Terminal, wireless communication method, and base station

Abstract

The terminal according to one aspect of the present disclosure includes: a control unit that, in an active downlink bandwidth part (DL BWP) of a certain serving cell, when no CORESET pool index is provided or the provided CORESET pool index value = 0 for one or more first control resource sets, i.e., first CORESET (COntrol REsource SET), and the provided CORESET pool index value = 1 for one or more second CORESETs, and when an acknowledgement (ACK) / negative acknowledgement (NACK) feedback mode = joint feedback is provided for the serving cell, determines a physical downlink control channel (PDCCH) monitoring opportunity associated with the joint feedback, i.e., a PDCCH monitoring opportunity, or an index of a downlink control information (DCI) format, i.e., a DCI format; and a transmission unit that transmits a hybrid automatic repeat request (HARQ)-ACK using a HARQ-ACK codebook determined based on the index or a physical uplink control channel (PUCCH) resource. According to one aspect of the present disclosure, HARQ-ACK feedback can be appropriately performed when using multiple panels / TRPs.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further large capacity and high performance in 3GPP LTE (Third Generation Partnership Project (3GPP)) Release (Rel.) 8, 9.

[0003] Subsequent systems of LTE have also been studied (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In NR, one or more Transmission / Reception Points (TRPs) (multi-TRP) using one or more panels (multi-panel) are being studied for DL transmission to a user terminal (user equipment (UE)) (e.g., Physical Downlink Shared Channel (PDSCH) transmission).

[0009] In NR, for multiple PDSCHs from multiple TRPs (which may also be referred to as multi-PDSCH (multiple PDSCH)), joint HARQ-ACK feedback for transmitting the Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) corresponding to the PDSCHs of multiple TRPs for one TRP and separate HARQ-ACK feedback for transmitting dedicated HARQ-ACK for each TRP are being studied.

[0010] In Rel.16 NR, setting the feedback mode in the UE is being studied based on a higher layer parameter (which may also be referred to as "ackNackFeedbackMode", "ackNackFeedbackMode-r16", ACKNACK feedback mode, etc.) indicating whether the feedback mode used within one time slot represents joint feedback or separate feedback.

[0011] However, how the UE determines the bits of the type 2 HARQ-ACK codebook in the case of joint feedback set as the ACKNACK feedback mode and how to determine the PUCCH resources for joint feedback have not been fully studied. Without clarifying such a structure, HARQ-ACK feedback cannot be properly performed in the case of multi-TRP, and there is a concern about throughput reduction or communication quality degradation.

[0012] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can properly perform HARQ-ACK feedback when using multi-panel / TRP.

[0013] Means for Solving the Problem

[0014] A terminal according to one aspect of the present disclosure includes: a control unit that, in an active downlink bandwidth part (DL BWP) of a certain serving cell, determines an index of a physical downlink control channel (PDCCH) monitoring opportunity or a downlink control information (DCI) format associated with joint feedback when a CORESET pool index is not provided or the value of the provided CORESET pool index = 0 for one or more first control resource sets, i.e., first CORESETs, and the value of the provided CORESET pool index = 1 for one or more second CORESETs, and an acknowledgement (ACK) / negative acknowledgement (NACK) feedback mode = joint feedback is provided for the serving cell; and a transmission unit that transmits a hybrid automatic repeat request (HARQ)-ACK using a HARQ-ACK codebook determined based on the index or a physical uplink control channel (PUCCH) resource.

[0015] Advantageous Effects of the Invention

[0016] According to one aspect of the present disclosure, HARQ-ACK feedback can be appropriately performed when using multiple panels / TRPs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is an example diagram showing a multi-TRP scenario.

[0018] Figure 2 FIG. is an example diagram showing an operation of the first embodiment.

[0019] Figure 3 FIG. is an example diagram showing a schematic configuration of a wireless communication system according to one embodiment.

[0020] Figure 4 FIG. is an example diagram showing a configuration of a base station according to one embodiment.

[0021] Figure 5This is a diagram showing an example of the structure of a user terminal according to an embodiment.

[0022] Figure 6 This is a diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment. Detailed Embodiment

[0023] (HARQ-ACK Codebook)

[0024] The UE may also use one PUCCH resource to send HARQ-ACK feedback in units of a HARQ-ACK codebook composed of bits of one or more delivery confirmation messages (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)). The HARQ-ACK bits may also be referred to as HARQ-ACK information, HARQ-ACK information bits, etc.

[0025] Here, the HARQ-ACK codebook may also be composed of HARQ-ACK bits in units of at least one of a time domain (e.g., time slot), a frequency domain (e.g., Component Carrier (CC)), a spatial domain (e.g., layer), a transport block (TB), and a code block group (CBG) constituting the TB. The HARQ-ACK codebook may also be abbreviated as a codebook.

[0026] In addition, the number of bits (size), etc. included in the HARQ-ACK codebook may be determined semi-statically or dynamically. The HARQ-ACK codebook whose size is determined semi-statically is also referred to as a semi-static HARQ-ACK codebook, a type 1 HARQ-ACK codebook, etc. The HARQ-ACK codebook whose size is determined dynamically is also referred to as a dynamic HARQ-ACK codebook, a type 2 HARQ-ACK codebook, etc.

[0027] It is also possible to use a higher layer parameter (e.g., pdsch-HARQ-ACK-Codebook) to set which one of the type 1 HARQ-ACK codebook and the type 2 HARQ-ACK codebook is used in the UE.

