Terminal and wireless communication method

Abstract

A terminal according to an aspect of the present disclosure is characterized by including: a control unit that determines a last DCI format associated with a specific group index from among detected downlink control information (DCI) formats corresponding to transmissions of uplink control channels in the same time slot; and a transmission unit that transmits the uplink control channel using resources corresponding to the last DCI format. According to an aspect of the present disclosure, HARQ-ACK control can be appropriately performed even in the case of using multiple TRPs.

Description

Technical Field

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. Technical Field

[0003] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). In addition, for the purpose of further increasing the capacity and sophistication of LTE (3rd Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel.10-14) has been standardized.

[0004] Research is also being conducted on a successor system to LTE (for example, also known as the 5th generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel.15 and later, etc.).

[0005] Prior Art Documents

[0006] Non-Patent Documents

[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 a future wireless communication system (for example, NR), research is being conducted on one or more Transmission / Reception Points (TRPs) (multi-TRP) to perform DL transmission to a user terminal (User Equipment (UE)).

[0010] As a method of Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK) feedback in the case of using multiple transmission and reception points (TRPs), separate HARQ-ACK feedback and joint HARQ-ACK feedback are being studied.

[0011] In separate HARQ-ACK feedback, the user equipment (UE) transmits HARQ-ACK using different uplink control channels (Physical Uplink Control Channel (PUCCH)) for each TRP. On the other hand, in joint HARQ-ACK feedback, the UE uses one PUCCH to transmit HARQ-ACK for multiple TRPs.

[0012] On the other hand, in the case of using multiple TRPs as described above, in the case of applying joint HARQ-ACK feedback, there has been no study on how to determine PUCCH resources. If the control of HARQ-ACK is not properly performed, there is a concern that the spatial diversity gain, high-rank transmission, etc. in the case of using multiple TRPs cannot be properly achieved, and the increase in communication throughput is suppressed.

[0013] Therefore, one object of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately performing HARQ-ACK control even in the case of using multiple TRPs.

[0014] Means for Solving the Problem

[0015] A terminal according to an aspect of the present disclosure is characterized by including: a control unit that determines a last Downlink Control Information (DCI) format associated with a specific group index from detected DCI formats corresponding to transmissions of uplink control channels in the same time slot; and a transmission unit that transmits the uplink control channel using a resource corresponding to the last DCI format.

[0016] Technical Effects

[0017] According to an aspect of the present disclosure, HARQ-ACK control can be appropriately performed even in the case of using multiple TRPs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A-1D It is a diagram showing an example of a multiple TRP scenario.

[0019] Figure 2This is a diagram showing an example of an unexpected situation in Rel-15 NR.

[0020] Figure 3 This is a diagram showing an example of the "last DCI format" in the second embodiment.

[0021] Figure 4 This is a diagram showing another example of the "last DCI format" in the second embodiment.

[0022] Figure 5 This is a diagram showing an example of the "last DCI format" in Embodiment 3-1.

[0023] Figure 6 This is a diagram showing an example of the "last DCI format" in Embodiment 3-2.

[0024] Figure 7 This is a diagram showing an example of the "last DCI format" in Embodiment 3-3.

[0025] Figure 8 This is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment.

[0026] Figure 9 This is a diagram showing an example of the structure of a base station according to an embodiment.

[0027] Figure 10 This is a diagram showing an example of the structure of a user terminal according to an embodiment.

[0028] Figure 11 This is a diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment.

[0029] (Multi-TRP)

[0030] In NR, one or more Transmission / Reception Points (TRPs) (multi-TRP) are being studied to perform DL transmission to a UE using one or more panels (multi-panel). In addition, UL transmission from the UE to one or more TRPs is being studied.

[0031] In addition, multiple TRPs can correspond to the same Cell Identifier (ID) or different cell IDs. This cell ID can be either a physical cell ID or a virtual cell ID.

[0032] Figure 1A-1D This is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP can transmit 4 different beams, but this is not limited thereto.

[0033] Figure 1A An example of a case where only one TRP (TRP1 in this example) among multiple TRPs transmits to a UE (which can also be referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both a control signal (Physical Downlink Control Channel (PDCCH)) and a data signal (Physical Downlink Shared Channel (PDSCH)) to the UE.

[0034] Figure 1B An example of a case where only one TRP (TRP1 in this example) among multiple TRPs transmits a control signal to a UE, and the multiple TRPs transmit data signals (which can also be referred to as single master mode). The UE receives each PDSCH transmitted from the multiple TRPs based on one Downlink Control Information (DCI).

[0035] Figure 1C An example of a case where each of multiple TRPs transmits a part of a control signal to a UE, and the multiple TRPs transmit data signals (which can also be referred to as master - slave mode). Part 1 of the control signal (DCI) can be transmitted in TRP1, and part 2 of the control signal (DCI) can be transmitted in TRP2. Part 2 of the control signal can also depend on part 1. The UE receives each PDSCH transmitted from the multiple TRPs based on these parts of the DCI.

[0036] Figure 1D An example of a case where each of multiple TRPs transmits a separate control signal to a UE, and the multiple TRPs transmit data signals (which can also be referred to as multi - master mode). A first control signal (DCI) can be transmitted in TRP1, and a second control signal (DCI) can be transmitted in TRP2. The UE receives each PDSCH transmitted from the multiple TRPs based on these DCIs.

[0037] When using one DCI to schedule multiple PDSCHs from Figure 1B multiple TRPs like that (which can also be called multiple PDSCH), this DCI can also be referred to as single DCI (single PDCCH). Additionally, when using multiple DCIs to separately schedule multiple PDSCHs from Figure 1D multiple TRPs like that, these multiple DCIs can also be referred to as multi - DCI (multiple PDCCH).

[0038] According to such a multi-TRP scenario, more flexible transmission control using a channel with good quality can be performed.

[0039] Also, different codewords (Code Word (CW)) and different layers can be transmitted from each TRP of the multi-TRP respectively. As a method of multi-TRP transmission, Non-Coherent Joint Transmission (NCJT) is being studied.

[0040] In NCJT, for example, TRP1 performs modulation mapping on the first codeword and layer mapping, and uses the first precoding to transmit the first PDSCH for the first number of layers (for example, two layers). In addition, TRP2 performs modulation mapping on the second codeword and layer mapping, and uses the second precoding to transmit the second PDSCH for the second number of layers (for example, two layers).

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

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

[0043] (HARQ-ACK for multi-TRP)

[0044] However, as the Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback for the multi-PDSCH, separate HARQ-ACK feedback and joint HARQ-ACK feedback are being studied.

[0045] Separate HARQ-ACK feedback (which may also be referred to as separate HARQ-ACK) corresponds to the UE sending HARQ-ACK feedback for each TRP through different uplink control channels (Physical Uplink Control Channel (PUCCH)) and uplink shared channel (Physical Uplink Shared Channel (PUSCH)) resources. These multiple PUCCH / PUSCH resources may either overlap (and may be sent simultaneously) or not overlap.

[0046] If separate HARQ-ACK is used, independent HARQ-ACK transmission can be performed for each TRP. Even when the backhaul delay between TRPs is large (for example, the TRPs are connected through a non-ideal backhaul), the delay of HARQ will not increase.

[0047] Joint HARQ-ACK feedback (which may also be referred to as joint HARQ-ACK) corresponds to the UE sending HARQ-ACK feedback for each TRP through the same PUCCH / PUSCH resource.

[0048] When joint HARQ-ACK is used, one PUCCH / PUSCH transmission is sufficient, so resource overhead can be reduced. Additionally, when the backhaul delay between TRPs is small (for example, the TRPs are connected through an ideal backhaul), the HARQ-ACK sent to one TRP can be delivered to another TRP with low latency.

[0049] In addition, PUCCH / PUSCH may also mean at least one of PUCCH and PUSCH (hereinafter, "A / B" can similarly be replaced with "at least one of A and B").

[0050] In the present disclosure, HARQ-ACK can be interpreted as both separate HARQ-ACK and joint HARQ-ACK without special specification.

[0051] One or more DCIs scheduling multiple PDSCHs may also include a field for a PUCCH resource indicator (PUCCH resource indicator (PRI)). The PRI corresponds to information specifying the resource used to send the HARQ-ACK corresponding to the PDSCH, and may also be referred to as an ACK / NACK resource indicator (ACK / NACK Resource Indicator (ARI)).

