Terminal and wireless communication method

Abstract

This terminal includes: a transmission unit that transmits an uplink control signal including a first confirmation response to a first downlink signal; a reception unit that receives a downlink control signal which triggers retransmission of the first confirmation response; a control unit that controls retransmission of the first confirmation response, with respect to the relationship of a second confirmation response to a second downlink signal.

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a wireless communication method. [Background technology]

[0002] Long Term Evolution (LTE) has been specified for Universal Mobile Telecommunication System (UMTS) networks to achieve higher data rates and lower latency. Furthermore, successor systems to LTE are also being considered to achieve even greater bandwidth and speed than LTE. Examples of successor systems to LTE include LTE-Advanced (LTE-A), Future Radio Access (FRA), 5th generation mobile communication system (5G), 5G plus (5G+), Radio Access Technology (New-RAT), and New Radio (NR).

[0003] For example, in NR, strengthening the feedback function from a terminal to a base station is being considered in order to improve communication quality (for example, Non-Patent Document 1).

[0004] Information fed back from a terminal to a base station is transmitted in resources of the Physical Uplink Control Channel (PUCCH). Regarding the extension of the Ultra-Reliable and Low Latency Communications (URLLC) technology in 3GPP Rel. 17, a method for configuring resources for transmitting uplink control signals including feedback information is being considered. Also, 3GPP Rel. 17 agreed to support one-shot triggering HARQ-ACK retransmission. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Enhanced Industrial Internet of Things(IoT) and ultra-reliable and low latency communication",RP-201310,3GPP TSG RAN Meeting #86e,3GPP, July 2020 Summary of the Invention

[0006] The details of the control of the HARQ-ACK bit based on one-shot triggering HARQ-ACK retransmission, taking into account the relationship with other HARQ-ACK bits, have not yet been specified and are open to further study.

[0007] One aspect of the present disclosure is to provide a terminal that can appropriately control the HARQ-ACK bit transmitted in a retransmission HARQ-ACK CB based on one-shot triggering HARQ-ACK retransmission, taking into account the relationship with other HARQ-ACK bits. [Means for solving the problem]

[0008] A terminal according to one embodiment of the present disclosure includes a transmitter that transmits an uplink control signal including a first acknowledgment response to a first downlink signal, a receiver that receives a downlink control signal that triggers a retransmission of the first acknowledgment response, and a controller that controls the retransmission of the first acknowledgment response in relation to a second acknowledgment response to a second downlink signal.

[0009] A wireless communication method according to one embodiment of the present disclosure includes a terminal transmitting an uplink control signal including a first acknowledgment response to a first downlink signal, receiving a downlink control signal that triggers a retransmission of the first acknowledgment response, and controlling the retransmission of the first acknowledgment response in relation to a second acknowledgment response to a second downlink signal. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment. [Figure 2] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system when DC (Dual connectivity) is executed. [Figure 3] FIG. 1 is a diagram illustrating an example of a basic operation of a communication system according to an embodiment. [Figure 4] FIG. 10 is a diagram illustrating an example of postponement of SPS HARQ-ACK. [Figure 5] FIG. 1 is a diagram illustrating an overview of Type 1 HARQ-ACK CB. [Figure 6] FIG. 1 is a diagram illustrating an overview of Type 2 HARQ-ACK CB. [Figure 7] FIG. 1 is a diagram illustrating an overview of Type 3 HARQ-ACK CB. [Figure 8] FIG. 10 is a diagram illustrating an example of the relationship between a retransmission HARQ-ACK CB based on one-shot triggering HARQ-ACK retransmission and other HARQ-ACKs. [Figure 9] FIG. 10 is a diagram illustrating an example of selecting a HARQ-ACK bit for a retransmission HARQ-ACK CB in a slot specified by one-shot triggering DCI. [Figure 10] FIG. 10 is a diagram illustrating an example of selecting a HARQ-ACK bit for a retransmission HARQ-ACK CB in a slot specified by one-shot triggering DCI. [Figure 11] FIG. 10 is a diagram illustrating an example of selecting a HARQ-ACK bit for a retransmission HARQ-ACK CB in a slot specified by one-shot triggering DCI. [Figure 12] FIG. 10 is a diagram illustrating an example of selecting a HARQ-ACK bit for a retransmission HARQ-ACK CB in a slot specified by one-shot triggering DCI. [Figure 13] FIG. 2 is a block diagram showing an example of the configuration of a base station according to the present embodiment. [Figure 14] FIG. 2 is a block diagram showing an example of the configuration of a terminal according to the present embodiment. [Figure 15] FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station and a terminal according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment according to one aspect of the present disclosure will be described with reference to the drawings.

[0012] (Embodiment) NR specifies downlink semi-persistent scheduling (SPS), in which PDSCH (Physical Downlink Shared Channel) resources are configured in advance in terminals and activation / release is performed using DCI (Downlink Control Information). SPS enables low-latency data reception.

[0013] When an uplink (UL) slot is placed after multiple consecutive downlink (DL) slots, the terminal may transmit an acknowledgement (e.g., a Hybrid Automatic Repeat request - Acknowledgement (HARQ-ACK)) corresponding to the reception of multiple data in the DL slot in the UL slot following the DL slot.

[0014] In the following description, a PDSCH based on an SPS may be referred to as an SPS PDSCH, and an acknowledgement response to the SPS PDSCH may be referred to as an SPS HARQ-ACK.

[0015] In this embodiment, a wireless communication system is described as an example, in which operation using SPS is possible, an SPS PDSCH is transmitted from a base station to a terminal, and an uplink control signal (e.g., a PUCCH (Physical Uplink Control Channel) signal) including an SPS HARQ ACK is transmitted from the terminal to the base station.

[0016] (System Configuration) Fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0017] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

[0018] Base station 10 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (component carriers)) to communicate with terminal 20. In carrier aggregation, one PCell (primary cell) and one or more SCells (secondary cells) are used.

[0019] The base station 10 transmits a synchronization signal, system information, and the like to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, on the NR-PBCH or PDSCH, and is also called broadcast information. As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 on the DL (Downlink) and receives control signals or data from the terminal 20 on the UL (Uplink). Note that, here, what is transmitted on a control channel such as the PUCCH or PDCCH is called a control signal, and what is transmitted on a shared channel such as the PUSCH or PDSCH is called data, but these names are merely examples.

[0020] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 may be referred to as a UE, and the base station 10 may be referred to as a gNB.

[0021] Terminal 20 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (component carriers)) to communicate with base station 10. In carrier aggregation, one PCell and one or more SCells are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0022] Fig. 2 shows an example of the configuration of a wireless communication system when DC (Dual Connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0023] A cell group provided by base station 10A, which is an MN, is called an MGC (Master Cell Group), and a cell group provided by base station 10B, which is an SN, is called an SCG (Secondary Cell Group). In addition, in a DC, an MCG is composed of one PCell and one or more SCells, and an SCG is composed of one PSCell (Primary-SCell) and one or more SCells.

[0024] The processing operations in this embodiment may be executed in the system configuration shown in FIG. 1, in the system configuration shown in FIG. 2, or in any other system configuration.

[0025] (Basic operation example) An example of the basic operation of the communication system according to the embodiment of the present invention will be described with reference to FIG.

[0026] In S101, base station 10 transmits downlink SPS configuration information, PUCCH resource configuration information, slot format configuration information, and the like to terminal 20 by RRC (Radio Resource Control) signaling, and terminal 20 receives this configuration information. Note that this embodiment targets downlink SPS, and therefore hereinafter, "SPS" means downlink SPS.

[0027] The slot format configuration information is, for example, tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated, and this configuration information determines whether the TDD configuration for each symbol in each slot of one or more slots is downlink, uplink, or flexible. Hereinafter, this configuration information will be referred to as semi-static TDD configuration information. Downlink will sometimes be referred to as "D," uplink as "U," and flexible as "F." Terminal 20 basically determines D / U / F for each symbol in each slot according to the semi-static TDD configuration information.

[0028] In addition, multiple slot format candidates may be notified as the setting information in S101 to enable dynamic switching of the slot format. This setting information is, for example, SlotFormatCombinationPerCell. Since this information is information consisting of slot format (SF) IDs, this information will be referred to as SFI setting information hereinafter.

[0029] In S102, terminal 20 receives DCI activating the SPS configuration from base station 10, and in S103 receives data in the PDSCH resource according to the SPS configuration. In S104, terminal 20 transmits an SPS HARQ-ACK to base station 10 in the PUCCH resource (or PUSCH resource if UL scheduling is present) of the slot at the time position specified by the DCI. Note that, hereinafter, the SPS HARQ-ACK may be simply referred to as "HARQ-ACK." The HARQ-ACK may also be referred to as HARQ information, feedback information, etc.

[0030] The terminal 20 may receive DCI from the base station 10 at or before or after S102, which dynamically specifies a slot format. This DCI is control information that specifies the ID to be actually used among the IDs of multiple slot formats set by the SFI setting information. When a slot format is specified by this DCI, the terminal 20 determines D / U / F of each symbol in each slot according to the slot format instead of the semi-static TDD setting information. This DCI information is called dynamic SFI specification information (or dynamic SFI, or SFI).

[0031] When SPS is set, depending on the DL / UL setting of TDD in the slot at the specified time position (set by semi-static TDD setting information or dynamic SFI designation information), the symbol position where the PUCCH resource is set may overlap with other symbols (e.g., semi-static DL symbols), and it is considered that HARQ-ACK cannot be transmitted.

[0032] In 3GPP, in Rel.17, technologies for systems called URLLC and Industrial Internet of Things (IIoT) are being studied.

