Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure comprises: a transmission unit that transmits a random access channel on the basis of a first downlink control channel; and a control unit that, in a case of performing a detection of downlink control information in response to the transmission of the random access channel, assumes that the first downlink control channel and a second downlink control channel providing the downlink control information are of a pseudo collocation. The control unit determines the first downlink control channel and second downlink control channel having the pseudo collocation on the basis of at least one of whether or not the first downlink control channel is repetitively transmitted and whether or not the second downlink control channel is repetitively transmitted.

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [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 [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs) will use one or more panels (multi-panels) to perform DL transmissions (e.g., PDSCH transmissions) to terminals (user terminals, User Equipment (UE)).

[0006] In addition, in NR, it is assumed that repeated transmission is applied to a predetermined channel (e.g., PDCCH). For example, it is conceivable to control the schedule of DL transmission / UL transmission using multiple PDCCHs to which repeated transmission is applied from a multi-panel / TRP.

[0007] However, in the current NR specifications, there has been insufficient consideration of how to control repeated transmissions from one or more TRPs.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method that can appropriately perform communication even when repeated transmission is applied to DL channels transmitted from one or more TRPs. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes: providing first downlink control information instructing cancellation of the first UL transmission; First downlink control channel a receiving unit for receiving the first Downstream control information When the first UL transmission is canceled based on the instruction, it is determined that the second UL transmission is not scheduled on a symbol including the symbol of the canceled first UL transmission by the second downlink control information. a control unit for controlling the before The first downlink control channel If the reception includes two downlink control channel candidates, provide the second downlink control information. Second Downlink Control Channel The last symbol of the reception is arranged after the first symbol of the earlier downlink control channel candidate in the time domain out of the two downlink control channel candidates. do. [Effects of the Invention]

[0010] According to one aspect of the present disclosure, communication can be performed appropriately even when repeated transmission is applied to DL channels transmitted from one or more TRPs. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of scheduling control of a physical shared channel based on PDCCH / DCI. [Figure 2] 2A-2D illustrate an example of a multi-TRP scenario. [Figure 3] FIG. 3 is a diagram illustrating an example of PDCCH repeated transmission. [Figure 4] FIG. 4 is a diagram showing an example of communication control using PDCCH repetition in this embodiment. [Figure 5] FIG. 5 is a diagram showing another example of communication control using PDCCH repetition in this embodiment. [Figure 6] FIG. 6 is a diagram showing an example of higher layer parameters related to search spaces. [Figure 7] FIG. 7 is a diagram illustrating an example of PDCCH repetition control. [Figure 8] FIG. 8 is a diagram illustrating an example of PDCCH repetition control in the first aspect. [Figure 9] FIG. 9 is a diagram showing an example of the transmission timing of a PDCCH that instructs cancellation of PUSCH / SRS transmission and a PDCCH that schedules PUSCH / SRS transmission. [Figure 10] FIG. 10 is a diagram illustrating an example of PDCCH repetition control in the second aspect. [Figure 11] FIG. 11 is a diagram illustrating an example of a case where DCI detection is performed in response to a PRACH transmission. [Figure 12] FIG. 12 is a diagram illustrating an example of PDCCH repetition control in the third example. [Figure 13] FIG. 13 is a diagram illustrating another example of PDCCH repetition control in the third aspect. [Figure 14]FIG. 14 is a diagram illustrating an example of a QCL assumption when DCI detection is performed in response to a PRACH transmission. [Figure 15] FIG. 15 is a diagram illustrating an example of PDCCH repetition control in the fourth aspect. [Figure 16] FIG. 16 is a diagram illustrating another example of PDCCH repetition control in the fourth aspect. [Figure 17] FIG. 17 is a diagram illustrating another example of PDCCH repetition control in the fourth aspect. [Figure 18] FIG. 18 is a diagram illustrating another example of PDCCH repetition control in the fourth aspect. [Figure 19] 19A and 19B are diagrams showing an example of association between values ​​notified by higher layer parameters and specific parameters. [Figure 20] 20A to 20D are diagrams illustrating an example of PDCCH repetition settings in the fifth aspect. [Figure 21] 21A to 21D are diagrams illustrating other examples of PDCCH repetition settings in the fifth aspect. [Figure 22] FIG. 22 is a diagram illustrating another example of the setting of PDCCH repetition in the fifth aspect. [Figure 23] FIG. 23 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 24] FIG. 24 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 25] FIG. 25 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 26] FIG. 26 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 27] FIG. 27 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] <Time domain resource allocation> In existing systems (e.g., Rel. 15), time-domain resource allocation information for a physical shared channel (at least one of a PDSCH and a PUSCH) is included in downlink control information (DCI). A network (e.g., a base station) uses a predetermined field (e.g., a TDRA field) included in the DCI to notify a UE of information regarding the time-domain resource in which the physical shared channel scheduled in the DCI is scheduled.

[0013] The information regarding the time domain resource may include, for example, at least one of information indicating the offset between the DCI and the physical shared channel (e.g., slot offset K0), information indicating the start symbol (e.g., start symbol S), and information indicating the length of the physical shared channel (e.g., length L).

[0014] Each bit information (or code point) notified in the TDRA field may be associated with a different time domain resource allocation candidate (or entry). For example, a table (e.g., a TDRA table) in which each bit information is associated with the time domain resource allocation candidates (K0, S, L) may be defined. The time domain resource allocation candidates may be predefined in a specification or may be notified / configured to the UE by higher layer signaling.

[0015] [PDSCH] The UE may determine a row index (entry number or entry index) in a predetermined table based on the value of the TDRA field in the DCI (e.g., DCI format 1_0 / 1_1 / 1_2). The predetermined table may include at least one of information indicating a time offset (e.g., slot offset K0) between the DCI and the PDSCH scheduled by the DCI, information indicating a mapping type of the PDSCH, and a start symbol S and a time length L of the PDSCH. The combination of the start symbol S and the time length L of the PDSCH may be referred to as a Start and Length Indicator (SLIV).

[0016] The UE may determine the time domain resource on which the PDSCH is scheduled based on the value of a predetermined field included in the DCI and at least one of slot offset K0 information, mapping type, start symbol S, symbol length L, and SLIV specified in the table (see FIG. 1). Note that the reference points of the start symbol S and symbol length L may be controlled based on the start position (first symbol) of the slot. Also, the start symbol S, symbol length L, etc. may be defined according to the mapping type of the PDSCH.

[0017] As shown in Figure 1, the UE determines the slot in which the PDSCH is scheduled, using the DCI (or the PDCCH used to transmit the DCI) as a reference point in the time domain. For example, when the UE receives DCI scheduling the PDSCH in slot #n, it determines the slot number n and the subcarrier spacing μ for the PDSCH. PDSCH , subcarrier spacing for PDCCH μ PDCCH The slot for receiving the PDSCH (allocated to the PDSCH) may be determined based on at least one of the time offsets K0. Here, the case is shown where the slot offset K0=1 and the subcarrier intervals of the PDSCH and PDCCH are the same.

[0018] Furthermore, the UE determines the allocation of the PDSCH based on the resource allocation information (e.g., SLIV) specified in the TDRA field, using the starting point of the slot to which the PDSCH is allocated as a reference point. Note that the reference point may also be called a reference point or a reference point.

[0019] [PUSCH] The UE may determine a row index (entry number or entry index) in a predetermined table based on the value of the TDRA field in the DCI (e.g., DCI format 0_0 / 0_1 / 0_2). The predetermined table may include at least one of information indicating a time offset (e.g., slot offset K2) between the DCI and the PUSCH scheduled by the DCI, information indicating a mapping type of the PUSCH, and a start symbol S and a duration L of the PUSCH. The combination of the start symbol S and duration L of the PUSCH may be referred to as a Start and Length Indicator (SLIV).

[0020] The UE may determine the time domain resource on which the PUSCH is scheduled based on the value of a predetermined field included in the DCI and at least one of slot offset K2 information, mapping type, start symbol S, symbol length L, and SLIV specified in the table (see FIG. 1). Note that the reference points of the start symbol S and symbol length L may be controlled based on the start position (first symbol) of the slot. Also, the start symbol S, symbol length L, etc. may be defined according to the mapping type of the PDSCH.

[0021] As shown in Figure 1, the UE determines the slot in which the PUSCH is scheduled, using the DCI (or the PDCCH used to transmit the DCI) as a reference point in the time domain. For example, when the UE receives DCI scheduling the PUSCH in slot #n+4, it determines the slot number n+4 and the subcarrier spacing μ for the PUSCH. PDSCH , subcarrier spacing for PUCCH μ PDCCH The slot for transmitting the PUSCH (allocated to the PUSCH) may be determined based on at least one of the time offsets K2. Here, the case is shown where the slot offset K2=3 and the subcarrier intervals of the PDSCH and PDCCH are the same.

[0022] Furthermore, the UE determines the allocation of the PUSCH based on the resource allocation information (for example, SLIV) specified in the TDRA field, using the start point of the slot to which the PUSCH is allocated as a reference.

[0023] (Multi-TRP) In NR, one or more Transmission / Reception Points (TRPs) (multi-TRP) are considered to perform DL transmission to a UE using one or more panels (multi-panel), and a UE is considered to perform UL transmission to one or more TRPs.

[0024] Note that multiple TRPs may correspond to the same cell identifier (ID), or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0025] 2A-2D illustrate an example of a multi-TRP scenario, assuming, but not limited to, that each TRP is capable of transmitting four different beams.

[0026] 2A shows an example of a case where only one TRP (TRP1 in this example) of multiple TRPs transmits to the UE (this may be referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both control signals (PDCCH) and data signals (PDSCH) to the UE.

[0027] 2B shows an example of a case where only one TRP (TRP1 in this example) transmits a control signal to a UE, and the TRP transmits a data signal (this case may be called a single master mode). The UE receives each PDSCH transmitted from the TRP based on one Downlink Control Information (DCI).

[0028] 2C shows an example of a case where each of the multiple TRPs transmits a part of the control signal to the UE and the multiple TRPs transmit data signals (this may be called a master-slave mode). Part 1 of the control signal (DCI) may be transmitted in TRP1, and Part 2 of the control signal (DCI) may be transmitted in TRP2. Part 2 of the control signal may depend on Part 1. The UE receives each PDSCH transmitted from the multiple TRPs based on these parts of DCI.

[0029] 2D shows an example of a case where each of the multiple TRPs transmits a separate control signal to the UE, and the multiple TRPs transmit data signals (this may be referred to as a multi-master mode). A first control signal (DCI) may be transmitted from TRP1, and a second control signal (DCI) may be transmitted from TRP2. The UE receives each PDSCH transmitted from the multiple TRPs based on these DCIs.

[0030] When multiple PDSCHs (which may be referred to as multiple PDSCHs) from multiple TRPs as in Figure 2B are scheduled using one DCI, the DCI may be referred to as a single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from multiple TRPs as in Figure 2D are scheduled using multiple DCIs, these multiple DCIs may be referred to as multiple DCIs (M-DCI, multiple PDCCHs).

[0031] Each TRP of a multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) is being considered as one form of multi-TRP transmission.

[0032] In the NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP2 performs modulation mapping and layer mapping on a second codeword to transmit a second number of layers (e.g., two layers) with a second precoding.

[0033] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in at least one of the time and frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0034] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (Quasi-Co-Location (QCL)). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0035] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. Repetition schemes (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0036] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0037] An NCJT using multiple TRPs / panels may use a high rank. To support ideal and non-ideal backhaul between multiple TRPs, both single DCI (single PDCCH, e.g., FIG. 2B) and multiple DCI (multiple PDCCH, e.g., FIG. 2D) may be supported. For both single DCI and multi-DCI, the maximum number of TRPs may be two.

[0038] For single PDCCH design (mainly for ideal backhaul), TCI extensions are being considered. Each TCI codepoint in the DCI may correspond to a TCI state of 1 or 2. The TCI field size may be the same as that in Rel. 15.

[0039] Incidentally, in Rel. 17 and later, it is assumed that repeated transmission (PDCCH repetition) is applied to PDCCHs (or DCIs) transmitted from one or more TRPs. For example, it is conceivable that multiple PDCCHs (or DCIs) transmitted from one or more TRPs are used to schedule or instruct transmission / reception of one or more signals / channels.

[0040] A PDCCH / DCI to which repeated transmission is applied may be called a multi-PDCCH / multi-DCI. Repeated transmission of a PDCCH may be read as PDCCH repetition, multiple transmission of a PDCCH, multi-PDCCH transmission, or multiple PDCCH transmission.

[0041] Multi-PDCCHs / multi-DCIs may be transmitted from one TRP. Alternatively, multi-PDCCHs / multi-DCIs may be transmitted from different TRPs. The multi-PDCCHs / DCIs may be multiplexed using time multiplexing (TDM), frequency multiplexing (FDM), or spatial multiplexing (SDM). For example, when PDCCH repetition (TDM PDCCH repetition) is performed using time multiplexing, PDCCHs transmitted from different TRPs are assigned to different time domains.

