Terminal, wireless communication method and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a receiving unit that attempts to receive a repeatedly transmitted PDSCH in multiple downlink shared channel receiving opportunities that do not overlap in time, that is, multiple PDSCH receiving opportunities; and a control unit that determines that a position of a type 1 hybrid automatic repeat request acknowledgment codebook corresponding to the multiple PDSCH receiving opportunities based on one DCI format, that is, a type 1 HARQ-ACK codebook, corresponds to a position for first PDSCH reception, and determines to include a HARQ-ACK corresponding to at least one of the multiple PDSCH transmission opportunities in the position, when a time division multiplexing scheme A, that is, a TDM scheme A, is set in a high-layer parameter related to activation of a repeated transmission scheme of a PDSCH, a demodulation reference signal port, that is, a DMRS port, is specified in a code division multiplexing group, that is, a CDM group, in the "antenna port" of the downlink control information field, and two TCI states are specified by the "transmission configuration indication", that is, "TCI" of the DCI field. According to one embodiment of the present disclosure, even when repeated transmission of a PDSCH is used, the HARQ-ACK codebook can be appropriately determined.

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 the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (also known as, for example, 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[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 Rel.15NR, a user terminal (user terminal, User Equipment (UE)) may also send HARQ-ACK feedback in units of a HARQ-ACK codebook consisting of bits of one or more delivery confirmation information (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK))).

[0009] However, in Rel.16NR, the repeated transmission of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)) is being studied. However, how the UE constructs and reports the HARQ-ACK for the repeated transmission of PDSCH has not yet been studied. If this is not clearly defined, appropriate HARQ control cannot be performed, and there is a concern that communication throughput will deteriorate.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately determine a HARQ-ACK codebook even when using repeated transmission of a PDSCH.

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure comprises: a receiving unit, which attempts to receive a repeatedly transmitted PDSCH in multiple downlink shared channel receiving opportunities, i.e., multiple PDSCH receiving opportunities, which do not overlap in time; and a control unit, which determines that a position of a type 1 hybrid automatic repeat request acknowledgment codebook, i.e., a type 1 HARQ-ACK codebook corresponding to the multiple PDSCH receiving opportunities based on a DCI format is equivalent to a position for the first PDSCH reception, and decides to include a HARQ-ACK corresponding to at least one of the multiple PDSCH transmission opportunities in the position when a time division multiplexing scheme A, i.e., a TDM scheme A, is set in the high-level parameters related to the activation of the repeated transmission scheme of the PDSCH, a demodulation reference signal port, i.e., a DMRS port, is specified in the "antenna port" of the downlink control information field, and two TCI states are specified through the "transmission setting indication", i.e., "TCI" of the DCI field.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, even when repeated transmission of the PDSCH is used, it is possible to appropriately determine the HARQ-ACK codebook. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A-Figure 1C This is a diagram showing an example of generation of the type 1 HARQ-ACK codebook of Rel.15NR.

[0016] Figure 2 This is a diagram showing an example of repeated transmission of PDSCH in Rel.16NR.

[0017] Figure 3A-3C This is a diagram showing an example of the position of HARQ-ACK for repeated transmission in TDM scheme A according to one embodiment.

[0018] Figure 4 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0019] Figure 5 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0020] Figure 6 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0021] Figure 7 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0022] (HARQ-ACK codebook)

[0023] The UE may also send HARQ-ACK feedback using one PUCCH resource in units of a HARQ-ACK codebook consisting of one or more bits of delivery confirmation information (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)). HARQ-ACK bits may also be referred to as HARQ-ACK information, HARQ-ACK information bits, etc.

[0024] Here, the HARQ-ACK codebook may also include bits for HARQ-ACK in units of at least one of a time domain (e.g., time slot), a frequency domain (e.g., a component carrier (CC)), a spatial domain (e.g., a layer), a transport block (TB), and a code block group (CBG) constituting a TB. The HARQ-ACK codebook may also be referred to as a codebook.

[0025] In addition, the number of bits (size) included in the HARQ-ACK codebook may also be semi-statically or dynamically determined. The HARQ-ACK codebook whose size is semi-statically determined 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 dynamically determined is also referred to as a dynamic HARQ-ACK codebook, a type 2 HARQ-ACK codebook, etc.

[0026] Regarding which type 1 HARQ-ACK codebook or type 2 HARQ-ACK codebook to use, it can also be configured to the UE using a higher layer parameter (for example, pdsch-HARQ-ACK-Codebook).

