Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure includes: a receiving unit that receives a list including a plurality of path loss reference signals (PL-RSs); and a control unit that, when none of the plurality of PL-RSs is in an active state, controls the calculation of path loss for an uplink signal scheduled by DCI including an SRS resource identifier field using a specific PL-RS.

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 Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) (Non-Patent Document 1) has been standardized for the purpose of further high-speed data rates, low latency, etc. In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further large capacity, high performance, etc. compared to LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Subsequent systems of LTE are also discussed (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] In existing LTE (for example, 3GPP Rel. 8-14), a user terminal (User Equipment (UE)) transmits uplink control information (UCI) using at least one of a UL data channel (for example, a Physical Uplink Shared Channel (PUSCH)) and a UL control channel (for example, a Physical Uplink Control Channel (PUCCH)).

[0005] Prior Art Documents

[0006] Non-Patent Documents

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

[0008] Problems to be Solved by the Invention

[0009] In future wireless communication systems (e.g., NR), it is being studied that a user terminal (terminal, user terminal, User Equipment (UE)) uses a path loss reference signal (PL-RS) in the calculation of path loss for uplink (UL) transmission power control.

[0010] It is being studied that a network (e.g., a base station) sets multiple PL-RSs (or, PL-RS candidates) for a UE and designates a PL-RS to be activated from the multiple PL-RSs by using a MAC control element (MAC CE).

[0011] However, it is not clear which PL-RS the UE uses to control the calculation of path loss during the period when the PL-RS is activated by the MAC control element. When the PL-RS cannot be appropriately selected in the UE, UL transmission cannot be appropriately performed, and there is a risk of degradation of system performance such as a reduction in throughput.

[0012] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately control UL transmission using a path loss reference signal.

[0013] Means for Solving the Problems

[0014] A terminal according to one aspect of the present disclosure is characterized by including: a receiving unit that receives a list including a plurality of path loss reference signals (PL-RSs); and a control unit that, when none of the plurality of PL-RSs is in an active state, uses a specific PL-RS to control the calculation of path loss for an uplink signal scheduled by DCI including an SRS resource identifier field.

[0015] Advantages of the Invention

[0016] According to one aspect of the present disclosure, UL transmission using a path loss reference signal can be appropriately controlled. Brief Description of the Drawings

[0017] Figure 1 This is a diagram showing an example of an RRC information element related to PL-RS for Rel. 15.

[0018] Figure 2 This is a diagram showing an example of an RRC information element related to PL-RS for Rel. 16.

[0019] Figure 3 This is a diagram showing an example in the case of UL transmission before activation of PL-RS based on MAC CE.

[0020] Figure 4 This is a diagram showing an example of UL transmission control related to the first method.

[0021] Figure 5 This is a diagram showing an example of information related to power control of PUSCH based on SRI.

[0022] Figure 6 This is a diagram showing another example of information related to power control of PUSCH based on SRI.

[0023] Figure 7 This is a diagram showing an example of the schematic structure of a wireless communication system related to one embodiment.

[0024] Figure 8 This is a diagram showing an example of the structure of a base station related to one embodiment.

[0025] Figure 9 This is a diagram showing an example of the structure of a user terminal related to one embodiment.

[0026] Figure 10 This is a diagram showing an example of the hardware structure of a base station and a user terminal related to one embodiment. Detailed implementation mode

[0027] (TCI, spatial relationship, QCL)

[0028] In NR, research is being conducted on controlling the 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) of at least one of signals and channels (referred to as signal / channel) in a UE based on the Transmission Configuration Indication state (TCI state).

[0029] The TCI state can also represent elements of signals / channels for the downlink. Similar to the TCI state of signals / channels for the uplink, it can also be expressed as a spatial relation.

[0030] The TCI state refers to information related to the Quasi-Co-Location (QCL) of signals / channels, and can also be referred to as spatial reception parameters, Spatial Relation Information, etc. The TCI state can also be set for the UE on a per-channel or per-signal basis.

[0031] QCL is an indicator representing the statistical properties of signals / channels. For example, when a certain signal / channel is in a QCL relationship with other signals / channels, it can also mean that it can be assumed that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameter) is the same among these different multiple signals / channels (in QCL for at least one of these).

[0032] In addition, the spatial reception parameters can also correspond to the receiving beam of the UE (e.g., receiving analog beam), and the beam can also be determined based on spatial QCL. The QCL (or at least one element of QCL) in this disclosure can also be renamed as sQCL (spatial QCL).

[0033] Multiple types of QCL (QCL types) can also be defined. For example, four different QCL types A - D can be set for parameters (or parameter sets) that can be assumed to be the same. The following shows these parameters (which can also be called QCL parameters):

[0034] · QCL type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread;

[0035] · QCL type B (QCL-B): Doppler shift and Doppler spread;

[0036] · QCL type C (QCL-C): Doppler shift and average delay;

[0037] · QCL type D (QCL-D): Spatial reception parameter.

[0038] A situation where the UE assumes that a certain control resource set (CORESET), channel, or reference signal is in a specific QCL relationship (e.g., QCL type D) with other CORESETs, channels, or reference signals can also be referred to as a QCL assumption.

[0039] The UE can also determine at least one of the transmission beam (Tx beam) and reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0040] The TCI state can also be, for example, information related to the QCL between the channel that is the object (in other words, the reference signal (RS) used for this channel) and other signals (e.g., other RS). The TCI state can also be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0041] In the present disclosure, the higher layer signaling can be, for example, any one of radio resource control (RRC) signaling, medium access control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0042] The MAC signaling can also use, for example, MAC control element (MAC-CE), MAC protocol data unit (PDU), etc. The broadcast information can also be, for example, master information block (MIB), system information block (SIB), minimum system information (remaining minimum system information (RMSI)), other system information (OSI), etc.

[0043] The physical layer signaling can also be, for example, downlink control information (downlink control information (DCI)).

[0044] A channel configured (designated) with a TCI state or a spatial relation may also be, for example, 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)).

[0045] In addition, the RS in a QCL relationship with the channel may also be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a measurement reference signal (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).

[0046] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0047] The UE may also receive, via higher layer signaling, configuration information (e.g., PDSCH-Config, tci-StatesToAddModList) including a list of information elements of TCI states.