[0042] Assume that one or more physical shared channels (e.g., DL-SCH / transport block) are scheduled using the multi-PDCCH / DCI. The one or more physical shared channels may be, for example, the same / single physical shared channel (e.g., DL-SCH / transport block), or multiple physical shared channels scheduled in the same time domain. In such a case, how to control scheduling (e.g., the content to be notified by each DCI, the reference point at the time of scheduling, etc.) becomes an issue.

[0043] For example, when the contents of DCI transmitted on PDCCHs in different time domains (e.g., DCI payload / coded bits / number of CCEs) are the same, the UE faces a problem of how to apply / interpret each PDCCH / DCI to control transmission or reception processing. As an example, the UE faces a problem of how to apply / interpret the time relationship indication (e.g., the same value) of each PDCCH / DCI to control scheduling.

[0044] FIG. 3 shows an example of a case where one PDSCH (for example, the same PDSCH) is scheduled by a PDCCH to which repeated transmission is applied.

[0045] In this case, scheduling of the physical shared channel may be controlled based on timing-related information (e.g., time-domain resource allocation information) included in each PDCCH / DCI transmitted in different time domains (e.g., different slots / symbols). The PDCCHs transmitted in different time domains may be configured to schedule the same transport block (or physical shared channels transmitting the same transport block).

[0046] However, when scheduling using multiple PDCCHs / DCIs, a problem arises as to how to control the setting of timing-related information (e.g., time domain resource allocation information) included in each PDCCH / DCI or how to control its interpretation in the UE.

[0047] For example, if timing-related information (e.g., the same value / same payload) included in each PDCCH / DCI is applied / interpreted based on each PDCCH / DCI, the UE may not be able to properly grasp one PDSCH (e.g., transmission / reception timing) scheduled for PDCCH repetition (see Figure 3).

[0048] The present inventors came up with the idea for this embodiment by considering how to determine a reference PDCCH / DCI / control resource set or how to perform control based on the reference PDCCH / DCI / control resource set in one or more cases in which transmission processing / reception processing is performed using PDCCH repetition (e.g., multiple PDCCHs / DCIs).

[0049] Alternatively, it is also assumed that repeated transmission is applied to a downlink control channel (or CORESET / downlink control channel candidate / search space / search space set) used for transmitting DCI common to UEs (or DCI transmitted using a common search space). The UE monitors a PDCCH candidate set in CORESET, but when repeated transmission is applied to a downlink control channel (or CORESET / downlink control channel candidate / search space / search space set), how to control the monitoring of PDCCH candidates in CORESET / common search space becomes an issue.

[0050] The present inventors focused on a case where repeated transmission is supported for a PDCCH corresponding to a DCI common to UEs (e.g., at least one of DCI formats 2_0 to 2_6) / common search space set (e.g., type 0 / 0A / 1 / 2 / 3-PDCCH CSS set), and came up with the present embodiment by studying reception control of the PDCCH in such a case.

[0051] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that each of the following aspects (for example, each case) may be used alone, or at least two of them may be combined and applied.

[0052] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0053] In the present disclosure, terms such as activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0054] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), configurations, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0055] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0056] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0057] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0058] In this disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In this disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0059] In this disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0060] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interchangeable. "Spatial relationship information" may be interchangeable with "set of spatial relationship information," "one or more pieces of spatial relationship information," etc. The TCI state and TCI may be interchangeable with each other.

[0061] In the present disclosure, the PDSCH (or DL-SCH / CW / TB) / PUSCH (or UL-SCH) scheduled / transmitted on the PDCCH to which repeated transmission is applied may have the same content or different content.

[0062] The DCI in the following embodiments may be limited to a specific DCI format among DCI formats for scheduling a PUSCH (for example, DCI formats 0_0, 0_1, and 0_2), or may correspond to multiple DCI formats. Note that when multiple DCI formats are applicable, common control (the same control and the same processing) may be performed for all DCI formats, or different control may be performed for each DCI format.

[0063] In the following embodiments, "plurality" and "two" may be read interchangeably.

[0064] (Wireless communication method) In the present disclosure, a plurality of PDCCHs / DCIs (e.g., multi-PDCCHs / multi-DCIs) to which repeated transmission is applied may be associated with each other through a predetermined transmission parameter (or one or more predetermined transmission parameters). The predetermined transmission parameter may be at least one of a control channel element (CCE), a PDCCH candidate, a resource element group (REG), a search space, a search space set, and a CORESET.

[0065] For example, predetermined transmission parameters may be set in association between a PDCCH serving as a time reference (e.g., a PDCCH transmitted first in repeated transmission) and other PDCCHs. As an example, predetermined transmission parameters may be set based on the repetition order (or in association with the transmission order) among transmission parameters of multiple PDCCHs to which repetition is applied. The UE can determine the transmission order of each PDCCH (e.g., the PDCCH to be transmitted first) based on information related to PDCCH repetition (e.g., the number of repetitions, the repetition period, etc.) and the transmission parameters corresponding to each PDCCH.

[0066] In the present disclosure, a PDCCH to which repeated transmission is applied may be interpreted as a CORESET / PDCCH candidate / search space / search space set to which repeated transmission is applied. In other words, applying repeated transmission to a PDCCH may be interpreted as applying repeated transmission to a CORESET / PDCCH candidate / search space / search space set. Also, in the present disclosure, the PDCCH, CORESET, PDCCH candidate, search space, and search space set may be interpreted as interchangeable.

[0067] When repeated transmission is applied to the PDCCH, CORESETs / PDCCH candidates / search space sets corresponding to different repeated transmissions may be configured in an associated or linked manner. Multiple (e.g., two) linked PDCCH candidates or multiple (e.g., two) linked search space sets may correspond to one CORESET or different CORESETs.

[0068] Furthermore, when repeated transmission is performed using PDCCHs transmitted from multiple TRPs (e.g., two TRPs), the CORESETs / PDCCH candidates / search spaces / search space sets corresponding to each TRP may be associated and configured. Multiple (e.g., two) associated CORESETs / PDCCH candidates / search spaces / search space sets may be referred to as a linked CORESET / linked PDCCH candidate / linked search space / linked search space set.

[0069] In this embodiment, a case will be described in which DCI with the same payload content (same DCI payload content) is transmitted by PDCCH repetitions (TDM PDCCH repetitions) transmitted in different time domains. That is, this corresponds to a case in which the same DCI payload content is notified to each UE by multi-PDCCH. Note that this embodiment is not limited to this, and may be applied to a case in which transmission of DCI with different payload content (same DCI payload content) is supported / allowed by PDCCH repetitions transmitted in different time domains.

[0070] The payload contents being the same may mean that the values ​​of all fields included in each DCI are set to the same, or that the values ​​of some predetermined fields among the fields included in each DCI are set to the same.

[0071] The predetermined field may be a notification field for time-related information. The time-related information may be interpreted as timing-related information, a time-related indication, or a timing-related indication (e.g., timing related indication). For example, the predetermined field may be at least one of a time domain resource assignment field and a PDSCH-to-HARQ feedback timing indicator field.

[0072] When a given physical shared channel is scheduled by multiple DCIs, each transmitted on a PDCCH allocated to a different time domain, and the contents (e.g., payload contents) of the multiple DCIs are the same, the UE may interpret / apply the time-related information (or timing-related information) included in the DCI based on a specific time reference.

[0073] The time reference may be interpreted as a timing reference, a reference timing, a reference point, a time reference point, a reference in the time domain, or a reference point in the time domain. The time reference may also be interpreted as a reference of a parameter other than time.

[0074] The specific time reference may be a specific PDCCH (or the transmission timing of a specific PDCCH) among multiple PDCCHs that are repeatedly transmitted. For example, in one or more cases where transmission processing / reception processing is performed using PDCCH repetition (e.g., multiple PDCCHs / DCIs), the UE may apply at least one of the following criteria A1 to A8 as the specific time reference for detecting / receiving a PDCCH corresponding to a DCI or for scheduling a DL channel / UL channel / RS. In other words, the UE may determine which PDCCH / DCI to refer to (which DCI value to be instructed) among the PDCCHs / DCIs that are repeatedly received multiple times, based on at least one of the following criteria A1 to A8.

[0075] Criterion A1: First / last PDCCH repetition in time domain Criterion A2: First / last PDCCH repetition in frequency domain Criterion A3: PDCCH repetition with lowest / highest TCI state ID Criterion A4: PDCCH repetition with lowest / highest CORESET Pool ID (TRP ID) Criterion A5: PDCCH repetition with lowest / highest CORESET ID Criterion A6: PDCCH repetition with lowest / highest search space index Criterion A7: PDCCH repetition with lowest / highest minoring occasion Criterion A8: Any combination of A1-A7

[0076] The first / last PDCCH repetition in the time domain may be any of the PDCCHs to which repeated transmission is applied, that is, the PDCCH that ends last (end later), the PDCCH that ends first (end earlier), the PDCCH that starts last (start later), or the PDCCH that starts first (start earlier).

[0077] Criterion A1 corresponds to, for example, a case where the first transmitted (or received) PDCCH among PDCCH repetitions or the first allocated PDCCH in the time domain is the specific time reference. The UE may use the first symbol of the first transmitted PDCCH as the specific time reference, or the last symbol of the PDCCH as the specific time reference. Alternatively, the last transmitted (or received) PDCCH among PDCCH repetitions or the last allocated PDCCH in the time domain may be the specific time reference.

[0078] In criterion A2, for example, a PDCCH having the smallest control channel element (CCE) index / largest CCE index among PDCCH repetitions may be the specific time reference, or a PDCCH having the smallest PDCCH candidate index / largest PDCCH candidate index among PDCCH repetitions may be the specific time reference.

[0079] In criterion A8, for example, A1 and A4 may be combined so that the PDCCH that is transmitted first in the time domain among the PDCCHs having the smallest CORESET pool ID may be the specific time criterion.

[0080] Note that the specific time reference may be determined based on a control resource set corresponding to the PDCCH, rather than the PDCCH / DCI. For example, in one or more cases where transmission processing / reception processing is performed using PDCCH repetition in multiple control resource sets, the UE may apply at least one of the following criteria B1 to B8 as a control resource set that serves as a reference for detecting / receiving the PDCCH corresponding to the DCI or for scheduling the DL channel / UL channel / RS. In other words, the UE may determine which control resource set to refer to (which control resource set's DCI value is to be instructed) among the PDCCH / DCI repeatedly received multiple times (e.g., in the case of control resource set repetition), based on at least one of the following criteria B1 to B8.

[0081] Criterion B1: Control resource set of first / last PDCCH repetition in time domain (CORESET of first / last PDCCH repetition in time domain) Criterion B2: CORESET of first / last PDCCH repetition in frequency domain Criterion B3: Control resource set with minimum / maximum resource block (or resource block group) (CORESET with lowest / highest RB / RBG) Criterion B4: CORESET with lowest / highest TCI state ID Criterion B5: Control resource set with lowest / highest CORESET Pool ID (or TRP ID) Criterion B6: Control resource set with lowest / highest CORESET ID Criterion B7: CORESET associated with lowest / highest search space index Criterion B8: Any combination of B1-B7

[0082] The CORESET of the first PDCCH repetition / last PDCCH repetition in the time domain may be any one of the CORESET corresponding to the PDCCH that ends last (end later), the CORESET corresponding to the PDCCH that ends first (end earlier), the CORESET corresponding to the PDCCH that starts last (start later), and the CORESET corresponding to the PDCCH that starts first (start earlier) among the CORESETs corresponding to the PDCCHs to which repeat transmission is applied. Alternatively, the CORESET of the first PDCCH repetition / last PDCCH repetition in the time domain may be any one of the CORESET corresponding to the PDCCHs to which repeat transmission is applied, the CORESET corresponding to the PDCCH that ends last (end later), the CORESET that ends first (end earlier), the CORESET that starts last (start later), and the CORESET that starts first (start earlier).

[0083] Criterion B8 may be, for example, a combination of B5 and B6, such that the control resource set having the smallest control resource set ID among the PDCCHs having the smallest CORESET pool IDs is the criterion (for example, a specific time criterion).

[0084] <Applicable cases> This embodiment may be applied to at least one of the following cases 0 to 13 as one or more cases in which transmission processing / reception processing is performed using PDCCH repetition (for example, multiple PDCCHs / DCIs).

[0085] <Case 0> Criteria A1-A8 (hereinafter simply referred to as Criterion A) / Criteria B1-B8 (hereinafter simply referred to as Criterion B) may be applied to control the transmission timing (e.g., time domain resources) of a physical shared channel (e.g., PDSCH / PUSCH) scheduled using PDCCH / DCI repetition.

[0086] For example, the UE may determine the time domain resources of the signal / channel (e.g., physical shared channel) scheduled in each DCI based on a specific time reference and a notification field of time-related information included in each DCI (or at least one DCI).

[0087] For example, if the slot offset K0 / K2 specified in each DCI is the same value (e.g., K0=2), the UE may determine that the PDSCH / PUSCH is scheduled in a slot that is K0 / K2 away from a specific time reference.

