Terminal, base station, system and wireless communication method

Abstract

A terminal involved in one embodiment of the present invention comprises: a control unit, which uses a quasi-co-location (QCL) parameter based on a specific time slot in the spatial relationship of a sounding reference signal (SRS) resource set for antenna switching purposes when no spatial relationship information is set in the SRS resources within the SRS resource set; and a sending unit, which uses the SRS resources and the spatial relationship to send the SRS.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

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

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), a study is being conducted on controlling transmission and reception processing in a user terminal (terminal, user terminal, User Equipment (UE)) based on information related to Quasi-Co-Location (QCL).

[0009] However, how to determine the QCL parameters or reference signals used for path loss estimation in receiving downlink (DL) signals or transmitting uplink (UL) signals has not yet been determined. If the UE does not operate using appropriate QCL parameters, there is a concern that throughput may be reduced, resulting in reduced system performance.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal and a wireless communication method for appropriately determining a reference signal used in estimating a QCL parameter or a path loss.

[0011] Solutions to Solve Problems

[0012] A terminal involved in one embodiment of the present invention comprises: a control unit, which uses a quasi-co-location (QCL) parameter based on a specific time slot in the spatial relationship of a sounding reference signal (SRS) resource set for antenna switching purposes when no spatial relationship information is set in the SRS resources within the SRS resource set; and a sending unit, which uses the SRS resources and the spatial relationship to send the SRS.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, it is possible to appropriately determine a reference signal used for estimating a QCL parameter or a path loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing an example of QCL assumption for PDSCH.

[0016] Figure 2 This is a diagram showing an example of a default spatial relationship of SRS.

[0017] Figure 3 This is a diagram showing an example of a default spatial relationship of an SRS according to an embodiment.

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

[0019] Figure 5 This is a diagram showing an example of the structure of a base station involved in one embodiment.

[0020] Figure 6 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0021] Figure 7 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment. DETAILED DESCRIPTION

[0022] (Transmit Power Control)

[0023] <Transmit power control for PUSCH>

[0024] In NR, the transmission power of PUSCH is controlled based on the TPC command (also called value, increase or decrease value, correction value, etc.) represented by the value of a specific field (also called TPC command field, etc.) in DCI.

[0025] For example, when the UE uses a parameter set (open-loop parameter set) with index j and a power control adjustment state (power control adjustment state) (PUSCH power control adjustment state) with index l to transmit a PUSCH on an activated UL BWP b of a carrier f of a serving cell c, the transmission power (P) of the PUSCH in a PUSCH transmission occasion (transmission occasion) (also referred to as a transmission period, etc.) i is PUSCH，b，f，c (i,j,q d , l)) can also be represented by the following equation (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 l, the accumulated value of the TPC command, or the value based on the closed loop. l can also be referred to as the closed loop index.

[0026] Furthermore, the PUSCH transmission opportunity i is a period during which the PUSCH is transmitted, and may be composed of, for example, one or more symbols, one or more time slots, and the like.

[0027] Formula (1)

[0028]

[0029] Here, P CMAX，f，c(i) For example, it is the transmission power (also called maximum transmission power, UE maximum output power, etc.) of the user terminal set for carrier f of serving cell c at transmission opportunity i. O＿PUSCH，b，f，c (j) For example, it is a parameter related to the target reception power for the activated UL BWP b of the carrier f of the serving cell c set at the transmission opportunity i (for example, also called a parameter related to the transmission power offset, the transmission power offset P0, the target reception power parameter, etc.).

[0030] For example, it is the number of resource blocks (bandwidth) allocated to the PUSCH in the transmission opportunity i in the activated UL BWP b of the carrier f with the serving cell c and the subcarrier spacing μ. b，f，c (j) is a value provided by a higher layer parameter (e.g., also called msg3-Alpha, p0-PUSCH-Alpha, fractional factor, etc.).

[0031] PL b，f，c (q d ) is, for example, an index q of a reference signal (reference signal (RS), path loss reference RS, path loss reference RS, path loss measurement DL-RS, PUSCH-PathlossReferenceRS) for a downlink BWP associated with an activated UL BWP b of carrier f of a serving cell c. d , path loss calculated by the user terminal (path loss estimation [dB], path loss compensation).

[0032] 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 may 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 ).

[0033] In the case where the UE is configured with a number of RS resource indices up to the value of the maximum number of path loss reference RSs (e.g., maxNrofPUSCH-PathlossReferenceRS) and a set of RS configurations for RS resource indices configured by the path loss reference RS, the set of RS resource indices may also include one or both of a set of SS / PBCH block indices and a set of channel state information (CSI)-reference signal (RS) resource indices. The UE may also identify the RS resource index q within the set of RS resource indices. d .

[0034] When a PUSCH transmission is scheduled by a Random Access Response (RAR) UL grant, the UE may also use the same RS resource index q as the corresponding PRACH transmission. d .

[0035] When the UE is provided with a configuration of power control for the PUSCH based on a sounding reference signal (SRS) resource indicator (SRI) (e.g., SRI-PUSCH-PowerControl) and provided with one or more values ​​of the ID of the path loss reference RS, a mapping between a set of values ​​for the SRI field in DCI format 0_1 ​​and a set of ID values ​​for the path loss reference RS may also be obtained from higher layer signaling (e.g., sri-PUSCH-PowerControl-Id in SRI-PUSCH-PowerControl). The UE may 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 ​​for scheduling the PUSCH. d .

[0036] In the case where a PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with PUCCH spatial relation information for the PUCCH resource with the lowest index of the activated UL BWP b for each carrier f and serving cell c, the UE may also use the same RS resource index q as the PUCCH transmission within the PUCCH resource d .

[0037] In the case where PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with a spatial configuration for PUCCH transmission, or in the case where PUSCH transmission is scheduled by DCI format 0_1 ​​not including the SRI field, or in the case where the configuration for power control of the SRI-based PUSCH is not provided to the UE, the UE may also use the RS resource index q with a path loss reference RS ID of zero d .

[0038] In the case where the configured grant configuration includes a specific parameter (e.g., rrc-ConfiguredUplinkGrant) for a PUSCH transmission configured by a configured grant configuration (e.g., ConfiguredGrantConfig), the RS resource index q d It may also be provided to the UE via a path loss reference index (eg, pathlossReferenceIndex) within a specific parameter.

[0039] In the case where the setting permission configuration does not include a specific parameter for a PUSCH transmission configured by setting the permission configuration, the UE may also determine the RS resource index q based on the value of the path loss reference RS ID mapped to the SRI field in the DCI format that activates the PUSCH transmission.d In the case where the DCI format does not contain the SRI field, the UE may also determine the RS resource index q of the ID of the reference RS with zero path loss. d .

[0040] Δ TF，b，f，c (i) is a transmission power adjustment component (offset, transmission format compensation) for UL BWP b of carrier f of serving cell c.

[0041] f b，f，c (i, l) is the PUSCH power control adjustment state of the activated UL BWP b for carrier f of serving cell c in transmission opportunity i. b，f，c (i, l) can also be expressed by formula (2).

[0042] Formula (2)

[0043]

[0044] Here, δ PUSCH，b，f，c (i, l) can also be a TPC command value included in DCI format 0_0 or DCI format 0_1 of PUSCH transmission opportunity i on activated UL BWP b of carrier f that schedules service cell c, or a TPC command value encoded in combination with other TPC commands in DCI format 2_2 having a CRC encrypted with a specific RNTI (Radio Network Temporary Identifier) ​​(for example, TPC-PUSCH-RNTI).

[0045] It can also be a cardinality C(D i ) of the TPC command values ​​D i The total of the TPC command values ​​in D i It can also be the K of the UE for the PUSCH power control adjustment state l on the activated UL BWP b of the carrier f of the serving cell c and the PUSCH transmission opportunity i-i0 PUSCH (i-i0)-1 symbol ago and K of PUSCH transmission timing i PUSCH (i) The set of TPC command values ​​received between the previous symbol. i0 can also be the K of PUSCH transmission opportunity i-i0. PUSCH (i-i0) symbol before PUSCH transmission timing i K PUSCH (i) The smallest positive integer preceding a code element.

[0046] Assuming that PUSCH transmission is scheduled by DCI format 0_0 or DCI format 0_1, K PUSCH (i) It may also be the number of symbols in the activated UL BWP b of carrier f of serving cell c, which is after the last symbol received by the corresponding PDCCH and before the first symbol transmitted by the PUSCH. Assuming that PUSCH transmission is configured by configuring grant configuration information (ConfiguredGrantConfig), K PUSCH (i) It can also be K PUSCH ,min number of code elements, the K PUSCH,min The number of symbols is related to the number of symbols per time slot Nsymb in the activated UL BWP b of carrier f serving cell c slot It is equal to the product of the minimum value provided by k2 in the PUSCH common configuration information (PUSCH-ConfigCommon).

[0047] The power control adjustment state may also be set by a high-level parameter to have multiple states (e.g., two states) or a single state. In addition, when multiple power control adjustment states are set, one of the multiple power control adjustment states may also be identified by an index l (e.g., l∈{0,1}).

