Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives a setting of a sounding reference signal (SRS) resource set used for antenna switching; and a control unit that, on the basis of the setting, controls SRS transmission that uses fewer antennas than the total number of antennas and uses more than four transmission ports.

Description

Terminal, wireless communication method and base station

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

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

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

[0004] 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

[0005] In 3GPP Rel. 15 / 16, the maximum number of UL layers is 4, and the maximum number of Sounding Reference Signal (SRS) ports is also 4. Therefore, UL transmission is realized by a simple relationship between layers and uplink (UL) channel / signal (PUSCH / SRS) ports.

[0006] In future wireless communication systems (e.g., 3GPP Rel. 18 and later), support for more than four layers in UL transmission from a terminal (user terminal, User Equipment (UE)) is being considered. However, various settings for supporting more than four SRS ports have not been clarified. This may result in inappropriate transmission of SRS using more than four SRS ports.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately transmit SRS using more than four SRS ports.

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives a configuration of a sounding reference signal (SRS) resource set for antenna switching, and a control unit that controls transmission of the SRS using fewer antennas than the total number of antennas and more than four transmission ports based on the configuration.

[0009] According to one aspect of the present disclosure, SRS transmission using more than four SRS ports can be appropriately performed.

[0010] Fig. 1 shows an example of an SRS resource set configuration information element. Fig. 2 shows an example of an SRS resource configuration information element. Fig. 3 shows an example of association of parameters related to SRS. Fig. 4 shows an example of an SRS frequency hopping band. Fig. 5 shows an example of SRS frequency hopping. Fig. 6 shows another example of SRS frequency hopping. Fig. 7 shows the number of transmission combs K in Rel. 16. TC and the maximum number of cyclic shifts of SRS, n SRS CS,max 8 shows an example of a table showing the relationship between the number of ports N of the SRS. ap SRS When is 2, the number of combs sent is K TC and the SRS cyclic shift value n SRS CS,i 9 shows an example of a table showing the number of ports N of the SRS. ap SRSWhen is 4, the number of combs sent is K TC and the SRS cyclic shift value n SRS CS,i FIG. 10 shows an example of a table showing the SRS transmission power for each port in a plurality of cases. FIG. 11 shows an example of a power amplifier circuit in a UE. FIG. 12 shows an example of SRS transmission power for each port in a plurality of cases. FIG. 13 shows an example of embodiment A5. FIG. 14 shows an example of an 8-port SRS subjected to TDM. FIGS. 15A to 15C show examples of SRS repetition and intra-slot frequency hopping. FIGS. 16A and 16B show an example of option 1 of embodiment B4. FIG. 17 shows an example of port distribution using TDM. FIG. 18 is a description example of specifications related to an 8-port SRS for antenna switching. FIG. 19 is a description example of specifications related to an 8-port SRS for antenna switching. FIG. 20 shows an example of an SRS transmission port switching pattern. FIG. 21 shows an example of an index corresponding to a subset of settings. FIG. 22 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 23 is a diagram showing an example of a configuration of a base station according to an embodiment. Fig. 24 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. Fig. 25 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 26 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (SRS) In NR, the use of the sounding reference signal (SRS) is diverse. NR's SRS is not only used for CSI measurement of the uplink (UL) used in the existing LTE (LTE Rel. 8-14), but also for CSI measurement of the downlink (DL), beam management, etc. It is also used.

[0012] A UE may be configured with one or more SRS resources, which may be identified by an SRS Resource Index (SRI).

[0013] Each SRS resource may have (correspond to) one or more SRS ports, for example, the number of ports per SRS may be 1, 2, 4, etc.

[0014] A UE may be configured with one or more SRS resource sets. One SRS resource set may be associated with a predetermined number of SRS resources. The UE may share higher layer parameters for the SRS resources included in one SRS resource set. Note that the term "resource set" in the present disclosure may be interpreted as a set, a resource group, a group, or the like.

[0015] Information regarding the SRS resource or resource set may be configured in the UE using higher layer signaling, physical layer signaling, or a combination thereof.

[0016] The SRS configuration information element (for example, the RRC information element "SRS-Config") may include an SRS resource set configuration information element (FIG. 1), an SRS resource configuration information element (FIG. 2), and the like.

[0017] The SRS resource set configuration information element (e.g., the RRC parameter "SRS-ResourceSet") may include an SRS resource set ID (Identifier) ​​(SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type (resourceType), and information on SRS usage.

[0018] Here, the SRS resource type may indicate the time domain behavior of the SRS resource configuration, and may indicate any of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (A-SRS, AP-SRS). Note that the UE may transmit the P-SRS and SP-SRS periodically (or periodically after activation). The UE may transmit the A-SRS based on an SRS request in the DCI.

[0019] Furthermore, the use of the SRS ("usage" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1) parameter) may be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. For example, the SRS for codebook or non-codebook use may be used to determine a precoder for codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on the SRI.

[0020] The beam management SRS may be assumed to be transmitted at a given time instant only once for each SRS resource set, and multiple SRS resources in the same Bandwidth Part (BWP) that have the same time domain behavior may be transmitted simultaneously if they belong to different SRS resource sets.

[0021] The SRS resource configuration information element (e.g., the RRC parameter "SRS-Resource") may include an SRS resource ID (SRS-ResourceId), the number of SRS ports, the SRS port number, the number of transmission combs, SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, an SRS resource type, a sequence ID, spatial relationship information, etc.

[0022] The value of the transmission comb number (transmissionComb) is {2,4}. The number of SRS ports (nrofSRS-Ports) N ap SRS The value of is {1,2,4}. Antenna port number p i The value of is {1000, 1001, ...}. The number of consecutive OFDM symbols for SRS (nrofSymbols) N symb SRS The value of is {1,2,4}. The offset in symbols, l, counting backward in the time domain from the end of the slot to the start position in the time domain (startPosition). offset is {0,1,...5} and the starting position is l0=N symb slot -1-l offset is given by

[0023] The setting of the number of combs to be transmitted may include a comb offset and a cyclic shift (CS index, CS number).

[0024] comb offset (subcarrier offset) = {0,1,...K TC −1} and CS may be multiplexed using the same number of transmission combs, the same RB, and the same symbol.

[0025] The UE may switch the Bandwidth Part (BWP) for transmitting the SRS for each slot, or may switch the antenna, and may apply at least one of intra-slot hopping and inter-slot hopping to the SRS transmission.

[0026] In the existing SRS, p i Frequency domain starting position k0 for (p_i) p_i is given by the following formula: k0 p_i =k - 0 p_i +Σ b=0 BSRS K TC M SC,b SRS n b

[0027] where k - denotes the variable k with an overline, and may also be called k-bar. - 0 p_i is comb offset K - TC It may be based on K TC is the number of combs sent. M SC,b SRS is the SRS bandwidth m SRS,b n is the number of subcarriers used for SRS transmission within [RB]. b is a constant.

[0028] (SRS Bandwidth Setting) The Rel. 16 specifications stipulate the SRS bandwidth. SRS ∈{0,...,63} (setting index, row index) and B SRS ∈{0, 1, 2, 3} (band division boundary number) is set using higher layer signaling, and the SRS bandwidth is determined using a table (association / mapping of parameters related to SRS) defined in the specification.

[0029] B SRS The available bandwidth is divided into several parts using C. The parts are used for SRS hopping. SRS sets the set of SRS bands. B SRSselects one bandwidth from a configured set. This example is SRS = 13. SRS bandwidth m SRS,b All candidate values ​​of (number of RBs) are multiples of 4. SRS divides the available bandwidth into parts. B SRS The larger the number of frequency partitions (the smaller the size of the frequency partitions).

[0030] For SRS frequency hopping, the parameter b hop ∈{0, 1, 2, 3} is set. b hop <B SRS SRS frequency hopping is enabled if ≠ ...

[0031] Within the band (hopping band) given to SRS frequency hopping, SRS band m SRS,b For example, an SRS having C SRS =24, b hop =0, B SRS =2, N symb SRS If m = 4, SRS,b is 24RBs.

[0032] (UE Sounding Procedure for DL ​​CSI Acquisition) In Rel. 15 NR, as described above, antenna switching (which may also be referred to as antenna port switching) can be configured for use with SRS. SRS antenna switching may be used, for example, when downlink CSI acquisition is performed using uplink SRS in a Time Division Duplex (TDD) band.

[0033] For example, for UEs capable of having fewer antenna ports available for transmission than for reception, UL SRS measurements may be used to determine the DL precoder.

[0034] In addition, the UE may report UE capability information (e.g., supportedSRS-TxPortSwitch in the RRC parameter srs-TxSwitch) indicating the SRS transmit (Tx) port switching pattern it supports to the network. This pattern may be expressed in the form of "txry," such as "t1r2," "t2r4," etc., which may mean that SRS can be transmitted using x antenna ports out of a total of y antennas (which may be expressed as xTyR), where y may correspond to all or a subset of the UE's receive antennas.

[0035] When x and y in "txty" have the same value, they may be written as xT=xR (for example, 4T=4R).