[0028] In the case of a Type 1 HARQ-ACK codebook, the UE may also, within a certain range (e.g., a range set based on a higher layer parameter), regardless of the scheduling of the PDSCH, feedback HARQ-ACK bits for PDSCH candidates (or PDSCH opportunities (occasions)) corresponding to that range.

[0029] This range may also be determined based on at least one of a certain period (e.g., a set of a specific number of occasions for receiving the candidate PDSCH, or a specific number of monitoring occasions (monitoring occasions) of the downlink control channel (Physical Downlink Control Channel (PDCCH))), the number of CCs set or activated in the UE, the number of TBs (number of layers or ranks), the number of CBGs per 1 TB, and the presence or absence of spatial bundling applications. This specific range is also referred to as a HARQ-ACK window, a HARQ-ACK bundling window, a HARQ-ACK feedback window, etc.

[0030] In a Type 1 HARQ-ACK codebook, if within a specific range, even in the case where there is no scheduling of the PDSCH for the UE, the UE ensures the HARQ-ACK bits for that PDSCH within the codebook. In the case where it is determined that the PDSCH is not actually scheduled, the UE can feedback this bit as a NACK bit.

[0031] On the other hand, in the case of a Type 2 HARQ-ACK codebook, the UE may also, within the above specific range, feedback HARQ-ACK bits for the scheduled PDSCH.

[0032] Specifically, the UE may also determine the number of bits of the Type 2 HARQ-ACK codebook based on a specific field within the DCI (e.g., the DL assignment index (Downlink Assignment Indicator (Index)) (DAI) field). The DAI field may also include a counter DAI (Counter DAI (C-DAI)) and a total DAI (Total DAI (T-DAI)).

[0033] C-DAI can also represent the counter value of the downlink transmissions (PDSCH, data, TB) scheduled within a specific period. For example, the C-DAI in the DCI that schedules data within this specific period can also represent the quantity that is initially counted in the frequency domain (e.g., CC) and then in the time domain within this specific period. For example, C-DAI can also correspond to the value obtained by counting the PDSCH receptions or semi-persistent scheduling (SPS) releases in ascending order of the serving cell index and then in ascending order of the PDCCH monitoring opportunities for more than one DCI included within a specific period.

[0034] T-DAI can also represent the total value (total number) of the data scheduled within a specific period. For example, the T-DAI in the DCI that schedules data in a certain time unit (e.g., PDCCH monitoring opportunity) within this specific period can also represent the total number of the data scheduled up to this time unit (also referred to as a point, timing, etc.) within this specific period.

[0035] (Multi-TRP)

[0036] In NR, one or more transmission / reception points (TRP) (multi-TRP (MTRP)) are being studied to perform DL transmission for the UE using one or more panels. In addition, it is being studied that the UE uses one or more panels to perform UL transmission for one or more TRP.

[0037] In addition, multiple TRP can correspond to either the same cell identifier (cell ID) or different cell IDs. This cell ID can be either a physical cell ID or a virtual cell ID.

[0038] Figure 1 It is a diagram showing an example of the multi-TRP scenario. In these examples, it is assumed that each TRP and the UE can utilize two different beams, but it is not limited to this.

[0039] Multi-TRP (TRP#1, #2) can also be connected through ideal / non-ideal backhaul to exchange information, data, etc. Different codewords (CW) and different layers can be transmitted from each of the multi-TRP. As a way of multi-TRP transmission, non-coherent joint transmission (NCJT) can also be used.

[0040] In NCJT, for example, TRP#1 performs modulation mapping and layer mapping on the first codeword, and uses the first precoding to transmit the first PDSCH with the first number of layers (e.g., 2 layers). In addition, TRP#2 performs modulation mapping and layer mapping on the second codeword, and uses the second precoding to transmit the second PDSCH with the second number of layers (e.g., 2 layers).

[0041] In addition, multiple PDSCHs (multi-PDSCH) subject to NCJT can also be defined as partially or completely repeating with respect to at least one of the time domain and the frequency domain. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP can also repeat with respect to at least one of the time and frequency resources.

[0042] It can also be envisioned that these first PDSCH and second PDSCH are not in a Quasi-Co-Location (QCL) relationship (not quasi-co-located). The reception of multi-PDSCH can also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0043] The UE receives multiple PDSCHs (which can also be referred to as multi-PDSCH (multiple PDSCH)) from multiple TRPs based on one or more DCIs. In addition, in this example, for multi-PDSCH, for one TRP (TRP#1 or #2), HARQ-ACK (Acknowledgement (ACK) / Negative Acknowledgement (NACK)) corresponding to the PDSCH of TRP#1 and HARQ-ACK (ACK / NACK) corresponding to the PDSCH of TRP#2 are sent. Such HARQ-ACK feedback can also be referred to as joint feedback, joint HARQ-ACK feedback, etc.

[0044] In addition, the UE can also send different HARQ-ACKs related to different TRPs for different TRPs. Such HARQ-ACK feedback can also be referred to as separate feedback, separate HARQ-ACK feedback, etc. In this disclosure, "separate" and "independent" can also be used interchangeably.

[0045] According to such a multi-TRP scenario, more flexible transmission control using a good-quality channel can be performed.

[0046] In Rel.16 NR, it is being studied to set the feedback mode in a UE according to a higher layer parameter (which may also be referred to as "ackNackFeedbackMode", "ackNackFeedbackMode-r16", ACKNACK feedback mode, etc.) indicating whether the feedback mode used within a time slot represents joint feedback or separate feedback.

