User terminal and wireless communication method

Abstract

One embodiment of a user terminal of the present invention comprises: a receiving unit that receives downlink shared channels respectively transmitted from a plurality of transmission and reception points; and a control unit that controls to apply the same type of delivery confirmation signal codebook to a plurality of retransmission control information for each downlink shared channel, and to transmit the plurality of retransmission control information by including the plurality of retransmission control information in the same delivery confirmation signal codebook.

Description

Technical Field

[0001] The present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system. Background Art

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

[0003] The subsequent systems of LTE (for example, also called fifth generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] In existing LTE systems (eg, 3GPP Rel. 8-14), user equipment (UE) controls the transmission of a physical uplink shared channel (eg, Physical Uplink Shared Channel (PUSCH)) and the reception of a downlink shared channel (eg, Physical Downlink Control Channel (PDSCH)) based on downlink control information (DCI).

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In future wireless communication systems (such as NR), one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) are being studied to perform DL transmission to user terminals (User Equipment (UE)).

[0010] However, multiple TRPs have not been considered in the NR standards to date. Therefore, when using multiple TRPs, there has been insufficient research on how to control the transmission of UL signals (such as uplink control channels, etc.).

[0011] Therefore, one of the objects of the present disclosure is to provide a user terminal and a wireless communication method that can appropriately implement UL transmission even when using multiple TRPs.

[0012] Means for solving problems

[0013] One mode of the user terminal of the present invention is characterized in that it has: a receiving unit that receives downlink shared channels respectively transmitted from a plurality of transmission and reception points; and a control unit that controls to apply the same type of delivery confirmation signal codebook to a plurality of retransmission control information for each downlink shared channel so that the plurality of retransmission control information are included in the same delivery confirmation signal codebook and transmitted.

[0014] Effects of the Invention

[0015] According to the present invention, UL transmission can be properly implemented even when multiple TRPs are used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A to Figure 1C This is a diagram showing an example of a multi-TRP scenario.

[0017] Figure 2A to Figure 2C This is a diagram showing an example of a slot-level HARQ-ACK timing value.

[0018] Figure 3 2 is a diagram showing a first example of a semi-static codebook determination operation at a slot level.

[0019] Figure 4 2 is a diagram showing a second example of the semi-static codebook determination operation at a time slot level.

[0020] Figure 5 3 is a diagram showing a third example of the semi-static codebook determination operation at a time slot level.

[0021] Figure 6 This is a diagram showing an example of the configuration of PDSCH reception candidate timings.

[0022] Figure 7 This is a diagram showing an example of joint HARQ-ACK feedback control according to the first embodiment.

[0023] Figure 8 This is a diagram showing another example of joint HARQ-ACK feedback control according to the first embodiment.

[0024] Fig. 9 This is a diagram showing another example of joint HARQ-ACK feedback control according to the first embodiment.

[0025] Fig.10 This is a diagram showing another example of joint HARQ-ACK feedback control according to the first embodiment.

[0026] Fig.11 This is a diagram showing an example of determining the sub-codebook of each TRP.

[0027] Fig.12 This is a diagram showing an example of joint HARQ-ACK feedback control according to the second method.

[0028] Fig.13 This is a diagram showing another example of joint HARQ-ACK feedback control according to the second embodiment.

[0029] Fig.14 This is a diagram showing another example of joint HARQ-ACK feedback control according to the second embodiment.

[0030] Fig.15A as well as Fig. 15B This is a diagram showing an example of TRP determination based on CORESET.

[0031] Fig.16A as well as Fig. 16B This is a diagram showing an example of TRP determination based on sequence ID.

[0032] Fig.17 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0033] Fig.18 This is a diagram showing an example of the structure of a base station involved in one embodiment.

[0034] Fig.19 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0035] Fig. 20 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment. DETAILED DESCRIPTION

[0036] (Multiple TRP)

[0037] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) are being studied to use one or more panels (multi-panels) to perform DL transmission (such as PDSCH transmission) to the UE. In addition, in this specification, the transmission / reception point (TRP) can also be replaced by a transmission point, a reception point, a panel, a cell, a serving cell, a carrier or a component carrier (CC).

[0038] Figures 1A to 1C This is a diagram showing an example of a multi-TRP scenario. Figures 1A to 1C It is assumed that each TRP can send 4 different beams, but it is not limited to this. Figures 1A to 1C In the example, each TRP is assumed to have one panel, but one TRP may also have multiple panels, and the reception of PDSCH from each of the multiple panels is controlled by PDCCH from a single panel or multiple panels.

[0039] Figure 1A This shows an example of a situation where only one TRP (TRP1 in this example) among multiple TRPs sends a control signal (e.g., a downlink control channel (Physical Downlink Control Channel (PDCCH))) to the UE, and the multiple TRPs send a data signal (e.g., a downlink shared channel (Physical Downlink Shared Channel (PDSCH))).

[0040] For example, Figure 1AIn the example, UE receives PDSCH1 and PDSCH2 sent from TRP1 and TRP2 respectively based on one PDCCH (DCI) from TRP1. In this way, scheduling of PDSCHs from multiple TRPs using PDCCH (DCI) from a single TRP is also referred to as single DCI, single PDCCH, single master mode, PDCCH type A (first PDCCH type) or DMRS port group type A (first DMRS port group type), etc.

[0041] Figure 1B This represents an example of a situation in which each of the multiple TRPs sends its own control signal (e.g., PDCCH) to the UE, and the multiple TRPs each send a data signal (e.g., PDSCH).

[0042] For example, Figure 1B In 1C, the UE receives PDSCH1 and PDSCH2 sent from TRP1 and TRP2, respectively, based on PDCCH (DCI) 1 and PDCCH2 sent from TRP1 and TRP2, respectively. In this way, the scheduling of PDSCH from multiple TRPs using PDCCH (DCI) from multiple TRPs is also called multiple DCI, multiple PDCCH, multi-master mode, etc.

[0043] In multiple PDCCHs, such as Figure 1B As shown, the multiple TRPs (such as TRP1 and TRP2) can be connected through an ideal backhaul or a non-ideal backhaul with low latency. Figure 1B The scenario shown is also referred to as PDCCH type B (second PDCCH type) or DMRS port group type B (second DMRS port group type) or the like.

[0044] Or, in multiple PDCCHs, such as Figure 1C As shown, the multiple TRPs (eg, TRP1 and TRP2) may also be connected via a non-ideal backhaul with large latency. Figure 1C The scenario shown is also referred to as PDCCH type C (third PDCCH type) or DMRS port group type C (second DMRS port group type) or the like.

[0045] In a multi-TRP scenario such as the one above, the transmission of non-coherent DL signals (such as PDSCH) from multiple TRPs is being studied. The transmission of non-coherent DL signals (or DL ​​channels) coordinated from multiple TRPs is also called NCJT (Non-Coherent Joint Transmission).

[0046] For example, from the multiple TRPs, PDSCH corresponding to the same codeword (CW) may be sent using different layers. For example, PDSCH1 corresponding to CW1 may be sent from TRP1 using a specific number of layers (e.g., layer 1 and layer 2), and PDSCH2 corresponding to CW1 may be sent from TRP2 using a specific number of layers (e.g., layer 3 and layer 4).

[0047] Alternatively, PDSCHs corresponding to different CWs may be sent from the multiple TRPs. For example, PDSCH1 corresponding to CW1 may be sent from TRP1, and PDSCH2 corresponding to CW2 may be sent from TRP2. In addition, CW may also be replaced by a transport block (TB).

[0048] The multiple PDSCHs for NCJT may also be assumed to not have a quasi-co-located (Quasi-Co-Location (QCL)) relationship. In addition, the multiple PDSCHs for NCJT may also be defined to partially or completely overlap with respect to at least one of the time domain and the frequency domain.

[0049] In a multi-TRP scenario such as the one described above, the problem arises as to how to control the transmission of uplink control information (e.g., also called UCI). UCI includes HARQ-ACK corresponding to PDSCH, channel state information (CSI) calculated based on DL reference signals, and the like.

[0050] For example, when a UE receives a PDSCH ( Figures 1A to 1C In the case of PDSCH1 and PDSCH2 in the transmission, how to send HARQ-ACK1 for PDSCH1 and HARQ-ACK2 for PDSCH2 becomes a problem. HARQ-ACK can also be replaced by at least one of HARQ-ACK payload, HARQ-ACK feedback, ACK / NACK payload, and ACK / NACK feedback.

[0051] As the transmission of multiple HARQ-ACKs, it is considered to separate and transmit the multiple HARQ-ACKs. For example, the transmission of HARQ-ACK1 for PDSCH1 and the transmission of HARQ-ACK2 for PDSCH2 are controlled separately. The method of separately controlling the transmission of HARQ-ACK1 and HARQ-ACK2 can also be called separate ACK / NACK feedback.

[0052] On the other hand, in certain situations, it is preferable to simultaneously control the transmission of HARQ-ACK1 for PDSCH1 and HARQ-ACK2 for PDSCH2. The method of simultaneously controlling the transmission of HARQ-ACK1 and HARQ-ACK2 may also be called joint ACK / NACK feedback.

