Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure is characterized by including: a receiving unit that receives first information indicating a path loss used in transmission power control; and a control unit that calculates a transmission power of an uplink signal, i.e., a UL signal, for a reception point where downlink data is not transmitted, based on the path loss. According to one aspect of the present disclosure, it is possible to appropriately determine the transmission power of the UL signal.

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) has been standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further large capacity and high performance of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Subsequent systems of LTE are also being studied (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 an existing LTE system (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, Physical Uplink Shared Channel (PUSCH)) and a UL control channel (for example, 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 wireless communication systems such as Rel. 15 NR, the coverage varies depending on the uplink (UL), downlink (DL), channels, etc. It is being studied that, in order to improve the coverage of the UL signal (UL channel), in addition to the transmit-receive points, receive points for the UL signal are also set.

[0010] However, it has not been clarified how to determine the transmit power for the transmit-receive points or the receive points. If the transmit power cannot be determined appropriately, there are concerns about deterioration of system performance such as limitations in coverage and reduction in throughput.

[0011] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately determine the transmit power of the UL signal.

[0012] Means for Solving the Problems

[0013] A terminal according to one aspect of the present disclosure is characterized by comprising: a receiving unit that receives first information indicating a path loss used in transmit power control; and a control unit that calculates the transmit power of an uplink signal, i.e., a UL signal, for a receive point that does not transmit downlink data, based on the path loss.

[0014] Advantages of the Invention

[0015] According to one aspect of the present disclosure, the transmit power of the UL signal can be appropriately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A It is a diagram showing a configuration example of a general transmit-receive point. Figure 1B It is a diagram showing a configuration example of UL high density.

[0017] Figure 2 It is a diagram showing Resource Utilization Method A.

[0018] Figure 3 It is a diagram showing Resource Utilization Method B.

[0019] Figure 4A It is a diagram showing an example of the association between the RS index and the PL value. Figure 4B It is a diagram showing an example of the association between the RS index and the delta PL value.

[0020] Figure 5 It is a diagram showing an example of the operation process after initial access.

[0021] Figure 6 It is an example where the UE sends multiple beams to the same receiving point.

[0022] Figure 7 It is an example where the UE sends multiple beams to different receiving points.

[0023] Figure 8 It is a diagram showing an example of sending a UL signal to a receiving point.

[0024] Figure 9 It is a diagram showing an example of sending a UL signal to the central TRP.

[0025] Figure 10 It is a diagram showing an example of the association between the RS index and multiple PL values / delta PL values.

[0026] Figure 11 It is related to Figure 10 A transmission example of the corresponding UL signal.

[0027] Figure 12 It is a diagram showing the first example of the association between the RS index and a PL / delta PL parameter.

[0028] Figure 13 It is related to Figure 12 A transmission example of the corresponding UL signal.

[0029] Figure 14 It is a diagram showing the second example of the association between the PL / delta PL parameter and the RS index.

[0030] Figure 15 It is related to Figure 14 A transmission example of the corresponding UL signal.

[0031] Figure 16 It is a diagram showing the third example of the association between the PL / delta PL parameter and the RS index.

[0032] Figure 17 It is related to Figure 16 A transmission example of the corresponding UL signal.

[0033] Figure 18This is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment.

[0034] Figure 19 This is a diagram showing an example of the structure of a base station according to an embodiment.

[0035] Figure 20 This is a diagram showing an example of the structure of a user terminal according to an embodiment.

[0036] Figure 21 This is a diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment. Detailed Embodiments

[0037] (Transmission Power Control)

[0038] <Transmission Power Control for PUSCH>

[0039] In NR, the transmission power of PUSCH is controlled based on the TPC command (also referred to as value, increment / decrement value, correction value, etc.) indicated by the value of a specific field (also called TPC command field, etc.) in DCI.

[0040] For example, when the UE uses a parameter set (open-loop parameter set) with index j and the index 1 of the power control adjustment state (PUSCH power control adjustment state) and transmits PUSCH on the active UL BWP b of carrier f in serving cell c, the transmission power (P PUSCH、b，f，c (i, j, q d , 1)) of PUSCH in the PUSCH transmission opportunity (transmission occasion) (also called transmission period, etc.) i can be represented by the following formula (1). The power control adjustment state can also be referred to as the value of the TPC command based on the power control adjustment state index 1, the cumulative value of the TPC command, or the value based on closed-loop. 1 can also be referred to as the closed-loop index.

[0041] In addition, the PUSCH transmission opportunity i is the period during which PUSCH is transmitted. For example, it can be composed of one or more symbols, one or more time slots, etc.

[0042] [Mathematical Formula 1]

[0043] Formula (1)

[0044]

[0045] Here, P CMAX，f，c(i) The transmit power of a user terminal (also known as the maximum transmit power, UE maximum output power, etc.) that is set, for example, for carrier f of serving cell c in transmission opportunity i. P O_PUSCH，b，f，c (j) Parameters related to the target receive power that are set, for example, for activated UL BWP b of carrier f of serving cell c in parameter set j (for example, also known as parameters related to transmit power offset, transmit power offset P0, target receive power parameters, etc.).

[0046] M PUSCH RB，b，f，c (i) The number of resource blocks (bandwidth) allocated to PUSCH, for example, for transmission opportunity i in activated UL BWP b of carrier f of serving cell c and subcarrier spacing μ. α b，f，c (j) A value provided by a higher layer parameter (for example, also known as msg3 - Alpha, p0 - PUSCH - Alpha, fractional factor, etc.).

[0047] PL b，f，c (q d ) The path loss (path loss compensation) calculated in the user terminal using the index q of the reference signal for the downlink BWP associated with activated UL BWP b of carrier f of serving cell c (reference signal (RS), path loss reference RS, RS for path loss reference, DL RS for path loss measurement, PUSCH - PathlossReferenceRS). d

[0048] Δ TF，b，f，c (i) The transmission power adjustment component (offset, transmit format compensation) for UL BWP b of carrier f of serving cell c.

[0049] f b，f，c (i, l) The PUSCH power control adjustment state for activated UL BWP b of carrier f of serving cell c in transmission opportunity i. For example, f b，f，c (i, l) can also be represented by Equation (2).

[0050] [Mathematical formula 2]

[0051] Equation (2)

[0052]

[0053] Here, δ PUSCH，b，f，c(i, l) can also be the TPC command value included in DCI format 0_0 or DCI format 0_1 that schedules the PUSCH transmission opportunity i on the activated UL BWP b of the carrier f of the serving cell c, or the TPC command value encoded by combining with other TPC commands in DCI format 2_2 with a CRC scrambled by a specific RNTI (Radio Network Temporary Identifier) (e.g., TPC-PUSCH-RNTI).

[0054] Σ m＝0 C(Di)-1 δ PUCCH，b，f，c (m, l) can also be the sum of the TPC command values in the set D i with a concentration (cardinality) C(D i ). D i can also be the set of TPC command values received by the UE between the K PUSCH (i - i0)-th symbol before the PUSCH transmission opportunity i and the K PUSCH (i)-th symbol before the PUSCH transmission opportunity i on the activated UL BWP b of the carrier f of the serving cell c for the PUSCH power control adjustment state l. i0 can also be the smallest positive integer earlier than the K PUSCH (i - i0)-th symbol before the PUSCH transmission opportunity i and earlier than the K PUSCH (i)-th symbol before the PUSCH transmission opportunity i.