[0033] In URLLC, enhancements to the terminal feedback function for Hybrid Automatic Repeat request - Acknowledgement (HARQ-ACK) are being studied. HARQ-ACK is an example of information regarding the confirmation response (e.g., acknowledgement) for the data received by the terminal. As an example of the enhancement, the above-mentioned SPS HARQ-ACK deferring is being studied.

[0034] <SPS HARQ-ACK deferring> In 3GPP, in Rel-17, it was agreed to support SPS HARQ-ACK deferring. Also, in 3GPP, the following points were agreed regarding SPS HARQ-ACK deferring.

[0035] When the PUCCH using "SPS-PUCCH-AN-List-r16" or "n1PUCCH-AN" overlaps with semi-static DL or SSB symbols, the SPS HARQ-ACK PUCCH (transmission of SPS HARQ-ACK) may be deferred.

[0036] Note that "SPS-PUCCH-AN-List-r16" is included in information (for example, PUCCH-Config) that sets PUCCH resource parameters for a terminal. "SPS-PUCCH-AN-List-r16" is an example of information that indicates a list of PUCCH resources for DL ​​SPS HRQ-ACK. Also, "n1PUCCH-AN" is included in information (for example, SPS-Config) that is used to set DL semi-persistent transmission. "n1PUCCH-AN" is an example of information that indicates PUCCH HARQ resources for DL ​​SPS.

[0037] The postponement of the SPS HARQ-ACK may be configured for each SPS configuration. The HARQ-ACK for an SPS PDSCH configuration that can be postponed may be postponed.

[0038] A maximum deferral limitation may be set for each SPS configuration. For example, a condition may be set that "K1_max_def=K1+K_def" does not exceed a limit (e.g., maximum deferral limitation).

[0039] The slot in which the deferred SPS HARQ-ACK may be transmitted is referred to as the target slot or the target PUCCH slot.

[0040] For example, the target slot may be the first available slot in which the determined PUCCH resource does not overlap with invalid symbols (e.g., semi-static DL or SSB symbols). The determined PUCCH resource may correspond to the PUCCH resource used for transmitting the postponed SPS HARQ-ACK. The first available slot may also be the earliest slot in the time direction.

[0041] The target slot may be determined taking into consideration the multiplexing of SPS HARQ-ACK and dynamic HARQ-ACK.

[0042] After determining the target PUCCH slot, if the deferred SPS HARQ-ACK is not transmitted, the transmission of the deferred SPS HARQ-ACK bit may not be further deferred, in which case the deferred SPS HARQ-ACK bit may be dropped.

[0043] FIG. 4 is a diagram showing an example of postponement of SPS HARQ-ACK. The horizontal axis of FIG. 4 represents the time axis. Six slots are shown in FIG. 4 as an example. Note that hereinafter, multiple slots may be referred to as the first slot, the second slot, etc., in order from the oldest slot (the left side of the figure). Each of the six slots is marked with "D" or "U." Slots marked with "D" indicate DL slots, and slots marked with "U" indicate UL slots. The first slot includes SPS PDSCH#1 and SPS PDSCH#2, and the second slot includes SPS PDSCH#3.

[0044] Here, for example, a case will be described in which SPS HARQ-ACK postponement is enabled in the SPS settings of SPS PDSCH#1 and SPS PDSCH#3, disabled in the SPS setting of SPS PDSCH#2, and the SPS HARQ-ACK for each SPS PDSCH can be transmitted in the third slot. Note that "the SPS HARQ-ACK can be transmitted in the third slot" may be equivalent to information indicating the transmission slot of the SPS HARQ-ACK indicating transmission in the third slot. In this case, the SPS HARQ-ACK overlaps with the semi-static DL in the third slot, so the SPS HARQ-ACK PUCCH is postponed.

[0045] The slot in which the SPS HARQ-ACK for the SPS PDSCH can be transmitted (the third slot in FIG. 4) is specified by the parameter "K1." K1 indicates the offset from the data (e.g., SPS PDSCH) to the corresponding acknowledgment (e.g., SPS HARQ-ACK). In the case of FIG. 4, K1=2 is set for SPS PDSCH#1 and K1=1 is set for SPS PDSCH#2, indicating the third slot.

[0046] In the example of Figure 4, the fifth slot corresponds to the first available slot (target slot) that does not overlap with an invalid symbol (e.g., a semi-static DL or SSB symbol), so the HARQ-ACK bits (deferred HARQ-ACK bits) for SPS PDSCH#1 and SPS PDSCH#3, for which SPS HARQ-ACK deferral is enabled, are transmitted in the target slot.

[0047] <HARQ-ACK CB> In 3GPP, regarding extensions to URLLC technology, enhancement of HARQ-ACK feedback functionality using HARQ-ACK CB is being studied. To date, 3GPP has specified Type 1 and Type 2 (hereinafter sometimes abbreviated as "Type 1 / 2") HARQ-ACK CB. Furthermore, in Rel-16, it was agreed to support HARQ-ACK reporting / feedback using Type 3 HARQ-ACK Codebook as a function for retransmitting HARQ-ACK bits for all HARQ process IDs. Furthermore, in Rel-17, 3GPP specified e-Type 3 HARQ-ACK CB, which is an extension of Type 3 HARQ-ACK CB. Terminal 20 may be instructed which type of HARQ-ACK CB to apply, for example, by higher layer signaling such as RRC. Each type of HARQ-ACK CB will be briefly described below.

[0048] (Type 1 HARQ-ACK CB) Fig. 5 is a diagram illustrating an overview of Type 1 HARQ-ACK CB. "Scheduled" in Fig. 5 indicates, for example, a slot scheduled by DCI. CC indicates a Component Carrier.

[0049] In Type 1 HARQ-ACK CB, terminal 20 generates a HARQ-ACK bit for a PDSCH regardless of whether a scheduled slot (PDSCH) exists. For example, the terminal may set a NACK for a non-scheduled PDSCH, as shown in the "HARQ-ACK codebook" in FIG. 5.

[0050] (Type 2 HARQ-ACK CB) Fig. 6 is a diagram illustrating an overview of Type 2 HARQ-ACK CB. (x, y) in Fig. 6 indicates, for example, a slot scheduled by DCI. Also, in Fig. 6, x corresponds to the C-DAI value, and y corresponds to the T-DAI value. DAI stands for Downlink Assignment Index. DAI indicates, for example, the allocation of a scheduled PDSCH in which HARQ-ACK is bundled into HARQ-ACK CB.

[0051] In Type 2 HARQ-ACK CB, terminal 20 generates a HARQ-ACK bit for a scheduled PDSCH. For example, terminal 20 may configure HARQ-ACK for a scheduled PDSCH as shown in "HARQ-ACK codebook" in FIG. 6.

[0052] Note that C-DAI counts up from 1. For example, in the case of a 2-bit field, C-DAI repeats 1->2->3->0->... C-DAI is counted up for each slot at each opportunity to receive DCI for each CC, and even if the slot changes, it counts up from the final value of the previous slot. T-DAI indicates the final value of C-DAI for each slot.

[0053] (Type 3 HARQ-ACK CB) In 3GPP Rel-16, it was agreed to support Type 3 HARQ-ACK CB as a function to retransmit HARQ-ACK bits for all HARQ process IDs. In addition, 3GPP agreed on the following points regarding Type 3 HARQ-ACK CB:

[0054] When provided with "pdsch-HARQ-ACK-OneShotFeedback-r16", terminal 20 determines the Type-3 HARQ-ACK CB. Terminal 20 multiplexes only the Type-3 HARQ-ACK CB in the PUCCH or PUSCH for transmission in the slot.

[0055] If terminal 20 detects a DCI format including a one-shot HARQ-ACK request field with a value of 1, terminal 20 determines a PUCCH or PUSCH for multiplexing the Type 3 HARQ-ACK CB. The Type 3 HARQ-ACK CB includes HARQ-ACK information of all configured HARQ processes of all configured serving cells. It is assumed that terminal 20 provides HARQ-ACK information in response to the Type 3 HARQ-ACK CB request N symbols after the last symbol of the PDCCH that provides the DCI format.

[0056] Fig. 7 is a diagram illustrating an overview of Type 3 HARQ-ACK CB. As shown in Fig. 6, in Type 3 HARQ-ACK CB, first, for each HARQ-ACK for the HARQ process of each CC, the HARQ-ACKs are arranged in ascending order of HPN (HARQ Process Number). Then, the HARQ-ACKs for the HARQ process of each CC are arranged in ascending order of CC number.

[0057] (e-Type 3 HARQ-ACK CB) In 3GPP, it was agreed to support e-Type 3 HARQ-ACK CB in Rel-17. In addition, 3GPP agreed on the following points regarding Type 3 HARQ-ACK CB:

[0058] The size of the e-Type 3 HARQ-ACK CB is smaller than the size of the Type 3 HARQ-ACK CB specified in Rel-16. The size of the e-Type 3 HARQ-ACK CB is defined by the RRC configuration.

[0059] e-Type 3 HARQ-ACK CB is triggered by DCI 1_1 and DCI 1_2. Hereinafter, the DCI that triggers e-Type 3 HARQ-ACK CB may be referred to as "e-Type 3 HARQ-ACK CB triggering DCI" or "triggering DCI."

[0060] In the e-Type 3 HARQ-ACK CB, one or more small CBs are configured by RRC. The triggering DCI indicates the configured small CBs. Each configured small CB may include HARQ processes of a subset of the configured CCs, or a subset of the configured HARQ processes (specific to the CC). Terminal 20 can transmit some of the subsets in an e-Type 3 HARQ-ACK CB.

[0061] The e-Type 3 HARQ-ACK CB is established regardless of the PHY priority. The triggering DCI indicates the PHY priority of the PUCCH that transmits the e-Type 3 HARQ-ACK CB.

[0062] If the HARQ process cannot be mapped to the e-Type 3 HARQ-ACK CB, terminal 20 does not assume that the Type 1 / 2 HARQ-ACK CB is transmitted in the same slot as the e-Type 3 HARQ-ACK CB.