[0053] In a multi-TRP scenario, in a situation where the PDSCH of each TRP is scheduled through one PDCCH (or DCI), and in a situation where multiple TRPs are connected through an ideal backhaul or a low-latency non-ideal backhaul, joint ACK / NACK feedback is preferably applied. In these situations, by simultaneously sending HARQ-ACK to each TRP, the transmission control of HARQ-ACK (such as resource assignment, etc.) can be simplified and the throughput can be improved. Of course, the situations in which joint ACK / NACK feedback can be applied are not limited to this.

[0054] However, in a multi-TRP scenario, how to control the joint ACK / NACK feedback (or the joint ACK / NACK payload) has not been fully studied.

[0055] The inventors of the present invention focus on applying the same type of HARQ-ACK codebook to HARQ-ACKs (e.g., HARQ-ACK1 and HARQ-ACK2) corresponding to different TRPs in joint ACK / NACK feedback. For example, for HARQ-ACKs corresponding to different TRPs, either a semi-statically configured type 1 HARQ-ACK codebook or a dynamically configured type 2 HARQ-ACK codebook is applied to perform joint ACK / NACK feedback.

[0056] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each method of the present embodiment may be applied separately or in combination. In addition, in the following description, it is assumed that a semi-statically set type 1 HARQ-ACK codebook (also called a semi-static codebook) is applied to HARQ-ACK corresponding to different TRPs, but it is not limited to this.

[0057] In addition, in the present embodiment, TRP, panel, Uplink (UL) transmitting entity, antenna port (DMRS port) of demodulation reference signal (DeModulation Reference Signal (DMRS)), group of DMRS ports (DMRS port), group of DMRS ports for code division multiplexing (Code Division Multiplexing (CDM)) (CDM group), control resource set (Control Resource Set (CORESET)), search space set, PDSCH, codeword, base station, etc. can also be replaced with each other.

[0058] In addition, panel identifier (ID) and panel can also be replaced with each other. TRP ID and TRP can also be replaced with each other. In addition, cell ID and cell (serving cell) can also be replaced with each other. In addition, ID, index and number can also be replaced with each other.

[0059] In addition, in this embodiment, the cell ID may be replaced with the serving cell ID, serving cell index, carrier index, CC index or carrier identifier.

[0060] In addition, this embodiment can be applied to any communication system that uses multiple TRPs. For example, this embodiment can also be applied to a structure (NCJT) in which non-coherent DL signals (such as CW or TB) are transmitted in a coordinated manner from multiple TRPs, or a structure in which one DL signal (such as CW or TB) is repeatedly transmitted from multiple TRPs. In the repeated transmission, one CW or TB can also be repeatedly transmitted in at least one of the time domain, frequency domain, and spatial domain.

[0061] In addition, in the following, it is assumed that the multiple TRPs have the same cell ID, but this is not limited to this, and the present embodiment can also be applied to the case where the multiple TRPs have different cell IDs.

[0062] (First method)

[0063] In the first method, after determining the candidate PDSCH reception occasions (occasions for candidate PDSCH receptions, or candidate PDSCH reception occasions), at least one of the number of HARQ-ACK bits and the HARQ-ACK bit order is determined based on each candidate reception occasion. In the following description, the case where the TRP is 2 is used as an example for explanation, but the same can also be applied to more than 3 TRPs.

[0064] In a multi-TRP scenario, when type 1 (e.g., semi-static HARQ-ACK codebook) is set as the HARQ-ACK codebook type, the UE controls the joint ACK / NACK feedback based on the following steps 1 and 2.

[0065] In step 1, the UE determines a set of timings for PDSCH reception candidates. In step 2, the UE determines the total number of HARQ-ACK bits and the HARQ-ACK bit order based on a specific rule.

[0066] <Step 1>

[0067] The UE determines a set of candidate PDSCH reception timings. The UE may also determine the candidate PDSCH reception timings using the operations defined in Rel.15 of 5G (or NR).

[0068] For example, the UE determines the M for PDSCH reception candidates based on specific rules. A,c a set of M A,c The set of occasions for candidate PDSCH receptions may also correspond to the HARQ-ACK sent in a specific time slot n.

[0069] The set of timings for PDSCH reception candidates may be determined based on at least one of the following conditions (1) to (4).

[0070] (1) HARQ-ACK timing value (K1)

[0071] (2) PDSCH resource allocation table

[0072] (3) The ratio of the subcarrier spacing of DL transmissions (e.g., PDSCH) to the subcarrier spacing of UL transmissions (e.g., PUCCH)

[0073] (4) UL / DL configuration set by the network (e.g., base station)

[0074] The HARQ-ACK timing value (K1) may be a value notified through DCI, or a value set through higher layer signaling (eg, dl-DataToUL-ACK).

[0075] The PDSCH resource allocation table may also be a table that specifies the association between the time slot offset (K0), the start and length of the PDSCH, and the mapping type of the PDSCH (PDSCH time domain resource allocation table). For example, for each row index (Row index (RI)) of the PDSCH resource allocation table, the association between a specific time slot offset (K0), the start and length of the PDSCH, and the mapping type of the PDSCH may be specified, and the timing of the PDSCH reception candidate corresponding to each RI may be assumed.

[0076] The UL / DL configuration configured by the base station may also be configured through higher layer signaling (eg, at least one of TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated).

[0077] Specifically, the UE may also determine, based on the at least one parameter, in the serving cell c (or the activated downlink BWP and uplink BWP of the serving cell c), a set of candidate PDSCH reception opportunities in which the HARQ-ACK bit can be sent in the PUCCH sent in time slot n. For example, the UE may also determine the candidate PDSCH reception opportunities (M) according to the following steps (1) and (2). A,c )'s collection.

[0078] Step (1)

[0079] The UE determines the HARQ-ACK window based on the HARQ-ACK timing value K1 at the time slot level. For example, Figure 2A In the example, the HARQ-ACK window for the HARQ-ACK bits sent in time slot #n is determined to be time slot #n-K1 (K1=2, 3, 4). The HARQ-ACK window can also be called the cardinality of the set C(K1) of HARQ-ACK timing values ​​K1. For example, Figure 2A In this case, C(K1)={7,6,5}.

[0080] In addition, C(K1) including one or more HARQ-ACK timing values ​​K1 may be determined based on at least one of a specific field value in the DCI and a higher-layer parameter (eg, dl-DataToUL-ACK).

[0081] Step (2)

[0082] The UE may also determine the candidate PDSCH reception timing in each time slot for each HARQ-ACK timing value K1 in C(K1). The UE may also repeat the following steps (2-1) and (2-2) for each HARQ-ACK timing value K1 in C(K1) to determine the semi-static HARQ-ACK codebook to be sent in time slot #n.

[0083] Step (2-1)

[0084] The UE may also determine a PDSCH reception candidate opportunity that can be used in time slot #n-K1 based on at least one of the PDSCH time domain RA table and the format of time slot #n-K1 corresponding to the HARQ-ACK timing value K1. The PDSCH reception candidate opportunity may also be a period (also referred to as an opportunity, candidate opportunity, etc.) that is one or more candidates for receiving the PDSCH.

[0085] Specifically, the UE may also determine the PDSCH reception candidate timings for time slot #n-K1 based on the PDSCH time domain RA table, and then exclude at least part of the PDSCH reception candidate timings as unusable based on the format of time slot #n-K1 (or, may extract at least part of the PDSCH reception candidate timings as usable based on the format of time slot #n-K1).

[0086] In addition, the format of time slot #n-K1 can also be determined based on at least one of a cell-specific TDD UL / DL structure (eg, the above-mentioned TDD-UL-DL-ConfigurationCommon), a time slot-specific TDD UL / DL structure (eg, TDD-UL-DL-ConfigDedicated), and DCI.

[0087] Step (2-2)

[0088] The UE assigns an index to the PDSCH reception candidate timing determined in step (2-1). The UE may assign the same index (value) to a plurality of PDSCH reception candidate timings in which at least some symbols overlap, and generate a HARQ-ACK bit for each index (value) of the PDSCH reception candidate timing.

[0089] Below, refer to Figure 2B , 2C as well as Figure 3 to Figure 5 , the example shows that the set C(K1) of HARQ-ACK timing values ​​K1 includes 7, 6, and 5 (refer to Figure 2A An example of determining the static HARQ-ACK codebook under ).

[0090] Figure 2BAn example of a PDSCH time domain RA table is shown in FIG. Figure 2B As shown in FIG. 1 , in the PDSCH time domain RA table, for example, a row index (RI) may be associated with at least one of an offset K0, an index S of a start symbol to which the PDSCH is allocated, a number of symbols (allocation length) L to which the PDSCH is allocated, and a mapping type of the PDSCH. Each row of the PDSCH time domain RA table may also represent a PDSCH time domain RA (i.e., a candidate PDSCH reception opportunity) for the PDSCH.

[0091] Figure 2C In, it means based on Figure 2B An example of a PDSCH reception candidate timing determined by the PDSCH time domain RA table. Figure 2B In the PDSCH time domain RA table, when RI=0, K0=0, S=2, L=4, so the PDSCH reception candidate timing determined based on RI=0 consists of 4 symbols starting from symbol #2 of time slot #n-K1 (i.e., symbols #2 to #5). Similarly, Figure 2C , candidate PDSCH reception timings determined based on RI=1 to 8 are indicated.

