Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes a reception unit that receives downlink control information (DCI) that schedules a physical downlink shared channel (PUSCH), and a control unit that uses, in a case where the DCI is DCI format 0_1, and activation information of a default path loss reference signal is provided, and a first parameter and a second parameter for the PUSCH are not set or activated, a reference signal for a sounding reference signal (SRS) corresponding to the PUSCH for path loss calculation. According to one embodiment of the present disclosure, a reference signal used in path loss calculation can be appropriately determined.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. BACKGROUND

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further higher-speed data rates, lower delay, and so on (Non-Patent Literature 1). Further, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further larger capacity, higher density, and so on of LTE (3rd Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] A subsequent system of LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also being studied.

[0004] PRIOR ART DOCUMENTS

[0005] NON-PATENT LITERATURE

[0006] Non-Patent Literature 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

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In a future wireless communication system (for example, NR), a user terminal (terminal, user terminal (user terminal), User Equipment (UE)) is being researched to control transmission processing based on information related to Quasi-Co-Location (QCL), information related to a path loss reference signal.

[0009] However, there are cases where a reference signal (RS) used in path loss calculation is not clear. If the RS used in path loss calculation cannot be appropriately decided, there is a concern that it will lead to a decrease in throughput, a decrease in communication quality, and the like.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal that appropriately decides a reference signal used in path loss calculation, a wireless communication method, and a base station.

[0011] Means for solving the problem

[0012] The terminal according to an aspect of the present disclosure includes a reception unit that receives downlink control information (DCI) that schedules a physical downlink shared channel (PUSCH), and a control unit that uses a reference signal for a sounding reference signal (SRS) corresponding to the PUSCH for path loss calculation in a case where the DCI is DCI format 0_1, and activation information of a default path loss reference signal is provided, and a path loss reference signal for the PUSCH is not set or activated.

[0013] Effects of the Invention

[0014] According to an aspect of the present disclosure, a reference signal used in path loss calculation can be appropriately decided. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a diagram illustrating an example of an RRC information element related to a PL-RS of Rel. 15.

[0016] Figure 2 is a diagram illustrating an example of an RRC information element related to a PL-RS of Rel. 16.

[0017] Figure 3 is a diagram illustrating an example of a UE operation according to the first embodiment.

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

[0019] Figure 5 is a diagram illustrating an example of a structure of a base station according to an embodiment.

[0020] Figure 6 Fig. 1 is a diagram showing an example of a structure of a user terminal according to an embodiment.

[0021] Figure 7 Fig. 2 is a diagram showing an example of a hardware structure of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0022] (TCI, spatial relation, QCL)

[0023] In NR, it is under study to control at least one of reception processing (e.g., at least one of reception, demapping, demodulation, decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, coding) in a UE of a signal / channel based on a Transmission Configuration Indication state (TCI state) being set.

[0024] A TCI state can also mean a state applied to a signal / channel of a downlink. A state equivalent to a TCI state applied to a signal / channel of an uplink can also be expressed as a spatial relation.

[0025] A TCI state refers to information related to Quasi-Co-Location (QCL) of a signal / channel, and can also be referred to as a spatial reception parameter, spatial relation information, etc. A TCI state can also be set to a UE per channel or per signal.

[0026] QCL is an index indicating a statistical property of a signal / channel. For example, a case where a certain signal / channel and another signal / channel are QCL can also mean that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, a spatial parameter (e.g., a spatial Rx parameter) can be assumed to be the same among the different plurality of signals / channels (QCL with respect to the at least one).

[0027] In addition, the spatial reception parameter can also correspond to a receive beam (e.g., a receive analog beam) of the UE, and can also be determined based on a spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure can also be replaced by sQCL (spatial QCL).

[0028] The QCL can also be defined in multiple types (QCL types). For example, four QCL types A-D that can assume different parameters (or sets of parameters) to be the same can also be provided, and the parameters (which can also be referred to as QCL parameters) are represented as follows:

[0029] • QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0030] • QCL Type B (QCL-B): Doppler shift and Doppler spread,

[0031] • QCL Type C (QCL-C): Doppler shift and average delay,

[0032] • QCL Type D (QCL-D): Spatial reception parameter.

[0033] The UE can also assume that a certain control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a specific QCL (e.g., QCL Type D) relationship with another CORESET, channel, or reference signal, which can also be referred to as a QCL assumption.

[0034] The UE can also determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) of a signal / channel based on a TCI state or a QCL assumption of the signal / channel.

[0035] The TCI state can also be information related to a QCL between a channel (in other words, a reference signal (Reference Signal (RS)) for the channel) that is the object and another signal (e.g., another RS), for example. The TCI state can also be configured (indicated) through higher layer signaling, physical layer signaling, or a combination thereof.

[0036] The physical layer signaling can also be downlink control information (Downlink Control Information (DCI)), for example.

[0037] The channel to which the TCI state or the spatial relation is configured (indicated) may, for example, also be at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0038] Furthermore, the RS to which the channel is in a QCL relationship may, for example, also be at least one of a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a reference signal for measurement (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also referred to as a Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also referred to as a QRS).

[0039] The SSB is a signal block containing at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB can also be referred to as an SS / PBCH block.

[0040] The RS of the QCL Type X of the TCI state can also mean a RS in a QCL Type X relationship with (the DMRS of) a certain channel / signal, which can also be referred to as a QCL source of the QCL Type X of the TCI state.

[0041] (Path loss RS)

[0042] Path loss PL in the transmission power control of each of the PUSCH, the PUCCH, and the SRS b，f，c (q d)[dB] index q of a reference signal (RS, path loss reference RS (PathlossReferenceRS)) using a downlink BWP associated with an activated UL BWP b of a carrier f of a serving cell c d and calculated by the UE. In the present disclosure, path loss reference RS, path loss (PL)-RS, index q d , RS used in path loss calculation, RS resource used in path loss calculation can be replaced with each other. In the present disclosure, calculation, estimation, measurement, track can be replaced with each other.

[0043] Under study: whether to change the existing mechanism of higher layer filtered RSRP (higher layer filtered RSRP) for path loss measurement in the case where the path loss RS is updated by MAC CE.