[0048] In addition, equations (1) and (2) are merely examples, but are not limited to them. The user terminal only needs to control the transmission power of the PUSCH based on at least one parameter illustrated in equations (1) and (2), and may include additional parameters or omit some parameters. In addition, in the above equations (1) and (2), the transmission power of the PUSCH is controlled according to each activated UL BWP of a certain carrier of a certain serving cell, but it is not limited to this. At least a part of the serving cell, carrier, BWP, and power control adjustment state may also be omitted.

[0049] <Transmit power control for PUCCH>

[0050] In addition, in NR, the transmission power of PUCCH is controlled based on the TPC command (also called value, increase or decrease value, correction value, indication value, etc.) represented by the value of a specific field (also called TPC command field, first field, etc.) within DCI.

[0051] For example, using the index l of the power control adjustment state (PUCCH power control adjustment state), the PUCCH transmission power (P PUCCH，b，f，c (i, q u ,q d , l)) can also be expressed by the following equation (3). 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 l, the accumulated value of the TPC command, or the value based on the closed loop. l can also be referred to as the closed loop index.

[0052] Furthermore, the PUCCH transmission timing i is a period during which the PUCCH is transmitted, and may be composed of, for example, one or more symbols, one or more time slots, and the like.

[0053] Formula (3)

[0054]

[0055] Here, P CMAX , f,c(i) is, for example, the transmission power (also referred to as maximum transmission power, UE maximum output power, etc.) of the user terminal set for carrier f of serving cell c at transmission opportunity i. O＿PUCCH，b，f，c (q u ) For example, it is a parameter related to the target receiving power set in the activation UL BWP b of the carrier f of the serving cell c in the sending opportunity i (for example, also called a parameter related to the sending power offset, the sending power offset P0 or the target receiving power parameter, etc.).

[0056] For example, it is the number of resource blocks (bandwidth) allocated to the PUCCH in the transmission opportunity i in the activated UL BWP b of the serving cell c and the carrier f with the subcarrier spacing μ. b，f，c (q d ) is, for example, an index q of a reference signal for a downlink BWP (path loss reference RS, path loss reference RS, path loss measurement DL-RS, PUCCH-PathlossReferenceRS) associated with an activated UL BWP b of carrier f of serving cell c. d , path loss calculated by the user terminal (path loss estimation [dB], path loss compensation).

[0057] Assume that in the case where the UE is not given a path loss reference RS (pathlossReferenceRSs), or before the UE is given dedicated higher layer parameters, the UE uses the RS resources obtained from the SS / PBCH block used by the UE to obtain the MIB to calculate the path loss PL b，f，c (q d ).

[0058] Assuming that the UE is given path loss reference RS information (pathlossReferenceRSs in PUCCH power control information (PUCCH-PowerControl)) and is not given PUCCH spatial relationship information (PUCCH-SpatialRelationInfo), the UE obtains the value of the reference signal (referencesignal) in the PUCCH path loss reference RS with the PUCCH path loss reference RS-ID (PUCCH-PathlossReferenceRS-Id) with index 0 in the PUCCH path loss reference RS information (PUCCH-PathlossReferenceRS). The resource of the reference signal is in either of the following: on the same serving cell, or if given, on the serving cell indicated by the value of the path loss reference linked information (pathlossReferenceLinking). The path loss reference linked information indicates which DL of the special cell (SpCell) and the secondary cell (SCell) corresponding to the UL the UE applies as a path loss reference. SpCell can be either a primary cell (PCell) in a master cell group (MCG) or a primary secondary cell (PSCell) in a secondary cell group (SCG). Path loss reference RS information represents a set of reference signals (e.g., CSI-RS structure or SS / PBCH block) used in PUCCH path loss estimation.

[0059] Δ F＿PUCCH (F) is a higher-layer parameter given for each PUCCH format. TF，b，f，c (i) is a transmission power adjustment component (offset) for UL BWP b of carrier f of serving cell c.

[0060] g b，f，c(i, l) is the value of the TPC command of the power control adjustment state index l based on the activated UL BWP of the carrier f of the serving cell c and the transmission opportunity i (e.g., power control adjustment state, accumulated value of TPC commands, value based on closed loop, PUCCH power adjustment state). b，f，c (i, l) can also be expressed by formula (4).

[0061] Formula (4)

[0062]

[0063] Here, δ PUCCH，b，f，c (i, l) is the TPC command value, and may also be included in the DCI format 1_0 or DCI format 1_1 detected by the UE in the PUCCH transmission timing i of the activated UL BWP b of the carrier f of the serving cell c, or encoded in combination with other TPC commands in the DCI format 2_2 having a CRC encrypted by a specific RNTI (Radio Network Temporary Identifier) ​​(for example, TPC-PUSCH-RNTI).

[0064] It can also be a cardinality C(C i ) is a set of TPC command values ​​C i The total of the TPC command values ​​in C i It can also be the K of the UE for the PUCCH power control adjustment state l, the activated UL BWP b of the carrier f of the serving cell c, and the PUCCH transmission opportunity i-i0 PUCCH (i-i0)-1 symbol ago and K of PUSCH transmission timing i PUCCH (i) The set of TPC command values ​​received between the previous symbol. i0 can also be the K of PUSCH transmission opportunity i-i0. PUCCH (i-i0) symbol before PUSCH transmission timing i K PUCCH (i) The smallest positive integer preceding a code element.

[0065] Assuming that PUCCH transmission corresponds to UE-based detection of DCI format 1_0 or DCI format 1_1, K PUCCH (i) It may also be the number of symbols in the activated UL BWP b of carrier f of serving cell c, which is after the last symbol received by the corresponding PDCCH and before the first symbol transmitted by the corresponding PUCCH. Assuming that PUCCH transmission is configured by configuring grant configuration information (ConfiguredGrantConfig), KPUSCH (i) It can also be K PUCCH,min The number of code elements, the K PUCCH,min The number of symbols is related to the number of symbols per time slot N in the activated UL BWP b of carrier f serving cell c symb slot It is equal to the product of the minimum value provided by k2 in the PUSCH common configuration information (PUSCH-ConfigCommon).

[0066] Assume that when the UE is provided with information indicating the use of two PUCCH power control adjustment states (twoPUCCH-PC-AdjustmentStates) and PUCCH spatial relationship information (PUCCH-SpatialRelationInfo), l={0, 1}; when the UE is not provided with information indicating the use of two PUCCH power control adjustment states or PUCCH spatial relationship information, l=0.

[0067] Assuming that the UE obtains the TPC command value from DCI format 1_0 or 1_1, and that the UE is provided with PUCCH spatial relationship information, the UE may also obtain the mapping between the PUCCH spatial relationship information ID (pucch-SpatialRelationInfoId) value and the closed loop index (closedLoopIndex, power adjustment state index 1) according to the index provided by the PUCCH P0 ID (p0-PUCCH-Id in p0-Set in PUCCH-PowerControl in PUCCH-Config). When the UE receives an activation command including the value of the PUCCH spatial relationship information ID, the UE may also determine the value of the closed loop index providing the value of 1 through a link to the corresponding PUCCH P0 ID.

[0068] Assume that the UE activates UL BWP b for carrier f of serving cell c, and the P O＿PUCCH，b，f，c (q u ) value is provided by the upper layer, g b，f，c (i, l) = 0, k = 0, 1, ..., i. Assuming that the UE is provided with PUCCH spatial relationship information, the UE may also be based on the corresponding u The PUCCH spatial relationship information associated with the PUCCH P0 ID and the closed-loop index value corresponding to l is obtained according to q u The value of l is determined by the value of .

[0069] q uIt may be a PUCCH P0 ID (p0-PUCCH-Id) indicating a PUCCH P0 (P0-PUCCH) within a PUCCH P0 set (p0-Set).

[0070] In addition, equations (3) and (4) are merely examples, but are not limited to them. The user terminal only needs to control the transmission power of the PUCCH based on at least one parameter illustrated in equations (3) and (4), and may include additional parameters or omit some parameters. In addition, in the above equations (3) and (4), the transmission power of the PUCCH is controlled according to each activated UL BWP of a certain carrier of a certain serving cell, but it is not limited to this. At least a part of the serving cell, carrier, BWP, and power control adjustment state may also be omitted.

[0071] <Transmit power control for SRS>

[0072] For example, using the index l of the power control adjustment state, the SRS transmission power (P SRS，b，f，c (i, q s , l)) can also be expressed by the following equation (5). 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 l, the accumulated value of the TPC command, or the value based on the closed loop. l can also be referred to as the closed loop index.

[0073] Furthermore, the SRS transmission timing i is a period during which the SRS is transmitted, and may be composed of, for example, one or more symbols, one or more time slots, and the like.

[0074] Formula (5)

[0075]

[0076] Here, P CMAX，f，c (i) is, for example, the UE maximum output power for carrier f of serving cell c at SRS transmission timing i. O＿SRS，b，f，c (q s ) is achieved by activating UL BWP b and SRS resource set q for carrier f of serving cell c s Parameters related to the target received power provided by p0 (provided through SRS-ResourceSet and SRS-ResourceSetId) (for example, also called parameters related to the transmit power offset, transmit power offset P0 or target received power parameters, etc.).

[0077] M SRS，b，f，c (i) is the SRS bandwidth represented by the number of resource blocks for SRS transmission opportunity i on activated UL BWP b for carrier f with serving cell c and subcarrier spacing μ.