[0052] The UE can also determine the PUCCH resources for transmitting HARQ-ACK corresponding to the above-mentioned multiple PDSCHs based on the PRI.

[0053] (HARQ-ACK codebook)

[0054] In NR, the UE can also use one PUCCH resource to send HARQ-ACK feedback in units of a HARQ-ACK codebook composed of bits of more than one delivery confirmation information (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)). HARQ-ACK bits can also be referred to as HARQ-ACK information, HARQ-ACK information bits, etc.

[0055] Here, the HARQ-ACK codebook can also be configured to include bits for HARQ-ACK in units of at least one of time domain (e.g., time slot), frequency domain (e.g., Component Carrier (CC)), spatial domain (e.g., layer, beam), transport block (Transport Block (TB)), and code block group (Code Block Group (CBG)) constituting the TB. The HARQ-ACK codebook can also be abbreviated as the codebook.

[0056] In addition, the number of bits (size), etc. included in the HARQ-ACK codebook can be determined semi-statically or dynamically. The HARQ-ACK codebook whose size is determined semi-statically is also referred to as a semi-static HARQ-ACK codebook, type 1 HARQ-ACK codebook, etc. The HARQ-ACK codebook whose size is determined dynamically is also referred to as a dynamic HARQ-ACK codebook, type 2 HARQ-ACK codebook, etc.

[0057] Which of the type 1 HARQ-ACK codebook and the type 2 HARQ-ACK codebook to use can also be set for the UE using a higher layer parameter (e.g., pdsch-HARQ-ACK-Codebook).

[0058] In the case of the type 1 HARQ-ACK codebook, the UE can also feedback HARQ-ACK bits for PDSCH candidates (or PDSCH opportunities (occasions)) corresponding to a specific range (e.g., a range set based on a higher layer parameter) regardless of the presence or absence of scheduling of the PDSCH within that specific range.

[0059] This specific range can also be determined based on at least one of a specific period (e.g., a set of a specific number of opportunities (occasions) for PDSCH reception to become a candidate, or a specific number of monitoring opportunities (monitoring occasions) for PDCCH), the number of CCs set or activated for the UE, the number of TBs (number of layers or ranks), the number of CBGs per 1 TB, and whether spatial bundling is applied. This specific range is also referred to as a HARQ-ACK window, a HARQ-ACK bundling window, a HARQ-ACK feedback window, etc.

[0060] In a type 1 HARQ-ACK codebook, if within a specific range, even without scheduling of PDSCH for the UE, the UE ensures bits for the PDSCH within the codebook. When the UE determines that the PDSCH is not actually scheduled, it can also feedback these bits as NACK bits.

[0061] On the other hand, in the case of a type 2 HARQ-ACK codebook, the UE can also feedback HARQ-ACK bits for the scheduled PDSCH within the above specific range.

[0062] Specifically, the UE can also determine the number of bits of the type 2 HARQ-ACK codebook based on a specific field within the DCI (e.g., the DL assignment index (Downlink Assignment Indicator (Index) (DAI)) field). The DAI field can, for example, also include at least one of a counter DAI (Counter DAI (C-DAI)) and a total DAI (Total DAI (T-DAI)).

[0063] C-DAI can also represent the counter value of downlink transmissions (PDSCH, data, TB) scheduled within a specific period. For example, the C-DAI within the DCI scheduling data within this specific period can also represent the number obtained by first counting in the frequency domain (e.g., CC) and then in the time domain within this specific period. For example, C-DAI can be equivalent to the value obtained by counting PDSCH receptions or semi-persistent scheduling (SPS) releases in ascending order of serving cell index and then in ascending order of PDCCH monitoring opportunities for one or more DCIs included in a specific period.

[0064] That is, C-DAI can also mean the cumulative number of pairs of {serving cell, PDCCH monitoring opportunity} corresponding to each data up to the current serving cell and the current PDCCH monitoring opportunity.

[0065] T-DAI can also represent the total value (total number) of data scheduled within a specific period. For example, the T-DAI in the DCI that schedules data in a certain time unit (e.g., PDCCH monitoring opportunity) within the specific period can also represent the total number of data scheduled up to that time unit (also referred to as a point, timing, etc.) within the specific period.

[0066] That is, T-DAI is the total number of pairs of {serving cell, PDCCH monitoring opportunity} corresponding to each data up to the current PDCCH monitoring opportunity, and can also mean a value updated for each PDCCH monitoring opportunity.

[0067] In Rel-15 NR, it is specified that in the case where the UE does not expect to detect more than 2 DCI formats, the more than 2 DCI formats are the DCI formats of multiple PDCCHs whose first symbol in a certain time slot is received with the same symbol (in other words, starts with the same symbol), schedule the PDSCH reception or SPS PDSCH release for the same cell, and indicate the corresponding HARQ-ACK transmission in the same time slot.

[0068] In addition, the more than 2 DCI formats can be either the same format or different formats.

[0069] Figure 2 This is a diagram showing an example of a situation not expected in Rel-15 NR. In this example, DCI#1 transmitted in symbol #0 of time slot n schedules PDSCH#1, and the PUCCH resource for the corresponding HARQ-ACK is scheduled for time slot n + k. In addition, DCI#2 also transmitted in symbol #0 of time slot n schedules PDSCH#2, and the PUCCH resource for the corresponding HARQ-ACK is scheduled for time slot n + k.

[0070] In addition, PDSCH#1 and #2 can start from the same symbol or from different symbols (the same applies to the following drawings).

[0071] The transmission timing of HARQ-ACK for the PDSCH (which can also be referred to as PDSCH-to-HARQ feedback timing, K1, etc.) can also be determined by the PDSCH-to-HARQ feedback timing indication field included in the DCI (e.g., DCI format 1_0 / 1_1) that schedules the PDSCH. If the last time slot in which the PDSCH is received is set to n, it means that the UE transmits the HARQ-ACK corresponding to the PDSCH in time slot n + K1.

[0072] In addition, the specification of the above PDSCH-to-HARQ feedback timing is not limited to being in units of time slots. For example, it can also be in units of sub-time slots.

[0073] The case where a UE compliant with Rel-15 NR does not expect to simultaneously detect Figure 2 DCI #1 and #2.

[0074] In addition, in Rel-15 NR, it is specified that the PUCCH resource for transmitting HARQ-ACK in a certain time slot is determined based on the PRI included in the last DCI format, and this last DCI format is the last DCI format among the DCI formats (such as DCI format 1_0 / 1_1) that have a value in the PDSCH-to-HARQ feedback timing indication field indicating the PUCCH transmission in that time slot.

[0075] In Rel-15 NR, this "last DCI format" means the last (in other words, the equivalent of the largest index) DCI format in the case where the detected DCI formats corresponding to the PUCCH transmission in the same time slot are appended with indexes in ascending order for the same PDCCH monitoring occasion (PDCCH Monitoring Occasion (PMO)) across serving cells, and then appended with indexes in ascending order for the indexes of the PDCCH monitoring occasions.

[0076] If the "last DCI format" is expressed in another way, it is equivalent to the last DCI format obtained by arranging in order the detected DCI formats corresponding to the PUCCH transmission in the same time slot, starting from a CC index that is more forward (smaller) and a PDCCH monitoring period that is more forward (smaller). This indexing of the DCI used to determine the PUCCH resource is equivalent to indexing in which the frequency domain is first and the time domain is second.

[0077] On the other hand, in the case of using multiple TRPs as described above, in the case of applying joint HARQ-ACK feedback, there has been no research on how to determine the PUCCH resource.

[0078] For example, for multiple TRPs, the case where the index for each TRP (which can also be called the index associated with the TRP, the TRP index, etc.) is notified to the UE is being studied, but how to utilize this index has not been fully studied.

[0079] In the case where HARQ-ACK control cannot be appropriately performed, there are concerns that the spatial diversity gain, high-rank transmission, etc. in the case of using multiple TRPs cannot be appropriately achieved, and the increase in communication throughput is suppressed.

[0080] Therefore, the inventors of the present invention have come up with HARQ-ACK control that can handle the case of using multiple TRPs.

[0081] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods of the respective embodiments can be applied separately or in combination.