[0044] In the case where the path loss RS is updated by MAC CE, L1-RSRP based path loss measurement can also be applied. The higher layer filtered RSRP can be used for path loss measurement at the available timing after the MAC CE for updating the path loss RS, L1-RSRP is used for path loss measurement before the higher layer filtered RSRP is applied. The higher layer filtered RSRP can be used for path loss measurement at the available timing after the MAC CE for updating the path loss RS, the higher layer filtered RSRP using the previous path loss RS before that timing. The higher layer filtered RSRP is used for path loss measurement as well as the operation of Rel. 15, the UE can also track (track) all path loss RS candidates set by RRC. The maximum number of path loss RSs that can be set by RRC can also depend on the UE capability. In the case where the maximum number of path loss RSs that can be set by RRC is X, path loss RS candidates below X can also be set by RRC, and the path loss RS is selected from the set path loss RS candidates by MAC CE. The maximum number of path loss RSs that can be set by RRC can also be 4, 8, 16, 64, etc.

[0045] In the present disclosure, higher layer filtered RSRP, filtered RSRP, layer 3 filtered RSRP (layer 3 filtered RSRP) can be replaced with each other.

[0046] (Default TCI state / default spatial relation / default PL-RS)

[0047] In the RRC connected mode, in both cases where the TCI information within DCI (higher layer parameter TCI-PresentInDCI) is set to "valid (enabled)" and where the TCI information within DCI is not set, in the case where the time offset between the reception of the DL DCI (DCI scheduling PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than the threshold (timeDurationForQCL) (application condition, first condition), if in the case of non-cross carrier scheduling, the TCI state (default TCI state) of the PDSCH can also be the TCI state of the lowest CORESET ID in the latest slot within the active DL BWP of the (specific UL signal) CC. In the case that is not such, the TCI state (default TCI state) of the PDSCH can also be the TCI state of the lowest TCI state ID of the PDSCH within the active DL BWP of the scheduled CC.

[0048] In Rel. 15, each MAC CE for the activation / deactivation of the PUCCH spatial relation and the activation / deactivation of the SRS spatial relation is required. The PUSCH spatial relation follows the SRS spatial relation.

[0049] In Rel. 16, at least one of the MAC CE for the activation / deactivation of the PUCCH spatial relation and the activation / deactivation of the SRS spatial relation can not be used.

[0050] If in the case where both the spatial relation and the PL-RS for the PUCCH are not set in FR2 (application condition, second condition), the default assumption of the spatial relation and the PL-RS for the PUCCH is applied. If in the case where both the spatial relation and the PL-RS for the SRS (SRS resource for the SRS, or SRS resource corresponding to the SRI within the DCI format 0_1 scheduling PUSCH) are not set in FR2 (application condition, second condition), the default assumption of the spatial relation and the PL-RS for the PUSCH and the SRS scheduled by the DCI format 0_1 is applied.

[0051] In case a CORESET is configured within the active DL BWP on the CC, the default spatial relation and the default PL-RS can also be the TCI state or the QCL assumption of the CORESET with the lowest CORESET ID within the active DL BWP on the CC. In case no CORESET is configured within the active DL BWP on the CC, the default spatial relation and the default PL-RS can also be the active TCI state with the lowest ID of PDSCH within the active DL BWP on the CC.

[0052] In Rel. 15, the spatial relation of PUSCH scheduled by DCI format 0_0 follows the spatial relation of the PUCCH resource with the lowest PUCCH resource ID in the active spatial relation of PUCCH on the same CC. Even in case no PUCCH is transmitted on an SCell, the network needs to update the PUCCH spatial relation on all SCells.

[0053] In Rel. 16, no PUCCH configuration is needed for PUSCH scheduled by DCI format 0_0. In case no PUCCH spatial relation is activated or no PUCCH resource is configured on the active UL BWP within the CC (application condition, second condition) for PUSCH scheduled by DCI format 0_0, the default spatial relation and the default PL-RS are applied in the PUSCH.

[0054] The above threshold can also be referred to as QCL time length (time duration), “timeDurationForQCL”, “Threshold”, “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI”, “Threshold-Sched-Offset”, scheduling offset threshold, scheduling (scheduling) offset threshold, etc.

[0055] (PUSCH transmission power control)

[0056] In a case where one or more values of an ID of a path loss reference RS are provided to a UE, the UE can also derive a mapping between a set of values of an SRI field in a DCI format 0_1 and a set of values of an ID of a path loss reference RS from higher layer signaling (e.g., sri-PUSCH-PowerControl-Id within SRI-PUSCH-PowerControl). The UE can also determine a RS resource index q from an ID of a path loss reference RS mapped to a value of an SRI field in a DCI format 0_1 scheduling a PUSCH d .

[0057] As shown in Figure 1 , in Rel. 15, for PUSCH, a PL-RS (PUSCH-PathlossReferenceRS) containing a PL-RS ID (PUSCH-PathlossReferenceRS-Id) and an RS is configured by an RRC parameter.

[0058] If a UE calculates a PL using a reference signal (RS) resource from a SS / PBCH block used by the UE to obtain a Master Information Block (MIB) in a case where the UE is not provided with a path loss reference RS (PUSCH-PathlossReferenceRS) for PUSCH, or before the UE is provided with a dedicated higher layer parameter b，f，c (q d ).

[0059] The PL b，f，c (q d ) calculated by the UE is, for example, an index q of an RS (path loss reference RS, PL-RS) associated with an active UL BWP b of a carrier f of a serving cell c d , a path loss [dB] of a downlink BWP.

[0060] If PUSCH transmission is scheduled by DCI format 0_0, and the UE is not provided with spatial setting for PUSCH transmission, or if PUSCH transmission is scheduled by DCI format 0_1 which does not contain SRI field, or if SRI-PUSCH power control information (SRI-PUSCH-PowerControl) is not provided to the UE, the UE determines RS resource index q with each PUSCH pathloss reference RS ID (PUSCH-PathlossReferenceRS-Id) equal to zero d Here, the RS resource is located on any one of serving cell c and the serving cell indicated by the value of pathlossReferenceLinkng provided, if any.

[0061] In Rel. 16, as shown in Figure 2 For the PL-RS of PUSCH, a list of PL-RSs (pathlossReferenceRSToAddModList-r16) is configured by RRC parameter, and the PL-RSs within the list are activated by MAC CE.

[0062] For PUSCH scheduled by DCI format 0_1, in the case of any one of the configuration of spatial relation of SRS resource associated with SRI and PL-RS, the default spatial relation is applied to the PUSCH. However, there is no means to match the PL-RS of PUSCH with the default spatial relation. In all other cases (PUCCH, SRS, PUSCH scheduled by DCI format 0_0), if considering the default spatial relation is designed to match the default PL-RS, it is preferred that the default spatial relation and the default PL-RS are matched for PUSCH scheduled by DCI format 0_1.