[0048] The information element of the TCI state (the "TCI-state IE" of RRC) set by the high-layer signaling may also include the TCI state ID and one or more QCL information ("QCL-Info"). The QCL information may also include at least one of information related to the RS that is in a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may also include information such as the index of the RS (e.g., SSB index, Non-Zero-Power (NZP) CSI-RS resource ID (Identifier)), the index of the cell where the RS is located, and the index of the bandwidth part (Bandwidth Part (BWP)) where the RS is located.

[0049] In Rel. 15 NR, as the TCI state of at least one of PDCCH and PDSCH, both the RS of QCL type A and the RS of QCL type D can be set for the UE, or only the RS of QCL type A can be set.

[0050] When the TRS is set as the RS of QCL set A, the TRS is different from the demodulation reference signal (DeModulation Reference Signal (DMRS)) of PDCCH or PDSCH, and it is conceivable to transmit the same TRS periodically for a long time. The UE measures the TRS and can calculate the average delay, delay spread, etc.

[0051] For the UE in which the TRS is set as the RS of QCL type A for the TCI state of the DMRS of PDCCH or PDSCH, it can be assumed that the parameters of QCL type A (average delay, delay spread, etc.) of the DMRS of PDCCH or PDSCH are the same as those of the TRS. Therefore, based on the measurement result of the TRS, the parameters of type A (average delay, delay spread, etc.) of the DMRS of PDCCH or PDSCH can be obtained. When the UE performs channel estimation of at least one of PDCCH and PDSCH, using the measurement result of the TRS, more accurate channel estimation can be performed.

[0052] The UE set with the RS of QCL type D can determine the UE receive beam (spatial domain receive filter, UE spatial domain receive filter) using the RS of QCL type D.

[0053] The RS of QCL type X of the TCI state may mean the RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and this RS may also be referred to as the QCL source of QCL type X of this TCI state.

[0054] (Path loss RS)

[0055] Path loss PL in transmit power control of PUSCH, PUCCH, and SRS respectively b,f,c (q d ) [dB] is calculated by the UE using the index q of the reference signal (RS, path loss reference RS (PathlossReferenceRS)) for the downlink BWP associated with the active UL BWP b of the carrier f of the serving cell c d In the present disclosure, the path loss reference signal, path loss reference RS, pathloss (PL)-RS, index q d , the RS used for path loss calculation, and the RS resource used for path loss calculation can also be replaced with each other. In the present disclosure, calculate, estimate, measure, and track can also be replaced with each other

[0056] The UE can also control the calculation of the path loss (or transmit power) in each UL channel / UL signal based on the path loss reference signal (PL-RS) set for each UL channel / UL signal. In a specific case, the PL-RS can also be activated / updated by the MAC control information (MAC CE)

[0057] The specific case is the case where multiple PL-RSs are set (e.g., multiple PL-RS candidates, or a list of PL-RSs) (Case A), or the case where the default spatial relation (default spatial relation / PL-RS) is applied / set (Case B)

[0058] In Case A, for example, the network can set multiple PL-RSs for the UE using a higher layer parameter (e.g., RRC) and specify the PL-RS to be activated from the multiple PL-RSs using the MAC CE. The multiple PL-RSs can also be replaced with multiple PL-RS candidates, or a list containing multiple PL-RS candidates

[0059] In addition, using the MAC CE, the activation of up to a specific number (e.g., 4) of PL-RSs can also be supported. Up to a specific number of PL-RSs can be activated per cell (or per BWP), or up to a specific number of PL-RSs can be activated per UL channel / UL signal

[0060] The maximum number of PL-RSs that can be configured via RRC may also depend on the UE capabilities. When the maximum number of PL-RSs that can be configured via RRC is X, PL-RS candidates equal to or less than X may be configured via RRC, and the PL-RSs are selected from the configured PL-RSs by means of MAC CE. The maximum number of PL-RSs that can be configured via RRC may also be 4, 8, 16, 64, etc.

[0061] (Default TCI state / Default spatial relation / Default PL-RS)

[0062] In RRC connected mode, when the TCI information (higher layer parameter TCI-PresentInDCI) in DCI is set to "enabled", and when the TCI information in DCI is not configured, if the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by this DCI) is less than the threshold (timeDurationForQCL) (application condition, first condition), in the case of non-cross-carrier scheduling, the TCI state (default TCI state) of the PDSCH may also be the TCI state of the lowest CORESET ID in the latest time slot within the active DL BWP of the CC of the (specific UL signal). Otherwise, the TCI state (default TCI state) of the PDSCH may also be the TCI state of the lowest TCI state ID of the PDSCH within the active DL BWP of the scheduled CC.

[0063] In Rel.15, MAC CE for activating / deactivating the PUCCH spatial relation and MAC CE for activating / deactivating the SRS spatial relation are each required. The PUSCH spatial relation is based on the SRS spatial relation.

[0064] In Rel.16, at least one of the MAC CE for activating / deactivating the PUCCH spatial relation and the MAC CE for activating / deactivating the SRS spatial relation may not be used.

[0065] If in FR2, when the spatial relation of PUCCH and PL-RS are not configured (application condition, second condition), the default assumptions for the spatial relation of PUCCH and PL-RS (default spatial relation and default PL-RS) are applied. If in FR2, when the spatial relation of SRS (SRS resource for SRS, or the SRS resource corresponding to the SRI (SRS Resource Identifier) in DCI format 0_1 for scheduling PUSCH) and PL-RS are not configured (application condition, second condition), the default assumptions for the spatial relation and PL-RS are applied to the PUSCH and SRS scheduled by DCI format 0_1 (default spatial relation and default PL-RS).

[0066] If CORESET is configured in the activated DL BWP on this CC, the default spatial relation and default PL-RS can also be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in this activated DL BWP. If CORESET is not configured in the activated DL BWP on this CC, the default spatial relation and default PL-RS can also be the activated TCI state with the lowest ID of the PDSCH in this activated DL BWP.

[0067] In Rel.15, the spatial relation of the PUSCH scheduled by DCI format 0_0 is based on the spatial relation of the PUCCH resource with the lowest PUCCH resource ID among the activated spatial relations of PUCCH on the same CC. Even when PUCCH is not transmitted on the SCell, the network needs to update the PUCCH spatial relations on all SCell.