[0047] However, regarding how a UE determines the bits of a type 2 HARQ-ACK codebook (which may also be referred to as a joint dynamic HARQ-ACK codebook, a joint type 2 HARQ-ACK codebook, etc.) in the case where joint feedback is set as the ACKNACK feedback mode, and how to determine the PUCCH resources for joint feedback, etc., there has not been sufficient research.

[0048] For example, in the determination of the bits of a type 2 HARQ-ACK codebook, the UE determines the PDCCH monitoring opportunities for the PDCCH of the DCI format for scheduling PDSCH reception or SPS PDSCH release associated with the same PUCCH as the time slot for transmitting HARQ-ACK. For these PDCCH monitoring opportunities, indices are allocated based on a certain rule, and based on these indices, the arrangement order of the bits of this type 2 HARQ-ACK codebook is determined. However, regarding this rule related to the joint type 2 HARQ-ACK codebook, the research has not progressed.

[0049] If such a structure is not clear, in the case of multiple TRPs, HARQ-ACK feedback cannot be appropriately performed, and there is a concern about a reduction in throughput or deterioration of communication quality.

[0050] Therefore, the inventors of the present invention have come up with a method for appropriately performing HARQ-ACK feedback in the case of using multiple panels / TRPs.

[0051] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods related to each embodiment can be applied separately or in combination.

[0052] In the present disclosure, "A / B" and "at least one of A and B" can also be replaced with each other.

[0053] In the present disclosure, the panel, uplink (UL) transmission entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, antenna port of a certain signal (e.g., demodulation reference signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., code division multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer) can also be replaced with each other. In addition, the panel identifier (ID) and the panel can also be replaced with each other. In the present disclosure, the TRP ID and the TRP can also be replaced with each other.

[0054] In the present disclosure, the index, ID, indicator, resource ID, etc. can also be replaced with each other.

[0055] (Wireless communication method)

[0056] <First Embodiment>

[0057] In the first embodiment, the set of PDCCH monitoring opportunities for DCI formats used for scheduling PDSCH reception or SPS PDSCH release is defined as the union of PDCCH monitoring opportunities over the set active downlink bandwidth part (DL BWP) of the set service cell.

[0058] In the first embodiment, PDCCH monitoring occasions are first indexed in an ascending order across serving cell indexes for a same start time of search space sets associated with DCI formats scheduling PDSCH receptions or SPS PDSCH release on the serving cells, and are then indexed in an ascending order of start times of the search space sets.

[0059] For indexing within a serving cell for a same start time of search space sets, if the UE is not provided CORESETPoolIndex or is provided CORESETPoolIndex with value 0 for one or more first CORESETs and is provided CORESETPoolIndex with value 1 for one or more second CORESETs on an active DL BWP of a serving cell, and is provided ACKNACK Feedback Mode = Joint Feedback for the serving cell, PDCCH monitoring occasions for the first CORESETs are indexed prior to PDCCH monitoring occasions for the second CORESETs.

[0060] The cardinality of the set of PDCCH monitoring occasions defines a total number M of PDCCH monitoring occasions.

[0061] In addition, in the present disclosure, the expressions “ACKNACK feedback mode = joint feedback is provided for the serving cell” and “ACKNACK feedback mode = joint feedback is provided”, “ACKNACK feedback mode = joint feedback is provided for the cell group to which the serving cell belongs” can also be replaced with each other.

[0062] In addition, a higher layer parameter (e.g., ackNackFeedbackMode) indicating the ACKNACK feedback mode can be set for each serving cell or for each cell group.

[0063] The UE can also assign an index to the determined PDCCH monitoring opportunity corresponding to the joint HARQ-ACK feedback based on the above index rule, and determine the joint type 2 HARQ-ACK codebook based on the index.

[0064] Figure 2 FIG. is an example of the operation of the first embodiment. In this example, it is assumed that the UE has been determined for the activation of the DL BWP of a certain serving cell, the first CORESET corresponding to the value of the CORESET pool index = 0, and the second CORESET corresponding to the value of the CORESET pool index = 1.

[0065] In Figure 2 At a certain timing, the UE is set by the base station to the ACKNACK feedback mode = joint feedback. If this setting becomes effective, the UE indexes the first CORESET (PDCCH monitoring opportunity for the first CORESET) before the second CORESET (PDCCH monitoring opportunity for the second CORESET).

[0066] Before receiving this setting or before this setting becomes effective, the UE does not need to (may not) index the first CORESET (PDCCH monitoring opportunity for the first CORESET) before the second CORESET (PDCCH monitoring opportunity for the second CORESET).

[0067] According to the first embodiment described above, in accordance with the above index rule, the joint type 2 HARQ-ACK codebook can be appropriately determined.

[0068] <Second Embodiment>

[0069] In the second embodiment, for PUCCH transmission with HARQ-ACK information (e.g., joint feedback transmission), after the UE determines a set of multiple PUCCH resources, it determines one PUCCH resource.

[0070] The determination of the PUCCH resource is based on a PUCCH resource indicator field, if present, in a last DCI format, among the DCI formats that have a value of a PDSCH-to-HARQ_feedback timing indicator field, if present, or a value of dl-DataToUL-ACK, or a value of dl-DataToUL-ACKForDCIFormat1_2 for DCI format 1_2, indicating a same slot for the PUCCH transmission, that the UE detects and for which the UE transmits corresponding HARQ-ACK information in the PUCCH.