[0063] In the following, the enhanced Type 3 HARQ-ACK Codebook will be referred to as "e-Type 3 HARQ-ACK CB." Also, a Type 3 HARQ-ACK CB other than e-Type 3 HARQ-ACK CB, i.e., the legacy Type 3 HARQ-ACK CB specified in Rel-16, will be simply referred to as "Type 3 HARQ-ACK CB." Also, Type 3 HARQ-ACK CB and e-Type 3 HARQ-ACK CB will be collectively referred to as "(e)Type 3 HARQ-ACK CB."

[0064] <one-shot triggering HARQ-ACK retransmission> In 3GPP, in Rel-17, it was agreed to support one-shot triggering HARQ-ACK retransmission by DL grant DCI along with e-Type 3 HARQ-ACK CB.

[0065] A single one-shot triggering DCI can trigger the retransmission of only one HARQ-ACK CB. Terminal 20 does not assume multiple triggering DCIs indicating the same PUCCH slot for retransmission of HARQ-ACK CBs in different PUCCH slots. That is, only one HARQ-ACK CB / PUCCH occasion can be retransmitted in one PUCCH slot.

[0066] In addition, RAN1#106-e discussed the "PUCCH slot offset" for indicating the HARQ-ACK CB / PUCCH occasion to be retransmitted, and two alternatives were presented. In the first alternative, the PUCCH slot offset defines the offset between the triggering DCI and the PUCCH slot of the HARQ-ACK CB to be retransmitted. In the second alternative, the PUCCH slot offset defines the offset between the new PUCCH slot for transmission and the PUCCH slot of the HARQ-ACK CB to be retransmitted.

[0067] <Considerations> The details of the HARQ-ACK bit based on one-shot triggering HARQ-ACK retransmission, taking into account the relationship with other HARQ-ACK CBs, have not yet been specified and are open to further study.

[0068] In response to the above considerations, this embodiment presents the following proposals and explains the cases, options (sometimes abbreviated as "Opt."), variations and / or alternations (sometimes abbreviated as "Alt.") for each proposal.

[0069] (Proposal 1) In Proposal 1, we explain the possibility of multiplexing a retransmission HARQ-ACK CB (hereinafter simply referred to as "retransmission HARQ-ACK CB") based on one-shot triggering HARQ-ACK retransmission with other HARQ-ACKs.

[0070] (Case 1) Case 1 relates to multiplexing of a retransmission HARQ-ACK CB and an initial (new) Type 1 / 2 HARQ-ACK CB.

[0071] (Option 1) In Option 1, the terminal 20 does not assume that any HARQ-ACK information of an initial Type 1 / 2 HARQ-ACK CB having the same priority as the PHY priority (hereinafter simply referred to as "priority") specified in the one-shot triggering DCI is transmitted in the same slot as a retransmission HARQ-ACK CB. Note that the priority may be represented by a priority index of 0 or 1, for example.

[0072] In this case, base station 10 controls the transmission timing of one-shot triggering DCI so that the PUCCH slot of the initial Type 1 / 2 HARQ-ACK CB and the PUCCH slot of the retransmission HARQ-ACK CB are not the same slot.

[0073] According to Option 1 of Proposal 1 / Case 1, terminal 20 does not need to perform processing such as multiplexing the initial Type 1 / 2 HARQ-ACK CB and the retransmission HARQ-ACK CB, thereby simplifying the operation (control) of terminal 20.

[0074] (Option 2) In Option 2, the transmission of the initial Type 1 / 2 HARQ-ACK CB is allowed to be valid in any slot, and at the same time, the transmission of the retransmission HARQ-ACK CB is allowed to be valid in any slot. Here, "to enable" corresponds to "enable."

[0075] (Option 2 terminal behavior) In the case of option 2, the terminal 20 may take one of the actions indicated by the following alternatives Alt. A and Alt. B.

[0076] (Alt. A) In Alt.A, the terminal 20 does not multiplex HARQ-ACKs, transmits one HARQA-CK CB in a slot, and drops the other HARQ-ACK CB. As a sub-alternation of Alt.A, the terminal 20 may perform any of the following operations.

[0077] Alt. A-1: ​​The terminal 20 always transmits an initial Type 1 / 2 HARQ-ACK CB and drops the retransmission HARQ-ACK CB.

[0078] Alt. A-2: The terminal 20 always transmits a retransmission HARQ-ACK CB and drops the initial Type 1 / 2 HARQ-ACK CB.

[0079] Alt. A-3: The terminal 20 transmits either the initial Type 1 / 2 HARQ-ACK CB or the retransmission HARQ-ACK CB, whichever corresponds to the latest (or earliest) DCI, and drops the other.

[0080] Alt. A-4: The terminal 20 transmits either the initial Type 1 / 2 HARQ-ACK CB or the retransmission HARQ-ACK CB, whichever has the larger / smaller UCI payload size, and drops the other.

[0081] (Alt. B) In Alt.B, terminal 20 multiplexes the initial Type 1 / 2 HARQ-ACK CB and the retransmission HARQ-ACK CB, and transmits the multiplexed HARQ-ACK CB within one slot. As a sub-alternation of Alt.B, terminal 20 may perform any of the following operations.

[0082] Alt. B-1: The terminal 20 multiplexes the initial Type 1 / 2 HARQ-ACK CB and the retransmission HARQ-ACK CB by adding the HARQ-ACK bit of the retransmission HARQ-ACK CB after the HARQ-ACK bit of the initial Type 1 / 2 HARQ-ACK CB that has the same priority as the priority specified in the one-shot triggering DCI.

[0083] Alt. B-2: The terminal 20 multiplexes the initial Type 1 / 2 HARQ-ACK CB and the retransmission HARQ-ACK CB by adding the HARQ-ACK bit of the initial Type 1 / 2 HARQ-ACK CB having the same priority as the priority specified in the one-shot triggering DCI after the HARQ-ACK bit of the retransmission HARQ-ACK CB.

[0084] Here, in Alt. B-2, when a Type 1 HARQ-ACK CB and a retransmission HARQ-ACK CB are multiplexed, terminal 20 extends the PDSCH slot set of the Type 1 HARQ-ACK CB in the following procedure.

[0085] (Step 1) First, terminal 20 determines the PDSCH slot set of the original PUCCH slot and the PDSCH slot set of the new reporting PUCCH slot separately according to the Rel-15 / 16 procedure for determining the PDSCH slot set.

[0086] (Step 2) Next, terminal 20 determines an extended PDSCH slot set as the sum of the PDSCH slot set of the original PUCCH slot and the PDSCH slot set of the new reporting PUCCH slot.

[0087] (Step 3) Next, terminal 20 determines a PDSCH candidate occasion for each PDSCH slot in the extended PDSCH slot set in accordance with the procedure for determining a PDSCH candidate occasion of Rel-15 / 16.

[0088] (Step 4) Next, terminal 20 generates one or more HARQ-ACK bits for each PDSCH candidate opportunity according to the Rel-15 / 16 procedure for HARQ-ACK bit generation / mapping, except that terminal 20 generates HARQ-ACK bits for PDSCH opportunities that are mapped to original PUCCH slots according to K1 (the offset value from PDSCH to HARQ-ACK). This is because in Rel-15 / 16, only NACKs are generated for PDSCH candidate opportunities that are not mapped to PUCCH slots.

[0089] In addition, in Alt. B-2, when a Type 2 HARQ-ACK CB and a retransmission HARQ-ACK CB are multiplexed, terminal 20 can add the HARQ-ACK bit of the Type 2 HARQ-ACK CB after the HARQ-ACK bit of the retransmission HARQ-ACK CB without extending the PDSCH slot set of the Type 2 HARQ-ACK CB.

[0090] FIG. 8 is a diagram showing an example of the relationship between a retransmission HARQ-ACK CB and other HARQ-ACKs. The horizontal axis in FIG. 8 represents the time axis. Ten slots are shown in FIG. 8 as an example. Each of the ten slots is marked with "D" or "U." Slots marked with "D" indicate DL slots, and slots marked with "U" indicate UL slots. In the example of FIG. 8, in CC#1, a HARQ-ACK CB including a HARQ-ACK bit corresponding to PDSCH#1 included in the first slot is transmitted in the fourth slot of the PCell. However, since it becomes necessary to retransmit the HARQ-ACK CB, a one-shot triggering DCI is transmitted in the sixth slot of CC#1. Also, in the example of FIG. 8, PDSCH#2 is included in the fourth slot.

[0091] In the example of Fig. 8, it is assumed that the PUCCH slot of the retransmission HARQ-ACK CB specified by the one-shot triggering DCI is the seventh slot. Also, in the example of Fig. 8, it is assumed that the PUCCH slot of the initial Type 1 / 2 HARQ-ACK CB corresponding to PDSCH#2 is the seventh slot.

[0092] In the case of Alt.A of Option 2, in the example of Figure 8, terminal 20 does not multiplex HARQ-ACKs, but transmits one of the HARQ-ACK CBs, the retransmission HARQ-ACK CB and the initial Type 1 / 2 HARQ-ACK CB, in the seventh slot, and drops the other HARQ-ACK CB.

[0093] In the case of Alt. B of option 2, in the example of FIG. 8, terminal 20 multiplexes the initial Type 1 / 2 HARQ-ACK CB and the retransmission HARQ-ACK CB, and transmits the multiplexed HARQ-ACK CB in the seventh slot.

[0094] According to Option 2 of Proposal 1 / Case 1, terminal 20 autonomously performs processes such as multiplexing the retransmission HARQ-ACK CB and the initial Type 1 / 2 HARQ-ACK CB, so there is no need to impose constraints on the transmission timing of the one-shot triggering DCI.

