carries Downlink Control Information (DCI). For example, PCCCH (i.e., DCI) is a transmission format and resource allocation of a downlink shared channel (DL-SCH), resource allocation information for an uplink shared channel (UL-SCH), paging information for a paging channel (PCH), It carries system information on the DL-SCH, resource allocation information for an upper layer control message such as a random access response transmitted on the PDSCH, a transmission power control command, and activation/release of Configured Scheduling (CS). DCI includes a cyclic redundancy check (CRC), and the CRC is masked/scrambled with various identifiers (eg, Radio Network Temporary Identifier, RNTI) according to the owner or usage of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked with a terminal identifier (eg, Cell-RNTI, C-RNTI). If the PDCCH is for paging, the CRC is masked with P-RNTI (Paging-RNTI). If the PDCCH relates to system information (eg, System Information Block, SIB), the CRC is masked with SI-RNTI (System Information RNTI). If the PDCCH is for a random access response, the CRC is masked with a Random Access-RNTI (RA-RNTI).

PUCCH carries UCI (Uplink Control Information). UCI includes:

-SR (Scheduling Request): This is information used to request UL-SCH resources.

-HARQ (Hybrid Automatic Repeat Request)-ACK (Acknowledgement): This is a response to a downlink data packet (eg, codeword) on the PDSCH. Indicates whether a downlink data packet has been successfully received. HARQ-ACK 1 bit may be transmitted in response to a single codeword, and HARQ-ACK 2 bits may be transmitted in response to two codewords. The HARQ-ACK response includes positive ACK (simply, ACK), negative ACK (NACK), DTX or NACK/DTX. Here, HARQ-ACK is mixed with HARQ ACK/NACK and ACK/NACK.

-CSI (Channel State Information): This is feedback information on a downlink channel. MIMO (Multiple Input Multiple Output)-related feedback information includes a Rank Indicator (RI) and a Precoding Matrix Indicator (PMI).

Table 4 illustrates PUCCH formats. Depending on the PUCCH transmission length, it can be classified into Short PUCCH (formats 0, 2) and Long PUCCH (formats 1, 3, 4).

PUCCH format Length in OFDM symbols N ^PUCCH _symb Number of bits Usage Etc 0 1-2 ≤2 HARQ, SR Sequence selection One 4-14 ≤2 HARQ, [SR] Sequence modulation 2 1-2 >2 HARQ, CSI, [SR] CP-OFDM 3 4-14 >2 HARQ, CSI, [SR] DFT-s-OFDM (no UE multiplexing) 4 4-14 >2 HARQ, CSI, [SR] DFT-s-OFDM(Pre DFT OCC)

5 illustrates an ACK/NACK transmission process. Referring to FIG. 5, the UE may detect a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (eg, DCI formats 1_0, 1_1), and the PDCCH represents a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1). For example, DCI formats 1_0 and 1_1 may include the following information.

-Frequency domain resource assignment: indicates the RB set assigned to the PDSCH

-Time domain resource assignment: K0, indicating the starting position (eg, OFDM symbol index) and length (eg number of OFDM symbols) of the PDSCH in the slot

-PDSCH-to-HARQ_feedback timing indicator: indicates K1

-HARQ process number (4 bits): indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB (Transport Block))

-PUCCH resource indicator (PRI): indicates a PUCCH resource to be used for UCI transmission among a plurality of PUCCH resources in a PUCCH resource set

Thereafter, after receiving the PDSCH in slot #(n+K0) according to the scheduling information of slot #n, the UE may transmit UCI through PUCCH in slot #(n+K1). Here, the UCI includes a HARQ-ACK response for the PDSCH. When the PDSCH is configured to transmit a maximum of 1 TB, the HARQ-ACK response may be configured with 1-bit. When the PDSCH is configured to transmit up to two TBs, the HARQ-ACK response may consist of 2-bits when spatial bundling is not configured, and may consist of 1-bits when spatial bundling is configured. When the HARQ-ACK transmission time point for a plurality of PDSCHs is designated as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for the plurality of PDSCHs.

6 illustrates a PUSCH transmission process. Referring to FIG. 6, the UE may detect the PDCCH in slot #n. Here, the PDCCH includes uplink scheduling information (eg, DCI formats 0_0, 0_1). DCI formats 0_0 and 0_1 may include the following information.

-Frequency domain resource assignment: indicates the RB set assigned to the PUSCH

-Time domain resource assignment: indicates the slot offset K2, the starting position (eg, symbol index) and length (eg number of OFDM symbols) of the PUSCH in the slot. The start symbol and length may be indicated through a Start and Length Indicator Value (SLIV) or may be indicated respectively.

Thereafter, the UE may transmit the PUSCH in slot # (n+K2) according to the scheduling information of slot #n. Here, the PUSCH includes the UL-SCH TB. When the PUCCH transmission time and the PUSCH transmission time overlap, the UCI may be transmitted through the PUSCH (PUSCH piggyback).

Next, a CBG (Code Block Group)-based HARQ process will be described. In the CBG-based HARQ process, data scheduling and the HARQ process accordingly may be performed in units of TB. For example, the terminal may receive information on the number M of codeblock groups per transport block from the base station through a higher layer signal (eg, an RRC signal). Thereafter, the terminal may receive the initial data transmission (via PDSCH) from the base station. Here, the data includes a transport block, the transport block includes a plurality of code blocks, and the plurality of code blocks may be divided into one or more code block groups. Here, some of the code block groups may include ceiling (K/M) code blocks, and the remaining code blocks may include flooring (K/M) code blocks. K represents the number of code blocks in the data. Thereafter, the terminal may feed back codeblock group-based A/N information for data to the base station, and the base station may perform data retransmission based on the codeblock group. A/N information may be transmitted through PUCCH or PUSCH. Here, the A/N information includes a plurality of A/N bits for data, and each A/N bit may represent each A/N response generated in units of a code block group for data. The payload size of A/N information may be kept the same based on M regardless of the number of code block groups constituting data.

NR is supported by a semi-static HARQ-ACK codebook scheme (NR Type-1 HARQ-ACK codebook) and a dynamic HARQ-ACK codebook scheme (NR Type-2 HARQ-ACK codebook). The HARQ-ACK (or, A/N) codebook may be replaced with a HARQ-ACK payload.

When the semi-static A/N codebook scheme is set, the size of the A/N codebook is fixed (to a maximum value) regardless of the actual number of scheduled DL data. Specifically, the (maximum) A/N payload (size) transmitted through one PUCCH in one slot is all the CCs set to the terminal and all DL scheduling slots in which the A/N transmission timing can be indicated ( Alternatively, it may be determined by the number of A/N bits corresponding to a combination of PDSCH transmission slots or PDCCH monitoring slots (hereinafter, bundling window). For example, the DL grant DCI (PDCCH) includes PDSCH-to-A/N timing information, and the PDSCH-to-A/N timing information may have one of a plurality of values (eg, k). For example, when the PDSCH is received in slot #m and the PDSCH-to-A/N timing information in the DL grant DCI (PDCCH) scheduling the PDSCH indicates k, the A/N information for the PDSCH is It can be transmitted in slot #(m+k). For example, it can be given as k ∈ {1, 2, 3, 4, 5, 6, 7, 8}. Meanwhile, when A/N information is transmitted in slot #n, the A/N information may include a maximum A/N possible based on the bundling window. That is, the A/N information of slot #n may include A/N corresponding to slot #(n-k). For example, if k ∈ {1, 2, 3, 4, 5, 6, 7, 8}, the A/N information of slot #n is slot #(n-8)~ regardless of actual DL data reception. Includes A/N corresponding to slot #(n-1) (ie, the maximum number of A/N).

When the dynamic HARQ-ACK codebook scheme is configured, the A/N codebook size varies according to the actual number of scheduled DL data. For example, the A/N codebook size is adaptively changed based on the actually scheduled CC and/or slot. The dynamic HARQ-ACK codebook scheme can reduce the HARQ-ACK payload mismatch between the base station and the terminal by signaling a downlink assignment indicator (DAI) value through DL allocation. DAI includes C-DAI (counter-DAI) and T-DAI (total-DAI). The C-DAI may inform information on the number of DL data currently scheduled DL data, and the T-DAI may inform information on the total number of DL data scheduled so far. Accordingly, the HARQ-ACK codebook may be determined based on the C-DAI/T-DAI value. For example, the HARQ-ACK codebook size is determined based on the T-DAI value, and the position of the HARQ-ACK bit(s) in the HARQ-ACK codebook may be determined based on the C-DAI value (eg, c -The corresponding HARQ-ACK bit(s) may be arranged in the order of increasing the DAI value).

T-DAI may be included in DL allocation only when a plurality of cells (or Component Carrier, CC) are merged. When a plurality of cells are merged, C-DAI represents the {cell, slot} scheduling order value calculated in the cell (or CC)-first method, and specifies the position of the A/N bit in the A/N codebook. Used. T-DAI represents the accumulated value of slot-unit scheduling up to the current slot, and is used to determine the size of the A/N codebook. Specifically, the size of the C-DAI field and the T-DAI field in DL allocation may be 2 bits each. In this case, the value of the C-DAI field (0~3) corresponds to (scheduling order mod 2)-1, and the value of the T-DAI field (0~3) corresponds to (scheduling number mod 2)-1. have.

Whether to use the semi-static HARQ codebook method or the dynamic HARQ codebook method may be pre-configured by higher layer (eg, RRC) signaling.

Next, the resource and HARQ-ACK process used in LTE will be described.

7 illustrates an LTE radio frame structure. LTE supports a type 1 radio frame structure for frequency division duplex (FDD) and a type 2 radio frame structure for time division duplex (TDD).

7(a) illustrates a type 1 radio frame structure. The downlink radio frame consists of 10 subframes, and one subframe consists of 2 slots in the time domain. The time taken for one subframe to be transmitted is referred to as a transmission time interval (TTI). For example, the length of one subframe may be 1 ms, and the length of one slot may be 0.5 ms. One slot includes a plurality of OFDMA symbols in the time domain and includes a plurality of RBs in the frequency domain. The RB may include a plurality of consecutive subcarriers in one slot.

7B illustrates a type 2 radio frame structure. A type 2 radio frame consists of two half frames, and each half frame consists of five subframes. The subframe consists of two slots.

Table 5 exemplifies UL-DL configuration (Uplink-Downlink Configuration, UL-DL Cfg) of subframes in a radio frame in TDD mode.

In Table 5, D represents a downlink subframe, U represents an uplink subframe, and S represents a special subframe.

The special subframe includes a Downlink Pilot TimeSlot (DwPTS), a Guard Period (GP), and an Uplink Pilot TimeSlot (UpPTS). DwPTS is a time interval reserved for downlink transmission, and UpPTS is a time interval reserved for uplink transmission.

8 shows a slot level structure of LTE PUCCH formats 1a/1b. PUCCH formats 1a/1b are used for ACK/NACK transmission. Referring to FIG. 8, 1 bit [b(0)] and 2 bit [b(0)b(1)] ACK/NACK information are respectively BPSK (Binary Phase Shift Keying) and QPSK (Quadrature Phase Shift Keying) modulation schemes According to the modulation, one ACK/NACK modulation symbol is generated (d0). In the ACK/NACK information, each bit [b(i), i=0,1] represents a HARQ response for the corresponding TB, and in case of positive ACK, the corresponding bit is given as 1, and in case of negative ACK (NACK), the corresponding bit Is given as 0. Table 6 shows a modulation table defined for PUCCH formats 1a and 1b in LTE.

PUCCH formats 1a/1b perform cyclic shift (αcs,x) in the frequency domain and spread using orthogonal spreading codes (w0,w1,w2,w3) in the time domain. Since code multiplexing is used in both the frequency and time domains, more terminals can be multiplexed on the same PUCCH RB.