[0068] In Rel.16, PUCCH configuration for the PUSCH scheduled by DCI format 0_0 is not required. For the PUSCH scheduled by DCI format 0_0, when there is no activated PUCCH spatial relation or no PUCCH resource on the activated UL BWP within this CC (application condition, second condition), the default spatial relation and default PL-RS are applied to this PUSCH.

[0069] The above threshold can also be referred to as the QCL time duration, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", schedule offset threshold, scheduling offset threshold, etc.

[0070] (Transmission power control for PUSCH)

[0071] When the UE is provided with settings for power control of the PUSCH based on the SRS resource identifier (sounding reference signal (SRS) resource indicator (SRI)) (e.g., SRI-PUSCH-PowerControl), and is provided with a value greater than 1 for the ID of the PL-RS, a mapping between the set of values for the SRI field in DCI format 0_1 and the set of ID values of the PL-RS can also be obtained from higher layer signaling (e.g., sri-PUSCH-PowerControl-Id in SRI-PUSCH-PowerControl). The UE can also determine the RS resource index q based on the ID of the PL-RS mapped to the SRI field value in DCI format 0_1 that schedules the PUSCH. d .

[0072] As Figure 1 shown, in Rel.15, for the PUSCH, it is set through RRC parameters to include the PL-RS ID (PUSCH-PathlossReferenceRS-Id) and the PL-RS of the RS (PUSCH-PathlossReferenceRS).

[0073] If the UE is not provided with the PL-RS for the PUSCH (PUSCH-PathlossReferenceRS), or before the UE is provided with dedicated higher layer parameters, the UE uses the reference signal (RS) resource from the SS / PBCH block that the UE uses to obtain the Master Information Block (MIB) to calculate the PL.b,f,c (q d )。

[0074] PL b,f,c (q d ) For example, it is the path loss [dB] calculated by the UE using the index q of the RS (PL-RS) for the downlink BWP associated with the activated UL BWP b of the carrier f of the serving cell c. d

[0075] If the PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with the spatial setting for PUCCH transmission, or if the PUSCH transmission is scheduled by DCI format 0_1 that does not include the SRI field, or if the SRI-PUSCH power control information (SRI-PUSCH-PowerControl) is not provided to the UE, the UE determines the RS resource index q with the respective PUSCH-PathlossReferenceRS-Id equal to zero. d Here, the RS resource is on any of the following: the serving cell c; and the serving cell indicated according to the value of the pathlossReferenceLinkng if provided.

[0076] For correct path loss measurement for transmission power control, the Rel.15 UE is configured by RRC with a specific number (e.g., 4) of PL-RSs.

[0077] In Rel.16, as Figure 2 shown, for the PL-RS of the PUSCH, the pathlossReferenceRSToAddModList-r16 is configured by RRC parameter, and the PL-RS within the PL-RS list is activated by MAC CE.

[0078] For example, the Rel.16 UE is configured by RRC signaling with up to 64 PL-RSs, and 1 or a specific number of PL-RSs are indicated (activated) by MAC CE. The UE may also be required to track up to 4 activated PL-RSs for all UL channels (SRS and PUCCH or PUSCH). The so-called tracking PL-RS means calculating the path loss based on the measurement of the PL-RS and maintaining (storing) the path loss.

[0079] On the other hand, the following scenario is also considered, i.e., multiple PL-RSs are configured (step 101), and UL transmission / UL transmission is scheduled (step 102) before a specific PL-RS (e.g., one or a specific number of PL-RSs below) is activated by MAC CE (step 103) (refer to Figure 3 ). In this case, the problem becomes which PL-RS the UE selects. For example, before a specific PL-RS is activated by MAC CE, when the PUSCH is scheduled by a specific DCI format including the SRI field (or when there is no activated PL-RS specified by the SRI), the problem becomes how to determine the PL-RS to be applied to the PUSCH.

[0080] Or, when the default spatial relation / PL-RS is applied and the corresponding TCI state is not activated by MAC CE, the problem becomes how the UE determines the PL-RS.

[0081] The inventors of the present invention noticed that in the case where multiple PL-RSs are configured, a state / period occurs in which a specific PL-RS is not scheduled by MAC CE, and studied a method for determining the PL-RS during the state / period in which the specific PL-RS is not scheduled, thus arriving at the present embodiment.

[0082] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments can be applied separately or in combination.

[0083] In the present disclosure, "A / B" and "at least one of A and B" can also be replaced with each other. In the present disclosure, a cell, a CC, a carrier, a BWP, and a band can also be replaced with each other. In the present disclosure, an index, an ID, an indicator, and a resource ID can also be replaced with each other. In the present disclosure, an RRC parameter, a higher layer parameter, an RRC information element (IE), and an RRC message can also be replaced with each other.

[0084] In the present disclosure, a TCI state, a QCL assumption, a QCL parameter, a spatial domain reception filter, a UE spatial domain reception filter, a UE reception beam, a DL reception beam, DL precoding, a DL precoder, a DL-RS, an RS of QCL type D of a TCI state or a QCL assumption, and an RS of QCL type A of a TCI state or a QCL assumption can also be replaced with each other. In the present disclosure, an RS of QCL type D, a DL-RS associated with QCL type D, a DL-RS having QCL type D, a source of the DL-RS, an SSB, and a CSI-RS can also be replaced with each other.

[0085] In the present disclosure, spatial relationship, spatial relationship information, spatial relationship assumption, QCL parameter, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL transmission beam, UL precoding, UL precoder, RS for spatial relationship, DL-RS, QCL assumption, SRI, spatial relationship based on SRI, UL TCI may also be interchangeable with each other.

[0086] In the present disclosure, DCI format 0_0, DCI without SRI, DCI without indication of spatial relationship, DCI without CIF may also be interchangeable with each other. In the present disclosure, DCI format 0_1, DCI with SRI, DCI with indication of spatial relationship, DCI with CIF may also be interchangeable with each other.

[0087] (First method)

[0088] In the first method, when multiple path loss reference signals are set for a specific UL channel / UL signal and none of them are activated by MAC CE, UL transmission (e.g., calculation of path loss) is controlled using a specific path loss reference signal (see Figure 4 ).