[0027] In the case of type 1 HARQ-ACK codebook, the UE may also feed back HARQ-ACK bits for PDSCH candidates (or PDSCH opportunities) corresponding to a certain range (for example, a range set based on higher-layer parameters), regardless of whether PDSCH is scheduled or not.

[0028] The range can also be determined based on at least one of a certain period (for example, a set of a specific number of opportunities (occasions) for becoming candidate PDSCH receptions, or a specific number of monitoring occasions (monitoring occasions) of a downlink control channel (Physical Downlink Control Channel (PDCCH))), the number of CCs set or activated for the UE, the number of TBs (number of layers or rank), the number of CBGs per 1TB, and the presence or absence of spatial bundling. The specific range is also referred to as a HARQ-ACK window, a HARQ-ACK bundling window, a HARQ-ACK feedback window, etc.

[0029] In the type 1 HARQ-ACK codebook, if it is within a specific range, even if there is no PDSCH scheduled for the UE, the UE ensures the HARQ-ACK bit for the PDSCH in the codebook. If the UE determines that the PDSCH is not actually scheduled, it can feedback the bit as a NACK bit.

[0030] On the other hand, in the case of type 2 HARQ-ACK codebook, the UE may also feed back HARQ-ACK bits for the scheduled PDSCH within the above-mentioned specific range.

[0031] In Rel.15NR, the UE determines the HARQ-ACK codebook for the PDSCH of one or more time slots to be sent using a certain PUCCH based on the value of the HARQ-ACK timing.

[0032] The transmission timing of HARQ-ACK for dynamic PDSCH (also referred to as PDSCH-to-HARQ feedback timing, K1, etc.) can also be indicated by the PDSCH-to-HARQ feedback timing indicator field included in the DCI (e.g., DCI format 1_0 / 1_1) that schedules the dynamic PDSCH. If the last time slot in which a certain PDSCH is received is set to n, the UE sends the HARQ-ACK corresponding to the PDSCH in the n+K1 time slot.

[0033] The UE may also determine the size of the window (also referred to as the HARQ-ACK window) of the semi-static HARQ-ACK codebook sent in the PUCCH of a certain time slot based on the number of time slots having the same value of n+K1.

[0034] Next, for each slot corresponding to the HARQ-ACK window, the UE determines a candidate PDSCH reception opportunity (also referred to as a candidate PDSCH opportunity, or simply referred to as an opportunity). In addition, a candidate PDSCH opportunity overlapping with a UL symbol is excluded from the objects of the semi-static HARQ-ACK codebook.

[0035] Figure 1A-Figure 1C This is a diagram showing an example of generation of the type 1 HARQ-ACK codebook of Rel.15NR. Figure 1A This is a diagram showing an example of a list related to time domain resource allocation for PDSCH that is configured in the UE or specified in the specification. The row index r of the diagram corresponds to the value of the time domain resource allocation field included in the DCI.

[0036] K0 indicates the number of symbols from PDCCH (DCI) reception to PDSCH reception. Start indicates the index S of the start symbol in the time slot of PDSCH. Length indicates the length (number of symbols) of PDSCH. Mapping Type indicates the resource allocation type (A or B) of PDSCH.

[0037] Figure 1B Representation and Figure 1A For example, the candidate PDSCH opportunity corresponding to r=0 corresponds to a period of 4 symbols starting from symbol #2.

[0038] The UE excludes candidate PDSCH opportunities that overlap with UL symbols (e.g., symbols set as UL by higher layer parameters). In this example, the last two symbols of the time slot are UL symbols, so candidate PDSCH opportunities corresponding to r=2, 3, and 8 are excluded. Figure 1B r={0, 1, 4, 5, 6, 7} corresponds to j={0, 1, 0, 1, 2, 3} respectively. Here, j is an index indicating the bit number of the transmitted HARQ-ACK codebook.

[0039] For overlapping candidate PDSCH opportunities, the UE follows specific rules and can only generate one HARQ-ACK bit. Therefore, the set of candidate PDSCH opportunities M can be obtained. A，c ={0, 1, 2, 3}.