[0088] [Group Common DCI] Criterion A / Criterion B may be applied to the control of transmission processing / reception processing based on a group-common DCI (e.g., group common DCI). The group-common DCI may be, for example, DCI format 2_0 (case 1), DCI format 2_1 (case 2), DCI format 2_4 (case 3), or DCI format 2_5 in Rel. 16 or later. Of course, applicable group-common DCI formats are not limited to these.

[0089] Case 1 DCI format 2_0 is used to notify the slot format. For example, the UE determines the slot format (e.g., the transmission direction of each symbol (e.g., UL / DL / flexible)) for a predetermined number of slots in the DL BWP / UL BWP based on the value of a field (e.g., the SFI index field) of DCI format 2_0.

[0090] In this way, when a plurality of DCI formats 2_0 are transmitted using PDCCH repetition, the problem arises as to at what position (for example, in which slot) the slot format information notified in DCI format 2_0 should start.

[0091] Therefore, in this embodiment, when multiple DCI formats 2_0 are transmitted using PDCCH repetition (or PDCCHs that are repeatedly transmitted), the UE may control transmission processing / reception processing based on criterion A / criterion B.

[0092] For example, the UE may apply / interpret slot format information notified in DCI format 2_0 based on a specific time reference (e.g., Reference A / Reference B) to control transmission processing / reception processing (see FIG. 4). FIG. 4 shows a case where, in PDCCH repetition (here, PDCCH #1 (DCI #1) and PDCCH #2 (DCI #2)), PDCCH #1 (DCI #1) is set as the specific reference (e.g., the first repeated PDCCH in Reference A1).

[0093] This allows the UE to appropriately determine the slot format even when multiple DCI formats 2_0 are repeatedly transmitted.

[0094] <Case 2> DCI format 2_1 is used to notify resource blocks (e.g., PRBs) and symbols for which the UE may assume no transmission is intended. For example, the UE may determine resource blocks (e.g., PRBs) and symbols for which no transmission is intended based on information (e.g., preemption indication) included in DCI format 2_1. For example, when the UE detects DCI format 2_1, it may assume that there is no transmission to the UE in the set of symbols notified in DCI format 2_1 from the set of PRBs and symbols in the last monitoring period.

[0095] If the UE detects DCI format 2_1 on the PDCCH transmitted on a control resource set in a slot, the set of symbols is the last N symbols before the first symbol of the control resource set in the slot. symb slot T INT 2 μ-μINT It becomes a symbol of the individual. INT is the PDCCH monitoring period provided by higher layer signaling, N symb slot is the number of symbols per slot, μ is the differential subcarrier spacing configuration (SCS configuration) of the serving cell mapped to each field of DCI format 2_1, μ INT corresponds to the subcarrier spacing configuration of the DL BWP in which the UE receives the PDCCH in DCI format 2_1.

[0096] In this way, when multiple DCI formats 2_1 are transmitted using PDCCH repetition, the question arises as to which control resource set the information notified in DCI format 2_1 should be applied / interpreted based on.

[0097] Therefore, in this embodiment, when multiple DCI formats 2_1 are transmitted using PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control transmission processing / reception processing based on criterion A / criterion B.

[0098] For example, the UE controls transmission processing / reception processing by applying / interpreting information notified in DCI format 2_1 based on a specific control resource set (e.g., criterion B). This allows the UE to appropriately control communication even when multiple DCI formats 2_1 are repeatedly transmitted.

[0099] Case 3 DCI format 2_4 is used to notify the PRBs and symbols for which the corresponding UL transmission is to be canceled. For example, the UE may determine the PRBs and symbols for which the UL transmission is to be canceled based on information (e.g., cancellation indication) included in DCI format 2_4.

[0100] The instruction in DCI format 2_4 may be applied to PUSCH transmission / SRS transmission. When PUSCH transmission / SRS transmission is scheduled in a DCI format, the instruction in DCI format 2_4 is applied to PUSCH transmission or SRS transmission only if the last symbol of PDCCH reception corresponding to the DCI format is earlier than the first symbol of PDCCH reception corresponding to DCI format 2_4.

[0101] In addition, the UE may apply / interpret the information notified in DCI format 2_4 based on the last timing of PDCCH reception at which DCI format 2_4 was detected / the last symbol of the control resource set at which DCI format 2_4 was detected, and control PUSCH transmission / SRS transmission.

[0102] Furthermore, the UE is not expected to cancel PUSCH transmission or SRS transmission before a predetermined symbol after the last symbol of the control resource set in which DCI format 2_4 is detected.

[0103] In this way, when multiple DCI formats 2_4 are transmitted using PDCCH repetition, the question arises as to which PDCCH repetition / control resource set the information reported in DCI format 2_4 should be applied / interpreted based on.

[0104] Therefore, in this embodiment, when multiple DCI formats 2_4 are transmitted using PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control transmission processing / reception processing based on criterion A / criterion B.

[0105] For example, the UE controls transmission processing / reception processing by applying / interpreting information notified in DCI format 2_4 based on a specific time reference (e.g., reference A / reference B). This allows the UE to appropriately control communication even when multiple DCI formats 2_4 are repeatedly transmitted.

[0106] Separate time references may be applied to PDCCH reception corresponding to a DCI format that schedules PUSCH transmission / SRS transmission and PDCCH reception corresponding to DCI formats 2-4.

[0107] Case 4 DCI format 2_5 is used to notify the availability of soft resources. For example, the UE may determine the soft resources that are available based on the value of information included in DCI format 2_5 (e.g., the Availability Indicator (AI)).

[0108] The use of IAB (Integrated Access Backhaul) technology, which uses NR communications as a backhaul between base stations (or between base stations and relay stations), is being considered. In particular, IAB using NR communications using millimeter waves is expected to enable low-cost expansion of coverage areas.

[0109] An IAB node may have at least one function such as a DU (Distribution Unit), a CU (Central Unit), or an MT (Mobile Termination). Thus, an IAB node may function as a base station or as a user equipment (UE).

[0110] The value of the DCI format 2_5 availability indication (e.g., AI index) field indicates to the IAB-DU the availability of soft symbols in each slot of the IAB-DT starting from the earliest slot that overlaps in time with the slot of the IAB node where the IAB-DU detected DCI format 2_5. The number of slots is equal to or greater than the PDCCH monitoring period of DCI format 2_5 provided in the higher layer parameters for the search space.

[0111] In this way, when a plurality of DCI formats 2_5 are transmitted using PDCCH repetition, the position of the slot in which DCI format 2_5 is detected becomes an issue.

[0112] Therefore, in this embodiment, when multiple DCI formats 2_5 are transmitted using PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control transmission processing / reception processing based on criterion A / criterion B.

[0113] For example, the UE controls transmission processing / reception processing by applying / interpreting information notified in DCI format 2_5 based on a specific time reference (e.g., reference A / reference B). This allows the UE to appropriately control communication even when multiple DCI formats 2_5 are repeatedly transmitted.

[0114] [PDSCH / PUSCH scheduling] Criterion A / Criterion B may be applied to the control of transmission processing / reception processing based on DCI / PDCCH used for scheduling operations of PDSCH / PUSCH. Scheduling operations of PDSCH / PUSCH may include allocation of resources (e.g., frequency resources) (Case 5), scheduling restrictions on PDSCH (Case 6), and in / out-of-order for PDSCH / PUSCH (Case 7).

[0115] Case 5 The resource (e.g., RB) allocation for the PDSCH is determined based on the control resource set in which the UE receives DCI. For example, if the PDSCH is scheduled with DCI format 1_0 in a certain type of PDCCH common search space, the resource block numbering (RB numbering) starts from the smallest RB in the control resource set in which the DCI is received, regardless of which bandwidth portion is the active BWP. Otherwise, the RB numbering starts from the smallest RB in the determined DL BWP (predetermined BWP).

[0116] In this way, when multiple DCI formats containing frequency-domain resource allocation information are transmitted using PDCCH repetition, the question arises as to which DCI (or control resource set) to base resource allocation on, for example, which DCI / control resource set's RBs to start RB numbering based on.

[0117] Therefore, in this embodiment, when multiple DCI formats including frequency domain resource allocation information are transmitted using PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control transmission processing / reception processing (e.g., determine allocated resources) based on criterion A / criterion B.

[0118] For example, the UE may determine frequency domain resource allocation based on a PDCCH / DCI / control resource set determined based on a specific time reference (e.g., Reference A / Reference B). This allows the UE to appropriately determine frequency domain resources for the PDSCH even when multiple DCI formats including information related to frequency domain resources for the PDSCH are repeatedly transmitted.

[0119] The PUSCH resource (e.g., RB) allocation is determined based on the CCE index of the PDCCH in the DCI detected by the UE. For example, for DCI format 0_0 monitored in a common search space CRC-scrambled with an RNTI other than a predetermined RNTI (e.g., TC-RNTI), the uplink RB set may be the RB set with the smallest index among the uplink RB sets that intersect with the CCE with the smallest index of the PDCCH in which the UE detected DCI format 0_0 in the active DL BWP. If there is no intersection, the uplink RB set may be RB set 0 in the active UL BWP.

[0120] When multiple DCI formats containing frequency-domain resource allocation information are transmitted using PDCCH repetition, the question arises as to which PDCCH corresponds to which DCI to control resource allocation, for example, how to determine the RB set based on the minimum CCE of the PDCCH corresponding to which DCI.

[0121] Therefore, in this embodiment, when multiple DCI formats including frequency domain resource allocation information are transmitted using PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control transmission processing / reception processing (e.g., determine allocated resources) based on criterion A / criterion B.

[0122] For example, the UE may determine frequency domain resource allocation (e.g., RB set) based on the PDCCH / DCI determined based on a specific time reference (e.g., Reference A / Reference B). This allows the UE to appropriately determine frequency domain resources for the PUSCH even when multiple DCI formats including information related to frequency domain resources for the PDSCH are repeatedly transmitted.

[0123] Case 6 Reception of a PDSCH with a certain mapping type may be restricted depending on the reception timing of the PDCCH that schedules the PDSCH (e.g., in relation to the time allocation of the PDSCH). For example, the UE does not expect to receive a PDSCH with mapping type B in a slot if the first symbol of the PDCCH that schedules the PDSCH is received at a symbol later than the first symbol indicated in the time domain resource allocation of the PDSCH.

[0124] In this way, when scheduling PDSCH using PDCCH repetition, the question arises as to which PDCCH symbol to use for controlling resource limitation, for example, which PDCCH first symbol to compare with the first symbol of the PDSCH time domain resource.

[0125] Therefore, in this embodiment, when multiple DCI formats for scheduling PDSCH are transmitted using PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control transmission processing / reception processing based on criterion A / criterion B.

[0126] For example, the UE may control whether to receive a PDSCH having a predetermined mapping type (e.g., mapping type B) based on a PDCCH symbol (first symbol) determined based on a specific time reference (e.g., reference A / reference B). This allows the UE to appropriately determine whether to receive a PDSCH even when multiple DCI formats used for scheduling the PDSCH are repeatedly transmitted.

[0127] Case 7 PDSCH reception processing based on DCI and PUSCH transmission processing based on DCI are executed in-order / out-of-order. In-order corresponds to a case where PDSCH / PUSCH transmission and reception processing is performed in the order in which DCI is received, and out-of-order corresponds to a case where PDSCH / PUSCH transmission and reception processing is performed out of the order in which DCI is received. An example of PDSCH reception processing / PUSCH transmission processing based on DCI will be described below.

[0128] For example, for two HARQ process IDs in a given scheduled cell, a UE may be scheduled to start receiving a first PDSCH starting at symbol j with a PDCCH ending at symbol i, and the UE may not expect a PDCCH ending after symbol i to be scheduled to receive a PDSCH starting earlier than the end of the first PDSCH.

[0129] The UE may also be controlled to decode a PDSCH scheduled by a PDCCH, except in a predetermined condition, if the PDCCH that schedules the PDSCH ends at least 14 symbols before the earliest start symbol of a PDSCH that does not have a corresponding PDCCH transmission.

[0130] Also, for two HARQ process IDs in a scheduled cell, it is assumed that a UE is scheduled to start receiving a first PDSCH starting at symbol j via a PDCCH associated with a value of CORESET pool index ending at symbol i, and the UE may then be scheduled to receive a PDSCH starting earlier than the end of the first PDSCH via a PDCCH associated with a different value of CORESET pool index ending after symbol i.

[0131] Also, for two HARQ process IDs in a scheduled cell, a UE may be scheduled to start transmitting a first PUSCH starting at symbol j with a PDCCH ending at symbol i. In this case, the UE may not assume that a PDCCH ending after symbol i will schedule transmission of a PUSCH starting earlier than the end of the first PUSCH.

[0132] Also, for two HARQ process IDs in a scheduled cell, it is assumed that a UE is scheduled to start transmitting a first PUSCH starting at symbol j via a PDCCH associated with a value of CORESET pool index that ends at symbol i, and in this case, the UE may be scheduled to transmit a PUSCH that starts earlier than the end of the first PDSCH via a PDCCH associated with a different value of CORESET pool index that ends after symbol i.