[0036] For example, a 2T4R (two transmit ports, four receive ports) UE may be configured with an SRS resource set for DL ​​CSI acquisition that includes two SRS resources with two ports each and whose purpose is antenna switching.

[0037] The UE capability information for SRS transmission switch (srs-TxSwitch) indicates whether the UE supports SRS for DL ​​CSI acquisition (DL CSI acquisition, transmit antenna switching, SRS antenna switching). The UE capability information includes a parameter supportedSRS-TxPortSwitch. The supportedSRS-TxPortSwitch indicates the SRS Tx port switching pattern supported by the UE. The SRS transmission port switching pattern is a mandatory function that involves capability signaling.

[0038] In the present disclosure, the terms SRS Tx port switching pattern and SRS antenna switching setting may be read interchangeably.

[0039] The value of supportedSRS-TxPortSwitch may indicate 't1r2' for 1T2R, 't2r4' for 2T4R, 't1r4' for 1T4R, 't1r4-t2r4' for 1T4R / 2T4R, 't1r1' for 1T=1R, 't2r2' for 2T=2R, 't4r4' for 4T=4R, or 'notSupported' for not supported.

[0040] The UE antenna switching capability, denoted by supportedSRS-TxPortSwitch as xTyR ('txry'), corresponds to a UE capable of SRS transmission on x antenna ports across a total of y antennas, where y corresponds to all or a subset of the UE receive antennas. For example, 2T4R is two pairs of antennas.

[0041] supportedSRS-TxPortSwitch MAY report at least one of the following values: 't1r2', 't1r4', 't2r4', 't2r2', 't4r4', 't1r4-t2r4'

[0042] srs-TxSwitch may include txSwitchImpactToRx and txSwitchWithAnotherBand. txSwitchImpactToRx indicates the lowest band entry number of the UL group (see txSwitchWithAnotherBand below) that affects the DL of this band entry. txSwitchWithAnotherBand indicates the lowest band entry number of the UL group. The UL group is defined as band entries with ULs that affect each other's ULs. That is, SRS Tx port switching on any cell in the group affects the ULs on all cells in the group. If the UL group contains only one band entry, this parameter is not present. For txSwitchImpactToRx and txSwitchWithAnotherBand, a value of 1 means the first entry, and a value of 2 means the second entry. Even if supportedSRS-TxPortSwitch is set to 'notSupported' for a band entry, the UE may include txSwitchImpactToRx and txSwitchWithAnotherBand in that band entry. All DL and UL bands that switch together shall indicate the same entry number. The entry number is the band entry number within the band combination. The UE is restricted from including fallback band combinations for the purpose of indicating different SRS switching capabilities. The band containing the UL band shall include a band that corresponds to support for SRS-SwitchingTimeNR and is associated with FeatureSetUplinkId set to 0.

[0043] When a UE is configured with an SRS resource set (SRS-ResourceSet) and the usage within that SRS resource set (higher layer parameter usage) is set to antenna switching ('antennaSwitching'), the UE does not assume that different spatial relationships are configured for multiple SRS resources within the same SRS resource set.

[0044] If a UE is configured with an SRS resource set (SRS-ResourceSet) and the usage (higher layer parameter usage) within that SRS resource set is set to antenna switching ('antennaSwitching'), the UE may be configured with one of the following configurations 1 to 5 depending on the indicated (reported) UE capability information (UE antenna switching capability information, which may be UE capability information indicating the SRS transmit port switching pattern (SRS antenna switching configuration) supported by the UE, supportedSRS-TxPortSwitch).

[0045] [Configuration 1] For 1T2R, up to two SRS resource sets with different values ​​for the resource type (higher layer parameter resourceType) within the SRS resource set, each set having two SRS resources transmitted in different symbols, each SRS resource in a given set consisting of a single SRS port, and the SRS port of the second resource in the set being associated with a different UE antenna port than the SRS port of the first resource in the same set.

[0046] [Configuration 2] For 2T4R, up to two SRS resource sets with different values ​​for the resource type (higher layer parameter resourceType) within the SRS resource set, where each SRS resource set has two SRS resources transmitted in different symbols, each SRS resource in a given set consists of two SRS ports, and the SRS port pair of the second resource in the set is associated with a different UE antenna port pair than the SRS port pair of the first resource in the same set.

[0047] Configuration 3: For 1T4R, zero or one SRS resource set with four SRS resources transmitted in different symbols, with the resource type within the SRS resource set (higher layer parameter resourceType) set to periodic or semi-persistent. Each SRS resource in a given set consists of a single SRS port, and each SRS port of a resource is associated with a different UE antenna port.

[0048] [Configuration 4] For 1T4R, zero or two SRS resource sets each configured with a resource type (higher layer parameter resourceType) within the SRS resource set set to aperiodic, with a total of four SRS resources transmitted in different symbols of two different slots. The SRS ports of each SRS resource within the two given sets are associated with different UE antenna ports. Each of the two sets is configured with two SRS resources, or one set is configured with one SRS resource and the other set is configured with three SRS resources. The UE expects both sets to be configured with the same values ​​of the power control parameters within the SRS resource set (higher layer parameters alpha, p0, pathlossReferenceRS, and srs-PowerControlAdjustmentStates). The UE assumes that the values ​​of the parameters (the upper layer parameter aperiodicSRS-ResourceTrigger, a parameter indicating the codepoint of the SRS request field in the DCI) in each SRS resource set are the same, and that the values ​​of the upper layer parameter slotOffset in each SRS resource set are different.

[0049] [Configuration 5] Up to two SRS resource sets, each with one SRS resource, for 1T=1R, 2T=2R, or 4T=4R. The number of SRS ports for each resource is 1, 2, or 4.

[0050] If the UE is configured for antenna switching usage within the SRS resource set, the UE may configure the SRS antenna switching configuration depending on the reported UE capability information (supportedSRS-TxPortSwitch, supportedSRS-TxPortSwitch-v1610).

[0051] If a set of SRS resources is transmitted in the same slot as Y symbols, the UE is configured with a guard period of Y symbols during which the UE does not transmit any other symbols. The guard period is between the SRS resources of the set.

[0052] If the indicated UE capability is 1T4R / 2T4R, the UE is assumed to be configured with the same SRS port number of 1 or 2 for all SRS resources in the SRS resource set.

[0053] If the indicated UE capability is 1T2R, 2T4R, 1T4R, or 1T4R / 2T4R, the UE shall not configure or trigger more than one SRS resource set with usage (higher layer parameter usage) set to antenna switching in the same slot. If the indicated UE capability is 1T1R, 2T2R, or 4T4R, the UE shall not configure or trigger more than one SRS resource set with usage (higher layer parameter usage) set to antenna switching in the same symbol.

[0054] The UE capability information for the SRS transmission switch (srs-TxSwitch-v1610) may include a parameter supportedSRS-TxPortSwitch-v1610. Reporting of this parameter is optional. supportedSRS-TxPortSwitch-v1610 indicates a downgrading configuration of the SRS transmission port switching pattern, and reporting of this parameter is optional. When the UE indicates support for a downgrading configuration of the SRS transmission port switching pattern using supportedSRS-TxPortSwitch-v1610, the UE may report at least one of the following values ​​to indicate support for the downgrading configuration based on the content reported in supportedSRS-TxPortSwitch:・'t1r1-t1r2' ・'t1r1-t1r2-t1r4' ・'t1r1-t1r2-t2r2-t2r4' ・'t1r1-t2r2' ・'t1r1-t2r2-t4r4' ・'t1r1-t1r2-t2r2-t1r4-t2r4'

[0055] In the present disclosure, the downgrade configuration and the SRS Tx port switching pattern using antennas / ports that are less than the total number of antennas / total number of antennas / total number of Rx antennas / maximum number of Rx ports may be read interchangeably.

[0056] The Rel. 17 UE capability signaling (srs-AntennaSwitchingBeyond4RX-r17) indicates whether the UE supports SRS antenna switching for more than four Rx. The capability signaling has several parameters: - supportedSRS-TxPortSwitchBeyond4Rx-r17. It indicates the supported xTyR combinations. It is an 11-bit bitmap. The bitmap starts from the first / leftmost bit (bit 0). Each bit corresponds to {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8}. In any displayed value, x is less than or equal to the x value associated with the largest y. - entryNumberAffectBeyond4Rx-r17. - entryNumberSwitchBeyond4Rx-r17: It indicates the entry number of the first listed band with this UL in the band combination that affects this DL. - entryNumberSwitchBeyond4Rx-r17: It indicates the entry number of the first listed band with this UL in the band combination that switches with UL.

[0057] A UE indicating support for this capability indicates support for srs-TxSwitch.

[0058] If the same xYyR value reported in supportedSRS-TxPortSwitchBeyond4Rx-r17 as the xYyR value reported using supportedSRS-TxPortSwitch / supportedSRS-TxPortSwitch-v1610 is reported, the reported values ​​of entryNumberAffectBeyond4Rx-r17 and entryNumberSwitchBeyond4Rx-r17 are invalid.

[0059] In the present disclosure, the terms SRS transmission port switching pattern and antenna switching SRS setting may be read interchangeably.