[0082] In addition, in the present disclosure, a panel, an uplink (UL) transmission entity, a TRP, a spatial relationship, a control resource set (CORESET), a PDSCH, a codeword, a base station, a specific antenna port (e.g., a demodulation reference signal (DMRS) port), a specific antenna port group (e.g., a DMRS port group), a specific group (e.g., a code division multiplexing (CDM) group, a specific reference signal group, a CORESET group), etc. can also be replaced with each other.

[0083] In addition, a panel identifier (ID) and a panel can also be replaced with each other. That is, a TRP ID and a TRP, a CORESET group ID and a CORESET group, etc. can also be replaced with each other. IDs and indexes can also be replaced with each other.

[0084] Furthermore, the "group" in the present disclosure can be replaced with a grouping, a sequence, a list, a set, etc.

[0085] In addition, in the present disclosure, NCJT, NCJT using multiple TRPs, multiple PDSCHs using NCJT, multiple PDSCHs, multiple PDSCHs from multiple TRPs, etc. can also be replaced with each other.

[0086] The following PUCCH can also be replaced with a PUSCH.

[0087] In addition, in the present disclosure, the index of each TRP, the TRP index, the high-layer signaling index of each CORESET, the index of each CORESET, the CORESET index, the CORESET association index, the CORESET group ID, the index related to a TRP and HARQ-ACK (PUCCH), the index related to a CORESET and HARQ-ACK (PUCCH), the codebook association index, the codebook index, etc. can also be replaced with each other.

[0088] In addition, the "two DCI formats" in the present disclosure can also be replaced with "two or more DCI formats".

[0089] In addition, in the present disclosure, "Scenario 1" and "Scenario 2" may also respectively refer to the following scenarios.

[0090] Scenario 1 is a scenario where the UE does not anticipate detecting two DCI formats, which are the two DCI formats of multiple PDCCHs whose first symbols in a certain time slot are received with the same symbol (in other words, start with the same symbol), and the two DCI formats schedule PDSCH reception or SPS PDSCH release for the same cell, and indicate corresponding HARQ-ACK transmission in the same time slot. That is, Scenario 1 corresponds to the scenario related to the simultaneous reception of two DCI formats in Rel-15 NR.

[0091] Scenario 2 is a scenario where the UE allows detecting two DCI formats, which are the two DCI formats of multiple PDCCHs whose first symbols in a certain time slot are received with the same symbol, and the two DCI formats schedule PDSCH reception or SPS PDSCH release for the same cell, the two DCI formats respectively correspond to CORESETs associated with different TRPs (for example, different CORESET groups, different CORESET group IDs), and the two DCI formats indicate corresponding HARQ-ACK transmission in the same time slot.

[0092] (Wireless communication method)

[0093] <First Embodiment>

[0094] In the first embodiment, in the case of using multiple TRPs, even when applying joint HARQ-ACK feedback, the UE uses the same PUCCH resource determination mechanism as Rel-15 NR.

[0095] That is, in the case of using multiple TRPs, even when applying joint HARQ-ACK feedback, the UE can determine the PUCCH resource for transmitting HARQ-ACK in a certain time slot based on the PRI included in the last DCI format, where the last DCI format is the last DCI format among the DCI formats having a value of the PDSCH-to-HARQ feedback timing indication field indicating PUCCH transmission in that time slot.

[0096] Here, the "last DCI format" may also mean the last (in other words, corresponding to the largest index) DCI format in the case where the detected DCI formats corresponding to PUCCH transmission in the same time slot are appended with indexes in ascending order for the same PDCCH monitoring opportunity across serving cells, and then appended with indexes in ascending order for the indexes of PDCCH monitoring opportunities.

[0097] In the first embodiment, the UE may also assume that the CORESET group ID is not used (or not applied) for joint HARQ-ACK feedback. In other words, even when parameters such as the CORESET group ID in the TRP direction are set for the UE, the UE may determine the PUCCH resources for joint HARQ-ACK feedback without using such parameters.

[0098] The first embodiment may also be applicable only to Scenario 1.

[0099] According to the first embodiment described above, the UE can appropriately determine the "last DCI format" related to the PUCCH resource determination.

[0100] In addition, in the present disclosure, the PUCCH resources may be determined based on the last DCI format (for example, any field of the last DCI format, Radio Network Temporary Identifier (RNTI), resource, corresponding DMRS, etc.), and are not limited to the determination based on the PRI included in the last DCI format. For the determination of the PUCCH resources hereafter, the "PRI included in the last DCI format" may also be replaced by the "last DCI format".

[0101] <Second Embodiment>

[0102] In the second embodiment, the PUCCH resources may also be determined based on the last DCI format associated with a specific CORESET group ID. For example, for the detected DCI, the UE may determine the corresponding last DCI format for each CORESET group ID, and then determine one DCI format for PUCCH resource determination from the multiple determined last DCI formats according to a specific rule.

[0103] In addition, the UE may be notified of the correspondence between the PUCCH (or CORESET or DCI format) and the CORESET group ID through higher layer signaling, physical layer signaling (such as DCI), or a combination thereof. For example, the UE may be set with an index related to the PUCCH (for example, PUCCH resource ID) or the CORESET group ID associated with the CORESET ID. The UE may also determine the CORESET group corresponding to the received DCI (PDCCH) based on the above correspondence.

[0104] In addition, the correspondence between the TRP and the CORESET group may be set for the UE through higher layer signaling or may be pre-determined by the specification.

[0105] In addition, in the present disclosure, the higher-layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0106] For example, the MAC signaling may also use a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may also be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0107] The UE may also be configured with different scrambling IDs in the first CORESET group and the second CORESET group. At this time, even if the time-frequency resources of the CORESET belonging to the first CORESET group and the CORESET belonging to the second CORESET group overlap, the UE can appropriately determine the CORESET group (and thus the corresponding TRP) corresponding to the CORESET where the DCI is detected based on the scrambling ID corresponding to the CORESET.

[0108] The UE may also classify one or more detected DCIs (e.g., DCI related to scheduling) into two groups based on the CORESET group ID. Within the group of DCIs associated with each CORESET group ID, the final DCI format may also be determined based on the same rules as in Rel-15 NR.

[0109] In addition, within this group (which may also be referred to as a PDCCH group, a DCI group, etc.), the UE may also assume that the values of C-DAI and T-DAI are determined according to specific rules. That is, the values of each DAI may be incremented independently for each PDCCH group.

[0110] The PDCCHs included in the PDCCH group may be limited to the PDCCHs related to scheduling. The PDCCHs related to scheduling may be the PDCCHs related to at least one of the DCI for scheduling the PDSCH, the DCI for activating (triggering) the SPS PDSCH, and the DCI indicating the release of the SPS.

[0111] In addition, in the present disclosure, the PDCCH group and the CORESET group can be replaced with each other.

[0112] In the second embodiment, the last DCI format associated with a specific CORESET group ID for determining the PUCCH resource may also be, for example, the last DCI format associated with the smallest or largest CORESET group ID.

[0113] In the second embodiment, the last DCI format associated with a specific CORESET group ID for determining the PUCCH resource may also be the DCI format of either the later (in other words, newer) or earlier (in other words, older) PDCCH monitoring opportunity among the DCI formats associated with any CORESET group ID.

[0114] In addition, when the last DCI formats of multiple CORESET group IDs are transmitted in the same PDCCH monitoring opportunity, the last DCI format associated with a specific CORESET group ID for determining the PUCCH resource may also be the last DCI format associated with the smallest or largest CORESET group ID in this PDCCH monitoring opportunity.

[0115] That is, in the case of using multiple TRPs and applying joint HARQ-ACK feedback, the PUCCH resource for transmitting HARQ-ACK in a certain time slot can also be determined based on the PRI included in the last DCI format, which is the last DCI format associated with a specific CORESET group ID (the smallest or largest CORESET group ID) among the DCI formats having a value of the PDSCH-to-HARQ feedback timing indication field indicating the PUCCH transmission in this time slot.

[0116] Here, the "last DCI format" associated with a certain CORESET group ID may also mean the last (in other words, corresponding to the largest index) DCI format in the case where the detected DCI formats corresponding to the PUCCH transmission in the same time slot associated with this CORESET group ID are sorted in ascending order with respect to the same PDCCH monitoring opportunity for each serving cell and then sorted in ascending order with respect to the index of the PDCCH monitoring opportunity.