[0071] In the second embodiment, for PUCCH resource determination, detected DCI formats are first indexed in an ascending order across serving cells indexes for a same PDCCH monitoring occasion and are then indexed in an ascending order across PDCCH monitoring occasion indexes.

[0072] For indexing DCI formats within a serving cell for a same PDCCH monitoring occasion, if the UE is not provided CORESETPoolIndex or is provided CORESETPoolIndex with value 0 for one or more first CORESETs and is provided CORESETPoolIndex with value 1 for one or more second CORESETs on an active DL BWP of a serving cell, and with ACKNACKFeedbackMode = JointFeedback for the active UL BWP, detected DCI formats from PDCCH receptions in the first CORESETs are indexed prior to detected DCI formats from PDCCH receptions in the second CORESETs.

[0073] According to the second embodiment described above, in compliance with the indexing rules described above, the last DCI format can be determined, and the PUCCH resources for joint feedback can be appropriately determined.

[0074] <Other Embodiments>

[0075] A UE provided with ACKNACKFeedbackMode = JointFeedback may also use the following indexing rules instead of the indexing rules of the first embodiment:

[0076] · The set of PDCCH monitoring occasions for a DCI format scheduling PDSCH receptions or SPS PDSCH release is defined as the union of PDCCH monitoring occasions across active DL BWPs of configured serving cells, ordered in an ascending order of start time of the search space set associated with a PDCCH monitoring occasion.

[0077] According to this indexing rule, the index of the PDCCH monitoring occasion can be determined based only on the time domain, without depending on elements such as the frequency domain and the CORESET pool (or TRP) domain, and a reduction in UE load can be expected.

[0078] In addition, even when using the above indexing rule instead of the indexing rule of the first embodiment, the indexing rule of the second embodiment can also be used.

[0079] [Variants of the First and Second CORESETs]

[0080] In each of the above embodiments, the first CORESET corresponds to a CORESET that is not provided with a CORESET pool index or has a CORESET pool index value of 0, and the second CORESET corresponds to a CORESET that has a CORESET pool index value of 1, but is not limited to these.

[0081] For example, the first CORESET can also be replaced with a CORESET that is not provided with a CORESET pool index, and the second CORESET can also be replaced with a CORESET that has a CORESET pool index value of 1.

[0082] For example, the first CORESET may also be replaced with a CORESET for which no CORESET pool index is provided, and the second CORESET may also be replaced with a CORESET for which a CORESET pool index is provided (the value may also be any value).

[0083] In addition, in the present disclosure, "the case where the UE is not provided with a CORESET pool index or is provided with a CORESET pool index having a value of 0 for one or more first CORESETs and is provided with a CORESET pool index having a value of 1 for one or more second CORESETs in an active DL BWP of a certain serving cell" ("if the UE is not provided CORESETPoolIndex or is provided CORESETPoolIndex with value 0 for one or more first CORESETs and is provided CORESETPoolIndex with value 1 for one or more second CORESETs on an active DL BWP of a serving cell") and "the case where the UE is not provided with a CORESET pool index or is provided with a CORESET pool index having a value of 0 for one or more first CORESETs in an active DL BWP of a certain serving cell, and is provided with a CORESET pool index having a value of 1 for one or more second CORESETs in an active DL BWP of a certain serving cell" ("if the UE is not provided CORESETPoolIndex or is provided CORESETPoolIndex with value 0 for one or more first CORESETs on an active DL BWP of a serving cell, and is provided CORESETPoolIndex with value 1 for one or more second CORESETs on an active DL BWP of a serving cell") may also be replaced with each other.

[0084] In addition, in the present disclosure, an active DL BWP and multiple active DL BWPs may also be interchangeable. Further, in the present disclosure, the "active DL BWP of a certain serving cell" to which the first CORESET belongs (or is associated with) may be the same as or different from the "active DL BWP of a certain serving cell" to which the second CORESET belongs (or is associated with).

[0085] (Wireless communication system)

[0086] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure is used for communication.

[0087] Figure 3 FIG. is an example showing a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0088] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0089] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (MN), and the base station (gNB) of NR is the secondary node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0090] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR dual connectivity (NN-DC))).

[0091] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0092] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0093] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0094] Furthermore, the user terminal 20 may also communicate in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0095] Multiple base stations 10 can also be connected via wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is utilized as backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to the relay station can also be referred to as an IAB node.

[0096] The base station 10 can also be connected to the core network 30 via other base stations 10 or directly. The core network 30 can also include, for example, at least one of the Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0097] The user terminal 20 can also be a terminal that supports at least one of communication methods such as LTE, LTE-A, 5G, etc.

[0098] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be utilized. For example, in at least one of the Downlink (DL) and Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can also be utilized.

[0099] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be applied in the wireless access methods of UL and DL.

[0100] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc., which are shared among the respective user terminals 20, can also be used.

[0101] In addition, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc., which are shared among the respective user terminals 20, can also be used.

[0102] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can be transmitted through the PBCH.

[0103] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of the PDSCH and the PUSCH.

[0104] In addition, the DCI that schedules the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be replaced with DL data, and the PUSCH can also be replaced with UL data.

[0105] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be utilized. A CORESET corresponds to the resource for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space configuration.

[0106] One search space can also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces can also be referred to as a search space set. Additionally, in the present disclosure, terms such as "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. can be used interchangeably.

[0107] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., which can also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) can also be transmitted via PUCCH. A random access preamble for establishing a connection with the cell can also be transmitted via PRACH.