[0095] (Case 2) Case 2 relates to multiplexing of a retransmission HARQ-ACK CB and (e)Type 3 HARQ-ACK CB.

[0096] (Option 0) In option 0, terminal 20 does not assume that (e) Type 3 HARQ-ACK CB feedback is enabled for any DCI format and, at the same time, that one-shot triggering HARQ-ACK retransmission is enabled for any DCI format.

[0097] In this case, base station 10 controls whether to enable / disable (e) Type 3 HARQ-ACK CB feedback or whether to enable / disable one-shot triggering HARQ-ACK retransmission, so that the PUCCH slot of (e) Type 3 HARQ-ACK CB and the PUCCH slot of the retransmission HARQ-ACK CB are not the same slot.

[0098] According to option 0 of Proposal 1 / Case 2, terminal 20 does not need to perform processing such as multiplexing (e) Type 3 HARQ-ACK CB and retransmission HARQ-ACK CB, thereby simplifying the operation (control) of terminal 20.

[0099] (Option 1) In Option 1, (e)Type 3 HARQ-ACK CB feedback and one-shot triggering HARQ-ACK retransmission are allowed to be enabled simultaneously, but restrictions are placed on the multiplexing of HARQ-ACK bits.

[0100] In this case, base station 10 controls the transmission timing of the (e)Type 3 HARQ-ACK CB triggering DCI or the transmission timing of the one-shot triggering DCI so that, in an e-Type 3 HARQ-ACK CB and a retransmission HARQ-ACK CB that satisfy the set constraints, the PUCCH slot of the (e)Type 3 HARQ-ACK CB and the PUCCH slot of the retransmission HARQ-ACK CB are not the same slot.

[0101] According to Option 1 of Proposal 1 / Case 2, terminal 20 does not need to perform processing such as multiplexing (e) Type 3 HARQ-ACK CB and retransmission HARQ-ACK CB, which satisfy the set constraints, thereby simplifying the operation (control) of terminal 20.

[0102] In this embodiment, the following three sub-options are listed for the constraints of option 1.

[0103] (Option 1-1) In option 1-1, a restriction is set that a retransmission HARQ-ACK and (e)Type 3 HARQ-ACK CB are not permitted to be transmitted in the same slot.

[0104] In Option 1-1, further constraints may be set on the relationship between the HARQ-ACK bit of the retransmission HARQ-ACK and the HARQ-ACK bit of the (e) Type 3 HARQ-ACK CB, as shown below.

[0105] (Variation 1) In variation 1 of option 1-1, a constraint may be set such that if none of the HARQ-ACK bits of the retransmission HARQ-ACK are included in the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB, the (e)Type 3 HARQ-ACK CB and the retransmission HARQ-ACK are not allowed to be transmitted in the same slot.

[0106] (Variation 2) In variation 2 of option 1-1, a constraint may be set such that if none of the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB is included in the HARQ-ACK bits of the retransmission HARQ-ACK CB, the (e)Type 3 HARQ-ACK CB and the retransmission HARQ-ACK are not allowed to be transmitted in the same slot.

[0107] (Option 1-2) In option 1-2, a constraint is set such that if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is the same as the priority specified in the one-shot triggering DCI, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are not permitted to be transmitted in the same slot.

[0108] In option 1-2, further constraints may be set on the relationship between the HARQ-ACK bit of the retransmission HARQ-ACK and the HARQ-ACK bit of the (e) Type 3 HARQ-ACK CB, as shown below.

[0109] (Variation 1) In variation 1 of option 1-2, a constraint may be set such that if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is the same as the priority specified in the one-shot triggering DCI and none of the HARQ-ACK bits of the retransmission HARQ-ACK are included in the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are not allowed to be transmitted in the same slot.

[0110] (Variation 2) In variation 2 of option 1-2, a constraint may be set such that if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is the same as the priority specified in the one-shot triggering DCI and none of the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB are included in the HARQ-ACK bits of the retransmission HARQ-ACK CB, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are not allowed to be transmitted in the same slot.

[0111] (Options 1-3) In options 1-3, a constraint is set that if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is different from the priority specified in the one-shot triggering DCI, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are not allowed to be transmitted in the same slot.

[0112] In Options 1-3, further constraints may be set on the relationship between the HARQ-ACK bit of the HARQ-ACK for retransmission and the HARQ-ACK bit of the (e) Type 3 HARQ-ACK CB, as shown below.

[0113] (Variation 1) In variation 1 of option 1-3, a constraint may be set such that if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is different from the priority specified in the one-shot triggering DCI and none of the HARQ-ACK bits of the retransmission HARQ-ACK are included in the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are not allowed to be transmitted in the same slot.

[0114] (Variation 2) In variation 2 of options 1-3, a constraint may be set such that if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is different from the priority specified in the one-shot triggering DCI and none of the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB is included in the HARQ-ACK bits of the retransmission HARQ-ACK CB, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are not allowed to be transmitted in the same slot.

[0115] (Option 2) In option 2, (e)Type 3 HARQ-ACK CB feedback and one-shot triggering HARQ-ACK retransmission are allowed to be enabled simultaneously. Also, there are no restrictions on multiplexing of HARQ-ACK bits. Terminal 20 always assumes that (e)Type 3 HARQ-ACK CB feedback is enabled for any DCI format, and that one-shot triggering HARQ-ACK retransmission is enabled for any DCI format.

[0116] In this embodiment, the following three sub-options are listed for option 2.

[0117] (Option 2-1) Option 2-1 allows the retransmission HARQ-ACK and (e)Type 3 HARQ-ACK CB to be transmitted in the same slot.

[0118] In Option 2-1, the conditions for acceptance may be set as shown in the following variations.

[0119] (Variation 1) In variation 1 of option 2-1, if none of the HARQ-ACK bits of the retransmission HARQ-ACK are included in the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB, the (e)Type 3 HARQ-ACK CB and the retransmission HARQ-ACK are allowed to be transmitted in the same slot.

[0120] (Variation 2) In variation 2 of option 2-1, if none of the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB is included in the HARQ-ACK bits of the retransmission HARQ-ACK CB, the (e)Type 3 HARQ-ACK CB and the retransmission HARQ-ACK are allowed to be transmitted in the same slot.

[0121] (Option 2-2) In option 2-2, if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is the same as the priority specified in the one-shot triggering DCI, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are allowed to be transmitted in the same slot.

[0122] In Option 2-2, the conditions for acceptance may be set as shown in the following variations.

[0123] (Variation 1) In variation 1 of option 2-2, if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is the same as the priority specified in the one-shot triggering DCI, and further, none of the HARQ-ACK bits of the retransmission HARQ-ACK are included in the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are permitted to be transmitted in the same slot.

[0124] (Variation 2) In variation 2 of option 2-2, if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is the same as the priority specified in the one-shot triggering DCI, and further, none of the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB is included in the HARQ-ACK bits of the retransmission HARQ-ACK CB, the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB are permitted to be transmitted in the same slot.

[0125] (Option 2-3) In option 2-3, if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is different from the priority specified in the one-shot triggering DCI, it is permitted for the retransmission HARQ-ACK and (e)Type 3 HARQ-ACK CB to be transmitted in the same slot.

[0126] In option 2-3, the conditions for acceptance may be set as shown in the following variations.

[0127] (Variation 1) In variation 1 of option 2-3, if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is different from the priority specified in the one-shot triggering DCI, and further, none of the HARQ-ACK bits of the retransmission HARQ-ACK are included in the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB, it is permitted for the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB to be transmitted in the same slot.

[0128] (Variation 2) In variation 2 of option 2-3, if the priority specified in the (e)Type 3 HARQ-ACK CB triggering DCI is different from the priority specified in the one-shot triggering DCI, and further, none of the HARQ-ACK bits in the (e)Type 3 HARQ-ACK CB is included in the HARQ-ACK bits of the retransmission HARQ-ACK CB, it is permitted for the retransmission HARQ-ACK and the (e)Type 3 HARQ-ACK CB to be transmitted in the same slot.

[0129] (Option 2 terminal behavior) The operation of the terminal 20 in option 2 will be explained below for each suboption.

[0130] (Option 2-1 terminal operation) In the case of option 2-1, the terminal 20 may perform one of the actions shown in the following alternatives Alt. 1A and Alt. 1B.

[0131] (Alt.1A) In Alt.1A, the terminal 20 does not multiplex HARQ-ACKs, transmits one HARQA-CK CB in a slot, and drops the other HARQ-ACK CB. As a sub-alternation of Alt.1A, the terminal 20 may perform any of the following operations.

[0132] Alt. 1A-1: Terminal 20 always transmits e-Type 3 HARQ-ACK CB and drops retransmission HARQ-ACK CB.

[0133] Alternative 1A-2: Terminal 20 always transmits a retransmission HARQ-ACK CB and drops e-Type 3 HARQ-ACK CB.

[0134] Alt. 1A-3: The terminal 20 transmits either the e-Type 3 HARQ-ACK CB or the retransmission HARQ-ACK CB, whichever corresponds to the latest (or earliest) DCI, and drops the other.

[0135] Alt. 1A-4: The terminal 20 transmits either the e-Type 3 HARQ-ACK CB or the retransmission HARQ-ACK CB, whichever has the larger / smaller UCI payload size, and drops the other.

[0136] (Alt.1B) In Alt.1B, terminal 20 multiplexes (e) Type 3 HARQ-ACK CB and retransmission HARQ-ACK CB, and transmits the multiplexed HARQ-ACK CB within one slot. As a sub-alternation of Alt.1B, terminal 20 may perform any of the following operations.

[0137] Alt.1B-1: The terminal 20 multiplexes the (e) Type 3 HARQ-ACK CB and the retransmission HARQ-ACK CB by adding the HARQ-ACK bit of the (e) Type 3 HARQ-ACK CB after the HARQ-ACK bit of the (e) Type 3 HARQ-ACK CB. As a sub-alternation of Alt.1B-1, the terminal 20 may perform any of the following operations.