[0117] In the second embodiment, the UE may also be conceived that the CORESET group ID is used for (or applied to) joint HARQ-ACK feedback. In other words, when the UE is set with the parameters of the TRP direction, it can also use these parameters to determine the PUCCH resources for joint HARQ-ACK feedback.

[0118] The second embodiment can also be applied to one or both of Scenario 1 and Scenario 2.

[0119] Figure 3 This is a diagram showing an example of the "last DCI format" in the second embodiment. In this example, the UE is set with two serving cells (CC0 - CC1). In addition, the UE is set to operate in multiple TRPs (TRP0, 1) for each cell.

[0120] In Figure 3 the PDSCH scheduled by each DCI and the PUCCH corresponding to the PDSCH are respectively represented by dashed lines. Additionally, Figure 3 the DCI in

[0121] and subsequent figures can also be replaced with DCI format 1_0, 1_1, etc.

[0122] In the UE, in slot 0 of CC0, it receives DCI from TRP0 and receives the PDSCH based on this DCI. In slot 1 of CC0, the UE receives DCI from TRP0 and receives the PDSCH based on this DCI.

[0123] In this example, the DCI of each CC (CC0, 1) transmitted in TRP0 is associated with the CORESET group ID 0, and they correspond to PDCCH group #1. The UE can also determine the reception situation from TRP0 according to the CORESET group ID 0.

[0124] In the UE, in slot 0 of CC0, it receives DCI from TRP1 and receives the PDSCH based on this DCI.

[0125] In the UE, in slot 0 of CC1, it receives DCI from TRP1 and receives the PDSCH based on this DCI. In slot 2 of CC1, the UE receives DCI from TRP1 and receives the PDSCH based on this DCI. In slot 3 of CC1, the UE receives DCI from TRP1 and receives the PDSCH based on this DCI.

[0126] In this example, the DCI of each CC (CC0, 1) transmitted in TRP1 is associated with CORESET group ID1, which corresponds to PDCCH group #2. The UE can also determine the reception situation from TRP1 based on CORESET group ID1.

[0127] In Figure 3 , it is envisaged that a PUCCH corresponding to the DCI received in time slots 0 - 3 is transmitted in time slot 4 of CC0. For example, the UE can also transmit, in time slot 4 of CC0, the DCI of PDCCH group #1 in time slots 0 - 3 and the PUCCH corresponding to PDCCH group #2 to TRP0.

[0128] In addition, the CC for transmitting the PUCCH is not limited to CC0 and can also be CC1 according to settings, etc. The TRP for transmitting the PUCCH is not limited to TRP0 and can also be TRP1 according to settings, etc. In addition, the PUCCH can also be transmitted using sub - time slots instead of time slots.

[0129] Here, the UE can also notify the correspondence between the PUCCH (or CORESET or DCI format) and the sub - time slot of the corresponding PUCCH through high - layer signaling, physical - layer signaling, or a combination of them. For example, the UE can also be set with an index related to the PUCCH (e.g., PUCCH resource ID) or a CORESET group ID associated with the CORESET ID. The UE can also determine the sub - time slot corresponding to the received DCI (PDCCH) based on the above correspondence.

[0130] For example, the UE envisages that n symbols (n is an integer) from the beginning of the time slot are set as sub - time slot #0, and the remaining symbols (e.g., 14 - n symbols from the end) are set as sub - time slot #1. In addition, the structure of such sub - time slots (the symbols equivalent to sub - time slots) can be set through high - layer signaling or can be predetermined by the specification.

[0131] The UE can also envisage that, in the case of detecting the DCI that schedules the PDSCH (and thus the PUCCH corresponding to the PDSCH), if the PUCCH resource is included in sub - time slot #1, the PUCCH is transmitted to the first TRP. In addition, the UE can also envisage that, if the PUCCH resource is included in sub - time slot #2, the PUCCH is transmitted to the second TRP. The correspondence between the TRP and the sub - time slot can also be set through high - layer signaling or can be predetermined by the specification.

[0132] In addition, the correspondence between the TRP and the PUCCH transmission timing (e.g., sub - time slot index) can also be set through high - layer signaling.

[0133] In Figure 3 it shows the index of the "last DCI format" associated with each CORESET group ID (for each CORESET group ID, for the same PDCCH monitoring occasion, the index is appended in ascending order across the serving cells (CC0 - 1), and after appending the index in ascending order across the PDCCH monitoring occasion indexes (PMO#0 - #3)).

[0134] For example, for the DCI of CORESET group ID 0, it shows #0 - #3 (DCI#0 - #3). For the DCI of CORESET group ID 1, it shows #0' - #3' (DCI#0' - #3'). That is, in this example, the last DCI format of CORESET group ID 0 (TRP0) is DCI#3, and the last DCI format of CORESET group ID 1 (TRP1) is DCI#3'.

[0135] When the "last DCI format" for PUCCH resource determination is based on the smallest CORESET group ID, the UE can also determine the PUCCH resource based on the PRI of DCI#3 corresponding to CORESET group ID 0.

[0136] When the "last DCI format" for PUCCH resource determination is based on the largest CORESET group ID, the UE can also determine the PUCCH resource based on the PRI of DCI#3' corresponding to CORESET group ID 1.

[0137] Figure 4 It is a diagram showing another example of the "last DCI format" in the second embodiment. This example is an explanation of the same situation, so repeated explanations are not repeated. Figure 3 the same situation, so repeated explanations are not repeated.

[0138] In Figure 4 the UE determines the last DCI format associated with a specific CORESET group ID for PUCCH resource determination as the DCI format of the later PDCCH monitoring occasion among the last DCI formats associated with any CORESET group ID.

[0139] That is, in this example, among DCI#3 which is the last DCI format of CORESET group ID 0 (TRP0) and DCI#3' which is the last DCI format of CORESET group ID 1 (TRP1), the UE determines the PUCCH resource based on the PRI of DCI#3' (DCI#3 is PMO#2, DCI#3' is PMO#3, so it is DCI#3') with a later PDCCH monitoring occasion.

[0140] According to the second embodiment described above, the UE can appropriately determine the "last DCI format" related to PUCCH resource determination.

[0141] <Third Embodiment>

[0142] In the third embodiment, the PUCCH resource can also be determined based on the last DCI format associated with a specific CORESET group ID. For example, the UE can also determine the last DCI format for the detected DCI according to specific rules. In the second embodiment, the last DCI format is determined for each CORESET group first, but in the third embodiment, the last DCI format is determined across CORESET groups.

[0143] In the third embodiment, the index addition of the DCI for determining the PUCCH resource can also be an index addition that applies the three directions of the frequency domain, time domain, and TRP domain (which can also be called the CORESET group domain) in an arbitrary priority order.

[0144] The following illustrates Embodiments 3-1 to 3-3:

[0145] (Embodiment 3-1) The detected DCI is index-added in the order of the TRP domain first, the frequency domain second, and the time domain third.

[0146] (Embodiment 3-2) The detected DCI is index-added in the order of the frequency domain first, the TRP domain second, and the time domain third.

[0147] (Embodiment 3-3) The detected DCI is index-added in the order of the frequency domain first, the time domain second, and the TRP domain third.

[0148] In addition, as described above, the order of the domains can also be swapped. For example, the frequency domain and the time domain can be swapped with each other.

[0149] In the third embodiment, the UE can also assume that the CORESET group ID is used for (or applied to) joint HARQ-ACK feedback. In other words, when the UE is set with the parameters of the TRP direction, it can also use these parameters to determine the PUCCH resource for joint HARQ-ACK feedback.

[0150] The third embodiment can also be applied to one or both of Scenario 1 and Scenario 2.

[0151] [Embodiment 3-1]

[0152] In the case of Embodiment 3-1, the "last DCI format" means the DCI format detected corresponding to the PUCCH transmission in the same time slot, with the same serving cell index and the same PDCCH monitoring occasion. The index is appended in ascending order across the CORESET group ID, then the index is appended in ascending order across the serving cells for the same PDCCH monitoring occasion, and further, the index is appended in ascending order across the indices of the PDCCH monitoring occasions. In this case, the last (in other words, the equivalent of the largest index) DCI format is obtained.