[0078] α SRS，b，f，c (q s ) by activating UL BWP b and SRS resource set q for serving cell c and carrier f with subcarrier spacing μ s An α (eg, alpha) is provided.

[0079] PL b，f，c (q d ) is the activated DL BWP and SRS resource set q for serving cell c s , using RS resource index q d DL path loss estimation value [dB] calculated by UE (path loss estimation [dB], path loss compensation). RS resource index q d Is the same as SRS resource set q s The associated path loss reference RS (provided by path loss reference RS, path loss measurement DL-RS, for example, path loss reference RS (pathlossReferenceRS)) is an SS / PBCH block index (for example, ssb-Index) or a CSI-RS resource index (for example, csi-RS-Index).

[0080] It is assumed that in the case where the UE is not given path loss reference RSs, or before the UE is given dedicated higher layer parameters, the UE uses the RS resources obtained from the SS / PBCH block used by the UE to obtain the MIB to calculate the PL b，f，c (q d ).

[0081] h b，f，c (i, l) is the SRS power control adjustment state of the activated UL BWP for carrier f of serving cell c in SRS transmission opportunity i. When the SRS power control adjustment state setting (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 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 the setting of TPC integration is not provided, the SRS power control adjustment state h b，f，c(i) can also be expressed by formula (6).

[0082] Formula (6)

[0083]

[0084] Here, δ SRS，b，f，c (m) may be a TPC command value encoded in a PDCCH having DCI (eg, DCI format 2_3) in combination with other TPC commands. It can also be in the activated UL BWP b of the serving cell c and the carrier f with the subcarrier spacing μ, at the K of the SRS transmission opportunity i-i0 SRS (i-i0)-1 symbol ago and K of SRS transmission timing i SRS (i) The UE receives the signal with cardinality C(S) before the symbol. i ) is a set of TPC command values ​​S i Here, i0 may also be the K of SRS transmission timing i-i0. SRS (i-i0)-1 symbol ago than K of SRS transmission timing i SRS (i) The smallest positive integer preceding a code element.

[0085] Assuming that SRS transmission is aperiodic, K SRS (i) It may also be the number of symbols in the activated UL BWP b of carrier f of serving cell c that is after the last symbol of the corresponding PDCCH that triggers the SRS transmission and before the first symbol of the SRS transmission. Assuming that the SRS transmission is semi-persistent or periodic, K SRS (i) It can also be K SRS,min The number of code elements, the K SRS,min The number of symbols is related to the number of symbols per time slot N in the activated UL BWP b of carrier f serving cell c symb slot It is equal to the product of the minimum value provided by k2 in the PUSCH common configuration information (PUSCH-ConfigCommon).

[0086] In addition, equations (5) and (6) are merely examples, but are not limited to them. The user terminal only needs to control the transmission power of the SRS based on at least one parameter illustrated in equations (5) and (6), and may include additional parameters or omit some parameters. In addition, in the above equations (5) and (6), the transmission power of the SRS is controlled according to each BWP of a certain carrier of a certain cell, but it is not limited to this. At least part of the cell, carrier, BWP, and power control adjustment state may also be omitted.

[0087] (TCI, spatial relationship, QCL)

[0088] In NR, the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and the transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and coding) in the UE based on the transmission configuration indication state (Transmission Configuration Indication state (TCI state)), the control signal, and at least one of the channels (expressed as signal / channel) are studied.

[0089] The TCI state may also represent the state of a signal / channel applied to a downlink. The state corresponding to the TCI state applied to a signal / channel applied to an uplink may also be expressed as a spatial relation.

[0090] The TCI state refers to information related to Quasi-Co-Location (QCL) of signals / channels, and may also be referred to as spatial reception parameters, spatial relationship information, etc. The TCI state may also be set for each channel or each signal for the UE.

[0091] QCL is an indicator that indicates the statistical properties of a signal / channel. For example, when a certain signal / channel is in a QCL relationship with other signals / channels, it means that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is assumed to be the same among these different signals / channels (at least one of these is QCL).

[0092] In addition, the spatial reception parameter may also correspond to a reception beam of the UE (eg, a reception analog beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be replaced by sQCL (spatial QCL).

[0093] QCL may also be specified in multiple types (QCL types). For example, four QCL types AD may be set that are conceivably different in the same parameters (or parameter sets). The following represents the parameters (also referred to as QCL parameters):

[0094] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0095] QCL type B (QCL-B): Doppler shift and Doppler spread,

[0096] QCL Type C (QCL-C): Doppler shift and average delay,

[0097] QCL type D (QCL-D): spatial reception parameters.

[0098] The UE assumes that a specific Control Resource Set (CORESET), channel or reference signal has a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals, which can also be called QCL assumption.

[0099] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0100] The TCI state may be, for example, information related to the QCL of the target channel (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI state may also be set (indicated) by high-layer signaling, physical layer signaling, or a combination of these.

[0101] In the present disclosure, the high-layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination of these.

[0102] MAC signaling may also use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0103] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0104] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0105] In addition, the RS that is in a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called QRS).

[0106] SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)). SSB may also be referred to as an SS / PBCH block.

[0107] The information element of the TCI state set by high-level signaling ("TCI-state IE" of RRC) may also include one or more QCL information ("QCL-Info"). The QCL information may also include at least one of information related to the RS that forms a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may also include information such as the index of the RS (for example, SSB index, non-zero-power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (indicator)), the index of the cell where the RS is located, and the index of the bandwidth part (Bandwidth Part (BWP)) where the RS is located.

[0108] In Rel.15NR, as the TCI state of at least one of PDCCH and PDSCH, both QCL type A RS and QCL type D RS, or only QCL type A RS, can be set for the UE.

[0109] When TRS is set as RS of QCL type A, it is assumed that the same TRS is transmitted periodically for a long time, unlike the demodulation reference signal (DMRS) of PDCCH or PDSCH. UE can measure TRS and calculate average delay, delay spread, etc.

[0110] In the TCI state of the DMRS of the PDCCH or PDSCH, the UE to which the TRS is set as the RS of QCL type A can assume that the DMRS of the PDCCH or PDSCH is the same as the parameters of the QCL type A of the TRS (average delay, delay spread, etc.), and therefore, based on the measurement result of the TRS, the parameters of the type A of the DMRS of the PDCCH or PDSCH (average delay, delay spread, etc.) can be obtained. When the UE performs channel estimation of at least one of the PDCCH and the PDSCH, the measurement result of the TRS can be used to perform more accurate channel estimation.

[0111] A UE to which a QCL type D RS is set can use the QCL type D RS to determine a UE reception beam (spatial reception filter, UE spatial reception filter).

[0112] The RS of QCL type X in the TCI state may also mean an RS that has a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0113] <TCI status for PDCCH>

[0114] The information related to the PDCCH (or the DMRS antenna port associated with the PDCCH) and the QCL of a specific RS may also be referred to as the TCI state for the PDCCH, etc.

[0115] The UE may also determine the TCI state for the UE-specific PDCCH (CORESET) based on higher layer signaling. For example, for the UE, one or more (K) TCI states may be set for each CORESET through RRC signaling.

[0116] The UE may also activate one of the multiple TCI states set by RRC signaling for each CORESET through MAC CE. The MAC CE may also be called a UE-specific PDCCH TCI state indication MAC CE (TCI State Indicationfor UE-specific PDCCH MAC CE). The UE may also monitor the CORESET based on the activated TCI state corresponding to the CORESET.

[0117] <TCI status for PDSCH>

[0118] Information related to the PDSCH (or the DMRS antenna port associated with the PDSCH) and the QCL of a specific DL-RS may also be referred to as the TCI state for the PDSCH, etc.

[0119] The UE may also be notified (set) of M (M≥1) TCI states for PDSCH (QCL information for M PDSCHs) through high-layer signaling. In addition, the number M of TCI states set for the UE may also be limited by at least one of the UE capability and the QCL type.

[0120] The DCI used in the scheduling of the PDSCH may also include a specific field indicating the TCI state for the PDSCH (for example, it may also be referred to as a TCI field, a TCI state field, etc.). The DCI may also be used in the scheduling of the PDSCH of a cell, for example, it may also be referred to as DL DCI, DL allocation, DCI format 1_0, DCI format 1_1, etc.

[0121] Whether the TCI field is included in the DCI may also be controlled by information notified from the base station to the UE. The information may also be information indicating whether the TCI field exists (present or absent) in the DCI (e.g., TCI presence information, TCI presence information in DCI, high-layer parameter TCI-PresentInDCI). The information may also be set to the UE through high-layer signaling, for example.

[0122] When more than 8 TCI states are set for the UE, MAC CE can also be used to activate (specify) less than 8 TCI states. The MAC CE can also be called UE-specific PDSCH TCI state activation / deactivation MAC CE (TCIStates Activation / Deactivation for UE-specific PDSCH MAC CE). The value of the TCI field in the DCI can also represent one of the TCI states activated by the MAC CE.

[0123] When the UE has TCI existence information set to "activated (enabled)" for the CORESET that schedules PDSCH (the CORESET used in the PDCCH transmission that schedules PDSCH), the UE may also assume that the TCI field exists in the DCI format 1_1 of the PDCCH transmitted on the CORESET.