[0108] Furthermore, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". In addition, it can also be expressed without "Physical" at the beginning of various channels.

[0109] In the wireless communication system 1, it is also possible to transmit a synchronization signal (SS), a downlink reference signal (DL-RS), etc. As the DL-RS, in the wireless communication system 1, it is also possible to transmit a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc.

[0110] The synchronization signal may also be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0111] In addition, in the wireless communication system 1, as an uplink reference signal (UL-RS), it is also possible to transmit a reference signal for measurement (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, DMRS may also be referred to as a user equipment-specific reference signal (UE-specific Reference Signal).

[0112] (Base station)

[0113] Figure 4This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission path interface 140 may be provided.

[0114] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0115] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which this disclosure relates.

[0116] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission and reception, measurement, etc., using the transmission and reception unit 120, the transmission and reception antennas 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting up, releasing, etc.) of communication channels, manage the status of the base station 10, manage radio resources, etc.

[0117] The transceiver unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on the common knowledge in the technical field involved in this disclosure.

[0118] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0119] The transmitting and receiving antenna 130 can be composed of antennas that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna and the like.

[0120] The transmitting and receiving unit 120 can also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmitting and receiving unit 120 can also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0121] The transmitting and receiving unit 120 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0122] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform, for example, processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0123] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmitting processing such as channel coding (which can include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0124] For the baseband signal, the transmitting and receiving unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc., and transmit the radio frequency band signal via the transmitting and receiving antenna 130.

[0125] On the other hand, for the radio frequency band signal received through the transmitting and receiving antenna 130, the transmitting and receiving unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc.

[0126] For the obtained baseband signal, the transmission / reception unit 120 (reception processing unit 1212) can also apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to obtain user data and the like.

[0127] The transmission / reception unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 can also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 110.

[0128] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0129] In addition, the transmission unit and reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0130] In addition, the control unit 110 can also be conceived as follows: for the user terminal 20, in an active downlink bandwidth part (DL BWP) of a serving cell, when no CORESET pool index is provided or the value of the provided CORESET pool index = 0 for one or more first control resource sets, i.e., the first COntrol REsource SET (CORESET), and the value of the provided CORESET pool index = 1 for one or more second CORESETs, and when the acknowledgement (ACK) / negative acknowledgement (NACK) feedback mode provided for the serving cell = joint feedback, the terminal determines the physical downlink control channel (PDCCH) monitoring opportunity associated with the joint feedback, i.e., the PDCCH monitoring opportunity, or the index of the downlink control information (DCI) format, i.e., the DCI format.

[0131] The transmitting and receiving unit 120 can also receive a hybrid automatic repeat request (HARQ)-ACK codebook, i.e., the HARQ-ACK codebook, determined based on the index, or HARQ-ACK transmitted using a physical uplink control channel (PUCCH) resource.

[0132] (User terminal)

[0133] Figure 5 FIG. [FIG number] is an example showing the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting and receiving unit 220, and a transmitting and receiving antenna 230. In addition, one or more of the control unit 210, the transmitting and receiving unit 220, and the transmitting and receiving antenna 230 can be provided respectively.

[0134] In addition, in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can be conceived that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0135] Note: The "[[FIG number]]" in the translation of needs to be replaced with the actual figure number. Also, the " " etc. tags are preserved as they are without any translation as per the requirements.The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0136] The control unit 210 can also control the generation, mapping, etc. of signals. The control unit 210 can also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0137] The transmission / reception unit 220 can also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 can also include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0138] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit can also be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0139] The transmission / reception antenna 230 can be composed of an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna, etc.

[0140] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0141] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0142] The transmission / reception unit 220 (transmission processing unit 2211) can, for example, also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0143] The transmission / reception unit 220 (transmission processing unit 2211) can also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0144] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is active (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-mentioned transmission processing.

[0145] The transmission / reception unit 220 (RF unit 222) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0146] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0147] The transmission / reception unit 220 (reception processing unit 2212) can also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0148] The transmission / reception unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 can also measure the received power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0149] In addition, the transmission unit and reception unit of the user terminal 20 in the present disclosure can also be composed of at least one of the transmission / reception unit 220, the transmission / reception antenna 230, and the transmission path interface 240.

[0150] In addition, the control unit 210 may also be in an active downlink bandwidth part (Downlink Bandwidth Part (DL BWP)) of a serving cell. When no CORESET pool index is provided or the value of the provided CORESET pool index = 0 for more than one first control resource set, i.e., the first CORESET (COntrol REsource SET), and the value of the provided CORESET pool index = 1 for more than one second CORESET, and when the acknowledgement (ACK) / negative acknowledgement (NACK) feedback mode associated with the serving cell is the combined feedback mode, it determines the physical downlink control channel (PDCCH) monitoring opportunity associated with the combined feedback, i.e., the PDCCH monitoring opportunity, or the index of the downlink control information (DCI) format, i.e., the DCI format.

[0151] The transmitting and receiving unit 220 may also use the hybrid automatic repeat request (HARQ)-ACK codebook, i.e., the HARQ-ACK codebook, or the physical uplink control channel (PUCCH) resources determined based on the index to transmit HARQ-ACK.

[0152] For example, the control unit 210 may also determine a rule (index rule) for determining whether the index of the PDCCH monitoring opportunity or DCI format associated with the first CORESET is larger or smaller than the index of the PDCCH monitoring opportunity or DCI format associated with the second CORESET.

