Method performed by terminal or base station in wireless communication system, and device therefor

Abstract

A method performed by a terminal according to an embodiment of the present disclosure may comprise: receiving, through higher layer signaling, configuration information for a table configured such that each row has a plurality of fields for a plurality of cells; receiving downlink control information (DCI) for multi-cell scheduling; and determining bandwidth parts (BWPs) of cells scheduled together through the DCI on the basis of BWP indication information of the DCI, wherein BWP-specific parameters configured in the plurality of fields included in each row of the table are interpreted on the basis of the determined BWPs, and the size of each of the plurality of fields is determined on the basis of a BWP requiring the largest number of bits to indicate a BWP-specific parameter among BWPs configured in each cell.

Description

Method performed by a terminal or base station in a wireless communication system and device therefor

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method for transmitting or receiving an uplink / downlink wireless signal by a terminal or base station in a wireless communication system, and a device therefor.

[0002] Wireless communication systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA).

[0003] In Rel.18 NR, the introduction of multi-cell scheduling (MC) DCI for scheduling multiple cells with a single DCI is being discussed.

[0004] The technical challenge to be addressed is to provide a method and a device for efficiently performing wireless signal transmission and reception processes. For example, a method and a device for more efficiently performing upper-layer signaling related to multi-cell scheduling DCI may be provided.

[0005] The technical challenges to be achieved are not limited to these, and other technical challenges not mentioned can be inferred from the description below.

[0006] A method performed by a terminal according to one aspect of the present disclosure comprises: receiving configuration information for a table, each row of which is configured to have a plurality of fields for a plurality of cells, through upper layer signaling; receiving downlink control information (DCI) for multi-cell scheduling; and determining bandwidth part (BWP) of cells scheduled together through the DCI based on BWP indication information of the DCI, wherein BWP-specific parameters set in the plurality of fields included in each row of the table are interpreted based on the determined BWPs, and the size of each of the plurality of fields can be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set for each cell.

[0007] The size of a first field for a first cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set in the first cell. The size of a second field for a second cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set in the second cell.

[0008] To indicate the above BWP-specific parameters, based on the fact that L-bits are required in the first BWP of the first cell, M-bits are required in the second BWP of the first cell, and N-bits are required in the third BWP of the first cell, the size of the first field for the first cell among the plurality of fields may be determined as the largest number of bits among L-bits, M-bits, and N-bits.

[0009] For a first cell among the plurality of cells, Y bits are required to indicate the BWP-specific parameter for BWP #A determined based on the BWP indication information, and based on the size of a first field for the first cell among the plurality of fields being determined to be X bits larger than the Y bits, the terminal can obtain the first BWP-specific parameter for the BWP #A of the first cell by selecting Y bits from the X bits of the first field. The Y bits selected from the X bits of the first field may be Y least significant bits (LSBs).

[0010] The above DCI may include information for indicating one row in the above table.

[0011] The DCI may schedule physical downlink shared channels (PDSCHs) or physical uplink shared channels (PUSCHs) for the co-scheduled cells. The DCI may include minimum scheduling offset indication information related to a minimum scheduling offset from the DCI to the PDSCHs or the PUSCHs. Whether the minimum scheduling offset is set or the value of the minimum scheduling offset may be the same for the co-scheduled cells. The minimum scheduling offset may be a minimum K0 or a minimum K2. The minimum K0 may be related to a DCI-to-PDSCH offset. The minimum K2 may be related to a DCI-to-PUSCH offset. The value of the minimum scheduling offset is for the multi-cell scheduling, and the value of the minimum scheduling offset for the multi-cell scheduling may be set separately from minimum scheduling offset values ​​for single-cell scheduling.

[0012] According to another aspect of the present disclosure, a non-transitory computer-readable recording medium having recorded thereon instructions configured to cause a terminal to perform the method described in claim 1 when executed by a processor of the terminal may be provided.

[0013] According to another aspect of the present disclosure, a device includes a memory for storing commands; and a processor for performing operations by executing the commands, wherein the operations of the processor include receiving, through upper layer signaling, configuration information for a table configured such that each row has a plurality of fields for a plurality of cells; receiving downlink control information (DCI) for multi-cell scheduling; and determining bandwidth part (BWP) indication information of cells scheduled together through the DCI based on BWP indication information of the DCI, wherein BWP-specific parameters set in the plurality of fields included in each row of the table are interpreted based on the determined BWPs, and the size of each of the plurality of fields can be determined based on a BWP that requires the largest number of bits to indicate a BWP-specific parameter among BWPs set for each cell.

[0014] The above device further includes a transceiver, and the device may be a terminal for wireless communication.

[0015] The above device may be a processing device configured to control a terminal for wireless communication.

[0016] According to another aspect of the present disclosure, a method performed by a base station includes transmitting, through upper layer signaling, configuration information for a table configured such that each row has a plurality of fields for a plurality of cells; and transmitting a DCI for multi-cell scheduling, wherein based on BWP (bandwidth part) indication information of the DCI, BWPs of cells scheduled together are indicated through the DCI, and BWP-specific parameters set in the plurality of fields included in each row of the table are interpreted based on the indicated BWPs, and a size of each of the plurality of fields can be determined based on a BWP that requires the largest number of bits to indicate a BWP-specific parameter among BWPs set for each cell.

[0017] According to another aspect of the present disclosure, a base station includes a memory for storing commands; and a processor for performing operations by executing the commands, wherein the operations of the processor include transmitting configuration information for a table, each row of which is configured to have a plurality of fields for a plurality of cells, through upper layer signaling; and transmitting a DCI for multi-cell scheduling, wherein BWPs of cells scheduled together are indicated through the DCI based on BWP (bandwidth part) indication information of the DCI, and BWP-specific parameters set in the plurality of fields included in each row of the table are interpreted based on the indicated BWPs, and the size of each of the plurality of fields can be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set for each cell.

[0018] According to at least one of various embodiments, a wireless communication system can efficiently perform wireless signal transmission and reception. According to one embodiment, when setting a table for multiple cells in upper layer signaling related to multi-cell scheduling DCI, by setting the size of the per-cell information field of the table to the maximum number of bits for BWPs of the corresponding cell, scheduling constraints for information per BWP of each cell provided through the multi-cell scheduling DCI can be minimized.

[0019] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be inferred from the description below.

[0020] Figure 1 illustrates physical channels used in a 3GPP system, which is an example of a wireless communication system, and a general signal transmission method using the channels.

[0021] Figure 2 illustrates the structure of a radio frame.

[0022] Figure 3 illustrates a resource grid of slots.

[0023] Figure 4 illustrates an example of physical channels being mapped within a slot.

[0024] Figure 5 illustrates the PDCCH / PDSCH reception and ACK / NACK transmission process.

[0025] Figure 6 illustrates a PUSCH (Physical Uplink Shared Channel) transmission process.

[0026] Figure 7 shows an example of carrier aggregation.

[0027] Figure 8 illustrates a wireless communication system supporting an unlicensed band.

[0028] Figure 9 illustrates a method of occupying resources within an unlicensed band.

[0029] FIGS. 10 to 12 are diagrams each illustrating a field structure and field interpretation in a multi-cell scheduling DCI according to one embodiment.

[0030] FIG. 13 is a diagram for explaining a table configuration for multi-cell scheduling DCI according to one embodiment.

[0031] Fig. 14 is a diagram for explaining signal transmission and reception between a network and a terminal according to one embodiment.

[0032] Figure 15 illustrates a flow of a method performed by a terminal according to one embodiment.

[0033] FIG. 16 illustrates a flow of a method performed by a base station according to one embodiment.

[0034] Figures 17 to 20 illustrate a communication system (1) and a wireless device applicable to the present disclosure.

[0035] The following technologies can be used in various wireless access systems, such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with radio technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented with radio technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented with radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) 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.

[0036] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing Radio Access Technology (RAT) is emerging. Furthermore, massive Machine Type Communications (MTC), which connects multiple devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation RATs, such as enhanced Mobile BroadBand Communication (eMBB), massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC), is being discussed. For convenience, these technologies are referred to as NR (New Radio or New RAT) in this specification.

[0037] For clarity of explanation, the description will focus on 3GPP NR, but the technical idea of ​​the present invention is not limited thereto.

[0038] In this specification, the expression "setting" can be replaced with the expression "configure / configuration", and the two can be used interchangeably. In addition, conditional expressions (e.g., "if", "in a case", or "when", etc.) can be replaced with the expression "based on that ~~" or "in a state / status". In addition, the operation of the terminal / base station or the SW / HW configuration according to the satisfaction of the condition can be inferred / understood. In addition, if the process of the receiving (or transmitting) side can be inferred / understood from the process of the transmitting (or receiving) side in signal transmission / reception between wireless communication devices (e.g., base stations, terminals), the description thereof can be omitted. For example, signal determination / generation / encoding / transmission, etc. of the transmitting side can be understood as signal monitoring reception / decoding / determination, etc. of the receiving side. In addition, the expression that the terminal performs (or does not perform) a specific operation can also be interpreted as meaning that the base station operates upon expecting / assuming (or expecting / assuming that the terminal does not perform) the specific operation. In addition, the expression that the base station performs (or does not perform) a specific operation can also be interpreted as meaning that the terminal operates upon expecting / assuming (or expecting / assuming that the base station does not perform) the specific operation. In addition, the division and index of each section, embodiment, example, option, method, plan, etc. in the following description are for the convenience of explanation and should not be interpreted as meaning that each constitutes an independent invention or that each must be implemented only individually. In addition, in describing each section, embodiment, example, option, method, plan, etc., if there is no explicitly conflicting / opposing description, it can be inferred / interpreted that at least some of them can be combined and implemented together, or at least some can be implemented with the omission of each.

[0039] In a wireless communication system, a terminal receives information from a base station via the downlink (DL) and transmits it to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type and purpose of the information being transmitted and received.

[0040] Figure 1 is a drawing for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.

[0041] When a terminal is powered on again from a powered-off state or enters a new cell, it performs an initial cell search operation, such as synchronizing with the base station, in step S101. To this end, the terminal receives a Synchronization Signal Block (SSB) from the base station. The SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). Based on the PSS / SSS, the terminal synchronizes with the base station and obtains information such as a cell ID (cell identity). In addition, the terminal can obtain broadcast information within the cell based on the PBCH. Meanwhile, the terminal can check the downlink channel status by receiving a Downlink Reference Signal (DL RS) during the initial cell search phase.

[0042] After completing the initial cell search, the terminal can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on the physical downlink control channel information in step S102.

[0043] Thereafter, the terminal may perform a random access procedure such as steps S103 to S106 to complete connection to the base station. To this end, the terminal may transmit a preamble through a physical random access channel (PRACH) (S103) and receive a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel (S104). In the case of contention-based random access, a contention resolution procedure such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) may be performed.

[0044] The terminal that has performed the procedure as described above can then perform the general uplink / downlink signal transmission procedure, such as receiving a physical downlink control channel / physical downlink shared channel (S107) and transmitting a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108). The control information that the terminal transmits to the base station is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and request Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted through PUCCH, but can be transmitted through PUSCH when control information and traffic data must be transmitted simultaneously. Additionally, UCI can be transmitted aperiodically via PUSCH upon request / instruction from the network.

[0045] Meanwhile, the random access procedure (RACH procedure) is not limited to initial network access (e.g., S103 to S106) and can be used for various purposes. For example, the random access procedure can be used for at least one of, but not limited to, an RRC Connection Re-establishment procedure, handover, UE-triggered UL data transmission, transition from RRC_INACTIVE, SCell time alignment, system information request and beam failure recovery, and UL resource request. The terminal can acquire UL synchronization and / or UL transmission resources through the random access procedure.

[0046] Figure 2 illustrates the structure of a radio frame. In NR, uplink and downlink transmissions are organized into frames. Each radio frame is 10 ms long and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1 ms sub-frames (SF). A sub-frame is divided into one or more slots, and the number of slots within a sub-frame depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols, depending on the cyclic prefix (CP). When a normal CP is used, each slot contains 14 OFDM symbols. When an extended CP is used, each slot contains 12 OFDM symbols.