[0063] Therefore, the inventors of the present application conceived a method for determining RS used in path loss calculation of PUSCH scheduled by DCI format 0_1.

[0064] In the present disclosure, “A / B”, “at least one of A and B” can also be replaced with each other.

[0065] In the present disclosure, index, ID, indicator, resource ID, etc. can also be replaced with each other.

[0066] In the present disclosure, cell, CC, carrier, BWP, activated DL BWP, activated UL BWP, frequency band can also be replaced with each other. In the present disclosure, RRC parameter, higher layer parameter, RRC information element (IE), RRC message can also be replaced with each other.

[0067] In the present disclosure, activation, update, indication, setting can also be replaced with each other.

[0068] In the present disclosure, DCI format 0_0, DCI not containing SRI, DCI not containing indication of spatial relation, DCI not containing CIF can also be replaced with each other. In the present disclosure, DCI format 0_1, DCI containing SRI, DCI containing indication of spatial relation, DCI containing CIF can also be replaced with each other.

[0069] In the present disclosure, path loss reference signal, path loss reference RS, PL-RS, PL-RS ID, RS resource index q d used in path loss calculation can also be replaced with each other. In the present disclosure, path loss reference signal of Release 15 (Rel. 15), PL-RS of which the maximum number set (maxNrofPUSCH-PathlossReferenceRSs) is 4, PUSCH-PathlossReferenceRS can also be replaced with each other. In the present disclosure, path loss reference signal of Release 16 (Rel. 16), PL-RS of which the maximum number set (maxNrofPUSCH-PathlossReferenceRSs-r16) is 64, PUSCH-PathlossReferenceRS-r16 can also be replaced with each other. In the present disclosure, path loss reference signal ID of Release 15, PL-RS ID of which the value ranges from 0 to 3 (maxNrofPUSCH-PathlossReferenceRSs-1), PUSCH-PathlossReferenceRS-Id can also be replaced with each other. In the present disclosure, path loss reference signal ID of Release 16, PL-RS ID of which the value ranges from 0 to 63 (maxNrofPUSCH-PathlossReferenceRSs-1-r16), PUSCH-PathlossReferenceRS-Id-r16 can also be replaced with each other. In the present disclosure, SRI-PUSCH power control information of Release 15, PUSCH-PowerControl can also be replaced with each other. In the present disclosure, SRI-PUSCH power control information of Release 16, PUSCH-PowerControl-v16xy, PUSCH-PowerControl-r16 can also be replaced with each other.

[0070] (Wireless communication method)

[0071] If the UE is provided with the default beam path loss activation information (e.g., SRS with default beam path loss activation information, enableDefaultBeamPlForSRS) and not provided with the PL-RS for PUSCH, the PL-RS (RS resource index q d for PUSCH scheduled by DCI format 0_1) can also be decided by the PL-RS of the SRS resource associated with the SRI and having the usage of codebook transmission (codebook, CB) or non-codebook transmission (nonCodebook, NCB).

[0072] <First Embodiment>

[0073] The UE can also decide the RS used in the path loss calculation for PUSCH according to the procedure 1 or 2.

[0074] <Procedure 1>

[0075] The UE can also determine whether the PL-RS for PUSCH is not provided based on whether the PL-RS ID for PUSCH is provided.

[0076] The UE can also follow at least one of the following procedures 1-1 and 1-2.

[0077] [Procedure 1-1]

[0078] In the case where the UE is provided with the SRI-PUSCH power control information (SRI-PUSCH-PowerControl) and the value of more than one of the PUSCH-PathlossReferenceRS-Id, the UE obtains the mapping between the set of values of the SRI field in the DCI format scheduling the PUSCH transmission and the set of values of the PUSCH-PathlossReferenceRS-Id according to the sri-PUSCH-PowerControlId within the SRI-PUSCH power control information, and decides the RS resource index q d Here, the RS resource is located on any one of the serving cell c and the serving cell indicated by the value of the pathlossReferenceLinkng provided.

[0079] [Procedure 1-2]

[0080] In case that PUSCH transmission is scheduled by DCI format 0_1, and the UE is provided with default beam pathloss activation information (e.g., SRS with default beam pathloss activation information), and the UE is not provided with PUSCH with PL-RS ID, and in case that the UE is not provided with Rel. 16 PUSCH with PL-RS ID (PUSCH-PathlossReferenceRS-Id-r16), the UE uses the same RS resource index q d .

[0081] Process 2

[0082] The UE can also determine whether not provided with PUSCH with PL-RS based on whether provided with PUSCH with PL-RS.

[0083] The UE can also follow at least one of the above Process 1-1 and the following Process 2-2.

[0084] [Process 2-2]

[0085] In case that PUSCH transmission is scheduled by DCI format 0_1, and the UE is provided with default beam pathloss activation information (e.g., SRS with default beam pathloss activation information, enableDefaultBeamPlForSRS), and the UE is not provided with PUSCH with PL-RS (PUSCH-PathlossReferenceRS), and in case that the UE is not provided with Rel. 16 PUSCH with PL-RS (PUSCH-PathlossReferenceRS-r16), the UE uses the same RS resource index q d .

[0086] Figure 3 is a figure showing an example of operation in case that PUSCH transmission is scheduled by DCI format 0_1, and the UE is provided with default beam pathloss activation information.

[0087] In a case where the UE is configured with at least one of the PL-RS ID for PUSCH (or the PL-RS for PUSCH) and the Rel. 16 PL-RS ID for PUSCH (or the Rel. 16 PL-RS for PUSCH) (S110: Yes), the configured ID can also be used for path loss calculation for PUSCH (S120). In a case where the UE is not configured with both the PL-RS ID for PUSCH and the Rel. 16 PL-RS ID for PUSCH (S110: No), the PL-RS of the SRS resource corresponding to the SRI for PUSCH can also be used for path loss calculation for PUSCH (S130). The SRS resource can also be the default spatial relation / default PL-RS.

[0088]

[0089] The condition of the process 1-2 can also be the following condition.

[0090] [Condition] In a case where PUSCH transmission is scheduled by DCI format 0_1, and the UE is provided with the default beam path loss activation information (e.g., SRS with default beam path loss activation information), and the UE is not provided with the PL-RS ID for PUSCH (PUSCH-PathlossReferenceRS-Id), and the UE is provided with the Rel. 16 PL-RS ID for PUSCH (PUSCH-PathlossReferenceRS-Id-r16), and the Rel. 16 PL-RS ID for PUSCH is not activated (by MAC CE).