[0138] Alt.1B-1-1: Terminal 20 adds the HARQ-ACK bits of the retransmission HARQ-ACK CB that are not included in the (e) Type 3 HARQ-ACK CB to the end of the HARQ-ACK bits of the (e) Type 3 HARQ-ACK CB.

[0139] Alt. 1B-1-2: Terminal 20 adds the HARQ-ACK bit of the retransmission HARQ-ACK CB after the HARQ-ACK bit of the (e) Type 3 HARQ-ACK CB that is not included in the retransmission HARQ-ACK CB.

[0140] Alt.1B-2: The terminal 20 multiplexes the (e)Type 3 HARQ-ACK CB and the retransmission HARQ-ACK CB by adding the HARQ-ACK bit of the (e)Type 3 HARQ-ACK CB after the HARQ-ACK bit of the retransmission HARQ-ACK CB. As a sub-alternation of Alt.1B-2, the terminal 20 may perform any of the following operations.

[0141] Alt. 1B-2-1: Terminal 20 adds the HARQ-ACK bits of the (e) Type 3 HARQ-ACK CB that are not included in the retransmission HARQ-ACK CB to the end of the HARQ-ACK bits of the retransmission HARQ-ACK CB.

[0142] Alt.1B-1-2: Terminal 20 adds the HARQ-ACK bit of (e) Type 3 HARQ-ACK CB after the HARQ-ACK bit not included in (e) Type 3 HARQ-ACK CB among the HARQ-ACK bits of the retransmission HARQ-ACK CB.

[0143] Alt.1B-3: The terminal 20 multiplexes the (e)Type 3 HARQ-ACK CB and the retransmission HARQ-ACK CB by inserting the HARQ-ACK bit of the retransmission HARQ-ACK CB into the HARQ-ACK bit of the (e)Type 3 HARQ-ACK CB. As a sub-alternation of Alt.1B-3, the terminal 20 may insert, into the (e)Type 3 HARQ-ACK CB, the HARQ-ACK bit that is not included in the (e)Type 3 HARQ-ACK CB among the HARQ-ACK bits of the retransmission HARQ-ACK CB, based on the order of the HARQ process ID and the serving cell index.

[0144] Alt.1B-4: The terminal 20 multiplexes the (e)Type 3 HARQ-ACK CB and the retransmission HARQ-ACK CB by inserting the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB into the HARQ-ACK bits of the retransmission HARQ-ACK CB. As a sub-alternation of Alt.1B-4, the terminal 20 may insert, into the (e)Type 3 HARQ-ACK CB, the HARQ-ACK bits that are not included in the retransmission HARQ-ACK CB among the HARQ-ACK bits of the (e)Type 3 HARQ-ACK CB, based on the order of the HARQ process ID and the serving cell index.

[0145] (Option 2-2 terminal operation) In the case of option 2-2, the terminal 20 may perform one of the actions indicated by the following alternatives Alt. 2A and Alt. 2B.

[0146] (Alt.2A) In Alt.2A, the terminal 20 does not multiplex HARQ-ACKs, transmits one HARQA-CK CB within a slot, and drops the other HARQ-ACK CB. As a sub-alternation of Alt.1A, the terminal 20 may perform any of Alt.1A-1, Alt.1A-2, Alt.1A-3, and Alt.1A-4.

[0147] (Alt.2B) In Alt.2B, terminal 20 multiplexes (e) Type 3 HARQ-ACK CB and retransmission HARQ-ACK CB in the same way as in Alt.2B, and transmits the multiplexed HARQ-ACK CB within one slot. As a sub-alternation of Alt.2B, terminal 20 may perform any of Alt.1B-1, Alt.1B-2, and Alt.2B-3.

[0148] The PUCCH resources for the multiplexed HARQ-ACK CB are configured by PUCCH-Config along with the priorities specified in (e) Type 3 HARQ-ACK CB triggering DCI and one-shot triggering DCI.

[0149] (Option 2-3 terminal operation) In the case of option 2-3, the terminal 20 may take one of the actions indicated by the following alternatives Alt. 3A and Alt. 3B.

[0150] (Alt.3A) In Alt.3A, the PUCCH resource for (e) Type 3 HARQ-ACK CB and the PUCCH resource for retransmission HARQ-ACK CB are configured separately in the corresponding PUCCH-Config. If the two configured PUCCH resources overlap, collision processing is applied in terminal 20.

[0151] If a collision occurs, that is, if two PUCCH resources overlap, the terminal 20 may perform any one of Alt.1A-1, Alt.1A-2, Alt.1A-3, and Alt.1A-4 described above.

[0152] (Alt.3B) In Alt.3B, the terminal 20 does not multiplex HARQ-ACKs, transmits one HARQA-CK CB in a slot, and drops the other HARQ-ACK CB. As a sub-alternation of Alt.3B, the terminal 20 may perform any of the following operations.

[0153] Alt. 3B-1: Terminal 20 always transmits e-Type 3 HARQ-ACK CB and drops retransmission HARQ-ACK CB.

[0154] Alt. 3B-2: Terminal 20 always transmits a retransmission HARQ-ACK CB and drops e-Type 3 HARQ-ACK CB.

[0155] Alt. 3B-3: The terminal 20 transmits either the e-Type 3 HARQ-ACK CB or the retransmission HARQ-ACK CB, whichever corresponds to the latest (or earliest) DCI, and drops the other.

[0156] Alt.3B-4: The terminal 20 transmits either the e-Type 3 HARQ-ACK CB or the retransmission HARQ-ACK CB, whichever has the larger / smaller UCI payload size, and drops the other.

[0157] Alt.3B-5: Terminal 20 transmits a HARQ-ACK CB for a specific priority (e.g., priority index 0 (or 1)) specified in the DCI, and drops HARQ-ACK CBs for priorities other than the specific priority (e.g., priority index 1 (or 0)).

[0158] (Alt.3C) In Alt.3C, terminal 20 multiplexes (e) Type 3 HARQ-ACK CB and retransmission HARQ-ACK CB, and transmits the multiplexed HARQ-ACK CB within one slot. As a sub-alternation of Alt.3C, terminal 20 may perform any of Alt.1B-1, Alt.1B-2, and Alt.1B-3.

[0159] The PUCCH resources for the multiplexed HARQ-ACK CB are configured by a PUCCH-Config with one of the following alternation priorities: Here, the priority may be one of the following: (1) Always a priority with a priority index of 1 (or 0) (2)(e) Type 3 HARQ-ACK CB triggering Priority specified in DCI (3) PHY priority specified in one-shot triggering DCI (4)(e) Type 3 HARQ-ACK CB triggering DCI and one-shot triggering DCI, the priority indicated by the latest (or earliest) DCI. (5) The priority indicated by the triggering DCI corresponding to the HARQ-ACK CB with the larger / smaller UCI payload size among the e-Type 3 HARQ-ACK CB and the retransmission HARQ-ACK CB

[0160] According to Option 2 of Proposal 1 / Case 2, terminal 20 autonomously performs processes such as multiplexing the retransmission HARQ-ACK CB and the (e)Type 3 HARQ-ACK CB, so there is no need to impose constraints on the transmission timing of one-shot triggering DCI, etc.

[0161] (Proposal 2) Proposal 2 explains the selection of the HARQ-ACK bit in the slot specified by the one-shot triggering DCI.

[0162] (Option 1) In Option 1, if there is an initial Type 1 / 2 HARQ-ACK bit in the HARQ-ACK CB of the first transmission that is the target of retransmission (hereinafter referred to as "initial HARQ-ACK CB"), terminal 20 retransmits the initial Type 1 / 2 HARQ-ACK bit in the retransmission HARQ-ACK CB. Here, the initial Type 1 / 2 HARQ-ACK bit means the HARQ-ACK bit reported in a slot that complies with the legacy Type 1 / 2 reporting rule.

[0163] The following describes the sub-options of Option 1.

[0164] (Option 1-0) In option 1-0, the terminal 20 does not retransmit any HARQ-ACK bits other than the initial Type 1 / 2 HARQ-ACK bit in the initial HARQ-ACK CB.

[0165] (Option 1-1) In option 1-1, the terminal 20 does not assume that the HARQ-ACK CB of the priority specified in the one-shot triggering DCI includes a postponed SPS HARQ-ACK bit.

[0166] (Variation 1) In variation 1 of option 1-1, terminal 20 does not assume that SPS HARQ-ACK postponement is enabled for any SPS configuration and, at the same time, one-shot triggering HARQ-ACK retransmission is enabled for any DCI format.

[0167] (Variation 2) In variation 2 of option 1-1, if SPS HARQ-AC deferral is enabled for any SPS configuration with HARQ-ACK of a particular priority, terminal 20 does not expect to receive a one-shot triggering DCI indicating that particular priority.

[0168] (Option 1-2) In option 1-2, terminal 20 does not assume transmission of (e) Type 3 HARQ-ACK CB in the PUCCH slot of the retransmission HARQ-ACK CB.

[0169] (Variation 1) In variation 1 of option 1-2, terminal 20 enables one-shot triggering HARQ-ACK retransmission for any DCI format, and at the same time does not assume transmission of (e)Type 3 HARQ-ACK in the PUCCH slot of the retransmission HARQ-ACK CB.

[0170] (Variation 2) In variation 2 of option 1-2, terminal 20 assumes that the priority of the PUCCH resource for (e)Type 3 HARQ-ACK CB is the same as the priority specified in the one-shot triggering DCI, and at the same time, does not assume transmission of (e)Type 3 HARQ-ACK CB in the PUCCH slot of the retransmission HARQ-ACK CB.