[0153] The "last DCI format", in other words, is equivalent to the detected DCI format corresponding to the PUCCH transmission in the same time slot. It is the last DCI format obtained by arranging them in order starting from a smaller CORESET group ID, a more forward (smaller) CC index, and a more forward (smaller) PDCCH monitoring period.

[0154] Figure 5 It is a diagram showing another example of the "last DCI format" in Embodiment 3-1. This example is an explanation of a situation similar to Figure 3 (the time slot for receiving DCI is slightly different), so repeated explanations will not be repeated.

[0155] In Figure 5 it shows the index related to the "last DCI format" (for the same serving cell index and the same PDCCH monitoring occasion, the index is appended in ascending order across the CORESET group ID (CORESET group ID 0-1), the index is appended in ascending order across the serving cell indices (CC0-1) for the same PDCCH monitoring occasion, and the index is appended in ascending order across the indices of the PDCCH monitoring occasions (PMO#0-#3)).

[0156] According to this index appending, for example, first for CC0 of PMO#0, the DCI of CORESET group ID 0 is determined as DCI#0, and the DCI of CORESET group ID 1 is determined as DCI#1. Then, for CC1 of PMO#0, the DCI of CORESET group ID 0 is determined as DCI#2, and the DCI of CORESET group ID 1 is determined as DCI#3.

[0157] In this example, the UE determines that the DCI (DCI#8) transmitted from TRP0 in CC1 of time slot 3 (in other words, corresponding to CORESET group ID 0) is the last DCI format. The UE can also determine the PUCCH resource in time slot 4 based on the PRI of this last DCI format.

[0158] In addition, in Embodiment 3-1, the UE may also be considered to mean that in the DCI of a specific PDCCH monitoring opportunity for PUCCH transmission in the same time slot, the PRI field in the DCI is less than 3 bits or does not include the PRI field (the PRI field is 0 bits). For example, when the UE receives a DCI corresponding to K1 = X (X>0), for the detected DCI corresponding to the PUCCH transmission in the same time slot as the PUCCH transmission of this DCI, it may also be considered that the PRI field of the DCI corresponding to a value of K1 greater than or equal to X is 0 bits.

[0159] The reason is that, according to Embodiment 3-1, the "last DCI format" is selected from the DCI corresponding to a larger PMO index. Therefore, for a smaller PMO index with a lower probability of becoming the last DCI format, there is no problem even if it does not include the PRI. Of course, in the case where all the DCI corresponding to a larger PMO are misdetected, the DCI corresponding to a smaller PMO may become the last DCI format. However, when multiple DCI corresponding to a larger PMO are transmitted, the probability of making a mistake in all of them is very small.

[0160] Therefore, in the case of adopting the index addition of Embodiment 3-1, for the DCI of a specific PMO, it is also possible to reduce the 3-bit PRI field that has always been included in the DCI format 1_0 / 1_1 in the existing Rel-15 NR. At this time, the error rate of the DCI with the reduced PRI field can be improved, and an improvement in communication throughput can be expected.

[0161] [Embodiment 3-2]

[0162] In the case of Embodiment 3-2, the "last DCI format" means that for the detected DCI format corresponding to the PUCCH transmission in the same time slot, for the same CORESET group ID and the same PDCCH monitoring opportunity, the index is appended in ascending order across the serving cell index, and then for the same PDCCH monitoring opportunity, the index is appended in ascending order across the CORESET group ID. Furthermore, the "last" (in other words, the equivalent of the largest index) DCI format in the case where the index is appended in ascending order across the index of the PDCCH monitoring opportunity.

[0163] The "last DCI format", in other words, is equivalent to the last DCI format obtained by arranging in order the detected DCI formats corresponding to the PUCCH transmission in the same time slot, starting from a smaller CORESET group ID, a smaller CC index (more forward), and a more forward (smaller) PDCCH monitoring period.

[0164] Figure 6This is a diagram showing an example of the "last DCI format" in Embodiment 3-2. This example is an explanation of the same situation as Figure 5 , so repeated explanations will not be repeated.

[0165] In Figure 6 , an index related to the "last DCI format" is shown (for the same CORESET group ID and the same PDCCH monitoring occasion, an index is appended in ascending order over the serving cell index (CC0-1), and for the same PDCCH monitoring occasion, an index is appended in ascending order over the CORESET group ID (CORESET group ID0-1), and after appending an index in ascending order over the index of the PDCCH monitoring occasion (PMO#0-#3), this obtained index).

[0166] According to this index appending, for example, first for CORESET group ID0 of PMO#0, the DCI of CC0 is determined as DCI#0, and the DCI of CC1 is determined as DCI#1. Then, for CORESET group ID1 of PMO#0, the DCI of CC0 is determined as DCI#2, and the DCI of CC1 is determined as DCI#3.

[0167] In this example, the UE determines that the DCI (DCI#8) transmitted from TRP1 in CC0 of time slot 3 is the last DCI format. The UE can also determine the PUCCH resource of time slot 4 based on the PRI of this last DCI format.

[0168] In addition, in Embodiment 3-2, the UE can also assume that, among the DCIs indicating PUCCH transmission in the same time slot, the DCI in a specific PDCCH monitoring occasion has a PRI field less than 3 bits or does not include a PRI field (the PRI field is 0 bits). This has also been explained in Embodiment 3-1, so repeated explanations will not be repeated.

[0169] [Embodiment 3-3]

[0170] In the case of Embodiment 3-3, the "last DCI format" means the last (in other words, corresponding to the largest index) DCI format in the case where the detected DCI format corresponding to PUCCH transmission in the same time slot is appended with an index in ascending order over the serving cell index for the same CORESET group ID and the same PDCCH monitoring occasion, and further appended with an index in ascending order over the index of the PDCCH monitoring occasion for the same CORESET group ID, and then appended with an index in ascending order over the CORESET group ID.

[0171] "Last DCI format", if presented otherwise, is equivalent to the last DCI format obtained by arranging in order the detected DCI formats corresponding to PUCCH transmissions in the same time slot, starting from those with a smaller CORESET group ID, an earlier (smaller) PDCCH monitoring period, and an earlier (smaller) CC index.

[0172] Figure 7 is a diagram showing an example of the "last DCI format" in Embodiment 3-3. This example is related to Figure 5 similar (the time slots for receiving DCI are somewhat different. Specifically, compared with Figure 5 , since in CC0 of PMO#3 the UE does not receive DCI from TRP1), so repeated explanations will not be repeated.

[0173] In Figure 7 , an index related to the "last DCI format" is shown (for the same CORESET group ID and the same PDCCH monitoring occasion, an index is appended in ascending order across the serving cell indices (CC0-1), then for the same CORESET group ID, an index is appended in ascending order across the indices of the PDCCH monitoring occasions (PMO#0-#3), and further, an index is appended in ascending order across the CORESET group IDs (CORESET group ID0-1)).

[0174] According to this index attachment, for example, first for CORESET group ID0, the DCI for CC0 of PMO#0 is determined as DCI#0, the DCI for CC1 of PMO#0 is determined as DCI#1, the DCI for CC0 of PMO#1 is determined as DCI#2, the DCI for CC1 of PMO#2 is determined as DCI#3, and the DCI for CC1 of PMO#3 is determined as DCI#4. Then, for CORESET group ID1, the DCI for CC0 of PMO#0 is determined as DCI#5, the DCI for CC1 of PMO#0 is determined as DCI#6, and the DCI for CC1 of PMO#2 is determined as DCI#7.

[0175] In this example, the UE determines that the DCI (DCI#7) transmitted from TRP1 in CC1 of time slot 2 is the last DCI format. The UE can also determine the PUCCH resources for time slot 4 based on the PRI of this last DCI format.

[0176] In addition, in Embodiment 3-3, the UE may also assume that the DCI in a specific CORESET group ID has a PRI field less than 3 bits or does not include a PRI field (the PRI field is 0 bits). For example, the UE may also assume that when receiving a DCI corresponding to CORESET group ID = X (X>0), for the detected DCI corresponding to the PUCCH transmission in the same time slot as the PUCCH transmission of this DCI, the PRI field of the DCI corresponding to a value of CORESET group ID less than X is 0 bits.