[0055] When the PUSCH transmission is scheduled by DCI format 0_0 or DCI format 0_1, K PUSCH (i) can also be the number of symbols in the activated UL BWP b of the carrier f of the serving cell c that is after the last symbol of the corresponding PDCCH reception and before the first symbol of the PUSCH transmission. When the PUSCH transmission is configured by the configured grant configuration information (ConfiguredGrantConfig), K PUSCH (i) can also be the number of symbols per time slot N symb slot in the activated UL BWP b of the carrier f of the serving cell c and the minimum value provided by k2 in the PUSCH common configuration information (PUSCH-ConfigCommon) PUSCH，min multiplied by the number of symbols equal to the product.

[0056] Regarding the power control adjustment state, it can also be set to have multiple states (e.g., two states) or a single state through higher layer parameters. Additionally, in the case where multiple power control adjustment states are set, one of the multiple power control adjustment states can also be identified by an index l (e.g., l ∈ {0, 1}).

[0057] In the case where the UE is not provided with a path loss reference RS (e.g., PUSCH - PathlossReferenceRS), or in the case where the UE is not provided with dedicated higher layer parameters, the UE can also use the RS resources from the synchronization signal (SS) / physical broadcast channel (PBCH) block (SS block (SSB)) used to obtain the Master Information Block (MIB) to calculate the PL b，f，c (q d )

[0058] In the case where the UE is set with the number of RS resource indices up to the maximum number of path loss reference RS (e.g., maxNrofPUSCH - PathlossReferenceRS) values, and a set of respective RS settings for the RS resource indices based on the path loss reference RS, the set of RS resource indices can also include one or both of the set of SS / PBCH block indices and the set of channel state information (CSI) - reference signal (RS) resource indices. The UE can also identify the RS resource index q within the set of RS resource indices d 。

[0059] In the case where PUSCH transmission is scheduled by a Random Access Response (RAR) UL grant, the UE can also use the same RS resource index q as that for the corresponding PRACH transmission d 。

[0060] When the UE is provided with a setting for power control of PUSCH based on a sounding reference signal (SRS) resource indicator (SRI) (e.g., SRI-PUSCH-PowerControl), and is provided with more than one value of the ID of the path loss reference RS, a mapping between the set of values of the SRI field in DCI format 0_1 and the set of ID values of the path loss reference 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 path loss reference RS mapped to the SRI field value in DCI format 0_1 that schedules the PUSCH. d 。

[0061] When PUSCH transmission is scheduled by DCI format 0_0, and the UE is not provided with PUCCH spatial relation information for the PUCCH resource having the lowest index for each carrier f and serving cell c with an active UL BWP b, the UE can also use the same RS resource index q as the PUCCH transmission within the PUCCH resource. d 。

[0062] When PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with the spatial setting of the PUCCH transmission, or when PUSCH transmission is scheduled by DCI format 0_1 that does not contain an SRI field, or when the setting for power control of SRI-based PUSCH is not provided to the UE, the UE can also use the RS resource index q with an ID of the path loss reference RS of zero. d 。

[0063] For PUSCH transmission configured by a configured grant configuration (e.g., ConfiguredGrantConfig), when the configured grant configuration includes a specific parameter (e.g., rrc-CofiguredUplinkGrant), the RS resource index q d can also be provided to the UE through the path loss reference index (e.g., pathlossReferenceIndex) within the specific parameter.

[0064] For PUSCH transmission configured through a configured grant, in the case where the configured grant does not contain specific parameters, the UE can also determine the RS resource index q based on the value of the ID of the path loss reference RS mapped to the SRI field within the DCI format used to activate PUSCH transmission. d In the case where the DCI format does not contain the SRI field, the UE can also determine the RS resource index q with an ID of the path loss reference RS of zero. d .

[0065] In addition, Equations (1) and (2) are merely illustrative and not limited thereto. The user equipment only needs to control the transmission power of the PUSCH based on at least one of the parameters illustrated in Equations (1) and (2), and may include additional parameters or omit some parameters. Furthermore, in the above-mentioned Equations (1) and (2), the transmission power of the PUSCH is controlled for each active UL BWP of a certain carrier of a certain serving cell, but not limited thereto. At least a part of the serving cell, carrier, BWP, and power control adjustment state may also be omitted.

[0066] <PUCCH Transmission Power Control>

[0067] In addition, in NR, the transmission power of the PUCCH is controlled based on the TPC command (also referred to as value, increment / decrement value, correction value, indication value, etc.) indicated by the value of a specific field (also referred to as TPC command field, first field, etc.) within the DCI.

[0068] For example, using the index l of the power control adjustment state (PUCCH power control adjustment state), the transmission power (P PUCCH、b，f，c (i, q u , q d , l)) of the PUCCH in the transmission occasion (also referred to as transmission period, etc.) i of the active UL BWP b of the carrier f of the serving cell c can also be represented by the following Equation (3). The power control adjustment state may also be referred to as the value of the TPC command based on the power control adjustment state index l, the cumulative value of the TPC command, or the value based on closed-loop. l may also be referred to as the closed-loop index.

[0069] In addition, the PUCCH transmission occasion i is the period during which the PUCCH is transmitted. For example, it may be composed of one or more symbols, one or more time slots, etc.

[0070] [Mathematical Equation 3]

[0071] Equation (3)

[0072]

[0073] Here, P CMAX，f，c (i) is the transmission power of the user terminal (also referred to as the maximum transmission power, UE maximum output power, etc.) set for, for example, the carrier f of the serving cell c in transmission opportunity i. P O_PUCCH，b，f，c (q u ) is a parameter related to the target reception power set for, for example, the activation of UL BWP b of the carrier f of the serving cell c in transmission opportunity i (for example, also referred to as a parameter related to the transmission power offset, transmission power offset P0, or target reception power parameter, etc.).

[0074] M PUCCH RB，b，f，c (i) is the number of resource blocks (bandwidth) allocated to PUCCH for, for example, transmission opportunity i in the activated UL BWP b of the carrier f of the serving cell c and subcarrier spacing μ. PL b，f，c (q d ) is, for example, the index q of the reference signal (path loss reference RS, path loss reference RS for use, DL RS for path loss measurement, PUCCH - PathlossReferenceRS) used for the downlink BWP associated with the activation of UL BWP b of the carrier f of the serving cell c. d , and is the path loss calculated in the user terminal.

[0075] Δ F_PUCCH (F) is a higher layer parameter given for each PUCCH format. Δ TF，b，f，c (i) is the transmission power adjustment component (offset) for the UL BWP b of the carrier f of the serving cell c.

[0076] g b，f，c (i, l) is the value of the TPC command based on the power control adjustment status index l of the activated UL BWP of the carrier f of the serving cell c and transmission opportunity i (for example, power control adjustment status, cumulative value of the TPC command, value based on closed - loop, PUCCH power adjustment status). For example, g b，f，c (i, l) can also be represented by Equation (4).

[0077] g b，f，c (i, l) is the PUCCH power control adjustment status for the activated UL BWP b of the carrier f of the serving cell c in transmission opportunity i. For example, g b，f，c(i, l) can also be represented by Equation (4).

[0078] [Mathematical Formula 4]

[0079] Equation (4)

[0080]

[0081] Here, δ PUCCH，b，f，c (i, l) is the TPC command value, which can either be included in DCI format 1_0 or DCI format 1_1 detected by the UE in the PUCCH transmission opportunity i of the activated UL BWP b of the carrier f in the serving cell c, or can also be combined with other TPC commands in DCI format 2_2 with a CRC scrambled by a specific RNTI (Radio Network Temporary Identifier) (e.g., TPC-PUSCH-RNTI) and then encoded.