[0133] The UE may also assume that a PUSCH transmission is not scheduled in a serving cell that overlaps in time with a given transmission occasion due to a PDCCH ending at symbol i if the end of symbol i is not at least N2 symbols before the start of symbol j, which may start at symbol j of the same serving cell. N2 may be a value determined based on UE capabilities.

[0134] Also, in a predetermined condition, the UE may assume that it will terminate the repetition of a transport block in a PUSCH transmission starting from symbol j if the gap between the end of the PDCCH at symbol i and the start of the PUSCH transmission at symbol j is equal to or greater than N symbols. The predetermined condition may be when the UE receives an ACK for a given HARQ process in CG-DFI in the PDCCH ending at symbol i to terminate the repetition in the configuration grant-based PUSCH transmission on a given serving cell with the same HARQ process after symbol i.

[0135] Also, under a predetermined condition, the UE may not assume that it is scheduled to transmit a PUSCH in a serving cell corresponding to a certain HARQ process by a PDCCH ending at symbol i. The predetermined condition may be when there is a transmission opportunity for a configuration grant-based PUSCH with the same HARQ process on the same serving cell that starts at symbol j after symbol i, and the gap between the ending symbol of the PDCCH and the beginning of symbol j is less than N symbols.

[0136] As described above, in PDSCH reception processing / PUSCH transmission processing based on DCI, the UE controls using the PDCCH / DCI as a reference (for example, a time reference). When performing PDSCH reception processing / PUSCH reception processing using PDCCH repetition, the question arises as to which PDCCH / DCI to base the control on.

[0137] Therefore, in the present embodiment, when PDSCH reception / PUSCH transmission is controlled based on in-order / out-of-order using PDCCH repetition (or repeatedly transmitted PDCCH), the UE may control transmission processing / reception processing based on criterion A / criterion B. This allows the UE to appropriately control PDSCH reception processing / PUSCH transmission processing even when multiple PDCCHs / DCIs are repeatedly transmitted.

[0138] Case 8 The resource of the uplink control channel (e.g., PUCCH) is determined based on the CCE index corresponding to the PDCCH. For example, when the UE transmits HARQ-ACK using the PUCCH in response to detecting the DCI format for scheduling PDSCH reception / SPS PDSCH release, the UE determines the resource of the uplink control channel (e.g., PUCCH) based on the CCE index corresponding to the PDCCH. PUCCH ) is determined. PUCCH ≦15) may be expressed by the following formula (1):

[0139]

number

[0140] Also, for the first set of PUCCH resources, if the size of the resource list is greater than a predetermined value (e.g., 8), the UE may use a predetermined index (r PUCCH ) is determined. PUCCH ≦R PUCCH −1) may be expressed by the following equation (2): The transmission of HARQ-ACK may correspond to the PUCCH transmission transmitted in the same slot.

[0141]

number

[0142] In this way, when PDCCH repetition is used to transmit multiple PDCCH / DCI / control resource sets including PUCCH resource information (e.g., CCE index information), the question arises as to which PDCCH / DCI / control resource set to base the PUCCH resource on.

[0143] Therefore, in the present embodiment, when determining a PUCCH resource (for example, a PUCCH for transmitting HARQ-ACK corresponding to a PDSCH) corresponding to a PDSCH scheduled using PDCCH repetition (or a PDCCH that is repeatedly transmitted), the UE may control transmission processing / reception processing (for example, determine a PUCCH resource) based on criterion A / criterion B. A PUCCH corresponding to a PDSCH scheduled using PDCCH repetition may be interpreted as a PUCCH triggered using PDCCH repetition.

[0144] For example, the UE may determine the PUCCH resource based on a PDCCH / DCI / control resource set determined based on a specific time reference (e.g., Reference A / Reference B). As an example, the UE may determine the PUCCH resource using the CCE corresponding to the PDCCH / control resource set determined based on the specific time reference. This allows the UE to appropriately determine the PUCCH resource even when the PDCCH / DCI / control resource set is repeatedly transmitted.

[0145] Case 9 The sounding reference signal (SRS) resource is determined based on a sounding reference indicator (SRI) or a PDCCH that carries the SRI. For example, the SRI indicated in slot n may be associated with the most recent transmission of the SRS resource identified by the SRI. The SRS resource is configured / arranged before the PDCCH that carries the SRI.

[0146] In this way, when multiple PDCCHs / DCIs containing information on SRIs are transmitted using PDCCH repetition, the question arises as to which PDCCH / DCI to base SRS resource decisions on.

[0147] Therefore, in this embodiment, when SRS transmission is controlled based on PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control the SRS transmission processing (e.g., determining the SRS resource) / reception processing (e.g., receiving DCI including SRI) based on criterion A / criterion B.

[0148] For example, the UE may determine the SRS resource based on the PDCCH / DCI determined based on a specific time reference (e.g., Reference A / Reference B). This allows the UE to appropriately determine the SRS resource even when the PDCCH / DCI / control resource set is repeatedly transmitted.

[0149] Case 10 In discontinuous reception (DRX) control, a predetermined timer (e.g., DRX timer) is controlled based on whether a new PDCCH transmission is notified. For example, when a PDCCH notifies a new transmission (DL or UL) on a serving cell of a predetermined DRX group, the UE starts / restarts a timer (e.g., drx-InactivityTimer) for the DRX group at the first symbol after the end of PDCCH reception.

[0150] In this way, when a predetermined timer in DRX control is controlled based on a PDCCH transmitted by PDCCH repetition, the question arises as to which PDCCH / DCI the predetermined timer should be controlled (for example, started / restarted) based on.

[0151] Therefore, in this embodiment, when controlling DRX based on PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may control DRX (e.g., start / restart the timer) based on Criterion A / Criteria B.

[0152] For example, the UE may control the timer (e.g., drx-InactivityTimer) of the DRX group to start / restart at the first symbol after the end of PDCCH reception, which is determined based on a specific time criterion (e.g., criterion A / criterion B).

[0153] Case 11 The bandwidth portion (BWP) change / switching / switching is controlled based on the timing of PDCCH / DCI reception. For example, if a UE detects a DCI format indicating a change in the active DL BWP of a cell (DL BWP change), the UE may not be required to receive or transmit in the cell from the end of the third symbol of the slot in which the UE receives the PDCCH containing the DCI format in the scheduling cell until the start of the slot indicated by the slot offset value in the time domain resource allocation field of the DCI format.

[0154] Furthermore, if a UE detects a DCI format indicating a change in the active UL BWP of a cell (UL BWP change), the UE may not be required to receive or transmit in the cell from the end of the third symbol of the slot in which the UE receives the PDCCH containing the DCI format in the scheduling cell until the start of the slot indicated by the slot offset value in the time domain resource allocation field of the DCI format.

[0155] In this way, when controlling the change / switching / replacement of the BWP based on the PDCCH transmitted by PDCCH repetition, the question arises as to which PDCCH / DCI the control should be based on.

[0156] Therefore, in this embodiment, when controlling the change / switching / reconfiguration of BWP based on PDCCH repetition (or PDCCH that is repeatedly transmitted), the UE may perform the control based on the PDCCH determined based on Criterion A / Criterion B.

[0157] For example, the UE may control the changing / switching / changing of the BWP based on a PDCCH determined based on a specific time reference (e.g., Reference A / Reference B).

[0158] <Case 12> The use of resources used for the PDSCH is restricted depending on whether they overlap with resources in a control resource set corresponding to the PDCCH / DCI that schedules the PDSCH. For example, if a PDSCH scheduled by a PDCCH overlaps with resources in a control resource set that includes the PDCCH, resources corresponding to the PDCCH that scheduled the PDSCH (e.g., the PDCCH detected by the UE) and the associated DMRS for PDCC cannot be used for the PDSCH.

[0159] In this way, in a case where there are multiple PDCCH candidates for a PDCCH repetition, if some PDCCH repetitions are not detected by the UE, the question arises as to whether all PDCCH candidates for the PDCCH repetition cannot be used for PDSCH, or whether only the detected PDCCHs cannot be used for PDSCH.

[0160] In this embodiment, when a PDSCH scheduled by a PDCCH overlaps with resources in a control resource set including a PDCCH repetition, the following option 12-1 or option 12-2 may be applied.

[0161] [Option 12-1] The UE may determine / assume that resources corresponding to the union of a PDCCH that scheduled a PDSCH (e.g., a PDCCH detected by the UE) and an associated DMRS for the PDCCH are not utilized for the PDSCH.

[0162] [Option 12-2] The UE may control resources corresponding to a union of a PDCCH that scheduled a PDSCH (e.g., a PDCCH detected by the UE) and an associated DMRS for the PDCCH not to be used for the PDSCH. Furthermore, the UE may determine / assume and control resources corresponding to a PDCCH candidate associated with a PDCCH detected as a PDCCH repetition and an associated DMRS for the PDCCH not to be used for the PDSCH.

[0163] The association between the PDCCH candidates / control resource sets / search space sets for PDCCH repetition may be defined in a specification, or may be configured in the UE by the base station through higher layer signaling or the like.

[0164] Case 13 A MAC entity (e.g., UE) monitors PDCCH occasions, e.g., for DRX control, but does not need (or is not required) to monitor the PDCCH if it is not a complete PDCCH occasion, e.g., if Active Time starts / stops in the middle of a PDCCH occasion.

[0165] Thus, in the case of PDCCH repetitions, if the active time starts / stops in the middle of two PDCCH repetitions, the question arises as to whether the MAC entity needs to monitor the PDCCH occasions (or how to control the monitoring).

[0166] In this embodiment, in a case where PDCCH repetition is applied in DRX control, if the PDCCH repetition is not a complete PDCCH repetition, at least one of the following options 13-1 to 13-4 may be applied. The case where the PDCCH repetition is not a complete PDCCH repetition may be, for example, a case where the active time starts / stops in the middle of a PDCCH repetition.

[0167] [Option 13-1] The MAC entity may be configured not to need to monitor all PDCCH repetitions (or not be required to monitor all PDCCH repetitions) (see Figure 5). Figure 5 shows the case where the active time starts / stops between the occasion of PDCCH repetition #1 and the occasion of PDCCH repetition #2. In this case, the MAC entity may be configured not to be required to monitor the PDCCH on the occasion of PDCCH repetition #1 and the occasion of PDCCH repetition #2.

[0168] [Option 13-2] The MAC entity may be configured to need (or be required to monitor) all PDCCH repetitions (see Figure 5), where the MAC entity may be configured to be required to monitor the PDCCH on the occasion of PDCCH repetition #1 and on the occasion of PDCCH repetition #2.

[0169] [Option 13-3] The MAC entity may be configured to need to monitor PDCCH repetitions after active time starts / stops (or only be required to monitor PDCCH repetitions after active time starts / stops) (see Figure 5). In Figure 5, the MAC entity may be configured such that on occasion of PDCCH repetition #1, monitoring of the PDCCH is not required, but on occasion of PDCCH repetition #2, monitoring of the PDCCH is required.

[0170] [Option 13-4] The MAC entity may be configured to need to monitor PDCCH repetitions before the active time starts / stops (or only be required to monitor PDCCH repetitions before the active time starts / stops), see Figure 5. In Figure 5, the MAC entity may be configured such that on occasion of PDCCH repetition #1, monitoring of the PDCCH is required, but on occasion of PDCCH repetition #2, monitoring of the PDCCH is not required.

[0171] [Variations] Separate options may be supported / allowed for the case where the active time starts in the middle of a PDCCH repetition and for the case where the active time stops in the middle of a PDCCH repetition, which allows for more flexible control of the monitoring of PDCCH repetitions.

[0172] The association between the PDCCH candidates / control resource sets / search space sets for PDCCH repetition may be defined in a specification, or may be configured in the UE by the base station through higher layer signaling or the like.

[0173] (UE capability information) The UE may report to the base station whether or not it supports PDCCH repetition as UE capability information. For example, the UE may report to the base station whether or not it supports an applicable multiplexing method (TDM / SDM / FDM) for PDCCH repetition.

[0174] The UE may report to the base station whether it supports inter-slot PDCCH repetition, intra-slot PDCCH repetition, or intra-mini-slot PDCCH repetition for PDCCH repetition transmitted in different time domains (TDM PDCCH repetition).

[0175] The UE may also report its capability regarding the number of repetitions (e.g., the maximum number) to the base station. The maximum number of repetitions may be set separately for multiple multiplexing methods (TDM / SDM / FDM) or may be set commonly.

[0176] The UE may report whether it supports the case where the DCI payload content is the same or the case where the DCI payload content is different for repeated PDCCH (e.g., inter-slot / intra-slot / intra-minislot TDM PDCCH repetition).

[0177] The UE may report to the base station whether it supports reporting the number of repetitions based on the DCI.

[0178] The UE may report to the base station whether it supports PDCCH repetition with soft combining, or whether it supports PDCCH repetition without soft combining.

[0179] The base station may control repeated transmission of the PDCCH based on the capability information reported from the UE. Also, the base station may notify / configure the UE about the above-mentioned UE capability information by using higher layer signaling or the like.