9 shows an example of determining a PUCCH resource for ACK/NACK. In LTE, the PUCCH resource used by the UE to transmit ACK/NACK corresponds to a PDCCH carrying scheduling information for downlink data or a PDCCH indicating SPS release. The PDCCH transmitted to the terminal in each downlink subframe is composed of one or more CCEs. The UE may transmit ACK/NACK through a PUCCH resource corresponding to a specific CCE (eg, the first CCE) among CCEs configuring the corresponding PDCCH.

Referring to FIG. 9, each square represents a CCE in a downlink component carrier (DL CC), and each square represents a PUCCH resource in an uplink component carrier (UL CC). Each PUCCH index corresponds to a PUCCH resource for ACK/NACK. As shown in FIG. 9, assuming that information on the PDSCH is transmitted through the PDCCH composed of CCEs 4-6, the UE ACK/NACK through PUCCH 4 corresponding to CCE 4, which is the first CCE constituting the PDCCH. To transmit.

Specifically, in the LTE(-A) system, the PUCCH resource index is determined as follows.

[Equation 1]

n ⁽¹⁾ _PUCCH = n _CCE + N ⁽¹⁾ _PUCCH

Here, n ⁽¹⁾ _PUCCH represents a resource index of PUCCH format 1a/1b for transmitting ACK/NACK/DTX, N ⁽¹⁾ _PUCCH represents a signaling value transmitted from an upper layer, and n _CCE represents a PDCCH transmission This is the smallest value among the CCE indexes used in. n ⁽¹⁾ _Cyclic shift, an orthogonal spreading code, and a physical resource block (PRB) for PUCCH formats 1a/1b are obtained from the PUCCH.

10 shows a TDD UL ACK/NACK transmission process in a single cell situation.

Referring to FIG. 10, the UE may receive one or more DL transmissions (eg, PDSCH signals) on M DL subframes (SF) (S502_0 to S502_M-1). Each PDSCH signal is used to transmit one or more (eg, two) transport blocks (TB) (or codewords (CW)) according to the transmission mode. In addition, although not shown, in steps S502_0 to S502_M-1, a PDCCH signal requiring an ACK/NACK response, for example, a PDCCH signal indicating SPS release (simply, an SPS release PDCCH signal) may also be received. If the PDSCH signal and/or the SPS release PDCCH signal is present in the M DL subframes, the UE undergoes a process for transmitting ACK/NACK (e.g., ACK/NACK (payload) generation, ACK/NACK resource allocation, etc.) , ACK/NACK is transmitted through one UL subframe corresponding to the M DL subframes (S504). The ACK/NACK includes reception response information for the PDSCH signal and/or the SPS release PDCCH signal of steps S502_0 to S502_M-1.

As described above, in TDD, ACK/NACK for data received in M DL subframes is transmitted through one UL subframe (ie, M DL SF(s): 1 UL SF), and the relationship between them is It is given by the Downlink Association Set Index (DASI).

Table 7 shows DASI (K:{k ₀ ,k ₁ ,...k _M-1 }) defined in LTE(-A). Table 7 shows the interval between a DL subframe associated with itself in terms of a UL subframe transmitting ACK/NACK. Specifically, when there is PDSCH transmission and/or SPS release PDCCH in subframe nk (k∈K), the UE transmits a corresponding ACK/NACK in subframe n.

When operating in the TDD scheme, the UE must transmit an ACK/NACK signal for one or more DL transmissions (eg, PDSCH) received through M DL SFs through one UL SF. A method of transmitting ACK/NACK for a plurality of DL SFs through one UL SF is as follows.

1) HARQ-ACK bundling: ACK/NACK bits for a plurality of data units (eg, PDSCH, SPS release PDCCH, etc.) are combined by a logical operation (eg, a logical-AND operation). For example, when all data units are successfully decoded, the receiving end (eg, the terminal) transmits an ACK signal. On the other hand, if even one of the data units fails to decode (or detect), the receiving end transmits a NACK signal or does not transmit anything.

2) Channel selection: A terminal receiving a plurality of data units (eg, PDSCH, SPS release PDCCH, etc.) occupies a plurality of PUCCH resources for ACK/NACK transmission. The ACK/NACK response for a plurality of data units is identified by a combination of the PUCCH resource used for actual ACK/NACK transmission and the transmitted ACK/NACK content (eg, bit value, QPSK symbol value). The channel selection scheme is also referred to as an ACK/NACK selection scheme and a PUCCH selection scheme.

The channel selection method will be described in more detail. In the channel selection scheme, the UE occupies a plurality of uplink physical channel resources (eg, PUCCH resources) to transmit a multiplexed ACK/NACK signal when receiving a plurality of downlink data. For example, when receiving a plurality of PDSCHs, the UE may occupy the same number of PUCCH resources by using a specific CCE of a PDCCH indicating each PDSCH. In this case, a multiplexed ACK/NACK signal may be transmitted using a combination of which PUCCH resource is selected among a plurality of occupied PUCCH resources and modulation/coded content applied to the selected PUCCH resource.

Table 8 illustrates a mapping table for channel selection defined in the LTE system.

In Table 8, HARQ-ACK(i) represents the HARQ ACK/NACK/DTX response of the i-th data unit (0≦i≦3). HARQ ACK/NACK/DTX response includes ACK, NACK, DTX, and NACK/DTX. NACK/DTX represents NACK or DTX. ACK and NACK represent success and failure of decoding a transport block (equivalent to a code block) transmitted through the PDSCH. Discontinuous Transmission (DTX) indicates failure of PDCCH detection. Up to 4 PUCCH resources (ie, n ⁽¹⁾ _{PUCCH, 0} to n ⁽¹⁾ _{PUCCH, 3} ) may be occupied in relation to each data unit. The multiplexed ACK/NACK is transmitted through one PUCCH resource selected from occupied PUCCH resources. N ⁽¹⁾ _PUCCH,i described in Table 8 represents a PUCCH resource actually used to transmit ACK/NACK. b(0)b(1) represents two bits transmitted through the selected PUCCH resource and is modulated in the QPSK method. For example, when the terminal successfully decodes 4 data units, the terminal transmits (1,1) to the base station through the PUCCH resource connected to n ⁽¹⁾ _PUCCH,1 . Since the PUCCH resource and the QPSK symbol combination is insufficient to represent all possible ACK/NACK assumptions, NACK and DTX are coupled (NACK/DTX, N/D) except in some cases.

Equation 2 illustrates a method of determining a PUCCH resource used in a channel selection method in the existing LTE (see 3GPP TS 36.213 Rel-8, section 10.1). Specifically, when a PDCCH indicating release of a PDSCH or DL SPS is received in a subframe n-ki in a situation where M>1, the PUCCH resource may be determined as follows.

[Equation 2]

n ⁽¹⁾ _PUCCH =(Mi-1)*N _p +i*N _p+1 +n _CCE,i +N ⁽¹⁾ _PUCCH , where

-p is selected from {0, 1, 2, 3} to satisfy Np≤nCCE<Np+1,

-N _p =max{0, flooring[N ^DL _RB *(N ^RB _sc *p-4)/36]}

-n _CCE,i is the first CCE index used for transmission of the corresponding PDCCH in subframe nk _i ,

-N ⁽¹⁾ _PUCCH is a value indicated by the upper layer,

-i is an integer from 0 to (M-1),

-N ^DL _RB is the number of _RBs in the downlink band,

-N ^RB _sc is the number of subcarriers constituting the RB.

Example: Multi-DL scheduling and HARQ-ACK feedback

11 illustrates a HARQ-ACK transmission process for DL data. Referring to FIG. 11, a HARQ-ACK transmission time point corresponding to one DL data is determined as one of values of a preset HARQ-ACK timing set, and the corresponding value may be dynamically indicated through DL allocation. In this case, HARQ-ACK information transmitted in a specific slot may correspond to DL data of several slots. For example, as shown in FIG. 11, four HARQ timings are set in advance by higher layer (eg, RRC) signaling, and the HARQ-ACK transmission time corresponding to the DL data of slot #T is based on the DL allocation information. It may be indicated as one of slots #T+6 to #T+9. In this case, HARQ-ACK corresponding to several DL data may be transmitted in one slot. For example, in slot #T+9, HARQ-ACK information corresponding to DL data of slot #T, slot #T+1, slot #T+2, and/or slot #T+3 may be transmitted.

In addition, even in a CA (carrier aggregation) environment as shown in FIG. 12, HARQ-ACK information corresponding to DL data on multiple CCs (or cells) is included in one specific CC (eg, Primary CC (PCC); or, Primary Cell (PCell)). It can be transmitted in a specific slot on )).

On the other hand, as shown in FIGS. 13 and 14, pneumonology (eg, SCS) or a transmit time interval (TTI) may be different between CCs. Specifically, FIG. 13 shows that the TTI or slot length of the DL data received from CC#1 is relatively shorter than that of CC#2, but HARQ-ACK is transmitted on CC#2 where a longer TTI or longer slot length is supported. This is the case. Conversely, FIG. 14 shows that the TTI or slot length of the DL data received in CC#2 is relatively longer than that of CC#1, but HARQ-ACK is transmitted on CC#1 where a shorter TTI or shorter slot length is supported. This is the case.

Meanwhile, in scheduling DL data of multiple slots as shown in FIG. 11, DCI signaling overhead may occur when DL data of each slot is scheduled by individual DL assignment (eg, DL grant DCI). In order to reduce such DCI signaling overhead, a method of scheduling a plurality of PDSCHs (or TBs) with one DL allocation may be introduced. At this time, each PDSCH (or TB) may be transmitted in units of subframes, slots or mini-slots. In addition, as shown in FIGS. 13 and 14, when cross-carrier scheduling of CC#1 in CC#2 having a relatively small SCS, four slots of the scheduled cell are each scheduled with individual DCI in one slot of the scheduling cell. It is also undesirable in terms of DCI signaling overhead.

Hereinafter, when one DL allocation schedules a plurality of PDSCHs (or TBs) (for convenience, multi-TTI DL scheduling), and each PDSCH (or TB) is transmitted in units of subframes, slots or mini-slots, A HARQ-ACK transmission method corresponding to the corresponding PDSCH(s) is proposed. In this specification, the slot may be replaced by a subframe of an LTE system (eg, MTC or NB-IoT). In addition, the proposal of the present specification can be extended even when each PDSCH is transmitted on a different carrier (or cell) in scheduling PDSCH(s) for one DL allocation. For example, when CC (Component Carrier) #1 and CC#2 are CA (Carrier Aggregation), one DL allocation transmitted from CC#1 can schedule not only the PDSCH on CC#1 but also the PDSCH on CC#2 at the same time. I can. In this specification, this DL allocation is defined as a multi-CC DCI for convenience. Multi-CC DCI is for PDSCH scheduling in multiple CCs, and PDSCHs in a maximum of N (>1) CCs can be scheduled. That is, the number of CCs that can be scheduled by multi-CC DCI is 1 to N. N may be defined in advance or may be set by the base station through higher layer (eg, RRC) signaling. Meanwhile, in the present specification, single-CC DCI refers to DL allocation capable of scheduling only PDSCH in one CC.

For convenience, in the present specification, it is assumed that both C-DAI and T-DAI are included/configured in the DL assignment (eg, DL grant DCI), but the T-DAI is applied to DCI in case of single cell only. May or may not be included.

In this specification, DL allocation means DL scheduling information/channel. For example, DL allocation may mean a DL grant DCI (eg, DCI formats 1_0, 1_1) (see FIG. 5), or may mean a PDCCH carrying the DL grant DCI. Unless specifically distinguished below, DCI may mean DL grant DCI. The DL grant DCI may include information for scheduling a PDSCH. In addition, in this specification, DL data means a DL signal for which HARQ-ACK feedback is required. For example, the DL data may include (i) PDSCH, and (ii) PDCCH indicating DL Semi-Persistent Scheduling (SPS) release.

Meanwhile, in the specification of the HARQ timing in the multi-TTI DCI, the HARQ timing is from a reception end time (eg, slot, symbol) of the multi-TTI DCI, a plurality of PDSCHs scheduled by the multi-TTI DCI Among them, it may mean an offset value up to the end point of the last PDSCH (eg, an ending slot, an ending symbol).