[0092] <When K1 = 7>

[0093] Figure 3 , the format in which time slot #n-K1 is composed entirely of downlink symbols (D) is shown. Figure 2A In time slot #n-7), all PDSCH reception candidate timings determined based on RI=0 to 8 can be used.

[0094] Therefore, if Figure 3 As shown, all PDSCH reception candidate timings determined based on RI=0 to 8 are extracted, and indexes (identifiers or IDs) are given to the extracted PDSCH reception candidate timings. Here, the same index may be given to a plurality of PDSCH reception candidate timings in which at least some symbols overlap (collide).

[0095] For example, Figure 3 In the example, the three PDSCH reception candidate timings determined based on RI=0, 3, and 4 have some overlapping symbols, so these PDSCH reception candidate timings are assigned the same index "0". Similarly, the two PDSCH reception candidate timings determined based on RI=2 and 7 have some overlapping symbols, so these PDSCH reception candidate timings are assigned the same index "3".

[0096] The candidate PDSCH reception opportunities in slot #n-K1 include candidate PDSCH reception opportunities identified by different indices (values) “0” to “4.” The UE may generate a specific number (eg, 1 bit) of HARQ-ACK bits for the candidate PDSCH reception opportunities of each index.

[0097] For example, Figure 3 In the example, a UE can use 5 PDSCH reception candidate opportunities in time slot #n-K1, so a semi-static HARQ-ACK codebook containing 5 HARQ-ACK bits can also be generated.

[0098] <When K1 = 6>

[0099] Figure 4 In FIG. 1 , it is shown that the time slot #n-K1 includes a downlink symbol (D), an uplink symbol (U), and a guard period (G). For example, Figure 4 In time slot #n-K1 (e.g. Figure 2A In time slot #n-5), symbols #0 to #9 are downlink symbols, symbols #12 and #13 are uplink symbols, and symbols #10 and #11 are protection periods.

[0100] exist Figure 4 In the case shown, candidate PDSCH reception opportunities including uplink symbols #12 and #13 (e.g., candidate PDSCH reception opportunities determined based on RI=2, 3, 8) cannot be used in slot #n-K1. This is because the UE cannot receive PDSCH in uplink symbols #12 and #13.

[0101] Therefore, if Figure 4 As shown, candidate PDSCH reception opportunities determined based on RI=2, 3, and 8 are excluded, all candidate PDSCH reception opportunities determined based on RI=0, 1, 4 to 7 are extracted, and indexes (identifiers or IDs) are given to the extracted candidate PDSCH reception opportunities.

[0102] In addition, the index may also be assigned in sequence within the set C(K1) of HARQ-ACK timing values ​​K1. Figure 3 As described in , when K1=7, the PDSCH reception candidate timings in slot #n-K1 are assigned indices "0" to "4". Figure 4 In the case of K1=6 shown, subsequent indices "5" to "8" may be assigned to the PDSCH reception candidate timings in slot #n-K1.

[0103] In addition, as described above, the same index may be given to a plurality of PDSCH reception candidate timings in which at least some of the symbols overlap (collide). Figure 4 In , two PDSCH reception candidate timings determined based on RI=0 and 4 have partial symbol overlap, so the same index "0" is assigned to these PDSCH reception candidate timings. Similarly, the same index "6" is assigned to the two PDSCH reception candidate timings determined based on RI=1 and 5.

[0104] Like this, the semi-static HARQ-ACK codebook corresponding to the PDSCH reception candidate opportunity in the UE in time slot #n-K1 (K1=7, 6) may also include a specific number (e.g., 9 bits) of HARQ-ACK bits corresponding to the candidate PDSCH reception opportunities identified by different indices (values) "0" to "8".

[0105] <When K1 = 6>

[0106] Figure 5 In the example, the format in which time slot #n-K1 is composed entirely of uplink symbols (U) is shown. Figure 5 In time slot #n-K1 (e.g. Figure 2A All code elements #0 to #13 in time slot #n-5) are uplink code elements.

[0107] exist Figure 5 In the case shown in FIG. 1 , all candidate PDSCH reception opportunities determined based on RI=0 to 8 cannot be used in time slot #n-K1. Figure 5 As shown in FIG. 1 , it is also possible not to extract the candidate PDSCH reception opportunities that can be used in time slot #n-K1. Figure 5 The HARQ-ACK bits corresponding to time slot #n-K1 (K1=5) shown may also not be included in the semi-static HARQ-ACK codebook corresponding to C(K1)=7, 6, 5.

[0108] <Step 2>

[0109] For each CC (or specific CC), the UE considers specific conditions (or specific rules) to determine the total number of HARQ-ACK bits and the order of HARQ-ACK bits. In addition, the UE may also determine the number of HARQ-ACK bits and the order of HARQ-ACK bits corresponding to each PDSCH reception candidate.

[0110] The specific condition may also be at least one of whether or not retransmission in code block group (CBG) units is applied, the maximum number of code words (CW) for each TRP, and whether or not spatial bundling between TRPs is applied. Whether or not retransmission in CBG units is applied, the maximum number of CWs (or TBs) for each TRP, or whether or not spatial bundling between TRPs is applied may also be set from the network to the UE through higher layer signaling or the like.

[0111] CBG is a group of more than one CB, which is a smaller unit than a transport block (TB). When the UE is not configured to apply retransmission in CBG units, HARQ-ACK is sent in TB units even if the TB consists of multiple CBs. In this case, retransmission is also required for CBs where no error is detected (decoding is successful).

[0112] On the other hand, when the UE is set to use the retransmission application of the CBG unit, it is not possible to send HARQ-ACK in TB units, but to send HARQ-ACK in CBG units. In this case, it is possible to set a structure in which no retransmission is performed for CBs for which no error is detected (decoding is successful). Therefore, the UE controls the number of HARQ-ACK bits and the bit order of HARQ-ACK based on the presence or absence of the retransmission application of the CBG unit (or the presence or absence of the setting).

[0113] Hereinafter, as specific conditions, the following cases 1 to 4 will be described as examples. In addition, the present aspect can also be applied to cases other than the following cases.

[0114] In the following description, it is assumed that CC0 and CC1 are set in TRP#1 and TRP#2, respectively. In addition, it is assumed that HARQ-ACK (HARQ-ACK corresponding to K1=4, 3, 2, 1, respectively) for multiple PDSCHs are sent in time slot n (UL) of each cell (refer to Figure 6 ). In addition, the value of K1 may also be set through at least one of higher layer signaling (eg, dl-DataToUL-ACK) and DCI.

[0115] Here, K1=4 to 1 indicates a case where each corresponds to one PDSCH reception candidate timing. Of course, as shown in step 1 above, a plurality of PDSCH reception candidate timings may be set for each K1, or a different number of PDSCH reception candidate timings may be set for each K1.

[0116] In addition, here, the PDSCH reception candidate timing indexes corresponding to K1=4~1 of CC0 are 0~3, and the PDSCH reception candidate timing indexes corresponding to K1=4~1 of CC1 are 4~7. The PDSCH reception candidate timing indexes are numbered based on the CC index, but are not limited to this. The PDCCH reception candidate timing can also be set for each TRP.

[0117] [Scenario 1]

[0118] In case 1, the following conditions are set.

[0119] Resend in CBG units: Not applied (or not set)

[0120] Maximum number of CWs per TRP: 1

[0121] Spatial bundling between TRPs: Not applied (or not set)

[0122] In the above case, an M-bit HARQ-ACK is generated in each PDSCH reception candidate opportunity. M is equivalent to the number of TRPs (or panels, PDSCHs, antenna port groups, DMRS port groups, RS association groups), and each HARQ-ACK bit corresponds to 1 TRP.

[0123] Figure 7 This represents the case of jointly feeding back HARQ-ACK for PDSCHs transmitted from two TRPs (M=2). In this case, the UE generates M (here, M=2) bits of HARQ-ACK for each PDSCH reception candidate timing determined in step 1 (here, 0 to 7).

[0124] That is, for the PDSCH reception candidate timing index 0 (K1=4) of a specific CC (e.g. CC0), a HARQ-ACK corresponding to TRP#0 and a HARQ-ACK corresponding to TRP#1 are generated. For other PDSCH reception candidate timing indices 1 to 3 (K1=3 to 1), a HARQ-ACK corresponding to TRP#0 and a HARQ-ACK corresponding to TRP#1 are also generated.

[0125] In addition, for PDSCH reception candidate timing indices 4 to 7 (K1=4 to 1) of other CCs (eg, CC1), HARQ-ACK corresponding to TRP#0 and HARQ-ACK corresponding to TRP#1 are similarly generated.

[0126] In each PDSCH reception candidate opportunity, the bit order of the M-bit HARQ-ACK can also be determined based on the TRP index order. For example, the UE can also configure the M-bit HARQ-ACK corresponding to the PDSCH reception candidate opportunity index in the order of the corresponding TRP index from small to large or from low to high (in ascending order).

[0127] Alternatively, the M-bit HARQ-ACK corresponding to the PDSCH reception candidate timing index may be configured in descending order according to the corresponding TRP index.

[0128] In the case of multi-TRP scenario using multiple cells (or CCs), after performing the above steps 1 and 2 for each CC, the HARQ-ACK corresponding to multiple CCs can also be included in one HARQ-ACK codebook.