[0060] (Multi-port SRS Transmission) Multi-port SRS transmission will now be described. When transmitting SRS via multiple ports, the UE performs multiplexing using cyclic shifts of the base sequence. The following equation is used to express the SRS multiplexing for the antenna port P i Cyclic shift α in i Shows.

[0061] This formula is being considered for use in Rel. 17. In this formula, the number of ports, N ap SRS = 4 and maximum number of cyclic shifts n SRS CS,max The case where K = 6 is called Case 1, and the case where K = 6 is called Case 2. TC becomes 8.

[0062] Figure 3 shows the number of transmitted combs K in Rel. 16. TC and the maximum number of cyclic shifts of SRS, n SRS CS,max This is a table showing the relationship between n SRS CS,max ∈{0,1,…,n SRS CS,max}, N ap SRS ∈{1, 2, 4}. Figure 4 shows the number of ports of the SRS, N ap SRS When is 2, the number of combs sent is K TC and the SRS cyclic shift value n SRS CS,i 5 is a table showing the number of ports N of the SRS. ap SRS When is 4, the number of combs sent is K TC and the SRS cyclic shift value n SRS CS,i 1 is a table showing the above.

[0063] The following equation is the resource start position k0 in the frequency direction. p_i Shows.

[0064] This formula is being considered for use in Rel. 17. Note that k -TC p_i The first case, A, corresponds to the odd-numbered ports {1001, 1003} when the number of combs sent is 8. The second case, B, corresponds to the above-average cyclic shift value (n ap CS =∈{n SRS CS,max / 2,…,n SRS CS,max})) The third case C is the other case.

[0065] nshift is set by the parameter freqDomainShift of the SRS resource configuration information element (Fig. 2). - TC For K, the combOffset of the SRS resource configuration information element is used. TC is set by the transmissionComb of the SRS resource configuration information element. That is, in case C, the value of the RRC parameter is applied as is.

[0066] FIG. 6 shows the number of ports of the SRS, N ap SRS When is 2, the resource start position k in the frequency direction TC p_i In this example, case C is used. Figure 7 shows the number of ports N ap SRS When k is 4, the resource start position k0 in the frequency direction p_i In this example, the first and third lines ((n SRS CS )={0,1,2,3}or{0,1,2,3,4,5}), case C is applied, and the second and fourth lines ((n SRS CS )={4,5,6,7}or{6,7,8,9,10,11}), Case B is applied, and in the 5th line (K TC (n SRS CS,max ) = 8(6)), Case A applies.

[0067] FIG. 8 shows the SRS allocation for each port when the number of transmission combs is 4. In this example, case C is used for ports #0 and #2, and case B is used for ports #1 and #3. Different cyclic shifts are used for each port. In FIG. 8, the horizontal axis represents time (symbols) and the vertical axis represents frequency (subcarriers). The same applies to other diagrams showing SRS allocation.

[0068] 9 shows the SRS allocation for each port when the number of transmission combs is 2. In this example, ports #0 and #1 use case C. Also, different cyclic shifts are used for each port.

[0069] (Base Sequence) The base sequence of the SRS is given by the following equation:

[0070] At least one of sequence hopping and group hopping for the low PAPR sequence may be configured by RRC. - u,v (n) is divided into multiple groups. - denotes a variable with an overline over r, which may also be called r-bar. u={0,1,...,29} denotes the group number, and v denotes the base sequence number within the group. Each group has length mm ZC =N sc RB / 2 δ , 1 / 2≦m / 2 δ One base sequence (v=0) ≦5 and length mM ZC =N sc RB / 2 δ , 6≦m / 2 δ The base sequence r - u,v (0),...,r - u,v (M ZC -1) is defined as the sequence length M ZC Depends on.

[0071] In group hopping, the group number u is IDSRS and the symbol number in the radio frame for the SRS resource, given by:

[0072] The symbol number is the slot number n in the radio frame. s,f μ and the number of symbols in the slot, N symb slot and the starting symbol l0 for that SRS resource and the SRS symbol number l'∈{0,1,...,N symb SRS -1} and n by the upper layer parameter sequenceId in the SRS-Resource IE. ID SRS ∈{0,1,...,1023}, or n by the upper layer parameter sequenceId in the SRS-PosResource-r16 IE. ID SRS ∈{0,1,...,65535} is given.

[0073] If groupOrSequenceHopping is equal to 'neither', then neither group hopping nor sequence hopping is used. In this case, the group number u and sequence number v are given by:

[0074] If groupOrSequenceHopping is equal to 'groupHopping', group hopping is used and sequence hopping is not used. In this case, the group number u and sequence number v are given by: Here, at the beginning of each radio frame, the pseudo-random sequence c(i) is init =n ID SRS It is initialized by

[0075] If groupOrSequenceHopping is equal to 'sequenceHopping', sequence hopping is used and group hopping is not used. In this case, the group number u and sequence number v are given by: Here, at the beginning of each radio frame, the pseudo-random sequence c(i) is init =n ID SRS It is initialized by

[0076] (SRS Transmission Power Control) Using the index l of the power control adjustment state (closed-loop state), the SRS transmission power (P ＳＲＳ、ｂ，ｆ，ｃ (i, q ｓ , l)) is P ＣＭＡＸ，ｆ，ｃ (i), P Ｏ＿ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ), M ＳＲＳ，ｂ，ｆ，ｃ (i), α ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ), P.L. ｂ，ｆ，ｃ (q ｄ ), h ｂ，ｆ，ｃ Based on (i, l), it is given by:

[0077] Furthermore, the SRS transmission opportunity i is a period during which the SRS is transmitted, and may be composed of, for example, one or more symbols, one or more slots, or the like.

[0078] Here, P ＣＭＡＸ，ｆ，ｃ (i) is, for example, the UE maximum output power for carrier f of serving cell c at SRS transmission opportunity i. P Ｏ＿ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ) is the active UL BWP b of carrier f of serving cell c and the SRS resource set q ｓ (provided by SRS-ResourceSet and SRS-ResourceSetId), and a parameter related to the target received power provided by p0 for (for example, a parameter related to the transmit power offset, also referred to as the transmit power offset P0 or the target received power parameter, etc.).

[0079] M ＳＲＳ，ｂ，ｆ，ｃ(i) is the SRS bandwidth in number of resource blocks for SRS transmission opportunity i on active UL BWP b of carrier f of serving cell c and subcarrier spacing μ;

[0080] α ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ) is the active UL BWP b of a serving cell c and carrier f with subcarrier spacing μ and an SRS resource set q ｓ and α (e.g., alpha) for

[0081] PL ｂ，ｆ，ｃ (q ｄ ) is the active DL BWP of serving cell c and the SRS resource set q ｓ and, for RS resource index q ｄ is the DL path loss estimate [dB] (path loss estimate [dB], path loss compensation) calculated by the UE using the RS resource index q ｄ is the SRS resource set q ｓ and a pathloss reference RS (pathloss reference RS, pathloss (PL)-RS, DL-RS for pathloss measurement, e.g., provided by pathlossReferenceRS) associated with the SS / PBCH block index (e.g., ssb-Index) or a CSI-RS resource index (e.g., csi-RS-Index).

[0082] If the UE is not provided with pathloss reference RSs (pathlossReferenceRSs) or before the UE is provided with individual upper layer parameters, the UE may use RS resources obtained from the SS / PBCH block used by the UE to acquire the MIB. ｂ，ｆ，ｃ (q ｄ ) is calculated.

[0083] h ｂ，ｆ，ｃ(i, l) is the SRS power control adjustment state for the active UL BWP of carrier f of serving cell c at SRS transmission opportunity i. If the SRS power control adjustment state configuration (e.g., srs-PowerControlAdjustmentStates) indicates the same power control adjustment state for SRS transmission and PUSCH transmission, 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, the SRS power control adjustment state h ｂ，ｆ，ｃ (i) is δ ＳＲＳ，ｂ，ｆ，ｃ It may be based on (m).

[0084] If TPC accumulation is valid, h ｂ，ｆ，ｃ (i) is δ ＳＲＳ，ｂ，ｆ，ｃ It may be based on the cumulative value of (m).

[0085] If TPC accumulation is invalid, h ｂ，ｆ，ｃ (i) is δ ＳＲＳ，ｂ，ｆ，ｃ (i) (absolute value) may also be used.

[0086] where δ ＳＲＳ，ｂ，ｆ，ｃ (m) may be a TPC command value that is jointly coded with other TPC commands in a PDCCH having DCI (e.g., DCI format 2_3). m=0 C(Si)-1 δ SRS,b,f,c (m) is the SRS transmission opportunity i-i on the active UL BWP b of carrier f with serving cell c and subcarrier spacing μ. ０ K ＳＲＳ (i-i ０ )-1 symbol before and K ＳＲＳ (i) The cardinality C(S ｉ ) a set S of TPC command values ｉ may be the sum of the TPC commands in ０ is the SRS transmission opportunity i-i ０ K ＳＲＳ (i-i ０ )-1 symbols before is K ＳＲＳ(i) It may be the smallest positive integer that is earlier than the symbol before.