For convenience, in the following description, it is assumed that one TB transmission per PDSCH is possible, or HARQ-ACK bundling is set between TB(s) of the PDSCH, and it is assumed that 1-bit HARQ-ACK information is generated/feedback per PDSCH. do. However, when up to 2 TB transmission per PDSCH is possible and HARQ-ACK bundling is not configured between TBs of the PDSCH, it is assumed that 2-bit HARQ-ACK information is generated/feedback per PDSCH. HARQ-ACK bundling refers to an operation of generating 1-bit HARQ-ACK by applying a logical AND operation to HARQ-ACK bits corresponding to each TB of a PDSCH. The number of TBs that can be transmitted per PDSCH and whether HARQ-ACK bundling is applied may be set for each cell. In addition, in the following description, "Scheduling slot #N in slot #T" or "Scheduling data in slot #N in slot #T" means that data in slot #N is scheduled based on DCI of slot #T. do.

1) Receiver (Entity A; eg, terminal): DAI signaling method when a dynamic codebook (eg, NR Type-2 HARQ-ACK codebook) is set

[Method #1] Increase DAI value by DL allocation unit

As shown in FIG. 15 (multi-TTI DL), C-DAI and T-DAI may increase by 1 for each DCI. In this case, the HARQ-ACK codebook size may be determined based on the maximum number (N) of PDSCHs (or slots, TBs, mini-slots) that the multi-TTI DCI can schedule. Here, the N value is defined in advance (e.g., when the SCS of the scheduling cell is SC1 and the SCS of the scheduled cell is SC2 (>= SC1), the N value is determined as SC2/SC1 or less), or higher It can be set by layer (eg, RRC) signaling. In FIG. 15, since the T-DAI value of the last multi-TTI DL allocation is 1, a (2*N)-bit HARQ-ACK codebook can be configured. On the other hand, in relation to the N-bit HARQ-ACK corresponding to each DAI value, if the number of actually scheduled PDSCHs is K (<N), the first (i.e., MSB) K bit among N bits corresponds to the scheduled PDSCH. HARQ-ACK information may be carried, and NACK information may be carried in the remaining (ie, LSB) NK bit(s). If the N value is equal to the maximum number of HARQ process IDs set in the corresponding cell, the N-bit HARQ-ACK corresponding to each DAI value may be configured as a bitmap corresponding to the HARQ process index. That is, each bit of the N-bit HARQ-ACK may indicate HARQ-ACK information for the corresponding HARQ process ID. At this time, in relation to the N-bit HARQ-ACK, when the number of actually scheduled PDSCHs is K (<N), HARQ-ACK information corresponding to the K bit corresponding to the actually scheduled HARQ process ID, not the first K bit Is carried, and NACK information may be carried on the remaining NK bit(s).

As shown in FIG. 16 (single-CC or multi-CC DL), C-DAI and T-DAI may increase by 1 for each DCI. In this case, the HARQ-ACK codebook size may be determined by the maximum number (N) of CCs that the DCI can schedule. Here, the N value may be defined in advance or may be set by higher layer (eg, RRC) signaling. In FIG. 16, since the T-DAI value is 1, a (2*N)-bit HARQ-ACK codebook may be configured. On the other hand, with respect to the N-bit HARQ-ACK corresponding to each DAI value, if the number of actually scheduled CCs is K (<N), the first (i.e., MSB) K bit of the N bits is the scheduled C(s) HARQ-ACK information corresponding to the upper PDSCH (e.g., '1' for ACK, '0' for NACK) is carried, and the remaining (i.e., LSB) NK bits (two) are NACK information (e.g., '0') Can be loaded. If the N value is equal to the maximum number of HARQ process IDs set in the corresponding cell, the N-bit HARQ-ACK corresponding to each DAI value may be configured as a bitmap corresponding to the HARQ process index. That is, each bit of the N-bit HARQ-ACK may indicate HARQ-ACK information for the corresponding HARQ process ID. At this time, in relation to the N-bit HARQ-ACK, when the number of actually scheduled PDSCHs is K (<N), HARQ-ACK information corresponding to the K bit corresponding to the actually scheduled HARQ process ID, not the first K bit Is carried, and NACK information may be carried on the remaining NK bit(s).

In addition, the same HARQ-ACK codebook can be configured with HARQ-ACK information for a plurality of PDSCHs scheduled with multi-TTI DL allocation and one PDSCH scheduled with single-TTI DL allocation even in one CC as shown in FIG. have. In addition, the same HARQ-ACK codebook may be configured with HARQ-ACK information for PDSCHs on different CCs. At this time, the maximum number (N) of PDSCHs (or slots, TBs, mini-slots) that can be scheduled by the multi-TTI DCI may be set differently for each CC (or BWP). Accordingly, the HARQ-ACK codebook size may be determined based on a maximum value among N values for each configured CC (or BWP). If CBG is set in a specific CC (or BWP), the HARQ-ACK codebook size may be determined based on a maximum value among N * CBG values per CC (or BWP). In FIG. 17, if the N value set in CC#1 is 4 and the N value set in CC#2 is 2, the T-DAI value is 2, so 4 (the maximum value among the N values set in CC#1 and CC#2) * A 3-bit HARQ-ACK codebook may be configured.

Alternatively, multiple PDSCHs scheduled by multi-TTI DL allocation in one CC and single-TTI DL allocation (e.g., fallback DCI (e.g., DCI format 1_0)); when only one PDSCH is actually scheduled by multi-TTI DL allocation ), a rule may be set to configure a separate (sub-) codebook for one PDSCH. As an example, in a case where a multi-TTI DCI is configured only when scheduling PDSCH on CC#1 in a 2 CC CA situation, only HARQ-ACK information corresponding to PDSCHs scheduled by a multi-TTI DCI scheduling PDSCH on CC#1 A sub-codebook #1 is created, and only HARQ-ACK information corresponding to the PDSCHs scheduled by the PDSCH scheduled by the single-TTI DL DCI scheduling PDSCH on CC#1 and the PDSCH scheduled by DL allocation scheduling the PDSCH on CC#2 -Can make codebook #2. Thereafter, the terminal may configure and transmit the sub-codebook #1 and sub-codebook #2 as one codebook. Here, the meaning of configuring different sub-codebooks may mean that a method of counting (or indexing) DAI values is performed for each sub-codebook.

The same HARQ-ACK codebook with HARQ-ACK information for a plurality of PDSCHs scheduled by multi-CC DL allocation even in one CC and HARQ-ACK information for one PDSCH scheduled by single-CC DL allocation as shown in FIG. 18 Can be configured. In addition, the same HARQ-ACK codebook may be configured with HARQ-ACK information for PDSCHs on different CCs. In this case, the maximum number (N) of CCs that the multi-CC DCI can schedule may be set differently for each CC (or BWP). Accordingly, the HARQ-ACK codebook size may be determined based on a maximum value among N values for each configured CC (or BWP). If CBG is set for a specific CC (or BWP), the HARQ-ACK codebook size may be determined by a maximum value among N * CBG values per CC (or BWP). In FIG. 18, if the N value set in CC#1 is 2 and the N value set in CC#3 is 1, the T-DAI value is 2, so 2 (the maximum value among the N values set in CC#1 and CC#3) * A 3-bit HARQ-ACK codebook may be configured.

Alternatively, multiple PDSCHs and single-CC DLs scheduled by multi-CC DL allocation even in one CC (e.g., fallback DCI (e.g., DCI format 1_0)); when only one PDSCH is actually scheduled by multi-TTI DL allocation ), a rule may be set to configure a separate (sub-) codebook for one PDSCH. For example, in a case where a multi-CC DL DCI is configured only when scheduling a PDSCH on CC#1 in a 3 CC CA situation, a HARQ-ACK corresponding to PDSCHs scheduled by a multi-CC DL DCI scheduling a PDSCH on CC#1 Only the HARQ-ACK information corresponding to the PDSCH scheduled by the PDSCH scheduled by the single-CC DL DCI scheduling the PDSCH on the CC#1 and the DL allocation scheduling the CC#3 PDSCH, and the sub-codebook #1 created with only information Sub-codebook #2 can be created. Sub-codebook #1 and sub-codebook #2 may be configured as one codebook and transmitted. Here, the meaning of configuring different sub-codebooks may mean that a method of counting (or indexing) DAI values is performed for each sub-codebook.

In addition, even if the maximum number (N) of PDSCHs (or slots, TBs, mini-slots) that the multi-TTI DCI can schedule is set, only the number of PDSCHs smaller than N will be scheduled through the multi-TTI DCI. I can. In this case, a slot in which a multi-TTI DCI can be scheduled may be scheduled by a separate DCI, and HARQ-ACK timing corresponding to a PDSCH scheduled by two DCIs may be the same. In this case, corresponding to the C-DAI, HARQ-ACK transmission of a size smaller than N-bit may be allowed. As an example, when N=4 is set as shown in FIG. 19, the set of slots that can be scheduled by multi-TTI DCI of slot #T is {slot #T, slot #T+1, slot #T+2, slot# T+3}, in which the PDSCH can be scheduled through a separate DCI in slot #T+3. In this case, in order to reduce duplication of HARQ-ACK information corresponding to slot #T+3, the HARQ-ACK codebook corresponding to C-DAI=0 is 3 bits, and the HARQ-ACK codebook corresponding to C-DAI=1 is It can be composed of 4 bits. In addition, some of the slots (or mini-slots) in which the multi-TTI DCI can be scheduled may be difficult to transmit HARQ-ACK due to insufficient processing time margin at the indicated HARQ-ACK transmission timing. In this case, HARQ-ACK information corresponding to the corresponding slot (or mini-slot) may be excluded from the codebook configuration. As an example, a set of slots that can be scheduled by multi-TTI DCI of slot #T+3 is {slot #T+3, slot #T+4, slot #T+5, slot #T+6}, and HARQ-ACK The transmission time may be indicated by slot #T+9. At this time, if it is impossible to transmit the HARQ-ACK corresponding to the PDSCH after slot #T+5 in slot #T+9 due to the UE processing time capability, the HARQ-ACK codebook corresponding to C-DAI=1 is (slot It may consist of only 2 bits) except for HARQ-ACK information corresponding to #T+5/T+6.

[Method #2] Increase the DAI value in units of PDSCH (or TB)

In [Method #1], since the HARQ-ACK size corresponding to the C-DAI is determined as an N value (or a maximum value among N values per cell), more HARQ-ACK information than the actually scheduled number of PDSCHs may be fed back. To solve this, the DAI value may be increased by 1 for each PDSCH unit. Alternatively, the DAI value may be increased by 1 for each number of CCs scheduled by multi-CC DL allocation.

For example, as shown in FIG. 20, the DAI value may be increased for each PDSCH, and since a total of 4 PDSCHs have been scheduled, 4-bit HARQ-ACK information may be fed back. At this time, in the example of FIG. 20, the C-DAI and T-DAI values are calculated based on the DCI transmission slot, but the C-DAI and/or T-DAI values are the latest slot among the PDSCH(s) scheduled by DCI. It can be calculated based on (or mini-slot). For example, the C-DAI may be calculated based on the DCI transmission slot, and the T-DAI may be calculated based on the latest slot (or mini-slot) among PDSCHs scheduled by DCI. In this case, referring to FIG. 20, C-DAI=0/T-DAI=1 may be signaled in slot #T, and C-DAI=2/T-DAI=3 may be signaled in slot #T+3. .

As shown in FIG. 21, the DAI value may increase for each CC, and since PDSCHs are scheduled on a total of 4 CCs (2 CC#1, 2 CC#2), 4-bit HARQ-ACK information may be fed back. At this time, in the example of FIG. 21, both C-DAI and T-DAI values are calculated based on the DAI value in the scheduling DCI transmission CC, but the C-DAI and/or T-DAI values are the CC(s) scheduled in the DCI. Among them, the DAI value may be calculated based on a specific CC (eg, the largest CC index or the smallest CC index). As an example, when the C-DAI and T-DAI of the multi-CC DCI are calculated based on CC#2 in the scheduling DCI transmission slot, C-DAI=2, T-DAI in slot#T+2 May be signaled as =2.