[0129] In this case, the bit order of HARQ-ACK can also be determined based on the CC index (or serving cell index) order. For example, after the UE performs step 2 for each CC, it can also configure the CC index in ascending order (see Figure 7 ). Alternatively, after performing step 2 for each CC, the UE may configure the CCs in descending order of the CC index (in ascending order).

[0130] in addition, Figure 7 In the example, the order of the HARQ-ACK bits in the HARQ-ACK codebook is determined based on the priority of the CC index, the PDSCH reception candidate timing index, and the TRP index. In addition, the priority order used to determine the order of the HARQ-ACK bits can also be appropriately changed for application.

[0131] [Scenario 2]

[0132] In case 2, the following conditions are set.

[0133] Resend in CBG units: Not applied (or not set)

[0134] Maximum number of CWs per TRP: 1

[0135] Spatial bundling between TRPs: application (or setting)

[0136] In the case described above, a 1-bit HARQ-ACK is generated in each PDSCH reception candidate timing. In this case, the HARQ-ACK bits corresponding to different TRPs of the same cell (or CC) are bundled (e.g., binary). For example, in CC0, "ACK" can be generated when both the HARQ-ACK of TRP#0 and the HARQ-ACK of TRP#1 corresponding to a specific PDSCH reception candidate timing (e.g., K1=4) are "ACK", and "NACK" can be generated in other cases.

[0137] Figure 8 This shows the case where HARQ-ACK for PDSCHs transmitted from two TRPs (M=2) is fed back jointly. In this case, the UE generates a 1-bit HARQ-ACK for each PDSCH reception candidate timing determined in step 1.

[0138] That is, for the PDSCH reception candidate timing index 0 (K1=4) of a specific CC (e.g., CC0), a HARQ-ACK is generated by bundling the HARQ-ACK of TRP#0 and the HARQ-ACK of TRP#1. Similarly, for other PDSCH reception candidate timing indices 1 to 3 (K1=3 to 1), a HARQ-ACK is generated by bundling the HARQ-ACK corresponding to TRP#0 and the HARQ-ACK corresponding to TRP#1.

[0139] In addition, for PDSCH reception candidate timing indices 4 to 7 (K1=4 to 1) of other CCs (eg, CC1), HARQ-ACK is similarly generated by bundling the HARQ-ACK corresponding to TRP#0 and the HARQ-ACK corresponding to TRP#1.

[0140] In the case of multi-TRP scenario using multiple cells (or CCs), after performing the above steps 1 and 2 for each CC, the HARQ-ACK corresponding to multiple CCs can also be included in one HARQ-ACK codebook.

[0141] In this case, the bit order of HARQ-ACK can also be determined based on the CC index (or serving cell index) order. For example, after the UE performs step 2 for each CC, it can also configure the CC index in ascending order (see Figure 8 ). Alternatively, after performing step 2 for each CC, the UE may configure the CCs in descending order of the CC index (in ascending order).

[0142] in addition, Figure 8 In the example, the order of the HARQ-ACK bits in the HARQ-ACK codebook is determined based on the priority of the CC index and the TRP index. In addition, the priority used to determine the order of the HARQ-ACK bits can also be appropriately changed for application.

[0143] [Scenario 3]

[0144] In case 3, the following conditions are set.

[0145] Resend in CBG units: Application (or setting)

[0146] Maximum number of CWs per TRP: 1

[0147] Spatial bundling between TRPs: Not applied (or not set)

[0148] In relevant cases, in each PDSCH reception candidate opportunity, M×N CBG / TB,max HARQ-ACKbits of HARQ-ACK. M is equivalent to the number of TRPs (or panels, PDSCHs, antenna port groups, DMRS port groups, RS association groups). N CBG / TB,max HARQ-ACK Equivalent to the maximum number of CBGs per transport block. N CBG / TB,max HARQ-ACK The base station may also notify the UE by using higher layer signaling or the like.

[0149] Fig. 9 This shows the case of joint feedback of HARQ-ACK for PDSCHs transmitted from two TRPs (M=2). CBG / TB,max HARQ-ACK = 2. In this case, the UE generates M×N CBG / TB,max HARQ-ACK (Here, 2×2) bits of HARQ-ACK.

[0150] That is, for the PDSCH reception candidate timing index 0 (K1=4) of a specific CC (e.g., CC0), HARQ-ACKs corresponding to CBG0 and CBG1 of TRP#0 and HARQ-ACKs corresponding to CBG0 and CBG1 of TRP#1 are generated. For other PDSCH reception candidate timing indices 1 to 3 (K1=3 to 1), HARQ-ACKs corresponding to CBG0 and CBG1 of TRP#0 and HARQ-ACKs corresponding to CBG0 and CBG1 of TRP#1 are also generated.

[0151] In addition, for PDSCH reception candidate timing indices 4 to 7 (K1=4 to 1) of other CCs (eg, CC1), HARQ-ACKs corresponding to CBG0 and CBG1 of TRP#0 and HARQ-ACKs corresponding to CBG0 and CBG1 of TRP#1 are also generated.

[0152] Among the candidate PDSCH reception opportunities, M×N CBG / TB,max HARQ-ACK The bit order of the HARQ-ACK of the bit can also be determined based on the TRP index order and the CBG index order. For example, the UE can also CBG / TB,max HARQ-ACK The HARQ-ACK bits of the bits are configured in ascending order according to the corresponding TRP index and CBG index (see Fig. 9 ). In addition, the TRP index may be prioritized over the CBG index, or the CBG index may be prioritized over the TRP index.

[0153] Alternatively, the M×N CBG / TB,max HARQ-ACK The HARQ-ACK bits of bits are configured in descending order according to the corresponding TRP index and CBG index.

[0154] In the case of multi-TRP scenario using multiple cells (or CCs), after performing the above steps 1 and 2 for each CC, the HARQ-ACK corresponding to multiple CCs can also be included in one HARQ-ACK codebook.

[0155] In this case, the bit order of HARQ-ACK can also be determined based on the CC index (or serving cell index) order. For example, after the UE performs step 2 for each CC, it can also configure the CC index in ascending order (see Fig. 9 ). Alternatively, after performing step 2 for each CC, the UE may configure the CCs in descending order of the CC index (in ascending order).

[0156] in addition, Fig. 9 In the example, the order of the HARQ-ACK bits in the HARQ-ACK codebook is determined based on the priority of the CC index, the PDSCH reception candidate timing index, the TRP index, and the CBG index. In addition, the priority order used to determine the order of the HARQ-ACK bits can also be appropriately changed for application.

[0157] [Case 4]

[0158] In case 4, the following conditions are set.

[0159] Resend in CBG units: Application (or setting)

[0160] Maximum number of CWs per TRP: 1

[0161] Spatial bundling between TRPs: Application (or setting)

[0162] In relevant cases, N is generated in each PDSCH reception candidate opportunity. CBG / TB,max HARQ-ACK HARQ-ACK of bits. CBG / TB,max HARQ-ACK Equivalent to the maximum number of CBGs per transport block. N CBG / TB,max HARQ-ACK The base station may also notify the UE by using higher layer signaling or the like.

[0163] The HARQ-ACK bits corresponding to different TRPs of the same cell (or CC) are bundled (e.g., binary). For example, in CC0, "ACK" may be generated when both the HARQ-ACK of TRP0 and the HARQ-ACK of TRP1 corresponding to CBG0 at a specific PDSCH reception candidate timing (e.g., K1=4) are "ACK", and "NACK" may be generated otherwise.

[0164] Fig.10 This shows the case of joint feedback of HARQ-ACK for PDSCHs transmitted from two TRPs (M=2). CBG / TB,max HARQ-ACK =2. In this case, the UE generates N for each PDSCH reception candidate timing determined in step 1. CBG / TB,max HARQ-ACK (Here, 2) bits of HARQ-ACK.

[0165] That is, for the PDSCH reception candidate timing index 0 (K1=4) of a specific CC (e.g. CC0), the HARQ-ACK corresponding to CBG0 of TRP#0 and the HARQ-ACK corresponding to CBG0 of TRP#1 are bundled. Similarly, the HARQ-ACK corresponding to CBG1 of TRP#0 and the HARQ-ACK corresponding to CBG1 of TRP#1 are bundled. For other PDSCH reception candidate timing indices 1 to 3 (K1=3 to 1), the HARQ-ACK corresponding to CBG0 of TRP#0 and CBG0 of TRP#1 are also bundled, and the HARQ-ACK corresponding to CBG1 of TRP#0 and CBG1 of TRP#1 are also bundled.

[0166] In addition, for PDSCH reception candidate timing indices 4 to 7 (K1=4 to 1) of other CCs (eg CC1), the HARQ-ACKs corresponding to CBG0 of TRP#0 and CBG0 of TRP#1 are also bundled, and the HARQ-ACKs corresponding to CBG1 of TRP#0 and CBG1 of TRP#1 are also bundled.

[0167] In each PDSCH reception candidate opportunity, N CBG / TB,max HARQ-ACK The bit order of the HARQ-ACK of the bit may also be determined based on the CBG index order. For example, the UE may also CBG / TB,max HARQ-ACK The HARQ-ACK bits of the bits are configured in ascending order according to the corresponding CBG index (see Fig.10 ).