[0040] Finally, the UE can also A，c The number of elements (also called concentration (cardinality)) determines the number of HARQ-ACK bits. Figure 1C is shown with Figure 1B A diagram of the bits of the corresponding HARQ-ACK codebook. Figure 1C In the figure, it is shown that from o0 ACK To o3 ACK In addition, in this specification, for simplicity, it will be added to o k ACK The wavy line (-) on "o" in (k is an integer) is omitted and described, but it can be replaced with the symbols with wavy lines as shown in the drawings.

[0041] The HARQ-ACK bits based on the TB are arranged in the order of earlier (smaller) CC index and earlier (smaller) PDCCH monitoring period. That is, Figure 1C o0 ACK To o3 ACK It can also be combined with the above M A，c ={0, 1, 2, 3} respectively.

[0042] in addition, Figure 1C Shown only with Figure 1B However, when HARQ-ACK codebooks corresponding to PDSCHs of multiple time slots are sent in the same time slot, the number of bits of the HARQ-ACK codebook may also be the same as Figure 1C different.

[0043] (Repeated transmission of PDSCH)

[0044] In Rel.16NR, repeated transmission of PDSCH is being studied. For example, for PDSCH transmission using multiple transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) or multiple panels (multi-panel), repeated transmission of PDSCH as described above can be performed.

[0045] The UE may also be set with at least one of frequency division multiplexing (FDM) scheme A ('FDMSchemeA'), FDM scheme B ('FDMSchemeB'), time division multiplexing (TDM) scheme A ('TDMSchemeA'), etc. as the value of a high-level parameter (RepSchemeEnabler) related to the activation of the repeated transmission scheme of PDSCH.

[0046] In addition, when two TCI states are specified in the code point of the transmission configuration indication (TCI) field of the DCI for a UE configured with TDM scheme A, two PDSCH transmission opportunities of the same TB are received with each TCI state associated with the PDSCH transmission opportunity. Here, one of the two PDSCH transmission opportunities has a time domain resource allocation that does not overlap with the other. In addition, both of the two PDSCH transmission opportunities are received within a certain time slot.

[0047] It is expected that a UE set with TDM scheme A and assigned two TCI states receives two PDSCH transmission opportunities. Here, of the two TCI states, the first TCI state is applied to the first PDSCH transmission opportunity, and the second TCI state is applied to the second PDSCH transmission opportunity. These two PDSCH transmission opportunities are equivalent to repeated transmissions of TDM scheme A.

[0048] The time domain resource allocation for the first PDSCH transmission opportunity may also be determined according to the time domain resource allocation field of the DCI. The time domain resource allocation for the second PDSCH transmission opportunity may also have the same number of symbols as that of the first PDSCH transmission opportunity.

[0049] The UE may also determine that the first symbol of the second PDSCH transmission opportunity starts after a certain number of symbols from the last symbol of the first PDSCH transmission opportunity. The certain number of symbols may also be provided by a higher layer parameter (StartingSymbolOffsetK), and may be assumed to be 0 by the UE if the higher layer parameter is not provided.

[0050] The UE may also not be expected to receive more than two PDSCH transmission layers for each PDSCH transmission opportunity.

[0051] Figure 2 This is a diagram showing an example of repeated transmission of PDSCH in Rel.16NR. In this example, a UE configured with TDM scheme A receives a DCI that schedules repeated transmission of PDSCH (PDSCH#1, #2) in a certain time slot, and receives these PDSCHs in accordance with the DCI. PDSCH#1 and #2 may also be the same TB. In addition, in this example, the StartingSymbolOffsetK is not provided to the UE, and transmission of PDSCH#2 starts from the symbol immediately following PDSCH#1.

[0052] However, no research has been conducted on how to construct and report HARQ-ACK for repeated transmission of PDSCH by a UE configured with TDM scheme A and assigned two TCI states through DCI. If this cannot be clearly defined, appropriate HARQ control cannot be performed, and there is a concern that communication throughput may deteriorate.

[0053] Therefore, the inventors of the present invention have conceived a method for appropriately performing HARQ-ACK feedback even when repeated transmission of the PDSCH is utilized.

[0054] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0055] In the following embodiments, it is assumed that the UE uses Figure 1A The list of time domain resource allocation for PDSCH shown in Figure 1B In addition, it is assumed that in the repeated transmission of TDM scheme A, the first PDSCH transmission opportunity corresponds to the time domain resource allocation with row index r=0, and the second PDSCH transmission opportunity completely overlaps with the time domain resource allocation with row index r=1.