[0180] This embodiment may be applied to multi-chance PDCCH transmission. For example, DCIs that schedule the same PDSCH / PUSCH / RS / TB, etc. may be distinguished from DCIs that result in the same outcome.

[0181] (PDCCH repetition related information / setting information) The information / setting information related to PDCCH repeat transmission may be a transmission condition / transmission parameter applied to PDCCH repeat transmission. The transmission condition / transmission parameter applied to PDCCH repeat transmission may be at least one of the number of PDCCH repetitions (e.g., PDCCH repetition number), a time interval in which PDCCH repetition is applied, and an interval / offset between each PDCCH in PDCCH repeat transmission.

[0182] A PDCCH to which repeated transmission is applied (for example, a multi-PDCCH) may be transmitted from multiple TRPs. A different QCL (or TCI, beam) may be applied to the multi-PDCCH (or PDCCHs transmitted from different TRPs). In the present disclosure, PDCCH repeated transmission is applicable to cases where the PDCCH is transmitted from one or multiple TRPs.

[0183] Information regarding PDCCH repeat transmission (e.g., the number of PDCCH repetitions) may be notified / configured to the UE from the network (e.g., a base station). Information regarding PDCCH repeat transmission may be notified / configured to the UE based on at least one of the following Option 1-A to Option 1-B.

[0184] <Option 1-A> Information regarding PDCCH repeated transmission may be notified / configured from the base station to the UE using higher layer signaling (for example, at least one of an RRC parameter and a MAC CE).

[0185] <Option 1-B> Information regarding PDCCH repeat transmission may be dynamically notified from the base station to the UE using downlink control information (e.g., DCI). Information regarding PDCCH repeat transmission may be notified using a new field set in DCI or may be notified using a field set in the existing system.

[0186] Information about PDCCH repeat transmission may be included in each PDCCH / DCI to which repeat transmission is applied. In this case, the number of PDCCH repetitions included in each PDCCH / DCI may have the same value. Alternatively, the number of PDCCH repetitions included in each PDCCH / DCI may have different values ​​(e.g., the remaining number of repetitions) set.

[0187] The size (e.g., the number of bits) of the field used to report information related to repeated transmission may be determined based on the maximum number of PDCCH repetitions. The UE may determine the maximum number of PDCCH repetitions based on capability information (e.g., UE capability) reported by the UE.

[0188] Alternatively, the maximum number of PDCCH repetitions may be notified / configured to the UE by the base station by higher layer signaling, etc. In this case, the base station may notify the UE of the number of PDCCH repetitions to be actually applied by using DCI. The size (or the number of bits) of the field used to notify the number of PDCCH repetitions may be determined based on the maximum number of PDCCH repetitions notified / configured by higher layer signaling.

[0189] Whether or not the notification of the number of PDCCH repetitions using DCI is applied may be configured by predetermined higher layer signaling. If the predetermined higher layer signaling is configured, the UE may assume that a field for notification of the number of PDCCH repetitions is present in the DCI, and if the predetermined higher layer signaling is not configured, the UE may assume that a field for notification of the number of PDCCH repetitions is not present in the DCI.

[0190] In this way, when PDCCH repeat transmission is applied, the base station notifies / configures information about PDCCH repeat transmission to the UE, allowing the UE to properly understand the transmission conditions / transmission parameters to be applied to PDCCH repeat transmission.

[0191] (PDCCH repetition control corresponding to common search space) When repeated transmission is applied to a downlink control channel (or CORESET / downlink control channel candidate / search space / search space set) used to transmit DCI common to UEs (or DCI transmitted using a common search space set), the UE may apply at least one of the following first to fifth aspects.

[0192] The first to fifth aspects may be applied to a DCI format that uses a common search space set. The DCI format may be, for example, DCI format 2_0 / 2_1 / 2_4 / 2_5, or another DCI format. The common search space set (for example, CSS PDCCH) may be, for example, a type 0 / 0A / 1 / 2 / 3-PDCCH CSS set.

[0193] The first to fifth aspects may be applied separately, or may be applied in a combination of some or all of them. Furthermore, the first to fifth aspects may be applied separately from the above cases 1 to 13, or may be applied in a combination of some or all of them.

[0194] <First aspect> In a first aspect, how to configure an aggregation level and the number of PDCCH candidates for one or more search spaces (e.g., linked search space sets (linked SS sets)) applied / configured for PDCCH repetition is described. The aggregation level may correspond to the aggregation level of CCEs (Control Channel Elements).

[0195] In the following description, an example is given in which there are two associated / linked search space sets, but there may be three or more linked search space sets.

[0196] For a predetermined DCI format (e.g., DCI format 2_0 / 2_4 / 2_5), a search space set and a corresponding CORESET are configured by an upper layer parameter (e.g., SearchSpace). The upper layer parameter also configures aggregation levels for the search space set and the number of PDCCH candidates for each aggregation level (see FIG. 6).

[0197] 6 shows an example of higher layer parameters (e.g., SearchSpace) used to set a search space in an existing system (e.g., Rel. 15 / 16). When common is set as the search space type by the higher layer parameters, the number of PDCCH candidates for each aggregation level is set for a predetermined DCI format (here, DCI formats 2_0, 2_4, and 2_5).

[0198] Assume that multiple (e.g., two) associated / linked search space sets (SS sets) are supported for PDCCH repetition (or when PDCCH repetition is applied / configured) (see Figure 7). Figure 7 shows a case where a first search space set (SS set #1) corresponding to a first PDCCH #1 is linked to a second search space set (SS set #2) corresponding to a second PDCCH #2.

[0199] In this case, the linked search space sets / CORESETs may be set based on at least one of Alt.1-1 and Alt.1-2 below.

[0200] [Alt.1-1] For a given DCI format (e.g., DCI format 2_0 / 2_4 / 2_5), the same aggregation level may be configured for two linked search space sets (see FIG. 8). Also, the same number of PDCCH candidates may be configured for each aggregation level for two linked search space sets. The term "search space set" may be read as "CORESET."

[0201] That is, when PDCCH repetition is applied / configured, the aggregation level / the number of PDCCH candidates for each aggregation level may be configured in common for a plurality of search space sets.

[0202] The UE may not assume that different aggregation levels are configured for two search space sets (e.g., linked SS sets) configured for PDCCH repetition, or that the number of PDCCH candidates corresponding to each aggregation level is different for two search space sets (e.g., linked SS sets) configured for PDCCH repetition.

[0203] When two search space sets (search space IDs) are configured by higher layer parameters, the aggregation levels / number of PDCCH candidates per aggregation level corresponding to each search space ID may be set to the same value.

[0204] In this way, when PDCCH repeated transmission is applied, by commonly setting the search space / number of PDCCH candidates corresponding to each PDCCH, it is possible to suppress an increase in the overhead of higher layer parameters and reduce the load on the UE's monitoring process.

[0205] [Alt.1-2] For a given DCI format (e.g., DCI format 2_0 / 2_4 / 2_5), the two linked search space sets may be set to the same aggregation level or different aggregation levels. Also, for the two linked search space sets, the same number or different numbers of PDCCH candidates may be set for each aggregation level. The search space set may be read as a CORESET.

[0206] That is, when PDCCH repetition is applied / set, for multiple search space sets, the aggregation level / number of PDCCH candidates for each aggregation level may be set separately.

[0207] When two search space sets (search space IDs) are set by upper layer parameters, the aggregation level / number of PDCCH candidates for each search space ID may be set separately (e.g., to different values).

[0208] In each search space set, if the number of PDCCH candidates is different, for example, the first search space set may correspond to X PDCCH candidates and the second search space set may correspond to Y candidates (X≠Y). When X < Y, the X PDCCH candidates corresponding to the first search space set may be included in the Y PDCCH candidates corresponding to the second search space set. In this case, the X PDCCH candidates corresponding to the first search space set may be linked one-to-one with the first X PDCCH candidates corresponding to the second search space set.

[0209] Thus, when PDCCH repeated transmission is applied, by enabling separate setting of the search space / number of PDCCH candidates corresponding to each PDCCH, flexible control of PDCCH repetition can be achieved.

[0210] <The second aspect> In the second example, when PDCCH repetition is applied / configured, a case will be described in which it is determined based on a predetermined condition which PDCCH among a plurality of PDCCHs is to be used as a reference / standard.

[0211] When PDCCH repetition is applied / configured, multiple associated / linked CORESETs / multiple PDCCH candidates / multiple search spaces / multiple search space sets may be configured. In this case, which CORESET / PDCCH candidate / search space / search space set to use as a reference / basis among the multiple linked CORESETs / multiple PDCCH candidates / multiple search spaces / multiple search space sets may be determined based on a predetermined rule.

[0212] DCI format 2_4 (e.g., the first DCI format) is used by the UE to indicate the PRB and OFDM symbol for which the corresponding UL transmission is to be canceled. When the UE cancels a PUSCH transmission / SRS transmission based on the instruction of DCI format 2_4, the UE does not assume / expect that a PUSCH transmission / SRS transmission will be scheduled on the symbol including the symbol of the canceled PUSCH transmission / SRS transmission according to the second DCI format. Here, the last symbol of the second PDCCH reception providing the second DCI format (or used for transmission of the second DCI format) is positioned after (or later than) the first symbol of the first PDCCH reception providing DCI format 2_4 (see FIG. 9).

[0213] The second DCI format may be a DCI format that schedules PUSCH transmission / SRS transmission (for example, DCI format 0_0 / 0_1 / 0_2).

[0214] When repeated transmission is applied / configured / supported to at least one of the first PDCCH and the second PDCCH used for transmitting DCI format 2_4, the question arises as to which PDCCH (or PDCCH candidate) among the multiple PDCCHs (or multiple linked PDCCH candidates) to use as a reference / standard.

[0215] Therefore, the PDCCH to be referenced / reference PDCCH may be determined based on at least one of whether repeat transmission is applied / configured for the first PDCCH and whether repeat transmission is applied / configured for the second PDCCH.

[0216] When repeat transmission is applied / configured to the second PDCCH #2 that provides the second DCI format #2 (see FIG. 10), the second PDCCH (or PDCCH candidate) that serves as a reference among the multiple PDCCHs (or multiple linked PDCCH candidates) may be determined based on the following predetermined rules (for example, at least one of Alt. 2-1-1 to Alt. 2-1-5). Note that PDCCH may be read as PDCCH candidate.

[0217] Alt. 2-1-1: The PDCCH that ends latest in time among multiple (for example, two) PDCCHs linked in the time domain Alt. 2-1-2: The PDCCH that ends earliest in time among multiple (for example, two) PDCCHs linked in the time domain Alt. 2-1-3: The PDCCH that starts latest in time among multiple (for example, two) PDCCHs linked in the time domain Alt. 2-1-4: The PDCCH that starts earliest in time among multiple (for example, two) PDCCHs linked in the time domain Alt. 2-1-5: PDCCH with relatively high (or low) search space set ID / CORESET pool ID / TCI state ID

[0218] When repeated transmission is applied / configured to the first PDCCH #1 that provides the first DCI format #1 (for example, DCI format 2_4) (see FIG. 10), a second PDCCH (or a PDCCH candidate) that serves as a reference among multiple PDCCHs (or multiple linked PDCCH candidates) may be determined based on the following predetermined rules (for example, at least one of Alt. 2-2-1 to Alt. 2-2-5). Note that PDCCH may be read as PDCCH candidate.

[0219] Alt. 2-2-1: The PDCCH that ends latest in time among multiple (for example, two) PDCCHs linked in the time domain Alt. 2-2-2: Among multiple (for example, two) PDCCHs linked in the time domain, the PDCCH that ends earliest in time Alt. 2-2-3: The PDCCH that starts latest in time among multiple (for example, two) PDCCHs linked in the time domain Alt. 2-2-4: The PDCCH that starts earliest in time among multiple (for example, two) PDCCHs linked in the time domain Alt. 2-2-5: PDCCH with relatively high (or low) search space set ID / CORESET pool ID / TCI state ID

[0220] Repeated transmission may be applied to only one of the first PDCCH and the second PDCCH, or a configuration in which repeated transmission is applied to both the first PDCCH and the second PDCCH may be supported.

[0221] The predetermined rule used to determine the reference PDCCH when repeated transmission is applied to the first PDCCH and the predetermined rule used to determine the reference PDCCH when repeated transmission is applied to the second PDCCH may be the same or different.

[0222] For example, it is assumed that PDCCH repetition is configured for both the first PDCCH and the second PDCCH, and Alt. 2-1-1 and Alt. 2-2-4 (different predetermined rules) are applied.

[0223] In this case, when a UE cancels a PUSCH transmission / SRS transmission based on an instruction of a first DCI format (e.g., DCI format 2_4), the UE may not assume / expect that a PUSCH transmission / SRS transmission will be scheduled on a symbol including the symbol of the canceled PUSCH transmission / SRS transmission according to the second DCI format. Here, the last symbol of the PDCCH candidate that ends last in time among two linked PDCCH candidates in the time domain for the second PDCCH reception that provides the second DCI format is positioned later (or later) than the first symbol of the PDCCH candidate that starts first in time among two linked PDCCH candidates in the time domain for the first PDCCH reception that provides DCI format 2_4.