[0177] The reason is that according to Embodiment 3-3, the "last DCI format" is selected from a larger CORESET group ID. Therefore, for a CORESET group ID with a lower probability of becoming the last DCI format, there will be no problem even if it does not include a PRI. Of course, in the case where all DCIs corresponding to a larger CORESET group ID are misdetected, the DCI corresponding to a smaller CORESET group ID may become the last DCI format. However, when multiple DCIs corresponding to a larger CORESET group ID are transmitted, the probability of misdetecting all of them is very small.

[0178] In addition, for the UE, when the base station transmits a DCI with a reduced PRI field for a certain CORESET group ID, it may also control the transmission of a specified number or more of DCIs. These DCIs are the DCIs corresponding to a CORESET group ID larger than this CORESET group ID and indicate the PUCCH transmission in the same time slot as the DCI with the reduced PRI field. According to this control, the probability that the UE can receive a DCI corresponding to a larger CORESET group ID that can be selected as the "last DCI format" can be appropriately increased. In addition, the information about this specific number can be notified to the UE through higher-layer signaling or can be predetermined by the specification.

[0179] Therefore, in the case of adopting the index addition of Embodiment 3-3, for the DCI of a specific CORESET group ID, the 3-bit PRI field that is always included in DCI format 1_0 / 1_1 in the existing Rel-15 NR can also be reduced. At this time, the error rate of the DCI with the reduced PRI field can be improved, and an improvement in communication throughput can be expected.

[0180] According to the third embodiment described above, the UE can appropriately determine the "last DCI format" related to the PUCCH resource determination.

[0181] <Other Embodiments>

[0182] The UE may also report UE capability information (UE capability (UEcapability)) containing information related to at least one of the following to the network:

[0183] · Whether it supports the simultaneous reception of multiple DCIs (multi-DCI, multi-PDCCH) (e.g., whether it allows the detection of more than 2 DCI formats of multiple PDCCHs where the initial symbols in the same time slot are received in the same symbol),

[0184] · Whether it supports the simultaneous reception of multiple DCIs that are not in a specific QCL relationship (e.g., not QCL type D),

[0185] · Whether it supports NCJT for PDSCH (in other words, the simultaneous reception of multiple PDSCHs (codewords) that are not in a specific QCL relationship (e.g., not QCL type D)),

[0186] · Whether it supports separate HARQ-ACK,

[0187] · Whether it supports joint HARQ-ACK,

[0188] · Whether it supports a separate HARQ-ACK codebook,

[0189] · Whether it supports a joint HARQ-ACK codebook,

[0190] · Whether it supports single DCI,

[0191] · Whether it supports multi-DCI,

[0192] · Whether it supports sub-slot-based HARQ feedback,

[0193] · Whether it supports slot-based HARQ feedback,

[0194] · The number of DCIs that the UE can detect (or decode) during a specific PDCCH monitoring period or in the same symbol (e.g., OFDM symbol),

[0195] · The number of DCIs that the UE can detect (or decode) during a specific PDCCH monitoring period or in the same symbol (e.g., OFDM symbol) that are not in a specific QCL relationship (e.g., not QCL type D),

[0196] · The number of PDSCHs (or codewords) that the UE can detect (or decode) in the same symbol (e.g., OFDM symbol),

[0197] · The number of PDSCHs (or codewords) that the UE can detect (or decode) in the same symbol (e.g., OFDM symbol) that are not in a specific QCL relationship (e.g., not QCL type D).

[0198] The UE may also be conceived as applying (or being set to apply) at least one of the above-described embodiments in the case where at least one of the above-described UE capabilities is reported. The network may also notify the UE that has reported at least one of the above-described UE capabilities of information for activating an operation based on at least one of the above-described embodiments.

[0199] In the case where joint HARQ-ACK feedback and one of the joint HARQ-ACK feedbacks are not set (or if not activated or deactivated), the UE may also be conceived as being set (or activated) as the other.

[0200] In addition, in the present disclosure, the time resource (e.g., time slot) of the PUCCH corresponding to the DCI may also be determined based on the value of the PDSCH-to-HARQ feedback timing indication field of the DCI, may also be determined based on the value of other fields, may also be determined based on higher layer signaling, and may also be determined based on specifications.

[0201] For example, the time resource of the PUCCH corresponding to the DCI may also be determined based on at least one of the CORESET group ID, the DCI (PDCCH), or the DMRS of the PDSCH (e.g., DMRS sequence, resource), etc. Therefore, in the present disclosure, the "DCI format having a value of the PDSCH-to-HARQ feedback timing indication field indicating a PUCCH transmission in a (certain) time slot" may also be interchanged with the "DCI format corresponding to the PUCCH transmission in a (certain) time slot".

[0202] Note that the large / small, late / early, etc. in the present disclosure can be individually swapped and replaced (e.g., at least one "large" in the present disclosure can also be replaced with "small").

[0203] In addition, in the present disclosure, it may also be conceived that a UE having multiple TRPs set determines at least one of the TRP corresponding to the DCI, the TRP corresponding to the PDSCH scheduled by the DCI, or the UL transmission (PUCCH, PUSCH, SRS, etc.) based on at least one of the following:

[0204] · The value of a specific field (e.g., a field specifying a TRP, an antenna port field, a PRI) included in the DCI,

[0205] · The DMRS corresponding to the scheduled PDSCH / PUSCH (e.g., the sequence, resource, CDM group, DMRS port, DMRS port group, etc. of the DMRS),

[0206] ·The DMRS corresponding to the PDCCH for which DCI has been transmitted (e.g., the sequence, resources, CDM group, DMRS ports, DMRS port group, etc. of the DMRS),

[0207] ·The CORESET that has received DCI (e.g., the ID of the CORESET, scrambling ID (which can also be replaced by a sequence ID), resources, etc.).

[0208] In the present disclosure, a single PDCCH (DCI) may also be referred to as a PDCCH (DCI) of the first scheduling type (e.g., scheduling type A (or type 1)). Additionally, multiple PDCCHs (DCIs) may also be referred to as PDCCHs (DCIs) of the second scheduling type (e.g., scheduling type B (or type 2)).

[0209] In the present disclosure, it can also be envisioned that a single PDCCH is supported when multiple TRPs utilize an ideal backhaul. It can also be envisioned that multiple PDCCHs are supported when non-ideal backhaul is utilized among multiple TRPs.

[0210] In addition, an ideal backhaul may also be referred to as DMRS port group type 1, reference signal association group type 1, antenna port group type 1, etc. A non-ideal backhaul may also be referred to as DMRS port group type 2, reference signal association group type 2, antenna port group type 2, etc. The names are not limited to these.

[0211] (Wireless communication system)

[0212] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods of the above-described various embodiments of the present disclosure.

[0213] Figure 8 It is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), etc.

[0214] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0215] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0216] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0217] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, quantity, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0218] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) that uses multiple Component Carriers (CCs).

[0219] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may also be a sub-6GHz band, and FR2 may also be a band above 24GHz. In addition, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a band higher than FR2.

[0220] In addition, the user terminal 20 may also communicate in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0221] The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, 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 the relay station may also be referred to as an IAB node.

[0222] 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, for example, also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0223] The user terminal 20 may also be a terminal supporting at least one of communication modes such as LTE, LTE-A, 5G, etc.

[0224] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also 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. can also be used.

[0225] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be applied to the wireless access methods in the UL and DL.

[0226] In the wireless communication system 1, as a downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. that are shared among the respective user terminals 20 can also be used.

[0227] Furthermore, in the wireless communication system 1, as an uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. that are shared among the respective user terminals 20 can also be used.

[0228] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, the Master Information Block (MIB) can be transmitted through PBCH.

[0229] Low-layer control information can also be transmitted through PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of PDSCH and PUSCH.

[0230] In addition, the DCI that schedules PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, PDSCH can also be interpreted as DL data, and PUSCH can also be interpreted as UL data.

[0231] In the detection of PDCCH, the Control Resource Set (CORESET) and the search space can also be utilized. CORESET corresponds to the resource for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0232] One search space can also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure can also be replaced with each other.

[0233] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., also referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) can also be transmitted through PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through PRACH.

[0234] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". Further, it can also be expressed that "Physical" is not included at the beginning of various channels.

[0235] In the wireless communication system 1, synchronization signal (Synchronization Signal (SS)), downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. In the wireless communication system 1, as the DL-RS, cell-specific reference signal (Cell-specific Reference Signal (CRS)), channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), demodulation reference signal (DeModulation Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0236] The synchronization signal can, for example, also be at least one of the primary synchronization signal (Primary Synchronization Signal (PSS)) and the secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. can also be referred to as reference signals.