[0124] When TCI existence information is not set for the CORESET that schedules the PDSCH, or the PDSCH is scheduled through DCI formats 1_0, when the time offset between the reception of DL DCI (DCI that schedules the PDSCH) and the reception of the PDSCH corresponding to the DCI is greater than a threshold, the UE may also assume that: in order to determine the QCL of the PDSCH antenna port, the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption applied to the CORESET used in the PDCCH transmission that schedules the PDSCH.

[0125] When TCI presence information is set to "activated (enabled)", when the TCI field in the DCI in the component carrier (CC) of the scheduling (PDSCH) indicates the activated TCI state in the scheduled CC or DL ​​BWP, and the PDSCH is scheduled by DCI format 1_1, the UE may also use the TCI with DCI and according to the value of the TCI field in the detected PDCCH in order to determine the QCL of the PDSCH antenna port. When the time offset between the reception of the DL DCI (scheduling the PDSCH) and the PDSCH corresponding to the DCI (the PDSCH scheduled by the DCI) is greater than the threshold, the UE may also assume that the DM-RS port of the PDSCH of the serving cell is the RS and QCL in the TCI state related to the QCL type parameter given by the indicated TCI state.

[0126] In the case where the UE is set to a single time slot PDSCH, the indicated TCI state may also be based on the activated TCI state in the time slot with the scheduled PDSCH. In the case where the UE is set to multiple time slot PDSCHs, the indicated TCI state may also be based on the activated TCI state in the initial time slot with the scheduled PDSCH, and the UE may also expect it to be the same in the time slot with the scheduled PDSCH. In the case where the UE is set to a CORESET associated with a search space set for cross-carrier scheduling, the UE sets the TCI existence information to "activated" for the CORESET, and when at least one of the TCI states set for the service cell scheduled by the search space set includes QCL type D, the UE may also assume that the time offset between the detected PDCCH and the PDSCH corresponding to the PDCCH is greater than the threshold.

[0127] In RRC connected mode, in both the case where the TCI information in the DCI (high-layer parameter TCI-PresentInDCI) is set to "activated (enabled)" and the case where the TCI information in the DCI is not set, when the time offset between the reception of the DL DCI (DCI scheduling the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is less than a threshold, the UE may also assume that the DM-RS port of the PDSCH of the serving cell is an RS and a QCL, wherein the RS and the QCL have the smallest (lowest) CORESET-ID in the latest (most recent) time slot monitored by the UE for one or more CORESETs within the activated BWP of the serving cell, and are related to the QCL parameters used in the QCL indication of the PDCCH of the CORESET associated with the monitored search space (monitored search space) ( Figure 1 ). This RS may also be referred to as the default TCI state of the PDSCH or the default QCL assumption of the PDSCH.

[0128] The time offset between the reception of DL DCI and the reception of the PDSCH corresponding to the DCI may also be referred to as a scheduling offset.

[0129] In addition, the above-mentioned threshold may also be referred to as time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", scheduling offset threshold, scheduling offset threshold, etc.

[0130] The QCL time length may also be based on UE capabilities, for example, based on the delay required for decoding of the PDCCH and beam switching. The QCL time length may also be the minimum time required by the UE for PDCCH reception and application of spatial QCL information received in the DCI for PDSCH processing. The QCL time length may be represented by the number of symbols per subcarrier spacing or by time (e.g., μs). The information on the QCL time length may be reported from the UE to the base station as UE capability information or may be set from the base station to the UE using high-layer signaling.

[0131] For example, the UE may also assume that the DMRS port of the PDSCH is based on the DL-RS and QCL of the TCI state activated for the CORESET corresponding to the smallest CORESET-ID. The latest time slot may also be, for example, a time slot for receiving the DCI scheduling the PDSCH.

[0132] Alternatively, CORESET-ID may be an ID (an ID for identifying CORESET) set by the RRC information element “ControlResourceSet”.

[0133] After Rel.16, when the PDSCH and the PDCCH that schedules it are in different component carriers (CC) (cross-carrier scheduling), assuming that the delay from PDCCH to PDSCH (PDCCH-to-PDSCHdelay) is shorter than the time length for QCL, or assuming that there is no TCI state in the DCI used for the scheduling, the UE can also obtain the QCL assumption for the scheduled PDSCH that can be applied in the PDSCH within the activated BWP of the scheduled cell and from the activated TCI state with the lowest ID.

[0134] <Spatial relationship for PUCCH>

[0135] The UE may also be configured with parameters (PUCCH configuration information, PUCCH-Config) used in PUCCH transmission through higher-layer signaling (e.g., Radio Resource Control (RRC) signaling). The PUCCH configuration information may also be configured for each partial bandwidth (e.g., uplink bandwidth part (Bandwidth Part (BWP))) within a carrier (also referred to as a cell, component carrier (CC)).

[0136] The PUCCH configuration information may also include a list of PUCCH resource set information (eg, PUCCH-ResourceSet) and a list of PUCCH spatial relationship information (eg, PUCCH-SpatialRelationInfo).

[0137] The PUCCH resource set information may also include a list (eg, resourceList) of PUCCH resource indices (IDs, eg, PUCCH-ResourceId).

[0138] In addition, when the UE does not have dedicated PUCCH resource setting information (e.g., dedicated PUCCH resource configuration) provided by PUCCH resource set information in PUCCH setting information (before establishing RRC), the UE may also determine the PUCCH resource set based on parameters (e.g., pucch-ResourceCommon) in system information (e.g., system information block type 1 (SystemInformation Block Type1(SIB1)) or minimum system information (Remaining Minimum SystemInformation(RMSI)). The PUCCH resource set may also include 16 PUCCH resources.

[0139] On the other hand, when the UE has the above-mentioned dedicated PUCCH resource setting information (UE-dedicated uplink control channel structure, dedicated PUCCH resource structure) (after establishing RRC), the UE can also determine the PUCCH resource set according to the number of UCI information bits.

[0140] The UE may also select a PUCCH resource indicator based on the value of a specific field (e.g., a PUCCH resource indicator field) in the downlink control information (downlink control information (DCI)) (e.g., DCI format 1_0 or 1_1 used in the scheduling of the PDSCH), the number of CCEs (N) in the control resource set (COntrol REsource SET (CORESET)) for receiving the PDCCH that transmits the DCI, and the number of CCEs (N) in the control resource set (COntrol REsource SET (CORESET)). CCE ), the index of the first (initial) CCE received by the PDCCH (n CCE，0 ) determines at least one of the PUCCH resources (index) within the above-mentioned PUCCH resource set (for example, a PUCCH resource set that is cell-specific or determined individually for the UE).

[0141] The PUCCH spatial relationship information (eg, "PUCCH-spatialRelationInfo" of the RRC information element) may also indicate multiple candidate beams (spatial filters) for PUCCH transmission. The PUCCH spatial relationship information may also indicate the spatial relationship between RS (reference signal) and PUCCH.

[0142] The list of PUCCH spatial relationship information may also include several elements (PUCCH spatial relationship information IE (Information Element)). Each PUCCH spatial relationship information may also include, for example, at least one of the information related to the index of the PUCCH spatial relationship information (ID, for example, pucch-SpatialRelationInfoId), the index of the serving cell (ID, for example, servingCellId), and the RS (reference RS) with which the PUCCH forms a spatial relationship.

[0143] For example, the information related to the RS may also be an SSB index, a CSI-RS index (e.g., an NZP-CSI-RS resource structure ID), or an SRS resource ID and an ID of a BWP. The SSB index, the CSI-RS index, and the SRS resource ID may also be associated with at least one of the beam, resource, and port selected by measuring the corresponding RS.

[0144] When more than one spatial relation information related to the PUCCH is set, the UE may perform control based on the PUCCH spatial relation Activation / Deactivation MAC CE so that one PUCCH spatial relation information becomes active with respect to one PUCCH resource at a certain time.

[0145] The PUCCH spatial relationship activation / deactivation MAC CE of Rel-15 NR is expressed by a total of three octets (8 bits×3=24 bits) of octets (Octet, Oct) 1-3.

[0146] The MAC CE may also include information such as the serving cell ID ("Serving Cell ID" field) of the application object, the BWP ID ("BWP ID" field), and the PUCCH resource ID ("PUCCH Resource ID" field).

[0147] In addition, the MAC CE contains "S i ”(i=0-7) field. i When the field indicates 1, the UE activates the spatial relationship information of the spatial relationship information ID#i. i When the field indicates 0, the UE deactivates the spatial relationship information of the spatial relationship information ID#i.

[0148] The UE may activate the PUCCH spatial relationship information specified by the MAC CE 3 ms after sending a positive acknowledgement (ACK) for activating specific PUCCH spatial relationship information.

[0149] <Spatial relationship between SRS and PUSCH>

[0150] The UE may also receive information (SRS configuration information, for example, parameters in "SRS-Config" of the RRC control element) used in transmitting a measurement reference signal (for example, a sounding reference signal (SRS)).

[0151] Specifically, the UE may also receive at least one of information related to one or more SRS resource sets (SRS resource set information, for example, "SRS-ResourceSet" of the RRC control element) and information related to one or more SRS resources (SRS resource information, for example, "SRS-Resource" of the RRC control element).