[0087] If the SRS transmission is aperiodic, K SRS (i) may be the number of symbols in the active UL BWP b of carrier f of serving cell c after the last symbol of the corresponding PDCCH that triggers the SRS transmission and before the first symbol of the SRS transmission. If the SRS transmission is semi-persistent or periodic, K SRS (i) is the number of symbols per slot N in the active UL BWP b of carrier f of serving cell c symb slot and the minimum value of the value provided by k2 in the PUSCH common configuration information (PUSCH-ConfigCommon). SRS,min It may also be the number of symbols.

[0088] In Rel. 15 / 16, P0 and α for one closed loop (CL) state index are configured by RRC.

[0089] In Rel.17, if TCI-State is provided in dl-OrJointTCI-StateList or TCI-UL-State, P0 and α for one closed-loop (CL) state index are as follows: - if followUnifiedTCIstateSRS (setting SRS to follow unified TCI state) is provided, they are given by p0AlphaSetforSRS associated with the indicated TCI-State or the indicated TCI-UL-State. - otherwise, if followUnifiedTCIstateSRS is not provided, they are given by p0AlphaSetforSRS associated with the TCI-State or TCI-UL-State of the SRS resource with the lowest SRS-ResourceId in the SRS resource set.

[0090] In Rel. 15 / 16, the PL-RS uses the SRS resource set q s If pathlossReferenceRS is not provided, the UE uses the RS resource obtained from the SS / PBCH block with the same SS / PBCH block index as the SS / PBCH block index of the SS / PBCH block used to obtain the MIB for pathloss calculation (RS resource index q for pathloss PL). d If neither pathlossReferenceRS nor spatialRelationInfo is provided and enableDefaultBeamPL-ForSRS is configured, the UE uses the default RS for pathloss calculation (RS resource index q for pathloss PL). d The index of the default RS provides periodic RS resources with qcl-Type set to 'typeD' in the following TCI states or QCL assumptions: - If a CORESET is provided in the active DL BWP of the serving cell c, the TCI state or QCL assumption of the CORESET with the lowest index in the active DL BWP. - If a CORESET is not provided in the active DL BWP of the serving cell c, the active PDSCH TCI state with the lowest ID in the active DL BWP.

[0091] In Rel. 17, if a TCI-State is provided in dl-OrJointTCI-StateList (DL or Joint TCI state list) or TCI-UL-State (UL TCI state), the PL-RS shall follow: - if followUnifiedTCIstateSRS is provided, the indicated TCI-State or indicated TCI-UL-State from the set of configured TCI-State or indicated TCI-UL-State, which is the applied TCI state; - otherwise, the same RS as the PL-RS in Rel. 15 / 16.

[0092] (Maximum transmission power (P ＣＭＡＸ )) Maximum transmission power P ＣＭＡＸ are defined for FR1, FR2, or interoperability cases (e.g., EN-DC), respectively. ＣＭＡＸ is applied to the cases of single carrier, CA, and DC. For example, in the case of a single carrier of FR1, P ＣＭＡＸ is defined as follows:

[0093] The UE calculates P ＣＭＡＸ and transmits (reports) it to the base station (gNB) using the PHR MAC CE. ＣＭＡＸ You can find out.

[0094] Each parameter will be explained below. ＥＭＡＸ : Given by additionalPmax in the RRC information element NR-NS-PmaxList or by the p-Max information element (set by the base station). P ＰｏｗｅｒＣｌａｓｓ ΔP: the maximum power of the UE specified in the specification, a parameter that does not take into account the tolerance specified in the specification. This parameter is determined by the UE and known to the base station. ＰｏｗｅｒＣｌａｓｓ ΔT: A parameter that indicates the power adjustment of a high-power UE based on certain conditions. This parameter is determined by the UE and is known to the base station if the UE supports PC3.ＩＢ，ｃ : NR Carrier Aggregation (CA), Supplemental UpLink (SUL), E-UTRA-NR Dual Connectivity (EN-DC) additional allowance value for serving cell c. This parameter is defined in the specifications. MPR: Maximum Power Reduction, used to limit UL transmission power. A-MPR: Additional Maximum Power Reduction, used to limit UL transmission power. The total of maximum power reduction is max(MPR, A-MPR). ΔMPR: Indicates the amount of change in MPR. ΔT ＲｘＳＲＳ : A parameter applied when transmitting SRS when the usage of SRS-ResourceSet is 'antennaSwitching'. P-MPR: Power Management Maximum Power Reduction. This parameter is used to ensure compliance with applicable electromagnetic energy absorption requirements and to address unwanted radiation / self-sensing requirements when simultaneous transmissions are performed on multiple Radio Access Technologies (RATs) in scenarios outside the scope of 3GPP RAN specifications. This parameter is also used to ensure compliance with applicable electromagnetic energy absorption requirements when proximity detection is used to address requirements requiring lower maximum output power.

[0095] (Port Allocation with TDM) For antenna switching / codebook usage, it is considered to support 8-port (8-layer) UL channel measurement by SRS and mapping different SRS ports to different OFDM symbols (i.e., TDM) (Fig. 10). It is also conceivable to map all 8 ports to one OFDM symbol.

[0096] When port allocation using TDM (TDM mapping) is applied, the number of cyclic shifts occupied by one OFDM symbol is small, which has the advantage of high robustness against delay. Also, the power per port can be increased. However, there may be a restriction that multiple OFDM symbols use the same frequency resource / transmission power.

[0097] For example, as the SRS resource configuration, it is conceivable to allocate four ports per OFDM symbol and configure eight-port SRS transmission using two or more OFDM symbols (for example, FIG. 10).

[0098] The specification defines a transmission power associated with an SRS transmission opportunity i corresponding to an SRS transmission configured by an SRS resource (Equation (1) above), which means SRS transmission in one or more OFDM symbols. This transmission power is distributed equally among the antenna ports configured for SRS (e.g., configured by the SRS resource configuration).

[0099] (Issue) In future wireless communication systems (e.g., 3GPP Rel. 18 and later), support for more than four layers (e.g., eight layers) in UL transmission from a terminal (user terminal, User Equipment (UE)) is being considered. However, various settings for supporting more than four SRS ports have not been clarified. For example, SRS transmission power control has not been clarified. As a result, there is a risk that SRS transmission using more than four SRS ports may not be properly performed.

[0100] Therefore, the present inventors have conceived a method that can appropriately transmit SRS using more than four SRS ports.

[0101] (Various Replacements, etc.) Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0102] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0103] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0104] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0105] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0106] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0107] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0108] In this disclosure, "having the capability of..." may be read interchangeably as "supporting / reporting the capability of...".

[0109] In the present disclosure, ceil(x), ceiling function, and ceiling function may be interchangeable. In the present disclosure, floor(x), floor function, and floor function may be interchangeable. In the present disclosure, sqrt(x) and square root may be interchangeable. In the present disclosure, x mod y, mod(x,y), mod function, and modulo operation may be interchangeable. In the present disclosure, Σ i=M N f(i), the summation of f(i) over i = M, M+1,...,N, and f(M) + f(M+1) +... + f(N) may be interpreted interchangeably. C(x,y) represents the number of combinations of x to y (combinatorial coefficient), and is also called the binomial coefficient.

[0110] In this disclosure, a b, a_b, and a with b added to the bottom right of a may be read interchangeably. c , a^c, and the notation of a with c added to the upper right of a may be read interchangeably. b c , a_b^c, and the notation in which b is added to the bottom right of a and c is added to the top right may be read interchangeably. ~ may be expressed by adding 〜 to the x, or may be referred to as x tilde. - may be represented by an x ​​with a - above it, or may be called an x-bar.

[0111] In the present disclosure, the terms drop, abort, cancel, puncture, rate match, postpone, do not transmit, etc. may be read interchangeably.

[0112] As the SRS in the present disclosure, at least one of P-SRS, SP-SRS, and AP-SRS may be used. In the present disclosure, P-SRS and P-SRS may be interchangeable. In the present disclosure, SP-SRS and SP-SRS may be interchangeable. In the present disclosure, AP-SRS and AP-SRS may be interchangeable. Resource set group and SRS resource set group may be interchangeable.

[0113] In the present disclosure, using x Tx ports and y Rx ports / antennas, applying xTyR, transmitting (reporting) 'txry' in UE capability information (e.g., supportedSRS-TxPortSwitch / supportedSRS-TxPortSwitch-v1610 / srs-AntennaSwitchingBeyond4RX-r17, etc.), and setting xTyR in upper layer signaling / physical layer signaling may be interchangeable. In the present disclosure, UL transmission with a number of layers greater than four may be applied. The processing of the present disclosure may be applied to a UE supporting a number of layers greater than four. In the present disclosure, FG, UE capability, capability information, capability signaling, FG support, and capability reporting may be interchangeable.

[0114] In the present disclosure, port, SRS port, transmission port, SRS transmission port, antenna port, UE antenna port, reception port, antenna, UE antenna, and reception antenna may be read interchangeably.