[0082] Σ m＝0 C(Ci)-1 δ PUCCH，b，f，c δ(m, l) can also be the sum of the TPC command values in the set C with a cardinality C (C i ) of TPC command values. C i can also be the set of TPC command values received by the UE between the K i (i - i0)-1 symbols before the PUCCH transmission opportunity i - i0 and the K PUCCH (i) symbols before the PUSCH transmission opportunity i in the activated UL BWP b of the carrier f in the serving cell c for the PUCCH power control adjustment state l. i0 can also be the smallest positive integer earlier than the K PUCCH (i) symbols before the PUSCH transmission opportunity i and earlier than the K PUCCH (i - i0) symbols before the PUSCH transmission opportunity i - i0. PUCCH

[0083] In the case where the PUCCH transmission responds to the detection of the UE's DCI format 1_0 or DCI format 1_1, K PUCCH (i) can also be the number of symbols in the activated UL BWP b of the carrier f in the serving cell c that is after the last symbol of the corresponding PDCCH reception and before the first symbol of this PUCCH transmission. In the case where the PUCCH transmission is set by setting the configured grant structure information (ConfiguredGrantConfig), K PUSCH (i) can also be the number of symbols N per time slot in the activated UL BWP b of the carrier f in the serving cell c​symb slot K that is equal to the product of the minimum value of the value provided through k2 in the PUSCH common structure information (PUSCH-ConfigCommon) PUCCH，min The number of symbols.

[0084] When the UE is provided with information indicating the use of two PUCCH power control adjustment states (twoPUCCH-PC-AdjustmentStates) and PUCCH spatial relation information (PUCCH-SpatialRelationInfo), l may also be {0, 1}. When the UE is not provided with information indicating the use of two PUCCH power control adjustment states or PUCCH spatial relation information, l may also be 0.

[0085] When the UE obtains the TPC command value from DCI format 1_0 or 1_1, and when the UE is provided with PUCCH spatial relation information, the UE can also obtain the mapping between the PUCCH spatial relation information ID (pucch-SpatialRelationInfoId) value and the closed-loop index (closedLoopIndex, power adjustment state index l) through the index provided by the PUCCH P0 ID (p0-PUCCH-Id in PUCCH-PowerControl in PUCCH-Config). When the UE receives an activation command containing the value of the PUCCH spatial relation information ID, the UE can also determine the value of the closed-loop index that provides the value of l through the link to the corresponding PUCCH P0 ID.

[0086] When the UE activates the UL BWP b for the carrier f of the serving cell c and is provided with P O_PUCCH，b，f，c (q u ) value setting by the higher layer, g b，f，c (i, l) = 0, k = 0, 1,..., i. When the UE is provided with PUCCH spatial relation information, the UE can also determine the value of l based on the PUCCH spatial relation information associated with the PUCCH P0 ID corresponding to q u and the closed-loop index value corresponding to l, according to the value of q u .

[0087] q u may also be the PUCCH P0 ID (p0-PUCCH-Id) representing the PUCCH P0 (P0-PUCCH) in the PUCCH P0 set (p0-Set).

[0088] In addition, the formulas (3) and (4) are only examples and are not limited thereto. The user terminal only needs to control the transmission power of the PUCCH based on at least one parameter exemplified by the formulas (3) and (4), and may include additional parameters or omit some parameters. In addition, in the above formulas (3) and (4), the transmission power of the PUCCH is controlled for each active UL BWP of a certain carrier of a certain serving cell, but is not limited thereto. At least a part of the serving cell, carrier, BWP, and power control adjustment state may also be omitted.

[0089] <Transmission Power Control for SRS>

[0090] For example, the index l of the power control adjustment state may also be used, and the transmission power (P SRS、b，f，c (i, q s , l)) of the SRS in the SRS transmission opportunity (transmission occasion) i (also referred to as the transmission period, etc.) of the active UL BWP b of the carrier f of the serving cell c is represented by the following formula (5). The power control adjustment state may also be referred to as the value of the TPC command based on the power control adjustment state index l, the cumulative value of the TPC command, or the value based on the closed loop. l may also be referred to as the closed loop index.

[0091] In addition, the SRS transmission opportunity i is the period during which the SRS is transmitted. For example, it may be composed of one or more symbols, one or more time slots, etc.

[0092] [Mathematical Formula 5]

[0093] Formula (5)

[0094]

[0095] Here, P CMAX，f，c (i) is, for example, the maximum output power of the UE for the carrier f of the serving cell c in the SRS transmission opportunity i. P O_SRS，b，f，c (q s ) is a parameter related to the target received power provided by p0 for the active UL BWP b of the carrier f of the serving cell c and the SRS resource set q s (provided by SRS-ResourceSet and SRS-ResourceSetId) (for example, also referred to as a parameter related to the transmission power offset, the transmission power offset P0, or the target received power parameter, etc.).

[0096] M SRS，b，f，cThe SRS bandwidth is indicated by the number of resource blocks of the SRS transmission opportunity i on the activated UL BWP b of the carrier f for the serving cell c and the subcarrier spacing μ.

[0097] α SRS，b，f，c (q s ) is provided by α (e.g., alpha) for the activated UL BWP b and the SRS resource set q of the carrier f for the serving cell c and the subcarrier spacing μ. s is provided by α (e.g., alpha) for the activated UL BWP b and the SRS resource set q of the carrier f for the serving cell c and the subcarrier spacing μ.

[0098] PL b，f，c (q d ) is the DL path loss estimation value [dB] calculated by the UE for the activated DL BWP of the serving cell c and the SRS resource set q s , using the RS resource index q d . The RS resource index q d is the path loss reference RS associated with the SRS resource set q s (path loss reference RS, DL RS for path loss measurement, e.g., provided by pathlossReferenceRS), and is the SS / PBCH block index (e.g., ssb-Index) or the CSI-RS resource index (e.g., csi-RS-Index).

[0099] h b，f，c (i, l) is the SRS power control adjustment state for the activated UL BWP of the carrier f of the serving cell c in the SRS transmission opportunity i. When the setting of the SRS power control adjustment state (e.g., srs-PowerControlAdjustmentStates) indicates the same power control adjustment state for SRS transmission and PUSCH transmission, it is the current PUSCH power control adjustment state f b，f，c (i, l). On the other hand, when the setting of the SRS power control adjustment state indicates independent power control adjustment states for SRS transmission and PUSCH transmission and no TPC accumulation setting is provided, the SRS power control adjustment state h b，f，c (i) can also be represented by Equation (6).

[0100] [Equation 6]

[0101] Equation (6)

[0102]

[0103] Here, δ SRS，b，f，c(m) may also be a TPC command value encoded in combination with other TPC commands within a PDCCH with DCI (e.g., DCI format 2_3). Σ m＝0 C(Si)-1 δ SRS，b，f，c (m) may also be the sum of TPC commands within a set S of TPC command values having a concentration (cardinality) C(S SRS ) received by the UE between the K SRS (i - i0)-1th symbol before the SRS transmission opportunity i - i0 and the K i (i)th symbol before the SRS transmission opportunity i on the active UL BWP b of the carrier f with subcarrier spacing μ in serving cell c. Here, i0 may also be the smallest positive integer earlier than the K i (i - i0)-1th symbol before the SRS transmission opportunity i - i0 and earlier than the K SRS (i)th symbol before the SRS transmission opportunity i. SRS (i)th symbol before the SRS transmission opportunity i.

[0104] In the case where SRS transmission is aperiodic, K SRS (i) may also be the number of symbols in the active UL BWP b of the carrier f in serving cell c that is after the last symbol of the corresponding PDCCH triggering the SRS transmission and before the first symbol of the SRS transmission. In the case where SRS transmission is semi - persistent or periodic, K SRS (i) may also be the number of symbols N per time slot in the active UL BWP b of the carrier f in serving cell c symb slot and the product of the minimum value of the value provided by k2 within the PUSCH common structure information (PUSCH - ConfigCommon). SRS，min The number of symbols.