[0056] In addition, these assumptions are for convenience of explanation, and those skilled in the art will naturally understand that the content of the present disclosure is not limited to the cases of these assumptions.

[0057] In addition, in the present disclosure, generation, determination, transmission, reporting, etc. of HARQ-ACK (or HARQ-ACK codebook) may also be mutually interchangeable. In addition, in the present disclosure, (candidate) PDSCH transmission opportunity, (candidate) PDSCH reception opportunity, (candidate) PDSCH opportunity may also be mutually interchangeable.

[0058] In addition, in the present disclosure, the repeated transmission of TDM scheme A is described as two repetitions (the first PDSCH transmission opportunity and the second PDSCH transmission opportunity), but in each embodiment, it can also be replaced with n (n is an integer) repetitions. In this case, the value "2" can also be appropriately replaced with "n".

[0059] In the present disclosure, the panel, uplink (UL) transmission entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (for example, demodulation reference signal (DeModulation Reference Signal (DMRS or DM-RS)) port), antenna port group of a certain signal (for example, DMRS port group), group for multiplexing (for example, code division multiplexing (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 indicator (Identifier) ​​(ID) can also be replaced with the panel. In the present disclosure, TRP ID and TRP can also be replaced with each other.

[0060] In the present disclosure, index, ID, indicator, resource ID, etc. may also be interchangeable.

[0061] (Wireless Communication Method)

[0062] One embodiment relates to the position (bit position) of HARQ-ACK for repeated transmission (repeated PDSCH) of TDM scheme A in a semi-static codebook.

[0063] The UE may also determine the position of the repeatedly transmitted HARQ-ACK for TDM scheme A based on any of the following:

[0064] Only the first PDSCH transmission opportunity (implementation 1-1),

[0065] Only the second PDSCH transmission opportunity (implementation 1-2),

[0066] · Both the first PDSCH transmission opportunity and the second PDSCH transmission opportunity (Embodiment 1-3).

[0067] In one embodiment, for a set of slot timing values ​​K1, the UE determines the M for candidate PDSCH opportunities or semi-persistent scheduling (SPS) PDSCH release. A，c A collection of opportunities.

[0068] In one embodiment, when a UE is configured by the higher layer parameter RepSchemeEnabler setto'TDMSchemeA'and indicated DM-RS port(s)within one CDM group in the DCI field "Antenna Port(s)", and if two TCI states are indicated by the DCI field 'Transmission Configuration Indication', a location in the Type-1 HARQ-ACK codebook for HARQ-ACK information corresponding to two PDSCH reception occasions based on one DCI format is the same as the location for the first PDSCH reception ("When a UE is configured by the higher layer parameter RepSchemeEnabler setto'TDMSchemeA'and indicated DM-RS port(s)within one CDM group in the DCI field "Antenna Port(s)", and if two TCI states are indicated by the DCI field 'Transmission Configuration Indication', a location in the Type-1 HARQ-ACK codebook for HARQ-ACK information corresponding to two PDSCH reception occasions based on one DCI format is the same as the location for the first PDSCH reception. by a single DCI format is the same as for the first PDSCH reception").

[0069] In addition, the "position for the first PDSCH reception" here may also mean the position for the first PDSCH reception opportunity. In addition, the "position for the first PDSCH reception" may also be replaced with the position for the second PDSCH reception, the position for the last PDSCH reception, the position for a specific (e.g., nth) PDSCH reception, etc. In addition, the "one position" here may also be replaced with multiple positions, in which case the "position for the first PDSCH reception" may also be replaced with the position for the first PDSCH reception and the position for the second PDSCH reception, etc.

[0070] [TB-based repeated transmission]

[0071] The UE may also generate only 1-bit HARQ-ACK for repeated transmission of TDM scheme A. In other words, 1-bit HARQ-ACK may also be generated for each TB of TDM scheme A. In this case, the UE may determine the position of the HARQ-ACK for repeated transmission of TDM scheme A based only on the first PDSCH transmission opportunity, or may determine the position of the HARQ-ACK for repeated transmission of TDM scheme A based only on the second PDSCH transmission opportunity.

[0072] The UE may also generate a 2-bit HARQ-ACK for repeated transmission of TDM scheme A. In other words, a 2-bit HARQ-ACK may also be generated for each TB of TDM scheme A. In this case, the UE may also determine the position of the HARQ-ACK for repeated transmission of TDM scheme A based on both the first PDSCH transmission opportunity and the second PDSCH transmission opportunity.