[0091] The condition of the process 2-2 can also be the following condition.

[0092] [Condition] In a case where PUSCH transmission is scheduled by DCI format 0_1, and the UE is provided with the default beam path loss activation information (e.g., SRS with default beam path loss activation information), and the UE is not provided with the PL-RS for PUSCH (PUSCH-PathlossReferenceRS), and the UE is provided with the Rel. 16 PL-RS for PUSCH (PUSCH-PathlossReferenceRS-r16), and the Rel. 16 PL-RS for PUSCH is not activated (by MAC CE).

[0093]

[0094] The condition of the process 1-2 or 2-2 can also be the following condition.

[0095] ​​[Condition] PUSCH transmission is scheduled by DCI format 0_1, and the UE is provided with default beam path loss activation information (e.g., SRS with default beam path loss activation information), and the UE is not provided with SRI-PUSCH power control information (SRI-PUSCH-PowerControl), and the UE is not provided with Rel. 16 SRI-PUSCH power control information (SRI-PUSCH-PowerControl-r16, PUSCH-PowerControl-v16xy).

[0096] [Modified example 3]

[0097] The default beam path loss activation information in the process 1-2 or 2-2 can also be at least one of SRS with default beam path loss activation information, information that activates a default PL-RS for PUSCH scheduled by DCI format 0_1 (e.g., enableDefaultPlForPUSCH0_1), and information that activates a default spatial relation and a default PL-RS for PUSCH scheduled by DCI format 0_1 (e.g., enableDefaultBeamPlForPUSCH0_1).

[0098] According to the above first embodiment, even in a case where a PL-RS for PUSCH is not set, it is possible to appropriately determine an RS for path loss calculation of PUSCH.

[0099] (Wireless communication system)

[0100] Hereinafter, a structure of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0101] Figure 4 is a diagram illustrating an example of a schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0102] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Radio Access Technology (RAT)) (Multi-RAT Dual Connectivity (MR-DC)). The MR-DC can also include dual connectivity of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0103] In EN-DC, the base station of LTE (E-UTRA) (eNB) is a master node (MN), and the base station of NR (gNB) is a secondary node (SN). In NE-DC, the base station of NR (gNB) is an MN, and the base station of LTE (E-UTRA) (eNB) is an SN.

[0104] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity of both MN and SN being base stations of NR (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0105] The wireless communication system 1 can also have a base station 11 that forms a macro cell C1 with a wide coverage, and base stations 12 (12a-12c) that are configured within the macro cell C1 and form small cells C2 that are narrower than the macro cell C1. The user terminal 20 can also be located within at least one cell. The configuration, number, and the like of the cells and the user terminal 20 are not limited to the manner shown in the drawing. Hereinafter, without distinguishing between the base stations 11 and 12, the base stations 10 are collectively referred to as base stations 10.

[0106] The user terminal 20 can also be connected to at least one of the multiple base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0107] Each of the CCs can also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell Cl can also be included in the FR1, and the small cell C2 can also be included in the FR2. For example, the FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and the FR2 can also be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited to these, and for example, the FR1 can also correspond to a frequency band higher than the FR2.

[0108] Furthermore, the user terminal 20 can also communicate in each of the CCs using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0109] The plurality of base stations 10 can also be connected through wired (for example, optical fiber based on Common Public Radio Interface (CPRI), X2 interface, or the like) or wireless (for example, NR communication). For example, when NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 corresponding to a higher station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) can also be referred to as an IAB node.

[0110] The base station 10 can also be connected to a core network 30 via another base station 10 or directly. The core network 30 can also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), or the like, for example.

[0111] The user terminal 20 can also be a terminal that supports at least one of LTE, LTE-A, 5G, or the like.

[0112] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of Downlink (DL) and Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), and the like can also be used.

[0113] The wireless access scheme can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access schemes (for example, other single carrier transmission schemes, other multicarrier transmission schemes) can also be used in the wireless access schemes of UL and DL.

[0114] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared among the user terminals 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and the like can also be used.

[0115] Furthermore, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared among the user terminals 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like can also be used.

[0116] User data, higher layer control information, a system information block (SIB), and the like are transmitted through a PDSCH. User data, higher layer control information, and the like can also be transmitted through a PUSCH. Further, a master information block (MIB) can also be transmitted through a PBCH.

[0117] Lower layer control information can also be transmitted through a PDCCH. The lower layer control information may, for example, also include downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of a PDSCH and a PUSCH.

[0118] In addition, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, or the like, and the DCI that schedules the PUSCH can also be referred to as a UL grant, a UL DCI, or the like. In addition, the PDSCH can also be replaced with DL data, and the PUSCH can also be replaced with UL data.

[0119] In the detection of the PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area and a search method of the PDCCH candidates. One CORESET can also be associated with one or a plurality of search spaces. The UE can monitor the CORESET associated with a certain search space based on a search space setting.

[0120] One search space can also correspond to the PDCCH candidates equivalent to one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", and the like of the present disclosure can also be replaced with each other.

[0121] Uplink Control Information (UCI) including at least one of Channel State Information (CSI), delivery acknowledgement information (for example, also referred to as Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK), ACK / NACK, and the like), and a Scheduling Request (SR) can also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through the PRACH.

[0122] In addition, in the present disclosure, downlink, uplink, and the like can also be described without "link". Furthermore, "Physical" can also be described without being attached to the beginning of various channels.

[0123] In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like can also be transmitted. As the DL-RS, 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), and the like can also be transmitted in the wireless communication system 1.

[0124] The synchronization signal can be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SSB), and the like. In addition, the SS, the SSB, and the like can also be referred to as a reference signal.

[0125] Furthermore, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), and the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0126] (Base station)

[0127] Figure 5 is a diagram illustrating an example of a structure of a base station according to an embodiment. The base station 10 is provided with a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmission / reception unit 120, and the transmission / reception antenna 130, and the transmission path interface 140 can each be provided with one or more.

[0128] In addition, in this example, mainly functional blocks of the characteristic part in the present embodiment are illustrated, and it can also be assumed that the base station 10 has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0129] The control unit 110 implements control of the entire base station 10. The control unit 110 can be constituted by a controller, a control circuit, or the like based on common knowledge in the technical field to which the present disclosure pertains.

