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

Abstract

In a method and apparatus for transmitting and receiving a signal in a wireless communication system according to an embodiment of the present invention, a PUCCH including UCI is transmitted, and the resource for PUCCH transmission is determined by the first interlace of the first interlace and the second interlace based on (i) information about the PUCCH resource setting a first interlace and a second interlace having a higher index than the first interlace, and (ii) the number of PRBs (Physical Resource Blocks) for transmitting UCI is equal to or less than the number of PRBs of the first interlace.

Description

[Technical field]

[0001] The present invention relates to a method and apparatus for use in a wireless communication system. [Background technology]

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. In general, wireless communication systems are multiple access systems capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, etc. Detailed Description of the Invention

[0003] [Technical issues] A technical problem to be solved by the present invention is to provide a signal transmission / reception method and an apparatus therefor for efficiently transmitting an uplink channel in a wireless communication system.

[0004] The technical problem of the present invention is not limited to the above-mentioned technical problem, and other technical problems can be inferred from the embodiments of the present invention.

[0005] The present invention provides a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0006] In one aspect of the present invention, a signal transmission / reception method is provided for a terminal in a wireless communication system, the method comprising: receiving information regarding a PUCCH (Physical Uplink Control Channel) resource; and transmitting a PUCCH including Uplink Control Information (UCI) based on the information regarding the PUCCH resource, wherein (i) a first interlace and a second interlace having a higher index than the first interlace are set based on the information regarding the PUCCH resource; and (ii) the PUCCH is transmitted via a first interlace among the first interlace and the second interlace based on the number of PRBs (Physical Resource Blocks) for transmitting the UCI being less than or equal to the number of PRBs of the first interlace.

[0007] In another aspect of the present invention, a communications device (terminal) for transmitting and receiving signals in a wireless communication system is provided, the communications device including at least one transceiver, at least one processor, and at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform specific operations, the specific operations including receiving information regarding a PUCCH (Physical Uplink Control Channel) resource and transmitting a PUCCH including Uplink Control Information (UCI) based on the information regarding the PUCCH resource, wherein (i) a first interlace and a second interlace having a higher index than the first interlace are set based on the information regarding the PUCCH resource, and (ii) the PUCCH is transmitted via a first interlace among the first interlace and the second interlace based on the number of PRBs (Physical Resource Blocks) for transmitting UCI being less than or equal to the number of PRBs of the first interlace.

[0008] In another aspect of the present invention, an apparatus for a terminal is provided, the apparatus including at least one processor and at least one computer memory operably coupled to the at least one processor and configured to cause the at least one processor to perform operations when executed, the operations including receiving information regarding a PUCCH (Physical Uplink Control Channel) resource and transmitting a PUCCH including Uplink Control Information (UCI) based on the information regarding the PUCCH resource, wherein (i) a first interlace and a second interlace having a higher index than the first interlace are set based on the information regarding the PUCCH resource, and (ii) the PUCCH is transmitted via a first interlace among the first interlace and the second interlace based on the number of PRBs (Physical Resource Blocks) for transmitting UCI being less than or equal to the number of PRBs of the first interlace.

[0009] In another aspect of the present invention, a computer-readable storage medium is provided that includes at least one computer program that, when executed, causes at least one processor to perform operations including receiving information regarding a PUCCH (Physical Uplink Control Channel) resource and transmitting a PUCCH including Uplink Control Information (UCI) based on the information regarding the PUCCH resource, wherein the PUCCH is transmitted via a first interlace among the first interlace and the second interlace based on (i) a first interlace and a second interlace having a higher index than the first interlace are set according to the information regarding the PUCCH resource, and (ii) the number of PRBs (Physical Resource Blocks) for transmitting the UCI is less than or equal to the number of PRBs of the first interlace.

[0010] In these methods and apparatus, the number of PRBs for transmitting UCI being equal to or less than the number of PRBs of the first interlace is determined based on the size and coding rate of the UCI.

[0011] In these methods and apparatuses, the index of the first interlace and the index of the second interlace are set based on Radio Resource Control (RRC) signaling that includes information about PUCCH resources.

[0012] In these methods and apparatus, the first interlace and the second interlace include the same number of PRBs.

[0013] In these methods and apparatuses, the PUCCH is transmitted based on a specific PUCCH format, which includes PUCCH format 2 and PUCCH format 3.

[0014] The communication device includes at least a terminal, a network, and an autonomous vehicle capable of communicating with other autonomous vehicles other than the communication device.

[0015] The above-described aspects of the present invention are merely some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be understood and derived by those having ordinary skill in the art based on the detailed description of the present invention described below. [Effects of the invention]

[0016] According to an embodiment of the present invention, when an uplink channel is transmitted by a communication device, it is possible to perform more efficient transmission of the uplink channel through a differentiated operation from that of the conventional invention.

[0017] The technical effects of the present invention are not limited to the above-mentioned technical effects, and other technical effects may be inferred from the embodiments of the present invention. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 illustrates an example of a radio frame structure. [Diagram 2] FIG. 2 illustrates a resource grid of slots. [Diagram 3] A diagram showing an example of mapping physical channels within a slot. [Figure 4] FIG. 1 is a diagram illustrating an ACK / NACK transmission process. [Diagram 5] FIG. 1 illustrates a wireless communication system that supports unlicensed bands. [Figure 6] FIG. 1 illustrates a method for occupying resources in an unlicensed spectrum. [Figure 7-8] 1 is a flowchart of a Channel Access Procedure (CAP) for transmitting signals in an unlicensed band. [Figure 9] FIG. 1 is a diagram illustrating RB interlacing. [Figure 10] FIG. 2 is a diagram for explaining uplink channel transmission according to an embodiment of the present invention. [Figure 11-14] FIG. 1 illustrates an apparatus according to an embodiment of the present invention. MODE FOR CARRYING OUT THEINVENTION

[0019] The following technologies can be used for various wireless access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0020] For a clearer explanation, the present invention will be described based on a 3GPP communication system (e.g., LTE-A, NR), but the technical idea of ​​the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. In particular, LTE technology after 3GPP TS 36.xxx Release 10 is called LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is called LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR can also be called a 3GPP system. "xxx" refers to the detailed number of the standard document. LTE / NR is collectively called a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, please refer to the matters described in the standard documents published before the present invention. For example, the following documents can be referred to.

[0021] 3GPP NR

[0022] -38.211:Physical channels and modulation

[0023] -38.212:Multiplexing and channel coding

[0024] -38.213:Physical layer procedures for control

[0025] -38.214:Physical layer procedures for data

[0026] -38.300:NR and NG-RAN Overall Description

[0027] -38.331:Radio Resource Control(RRC) protocol specification

[0028] FIG. 1 illustrates the structure of a radio frame used in NR.

[0029] In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (Half-Frame, HF). A half-frame is defined as five 1 ms subframes (Subframe, SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the Subcarrier Spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). If a general CP is used, each slot contains 14 symbols. If an extended CP is used, each slot contains 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

[0030] Table 1 illustrates that when a general CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS.

[0031] [Table 1]

[0032] Table 2 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary with the SCS when an extended CP is used.

[0033] [Table 2]

[0034] In the NR system, OFDM(A) neurology (e.g., SCS, CP length, etc.) is set to be different among multiple cells merged to one terminal (User Equipment; UE), so that the (absolute time) duration of time resources (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) consisting of the same number of symbols is different among the merged cells.

[0035] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) neurologies (e.g., subcarrier spacing, SCS) to support various 5G services. For example, a 15kHz SCS supports wide areas in traditional cellular bands, while a 30kHz / 60kHz SCS supports dense urban areas, lower latency, and wider carrier bandwidth.

[0036] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 are configured as shown in Table 3 below. FR2 also stands for millimeter wave (mmW).

[0037] [Table 3]

[0038] Figure 2 illustrates the slot structure of an NR frame.

[0039] A slot includes multiple symbols in the time domain. For example, in the case of a general CP, one slot includes 14 symbols, while in the case of an extended CP, one slot includes 12 symbols. A carrier includes multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. In the frequency domain, multiple RB interlaces (or simply, interlaces) are defined. An interlace m ∈ {0, 1, ..., M-1} is composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}. M indicates the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive PRBs (Physical RBs) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier includes up to N BWPs (e.g., 5). Data communication is performed by an activated BWP, and only one BWP is activated for one terminal. Each element in the resource grid is called a resource element (RE), and one complex symbol can be mapped to it.

[0040] In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and the terminal transmits information to the base station via an uplink (UL). Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels / signals exist depending on the type / use of the information transmitted and received. A physical channel corresponds to a set of resource elements (RE) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (RE) used by a physical layer (PHY), but does not carry information derived from a higher layer. The higher layers include a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, etc.

[0041] DL physical channels include PBCH (Physical Broadcast channel), PDSCH (Physical Downlink Shared channel) and PDCCH (Physical Downlink Control channel). DL physical signals include DL RS (Reference Signal), PSS (Primary synchronization signal) and SSS (Secondary synchronization signal). DL RS include DM-RS (Demodulation RS), PT-RS (Phase-tracking RS) and CSI-RS (channel-state information RS). UL physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel). UL physical signals include UL RS. UL RS include DM-RS, PT-RS and SRS (Sounding RS).

[0042] FIG. 3 shows an example of mapping physical channels within a slot.

[0043] A DL control channel, DL or UL data, and UL control channel are all included in one slot. For example, the first N symbols in a slot are used to transmit the DL control channel (hereinafter, DL control region), and the last M symbols in a slot are used to transmit the UL control channel (hereinafter, UL control region). N and M are integers equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter, data region) is used to transmit DL data or UL data. There is a time gap between the control region and the data region for DL-to-UL or UL-to-DL switching. The PDCCH is transmitted in the DL control region, and the PDSCH is transmitted in the DL data region. Some symbols at the time of switching from DL to UL in a slot are used as the time gap.

[0044] In the present invention, the base station is, for example, a gNodeB.