[0073] Figure 3A-3C This is a diagram showing an example of the position of HARQ-ACK for repeated transmission in TDM scheme A according to one embodiment.

[0074] Figure 3A An example is shown in which the position of the HARQ-ACK is determined based only on the first PDSCH transmission opportunity (the above-mentioned embodiment 1-1). In this example, the position of the HARQ-ACK is the same as the first PDSCH transmission opportunity M. A，c =0 (r=0) corresponds to position o0 ACK At this time, o1 ACK It can also be used to indicate M that is not related to the repeated transmission of TDM scheme A. A，c =1(r=1)corresponding to the HARQ-ACK.

[0075] Figure 3BAn example is shown in which the position of the HARQ-ACK is determined based only on the second PDSCH transmission opportunity (the above-mentioned embodiment 1-2). In this example, the position of the HARQ-ACK is equal to the second PDSCH transmission opportunity M. A，c =1(r=1) corresponds to position o1 ACK At this time, o0 ACK It can also be used to indicate M that is not related to the repeated transmission of TDM scheme A. A，c =0(r=0)corresponding to the HARQ-ACK.

[0076] Figure 3C An example is shown in which the position of the HARQ-ACK is determined based on both the first PDSCH transmission opportunity and the second PDSCH transmission opportunity (the above-mentioned embodiments 1-3). In this example, the position of the HARQ-ACK includes the first PDSCH transmission opportunity M A，c =0 (r=0) corresponds to position o0 ACK , and the second PDSCH transmission opportunity M A，c =1(r=1) corresponds to position o1 ACK .

[0077] Without being provided with high-level parameters (PDSCHCodeBlockGroupTransmission) related to CBG transmission for PDSCH, the UE can also follow at least one of the above-mentioned implementation modes 1-1 to 1-3 for repeated transmission of TDM scheme A, generate one or two HARQ-ACK bits for each 1TB, and determine the position of the HARQ-ACK based on one or both of the first PDSCH transmission opportunity and the second PDSCH transmission opportunity.

[0078] [Repeated sending based on CBG]

[0079] In the case where the UE is not provided with the high-level parameters (PDSCHCodeBlockGroupTransmission) related to the CBG transmission for the PDSCH, the UE may also replace one HARQ-ACK bit per 1TB with N bits for the repeated transmission of TDM scheme A in accordance with the description related to the above-mentioned embodiments 1-1 to 1-3. CBG / TB、max HARQ-ACK、c The HARQ-ACK codebook is determined by the content of the HARQ-ACK bits. CBG / TB、max HARQ-ACK、c It can be equivalent to the maximum number of CBGs per TB, for example, it can also be set by the high-level parameter maxCodeBlockGroupsPerTransportBlock.

[0080] In the case of repeated transmission based on CBG of TDM scheme A, the UE may also receive N PDSCHs in each PDSCH transmission opportunity included in the repeated transmission. CBG / TB、max HARQ-ACK、c CBG. That is, the above N CBG / TB、max HARQ-ACK、c The HARQ-ACK bits may also correspond to the HARQ-ACKs for different CBGs within a TB, respectively.

[0081] In addition, in the present disclosure, CBG can also be replaced by Code Block (CB).

[0082] According to the above-described embodiment, the UE can appropriately determine the position of the HARQ-ACK for repeated transmission of TDM scheme A and generate a type 1 HARQ-ACK codebook. If the base station understands this structure, there will be no inconsistency in the codebook between the UE and the base station, and the transmission and reception processing can be appropriately controlled.

[0083] <Other>

[0084] The above-mentioned embodiments are described on the premise that they are applied when a semi-static codebook (type 1 HARQ-ACK codebook) is configured for the UE, but they can also be applied when a dynamic codebook (type 2 HARQ-ACK codebook) is configured for the UE.

[0085] In addition, the above-mentioned embodiments can be applied when multiple TRPs or multiple panels (operation) are set in the UE, and can also be applied when not so.

[0086] (Wireless Communication System)

[0087] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0088] Figure 41 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0089] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0090] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (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.

[0091] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0092] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in 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 in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0093] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0094] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the 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 below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0095] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0096] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0097] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0098] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0099] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the 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. may be used.

[0100] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0101] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0102] In addition, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like can also be used in the wireless communication system 1.