Meanwhile, in the existing NR, each DAI field is limited to 2 bits in consideration of the DCI missing case, but if a plurality of PDSCHs can be scheduled in each DCI, the DCI missing case may have a greater effect on the DAI. In consideration of this, the DAI field size of the multi-TTI (or multi-CC) DCI may be larger than the existing (eg, 2 bits). For example, the DAI field size of the multi-TTI (or multi-CC) DCI may be determined as 2 + ceiling{log ₂ (the maximum value among N values for each CC (or BWP) set in the same cell group)}. Here, ceiling {X} means the smallest integer value among integers greater than or equal to X. In this way, the DAI field with an increased size is applied only to Opt1) multi-TTI (or multi-CC) DL allocation and single-TTI (or, single-CC) DL allocation (e.g., fallback DCI (e.g., DCI format) 1_0); does not apply to multi-TTI (or multi-CC) DL allocation when only one PDSCH is actually scheduled), or Opt2) multi-TTI (or multi-CC) DL allocation as well as single-TTI (Or, single-CC) DL allocation (e.g., fallback DCI (e.g., DCI format 1_0); multi-TTI (or, multi-CC) can be applied in common when only one PDSCH is actually scheduled by DL allocation) . In the case of Opt1, multiple PDSCHs scheduled by multi-TTI (or multi-CC) DL allocation even in one CC (or slot) and single-TTI DL allocation (eg, fallback DCI (eg, DCI format 1_0)); The HARQ-ACK information for one PDSCH scheduled in the multi-TTI (or multi-CC) DL allocation, when only one PDSCH is actually scheduled), may be configured to consist of a separate (sub-) codebook. have. In the case of Opt2, even in one CC (or slot), a plurality of PDSCHs scheduled with multi-TTI (or multi-CC) DL allocation and a single-TTI (or single-CC) DL allocation (e.g., fallback DCI ( For example, DCI format 1_0); A rule may be configured to configure one PDSCH scheduled with a multi-TTI (or multi-CC) DL allocation to actually schedule only one PDSCH as one codebook.

Meanwhile, HARQ-ACK information corresponding to a plurality of PDSCHs scheduled by one multi-TTI DCI may be transmitted through a plurality of UL channels rather than one UL channel (eg, PUCCH, PUSCH). As an example, similar to the LTE TDD system, when the HARQ-ACK transmission timing for each PDSCH is previously defined or configured, a (partial) UL slot may be located between DL slots (or subframes), and the corresponding UL slot HARQ-ACK information corresponding to some PDSCH(s) among a plurality of PDSCHs scheduled by one multi-TTI DCI may be fed back. Considering that the DAI corresponding to different HARQ-ACK feedback opportunities must be calculated separately, there is no discrepancy in the size of the HARQ-ACK codebook, corresponding to some of the PDSCHs scheduled by one multi-TTI DCI If the HARQ-ACK information is fed back first, it is proposed that the DAI for the remaining PDSCH should be counted again from 0.

For example, as shown in FIG. 22, although the PDSCH of 3 slots (eg, slot #T/T+1/T+4) is scheduled in slot #T, HARQ- corresponding to the PDSCH of slot #T/T+1 ACK may be preferentially fed back in slot #T+3. In this case, the UE may recognize the C-DAI corresponding to the PDSCH of slot #T+4 as 0 instead of 2. Accordingly, the base station may signal a next C-DAI value of 1 in a multi-TTI DCI scheduling a subsequent DL allocation, that is, a PDSCH of slot #T+6. Alternatively, a case in which a (partial) UL slot may be located between DL slots (or subframes) and a plurality of PDSCHs scheduled by one multi-TTI DCI is not consecutive in time due to the corresponding UL slot does not occur. To this end, the maximum number of PDSCHs that can be scheduled by the multi-TTI DCI may be limited to the maximum number of DL slots that can be contiguous in a corresponding cell. For example, in the LTE TDD system, the maximum number of PDSCHs that the multi-TTI DCI can schedule may be limited by the number of consecutive DL subframes for each DL/UL configuration. In addition, in scheduling a plurality of TBs in a multi-TTI DCI, one TB is repeatedly transmitted (or transmitted by changing an additional redundancy version (RV)) in a plurality of slots (or subframes, mini-slots). Can be scheduled. In this case, it is assumed that PDSCHs on a plurality of slots (or subframes, mini-slots) corresponding to the same TB have one DAI value, and the same rules as in FIG. 22 may be applied. As an example, as shown in FIG. 23, when two TBs are scheduled in slot #T and each TB is transmitted while changing the RV value over two slots, the terminal sets 1 C-DAI corresponding to the PDSCH of slot #T+5. It can be recognized as 0. Accordingly, the base station may signal a next C-DAI value of 1 in a multi-TTI DCI scheduling a subsequent DL allocation, that is, a PDSCH of slot #T+6.

In addition, when there is no DCI and PDSCH on slot #T+6 and slot #T+7 in FIG. 22, the UE feedbacks HARQ-ACK information corresponding to the PDSCH of slot #T+4 in slot #T+9 can do. In this case, the resource used to feed back HARQ-ACK information in slot #T+9 may be signaled by the DCI of slot #T scheduling the PDSCH of slot #T+9. That is, in transmitting HARQ-ACK information corresponding to a plurality of PDSCHs scheduled by the DCI of slot #T in slot #T+3 and slot #T+9, it is used to transmit HARQ-ACK information in each slot. The resource may be signaled by the DCI of slot #T. For example, resource candidates for HARQ-ACK feedback are set through RRC signaling, and one of the resource candidates may be indicated through multi-TTI DCI. Here, the resource candidate may include a PUCCH resource candidate. In this case, the resource indicated through the multi-TTI DCI may be commonly applied to slot #T+3 and slot #T+9. Alternatively, in setting resource candidates for HARQ-ACK feedback through RRC signaling, resource candidate groups are set, and one of the resource candidate groups may be indicated through multi-TTI DCI. Here, the resource candidate group includes resource candidates of each slot. For example, one resource candidate group may be set to resource A in a first slot and resource B in a second slot.

On the other hand, when a plurality of PDSCHs are scheduled by multi-TTI DCI, a resource containing HARQ-ACK information for a plurality of PDSCHs (eg, PUCCH resource) is a slot index and/or a specific CCE index of the PDCCH (eg, the smallest CCE index) can be determined in association with. For example, in the case of LTE PUCCH format 1b with channel selection (refer to Table 8), PUCCH resources are determined by a function of a subframe index through which the PDCCH is transmitted and the smallest CCE index of the corresponding PDCCH. However, when DCI scheduling the PDSCH of slot #T/T+1/T+2 is received in slot #T, as shown in FIG. 24, a method of determining a resource containing HARQ-ACK information transmitted in slot #T+4 Suggest.

-Alt. 1: When a specific CCE index (e.g., the first or smallest CCE index) in which a multi-TTI DCI is received in slot #T is defined as CCE1, (slot #T and CCE1, slot #T and CCE1+alpha, slot A resource containing HARQ-ACK information transmitted in slot #T+4 may be determined by a function of #T and CCE1+2*alpha}. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

■ For example, three PUCCH resource indexes on slot #T+4 linked to three CCE indexes {CCE1, CCE1+alpha, CCE1+2*alpha} of slot #T are, slot #T/T+1/T It can be used to determine PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK transmission for a PDSCH of +2. For example, three PUCCH resource indexes on slot #T+4 can be obtained by replacing n _CCE,i in Equation 2 with {CCE1, CCE1+alpha, CCE1+2*alpha}. In addition, i in Equation 2 may be replaced with a value corresponding to slot #T+5. For example, a value corresponding to slot #T may be given as 0, a slot index, or (slot index mod X). X is a positive integer.

-Alt. 2: When a specific CCE index (e.g., the first or smallest CCE index) in which the multi-TTI DCI was received in slot #T is defined as CCE1, (slot #T and CCE1, slot #T+1 and CCE1, slot A resource containing HARQ-ACK information transmitted in slot #T+4 may be determined by a function of #T+2 and CCE1}.

■ For example, 3 PUCCH resource indexes on slot #T+4 linked to {CCE index CCE1 on slot #T, CCE index CCE1 on slot #T+1, CCE index CCE1 on slot #T+2} It may be used to determine PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK transmission for PDSCH of #T/T+1/T+2. For example, the three PUCCH resource indexes on slot #T+4 can be obtained by replacing i in Equation 2 with a value corresponding to {slot #T, slot #T+1, slot #T+2}. . For example, a value corresponding to {slot #T, slot #T+1, slot #T+2} may be given as 0-2, a slot index, or (slot index mod X). X is a positive integer.

Based on PUCCH format 1b with channel selection, the UE determines A/N states for a plurality of PDSCHs, and selects/modulates a specific one of a plurality of PUCCH format 1b resources according to the A/N state to provide A/N information. Can be transmitted.

In addition, when DCI scheduling DL data (eg, PDSCH) of slot #T+5/T+6/T+7 is received in slot #T, HARQ- transmitted in slot #T+9 as shown in FIG. 24 We propose a method for determining a resource containing ACK information.

-Alt. A: When a specific CCE index (e.g., the first or smallest CCE index) in which the multi-TTI DCI is received in slot #T is defined as CCE1, (slot #T+5 and CCE1, slot #T+5 and CCE1) A resource containing HARQ-ACK information transmitted in slot #T+9 may be determined by a function of +alpha, slot #T+5, and CCE1+2*alpha}. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

■ For example, three PUCCH resource indexes on slot #T+9 linked to three CCE indexes {CCE1, CCE1+alpha, CCE1+2*alpha} of slot #T+5 are, slot #T+5/T It may be used to determine PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK transmission for +6/T+7 DL data (eg, PDSCH). For example, three PUCCH resource indexes on slot #T+9 can be obtained by replacing n _CCE,i in Equation 2 with {CCE1, CCE1+alpha, CCE1+2*alpha}. In addition, i in Equation 2 may be replaced with a value corresponding to slot #T+5. For example, a value corresponding to slot #T+5 may be given as 0, a slot index, or (slot index mod X). X is a positive integer.

-Alt. B: When a specific CCE index (e.g., the first or smallest CCE index) in which the multi-TTI DCI is received in slot #T is defined as CCE1, (slot #T+5 and CCE1, slot #T+6 and CCE1) , A resource containing HARQ-ACK information transmitted in slot #T+9 may be determined by a function of slot #T+7 and CCE1}.

■ As an example, three PUCCH resource indexes on slot #T+9 linked to {CCE index CCE1 of slot #T+5, CCE index CCE1 of slot #T+6, CCE index CCE1 of slot #T+7} , It can be used to determine PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK transmission for DL data (eg, PDSCH) of slot #T+5/T+6/T+7. For example, the three PUCCH resource indexes on slot #T+4 can be obtained by replacing i in Equation 2 with values corresponding to {slot #T+5, slot #T+6, slot #T+7}. I can. For example, a value corresponding to {slot #T+5, slot #T+6, slot #T+7} may be given as 0-2, a slot index, or (slot index mod X). X is a positive integer.

In addition, in scheduling a plurality of TBs in a multi-TTI DCI, one TB is repeatedly transmitted (or transmitted by changing an additional redundancy version (RV)) in a plurality of slots (or subframes, mini-slots). Can be scheduled. As an example, as shown in FIG. 25, while scheduling 4 TBs in slot #T, it is possible to instruct each TB to be transmitted while changing the RV value over 2 slots, and in this case, the same rule as in FIG. 24 may be applied. Specifically, a method of determining a resource containing HARQ-ACK information transmitted in slot #T+5 is proposed.