[0168] Alternatively, N corresponding to the PDSCH reception candidate timing index may be CBG / TB,max HARQ-ACK The HARQ-ACK bits of the bits are configured in descending order according to the corresponding CBG index.

[0169] In the case of multi-TRP scenario using multiple cells (or CCs), after performing the above steps 1 and 2 for each CC, the HARQ-ACK corresponding to multiple CCs can also be included in one HARQ-ACK codebook.

[0170] In this case, the bit order of HARQ-ACK can also be determined based on the CC index (or serving cell index) order. For example, after the UE performs step 2 for each CC, it can also configure the CC index in ascending order (see Fig.10 ). Alternatively, after performing step 2 for each CC, the UE may configure the CCs in descending order of the CC index (in ascending order).

[0171] in addition, Fig.10 In the example, the order of the HARQ-ACK bits in the HARQ-ACK codebook is determined based on the priority of the CC index, the PDSCH reception candidate timing index, and the CBG index. In addition, the priority order used to determine the order of the HARQ-ACK bits can also be appropriately changed for application.

[0172] In this way, the HARQ-ACKs of each TRP corresponding to the same CBG are bundled, thereby suppressing the increase in the fed-back HARQ-ACK bits (or HARQ-ACK codebook size).

[0173] (Second method)

[0174] In the second method, after determining the HARQ-ACK codebook (also called HARQ-ACK subcodebook) for each TRP, the HARQ-ACK subcodebook is connected to form one HARQ-ACK codebook. In the following description, the case where the TRP is 2 is used as an example, but the same can be applied to more than 3 TRPs.

[0175] In a multi-TRP scenario, when type 1 (e.g., semi-static HARQ-ACK codebook) is set as the HARQ-ACK codebook type, the UE controls the joint ACK / NACK feedback based on the following steps 1 and 2.

[0176] In step 1, the UE determines a HARQ-ACK subcodebook for each TRP. In step 2, the UE concatenates the HARQ-ACK subcodebooks of each TRP to determine one HARQ-ACK codebook.

[0177] <Step 1>

[0178] The UE determines the HARQ-ACK codebook (or also called HARQ-ACK subcodebook) corresponding to each TRP. For example, the UE may also determine the HARQ-ACK subcodebook corresponding to each TRP using the operation defined in Rel.15 of 5G (or NR). That is, the UE may also determine the HARQ-ACK subcodebook for each TRP. In addition, the HARQ-ACK subcodebook may also be determined for each CC.

[0179] For example, the UE determines the M for PDSCH reception candidates for each TRP based on a specific rule. A,c A set of M opportunities A,c The set of occasions for candidate PDSCH receptions may also correspond to the HARQ-ACK sent in a specific time slot n.

[0180] <<Step 1-1>>

[0181] The set of timings for PDSCH reception candidates may be determined based on at least one of the following conditions (1) to (4).

[0182] (1) HARQ-ACK timing value (K1)

[0183] (2) PDSCH resource allocation table

[0184] (3) The ratio of the subcarrier spacing of DL transmissions (e.g., PDSCH) to the subcarrier spacing of UL transmissions (e.g., PUCCH)

[0185] (4) UL / DL structure set by the network (e.g., base station)

[0186] Specifically, the same operation as step 1 of the first method may be applied to determine the candidate timing for PDSCH reception for each TRP (or each TRP and CC).

[0187] Fig.11In the figure, an example of the candidate timing for PDSCH reception determined for each TRP is shown. Here, it is assumed that CC0 and CC1 are set in TRP#1 and TRP#2, respectively, and HARQ-ACK (HARQ-ACK corresponding to K1=4, 3, 2, 1, respectively) for multiple PDSCHs are sent in time slot n (UL) of each cell. In addition, the value of K1 can also be set by at least one of high-layer signaling (such as dl-DataToUL-ACK) and DCI.

[0188] Here, it indicates that in each TRP, the PDSCH reception candidate timing indexes corresponding to K1=4~1 of CC0 are 0~3, and the PDSCH reception candidate timing indexes corresponding to K1=4~1 of CC1 are 4~7. The PDSCH reception candidate timing indexes are numbered based on the CC index, but are not limited to this. The PDCCH reception candidate timing can also be set for each TRP.

[0189] <<Step 1-2>>

[0190] The UE determines the total number of HARQ-ACK bits and the HARQ-ACK bit order for each TRP. For example, the UE may also determine the total number of HARQ-ACK bits based on the maximum number of CWs set for each TRP, the presence or absence of space or time bundling, the presence or absence of retransmission of CBG units, etc. In addition, the UE may also determine the HARQ-ACK bit order based on the CC index, PDSCH reception candidate timing index, etc.

[0191] Fig.11 In the case where the maximum number of CWs in TRP is 1, retransmission of CBG units is not applied, and bundling is not applied, the total number of HARQ-ACK bits in each TRP is 8.

[0192] <Step 2>

[0193] The UE concatenates the HARQ-ACK subcodebooks corresponding to each TRP to generate one HARQ-ACK codebook.

[0194] The UE may also link the HARQ-ACK subcodebook based on the TRP index. For example, the UE may also link the HARQ-ACK subcodebook so that it is configured in order from small to large or from low to high in TRP index (ascending order). Alternatively, the UE may also link the HARQ-ACK subcodebook so that it is configured in order from large to small in TRP index (descending order).

[0195] In the case of a multi-TRP scenario using multiple cells (or CCs), the HARQ-ACK bit order can also be determined based on the CC index (or serving cell index) between the above-mentioned steps 1 and 2 (after performing step 1 and before performing step 2).

[0196] Hereinafter, description will be given by taking cases 1 to 3 as examples. In addition, the present aspect can also be applied to cases other than the following cases.

[0197] [Scenario 1]

[0198] In case 1, the following conditions are set.

[0199] Resend in CBG units: Not applied (or not set)

[0200] Maximum number of CWs per TRP: 1

[0201] Spatial bundling between TRPs: Not applied (or not set)

[0202] Fig.12 An example of a case where HARQ-ACK for PDSCHs transmitted from two TRPs (M=2) is fed back jointly is shown. Here, a case where HARQ-ACK subcodebooks are determined for each of TRP#0 and TRP#1, and a plurality of subcodebooks are concatenated.

[0203] The HARQ-ACK subcodebook of TRP#0 is composed of PDSCH reception candidate timing indices 0 to 3 corresponding to K1=4 to 1 set in CC0, and PDSCH reception candidate timing indices 4 to 7 corresponding to K1=4 to 1 set in CC1. In addition, the maximum number of CWs for each TRP is 1, and retransmission of CBG units is not applied, so the HARQ-ACK bit of each PDSCH reception candidate timing is 1 bit (8 bits in total).

[0204] Similarly, the HARQ-ACK subcodebook of TRP#1 is composed of PDSCH reception candidate timing indices 0 to 3 corresponding to K1=4 to 1 set in CC0, and PDSCH reception candidate timing indices 4 to 7 corresponding to K1=4 to 1 set in CC1. In addition, the maximum number of CWs for each TRP is 1, and retransmission of CBG units is not applied, so the HARQ-ACK bit of each PDSCH reception candidate timing is 1 bit (8 bits in total).

[0205] Next, the UE concatenates the HARQ-ACK subcodebooks of each TRP to form one HARQ-ACK codebook. For example, the UE may determine the concatenation method of the HARQ-ACK codebook based on the TRP index. Fig.12In the example, it is shown that the HARQ-ACK subcodebooks are connected in the order of TRP index from small to large. The connection method of the HARQ-ACK subcodebooks is not limited to this, and the HARQ-ACK subcodebooks can also be connected in the order of TRP index from large to small.

[0206] In addition, here, the order of HARQ-ACK bits in the HARQ-ACK codebook is determined based on the priority of the TRP index, CC index, and PDSCH reception candidate timing index in the HARQ-ACK codebook. In addition, the priority order used to determine the order of the HARQ-ACK bits can also be appropriately changed for application.

[0207] [Scenario 2]

[0208] In case 2, the following conditions are set.

[0209] Resend in CBG units: Not applied (or not set)

[0210] Maximum number of CWs per TRP: 1

[0211] Spatial bundling between TRPs: Not applied (or not set)

[0212] Fig.13 An example of a case where HARQ-ACK for PDSCHs transmitted from two TRPs (M=2) is fed back jointly is shown. Here, a case where HARQ-ACK subcodebooks are determined for each of TRP#0 and TRP#1, and a plurality of subcodebooks are concatenated.

[0213] The HARQ-ACK subcodebook of TRP#0 is composed of PDSCH reception candidate timing indices 0 to 3 corresponding to K1=4 to 1 set in CC0, and PDSCH reception candidate timing indices 4 to 7 corresponding to K1=4 to 1 set in CC1. In addition, the maximum number of CWs for each TRP is 1, and retransmission of CBG units is not applied, so the HARQ-ACK bit of each PDSCH reception candidate timing is 1 bit (8 bits in total).