[0047] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0048] SCS (15*2^u)Nslot symb N frame,u slot N subframe,u slot 15KHz (u=0)1410130KHz (u=1)1420260KHz (u=2)14404120KHz (u=3)14808240KHz (u=4)1416016

[0049] * N slot symb : Number of symbols in the slot

[0050] * N frame,u slot : Number of slots in the frame

[0051] * N subframe,u slot : Number of slots in a subframe

[0052] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0053] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0054] The structure of the frame is only an example, and the number of subframes, number of slots, and number of symbols in the frame can be varied.

[0055] In an NR system, OFDM numerology (e.g., SCS) may be set differently between multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbol).

[0056] Figure 3 illustrates a resource grid of a slot. A slot contains multiple symbols in the time domain. For example, in the case of a regular CP, one slot contains 14 symbols, but in the case of an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive Physical RBs (PRBs) in the frequency domain and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0057] Figure 4 illustrates an example of how physical channels are mapped within a slot. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. A PUCCH can be transmitted in the UL control region, and a PUSCH can be transmitted in the UL data region. GP provides a time gap between the base station and the terminal when switching from transmission mode to reception mode or from reception mode to transmission mode. Some symbols within a subframe at the time of transition from DL to UL can be set as GP.

[0058] Below, each physical channel is described in more detail.

[0059] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the downlink shared channel (DL-SCH), resource allocation information for the uplink shared channel (UL-SCH), paging information for the paging channel (PCH), system information on the DL-SCH, resource allocation information for upper layer control messages such as random access responses transmitted on the PDSCH, transmission power control commands, activation / deactivation of Configured Scheduling (CS), etc. The DCI includes a cyclic redundancy check (CRC), which is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or usage of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked with a terminal identifier (e.g., Cell-RNTI, C-RNTI). If the PDCCH is for paging, the CRC is masked with the Paging-RNTI (P-RNTI). If the PDCCH is for system information (e.g., a System Information Block, SIB), the CRC is masked with the System Information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with the Random Access-RNTI (RA-RNTI).

[0060] The PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs) depending on the Aggregation Level (AL). A CCE is a logical allocation unit used to provide a PDCCH with a predetermined code rate depending on the radio channel status. A CCE consists of six Resource Element Groups (REGs). A REG is defined as one OFDM symbol and one (P)RB. The PDCCH is transmitted through a Control Resource Set (CORESET). A CORESET is defined as a set of REGs with a given numerology (e.g., SCS, CP length, etc.). Multiple CORESETs for a single UE can overlap in the time / frequency domain. A CORESET can be configured through system information (e.g., Master Information Block, MIB) or UE-specific upper layer (e.g., Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of OFDM symbols (up to 3) that constitute the CORESET can be set by upper layer signaling.

[0061] To receive / detect PDCCH, the UE monitors PDCCH candidates. PDCCH candidates represent the CCE(s) that the UE should monitor for PDCCH detection. Each PDCCH candidate is defined as 1, 2, 4, 8, or 16 CCEs depending on the AL. Monitoring involves (blind) decoding the PDCCH candidates. The set of PDCCH candidates that the UE monitors is defined as a PDCCH Search Space (SS). The search space includes a Common Search Space (CSS) or a UE-specific search space (USS). The UE can acquire DCI by monitoring PDCCH candidates in one or more search spaces configured by the MIB or higher-layer signaling. Each CORESET is associated with one or more search spaces, and each search space is associated with one COREST. The search space can be defined based on the following parameters.

[0062] - controlResourceSetId: Indicates the CORESET associated with the search space.

[0063] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring period (in slots) and the PDCCH monitoring interval offset (in slots).

[0064] - monitoringSymbolsWithinSlot: Indicates the PDCCH monitoring symbols within the slot (e.g., the first symbol(s) of the CORESET).

[0065] - nrofCandidates: AL={1, 2, 4, 8, 16} indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8)

[0066] * An opportunity (e.g., time / frequency resource) for monitoring PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities can be configured within a slot.

[0067] Table 3 illustrates the characteristics of each search space type.

[0068] TypeSearch SpaceRNTIUse CaseType0-PDCCHCommonSI-RNTI on a primary cellSIB DecodingType0A-PDCCHCommonSI-RNTI on a primary cellSIB DecodingType1-PDCCHCommonRA-RNTI or TC-RNTI on a primary cellMsg2, Msg4 decoding in RACHType2-PDCCHCommonP-RNTI on a primary cellPaging DecodingType3-PDCCHCommonINT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI, or CS-RNTI(s)UE SpecificUE SpecificC-RNTI, or MCS-C-RNTI, or CS-RNTI(s)User specific PDSCH decoding

[0069] Table 4 illustrates DCI formats transmitted via PDCCH.

[0070] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of one or multiple PUSCH in one cell, or indicating downlink feedback information for configured grant PUSCH (CG-DFI)0_2Scheduling of PUSCH in one cell1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell, and / or triggering one shot HARQ-ACK codebook feedback1_2Scheduling of PDSCH in one cell2_0Notifying a group of UEs of the slot format, available RB sets, COT duration and search space set group switching2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0071] DCI format 0_0 is used to schedule a TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule a TB-based (or TB-level) PUSCH or a CBG (Code Block Group)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule a TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule a TB-based (or TB-level) PDSCH or a CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 may be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 may be referred to as DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to convey dynamic slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to convey downlink pre-emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 can be conveyed to the terminals within a group through the group common PDCCH, which is a PDCCH conveyed to the terminals defined as a group.

[0072] DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCI formats, while DCI format 0_1 ​​and DCI format 1_1 may be referred to as non-fallback DCI formats. In the fallback DCI format, the DCI size / field configuration remains the same regardless of the terminal configuration. On the other hand, in the non-fallback DCI format, the DCI size / field configuration varies depending on the terminal configuration.

[0073] PDSCH carries downlink data (e.g., DL-SCH transport block, DL-SCH TB) and applies modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM. TB is encoded to generate a codeword. PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to resources along with a Demodulation Reference Signal (DMRS), generated as an OFDM symbol signal, and transmitted through the corresponding antenna port.

[0074] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0075] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0076] - HARQ(Hybrid Automatic Repeat reQuest)-ACK(Acknowledgement): This is a response to a downlink data packet (e.g., codeword) on the PDSCH. It indicates whether the downlink data packet was successfully received. One HARQ-ACK bit can be transmitted in response to a single codeword, and two HARQ-ACK bits can be transmitted in response to two codewords. The HARQ-ACK response includes a positive ACK (simply, ACK), a negative ACK (NACK), a DTX, or a NACK / DTX. Here, HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0077] - CSI (Channel State Information): Feedback information for the downlink channel. MIMO (Multiple Input Multiple Output)-related feedback information includes the Rank Indicator (RI) and Precoding Matrix Indicator (PMI).

[0078] Table 5 illustrates PUCCH formats. Depending on the PUCCH transmission length, they can be classified into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4).

[0079] PUCCH formatLength in OFDM symbolsN PUCCH symb Number of bitsUsageEtc01 - 2≤2HARQ, SRSequence selection14 - 14≤2HARQ, [SR]Sequence modulation21 - 2>2HARQ, CSI, [SR]CP-OFDM34 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(no UE multiplexing)44 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(Pre DFT OCC)

[0080] PUCCH format 0 carries UCI of up to 2 bits in size and is mapped and transmitted based on sequence. Specifically, the terminal transmits a specific UCI to the base station by transmitting one of multiple sequences through the PUCCH of PUCCH format 0. The terminal transmits the PUCCH of PUCCH format 0 within the PUCCH resources for the corresponding SR configuration only when transmitting a positive SR.

[0081] PUCCH format 1 carries UCI of up to 2 bits in size, and modulation symbols are spread in the time domain using an orthogonal cover code (OCC) (which is set differently depending on whether frequency hopping is used). DMRS are transmitted in symbols where modulation symbols are not transmitted (i.e., transmitted using Time Division Multiplexing (TDM).

[0082] PUCCH format 2 carries UCI with a bit size greater than 2 bits, and modulation symbols are transmitted by frequency division multiplexing (FDM) with DMRS. DM-RSs are located at symbol indices #1, #4, #7, and #10 within a given resource block with a density of 1 / 3. Pseudo Noise (PN) sequences are used for DM_RS sequences. Frequency hopping can be enabled for 2-symbol PUCCH format 2.

[0083] PUCCH format 3 does not multiplex terminals within the same physical resource blocks and carries UCI with a bit size greater than 2 bits. In other words, PUCCH resources in PUCCH format 3 do not include orthogonal cover codes. Modulation symbols are transmitted through time division multiplexing (TDM) with DMRS.

[0084] PUCCH format 4 supports multiplexing of up to four terminals within the same physical resource blocks and carries UCI with a bit size greater than 2 bits. In other words, PUCCH resources in PUCCH format 3 include orthogonal cover codes. Modulation symbols are transmitted through time division multiplexing (TDM) with DMRS.

[0085] PUSCH carries uplink data (e.g., UL-SCH transport block, 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 a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmissions can be dynamically scheduled by UL grants in DCI, or semi-statically scheduled (configured grant) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmissions can be performed in a codebook-based or non-codebook-based manner.

[0086] Figure 5 illustrates the PDCCH / PDSCH reception and ACK / NACK transmission process. Referring to Figure 5, a terminal can detect a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI formats 1_0, 1_1), and the PDCCH indicates a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1). For example, DCI formats 1_0, 1_1 can include the following information:

[0087] - Frequency domain resource assignment: Indicates the set of RBs allocated to the PDSCH.

[0088] - Time domain resource assignment: K0 (e.g., slot offset), indicates the starting position of the PDSCH within slot #n+K0 (e.g., OFDM symbol index), and the length of the PDSCH (e.g., number of OFDM symbols).

[0089] - PDSCH-to-HARQ_feedback timing indicator: Indicates K1

[0090] - HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB)

[0091] Afterwards, the terminal receives PDSCH from slot #(n+K0) according to the scheduling information of slot #n, and when reception of PDSCH is finished in slot #n1 (where, n+K0≤n1), UCI can be transmitted through PUCCH in slot #(n1+K1). Here, UCI may include HARQ-ACK response for PDSCH. In Fig. 5, for convenience, it is assumed that SCS for PDSCH and SCS for PUCCH are the same and slot # n1 = slot #n+K0, but the present invention is not limited thereto. If the SCSs are different, K1 can be indicated / interpreted based on the SCS of PUCCH.

[0092] When the PDSCH is configured to transmit at most 1 TB, the HARQ-ACK response may consist of 1 bit. When the PDSCH is configured to transmit at most 2 TB, the HARQ-ACK response may consist of 2 bits if spatial bundling is not configured, and may consist of 1 bit if spatial bundling is configured. When the HARQ-ACK transmission timing for multiple PDSCHs is designated as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for multiple PDSCHs.

[0093] Whether a UE should perform spatial bundling for a HARQ-ACK response can be configured (e.g., via RRC / higher layer signaling) for each cell group. For example, spatial bundling can be individually configured for each HARQ-ACK response transmitted over the PUCCH and / or each HARQ-ACK response transmitted over the PUSCH.

[0094] Spatial bundling can be supported when the maximum number of TBs (or codewords) that can be received at a time (or scheduled via 1 DCI) in the serving cell is 2 (or more than 2) (e.g., when the upper layer parameter maxNrofCodeWordsScheduledByDCI corresponds to 2-TB). Meanwhile, more than 4 layers can be used for 2-TB transmission, and up to 4 layers can be used for 1-TB transmission. Consequently, when spatial bundling is configured for the cell group, spatial bundling can be performed for serving cells that can schedule more than 4 layers among the serving cells in the cell group. On the serving cell, a terminal that wishes to transmit a HARQ-ACK response via spatial bundling can generate the HARQ-ACK response by performing a (bit-wise) logical AND operation on the A / N bits for multiple TBs.

[0095] For example, assuming that a terminal receives a DCI scheduling 2 TB and receives 2 TB via PDSCH based on the DCI, the terminal performing spatial bundling can generate a single A / N bit by logically ANDing the first A / N bit for the first TB and the second A / N bit for the second TB. Consequently, if both the first TB and the second TB are ACK, the terminal reports the ACK bit value to the base station, and if either TB is NACK, the terminal reports the NACK bit value to the base station.