[0152] An SRS resource set may also be associated with a specific number of SRS resources (or the specific number of SRS resources may be grouped). Each SRS resource may also be identified by an SRS resource identifier (SRS Resource Indicator (SRI)) or an SRS resource ID (Identifier).

[0153] The SRS resource set information may also include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type, and information on the usage of the SRS.

[0154] Here, the SRS resource type may also represent any one of periodic SRS (Periodic SRS (P-SRS)), semi-persistent SRS (Semi-Persistent SRS (SP-SRS)), and aperiodic SRS (Aperiodic SRS (A-SRS, AP-SRS)). In addition, the UE may also periodically (or periodically after activation) send P-SRS and SP-SRS, and send A-SRS based on the SRS request of the DCI.

[0155] In addition, the purpose (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management, codebook-based transmission (codebook: CB), non-codebook-based transmission (nonCodebook: NCB), antenna switching, etc. The SRS for codebook-based transmission or non-codebook-based transmission may also be used in the decision of the precoder for codebook-based or non-codebook-based PUSCH transmission based on SRI.

[0156] For example, the UE may determine the precoder for PUSCH transmission based on SRI, Transmitted Rank Indicator (TRI) and Transmitted Precoding Matrix Indicator (TPMI) in case of codebook-based transmission. The UE may determine the precoder for PUSCH transmission based on SRI in case of non-codebook-based transmission.

[0157] SRS resource information may also include SRS resource ID (SRS-ResourceId), SRS port number, SRS port number, sending comb, SRS resource mapping (for example, time and / or frequency resource location, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), jump association information, SRS resource type, sequence ID, SRS spatial relationship information, etc.

[0158] The spatial relationship information of SRS (e.g., "spatialRelationInfo" of the RRC information element) may also indicate the spatial relationship information between a specific reference signal and SRS. The specific reference signal may also be at least one of a synchronization signal / broadcast channel (Synchronization Signal / Physical Broadcast Channel: SS / PBCH) block, a channel state information reference signal (CSI-RS), and an SRS (e.g., other SRS). The SS / PBCH block may also be referred to as a synchronization signal block (SSB).

[0159] The spatial relationship information of SRS may also include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the above-mentioned specific reference signal.

[0160] In addition, in the present disclosure, SSB index, SSB resource ID and SSBRI (SSB resource identifier (SSB Resource Indicator)) can also be replaced with each other. In addition, CSI-RS index, CSI-RS resource ID and CRI (CSI-RS resource identifier (CSI-RS Resource Indicator)) can also be replaced with each other. In addition, SRS index, SRS resource ID and SRI can also be replaced with each other.

[0161] The spatial relationship information of the SRS may also include a serving cell index, a BWP index (BWP ID), etc. corresponding to the above-mentioned specific reference signal.

[0162] In NR, the transmission of uplink signals can also be controlled based on the presence or absence of beam correlation (Beam Correspondence (BC)). BC can also refer to the ability of a node (e.g., a base station or UE) to determine the beam (transmit beam, Tx beam) used in signal transmission based on the beam (receive beam, Rx beam) used in signal reception.

[0163] In addition, BC can also be called transmit / receive beam correlation (Tx / Rx beam correspondence), beam reciprocity (beam reciprocity), beam calibration (beam calibration), calibrated / non-calibrated (Calibrated / Non-calibrated), reciprocity calibrated / non-calibrated (reciprocity calibrated / non-calibrated), correspondence, consistency, etc.

[0164] For example, in the absence of BC, the UE may also send uplink signals (e.g., PUSCH, PUCCH, SRS, etc.) based on the measurement results of more than one SRS (or SRS resources) using the same beam (spatial transmit filter) as the SRS (or SRS resources) indicated from the base station.

[0165] On the other hand, in the case of BC, the UE may also send uplink signals (e.g., PUSCH, PUCCH, SRS, etc.) using a beam (spatial transmit filter) that is the same as or corresponds to the beam (spatial receive filter) used in the reception of a specific SSB or CSI-RS (or CSI-RS resource).

[0166] The UE may also transmit the SRS resource using the same spatial filter (spatial transmit filter) as the spatial filter (spatial receive filter) used for receiving the SSB or CSI-RS when spatial relationship information related to the SSB or CSI-RS and the SRS is set for a certain SRS resource (for example, with BC). In this case, the UE may also assume that the UE receive beam of the SSB or CSI-RS is the same as the UE transmit beam of the SRS.

[0167] The UE may also transmit the target SRS resource using the same spatial filter (spatial transmission filter) as the spatial filter (spatial transmission filter) used for transmitting the reference SRS, when spatial relationship information related to other SRS (reference SRS) and the SRS (target SRS) is set for a certain SRS (target SRS) resource (for example, when there is no BC). That is, in this case, the UE may also assume that the UE transmission beam of the reference SRS is the same as the UE transmission beam of the target SRS.

[0168] The UE may also determine the spatial relationship of the PUSCH scheduled by the DCI based on the value of a specific field (e.g., SRS resource identifier (SRI) field) in the DCI (e.g., DCI format 0_1). Specifically, the UE may also use the spatial relationship information of the SRS resource determined based on the value of the specific field (e.g., SRI) in the PUSCH transmission (e.g., "spatialRelationInfo" of the RRC information element).

[0169] In the case of codebook-based transmission for PUSCH, the UE may also be configured with two SRS resources through RRC and be indicated with one of the two SRS resources through DCI (a one-bit specific field). In the case of non-codebook-based transmission for PUSCH, the UE may also be configured with four SRS resources through RRC and be indicated with one of the four SRS resources through DCI (a two-bit specific field). In order to use a spatial relationship other than the two or four spatial relationships configured by RRC, RRC reconfiguration is required.

[0170] In addition, DL-RS can be configured for the spatial relationship of SRS resources used in PUSCH. For example, for SP-SRS, the UE can be configured with the spatial relationship of multiple (eg, up to 16) SRS resources through RRC, and one of the multiple SRS resources can be indicated through MAC CE.

[0171] (Spatial relationship of PUSCH scheduled by DCI format 0_0)

[0172] DCI format 0_1 ​​includes SRI, but DCI format 0_0 does not include SRI.

[0173] In Rel.15NR, for a PUSCH on a cell scheduled via DCI format 0_0, if the UE is able to use it, the PUSCH is sent according to the spatial relationship corresponding to the dedicated PUCCH resource with the lowest ID within the activated UL BWP of the cell. The dedicated PUCCH resource can also be a PUCCH resource that is configured individually for the UE (configured by the high-level parameter PUCCH-Config).

[0174] Therefore, for a cell in which PUCCH resources are not configured (eg, a secondary cell (SCell)), PUSCH cannot be scheduled using DCI format 0_0.

[0175] When PUCCH on SCell is not configured (PUCCH transmitted on SCell), UCI is transmitted on PCell. When PUCCH on SCell is configured, UCI is transmitted on PUCCH-SCell. Therefore, PUCCH resources and spatial relationship information do not need to be configured for all SCells, and there may be cells where PUCCH resources are not configured.

[0176] In addition, DCI format 0_1 ​​includes a carrier indicator (carrier indicator field (CIF)), but DCI format 0_0 does not include CIF. Therefore, even if PUCCH resources are set for PCell, cross-carrier scheduling of PUSCH on SCell cannot be performed through DCI format 0_0 on PCell.

[0177] (Default spatial relationship)

[0178] For UEs supporting beam correlation, assuming that within a certain frequency range (for example, frequency range (FR) 2), in the case where no spatial relationship information for a dedicated PUCCH setting or a dedicated SRS setting is set except for the SRS with beam management purpose (usage = 'beamManagement'), a default spatial relationship can also be applied to the dedicated PUCCH setting or the dedicated SRS setting.

[0179] For UEs that do not support beam correlation, assuming that within a certain frequency range (e.g., FR2), when no spatial relationship information for a dedicated PUCCH setting or a dedicated SRS setting is set except for the SRS for beam management purposes, a default spatial relationship can also be applied to the dedicated PUCCH setting or the dedicated SRS setting.

[0180] For example, the default spatial relationship may also be the default TCI state or the default QCL assumption of the PDSCH.

[0181] (SRS resource set for antenna switching)

[0182] The UE uses the SRS resources in the SRS-ResourceSet with antenna switching usage (usage = 'antennaSwitching') for repeated transmission. For example, the UE repeatedly transmits multiple SRS resources in the SRS-ResourceSet with antenna switching usage. Such repeated transmission of SRS is used in the determination of DL precoder. If different spatial relationships are applied to the repeated transmission of SRS, the base station cannot appropriately determine the DL precoder. Therefore, the same spatial relationship should be applied to the repeated transmission of SRS.

[0183] However, it is assumed that, in the case where the UE transmits an SRS for antenna switching in multiple time slots and applies a default spatial relationship in the SRS, the default spatial relationship is different in each time slot. Figure 2 As shown, when the UE transmits SRS1 and SRS2 in multiple time slots, the default spatial relationship of SRS1 in a certain time slot is TCI1 of CORESET1, and the default spatial relationship of SRS2 in other time slots is TCI2 of CORESET2. In this way, if a different spatial relationship is applied to the repeated transmission of SRS for antenna switching, the base station cannot appropriately determine the DL precoder. If the DL precoder is not appropriately determined, there is a concern that system performance such as a decrease in throughput may be reduced.