[0105] In addition, Equations (5) and (6) are only examples and are not limited thereto. The user terminal only needs to control the transmission power of SRS based on at least one of the parameters exemplified by Equations (5) and (6), and may include additional parameters or omit some parameters. Furthermore, in the above - mentioned Equations (5) and (6), the transmission power of SRS is controlled for each BWP of a certain carrier of a certain cell, but is not limited thereto. At least a part of the cell, carrier, BWP, and power control adjustment state may also be omitted.

[0106] (UL coverage range)

[0107] In Rel.15 NR, the coverage ranges (reach distances) of PUSCH, PUCCH, PRACH, PDSCH, PDCCH, and PBCH are not equal. In particular, in high frequencies, the coverage range of PUSCH is limited. In future wireless communication systems (e.g., Rel.16, Rel.17, or later), studies are being conducted to improve at least one of the UL coverage range and UL throughput.

[0108] To expand the UL coverage range, studies are being conducted to set up receiving points in addition to general transmit-receive points. Therefore, configuration examples of general transmit-receive points and configuration examples of set-up receiving points (UL high-density configurations) will be described.

[0109] Figure 1A FIG. is a diagram showing a configuration example of a general transmit-receive point. In Figure 1A the UE receives a DL signal from the TRP and transmits a UL signal to the TRP. For example, when the distance between the UE and the TRP is long, there is a concern that the path loss is large and the communication quality deteriorates.

[0110] Figure 1B FIG. is a diagram showing a UL high-density configuration example. To expand the UL coverage range, studies are being conducted to set up receiving points in addition to the transmit-receive points as shown in Figure 1A In Figure 1B the UE receives a DL signal from the central TRP corresponding to the macro cell and transmits a UL signal to the receiving point (e.g., the receiving point closest to the UE). Figure 1B In

[0111] By using a UL high-density configuration such as Figure 1B compared to a general configuration such as Figure 1A it is possible to reduce the path loss, improve the UL signaling quality, obtain a higher coding rate, and thereby improve both the coverage range and the UL data rate. In addition, since the receiving point mainly performs reception, compared to the transmit-receive point corresponding to a general small cell, the required functions are fewer and the cost is lower.

[0112] Studies are being conducted on the sharing of the same cell ID by receiving points in the case of using a high-density configuration such as Figure 1B Regarding resource utilization in this case, for example, the following two methods are considered.

[0113] Figure 2 FIG. is a diagram showing resource utilization method A. In the example shown in Figure 2 each receiving point re-uses (recycles) resources. Specifically, multiple receiving points (UEs using the receiving point) simultaneously use the same RB. In this example, the resource utilization efficiency is high, but multi-user interference needs to be considered.

[0114] Figure 3 This is a diagram showing Resource Utilization Method B. In Figure 3 the example shown, each receiving point does not reuse (re - utilize) resources. Specifically, one RB is used for only one receiving point (the UE using that receiving point) at a certain time. In this example, the resource utilization efficiency is low, but it is simpler than the Figure 2 example and can reduce interference.

[0115] <Estimation of Path Loss>

[0116] The UE estimates the path loss (PL d (q b，f，c )) based on the resource index (q d ) of the DL RS. For example, regarding the DL RS (resource index q d ) used in the estimation of path loss, various examples such as the following (1) to (6) are considered.

[0117] (1) The path loss RS (SSB or CSI - RS) set from the network through at least one of RRC and MAC CE.

[0118] (2) The SSB for initial access (the SSB used in the acquisition of MIB). (When the path loss RS is not set)

[0119] (3) The SSB / CSI - RS corresponding to the PRACH transmission.

[0120] (4) The path loss RS mapped to the SRI field indicated by DCI.

[0121] (5) The SSB / CSI - RS corresponding to the PUCCH transmission of the PUCCH resource using the lowest index.

[0122] (6) The RS resource where the TCI state / QCL assumption of the CORESET is "QCL - TypeD" (this CORESET has the lowest index within the activated DL BWP of the serving cell's scheduling cell). Or, the RS resource with the TCI state of the activated PDSCH being "QCL - TypeD" and the lowest ID.

[0123] However, in the case where the DL RS used in the path loss estimation (calculation) is not transmitted from a high - density receiving point, the problem is how the UE estimates the path loss. In the case where the path loss cannot be appropriately estimated (determined), the transmission power cannot be appropriately determined.

[0124] Therefore, the inventors of the present invention have conceived a wireless communication method for appropriately determining the transmission power of UL signals.

[0125] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods related to the respective embodiments can be applied separately or in combination. In the present disclosure, "A / B" can also be replaced with "at least one of A and B".

[0126] In the present disclosure, a transmission and reception point, a transmission / reception point (TRP), a central TRP, a transmission and reception point, a main TRP, a transmission and reception (Tx and Rx (Tx and Rx)) cell, a transmission and reception component carrier (CC), a transmission and reception bandwidth part (BWP), a first point, a primary point, and a first base station can also be replaced with each other. In the present disclosure, a reception point, a reception point (RP), a reception (Rx) point, a high-density reception point, a distributed TRP, an additional TRP, a restrictive TRP, a reception cell, a reception CC, a reception BWP, a second point, a secondary point, and a second base station can also be replaced with each other.

[0127] The reception point can also be connected to a TRP (e.g., a base station, etc.) or a core network via wire or wireless. The reception point can also be operated as a network (NW) or a base station. The reception point can both be capable of transmitting a downlink (DL) signal and be applied to a base station forming a macro cell. For example, the reception point can also transmit a control signal / channel instead of downlink data.

[0128] The reception point may not include a part of the structure (capability, function, etc.) of the central TRP. In the reception point, the function of at least one of the transmission of DL control information, the transmission of DL data, the transmission of an SS / PBCH block, and the DL transmission may also be omitted. The number of structures of at least one of an antenna, a panel, an antenna element, and a radio frequency (RF) unit (RF chain, RF circuit) in the reception point may also be less than the number of such structures in the central TRP. The maximum transmission power of the reception point may also be lower than the maximum transmission power of the central TRP. The UE can also receive a DL signal (e.g., PDCCH, PDSCH, SS / PBCH block) from the central TRP and transmit a UL signal (e.g., PUCCH, PUSCH, SRS) based on the DL signal to the reception point.

[0129] In the present disclosure, the TRP, RS set, antenna port set, and control resource set (CORESET) set may also be interchangeable with each other.

[0130] In the present disclosure, the UL high-density configuration, distributed TRP mode, separated location mode of the transmit / receive point, distributed transmit / receive mode, separated TRP mode, TRP type 1, TRP type 2, TRP type A, and TRP type B may also be interchangeable with each other.

[0131] In the present disclosure, the SRS may also be at least one of A-SRS, P-SRS, and SP-SRS.

[0132] In the present disclosure, the path loss reference RS, path loss reference RS for PUSCH, path loss reference RS for PUCCH, path loss reference RS for SRS, SSB, CSI-RS, and RS may also be interchangeable with each other.

[0133] In the present disclosure, the path loss, path loss value, and path loss parameter may also be interchangeable with each other.

[0134] In the present disclosure, the spatial relationship, spatial relationship information, spatial relationship assumption, spatial domain transmit filter, UE spatial domain transmit filter, spatial domain filter, UE transmit beam, UL transmit beam, DL-RS, QCL assumption, SRI, and spatial relationship based on SRI may also be interchangeable with each other.