[0096] For example, if only 1-TB is actually scheduled on a serving cell configured to receive 2-TB, the terminal can generate a single A / N bit by logically ANDing the A / N bit for the 1-TB with bit value 1. Consequently, the terminal reports the A / N bit for the 1-TB to the base station as is.

[0097] A base station / terminal has multiple parallel DL HARQ processes for DL ​​transmission. These multiple parallel HARQ processes allow DL transmissions to be performed continuously while waiting for HARQ feedback regarding the success or failure of the previous DL transmission. Each HARQ process is associated with a HARQ buffer in the MAC (Medium Access Control) layer. Each DL HARQ process manages state variables such as the number of transmissions of MAC Physical Data Blocks (PDUs) in the buffer, HARQ feedback for MAC PDUs in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0098] Meanwhile, HARQ-ACK codebooks are broadly defined as Type-1, Type-2, and Type-3 depending on the HARQ-ACK bit (payload) configuration method. For Type-1 codebooks, the HARQ-ACK payload is configured based on a combination of a candidate HARQ-ACK timing (K1) set and a candidate PDSCH occasion (SLIV) set (configured for each cell) (e.g., a codebook with a semi-statically fixed size based on RRC signaling). For Type-2 codebooks, the codebook size can be dynamically changed depending on the number of PDSCHs actually scheduled or the number of corresponding resource allocations (e.g., downlink assignment index, DAI). For Type-3 codebooks, the HARQ-ACK payload is configured by mapping the HARQ-ACK bits corresponding to each HARQ process number (HPN) according to the maximum number of HARQ processes (configured for each cell) (e.g., one-shot A / N reporting). Recently, the NR standard has added the Enhanced Type-3 codebook as a form of Type-3 codebook. The Enhanced Type-3 codebook is a method to report HARQ-ACK bits for a subset of cells indicated to the base station among all cells at once, rather than a method to report HARQ-ACK bits for all cells at once in order to reduce signaling overhead. Subsets of cells related to the Enhanced Type-3 codebook are set to the terminal through upper layer signaling of the Enhanced Type-3 codebook indexes, and one of the subsets (e.g., Enhanced Type-3 codebook index) set to the terminal can be indicated through DCI that triggers the Enhanced Type-3 codebook.The terminal can report HARQ-ACK for cells belonging to the indicated subset. Meanwhile, depending on the setting of the Enhanced Type-3 codebook indices, the Enhanced Type-3 codebook can be configured not only at the per-cell level but also at the per-HARQ process level. For example, the Enhanced Type-3 codebook index can be set on a per-HARQ process basis to support reporting the Type-3 codebook for some of the HARQ processes of the corresponding cell.

[0099] Specifically, in the case of a Type-1 codebook, a set of multiple (e.g., N) candidate K1 values ​​is set (for each Cell, for each Cell), and for each K1 value, a combination of all SLIVs that can be transmitted (or scheduled to be transmitted) in a DL slot preceding K1 slots from an A / N transmission slot is calculated, and an A / N sub-payload corresponding to the DL slot (including determining the A / N bit position / order corresponding to each SLIV that can be transmitted in the slot) is constructed (this is defined as "SLIV Pruning"), and these A / N sub-payloads are concatenated for N K1 values ​​to construct the entire A / N codebook. At this time, a set of (N) DL slots corresponding to each K1 value can be defined as a bundling window corresponding to the A / N transmission slot.

[0100] For Type-2 HARQ-ACK codebooks, a codebook for transmitting HARQ-ACK information on the same PUCCH / PUSCH is defined based on the counter DAI (downlink assignment indicator) (C-DAI) and total DAI (T-DAI) values ​​indicated in the actually transmitted PDCCH. In other words, the codebook is configured based on the PDCCH information actually transmitted to the terminal. If the terminal fails to detect a specific PDCCH, it transmits a NACK to the bit for the corresponding PDCCH among the bits defined in the codebook. At this time, the terminal can recognize whether PDCCH detection failed or not through the C-DAI and T-DAI values. C-DAI counts the accumulated number of {serving cell index, PDCCH monitoring occasion}-pairs for which PDSCH receptions are provided up to the current serving cell and the current PDCCH monitoring occasion. First, for multiple PDSCH receptions for the same {serving cell index, PDCCH monitoring occasion}-pair, the PDSCH that starts receiving first is counted first (a lower C-DAI value is assigned). Next, if there are multiple pairs with the same PDCCH monitoring occasion index among different {serving cell index, PDCCH monitoring occasion}-pairs, the pair with the lower serving cell index is counted first. Next, if there are multiple pairs with the same serving cell index among different {serving cell index, PDCCH monitoring occasion}-pairs, the PDCCH monitoring occasion with the lower index is counted first.

[0101] For Type-3 codebook, specifically, one of the modes, Mode 1, which feeds back HARQ-ACK and corresponding NDI together, and Mode 2, which feeds back only HARQ-ACK without NDI, can be set from the BS to the UE. When set to Mode 1, the UE operates to feed back HARQ-ACK and corresponding NDI (indicated via DCI) for PDSCH reception of each HARQ Process Number (HPN) for each HPN. On the other hand, when set to Mode 2, the UE feeds back only HARQ-ACK for PDSCH reception of each HPN for each HPN.

[0102] Figure 6 illustrates a PUSCH transmission process. Referring to Figure 6, a terminal can detect a PDCCH in slot #n. Here, the PDCCH includes uplink scheduling information (e.g., DCI formats 0_0 and 0_1). DCI formats 0_0 and 0_1 can include the following information.

[0103] - Frequency domain resource assignment: Indicates the set of RBs allocated to PUSCH.

[0104] - Time domain resource assignment: Slot offset K2 indicates the starting position (e.g., symbol index) and length (e.g., number of OFDM symbols) of the PUSCH within the slot. The starting symbol and length can be indicated through SLIV (Start and Length Indicator Value) or can be indicated separately.

[0105] Thereafter, the terminal can transmit a PUSCH in slot #(n+K2) according to the scheduling information of slot #n. Here, the PUSCH includes a UL-SCH TB.

[0106] carrier aggreation

[0107] NR can support wider uplink / downlink bandwidth by merging multiple uplink / downlink carriers (i.e., carrier aggregation). Carrier aggregation enables the transmission / reception of signals on multiple carriers. When carrier aggregation is applied, each carrier (see Figure A2) can be referred to as a component carrier (CC). CCs can be adjacent or non-adjacent in the frequency domain. The bandwidth of each CC can be determined independently. Asymmetric carrier aggregation, where the number of UL CCs and DL CCs differs, is also possible.

[0108] - PCell (Primary Cell): For a terminal configured for carrier aggregation, this refers to the cell operating on the primary frequency (e.g., Primary Component Carrier, PCC) where the terminal performs the initial connection establishment procedure or initiates the connection re-establishment procedure. For DC (Dual Connectivity), this refers to the MCG (Master Cell Group) cell operating on the primary frequency where the terminal performs the initial connection establishment procedure or initiates the connection re-establishment procedure.

[0109] - SCell (Secondary Cell): For terminals with carrier aggregation configured, a cell that provides additional wireless resources in addition to the special cell.

[0110] - PSCell (Primary SCG Cell): In the case of DC, an SCG (Secondary Cell Group) cell to which a terminal performs random access when performing RRC reconfiguration and synchronization processes.

[0111] - Special Cell (SpCell): In case of DC, the special cell represents the PCell of the MCG or the PSCell of the SCG. Otherwise (i.e., non-DC), the special cell represents the PCell.

[0112] - Serving Cell (ServCell): Indicates a cell configured for a UE in the RRC_CONNECTED state. If CA / DA is not configured, there is only one serving cell (i.e., PCell). If CA / DA is configured, the serving cell represents a set of cells including special cell(s) and all SCells.

[0113] Meanwhile, control information may be configured to be transmitted and received only through specific cells. For example, UCI may be transmitted through a special cell (e.g., PCell). If a SCell (hereinafter, PUCCH-SCell) that allows PUCCH transmission is configured, UCI may also be transmitted through the PUCCH-SCell. As another example, the base station may allocate scheduling cells (sets) to reduce the complexity of PDCCH BD (blind decoding) at the terminal side. For PDSCH reception / PUSCH transmission, the terminal may perform PDCCH detection / decoding only in the scheduling cells. Furthermore, the base station may transmit the PDCCH only through the scheduling cells (sets). For example, a PDCCH for downlink allocation may be transmitted in cell #0 (i.e., the scheduling cell), and the corresponding PDSCH may be transmitted in cell #2 (i.e., the scheduled cell) (Cross-Carrier Scheduling, CCS). Scheduling cells (sets) can be configured in a terminal-specific, terminal-group-specific, or cell-specific manner. Scheduling cells include special cells (e.g., PCells).

[0114] For Cross-Carrier Scheduling, the carrier indicator field (CIF) is used. The CIF can be semi-statically disabled / enabled by UE-specific (or UE group-specific) higher layer (e.g., Radio Resource Control, RRC) signaling. The CIF field is an x-bit field (e.g., x=3) within the PDCCH (i.e., DCI) and can be used to indicate the (serving) cell index of the scheduled cell.

[0115] - CIF disabled: CIF is absent in the PDCCH. The PDCCH on the scheduling cell allocates PDSCH / PUSCH resources on the same cell. In other words, the scheduling cell is identical to the scheduled cell.

[0116] - CIF enabled: CIF exists within the PDCCH. The PDCCH in scheduling can allocate PDSCH / PUSCH resources on one of multiple cells using CIF. The scheduling cell can be the same as or different from the scheduled cell. PDSCH / PUSCH means PDSCH or PUSCH.

[0117] Figure 7 is a diagram illustrating carrier aggregation. In Figure 7, it is assumed that three cells are aggregation. If CIF is disabled, each cell can only transmit the PDCCH that schedules its own PDSCH / PUSCH (self-carrier scheduling, SCS). On the other hand, if CIF is enabled by terminal-specific (or terminal-group-specific or cell-specific) upper layer signaling and cell A is configured as a scheduling cell, cell A can transmit not only the PDCCH that schedules cell A's PDSCH / PUSCH but also the PDCCH that schedules the PDSCH / PUSCH of another cell (i.e., the scheduled cell) (cross-carrier scheduling, CCS). In this case, cells B / C do not transmit the PDCCH that schedules their own cells.

[0118] NR-shared spectrum / unlicensed band (NR-U) operation

[0119] Figure 8 illustrates a wireless communication system supporting an unlicensed band. For convenience, a cell operating in a licensed band (hereinafter, L-band) is defined as an LCell, and the carrier of the LCell is defined as a (DL / UL) LCC (Licensed Component Carrier). Furthermore, a cell operating in an unlicensed band (hereinafter, U-band) is defined as a UCell, and the carrier of the UCell is defined as a (DL / UL) UCC (Unlicensed Component Carrier). The carrier of a cell may refer to the operating frequency (e.g., center frequency) of the cell. Cells / carriers (e.g., component carriers, CC) may be collectively referred to as cells.

[0120] When carrier aggregation (CA) is supported, a single terminal can transmit and receive signals with a base station through multiple aggregated cells / carriers. When multiple CCs are configured for a single terminal, one CC can be configured as a PCC (Primary CC) and the remaining CCs can be configured as SCCs (Secondary CCs). Specific control information / channels (e.g., CSS PDCCH, PUCCH) can be configured to be transmitted and received only through the PCC. Data can be transmitted and received through the PCC / SCC. Figure 8(a) illustrates a case where a terminal and a base station transmit and receive signals through an LCC and a UCC (non-standalone (NSA) mode). In this case, the LCC can be configured as a PCC and the UCC can be configured as an SCC. When multiple LCCs are configured for a terminal, one specific LCC can be configured as a PCC and the remaining LCCs can be configured as SCCs. Figure 8(a) corresponds to LAA of a 3GPP LTE system. Figure 8(b) illustrates a case where a terminal and a base station transmit and receive signals via one or more UCCs without an LCC (SA (standalone) mode). In this case, one of the UCCs can be configured as a PCC, and the remaining UCCs can be configured as SCCs. Accordingly, the NR UCell can support PUCCH, PUSCH, and PRACH transmissions. Both NSA and SA modes can be supported in the unlicensed bands of the 3GPP NR system.

[0121] Unless otherwise stated, the definitions below apply to terms used in this specification.

[0122] - Channel: Consists of consecutive RBs on which a channel access process is performed in a shared spectrum, and may refer to a carrier or a portion of a carrier.