[0184] (When the path loss reference signal is not set)

[0185] As described above, assuming that the UE is not given a path loss reference RS (pathlossReferenceRSs) or before the UE is given dedicated higher-layer parameters, the UE can also use the RS resources obtained from the SS / PBCH block used by the UE to obtain the MIB in path loss estimation (path loss calculation).

[0186] However, consider the case where the SS / PBCH block is not transmitted in a specific cell (e.g., SCell), and the case where there is no SS / PBCH block for the UE to obtain the MIB in the specific cell. In these cases, it is considered that the RS used in the path loss estimation cannot be properly determined. If the RS used in the path loss estimation cannot be properly determined, there is a concern that the system performance will be reduced, such as the reduction in throughput.

[0187] Therefore, the inventors of the present invention have conceived a method of appropriately determining the spatial relationship.

[0188] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0189] In the present disclosure, spatial relationship, spatial relationship information, spatial relationship assumption, spatial domain transmit filter, UE spatial domain transmit filter, spatial domain filter, UE transmit beam, UL signal beam, UL precoding, UL precoder, RS of spatial relationship, DL-RS, QCL assumption, SRI, SRI-based spatial relationship, and UL TCI can also be replaced with each other.

[0190] TCI state, TCI state or QCL assumption, QCL assumption, spatial reception filter, UE spatial reception filter, spatial filter, UE reception beam, DL reception beam, DL precoding, DL precoder, DL-RS can also be replaced with each other. RS of QCL type D, DL-RS associated with QCL type D, DL-RS with QCL type D, source of DL-RS, SSB, CSI-RS can also be replaced with each other.

[0191] In the present disclosure, the TCI state may also be information related to the receive beam (spatial receive filter) indicated (set) to the UE (e.g., DL-RS, QCL type, cell to which the DL-RS is transmitted, etc.). The QCL assumption may also be information related to the receive beam (spatial receive filter) assumed by the UE based on the transmission or reception of an associated signal (e.g., PRACH) (e.g., DL-RS, QCL type, cell to which the DL-RS is transmitted, etc.).

[0192] In the present disclosure, cell, CC, carrier, BWP, and frequency band may be used interchangeably.

[0193] In the present disclosure, index, ID, indicator, and resource ID may also be interchangeable.

[0194] In the present disclosure, specific UL signals, specific types of UL signals, specific UL signals, specific UL channels, PUSCH, PUCCH, SRS, P-SRS, SP-SRS, and A-SRS may also be replaced with each other. In the present disclosure, specific DL signals, specific types of DL signals, specific DL reception, specific DL channels, PDSCH, PDCCH, CORESET, DL-RS, SSB, and CSI-RS may also be replaced with each other.

[0195] In the present disclosure, "UE sends a specific UL signal according to the default spatial relationship", "UE uses the default spatial relationship in the spatial relationship of the specific UL signal", "UE assumes (regards) that the spatial relationship of the specific UL signal is the same as the RS of the default spatial relationship", and "UE assumes (regards) that the spatial relationship of the specific UL signal is the same as the RS of QCL type D of the default spatial relationship" can also be replaced by each other.

[0196] In the present disclosure, the default spatial relationship, the default spatial relationship assumption, the TCI state or QCL assumption of a specific DL signal, the RS related to the QCL parameters given by the TCI state or QCL assumption of a specific DL signal, the RS of QCL type D in the TCI state or QCL assumption of a specific DL signal, the spatial relationship of the reference UL signal, the specific RS, the specific DL RS, and the first reference signal may also be replaced with each other.

[0197] In the present disclosure, the latest time slot and the most recent time slot may also be replaced with each other.

[0198] In the present disclosure, TRS, tracking CSI-RS, CSI-RS with TRS information (higher layer parameter trs-Info), and NZP-CSI-RS resources in an NZP-CSI-RS resource set with TRS information may also be replaced with each other.

[0199] In the present disclosure, DCI format 0_0 may also be replaced by DCI not including SRI, DCI not including indication of spatial relationship, and DCI not including CIF. In the present disclosure, DCI format 0_1 ​​may also be replaced by DCI including SRI, DCI including indication of spatial relationship, and DCI including CIF.

[0200] The path loss reference RS and the path loss reference RS can also be replaced with each other.

[0201] (Wireless Communication Method)

[0202] <Default spatial relationship application conditions>

[0203] When the following application conditions are met, the UE may also apply the default spatial relationship in the spatial relationship of a specific UL signal. The specific UL signal may also be at least one of PUSCH, PUCCH, SRS, P-SRS, SP-SRS, and A-SRS.

[0204] The application conditions may also include that the spatial relationship information for the specific UL signal is not set, the specific UL signal is within a frequency range (e.g., frequency range (FR) 2), the specific UL signal is based on a dedicated PUCCH setting or a dedicated SRS setting other than an SRS with a beam management purpose (usage = 'beamManagement') and an SRS with a non-codebook-based transmission purpose (usage = 'nonCodebook') including a setting with an associated CSI-RS (associatedCSI-RS), and the UE supports at least one of beam correlation. The spatial relationship information for the specific UL signal may also be the spatial relationship information within a dedicated PUCCH setting or a dedicated SRS setting. The associated CSI-RS may also be the ID (index) of a CSI-RS resource associated with an SRS resource set in a non-codebook-based transmission.

[0205] The application condition may also include that the path loss reference RS is not configured for the specific UL signal. The application condition may also include that the path loss reference RS is not configured for the specific UL signal through higher layer signaling.

[0206] The application condition may also include that only one TCI state is activated for the PDCCH (the number of activated TCI states for the PDCCH is 1). According to this application condition, the UE operation becomes simple.

[0207] The application condition may also include that only one TCI state is activated for PDCCH and PDSCH (the number of activated TCI states for PDCCH and PDSCH is 1). When a single activated beam is used for UL and DL, UE operation becomes simple.

[0208] The application conditions may also include that the PDCCH and the PUCCH scheduled by the PDCCH are in the same BWP or the same CC (cross-carrier scheduling is not used). In the case of cross-carrier scheduling, the UE is not limited to being able to apply the same beam in the PDCCH and the PUCCH, so by excluding cross-carrier scheduling, the UE operation becomes simple. For example, consider the case of inter-band carrier aggregation (CA), where different beams are applied in the PDCCH and the PUCCH. In addition, for example, consider the case of FR1-FR2 CA, if the DCI is in FR1 and the PUCCH or SRS or PUSCH is in FR2, the UE cannot determine the beam.

[0209] The application condition may also include not using inter-band CA.

[0210] The application condition may include that there is no SRI for the specific UL signal PUSCH. The application condition may include that there is no SRS resource corresponding to the SRI for PUSCH.

[0211] <Default spatial relationship>

[0212] The default spatial relationship may also be a default TCI state or a default QCL assumption for a particular DL signal.

[0213] The default TCI state or default QCL assumption for a particular DL signal, with the lowest CORESET in the most recent time slot The TCI state of the CORESET with ID, the RS related to the QCL parameters used in the QCL indication of the PDCCH of the CORESET with the lowest CORESET-ID in the latest time slot monitored by the UE and associated with the monitored search space of one or more CORESETs within the activated BWP of the serving cell, the TCI state or QCL assumption of the CORESET with the lowest CORESET-ID in the latest time slot and associated with the monitored search space, the TCI state or QCL assumption of the CORESET with the lowest CORESET-ID in a specific time slot and associated with the monitored search space, the TCI state or QCL assumption of a specific CORESET, the TCI state or QCL assumption of a DL signal corresponding to a specific UL signal (for example, a DL channel that triggers a specific UL signal, a DL channel that schedules a specific UL signal, and a DL channel that schedules a DL channel corresponding to a specific UL signal), and the RS related to the QCL parameters of a specific DL signal (as an RS for a specific DL signal and QCL) can also be replaced with each other.

[0214] The latest time slot may also be the latest time slot for a specific DL signal. The latest time slot may also be the latest time slot of the starting symbol of a specific UL signal (or before the symbol). The latest time slot may also be the latest time slot of the first or last symbol of the DL signal corresponding to the specific UL signal (before the symbol). For example, in the case where the specific UL signal is PUCCH, the DL signal corresponding to the specific UL signal may also be the PDSCH corresponding to the PUCCH (the PDSCH corresponding to the HARQ-ACK transmitted on the PUCCH).

[0215] The specific UL signal may also be a PUSCH scheduled through DCI format 0_0. For example, the specific UL signal may also be a PUSCH on the cell scheduled through DCI format 0_0 when a PUCCH resource (e.g., dedicated PUCCH resource) with a spatial relationship (e.g., an activated spatial relationship) is not set within the activated UL BWP of the cell.

[0216] The default spatial relationship may also be any one of the following default spatial relationships 1 to 5.

[0217] 《Default Spatial Relationship 1》

[0218] The default spatial relationship may also be the default TCI state or the default QCL assumption for PDSCH.