[0130] The control unit 110 can also control generation, scheduling (for example, resource allocation, mapping), and the like of a signal. The control unit 110 can also control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, a sequence, and the like transmitted as a signal, and forward to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0131] The transmission / reception unit 120 can also include a baseband unit 121, a radio frequency (RF) unit 122, a measurement unit 123. The baseband unit 121 can also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0132] The transmission / reception unit 120 can be constituted as an integrated transmission / reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 1211 and the RF unit 122. The reception unit can be constituted by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0133] The transmission / reception antenna 130 can be constituted by an antenna, for example, an array antenna, and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0134] The transmission / reception unit 120 can also transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 120 can also receive the uplink channel, the uplink reference signal, and the like described above.

[0135] The transmission / reception unit 120 can use digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like, to form at least one of a transmission beam and a reception beam.

[0136] The transmission / reception unit 120 (transmission processing unit 1211) can also generate a bit string to be transmitted, for example, by performing processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 110.

[0137] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which can include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-analog conversion, and the like on a bit string to be transmitted, and output a baseband signal.

[0138] The transmission / reception unit 120 (RF unit 122) can also perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and transmit a signal of the radio frequency band via the transmission / reception antenna 130.

[0139] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to a baseband signal, and the like on a signal of the radio frequency band received by the transmission / reception antenna 130.

[0140] The transmission / reception unit 120 (reception processing unit 1212) can also apply reception processing such as analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as necessary), filter processing, demapping, demodulation, decoding (which can include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like to the baseband signal acquired, and acquire user data and the like.

[0141] The transmission / reception unit 120 (measurement unit 123) can also perform measurements related to a received signal. For example, the measurement unit 123 can also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, and the like, based on a received signal. The measurement unit 123 can also perform measurements with respect to 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), and the like. Measurement results can also be output to the control unit 110.

[0142] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, and the like, and can also acquire, transmit, and the like, user data (user plane data), control plane data, and the like, for the user terminal 20.

[0143] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0144] The transmission / reception unit 120 can also transmit downlink control information (DCI) that schedules a physical downlink shared channel (PUSCH). In a case where the DCI is DCI format 0_1, and activation information of a default path loss reference signal is provided, and a path loss reference signal is not set for the PUSCH or activated, the control unit 110 can control reception of the PUSCH that is transmitted based on path loss of a reference signal for a sounding reference signal (SRS) corresponding to the PUSCH.

[0145] (User terminal)

[0146] Figure 6is a diagram showing an example of a structure of a user terminal according to an embodiment. The user terminal 20 is provided with a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 can each be provided with one or more.

[0147] In addition, in this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it is also conceivable that the user terminal 20 has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0148] The control unit 210 implements control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0149] The control unit 210 can also control generation, mapping, and the like of a signal. The control unit 210 can also control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, a sequence, and the like transmitted as a signal, and forward them to the transmission / reception unit 220.

[0150] The transmission / reception unit 220 can include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can include a transmission processing unit 2211, a reception processing unit 2212. The transmission / reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0151] The transmission / reception unit 220 can be constituted as an integrated transmission / reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 2211 and the RF unit 222. The reception unit can be constituted by the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0152] The transmission / reception antenna 230 can be constituted by an antenna, for example, an array antenna, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0153] The transmission / reception unit 220 can receive the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 220 can transmit the uplink channel, the uplink reference signal, and the like described above.

[0154] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of a transmission beam and a reception beam.

[0155] The transmission / reception unit 220 (transmission processing unit 2211) can also perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), or the like, on data, control information, or the like acquired from the control unit 210, to generate a bit string to be transmitted.

[0156] The transmission / reception unit 220 (transmission processing unit 2211) can also perform channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, digital-analog conversion, or the like, on the bit string to be transmitted, to output a baseband signal.

[0157] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), in a case where transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-described transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and in a case where this is not so, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-described transmission processing.

[0158] The transmission / reception unit 220 (RF unit 222) can also perform modulation to a radio frequency band, filter processing, amplification, or the like, on the baseband signal, to transmit a signal of the radio frequency band via the transmission / reception antenna 230.

[0159] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, or the like, on a signal of the radio frequency band received by the transmission / reception antenna 230.

[0160] The transmission / reception unit 220 (reception processing unit 2212) can also apply analog-digital conversion, FFT processing, IDFT processing (as necessary), filter processing, demapping, demodulation, decoding (which can include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, or the like, on the acquired baseband signal, to acquire user data or the like.

[0161] The transmission / reception unit 220 (measurement unit 223) can also perform a measurement related to a received signal. For example, the measurement unit 223 can also perform an RRM measurement, a CSI measurement, and the like, based on a received signal. The measurement unit 223 can also perform a measurement with respect to a received power (for example, RSRP), a received quality (for example, RSRQ, SINR, SNR), a signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result can also be output to the control unit 210.

[0162] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220, the transmission / reception antenna 230, and the transmission path interface 240.

[0163] The transmission / reception unit 220 can also receive downlink control information (DCI) that schedules a physical downlink shared channel (PUSCH). In a case where the DCI is DCI format 0_1, and activation information of a default path loss reference signal is provided, and a path loss reference signal that is set for the PUSCH or activated is not provided, the control unit 210 can use a reference signal for a sounding reference signal (SRS) corresponding to the PUSCH for path loss calculation.

[0164] In a case where a path loss reference signal ID or a path loss reference signal or a SRS resource indicator (SRI)-PUSCH power control information of a version 15 is not set, and both a path loss reference signal ID or a path loss reference signal or a SRI-PUSCH power control information of a version 16 are not set, the control unit 210 can determine that a path loss reference signal for the PUSCH is not set.

[0165] In a case where a path loss reference signal of a version 15 is not set, a path loss reference signal of a version 16 is set, and the path loss reference signal of the version 16 is not activated, the control unit 210 can determine that a path loss reference signal for the PUSCH is not set.

[0166] The activation information can be at least one of information that activates a default path loss reference signal for an SRS and information that activates a default path loss reference signal for a PUSCH scheduled by DCI format 0_1.

[0167] (Hardware structure)

[0168] Further, the block diagrams used in the description of the embodiments above show blocks of functional units. These functional blocks (structural units) are realized by any combination of hardware and software, and the method of realizing the functional blocks is not particularly limited. That is, each functional block can be realized by one device physically or logically integrated, or by two or more devices directly or indirectly (for example, by wire, wireless, or the like) connected. The functional blocks can also be realized by combining the above one device or the above plurality of devices with software.

[0169] Here, among the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that realizes a transmission function can also be referred to as a transmitting unit, a transmitter, or the like. Any one of these is as described above, and the method of realization is not particularly limited.