-Alt. 1': When a specific CCE index (eg, the first or smallest CCE index) in which a multi-TTI DCI was received in slot #T is defined as CCE1, {slot #T and CCE1, slot #T and CCE1+alpha} A resource containing HARQ-ACK information transmitted in slot #T+5 may be determined by a function of. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

-Alt. 2': When defining a specific CCE index (eg, the first or smallest CCE index) in which the multi-TTI DCI is received in slot #T as CCE1, {(slot #T or slot #T+1) and CCE1; A resource containing HARQ-ACK information transmitted in slot #T+5 may be determined by a function of (slot #T+2 or slot #T+3) and CCE1}.

In addition, HARQ-ACK information transmitted in slot #T+11 when DCI scheduling the PDSCH of slot #T+6/T+7/T+8/T+9 is received in slot #T as shown in FIG. 25 Suggests a method for determining the resources to contain.

-Alt. A': When a specific CCE index (eg, the first or smallest CCE index) in which the multi-TTI DCI is received in slot #T is defined as CCE1, (slot #T+6 and CCE1, slot #T+6 and A resource containing HARQ-ACK information transmitted in slot #T+11 may be determined by a function of CCE1+alpha}. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

-Alt. B': When defining a specific CCE index (eg, the first or smallest CCE index) at which the multi-TTI DCI was received in slot #T as CCE1, ((slot #T+6 or slot #T+7) and CCE1; A resource containing HARQ-ACK information transmitted in slot #T+11 may be determined by a function of (slot #T+8 or slot #T+9) and CCE1}.

2) Transmitter (Entity B; eg, base station): DAI signaling method when dynamic codebook (eg, Type-2 HARQ-ACK codebook in NR system) is set

[Method #1A] Increase DAI value by DL allocation unit

As shown in FIG. 15 (multi-TTI DL), C-DAI and T-DAI may increase by 1 for each DCI. In this case, the HARQ-ACK codebook size may be determined based on the maximum number (N) of PDSCHs (or slots, TBs, mini-slots) that the multi-TTI DCI can schedule. Here, the N value is defined in advance (e.g., when the SCS of the scheduling cell is SC1 and the SCS of the scheduled cell is SC2 (>= SC1), the N value is determined as SC2/SC1 or less), or higher It can be set by layer (eg, RRC) signaling. In FIG. 15, since the T-DAI value of the last multi-TTI DL allocation is 1, the base station can expect that the (2*N)-bit HARQ-ACK codebook is configured and fed back. On the other hand, in relation to the N-bit HARQ-ACK corresponding to each DAI value, if the number of actually scheduled PDSCHs is K (<N), the first (i.e., MSB) K bit among N bits corresponds to the scheduled PDSCH. HARQ-ACK information may be carried, and NACK information may be carried in the remaining (ie, LSB) NK bit(s). If the N value is equal to the maximum number of HARQ process IDs set in the corresponding cell, the N-bit HARQ-ACK corresponding to each DAI value may be configured as a bitmap corresponding to the HARQ process index. That is, each bit of the N-bit HARQ-ACK may indicate HARQ-ACK information for the corresponding HARQ process ID. At this time, in relation to the N-bit HARQ-ACK, when the number of actually scheduled PDSCHs is K (<N), HARQ-ACK information corresponding to the K bit corresponding to the actually scheduled HARQ process ID, not the first K bit Is carried, and NACK information may be carried on the remaining NK bit(s).

As shown in FIG. 16 (single-CC or multi-CC DL), C-DAI and T-DAI may increase by 1 for each DCI. In this case, the HARQ-ACK codebook size may be determined by the maximum number (N) of CCs that the DCI can schedule. Here, the N value may be defined in advance or may be set by higher layer (eg, RRC) signaling. In FIG. 16, since the T-DAI value is 1, the base station can expect that a (2*N)-bit HARQ-ACK codebook is configured and fed back. On the other hand, with respect to the N-bit HARQ-ACK corresponding to each DAI value, if the number of actually scheduled CCs is K (<N), the first (i.e., MSB) K bit of the N bits is the scheduled C(s) HARQ-ACK information corresponding to the upper PDSCH (e.g., '1' for ACK, '0' for NACK) is carried, and the remaining (i.e., LSB) NK bits (two) are NACK information (e.g., '0') Can be loaded. If the N value is equal to the maximum number of HARQ process IDs set in the corresponding cell, the N-bit HARQ-ACK corresponding to each DAI value may be configured as a bitmap corresponding to the HARQ process index. That is, each bit of the N-bit HARQ-ACK may indicate HARQ-ACK information for the corresponding HARQ process ID. At this time, in relation to the N-bit HARQ-ACK, when the number of actually scheduled PDSCHs is K (<N), HARQ-ACK information corresponding to the K bit corresponding to the actually scheduled HARQ process ID, not the first K bit Is carried, and NACK information may be carried on the remaining NK bit(s).

In addition, the same HARQ-ACK codebook can be configured with HARQ-ACK information for a plurality of PDSCHs scheduled with multi-TTI DL allocation and one PDSCH scheduled with single-TTI DL allocation even in one CC as shown in FIG. have. In addition, the same HARQ-ACK codebook may be configured with HARQ-ACK information for PDSCHs on different CCs. At this time, the maximum number (N) of PDSCHs (or slots, TBs, mini-slots) that can be scheduled by the multi-TTI DCI may be set differently for each CC (or BWP). Accordingly, the HARQ-ACK codebook size may be determined based on a maximum value among N values for each configured CC (or BWP). If CBG is set for a specific CC (or BWP), the HARQ-ACK codebook size may be determined based on a maximum value among N * CBG values per CC (or BWP). In FIG. 17, if the N value set in CC#1 is 4 and the N value set in CC#2 is 2, the T-DAI value is 2, so 4 (the maximum value among the N values set in CC#1 and CC#2) * The base station can expect that a 3-bit HARQ-ACK codebook is configured and fed back.

Alternatively, multiple PDSCHs scheduled by multi-TTI DL allocation in one CC and single-TTI DL allocation (e.g., fallback DCI (e.g., DCI format 1_0)); when only one PDSCH is actually scheduled by multi-TTI DL allocation ), a rule may be set to configure a separate (sub-) codebook for one PDSCH. As an example, in a case where a multi-TTI DCI is configured only when scheduling PDSCH on CC#1 in a 2 CC CA situation, only HARQ-ACK information corresponding to PDSCHs scheduled by a multi-TTI DCI scheduling PDSCH on CC#1 Sub-codebook #1 is configured, and only HARQ-ACK information corresponding to PDSCHs scheduled by a single-TTI DL DCI scheduling PDSCH on CC#1 and a DL allocation scheduling PDSCH on CC#2 Sub-codebook #2 may be configured. The base station can expect that sub-codebook #1 and sub-codebook #2 are configured as one codebook and fed back. Here, counting (or indexing) for the DAI value may be performed for each sub-codebook.

The same HARQ-ACK codebook with HARQ-ACK information for a plurality of PDSCHs scheduled by multi-CC DL allocation even in one CC and HARQ-ACK information for one PDSCH scheduled by single-CC DL allocation as shown in FIG. 18 This can be configured. In addition, the same HARQ-ACK codebook may be configured with HARQ-ACK information for PDSCHs on different CCs. In this case, the maximum number (N) of CCs that the multi-CC DCI can schedule may be set differently for each CC (or BWP). Accordingly, the HARQ-ACK codebook size may be determined based on a maximum value among N values for each configured CC (or BWP). If CBG is set for a specific CC (or BWP), the HARQ-ACK codebook size may be determined by a maximum value among N * CBG values per CC (or BWP). In FIG. 18, if the N value set in CC#1 is 2 and the N value set in CC#3 is 1, the T-DAI value is 2, so 2 (the maximum value among the N values set in CC#1 and CC#3) * The base station can expect that a 3-bit HARQ-ACK codebook is configured and fed back.

Alternatively, multiple PDSCHs and single-CC DLs scheduled by multi-CC DL allocation even in one CC (e.g., fallback DCI (e.g., DCI format 1_0)); when only one PDSCH is actually scheduled by multi-TTI DL allocation ), a rule may be set to configure a separate (sub-) codebook for one PDSCH. For example, in a case where a multi-CC DL DCI is configured only when scheduling a PDSCH on CC#1 in a 3 CC CA situation, a HARQ-ACK corresponding to PDSCHs scheduled by a multi-CC DL DCI scheduling a PDSCH on CC#1 Only the HARQ-ACK information corresponding to the PDSCH scheduled by the PDSCH scheduled by the single-CC DL DCI scheduling the PDSCH on the CC#1 and the DL allocation scheduling the CC#3 PDSCH, and the sub-codebook #1 created with only information Sub-codebook #2 can be created. The base station can expect that sub-codebook #1 and sub-codebook #2 are configured as one codebook and fed back. Here, counting (or indexing) for the DAI value may be performed for each sub-codebook.

In addition, even if the maximum number (N) of PDSCHs (or slots, TBs, mini-slots) that the multi-TTI DCI can schedule is set, only the number of PDSCHs smaller than N will be scheduled through the multi-TTI DCI. I can. In this case, a slot in which a multi-TTI DCI can be scheduled may be scheduled by a separate DCI, and HARQ-ACK timing corresponding to a PDSCH scheduled by two DCIs may be the same. In this case, in response to C-DAI, HARQ-ACK feedback having a size smaller than N-bit may be allowed. For example, when N=4 is set as shown in FIG. 19, the set of slots that can be scheduled by multi-TTI DCI of slot #T is {slot #T, slot #T+1, slot #T+2, slot# T+3}, in which the PDSCH can be scheduled through a separate DCI in slot #T+3. In this case, in order to reduce duplication of HARQ-ACK information corresponding to slot #T+3, the HARQ-ACK codebook corresponding to C-DAI=0 is 3 bits, and the HARQ-ACK codebook corresponding to C-DAI=1 is The base station can expect to be composed of 4 bits. In addition, some of the slots (or mini-slots) in which the multi-TTI DCI can be scheduled may be difficult to transmit HARQ-ACK due to insufficient processing time margin at the indicated HARQ-ACK transmission timing. In this case, HARQ-ACK information corresponding to the corresponding slot (or mini-slot) may be excluded from the codebook configuration. As an example, a set of slots that can be scheduled by multi-TTI DCI of slot #T+3 is {slot #T+3, slot #T+4, slot #T+5, slot #T+6}, and HARQ-ACK The transmission time may be indicated by slot #T+9. At this time, if it is impossible to transmit the HARQ-ACK corresponding to the PDSCH after slot #T+5 in slot #T+9 due to the UE processing time capability, the HARQ-ACK codebook corresponding to C-DAI=1 is (slot Except for HARQ-ACK information corresponding to #T+5/T+6), the base station can expect that it consists of only 2 bits.

[Method #2A] Increase the DAI value in units of PDSCH (or TB)

In [Method #1A], since the HARQ-ACK size corresponding to the C-DAI is determined as an N value (or a maximum value among N values per cell), more HARQ-ACK information than the actually scheduled number of PDSCHs may be fed back. To solve this, the DAI value may be increased by 1 for each PDSCH unit. Alternatively, the DAI value may be increased by 1 for each number of CCs scheduled by multi-CC DL allocation.

For example, as shown in FIG. 20, the DAI value may be increased for each PDSCH, and since a total of 4 PDSCHs have been scheduled, the base station can expect that 4-bit HARQ-ACK information is fed back. At this time, in the example of FIG. 20, the C-DAI and T-DAI values are calculated based on the DCI transmission slot, but the C-DAI and/or T-DAI values are the latest slot among the PDSCH(s) scheduled by DCI. It can be calculated based on (or mini-slot). For example, the C-DAI may be calculated based on the DCI transmission slot, and the T-DAI may be calculated based on the latest slot (or mini-slot) among PDSCHs scheduled by DCI. In this case, referring to FIG. 20, C-DAI=0/T-DAI=1 may be signaled in slot #T, and C-DAI=2/T-DAI=3 may be signaled in slot #T+3. .