[0219] The default spatial relationship may also be the default TCI state of PDSCH or the default QCL assumption of PDSCH. When CORESET is set on the CC to which the default spatial relationship is applied, the default TCI state of PDSCH or the default QCL assumption of PDSCH may also be the TCI state corresponding to the lowest CORESETID of the most recent time slot or the most recent search space. When no CORESET is set on the CC to which the default spatial relationship is applied, the default TCI state of PDSCH or the default QCL assumption of PDSCH may also be the activated TCI state that can be applied in the PDSCH within the activated DL BWP of the CC and has the lowest ID.

[0220] The specific DL signal may also be PDSCH.

[0221] Default Spatial Relationship 2

[0222] The default spatial relationship can also be one of the activated TCI states (activated TCI states) of the CORESET.

[0223] For CORESET, multiple TCI states may also be active. In this case, the active TCI state selected as the default spatial relationship may be either the default RS, the default TCI state, or the default QCL assumption.

[0224] The specific DL signal may also be a PDCCH.

[0225] Default Spatial Relationship 3

[0226] In the case where a specific UL signal corresponds to a PDCCH (in the case where a specific UL signal is scheduled or triggered by a PDCCH (DL DCI) for scheduling a PDSCH), the default spatial relationship of the specific UL signal may also be the TCI state of the PDCCH. The specific UL signal may be either an A-SRS triggered by the PDCCH or a PUCCH that transmits HARQ-ACK for a PDSCH scheduled by the PDCCH. For example, in the case where the specific UL signal is an A-SRS, the PDCCH corresponding to the specific UL signal may also be a PDCCH that triggers the A-SRS. In addition, for example, in the case where the specific UL signal is a PUCCH that transmits HARQ-ACK, the PDCCH corresponding to the specific UL signal may also be a PDCCH that schedules the PDSCH and indicates the timing of the HARQ-ACK of the PDSCH. In the case where a specific UL signal does not correspond to a PDCCH, the default spatial relationship may also be the above-mentioned default spatial relationship 1.

[0227] The specific DL signal may also be PDCCH or PDSCH.

[0228] Default Spatial Relationship 4

[0229] The default spatial relationship may also be the QCL assumption of CORESET#0 (the CORESET with an ID of 0).

[0230] The specific DL signal may also be CORESET#0.

[0231] Default Spatial Relationships 5

[0232] The default spatial relation may also be the path loss reference RS.

[0233] The default spatial relationship may also be the RS (RS resource) used in the path loss estimation. The RS used in the path loss estimation may also be the RS resource obtained from the SS / PBCH block used by the UE to obtain the MIB. For example, assuming that the path loss reference RS information (pathlossReferenceRSs) for a specific UL signal is not given, or the UE is not given dedicated high-layer parameters, the RS used in the path loss estimation may also be the RS resource obtained from the SS / PBCH block used by the UE to obtain the MIB. The RS used in the path loss estimation may also be the path loss reference RS with index 0 in the path loss reference RS information (list of path loss reference RSs). For example, assuming that the UE is given path loss reference RS information (path loss reference RS (pathlossReferenceRSs) within PUCCH power control information (PUCCH-PowerControl)) and is not given PUCCH spatial relationship information (PUCCH-SpatialRelationInfo), the RS used in path loss estimation may also be a reference signal (referencesignal) within the PUCCH path loss reference RS having a PUCCH path loss reference RS-ID (PUCCH-PathlossReferenceRS-Id) with index 0 within the PUCCH path loss reference RS information (PUCCH-PathlossReferenceRS).

[0234] When the path loss reference RS for a specific UL signal is not set through higher layer signaling, the UE may use the RS used for path loss estimation in the default spatial relationship of the specific UL signal.

[0235] In the case where a path loss reference RS for a specific UL signal is set through higher layer signaling, the UE may also use the set path loss reference RS in a default spatial relationship of the specific UL signal.

[0236] The specific DL signal may also be a path loss reference RS.

[0237] <SRS resource set for antenna switching>

[0238] When the specific UL signal is an SRS based on an SRS resource set for antenna switching, the UE may also determine a default spatial relationship based on a specific time slot. The UE may also determine a default spatial relationship of an SRS using SRS resources of a specific time slot in an SRS resource set for antenna switching.

[0239] For example, when using the above-mentioned default spatial relationship 1, the UE may also determine the default TCI state or default QCL assumption of the PDSCH in a specific time slot as the default spatial relationship of the SRS in the specific time slot.

[0240] The UE may also use the default spatial relationship of the SRS using the SRS resources of the specific time slot in the default spatial relationship of the SRS using the SRS resources of the time slot other than the specific time slot within the same SRS resource set.

[0241] The UE may repeatedly transmit the SRS using the SRS resources in the SRS resource set for antenna switching in multiple time slots. The UE may transmit multiple SRS using multiple SRS resources in the SRS resource set for antenna switching in multiple time slots.

[0242] The specific time slot may be any one of the following specific time slots 1 and 2.

[0243] 《Special Time Slot 1》

[0244] The specific time slot may be a time slot of an SRS resource to be transmitted first or last in an SRS resource set for antenna switching.

[0245] use Figure 3 , illustrating an example of a case where a specific time slot is the time slot of the first SRS resource transmitted in the SRS resource set for antenna switching. The UE transmits SRS1 and SRS2 in one SRS resource set in multiple time slots. When the default spatial relationship of SRS1 transmitted in the time slot of the first SRS resource in the SRS resource set is TCI1 of CORESET1, the default spatial relationship of SRS2 transmitted in the subsequent time slot may be the same as the default spatial relationship of SRS1.

[0246] Specific Time Slot 2

[0247] The specific time slot may also be a time slot of an SRS resource having the lowest ID or the highest ID in an SRS resource set for antenna switching.

[0248] use Figure 3 , illustrating an example of a case where a specific time slot is a time slot of an SRS resource with the lowest ID in an SRS resource set for antenna switching purposes. The UE transmits SRS1 (SRS resource ID = 1) and SRS2 (SRS resource ID = 2) in one SRS resource set in multiple time slots. In a case where the default spatial relationship of SRS1 transmitted in the time slot of the SRS resource with the lowest ID in the SRS resource set is TCI1 of CORESET1, the default spatial relationship of SRS2 using other SRS resources may also be the same as the default spatial relationship of SRS1.

[0249] Even when a plurality of SRSs of an SRS resource set based on antenna switching purpose are transmitted in a plurality of time slots, the UE can use the same spatial relationship with these plurality of SRSs.

[0250] <RS used in path loss estimation>

[0251] In specific circumstances, the UE may also use RS resources obtained from the SS / PBCH block used by the UE to obtain the MIB in the path loss estimation of a specific UL signal for a specific cell. The RS resources may also be referred to as the default path loss reference RS. The SS / PBCH block used by the UE to obtain the MIB may also be received in the first cell. The specific circumstances may be a situation where the UE is not given a path loss reference RS (pathlossReferenceRSs), or before the UE is given dedicated high-level parameters, or a situation where the UE is not given a path loss reference RS (pathlossReferenceRSs) for a specific UL signal of a specific cell, or before the UE is given dedicated high-level parameters.

[0252] The specific cell may also be at least one of the first cell and the second cell. The first cell may be a PCell or a SpCell. The second cell may be an SCell or a cell other than the first cell.

[0253] The first cell can also be replaced by a cell or BWP that receives the SS / PBCH block used by the UE to obtain the MIB, a cell or BWP that receives the SS / PBCH block, a cell or BWP to which the SS / PBCH block is sent, or a cell or BWP to which the SS / PBCH block is set.

[0254] The SS / PBCH block used to obtain the MIB is in the CC or BWP of the first cell, the SS / PBCH block is received in the CC or BWP of the first cell, the SS / PBCH block is sent in the CC or BWP of the first cell, and the SS / PBCH block is set for the CC or BWP of the first cell, which can also be replaced with each other.

[0255] In a specific case, the UE may determine the RS used for path loss estimation according to any one of the following RS determination methods 1 to 3.

[0256] 《RS determination method 1》

[0257] In certain situations, the UE may also use the default path loss reference RS in the path loss estimation of all cells. For example, in certain situations, the UE may also use the default path loss reference RS of the first cell in the path loss estimation of all cells (for specific UL signals of all cells).

[0258] 《RS Decision Method 2》

[0259] In certain circumstances, the UE may also use the default path loss reference RS in the path loss estimation of the first cell. For example, in certain circumstances, when the SS / PBCH block used to obtain the MIB is in the CC or BWP of the first cell, the UE may also use the default path loss reference RS in the path loss estimation of the first cell (for a specific UL signal of the first cell).

[0260] In a specific case, the UE may also use a DL RS of a spatial relationship in the second cell (CC of the second cell) in path loss estimation of the second cell (for a specific UL signal of the second cell).

[0261] 《RS Decision Method 3》

[0262] In certain circumstances, the UE may also use the default path loss reference RS in the path loss estimation of the first cell. For example, in certain circumstances, when the SS / PBCH block used to obtain the MIB is in the CC or BWP of the first cell, the UE may also use the default path loss reference RS in the path loss estimation of the first cell (for a specific UL signal of the first cell).