[0224] In this way, the reference PDCCH (or PDCCH candidate) is determined based on at least one of whether repeat transmission is applied / configured for the first PDCCH and whether repeat transmission is applied / configured for the second PDCCH. Furthermore, when PDCCH repeat transmission is applied / configured, the reference PDCCH (or PDCCH candidate) is determined based on a predetermined rule. This makes it possible to appropriately control PDCCH reception (or PDCCH candidate monitoring / DCI detection) even when repeat transmission is applied to the PDCCH.

[0225] <Third aspect> In the third aspect, a control method when PDCCH repetition is supported in a random access procedure (for example, a 4-step / 2-step random access procedure) will be described.

[0226] In the four-step random access procedure, when a UE transmits a PRACH, in response to the PRACH transmission, the UE operates to detect a DCI format (e.g., DCI format 1_0) CRC-scrambled by the RA-RNTI within a predetermined window / predetermined period, which may be configured / indicated by higher layer signaling.

[0227] The predetermined window starts from the first symbol of the earliest CORESET (at least one symbol) configured to receive a PDCCH of the Type 1-PDCCH CSS set after the last symbol of the PRACH occasion corresponding to the PRACH transmission (see Figure 11).

[0228] Alternatively, in a two-step random access procedure, if the UE transmits a PRACH / PUSCH (Message A), in response to the PRACH / PUSCH transmission (or in response to only the PRACH transmission if the PRACH preamble is mapped to a valid PUSCH occasion), the UE operates to detect a DCI format (e.g., DCI format 1_0) CRC-scrambled by the MsgB-RNTI during a predetermined window / predetermined period, which may be configured / indicated by higher layer signaling.

[0229] The predetermined window starts from the first symbol of the earliest CORESET (at least one symbol) configured to receive a PDCCH of the Type 1-PDCCH CSS set after the last symbol of the PUSCH occasion corresponding to the PRACH transmission.

[0230] Alternatively, in a two-step random access procedure, if the UE transmits a PRACH (message A) and the PRACH preamble is not mapped to a valid PUSCH occasion, in response to the PRACH transmission, the UE operates to detect a DCI format (e.g., DCI format 1_0) CRC-scrambled by the MsgB-RNTI within a predetermined window / predetermined period, which may be configured / indicated by higher layer signaling.

[0231] The predetermined window starts from the first symbol of the earliest CORESET (at least one symbol) configured to receive a PDCCH of the Type 1-PDCCH CSS set after the last symbol of the PRACH occasion corresponding to the PRACH transmission.

[0232] When PDCCH repetition transmission is applied / configured / supported for Type 1-PDCCH, the question arises as to which PDCCH (or PDCCH candidate / CORESET) among multiple PDCCHs (or multiple linked PDCCH candidates / CORESETs) to use as reference / standard.

[0233] Therefore, the PDCCH to be referenced / the reference PDCCH may be determined based on whether PDCCH repetition transmission is applied / configured for Type 1-PDCCH.

[0234] Assume that repeated transmission is applied / configured to a PDCCH (for example, a PDCCH for a Type 1-PDCCH common search space set) that provides a DCI format for which detection is attempted in response to a PRACH transmission (see FIG. 12). In this case, a reference PDCCH (or a CORESET / PDCCH candidate) may be determined based on the following predetermined rules (for example, at least one of Alt.3-1 to Alt.3-5).

[0235] Alt.3-1: The latest-ending CORESET / PDCCH candidate among multiple (e.g., two) CORESET / PDCCH candidates linked in the time domain Alt.3-2: The CORESET / PDCCH candidate that ends earliest in time among multiple (e.g., two) CORESET / PDCCH candidates linked in the time domain Alt.3-3: The CORESET / PDCCH candidate that starts latest in time among multiple (e.g., two) CORESET / PDCCH candidates linked in the time domain Alt.3-4: The CORESET / PDCCH candidate that starts earliest in time among multiple (e.g., two) CORESET / PDCCH candidates linked in the time domain Alt. 3-5: CORESET / PDCCH candidate with relatively high (or low) search space set ID / CORESET ID / CORESET pool ID / TCI state ID

[0236] For example, it is assumed that PDCCH repetition is configured for the PDCCH for a Type 1-PDCCH common search space set, and Alt. 3-3 is applied.

[0237] In this case, when the UE transmits the PRACH in the four-step random access procedure, in response to the PRACH transmission, the UE operates to detect a DCI format (e.g., DCI format 1_0) CRC-scrambled by the RA-RNTI within a predetermined window / predetermined period. The predetermined window / predetermined period may be configured / indicated by higher layer signaling.

[0238] Furthermore, the predetermined window starts from the first symbol of the earliest CORESET (at least one symbol) configured to receive a PDCCH of the Type 1-PDCCH CSS set after the last symbol of the PRACH occasion corresponding to the PRACH transmission. If the earliest CORESET is linked with another CORESET for repeated transmission, the predetermined window may start from the first symbol of the CORESET (here, CORESET#2) that started later in time among the two linked CORESETs (see FIG. 13).

[0239] In this way, the reference PDCCH (or CORESET) is determined based on whether repeat transmission is applied / configured for the PDCCH of the Type 1-PDCCH CSS set. Furthermore, if PDCCH repeat transmission is applied / configured, the reference PDCCH (or CORESET) is determined based on a predetermined rule. This makes it possible to appropriately control PDCCH reception (or PDCCH candidate monitoring / DCI detection) even when repeat transmission is applied to the PDCCH.

[0240] The third aspect may be applied when PDCCH repeated transmission (or multiple linked PDCCH candidates / multiple linked CORESETs) is applied / configured. For example, the UE may control to apply the third aspect based on the configuration / instruction of RRC / MAC CE / DCI. Alternatively, the UE may apply the third aspect when multiple (e.g., two) CORESETs / search space sets are configured for the PDCCH of Type 1-PDCCH common search space and linked for PDCCH repeated transmission.

[0241] Alternatively, the UE may apply the third aspect if the CORESET / search space set configured for the PDCCH of Type 1-PDCCH common search space is configured / informed as being linked / associated with another CORESET / search space set.

[0242] <Fourth aspect> In a fourth aspect, a control method will be described in a case where PDCCH repetition is supported in a random access procedure using a PDCCH order (for example, a non-contention type 4-step / 2-step random access procedure).

[0243] When a PRACH transmission is triggered by a PDCCH order, the UE performs the PRACH transmission and attempts to detect a DCI format in response to the PRACH transmission. Specifically, the UE operates to detect a DCI format CRC-scrambled by the RA-RNTI (e.g., DCI format 1_0) in response to the PRACH transmission initiated by the PDCCH order that triggers a contention-free random access procedure for the SpCell.

[0244] In this case, the UE may assume that the PDCCH (e.g., the second PDCCH) including the DCI format and the PDCCH order (e.g., the first PDCCH) have the same quasi-co-location characteristics (e.g., DMRS antenna port quasi-co-location characteristics) (see FIG. 14).

[0245] For example, when the UE detects a DCI format in response to a PRACH transmission, the UE may perform reception processing assuming that the second PDCCH used to transmit the DCI format is the PDCCH order (first PDCCH) and QCL.

[0246] When repeat transmission is applied / configured / supported for at least one of the PDCCH orders (e.g., the first PDCCH) and the second PDCCH, the question arises as to which PDCCH (or PDCCH candidate / CORESET) among the multiple PDCCHs (or multiple linked PDCCH candidates / multiple CORESETs) to use as a reference / criteria for determining the QCL.

[0247] Therefore, the PDCCH to be referenced in determining the QCL may be determined based on at least one of whether repeat transmission is applied / configured for the first PDCCH and whether repeat transmission is applied / configured for the second PDCCH (see FIG. 15).

[0248] <When repeat transmission is applied / configured for both PDCCHs> Assume that repeated transmission is applied to both the PDCCH order (first PDCCH) and the second PDCCH that provides the DCI format to be detected in response to the PRACH transmission. In this case, at least one of the following Alt.4-1-0 to Alt.4-1-2 may be applied.

[0249] [Alt.4-1-0] A configuration may be adopted in which repeat transmission is not applied / configured to both the first PDCCH and the second PDCCH. The UE does not need to consider a case in which repeat transmission is applied / configured to both the first PDCCH and the second PDCCH.

[0250] For example, the UE may not assume that PDCCH repeat transmission is applied to a PDCCH (second PDCCH) including DCI format 1_0, or that PDCCH repeat transmission is applied to a PDCCH order (first PDCCH).

[0251] [Alt.4-1-1] The UE may assume that the multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the second PDCCH and the multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the PDCCH order (first PDCCH) each have the same quasi-co-location property of the DMRS antenna port.

[0252] For example, among the linked PDCCH candidates / CORESETs corresponding to the second PDCCH#2, a PDCCH candidate / CORESET that starts / ends earlier (or later) in time may have the same QCL as a PDCCH candidate / CORESET that starts / ends earlier (or later) in time among the linked PDCCH candidates / CORESETs corresponding to the PDCCH order (see Figure 16).

[0253] Alternatively, among the linked PDCCH candidates / CORESETs corresponding to the second PDCCH, a CORESET / PDCCH candidate having a relatively higher (or lower) search space set ID / CORESET ID / CORESET pool ID may have the same QCL as a PDCCH candidate / CORESET having a relatively higher (or lower) search space set ID / CORESET ID / CORESET pool ID among the linked PDCCH candidates / CORESETs corresponding to the PDCCH order.

[0254] [Alt.4-1-2] The UE may assume that one of the multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the second PDCCH and one of the multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the PDCCH order (first PDCCH) each have the same DMRS antenna port quasi-co-location property.

[0255] One of the linked PDCCH candidates / CORESETs may be determined by applying the predetermined rule shown in the third aspect. For example, a reference / standard PDCCH candidate / CORESET determined based on at least one of Alt.3-1 to Alt.3-5 shown in the third aspect may be selected as the one PDCCH candidate / CORESET. Note that different predetermined rules (e.g., Alt) may be applied to the first PDCCH (e.g., PDCCH order) and the second PDCCH.

[0256] In Alt. 4-1-1 / Alt. 4-1-2, multiple linked PDCCH candidates / CORESETs corresponding to a first PDCCH (e.g., PDCCH order) may have the same DMRS antenna port pseudo-co-location characteristic, and multiple linked PDCCH candidates / CORESETs corresponding to a second PDCCH may have the same DMRS antenna port pseudo-co-location characteristic.

[0257] <When repeat transmission is applied / configured for the first PDCCH> Assume that repeated transmission is applied to the PDCCH order (first PDCCH), and repeated transmission is not applied to the second PDCCH that provides the DCI format that is attempted to be detected in response to the PRACH transmission. The second PDCCH may be a single transmission. In this case, at least one of the following Alt. 4-2-0 to Alt. 4-2-2 may be applied.

[0258] [Alt.4-2-0] A configuration may be adopted in which repeat transmission is not applied / configured to the first PDCCH. The UE does not need to consider a case in which repeat transmission is applied / configured to the first PDCCH.

[0259] [Alt.4-2-1] The UE may assume that the second PDCCH (a PDCCH including DCI format 1_0) and multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the PDCCH order have the same quasi-co-location property of the DMRS antenna port (see FIG. 17). That is, the UE may assume that the second PDCCH, which is a single transmission, is in a QCL with the multiple first PDCCHs (or CORESET / PDCCH candidates) to which repeated transmission is applied. In this case, it may mean that the repeated PDCCHs (e.g., the multiple first PDCCHs) have the same QCL.

[0260] [Alt.4-2-2] The UE may assume that the second PDCCH (a PDCCH including DCI format 1_0) and a specific one of the multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the PDCCH order have the same quasi-co-location property of the DMRS antenna port. That is, the UE may assume that the second PDCCH, which is a single transmission, shares a QCL with one of the multiple first PDCCHs (or CORESET / PDCCH candidates) to which repeated transmission is applied. In this case, the same QCL or different QCLs may be applied to the PDCCH repetitions (e.g., the multiple first PDCCHs).

[0261] A specific one of a plurality of (for example, two) linked PDCCH candidates / CORESETs corresponding to a PDCCH order may be determined by applying a predetermined rule shown in the third aspect. For example, a reference / standard PDCCH candidate / CORESET determined based on at least one of Alt.3-1 to Alt.3-5 shown in the third aspect may be selected as the one PDCCH candidate / CORESET.

[0262] <When repeat transmission is applied / configured for the second PDCCH> Assume that repeated transmission is applied to the second PDCCH that provides a DCI format that is attempted to be detected in response to a PRACH transmission, and repeated transmission is not applied to the PDCCH order (first PDCCH). The first PDCCH may be a single transmission. In this case, at least one of the following Alt. 4-3-0 to Alt. 4-3-2 may be applied.