[0170] For example, the base station, the user terminal, and the like in an embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 is a diagram showing an example of a hardware structure of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0171] Further, in the present disclosure, the terms of device, circuit, equipment, section, unit, and the like can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or a plurality of each device shown in the diagram, or can be configured not to include a part of the devices.

[0172] For example, the processor 1001 is only illustrated one, but there can be a plurality of processors. Further, the processing can be executed by one processor, or the processing can be executed by two or more processors simultaneously, sequentially, or with other methods. In addition, the processor 1001 can be realized by one or more chips.

[0173] As for each function in the base station 10 and the user terminal 20, at least one of the operation by the processor 1001 and the control of the communication via the communication device 1004, or the control of the readout and the writing of the data in the memory 1002 and the storage 1003 is realized, for example, by reading a specific software (program) into the processor 1001, the memory 1002, or the like hardware, and thereby performing the operation and the control by the processor 1001.

[0174] The processor 1001 causes, for example, an operating system to operate to control the entire computer. The processor 1001 can also be constituted by a central processing device (Central Processing Unit (CPU)) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, at least a part of the above-described control unit 110 (210), the transmission and reception unit 120 (220), and the like can also be realized by the processor 1001.

[0175] Further, the processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processing according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) can also be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be applied to other functional blocks.

[0176] The memory 1002 can also be a computer-readable recording medium, for example, constituted by at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other appropriate storage medium. The memory 1002 can also be referred to as a register, a cache, a main storage (main storage device), and the like. The memory 1002 can hold a program (program code), a software module, and the like that can be executed in order to implement the wireless communication method related to one embodiment of the present disclosure.

[0177] The storage 1003 can also be a computer-readable recording medium such as at least one of a flexible disc, a floppy (registered trademark) disc, a magneto-optical disc (e.g., a compact disc read-only memory (CD-ROM) and the like), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disc, a hard disc drive, an intelligent disk (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and another appropriate recording medium. The storage 1003 can also be referred to as an auxiliary storage device.

[0178] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, also referred to as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The above-described transceiver 120 (220), a transceiver antenna 130 (230), and the like can also be implemented by the communication device 1004. The transceiver 120 (220) can also be implemented by a transmission unit 120a (220a) and a reception unit 120b (220b) in a physically or logically separated manner.

[0179] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, and the like) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (e.g., a touch panel).

[0180] Furthermore, the processor 1001, the memory 1002, and the like are connected through a bus 1007 for communicating information. The bus 1007 can be configured with a single bus, or can be configured with different buses between the devices.

[0181] Furthermore, the base station 10 and the user terminal 20 can also be configured to include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), and the like hardware, and a part or all of the functional blocks can also be implemented using the hardware. For example, the processor 1001 can also be implemented using at least one of these hardware.

[0182] (Modified example)

[0183] In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure can also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (a signal or signaling) can also be replaced with each other. In addition, a signal can also be a message. A reference signal (RS) can also be simply referred to as RS, and can also be referred to as a pilot, a pilot signal, and the like depending on the applied standard. In addition, a component carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, and the like.

[0184] A radio frame can also be configured by one or a plurality of periods (frames) in the time domain. Each period (frame) configuring the radio frame can also be referred to as a subframe. Further, a subframe can also be configured by one or a plurality of slots in the time domain. A subframe can also be a fixed time length (for example, 1 ms) independent of numerology.

[0185] Here, numerology can also refer to a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, numerology can also indicate at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering processing performed by a transmitter-receiver in the frequency domain, a specific windowing processing performed by the transmitter-receiver in the time domain, and the like.

[0186] A slot can also be composed of one or a plurality of symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a slot can also be a time unit based on a numerology.

[0187] A slot can also include a plurality of mini-slots. Each mini-slot can also be composed of one or a plurality of symbols in the time domain. In addition, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0188] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit for transmitting a signal. A radio frame, a subframe, a slot, a mini-slot, and a symbol can also be referred to by other names respectively corresponding thereto. In addition, a time unit of a frame, a subframe, a slot, a mini-slot, a symbol, etc. in the present disclosure can also be replaced with each other.

[0189] For example, one subframe can also be referred to as a TTI, a plurality of consecutive subframes can also be referred to as a TTI, one slot or one mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. In addition, a unit representing a TTI can also not be referred to as a subframe, but can be referred to as a slot, a mini-slot, etc.

[0190] Here, a TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling in which a radio resource (a frequency bandwidth, a transmission power, etc. that can be used in each user terminal) is allocated to each user terminal in a TTI unit. In addition, the definition of a TTI is not limited thereto.

[0191] A TTI can also be a transmission time unit of a data packet (a transport block), a code block, a codeword, etc. that has been channel-encoded, and can also become a processing unit of scheduling, link adaptation, etc. In addition, when a TTI is given, a time interval (for example, a number of symbols) to which a transport block, a code block, a codeword, etc. are actually mapped can also be shorter than the TTI.

[0192] In addition, in a case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) can also be a minimum time unit of scheduling. In addition, the number of slots (mini-slots) constituting the minimum time unit of scheduling can also be controlled.

[0193] A TTI having a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0194] In addition, the long TTI (e.g., normal TTI, subframe, etc.) can also be replaced with a TTI having a time length of more than 1 ms, and the short TTI (e.g., shortened TTI, etc.) can also be replaced with a TTI having a TTI length shorter than the long TTI and a TTI length of 1 ms or more.

[0195] A resource block (RB) is a resource allocation unit in a time domain and a frequency domain, and can also include one or more contiguous subcarriers in the frequency domain. The number of subcarriers included in the RB can also be the same regardless of numerologies, for example, can also be 12. The number of subcarriers included in the RB can also be determined based on numerologies.

[0196] In addition, the RB can also include one or more symbols in the time domain, and can also be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be constituted by one or more resource blocks, respectively.

[0197] In addition, one or more RBs can also be referred to as a physical RB (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0198] In addition, a resource block can also be constituted by one or more resource elements (REs). For example, one RE can also be a wireless resource area of one subcarrier and one symbol.

[0199] A bandwidth part (BWP) (may also be referred to as a partial bandwidth, etc.) can also indicate a subset of contiguous common RBs (common resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can also be determined by indices of the RBs with reference to a common reference point of the carrier. The PRBs can also be defined in a certain BWP and additionally numbered within the BWP.

[0200] The BWP can also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs can also be configured within one carrier.

[0201] At least one of the configured BWPs can also be activated, and the UE can not be assumed to transmit / receive a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", etc. in the disclosure can also be replaced with "BWP".