[0045] Downlink (DL) physical channels / signals

[0046] (1) PDSCH

[0047] The PDSCH carries downlink data (e.g., DL-shared channel transport block, DL-SCH TB). The TB is encoded into a codeword (CW) and then transmitted through a process of scrambling and modulation. The CW includes one or more code blocks (CB). One or more CBs are collected into one CBG (CB group). Depending on the cell configuration, the PDSCH can carry up to two CWs. Scrambling and modulation are performed for each CW, and the modulation symbols generated from each CW are mapped to one or more layers. Each layer is precoded, mapped to resources together with the DMRS, and transmitted from the corresponding antenna port. The PDSCH is dynamically scheduled by the PDCCH (dynamic scheduling) or semi-statically scheduled (Configured Scheduling, CS) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). Thus, in dynamic scheduling, PDSCH transmission is accompanied by a PDCCH, whereas in CS, PDSCH transmission is not accompanied by a PDCCH. CS includes semi-persistent scheduling (SPS).

[0048] (2) PDCCH

[0049] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of DL-SCH, frequency / time resource allocation information for UL-SCH (shared channel), paging information for PCH (paging channel), system information on DL-SCH, frequency / time resource allocation information for higher layer control messages such as voluntary access response (RAR) transmitted on PDSCH, transmission power control command, and information on activation / deactivation of SPS / CS (Configured Scheduling), etc. Various DCI formats are provided depending on the information in the DCI.

[0050] Table 4 illustrates an example of a DCI format transmitted via the PDCCH.

[0051] [Table 4]

[0052] DCI format 0_0 is used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​is used to schedule TB-based (or TB-level) PUSCH or CBG (Code Block Group)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 is used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 is referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 is referred to as DL grant DCI or UL scheduling information. DCI format 2_0 is used to deliver dynamic slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to deliver downlink pre-Emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 are transmitted to terminals in a corresponding group via a group common PDCCH, which is a PDCCH transmitted to terminals defined as one group.

[0053] The PDCCH / DCI includes a cyclic redundancy check (CRC), and the CRC is masked / scrambled to various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or use of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked to Cell-RNTI (C-RNTI). If the PDCCH is related to paging, the CRC is masked to P-RNTI (Paging-RNTI). If the PDCCH is related to system information (e.g., System Information Block, SIB), the CRC is masked to System Information RNTI (SI-RNTI). If the PDCCH is related to an unsolicited access response, the CRC is masked to Random Access-RNTI (RA-RNTI).

[0054] Table 5 shows an example of the use of PDCCH according to RNTI and the transmission channel. The transmission channel indicates the transmission channel related to the data carried by the PDSCH / PUSCH scheduled by the PDCCH.

[0055] [Table 5]

[0056] The modulation method of the PDCCH is fixed (e.g., Quadrature Phase Shift Keying, QPSK), and one PDCCH is composed of 1, 2, 4, 8, or 16 CCEs (Control Channel Elements) depending on the AL (Aggregation Level). One CCE is composed of six REGs (Resource Element Groups). One REG is defined by one OFDM symbol and one (P)RB.

[0057] PDCCH is transmitted in a CORESET (Control Resource Set). CORESET corresponds to a physical resource / parameter set used to carry PDCCH / DCI in BWP. For example, CORESET includes a REG set having a predetermined neurology (e.g., SCS, CP length, etc.). CORESET is configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. Examples of parameters / information used to configure CORESET are as follows: One or more CORESETs are configured for one UE, and multiple CORESETs are superimposed in the time / frequency domain.

[0058] -controlResourceSetId: Indicates the identification information (ID) of the CORESET.

[0059] -frequencyDomainResources: Indicates the frequency domain resources of the CORESET. It is indicated by a bitmap, and each bit corresponds to an RB group (=6 consecutive RBs). For example, the MSB (Most Significant Bit) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit whose bit value is 1 is assigned to the frequency domain resources of the CORESET.

[0060] -duration: indicates the time domain resource of CORESET. Indicates the number of consecutive OFDMA symbols that constitute CORESET. For example, duration has a value of 1 to 3.

[0061] -cce-REG-MappingType: indicates the CCE-to-REG mapping type. Interleaved and non-interleaved types are supported.

[0062] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0063] -tci-StateSPDCCH: Indicates information (e.g., TCI-StateID) indicating the TCI (Transmission Configuration Indication) state for the PDCCH. The TCI state is used to provide the Quasi-Co-Location (QCL) relationship between DL RSs and PDCCH DMRS ports in the RS set (TCI-State).

[0064] -tci-PresentInDCI: Indicates whether the TCI field in the DCI is included.

[0065] -pdcch-DMRS-ScramblingID: indicates information used to initialize the PDCCH DMRS scrambling sequence.

[0066] For PDCCH reception, the UE monitors a set of PDCCH candidates in the CORESET (e.g., blind decoding). The PDCCH candidates indicate the CCEs that the UE monitors for PDCCH reception / detection. PDCCH monitoring is performed in one or more CORESETs on an active DL BWP on each activated cell where PDCCH monitoring is configured. The set of PDCCH candidates that the UE monitors is defined as a PDCCH Search Space (SS) set. The SS set is a Common Search Space (CSS) set or a UE-specific Search Space (USS) set.

[0067] Table 6 illustrates the PDCCH search space.

[0068] [Table 6]

[0069] The SS set is configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. S (e.g., 10) or less SS sets are configured in each DL BWP of the serving cell. For example, the following parameters / information are provided for each SS set: Each SS set is associated with one CORESET, and each CORESET configuration is associated with one or more SS sets.

[0070] -searchSpaceId: Indicates the ID of the SS set.

[0071] -controlResourceSetId: Indicates the CORESET associated with the SS set.

[0072] -monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring periodicity interval (in slot units) and the PDCCH monitoring period offset (in slot units).

[0073] - monitoringSymbolsWithinSlot: indicates the first OFDMA symbol for PDCCH monitoring in a slot where PDCCH monitoring is set. Indicated by a bitmap, each bit corresponds to each OFDMA symbol in the slot. The MSB of the bitmap corresponds to the first OFDMA symbol in the slot. The OFDMA symbol corresponding to a bit whose bit value is 1 corresponds to the first symbol of the CORESET in the slot.

[0074] -nrofCandidates: Indicates the number of PDCCH candidates for AL={1, 2, 4, 8, 16} (e.g., 0, 1, 2, 3, 4, 5, 6, 8).

[0075] -searchSpaceType: Indicates whether the SS type is CSS or USS.

[0076] DCI format: Indicates the DCI format of the PDCCH candidate.

[0077] Based on the CORESET / SS set configuration, the terminal can monitor PDCCH candidates in one or more SS sets in a slot. An occasion (e.g., a time / frequency resource) for monitoring PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities are configured in a slot.

[0078] Uplink (DL) physical channels / signals

[0079] (1) PUSCH

[0080] The PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI) and is transmitted based on a CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the terminal applies transform precoding to transmit the PUSCH. As an example, when transform precoding is not possible (e.g., transform precoding is disabled), the terminal transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the terminal transmits the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH is dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Thus, PUSCH transmission is accompanied by PDCCH in dynamic scheduling, but PUSCH transmission is not accompanied by PDCCH in CS. CS includes Type-1 CG (Configured Grant) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by higher layer. In Type-2 CG, some of the parameters for PUSCH transmission are signaled by higher layer, and the rest are signaled by PDCCH. Basically, PUSCH transmission is not accompanied by PDCCH in CS.

[0081] (2)PUCCH

[0082] The PUCCH carries Uplink Control Information (UCI), which includes:

[0083] -SR (Scheduling Request): Information used to request UL-SCH resources.

[0084] -HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): A reception response signal for DL ​​signals (e.g., PDSCH, SPS release PDCCH). HARQ-ACK responses include positive ACK (simply, ACK), negative ACK (NACK), DTX (Discontinuous Transmission), or NACK / DTX. HARQ-ACK is also used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK is generated on a TB-by-TBG-by-CBG basis.

[0085] CSI (Channel Status Information): Feedback information for DL ​​channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), etc.

[0086] Table 7 shows an example of a PUCCH format. The PUCCH format is classified according to the size of the UCI payload, the transmission length (e.g., the number of symbols constituting the PUCCH resource), and the transmission structure. The PUCCH format is classified into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4) according to the transmission length.

[0087] [Table 7]

[0088] (0) PUCCH format 0 (PF0)

[0089] -Supported UCI payload size: up to K bits (e.g., K = 2)

[0090] Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

[0091] - Transmission structure: Consists of only UCI signal without DM-RS, and transmits UCI status by selecting and transmitting one of multiple sequences

[0092] (1) PUCCH format 1 (PF1)

[0093] -Supported UCI payload size: up to K bits (e.g., K = 2)

[0094] Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0095] - Transmission structure: DM-RS and UCI are configured in TDM form on different OFDM symbols, and UCI is a form in which a specific sequence is modulated (e.g., QPSK) symbol is multiplied. Both UCI and DM-RS are applied with CS (cyclic shift) / OCC (orthogonal cover code) to support CDM between multiple PUCCH resources (following PUCCH format 1) (within the same RB).

[0096] (2) PUCCH format 2 (PF2)

[0097] -Supported UCI payload size: up to K bits (e.g., K = 2)

[0098] Number of OFDM symbols constituting a single PUCCH: 1 to x symbols (e.g., X = 2)

[0099] Transmission structure: DMRS and UCI are configured / mapped in the same symbol in the form of FDM, and are transmitted by applying only IFFT to the coded UCI bits without DFT.

[0100] (3) PUCCH Format 3 (PF3)

[0101] -Supported UCI payload size: K bits or more (e.g., K = 2)

[0102] Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0103] - Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and the coded UCI bits are transmitted after applying DFT. OCC is applied to UCI before DFT, and CS (or IFDM mapping) is applied to DMRS to support multiplexing to multiple terminals.

[0104] (4) PUCCH Format 4 (PF4)

[0105] -Supported UCI payload size: K bits or more (e.g., K = 2)

[0106] Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0107] Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM form, and the coded UCI bits are transmitted without terminal multiplexing by applying DFT.