[0103] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0104] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0105] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0106] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0107] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0108] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0109] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0110] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0111] The synchronization signal may 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 SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0112] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0113] (Base Station)

[0114] Figure 5 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0115] In addition, in this example, the functional blocks of the characteristic parts in 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 also be omitted.

[0116] 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 common knowledge in the technical field to which the present disclosure relates.

[0117] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0118] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0119] 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.

[0120] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0121] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0122] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0123] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0124] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0125] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0126] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0127] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0128] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0129] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0130] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0131] Alternatively, the transmitting / receiving unit 120 may repeatedly transmit the PDSCH in a plurality of downlink shared channels (Physical Downlink Shared Channel (PDSCH)) transmission opportunities that do not overlap in time.

[0132] The control unit 110 may also receive a type 1 hybrid automatic repeat request confirmation codebook, i.e., a type 1 HARQ-ACK codebook, wherein the type 1 HARQ-ACK codebook is a HARQ-ACK codebook formed by including a HARQ-ACK corresponding to at least one of the multiple PDSCH transmission opportunities in a position corresponding to the type 1 HARQ-ACK codebook corresponding to the multiple PDSCH reception opportunities based on a DCI format determined by the user terminal 20 to be equivalent to a position for first PDSCH reception, and wherein the user terminal 20 is set with a time division multiplexing scheme A, i.e., a TDM scheme A, in a high-layer parameter related to activation of a repeated transmission scheme of the PDSCH, a demodulation reference signal port, i.e., a DMRS port, within a code division multiplexing group, i.e., a CDM group, in the "antenna port" of the downlink control information field, and two TCI states are specified through the "transmission setting indication", i.e., "TCI", of the DCI field.

[0133] (User Terminal)

[0134] Figure 6 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0135] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0136] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0137] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0138] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0139] The transmitting and receiving unit 220 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 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0140] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0141] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0142] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0143] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0144] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0145] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0146] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0147] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0148] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0149] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0150] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 , the transmitting and receiving antenna 230 , and the transmission path interface 240 .

[0151] Furthermore, the transmitting / receiving unit 220 may attempt to receive a repeatedly transmitted downlink shared channel (Physical Downlink Shared Channel (PDSCH)) in a plurality of downlink shared channel reception opportunities that do not overlap in time.

[0152] The control unit 210 may also determine that a position of a type 1 hybrid automatic repeat request acknowledgment codebook, i.e., type 1 HARQ-ACK codebook corresponding to the multiple PDSCH receiving opportunities based on one DCI format is equivalent to a position for the first PDSCH reception when a time division multiplexing scheme A, i.e., TDM scheme A, is set in the high-level parameters related to the activation of the repeated transmission scheme of the PDSCH, a demodulation reference signal port, i.e., DMRS port, is specified in the "antenna port" of the downlink control information field, and two TCI states are specified through the "transmission setting indication", i.e., "TCI" of the DCI field. The control unit 210 may also determine that a position of a type 1 hybrid automatic repeat request acknowledgment codebook, i.e., type 1 HARQ-ACK codebook, corresponding to the multiple PDSCH receiving opportunities based on one DCI format is equivalent to a position for the first PDSCH reception, and decide to include a HARQ-ACK corresponding to at least one of the multiple PDSCH transmission opportunities in the position.

[0153] The transmitting and receiving unit 220 may also transmit, to the base station 10 , a type 1 HARQ-ACK codebook (semi-static HARQ-ACK codebook) including a HARQ-ACK corresponding to at least one of the plurality of PDSCH transmission opportunities at the position.

[0154] (Hardware Structure)

[0155] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0156] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending 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.

[0157] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0158] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0159] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0160] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations 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 1003.

[0161] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0162] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned 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 operated in the processor 1001, and the same can be implemented for other functional blocks.

[0163] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0164] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0165] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0166] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0167] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0168] 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 the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0169] (Variation Example)

[0170] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0171] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0172] Here, the parameter set may also be a communication parameter 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 a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0173] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0174] A time slot may also include 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 fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0175] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0176] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0177] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0178] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0179] In addition, when a time slot or a mini time slot is called 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 of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0180] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0181] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0182] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0183] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0184] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0185] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0186] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs may also be identified by the index of the RB relative to the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0187] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0188] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0189] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only 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 number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0190] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0191] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may 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, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0192] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0193] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0194] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0195] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-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.