[0123] - Channel Access Procedure (CAP): This refers to the procedure for evaluating channel availability based on sensing to determine whether other communication node(s) are using the channel before signal transmission. The basic unit for sensing is a sensing slot with a duration of Tsl=9us. If the base station or terminal senses the channel during the sensing slot period, and the detected power for at least 4us within the sensing slot period is less than the energy detection threshold XThresh, the sensing slot period Tsl is considered to be idle. Otherwise, the sensing slot period Tsl=9us is considered to be busy. CAP may be referred to as LBT (Listen-Before-Talk).

[0124] - Channel occupancy: refers to the corresponding transmission(s) on the channel(s) by the base station / terminal after performing the channel access procedure.

[0125] - Channel Occupancy Time (COT): This refers to the total time that the base station / terminal and any base station / terminal(s) sharing the channel occupancy can perform transmission(s) 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 can be shared for transmission between the base station and the corresponding terminal(s).

[0126] - DL Transmission Burst: Defined as a set of transmissions from a base station without gaps exceeding 16us. Transmissions from a base station separated by gaps exceeding 16us are considered separate DL transmission bursts. A base station may perform transmission(s) after a gap without sensing channel availability within a DL transmission burst.

[0127] - UL Transmission Burst: Defined as a set of transmissions from a terminal without a gap exceeding 16us. Transmissions from a terminal separated by a gap exceeding 16us are considered separate UL transmission bursts. A terminal may perform transmission(s) after a gap without sensing channel availability within a UL transmission burst.

[0128] - Discovery burst: refers to a DL transmission burst that includes a set of signal(s) and / or channel(s) that is limited within a (time) window and associated with a duty cycle. In an LTE-based system, a discovery burst is a transmission(s) initiated by a base station, including PSS, SSS and CRS (cell-specific RS), and may further include a non-zero power CSI-RS. In an NR-based system, a discovery burst is a transmission(s) initiated by a base station, including at least an SS / PBCH block, and may further include a CORESET for a PDCCH scheduling a PDSCH having SIB1, a PDSCH carrying SIB1, and / or a non-zero power CSI-RS.

[0129] Figure 9 illustrates a method for occupying resources in an unlicensed band. Regional regulations for unlicensed bands require communication nodes within the unlicensed band to determine whether other communication nodes are using the channel before transmitting a signal. Specifically, communication nodes can first perform carrier sensing (CS) before transmitting a signal to determine whether other communication nodes are transmitting a signal. If it is determined that other communication nodes are not transmitting a signal, a clear channel assessment (CCA) is confirmed. If there is a CCA threshold set by predefined or higher-layer (e.g., RRC) signaling, the communication node can determine the channel status as busy if energy higher than the CCA threshold is detected in the channel, and as idle otherwise. For reference, 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. If the channel status is determined to be idle, the communication node can initiate signal transmission on the UCell. The above-described series of procedures may be referred to as Listen-Before-Talk (LBT) or Channel Access Procedure (CAP). LBT and CAP may be used interchangeably.

[0130] Table 6 illustrates the channel access procedures (CAPs) supported in NR-U.

[0131] TypeExplanationDLType 1 CAPCAP with random back-off- time duration spanned by the sensing slots that are sensed to be idle before a downlink transmission(s) is randomType 2 CAP- Type 2A, 2B, 2CCAP without random back-off- time duration spanned by sensing slots that are sensed to be idle before a downlink transmission(s) is deterministicULType 1 CAPCAP with random back-off- time duration spanned by the sensing slots that are sensed to be idle before a downlink transmission(s) is randomType 2 CAP- Type 2A, 2B, 2CCAP without random back-off- time duration spanned by sensing slots that are sensed to be idle before a downlink transmission(s) is deterministic

[0132] Multi-cell Scheduling DCI의 구성 및 이를 위한 상위 계층 설정 정보

[0133] NR supports a wide spectrum across various frequency ranges. The availability of 5G Advanced spectrum is expected to increase through the re-farming of frequency bands used in previous generations. In particular, available spectrum blocks in the lower frequency bands (FR1) tend to be more segmented and distributed. In the FR2 band and some FR1 bands, available spectrum may be wider, necessitating multi-carrier / cell operation within the band. There is a need to improve throughput and coverage by utilizing these distributed spectrum bands or wider bandwidth spectrum in a more power-efficient and flexible manner.

[0134] When scheduling data across multiple cells, including intra-band and inter-band cells, it is important to increase flexibility and spectrum / power efficiency. However, in the current 5G NR scheduling scheme, a DCI can only schedule PUSCH / PDSCH for a single cell. However, future spectrum expansion / changes are expected to increase the need for simultaneous scheduling of multiple cells. To reduce the control overhead associated with scheduling, it is advantageous to schedule PUSCH / PDSCH for multiple cells through a single DCI.

[0135] In order to reduce the DCI overhead required for PDSCH / PUSCH scheduling in a future carrier aggregation (CA) situation where multiple cells are configured, a multi-cell scheduling method that simultaneously schedules multiple (serving) cells / CCs (through which PDSCH / PUSCH transmission is performed) with a single DCI in Rel-18 may be considered.

[0136] Accordingly, we propose a method for configuring and interpreting each field in the DCI (multi-cell DCI) for designing a DCI structure that performs the above multi-cell scheduling. The part of this specification that mainly explains the multi-cell scheduling operation for PDSCH or PUSCH transmission can also be applied in the same way to multi-cell scheduling for PUSCH or PDSCH transmission. In addition, in this specification, a cell can mean an (active) BWP set / instructed for the corresponding cell.

[0137] Hereinafter, Multi-cell Scheduling DCI may be referred to as Multi-cell DCI or simply DCI, and may include at least one of DL grant DCI for scheduling PDSCH and UL grant DCI for scheduling PUSCH.

[0138] Hereinafter, a reference cell may be determined based on at least one of i) to viii) below, but is not limited thereto. Within a set of cells (i.e., co-scheduled cell sets) that are simultaneously scheduled through the same multi-cell DCI (or within each cell subgroup described below), i) a cell with a lowest (or highest) cell index; ii) a cell with an earliest (or latest) indicated PDSCH / PUSCH transmission starting symbol time (if there are multiple cells with earliest (or latest) PDSCH / PUSCH starting symbol times, the cell with the lowest (or highest) cell index among the multiple cells); iii) a cell with an earliest (or latest) indicated PDSCH / PUSCH transmission ending symbol time (if there are multiple cells with earliest (or latest) PDSCH / PUSCH ending symbol times, the cell with the lowest (or highest) cell index among the multiple cells); iv) a cell indicated by the CIF field value or a cell previously designated via RRC; or within any set of cells that can be scheduled via any multi-cell DCI (i.e., schedulable cell set), v) a cell with the lowest (or highest) cell index; vi) a cell indicated by the CIF field value; vii) a cell where the multi-cell DCI is transmitted; and / or viii) a cell previously designated via RRC.

[0139] - Shared-cell-common method: Only one field is configured within the multi-cell DCI, and the value indicated by the DCI field is commonly applied to all cells (scheduled through the multi-cell DCI).

[0140] - Shared-state-extension method: Only one field is configured within the multi-cell DCI, and each of the multiple states that can be indicated by the DCI field is configured / set as a combination of multiple pieces of information about multiple cells (not information about a single cell).

[0141] Meanwhile, the fields applied to the Shared-cell-common method and / or the Shared-state-extension method proposed in this specification may be in the form of: i) only one field configured within the multi-cell DCI (i.e., commonly applied to all cells belonging to the co-scheduled cell set), or ii) one field configured (commonly applied) for each cell subgroup while all cells belonging to the co-scheduled cell set are grouped (set) into one or more (plural) cell subgroups (i.e., individual / independent fields are configured between cell subgroups), or iii) one field configured (commonly applied) for each cell subgroup while all cells belonging to the schedulable cell set are grouped (set) into one or more (plural) cell subgroups (i.e., individual / independent fields are configured between cell subgroups) (i.e., for each cell subgroup, the Shared-cell-common / Shared-state-extension method and fields / information based thereon). (Configuration / instruction method may be applied). In the above, each cell subgroup may be configured / set up with a specific cell or a specific plurality of cells belonging to the co-scheduled cell set or schedulable cell set (e.g., some or all of the cells belonging to the co-scheduled cell set or schedulable cell set).

[0142] Meanwhile, in the case of the existing (single-cell DCI-based scheduling) DCI field to which the Shared-cell-common method proposed in this specification is applied, in the case where a table consisting of one or more (multiple) states / indexes (composed of different parameter / value (combinations)) for each cell is set in advance by RRC or MAC-CE, and one of the (multiple) states / indexes within the table is indicated through the DCI field (for example, in the case of the PRB bundling size indicator and / or Rate matching (RM) indicator and / or ZP CSI-RS trigger and / or SRS request below), a specific state / index indicated through a DCI field that is commonly configured for a cell set to which the Shared-cell-common method is applied (e.g., co-scheduled cell set or cell subgroup) is interpreted / applied (i.e., for each cell) as a parameter / value (combination) corresponding to the state / index within the table set for each cell belonging to the cell set, or Opt Y) a specific reference state / index within the cell set. The parameter / value (combination) corresponding to the state / index in the table set for the cell can be commonly applied to the cells belonging to the cell set, or (Opt Z) a separate (common) table to be commonly applied to the cell set can be set in advance with RRC / MAC-CE in the same manner as above, and the parameter / value (combination) corresponding to the state / index in the common table can be commonly applied to the cells belonging to the cell set.

[0143] Additionally, some cells may not have values ​​set for the corresponding state / codepoint. For example, for the i-th state / codepoint, Cell#2 may have value x, but Cell#1 and Cell#N may not have values ​​set. Information (e.g., table) containing the values ​​of cells to be applied for interpretation of the Shared-cell-common DCI field may be set for each cell in the terminal. For example, with respect to the Shared-cell-common DCI field, the first table may be set for Cell#1, the second table may be set for Cell#2, and so on. The Nth table may be set for Cell#N.

[0144] For example, a table for each cell set for single-cell (SC) scheduling can also be used for multi-cell (MC). For example, while an SC Table referenced by an SC DCI in a format for SC is set for each cell, an MC Table referenced by an MC DCI can correspond to a combination of the SC Tables of multiple cells.

[0145] [Type 1A field related: Invalid state handling]

[0146] First, a more specific example of the above Shared-cell-common method (specifically, the Opt X method) is presented as follows (hereinafter, the field formed based on this is referred to as a “Type 1A” field for convenience).

[0147] First, in the existing single-cell DCI-based scheduling, in the case of a specific DCI field (e.g., BWP indicator, Open-loop power control parameter set indication (i.e., OLPC indicator), ChannelAccess-CPext-CAPC (for PUSCH) (i.e., PUSCH LBT), Beta offset indicator, PDCCH monitoring adaptation indication, etc.), N (different) parameter / value (combinations) are set in advance by RRC or MAC-CE for each of N states / codepoints / indexes that can be indicated by the corresponding DCI field, and when one of the N states / codepoints / indexes is indicated through the corresponding DCI field, the terminal performs PDSCH / PUSCH transmission / reception operations by applying the parameter / value (combination) set for the indicated state / codepoint / index. In this case, the size of the DCI field can be determined as ceil {log2(N)} bits, where N can be set to a different (or the same) value for each cell.

[0148] For reference, in the invention, ceil (X) means the smallest integer greater than or equal to X, floor (X) means the largest integer less than or equal to X, and the value of the modulo-B operation on A means the remainder when A is divided by B.

[0149] Meanwhile, in multi-cell DCI-based scheduling, for the specific DCI field, when the parameter / value (combination) for each state / codepoint / index (applicable to single-cell DCI-based scheduling) is preset for each cell as above, if a specific state / codepoint / index is indicated through the DCI field, the terminal can perform transmission / reception operations for the PDSCH / PUSCH scheduled for each cell by interpreting / applying the parameter / value (combination) set for each cell for the indicated state / codepoint / index, respectively. For example, Fig. 10 illustrates a DCI field of the Opt X method of Shared-cell-common. In Fig. 10, for convenience of explanation, it is assumed that four cells are included in the co-scheduled cell set, and therefore the actual number of co-scheduled cells may be four or less. The value indicated by one state (codepoint) of the DCI field of Fig. 10 can be independently interpreted / set for each cell. For example, assuming that the first state / codepoint (e.g., 00) is indicated, the first state / codepoint may mean value a for Cell#1, value b for Cell#2, and value c for Cell#3. The meaning that values ​​are set independently for each cell includes, but is not limited to, the case where different values ​​are set for different cells, and does not exclude the case where the same value is set for two or more cells. That is, it is sufficient if values ​​between cells are set independently, and there may not be a constraint that the independently set values ​​must be the same or different.