[0263] [Alt.4-3-0] A configuration may be adopted in which repeat transmission is not applied / configured to the second PDCCH. The UE does not need to consider a case in which repeat transmission is applied / configured to the second PDCCH.

[0264] [Alt.4-3-1] The UE may assume that multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the second PDCCH (PDCCH including DCI format 1_0) and the PDCCH order have the same quasi-co-location property of DMRS antenna ports (see FIG. 18). That is, the UE may assume that the multiple second PDCCHs (or CORESET / PDCCH candidates) to which repeated transmission is applied have the same QCL as the first PDCCH to which single transmission is applied. In this case, it may mean that the repeated PDCCHs (e.g., multiple second PDCCHs) have the same QCL.

[0265] [Alt.4-3-2] The UE may assume that a specific one of multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the second PDCCH (a PDCCH including DCI format 1_0) and the PDCCH order have the same quasi-co-location property of the DMRS antenna port. That is, the UE may assume that one of the multiple second PDCCHs (or CORESET / PDCCH candidates) to which repeated transmission is applied is the second PDCCH to be single-transmitted and has a QCL. In this case, the same QCL or different QCLs may be applied to the PDCCH repetitions (e.g., multiple second PDCCHs).

[0266] A specific one of the multiple (e.g., two) linked PDCCH candidates / CORESETs corresponding to the second PDCCH may be determined by applying the predetermined rule shown in the third aspect. For example, a reference / standard PDCCH candidate / CORESET determined based on at least one of Alt.3-1 to Alt.3-5 shown in the third aspect may be selected as the one PDCCH candidate / CORESET.

[0267] Regarding whether the first PDCCH that becomes the second PDCCH / PDCCH order including DCI format 1_0 becomes PDCCH repetition, UE capability (for example, UE capability) may be defined for each of the above cases.

[0268] <Fifth aspect> In the fifth aspect, a method for configuring a plurality of linked search space sets, each corresponding to a PDCCH to which repeated transmission is applied (or configured for PDCCH repetition), will be described. The fifth aspect may be applied to, for example, a common search space (e.g., type 0 / 0A / 1 / 2 PDCCH-CSS).

[0269] If repeated transmission for PDCCH is applied / configured / supported, multiple (e.g., two) linked search space sets may be configured. The multiple linked search space sets may have the same search space set type (e.g., UE-specific SS search space (USS) / common search space (CSS)). The multiple linked search space sets may correspond to the same DCI format.

[0270] When PDCCH repetition transmission is performed within a slot (e.g., intra-slot PDCCH repetition), multiple search space sets may have the same periodicity, offset, and duration. The periodicity and offset may be configured by higher layer parameters (e.g., monitoringSlotPeriodicityAndOffset).

[0271] In multiple search space sets, multiple PDCCH candidates may be configured in a linked manner. The multiple linked search space sets may be configured with the same number of PDCCH candidates for each aggregation level.

[0272] In existing systems (e.g., Rel. 16 and earlier), a search space set corresponding to a type 0-PDCCH (e.g., a PDCCH that schedules a PDSCH including SIB1) is configured by a first higher layer parameter (e.g., SearchSpaceZero), and a CORESET corresponding to a type 0-PDCCH (e.g., a CORESET for a PDCCH that schedules a PDSCH including SIB1) is configured by a second higher layer parameter (e.g., ControlResourceSetZero).

[0273] The UE determines the CORESET corresponding to the Type 0-PDCCH search space set based on the association (e.g., the table in Figure 19A) between an index (entry candidate) that may be indicated in the second higher layer parameter and a set of resource blocks and symbols of the CORESET.

[0274] The UE also determines the parameters of the PDCCH monitoring occasion corresponding to the Type 0-PDCCH search space set based on the association (e.g., the table in Figure 19B) between the index (entry candidate) that can be indicated in the first upper layer parameter and the number of search spaces per slot, the starting symbol index, etc.

[0275] The question is whether a first upper layer parameter (e.g., SearchSpaceZero) can be set in association / link with another search space set, or how to control the association / link setting if so. Alternatively, the question is whether a second upper layer parameter (e.g., ControlResourceSetZero) can be set in association / link with another CORESET, or how to control the association / link setting if so.

[0276] In addition, in existing systems (for example, Rel. 15 / 16), the search space set of the common search space is set by an upper layer parameter that indicates a search space ID.

[0277] The search space set corresponding to Type 0-PDCCH is supported to be configured by a higher layer parameter (eg, searchSpaceSIB1) indicating a search space ID (eg, SearchSpaceID).

[0278] The search space set corresponding to Type 0 A-PDCCH is supported to be configured by a higher layer parameter (eg, searchSpaceOtherSystemInformation) that indicates a search space ID.

[0279] The search space set corresponding to Type 1-PDCCH is supported to be configured by a higher layer parameter (eg, ra-SearchSpace) that indicates a search space ID.

[0280] The search space set corresponding to Type 2-PDCCH is supported to be configured by a higher layer parameter (eg, pagingSearchSpace) that indicates a search space ID.

[0281] In this way, the UE can determine the search space set to be configured for type 0 / 0A / 1 / 2-PDCCH by referring to the search space set configured by specified upper layer parameters (searchSpaceSIB1 / searchSpaceOtherSystemInformation / ra-SearchSpace / pagingSearchSpace).

[0282] The question is whether a search space set configured for type 0 / 0A / 1 / 2-PDCCH can be configured in association / link with other search space sets, and if so, how to control this.

[0283] <<SearchSpaceZero>> When a search space set is set for the first upper layer parameter (for example, SearchSpaceZero), at least one of the following Alt.5-1-1 to Alt.5-1-2 may be applied.

[0284] [Alt.5-1-1] The first higher layer parameter (eg, SearchSpaceZero) may be configured to link with other search space sets configured by the RRC / MAC CE.

[0285] For SearchSpaceZero, multiple (for example, two) search space sets configured / determined by Options 5-1-1A to 5-1-1C below may be considered to be linked for PDCCH repetition.

[0286] [[Option 5-1-1A]] Multiple (e.g., two) values ​​may be set / signaled by a higher layer parameter (e.g., SearchSpaceZero), each corresponding to a linking search space set (see FIG. 20A). Each value may indicate an index from a predefined association (e.g., table) corresponding to a parameter set of a PDCCH monitoring occasion.

[0287] The predetermined association (e.g., table) may be a table in which an association (e.g., the table in FIG. 19B) defined in an existing system (Rel.15 / Rel.16) is reused and new entries are added. Alternatively, the predetermined association (e.g., table) may be obtained by defining a new association (e.g., table) that includes the same parameters as the association (e.g., the table in FIG. 19B) defined in the existing system (Rel.15 / Rel.16).

[0288] Alternatively, one search space set may be configured using a first upper layer parameter (e.g., SearchSpaceZero) and another search space set may be configured using another upper layer parameter (e.g., SearchSpaceZero-link) (see FIG. 20B).

[0289] [[Option 5-1-1B]] One value may be set / signaled by a higher layer parameter (e.g., SearchSpaceZero), and the value may indicate an index from a predefined association (e.g., a table) corresponding to multiple (e.g., two) parameter sets of PDCCH monitoring occasions (see FIG. 20C). That is, multiple search space sets may be determined by a single index set / signaled by a higher layer parameter and a predetermined association.

[0290] A predetermined association (e.g., a table) may be obtained by defining a new association (e.g., a table) that includes parameters similar to those of an association (e.g., the table in FIG. 19B) defined in an existing system (Rel. 15 / Rel. 16).

[0291] [[Option 5-1-1C]] One value may be set / signaled by a higher layer parameter (e.g., SearchSpaceZero), and the value may indicate an index from a predefined association (e.g., a table) corresponding to a parameter set of a PDCCH monitoring occasion for one search space set. Another search space set (or a parameter of a PDCCH monitoring occasion for another search space set) linked with one search space set obtained from the predefined association with the higher layer parameter may be determined based on a predetermined rule (see FIG. 20D).

[0292] The predetermined association (for example, a table) may be an association (for example, the table in FIG. 19B) defined in an existing system (Rel. 15 / Rel. 16).

[0293] The predetermined rule may be, for example, that the monitoring occasion of another search space set is determined from at least one of the slot / symbol offset of the search space set set by a higher layer parameter and the PDCCH monitoring occasion.

[0294] [Alt.5-1-2] Alternatively, the first higher layer parameter (e.g., SearchSpaceZero) may be configured not to be linked with other search space sets, and the UE may not assume that SearchSpaceZero is configured to be linked with other search space sets.

[0295] <<ControlResourceSetZero>> When one or more CORESETs (for example, linked CORESETs) are set for the second upper layer parameter (for example, ControlResourceSetZero), at least one of the following Alt.5-2-1 to Alt.5-2-2 may be applied.

[0296] [Alt.5-2-1] One CORESET may be set. The one CORESET may be set as the CORESET used in the existing system. Multiple (e.g., two) linked search space sets determined in the above-mentioned SearchSpaceZero may be associated with the same CORESET.

[0297] [Alt.5-2-2] The multiple (e.g., two) CORESETs configured / determined by the following Options 5-2-1A to 5-2-1C may be considered to be linked / associated with each PDCCH repetition (or the multiple (e.g., two) linked search space sets determined in the above-mentioned SearchSpaceZero).

[0298] [[Option 5-2-1A]] Multiple (e.g., two) values ​​may be set / signaled by an upper layer parameter (e.g., ControlResourceSetZero), each corresponding to a linked CORESET (see FIG. 21A). Each value may indicate an index from a predefined association (e.g., a table) corresponding to a parameter set of the CORESET.

[0299] The predetermined association (e.g., table) may be a table in which an association (e.g., the table in FIG. 19A) defined in an existing system (Rel.15 / Rel.16) is reused and new entries are added. Alternatively, the predetermined association (e.g., table) may be obtained by defining a new association (e.g., table) that includes the same parameters as the association (e.g., the table in FIG. 19A) defined in the existing system (Rel.15 / Rel.16).

[0300] Alternatively, one CORESET may be configured using a second upper layer parameter (e.g., ControlResourceSetZero) and another CORESET may be configured using another upper layer parameter (e.g., ControlResourceSetZero-link) (see FIG. 21B).

[0301] [[Option 5-1-1B]] One value may be set / notified by an upper layer parameter (e.g., ControlResourceSetZero), and the value may indicate an index from a predefined association (e.g., a table) corresponding to multiple (e.g., two) parameter sets of CORESET (see FIG. 21C). In other words, multiple CORESETs may be determined by one index set / notified by an upper layer parameter and a predetermined association.

[0302] A predetermined association (e.g., a table) may be obtained by defining a new association (e.g., a table) that includes parameters similar to those of an association (e.g., the table in FIG. 19A) defined in an existing system (Rel. 15 / Rel. 16).

[0303] [[Option 5-1-1C]] A value may be set / notified by an upper layer parameter (e.g., ControlResourceSetZero), and the value may indicate an index from a predefined association (e.g., a table) corresponding to one parameter set of one CORESET. Another CORESET (or a parameter of another CORESET) linked with one CORESET obtained from the predefined association with the upper layer parameter may be determined based on a predetermined rule (see FIG. 21D).

[0304] The predetermined association (for example, a table) may be an association (for example, the table in FIG. 19A) defined in an existing system (Rel. 15 / Rel. 16).

[0305] The predetermined rule may be, for example, that the frequency location of another CORESET is determined from at least one of the resource block (RB) offset and frequency location of the CORESET set by a higher layer parameter.

[0306] Note that the two CORESETs may be associated with the two search space sets, respectively, according to a predefined rule. For example, the first CORESET may be associated with the first search space set, and the second CORESET may be associated with the second search space set. Alternatively, the two CORESETs may be associated with the two search space sets by explicit configuration (e.g., RRC / MAC CE).

[0307] <Type 0 / 0A / 1 / 2-PDCCH> When a search space set is configured for type 0 / 0A / 1 / 2-PDCCH, at least one of the following Alt. 5-3-1 to Alt. 5-3-2 may be applied.

[0308] [Alt.5-3-1] The search space set configured for the type 0 / 0A / 1 / 2-PDCCH may be configured by the RRC / MAC CE to link with other search space sets.

[0309] For type 0 / 0A / 1 / 2-PDCCH, multiple (e.g., two) search space sets may be configured using predetermined higher layer parameters. The predetermined higher layer parameters may be searchSpaceSIB1 / searchSpaceOtherSystemInformation / ra-SearchSpace / pagingSearchSpace. In this case, the predetermined higher layer parameters may include information indicating multiple (e.g., two) search space IDs (see FIG. 22).

[0310] Alternatively, for type 0 / 0A / 1 / 2-PDCCH, multiple (e.g., two) search space sets may be configured using multiple higher layer parameters. For example, one search space set configured using higher layer parameters (searchSpaceSIB1 / searchSpaceOtherSystemInformation / ra-SearchSpace / pagingSearchSpace) supported in existing systems may be configured to be linked with a search space set configured using other higher layer parameters. The other higher layer parameters may be, for example, searchSpaceSIB1-link / searchSpaceOtherSystemInformation-link / ra-SearchSpace-link / pagingSearchSpace-link.