[0196] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (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, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0197] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0198] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0199] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0200] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0201] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0202] 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", and "panel" can be used interchangeably.

[0203] 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", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0204] A base station can accommodate one or more (for example, three) cells. When a 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 (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0205] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0206] There are also cases where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless 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 some other appropriate terminology.

[0207] At least one of the base station and the mobile station may 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 may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0208] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0209] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0210] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0211] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0212] The various modes / implementations described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG)) (xG (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, and next-generation systems expanded based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0213] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0214] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0215] The term "determining" used in this disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0216] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0217] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0218] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0219] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0220] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be replaced by "access".

[0221] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0222] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0223] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0224] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0225] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode 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 the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: a receiving unit that attempts to receive a repeatedly transmitted PDSCH in a plurality of downlink shared channel PDSCH transmission opportunities that do not overlap in time; and A control unit, when time division multiplexing TDM scheme A is set in the high-level parameters related to the activation of the repeated transmission scheme of PDSCH, a demodulation reference signal DMRS port in a code division multiplexing CDM group is specified in the "antenna port" of the downlink control information field, and two TCI states are specified through the "transmission setting indication TCI" of the DCI field, determines that a position of the type 1 hybrid automatic repeat request confirmation HARQ-ACK codebook corresponding to the multiple PDSCH transmission opportunities based on one DCI format is equivalent to the position for the first PDSCH reception, and decides to include the HARQ-ACK corresponding to at least one of the multiple PDSCH transmission opportunities in the said position.

2. A wireless communication method of a terminal, comprising: The step of attempting to receive a repeatedly transmitted PDSCH in a plurality of downlink shared channel PDSCH transmission opportunities that do not overlap in time; and In a case where time division multiplexing TDM scheme A is set in the high-level parameters related to the activation of the repeated transmission scheme of PDSCH, a demodulation reference signal DMRS port within a code division multiplexing CDM group is specified in the "antenna port" of the downlink control information field, and two TCI states are specified through the "transmission setting indication TCI" of the DCI field, it is determined that a position of the type 1 hybrid automatic repeat request confirmation HARQ-ACK codebook corresponding to the multiple PDSCH transmission opportunities based on one DCI format is equivalent to the position for the first PDSCH reception, and a step is determined to include the HARQ-ACK corresponding to at least one of the multiple PDSCH transmission opportunities in the position.

3. A base station, comprising: A transmitting unit, which repeatedly transmits a PDSCH in a plurality of downlink shared channel PDSCH transmission opportunities which do not overlap in time; and A receiving unit receives a type 1 hybrid automatic repeat request confirmation HARQ-ACK codebook, wherein the type 1 HARQ-ACK codebook is a HARQ-ACK codebook formed by including a HARQ-ACK corresponding to at least one of the multiple PDSCH transmission opportunities in a position corresponding to the type 1 HARQ-ACK codebook corresponding to the multiple PDSCH transmission opportunities based on a DCI format by a terminal, and the position is determined to be equivalent to the position for first PDSCH reception, and the terminal is set to a time division multiplexing TDM scheme A in a high-layer parameter related to the activation of a repeated transmission scheme of the PDSCH, a demodulation reference signal DMRS port in a code division multiplexing CDM group is specified in the "antenna port" of the downlink control information field, and two TCI states are specified through the "transmission setting indication TCI" of the DCI field.

4. A system having a terminal and a base station, The terminal has: a receiving unit that attempts to receive a repeatedly transmitted PDSCH in a plurality of downlink shared channel PDSCH transmission opportunities that do not overlap in time; and A control unit, when a time division multiplexing (TDM) scheme A is set in a high-layer parameter related to activation of a repeated transmission scheme of a PDSCH, a demodulation reference signal (DMRS) port in a code division multiplexing (CDM) group is specified in an "antenna port" of a downlink control information field, and two TCI states are specified by a "transmission configuration indication (TCI)" of a DCI field, determines that a position of a type 1 hybrid automatic repeat request confirmation (HARQ-ACK) codebook corresponding to the plurality of PDSCH transmission opportunities based on one DCI format is equivalent to a position for first PDSCH reception, and decides to include a HARQ-ACK corresponding to at least one of the plurality of PDSCH transmission opportunities in the position, The base station has: a transmitting unit, configured to repeatedly transmit the PDSCH in the plurality of PDSCH transmission opportunities, A receiving unit receives the type 1 HARQ-ACK codebook.

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