[0171] (Options 1-3) In options 1-3, the terminal 20 does not assume that a HARQ-ACK CB having the same priority as the priority specified in the one-shot triggering DCI includes a HARQ-ACK bit of a retransmission HARQ-ACK CB.

[0172] According to option 1 of proposal 2, in one-shot triggering HARQ-ACK retransmission, terminal 20 retransmits the initial Type 1 / 2 HARQ-ACK CB without multiplexing it with other HARQ-ACK CBs, thereby simplifying the operation (control) of terminal 20.

[0173] (Option 2) In option 2, if there is an initial Type 1 / 2 HARQ-ACK bit in the initial HARQ-ACK CB, terminal 20 multiplexes the initial Type 1 / 2 HARQ-ACK bit with other HARQ-ACK bits in the retransmission HARQ-ACK CB and retransmits the multiplexed bit. Here, the "other HARQ-ACK bits" may include one or more of the following alternatives: Alt.1: Deferred SPS HARQ-ACK bits included in HARQ-ACK CB of the same priority in the slot specified by one-shot triggering DCI Alt.2: If the priority of the PUCCH resource of (e)Type 3 HARQ-ACK CB is the same as the priority specified in the one-shot triggering DCI, the HARQ-ACK bit in (e)Type 3 HARQ-ACK CB in the slot specified in the one-shot triggering DCI Alt.3: HARQ-ACK bit included in HARQ-ACK CB for retransmission based on other one-shot triggering HARQ-ACK retransmissions with the same priority in the slot specified by one-shot triggering DCI

[0174] Note that the order of the initial Type 1 / 2 HARQ-ACK bits and other HARQ-ACK bits can follow the order of the original HARQ-ACK CB.

[0175] (Variation) If Alt. 1 above does not apply to Option 2, then Option 1-1 may or may not apply to Option 1.

[0176] If Alt. 2 above does not apply to Option 2, Options 1-3 may or may not apply to Option 1.

[0177] If Alt. 3 above does not apply to Option 2, Options 1-3 may or may not apply to Option 1.

[0178] FIG. 9 is a diagram showing an example of selection of HARQ-ACK bits in one-shot triggering HARQ-ACK retransmission of postponed SPS HARQ-ACK bits. The horizontal axis in FIG. 9 represents the time axis. As in FIG. 8, FIG. 9 exemplarily shows 10 slots. Each of the 10 slots is labeled "D" or "U." In the example of FIG. 9, in CC#1, the first slot includes SPS PDSCH#1, the second slot includes SPS PDSCH#2, and the third slot includes SPS PDSCH#3. Also, in the example of FIG. 9, it is assumed that the target PUCCH slots of SPS HARQ-ACKs corresponding to SPS PDSCH#1 and SPS PDSCH#2 are the fourth slots due to postponement, and the target PUCCH slot of SPS HARQ-ACK corresponding to SPS PDSCH#3 is the fourth slot.

[0179] Also, in the example of Figure 9, a HARQ-ACK CB including HARQ-ACK bits corresponding to SPS PDSCH #1, SPS PDSCH #2, and SPS PDSCH #3 is transmitted in the fourth slot of the PCell, but since it becomes necessary to retransmit the HARQ-ACK CB, a one-shot triggering DCI is transmitted in the sixth slot of CC #1, and the PUCCH slot for the retransmission HARQ-ACK CB specified by the one-shot triggering DCI is the seventh slot.

[0180] In the case of option 1-0, in the example of FIG. 9, terminal 20 transmits only the HARQ-ACK bit corresponding to SPS PDSCH#3 in the seventh slot.

[0181] Option 1-1 is an error case in the example of Figure 9.

[0182] In the case of Alt. 1 of option 2, in the example of FIG. 9, terminal 20 transmits HARQ-ACK bits corresponding to SPS PDSCH #1, SPS PDSCH #2, and SPS PDSCH #3, respectively, in the seventh slot.

[0183] FIG. 10 is a diagram showing an example of selection of HARQ-ACK bits in one-shot triggering HARQ-ACK retransmission of HARQ-ACK bits in (e) Type 3 HARQ-ACK CB. The horizontal axis in FIG. 10 represents the time axis. As in FIG. 8, FIG. 10 exemplarily shows 10 slots. Each of the 10 slots is labeled "D" or "U." In the example of FIG. 10, in CC#1, e-Type 3 HARQ-ACK CB triggering DCI is transmitted in the second slot, and the e-Type 3 HARQ-ACK CB is transmitted in the fourth slot of the PCell. However, since retransmission of the e-Type 3 HARQ-ACK CB is required, one-shot triggering DCI is transmitted in the sixth slot of CC#1, and the PUCCH slot for the HARQ-ACK CB for retransmission specified by the one-shot triggering DCI is the seventh slot.

[0184] In the case of option 1-0, in the example of FIG. 10, the terminal 20 does not retransmit the HARQ-ACK bit.

[0185] Option 1-1 is an error case in the example of Figure 10.

[0186] In the case of Alt.2 of option 2, in the example of FIG. 10, terminal 20 transmits the HARQ-ACK bit of e-Type 3 HARQ-ACK CB in the seventh slot.

[0187] FIG. 11 is a diagram showing an example of HARQ-ACK bit selection when two retransmissions are performed by one-shot triggering HARQ-ACK retransmission. The horizontal axis in FIG. 11 represents the time axis. As in FIG. 8, FIG. 11 shows 10 slots as an example. Each of the 10 slots is labeled "D" or "U." In the example of FIG. 11, in CC#1, the first slot includes PDSCH#1 and the second slot includes PDSCH#2. Also, in the example of FIG. 11, it is assumed that the target PUCCH slots of HARQ-ACKs corresponding to PDSCH#1 and PDSCH#2 are the third slots.

[0188] Also, in the example of Figure 11, a HARQ-ACK CB including HARQ-ACK bits corresponding to PDSCH #1 and PDSCH #2 is transmitted in the third slot of the PCell, but since it becomes necessary to retransmit the HARQ-ACK CB, a one-shot triggering DCI is transmitted in the fourth slot of CC #1, and the PUCCH slot for the retransmission HARQ-ACK CB specified by the one-shot triggering DCI is the fifth slot.

[0189] In the example of Figure 11, a HARQ-ACK CB including HARQ-ACK bits corresponding to PDSCH #1 and PDSCH #2 is retransmitted in the fifth slot of PCell, but since a second retransmission of the HARQ-ACK CB is required, a one-shot triggering DCI is transmitted in the seventh slot of CC #1, and the PUCCH slot for the retransmission HARQ-ACK CB specified by the one-shot triggering DCI is the eighth slot.

[0190] In the case of option 1-0, in the example of FIG. 11, the terminal 20 does not transmit any HARQ-ACK bits.

[0191] Option 1-1 is an error case in the example of Figure 11.

[0192] In the case of Alt. 3 of option 2, in the example of FIG. 11, terminal 20 transmits HARQ-ACK bits corresponding to PDSCH #1 and PDSCH #2 in the eighth slot.

[0193] FIG. 12 is a diagram showing an example of HARQ-ACK bit selection in a case where the HARQ-ACK bit for one retransmission by one-shot triggering HARQ-ACK retransmission and the HARQ-ACK bit for two retransmissions are mixed. The horizontal axis in FIG. 12 represents the time axis. As in FIG. 8, FIG. 12 exemplarily shows 10 slots. Each of the 10 slots is labeled "D" or "U." In the example of FIG. 12, in CC#1, the first slot includes PDSCH#1 and the second slot includes PDSCH#2. Also, in the example of FIG. 12, it is assumed that the target PUCCH slots of the HARQ-ACKs corresponding to PDSCH#1 and PDSCH#2 are the third slots.

[0194] 12, a HARQ-ACK CB including HARQ-ACK bits corresponding to PDSCH #1 and PDSCH #2 is transmitted in the third slot of PCell, but since it becomes necessary to retransmit the HARQ-ACK CB, a one-shot triggering DCI is transmitted in the fourth slot of CC #1, and the PUCCH slot of the HARQ-ACK CB for retransmission specified by the one-shot triggering DCI is the fifth slot. Also, in the example of FIG. 12, the target PUCCH slot of the HARQ-ACK corresponding to PDSCH #3 is the fifth slot.

[0195] In the example of Figure 12, a HARQ-ACK CB including HARQ-ACK bits corresponding to PDSCH #1, PDSCH #2, and PDSCH #3 is transmitted in the fifth slot of the PCell, but since it becomes necessary to retransmit the HARQ-ACK CB, a one-shot triggering DCI is transmitted in the seventh slot of CC #1, and the PUCCH slot for the retransmission HARQ-ACK CB specified by the one-shot triggering DCI is the eighth slot.

[0196] In the case of option 1-0, in the example of FIG. 12, terminal 20 transmits only the HARQ-ACK bit corresponding to PDSCH#3 in the eighth slot.

[0197] Option 1-1 is an error case in the example of FIG.

[0198] In the case of Alt. 3 of option 2, in the example of FIG. 12, terminal 20 transmits HARQ-ACK bits corresponding to PDSCH #1, PDSCH #2, and PDSCH #3, respectively, in the eighth slot.

[0199] According to Option 2 of Proposal 2, the terminal 20 multiplexes the initial Type 1 / 2 HARQ-ACK CB with other HARQ-ACK CBs and retransmits them in one-shot triggering HARQ-ACK retransmission, thereby enabling efficient use of resources.

[0200] In the above proposals, the case where the retransmission based on one-shot triggering HARQ-ACK retransmission is HARQ-ACK CB has been described, but the present disclosure is not limited to this and may be HARQ-ACK bits. Also, the type of HARQ-ACK CB for retransmission may be any of type 1, type 2, legacy type 3 specified in Rel-16, and enhanced type 3 specified in Rel-17.