[0108] FIG 4 illustrates an ACK / NACK transmission process. Referring to FIG 4, a terminal detects a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI format 1_0, 1_1), and the PDCCH indicates DL allocation-to-PDSCH offset (K0 and PDSCH-HARQ-ACK report offset (K1). For example, DCI formats 1_0, 1_1 include the following information:

[0109] -Frequency domain resource assignment: Indicates the RB set assigned to the PDSCH.

[0110] Time domain resource assignment: K0 indicates the starting position (e.g., OFDM symbol index) and length (e.g., number of OFDM symbols) of the PDSCH within the slot.

[0111] -PDSCH-to-HARQ_feedback timing indicator: Indicates K1.

[0112] In the future, the UE receives the PDSCH at slot #(n+K0) according to the scheduling information of slot #n, and then transmits the UCI via the PUCCH at slot #(n+K1). Here, the UCI includes a HARQ-ACK response to the PDSCH. If the PDSCH is configured to transmit up to one TB, the HARQ-ACK response is configured with 1 bit. If the PDSCH is configured to transmit up to two TBs, the HARQ-ACK response is configured with 2 bits if spatial bundling is not configured, and with 1 bit if spatial bundling is configured. If the transmission time of the HARQ-ACK for multiple PDSCHs is specified as slot #(n+K1), the UCI transmitted at slot #(n+K1) includes a HARQ-ACK response for multiple PDSCHs.

[0113] 1. Wireless communication system supporting unlicensed bands

[0114] FIG. 5 shows an example of a wireless communication system supporting an unlicensed band to which the present invention can be applied.

[0115] In the following description, a cell operating in a licensed band (L-band) is defined as an L-cell, and an L-cell carrier is defined as a (DL / UL) LCC (Licensed Component Carrier). A cell operating in an unlicensed band (U-band) is defined as a U-cell, and a U-cell carrier is defined as a (DL / UL) UCC. A cell's carrier / carrier-frequency refers to the cell's operating frequency (e.g., center frequency). A cell / carrier (e.g., CC) is collectively referred to as a cell.

[0116] As shown in Figure 5(a), when a terminal and a base station transmit and receive signals using carrier-coupled LCC and UCC, the LCC is set as PCC (Primary CC) and the UCC is set as SCC (Secondary CC). As shown in Figure 5(b), a terminal and a base station can transmit and receive signals using one UCC or multiple carrier-coupled UCCs. That is, a terminal and a base station can transmit and receive signals using only UCC(s) without an LCC. For standalone operation, the UCell supports PRACH, PUCCH, PUSCH, SRS transmission, etc.

[0117] Hereinafter, the signal transmission and reception operations in the unlicensed band described in the present invention can be performed based on all the deployment scenarios described above (unless otherwise specified).

[0118] Unless otherwise stated, the following definitions apply to terms used in this specification.

[0119] -Channel: A channel is a set of consecutive RBs in a shared spectrum where a channel access process is performed. It refers to a carrier or a part of a carrier.

[0120] -Channel Access Procedure (CAP): A procedure for evaluating channel availability based on sensing to determine whether other communication nodes are using the channel before transmitting a signal. The basic unit for sensing is T sl The sensing slot has a duration of 9 us. The base station or the terminal senses the channel during the sensing slot, and the power detected for at least 4 us within the sensing slot is equal to or exceeds the energy detection threshold value X Thresh If it is smaller, the sensing slot period T sl is considered to be idle. Otherwise, the sensing slot period T sl =9us is considered busy. CAP is also known as LBT (Listen-Before-Talk).

[0121] Channel occupancy: refers to the corresponding transmission on a channel by a base station / terminal after the execution of a channel access procedure.

[0122] -Channel Occupancy Time (COT): The total time that the base station / terminal and any base station / terminal sharing the channel occupancy can transmit on the channel after the base station / terminal performs the channel access procedure. When determining the COT, if the transmission gap is 25us or less, the gap period is also counted in the COT. The COT is shared for transmission between the base station and the corresponding terminal.

[0123] DL transmission burst: Defined by a set of transmissions from a base station with no gaps of more than 16us. Transmissions from a base station separated by gaps of more than 16us are considered as individual DL transmission bursts. The base station does not sense channel availability within a DL transmission burst and transmits after the gap.

[0124] -UL transmission burst: Defined by a set of transmissions from a terminal with no gaps longer than 16us. Transmissions from a terminal separated by gaps longer than 16us are considered as individual UL transmission bursts. The terminal does not sense channel availability within a UL transmission burst and transmits after the gap.

[0125] -Detection burst: refers to a DL transmission burst including a set of signals and / or channels bounded within a (time) window and associated with a duty cycle. In an LTE-based system, a detection burst includes PSS, SSS, and CRS (cell-specific RS) as base station initiated transmissions, and further includes non-zero power CSI-RS. In an NR-based system, a detection burst includes at least SS / PBCH blocks as base station initiated transmissions, and further includes CORESET for PDCCH scheduling PDSCH with SIB1, PDSCH carrying SIB1, and / or non-zero power CSI-RS.

[0126] FIG. 6 illustrates a method of occupying resources in an unlicensed band. According to regional regulations for unlicensed bands, a communication node in an unlicensed band must determine whether other communication nodes are using the channel before transmitting a signal. Specifically, before transmitting a signal, the communication node first performs carrier sensing (CS) to determine whether other communication nodes are transmitting signals. When it is determined that other communication nodes are not transmitting signals, it is defined that a clear channel assessment (CCA) is confirmed. If there is a CCA threshold value set by a predetermined or higher layer (e.g., RRC) signaling, the communication node determines the channel state as busy when energy higher than the CCA threshold value is detected in the channel, and otherwise determines the channel state as idle. For reference, in the Wi-Fi standard (802.11ac), the CCA threshold value is specified as -62 dBm for non-Wi-Fi signals and -82 dBm for Wi-Fi signals. If the channel state is determined to be idle, the communication node starts signal transmission on the UCell. The above series of processes is called LBT (Listen-Before-Talk) or CAP (Channel Access Procedure). LBT, CAP, and CCA can be used together.

[0127] Specifically, for downlink reception / uplink transmission in an unlicensed band, any of the CAP methods described below is used in the wireless communication system associated with the present invention.

[0128] Method for transmitting downlink signal in unlicensed band

[0129] In order to transmit a downlink signal in an unlicensed band, the base station performs one of the following unlicensed band access procedures (e.g., Channel Access Procedure, CAP).

[0130] (1) Type 1 Downlink CAP Method

[0131] In Type 1 DL CAP, the length of the time interval spanned by the sensing slots sensed as idle before transmission is random. Type 1 DL CAP is applied to the following transmissions:

[0132] (i) a unicast PDSCH having user plane data, or (ii) a base station initiated transmission including a unicast PDSCH having user plane data and a unicast PDCCH scheduling user plane data, or

[0133] - Base station initiated transmissions, which may consist of (i) a detection burst only, or (ii) a detection burst multiplexed with non-unicast information.

[0134] FIG. 7 is a flowchart of a CAP operation for a base station transmitting a downlink signal in an unlicensed band.

[0135] Referring to FIG. 7, the base station first receives a delay duration T d During the sensing slot period, the channel is sensed to see if it is idle, and then when the counter N becomes 0, transmission is performed (S1234). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period according to the following procedure:

[0136] Step 1) (S1220) N=N init where N init 0 to CW p Then go to step 4.

[0137] Step 2) (S1240) If N>0 and the base station selects to decrement the counter, set N=N-1.

[0138] Step 3) (S1250) Sense the channel during the additional sensing slot period. If the additional sensing slot period is idle (Y), proceed to step 4. If not (N), proceed to step 5.

[0139] Step 4) (S1230) If N=0 (Y), end the CAP procedure (S1232). If not (N), go to step 2.

[0140] Step 5) (S1260) Additional delay period T d If a busy sensing slot is detected within the additional delay period T d Senses the channel until all sensing slots in are detected as idle.

[0141] Step 6) (S1270) Additional delay period T d If the channel is sensed as idle during all sensing slots (Y), then proceed to step 4. Otherwise (N), proceed to step 5.

[0142] Table 8 shows the channel connection priority classes that apply to the CAP. p , minimum Contention Window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are illustrated.

[0143] [Table 8]

[0144] Delay period T d is the interval T f (16us)+m p Successive sensing slot intervals T sl (9us) in that order. T f At the start of the 16us section, the sensing slot section Tsl Includes.

[0145] CW min,p ≦CW p ≦CW max,p It is. p is CW p =CW min,p and is updated before step 1 (CW size update) based on HARQ-ACK feedback (e.g., ACK or NACK ratio) for the previous DL burst (e.g., PDSCH). For example, CW p is the CW based on the HARQ-ACK feedback for the previous DL burst. min,p , or increased to the next highest allowed value, or the existing value is maintained.

[0146] (2) Type 2 Downlink (DL) CAP Method

[0147] In a Type 2 DL CAP, the length of the time interval spanned by sensing slots sensed as idle before transmission is deterministic. Type 2 DL CAPs are classified into Type 2A / 2B / 2C DL CAPs.

[0148] Type 2A DL CAP applies to the following transmissions. In Type 2A DL CAP, the base station transmits the short_dl Transmits immediately after sensing the channel is idle for T = 25us. short_dl is the interval T f (=16us) followed immediately by one sensing slot section. Tf includes the sensing slot at the start of the section.

[0149] - a base station initiated transmission having (i) only a detection burst, or (ii) a detection burst multiplexed with non-unicast information; or

[0150] - A base station transmission after a 25us gap from a terminal transmission in shared channel occupancy.

[0151] Type 2B DL ​​CAP is applicable to transmissions made by the base station after a 16us gap from a transmission by a terminal during shared channel occupancy time. In Type 2B DL ​​CAP, the base station f Transmits immediately after sensing the channel is idle for T = 16us. f includes a sensing slot within the last 9 us of the interval. Type 2C DL CAP is applicable to transmissions made by the base station after a maximum 16 us gap from a transmission by the terminal within the shared channel occupancy time. In Type 2C DL CAP, the base station does not sense the channel before transmitting.