[0115] In the present disclosure, ports #0 to #7 may be read as ports #1000 to #1007. That is, 1000 may be added to each port number of ports #0 to #7.

[0116] (Wireless Communication Method) <Embodiment A0> When receiving a configuration (e.g., a configuration of an SRS resource / SRS resource set) indicating that different SRS ports are mapped to different Orthogonal Frequency Division Multiplexing (OFDM) symbols (different SRS ports are sounded in different OFDM symbols) (e.g., FIG. 10), the SRS transmission power (e.g., P ＳＲＳ，ｂ，ｆ，ｃ ) may be equally divided into one or more specific units corresponding to the SRS resources, thereby maximizing the transmission power of the SRS.

[0117] [Option 1] The one or more specific units(s) may be at least one of the following options 1-1 to 1-3.

[0118] <<Option 1-1>> Port (SRS port). For example, P ＳＲＳ，ｂ，ｆ，ｃ When divided by the SRS port, the power per SRS port is P ＳＲＳ，ｂ，ｆ，ｃ / N1 (N is the number of SRS ports). The SRS ports (the number of SRS ports) may be configured / instructed to the UE by higher layer signaling / physical layer signaling, or may be determined by the UE.

[0119] <<Option 1-2>> OFDM symbol. For example, P ＳＲＳ，ｂ，ｆ，ｃ When divided into OFDM symbols set as SRS, the power per symbol is P ＳＲＳ，ｂ，ｆ，ｃ / N2 (N2 is the number of OFDM symbols that have been set). When repeated transmission is set, this OFDM symbol is the OFDM symbol that is used for one repetition.

[0120] <<Option 1-3>> A subset of SRS ports (OFDM symbols used for that subset). For example, P ＳＲＳ，ｂ，ｆ，ｃ is divided into subsets of SRS ports configured for SRS. The power per subset is P ＳＲＳ，ｂ，ｆ，ｃ / N3 (where N3 is a subset of the configured ports).

[0121] Options 1-1 to 1-3 may be implemented in appropriate combination. For example, when options 1-1 and 1-2 are combined, power may be distributed evenly to each SRS port set for each symbol. For example, when options 1-2 and 1-3 are combined, power may be distributed evenly to each subset of SRS ports set for each symbol.

[0122] [Option 2] The restriction / condition for applying this embodiment may be at least one of the following options 2-1 to 2-2. Satisfying the restriction / condition below may be an implicit instruction to apply this embodiment.

[0123] <<Option 2-1>> Use of SRS For example, when at least one of antenna switching, codebook, non-codebook, and beam management is set as the use of SRS, this embodiment may be applied.

[0124] <<Option 2-2>> Behavior of SRS in the time domain. For example, this embodiment may be applied to only aperiodic, only semi-persistent, only periodic, only a subset of {aperiodic, semi-persistent, periodic}, or all of {aperiodic, semi-persistent, periodic}.

[0125] [Examples of Description in Specifications] The present embodiment may be described in specifications as in the following examples 1 to 3. What is described in the specifications corresponds to what the terminal executes. － denotes a variable with a line over it, and may also be called P-bar.

[0126] Example 1: In the case of SRS, the UE transmits the signal with a transmission power of P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) equally among the antenna ports configured in the subset of SRS ports in the active UL BWPb of carrier f of serving cell c.

[0127] Example 2: In the case of an SRS in which port allocation using TDM is not configured, the UE transmits the SRS with a transmission power P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) equally among the SRS antenna ports in the active UL BWPb of carrier f of serving cell c.

[0128] In the case of SRS with port allocation using TDM, the UE transmits the ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) equally among the antenna ports configured in the subset of SRS ports in the active UL BWPb of carrier f of serving cell c.

[0129] Example 3: In the case of an SRS in which port allocation using TDM is not configured, the UE transmits the SRS with a transmission power P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) equally among the SRS antenna ports in the active UL BWPb of carrier f of serving cell c.

[0130] In the case of SRS configured with port allocation using TDM and when the UE indicates a specific UE capability report, the UE shall ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) equally among the antenna ports configured in the subset of SRS ports in the active UL BWPb of carrier f of serving cell c.

[0131] [Modification] When different SRS ports are measured in different OFDM symbols due to SRS resource configuration, the transmission power of the SRS (for example, P ＳＲＳ，ｂ，ｆ，ｃ ) is considered for each OFDM symbol in the SRS transmission opportunity.

[0132] For example, when a UE transmits an SRS based on the configuration of an SRS resource set in an active UL BWP b of carrier c of serving cell c using an SRS power control adjustment state with index l, the UE sets the SRS transmission power P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l).

[0133] <UE Power Amplifier (PA) Architecture> When transmitting a signal, the signal is sent from the baseband processor via upconversion to the PA, amplified, and sent to the antenna (Fig. 11). As shown in Fig. 12, several cases of transmit power are assumed. For example, in Case 1, the power of the amplified signal is 14 dBm at each port.

[0134] <Actual Maximum Transmission Power> In the case of Fig. 12, when ports #0 to #3 are assigned to one symbol and ports #4 to #7 are assigned to another symbol, the transmission power and maximum transmission power of each port can be considered as follows, for example: - In case 1 {14, 14, 14, 14, 14, 14} [dBm], the maximum transmission power is 20 dBm / symbol. - In case 2 {23, 23, 23, 23, 23, 23} [dBm], there is no restriction that the maximum transmission power be less than 23 dBm. - In case 3 {14, 14, 14, 14, 14, 23} [dBm], the maximum transmission power is 20 dBm for one symbol and 23 dBm for another symbol. In case 4 {14, 14, 14, 14, 20, 20} [dBm], the maximum transmission power is 20 dBm for one symbol and 23 dBm for another symbol. In case 5 {14, 14, 14, 17, 17, 17} [dBm], the maximum transmission power is 20 dBm for one symbol and 23 dBm for another symbol. In case 6 {14, 14, 15.3, 15.3, 15.3, 15.3, 15.3}, the maximum transmission power is 20 dBm or more for one symbol and 21.3 dBm or more for another symbol.

[0135] Depending on the UE PA architecture, different transmit powers are available for different OFDM symbols used for SRS resources, which may affect how the CSI is measured over a subset of ports.

[0136] <Analysis> In multiple OFDM symbols used for SRS resources, one P ＣＭＡＸ is considered as the upper limit of the transmit power. However, due to the UE PA architecture, the actual maximum transmit power varies for each OFDM symbol (different ports are transmitted).

[0137] For example, conservative P ＣＭＡＸ For example, in case 3 of the UE PA architecture in FIG. 12, the symbols at SRS ports #0-#3 cannot achieve 23 dBm, so P ＣＭＡＸ It may be possible to set the value to 20 dBm.

[0138] That is, it is preferable that the UE adjusts the SRS transmission power based on the type of SRS port / PA architecture of the UE. Hereinafter, this adjustment method will be specifically described in embodiments A1 to A3.

[0139] <Embodiment A1> The UE may set the maximum transmit power (e.g., P ) for SRS transmission to reflect the actual maximum transmit power based on the type of SRS port / PA architecture of the UE. ＣＭＡＸ For example, in Rel. 17, power adjustment may be performed for P ＣＭＡＸ Although the constraint of is specified, a different formula may be used in this embodiment.

[0140] [Option 1] The power adjustment coefficient is at least one of the following options 1-1 and 1-2. Option 1-1: ΔT in equation (2) ＲｘＳＲＳ is applied as is. Option 1-2: A new parameter is added to equation (2). For example, △T ＲｘＳＲＳ＿ＮＥＷ The following formula may be applied:

[0141] [Option 2] The location where the coefficient is applied may be at least one of the following options 2-1 to 2-3. For example, a specific coefficient may be applied (for example, by addition / subtraction / multiplication) to at least one of the formulas of options 2-1 to 2-3. The formulas of options 2-1 to 2-3 may be the above formula (2) or (3). Option 2-1: P ＣＭＡＸ、ｆ、ｃ Inequality to determine the lower band (P ＣＭＡＸ、Ｌ、ｆ、ｃ ) formula to determine the upper band (P ＣＭＡＸ、Ｈ、ｆ、ｃ ) is the formula that determines

[0142] [Option 3] The conditions for applying this embodiment are at least one of the following options 3-1 and 3-2. Option 3-1: This embodiment is applied to an SRS whose port index is greater than (or smaller than) a predetermined threshold. For example, in an 8-port SRS, if there are four ports per subset / OFDM symbol, this example of this embodiment may be applied to SRS ports #4-#7. For example, in an 8-port SRS, if there are two ports per subset, this example of this embodiment may not be applied only to SRS ports #6 and #7. Option 3-2: This option is applied only to SRSs whose port index is within a specific subset.

[0143] According to this embodiment, the transmit power of the SRS is maximized based on the actual PA architecture.

[0144] <Embodiment A2> The UE may perform power adjustments to the value associated with the TPC (TPC command) for SRS transmission to reflect the actual maximum transmit power based on the type of SRS port / PA architecture of the UE. For example, in Rel. 17, the h corresponding to TPC as shown in Equation (2) above is used. ｂ，ｆ，ｃ (i) is used, but in this embodiment, h ｂ，ｆ，ｃ A particular coefficient may be applied (eg, added / subtracted / multiplied) to (i, l).