[0150] Meanwhile, in multi-cell DCI-based scheduling, the size of the specific DCI field may be determined by ceil {log2(N_max)} bits based on Alt A) the maximum value N_max among the N values ​​set for each cell belonging to the cell set for the entire schedulable cell set (or each co-scheduled cell set) (in this case, it may be a structure in which up to (initial) N_max states / codepoints / indexes are indicated through the DCI field), or by ceil {log2(N_min)} bits based on Alt B) the minimum value N_min (in this case, it may be a structure in which up to (initial) N_min states / codepoints / indexes are indicated through the DCI field). For example, referring to FIG. 10, the number of states of Cell #1 is minimum (i.e., N_min), and the number of states of Cell #4 is maximum (i.e., N_max). According to Alt A), the size of the DCI field is ceil {log2(N_max)= 2 bits based on Cell #4. According to Alt B), the size of the DCI field is ceil {log2(N_min)=1 bit based on Cell #1.

[0151] Meanwhile, when applying the above Alt A method, some cells may not have values ​​set for the corresponding state / codepoint. For example, referring to Fig. 10, Cell#1 and Cell#2 do not have values ​​for the 3rd state (DCI field value = 2) in the corresponding table. To put this more generally, if a specific state / index (e.g., a state / index higher than the DCI field value = {N_low - 1}, i.e., the state / index following the N_low-th state / index) is indicated through a specific DCI field for a specific cell X (e.g., a cell where N is set to N_low values ​​less than N_max), then the parameter / value (combination) set for the corresponding state / index may not exist for the corresponding cell X, and considering this case, the following operation is proposed (for convenience, M = ceil {log2(N_max)} and K = ceil {log2(N_low)} (M≥K) and L floor {log2(N_low)} (M≥L) respectively).

[0152] 1) Alt 1: For the above cell X, only (selected) K bits among the M bits in the DCI field can be interpreted and applied. The K bits can be, for example, the first K (MSB) bits or the last K (LSB) bits. For example, referring to FIG. 10, for Cell #1 and Cell #2, only one bit (MSB or LSB) out of a total of two bits included in the DCI field can be selected and applied. If the binary value of the selected one bit (MSB or LSB) is 0, value a can be applied to Cell #1, and value b can be applied to Cell #2.

[0153] A. Meanwhile, if a state / index corresponding to a field value higher than {N_low - 1} is indicated through the above K bits, in which case the Alt 2 or Alt 3 or Alt 6 operation below can be applied. For example, referring to FIG. 10, in the case of Cell #1 and Cell #2, only 1 bit (MSB or LSB) out of a total of 2 bits included in the DCI field can be selected and applied. However, if the binary value of the selected 1 bit is 1, the value e can be applied to Cell #2, but there is a problem that there is no value to be applied in the Table of Cell #1. To solve this problem, Alt 3 or Alt 6 described below can be applied.

[0154] B. In another way, for a cell set to be schedulable from multi-cell DCI, the N value set for the DCI field configured based on the Shared-cell-common method (specifically the Opt X method) is 2. A (A is a positive integer) can be restricted to be set only in the form:

[0155] C. For example, in the case of the BWP indicator field, if N_max is 4 and N_low set for the cell X = 2 (e.g., see Cell#2 of FIG. 10), the terminal can operate in a state in which it considers that the BWP index set for the corresponding state is indicated by interpreting only the MSB 1-bit or the LSB 1-bit in the BWP indicator field (in the multi-cell DCI) for the cell X.

[0156] D. As another example, in the case of the OLPC indicator field, if N_max = 4 and N_low = 2 set for the cell X (e.g., see Cell#2 of FIG. 10), the terminal may operate in a state in which it considers that the power control parameter set index set to the corresponding state is indicated by interpreting only the MSB 1-bit or the LSB 1-bit in the OLPC indicator field (in the multi-cell DCI) for the cell X.

[0157] E. Another example, for the PUSCH LBT field, if N_max = 8 and N_low = 4 set for the cell X, the terminal may operate in a state in which it considers that the LBT-related parameter / value (combination) set in the corresponding state is indicated by interpreting only the MSB 2-bit or LSB 2-bit in the PUSCH LBT field (in the multi-cell DCI) for the cell X.

[0158] 2) Alt 2: If a state / index corresponding to a field value higher than {N_low - 1} is indicated through the DCI field, a specific parameter / value (combination) that is separately set / defined in advance may be applied to the cell X. For example, referring to FIG. 10, if a value higher than binary value 00 is indicated through the DCI field, Alt 2 is applied to Cell #1, if a value higher than binary value 01 is indicated through the DCI field (in addition to Cell #1), Alt 2 may be applied to Cell #2, and if a value higher than binary value 10 is indicated through the DCI field (in addition to Cell #1 and Cell #2), Alt 2 may be applied to Cell #3.

[0159] A. The above specific parameter / value (combination) can be set / defined as a parameter / value (combination) linked to a specific one (e.g. lowest or highest) value among the N_low states / indexes preset in the corresponding cell X.

[0160] B. For example, in the case of the BWP indicator field, if N_low = 2 set for the cell X and the state indicated by the BWP indicator field (in the multi-cell DCI) is a value higher than 1 (i.e., bit 01) (i.e., the state is bit 10 or 11 (not bit 00 or 01)), the terminal can operate in a state in which it is considered that the BWP index set to the lowest state 0 (or a specific state set separately) is indicated for the cell X.

[0161] C. For another example, in the case of the OPLC indicator field, if N_low = 2 set for the cell X and the state indicated by the OPLC indicator field (in the multi-cell DCI) is higher than 1 (i.e. bit 01), the terminal may operate in a state in which it is considered that the power control parameter set index set to the lowest state 0 (or a specific state set separately) is indicated for the cell X.

[0162] D. As another example, for the PUSCH LBT field, if N_low = 4 set for the cell X and the state indicated by the OPLC indicator field (in the multi-cell DCI) is higher than 3 (i.e. bit 011), the terminal may operate in a state in which it is considered that the LBT-related parameter / value (combination) set for the lowest state 0 (or a specific state set separately) is indicated for the cell X.

[0163] 3) Alt 3: If a state / index corresponding to a field value higher than {N_low - 1} is indicated through the DCI field, the terminal may consider that there is no PDSCH / PUSCH scheduling for the cell X.

[0164] - For example, assuming that Alt 3 is applied alone (without applying Alt 1), referring to Fig. 10, if a value higher than binary value 00 is indicated through the DCI field, Alt 3 is applied to Cell #1, and if a value higher than binary value 01 is indicated through the DCI field, Alt3 can also be applied to Cell #2 (in addition to Cell #1).

[0165] -Meanwhile, assuming that Alt 3 is applied in addition to Alt 1 as described above, first, in the case of Cell #1, only 1 bit (MSB or LSB) out of 2 bits included in the DCI field can be selected and applied according to Alt 1. If the binary value of the selected 1 bit is 1, there is no value to be applied in the Table of Cell #1, so Alt 3 can be applied to Cell #1.

[0166] - Meanwhile, if Alt 3 is applied (regardless of whether Alt 1 is applied), Alt3 can be applied to Cell#3 if a value higher than binary 10 is indicated through the DCI field.

[0167] A. By applying Alt 3, the terminal can omit PDSCH / PUSCH transmission / reception operations on the corresponding cell X (in the case of PDSCH, the corresponding HARQ-ACK is fed back as NACK).

[0168] B. For example, in the case of the BWP indicator (or OLPC indicator) field, if N_low = 2 set for the cell X and the state indicated by the BWP indicator (or OLPC indicator) field (in the multi-cell DCI) is a value higher than 1 (i.e., bit 01), the terminal can operate under the assumption that there is no PDSCH / PUSCH scheduling for the cell X.

[0169] 4) Alt 4: The terminal can additionally set and apply {N_max - N_low} = N_gap parameter / value (combinations) corresponding to each state / index from state / index N_low to N_max - 1 for the above cell X. For example, referring to FIG. 10, values ​​mapped to binary values ​​01, 10, and 11 may be additionally set for Cell #1, values ​​mapped to binary values ​​10 and 11 may be additionally set for Cell #2, and values ​​mapped to binary value 11 may be additionally set for Cell #3.

[0170] A. The above additional parameter / value (combination) can be set as a parameter / value (combination) linked to a specific N_gap state / index among the N_low states / indexes preset in the corresponding cell X.

[0171] B. For example, in the case of the BWP indicator field, if N_max = 4 and N_low set in the cell X = 2, a BWP index corresponding to each of the two states of state 2 and 3 can be additionally set and applied for the cell X.

[0172] C. For another example, in the case of the OLPC indicator field, if N_max = 4 and N_low = 2 set for the cell X, power control parameter set indices corresponding to each of the two states of state 2 and 3 can be additionally set and applied for the cell X.

[0173] D. As another example, for the PUSCH LBT field, if N_max = 8 and N_low = 4 set for the cell X, LBT-related parameter / value (combination) corresponding to each of the four states from state 4 to 7 can be additionally set and applied for the cell X.

[0174] 5) Alt 5: The terminal can interpret and apply the state / index corresponding to the value obtained by performing a modulo-N_low operation on the state / index indicated by the DCI field for the cell X. For example, referring to FIG. 10, a 'modulo-1 (DCI field value)' operation can be applied to Cell #1, a 'modulo-2 (DCI field value)' operation can be applied to Cell #2, and a 'modulo-3 (DCI field value)' operation can be applied to Cell #3.

[0175] A. For example, if N_low = 5 and N_max = 8, each state / index {0,1,2,3,4,5,6,7} indicated by the DCI field can be interpreted / applied as state / index {0,1,2,3,4,0,1,2} for the cell X, respectively.

[0176] B. For example, in the case of the BWP indicator field, if N_max = 4 and N_low set for the cell X = 2, the terminal can interpret each of the four states 0 / 1 / 2 / 3 indicated by the DCI field as state 0 / 1 / 0 / 1 for the corresponding cell X and operate in a state in which the corresponding BWP index is indicated.

[0177] C. As another example, in the case of the OLPC indicator field, if N_max = 4 and N_low set for the cell X = 2, the terminal can operate in a state in which it interprets each of the four states 0 / 1 / 2 / 3 indicated by the DCI field as state 0 / 1 / 0 / 1 for the corresponding cell X and considers that the corresponding power control parameter set index is indicated.

[0178] D. As another example, in the case of the PUSCH LBT field, if N_max = 8 and N_low = 4 set for the cell X, the terminal may interpret each of the eight states 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 indicated by the DCI field as states 0 / 1 / 2 / 3 / 0 / 1 / 2 / 3 for the corresponding cell X and operate in a state in which the corresponding LBT-related parameter / value (combination) is indicated.

[0179] 6) Alt 6: If a state / index corresponding to a field value higher than {N_low - 1} is indicated through the DCI field above, the most recently indicated state / index can be applied / maintained as is for the cell X.

[0180] - For example, assuming that Alt 6 is applied alone (without applying Alt 1), referring to Fig. 10, if a value higher than binary value 00 is indicated through the DCI field of the currently received first DCI, the indication by the second DCI (which is the last DCI that indicated a valid value, i.e., a field value less than or equal to {N_low - 1} for Cell #1) prior to the first DCI may be applied / maintained for Cell #1. If a value higher than binary value 01 is indicated through the DCI field, Alt 6 may also be applied for Cell #2 (in addition to Cell #1).

[0181] - Meanwhile, assuming that Alt 3 is applied in addition to Alt 1 as described above, first, in the case of Cell #1, only 1 bit (MSB or LSB) out of 2 bits included in the DCI field can be selected and applied according to Alt 1. If the binary value of the selected 1 bit is 1, there is no value to be applied in the Table of Cell #1, so the instruction by the 2nd DCI (which is the last DCI that indicated a field value less than or equal to {N_low - 1} for Cell #1) prior to the currently received 1st DCI can be applied / maintained.