[0089] The multiple path loss reference signals (PL-RS) may also be referred to as multiple PL-RS candidates, or a list of PL-RS. The specific UL channel / UL signal may also be at least one of PUCCH, PUSCH, and SRS. The case / period when not activated by MAC CE may also be any of the following: before receiving the MAC CE for indicating activation of PL-RS, after receiving the MAC CE for indicating deactivation of all PL-RS, or when there is no activated PL-RS.

[0090] The specific PL-RS may also be a specific PL-RS selected from multiple PL-RS (Option 1-1). Alternatively, the specific PL-RS may also be a specific reference signal (e.g., synchronization signal block (e.g., SSB or SS / PBCH block)) (Option 1-2).

[0091] <Option 1-1>

[0092] As the specific PL-RS, the UE may also apply the PL-RS with the smallest index (or the PL-RS in the list of PL-RS with the smallest index) among the multiple PL-RS set by higher layer parameters. Alternatively, as the specific PL-RS, the UE may also apply the PL-RS with the largest index (or the PL-RS in the list of PL-RS with the largest index) among the multiple PL-RS set by higher layer parameters.

[0093] A specific PL-RS can be one, or multiple but not exceeding a specific quantity. In the case of selecting multiple PL-RS, the multiple PL-RS can also be selected in index order.

[0094] Alternatively, as a specific PL-RS, the UE can also select one or more PL-RS from multiple PL-RS set by higher layer parameters. That is to say, in the case where no specific PL-RS is specified for activation by MAC CE, the UE can also autonomously select PL-RS from the PL-RS list set by RRC to control the calculation of path loss.

[0095] Thereby, even when there is no PL-RS activated by MAC CE (when all PL-RS set by RRC are in the deactivated state), the PL-RS to be applied by the UE can be determined.

[0096] <Option 1-2>

[0097] When the activated DL BWP in a certain CC is set with a CORESET as the PL-RS, a reference signal corresponding to the QCL assumption applicable to this CORESET (for example, SSB, SS / PBCH block) can also be used.

[0098] When the activated DL BWP in a certain CC is not set with a CORESET and the TCI state of PDSCH is not activated, a reference signal of a specific type (for example, type D) can also be used as a specific path loss reference signal.

[0099] The reference signal of a specific type can also be the type D reference signal with the smallest (or, largest) index in the TCI state list set for the activated DL BWP in a certain CC.

[0100] Alternatively, the reference signal of a specific type can also be the type D reference signal with the smallest (or, largest) DCI code point in the TCI state list set for the activated DL BWP in a certain CC. The DCI code point can also be the code point specifying the TCI state. In addition, the TCI state candidates included in the TCI state list set by RRC can also be below a specific value (for example, 8, or the quantity that does not require specification by MAC CE).

[0101] In this way, by using a specific path loss reference signal, even when no PL-RS is activated by MAC CE, UL transmission (for example, the calculation of path loss) can be appropriately controlled.

[0102] (Second Method)

[0103] In the second method, when multiple PL-RSs are configured for a specific UL channel / UL signal and none of them are activated by MAC CE, the default spatial relation / path loss reference signal is used to control UL transmission (e.g., calculation of path loss).

[0104] The UE may also apply the default spatial relation / PL-RS (e.g., defaultspatial relation / PL-RS) when a list of PL-RSs is configured for a specific UL channel / UL signal and none of the PL-RSs included in the list are activated by MAC CE.

[0105] When the default PL-RS is included in the multiple PL-RSs configured by RRC, the UE may also control UL transmission using at least the default PL-RS. In this case, Option 1-2 in the first method may also be applied.

[0106] On the other hand, when the default PL-RS is not included in the multiple path loss reference signals configured by RRC, the UE may also apply Option 2-1 or Option 2-2 below.

[0107] <Option 2-1>

[0108] The UE controls UL transmission using one or more PL-RSs selected from the default PL-RS and the list of PL-RSs configured by RRC (or multiple PL-RSs included in the list). That is, before a specific PL-RS is activated by MAC CE, the UE needs to support the list of PL-RSs configured by RRC (or multiple PL-RSs included in the list) and the default PL-RS.

[0109] Regarding which PL-RS is selected, it can be determined based on the index of the PL-RS, or the UE can decide autonomously. Alternatively, the default PL-RS may be preferentially selected. For example, when the UE selects one PL-RS, it may select the default PL-RS. In addition, when the UE selects multiple PL-RSs, it may select the default PL-RS and at least one PL-RS included in the multiple PL-RSs configured by RRC.

[0110] <Option 2-2>

[0111] The UE can also perform control so that the default PL-RS is not applied. In this case, the UE can control the UL transmission by using one or more PL-RSs selected from the list of PL-RSs (or multiple PL-RSs included in the list) set via RRC. For example, Option 1-1 in the first method can also be applied.

[0112] That is, before activating a specific path loss reference signal via MAC control information, the UE does not need to support the list of path loss reference signals (or multiple path loss reference signals included in the list) set via RRC, nor the default path loss reference signal.

[0113] (Third method)

[0114] In the third method, when multiple PL-RSs are set for a specific UL channel / UL signal and none of them are activated via MAC CE, the reference signal (e.g., SSB) used to obtain the master information block (e.g., MIB) is used to control the UL transmission (e.g., path loss calculation).

[0115] The UE can also, under specific conditions, control the path loss calculation by using the list of reference signals corresponding to the SSB used in obtaining the MIB. The specific conditions can also be any of the following: no PUSCH-PathlossReferenceRS is provided, before a PL-RS is provided via RRC, or before the UE is provided with PUSCH-PathlossReferenceRS-r16 for Rel.16 and activated via MAC CE.

[0116] (Variant 1)

[0117] In at least one of the above first to third methods, it is also possible to determine the PL-RS applied in the PUSCH transmission (e.g., transmission power / path loss calculation) based on at least one of the format of the DCI used to schedule the UL signal (e.g., PUSCH) and whether a specific field is included in the DCI format.

[0118] For example, it is assumed that multiple PL-RSs are set via RRC (e.g., RRCconfiguration / re-configuration) and before a specific PL-RS is activated / updated via MAC CE. In this case, different PL-RSs can be applied to the UL signal (e.g., PUSCH) scheduled by a specific DCI format including the SRI field and other UL signals.