[0201] By adopting any of the proposals and options (or alternatives (Alt.)) of each proposal described above, a terminal can appropriately control the HARQ-ACK bits transmitted in the retransmission HARQ-ACK CB based on one-shot triggering HARQ-ACK retransmission, taking into account the relationship with other HARQ-ACK CBs.

[0202] In each proposal described above, which option (or alternative) to use among the options (or alternatives (Alt.)) of each proposal may be specified by a specification or may be set by a parameter of a higher layer. Furthermore, which option (or alternative) to use among the options (or alternatives) of each proposal may be reported by the terminal using terminal capability information (e.g., "UE capability"). Furthermore, which option (or alternative) to use among the options (or alternatives) of each proposal may be determined by a combination of the setting of a parameter of a higher layer and the reported capability information of the terminal. For example, the base station may determine one or more options (or alternatives) from among the options (or alternatives) usable by the terminal, which are indicated by the reported capability information of the terminal, and the determined information may be set by a parameter of a higher layer. Note that the present invention is not limited to the example of setting by a parameter of a higher layer, and the information may be notified by control information of the physical layer (e.g., DCI).

[0203] In this embodiment, "slot" may be replaced with "sub-slot." Also, in the above embodiment, "slot" is a term that refers to a certain time interval, and may be replaced with other notations. For example, "slot" may be replaced with other notations such as "symbol," "time interval," or "time resource."

[0204] Although the present embodiment has been described using SPS as an example, the present disclosure is not limited to this. For example, the present disclosure may be applied to persistent scheduling or dynamic scheduling instead of SPS.

[0205] Furthermore, in the present embodiment, the SPS PDSCH and the SPS HARQ-ACK for the SPS PDSCH have been described as examples, but the present disclosure is not limited thereto. For example, the present disclosure may be applied to a data channel different from the SPS PDSCH and an acknowledgement response for the data channel. Furthermore, the present disclosure may be applied not only to a data channel but also to a control channel (e.g., a PDCCH) and an acknowledgement response for the control channel. Furthermore, the present disclosure may be applied to feedback information different from the SPS HARQ-ACK.

[0206] Different options (or alternations) may be applied to different PUCCH repetition schemes, for example, the proposed options applied to a slot-based PUCCH repetition scheme may be different from the proposed options applied to a sub-slot-based PUCCH repetition scheme.

[0207] The capability information of the terminal (UE capability) may include, for example, information specifying whether the terminal supports one-shot triggering HARQ-ACK retransmission specified in Rel-17, information specifying whether the terminal supports SPS HARQ-ACK deferral, information specifying whether the terminal supports legacy Type 3 HARQ-ACK CB specified in Rel-16, information specifying whether the terminal supports e-Type 3 HARQ-ACK CB specified in Rel-17, information specifying whether the terminal simultaneously supports one-shot triggering HARQ-ACK retransmission specified in Rel-17 and SPS HARQ-ACK deferral, information specifying whether the terminal simultaneously supports one-shot triggering HARQ-ACK retransmission specified in Rel-17 and legacy Type 3 HARQ-ACK CB specified in Rel-16, information specifying whether the terminal simultaneously supports one-shot triggering HARQ-ACK retransmission specified in Rel-17 and legacy Type 3 HARQ-ACK CB specified in Rel-16, information specifying whether the terminal simultaneously supports one-shot triggering HARQ-ACK The terminal capability information may include information specifying whether the terminal simultaneously supports retransmission and e-Type 3 HARQ-ACK CB defined in Rel-17. The terminal capability information may also include information indicating whether the terminal supports each of the proposals described above and whether it supports each option (or each alternative) of each proposal.

[0208] In this embodiment, the expressions "deferral" and "postponing" may be interchangeable. Also, "deferral" and "postponing" may be interchangeable with other expressions such as "delay," "postponing," and "tardiness."

[0209] In addition, in this embodiment, the expressions "limitation" and "restriction" may be interchangeable, and the expressions "limitation" and "restriction" may be interchangeable with other expressions such as "constraint," "limitation," and "restriction."

[0210] <Example of a wireless communication system> The wireless communication system according to the present embodiment includes a base station 10 shown in Fig. 13 and a terminal 20 shown in Fig. 14. The number of base stations 10 and the number of terminals 20 are not particularly limited. The system may be one in which two base stations 10 communicate with one terminal 20. The wireless communication system may be a wireless communication system conforming to New Radio (NR). For example, the wireless communication system may be a wireless communication system conforming to a method called URLLC and / or IIoT.

[0211] The wireless communication system may be a wireless communication system conforming to a method called 5G, Beyond 5G, 5G Evolution, or 6G.

[0212] The base station 10 may be called an NG-RAN Node, ng-eNB, eNodeB (eNB), or gNodeB (gNB). The terminal 20 may be called User Equipment (UE). The base station 10 may also be considered as a device included in a network to which the terminal 20 is connected.

[0213] The wireless communication system may include a Next Generation-Radio Access Network (hereinafter, referred to as NG-RAN). The NG-RAN includes multiple NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). Note that the NG-RAN and 5GC may be simply referred to as a "network."

[0214] The base station 10 performs wireless communication with the terminal 20. For example, the performed wireless communication complies with NR. At least one of the base station 10 and the terminal 20 may support Massive MIMO (Multiple-Input Multiple-Output), which generates a more highly directional beam (BM) by controlling radio signals transmitted from multiple antenna elements. Furthermore, at least one of the base station 10 and the terminal 20 may support Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CC). Furthermore, at least one of the base station 10 and the terminal 20 may support Dual Connectivity (DC), which performs communication between the terminal 20 and each of multiple base stations 10.

[0215] The wireless communication system may support multiple frequency bands. For example, the wireless communication system supports Frequency Range (FR) 1 and FR2. The frequency bands of each FR are, for example, as follows: FR1: 410MHz~7.125GHz FR2: 24.25GHz~52.6GHz

[0216] FR1 may use a Sub-Carrier Spacing (SCS) of 15 kHz, 30 kHz, or 60 kHz, and may use a bandwidth (BW) of 5 MHz to 100 MHz. FR2 is, for example, a higher frequency than FR1. FR2 may use an SCS of 60 kHz or 120 kHz, and may use a bandwidth (BW) of 50 MHz to 400 MHz. FR2 may also include an SCS of 240 kHz.

[0217] The wireless communication system according to this embodiment may support a frequency band higher than the FR2 frequency band. For example, the wireless communication system according to this embodiment may support a frequency band exceeding 52.6 GHz up to 114.25 GHz. Such a high frequency band may be called "FR2x."

[0218] Alternatively, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) having a larger Sub-Carrier Spacing (SCS) than the above-mentioned example may be applied. Furthermore, DFT-S-OFDM may be applied to both the uplink and the downlink, or to either one of them.

[0219] In a wireless communication system, a slot configuration pattern for time division duplexing (TDD) may be set. For example, the slot configuration pattern may specify a pattern indicating the order of two or more slots among a slot for transmitting a downlink (DL) signal, a slot for transmitting an uplink (UL) signal, a slot in which a DL signal, a UL signal, and a guard symbol are mixed, and a slot in which a signal to be transmitted is changed to flexible.

[0220] In addition, in a wireless communication system, a demodulation reference signal (DMRS) can be used for each slot to perform channel estimation of a PUSCH (or a PUCCH (Physical Uplink Control Channel)), and further, a DMRS allocated to each of multiple slots can be used to perform channel estimation of a PUSCH (or a PUCCH). Such channel estimation may be called joint channel estimation, or may be called by another name such as cross-slot channel estimation.

[0221] The terminal 20 may transmit, in multiple slots, the DMRS allocated to each of the multiple slots so that the base station 10 can perform joint channel estimation using the DMRS.

[0222] Furthermore, in the wireless communication system, an enhanced function may be added to the feedback function from the terminal 20 to the base station 10. For example, an enhanced function may be added to the feedback of the terminal regarding HARQ-ACK.

[0223] Next, the configurations of the base station 10 and the terminal 20 will be described. Note that the configurations of the base station 10 and the terminal 20 described below are examples of functions related to this embodiment. The base station 10 and the terminal 20 may have functions not shown. Furthermore, the functional divisions and / or names of the functional units are not limited as long as the functions perform the operations related to this embodiment.

[0224] <Base station configuration> 13 is a block diagram showing an example of the configuration of base station 10 according to this embodiment. Base station 10 includes, for example, a transmitting unit 101, a receiving unit 102, and a control unit 103. Base station 10 communicates with terminal 20 (see FIG. 14) wirelessly.

[0225] The transmitter 101 transmits a downlink (DL) signal to the terminal 20. For example, the transmitter 101 transmits the DL signal under the control of the controller 103.

[0226] The DL signal may include, for example, a downlink data signal and control information (e.g., Downlink Control Information (DCI)). The DL signal may also include information indicating scheduling related to signal transmission of terminal 20 (e.g., an UL grant). The DL signal may also include control information of higher layers (e.g., control information of Radio Resource Control (RRC)). The DL signal may also include a reference signal.

[0227] Channels used for transmitting DL signals include, for example, data channels and control channels. For example, the data channels may include a PDSCH (Physical Downlink Shared Channel), and the control channels may include a PDCCH (Physical Downlink Control Channel). For example, the base station 10 transmits control information to the terminal 20 using the PDCCH and transmits downlink data signals using the PDSCH.

[0228] The reference signal included in the DL signal may include at least one of a demodulation reference signal (Demodulation Reference Signal (DMRS)), a Phase Tracking Reference Signal (PTRS), a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information. For example, reference signals such as DMRS and PTRS are used for demodulating downlink data signals and are transmitted using the PDSCH.

[0229] The receiving unit 102 receives an uplink (UL) signal transmitted from the terminal 20. For example, the receiving unit 102 receives the UL signal under the control of the control unit 103.