[0214] Similarly, the HARQ-ACK subcodebook of TRP#1 is composed of PDSCH reception candidate timing indices 0 and 1 corresponding to K1=3 and 1 set in CC0, and PDSCH reception candidate timing indices 2 and 3 corresponding to K1=3 and 1 set in CC1. In addition, the maximum number of CWs for each TRP is 1, and the retransmission of the CBG unit is not applied, so the HARQ-ACK bit of each PDSCH reception candidate timing is 1 bit (4 bits in total). In this way, different K1s can also be set for each TRP.

[0215] Next, the UE concatenates the HARQ-ACK subcodebooks of each TRP to form one HARQ-ACK codebook. For example, the UE may determine the concatenation method of the HARQ-ACK codebook based on the TRP index. Fig.13 In the example, it is shown that the HARQ-ACK subcodebooks are connected in the order of TRP index from small to large. The connection method of the HARQ-ACK subcodebooks is not limited to this, and the HARQ-ACK subcodebooks can also be connected in the order of TRP index from large to small.

[0216] In addition, here, the order of HARQ-ACK bits in the HARQ-ACK codebook is determined based on the priority of the TRP index, CC index, and PDSCH reception candidate timing index in the HARQ-ACK codebook. In addition, the priority order used to determine the order of the HARQ-ACK bits can also be appropriately changed for application.

[0217] The HARQ-ACK subcodebooks of each TRP are connected to generate a HARQ-ACK codebook, thereby simplifying the generation of the HARQ-ACK codebook even when specific conditions (such as K1, etc.) are set separately (for example, differently) for each TRP.

[0218] [Scenario 3]

[0219] In case 3, the following conditions are set.

[0220] Resend in CBG units: Application (or setting)

[0221] Maximum number of CWs per TRP: 1

[0222] Spatial bundling between TRPs: Not applied (or not set)

[0223] Fig.14 An example of a case where HARQ-ACK for PDSCHs transmitted from two TRPs (M=2) is fed back jointly is shown. Here, a case where HARQ-ACK subcodebooks are determined for TRP#0 and TRP#1, respectively, and multiple subcodebooks are concatenated. In addition, an application (here, the maximum number of CBGs (N CBG / TB,max HARQ-ACK ) is 2) the case of retransmission in CBG units.

[0224] The HARQ-ACK subcodebook of TRP#0 is composed of PDSCH reception candidate timing indices 0 to 7 corresponding to K1=4 to 1 set in CC0, and PDSCH reception candidate timing indices 8 to 15 corresponding to K1=4 to 1 set in CC1. Here, two CBG indexes (CBG0, CBG1) are set for each K1 value. In addition, the maximum number of CWs for each TRP is 1, and retransmission of CBG units is not applied, so the HARQ-ACK bit for each PDSCH reception candidate timing is 1 bit (a total of 16 bits).

[0225] Similarly, the HARQ-ACK subcodebook of TRP#1 is composed of PDSCH reception candidate timing indices 0 to 7 corresponding to K1=4 to 1 set in CC0, and PDSCH reception candidate timing indices 8 to 15 corresponding to K1=4 to 1 set in CC1. Here, two CBG indexes (CBG0, CBG1) are set for each K1 value. In addition, the maximum number of CWs for each TRP is 1, and retransmission of CBG units is not applied, so the HARQ-ACK bit for each PDSCH reception candidate timing is 1 bit (a total of 16 bits).

[0226] Next, the UE concatenates the HARQ-ACK subcodebooks of each TRP to form one HARQ-ACK codebook. For example, the UE may determine the concatenation method of the HARQ-ACK codebook based on the TRP index. Fig.14 In the example, it is shown that the HARQ-ACK subcodebooks are connected in the order of TRP index from small to large. The connection method of the HARQ-ACK subcodebooks is not limited to this, and the HARQ-ACK subcodebooks can also be connected in the order of TRP index from large to small.

[0227] In addition, here, the order of the HARQ-ACK bits in the HARQ-ACK codebook is determined based on the priority of the TRP index, CC index, PDSCH reception candidate timing index, and CBG index in the HARQ-ACK codebook. In addition, the priority order for determining the order of the HARQ-ACK bits can also be appropriately changed for application.

[0228] (Variation 1)

[0229] The network (such as a base station) may also set specific conditions for sending control or receiving control (such as whether K1 or CBG unit retransmission is applied, whether bundling is applied, a specific table, etc.) for multiple TRPs in common, or may set them separately.

[0230] <HARQ-ACK timing value (K1)>

[0231] The base station may set the HARQ-ACK timing value (K1) in common for multiple TRPs, or may set the HARQ-ACK timing value (K1) separately. Figure 7-Figure 12 , Fig.14 In FIG. 1 , K1 is set commonly to TRP0 and TRP1 (same K1). On the other hand, Fig.13 , it shows the case where K1 is set for TRP0 and TRP1 respectively.

[0232] When K1 is commonly set for multiple TRPs (the same K1), the base station may also set a set of K1s (for example, K1) for multiple TRPs to the UE through high-layer signaling. Figure 7-12 , 14, {1, 2, 3, 4}). The UE only needs to apply the K1 set of 1 set set through high-level signaling to multiple TRPs.

[0233] Alternatively, the base station may also set a plurality of K1 sets to the UE through high-layer signaling (eg Fig.13 In this case, each set of K1 may be associated with a specific TRP. The UE only needs to control the HARQ-ACK feedback based on the set of K1 set for each TRP.

[0234] In addition, when multiple TRPs are set for the UE, even if only one set of K1 corresponding to a specific TRP (for example, TRP#0) is set, the UE can also apply the K1 corresponding to the specific TRP to other TRPs (for example, TRP#1).

[0235] <PDSCH time domain resource allocation table>

[0236] The base station may also set the PDSCH time domain allocation table (PDSCH time domain resource allocation table) in common for multiple TRPs, or may set the PDSCH time domain allocation table separately.

[0237] When the PDSCH time domain allocation table is set in common for multiple TRPs, the base station may also set a specific PDSCH time domain allocation table for multiple TRPs through high-layer signaling. The UE only needs to apply the specific table set through high-layer signaling to multiple TRPs.

[0238] Alternatively, the base station may also set multiple PDSCH time domain allocation tables to the UE through high-level signaling. In this case, the allocation tables of each PDSCH time domain may also be set in association with a specific TRP. The UE controls the HARQ-ACK feedback based on the PDSCH time domain allocation tables set for each TRP. In this case, the PDSCH reception candidate timing can be set for each TRP.

[0239] In addition, when multiple TRPs are set for the UE, even if only the PDSCH time domain allocation table corresponding to a specific TRP (for example, TRP#0) is set, the UE can also apply the table corresponding to the specific TRP to other TRPs (for example, TRP#1).

[0240] <Spatial binding between TRP>

[0241] The base station can also use high-layer signaling to configure the UE whether to apply spatial bundling across TRPs.

[0242] (Variation 2)

[0243] The UE may also switch the application of the first HARQ-ACK feedback control shown in the first mode and the second HARQ-ACK feedback control shown in the second mode. For example, the UE may also select one of the first HARQ-ACK feedback control and the second HARQ-ACK feedback control for application based on the setting from the base station or a specific condition.

[0244] For example, the UE may also apply the first HARQ-ACK feedback control when setting the PDSCH reception candidate timing to be the same for different TRPs. As an example, the UE may also apply the first HARQ-ACK feedback control when setting at least one (e.g., all) of the following parameters to be the same for multiple TRPs.

[0245] HARQ-ACK timing value (K1)

[0246] PDSCH time domain resource allocation table

[0247] UL / DL structure set by the network (e.g. base station)

[0248] On the other hand, the UE may also apply the second HARQ-ACK feedback control when setting the PDSCH reception candidate timings for different TRPs to be the same or different. For example, the second HARQ-ACK feedback control may also be set when the first HARQ-ACK feedback control is not set.

[0249] (Other methods)

[0250] In a multi-TRP scenario, the UE needs to determine the TRP corresponding to the received DCI. In the case where one DCI is sent from multiple TRPs (single DCI), the UE can also determine the TRP corresponding to the DCI based on a specific field contained in the DCI. In this case, the bit value (or code point) in the specific field can also be pre-associated with the TRP index. The specific field can also be, for example, at least one of a resource allocation field and a TCI notification field.

[0251] When multiple DCIs are sent from multiple TRPs (multi-DCI), the UE may determine the TRP corresponding to each DCI based on a specific field contained in the DCI or higher-layer signaling.

[0252] Alternatively, the UE may determine the TRP corresponding to each DCI based on specific conditions rather than explicit notification. Fig.15A as well as Fig. 15B ), and when TRP is determined based on the sequence ID ( Fig.16A as well as Fig. 16B ) is used for explanation. In the following description, DCI format 2_1 is used as an example for explanation as DCI, but other DCI formats (such as other DCI format 2 series) may also be applied.

[0253] <Example of TRP determination based on CORESET>

[0254] The UE may determine the TRP to which the DCI format 2_1 is applied based on monitoring the CORESET associated with a specific search space set (eg, a type 3 PDCCH CSS set) of the DCI format 2_1 from each TRP.

[0255] The PDCCH configuration information of each serving cell or each BWP (PDCCH configuration information, such as “PDCCH-Config” of RRC IE) may include a list of configuration information of one or more CORESETs (CORESET configuration information, such as “PDCCH-Config” of RRCIE) (such as “controlResourceSetToAddModList” of RRC IE).