As shown in FIG. 21, the DAI value may be increased for each CC, and the base station expects that the 4-bit HARQ-ACK information is fed back because the PDSCH is scheduled on a total of 4 CCs (2 CC#1, 2 CC#2). I can. At this time, in the example of FIG. 21, both C-DAI and T-DAI values are calculated based on the DAI value in the scheduling DCI transmission CC, but the C-DAI and/or T-DAI values are the CC(s) scheduled in the DCI. Among them, the DAI value may be calculated based on a specific CC (eg, the largest CC index or the smallest CC index). As an example, when the C-DAI and T-DAI of the multi-CC DCI are calculated based on CC#2 in the scheduling DCI transmission slot, C-DAI=2, T-DAI in slot#T+2 May be signaled as =2.

Meanwhile, in the existing NR, each DAI field is limited to 2 bits in consideration of the DCI missing case, but if a plurality of PDSCHs can be scheduled in each DCI, the DCI missing case may have a greater effect on the DAI. In consideration of this, the DAI field size of the multi-TTI (or multi-CC) DCI may be larger than the existing (eg, 2 bits). For example, the DAI field size of the multi-TTI (or multi-CC) DCI may be determined as 2 + ceiling{log ₂ (the maximum value among N values for each CC (or BWP) set in the same cell group)}. Here, ceiling {X} means the smallest integer value among integers greater than or equal to X. In this way, the DAI field with an increased size is applied only to Opt1) multi-TTI (or multi-CC) DL allocation and single-TTI (or, single-CC) DL allocation (e.g., fallback DCI (e.g., DCI format) 1_0); does not apply to multi-TTI (or multi-CC) DL allocation when only one PDSCH is actually scheduled), or Opt2) multi-TTI (or multi-CC) DL allocation as well as single-TTI It can also be commonly applied to DL allocation (eg, fallback DCI (eg, DCI format 1_0); when only one PDSCH is actually scheduled by multi-TTI (or multi-CC) DL allocation). In the case of Opt1, a plurality of PDSCHs and a single-TTI (or, single-CC) DL allocation (e.g., fallback DCI) scheduled by multi-TTI (or multi-CC) DL allocation even in one CC (or slot) For example, DCI format 1_0); HARQ-ACK information for one PDSCH scheduled in multi-TTI (or multi-CC) DL allocation when only one PDSCH is actually scheduled is a separate (sub-) codebook. The base station can expect to be configured and fed back. In the case of Opt2, even in one CC (or slot), a plurality of PDSCHs scheduled with multi-TTI (or multi-CC) DL allocation and a single-TTI (or single-CC) DL allocation (e.g., fallback DCI ( For example, DCI format 1_0); The base station can expect that one PDSCH scheduled by multi-TTI (or multi-CC) DL allocation is actually scheduled with only one PDSCH as one codebook and fed back. .

Meanwhile, HARQ-ACK information corresponding to a plurality of PDSCHs scheduled by one multi-TTI DCI may be received through a plurality of UL channels instead of one UL channel (eg, PUCCH, PUSCH). As an example, similar to the LTE TDD system, when the HARQ-ACK reception timing for each PDSCH is previously defined or configured, a (partial) UL slot may be located between DL slots (or subframes), and the corresponding UL slot HARQ-ACK information corresponding to some PDSCH(s) among a plurality of PDSCHs scheduled by one multi-TTI DCI may be fed back. Considering that the DAI corresponding to different HARQ-ACK feedback opportunities must be calculated separately, there is no discrepancy in the size of the HARQ-ACK codebook, corresponding to some of the PDSCHs scheduled by one multi-TTI DCI If the HARQ-ACK information is fed back first, it is proposed that the DAI for the remaining PDSCH should be counted again from 0.

For example, as shown in FIG. 22, although the PDSCH of 3 slots (eg, slot #T/T+1/T+4) is scheduled in slot #T, HARQ- corresponding to the PDSCH of slot #T/T+1 ACK may be preferentially fed back in slot #T+3. In this case, the UE may recognize the C-DAI corresponding to the PDSCH of slot #T+4 as 0 instead of 2. Accordingly, the base station may signal a next C-DAI value of 1 in a multi-TTI DCI scheduling a subsequent DL allocation, that is, a PDSCH of slot #T+6. Alternatively, a case in which a (partial) UL slot may be located between DL slots (or subframes) and a plurality of PDSCHs scheduled by one multi-TTI DCI is not consecutive in time due to the corresponding UL slot does not occur. To this end, the maximum number of PDSCHs that can be scheduled by the multi-TTI DCI may be limited to the maximum number of DL slots that can be contiguous in a corresponding cell. For example, in the LTE TDD system, the maximum number of PDSCHs that the multi-TTI DCI can schedule may be limited by the number of consecutive DL subframes for each DL/UL configuration. In addition, in scheduling a plurality of TBs in a multi-TTI DCI, one TB is repeatedly transmitted (or transmitted by changing an additional redundancy version (RV)) in a plurality of slots (or subframes, mini-slots). Can be scheduled. In this case, it is assumed that PDSCHs on a plurality of slots (or subframes, mini-slots) corresponding to the same TB have one DAI value, and the same rules as in FIG. 22 may be applied. As an example, as shown in FIG. 23, when two TBs are scheduled in slot #T and each TB is transmitted while changing the RV value over two slots, the terminal sets 1 C-DAI corresponding to the PDSCH of slot #T+5. It can be recognized as 0. Accordingly, the base station may signal a next C-DAI value of 1 in a multi-TTI DCI scheduling a subsequent DL allocation, that is, a PDSCH of slot #T+6.

In addition, when there is no DCI and PDSCH on slot #T+6 and slot #T+7 in FIG. 22, the UE feedbacks HARQ-ACK information corresponding to the PDSCH of slot #T+4 in slot #T+9 can do. In this case, the resource used to feed back HARQ-ACK information in slot #T+9 may be signaled by the DCI of slot #T scheduling the PDSCH of slot #T+9. That is, in receiving HARQ-ACK information corresponding to a plurality of PDSCHs scheduled by the DCI of slot #T in slot #T+3 and slot #T+9, it is used to receive HARQ-ACK information in each slot. The resource may be signaled by the DCI of slot #T. For example, resource candidates for HARQ-ACK feedback are set through RRC signaling, and one of the resource candidates may be indicated through multi-TTI DCI. Here, the resource candidate may include a PUCCH resource candidate. In this case, the resource indicated through the multi-TTI DCI may be commonly applied to slot #T+3 and slot #T+9. Alternatively, in setting resource candidates for HARQ-ACK feedback through RRC signaling, resource candidate groups are set, and one of the resource candidate groups may be indicated through multi-TTI DCI. Here, the resource candidate group includes resource candidates of each slot. For example, one resource candidate group may be set to resource A in a first slot and resource B in a second slot.

When a plurality of PDSCHs are scheduled by multi-TTI DCI, a resource (eg, PUCCH resource) containing HARQ-ACK information for a plurality of PDSCHs is a slot index and/or a specific CCE index of the PDCCH (eg, the smallest CCE index ) Can be determined. For example, in the case of LTE PUCCH format 1b with channel selection (refer to Table 8), PUCCH resources are determined by a function of a subframe index through which the PDCCH is transmitted and the smallest CCE index of the corresponding PDCCH. However, when DCI scheduling the PDSCH of slot #T/T+1/T+2 is received in slot #T, as shown in FIG. 15, a method of determining a resource containing HARQ-ACK information received in slot #T+4 Suggest.

-Alt. 1: When a specific CCE index (eg, the first or smallest CCE index) in which the multi-TTI DCI is transmitted in slot #T is defined as CCE1, (slot #T and CCE1, slot #T and CCE1+alpha, slot A resource containing HARQ-ACK information received in slot #T+4 may be determined by a function of #T and CCE1+2*alpha}. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

■ For example, three PUCCH resource indexes on slot #T+4 linked to three CCE indexes {CCE1, CCE1+alpha, CCE1+2*alpha} of slot #T are, slot #T/T+1/T It can be used to determine PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK reception for the PDSCH of +2. For example, three PUCCH resource indexes on slot #T+4 can be obtained by replacing n _CCE,i in Equation 2 with {CCE1, CCE1+alpha, CCE1+2*alpha}. In addition, i in Equation 2 may be replaced with a value corresponding to slot #T+5. For example, a value corresponding to slot #T may be given as 0, a slot index, or (slot index mod X). X is a positive integer.

-Alt. 2: When defining a specific CCE index (eg, the first or smallest CCE index) in which the multi-TTI DCI is transmitted in slot #T as CCE1, (slot #T and CCE1, slot #T+1 and CCE1, slot A resource containing HARQ-ACK information received in slot #T+4 may be determined by a function of #T+2 and CCE1}.

■ For example, 3 PUCCH resource indexes on slot #T+4 linked to {CCE index CCE1 on slot #T, CCE index CCE1 on slot #T+1, CCE index CCE1 on slot #T+2} It may be used to determine PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK reception for PDSCH of #T/T+1/T+2. For example, the three PUCCH resource indexes on slot #T+4 can be obtained by replacing i in Equation 2 with a value corresponding to {slot #T, slot #T+1, slot #T+2}. . For example, a value corresponding to {slot #T, slot #T+1, slot #T+2} may be given as 0-2, a slot index, or (slot index mod X). X is a positive integer.

Based on PUCCH format 1b with channel selection, the base station receives A/N bits through a specific resource among a plurality of PUCCH format 1b resources, and A/N for a plurality of PDSCHs based on a combination of PUCCH resources and A/N bits. N state can be determined.

In addition, when DCI scheduling DL data (eg, PDSCH) of slot #T+5/T+6/T+7 is transmitted in slot #T as shown in FIG. 15, HARQ- received in slot #T+9- We propose a method for determining a resource containing ACK information.

-Alt. A: When a specific CCE index (e.g., the first or smallest CCE index) in which the multi-TTI DCI is received in slot #T is defined as CCE1, (slot #T+5 and CCE1, slot #T+5 and CCE1) A resource containing HARQ-ACK information received in slot #T+9 may be determined by a function of +alpha, slot #T+5, and CCE1+2*alpha}. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

■ For example, three PUCCH resource indexes on slot #T+9 linked to three CCE indexes {CCE1, CCE1+alpha, CCE1+2*alpha} of slot #T+5 are, slot #T+5/T It can be used to determine PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK reception for +6/T+7 DL data (eg, PDSCH). For example, three PUCCH resource indexes on slot #T+9 can be obtained by replacing n _CCE,i in Equation 2 with {CCE1, CCE1+alpha, CCE1+2*alpha}. In addition, i in Equation 2 may be replaced with a value corresponding to slot #T+5. For example, a value corresponding to slot #T+5 may be given as 0, a slot index, or (slot index mod X). X is a positive integer.

-Alt. B: When a specific CCE index (eg, the first or smallest CCE index) in which the multi-TTI DCI is transmitted in slot #T is defined as CCE1, (slot #T+5 and CCE1, slot #T+6 and CCE1) , A resource containing HARQ-ACK information received in slot #T+9 may be determined by a function of slot #T+7 and CCE1}.

■ As an example, three PUCCH resource indexes on slot #T+9 linked to {CCE index CCE1 of slot #T+5, CCE index CCE1 of slot #T+6, CCE index CCE1 of slot #T+7} , It can be used for determining PUCCH resources (eg, LTE PUCCH format 1b with channel selection) for HARQ-ACK reception for DL data (eg, PDSCH) of slot #T+5/T+6/T+7. For example, the three PUCCH resource indexes on slot #T+4 can be obtained by replacing i in Equation 2 with values corresponding to {slot #T+5, slot #T+6, slot #T+7}. I can. For example, a value corresponding to {slot #T+5, slot #T+6, slot #T+7} may be given as 0-2, a slot index, or (slot index mod X). X is a positive integer.

In addition, in scheduling a plurality of TBs in a multi-TTI DCI, one TB is repeatedly transmitted (or transmitted by changing an additional redundancy version (RV)) in a plurality of slots (or subframes, mini-slots). Can be scheduled. As an example, as shown in FIG. 25, while scheduling 4 TBs in slot #T, it may be instructed to transmit each TB while changing the RV value over 2 slots, and in this case, the same rule as in FIG. 15 may be applied. Specifically, a method of determining a resource containing HARQ-ACK information received in slot #T+5 is proposed.