[0202] In addition, the above-described structures of the radio frame, the subframe, the slot, the mini-slot, and the symbol, etc. are merely illustrative. For example, the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in the slot, the symbols included in the slot or the mini-slot, the number of RBs, the number of subcarriers included in the RB, and the number of symbols, the symbol length, the Cyclic Prefix (CP) length, etc. within the TTI can be variously changed.

[0203] Further, the information, the parameters, etc. explained in the disclosure can be expressed by absolute values, can be expressed by relative values with respect to specific values, and can also be expressed by corresponding other information. For example, the radio resources can also be indicated by specific indices.

[0204] In the disclosure, the names used for the parameters, etc. are not names in all aspects. Further, the mathematical expressions, etc. using these parameters can also be different from those explicitly disclosed in the disclosure. The various channels (PUCCH, PDCCH, etc.) and the information elements can be identified by any appropriate names, and thus the various names assigned to the various channels and the information elements are not names in all aspects.

[0205] Information, signals, and so on in the present disclosure can be represented using any of a wide variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and so on that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0206] Further, information, signals, and so on can be outputted in at least one direction of a high layer to a low layer, and a low layer to a high layer. Information, signals, and so on can be inputted and outputted via a plurality of network nodes.

[0207] Information, signals, and so on inputted and outputted can be saved in a specific location (for example, a memory), and can be managed using a management table. Information, signals, and so on inputted and outputted can be overwritten, updated, or appended. Information, signals, and so on outputted can be deleted. Information, signals, and so on inputted can be transmitted to other devices.

[0208] The notification of information is not limited to the manners / embodiments described in the present disclosure, and can be performed using other methods. For example, the notification of information in the present disclosure can also be implemented through physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (for example, Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), and so on), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0209] In addition, the physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Furthermore, the RRC signaling can also be referred to as an RRC message, for example, can also be an RRC connection setup message, an RRC connection reconfiguration message, and the like. Furthermore, the MAC signaling can also be notified using a MAC control element (CE), for example.

[0210] Furthermore, the notification of the specific information (for example, the notification of "X is") is not limited to the explicit notification, but can also be performed implicitly (for example, by not performing the notification of the specific information, or by the notification of other information).

[0211] The determination can be performed by a value represented by one bit (0 or 1), can also be performed by a true / false value (Boolean value) represented by true or false, and can also be performed by a comparison of numerical values (for example, a comparison with a specific value).

[0212] Software, regardless of being referred to as software, firmware, middle-ware, microcode, hardware description language, or by other names, should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executables, execution threads, procedures, functions, and the like.

[0213] Moreover, software, instructions, information, etc. can also be transmitted as desired as a carrier wave. For example, in the case where software is transmitted from a website, a server, or other remote source using at least one of wired technologies (coaxial cables, optical fiber cables, twisted pair cables, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared rays, microwaves, etc.), at least one of these wired technologies and wireless technologies is included in the definition of the transmission medium.

[0214] The terms "system" and "network" used in the present disclosure can be used interchangeably. The "network" can also mean an apparatus (e.g., a base station) included in the network.

[0215] In the present disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0216] In the present disclosure, the terms "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. There is also a case where the base station is called with the terms macro cell, small cell, femto cell, pico cell, etc.

[0217] A base station can accommodate one or a plurality of (for example, three) cells. In a case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, each of which can also be provided with communication services by a base station subsystem (for example, a small-sized base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services within the coverage.

[0218] In the present disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", and the like can be used interchangeably.

[0219] There are also cases where a mobile station is called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or a number of other appropriate terms.

[0220] At least one of a base station and a mobile station can also be called a transmission device, a reception device, a wireless communication device, and the like. In addition, at least one of a base station and a mobile station can also be a device mounted on a mobile body, a mobile body itself, and the like. The mobile body can be a vehicle (for example, a car, an airplane, and the like), a mobile body that moves in a unmanned manner (for example, a drone, an automated driving vehicle, and the like), and a robot (manned or unmanned). In addition, at least one of a base station and a mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of a base station and a mobile station can also be a sensor and the like Internet of Things (IoT) device.

[0221] Furthermore, the base station in the present disclosure can also be replaced with a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, also referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), and the like), each of the modes / embodiments of the present disclosure can also be applied. In this case, a structure in which the user terminal 20 has the functions of the base station 10 described above can also be provided. Furthermore, the terms "uplink", "downlink", and the like can also be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, and the like can also be replaced with a side channel.

[0222] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, a structure in which the base station 10 has the functions of the user terminal 20 described above can also be provided.

[0223] In the present disclosure, an action performed by a base station is sometimes also performed by an upper node thereof depending on the situation. Obviously, in a network including one or a plurality of network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited to these), or a combination thereof.

[0224] Each of the modes / embodiments described in the present disclosure can be used individually, can be used in combination, and can also be used in switching as execution proceeds. Furthermore, the processing procedure, the sequence, the flowchart, and the like of each of the modes / embodiments described in the present disclosure can also be reversed in order as long as there is no contradiction. For example, for the method described in the present disclosure, elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0225] The modes / embodiments explained in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer, a 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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), a system using another appropriate wireless communication method, a next-generation system extended based thereon, and the like. Furthermore, a plurality of systems can also be combined (for example, LTE or LTE-A, in combination with 5G, and the like) and applied.

[0226] The recitation "based on" used in the present disclosure does not mean "only based on" unless specifically written. In other words, the recitation "based on" means both "only based on" and "at least based on".

[0227] Any reference to an element or steps in a claim that is comprised of more than one step, or refers to a function of said element or step, is not to be construed as an implicit disclosure of each and every possible combination of said element or step with another element or step, and / or another function of said element or step unless explicitly stated in the claims.

[0228] As used in the present disclosure, the term "determining" encompasses a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as looking up in a table, a database or another data structure), ascertaining and the like.

[0229] As used in the present disclosure, the term "determining" also encompasses receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory) and the like.

[0230] As used in the present disclosure, the term "determining" also encompasses resolving, selecting, choosing, establishing and the like.

[0231] As used in the present disclosure, the term "determining" can also be replaced by "assuming," "expecting," "considering" and the like.

[0232] The "maximum transmission power" according to the present disclosure can mean a maximum value of the transmission power, a nominal maximum transmission power (the nominal UE maximum transmit power), or a rated maximum transmission power (the rated UE maximum transmit power).