[0237] In addition, in the wireless communication system 1, as the uplink reference signal (UL-RS), it is also possible to transmit a reference signal for measurement (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, the DMRS can also be referred to as a UE-specific reference signal.

[0238] (Base station)

[0239] Figure 9 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0240] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0241] The control unit 110 implements the overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0242] The control unit 110 may also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 may also control the transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, a sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0243] The transmission and reception unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and reception unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission and reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0244] The transmission and reception unit 120 may be configured as an integrated transmission and reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may also be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may also be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0245] The transmission and reception antenna 130 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0246] The transmission and reception unit 120 may also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission and reception unit 120 may also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0247] The transmission and reception unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0248] The transmission and reception unit 120 (transmission processing unit 1211) may, for example, also perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0249] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0250] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0251] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filtering, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0252] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0253] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0254] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also obtain, transmit, etc. user data (user plane data), control plane data, etc. for the user terminal 20.

[0255] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0256] In addition, the transmission / reception unit 120 may also transmit a PDSCH to the user terminal 20. The control unit 110 may also control the PDSCH such that the PDSCH coincides with the PDSCH transmitted from other base stations 10 in at least one of time resources and frequency resources.

[0257] (User Terminal)

[0258] Figure 10 FIG. is an example showing the structure 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, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0259] In addition, in this example, the functional blocks of the characteristic part in this embodiment are mainly shown, and it can also be assumed that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0260] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. that can be explained based on the common knowledge in the technical field related to this disclosure.

[0261] The control unit 210 can also control the generation, mapping, etc. of signals. The control unit 210 can also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0262] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that can be explained based on the common knowledge in the technical field related to this disclosure.

[0263] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit can also be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0264] The transmission / reception antenna 230 can be composed of an antenna that can be explained based on the common knowledge in the technical field related to this disclosure, such as an array antenna, etc.

[0265] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0266] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of the transmission beam and the reception beam.

[0267] The transmission / reception unit 220 (transmission processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0268] The transmission / reception unit 220 (transmission processing unit 2211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0269] In addition, regarding whether to apply DFT processing, it may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when the transform precoding is active (enabled), the transmission / reception unit 220 (transmission processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) may not perform DFT processing as the above-mentioned transmission processing.

[0270] The transmission / reception unit 220 (RF unit 222) may also perform modulation to the radio frequency band, filtering processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0271] On the other hand, the transmission / reception unit 220 (RF unit 222) may also perform amplification, filtering processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0272] The transmission / reception unit 220 (reception processing unit 2212) may also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0273] The transmitting and receiving unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also perform measurements on 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.

[0274] In addition, the transmitting unit and the receiving unit of the user terminal 20 of the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230.

[0275] In addition, the transmitting and receiving unit 220 may also receive a first PDSCH (Physical Downlink Shared Channel) from a first Transmission / Reception Point (TRP) and a second PDSCH from a second TRP, where the second PDSCH overlaps with the first PDSCH in at least one of time resources and frequency resources. That is, the transmitting and receiving unit 220 may also receive multiple PDSCHs.

[0276] The control unit 210 may also perform control of transmitting a first Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) for the first PDSCH and a second HARQ-ACK for the second PDSCH to one of the first TRP and the second TRP (joint HARQ-ACK).

[0277] The control unit 210 may also determine the last DCI format associated with a specific group index (e.g., at least one of a CORESET group ID, a PDCCH group index, a TRP index, etc.) from the detected Downlink Control Information (DCI) formats corresponding to the transmission of the uplink control channel (PUCCH) in the same time slot.

[0278] In addition, the transmitting and receiving unit 220 may also use a resource (e.g., a PUCCH resource) corresponding to the last DCI format to transmit the uplink control channel. Joint HARQ-ACK feedback may also be performed in the uplink control channel.

[0279] The control unit 210 may also determine the DCI format corresponding to the largest index as the last DCI format. The DCI format corresponding to the largest index is the DCI format corresponding to the largest index when, for the detected DCI formats (e.g., one or more DCI formats 1_0, 1_1, etc.), for the same downlink control channel monitoring occasion (PDCCH monitoring occasion (PMO)), the index is appended in ascending order over the serving cell index and then the index is appended in ascending order over the index of the downlink control channel monitoring occasion.

[0280] The control unit 210 may also determine the last DCI format from among a plurality of last DCI formats, where the plurality of last DCI formats are determined for each group index from the detected DCI formats.

[0281] The control unit 210 may also determine the last DCI format as the one with a later corresponding downlink control channel monitoring occasion among the plurality of last DCI formats.

[0282] The control unit 210 determines the DCI format corresponding to the largest index as the last DCI format. The DCI format corresponding to the largest index is the DCI format corresponding to the largest index when, for the detected DCI formats, for the same serving cell index and the same downlink control channel monitoring occasion, the index is appended in ascending order over the group index, then for the same downlink control channel monitoring occasion, the index is appended in ascending order over the serving cell index, and further the index is appended in ascending order over the index of the downlink control channel monitoring occasion.

[0283] (Hardware Structure)

[0284] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, the implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected with these multiple devices. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0285] Here, in the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuration (setting), reconfiguration (re - setting), allocation (allocating, mapping), assignment, etc., but are not limited to these. For example, a functional block (structural unit) that implements the transmission function can also be called a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0286] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 11 It is a diagram showing an example of the hardware structure of a base station and a user terminal related to an embodiment. The above - mentioned base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0287] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the figure, or can be configured not to include some devices.

[0288] For example, only one processor 1001 is shown, but there can also be multiple processors. In addition, the processing can be executed by one processor, or can be executed simultaneously, sequentially, or by other means by two or more processors. In addition, the processor 1001 can also be implemented by one or more chips.

[0289] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls the 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, thereby realizing it.

[0290] The processor 1001, for example, operates the operating system to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0291] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes the computer to execute at least a part of the operations described in the above embodiments can be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0292] The memory 1002 may also be a computer-readable recording medium, and may be constituted by at least one of, for example, a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and 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 a program (program code), software module, etc. executable for implementing the wireless communication method according to one embodiment of the present disclosure.

[0293] The storage 1003 may also be a computer-readable recording medium, and may be constituted by at least one of, for example, a flexible disc, a floppy (registered trademark) disc, an optical disc (e.g., a compact disc (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0294] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separately installed by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0295] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 may also have an integrated structure (e.g., a touch panel).

[0296] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between each device.

[0297] 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 a part or all of each functional block may also be implemented by this hardware. For example, the processor 1001 may also be implemented by at least one of these hardwares.

[0298] (Variant example)

[0299] In addition, terms described in this disclosure and terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal can also be abbreviated as RS, and can also be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0300] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) that make up the radio 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) independent of the numerology.

[0301] Here, the numerology may also refer to communication parameters applied in at least one of the transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transmitter-receiver in the frequency domain, a specific windowing process performed by a transmitter-receiver in the time domain, etc.

[0302] 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 the numerology.

[0303] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. 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.

[0304] A radio frame, subframe, time slot, mini-slot, and symbol all represent time units for transmitting signals. A radio frame, subframe, time slot, mini-slot, and symbol may also use other corresponding names. In addition, time units such as frames, subframes, time slots, mini-slots, and symbols in the present disclosure can also be replaced with each other.

[0305] For example, a subframe may also be referred to as a TTI, multiple consecutive subframes may also be referred to as a TTI, a time slot or a mini-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 existing LTE, may also be a period shorter than 1 ms (e.g., 1 - 13 symbols), or may also be a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a subframe, but may be referred to as a time slot, mini-slot, etc.

[0306] Here, a TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in units of TTI to each user terminal. In addition, the definition of a TTI is not limited to this.

[0307] A TTI may also be a transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and may also become a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (e.g., number of symbols) in which a transport block, code block, codeword, etc. is actually mapped may also be shorter than the TTI.

[0308] In addition, when a time slot or a mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-slots) may also become the minimum time unit for scheduling. In addition, the number of time slots (number of mini-slots) constituting the minimum time unit of this scheduling can also be controlled.

[0309] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-time slot, time slot, etc.

[0310] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be interpreted as a TTI having a TTI length less than that of the long TTI and more than 1 ms.