[0152] Method for transmitting uplink signals in unlicensed bands

[0153] The terminal performs type 1 or type 2 CAP for uplink signal transmission in an unlicensed band. In general, the terminal performs CAP (e.g., type 1 or type 2) set by the base station for uplink signal transmission. For example, CAP type indication information for the terminal is included in the UL grant (e.g., DCI format 0_0, 0_1) for scheduling PUSCH transmission.

[0154] (1) Type 1 Uplink (UL) CAP Method

[0155] In Type 1 UL CAP, the length of the time interval spanned by the sensing slots sensed as idle before transmission is random. Type 1 UL CAP is applied to the following transmissions:

[0156] - PUSCH / SRS transmission scheduled and / or configured by the base station

[0157] - PUCCH transmission scheduled and / or configured by the base station

[0158] - Transmission related to RAP (Random Access Procedure)

[0159] FIG. 8 is a flowchart of Type 1 CAP operation of a terminal for transmitting an uplink signal.

[0160] Referring to FIG. 8, the terminal first receives a delay duration T d During the sensing slot period, the channel is sensed to see if it is idle, and then when the counter N becomes 0, transmission is performed (S1534). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period according to the following procedure:

[0161] Step 1) (S1520) N=N init where N init 0 to CW p Then go to step 4.

[0162] Step 2) (S1540) If N>0 and the terminal selects to decrease the counter, set N=N-1.

[0163] Step 3) (S1550) Sense the channel during the additional sensing slot period. If the additional sensing slot period is idle (Y), proceed to step 4. If not (N), proceed to step 5.

[0164] Step 4) (S1530) If N=0 (Y), end the CAP procedure (S1532). If not (N), go to step 2.

[0165] Step 5) (S1560) Additional delay period T d If a busy sensing slot is detected within the additional delay period T d Senses the channel until all sensing slots in are detected as idle.

[0166] Step 6) (S1570) Additional delay period T d If the channel is sensed as idle during all sensing slots (Y), then proceed to step 4. Otherwise (N), proceed to step 5.

[0167] Table 9 shows the channel connection priority classes that apply to the CAP. p , minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are varied.

[0168] [Table 9]

[0169] Delay period T d is the interval T f (16us)+m p Successive sensing slot intervals T sl (9us) in that order. T f At the start of the 16us section, the sensing slot section T sl Includes.

[0170] CW min,p ≦CW p ≦CW max,p It is. p is CW p =CW min,p and is updated before step 1 (CW size update) based on the explicit / implicit acknowledgement of the previous UL burst (e.g., PUSCH). For example, CW p CW based on explicit / implicit acknowledgement of previous UL bursts min,p , increased to the next highest allowed value, or left at its existing value.

[0171] (2) Type 2 Uplink (UL) CAP Method

[0172] In a type 2 UL CAP, the length of the time interval spanned by the sensing slots sensed as idle before transmission is deterministic. Type 2 UL CAP is classified into types 2A / 2B / 2C UL CAP. In a type 2A UL CAP, a terminal is required to transmit at least a sensing interval T short_dl Transmit immediately after sensing the channel is idle for T = 25us. short_dl consists of one sensing slot section immediately following the section Tf (=16us). f The sensing slot is included at the beginning of the period. In Type 2B UL CAP, the terminal starts the sensing period T f Transmits immediately after sensing the channel as idle for T = 16us. f contains a sensing slot within the last 9 us of the interval. In Type 2C UL CAP, the terminal does not sense the channel before transmitting.

[0173] RB Interlace

[0174] Figure 9 illustrates an example of RB interlace. In a shared spectrum, taking into account OCB (Occupied Channel Bandwidth) and PSD (Power Spectral Density) related regulations, a set of (equally spaced) non-contiguous (single) RBs in frequency is defined as a unit resource used / allocated for UL (physical) channel / signal transmission. For convenience, such a non-contiguous RB set is defined as an "RB interlace" (or simply, an interlace).

[0175] Referring to Figure 9, multiple RB interlaces (simply, interlaces) are defined within a frequency band. Here, the frequency band includes a (wideband) cell / CC / BWP / RB set, and the RB includes a PRB. For example, interlace #m ∈ {0, 1, ..., M-1} is composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}. M indicates the number of interlaces. A transmitter (e.g., a terminal) can transmit a signal / channel using one or more interlaces. The signal / channel includes a PUCCH or a PUSCH.

[0176] 2. Uplink transmission in unlicensed bands

[0177] The above contents (3GPP system (or NR system), frame structure, etc.) can be applied in combination with the method proposed in this specification described later, and clarify the technical features of the method proposed in this specification.

[0178] In addition, the method related to PUCCH sequence selection described later relates to uplink transmission and can be similarly applied to the uplink signal transmission method in the U-band system (unlicensed band) described above. In order to embody the technical ideas proposed in this specification in the corresponding systems, the terms, expressions, structures, etc. defined in each system may be modified or substituted.

[0179] For example, uplink transmission using a method related to PUCCH transmission described below is performed in an L-cell and / or a U-cell defined in the U-Band system.

[0180] As described above, the Wi-Fi standard (802.11ac) specifies the CCA threshold as -62 dBm for non-Wi-Fi signals and -82 dBm for Wi-Fi signals. That is, when a STA (Station) or AP (Access point) of a Wi-Fi system receives a signal from a device that does not belong to the Wi-Fi system with a power of -62 dBm or more in a specific band, the STA or AP does not transmit a signal in the specific band.

[0181] As shown in Table 7 above, in a conventional NR system, the PUCCH format consists of five formats, from PUCCH format 0 to PUCCH format 4. PUCCH formats 0, 1, and 4 are set to occupy 1 PRB, and PUCCH formats 2 and 3 are set to occupy 1 to 16 PRBs of OFDM symbols.

[0182] A PUCCH format used for the shared spectrum is proposed below. When a specific device (and / or node) transmits a signal in the shared spectrum, there may be restrictions in terms of power spectral density (PSD). For example, according to ETSI regulations, signal transmission in a specific band must meet a PSD of 10 dBm / 1 MHz. If a 15 kHz SCS is set, when a PUCCH is transmitted in PUCCH format 0 (1 PRB, 180 kHz), the maximum allowable power for the PUCCH is about 10 dBm. In general, the maximum power of a terminal is 23 dBm, and 10 dBm corresponds to an allowable power that is significantly lower than 23 dBm. When a terminal transmits a UL signal at 10 dBm, the maximum UL coverage that the terminal can support may be reduced. If a terminal transmits a PUCCH on a wider frequency domain (F-domain) to increase the transmission power, the problem of reduced UL coverage can be solved. In addition, restrictions on the shared spectrum may be restrictions in terms of occupied channel bandwidth (OCB). For example, when a device transmits a signal, the signal must occupy at least 80% of the system bandwidth. If the system bandwidth is 20MHz, the signal transmitted by the device must occupy at least 16MHz, which is 80% of 20MHz.

[0183] The above-mentioned RB interlace structure is used as a PUCCH structure considering the restrictions on PSD and OCB. For example, the PUCCH sequence of a PUCCH that is previously set to use one PRB, such as PUCCH format 0 and / or 1, is repeated in PRBs that are spaced apart at specific intervals in the frequency domain in consideration of OCB, to configure the PUCCH.

[0184] In the case of PUCCH format 2 and / or 3, 1 PRB to 16 PRBs can be set, and the PRB set in consideration of the OCB is transmitted in an interlaced form. This specification proposes a method for modifying PUCCH formats 2 and 3 so that they can be used in a shared spectrum. In this specification, 'transmitting a PUCCH format' means 'transmitting a PUCCH set in the corresponding PUCCH format'.

[0185] The terminal operation for transmitting PUCCH using UL interlaces proposed in this specification will now be described.

[0186] (1) First, the UE receives UL interlace configuration information for PUCCH format transmission from the base station, where the UL interlace configuration information includes UL interlace indexes for UL interlaces that satisfy the OCB requirements for each defined SCS. (2) Next, the UE determines at least one UL interlace based on the UL interlace configuration information. (3) Then, the UE transmits the PUCCH format to the base station using the determined at least one UL interlace.

[0187] For more specific details, please refer to the method described below. That is, the method described below can be combined with the above steps (1) to (3) to achieve the purpose / effects proposed in this specification. In this specification, 'unlicensed band' can be substituted for and mixed with 'shared spectrum'. Also, in this specification, 'LBT type' can be substituted for and mixed with 'channel access type'.

[0188] 3.1 Example 1: PUCCH format 2 / 3 enhancement for NR-U operation

[0189] In NR, PUCCH formats 2 and 3 are allocated from 1 PRB to 16 PRBs for a single UE. To maintain a UCI bit size and coding rate similar to NR, a single interlace is insufficient. Therefore, there is also ongoing discussion about PUCCH formats 2 or 3 being allocated with two interlaces.

[0190] Furthermore, in NR-U, UE multiplexing is also considered in the ePUCCH format (enhanced PUCCH format). Therefore, the following operation / setting method is proposed in relation to multiple interlace allocation and UE multiplexing.

[0191] Proposed method 1-1-1: Setting to change whether UE multiplexing is supported depending on the total number of interlaces allocated for PUCCH resources (e.g., enhanced PUCCH format 2 / 3)

[0192] 1-1-1-A. As an example, if a PUCCH resource is assigned to use one interlace, UE multiplexing is allowed; if a PUCCH resource is assigned to use more than one (or up to two) interlaces, UE multiplexing is not allowed and a single UE occupies all of the PUCCH resources.

[0193] If two interlaces (e.g., consisting of 20, 21, and 22 PRBs) are assigned to a single UE for ePUCCH format 2 / 3 transmission, the total number of PRBs exceeds 16, thereby maintaining a UCI bit size and coding rate similar to NR.

[0194] 1-1-1-B. As another example, for PUCCH format 2 / 3 with a structure supporting multiple UE multiplexing (e.g., by applying the CDM scheme), only PUCCH resources consisting of up to one interlace are configured and / or assigned to a single UE. For PUCCH format 2 / 3 with a structure not supporting multiple UE multiplexing, PUCCH resources consisting of two or more interlaces are configured and / or assigned to a single UE.