[0256] Furthermore, the configuration information of the PDCCH may include a list of configuration information of one or more search space sets (search space configuration information, for example, “SearchSpace” of RRC IE) (for example, “searchSpacesToAddModList” of RRC IE).

[0257] Each TRP may correspond to (be associated with) a CORESET configured by one CORESET configuration information in the PDCCH configuration information. That is, in the UE, a CORESET may be configured for each TRP.

[0258] The UE may also be conceived to apply DCI format 2_1 detected in multiple search space sets (eg, type 3 PDCCH CSS sets) associated with different CORESETs to different TRPs.

[0259] Non-overlapping time domain resources and frequency domain resources may also be allocated to multiple CORESETs associated with different TRPs. Alternatively, at least a portion of the time domain resources and frequency domain resources allocated to the multiple CORESETs may also overlap.

[0260] Fig.15A as well as Fig. 15B This is a diagram showing an example of TRP determination based on CORESET. Fig.15A as well as Fig. 15B In the example, DCI format 2_1 is transmitted from both TRP1 and TRP2. Fig.15A as well as Fig. 15B The search space set of the search space ID x (x=1, 2) shown may also be expressed as search space set x (x=1, 2). In addition, the search space set x may also be, for example, a type 3 PDCCH CSS set.

[0261] Fig.15A In the example, CORESET1 and CORESET2 do not overlap in at least one of the time domain and the frequency domain. That is, Fig.15A In the embodiment, CORESET1 and CORESET2 can also be allocated to exclusively frequency domain resources (such as one or more PRBs) or time domain resources (such as one or more codewords).

[0262] Fig.15A In the example, CORESET1 and CORESET2 are respectively associated with different TRP1 and TRP2. When the UE detects DCI format 2_1 in search space set 1 associated with CORESET1, the UE may also apply the DCI format 2_1 to TRP1 associated with CORESET1.

[0263] In addition, when the UE detects DCI format 2_1 in the search space set 2 associated with CORESET2, the UE may also apply the DCI format 2_1 to TRP1 associated with CORESET2.

[0264] on the other hand, Fig. 15B In the example, CORESET1 and CORESET2 overlap in at least a portion of the time domain and in at least one of the frequency domain. That is, Fig. 15B In the embodiment, CORESET1 and CORESET2 may also be allocated to partially or completely overlapping frequency domain resources (eg, more than one PRB) and time domain resources (eg, more than one symbol).

[0265] like Fig. 15B As shown, when the frequency domain resources and time domain resources allocated to CORESET1 and CORESET2 at least partially overlap, even if CORESET1 and CORESET2 have different QCLs, the UE may not be able to determine to which TRP the detected DCI format 2_1 belongs.

[0266] Therefore, the UE may determine the TRP to which the DCI format 2_1 is applied, which is detected in the search space set associated with a specific CORSET, based on any of the following (1) to (4).

[0267] (1) The value of the RNTI (e.g., INT-RNTI) used in the CRC scrambling of the DCI format 2_1

[0268] (2) The value of a specific field (e.g., TRP ID) added to each preemption instruction in the detected DCI format 2_1

[0269] (3) Configuration information related to preemption instructions (e.g., “INT-ConfigurationPerServingCell” in RRC IE)

[0270] (4) Sequence used in the scrambling initialization of the PDCCH DMRS (e.g., "pdcch-DMRS-ScramblingID" in the RRC IE)

[0271] For example, based on (1), the TRP may also be associated with the RNTI (e.g., INT-RNTI) (or the value of the RNTI) used in the CRC scrambling of DCI format 2_1. In this case, the RNTI (the value) may also be given to the UE according to each TRP through a high-layer parameter. The UE may also apply the DCI format 2_1 to the TRP associated with the RNTI for which the DCI format 2_1 detection is successful by utilizing monitoring (blind decoding) of the RNTI associated with each TRP.

[0272] In addition, based on (2), a specific field indicating TRP (or TRP ID) may be added in DCI format 2_1. The UE may also apply DCI format 2_1 (or each preemption instruction in DCI format 2_1) to the TRP indicated by the value of the specific field in the detected DCI format 2_1.

[0273] In addition, based on (3), information indicating the TRP to which each preemption instruction is applied may be included in the configuration information related to the preemption instruction (for example, "INT-ConfigurationPerServingCell" of the RRC IE).

[0274] Alternatively, based on (3), the location information of the preemption instruction corresponding to each TRP may be included in the configuration information related to the preemption instruction (for example, "INT-ConfigurationPerServingCell" of the RRC IE).

[0275] In addition, based on (4), the TRP may also be associated with the sequence (or the ID of the sequence) used for scrambling initialization of the DMRS of the PDCCH transmitting DCI format 2_1. In this case, the sequence may also be given to the UE according to each TRP through high-layer parameters.

[0276] <Example of TRP determination based on sequence ID>

[0277] Fig.16A as well as Fig. 16B This is a diagram showing an example of TRP determination based on a sequence ID according to the second method. Fig.16A as well as Fig. 16B In the example, multiple sequences (or sequence IDs) are set for each CORESET. Fig.16A as well as Fig. 16B In the example, for each of CORESET1 and CORESET2, a sequence ID#n and ID#m are given to the UE, but the present invention is not limited thereto. For example, Fig.16A as well as Fig. 16B In the example, sequence ID#n is associated with TRP1, and sequence ID#m is associated with TRP2.

[0278] like Fig.16A as well as Fig. 16BAs shown, the UE may also assume that, when DCI format 2_1 is detected in the PDCCH demodulated using the DMRS sequence generated by sequence ID#n, the DCI format 2_1 indicates preemption for the DL transmission (e.g., PDSCH) from TRP1 associated with sequence ID#n. That is, the UE may also assume that the PDSCH scheduled by the PDCCH using the DMRS sequence generated by sequence ID#n is indicated to preempt.

[0279] On the other hand, the UE may also assume that, when DCI format 2_1 is detected in the PDCCH demodulated using the DMRS sequence generated by sequence ID#m, the DCI format 2_1 indicates preemption for the DL transmission (e.g., PDSCH) from TRP2 associated with sequence ID#m. That is, the UE may also assume that the PDSCH scheduled by the PDCCH using the DMRS sequence generated by sequence ID#m is indicated.

[0280] The above-mentioned determination of TRP based on sequence (or sequence ID) can also be used in the case where multiple CORESETs associated with multiple TRPs overlap ( Fig. 16B ), or it can also be used when the multiple CORESETs do not overlap ( Fig.16A ). Fig.16A In the DCI format 2_1, CORESET is associated with TRP. However, even if CORESET is not associated with TRP, the TRP that becomes the application object of DCI format 2_1 can be determined by associating the above sequence (or sequence ID) with TRP.

[0281] <Example of TRP determination based on other parameters>

[0282] The UE may determine the TRP to which the DCI format 2_1 is to be applied based on monitoring a specific search space set (eg, a type 3 PDCCH CSS set) of the DCI format 2_1 from each TRP.

[0283] Each TRP may also correspond to (be associated with) a search space set configured by a search space configuration information in the above-mentioned PDCCH configuration information. That is, in the UE, a search space set may also be configured for each TRP.

[0284] The UE may also be considered to apply DCI format 2_1 detected in different search space sets (eg, type 3 PDCCH CSS set) to different TRPs. The different search space sets may also be associated with the same CORESET, or may also be associated with different CORESETs.

[0285] Alternatively, the UE may determine the TRP to which the DCI format 2_1 is applied based on PDCCH setting information (e.g., "PDCCH-Config" of RRC IE) that includes setting information of a specific search space set for monitoring DCI format 2_1 from each TRP and setting information of a CORESET associated with the specific search space set.

[0286] Each TRP may also correspond to (be associated with) the above-mentioned PDCCH setting information. That is, in the UE, the PDCCH setting information may also be set according to each TRP.

[0287] Alternatively, the UE may determine the TRP to which the DCI format 2_1 is applied based on the CDM group of the DMRS port of the PDSCH (or PDCCH) of each TRP. Each TRP may correspond to (be associated with) the above CDM group.

[0288] (Wireless Communication System)

[0289] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0290] Fig.17 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0291] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0292] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0293] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0294] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0295] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0296] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0297] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0298] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station may also be referred to as an IAB node.

[0299] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0300] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0301] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0302] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0303] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0304] In addition, in the wireless communication system 1, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used.

[0305] The PDSCH is used to transmit user data, high-layer control information, system information block (SIB), etc. The PUSCH is also used to transmit user data, high-layer control information, etc. In addition, the PBCH is also used to transmit the master information block (MIB).

[0306] Lower layer (lower layer) control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0307] In addition, the DCI for scheduling PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, PDSCH may also be replaced by DL data, and PUSCH may also be replaced by UL data.

[0308] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0309] A search space may also correspond to PDCCH candidates that are consistent with one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0310] The PUCCH may also be used to transmit at least one uplink control information (uplink control information (UCI)) including channel state information (CSI), delivery confirmation information (e.g., may also be called hybrid automatic repeat request (HARQ-ACK)), ACK / NACK, etc.), and scheduling request (SR). The random access preamble used to establish a connection with a cell may also be transmitted through the PRACH.