[0119] For example, before activating the PL-RS by means of a MAC CE, the PL-RS applied in the transmission of a UL signal (e.g., PUSCH) scheduled by means of a specific DCI format including an SRI field may also be determined based on the first to third manners described above. The specific DCI format may also be at least one of DCI format 0_1 and DCI format 0_2, for example.

[0120] Thus, in the case where a UL signal is scheduled by means of a specific DCI format including an SRI field, even if there is no PL-RS (or PL-RS specified by means of an SRI) activated by means of a MAC CE, it is possible to determine the PL-RS to be applied by the UE.

[0121] On the other hand, in other cases, a reference signal resource index (q d ) in which the value of the PL-RS ID (PUSCH-PathlossReferenceRS-Id) of the PUSCH is equal to zero may also be applied. Other cases may also be a case where the PUSCH is scheduled by means of DCI format 0_0, or a case where the PUSCH is scheduled by means of DCI format 0_1 / 0_2 not including an SRI field.

[0122] In addition, during the period before a plurality of PL-RSs (or PL-RS) are set by means of RRC and a specific PL-RS is activated / updated by means of a MAC CE, the UE may not assume that the PUSCH is scheduled by means of a specific DCI format having an SRI field. In this case, during this period, control may also be performed to schedule the PUSCH by means of DCI format 0_0 or a specific DCI format not including an SRI field.

[0123] In addition, in the case where a plurality of PL-RSs (or a list of PL-RSs) are set by means of RRC, a correspondence relationship (or default mapping) between an ID (e.g., SRI-PUSCH-PwerControlID-r16) corresponding to the setting of power control of the PUSCH based on an SRI (e.g., SRI-PUSCH-PowerControl) and the ID of the PL-RS of the PUSCH (e.g., PUSCH-PathlossReferenceRS-Id-r16) may also be set (see Figure 5 ).

[0124] The UE may also transmit the PUSCH scheduled by a specific DCI format containing the SRI before being provided with the mapping of the SRI-PUSCH-PwerControlID and the PUSCH-PathlossReferenceRS-Id, and may also determine the reference signal resource index (q) based on the smallest PUSCH-PathlossReferenceRS-ID in the list set through RRC (or the PUSCH-PathlossReferenceRS-Id with a value equal to 0). d )

[0125] (Variant 2)

[0126] The setting of the power of the SRI-based PUSCH supported in the existing system (e.g., Rel.15) (e.g., sri-PUSCH-PowerControl) may also be set for UEs supporting Rel.16 and later. For example, even when the MAC CE is not sent after the PL-RS list is set through RRC, at least one default mapping may be set between the sri-PUSCH-PowerControlID and the PUSCH-PathlossReferenceRS-ID (refer to Figure 6 ).

[0127] As the PL-RS for the PUSCH scheduled by a specific DCI format (e.g., DCI format 0_1 / 0_2), the UE may also apply at least one of the following options A to C.

[0128] <Option A>

[0129] The UE may also not assume the case where the PUSCH is scheduled by a specific DCI format with a specific SRI field before being activated by the MAC CE. The specific SRI field may also have the following structure: that is, the SRI index is not set through RRC to be associated with the PUSCH-PathlossReferenceRS-ID.

[0130] This may also mean that in the case where the PUSCH is scheduled by a specific DCI format with an SRI field, in order to indicate the mapping of the SRI index to the PUSCH-PathlossReferenceRS-ID, the SRI index included in the DCI needs to be the SRI index set by the sri-PUSCH-PowerControl.

[0131] <Option B>

[0132] Alternatively, before being activated by MAC CE, if the PUSCH is scheduled by a specific DCI format with an SRI field and the SRI index included in the DCI is not configured by RRC in association with the PUSCH-PathlossReferenceRS-ID, the UE may also assume that the PL-RS corresponds to (or is mapped to) the PUSCH-PathlossReferenceRS-ID with sri-PUSCH-PowerControlID = 0.

[0133] <Option C>

[0134] Alternatively, if the UE is scheduled for PUSCH by a specific DCI format with an SRI field before being activated by MAC CE, the UE may also assume that the PL-RS corresponds to (or is mapped to) the PUSCH-PathlossReferenceRS-ID with sri-PUSCH-PowerControlID = 0.

[0135] (Wireless communication system)

[0136] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0137] Figure 7 FIG. is an example showing a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0138] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRAN-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0139] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0140] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0141] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a wider coverage area, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the illustrated manner. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0142] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) that uses multiple Component Carriers (CCs).

[0143] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a sub-6 GHz band, and FR2 may be a band above 24 GHz. Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to this. For example, FR1 may correspond to a band higher than FR2.

[0144] Furthermore, the user terminal 20 may also communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0145] Multiple base stations 10 may be connected by wire (e.g., optical fibers compliant with the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as the backhaul between base stations 11 and 12, the base station 11, which is equivalent to a high-level station, may be referred to as an Integrated Access Backhaul (IAB) host, and the base station 12, which is equivalent to a relay station (relay), may also be referred to as an IAB node.

[0146] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly connected to the core network 30. The core network 30 may, for example, also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0147] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, 5G, etc.

[0148] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the Downlink (DL) and the Uplink (UP), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can be used.

[0149] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, for the wireless access methods of UL and DL, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used.

[0150] In the wireless communication system 1, as a downlink channel, a Physical Downlink Shared Channel (PDSCH), a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), etc., which are shared by each user terminal 20, can also be used.

[0151] Furthermore, in the wireless communication system 1, as an uplink channel, a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), etc., which are shared by each user terminal 20, can also be used.

[0152] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, the Master Information Block (MIB) can also be transmitted through PBCH.

[0153] Low-layer control information can also be transmitted through PDCCH. The low-layer control information can also include, for example, downlink control information (DCI: Downlink Control Information) containing scheduling information for at least one of PDSCH and PUSCH.

[0154] In addition, the DCI for scheduling PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, PDSCH can also be replaced by DL data, and PUSCH can also be replaced by UL data.

[0155] In the detection of PDCCH, a control resource set (CORESET) and a search space can also be used. The CORESET corresponds to the resource for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0156] One search space can also correspond to PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure can also be replaced with each other.