[0182] - Meanwhile, when Alt 6 is applied (regardless of whether Alt 1 is applied), if a value higher than binary 10 is indicated through the DCI field, the indication by the second DCI (which is the last DCI that indicated a valid value, i.e., a field value less than or equal to {N_low - 1} for Cell #3) prior to the currently received first DCI may be applied / maintained for Cell #3.

[0183] A. Accordingly, the terminal can perform PDSCH / PUSCH transmission / reception operations on the cell X by applying / maintaining the state / index recently indicated to the cell X.

[0184] B. For example, in the case of the BWP indicator (or OLPC indicator) field, if N_low = 2 set for the cell X and the state indicated by the BWP indicator (or OLPC indicator) field (in the multi-cell DCI) is higher than 1 (i.e. bit 01), the terminal may operate to maintain / apply the most recently indicated current active BWP index (or the most recently indicated power control parameter set index) for the cell X.

[0185] 7) Alt 7: The terminal can interpret and apply only the first L (MSB) bits or the last L (LSB) bits among the M bits in the DCI field for the cell X.

[0186] A. In this case, for the cell X, the lowest (or highest) 2 among the N_low states / indexes (set in the single-cell (scheduling) DCI of the cell X) L Dog state / indexes (set to 2) L Only parameter / value combinations can be indicated through the DCI field.

[0187] B. For example, in the case of the BWP indicator field, if N_max = 4 and N_low = 3 set for the cell X, the terminal can operate in a state in which it considers that the BWP index set to one of the two lowest (or highest) states (among the three states corresponding to the N_low) is indicated by interpreting only the MSB 1-bit or the LSB 1-bit in the 2-bit BWP indicator field (in the multi-cell DCI) for the cell X.

[0188] C. As another example, in the case of the OLPC indicator field, if N_max = 4 and N_low = 3 set for the cell X, the terminal may interpret only the MSB 1-bit or the LSB 1-bit in the 2-bit OLPC indicator field (in the multi-cell DCI) for the cell X and operate in a state in which it is considered that the power control parameter set index set to one of the two lowest (or highest) states (out of the three states corresponding to the N_low) is indicated.

[0189] D. Another example, for the PUSCH LBT field, if N_max = 8 and N_low = 6 set for the cell X, the terminal may operate in a state in which it considers that the LBT-related parameter / value (combination) set to one of the lowest (or highest) four states (among the six states corresponding to the N_low) is indicated by interpreting only the MSB 2-bit or the LSB 2-bit in the 3-bit PUSCH LBT field (in the multi-cell DCI) for the cell X.

[0190] Meanwhile, when the Shared-cell-common method (based on the Opt X method) is applied to the BWP indicator field, one of the states that can be indicated by the BWP indicator field in the multi-cell DCI can be set to “no BWP index switching” or “maintain current active BWP”, and when the state is indicated, the terminal can operate to maintain the current active BWP without changing the BWP index on all cells scheduled through the DCI.

[0191] [How to configure / set up a (multi-cell) table for the shared-state-extension method]

[0192] Meanwhile, in the case of the Shared-state-extension method proposed in this specification, only one field (to be commonly applied to multiple co-scheduled cells) is configured in the multi-cell DCI for a specific DCI field (e.g., TDRA field, RM indicator, ZP CSI-RS trigger, TCI field, SRS request, SRS offset indicator, etc.), and each row in the table referenced by the field is a cell-specific (PDSCH / PUSCH transmission / reception-related) parameter / value (set) for multiple cells (belonging to the entire schedulable cell set) (for example, {K0 or K2, SLIV, PDSCH or PUSCH mapping type A / B} for the TDRA field, rate-matching pattern for the RM indicator, aperiodic ZP CSI-RS resource set index for the ZP CSI-RS trigger, TCI state, SRS In the case of a request, it may be a structure configured / set by a combination of an aperiodic SRS resource set index, a slot offset in the case of an SRS offset indicator, etc.), and accordingly, when a specific code-point (or state) is indicated through the above field, a combination of parameters / values ​​(sets) of multiple cells set in a row (index) in the (multi-cell) table corresponding to the code-point / state may be applied to PDSCH / PUSCH transmission / reception operations on co-scheduled cells.

[0193] The multi-cell table may be configured with a structure as shown in FIG. 11, for example, and may be a structure in which a combination of parameter / value (set) of multiple cells (belonging to the entire schedulable cell set) is set for each row (index) in the table (for example, in the case of row index 0 in the table of FIG. 11, the parameter / value (set) for each of cells 1 / 2 / 3 / 4 is set to A0 / B0 / C0 / D0), and wherein the value set for each cell in each row of the multi-cell table is set to a row index in the (single-cell) table set in the single-cell (scheduling) DCI for the corresponding cell (for example, in the case of the TDRA field, the TCI field, the ZP CSI-RS trigger, the SRS request, the SRS offset indicator, etc.), or a code-point (or) of the specific field in the single-cell DCI for the corresponding cell (for example, in the case of the TCI field, the RM indicator, the ZP CSI-RS trigger, the SRS request, the SRS offset indicator, etc.) state) (and thus, the parameter / value (set) set in the single-cell table row index or the code-point / state of the single-cell DCI field is set in the multi-cell table row) (for example,In the table of Fig. 11, A0 / B0 / C0 / D0 corresponding to each of cells 1 / 2 / 3 / 4 at row index 0 may mean that it is set to row index A0 / B0 / C0 / D0 in the single-cell table set to each of cells 1 / 2 / 3 / 4, or may mean that it is set to code-point / state A0 / B0 / C0 / D0 of the field in the single-cell DCI set to each of cells 1 / 2 / 3 / 4, and A0 / A1 / A2 corresponding to cell 1 at row index 0 / 1 / 2 may mean that it is set to row index A0 / A1 / A2 in the single-cell table set to each of cells 1, or may mean that it is set to code-point / state A0 / A1 / A2 of the field in the single-cell DCI set to each of cells 1).

[0194] For example, in the case of the RM indicator field, the structure indicates whether rateMatchPatternGroup1 and rateMatchPatternGroup2 are applied through the corresponding field in the single-cell DCI using a 2-bit bitmap, and the corresponding code-point (or state) 0 / 1 / 2 / 3 can be a value set for each cell in each row of the multi-cell table. As another example, in the case of the SRS request field, (for a cell in which the SUL carrier is set) one of the non-SUL carrier and the SUL carrier is indicated through the MSB 1-bit in the 3-bit field in the single-cell DCI, and the aperiodic SRS resource set index is indicated with the remaining 2-bits, or (for a cell in which the SUL carrier is not set) the aperiodic SRS resource set index is indicated with the 2-bit field in the single-cell DCI. The corresponding code-point (or state) 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 (for a cell in which the SUL carrier is set) or code-point (or state) 0 / 1 / 2 / 3 (for a cell in which the SUL carrier is not set) can be a value set for each cell in each row of the multi-cell table. Alternatively, multi-cell DCI can be restricted to allow / enable only SRS requests for non-SUL carriers (even for cells configured with SUL carriers) (in this case, code-point (or state) 0 / 1 / 2 / 3 corresponding to the aperiodic SRS resource set index indication with the remaining 2 bits excluding the MSB 1-bit can be the values ​​set for each cell in each row of the multi-cell table).Alternatively, multi-cell DCI may be used to restrict SRS requests to be allowed / possible only for the most recently indicated / configured / activated carrier among non-SUL carriers and SUL carriers (for cells where SUL carriers are configured) (in this case, code-point (or state) 0 / 1 / 2 / 3 corresponding to the aperiodic SRS resource set index indication with the remaining 2 bits excluding the MSB 1-bit may be a value set for each cell within each row of the multi-cell table).

[0195] Meanwhile, considering the operation of indicating BWP index for multiple cells through the BWP indicator field in the multi-cell DCI, the multi-cell table can be set in the following manner.

[0196] 1) Opt 1: Considering the indication operation of the BWP indicator field based on the Type 1A (and its associated Alt A / B and / or Alt 1 / 2 / 3 / 4 / 5 / 6 / 7 methods), the multi-cell table can be set for the combination of BWP indexes for each cell (belonging to the entire schedulable cell set) corresponding to each code-point (or state) of the BWP indicator field (or indicated by the code-point (or state)).

[0197] A. For example, referring to FIG. 12, it is assumed that the entire schedulable cell set is composed of cells 1 / 2 / 3 and (through the indication operation of the BWP indicator field based on the Type 1A (and / or Alt 1 / 2 / 3 / 4 / 5 / 6 / 7 method associated therewith)) for each of code-point (or state) 0 / 1 / 2 of the BWP indicator field, BWP index a0 / a1 / a2 corresponds to / indicates for cell 1, BWP index b0 / b1 / b2 corresponds to / indicates for cell 2, and BWP index c0 / c1 / c2 corresponds to / indicates for cell 3. According to the Opt 1 method, as shown in Fig. 12 (c), the second type (shared state extension) field code-points and corresponding values ​​are defined for the cell-specific BWP index combination {a0, b0, c0} corresponding to the code-point (or state) 0 of the BWP indicator field, which is a first type (e.g., Type 1A) field, and the second type (shared state extension) field code-points and corresponding values ​​are defined for the cell-specific BWP index combination {a1, b1, c1} corresponding to the code-point (or state) 1 of the BWP indicator field, which is a first type field, and the cell-specific BWP index combination {a2, b2, c2} corresponding to the code-point (or state) 2 of the BWP indicator field, which is a first type field, thereby setting the multi-cell table (e.g., Fig. 12 (c)).

[0198] B. Meanwhile, if a cell is set to operate with only a specific BWP (index) through RRC without a BWP index indication through DCI, the specific BWP (index) of the cell is included for each of all code-points (or states) of the BWP indicator field, and a combination of BWP indices for each cell corresponding to the code-point (or state) is determined and a multi-cell table can be set for this.

[0199] i. For example, if only one specific BWP index c0 is set in cell 3 in the above example, the multi-cell table can be set for each of the cell-specific BWP index combinations {a0, b0, c0} corresponding to code-point (or state) 0, the cell-specific BWP index combinations {a1, b1, c0} corresponding to code-point (or state) 1, and the cell-specific BWP index combinations {a2, b2, c0} corresponding to code-point (or state) 2.

[0200] C. In addition, if a cell is included that is set to operate by switching between multiple (e.g. N) BWP (indexes) based on a specific Timer without a BWP index instruction through DCI, for each of the code-points (or states) of the BWP indicator field, each of the N BWP (indexes) of the corresponding cell is included to determine N combinations of BWP indexes for each cell corresponding to the corresponding code-point (or state), and a multi-cell table can be set for this.

[0201] i. For example, in the above example, if two BWP indexes c0 / c1 that operate (switching) based on a specific Timer are set in cell 3, the multi-cell table can be set for each of the cell-specific BWP index combinations {a0, b0, c0} and {a0, b0, c1} corresponding to code-point (or state) 0, the cell-specific BWP index combinations {a1, b1, c0} and {a1, b1, c1} corresponding to code-point (or state) 1, and the cell-specific BWP index combinations {a2, b2, c0} and {a2, b2, c1} corresponding to code-point (or state) 2.

[0202] D. Meanwhile, if all cells belonging to the entire schedulable cell set are set to operate with only a specific BWP (index) through RRC without BWP index indication through DCI or to operate while switching between multiple BWP (index) based on a specific Timer, the multi-cell table may be set for each of all possible cell-specific BWP (index) combinations or the multi-cell table may be configured and applied based on the Opt 2 method below.

[0203] i. For example, if only one BWP index a0 is set in cell 1, only one BWP index b0 is set in cell 2, and only one BWP index c0 is set in cell 3, the multi-cell table can be set only for the BWP index combination {a0, b0, c0} per cell. As another example, if only one BWP index a0 is set in cell 1, only one BWP index b0 is set in cell 2, and two BWP indexes c0 / c1 that operate (switching) based on a specific Timer are set in cell 3, the multi-cell table can be set for each of the two BWP index combinations {a0, b0, c0} and {a0, b0, c1} per cell. As another example, if two BWP indexes a0 / a1 that operate (switching) based on a specific Timer are set in cell 1, two BWP indexes b0 / b1 that operate (switching) based on a specific Timer are set in cell 2, and two BWP indexes c0 / c1 that operate (switching) based on a specific Timer are set in cell 3, the multi-cell table can be set for each of the eight cell-specific BWP index combinations {a0, b0, c0}, {a0, b0, c1}, {a0, b1, c0}, {a0, b1, c1}, {a1, b0, c0}, {a1, b0, c1}, {a1, b1, c0}, {a1, b1, c1}.