-Alt. 1': When a specific CCE index (eg, the first or smallest CCE index) in which the multi-TTI DCI is transmitted in slot #T is defined as CCE1, {slot #T and CCE1, slot #T and CCE1+alpha} A resource containing HARQ-ACK information received in slot #T+5 may be determined by a function of. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

-Alt. 2': When defining a specific CCE index (eg, the first or smallest CCE index) to which a multi-TTI DCI is transmitted in slot #T as CCE1, {(slot #T or slot #T+1) and CCE1; A resource containing HARQ-ACK information received in slot #T+5 may be determined by a function of (slot #T+2 or slot #T+3) and CCE1}.

In addition, HARQ-ACK information received in slot #T+11 when DCI scheduling the PDSCH of slot #T+6/T+7/T+8/T+9 is transmitted in slot #T as shown in FIG. 25 Suggests a method for determining the resources to contain.

-Alt. A': When defining a specific CCE index (eg, the first or smallest CCE index) in which the multi-TTI DCI is transmitted in slot #T as CCE1, (slot #T+6 and CCE1, slot #T+6 and A resource containing HARQ-ACK information received in slot #T+11 may be determined by a function of CCE1+alpha}. alpha may be set in advance or indicated/set by L1 signaling (eg, PDCCH)/higher layer (eg, RRC) signaling. For example, alpha may be 1.

-Alt. B': When defining a specific CCE index (eg, the first or smallest CCE index) to which the multi-TTI DCI is transmitted in slot #T as CCE1, ((slot #T+6 or slot #T+7) and CCE1; A resource containing HARQ-ACK information received in slot #T+11 may be determined by a function of (slot #T+8 or slot #T+9) and CCE1}.

3) Receiver & Transmitter (Between Receiver and Transmitter)

26 illustrates a HARQ-ACK process according to an example of the present invention. Referring to FIG. 26, the base station may transmit configuration information related to the HARQ-ACK codebook to the terminal (S2102). For example, the configuration information may include configuration information related to the Type 2 HARQ-ACK codebook. In addition, the base station may transmit information related to the maximum number (N) of PDSCHs that can be scheduled by a single DCI (eg, multi-TTI DCI) to the terminal (S2104). Here, the N value may be set for each CC/BWP. Steps S2102 and S2104 may be performed through higher layer signaling (eg, RRC signaling). In addition, steps S2102 and S2104 may be provided to the terminal simultaneously or separately in the time domain. Thereafter, the base station may transmit the multi-TTI DCI through the PDCCH (S2106). The multi-TTI DCI includes scheduling information for a maximum of N PDSCHs. In addition, the multi-TTI DCI may include information on HARQ-ACK timing. In addition, the multi-TTI DCI includes C-DAI, and may further include T-DAI (based on the number of merged cells). Thereafter, the base station may transmit the PDSCH(s) corresponding to the multi-TTI DCI to the terminal (S2106). Here, the PDSCH(s) may be transmitted in a plurality of different cells (or CCs) in the same slot, respectively, or may be transmitted in a plurality of different slots in the same cell (or CC). Thereafter, the UE may construct a HARQ-ACK codebook according to [Method #1] and/or [Method #2] of the present specification to feed back HARQ-ACK information to the base station. For example, in the case of [Method #1], a HARQ-ACK codebook including N HARQ-ACK information may be fed back in response to the PDSCH(s) based on the information (eg, N) of step S2104. have. The HARQ-ACK codebook may be transmitted from the terminal to the base station through PUCCH or PUSCH.

27 illustrates a HARQ-ACK process according to an example of the present invention.

Referring to FIG. 27, the UE may receive a PDCCH including scheduling information on a plurality of PDSCHs (S2202). Thereafter, the UE may determine a HARQ-ACK response set for a plurality of PDSCHs based on the plurality of PDSCHs received in a plurality of time units (S2204). Thereafter, the UE may select one PUCCH resource from a plurality of PUCCH resources based on the HARQ-ACK response set (S2206), and transmit a bit value corresponding to the HARQ-ACK response set using the selected PUCCH resource ( S1708).

Here, a plurality of PUCCH resources may be determined based on a combination of an index of a specific CCE used for reception of the PDCCH and a plurality of offsets. Preferably, the plurality of offsets may include a plurality of different integers. More specifically, a plurality of PUCCH resources are determined based on a value that satisfies {index of a specific CCE + n*offset}, n is an integer of 0 to (number of multiple PUCCH resources-1), and the offset is May not be zero. Also, a plurality of offsets may be determined based on indices of the plurality of time units. More specifically, a plurality of PUCCH resources may be determined based on a function value of {the index of the specific CCE, the index of each time unit}.

The above-described signal transmission and reception operations can be applied equally to a licensed band or an unlicensed band. In this case, a communication device (eg, a base station, a terminal) that transmits a specific signal on an unlicensed band may use/perform a Channel Access Procedure (CAP) to transmit a specific signal. More specifically, when a plurality of PDSCHs are transmitted/received through an unlicensed band, the base station may transmit the plurality of PDSCHs to the terminal based on the CAP for transmitting the plurality of PDSCHs. Alternatively, when a PUCCH including HARQ-ACK information for a plurality of PDSCHs is transmitted and received through an unlicensed band, the UE may transmit the PUCCH to the base station based on the CAP for PUCCH transmission.

The terminal may perform a network access procedure to perform the procedures and/or methods described/suggested above. For example, while accessing a network (e.g., a base station), the terminal provides system information and configuration information (e.g., A/N information configuration/feedback method, slot) required to perform the procedures and/or methods described/proposed above. Configuration information, PUCCH resource set for A/N transmission, etc.) may be received and stored in a memory. Configuration information required for the present invention may be received through higher layer (eg, RRC layer; Medium Access Control, MAC, layer, etc.) signaling.

28 illustrates an initial network connection and a subsequent communication process. In NR, a physical channel and a reference signal may be transmitted using beam-forming. When beam-forming-based signal transmission is supported, a beam-management process may be involved in order to align beams between the base station and the terminal. In addition, the signal proposed in the present invention can be transmitted/received using beam-forming. In the Radio Resource Control (RRC) IDLE mode, beam alignment may be performed based on SSB. On the other hand, in the RRC CONNECTED mode, beam alignment may be performed based on CSI-RS (in DL) and SRS (in UL). Meanwhile, when beam-forming-based signal transmission is not supported, an operation related to a beam may be omitted in the following description.

Referring to FIG. 28, a base station (eg, BS) may periodically transmit an SSB (S702). Here, SSB includes PSS/SSS/PBCH. SSB can be transmitted using beam sweeping. Thereafter, the base station may transmit Remaining Minimum System Information (RMSI) and Other System Information (OSI) (S704). The RMSI may include information (eg, PRACH configuration information) necessary for the terminal to initially access the base station. Meanwhile, after performing SSB detection, the UE identifies the best SSB. Thereafter, the terminal may transmit a RACH preamble (Message 1, Msg1) to the base station using the PRACH resource linked/corresponding to the index (ie, the beam) of the best SSB (S706). The beam direction of the RACH preamble is associated with the PRACH resource. The association between the PRACH resource (and/or the RACH preamble) and the SSB (index) may be set through system information (eg, RMSI). Thereafter, as part of the RACH process, the base station transmits a RAR (Random Access Response) (Msg2) in response to the RACH preamble (S708), and the UE uses the UL grant in the RAR to make Msg3 (e.g., RRC Connection Request). After transmitting (S710), the base station may transmit a contention resolution message (Msg4) (S720). Msg4 may include RRC Connection Setup.

When an RRC connection is established between the base station and the terminal through the RACH process, subsequent beam alignment may be performed based on SSB/CSI-RS (in DL) and SRS (in UL). For example, the terminal may receive an SSB/CSI-RS (S714). SSB/CSI-RS may be used by the UE to generate a beam/CSI report. Meanwhile, the base station may request a beam/CSI report from the terminal through DCI (S716). In this case, the UE may generate a beam/CSI report based on the SSB/CSI-RS, and transmit the generated beam/CSI report to the base station through PUSCH/PUCCH (S718). The beam/CSI report may include a beam measurement result, information on a preferred beam, and the like. The base station and the terminal may switch the beam based on the beam/CSI report (S720a, S720b).

Thereafter, the terminal and the base station may perform the procedures and/or methods described/suggested above. For example, the terminal and the base station process the information in the memory according to the present invention based on the configuration information obtained in the network access process (e.g., system information acquisition process, RRC connection process through RACH, etc.) Or may process the received radio signal and store it in a memory. Here, the radio signal may include at least one of a PDCCH, a PDSCH, and a reference signal (RS) in case of a downlink, and may include at least one of a PUCCH, a PUSCH, and an SRS in case of an uplink. For example, the UE receives downlink scheduling information (eg, DCI) from the base station through the PDCCH according to the proposal of the present specification, receives the PDSCH based on the downlink scheduling information, and then HARQ-ACK for the PDSCH. Information can be transmitted through PUCCH or PUSCH.

The UE may perform the DRX operation while performing the procedures and/or methods described/suggested above. A terminal in which DRX is configured can reduce power consumption by discontinuously receiving DL signals. DRX may be performed in Radio Resource Control (RRC)_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state. In the RRC_IDLE state and RRC_INACTIVE state, the DRX is used to receive paging signals discontinuously. Hereinafter, DRX performed in the RRC_CONNECTED state will be described (RRC_CONNECTED DRX).

29 illustrates the DRX cycle (RRC_CONNECTED state).

Referring to FIG. 29, the DRX cycle consists of On Duration and Opportunity for DRX. The DRX cycle defines a time interval in which On Duration is periodically repeated. On Duration represents a time period during which the UE monitors to receive the PDCCH. When DRX is configured, the UE performs PDCCH monitoring during On Duration. If there is a PDCCH successfully detected during PDCCH monitoring, the UE operates an inactivity timer and maintains an awake state. On the other hand, if there is no PDCCH successfully detected during PDCCH monitoring, the terminal enters a sleep state after the On Duration is over. Accordingly, when DRX is configured, PDCCH monitoring/reception may be discontinuously performed in the time domain in performing the procedure and/or method described/proposed above. For example, when DRX is set, in the present invention, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be set discontinuously according to the DRX configuration. On the other hand, when DRX is not set, PDCCH monitoring/reception may be continuously performed in the time domain in performing the procedures and/or methods described/proposed above. For example, when DRX is not set, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously set in the present invention. Meanwhile, regardless of whether or not DRX is set, PDCCH monitoring may be restricted in a time period set as a measurement gap.

Although not limited thereto, various descriptions, functions, procedures, proposals, methods, and/or operational flow charts of the present invention disclosed in this document may be applied to various fields requiring wireless communication/connection (eg, 5G) between devices. have.

Hereinafter, it will be illustrated in more detail with reference to the drawings. In the following drawings/description, the same reference numerals may exemplify the same or corresponding hardware block, software block, or functional block, unless otherwise indicated.

30 illustrates a communication system 1 applied to the present invention.

Referring to FIG. 30, a communication system 1 applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device. Although not limited thereto, wireless devices include robots 100a, vehicles 100b-1 and 100b-2, eXtended Reality (XR) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, including HMD (Head-Mounted Device), HUD (Head-Up Display), TV, smartphone, It can be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, and the like. Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebook computers, etc.). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station/network node to another wireless device.

The wireless devices 100a to 100f may be connected to the network 300 through the base station 200. AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 through the network 300. The network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 100a to 100f may communicate with each other through the base station 200 / network 300, but may perform direct communication (e.g. sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (eg, Vehicle to Vehicle (V2V)/Vehicle to Everything (V2X) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

Wireless communication/connections 150a, 150b, and 150c may be established between the wireless devices 100a to 100f / base station 200 and the base station 200 / base station 200. Here, the wireless communication/connection includes various wireless access such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, Integrated Access Backhaul). This can be achieved through technology (eg 5G NR) Through wireless communication/connections 150a, 150b, 150c, the wireless device and the base station/wireless device, and the base station and the base station can transmit/receive radio signals to each other. For example, the wireless communication/connection 150a, 150b, 150c can transmit/receive signals through various physical channels. To this end, based on various proposals of the present invention, for transmission/reception of wireless signals At least some of a process of setting various configuration information, various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation process, and the like may be performed.