[0135] (Wireless communication method)

[0136] <First Embodiment>

[0137] The UE may also receive, via DL signaling, first information indicating a path loss (PL) used in transmission power control (TPC: Transmission Power Control), which is estimated and notified (transmitted) by the network. The DL signaling may also be at least one of high-layer signaling (e.g., RRC or MAC CE) and physical layer signaling (e.g., downlink control information (downlink control information (DCI: Downlink Control Information))).

[0138] The UE may also use the received path loss (PL b，f，c (q d)) to calculate the UL signal transmission power for a receiving point that does not transmit downlink data (e.g., the transmission power of PUSCH in Equation (1) (P PUSCH、b，f，c (i, j, q d , l)), the transmission power of PUCCH in Equation (3) (P PUCCH、b，f，c (i, q u , q d , l)), and the transmission power of SRS in Equation (5) (P SRS、b，f，c (i, q s , l)).

[0139] [Option 1] The absolute path loss (PL) value [dB] for each RS index can also be notified (sent) from the network to the UE. The UE can also directly use the notified absolute path loss value for the calculation of the transmission power.

[0140] [Option 2] The relative path loss (delta PL) value [dB] for each RS index can also be notified (sent) from the network to the UE. The UE can also use the path loss value obtained by applying (adding or subtracting) the received delta PL value to the previous path loss value estimated based on the DL RS sent from the macro cell (central TRP) for the calculation of the transmission power.

[0141] The PL value / delta PL value in Option 1 and Option 2 can also be notified / set for each index of q d / SSB / CSI-RS / SRS resource / SRS resource set. One or more RS indices and the corresponding PL value / delta PL value can also be notified via DL signaling. The PL value / delta PL value can also be replaced with a PL parameter / delta PL parameter.

[0142] Figure 4A is a diagram showing an example of the association between the RS index and the PL value. Figure 4B is a diagram showing an example of the association between the RS index and the delta PL value. The association (correspondence) between the RS index and the PL value / delta PL value is not limited to Figure 4A , Figure 4B . For example, one RS index can also correspond to multiple PL values / delta PL values. In addition, the quantization table (range and step) of the PL value / delta PL value can also be defined in advance by the specification. The notified PL value / delta PL value can also be a quantized value or the index of a quantized value.

[0143] According to the first embodiment, even without being notified of the DL RS (RS index) used in path loss estimation, the UE can calculate the transmission power using the notified PL value / delta PL value.

[0144] <Example of operation procedure>

[0145] The operation after initial access from the UE to the central TRP will be described. The central TRP may also be replaced by a central control station (Centralized Unit (CU)) / distributed node (Distribution Unit (DU)). Figure 5 It is a diagram showing an example of the operation procedure after initial access. In addition, it is assumed that either of the following (4) and (4)' is executed.

[0146] (1) The UE receives various settings / instructions from the central TRP via DL signaling (higher layer / physical layer signaling).

[0147] (2) The UE transmits SRS to the central TRP and the receiving point. At this time, the UE uses the conventional transmission power control for SRS transmission based on the DL RS from the central TRP. Alternatively, when notified of new parameters for SRS transmission power control from the network, the UE may also use new transmission power calculation.

[0148] (3) The receiving point transmits SRS reception signaling including information related to the received SRS (e.g., measurement result) to the central TRP.

[0149] (4) The central TRP performs scheduling using Figure 2 The resource utilization method A shown. At this time, the central TRP selects the receiving point for receiving UL based on the SRS. In addition, the central TRP estimates the DL path loss of the receiving point based on the SRS. The central TRP determines the PUSCH scheduling considering multi-user interference.

[0150] (4)' The central TRP performs scheduling using Figure 3 The resource utilization method B shown. The central TRP estimates the DL path loss based on the SRS jointly received by multiple receiving points. The central TRP determines the PUSCH scheduling.

[0151] (5) The central TRP transmits, via higher layer / physical layer signaling, the transmission power control parameters for each SRS index and the DCI for PUSCH transmission to the UE.

[0152] (6) The UE transmits PUSCH to the receiving point. At this time, the UE performs PUSCH power estimation using the transmission power control parameters associated with the corresponding SRS.

[0153] In addition, multiple SRSs (beams) may be configured for UL transmission. For each SRS (beam), the PL value / delta PL value may be estimated and notified to the UE. For the scheduled PUSCH transmitted via a beam, the corresponding transmission power control parameter may be used. In this case, it may be considered that the reception points of specific UL beams are fixed semi-statically. However, the reception points for receiving multiple different UL beams from the UE may be the same or different.

[0154] [Beam transmission]

[0155] Figure 6 This is an example where the UE transmits multiple beams to the same reception point. In Figure 6 the example shown, the UE transmits all four beams to one (the same) reception point (reception point 1). Figure 7 This is an example where the UE transmits multiple beams to different reception points. In Figure 7 the example shown, the UE transmits two of the four beams to reception point 1 and the remaining two to reception point 2.

[0156] Regarding which reception point receives the UL beam from the UE, it may not be recognized by the UE (it may be invisible (transparent) to the UE / not notified / configured for the UE). The network may also select a reception point suitable for the UL beam from the UE, estimate the corresponding PL value, and notify it to the UE.

[0157] [Transmission power control]

[0158] The relationship between the RS index q (q b，f，c (q d )) of the path loss (e.g., PL in equations (1), (3), (5)) and the PL value / delta PL value (e.g., d ) may also be indicated to the UE via physical layer / higher layer signaling. When the SRI designated for PUSCH transmission is associated with the RS index q, the UE may also use the PL associated with the RS index q in PUSCH power calculation. Figure 4A 、 Figure 4B )

[0159] <Second Embodiment>

[0160] The UE may also receive second information (notification / indication) from the network indicating which path loss (path loss parameter, path loss estimate) among multiple path losses is to be used, and calculate the transmission power of the UL signal using the path loss indicated by the second information.

[0161] For example, the UE can receive, via additional DL signaling, information indicating whether the UE uses a previous path loss or a new path loss, report UE capability information (UEcapability) indicating the types of path loss supported by the UE, or receive additional DL signaling indicating the type of path loss determined by the network based on the reported UE capability information. The DL signaling can be at least one of high-layer signaling (e.g., RRC or MAC CE) and physical-layer signaling (e.g., DCI). The processing of the second embodiment can also be combined with the processing of the first embodiment.

[0162] Figure 8 FIG. is an example showing the transmission of a UL signal to a receiving point. It is assumed that the UE receives from the network information indicating the use of a new path loss for SRS transmission. In Figure 8 the example shown, the UE performs transmission power control (calculation of transmission power) using the new path loss for SRS transmission. Then, the UE transmits the SRS to the receiving point through a specific beam. In addition, the UL signal transmitted to the receiving point is not limited to the SRS.

[0163] Figure 9 FIG. is an example showing the transmission of a UL signal to a central TRP. It is assumed that the UE receives from the network information indicating the use of a previous path loss for SRS transmission. In Figure 9 the example shown, SRS transmission power control (calculation of transmission power) is performed using the previous path loss estimation. Then, the UE transmits the SRS to the central TRP through a specific beam. In addition, the UL signal transmitted to the central TRP is not limited to the SRS.

[0164] For example, after performing the Figure 8 processing, when the UE receives information (indication) indicating the use of the previous path loss, the UE can also perform the Figure 9 processing.

[0165] According to the second embodiment, semi-static or dynamic UL scheduling to a central TRP (macro cell) or a receiving point can be supported.

[0166] <Third Embodiment>

[0167] As shown in the first embodiment, the UE can also receive, via DL signaling, a path loss (path loss parameter) estimated and notified (transmitted) by the network. At this time, the UE can also receive third information (at least one of RRC signaling and MAC CE) indicating the relationship (association) between one RS index and one or more path losses (PL value / delta PL value (parameter)) from the network (step 1).