[0204] 2) Opt 2: For each cell belonging to the entire schedulable cell set, a set (for all rows) of values ​​(e.g., row index in the single-cell table or code-point / state of a field in the single-cell DCI) corresponding to the corresponding cell in each row of the multi-cell table (for convenience, this is called a "per-cell sub-table"; for example, {A0, A1, A2} in 1 in the figure above can be a per-cell sub-table corresponding to cell 1) is set for each BWP index of the corresponding cell, and the multi-cell table can be configured and applied by concatenating multiple per-cell sub-tables according to the combination of (active) BWP indexes for each cell indicated through the multi-cell DCI.

[0205] A. For example, in a situation where the entire schedulable cell set is composed of cells 1 / 2, and the per-cell sub-tables corresponding to the BWP index a0 / a1 of cell 1 are set to {A0_0, A1_0} and {A0_1, A1_1}, and the per-cell sub-tables corresponding to the BWP index b0 / b1 of cell 2 are set to {B0_0, B1_0} and {B0_1, B1_1}, if the cell-specific (active) BWP index combination indicated through multi-cell DCI is {a0, b0}, the per-cell sub-tables {A0_0, A1_0} and {B0_0, B1_0} can be concatenated to form a multi-cell table and applied.

[0206] 3) Opt 3: When only one multi-cell table is set for all cells (belonging to the schedulable cell set), the values ​​set in the per-cell sub-table for each cell in the multi-cell table (e.g., row index in the single-cell table or code-point / state of a field in the single-cell DCI) can be interpreted / applied as the values ​​set in the BWP (index) of the cell (e.g., row index in the single-cell table or code-point / state of a field in the single-cell DCI) according to the combination of the (active) BWP indexes for each cell indicated through the multi-cell DCI.

[0207] (1) Handling out-of-range problem when applying the above Opt 3 method

[0208] Hereinafter, the Opt 3 method will be described in more detail. When only one multi-cell table (for example, having a structure like the table in FIG. 11) is set for all cells (belonging to a schedulable cell set) (all BWPs set for the corresponding cells), the values ​​set in the per-cell sub-table (or column) for each cell in the multi-cell table (for example, the row index in the single-cell table or the code-point / state of the field in the single-cell DCI) can be interpreted / applied as the values ​​set in the BWP (index) indicated for the corresponding cell (for example, the row index in the single-cell table or the code-point / state of the field in the single-cell DCI) according to the combination of the (active) BWP indexes for each cell indicated through the BWP indicator field in the multi-cell DCI. For example, based on the table of Fig. 11, the {A0, A1, A2, ...} values ​​set in the column related to Cell 1 in the table can be interpreted / applied as values ​​set in the corresponding BWP index X (e.g., row index in a single-cell table or code-point / state of a field in a single-cell DCI) when BWP index X is indicated in Cell 1 through the BWP indicator field in the multi-cell DCI, and can be interpreted / applied as values ​​set in the corresponding BWP index Y (e.g., row index in a single-cell table or code-point / state of a field in a single-cell DCI) when BWP index Y is indicated in Cell 1 through the BWP indicator field in the multi-cell DCI.

[0209] Meanwhile, the values ​​constituting each cell-specific column (or per-cell sub-table) in the above-mentioned single multi-cell table can be set using the maximum number of bits (per BWP) used for each row configuration in the single-cell table configured for each BWP configured in the corresponding cell, or the maximum number of bits (per BWP) corresponding to the field size in the single-cell DCI configured for each BWP of the corresponding cell. Fig. 13 is a diagram for explaining a table configuration for multi-cell scheduling DCI according to an embodiment. In Fig. 13, (d) Table configuration is for the Shared-state-extension method and can be provided through upper layer signaling (e.g., RRC). A specific DCI field included in MC DCI can indicate a specific row (here, a row may also be referred to as an entry) in a configured Table, and at this time, the specific DCI field may be a Shared-state-extension DCI field (e.g., RM indicator, ZP CSI-RS trigger, TCI field, SRS request, SRS offset indicator, etc.) for indicating a BWP specific parameter other than TDRA. Referring to (a) of Fig. 13, four BWPs are configured in Cell 1, two BWPs in Cell 2, three BWPs in Cell 3, and four BWPs in Cell 4. A BWP specific parameter configuration may be provided for each BWP, and the number of BWP specific parameters configured may be independent for each BWP.For example, A BWP specific parameters may be set for BWP1 of Cell 1, E BWP specific parameters may be set for BWP1 of Cell 2, I BWP specific parameters may be set for BWP1 of Cell 3, and M BWP specific parameters may be set for BWP1 of Cell 4. Under such settings, the SC DCI may indicate a BWP specific parameter through a specific DCI field (for convenience, referred to as a first DCI field). For example, referring to (c) of FIG. 13, the first DCI field of the SC DCI for BWP1 of Cell 4 may indicate one of the M BWP specific parameters set in BWP1 of Cell 4. At this time, the size of the first DCI field may be set to (at least) ┏(log2M)┓ bits. Here, ┏ ┓. means the ceiling function. The table in (d) of Fig. 13 has four per Cell Columns, where the term "Column" may also be referred to as other terms such as information, field, or sequence. The size of the per Cell Column in the table can be set independently for each cell. For example, the size of the per Cell Column of Cell 1 can be set according to the BWP that requires the most number of bits to indicate the BWP specific parameter. For example, the size of the per Cell Column of Cell 1 is Max (┏(log2A) ┓, ┏(log2B) ┓, ┏(log2C) ┓, ┏(log2D)┓) (or, equivalently, ┏ (log2Max (A, B, C, D) ┓) can be set based on. The size of the per Cell Column of Cell 2 can be set based on Max (┏(log2E)┓,┏(log2F)┓) (or, equivalently, ┏(log2Max (E, F)┓). MC DCI can include a BWP indication field and a BWP specific parameter indication field, and a row of the (d) Table can be indicated through the BWP specific parameter. A BWP specific parameter index can be provided for each cell through the row indication, and the interpretation of the indicated BWP specific parameter index can follow the indicated BWP. For example, when BWP 2 is indicated through the BWP indication field, the indicated BWP specific parameter index for Cell 1 can be the index of one BWP specific parameter indicated among the B BWP specific parameters set for BWP2 of Cell 1 as seen in (a).

[0210] In this situation, if a BWP (index) is set (a row in a single-cell table or a field in a single-cell DCI) with a number of bits (Y) less than the maximum number of bits (X) in the cell through a BWP indicator field in the multi-cell DCI, for the BWP (index), only the Y-bit corresponding to the LSB of the X-bits among the X-bit values ​​set in the column of the cell (in the multi-cell table) can be interpreted / applied (as code-points / states of the row index in the single-cell table or the field in the single-cell DCI set to the BWP (index)). Meanwhile, in the above situation, if the value corresponding to the Y-bit is not set / invalid in the single-cell table or single-cell DCI of the BWP (index), the terminal may assume that there is no scheduling in the cell and skip PUSCH / PDSCH transmission / reception on the cell, or may regard the multi-cell DCI itself as an error and discard the DCI, or may apply one of the methods of Alt 1 / 2 / 3 / 4 / 5 / 6 / 7.

[0211] (2) Minimum applicable scheduling offset (min K0 / K2) indicator field related

[0212] The minimum value of DCI (or PDCCH)-to-PDSCH offset (K0) that can be instructed to a UE through DCI for scheduling a PDSCH is referred to as min K0, and the minimum value of DCI (or PDCCH)-to-PUSCH offset (K2) that can be instructed to a UE through DCI for scheduling a PUSCH is referred to as min K2. The DCI may include a Minimum applicable scheduling offset indicator field to indicate min K0 / min K2. If min K0 / min K2 is indicated through the Minimum applicable scheduling offset indicator field in the DCI, the UE does not expect that a K0 / K2 value smaller than the indicated min K0 / min K2 will be indicated through the DL grant / UL grant DCI.

[0213] In order to support effective terminal power saving operation through min K0 / K2 indication during the above multi-cell scheduling, the presence or absence of min K0 / K2 value may be set to be the same for cells belonging to the entire schedulable cell set or cells belonging to each co-scheduled cell set (for example, the min K0 / K2 value may be set to be set to all or not set to the corresponding cells, or for this purpose, the presence or absence of min K0 / K2 may be set (commonly to all cells belonging to the corresponding set) per schedulable cell set or co-scheduled cell set), and additionally, the min K0 / K2 values ​​set for cells (all or part) belonging to the schedulable cell set or co-scheduled cell set may be set to be the same for all. In addition, the presence or absence of min K0 / K2 value may be set individually / independently for the existing single-cell DCI format and the multi-cell DCI format for the same single cell.

[0214] Fig. 14 is a diagram for explaining signal transmission and reception between a network and a terminal according to one embodiment.

[0215] Referring to FIG. 14, a terminal may receive at least one upper layer signaling from a network (A05). The upper layer signaling may include at least one of information for configuring a plurality of cells, BWP configuration information for each cell, BWP-specific parameter configuration information for each BWP, and configuration information for multi-cell scheduling. The configuration information for multi-cell scheduling may include a configuration for a table related to a row (entry) indicated by a DCI field of a DCI of multi-cell scheduling (e.g., FIG. 13(d)). In this case, each row may have a plurality of fields for a plurality of cells (e.g., a plurality of per-cell columns). The size of each of the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate a BWP-specific parameter among BWPs configured for each cell. The size of a first field for a first cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among BWPs configured for the first cell. The size of the second field for the second cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set in the second cell. Based on the fact that L bits are required in the first BWP of the first cell, M bits are required in the second BWP of the first cell, and N bits are required in the third BWP of the first cell to indicate the BWP-specific parameter, the size of the first field for the first cell among the plurality of fields may be determined as the largest number of bits among L bits, M bits, and N bits.

[0216] A terminal may receive DCI for multi-cell scheduling from a network (A10). The DCI for multi-cell scheduling may include a BWP indication field and a BWP specific parameter indication field. The BWP specific parameter indication field may indicate one of the rows of a table, and information of each field included in the indicated row may be interpreted based on BWPs indicated through the BWP indication field. For a first cell among the plurality of cells, Y bits are required to indicate the BWP-specific parameter for BWP #A indicated by the BWP indication information, and based on the fact that the size of the first field for the first cell among the plurality of fields is determined to be X bits larger than the Y bits, the base station may select Y bits from the X bits of the first field to provide the first BWP-specific parameter for the BWP #A of the first cell. The Y bits selected from the X bits of the first field may be Y least significant bits (LSBs).

[0217] The DCI may include minimum scheduling offset indication information. Whether the minimum scheduling offset is set or the value of the minimum scheduling offset may be the same for the co-scheduled cells. The minimum scheduling offset may be a minimum K0 or a minimum K2. The minimum K0 may be related to a DCI-to-PDSCH offset. The minimum K2 may be related to a DCI-to-PUSCH offset. The value of the minimum scheduling offset is for the multi-cell scheduling, and the value of the minimum scheduling offset for the multi-cell scheduling may be set separately from the minimum scheduling offset values ​​for single-cell scheduling (e.g., set via higher layer signaling).

[0218] The above DCI can schedule PDSCHs (physical downlink shared channels) or PUSCHs (physical uplink shared channels) to co-scheduled cells.

[0219] The terminal can receive PDSCHs (physical downlink shared channels) or transmit PUSCHs (physical uplink shared channels) in cells scheduled together based on DCI (A15).

[0220] Figure 15 illustrates a flow of a method performed by a terminal according to one embodiment.

[0221] Referring to FIG. 15, the terminal can receive configuration information for a table in which each row is configured to have multiple fields for multiple cells through upper layer signaling (B05).

[0222] The terminal can receive DCI (downlink control information) for multi-cell scheduling (B10).

[0223] The terminal can determine the BWPs of cells scheduled together through the DCI based on the BWP (bandwidth part) indication information of the DCI (B15).