[0157] Through the PUCCH, it is also possible to transmit uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., which may also be referred to as Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)). Through the PRACH, it is also possible to transmit a random access preamble for establishing a connection with a cell.

[0158] In addition, in the present disclosure, the downlink, uplink, etc. may also be expressed without appending "link". Furthermore, the beginning of various channels may also be expressed without appending "Physical".

[0159] In the wireless communication system 1, it is also possible to transmit a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. In the wireless communication system 1, as the DL-RS, it is also possible to transmit a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc.

[0160] The synchronization signal may also be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0161] In addition, in the wireless communication system 1, as the uplink reference signal (UL-RS), it is also possible to transmit a measurement reference signal (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, DMRS can also be referred to as a user terminal specific reference signal (UE-specific reference signal).

[0162] (Base station)

[0163] Figure 8 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be included respectively.

[0164] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the base station 10 further has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0165] The control unit 110 implements overall control of the base station 10. The control unit 110 can be constituted by a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0166] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may also generate data, control information, a sequence, etc. to be transmitted as a signal, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0167] The transmission and reception unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and reception unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission and reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0168] The transmission and reception unit 120 may be configured as an integrated transmission and reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may also be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may also be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0169] The transmission and reception antenna 130 may be composed of an antenna such as an array antenna, which is described based on the common knowledge in the technical field related to the present disclosure.

[0170] The transmission and reception unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmission and reception unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0171] The transmission and reception unit 120 may also form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0172] The transmission and reception unit 120 (transmission processing unit 1211) may also perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0173] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0174] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0175] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0176] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0177] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to 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 also measure the received power (e.g., Reference Signal Received Power (RSRP)), the received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), the signal strength (e.g., Received Signal Strength Indicator (RSSI)), the propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0178] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and obtain and transmit the user data (user plane data), control plane data, etc. for the user terminal 20.

[0179] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0180] The transmission / reception unit 120 may also transmit a list including a plurality of Path Loss Reference Signals (PL-RS) (or, a plurality of PL-RS candidates). The transmission / reception unit 120 may also receive an uplink signal in which the path loss is calculated based on a specific PL-RS when none of the plurality of PL-RS is in an active state.

[0181] The transmission / reception unit 120 may also use DCI including an SRS resource identifier field to control the scheduling of the uplink signal.

[0182] (User Terminal)

[0183] Figure 9This is a diagram showing an example of the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Additionally, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be included respectively.

[0184] Furthermore, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the user terminal 20 further has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0185] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to this disclosure.

[0186] The control unit 210 may also control the generation, mapping, etc. of signals. The control unit 210 may also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0187] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on the common knowledge in the technical field related to this disclosure.

[0188] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0189] The transmission / reception antenna 230 can be composed of an antenna such as an array antenna described based on the common knowledge in the technical field related to this disclosure.

[0190] The transmission / reception unit 220 may also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 may also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0191] The transmitting and receiving unit 220 may also form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0192] The transmitting and receiving unit 220 (transmission processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, for example, and generate a bit string to be transmitted.

[0193] The transmitting and receiving unit 220 (transmission processing unit 2211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0194] In addition, regarding whether to apply DFT processing, it may also be based on the setting of transform precoding. When transform precoding is effective (enabled) for a certain channel (e.g., PUSCH), the transmitting and receiving unit 220 (transmission processing unit 2211) may perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, DFT processing may not be performed as the above-mentioned transmission processing.

[0195] The transmitting and receiving unit 220 (RF unit 222) may also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting and receiving antenna 230.

[0196] On the other hand, the transmitting and receiving unit 220 (RF unit 222) may also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmitting and receiving antenna 230.

[0197] The transmitting and receiving unit 220 (reception processing unit 2212) may also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0198] The transmitting and receiving unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also measure the received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0199] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230.

[0200] The transmitting and receiving unit 220 may also receive a list including a plurality of path loss reference signals (PL-RS).

[0201] When none of the plurality of PL-RS is in an active state, the control unit 210 may calculate the path loss for the uplink signal scheduled by DCI including the SRS resource identifier field by using a specific PL-RS.

[0202] The specific PL-RS may be selected from the plurality of PL-RS. Alternatively, the specific PL-RS may be selected from a list of the set transmission configuration indication (TCI) states. Alternatively, the specific PL-RS may be selected from at least one of the plurality of PL-RS and the default PL-RS.

[0203] (Hardware Structure)

[0204] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and implemented by using these multiple devices. The functional block may also be implemented by combining software with the above one device or the above multiple devices.

[0205] Here, the functions include: judging, deciding, determining, calculating, computing, processing, exporting, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, choosing, establishing, comparing, envisioning, expecting, regarding as, broadcasting, notifying, communicating, forwarding, configuring (setting), reconfiguring (resetting), allocating, mapping, assigning, etc., but are not limited thereto. For example, a functional block (structural unit) that functions as sending can also be referred to as a transmitting unit, a transmitter, etc. Whichever it is, as described above, its implementation method is not particularly limited.

[0206] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can function as a computer that processes the wireless communication method of the present disclosure. Figure 10 FIG. is an example of the hardware structure of a base station and a user terminal according to an embodiment. The above base station 10 and user terminal 20 can physically be 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, and a bus 1007, etc.

[0207] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or can be configured not to include some devices.

[0208] For example, only one processor 1001 is shown in the figure, but there can also be multiple processors. In addition, the processing can be executed by one processor, or the processing can be executed by two or more processors simultaneously, sequentially, or by other methods. In addition, the processor 1001 can also be implemented by one or more chips.

[0209] Each function in the base station 10 and the user terminal 20 is implemented, for example, by loading a specific software (program) onto hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs operations and controls at least one of the communication via the communication device 1004 or the reading and writing of data in the memory 1002 and the storage 1003.

[0210] The processor 1001 enables, for example, an operating system to operate and controls the entire computer. The processor 1001 may be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the control unit 110 (210), the transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0211] Furthermore, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes the computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same applies to other functional blocks.

[0212] The memory 1002 is a computer-readable recording medium, and may be constituted by, for example, at least one of a read-only memory (Read Only Memory (ROM)), an erasable programmable ROM (Erasable Programmable ROM (EPROM)), an electric EPROM (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and other suitable storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store an executable program (program code), a software module, etc. for implementing the wireless communication method according to an embodiment of the present disclosure.