[0230] The control unit 103 controls the communication operations of the base station 10, including the transmission processing of the transmission unit 101 and the reception processing of the reception unit .

[0231] For example, the control unit 103 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 101. The control unit 103 also outputs the data, control information, etc. received from the receiving unit 102 to the upper layer.

[0232] For example, the control unit 103 allocates resources (or channels) used for transmitting and receiving DL signals and / or resources used for transmitting and receiving UL signals based on signals (for example, data and control information, etc.) received from the terminal 20 and / or data and control information, etc. acquired from a higher layer. Information on the allocated resources may be included in control information transmitted to the terminal 20.

[0233] Control unit 103 sets PUCCH resources as an example of allocation of resources used for transmitting and receiving UL signals. Information related to PUCCH configuration such as a PUCCH cell timing pattern (PUCCH configuration information) may be reported to terminal 20 by RRC.

[0234] <Device configuration> 14 is a block diagram showing an example of the configuration of terminal 20 according to this embodiment. Terminal 20 includes, for example, a receiving unit 201, a transmitting unit 202, and a control unit 203. Terminal 20 communicates with base station 10, for example, wirelessly.

[0235] The receiving unit 201 receives a DL signal transmitted from the base station 10. For example, the receiving unit 201 receives the DL signal under the control of the control unit 203.

[0236] The transmitter 202 transmits the UL signal to the base station 10. For example, the transmitter 202 transmits the UL signal under the control of the controller 203.

[0237] The UL signal may include, for example, an uplink data signal and control information (e.g., UCI). For example, information related to the processing capability of the terminal 20 (e.g., UE capability) may be included. The UL signal may also include a reference signal.

[0238] Channels used for transmitting UL signals include, for example, data channels and control channels. For example, the data channels include a PUSCH (Physical Uplink Shared Channel), and the control channels include a PUCCH (Physical Uplink Control Channel). For example, terminal 20 receives control information from base station 10 using the PUCCH and transmits uplink data signals using the PUSCH.

[0239] The reference signals included in the UL signal may include, for example, at least one of DMRS, PTRS, CSI-RS, SRS, and PRS. For example, the reference signals such as DMRS and PTRS are used for demodulating the uplink data signal and are transmitted using an uplink channel (for example, PUSCH).

[0240] The control unit 203 controls the communication operations of the terminal 20, including the reception processing in the reception unit 201 and the transmission processing in the transmission unit 202.

[0241] For example, the control unit 203 acquires information such as data and control information from a higher layer and outputs it to the transmitting unit 202. Also, the control unit 203 outputs, for example, the data and control information received from the receiving unit 201 to the higher layer.

[0242] For example, the control unit 203 controls transmission of information to be fed back to the base station 10. The information to be fed back to the base station 10 may include, for example, HARQ-ACK, Channel State Information (CSI), or a Scheduling Request (SR). The information to be fed back to the base station 10 may be included in UCI. The UCI is transmitted in the resources of the PUCCH.

[0243] Control unit 203 configures PUCCH resources based on configuration information (for example, configuration information such as a PUCCH cell timing pattern and / or DCI notified by RRC) received from base station 10. Control unit 203 determines PUCCH resources to be used for transmitting information to be fed back to base station 10. Under the control of control unit 203, transmission unit 202 transmits the information to be fed back to base station 10 in the PUCCH resources determined by control unit 203.

[0244] Note that the channel used for transmitting the DL signal and the channel used for transmitting the UL signal are not limited to the above-mentioned examples. For example, the channel used for transmitting the DL signal and the channel used for transmitting the UL signal may include a Random Access Channel (RACH) and a Physical Broadcast Channel (PBCH). The RACH may be used to transmit Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), for example.

[0245] The receiving unit 203 may receive a control signal. The control signal may be, for example, a signal for controlling PUCCH carrier switching, and may be a signal such as DCI, MAC CE, and / or RRC. Furthermore, the control signal may be, for example, a signal for controlling PUCCH repetition, and may be a signal such as DCI, MAC CE, and / or RRC.

[0246] The control unit 203 may control (determine) switching of a carrier for transmitting an uplink control signal and repeated transmission of the uplink control signal, based on the control signal received by the receiving unit 203. The uplink control signal may be, for example, a PUCCH. The carrier switching may be, for example, quasi-static carrier switching or dynamic carrier switching. The repeated transmission may be slot-based repeated transmission, sub-slot-based repeated transmission, or dynamic repeated transmission. More specifically, the repeated transmission may be slot-based PUCCH repetition, sub-slot-based PUCCH repetition, or dynamic PUCCH repetition transmission.

[0247] The control unit 203 does not need to assume that both the switching of the carrier for the uplink control signal and the repeated transmission of the uplink control signal are performed simultaneously. The control unit 203 may assume that both the switching of the carrier for the uplink control signal and the repeated transmission of the uplink control signal are performed simultaneously.

[0248] The present disclosure has been described above.

[0249] <Hardware configuration, etc.> The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0250] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0251] For example, a base station, a terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 15 is a diagram showing an example of the hardware configuration of a base station and a terminal according to this embodiment. The above-described base station 10 and terminal 20 may 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.

[0252] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0253] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and the memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0254] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 103 and control unit 203 may be realized by the processor 1001.

[0255] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 203 of the terminal 20 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0256] The memory 1002 is a computer-readable recording medium and may be configured, for example, by 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), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0257] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0258] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitter 101, receiver 102, receiver 201, transmitter 202, etc. may be realized by the communication device 1004.

[0259] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0260] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0261] Furthermore, base station 10 and terminal 20 may 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0262] <Information notification, signaling> The notification of information is not limited to the embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0263] <Applicable systems> The embodiments described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other suitable systems, and next-generation systems enhanced based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0264] <Processing procedures, etc.> The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0265] <Base station operation> In the present disclosure, a specific operation described as being performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0266] <Input / output direction> Information, etc. (see the section on information and signals) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may also be input and output via multiple network nodes.

[0267] <Handling of input and output information> Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0268] <Judgment method> The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0269] <Variations in form, etc.> Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0270] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0271] <Software> Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0272] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0273] <Information, Signals> The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0274] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0275] <System, Network> As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0276] <parameter, channel name> Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0277] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0278] <Base station> In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0279] A base station can accommodate one or more (e.g., 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 be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0280] <Mobile station> In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0281] A mobile station may also be referred to by those skilled in the art 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, handset, user agent, mobile client, client, or some other suitable terminology.

[0282] <Base station / mobile station> At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0283] Furthermore, a base station in the present disclosure may be read as a terminal. For example, the embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0284] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station 10 may be configured to have the functions of the terminal 20 described above.

[0285] <Terminology and interpretation> As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0286] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0287] <Reference signal> The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0288] <The meaning of "based on"> As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0289] <"First", "Second"> As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0290] <Means> In the configurations of each of the above devices, the "means" may be replaced with "section", "circuit", "device", etc.

[0291] <Open format> In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0292] <Time units such as TTI, frequency units such as RB, radio frame configuration> A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0293] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate at least one of, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0294] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0295] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0296] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0297] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0298] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0299] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a 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.

[0300] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0301] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0302] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0303] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0304] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0305] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0306] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0307] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0308] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0309] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0310] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0311] <Maximum transmission power> The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0312] <Article> In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0313] <"Different"> In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different." [Industrial Applicability]

[0314] One aspect of the present disclosure is useful in wireless communication systems. [Explanation of symbols]

[0315] 10 base station 20 terminals 101,202 Transmitter 102,201 Receiver 103,203 Control unit

Claims

1. a receiver for receiving downlink control information that triggers a retransmission of a first acknowledgment codebook in a specific slot; a control unit for controlling retransmission of the first acknowledgment codebook; Equipped with When transmitting a second acknowledgment codebook having second acknowledgment information of the same priority as the priority specified by the downlink control information in the specific slot, the control unit appends the first acknowledgment codebook to the second acknowledgment codebook. Terminal.

2. a transmitter configured to transmit the first acknowledgment codebook and the second acknowledgment codebook via an uplink control channel in the specific slot. The terminal of claim 1.

3. the second acknowledgement codebook is a Type 1 / 2 HARQ codebook for initial transmission; The terminal of claim 1.

4. the second acknowledgement codebook is a Type 3 HARQ codebook; The terminal of claim 1.

5. the control unit executes a procedure for postponing transmission of acknowledgement information for a downlink shared channel of SPS (Semi-persistent Scheduling); If the postponed acknowledgment information has the same priority as the priority indicated by the downlink control information, the control unit adds the postponed acknowledgment information to the second acknowledgment information in the specific slot. The terminal according to claim 1 .

6. a transmitter for transmitting downlink control information for triggering a retransmission of a first acknowledgment codebook in a specific slot; a receiving unit that receives the first acknowledgment codebook retransmitted based on the downlink control information; Equipped with When the second acknowledgment information included in the second acknowledgment codebook has the same priority as the priority specified by the downlink control information, the receiving unit receives the first acknowledgment codebook to which the second acknowledgment codebook has been added in the specific slot. Base station.

7. a base station transmitting downlink control information triggering a retransmission of a first acknowledgement codebook in a specific slot; a terminal that receives the downlink control information and controls retransmission of the first acknowledgment codebook; Equipped with When transmitting a second acknowledgment codebook having second acknowledgment information of the same priority as the priority specified by the downlink control information in the specific slot, the terminal appends the first acknowledgment codebook to the second acknowledgment codebook. system.

8. The device is receiving downstream control information triggering a retransmission of a first acknowledgment codebook in a particular slot; Controlling retransmission of the first acknowledgment codebook; When a second acknowledgement codebook having second acknowledgement information of the same priority as the priority designated by the downlink control information is transmitted in the specific slot, the first acknowledgement codebook is added to the second acknowledgement codebook. Communication method.

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