[0195] 1-1-1-C. In order to indicate proposed method 1-1, an explicit parameter (e.g., 1 bit on / off) indicating whether UE multiplexing is allowed is included in higher layer signaling (e.g., SIB or RMSI (remaining minimum system information)).

[0196] 1-1-1-D. Or the number of UEs for multiplexing (# of UEs for multiplexing), the spreading factor (e.g., OCC length), the number of interlaces for PUCCH resources (# of interlaces for PUCCH Resources), etc. are included in higher layer signaling (e.g., SIB or RMSI, etc.) to implicitly indicate whether UE multiplexing is allowed.

[0197] Proposed method 1-1-2: A method of increasing the # of PRBs (i.e., # of Interlaces) and allocating them as PUCCH resources as the number of UEs to be multiplexed increases.

[0198] 1-1-2-A. As an example, to maintain the same UCI bit size and coding rate as NR, a maximum of 16 PRBs must be reserved for the terminal. To configure N UEs to use up to 16 PRBs, a # of interlace (number of interlaces) must be assigned that reserves a total of N*16 PRBs.

[0199] The specific numbers are as follows:

[0200] When the number of terminals N=2, a maximum of 32 PRBs are required for PUCCH transmission (15 / 30 kHz SCS possible). Therefore, three (or four) interlace indexes consisting of 10 / 11 PRBs are used. When three interlaces are used, three interlaces are used, including two interlaces consisting of 11 PRBs and one interlace consisting of 10 PRBs. When four interlaces are used, four interlaces are used regardless of the number of PRBs.

[0201] When the number of terminals is N=3, a maximum of 48 PRBs is required for PUCCH transmission (15 / 30 kHz SCS possible). Therefore, five interlace indices consisting of 10 / 11 PRBs are used.

[0202] When the number of terminals N=4, a maximum of 64 PRBs is required for PUCCH transmission (15 kHz SCS possible). Therefore, 6 or 7 interlace indexes consisting of 10 / 11 PRBs are used. When 6 interlaces are used, 6 interlaces are used, including 4 interlaces consisting of 11 PRBs and 2 interlaces consisting of 10 PRBs. When 7 interlaces are used, 7 interlaces are used regardless of the number of PRBs.

[0203] When the number of terminals is N=5, a maximum of 80 PRBs are required for PUCCH transmission (15 kHz SCS is possible), so eight interlace indices consisting of 10 / 11 PRBs are used.

[0204] When the number of terminals N=6, a maximum of 96 PRBs are required for PUCCH transmission (15 kHz SCS possible). Therefore, 9 or 10 interlace indexes consisting of 10 / 11 PRBs are used. When 9 interlaces are used, 9 interlaces are used, including 6 interlaces consisting of 11 PRBs and 3 interlaces consisting of 10 PRBs. When 10 interlaces are used, 10 interlaces are used regardless of the number of PRBs.

[0205] If the number of terminals N is 7 or more, the same coding rate and supportable UCI bit size cannot be maintained.

[0206] That is, if one UE needs to occupy a maximum of 16 PRBs, then a maximum of three UEs can be muxed with a 30 kHz SCS, and a maximum of six UEs can be muxed with a 15 kHz SCS. As the number of PRBs occupied by one UE decreases, the maximum number of UEs multiplexed per SCS increases.

[0207] 1-1-2-B. As another example, for PUCCH format 2 / 3 with a structure supporting multiplexing of up to N UEs (by applying CDM scheme, etc.), a single UE is configured and / or assigned a PUCCH resource consisting of up to KxN interlaces (e.g., K=2). For PUCCH format 2 / 3 with a structure not supporting UE multiplexing, a single UE is configured and / or assigned a PUCCH resource consisting of up to K interlaces (e.g., K=2).

[0208] Furthermore, when the base station configures the terminal to configure and / or transmit multiple interlaces with a single ePUCCH Format 2 resource, and when UE multiplexing (using CDM or the like) is allowed for the multiple interlaces, the OCC index and OCC mapping method that each UE applies to UCI(REs) and DMRS(REs) must be indicated. In this regard, the following configuration / operation method is proposed. In the following description, the OCC used in the conventional system is taken into account, or a new length and type of OCC is proposed.

[0209] Proposed method 1-2-1: A method of setting multiple individual / independent (or one common) OCC indexes for each of the multiple interlaces that make up a single PUCCH resource, and applying / mapping the corresponding OCC index for each (each) interlace index

[0210] 1-2-1-A. As an example, when interlace index N and interlace index N+1 are configured and / or assigned to a single PUCCH format (e.g., PUCCH format 2) resource of a single UE, OCC index i for interlace index N is configured and OCC index j for interlace index N+1 is configured (implicitly / explicitly) independently.

[0211] In a specific embodiment, when independent OCC indices are set, each OCC is mapped to each PRB constituting each interlace, i.e., OCC index i is mapped to the PRB constituting the interlace with index N, and OCC index j is mapped to the PRB constituting the interlace with index N+1.

[0212] In yet another embodiment, when OCC index cycling is applied, which changes the OCC index (in a specific pattern) between the PRBs constituting one interlace, the set OCC index is set as the initial OCC index applied to a specific reference (e.g., having the lowest RB index) PRB within one interlace 0.

[0213] In yet another embodiment, when independent OCC indices are set, each OCC is mapped to a PRB corresponding to each interlace index by OCC index cycling based on a value specified by the base station (or based on a specific predefined value).

[0214] For an interlaced PRB with index N, if a value of k is indicated (or defined) for OCC index cycling, the PRB with the lowest (or highest) index is mapped in the order of OCC index i, OCC index i+k, OCC index i+2k, ...

[0215] On the other hand, with respect to the PRBs forming an interlace with index N+1, if a value of q is indicated (or defined) for OCC index cycling, the PRBs with the lowest (or highest) index are mapped in the order of OCC index j, OCC index j+q, OCC index j+2q, ....

[0216] 1-2-1-B. In yet another example, when interlace index N and interlace index N+1 are configured and / or assigned to a single PUCCH format (e.g., PUCCH format 2) resource of a single UE, the OCC indexes for interlace index N and interlace index N+1 are commonly set to a single OCC index i.

[0217] In a specific embodiment, when an OCC index is commonly set, a common OCC is mapped to each of the PRBs constituting each interlace. That is, OCC index i is mapped to the PRB constituting the interlace with index N, and OCC index i is also mapped to the PRB constituting the interlace with index N+1.

[0218] In yet another embodiment, when OCC index cycling is applied, which changes the OCC index (in a specific pattern) between PRBs constituting the same interlace, the set OCC index is set to the initial OCC index applied to a PRB of a specific standard (e.g., having the lowest RB index) within the interlace.

[0219] In yet another embodiment, even if the OCC index is commonly set, if the base station independently indicates (or pre-defines to be independent) values ​​for OCC index cycling, the OCC index is mapped to a PRB corresponding to each interlace index based on the common OCC index and the OCC index cycling value indicated / defined for each interlace.

[0220] That is, in relation to a PRB forming an interlace with index N, if a value of k is indicated (or defined) for the OCC index cycle, the PRB with the lowest (or highest) index is mapped in the order of OCC index i, OCC index i+k, OCC index i+2k, ....

[0221] On the other hand, with respect to the PRBs forming an interlace with index N+1, if a value of q is indicated (or defined) for OCC index cycling, the PRB with the lowest (or highest) index is mapped in the order of OCC index i, OCC index i+q, OCC index i+2q, ....

[0222] Proposed method 1-2-2: A method of setting one OCC index for multiple interlaces constituting a single PUCCH resource, and applying and / or mapping one corresponding OCC from the PRB with the lowest index (or the PRB with the highest index) regardless of the interlace index

[0223] 1-2-2-A. As an example, when interlace index N and interlace index N+1 are configured and / or assigned to a single PUCCH format 2 resource of a single UE, the OCC index for interlace index N and interlace index N+1 is set to i. Also, the OCC cycling unit and / or period is set to 10 PRBs. In this case, OCC index i is mapped to up to half (e.g., 10 PRBs) of the entire PUCCH resource (i.e., the PRBs that form interlace index N and interlace index N+1), and another OCC index (e.g., OCC index i+k) that is set independently of OCC index i is mapped to the remaining half (e.g., 10 PRBs).

[0224] In yet another example, when interlace index N and interlace index N+1 are configured and / or assigned to a single PUCCH format 2 resource of a single UE, the OCC index for interlace index N and interlace index N+1 may be set to i. In this case, the OCC cycling unit and / or period is set to the entire PRB constituting the PUCCH resource. In this case, the entire PUCCH resource is mapped to OCC index i.

[0225] In yet another embodiment, when interlace index N and interlace index N+1 are configured and / or assigned to a single PUCCH format 2 resource of a single UE, the OCC index for interlace index N and interlace index N+1 is set to i. Also, the OCC cycling unit and / or period is set to a single PRB. In this case, the PRBs that make up the interlace with index N and the interlace with index N+1 are mapped in the order of OCC index i, OCC index i+k, OCC index i+2k, ... from the PRB with the lowest (or highest) index (regardless of the interlace index) when a value of k is indicated (or defined) for OCC index cycling.

[0226] Proposed method 1-2-3: A method of setting individual / independent OCC lengths (and OCC indices based on each OCC length) for each of multiple interlaces that make up a single PUCCH resource, and applying / mapping the corresponding OCC length (and corresponding OCC index) for each (each) interlace index

[0227] According to the proposed method 1-2-3, different OCC lengths are indicated between multiple UEs multiplexed into multiple interlace indexes. As an example, interlace index N and interlace index N+1 are configured and / or assigned to a single PUCCH format 2 resource of a single UE, and OCC length=A is applied to interlace index N, and OCC length=B is applied to interlace index N+1. In this case, OCC is mapped by either of the proposed methods 1-2-1 and 1-2-2.