[0213] The storage 1003 is a computer-readable recording medium, and may be constituted by, for example, at least one of a flexible disk, a floppy (registered trademark) disk, an optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0214] The communication device 1004 is hardware (a transmitting and receiving device) for performing inter-computer communication via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, the above-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 120 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated into a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0215] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 may also have an integrated structure (e.g., a touch panel).

[0216] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for information communication. The bus 1007 may be configured by a single bus or by different buses between each device.

[0217] In addition, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an application specific integrated circuit (ASIC: Application Specific Integrated Circuit), a programmable logic device (PLD: Programmable Logic Device), and a field programmable gate array (FPGA: Field Programmable Gate Array), and may also implement a part or all of each functional block using this hardware. For example, the processor 1001 may be implemented using at least one of these hardwares.

[0218] (Modification example)

[0219] In addition, terms described in the present disclosure and terms required 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 (either "signal" or "signaling") may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be abbreviated as RS, and depending on the applied standard, it may also be referred to as a Pilot, a pilot signal, etc. In addition, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0220] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may be a fixed duration (e.g., 1 ms) independent of the numerology.

[0221] Here, the numerology may also be communication parameters applied to at least one of transmission and reception of a certain signal or channel. The numerology may, for example, also represent at least one of 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 transmitter-receiver in the frequency domain, a specific windowing process performed by a transmitter-receiver in the time domain, etc.

[0222] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on the numerology.

[0223] A time slot may also include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. Compared with a time slot, a mini-slot may be composed of a smaller number of symbols. A PDSCH (or PUSCH) transmitted by a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0224] A radio frame, subframe, time slot, mini-slot, and symbol all represent time units for transmitting signals. A radio frame, subframe, time slot, mini-slot, and symbol may also have other corresponding names. In addition, time units such as frames, subframes, time slots, mini-slots, and symbols in the present disclosure can also be replaced with each other.

[0225] For example, 1 subframe can also be referred to as a TTI, multiple consecutive subframes can also be referred to as a TTI, 1 time slot or 1 mini-slot can also be referred to as a TTI. That is, at least one of the subframe and the TTI can be the subframe (1 ms) in the existing LTE, can also be a period shorter than 1 ms (e.g., 1 - 13 symbols), or can be a period longer than 1 ms. In addition, the unit representing the TTI can also be referred to as a time slot, mini-slot, etc. instead of a subframe.

[0226] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of the TTI is not limited to this.

[0227] The TTI can be the transmission time unit for data packets (transport blocks), code blocks, codewords, etc. after channel coding, and can also be the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (e.g., the number of symbols) actually mapped by the transport block, code block, codeword, etc. can be shorter than the TTI.

[0228] In addition, when 1 time slot or 1 mini-slot is referred to as a TTI, 1 or more TTIs (i.e., 1 or more time slots or 1 or more mini-slots) can be the minimum time unit for scheduling. In addition, the number of time slots (mini-slot numbers) constituting the minimum time unit of this scheduling can also be controlled.

[0229] The TTI with a duration of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. The TTI shorter than the normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI, shortened subframe, short subframe, mini-slot, sub-slot, time slot, etc.

[0230] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be replaced with a TTI having a duration exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be replaced with a TTI having a TTI length less than that of the long TTI and more than 1 ms.

[0231] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it can also include one or more consecutive subcarriers (subcarriers). The number of subcarriers included in an RB can also be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers included in an RB can also be determined based on the parameter set.

[0232] In addition, an RB can include one or more symbols in the time domain, and can also be the length of one time slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be composed of one or more resource blocks respectively.

[0233] In addition, one or more RBs can also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0234] In addition, a resource block can also be composed of one or more resource elements (REs). For example, one RE can also be a radio resource area of one subcarrier and one symbol.

[0235] A bandwidth part (BWP) (which can also be referred to as a partial bandwidth, etc.) can also represent a subset of consecutive common RBs (common resource blocks) for a certain parameter set in a certain carrier. Here, the common RBs can also be determined by the index of the RBs based on the common reference point of the carrier. A PRB can also be defined in a certain BWP and numbered within that BWP.

[0236] 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 set within one carrier.

[0237] At least one of the BWPs that can be set can be activated, and the UE may not assume to transmit and receive specific signals / channels outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure can also be replaced with "BWP".

[0238] In addition, the structures of the above-mentioned wireless frames, sub-frames, time slots, mini time slots, and symbols are only examples. For example, the number of sub-frames included in a wireless frame, the number of time slots in each sub-frame or wireless frame, the number of mini time slots included in a time slot, the symbols included in a time slot or mini time slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0239] In addition, the information, parameters, etc. described in the present disclosure can be represented using absolute values, relative values with respect to a specific value, or can be represented using corresponding other information. For example, wireless resources can also be indicated by a specific index.

[0240] The names used for parameters, etc. in the present disclosure are not restrictive names at any point. Furthermore, mathematical expressions using these parameters, etc. can also be different from the mathematical expressions explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, and thus the various names assigned to these various channels and information elements are not restrictive names at any point.

[0241] The information, signals, etc. described in the present disclosure can be represented using any one of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0242] In addition, information, signals, etc. can be output in at least one direction from high layer to low layer and from low layer to high layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0243] The information, signals, etc. that are input and output can be stored in a specific area (e.g., a memory), or can be managed using a management table. The information, signals, etc. that are input and output can also be overwritten, updated, or appended. The information, signals, etc. that are output can also be deleted. The information, signals, etc. that are input can also be sent to other devices.

[0244] The notification of information is not limited to the manner / embodiment described in this disclosure, and other methods can also be used. For example, the notification of information in this disclosure can be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0245] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message. For example, it can also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. In addition, MAC signaling can also be notified using, for example, a MAC Control Element (CE).

[0246] In addition, the notification of specific information (e.g., the notification of "is X") is not limited to explicit notification, and can also be performed implicitly (e.g., by not performing the notification of the specific information or by the notification of other information).