[0224] The terminal can obtain BWP-specific parameters for the BWPs of the cells scheduled together based on the determined BWPs and the table (B20). The BWP-specific parameters set in the plurality of fields included in each row of the table can be interpreted based on the determined BWPs. The size of each of the plurality of fields can be determined based on the BWP that requires the largest number of bits to indicate the BWP-specific parameters among the BWPs set for each cell.

[0225] The size of a first field for a first cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set in the first cell. The size of a second field for a second cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set in the second cell.

[0226] To indicate the above BWP-specific parameters, based on the fact that L-bits are required in the first BWP of the first cell, M-bits are required in the second BWP of the first cell, and N-bits are required in the third BWP of the first cell, the size of the first field for the first cell among the plurality of fields may be determined as the largest number of bits among L-bits, M-bits, and N-bits.

[0227] For a first cell among the plurality of cells, Y bits are required to indicate the BWP-specific parameter for BWP #A determined based on the BWP indication information, and based on the size of a first field for the first cell among the plurality of fields being determined to be X bits larger than the Y bits, the terminal can obtain the first BWP-specific parameter for the BWP #A of the first cell by selecting Y bits from the X bits of the first field. The Y bits selected from the X bits of the first field may be Y least significant bits (LSBs).

[0228] The above DCI may include information for indicating one row in the above table.

[0229] The DCI may schedule physical downlink shared channels (PDSCHs) or physical uplink shared channels (PUSCHs) for the co-scheduled cells. The DCI may include minimum scheduling offset indication information related to a minimum scheduling offset from the DCI to the PDSCHs or the PUSCHs. Whether the minimum scheduling offset is set or the value of the minimum scheduling offset may be the same for the co-scheduled cells. The minimum scheduling offset may be a minimum K0 or a minimum K2. The minimum K0 may be related to a DCI-to-PDSCH offset. The minimum K2 may be related to a DCI-to-PUSCH offset. The value of the minimum scheduling offset is for the multi-cell scheduling, and the value of the minimum scheduling offset for the multi-cell scheduling may be set separately from minimum scheduling offset values ​​for single-cell scheduling.

[0230] FIG. 16 illustrates a flow of a method performed by a base station according to one embodiment.

[0231] Referring to FIG. 16, a base station may transmit configuration information for a table in which each row has a plurality of fields for a plurality of cells via upper layer signaling (C05). The size of each of the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate a BWP-specific parameter among BWPs set for each cell. The size of a first field for a first cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among BWPs set for the first cell. The size of a second field for a second cell among the plurality of fields may be determined based on a BWP that requires the largest number of bits to indicate the BWP-specific parameter among BWPs set for the second cell. To indicate the above BWP-specific parameters, based on the fact that L-bits are required in the first BWP of the first cell, M-bits are required in the second BWP of the first cell, and N-bits are required in the third BWP of the first cell, the size of the first field for the first cell among the plurality of fields may be determined as the largest number of bits among L-bits, M-bits, and N-bits.

[0232] The base station can determine the BWPs of cells to be scheduled together through DCI for multi-cell scheduling (C10). The base station can indicate the BWPs of cells to be scheduled together through the DCI based on the BWP (bandwidth part) indication information of the DCI.

[0233] The base station can transmit DCI for multi-cell scheduling (C15).

[0234] The BWP-specific parameters set in the plurality of fields included in each row of the above table can be interpreted based on the indicated BWPs.

[0235] For a first cell among the plurality of cells, Y bits are required to indicate the BWP-specific parameter for BWP #A indicated by the BWP indication information, and based on the fact that the size of a first field for the first cell among the plurality of fields is determined to be X bits larger than the Y bits, the base station may select Y bits from among the X bits of the first field to provide the first BWP-specific parameter for the BWP #A of the first cell. The Y bits selected from the X bits of the first field may be Y least significant bits (LSBs).

[0236] The above DCI may include information for indicating one row in the above table.

[0237] The DCI may schedule physical downlink shared channels (PDSCHs) or physical uplink shared channels (PUSCHs) for the co-scheduled cells. The DCI may include minimum scheduling offset indication information related to a minimum scheduling offset from the DCI to the PDSCHs or the PUSCHs. Whether the minimum scheduling offset is set or the value of the minimum scheduling offset may be the same for the co-scheduled cells. The minimum scheduling offset may be a minimum K0 or a minimum K2. The minimum K0 may be related to a DCI-to-PDSCH offset. The minimum K2 may be related to a DCI-to-PUSCH offset. The value of the minimum scheduling offset is for the multi-cell scheduling, and the value of the minimum scheduling offset for the multi-cell scheduling may be set separately from minimum scheduling offset values ​​for single-cell scheduling.

[0238] Fig. 17 illustrates a communication system (1).

[0239] Referring to FIG. 17, a communication system (1) includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and can be implemented in the form of HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0240] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0241] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and communication between base stations (150c) (e.g., relay, IAB (Integrated Access Backhaul). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes can be performed based on various proposals of the present invention.

[0242] Figure 18 illustrates a wireless device applicable to the present invention.

[0243] Referring to FIG. 18, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 17.

[0244] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In this specification, wireless device may also mean a communication modem / circuit / chip.

[0245] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In this specification, a wireless device may also mean a communication modem / circuit / chip.

[0246] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). 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, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0247] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0248] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as 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 internally and / or externally 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 technologies, such as wired or wireless connections.

[0249] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0250] Figure 19 illustrates another example of a wireless device applicable to the present disclosure. The wireless device may be implemented in various forms depending on the use case / service (see Figure 17).

[0251] Referring to FIG. 19, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 18 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and an additional element (140). The communication unit may include a communication circuit (112) and a transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 18. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 18. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0252] The additional element (140) may be configured in various ways depending on the type of the wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 17, 100a), a vehicle (Fig. 17, 100b-1, 100b-2), an XR device (Fig. 17, 100c), a portable device (Fig. 17, 100d), a home appliance (Fig. 17, 100e), an IoT device (Fig. 17, 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 / environmental device, an AI server / device (Fig. 17, 400), a base station (Fig. 17, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0253] In FIG. 19, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of one or more processor sets. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0254] Figure 20 illustrates a vehicle or autonomous vehicle applicable to the present disclosure. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned or unmanned aerial vehicle (AV), a ship, or the like.

[0255] Referring to FIG. 20, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 of FIG. 19, respectively.

[0256] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit (120) can control elements of the vehicle or autonomous vehicle (100) to perform various operations. The control unit (120) can include an ECU (Electronic Control Unit). The drive unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The drive unit (140a) can include 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 can include a wired / wireless charging circuit, a battery, etc. The sensor unit (140c) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (140c) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward 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) may implement a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0257] For example, the communication unit (110) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (140d) can generate an autonomous driving route and driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or autonomous vehicle (100) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit (140c) can acquire vehicle status and surrounding environment information. The autonomous driving unit (140d) can update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to the external server. External servers can predict traffic information data in advance using AI technology or other technologies based on information collected from vehicles or autonomous vehicles, and provide the predicted traffic information data to the vehicles or autonomous vehicles.

[0258] The embodiments described above are combinations of components and features of the present invention in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, it is also possible to form an embodiment of the present invention by combining some components and / or features. The order of operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is self-evident that claims that do not have an explicit citation relationship in the patent claims may be combined to form an embodiment or may be incorporated as a new claim through a post-application amendment.

[0259] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the scope of the invention. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0260] The present disclosure may be used in a terminal, base station, or other equipment of a wireless mobile communication system.

Claims

1. In a method performed by a terminal, Receive configuration information for a table where each row is configured to have multiple fields for multiple cells via upper layer signaling; Receiving DCI (downlink control information) for multi-cell scheduling; and Including determining BWPs of cells scheduled together through the DCI based on BWP (bandwidth part) indication information of the DCI, The BWP-specific parameters set in the plurality of fields included in each row of the above table are interpreted based on the determined BWPs, A method wherein the size of each of the above plurality of fields is determined based on a BWP that requires the largest number of bits to indicate a BWP-specific parameter among the BWPs set in each cell.

2. In paragraph 1, The size of the first field for the first cell among the plurality of fields is determined based on the first BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set in the first cell, A method wherein the size of the second field for the second cell among the plurality of fields is determined based on the second BWP that requires the largest number of bits to indicate the BWP-specific parameter among the BWPs set in the second cell.

3. In paragraph 1, A method wherein the size of a first field for the first cell among the plurality of fields is determined as the largest number of bits among L-bits, M-bits, and N-bits, based on the fact that L-bits are required in the first BWP of the first cell, M-bits are required in the second BWP of the first cell, and N-bits are required in the third BWP of the first cell to indicate the BWP-specific parameters.

4. In paragraph 1, A method in which Y-bits are required to indicate the BWP-specific parameter for a first BWP determined based on the BWP indication information for a first cell among the plurality of cells, and based on the size of a first field for the first cell among the plurality of fields being determined to be X-bits larger than the Y-bits, the terminal selects Y-bits from among the X-bits of the first field to obtain the first BWP-specific parameter for the first BWP of the first cell.

5. In paragraph 4, A method wherein the Y-bits selected from the X-bits of the first field are Y least significant bits (LSBs).

6. In paragraph 1, A method wherein the DCI includes information for indicating one row in the table.

7. In paragraph 1, The above DCI schedules PDSCHs (physical downlink shared channels) or PUSCHs (physical uplink shared channels) to the co-scheduled cells, The DCI includes minimum scheduling offset indication information related to the minimum scheduling offset from the DCI to the PDSCHs or the PUSCHs, A method for setting the minimum scheduling offset or for ensuring that the value of the minimum scheduling offset is the same for the cells scheduled together.

8. In paragraph 7, The above minimum scheduling offset is at least K0 or at least K2, The above minimum K0 is related to the DCI-to-PDSCH offset, The above minimum K2 is related to the DCI-to-PUSCH offset, the method.

9. In paragraph 7, The value of the above minimum scheduling offset is for the multi-cell scheduling, A method wherein the value of the minimum scheduling offset for the multi-cell scheduling is set separately from the minimum scheduling offset values ​​for single-cell scheduling.

10. A non-transitory computer-readable recording medium having recorded thereon commands configured to cause the terminal to perform the method described in claim 1 when executed by the processor of the terminal.

11. In the device, memory for storing commands; and A processor that performs operations by executing the above instructions, The operations of the above processor are: Receive configuration information for a table where each row is configured to have multiple fields for multiple cells via upper layer signaling; Receiving DCI (downlink control information) for multi-cell scheduling; and Including determining BWPs of cells scheduled together through the DCI based on BWP (bandwidth part) indication information of the DCI, The BWP-specific parameters set in the plurality of fields included in each row of the above table are interpreted based on the determined BWPs, A device wherein the size of each of the plurality of fields is determined based on the BWP that requires the largest number of bits to indicate a BWP-specific parameter among the BWPs set in each cell.

12. In paragraph 11, Including a transmitter and receiver, The above device is a terminal for wireless communication.

13. In paragraph 11, The above device is a processing device configured to control a terminal for wireless communication.

14. In a method performed by a base station, Transmitting configuration information for a table where each row is configured to have multiple fields for multiple cells via upper layer signaling; and Including transmitting DCI for multi-cell scheduling, Based on the BWP (bandwidth part) indication information of the DCI, the BWPs of cells scheduled together through the DCI are indicated, The BWP-specific parameters set in the plurality of fields included in each row of the above table are interpreted based on the indicated BWPs, A method wherein the size of each of the above plurality of fields is determined based on a BWP that requires the largest number of bits to indicate a BWP-specific parameter among the BWPs set in each cell.

15. At the base station, memory for storing commands; and A processor that performs operations by executing the above instructions, The operations of the above processor are: Transmitting configuration information for a table where each row is configured to have multiple fields for multiple cells via upper layer signaling; and Including transmitting DCI for multi-cell scheduling, Based on the BWP (bandwidth part) indication information of the DCI, the BWPs of cells scheduled together through the DCI are indicated, The BWP-specific parameters set in the plurality of fields included in each row of the above table are interpreted based on the indicated BWPs, A base station, wherein the size of each of the plurality of fields is determined based on a BWP that requires the largest number of bits to indicate a BWP-specific parameter among the BWPs set for each cell.

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