[0228] Furthermore, in the conventional PUCCH formats 0 / 1 / 3 / 4, in the case of a sequence for transmitting UCI and / or DMRS, a cyclic shift (CS) value is changed / applied differently (e.g., hopped to another value) between OFDM symbols for inter cell randomization. Meanwhile, in ePUCCH formats 2 / 3, frequency domain OCC is configured to be used (within one OFDM symbol) for UE multiplexing. For inter cell randomization, a method of changing an OCC index applied between OFDM symbols in which UCI information (or UCI RE or DMRS RE) is transmitted differently (e.g., hopped to another index) can be considered as follows.

[0229] Proposed method 1-3-1: A method of determining an OCC index to be applied to a specific OFDM symbol based on a combination of an OFDM symbol, a slot, and / or a cell ID in which UCI information (or UCI RE or DMRS RE) is transmitted on a PUCCH resource

[0230] Specifically, in a state where an initial OCC index to be applied to a PUCCH resource is configured by the base station, the UE applies OCC and determines an OCC index offset based on a combination of an OFDM symbol, a slot, and / or a Cell ID to which UCI information (or UCI RE or DMRS RE) is transmitted, etc. The terminal applies (e.g., adds) the determined OCC index offset to the initial OCC index and determines the calculated final OCC index as the OCC index to be applied to the OFDM symbol.

[0231] A different OCC index is always used between UCI symbols (or UCI REs or DMRS REs) transmitted by multiple UEs in the same cell, the same slot, and the same OFDM symbol.

[0232] As an example, it can be assumed that four UEs are multiplexed in cell A in the same slot and the same OFDM symbol (i.e., OCC index 0 to OCC index 3 can be used), and four UEs are also multiplexed in cell B (i.e., OCC index 0 to OCC index 3 can be used).

[0233] In this case, cell A is defined such that a UE with an initial OCC index of 0 actually uses another OCC index (e.g., 2) other than the initial OCC index 0 in a specific OFDM symbol. The other OCC index is set according to a combination of an OFDM symbol, a slot, and / or a cell ID in which a UCI symbol (or a UCI RE or a DMRS RE) is transmitted. Cell B is defined such that a UE with an initial OCC index of 0 actually uses another OCC index (e.g., 3) other than the initial OCC index 0 in the same OFDM symbol. The other OCC index is set according to a combination of an OFDM symbol, a slot, and / or a cell ID in which a UCI symbol (or a UCI RE or a DMRS RE) is transmitted.

[0234] Proposed method 1-3-2: A method for determining an OCC index to be applied to a specific PRB or interlace based on a combination of an OFDM symbol, slot, PRB, interlace, and / or cell ID in which UCI information (or UCI RE or DMRS RE) is transmitted on a PUCCH resource

[0235] Specifically, when an initial OCC index to be applied to a PUCCH resource is configured by the base station, the UE applies OCC to determine an OCC index offset according to a combination of an OFDM symbol, slot, PRB, interlace, and / or cell ID to which UCI information (or UCI RE or DMRS RE) is transmitted, etc. The terminal applies (e.g., adds) the determined OCC index offset to the initial OCC index and determines the calculated final OCC index as the OCC index to be applied to the corresponding PRB or interlace.

[0236] Different OCC indices are always used between UCI symbols (or UCI REs or DMRS REs) transmitted by multiple UEs in the same cell, the same slot and the same OFDM symbol.

[0237] In order to maintain orthogonality between CS-encoded OCCs, CS of only the same (frequency domain) samples is applied between UCI symbols (or UCI REs or DMRS REs) transmitted by multiple UEs in the same cell, same slot, and same OFDM symbol.

[0238] As an example, it can be assumed that four UEs are multiplexed in cell A (i.e., OCC index 0 to OCC index 3 can be used) and four UEs are multiplexed in cell B (i.e., OCC index 0 to OCC index 3 can be used) in the same slot and the same OFDM symbol.

[0239] In this case, cell A is defined such that a CS value actually calculated by a UE with initial OCC index 0 is only two samples. The CS value is calculated based on a combination of an OFDM symbol, slot, and / or cell ID, etc., in which a UCI symbol (or UCI RE or DMRS RE) is transmitted. Cell B is defined such that a CS value actually calculated by a UE with initial OCC index 0 is only three samples. The CS value is calculated based on a combination of an OFDM symbol, slot, and / or cell ID, etc., in which a UCI symbol (or UCI RE or DMRS RE) is transmitted. Since OCCs having different CS values ​​are used between cells, the effect of inter cell randomization is further improved.

[0240] 2.2. Example 2: Actually-used PRBs in enhanced PUCCH format 2 / 3 enhancement in NR-U

[0241] In NR, after the base station allocates UL resources for the terminal's PUCCH format 2 / 3 transmission, the actually-used PRBs are calculated based on the UCI size and coding rate that the terminal should actually transmit. If the number of actually-used PRBs is less than the PRBs corresponding to the UL resources specified by the base station, the terminal performs PUCCH transmission only for the actually-used PRBs and does not use the remaining PRBs. The base station can also know this in advance, and the corresponding remaining PRBs are used for other UL resources. The remaining PRBs may be dropped.

[0242] In ePUCCH format 2 / 3 in a shared spectrum, an operation is applied in which only a part of the allocated PRBs is used. Characteristically, a certain interlace index (by SCS) is composed of 11 PRBs, but the OCB requirement can be satisfied with only 10 PRBs. Therefore, if an interlace index composed of 11 PRBs is assigned to a terminal from a base station to transmit ePUCCH format 2 / 3, and the terminal calculates the actually-used PRB based on the UCI size and coding rate to be actually transmitted and obtains 10 PRBs, the terminal drops 1 PRB and transmits PUCCH using only 10 PRBs. The base station can also know this in advance, and the corresponding 1 PRB is used for other UL resources. Characteristically, the dropped 1 PRB is combined with a PRB present in an inter carrier guard band present between LBT subbands and is used as a resource capable of transmitting PUSCH, etc., according to a conventional system.

[0243] This can be extended to the case where multiple interlace indexes are indicated. If the base station allocates multiple interlace indexes M consisting of 11 PRBs to the PUCCH resource, and the terminal calculates the actually-used PRB based on the UCI size and coding rate to be actually transmitted, and there are fewer PRBs than 11*M, the terminal can drop one PRB with the highest (or lowest) index of the highest (or lowest) interlace index. If there are two or more PRBs to be dropped, the highest (or lowest) PRB is dropped in the order of the second highest (or lowest) and third highest (or lowest) interlace indexes.

[0244] Furthermore, when the base station indicates multiple interlace indexes, each interlace index is composed of 10 or 11 PRBs, and therefore, the following methods can be used for setting according to each case.

[0245] 2-1-1. When the interlaces corresponding to the multiple interlace indexes specified by the base station are composed of the same number of PRBs, if the number of actually-used PRBs calculated by the terminal is allowed to drop one or more interlaces, the terminal drops the highest (or lowest) interlace index. In other words, if the number of actually-used PRBs calculated by the terminal is less than the number of PRBs of one interlace, the terminal can drop the highest (or lowest) interlace index. For example, when multiple interlaces are composed of only 10 PRBs each, if the number of actually-used PRBs calculated by the terminal is 10 or more less than the total number of PRBs specified, i.e., if the number of actually-used PRBs is less than 10, the terminal transmits PUCCH through the remaining interlaces except for the interlace with the highest index. When multiple interlaces are each composed of only 11 PRBs, if the number of actually-used PRBs calculated by the terminal is 11 or more less than the specified total number of PRBs, i.e., if the number of actually-used PRBs is 11 or less, the terminal transmits PUCCH through the remaining interlaces except for the interlace with the highest index.

[0246] As an example, if the base station indicates two interlaces and the actually-used PRB value actually calculated by the terminal is less than or equal to the number of PRBs constituting one interlace, the terminal drops one interlace with a relatively high index. The terminal transmits PUCCH using only the remaining interlace with a relatively low index. Whether the number of actually-used PRBs is less than or equal to the number of PRBs of one interlace is calculated based on the UCI size and coding rate that the terminal should actually transmit, as described above. The UCI size takes into account the number of HARQ-ACK bits to be transmitted and the number of CRC bits to be added.

[0247] 2-1-2. When multiple interlace indexes indicated by the base station include interlaces consisting of different numbers of PRBs (i.e., when one interlace is composed of 10 PRBs and another is composed of 11 PRBs), if the actually-used PRB value calculated by the terminal can drop one or more interlaces (i.e., when the actually-used PRB value is 10 or 11 or more smaller than the total PRB value of the indicated multiple interlaces), the terminal selects the interlace index corresponding to the actually required PRB value and transmits the PUCCH.

[0248] As an example, if the base station commands two interlaces (one interlace with 10 PRBs and one interlace with 11 PRBs),

[0249] If the actually-used PRB value actually calculated by the terminal is less than or equal to 11 (or is 11), the terminal may select an interlace consisting of 11 PRBs to transmit the PUCCH. The terminal may drop the interlace consisting of 10 PRBs. If the actually-used PRB value is greater than 11, the terminal may transmit the PUCCH using both two interlaces.

[0250] If the actually-used PRB value actually calculated by the terminal is less than or equal to 10 (or is 10), the terminal selects an interlace consisting of 10 PRBs to transmit the PUCCH. The terminal may drop the interlace consisting of 11 PRBs. If the actually-used PRB value is 11, the terminal may be configured to select an interlace consisting of 11 PRBs to transmit the PUCCH. The terminal may drop the interlace consisting of 10 PRBs. If the actually-used PRB value is greater than 11, the terminal may transmit the PUCCH using all two interlaces.

[0251] Furthermore, depending on the setting of an intra-carrier guard band, the total number of PRBs constituting a specific LBT subband may be less than 50 based on 30 kHz (or less than 100 based on 15 kHz). In this case, the number of PRBs constituting an interlace is 10 or 9 depending on the interlace index. Therefore, when multiple interlace indices (e.g., 2) are indicated and / or configured for a single PUCCH resource, the interlace of each index is composed of 10 or 9 (or 11) PRBs, and the following operation is defined taking into account OCB requirements, etc.

[0252] 2-2-1. Method for allocating at least one interlace index constituting each PUCCH resource to satisfy OCB requirements

[0253] As an example, an interlace consisting of 10 (or 11) PRBs meets the OCB requirements, while an interlace consisting of 9 PRBs does not meet the OCB requirements, so when a base station configures / sets one PUCCH resource with multiple interlaces, at least one interlace index can be set to correspond to an interlace consisting of 10 (or 11) PRBs.