[0168] Then, the UE can also receive, from the network, fourth information (at least one of a MAC CE and DCI) indicating a mapping between one RS index and one PL value / delta PL value (parameters) among the associations representing the third information (step 2).

[0169] Figure 10 FIG. is an example showing the association between the RS index notified in step 1 and multiple PL values / delta PL values. It is assumed that the UE receives, from the network, via DL signaling, the Figure 10 information shown. The beam 1 (spatial relation) used in the transmission of SRS1 is RS index 1. That is, RS index 1 corresponds to beam 1 and SRS1. Similarly, RS indices 2 and 3 correspond to beams 2 and 3, and SRS2 and 3. For example, in Figure 10 , RS index 1 is associated with PL values 1, 2, and 3.

[0170] Figure 11 FIG. is a diagram showing the correspondence between PL values and reception points. As shown in Figure 11 , it is assumed that Figure 10 PL value 1 corresponds to reception point 1, PL value 2 corresponds to reception point 2, and PL value 3 corresponds to reception point 3.

[0171] Figure 12 FIG. is a first example showing the association between the RS index notified in step 2 and one PL value / delta PL value. It is assumed that, after receiving the Figure 10 information shown, the UE receives, from the network, via DL signaling, the Figure 12 information shown. This DL signaling can be either a MAC CE for activating the SRS resource or a DCI for triggering the SRS. The UE determines one PL value / delta PL value from multiple candidates ( Figure 12 PL values / delta PL values) by being notified of the association (mapping) between the RS index and one PL value / delta PL value as shown in Figure 10 .

[0172] Figure 13 is an example of the transmission of the UL signal corresponding to Figure 12 . Corresponding to Figure 10 , Figure 11Similarly, let the PL value 1 (PLvalue1) correspond to receiving point 1, the PL value 2 (PL value2) correspond to receiving point 2, and the PL value 3 (PL value3) correspond to receiving point 3. As Figure 12 shown, the RS index 1 (RS index1) (beam 1 (beam1)) corresponds to the PL value 1 (PL value1). Therefore, the UE uses the PL value 1 (PL value1) to calculate the transmission power and uses this transmission power to send a UL signal (e.g., PUSCH) to receiving point 1 through beam 1 (beam1). Additionally, this UL signal can also be an SRS or the like.

[0173] Figure 14 FIG. is a second example showing the association between the PL / delta PL parameter and the RS index. Suppose that after the transmission shown in Figure 13 is performed, the UE receives, from the network via DL signaling, Figure 14 the information shown. This DL signaling can be either a MAC CE for activating the SRS resource or a DCI for triggering the SRS.

[0174] Figure 15 is a transmission example of the UL signal corresponding to Figure 14 Similar to Figure 10 and Figure 11 , let the PL value 1 (PLvalue1) correspond to receiving point 1, the PL value 2 (PL value2) correspond to receiving point 2, and the PL value 3 (PL value3) correspond to receiving point 3. As Figure 14 shown, the RS index 1 (RS index1) (beam 1 (beam1)) corresponds to the PL value 2 (PL value2). The UE uses the PL value 2 (PL value2) to calculate the transmission power and uses this transmission power to send a UL signal (e.g., PUSCH) to receiving point 2 through beam 1 (beam1). Additionally, this UL signal can also be an SRS or the like.

[0175] Thus, since the path loss can be changed semi-statically or dynamically, semi-static or dynamic UL scheduling between multiple receiving points can be supported.

[0176] <Fourth Embodiment>

[0177] In the fourth embodiment, an example obtained by combining the processing of the second embodiment and the processing of the third embodiment will be described.

[0178] [Option 1]

[0179] The UE can perform the processing of the third embodiment (or after performing it), and receive additional DL signaling indicating whether the previous path loss (path loss value / path loss parameter) is used by the UE or the new (newly notified) path loss (path loss parameter) is used by the UE. The UE can also report UE capability information indicating the types of path loss supported by the UE, and can also receive additional DL signaling indicating the type of path loss determined by the network based on the reported UE capability information.

[0180] [Option 2]

[0181] Similar to step 2 of the third embodiment, the UE can also receive fourth information (at least one of MAC CE and DCI) representing the mapping between one RS index and one PL value / delta PL value (parameter) from the network. In this fourth information, an RS index, and a PL value / delta PL value or "No PL Value" can also be mapped. "No PL Value" means that the UE applies the previous path loss (PL) estimation. In the case where the previous path loss estimation is applied, the UE can also send a UL signal to the central TRP.

[0182] Figure 16 It is a diagram showing a third example of the association between the PL / delta PL parameter and the RS index. Assume that the UE receives the Figure 16 information shown.

[0183] Figure 17 is related to Figure 16 corresponding UL signal transmission example. As Figure 16 shown, RS index 1 (RS index1) corresponds to "No PL value", so the UE applies the previous path loss (PL) estimation to calculate the transmission power, and uses this transmission power to send a UL signal (e.g., PUSCH) to the central TRP through beam 1 (beam1).

[0184] According to the fourth embodiment, the UE can flexibly change the transmission destination of the UL signal.

[0185] <Other>

[0186] The "RS index" in the present disclosure can also be replaced with a list / set / group / spatial-relation / QCL / TCI state of RS indices. In addition, the path loss can also be different according to different UL spatial domain filters.

[0187] The processing related to PUSCH in the present disclosure can also be similarly applied to PUCCH / SRS. For example, it can also be applied to a restricted usage method of SRS resources (SRS resource set). For example, in the usage method of SRS resource set, beam management (Beam Management (BM)) is usually the conventional TPC (used for beam scanning), and when it is set, the new path loss estimation (the processing of the present disclosure) can also be used as other usage methods.

[0188] The present disclosure can also be applied only to the case where the corresponding UE capabilities are reported. The corresponding UE capabilities can also be, for example, at least one of the following (1) to (5).

[0189] (1) Whether to support the extension of transmit power control in the present disclosure (path loss estimation).

[0190] (2) The number of supported RS indices (number of reception points).

[0191] (3) The maximum number of PL values / delta PL values set for the UE.

[0192] (4) The maximum number of PL values / delta PL values set for each RS index of the UE.

[0193] (5) Whether the extension of transmit power control in the present disclosure is applied to PUSCH / PUCCH / SRS / PRACH (capability for each UL channel: in the case where it can be further applied for SRS according to each usage method).

[0194] (Wireless communication system)

[0195] 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.

[0196] Figure 18 FIG. is an example showing 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), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0197] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0198] 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.

[0199] 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))).

[0200] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is 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 manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0201] 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).

[0202] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may also be a frequency band below 6 GHz (sub-6 GHz), and FR2 may also be a frequency band higher than 24 GHz (above-24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0203] In addition, the user terminal 20 may also communicate in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0204] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station may also be referred to as an IAB node.

[0205] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may, for example, also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0206] The user terminal 20 may also be a terminal supporting at least one of communication modes such as LTE, LTE-A, 5G, etc.

[0207] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the Downlink (DL) and the Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can also be used.

[0208] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be applied to the wireless access methods of the UL and the DL.

[0209] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. that are shared among the respective user terminals 20 can also be used.

[0210] Furthermore, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. that are shared among the respective user terminals 20 can also be used.

[0211] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, the Master Information Block (MIB) can be transmitted through PBCH.

[0212] Low-layer control information can also be transmitted through PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of PDSCH and PUSCH.

[0213] In addition, the DCI scheduling PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI 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.