[0263] In certain circumstances, the UE may also use the path loss reference RS set or updated through the MAC CE in the path loss estimation of the second cell (for a specific UL signal of the second cell). In certain circumstances, when the path loss reference RS for the second cell is not set or updated through the MAC CE, the DL RS of the spatial relationship in the second cell (CC of the second cell) may also be used in the path loss estimation of the second cell.

[0264] Even when a path loss reference RS is not configured for a certain cell and an SSB for acquiring the MIB is not received in the cell, the UE can appropriately determine the RS to be used for path loss estimation.

[0265] (Wireless Communication System)

[0266] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0267] Figure 41 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0268] In addition, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Radio Access Technology) (RAT) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0269] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (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.

[0270] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) and NR-NR dual connectivity) where both MN and SN are NR base stations (gNB)).

[0271] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in 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 and number of each cell and the user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0272] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0273] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the 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 be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0274] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0275] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, 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.

[0276] 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 also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0277] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0278] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may 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. may be used.

[0279] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0280] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0281] In addition, in the wireless communication system 1, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used.

[0282] The PDSCH is used to transmit user data, high-layer control information, system information block (SIB), etc. The PUSCH is also used to transmit user data, high-layer control information, etc. In addition, the PBCH is also used to transmit the master information block (MIB).

[0283] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0284] In addition, the DCI for scheduling PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, PDSCH may also be replaced by DL data, and PUSCH may also be replaced by UL data.

[0285] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0286] A search space may also correspond to PDCCH candidates that are consistent with one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0287] The PUCCH may also be used to transmit at least one uplink control information (uplink control information (UCI)) including channel state information (CSI), delivery confirmation information (e.g., may also be called hybrid automatic repeat request (HARQ-ACK)), ACK / NACK, etc.), and scheduling request (SR). The random access preamble used to establish a connection with a cell may also be transmitted through the PRACH.

[0288] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0289] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, 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. may also be transmitted.

[0290] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0291] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0292] (Base Station)

[0293] Figure 5 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may be provided with more than one.

[0294] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0295] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0296] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0297] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0298] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured by a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0299] The transmitting / receiving antenna 130 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0300] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0301] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0302] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0303] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT)) processing (as needed), inverse fast Fourier transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0304] The transmitting and receiving unit 120 (RF unit 122 ) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0305] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0306] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0307] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0308] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0309] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0310] (User Terminal)

[0311] Figure 6 The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each include more than one.

[0312] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0313] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0314] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and 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 and reception unit 220.

[0315] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0316] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured by a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0317] The transmitting / receiving antenna 230 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0318] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0319] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0320] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0321] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0322] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0323] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0324] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0325] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0326] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0327] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0328] The control unit 210 may also use a quasi co-location (QCL) parameter based on a specific time slot in the spatial relationship of a sounding reference signal (SRS) resource in a sounding reference signal (SRS) resource set for antenna switching, when no spatial relationship information is set in the SRS resource. The transmitting and receiving unit 220 may also use the SRS resource and the spatial relationship to send the SRS.

[0329] The specific time slot may also be the time slot of the SRS resource that is first or last transmitted in the SRS resource set, or may be the time slot of the SRS resource with the lowest or highest ID in the SRS resource set.

[0330] The transmitting and receiving unit 220 may receive a master information block in a synchronization signal block. If a reference signal for path loss reference is not configured for a specific cell, a reference signal resource obtained from the synchronization signal block may be used to estimate the path loss of the specific cell.

[0331] The specific cell may also be at least one of the first cell to which the synchronization signal block is transmitted and other cells.

[0332] The control unit 210 may also use a reference signal of a spatial relationship of a second cell to which the synchronization signal block is not transmitted in estimating the path loss of the second cell.

[0333] (Hardware Structure)

[0334] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0335] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending 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.

[0336] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0337] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0338] For example, only one processor 1001 is shown, 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 in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0339] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0340] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0341] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that enables a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0342] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other 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 executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0343] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, 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, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0344] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (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), the transmitting and receiving antenna 130 (230), etc. can also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) can also be installed by the transmitting unit 120a (220a) and the receiving unit 120b (220b) separately physically or logically.

[0345] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0346] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or different buses may be used between the devices.

[0347] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and the hardware may also be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented by at least one of these hardware.

[0348] (Variation Example)

[0349] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0350] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless 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) that is not dependent on a parameter set (numerology).

[0351] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0352] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0353] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0354] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0355] For example, a subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and a time slot or a mini time slot may also be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in the existing LTE, 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 may also be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0356] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0357] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may also be shorter than the TTI.

[0358] In addition, when one time slot or one mini time slot is referred to as TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0359] A TTI having a time length of 1 ms may 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 a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0360] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0361] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0362] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0363] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0364] In addition, a resource block may also be composed of one or more resource elements (RE). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

[0365] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0366] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0367] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0368] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. 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-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0369] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0370] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. In addition, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0371] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0372] Furthermore, information, signals, etc. can be output from a high layer (upper layer) to a low layer (lower layer), and from a low layer to a high layer. Information, signals, etc. can also be input and output via a plurality of network nodes.

[0373] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0374] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0375] In addition, physical layer signaling may 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 may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0376] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0377] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0378] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0379] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0380] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0381] 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", and "panel" can be used interchangeably.

[0382] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0383] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0384] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0385] In some cases, the mobile station is also referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or some other appropriate terminology.

[0386] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0387] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" may also be replaced by expressions corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0388] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0389] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node according to the circumstances. Obviously, in a network including one or more network nodes having a base station, various actions performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0390] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0391] The various modes and implementation modes described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 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, and next-generation systems based on these. In addition, multiple systems can also be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0392] The term “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the term “based on” means both “based only on” and “based at least on”.

[0393] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to a first and a second element does not mean that only two elements can be used, or that the first element must take precedence over the second element in some form.

[0394] The term "determining" used in this disclosure may include a variety of actions in some cases. For example, "determining" may also include judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. as situations in which "determining" is performed.

[0395] In addition, “judgment (decision)” can also regard receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. as situations in which “judgment (decision)” is made.

[0396] In addition, “judgment (decision)” can also regard resolving, selecting, choosing, establishing, comparing, etc. as situations in which “judgment (decision)” is performed. In other words, “judgment (decision)” can also regard some actions as situations in which “judgment (decision)” is performed.

[0397] In addition, "judge (decide)" can also be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0398] The terms "connected", "coupled", or all their variations used in this disclosure mean all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination of these. For example, "connection" may also be replaced by "access".

[0399] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0400] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted as "different".

[0401] In the present disclosure, when the terms "include", "including", and their variations are used, these terms, like the term "comprising", have an inclusive meaning. Furthermore, the term "or" used in the present disclosure does not mean an exclusive OR.

[0402] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0403] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the present invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

[0404] This application is based on Japanese Patent Application No. 2019-189757 filed on October 16, 2019. The contents thereof are incorporated herein in their entirety.

Claims

1. A terminal, characterized in that: have: A receiving unit, configured to receive a setting of a sounding reference signal resource set (SRS resource set) for the purpose of antenna switching; as well as A control unit applies the same spatial relationship in the first SRS resource and the second SRS resource when the spatial relationship information for the first SRS resource in the SRS resource set is not set, the spatial relationship information for the second SRS resource in the SRS resource set is not set, and the time of the second SRS resource is different from the time of the first SRS resource.

2. The terminal according to claim 1, characterized in that in, The time slot of the second SRS resource is different from the time slot of the first SRS resource.

3. The terminal according to claim 1 or 2, characterized in that: in, In a case where one or more control resource sets are configured in a component carrier of the first SRS resource and the second SRS resource, the spatial relationship is based on a quasi co-location assumption of a control resource set with a lowest ID in the one or more control resource sets, In the case where no control resource set is configured in the component carrier, the spatial relationship is based on the lowest ID of the transmission configuration indicator (TCI) state applicable in the physical downlink shared channel in the component carrier.

4. A wireless communication method, which is a wireless communication method of a terminal, characterized in that: have: The step of setting a sounding reference signal resource set (SRS resource set) for the purpose of receiving antenna switching; as well as When the spatial relationship information for the first SRS resource in the SRS resource set is not set, and the spatial relationship information for the second SRS resource in the SRS resource set is not set, and the time of the second SRS resource is different from that of the first SRS resource, the step of applying the same spatial relationship in the first SRS resource and the second SRS resource.

5. A base station, characterized in that: have: A sending unit, which sends a setting of a sounding reference signal resource set, i.e., an SRS resource set, for the purpose of antenna switching; as well as A control unit controls the reception of the first SRS resource and the second SRS resource to which the same spatial relationship is applied, when the spatial relationship information for the first SRS resource in the SRS resource set is not set, the spatial relationship information for the second SRS resource in the SRS resource set is not set, and the time of the second SRS resource is different from that of the first SRS resource.

6. A system comprising a terminal and a base station, characterized in that: The terminal has: A receiving unit, configured to receive a setting of a sounding reference signal resource set (SRS resource set) for the purpose of antenna switching; as well as a control unit, wherein, when spatial relationship information for a first SRS resource in the SRS resource set is not set, spatial relationship information for a second SRS resource in the SRS resource set is not set, and time of the second SRS resource is different from time of the first SRS resource, the same spatial relationship is applied to the first SRS resource and the second SRS resource, The base station sends the setting.

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