[0153] For example, the control unit 210 may also assume that for the same start time of the search space set, the PDCCH monitoring opportunity for the first CORESET is indexed earlier than the PDCCH monitoring opportunity for the second CORESET. The earlier indexed one may correspond to either a smaller index value or a larger index value.

[0154] The control unit 210 can also be conceived such that, with respect to the same PDCCH monitoring occasion, the DCI format detected from the PDCCH reception in the first CORESET is indexed prior to the DCI format detected from the PDCCH reception in the second CORESET.

[0155] (Hardware structure)

[0156] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented by a single device physically or logically combined, or can be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected with these multiple devices. The functional block can also be implemented by combining the above single device or the above multiple devices with software.

[0157] Here, in terms of functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, conception, expectation, regarded as, broadcasting, notification, communication, forwarding, configuration (setting), reconfiguration (re - setting), allocation, mapping, assignment, etc., but not limited to these. For example, a functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0158] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 6 FIG. is an example of a hardware structure of a base station and a user terminal according to an embodiment. The above - mentioned base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0159] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structures of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figures, or can be configured not to include some of the devices.

[0160] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing can be executed by one processor, or can be executed by two or more processors simultaneously, sequentially, or by other means. Additionally, the processor 1001 can also be implemented by one or more chips.

[0161] Regarding the respective functions in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage device 1003, thereby realizing the functions.

[0162] The processor 1001, for example, operates the operating system to control the entire computer. The processor 1001 can also be composed of a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. can also be implemented by the processor 1001.

[0163] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage device 1003 and the communication device 1004 into the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0164] The memory 1002 can also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), and other appropriate storage media. The memory 1002 can also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

[0165] The storage 1003 can also be a computer-readable recording medium, for example, composed of at least one of a flexible disc, a floppy (registered trademark) disc, an optical disc (such as a compact disc (compact disc read-only memory (CD-ROM)), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 can also be referred to as an auxiliary storage device.

[0166] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, etc., for example. In order to implement at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) can also be physically or logically separated and implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0167] The input device 1005 is an input device that accepts input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., display, speaker, Light Emitting Diode (LED) lamp, etc.). Additionally, the input device 1005 and the output device 1006 may also be integrated (e.g., touch panel).

[0168] In addition, each device such as the processor 1001 and the memory 1002 is connected via a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between each device.

[0169] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and part or all of each functional block may be implemented using this hardware. For example, the processor 1001 may also be implemented using at least one of these hardwares.

[0170] (Variant)

[0171] Furthermore, regarding the terms described in this disclosure and the terms necessary for understanding this disclosure, they may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may also be replaced with each other. Additionally, a signal may also be a message. A Reference Signal can also be abbreviated as RS and may also be referred to as a Pilot, a pilot signal, etc. according to the applied standard. Moreover, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0172] A radio frame may also be constituted by one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be constituted by one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of numerology.

[0173] Here, the parameter set may also refer to communication parameters applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter-receiver in the frequency domain, specific windowing processing performed by the transmitter-receiver in the time domain, etc.

[0174] In the time domain, a time slot may also be composed of one or more symbols (such as orthogonal frequency division multiplexing (OFDM) symbols, single carrier frequency division multiple access (SC-FDMA) symbols, etc.). In addition, a time slot may also be a time unit based on the parameter set.

[0175] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0176] Radio frames, sub-frames, time slots, mini-slots, and symbols all represent time units for transmitting signals. Radio frames, sub-frames, time slots, mini-slots, and symbols may also use their respective other names. In addition, the time units such as frames, sub-frames, time slots, mini-slots, symbols, etc. in the present disclosure may also be replaced with each other.

[0177] For example, a sub-frame may also be referred to as a TTI, multiple consecutive sub-frames may also be referred to as a TTI, and a time slot or a mini-slot may also be referred to as a TTI. That is, at least one of a sub-frame and a TTI may be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (such as 1 - 13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a sub-frame, but as a time slot, a mini-slot, etc.

[0178] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user terminal) in units of TTI. Additionally, the definition of the TTI is not limited to this.

[0179] The TTI can also be the transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also serve as the processing unit for scheduling, link adaptation, etc. Additionally, when the TTI is given, the time interval (e.g., the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped can also be shorter than the TTI.

[0180] Furthermore, when a time slot or a mini - time slot is referred to as the TTI, one or more TTIs (i.e., one or more time slots or one or more mini - time slots) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini - time slot numbers) that make up the minimum time unit of this scheduling can also be controlled.

[0181] A TTI with a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal sub - frame, standard sub - frame, long sub - frame, time slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened sub - frame, short sub - frame, mini - time slot, sub - time slot, time slot, etc.

[0182] In addition, a long TTI (e.g., a normal TTI, sub - frame, etc.) can also be replaced with a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be replaced with a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0183] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more consecutive sub - carriers (sub - carriers) in the frequency domain. The number of sub - carriers included in the RB can be the same regardless of the parameter set, for example, it can be 12. The number of sub - carriers included in the RB can also be determined based on the parameter set.

[0184] In addition, the RB can also include one or more symbols in the time domain, and can also be the length of a time slot, a mini - time slot, a sub - frame, or a TTI. One TTI, one sub - frame, etc. can also be composed of one or more resource blocks respectively.

[0185] In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0186] Furthermore, a resource block may also be composed of one or more Resource Elements (REs). For example, one RE may also be a wireless resource region of a subcarrier and a symbol.