[0311] Multiple search space sets may be linked / associated to a PDCCH repetition using explicit RRC / MAC CE, or, if multiple search space sets are configured, they may be considered to be linked / associated to a PDCCH repetition without any explicit configuration / indication.

[0312] [Alt.5-3-2] A search space set configured for a type 0 / 0A / 1 / 2-PDCCH may be configured not to be linked with other search space sets, and the UE may not assume that a search space set configured for a type 0 / 0A / 1 / 2-PDCCH is configured to be linked with other search space sets.

[0313] (UE capability information) In the above-described embodiments (for example, the first to fifth aspects), the following UE capabilities may be configured. Note that the following UE capabilities may be interpreted as parameters (for example, higher layer parameters) configured in the UE from the network (for example, the base station).

[0314] UE capability information regarding whether PDCCH repetition transmission (eg, PDCCH repetition) is supported may be defined.

[0315] UE capability information regarding whether PDCCH repetition is supported for a predetermined type of common search space (e.g., CSS) may be defined. The predetermined type of common search space may be, for example, at least one of Type 0 CSS, Type 0A CSS, Type 1 CSS, Type 2 CSS, and Type 3 CSS.

[0316] UE capability information regarding whether PDCCH repetition is supported for a predetermined DCI format may be defined. The predetermined DCI format may be, for example, at least one of DCI formats 2_0, 2_1, 2_4, and 2_5.

[0317] UE capability information regarding whether PDCCH repetition is supported for search space set 0 may be defined.

[0318] UE capability information regarding whether PDCCH repetition is supported for a PDCCH order that initiates / triggers PRACH transmission may be defined.

[0319] The above embodiments may be applied to a UE that supports / reports at least one of the above UE capabilities, or may be applied to a UE that is configured by the network.

[0320] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0321] 23 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0322] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may 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)), etc.

[0323] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0324] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0325] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0326] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0327] Each CC may 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 be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0328] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0329] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0330] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0331] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0332] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, 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), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0333] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0334] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0335] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0336] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0337] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0338] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0339] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0340] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0341] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0342] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0343] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0344] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0345] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0346] (base station) 24 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0347] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0348] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0349] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0350] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0351] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0352] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0353] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0354] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0355] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0356] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0357] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0358] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0359] The transceiver 120 (reception processing unit 1212) may apply 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 include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0360] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure 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 be output to the control unit 110.

[0361] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0362] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0363] The transceiver 120 may transmit information about a search space set in which predetermined conditions are set commonly or separately for multiple downlink control channels to which repeated transmission is applied. The control unit 110 may control transmission of multiple downlink control information based on the information about the search space set.

[0364] The transceiver 120 may transmit first downlink control information instructing cancellation of UL transmission. The controller 110 may control whether to schedule uplink shared channel transmission based on the symbol position of a first downlink control channel that provides the first downlink control information and the symbol position of a second downlink control channel that provides second downlink control information that schedules uplink shared channel transmission. Furthermore, the controller 110 may determine the symbol positions of the first downlink control channel and the second downlink control channel based on at least one of whether to perform repeated transmission of the first downlink control channel and whether to perform repeated transmission of the second downlink control channel.

[0365] The transceiver 120 may receive at least one of a random access channel and an uplink shared channel. In response to receiving at least one of the random access channel and the uplink shared channel, the controller 110 may control transmission of downlink control information in a predetermined window period. The controller 110 may also determine the predetermined window period based on whether or not a downlink control channel that provides downlink control information is repeatedly transmitted.

[0366] The transceiver 120 may transmit a first downlink control channel that triggers transmission of a random access channel. When transmitting downlink control information in response to reception of the random access channel, the control unit 110 may control the first downlink control channel and the second downlink control channel that provides the downlink control information so that they have quasi-co-location (e.g., quasi-co-location characteristics of DMRS antenna ports). Furthermore, the control unit 110 may determine the first downlink control channel and the second downlink control channel that have quasi-co-location based on at least one of whether or not repeated transmission of the first downlink control channel is performed and whether or not repeated transmission of the second downlink control channel is performed.

[0367] The transceiver 120 may transmit information on at least one of a search space set and a control resource set for repeated transmission of the downlink control channel. The control unit 110 may control transmission of the downlink control channel to which repeated transmission is applied by using at least one of a plurality of associated search space sets and a plurality of associated control resource sets obtained based on the information.

[0368] (user terminal) 25 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0369] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0370] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0371] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0372] The transceiver 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 transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0373] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0374] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0375] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0376] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0377] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0378] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0379] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0380] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0381] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0382] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0383] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0384] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0385] The transceiver 220 may receive information about a search space set in which a predetermined condition is set commonly or separately for multiple downlink control channels to which repeated transmission is applied. The control unit 210 may control reception of multiple downlink control information based on the information about the search space set. The predetermined condition may be at least one of an aggregation level and the number of downlink control channel candidates for each aggregation level. At least one of the aggregation level (e.g., CCE AL) and the number of downlink control channel candidates for each aggregation level may be set differently for multiple downlink control channels. When the number of downlink control channel candidates for each aggregation level is set differently for multiple downlink control channels, at least some of the downlink control channel candidates set for each downlink control channel may be associated.

[0386] The transceiver 220 may receive first downlink control information instructing cancellation of UL transmission. The controller 210 may determine whether or not to schedule uplink shared channel transmission based on the symbol position of a first downlink control channel that provides the first downlink control information and the symbol position of a second downlink control channel that provides second downlink control information that schedules uplink shared channel transmission. Furthermore, the controller 210 may determine the symbol positions of the first downlink control channel and the second downlink control channel based on at least one of whether or not to perform repeated transmission of the first downlink control channel and whether or not to perform repeated transmission of the second downlink control channel.

[0387] Furthermore, when repeated transmission is applied to the second downlink control channel, the control unit 210 may determine whether or not the uplink shared channel transmission is scheduled based on the symbol position of a specific second downlink control channel selected from the multiple second downlink control channels based on a first criterion. Furthermore, when repeated transmission is applied to the first downlink control channel, the control unit 210 may determine whether or not the uplink shared channel transmission is scheduled based on the symbol position of a specific first downlink control channel selected from the multiple first downlink control channels based on a second criterion. It may be supported that the first criterion and the second criterion are applied / set differently.

[0388] The transceiver 220 may transmit at least one of a random access channel and an uplink shared channel. The controller 210 may perform control to detect downlink control information within a predetermined window period in response to transmission of at least one of the random access channel and the uplink shared channel. The controller 210 may also determine the predetermined window period based on whether or not a downlink control channel that provides downlink control information is repeatedly transmitted.

[0389] Furthermore, when repeated transmission is applied to downlink control channels that provide downlink control information, the control unit 210 may determine the predetermined window period based on a specific control resource set or a specific downlink control channel candidate among the control resource sets or downlink control channel candidates corresponding to each downlink control channel. The predetermined period may start from the first symbol of the specific control resource set or the specific downlink control channel candidate after the last symbol of the random access channel occasion or the uplink shared channel occasion corresponding to the transmission of the random access channel. The control resource sets or downlink control channel candidates corresponding to each downlink control channel may be set in association with each other.

[0390] The transceiver 220 may transmit a random access channel based on the first downlink control channel. When detecting downlink control information in response to transmission of the random access channel, the control unit 210 may assume that the first downlink control channel and a second downlink control channel providing the downlink control information are quasi-colocated. Furthermore, the control unit 210 may determine whether the first downlink control channel and the second downlink control channel are quasi-colocated based on at least one of whether or not the first downlink control channel is repeatedly transmitted and whether or not the second downlink control channel is repeatedly transmitted.

[0391] When repeated transmission is applied to the first downlink control channel and the second downlink control channel, at least one of the multiple first downlink control channels to which repeated transmission is applied and at least one of the multiple second downlink control channels to which repeated transmission is applied may have quasi-collocated locations.When repeated transmission is applied to the first downlink control channel but not to the second downlink control channel, all or a specific first downlink control channel of the multiple first downlink control channels to which repeated transmission is applied may have quasi-collocated locations with the second downlink control channel.When repeated transmission is applied to the second downlink control channel but not to the first downlink control channel, all or a specific second downlink control channel of the multiple second downlink control channels to which repeated transmission is applied may have quasi-collocated locations with the first downlink control channel.

[0392] The transceiver 220 may receive information on at least one of a search space set and a control resource set for repeated transmission of the downlink control channel. The control unit 210 may control reception of the downlink control channel to which repeated transmission is applied, based on at least one of a plurality of associated search space sets and a plurality of associated control resource sets obtained based on the information.

[0393] Furthermore, the control unit 210 may determine at least one of a plurality of associated search space sets and a plurality of associated control resource sets based on a value notified by higher layer signaling and a predefined association. A plurality of search space sets may be associated with the same control resource set. Furthermore, the control unit 210 may determine one search space set and one control resource set based on the information, and may determine another search space set associated with the one search space set and another control resource set associated with the one control resource set based on a predetermined condition / predetermined rule.

[0394] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0395] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0396] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 26 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0397] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0398] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0399] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0400] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0401] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0402] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0403] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0404] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0405] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0406] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0407] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0408] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0409] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0410] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0411] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0412] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0413] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0414] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0415] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0416] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0417] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0418] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0419] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0420] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0421] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0422] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0423] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0424] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0425] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0426] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0427] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0428] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0429] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0430] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0431] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0432] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0433] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0434] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0435] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0436] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0437] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0438] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0439] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0440] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit 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. may be used interchangeably.

[0441] In this 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," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0442] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0443] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0444] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0445] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0446] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0447] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0448] 27 is a diagram showing an example of a vehicle according to an embodiment. As shown in FIG. 27, a vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0449] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0450] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0451] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0452] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0453] The driving assistance system unit 64 is configured with various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), Artificial Intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0454] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0455] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the above-mentioned base station 10 or user terminal 20. Furthermore, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (or may function as at least one of the base station 10 and user terminal 20).

[0456] The communication module 60 may transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49 and information obtained based on the signals to an external device via wireless communication.

[0457] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on an information service unit 59 provided in the vehicle. The communication module 60 also stores the various information received from the external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0458] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as uplink channel and downlink channel may be read as sidelink channel.

[0459] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0460] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0461] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0462] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), 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 The present invention may be applied to systems that use 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0463] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0464] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0465] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0466] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0467] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0468] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0469] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0470] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0471] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0472] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0473] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0474] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A method for transmitting a first downlink control channel including: receiving the first downlink control information instructing a first UL transmission to be canceled; a control unit that, when canceling the first UL transmission based on an instruction of the first downlink control information, determines that a second UL transmission is not scheduled on a symbol including a symbol of the canceled first UL transmission by the second downlink control information; A terminal characterized in that, when the first downlink control channel reception includes two downlink control channel candidates, the last symbol of the second downlink control channel reception providing the second downlink control information is arranged after the first symbol of the downlink control channel candidate that is earlier in the time domain among the two downlink control channel candidates.

2. The terminal described in Claim 1, characterized in that when the second downlink control channel reception providing the second downlink control information includes two downlink control channel candidates, the last symbol of the second downlink control channel reception is the last symbol of the downlink control channel candidate that is later in the time domain among the two downlink control channel candidates included in the second downlink control channel reception.

3. A method of receiving a first downlink control channel providing first downlink control information instructing cancellation of a first UL transmission; and when canceling the first UL transmission based on an instruction of the first downlink control information, determining that a second UL transmission is not scheduled on a symbol including a symbol of the canceled first UL transmission by the second downlink control information; a first downlink control channel candidate that is earlier in the time domain than a first symbol of the first downlink control channel candidate, and a second downlink control channel candidate that is earlier in the time domain than a first symbol of the first ...

4. A transmitter that transmits a first downlink control channel that provides first downlink control information that instructs cancellation of a first UL transmission; a control unit that, when the first downlink control information instructs cancellation of the first UL transmission, controls not to schedule a second UL transmission according to second downlink control information for a symbol including a symbol of the first UL transmission for which cancellation is instructed; A base station characterized in that, when the first downlink control channel reception includes two downlink control channel candidates, the last symbol of the second downlink control channel reception providing the second downlink control information is arranged after the first symbol of the downlink control channel candidate that is earlier in the time domain among the two downlink control channel candidates.

5. A system having a terminal and a base station, The terminal a receiver for receiving a first downlink control channel providing first downlink control information instructing cancellation of a first UL transmission; a control unit that, when canceling the first UL transmission based on an instruction of the first downlink control information, determines that a second UL transmission is not scheduled by second downlink control information on a symbol including a symbol of the canceled first UL transmission, and when the first downlink control channel reception includes two downlink control channel candidates, a last symbol of the second downlink control channel reception providing the second downlink control information is arranged after a first symbol of the downlink control channel candidate that is earlier in the time domain among the two downlink control channel candidates; The base station a transmitter that transmits the first downlink control channel; A control unit that, when instructing cancellation of the first UL transmission, controls so as not to schedule a second UL transmission using second downlink control information for a symbol including the symbol of the first UL transmission for which cancellation has been instructed.

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