[0145] [Option 1] The power adjustment coefficient is at least one of the following options 1-1 and 1-2. Option 1-1: ΔT in equation (2) ＲｘＳＲＳ is applied as is. Option 1-2: A new parameter is added to equation (2). For example, △T ＲｘＳＲＳ＿ＮＥＷ The above formula (3) with the addition of

[0146] [Option 2] The place where the coefficient is applied may be at least one of the following options 2-1 to 2-2. For example, a specific coefficient may be applied (for example, by adding / subtracting / multiplying) to at least one of the formulas in options 2-1 to 2-2. Option 2-1: The formula under formula (2) or (3) (for example, P ０＿ＳＲＳ、ｂ、ｆ、ｃOption 2-2: The formula above (2) or (3) (e.g., P ＣＭＡＸ、ｆ、ｃ after).

[0147] [Option 3] The conditions for applying this embodiment are at least one of the following options 3-1 and 3-2. Option 3-1: This embodiment is applied to an SRS whose port index is greater than (or smaller than) a predetermined threshold. For example, in an 8-port SRS, if there are four ports per subset / OFDM symbol, this example of this embodiment may be applied to SRS ports #4-#7. For example, in an 8-port SRS, if there are two ports per subset, this example of this embodiment may not be applied only to SRS ports #6 and #7. Option 3-2: This option is applied only to SRSs whose port index is within a specific subset.

[0148] According to this embodiment, the transmit power of the SRS is maximized based on the actual PA architecture.

[0149] <Embodiment A3> The UE adjusts the calculated SRS transmission power (e.g., P ) to reflect the actual maximum transmission power based on the type of SRS port / PA architecture of the UE. ＳＲＳ、ｂ，ｆ，ｃ (i, q ｓ , l)) may be power adjusted.

[0150] [Option 1] The power adjustment coefficient is at least one of the following options 1-1 and 1-2. Option 1-1: ΔT in equation (2) ＲｘＳＲＳ is applied as is. Option 1-2: A new parameter is added to equation (2). For example, △T ＲｘＳＲＳ＿ＮＥＷ The above formula (3) with the addition of

[0151] [Option 2] The place where the coefficient is applied may be the formula of Option 2-1 below. For example, a specific coefficient may be applied (e.g., added / subtracted / multiplied) to the formula of Option 2-1. Option 2-1: P in formula (2) or (3) ＳＲＳ、ｂ，ｆ，ｃ (i, q ｓ , l).

[0152] [Option 3] The conditions for applying this embodiment are at least one of the following options 3-1 and 3-2. Option 3-1: This embodiment is applied to an SRS whose port index is greater than (or smaller than) a predetermined threshold. For example, in an 8-port SRS, if there are four ports per subset / OFDM symbol, this example of this embodiment may be applied to SRS ports #4-#7. For example, in an 8-port SRS, if there are two ports per subset, this example of this embodiment may not be applied only to SRS ports #6 and #7. Option 3-2: This option is applied only to SRSs whose port index is within a specific subset.

[0153] According to this embodiment, the transmit power of the SRS is maximized based on the actual PA architecture.

[0154] <Variations> The examples of embodiment A1 to embodiment A3 may be commonly applied to a set of SRS transmissions. The "set of SRS transmissions" may be replaced with at least one of the following: (1) A subset of all SRS ports to be configured; (2) All repetitions of SRS transmission; (3) All SRS symbols. In this case, for example, the transmission power of the OFDM symbols will be the same, which simplifies the implementation of the terminal; (4) A part of the subset(s) of SRS ports to be configured; (5) A part of the SRS ports.

[0155] When (1) to (3) are applied, the transmission power of the SRS is the same for a specific SRS transmission configured by the SRS resource, which simplifies the implementation of the terminal. Also, the UE may apply each embodiment by selecting the minimum / maximum power value (the SRS corresponding to the power value) calculated for each SRS subset / SRS repetition / SRS symbol.

[0156] P per port (or per port subset) ＣＭＡＸ may be defined.

[0157] The method of determining / identifying option 3-2 "SRS with port index in specific subset" in embodiments A1 to A3 may be at least one of the following (1) to (3).

[0158] (1) The UE transmits the SRS ports in each subset and the number of subsets as UE capability information. The UE may configure / instruct a specific subset by RRC / MAC CE / DCI. (2) If the SRS ports are divided into multiple subsets, the UE may configure / instruct an identifier of each subset by RRC / MAC CE / DCI. The UE may also configure / instruct the subsets to be divided by RRC / MAC CE / DCI. (3) The UE may configure / instruct an association between an SRS port and an OFDM symbol used for its transmission by RRC / MAC CE / DCI. SRS ports included in the same OFDM symbol may be included in the same subset.

[0159] <Embodiment A4> In embodiments A1 to A3, the UE may transmit / report the coefficient used for adjustment using at least one of the following optional report / information / signal / channel, etc. (the coefficient may be included in the information / signal / channel, etc.):

[0160] Option 4-1-1: UE capability information. Option 4-1-2: Report in MAC CE (e.g., Power Headroom Report (PHR) / Buffer Status Report (BSR)) on UL PUSCH. Option 4-1-3: UCI on PUCCH. Option 4-1-4: UCI on PUSCH.

[0161] The UE may transmit the specific units / locations in which to apply one or more coefficients along with the coefficients, or this may be predefined in the specification.

[0162] [Variations] Information related to the UE's PA architecture may be transmitted / reported using the methods of Options 4-1-1 to 4-1-2. This improves the gNB's awareness of the UE's transmission power. In this case, the "information related to the UE's PA architecture" may be at least one of the following: Option 4-2-1: Maximum output power per port. Option 4-2-2: PA architecture identification information (e.g., case index in FIG. 12).

[0163] According to this embodiment, the quality of UL / DL channel measurements based on SRS is improved.

[0164] <Embodiment A5> When a UE receives both a TDM port distribution configuration (different SRS ports are mapped to OFDM symbols) and an SRS repetition configuration, the UE may drop only some of the SRS (SRS symbols) in the SRS repetition depending on collisions with other UL transmissions. Note that the TDM port distribution may also indicate mapping different SRS ports to different OFDM symbols (i.e., TDM), as shown in the example of Fig. 10 .

[0165] The UE may drop only SRS transmissions from the SRS port in symbols that overlap with other UL transmissions, and may not drop SRS transmissions from the SRS port in other symbols. For example, in the example of FIG. 13, the UE drops only SRSs #2 and #3. This reduces the number of SRSs to be dropped compared to dropping all SRSs (e.g., all SRSs in repeated transmissions corresponding to a specific SRS). Furthermore, channel measurement of all ports may be possible regardless of overlap with other UL transmissions.

[0166] For example, when SRS and SRS repetition using TDM port distribution are configured simultaneously, the UE may apply the following Option 5-1 or 5-2 as a collision handling rule for SRS and other UL transmissions. Option 5-1: If an SRS symbol including repetition collides with another UL transmission, the UE drops all SRS transmissions in the repeated transmission. Option 5-2: If any SRS symbol including repetition collides with another UL transmission, the UE drops only all SRS transmissions that actually collide with other UL transmissions.

[0167] According to this embodiment, SRS transmission opportunities (corresponding to opportunities to measure CSI) are maximized. For example, when this embodiment is combined with embodiments A1 to A3 and A4, the NW (base station) can measure eight ports assuming appropriate transmission power and obtain accurate UL measurement results.

[0168] [Supplementary Information] When UL transmissions overlap, the UE may drop UL transmissions with lower priority according to a predetermined priority. For example, the following UL transmissions may be assigned higher priority. The priority may be defined in the specification or configured / indicated to the UE by higher layer signaling / physical layer signaling: PRACH transmission on the PCell; PUCCH or PUSCH transmission with a higher priority index; PUCCH or PUSCH transmission with the same priority index; At least one of PUCCH transmission with HARQ-ACK information of the priority index, SR, link recovery request (LRR), and PUSCH transmission with HARQ-ACK information; PUCCH transmission with CSI or PUSCH transmission with CSI; PUSCH transmission without HARQ-ACK information or CSI of the priority index, PUSCH transmission in a type 2 random access procedure, and PUSCH transmission on the PCell. - SRS transmission with higher priority than semi-persistent / periodic SRS or PRACH transmission in a serving cell other than the PCell.

[0169] In the case of equal priority and in operation with carrier aggregation, the UE may prioritize transmission on the primary cell of the MCG or SCG over transmission on the secondary cell. In the case of equal priority and in operation with two UL carriers, the UE may prioritize transmission on the carrier on which the UE is configured to transmit PUCCH. If PUCCH is not configured on either of the two UL carriers, the UE may prioritize transmission on the non-supplementary UL carrier.