[0233] The terms "connected," "coupled," and all variations thereof, as used in the present disclosure, are intended to cover all of the following: a direct connection between two elements; an indirect connection between two elements; and a connection between two or more elements through one or more intermediate elements. The connection between the elements can be physical, logical, or a combination thereof. For example, "connected" can be replaced with "accessed."

[0234] In the present disclosure, in the case where two elements are connected, one or more wires, cables, printed electrical connections, and the like can be used, and electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, the light (both visible and invisible) region, and the like can be used as a number of non-limiting and non-inclusive examples, and the two elements can be "connected" or "coupled" to each other.

[0235] In the present disclosure, the term "A is different from B" can also mean "A and B are different from each other." In addition, the term can also mean "A and B are different from C, respectively." The terms "separated," "coupled," and the like can also be interpreted in the same manner as "different."

[0236] In the present disclosure, the terms "include," "including," and variations thereof, as used in the present disclosure, mean the same as the term "comprising." Furthermore, the term "or" used in the present disclosure does not mean the exclusive or.

[0237] In the present disclosure, for example, in the case where an article is added by translation, such as a, an, and the in English, the present disclosure can also include a case where a noun following the article is plural.

[0238] The application related to the present disclosure has been described in detail above, but it is apparent to those skilled in the art that the application related to the present disclosure is not limited to the embodiments described in the present disclosure. The application related to the present disclosure can be implemented as a modification and a change without departing from the gist and the scope of the application determined based on the recitations of the claims. Therefore, the recitations of the present disclosure are intended for the purpose of illustrative explanation, and do not have any limiting meaning on the application related to the present disclosure.

Claims

1. A terminal, having: a reception unit that receives downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH) and includes a sounding reference signal resource indicator (SRI); and a control unit that uses, for a calculation of a path loss for the PUSCH, a reference signal resource index based on the SRI, in a case where the terminal is provided with a first mapping from a plurality of values of the SRI to a plurality of first path loss reference signal IDs for the calculation, and a first parameter that is set by a radio resource control information element and indicates an association between the plurality of first path loss reference signal IDs and a plurality of first reference signal resource indexes, each of the plurality of first path loss reference signal IDs having a value of 0 to 3, the control unit decides a first path loss reference signal ID corresponding to the SRI based on the first mapping, and uses a first reference signal resource index corresponding to the first path loss reference signal ID for the calculation, in a case where the terminal is provided with a second mapping from a plurality of values of the SRI to a plurality of second path loss reference signal IDs for the calculation, and a second parameter that is set by a radio resource control information element and activated by a medium access control control element (MAC CE), and indicates an association between the plurality of second path loss reference signal IDs and a plurality of second reference signal resource indexes, each of the plurality of second path loss reference signal IDs having a value of 0 to 63, the control unit decides a second path loss reference signal ID corresponding to the SRI based on the second mapping, and uses a second reference signal resource index corresponding to the second path loss reference signal ID for the calculation, in a case where the terminal is provided with default beam activation information for a sounding reference signal (SRS) resource, and the terminal is not provided with either of the first parameter and the second parameter, the control unit uses, for a calculation of a path loss for the SRS resource corresponding to the SRI, a third reference signal resource index that is the same as a reference signal index for the calculation. 2.A wireless communication method, which is a wireless communication method of a terminal, having: a step of receiving downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH) and includes a sounding reference signal resource indicator (SRI); and a step of using, for a calculation of a path loss for the PUSCH, a reference signal resource index based on the SRI, ​ ​ ​ ​ ​ ​ ​ in a case where the terminal is provided with a first mapping from a plurality of values of the SRI to a plurality of first path loss reference signal IDs for the calculation, and a first parameter, the first parameter being set by a radio resource control information element and indicating an association between the plurality of first path loss reference signal IDs and a plurality of first reference signal resource indexes, each of the plurality of first path loss reference signal IDs having a value of 0 to 3, the terminal decides a first path loss reference signal ID corresponding to the SRI based on the first mapping, and uses a first reference signal resource index corresponding to the first path loss reference signal ID for the calculation, in a case where the terminal is provided with a second mapping from a plurality of values of the SRI to a plurality of second path loss reference signal IDs for the calculation, and a second parameter, the second parameter being set by a radio resource control information element and activated by a medium access control control element (MAC CE), and indicating an association between the plurality of second path loss reference signal IDs and a plurality of second reference signal resource indexes, each of the plurality of second path loss reference signal IDs having a value of 0 to 63, the terminal decides a second path loss reference signal ID corresponding to the SRI based on the second mapping, and uses a second reference signal resource index corresponding to the second path loss reference signal ID for the calculation, in a case where the terminal is provided with default beam activation information for a sounding reference signal (SRS) resource, and the terminal is not provided with either of the first parameter and the second parameter, the terminal uses a same reference signal index as a third reference signal resource index for a calculation of a path loss for an SRS resource corresponding to the SRI for the calculation.

3. A system having a terminal and a base station, the terminal having: a reception unit that receives downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH) and includes a sounding reference signal resource indicator (SRI); and a control unit that uses a reference signal resource index based on the SRI for a calculation of a path loss for the PUSCH, in a case where the terminal is provided with a first mapping from a plurality of values of the SRI to a plurality of first path loss reference signal IDs for the calculation, and a first parameter, the first parameter being set by a radio resource control information element and indicating an association between the plurality of first path loss reference signal IDs and a plurality of first reference signal resource indexes, each of the plurality of first path loss reference signal IDs having a value of 0 to 3, the control unit decides a first path loss reference signal ID corresponding to the SRI based on the first mapping, and uses a first reference signal resource index corresponding to the first path loss reference signal ID for the calculation, In a case where the terminal is provided with a second mapping from a plurality of values of the SRI to a plurality of second path loss reference signal IDs for the calculation, and a second parameter, the second parameter is set by a radio resource control information element and activated by a medium access control control element MAC CE, and represents an association between the plurality of second path loss reference signal IDs and a plurality of second reference signal resource indexes, each of the plurality of second path loss reference signal IDs having a value of 0 to 63, the control unit decides a second path loss reference signal ID corresponding to the SRI based on the second mapping, and uses a second reference signal resource index corresponding to the second path loss reference signal ID for the calculation, In a case where the terminal is provided with default beam activation information for sounding reference signal SRS resources, and the terminal is not provided with either of the first parameter and the second parameter, the control unit uses a reference signal index identical to a third reference signal resource index for a calculation of a path loss of an SRS resource corresponding to the SRI for the calculation, The base station transmits the DCI.

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