[0311] 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, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0312] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a time 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.

[0313] In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0314] In addition, a resource block may also be composed of one or more resource elements (REs). For example, one RE may also be a radio resource area of a subcarrier and a symbol.

[0315] A bandwidth part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the index of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be additionally numbered within that BWP.

[0316] An UL BWP (BWP for UL) and a DL BWP (BWP for DL) may also be included in a BWP. For a UE, one or more BWPs may also be set within one carrier.

[0317] At least one of the set BWPs may be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be interpreted as "BWP".

[0318] In addition, the structures such as the above-mentioned radio frames, sub-frames, time slots, mini time slots, and symbols are merely illustrative. For example, the number of sub-frames included in a radio frame, the number of time slots in each sub-frame 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 sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0319] In addition, the information, parameters, etc. described in this disclosure can be represented by absolute values, relative values with respect to a specific value, or can also be represented by corresponding other information. For example, radio resources can also be indicated by a specific index.

[0320] In this disclosure, the names used for parameters, etc. are not restrictive names in all aspects. In addition, mathematical expressions using these parameters, etc. can also be different from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name. Therefore, the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0321] The information, signals, etc. described in this disclosure can also be represented by any one of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0322] In addition, information, signals, etc. can be output to at least one of the higher layer (upper layer) to the lower layer (lower layer) and from the lower layer to the higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0323] The input and output information, signals, etc. can be stored in a specific location (such as a memory), or can be managed by a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0324] The notification of information is not limited to the manners / embodiments described in this disclosure, and other methods can also be used. For example, the notification of information in this disclosure can 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.

[0325] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message, and for example, it can also be an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Re - setting) message, etc. In addition, MAC signaling can also be notified, for example, by using a MAC Control Element (MAC CE).

[0326] In addition, the notification of specific information (e.g., the notification of "is X") is not limited to explicit notification, and can also be performed implicitly (e.g., by not performing the notification of the specific information, or by the notification of other information).

[0327] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true - false value (Boolean value) represented by true or false, and can also be made by a numerical comparison (e.g., comparison with a specific value).

[0328] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, processes, functions, etc.

[0329] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0330] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0331] In this disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0332] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0333] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each of these smaller areas can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services within that coverage range.

[0334] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal" can be used interchangeably.

[0335] In some cases, a mobile station is also referred to as a subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0336] 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. Additionally, at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), may also be a moving body that moves in an unmanned manner (e.g., a drone, a self-driving vehicle, etc.), and may also be a robot (humanoid or non-humanoid). Additionally, at least one of the base station and the mobile station also includes a device that does not necessarily move during 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.

[0337] Furthermore, the base station in the present disclosure may also be interpreted as a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (e.g., may also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various aspects / embodiments of the present disclosure can also be applied. In this case, it may also be a structure in which the user terminal 20 has the functions of the above-mentioned base station 10. Additionally, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. can also be interpreted as a side channel.

[0338] Similarly, the user terminal in the present disclosure may also be interpreted as a base station. In this case, it may also be a structure in which the base station 10 has the functions of the above-mentioned user terminal 20.

[0339] In the present disclosure, an action performed by the base station may sometimes be performed by its upper node according to the situation. Apparently, in a network including one or more network nodes having a base station, various actions for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0340] Each mode / embodiment described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of each mode / embodiment described in the present disclosure can also be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0341] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth 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, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (e.g., a combination of LTE or LTE-A and 5G) for application.

[0342] The description "based on" used in the present disclosure does not mean "only based on" unless specifically stated otherwise. In other words, the description "based on" means both "only based on" and "at least based on".

[0343] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not comprehensively define the quantity or order of these elements. These terms can be used in this disclosure as a convenient method for distinguishing between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must take precedence over the second element in a certain form.

[0344] The term "determining" used in this disclosure includes various actions in some cases. For example, "determining" can also be regarded as a situation of "determining" for judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structure), ascertaining, etc.

[0345] In addition, "determining" can also be regarded as a situation of "determining" for receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc.

[0346] In addition, "determining" can also be regarded as a situation of "determining" for resolving, selecting, choosing, establishing, comparing, etc. That is to say, "determining" can also be regarded as a situation of "determining" for some actions.

[0347] In addition, "determining" can also be interpreted as "assuming", "expecting", "considering", etc.

[0348] As used in this disclosure, terms such as "connected" and "coupled", or any variations thereof, denote all direct or indirect connections or couplings between two or more elements, and can include the case where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of these. For example, "connected" can also be interpreted as "access".

[0349] In this disclosure, when connecting two elements, it can be considered that one or more wires, cables, printed electrical connections, etc. are used, and electromagnetic energy with wavelengths in the radio frequency domain, microwave region, and optical (both visible and invisible) regions, etc., are used as several non-limiting and non-exhaustive examples to "connect" or "couple" to each other.

[0350] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, this term can also mean "A and B are each different from C". Terms such as "separated" and "coupled" can be similarly interpreted as "different".

[0351] In this disclosure, when using the terms "include", "including", and their variations, these terms, like the term "comprising", are meant in an inclusive sense. Further, the term "or" used in this disclosure does not mean the exclusive or sense.

[0352] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0353] As described above, the invention related to this disclosure has been described in detail. However, for those skilled in the art, the invention related to this disclosure is clearly not limited to the embodiments described in this disclosure. The invention related to this disclosure can be implemented in the form of modifications and changes without departing from the gist and scope of the present invention determined based on the claims. Therefore, the description of this disclosure is for illustrative purposes and does not carry any restrictive meaning for the invention related to this disclosure.

Claims

1. A terminal, characterized in that, comprising: a control unit that determines the DCI format corresponding to the largest index as the final DCI format, where the DCI format corresponding to the largest index is one or more detected downlink control information DCI formats corresponding to the transmission of an uplink control channel in the same time slot, and for the same serving cell index and the same downlink control channel monitoring occasion, indexes are appended in ascending order across multiple CORESET group indexes, for the same downlink control channel monitoring occasion, indexes are appended in ascending order across multiple serving cell indexes, and further indexes are appended in ascending order across the indexes of multiple downlink control channel monitoring occasions; and a transmission unit that transmits the uplink control channel using the resources corresponding to the final DCI format.

2. A wireless communication method for a terminal, characterized in that, comprising: a step of determining the DCI format corresponding to the largest index as the final DCI format, where the DCI format corresponding to the largest index is one or more detected downlink control information DCI formats corresponding to the transmission of an uplink control channel in the same time slot, and for the same serving cell index and the same downlink control channel monitoring occasion, indexes are appended in ascending order across multiple CORESET group indexes, for the same downlink control channel monitoring occasion, indexes are appended in ascending order across multiple serving cell indexes, and further indexes are appended in ascending order across the indexes of multiple downlink control channel monitoring occasions; and a step of transmitting the uplink control channel using the resources corresponding to the final DCI format.

3. A base station, characterized in that, comprising: a transmission unit that transmits one or more downlink control information DCI formats corresponding to the reception of an uplink control channel in the same time slot; and a reception unit that receives the uplink control channel transmitted using the resources corresponding to the final DCI format, where the final DCI format is the DCI format corresponding to the largest index in the case where, for the one or more DCI formats, indexes are appended in ascending order across multiple CORESET group indexes for the same serving cell index and the same downlink control channel monitoring occasion, indexes are appended in ascending order across multiple serving cell indexes for the same downlink control channel monitoring occasion, and further indexes are appended in ascending order across the indexes of multiple downlink control channel monitoring occasions.

4. A system having a terminal and a base station, characterized in that, The terminal comprises: A control unit determines the DCI format corresponding to the largest index as the final DCI format, where the DCI format corresponding to the largest index is one or more detected downlink control information DCI formats corresponding to the transmission of an uplink control channel in the same time slot. For the same serving cell index and the same downlink control channel monitoring occasion, indexes are appended in ascending order across multiple CORESET group indexes. For the same downlink control channel monitoring occasion, indexes are appended in ascending order across multiple serving cell indexes. Furthermore, for the indexes of multiple downlink control channel monitoring occasions, the DCI format corresponding to the largest index in the case where indexes are appended in ascending order; And A transmission unit transmits the uplink control channel using resources corresponding to the final DCI format. The base station has: A reception unit receives the uplink control channel.

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