[0214] In the detection of PDCCH, the Control Resource Set (CORESET) and search space can also be utilized. CORESET corresponds to the resource for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0215] One search space can also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, "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.

[0216] 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)) can also be transmitted via PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted via PRACH.

[0217] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". Further, it can also be expressed without "Physical" at the beginning of various channels.

[0218] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As the DL-RS, in the wireless communication system 1, 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. can also be transmitted.

[0219] The synchronization signal can, for example, also be 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) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. can also be referred to as reference signals.

[0220] In addition, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), it is also possible to transmit a reference signal for measurement (sounding 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).

[0221] (Base station)

[0222] Figure 19 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0223] In addition, in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can also be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0224] 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. that can be explained based on the common knowledge in the technical field related to the present disclosure.

[0225] The control unit 110 may also control the generation, scheduling (for example, resource allocation, mapping), etc. of signals. 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 path interface 140. The control unit 110 may also generate data, control information, a sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0226] 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 (also known as a phase shifter), a measurement circuit, a transmission and reception circuit, etc., which are described based on common knowledge in the technical field related to the present disclosure.

[0227] 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.

[0228] The transmission and reception antenna 130 may be composed of an antenna, such as an array antenna, which is described based on common knowledge in the technical field related to the present disclosure.

[0229] The transmission and reception unit 120 may also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission and reception unit 120 may also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0230] The transmission and reception unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0231] The transmission and reception unit 120 (transmission processing unit 1211), for example, 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 the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0232] 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.

[0233] For the baseband signal, the transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc., and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0234] On the other hand, for the radio frequency band signal received through the transmission / reception antenna 130, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc.

[0235] For the obtained baseband signal, 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., to obtain user data, etc.

[0236] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0237] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0238] 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.

[0239] The transmission / reception unit 120 may also transmit first information indicating the path loss used in transmission power control, and receive an uplink (UL) signal transmitted using the transmission power calculated based on the path loss.

[0240] The transmission / reception unit 120 may also transmit second information indicating which path loss among multiple path losses is used, and receive a UL signal transmitted using the transmission power calculated using the path loss indicated by the second information.

[0241] The transmission / reception unit 120 may also transmit third information indicating the association between the index of the reference signal and multiple path losses, and transmit fourth information indicating the mapping between one of the indexes and one of the path losses among the associations of the third information. Further, the transmission / reception unit 120 may also receive a UL signal transmitted by being determined based on the path loss according to the fourth information and calculated based on the path loss.

[0242] (User terminal)

[0243] Figure 20 FIG. is an example showing the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0244] In addition, in this example, mainly the functional blocks of the characteristic parts in the present embodiment are shown, and it can be assumed that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0245] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 may be composed of a controller, a control circuit, etc. that can be described based on the common knowledge in the technical field related to the present disclosure.

[0246] 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.

[0247] The transmission / reception unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that can be described based on the common knowledge in the technical field related to the present disclosure.

[0248] 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.

[0249] The transmitting and receiving antenna 230 can be constituted by an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna or the like.

[0250] The transmitting and receiving unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmitting and receiving unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0251] The transmitting and receiving unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0252] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0253] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform transmitting 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.

[0254] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when the transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform DFT processing as the above-mentioned transmitting processing in order to transmit the channel using the DFT-s-OFDM waveform. In the case where this is not the case, the transmitting and receiving unit 220 (transmitting processing unit 2211) can also not perform DFT processing as the above-mentioned transmitting processing.

[0255] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation to a 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.

[0256] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, etc. on the radio frequency band signal received through the transmitting and receiving antenna 230.

[0257] The transmission / reception unit 220 (reception processing unit 2212) can 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 on the obtained baseband signal, and obtain user data and the like.

[0258] The transmission / reception unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 can also measure reception power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0259] 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 and the transmission / reception antenna 230.

[0260] The transmission / reception unit 220 can also receive first information indicating the path loss used in transmission power control. In addition, the transmission / reception unit 220 can also receive second information indicating which path loss among multiple path losses is used. In addition, the transmission / reception unit 220 can also receive third information indicating the association between the index of the reference signal and multiple path losses, and receive fourth information indicating the mapping between one of the indices and one of the path losses among the associations of the third information.

[0261] The control unit 210 can also calculate the transmission power of the uplink signal, i.e., the UL signal, for the reception point where downlink data is not transmitted based on the path loss. The control unit 210 can also calculate the transmission power of the UL signal using the path loss indicated by the second information. The control unit 210 can also determine the path loss to be used based on the fourth information, and calculate the transmission power of the UL signal based on the determined path loss.

[0262] (Hardware Structure)

[0263] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a single device physically or logically combined, or can be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected with these multiple devices. A functional block can also be implemented by combining the above single device or the above multiple devices with software.

[0264] Here, in terms of functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notification, communication, forwarding, configuration (setting), reconfiguration (resetting), allocation, mapping, assignment, etc., but are not limited to these. For example, a functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0265] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 21 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 also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0266] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be mutually replaced. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the figure, or can be configured not to include some devices.

[0267] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or by other means. Further, the processor 1001 may also be implemented by one or more chips.

[0268] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage device 1003, thereby implementing the function.

[0269] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may also be composed of a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0270] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage device 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments may be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same applies to other functional blocks.

[0271] The memory 1002 may also be a computer-readable recording medium, and may be composed of, for example, at least one of a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

[0272] The storage device 1003 can also be a computer-readable recording medium, which is composed of, for example, at least one of a flexible disc, a floppy (registered trademark) disc, an optical disc (such as a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disc, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage device 1003 can also be referred to as an auxiliary storage device.

[0273] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network. For example, it is also referred to as a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), etc. can also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) can also be physically or logically separated and implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0274] The input device 1005 is an input device (such as a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (such as a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. In addition, the input device 1005 and the output device 1006 can also be of an integrated structure (such as a touch panel).

[0275] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 can be composed of a single bus or different buses can be used between each device.

[0276] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA). Part or all of the functional blocks may also be implemented using such hardware. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0277] (Variant example)

[0278] Furthermore, the terms described in this disclosure and the terms necessary for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be replaced with each other. In addition, a signal may also be a message. A Reference Signal can also be abbreviated as RS and may also be referred to as a Pilot, a pilot signal, etc. according to the applied standard. In addition, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0279] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) that make up the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of the numerology.

[0280] Here, the numerology may also refer to communication parameters applied in at least one of the transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a subcarrier spacing (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.

[0281] A time slot can also be composed of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). In addition, a time slot can also be a time unit based on a parameter set.

[0282] A time slot can also contain multiple mini-slots. Each mini-slot can also be composed of one or more 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 time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0283] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units when transmitting signals. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol can also use their respective other names. In addition, the time units such as frames, sub-frames, time slots, mini-slots, and symbols in this disclosure can also be replaced with each other.

[0284] For example, a sub-frame can also be referred to as a TTI, multiple consecutive sub-frames can also be referred to as a TTI, and a time slot or a mini-slot can also be referred to as a TTI. That is to say, at least one of a sub-frame and a TTI can be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI can also not be referred to as a sub-frame, but as a time slot, a mini-slot, etc.

[0285] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (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.

[0286] The TTI can also be the transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also become the processing unit for scheduling, link adaptation, etc. In addition, when the TTI is given, the actual time interval (such as the number of symbols) for mapping transport blocks, code blocks, codewords, etc. can also be shorter than the TTI.

[0287] In addition, when a time slot or a mini-slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-slot) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini-slots) that make up the minimum time unit of this scheduling can also be controlled.

[0288] A TTI with 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 time slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a time slot, etc.