[0254] 2-2-2. Method of allocating multiple interlace indexes that make up each PUCCH resource to meet OCB requirements

[0255] As an example, the base station may use two interlace indexes consisting of nine PRBs to allocate PUCCH resources to meet the OCB requirements.

[0256] 2-2-3. When multiple interlace indexes specified by the base station consist of only the same number of PRBs (i.e., when they consist of only 10 PRBs or only 9 (or 11) PRBs), if the number of actually-used PRBs calculated by the terminal may drop one or more interlaces (i.e., when the number of actually-used PRBs is smaller than the total number of PRBs of the specified multiple interlaces by more than the number of PRBs per interlace (e.g., 10, 9, or 11)), the terminal can drop the interlace with the highest (or lowest) index.

[0257] As an example, if the base station indicates two interlaces (e.g., two interlaces consisting of 10 PRBs, or two interlaces consisting of 9 PRBs, or two interlaces consisting of 11 PRBs), and the number of actually-used PRBs calculated by the terminal is less than or equal to 10 (or 9 or 11), the terminal drops the interlace with the highest (or lowest) index and transmits the PUCCH using only the remaining interlace index.

[0258] In this case, if each interlace consists of only 9 PRBs and / or one of the two interlaces should be dropped, this can be applied in general cases, but it is specifically applicable to cases where it is acceptable to only temporarily fill the 2 MHz OCB (e.g., CO sharing).

[0259] 2-2-4. When multiple interlace indexes specified by the base station include interlaces consisting of different numbers of PRBs (i.e., when a specific interlace is composed of 10 PRBs and another interlace is composed of 9 (or 11) PRBs), if the number of actually-used PRBs calculated by the terminal may drop one or more interlace indexes (i.e., when the number of actually-used PRBs is 10 or 9 (or 11) or more less than the total number of PRBs of the specified multiple interlaces), the terminal selects an interlace index corresponding to the actually required PRB value and transmits PUCCH. Alternatively, the terminal operates to preferentially drop interlace indexes consisting of fewer PRBs and preferentially use interlace indexes consisting of more PRBs for transmission.

[0260] 2-2-4-A. As an example, if the base station instructs two interlaces (one interlace consisting of 10 PRBs and one interlace consisting of 9 PRBs),

[0261] If the number of actually-used PRBs calculated by the terminal is less than or equal to 10 (even less than or equal to 9), the terminal preferentially selects an interlace index (i.e., an interlace index consisting of 10 PRBs) that satisfies the OCB requirements to transmit the PUCCH. The terminal drops the interlace consisting of 9 PRBs. If the number of actually-used PRBs is greater than 10, the terminal transmits the PUCCH using both interlaces.

[0262] If the number of actually-used PRBs actually calculated by the terminal is less than or equal to 9 and / or if only 2 MHz OCB may be temporarily satisfied (e.g., CO sharing), the terminal selects an interlace consisting of 9 PRBs to transmit the PUCCH. The terminal may drop an interlace consisting of 10 PRBs. If the number of actually-used PRBs is 10, the terminal selects an interlace consisting of 10 PRBs to transmit the PUCCH. The terminal may drop an interlace consisting of 9 PRBs. If the number of actually-used PRBs is greater than 10, the terminal uses all two interlaces to transmit the PUCCH.

[0263] 2-2-4-B. As yet another example, if the base station instructs two interlaces (one interlace consisting of 10 PRBs and one interlace consisting of 11 PRBs),

[0264] If the number of actually-used PRBs calculated by the terminal is less than or equal to 11 (even less than or equal to 10), the terminal preferentially selects an interlace consisting of 11 PRBs to transmit the PUCCH. The terminal may drop an interlace consisting of 10 PRBs. If the number of actually-used PRBs is greater than 11, the terminal transmits the PUCCH using both interlaces.

[0265] Meanwhile, when an unused interlace index is selected in the proposed method, the last index of the indices in the RRC configuration may be the highest interlace index, and the first index of the indices in the RRC configuration may be the lowest interlace index. Specifically, if two interlaces are configured by the RRC configuration, the interlace set to interlace0 in the RRC configuration is the interlace with the lowest interlace index, and the interlace set to interlace1 in the RRC configuration is the interlace with the highest interlace index.

[0266] PRB adaptation mechanism of enhanced PUCCH format 3 based on UE multiplexing

[0267] Meanwhile, in ePUCCH format 3, DFT is performed after UCI is included in the total available PRB size before resource mapping. If a single UE uses all the configured PUCCH resources without UE multiplexing, the above-mentioned actually-used PRB setting method can be applied. However, if two or more UEs are multiplexed using ePUCCH format 3, a problem occurs in that DFT is performed except for a specific PRB because DFT needs to be performed before resource mapping. Therefore, if UE multiplexing is allowed, the RB adaptation method may not be used in ePUCCH format 3. That is, parameters related to RB adaptation permission may be explicitly included in higher layer signaling (e.g., SIB or RMSI, etc.). RB adaptation permission of the terminal may be implicitly determined according to parameters related to UE multiplexing (e.g., the number of speeding factors, # of UE for multiplexing).

[0268] More specifically, in the case of PUCCH format 3, the front end of the DFT supports CDM-based UE multiplexing (e.g., by applying OCC), or omits CDM-based UE multiplexing and supports only a single UE. When DFT is performed across multiple interlaces with multiple interlaces configured and / or assigned to a single PUCCH format 3 resource of a single UE, whether RB adaptation is permitted according to the actual UCI payload and maximum UCI coding rate of the UE changes depending on whether CDM application (based on OCC application) is configured at the front end of the DFT. As described above, RB adaptation refers to an operation of using only the minimum number of RBs capable of transmitting the corresponding actual UCI payload while satisfying the maximum UCI coding rate within the configured RB set. As an example, when CDM-based UE multiplexing at the front end of the DFT is not supported for a PUCCH format 3 resource based on multiple interlaces, RB adaptation is performed. When CDM-based UE multiplexing at the front end of DFT is applied to multiple interlace-based PUCCH format 3 resources, RB adaptation is not performed and UCI is always transmitted using all of the configured RB set regardless of the actual UCI payload size.

[0269] In yet another method, when multiple interlaces are configured and / or assigned to a single PUCCH format 3 resource of a single UE, DFT is performed independently for each interlace. Whether or not OCC-based CDM is applied, an applied OCC index, an OCC length, etc. are configured individually / independently for each interlace (or commonly for multiple interlaces). Furthermore, RB adaptation may be performed on an interlace basis regardless of whether or not OCC-based CDM is applied. As described above, RB adaptation refers to an operation of using only the minimum number of RBs capable of transmitting the corresponding actual UCI payload while satisfying the maximum UCI coding rate within the configured RB set.

[0270] 2.3. Example 3: Pairing method of OCC index used for UCI RE and OCC index used for DMRS RE in Enhanced PUCCH format 2

[0271] Conventionally, in NR PUCCH format 4, the OCC index used for the UCI symbol and the cyclic shift index used for the DMRS symbol are defined as shown in Table 10. If two UEs are multiplexed at once, {OCC index 0 and cyclic shift 0} and {OCC index 1 and cyclic shift 6} are paired. If four UEs are multiplexed at once, {OCC index 0 and cyclic shift 0}, {OCC index 1 and cyclic shift 6}, {OCC index 2 and cyclic shift 3}, and {OCC index 3 and cyclic shift 9} are paired.

[0272] [Table 10]

[0273] Meanwhile, in ePUCCH format 2, up to four UEs (i.e., one, two, or four UEs can share the same resource) are multiplexed. In this case, ePUCCH format 2 performs multiplexing using OCCs in both UCI REs and DMRS REs, so pairing between each OCC needs to be defined.

[0274] As an example, the OCC for UCI RE is defined according to the number of UEs to be multiplexed as shown in Table 11 and Table 12. Table 11 shows the OCC when two UEs are multiplexed, and Table 12 shows the OCC when four UEs are multiplexed.

[0275] [Table 11]

[0276] [Table 12]

[0277] At this time, w n (i) denotes an OCC index that maps to a UCI RE. In the first method, the same OCC indexes are paired with each other as shown in Table 13. In this case, wn(i) denotes an OCC index that maps to a DMRS RE.

[0278] [Table 13]

[0279] In yet another method, as in Table 14 or Table 15, the OCC index between the UCI and the DMRS is paired to different values.

[0280] [Table 14]

[0281] [Table 15]

[0282] Example

[0283] "figure 10 1 is a flowchart showing a signal transmission and reception method according to an embodiment of the present invention.

[0284] "figure 10 Referring to the above, an embodiment of the present invention is performed by a terminal, The method includes the steps of receiving information about a PUCCH resource (S1001) and transmitting a PUCCH including the UCI based on the information about the PUCCH resource (S1003).

[0285] The format for transmitting the PUCCH is based on any of the methods proposed in the first to third embodiments.

[0286] For example, the terminal determines the interlace for PUCCH transmission based on the second embodiment.

[0287] For example, when the PUCCH format is configured based on 2-1-1 of Example 2, the interlace on which the terminal transmits the PUCCH is determined to be the first interlace among the first interlace and the second interlace based on (i) the index of the first interlace is set lower than the index of the second interlace due to the settings for the first interlace and the second interlace, and (ii) the number of PRBs for transmitting UCI is less than or equal to the number of PRBs of the first interlace.

[0288] Whether the number of PRBs for transmitting UCI is equal to or smaller than the number of PRBs in the first interlace is determined based on the size of the UCI and the coding rate.

[0289] The index of the first interlace and the index of the second interlace are set based on Radio Resource Control (RRC) signaling that includes configuration for the first interlace and the second interlace.

[0290] The first interlace and the second interlace include the same number of PRBs.

[0291] The PUCCH is transmitted based on a specific PUCCH format, which includes PUCCH format 2 and PUCCH format 3.