[0170] <8-Port TDM> When 8 ports are distributed using TDM, it is considered that the port subsets are cyclically mapped and the same set of subcarriers is used within one subset. In TDM-based resource mapping using 8-port SRS resources in an SRS resource set with the usage 'codebook' or 'antenna switching' and a TDM factor s, if s subsets of ports are mapped to m ≥ 2 OFDM symbols within one slot according to the pattern {{1, 2, ..., s}, ..., {1, 2, ..., s}} (total m / s groups of {1, 2, ..., s}), the SRS resources in each of the m / s groups of {1, 2, ..., s} use the same set of subcarriers. If consecutive groups of {1, 2, ..., s} are configured as repeating groups, the SRS transmissions of the consecutive groups use the same set of subcarriers. This distribution may be applied to SRS resources that use frequency hopping (FH) / resource block-level partial frequency sounding (RPFS) or to SRS resources that do not use FH / RPFS.

[0171] In the example of Fig. 14, 8-port SRS are distributed to s = 2 consecutive symbols, with 4 ports per group, and are TDM-multiplied. The group is repeated m / s = 2 times, and the two groups are mapped to m = 4 symbols in one slot.

[0172] In the present disclosure, one subset (port subset) may correspond to one symbol (OFDM symbol, SRS symbol) and 8 / s ports. In the present disclosure, one group may correspond to s symbols, s subsets, and 8 ports. In the present disclosure, all SRS symbols (Ns symbols) may correspond to m symbols and m / s groups.

[0173] SRS repetition and frequency hopping SRS repetition and intra-slot frequency hopping are determined based on several parameters: Ns (number of symbols) {n1, n2, n4, n8, n10, n12, n14}: total number of SRS symbols in one slot. R (repetition factor) {n1, n2, n4, n5, n6, n7, n8, n10, n12, n14}: number of repeated SRS transmissions.

[0174] Ns and R may follow at least one of the following examples: Example 1: If R=Ns, all SRS symbols (Ns symbols) use the same set of subcarriers. In the example of Fig. 15A, Ns=4 and R=4.

[0175] - Example 2: When R = 1, different SRS symbols use different sets of subcarriers. In the example of Fig. 15B, Ns = 4 and R = 1.

[0176] - Case 3: R adjacent SRS symbols use the same set of subcarriers if R>=2 and Ns>=4. In the example of Fig. 15C, Ns=4, R=2.

[0177] <Analysis> The relationship between the following multiple settings (parameters) has not been fully considered: - Number of repetitions R - Number of SRS symbols Ns - Number of port subsets s (new parameter for TDM 8-port SRS).

[0178] The relationship between TDMed SRS ports and comb offset hopping has not been fully explored. It is unclear whether comb offset hopping occurs per symbol or per cycle of a port subset.

[0179] <UE Operation> A UE may receive information (e.g., configuration / instruction) regarding sounding reference signal (SRS) transmission using multiple ports greater than four. Based on the information, the UE may determine at least one of the number of repetitions of the SRS transmission (e.g., R), the number of symbols to which the multiple ports are mapped (e.g., number of port subsets, s), and the number of ports among the multiple ports to be mapped to one symbol (e.g., number of ports in one port subset, number of ports / s).

[0180] The UE may receive information (e.g., configuration / instruction) regarding sounding reference signal (SRS) transmission using multiple ports greater than 4. The UE may control hopping of comb offsets in the SRS transmission based on the information.

[0181] When TDM port mapping for SRS using more than four ports is configured, the UE may repeatedly transmit an SRS of one symbol corresponding to one port subset R times, or may repeatedly transmit an SRS of s symbols corresponding to s port subsets R times, or may repeatedly transmit an SRS of m symbols R times.

[0182] <Embodiment B1> When TDM port mapping for SRS using more than four ports is configured, a restriction on the RRC parameter R (number of repetitions for SRS) may be applied. According to this embodiment, no mismatch between SRS repetitions and port subsets occurs, and all subsets can be repeated the same number of times.

[0183] - Option 1: The constraint may be at least one of the following options: -- Option 1-1: R can take any of the existing candidate values. That is, R can be 1, 2, 4, 5, 6, 7, 8, 10, 12, or 14. -- Option 1-2: R can take any of the existing candidate values ​​other than 1. That is, R can be 2, 4, 5, 6, 7, 8, 10, 12, or 14. -- Option 1-3: R can only take even values ​​of the existing candidate values. That is, R can be 2, 4, 6, 8, 10, 12, or 14. -- Option 1-4: R is less than or equal to Ns (the number of SRS symbols). -- Option 1-5: R can be a multiple of the number s of port subsets. For example, if s=2, R can be the same set as in Option 1-3. For example, if s=4, R can be 4, 8, or 12.

[0184] - Option 2: The constraint may be applied by at least one of the following options: -- Option 2-1: Explicit RRC parameter. -- Option 2-2: RRC parameter configuring SRS with more than four ports. -- Option 2-3: DL MAC CE indication. -- Option 2-4: DCI indication. The DCI may be a DCI that triggers A-SRS transmission.

[0185] <Embodiment B2> When TDM port mapping for an SRS using more than four ports is configured, at least one of the number of port subsets s and the number of ports in one port subset (i.e., number of ports / s) may be determined based on at least the number of repetitions R. According to this embodiment, it is possible to reduce (minimize) the configuration overhead required for a TDM-based 8-port SRS.

[0186] - Option 1: At least one of the number of port subsets s and the number of ports in one port subset (i.e., number of ports / s) may follow at least one of the following options: -- Option 1-1: The number of port subsets s is the same as R. In this case, a constraint on R may be applied. R may be less than or equal to the maximum number of port subsets. At least one constraint from Options 1-1 to 1-5 in embodiment B1 may further be applied to R.

[0187] - Option 2: The number of port subsets, s, is R / X, where X may be configured by an RRC parameter and may be selected from 2, 4, or 8. In this case, the value of R may need to be an integer divisible by the selected value of X (or may be a multiple of the selected value of X).

[0188] <Embodiment B3> When TDM port mapping for SRS using more than four ports is configured, at least one of the number of port subsets s and the number of ports in one port subset (i.e., the number of ports / s) may be determined based on explicit RRC parameters. The RRC parameters for SRS transmission may indicate at least one of the number of port subsets s and the number of ports in one port subset (i.e., the number of ports / s). This embodiment enables flexible configuration of at least one of the number of port subsets s and the number of ports in one port subset (i.e., the number of ports / s).

[0189] <Embodiment B4> When TDM port mapping for SRS using more than four ports is configured, comb offset hopping based on a specific granularity may be performed. According to this embodiment, the UE / base station can appropriately perform comb offset hopping.

[0190] - Option 1: The specific granularity may be at least one of the following options: -- Option 1-1: Comb offset hopping is performed for each OFDM symbol (e.g., FIG. 16A). -- Option 1-2: Comb offset hopping is performed for each set of SRS symbols. The set of SRS symbols is the set of SRS symbols required for transmission on all SRS ports. The number of SRS symbols in the set may be equal to the number of port subsets, s (e.g., FIG. 16B). -- Option 1-3: Comb offset hopping is performed for each R symbols. R may be a repetition factor (e.g., any of FIGS. 15A to 15C). Option 1-3 may be applied to SRS using four or fewer ports.

[0191] - Option 2: The configurability of the aforementioned Options 1-1 to 1-3 may follow at least one of the following options: -- Option 2-1: Only one option of Options 1-1 to 1-3 is supported. -- Option 2-2: All options of Options 1-1 to 1-3 are supported, with one option of the plurality of options being configured by RRC. -- Option 2-3: All options of Options 1-1 to 1-3 are supported, with a subset of the plurality of options being configured by RRC, with one option of the subset being indicated by MAC CE / DCI. -- Option 2-4: Only a subset of Options 1-1 to 1-3 is supported, with one option of the subset being configured by RRC.

[0192] <Embodiment B5> When TDM port mapping for SRS using more than four ports is configured, comb offset hopping may not be configured. That is, the specification may specify that the UE does not expect TDM port mapping and comb offset hopping to be configured simultaneously. According to this embodiment, the UE can appropriately configure TDM port mapping or comb offset hopping.

[0193] <Analysis> As mentioned above, support for more than four layers (e.g., eight layers) in UL transmission from a UE is being considered for Rel. 18 and later. In particular, for codebook and antenna switching applications, TDMed eight-port SRS is supported.

[0194] Four ports are allocated per OFDM symbol, and two (or more) OFDM symbols are consumed / utilized for one cycle of eight ports.

[0195] Fig. 17 shows an example of port allocation using TDM. More specifically, as shown in Fig. 17, SRS ports #0, #1, #4, and #5 are assigned to one OFDM symbol, and SRS ports #2, #3, #6, and #7 are assigned to another OFDM symbol.

[0196] Furthermore, the specification may describe the 8-port SRS for antenna switching as follows: Figure 18 is an example of the description of the specification regarding the 8-port SRS for antenna switching.

[0197] Here, xTyR may mean that the UE can transmit SRS using x antenna ports out of a total of y antennas, as described above. Also, when x and y in "xTyR" have the same value, it may be expressed as xT = xR (e.g., 4T = 4R).