[0187] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the indices of the RBs based on the common reference point of the carrier. The PRB may also be defined in a certain BWP and be additionally numbered within that BWP.

[0188] The BWP may also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may also be set within a carrier.

[0189] At least one of the set BWPs may also be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".

[0190] In addition, the structures such as the above-mentioned radio frames, subframes, time slots, mini time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini time slots included in a time slot, the symbols and the number of RBs included in a time slot or mini time slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0191] Furthermore, the information, parameters, etc. described in the present disclosure may be represented by absolute values, may also be represented by relative values with respect to a specific value, and may also be represented by corresponding other information. For example, a radio resource may also be indicated by a specific index.

[0192] In the present disclosure, the names used for parameters and the like are not restrictive names in all respects. In addition, the mathematical expressions and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names. Therefore, the various names assigned to these various channels and information elements are not restrictive names in all respects.

[0193] The information, signals, etc. described in the present disclosure can also be represented using any one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0194] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer to a lower layer, and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0195] The information, signals, etc. input and output can be stored in a specific location (e.g., a memory), or can be managed using a management table. The information, signals, etc. input and output can be overwritten, updated or appended. The information, signals, etc. output can also be deleted. The information, signals, etc. input can also be sent to other devices.

[0196] The notification of information is not limited to the methods / embodiments described in the present disclosure, and other methods can also be used. For example, the notification of information in the present disclosure can also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0197] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message. For example, it may also be an RRC connection setup message, an RRC connection reconfiguration (RRC connection reset (RRCConnection Reconfiguration)) message, etc. In addition, MAC signaling may also be notified, for example, using a MAC control element (MACControl Element (CE)).

[0198] In addition, the notification of specific information (for example, the notification of "is X") is not limited to explicit notification, and may also be performed implicitly (for example, by not notifying the specific information, or by notifying other information).

[0199] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true / false value (boolean value) represented by true or false, and can also be made by a numerical comparison (for example, comparison with a specific value).

[0200] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, processes, functions, etc.

[0201] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of using at least one of wired technologies (coaxial cable, optical fiber cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.) to send software from a website, server, or other remote source, at least one of these wired technologies and wireless technologies is included in the definition of the transmission medium.

[0202] In the present disclosure, terms such as "system" and "network" can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0203] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0204] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0205] A base station can accommodate one or more (e.g., three) cells. In the case where the base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within this coverage range.

[0206] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal", etc. can be used interchangeably.

[0207] There are also cases where the mobile station is referred to by subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0208] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station can also be a device mounted on a moving body, the moving body itself, etc. The moving body can be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non - humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0209] In addition, the base station in the present disclosure can also be replaced by a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (e.g., it can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various methods / embodiments of the present disclosure can also be applied. In this case, it can also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. can also be replaced by a side channel.

[0210] Similarly, the user terminal in the present disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the above-mentioned user terminal 20.

[0211] In the present disclosure, the actions performed by the base station sometimes may also be performed by its upper node according to the situation. Obviously, in a network including one or more network nodes having base stations, various operations for communication with terminals can be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0212] The various methods / embodiments described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of the various methods / embodiments described in the present disclosure can also be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0213] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG) (where x is, for example, an integer or a decimal), Future Radio Access (FRA), New Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) for application.

[0214] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0215] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not fully define the quantity or order of these elements. These terms can be used in this disclosure as a convenient way to distinguish between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must take precedence over the second element in a certain form.

[0216] The term "determining" used in this disclosure may involve various actions in some cases. For example, "determining" can also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structure), ascertaining, etc. are regarded as performing "determining".

[0217] In addition, "determining" can also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0218] In addition, "determining" can also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is to say, "determining" can also be a case where some actions are regarded as performing "determining".

[0219] In addition, "determining" can also be replaced by "assuming", "expecting", "considering", etc.

[0220] As used in this disclosure, the "maximum transmit power" may refer to the maximum value of the transmit power, or the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0221] As used in this disclosure, terms such as "connected" and "coupled", or all variations thereof, represent all direct or indirect connections or couplings between two or more elements, and can include the case where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access".

[0222] In this disclosure, when two elements are connected, it is possible to consider using one or more wires, cables, printed electrical connections, etc., and electromagnetic energy having wavelengths in the radio frequency domain, microwave region, optical (both visible and invisible) region, etc., as several non-limiting and non-exhaustive examples, and being "connected" or "coupled" to each other.

[0223] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, this term can also mean "A and B are each different from C". Terms such as "separated" and "combined" can be interpreted in the same way as "different".

[0224] When the terms "include", "including", and their variations are used in this disclosure, these terms, like the term "comprising", are of an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean exclusive or.

[0225] In this disclosure, for example, in cases where articles are added through translation such as a, an, and the in English, this disclosure can also include cases where the nouns following these articles are in the plural form.

[0226] As described above, the invention related to the present disclosure has been described in detail. However, for those skilled in the art, the invention related to the present disclosure is obviously not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in the form of amendments and changes without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not carry any restrictive meaning for the invention related to the present disclosure.