[0292] "figure 10 In addition to the operations described in relation to FIG. 9 The operation described in the first embodiment and / or the operation described in the first to third embodiments may be combined and performed. For example, the terminal performs an uplink LBT before transmitting a PUCCH."

[0293] An example of a communication system to which the present invention is applied

[0294] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or flow charts of the present invention disclosed in this specification may be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0295] Hereinafter, a more detailed description will be given with reference to the drawings. In the following drawings / description, the same reference numerals denote the same or corresponding hardware blocks, software blocks or function blocks, unless otherwise specified.

[0296] FIG. 12 illustrates a communication system 1 to which the present invention is applied.

[0297] Referring to FIG. 12, the communication system 1 applied to the present invention includes wireless devices, base stations, and networks. Here, the wireless devices refer to devices that communicate using wireless connection technology (e.g., 5G NR, LTE), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, vehicles 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held Device) 100d, a home appliance 100e, an IoT (Internet of Thing) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication functions, autonomous vehicles, vehicles capable of inter-vehicle communication, and the like. Here, the vehicles include UAVs (Unmanned Aerial Vehicles) (e.g., drones). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital billboards, vehicles, robots, etc. Portable devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebook computers, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0298] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. AI (Artificial Intelligence) technology is applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, the vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, an IoT device (e.g., a sensor) can directly communicate with another IoT device (e.g., a sensor) or another wireless device 100a to 100f.

[0299] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f / base stations 200 and the base stations 200. Here, the wireless communication / connections are performed by various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication) and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and base stations, and the base stations and base stations can transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, based on various proposals of the present invention, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed.

[0300] Examples of wireless devices to which the present invention can be applied

[0301] FIG. 13 illustrates a wireless device to which the present invention can be applied.

[0302] 13, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals using various wireless access technologies (e.g., LTE, NR), where {first wireless device 100, second wireless device 200} corresponds to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG.

[0303] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate a first information / signal, and then transmits a wireless signal including the first information / signal via the transceiver 106. The processor 102 also receives a wireless signal including a second information / signal via the transceiver 106, and then stores information obtained from signal processing of the second information / signal in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as an RF (radio frequency) unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0304] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate a third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from the signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0305] The hardware elements of the wireless device 100, 200 are described in more detail below. One or more protocol layers may be implemented by one or more processors 102, 202, without limitation. For example, the one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions, and / or methods disclosed herein to the one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and derive the PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed herein.

[0306] The one or more processors 102, 202 may also be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, the one or more processors 102, 202 may include 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). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like. The firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202, or may be stored in one or more memories 104, 204 and run by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this specification may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0307] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0308] The one or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, etc., as described in the methods and / or flow charts, etc., herein to one or more other devices. The one or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, suggestions, methods and / or flow charts, etc., disclosed herein from one or more other devices. For example, the one or more transceivers 106, 206 may be coupled to one or more processors 102, 202 and may transmit and receive wireless signals. For example, the one or more processors 102, 202 may control the one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, the one or more processors 102, 202 may control the one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Also, the one or more transceivers 106, 206 are coupled to one or more antennas 108, 208, and the one or more transceivers 106, 206 are configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed herein, via the one or more antennas 108, 208. In this specification, the one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing by the one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed by the one or more processors 102, 202, from baseband signals to RF band signals. To this end, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0309] Examples of use of wireless devices to which this invention can be applied

[0310] 14 shows another example of a wireless device to which the present invention is applied. The wireless device may be embodied in various forms depending on the use case / service (see FIG. 12).

[0311] Referring to Fig. 14, the wireless device 100, 200 corresponds to the wireless device 100, 200 of Fig. 13 and is composed of various elements, components, units / parts and / or modules. For example, the wireless device 100, 200 includes a communication unit 110, a control unit 120, a memory unit 130 and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102, 202 and / or one or more memories 104, 204 in Fig. 13. For example, the transceiver 114 includes one or more transceivers 106, 206 and / or one or more antennas 108, 208 in Fig. 13. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130 and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls electrical / mechanical operations of the wireless device based on the programs / codes / commands / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface, or stores information received from the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0312] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. The wireless device may be embodied in the form of, but is not limited to, a robot (FIG. 12, 100a), a vehicle (FIG. 12, 100b-1, 100b-2), an XR device (FIG. 12, 100c), a mobile device (FIG. 12, 100d), a home appliance (FIG. 12, 100e), an IoT device (FIG. 12, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a Fintech device (or a financial device), a security device, a climate / environment device, an AI server / device (FIG. 12, 400), a base station (FIG. 12, 200), and a network node. The wireless device may be mobile or fixed depending on the use case / service.

[0313] In FIG. 14, the various elements, components, units / sections and / or modules within the wireless devices 100, 200 are all coupled to each other by wired interfaces or at least some are wirelessly coupled to each other by a 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 a first unit (e.g., 130, 140) are connected wirelessly via the communication unit 110. In addition, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is composed of a set of one or more processors. For example, the control unit 120 is composed of a set of a communication control processor, an application processor, an ECU (Electronic control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 is composed of a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0314] Examples of vehicles or autonomous vehicles to which the present invention can be applied include

[0315] 15 is a diagram illustrating a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be realized as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0316] 15, a vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 14, respectively.

[0317] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a causes the vehicle or autonomous vehicle 100 to run on the ground. The driving unit 140a includes an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d embodies a technology for maintaining a lane while driving, a technology for automatically adjusting speed such as an adaptive cruise control, a technology for automatically driving according to a predetermined route, a technology for automatically setting a route when a destination is set, and the like.

[0318] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a drive plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., speed / direction adjustment) so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving route according to the drive plan. The communication unit 110 non-periodically obtains the latest traffic information data from an external server during autonomous driving, and also obtains surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and the drive plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, the autonomous driving route, the drive plan, etc. to the external server. The external server can predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0319] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be interpreted as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention. [Industrial Applicability]

[0320] As mentioned above, the present invention may be applied to a variety of wireless communication systems.

Claims

1. A method for transmitting an uplink signal by a user equipment (UE) operating in a wireless communication system, comprising: receiving information about a physical uplink control channel (PUCCH) resource included in a radio resource control (RRC) signaling; transmitting a PUCCH including uplink control information (UCI) based on the information on the PUCCH resource; The UCI includes HARQ-ACK information, Based on the first interlace and the second interlace being configured for the PUCCH according to the information regarding the PUCCH resource included in the RRC signaling, based on a first value determined based on a payload size of the UCI being equal to or smaller than a second value determined based on a number of PRBs (Physical Resource Blocks) of the first interlace, the PUCCH is transmitted via the first interlace among the first interlace and the second interlace; based on the first value being greater than the second value, the PUCCH is transmitted via the first interlace and the second interlace; The PUCCH is transmitted via one interlace based on one interlace being configured for the PUCCH by the information on the PUCCH resource included in the RRC signaling; the number of PRBs for the first interlace is 10 or 11; The PUCCH is transmitted based on PUCCH format 2 or PUCCH format 3, The index of the second interlace and the index of the first interlace are defined based on the RRC signaling including the information regarding the PUCCH resource; The method, wherein the index of the second interlace is higher than the index of the first interlace.

2. The method of claim 1 , wherein whether the first value is less than or equal to the second value is determined based on the payload size and a coding rate of the UCI.

3. A user equipment (UE) configured to transmit uplink signals in a wireless communication system, At least one transceiver; At least one processor; at least one memory operatively coupled to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations; The operation includes: Receiving information regarding a PUCCH (Physical Uplink Control Channel) resource included in RRC (Radio Resource Control) signaling; Transmitting a PUCCH including uplink control information (UCI) based on the information regarding the PUCCH resource; The UCI includes HARQ-ACK information, Based on the first interlace and the second interlace being configured for the PUCCH according to the information on the PUCCH resource included in the RRC signaling, based on a first value determined based on a payload size of the UCI being equal to or smaller than a second value determined based on a number of PRBs (Physical Resource Blocks) of the first interlace, the PUCCH is transmitted via the first interlace among the first interlace and the second interlace; based on the first value being greater than the second value, the PUCCH is transmitted via the first interlace and the second interlace; The PUCCH is transmitted via one interlace based on one interlace being configured for the PUCCH by the information on the PUCCH resource included in the RRC signaling; the number of PRBs for the first interlace is 10 or 11; The PUCCH is transmitted based on PUCCH format 2 or PUCCH format 3, The index of the second interlace and the index of the first interlace are defined based on the RRC signaling including the information regarding the PUCCH resource; The index of the second interlace is higher than the index of the first interlace, the UE.

4. The UE of claim 3 , wherein whether the first value is less than or equal to the second value is determined based on the payload size and a coding rate of the UCI.

5. An apparatus for a UE (user equipment), comprising: At least one processor; at least one computer memory operatively coupled to the at least one processor and configured, when executed, to cause the at least one processor to perform operations; The operation includes: Receiving information regarding a PUCCH (Physical Uplink Control Channel) resource included in RRC (Radio Resource Control) signaling; Transmitting a PUCCH including uplink control information (UCI) based on the information regarding the PUCCH resource; The UCI includes HARQ-ACK information, Based on the first interlace and the second interlace being configured for the PUCCH according to the information regarding the PUCCH resource included in the RRC signaling, based on a first value determined based on a payload size of the UCI being equal to or smaller than a second value determined based on a number of PRBs (Physical Resource Blocks) of the first interlace, the PUCCH is transmitted via the first interlace among the first interlace and the second interlace; based on the first value being greater than the second value, the PUCCH is transmitted via the first interlace and the second interlace; The PUCCH is transmitted via one interlace based on one interlace being configured for the PUCCH by the information on the PUCCH resource included in the RRC signaling; the number of PRBs for the first interlace is 10 or 11; The PUCCH is transmitted based on PUCCH format 2 or PUCCH format 3, The index of the second interlace and the index of the first interlace are defined based on the RRC signaling including the information regarding the PUCCH resource; The index of the second interlace is higher than the index of the first interlace.

6. The apparatus of claim 5 , wherein whether the first value is less than or equal to the second value is determined based on the payload size and a coding rate of the UCI.

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