31 illustrates a wireless device applicable to the present invention.

Referring to FIG. 31, the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR). Here, {the first wireless device 100, the second wireless device 200} is the {wireless device 100x, the base station 200} and/or {wireless device 100x, wireless device 100x) of FIG. 30 } Can be matched.

The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and/or one or more antennas 108. The processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information/signal, and then transmit a radio signal including the first information/signal through the transceiver 106. In addition, the processor 102 may store information obtained from signal processing of the second information/signal in the memory 104 after receiving a radio signal including the second information/signal through the transceiver 106. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may perform some or all of the processes controlled by the processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow charts disclosed in this document. It can store software code including Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 106 may be coupled with the processor 102 and may transmit and/or receive radio signals through one or more antennas 108. The transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be mixed with an RF (Radio Frequency) unit. In the present invention, the wireless device may mean a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208. The processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206. In addition, the processor 202 may store information obtained from signal processing of the fourth information/signal in the memory 204 after receiving a radio signal including the fourth information/signal through the transceiver 206. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may perform some or all of the processes controlled by the processor 202, or instructions for performing the descriptions, functions, procedures, suggestions, methods and/or operational flow charts disclosed in this document. It can store software code including Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 206 may be connected to the processor 202 and may transmit and/or receive radio signals through one or more antennas 208. The transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present invention, the wireless device may mean a communication modem/circuit/chip.

Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102, 202 may be configured to generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, functions, procedures, proposals, methods, and/or operational flow charts disclosed in this document. Can be generated. One or more processors 102, 202 may generate messages, control information, data, or information according to the description, function, procedure, suggestion, method, and/or operational flow chart disclosed herein. At least one processor (102, 202) generates a signal (e.g., a baseband signal) including PDU, SDU, message, control information, data or information according to the functions, procedures, proposals and/or methods disclosed herein. , It may be provided to one or more transceivers (106, 206). One or more processors 102, 202 may receive signals (e.g., baseband signals) from one or more transceivers 106, 206, and the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein PDUs, SDUs, messages, control information, data, or information may be obtained according to the parameters.

One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) May be included in one or more processors 102 and 202. The description, functions, procedures, suggestions, methods, and/or operational flow charts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. The description, functions, procedures, proposals, methods and/or operational flow charts disclosed in this document are included in one or more processors 102, 202, or stored in one or more memories 104, 204, and are It may be driven by the above processors 102 and 202. The descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and/or a set of instructions.

One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions and/or instructions. One or more memories 104 and 204 may be composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium, and/or combinations thereof. One or more memories 104 and 204 may be located inside and/or outside of one or more processors 102 and 202. In addition, one or more memories 104, 204 may be connected to one or more processors 102, 202 through various technologies such as wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, control information, radio signals/channels, and the like mentioned in the methods and/or operation flow charts of this document to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, radio signals/channels, etc. mentioned in the description, functions, procedures, suggestions, methods and/or operation flow charts disclosed in this document from one or more other devices. have. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202, and may transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or radio signals to one or more other devices. In addition, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or radio signals from one or more other devices. In addition, one or more transceivers (106, 206) may be connected with one or more antennas (108, 208), and one or more transceivers (106, 206) through one or more antennas (108, 208), the description and functionality disclosed in this document. It may be set to transmit and receive user data, control information, radio signals/channels, and the like mentioned in a procedure, a proposal, a method and/or an operation flowchart. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). One or more transceivers (106, 206) in order to process the received user data, control information, radio signal / channel, etc. using one or more processors (102, 202), the received radio signal / channel, etc. in the RF band signal. It can be converted into a baseband signal. One or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 and 202 from a baseband signal to an RF band signal. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.

In this specification, at least one memory (eg, 104 or 204) may store instructions or programs, and the instructions or programs are at least operably connected to the at least one memory when executed. It may cause one processor to perform operations according to some embodiments or implementations of the present specification.

In the present specification, a computer-readable storage medium may store at least one instruction or a computer program, and the at least one instruction or computer program is executed by at least one processor. It may cause one processor to perform operations according to some embodiments or implementations of the present specification.

In the present specification, a processing device or apparatus may include at least one processor and at least one computer memory that is connectable to the at least one processor. The at least one computer memory may store instructions or programs, and the instructions or programs, when executed, cause at least one processor to be operably connected to the at least one memory. It may be possible to perform operations according to embodiments or implementations.

32 shows another example of a wireless device applied to the present invention. The wireless device may be implemented in various forms according to use-examples/services (see FIG. 30).

Referring to FIG. 32, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 31, and various elements, components, units/units, and/or modules ) Can be composed of. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver(s) 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of FIG. 31. For example, the transceiver(s) 114 may include one or more transceivers 106,206 and/or one or more antennas 108,208 of FIG. 31. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls all operations of the wireless device. For example, the controller 120 may control the electrical/mechanical operation of the wireless device based on the program/code/command/information stored in the memory unit 130. In addition, the control unit 120 transmits the information stored in the memory unit 130 to an external (eg, other communication device) through the communication unit 110 through a wireless/wired interface, or through the communication unit 110 to the outside (eg, Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130.

The additional element 140 may be variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an I/O unit, a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (FIGS. 30, 100a), vehicles (FIGS. 30, 100b-1, 100b-2), XR devices (FIGS. 30, 100c), portable devices (FIGS. 30, 100d), and home appliances. (FIGS. 30, 100e), IoT devices (FIGS. 30, 100f), digital broadcasting terminals, hologram devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate/environment devices, It may be implemented in the form of an AI server/device (FIGS. 30 and 400), a base station (FIGS. 30 and 200), and a network node. The wireless device can be used in a mobile or fixed location depending on the use-example/service.

In FIG. 32, various elements, components, units/units, and/or modules in the wireless devices 100 and 200 may be entirely interconnected through a wired interface, or at least some may be wirelessly connected through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130, 140) are connected through the communication unit 110. Can be connected wirelessly. In addition, each element, component, unit/unit, and/or module in the wireless device 100 and 200 may further include one or more elements. For example, the controller 120 may be configured with one or more processor sets. For example, the control unit 120 may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, and a memory control processor. As another example, the memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.

33 illustrates a vehicle or an autonomous driving vehicle applied to the present invention. The vehicle or autonomous vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), or a ship.

Referring to FIG. 33, the vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and autonomous driving. It may include a unit (140d). The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110/130/140a to 140d correspond to blocks 110/130/140 of FIG. 32, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, base stations (e.g. base stations, roadside base stations, etc.), and servers. The controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel on the ground. The driving unit 140a may include an engine, a motor, a power train, a wheel, a brake, a steering device, and the like. The power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100, and may include a wired/wireless charging circuit, a battery, and the like. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like. The sensor unit 140c is an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, and a vehicle advancement. /Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, etc. may be included. The autonomous driving unit 140d is a technology for maintaining a driving lane, a technology for automatically adjusting the speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and for driving by automatically setting a route when a destination is set. Technology, etc. can be implemented.

For example, the communication unit 110 may receive map data and traffic information data from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The controller 120 may control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving path according to the driving plan (eg, speed/direction adjustment). During autonomous driving, the communication unit 110 asynchronously/periodically acquires the latest traffic information data from an external server, and may acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit 140c may acquire vehicle state and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data/information. The communication unit 110 may transmit information about a vehicle location, an autonomous driving route, and a driving plan to an external server. The external server may predict traffic information data in advance using AI technology or the like based on information collected from the vehicle or autonomously driving vehicles, and may provide the predicted traffic information data to the vehicle or autonomously driving vehicles.

The embodiments described above are those in which components and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, it is also possible to constitute an embodiment of the present invention by combining some components and/or features. The order of operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that the embodiments may be configured by combining claims that do not have an explicit citation relationship in the claims or may be included as new claims by amendment after filing.

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

The present invention can be used in a terminal, a base station, or other equipment of a wireless mobile communication system.

Claims (15)

In a method for transmitting a wireless signal by a terminal in a wireless communication system, Receiving a physical downlink control channel (PDCCH) including scheduling information about a plurality of physical downlink shared channels (PDSCHs); Determining a hybrid automatic repeat request acknowledgment (HARQ-ACK) response set for the plurality of PDSCHs based on the plurality of PDSCHs received in a plurality of time units; Selecting one PUCCH resource from a plurality of physical uplink control channel (PUCCH) resources based on the HARQ-ACK response set; And Transmitting a bit value corresponding to the HARQ-ACK response set using the selected PUCCH resource, The plurality of PUCCH resources are determined based on a combination of an index of a specific control channel element (CCE) used for reception of the PDCCH and a plurality of offsets. The method of claim 1, The plurality of offsets includes a plurality of different integers. The method of claim 2, The plurality of PUCCH resources are determined based on a value that satisfies {the index of the specific CCE + n*offset}, n is an integer from 0 to (the number of the plurality of PUCCH resources-1), and the offset is 0 Is not an integer method. The method of claim 1, The plurality of offsets are determined based on indices of the plurality of time units. The method of claim 4, The plurality of PUCCH resources are determined based on a function value of {the index of the specific CCE, the index of each time unit}. In a terminal used in a wireless communication system, At least one processor; And And at least one computer memory operatively connected to the at least one processor and configured to allow the at least one processor to perform an operation when executed, the operation comprising: Receiving a PDCCH (physical downlink control channel) including scheduling information on a plurality of PDSCH (physical downlink shared channel), Based on the plurality of PDSCHs received in a plurality of time units, a hybrid automatic repeat request acknowledgment (HARQ-ACK) response set for the plurality of PDSCHs is determined, Based on the HARQ-ACK response set, select one PUCCH resource from a plurality of physical uplink control channel (PUCCH) resources, and Transmitting a bit value corresponding to the HARQ-ACK response set using the selected PUCCH resource, The plurality of PUCCH resources are determined based on a combination of an index of a specific control channel element (CCE) used for reception of the PDCCH and a plurality of offsets. The method of claim 6, The plurality of offsets are terminal including a plurality of different integers. The method of claim 7, The plurality of PUCCH resources are determined based on a value that satisfies {the index of the specific CCE + n*offset}, n is an integer from 0 to (the number of the plurality of PUCCH resources-1), and the offset is 0 A terminal that is not an integer. The method of claim 6, The plurality of offsets are determined based on the indexes of the plurality of time units. The method of claim 9, The plurality of PUCCH resources are determined based on a function value of {the index of the specific CCE, the index of each time unit}. In the device for a communication device, At least one processor; And And at least one computer memory operatively connected to the at least one processor and allowing the at least one processor to perform an operation when executed, the operation comprising: Receiving a PDCCH (physical downlink control channel) including scheduling information on a plurality of PDSCH (physical downlink shared channel), Based on the plurality of PDSCHs received in a plurality of time units, a hybrid automatic repeat request acknowledgment (HARQ-ACK) response set for the plurality of PDSCHs is determined, Based on the HARQ-ACK response set, select one PUCCH resource from a plurality of physical uplink control channel (PUCCH) resources, and Transmitting a bit value corresponding to the HARQ-ACK response set using the selected PUCCH resource, The plurality of PUCCH resources are determined based on a combination of an index of a specific control channel element (CCE) used for reception of the PDCCH and a plurality of offsets. The method of claim 11, The plurality of offsets includes a plurality of different integers. The method of claim 12, The plurality of PUCCH resources are determined based on a value that satisfies {the index of the specific CCE + n*offset}, n is an integer from 0 to (the number of the plurality of PUCCH resources-1), and the offset is 0 A device that is not an integer. The method of claim 11, The plurality of offsets are determined based on indices of the plurality of time units. The method of claim 11, The plurality of PUCCH resources are determined based on a function value of {the index of the specific CCE, the index of each time unit}.

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