Claims

1. A terminal, comprising: a receiving unit that receives high-layer parameters set for each cell group, the high-layer parameters indicating a first ACK / NACK feedback or a second ACK / NACK feedback, the first ACK / NACK feedback being for multiple physical downlink shared channels (PDSCHs) from multiple transmission / reception points (TRPs), and sending a separate hybrid automatic repeat request acknowledgement (HARQ-ACK) for each TRP, and the second ACK / NACK feedback being for sending, to one TRP, a HARQ-ACK corresponding to the multiple PDSCHs from the multiple TRPs; a control unit that, in an active downlink bandwidth part (DL BWP) of a certain serving cell, when no CORESET pool index is provided or the provided CORESET pool index value = 0 for one or more first control resource sets (first CORESETs) and the provided CORESET pool index value = 1 for one or more second CORESETs, and when the second ACK / NACK feedback is indicated for the serving cell by the high-layer parameters, determines, based on the time domain and regardless of the value of the CORESET pool index, an index of a physical downlink control channel (PDCCH) monitoring opportunity associated with the second ACK / NACK feedback, and determines the index of the PDCCH monitoring opportunity in ascending order of the start time of the CORESET associated with the PDCCH monitoring opportunity; and a sending unit that uses a HARQ-ACK codebook determined based on the index to send a HARQ-ACK corresponding to the multiple PDSCHs.

2. A wireless communication method, which is a wireless communication method of a terminal, comprising: Steps of receiving high-layer parameters set by cell group, where the high-layer parameters indicate first ACK / NACK feedback or second ACK / NACK feedback. The first ACK / NACK feedback is for multiple physical downlink shared channels (PDSCHs) from multiple transmission / reception points (TRPs), and a separate hybrid automatic repeat request acknowledgement (HARQ-ACK) is sent to each TRP. The second ACK / NACK feedback is for sending HARQ-ACK corresponding to the multiple PDSCHs from the multiple TRPs to one TRP; In an active downlink bandwidth part (DL BWP) of a certain serving cell, when no CORESET pool index is provided or the value of the provided CORESET pool index = 0 for more than one first control resource set (first CORESET), and the value of the provided CORESET pool index = 1 for more than one second CORESET, and when the second ACK / NACK feedback is indicated for the serving cell by the high-layer parameters, determining the index of the physical downlink control channel (PDCCH) monitoring opportunity associated with the second ACK / NACK feedback based on time domain without relying on the value of the CORESET pool index, and judging the index of the PDCCH monitoring opportunity in ascending order of the start time of the CORESET associated with the PDCCH monitoring opportunity; and Steps of using the HARQ-ACK codebook determined based on the index to send HARQ-ACK corresponding to the multiple PDSCHs.

3. A base station, comprising: A transmitting unit that transmits high-layer parameters set for each cell group, where the high-layer parameters indicate a first ACK / NACK feedback or a second ACK / NACK feedback. The first ACK / NACK feedback is for multiple Physical Downlink Shared Channels (PDSCHs) from multiple Transmission / Reception Points (TRPs), and a separate Hybrid Automatic Repeat request ACKnowledgement (HARQ-ACK) is sent to each TRP. The second ACK / NACK feedback is for sending, to one TRP, the HARQ-ACK corresponding to the multiple PDSCHs from the multiple TRPs; A control unit that assumes, for a terminal, that in an active downlink bandwidth part (DL BWP) of a certain serving cell, when no CORESET pool index is provided or the value of the provided CORESET pool index = 0 for one or more first control resource sets, i.e., first CORESETs (COntrol REsource SETs), and the value of the provided CORESET pool index = 1 for one or more second CORESETs, and when the second ACK / NACK feedback is indicated for the serving cell by the high-layer parameters, the terminal determines, based on the time domain and without relying on the value of the CORESET pool index, the index of the Physical Downlink Control Channel (PDCCH) monitoring opportunity associated with the second ACK / NACK feedback, and judges the index of the PDCCH monitoring opportunity in ascending order of the start time of the CORESET associated with the PDCCH monitoring opportunity; and A receiving unit that receives the HARQ-ACK corresponding to the multiple PDSCHs, which is sent using the HARQ-ACK codebook determined based on the index.

4. A system having a terminal and a base station, characterized in that: The terminal has: a receiving unit, receiving a high-layer parameter set according to a cell group, where the high-layer parameter indicates a first ACK / NACK feedback or a second ACK / NACK feedback, where the first ACK / NACK feedback is for sending a separate Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK) to each downlink shared channel (Physical Downlink Shared Channel (PDSCH)) from multiple transmission / reception points (TRPs), and the second ACK / NACK feedback is for sending a HARQ-ACK corresponding to the multiple PDSCHs from the multiple TRPs to one TRP; a control unit for, in an activated downlink bandwidth part (DL BWP) of a certain serving cell, when no CORESET pool index is provided for one or more first control resource sets (first CORESETs) or a CORESET pool index value = 0 is provided and when a CORESET pool index value = 1 is provided for one or more second CORESETs, and when the second ACK / NACK feedback is indicated for the serving cell by the higher layer parameter, determining an index of a downlink control channel (Physical Downlink Control Channel (PDCCH)) monitoring opportunity associated with the second ACK / NACK feedback based on a time domain, without depending on the value of the CORESET pool index, and determining the index of the PDCCH monitoring opportunity in ascending order of start times of the CORESETs associated with the PDCCH monitoring opportunity; and a transmitting unit, configured to transmit HARQ-ACKs corresponding to the plurality of PDSCHs using a HARQ-ACK codebook determined based on the index; The base station has: A sending unit, sending the high-level parameters; a control unit, assuming that the terminal determines the index of the PDCCH monitoring opportunity based on the time domain without relying on the value of the CORESET pool index, and determines the index of the PDCCH monitoring opportunity in ascending order of the start time of the ORESET associated with the PDCCH monitoring opportunity; and A receiving unit receives HARQ-ACK corresponding to the multiple PDSCHs.

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