[0247] The determination can be made by a value represented by 1 bit (0 or 1), can also be made by a true / false value (boolean) represented by true or false, and can also be made by a numerical comparison (e.g., comparison with a specific value).

[0248] Regardless of whether software is referred to as software, firmware, middleware, microcode, hardware description language, or by other names, it should be broadly interpreted as representing instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, processes, functions, etc.

[0249] In addition, software, instructions, information, etc. can be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (such as coaxial cables, optical fibers, twisted pairs, and Digital Subscriber Line (DSL)) and wireless technologies (such as infrared rays, microwaves, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0250] In the present disclosure, the terms "system" and "network" can be used interchangeably. "Network" can also represent a device included in the network (such as a base station).

[0251] 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 also be used interchangeably.

[0252] 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 are also cases where base stations are referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0253] The base station can accommodate one or more (e.g., three) cells. In the case where the base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services within the coverage range.

[0254] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0255] The mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, or some other suitable terms.

[0256] At least one of the base station and the mobile station may also be referred to as a transmitting device, receiving device, wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0257] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a structure that replaces the communication between the base station and the user terminal with the communication between multiple user terminals (e.g., which may also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various methods / embodiments of the present disclosure can also be applied. In this case, it can be set as a structure in which the user terminal 20 has the functions of the above-mentioned base station 10. In addition, words such as "uplink" and "downlink" can also be replaced with words corresponding to inter-terminal communication (e.g., "side"). For example, the uplink channel, downlink channel, etc. can also be replaced with a side channel.

[0258] Similarly, the user terminal in the present disclosure can also be replaced by a base station. In this case, it can be set that the base station 10 has a structure with the functions that the above user terminal 20 has.

[0259] In the present disclosure, regarding the operations performed by the base station, sometimes they are also performed by its upper node according to the situation. In a network including one or more network nodes having base stations, various operations for communicating with terminals can obviously be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0260] Each mode / embodiment described in the present disclosure can be used alone, combined, or switched during execution. In addition, for the processing procedures, timings, flowcharts, etc. of each mode / embodiment described in the present disclosure, as long as there is no contradiction, the order can be swapped. For example, regarding the method described in the present disclosure, the elements of various steps are presented in the illustrated order, and are not limited to the specific order presented.

[0261] Each mode / embodiment described in the present disclosure can 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) (x is an integer or a decimal, for example), 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), and systems using other appropriate wireless communication methods, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0262] The description such as "based on" used in the present disclosure does not mean "only based on" unless otherwise explicitly described. In other words, the description such as "based on" means both "only based on" and "at least based on".

[0263] Any reference to an element using terms such as "first", "second", etc. in this disclosure does not comprehensively limit the quantity or order of these elements. These terms can be used in this disclosure as a convenient method for distinguishing between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted or that the first element must be located before the second element in a certain form.

[0264] The term "determining" used in this disclosure sometimes includes a variety of operations. For example, "determining" can be regarded as "determining" operations such as judging, calculating, computing, processing, deriving, investigating, looking up / searching / inquiring (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0265] In addition, "determining" can also be regarded as "determining" operations such as receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, accessing (e.g., accessing data in a memory), etc.

[0266] In addition, "determining" can also be regarded as "determining" operations such as resolving, selecting, choosing, establishing, comparing, etc. That is, "determining" can be regarded as "determining" certain operations.

[0267] In addition, "determining" can also be replaced by "assuming", "expecting", "considering", etc.

[0268] The "maximum transmit power" described in this disclosure can represent the maximum value of the transmit power, can also represent the nominal UE maximum transmit power, or can also represent the rated UE maximum transmit power.

[0269] As used in this disclosure, the terms "connected", "coupled", or any variations thereof, mean all direct or indirect connections or couplings between two or more elements, and can include cases where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access".

[0270] In this disclosure, when two elements are connected, it can be considered that they are "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, optical (both visible and invisible light) region, etc.

[0271] In this disclosure, the term "A is different from B" can also mean "A and B are mutually different". Additionally, this term can also mean "A and B are each different from C". Regarding terms such as "separated", "coupled", etc., they can be interpreted in the same way as "different".

[0272] When the terms "include", "including", and their variations are used in this disclosure, these terms, like the term "comprising", are meant to be inclusive. Further, the term "or" used in this disclosure is not an exclusive logical or.

[0273] In this disclosure, for example, in cases where articles are added due to translation such as a, an, and the in English, this disclosure can also include cases where the nouns connected after these articles are in the plural form.

[0274] Above, the invention related to this disclosure has been described in detail. However, for those skilled in the art, the invention related to this disclosure is obviously not limited to the embodiments described in this disclosure. The invention related to this disclosure can be implemented in the form of amendments and changes without departing from the gist and scope of the invention determined based on the claims. Therefore, the description of this disclosure is for illustrative purposes and does not impose any restrictive meaning on the invention related to this disclosure.

Claims

1. A terminal, characterized in that, it has: a receiving unit that receives a list including a plurality of path loss reference signals (PL-RS); and a control unit that, when none of the plurality of PL-RS is in an active state, controls the calculation of path loss for an uplink signal scheduled by DCI including an SRS resource identifier field, using a specific PL-RS, wherein the specific PL-RS is selected from a list of set transmission configuration indication (TCI) states, and is a reference signal with the smallest or largest code point of the DCI in the TCI state list.

2. A wireless communication method, characterized in that, it has: a step of receiving a list including a plurality of path loss reference signals (PL-RS); and a step of, when none of the plurality of PL-RS is in an active state, controlling the calculation of path loss for an uplink signal scheduled by DCI including an SRS resource identifier field, using a specific PL-RS, wherein the specific PL-RS is selected from a list of set transmission configuration indication (TCI) states, and is a reference signal with the smallest or largest code point of the DCI in the TCI state list.

3. A base station, characterized in that, it has: a transmitting unit that transmits a list including a plurality of path loss reference signals (PL-RS); a control unit that schedules an uplink signal using DCI including an SRS resource identifier field; and a receiving unit that, when none of the plurality of PL-RS is in an active state, receives the uplink signal for which path loss has been calculated based on a specific PL-RS, wherein the specific PL-RS is selected from a list of set transmission configuration indication (TCI) states, and is a reference signal with the smallest or largest code point of the DCI in the TCI state list.

Images