[0289] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be replaced with a TTI having a time length 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 1 ms or more.

[0290] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB can 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.

[0291] In addition, an RB can also include one or more symbols in the time domain, and can also be the length of a time slot, a mini-slot, a subframe, or a TTI. One TTI, one subframe, etc. can also be composed of one or more resource blocks respectively.

[0292] In addition, one or more RBs can also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0293] 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 a subcarrier and a symbol.

[0294] A Bandwidth Part (BWP) (which may also be referred to as partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs can also be determined by the indices of the RBs based on the common reference point of the carrier. PRBs can also be defined in a certain BWP and be numbered additionally within that BWP.

[0295] A BWP may 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 a carrier.

[0296] At least one of the set BWPs can also be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. Additionally, in the present disclosure, "cell", "carrier", etc. can also be replaced with "BWP".

[0297] In addition, the structures such as the above-mentioned radio frames, subframes, time slots, mini-slots, and symbols are merely illustrative. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-slots included in a time slot, the symbols included in a time slot or mini-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 changed in various ways.

[0298] Furthermore, the information, parameters, etc. described in the present disclosure can be represented by absolute values, relative values with respect to a specific value, or can also be represented by corresponding other information. For example, radio resources can also be indicated by a specific index.

[0299] In the present disclosure, the names used for parameters, etc. are not restrictive names in all aspects. In addition, the mathematical formulas, etc. using these parameters can also be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus, the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0300] The information, signals, etc. described in the present disclosure can also be represented using any one of various different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0301] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0302] The information, signals, etc. that are input and output can be stored in a specific location (e.g., a memory), or can be managed using a management table. The information, signals, etc. that are input and output can 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.

[0303] The notification of information is not limited to the methods / embodiments described in this disclosure, and other methods can also be used. For example, the notification of information in this disclosure can also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher 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.

[0304] In addition, physical layer signaling can also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message, and can also be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC connection re - setting (RRC Connection Reconfiguration)) message, etc. In addition, MAC signaling can be notified, for example, using a MAC control element (MAC Control Element (CE)).

[0305] 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).

[0306] The determination can be made by a value represented by one bit (0 or 1), by a true / false value (Boolean value) represented by true or false, or by a comparison of numerical values (e.g., comparison with a specific value).

[0307] Software, whether referred to as software, firmware, middleware, micro-code, a hardware description language, or by any other name, should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, and the like.

[0308] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0309] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0310] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0311] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. There are also cases where terms such as macro cell, small cell, femto cell, pico cell, etc. are used to refer to the base station.

[0312] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole 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.

[0313] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal", etc. can be used interchangeably.

[0314] There are also cases where the mobile station is referred to by a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0315] 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 also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), 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 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.

[0316] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (e.g., which may also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various methods / embodiments of the present disclosure may also be applied. In this case, it may also be configured such that the user terminal 20 has the functions of the above-described base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0317] Similarly, the user terminal in the present disclosure may also be replaced by a base station. In this case, it may also be configured such that the base station 10 has the functions of the above-described user terminal 20.

[0318] In the present disclosure, an action performed by a base station may sometimes be performed by its upper node according to circumstances. Apparently, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0319] Each mode / embodiment described in the present disclosure may be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of each mode / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0320] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG) (where 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), systems using other appropriate wireless communication methods, next-generation systems extended based on them, and the like. In addition, multiple systems can be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0321] In the present disclosure, the description "based on", unless otherwise specified, does not mean "only based on". In other words, the description "based on" means both "only based on" and "at least based on".

[0322] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not fully define the quantity or order of these elements. These terms can be used in this disclosure as a convenient way to distinguish 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 prior to the second element in a certain form.

[0323] The term "determining" used in this disclosure may include various actions in some cases. For example, "determining" may also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structure), ascertaining, etc. are regarded as performing "determining".

[0324] In addition, "determining" may also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0325] In addition, "determining" may also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is to say, "determining" may also be a case where some actions are regarded as performing "determining".

[0326] In addition, "determining" may also be replaced by "assuming", "expecting", "considering", etc.

[0327] As used in this disclosure, terms such as "connected" and "coupled", or all variations thereof, represent all direct or indirect connections or couplings between two or more elements, and can include the case where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of them. For example, "connected" can also be replaced by "access".

[0328] In this disclosure, when two elements are connected, it is possible to consider using one or more wires, cables, printed electrical connections, etc., and electromagnetic energy having wavelengths in the radio frequency domain, microwave region, and optical (both visible and invisible) regions, etc., as several non-limiting and non-exhaustive examples, to be "connected" or "coupled" to each other.

[0329] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, this term can also mean "A and B are respectively different from C". Terms such as "separated" and "coupled" can also be interpreted in the same way as "different".

[0330] When the terms "include", "including", and their variations are used in this disclosure, these terms, like the term "comprising", are meant in an inclusive sense. Furthermore, the term "or" used in this disclosure does not mean exclusive or.

[0331] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0332] Above, the invention related to this disclosure has been described in detail, but 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 modifications 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 carry any restrictive meaning for the invention related to this disclosure.

Claims

1. A terminal, comprising: a receiving unit that receives first information indicating a path loss difference estimated by a base station and used in transmission power control; and a control unit that calculates a transmission power of an uplink signal, i.e., a UL signal, for a reception point that does not transmit a path loss reference signal based on the path loss difference, wherein the receiving unit receives second information indicating which one of a plurality of path loss differences is used, and the control unit calculates the transmission power of the UL signal using the path loss difference indicated by the second information.

2. The terminal according to claim 1, wherein the receiving unit receives third information indicating an association between an index of a reference signal and a plurality of path loss differences, and receives fourth information indicating a mapping between one of the indices and one of the path loss differences among the associations of the third information, and the control unit determines the path loss difference to be used based on the fourth information, and calculates the transmission power of the UL signal based on the determined path loss difference.

3. The terminal according to claim 1, wherein when a DL reference signal used in path loss estimation is not transmitted, the receiving unit receives the first information.

4. The terminal according to claim 2, wherein when a DL reference signal used in path loss estimation is not transmitted, the receiving unit receives the first information.

5. A wireless communication method of a terminal, comprising: a step of receiving first information indicating a path loss difference estimated by a base station and used in transmission power control; and a step of calculating a transmission power of an uplink signal, i.e., a UL signal, for a reception point that does not transmit a path loss reference signal based on the path loss difference, wherein in the step of receiving, second information indicating which one of a plurality of path loss differences is used is received, and in the step of calculating, the transmission power of the UL signal is calculated using the path loss difference indicated by the second information.

6. A base station, comprising: a transmission unit that transmits first information indicating a path loss difference estimated by the base station and used in transmission power control of a terminal; and a control unit that controls scheduling of an uplink signal, i.e., a UL signal, transmitted with a transmission power calculated based on the path loss difference, wherein the transmission power is the transmission power of the UL signal for a reception point that does not transmit a path loss reference signal, the transmission unit transmits second information indicating which one of a plurality of path loss differences is used, and the control unit controls scheduling of the UL signal with the calculated transmission power using the path loss difference indicated by the second information.

7. A system including a terminal and a base station, wherein the terminal includes: a receiving unit that receives first information indicating a path loss difference estimated by a base station and used in transmission power control; and a control unit that calculates a transmission power of an uplink signal, i.e., a UL signal, for a reception point that does not transmit a path loss reference signal based on the path loss difference, The receiving unit receives second information indicating which one of the plurality of path loss differences is used. The control unit calculates the transmission power of the UL signal using the path loss difference indicated by the second information. The base station includes: a transmitting unit that transmits the first information; and a control unit that controls the scheduling for the UL signal.

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