[0311] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0312] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0313] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0314] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0315] (Base Station)

[0316] Fig.18 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0317] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the base station 10 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0318] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0319] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0320] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0321] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured by a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0322] The transmitting / receiving antenna 130 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, for example, an array antenna.

[0323] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0324] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0325] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0326] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT)) processing (as needed), inverse fast Fourier transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0327] The transmitting and receiving unit 120 (RF unit 122 ) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0328] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0329] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0330] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (ReceivedSignal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0331] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0332] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0333] In addition, the transmitting and receiving unit 120 may also transmit information related to the type of HARQ-ACK codebook commonly applied to multiple TRPs. The transmitting and receiving unit 120 may also receive a HARQ-ACK codebook containing HARQ-ACK bits corresponding to each DL transmission (e.g., PDSCH) transmitted from multiple TRPs.

[0334] The control unit 110 may also perform control so that the same type of HARQ-ACK codebook is applied in the UE to the HARQ-ACK corresponding to each DL transmission (eg, PDSCH) sent from multiple TRPs.

[0335] (User Terminal)

[0336] Fig.192 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0337] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and the user terminal 20 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0338] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0339] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0340] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0341] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured by a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0342] The transmitting / receiving antenna 230 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0343] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0344] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0345] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0346] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0347] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0348] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0349] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0350] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0351] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0352] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 , the transmitting and receiving antenna 230 , and the transmission path interface 240 .

[0353] In addition, the transmitting and receiving unit 220 receives downlink shared channels respectively transmitted from a plurality of transmission and receiving points. In addition, the transmitting and receiving unit 220 may also apply the same type of delivery confirmation signal codebook to a plurality of retransmission control information for each downlink shared channel, so that the plurality of retransmission control information are included in the same delivery confirmation signal codebook and transmitted. In addition, the transmitting and receiving unit 220 may also receive information related to the type of HARQ-ACK codebook commonly applied to a plurality of TRPs.

[0354] The control unit 210 may control to apply the same type of codebook for the transmission confirmation signal to a plurality of retransmission control information for each downlink shared channel, so that the plurality of retransmission control information are included in the same codebook for the transmission confirmation signal and transmitted.

[0355] For example, the control unit 210 may also determine at least one of the number of bits of retransmission control information corresponding to the candidate reception timing of each downlink shared channel and the order of the retransmission control information after determining the candidate reception timing of the downlink shared channel. In addition, the control unit 210 may also determine the number of bits of retransmission control information corresponding to the candidate reception timing of each downlink shared channel based on at least one of the maximum number of codewords for each transmission and reception point, the presence or absence of spatial bundling between multiple transmission and reception points, and the presence or absence of retransmission settings for the application code block group.

[0356] Alternatively, the control unit 210 may determine the codebook for the delivery confirmation signal after determining the subcodebook for each transmission and reception point. For example, the control unit 210 may also determine the codebook for the delivery confirmation signal by concatenating the subcodebook for each transmission and reception point based on the index of each transmission and reception point.

[0357] (Hardware Structure)

[0358] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0359] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0360] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 20 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0361] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0362] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0363] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0364] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0365] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that enables a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0366] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0367] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0368] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) can also be installed by the transmitting unit 120a (220a) and the receiving unit 120b (220b) separately physically or logically.

[0369] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0370] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0371] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be installed using at least one of these hardware.

[0372] (Variation Example)

[0373] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc., depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0374] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0375] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0376] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0377] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0378] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0379] For example, a subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and a time slot or a mini time slot may also be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may also be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0380] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0381] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may also be shorter than the TTI.

[0382] In addition, when one time slot or one mini time slot is referred to as TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0383] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0384] In addition, long TTI (e.g., normal TTI, subframe, etc.) can also be replaced by TTI with a time length exceeding 1ms, and short TTI (e.g., shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than that of long TTI and greater than 1ms.

[0385] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, 12 subcarriers. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0386] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0387] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0388] In addition, a resource block may also be composed of one or more resource elements (RE). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

[0389] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0390] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0391] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0392] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0393] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0394] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. In addition, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0395] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0396] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0397] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0398] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0399] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0400] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0401] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0402] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, a set of instructions, code, code segment, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable file, execution thread, procedure, function, etc.

[0403] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0404] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0405] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0406] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0407] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0408] In the present disclosure, terms such as “Mobile Station (MS)”, “user terminal”, “User Equipment (UE)”, and “terminal” can be used interchangeably.

[0409] In some cases, the mobile station is also referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or some other appropriate terminology.

[0410] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0411] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" may also be replaced by expressions corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0412] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0413] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node according to the circumstances. Obviously, in a network including one or more network nodes having a base station, various actions performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0414] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0415] The various modes and implementation modes described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0416] The term “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the term “based on” means both “based only on” and “based at least on”.

[0417] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to a first and a second element does not mean that only two elements can be used, or that the first element must take precedence over the second element in some form.

[0418] The term "determining" as used in this disclosure may include a variety of actions in some cases. For example, "determining" may also be viewed as "judging", calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0419] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0420] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on some actions.

[0421] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0422] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, or may refer to the nominal maximum transmit power (the nominal UE maximum transmit power), or may refer to the rated maximum transmit power (the rated UE maximum transmit power).

[0423] The terms "connected", "coupled", or all their variations used in this disclosure mean all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination of these. For example, "connection" may also be replaced by "access".

[0424] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0425] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted as "different".

[0426] In the present disclosure, when the terms "include", "including", and their variations are used, these terms, like the term "comprising", have an inclusive meaning. Furthermore, the term "or" used in the present disclosure does not mean an exclusive OR.

[0427] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0428] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the present invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal comprising: A receiving unit, which receives a physical downlink control channel (PDCCH) corresponding to each of the first control resource set (the first CORESET) and the second CORESET, and receives a plurality of physical downlink shared channels (PDSCH) scheduled by the PDCCH in a completely or partially overlapping time domain; a control unit, which, when a semi-static delivery confirmation information codebook, i.e., a HARQ-ACK codebook, is set, determines a first HARQ-ACK codebook corresponding to the first CORESET and a second HARQ-ACK codebook corresponding to the second CORESET, determines an order of HARQ-ACK bits of each HARQ-ACK codebook based on a first order of PDSCH reception candidate timing indexes and a second order of serving cell indexes, and links the first HARQ-ACK codebook and the second HARQ-ACK codebook; as well as A sending unit is configured to send a HARQ-ACK corresponding to the concatenated first HARQ-ACK codebook and the second HARQ-ACK codebook.

2. A wireless communication method of a terminal, comprising: The step of receiving a physical downlink control channel (PDCCH) corresponding to each of the first control resource set (i.e., the first CORESET) and the second CORESET, and receiving a plurality of physical downlink shared channels (PDSCH) scheduled by the PDCCH in a completely or partially overlapping time domain; In a case where a semi-static delivery confirmation information codebook, i.e., a HARQ-ACK codebook, is set, a first HARQ-ACK codebook corresponding to the first CORESET and a second HARQ-ACK codebook corresponding to the second CORESET are determined, and an order of HARQ-ACK bits of each HARQ-ACK codebook is determined based on a first order of PDSCH reception candidate timing indexes and a second order of serving cell indexes, and the first HARQ-ACK codebook and the second HARQ-ACK codebook are linked; and and transmitting a HARQ-ACK corresponding to the concatenated first HARQ-ACK codebook and the second HARQ-ACK codebook.

3. A base station, comprising: a transmitting unit, which transmits a physical downlink control channel (PDCCH) corresponding to the first control resource set (i.e., the first CORESET) and the second CORESET, and transmits a plurality of physical downlink shared channels (PDSCH) scheduled by the PDCCH in a completely or partially overlapping time domain, in, In a case where a semi-static delivery confirmation information codebook, i.e., a HARQ-ACK codebook, is set, a first HARQ-ACK codebook corresponding to the first CORESET and a second HARQ-ACK codebook corresponding to the second CORESET are determined, and an order of HARQ-ACK bits of each HARQ-ACK codebook is determined based on a first order of PDSCH reception candidate timing indexes and a second order of serving cell indexes, and the first HARQ-ACK codebook and the second HARQ-ACK codebook are linked, The base station further includes a receiving unit configured to receive HARQ-ACK corresponding to the concatenated first HARQ-ACK codebook and the second HARQ-ACK codebook.

4. A system having a terminal and a base station, The terminal has: A receiving unit, which receives a physical downlink control channel (PDCCH) corresponding to each of the first control resource set (the first CORESET) and the second CORESET, and receives a plurality of physical downlink shared channels (PDSCH) scheduled by the PDCCH in a completely or partially overlapping time domain; a control unit, which, when a semi-static delivery confirmation information codebook, i.e., a HARQ-ACK codebook, is set, determines a first HARQ-ACK codebook corresponding to the first CORESET and a second HARQ-ACK codebook corresponding to the second CORESET, determines an order of HARQ-ACK bits of each HARQ-ACK codebook based on a first order of PDSCH reception candidate timing indexes and a second order of serving cell indexes, and links the first HARQ-ACK codebook and the second HARQ-ACK codebook; and a sending unit, configured to send a HARQ-ACK corresponding to the concatenated first HARQ-ACK codebook and the second HARQ-ACK codebook; The base station has: A receiving unit receives the HARQ-ACK.

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