[0198] Example 1: If xTyR = 1T2R, 1T4R, 2T4R, 1T6R, 1T8R, 2T6R, 2T8R, 4T8R, or 8T8R, the UE should not expect more than one (i.e., multiple) SRS resource set with higher layer parameters set to antenna switching as its usage to be configured / triggered in the same slot.

[0199] Example 2: For 1T=1R, 2T=2R, 4T=4R, and 8T=8R, the UE should not expect more than one (i.e., multiple) SRS resource sets with higher layer parameters set to antenna switching as their usage to be configured / triggered in the same slot.

[0200] The above examples show different cases, in which the corresponding relationship of antenna switching settings (patterns) is unclear.

[0201] For example, Example 1 may assume a downgrading configuration or a configuration that consumes / utilizes multiple OFDM symbols for antenna switching, and Example 2 may assume a non-downgrading configuration or a configuration that consumes / utilizes only one OFDM symbol for antenna switching.

[0202] Therefore, this disclosure clarifies limitations / restrictions in 8-port SRS for antenna switching.

[0203] The embodiments of the present disclosure can be broadly categorized as follows: Embodiment 1: Restriction on the number of SRS resource sets for an 8-port SRS. Embodiment 2: Restriction on the number of SRS resource sets for a non-TDMed 8-port SRS. Embodiment 3: Restriction on the number of SRS resource sets for a TDMed 8-port SRS.

[0204] In the present disclosure, TDMed (Time Division Multiplexed) may mean that eight ports are configured for an SRS resource / SRS resource set, and that TDM is configured.

[0205] In the present disclosure, TDMed, applying TDM, and setting TDM may be read interchangeably.

[0206] In the present disclosure, non-TDMed may mean that 8 ports are configured for an SRS resource / SRS resource set and no TDM is configured.

[0207] In the present disclosure, non-TDMed, not applying TDM (not applied), not setting TDM (not set), and "non-TDM" may be read interchangeably.

[0208] In the present disclosure, the 8-port SRS, the TDM 8-port SRS, and the non-TDM 8-port SRS may be read interchangeably.

[0209] In the present disclosure, slots and symbols may be read interchangeably.

[0210] In the present disclosure, the terms SRS resource set and SRS resource may be interpreted as interchangeable.

[0211] <Embodiment C1> This embodiment relates to a restriction on the number of SRS resource sets for an 8-port SRS.

[0212] When the UE is configured to use antenna switching for 8-port SRS, the UE may apply either a slot-based restriction or a symbol-based restriction to the number of SRS resource sets.

[0213] This allows for flexible control of the constraints imposed on the number of SRS resource sets in antenna switching for 8-port SRS, depending on the case, thereby avoiding excessive constraints on the number of SRS resource sets.

[0214] Here, "per-slot constraint" may refer to the number of SRS resource sets configured / triggered in one slot from the perspective of a single UE.

[0215] Also, "per-symbol constraint" may refer to the number of SRS resource sets configured / triggered within one symbol from the perspective of a single UE.

[0216] <Option 1> The constraints for each slot are shown as examples in Opt1-1 to Opt1-2 below.

[0217] (Opt1-1) The number of SRS resource sets in one slot may be a maximum of one.

[0218] (Opt1-2) The number of SRS resource sets in one slot may be up to X (e.g., X = 1). Here, the value of X may be predefined by a specification, configured / indicated by higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI), or based on a combination thereof. Also, different X values ​​may be supported depending on UE capabilities.

[0219] <Option 2> The constraints for each symbol are shown in Opt2-1 to Opt2-2 below.

[0220] (Opt2-1) The number of SRS resource sets in one symbol may be a maximum of one.

[0221] (Opt2-2) The number of SRS resource sets in one symbol may be up to X (e.g., X = 1). Here, the value of X may be predefined by a specification, configured / indicated by higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI), or based on a combination thereof. Also, different X values ​​may be supported depending on UE capabilities.

[0222] According to the present embodiment described above, the UE can appropriately control the application of constraints to the number of SRS resource sets.

[0223] <Embodiment C2> This embodiment relates to a restriction on the number of SRS resource sets for a non-TDMed 8-port SRS. Embodiment C1 can be applied to this embodiment by replacing "8-port SRS" with "non-TDMed 8-port SRS."

[0224] When the UE is configured to use antenna switching for non-TDM 8-port SRS, it may apply either a per-slot constraint or a per-symbol constraint to the number of SRS resource sets.

[0225] This allows for flexible control of the constraints on the number of SRS resource sets in antenna switching for non-TDM 8-port SRS, depending on the case, thereby avoiding excessive constraints on the number of SRS resource sets.

[0226] Here, "per-slot constraint" may refer to the number of SRS resource sets configured / triggered in one slot from the perspective of a single UE.

[0227] Also, "per-symbol constraint" may refer to the number of SRS resource sets configured / triggered within one symbol from the perspective of a single UE.

[0228] <Option 1> The constraints for each slot are shown as examples in Opt1-1 to Opt1-2 below.

[0229] (Opt1-1) The number of SRS resource sets in one slot may be a maximum of one.

[0230] (Opt1-2) The number of SRS resource sets in one slot may be up to X (e.g., X = 1). Here, the value of X may be predefined by a specification, configured / indicated by higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI), or based on a combination thereof. Also, different X values ​​may be supported depending on UE capabilities.

[0231] <Option 2> The constraints for each symbol are shown in Opt2-1 to Opt2-2 below.

[0232] (Opt2-1) The number of SRS resource sets in one symbol may be a maximum of one.

[0233] (Opt2-2) The number of SRS resource sets in one symbol may be up to X (e.g., X = 1). Here, the value of X may be predefined by a specification, configured / indicated by higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI), or based on a combination thereof. Also, different X values ​​may be supported depending on UE capabilities.

[0234] According to the present embodiment described above, the UE can appropriately control the application of constraints to the number of SRS resource sets.

[0235] <Embodiment C3> This embodiment relates to a restriction on the number of SRS resource sets for a TDMed 8-port SRS. Embodiment C1 can be applied to this embodiment by replacing "8-port SRS" with "TDMed 8-port SRS."

[0236] When the UE is configured to use antenna switching for TDM 8-port SRS, it may apply either a per-slot constraint or a per-symbol constraint to the number of SRS resource sets.

[0237] This allows for flexible control of the constraints imposed on the number of SRS resource sets in antenna switching for TDM 8-port SRS, depending on the case, thereby avoiding excessive constraints on the number of SRS resource sets.

[0238] Here, "per-slot constraint" may refer to the number of SRS resource sets configured / triggered in one slot from the perspective of a single UE.

[0239] Also, "per-symbol constraint" may refer to the number of SRS resource sets configured / triggered within one symbol from the perspective of a single UE.

[0240] <Option 1> The constraints for each slot are shown as examples in Opt1-1 to Opt1-2 below.

[0241] (Opt1-1) The number of SRS resource sets in one slot may be a maximum of one.

[0242] (Opt1-2) The number of SRS resource sets in one slot may be up to X (e.g., X = 1). Here, the value of X may be predefined by a specification, configured / indicated by higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI), or based on a combination thereof. Also, different X values ​​may be supported depending on UE capabilities.

[0243] <Option 2> The constraints for each symbol are shown in Opt2-1 to Opt2-2 below.

[0244] (Opt2-1) The number of SRS resource sets in one symbol may be a maximum of one.

[0245] (Opt2-2) The number of SRS resource sets in one symbol may be up to X (e.g., X = 1). Here, the value of X may be predefined by a specification, configured / indicated by higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI), or based on a combination thereof. Also, different X values ​​may be supported depending on UE capabilities.

[0246] According to the present embodiment described above, the UE can appropriately control the application of constraints to the number of SRS resource sets.

[0247] <Note> Different options may be supported simultaneously between embodiment C2 (non-TDM 8-port SRS) and embodiment C3 (TDM 8-port SRS). That is, different types of constraints may be supported depending on whether TDM is applied to the 8-port SRS transmission (whether TDM is applied / configured). Specifically, per-symbol constraints (e.g., up to one SRS resource set per symbol) may be supported for the non-TDM 8-port SRS, and per-slot constraints (e.g., up to one SRS resource set per slot) may be supported for the TDM 8-port SRS.

[0248] 18, the specification may be described as follows (see FIG. 19): FIG. 19 is a specification description example relating to an 8-port SRS for antenna switching.

[0249] Example 1: If TDM is configured for the associated SRS resource and xTyR=1T2R, 1T4R, 2T4R, 1T6R, 1T8R, 2T6R, 2T8R, 4T8R, or 8T8R, the UE shall not expect more than one (i.e., multiple) SRS resource set with higher layer parameters configured with antenna switching as its usage to be configured / triggered in the same slot.

[0250] Example 2: If TDM is configured for the associated SRS resources and 1T=1R, 2T=2R, 4T=4R, 8T=8R, the UE should not expect more than one (i.e., multiple) SRS resource sets with higher layer parameters configured with antenna switching as their usage to be configured / triggered in the same slot.

[0251] <Analysis> A Rel. 15 UE can only support the SRS antenna switching configuration of supportedSRS-TxPortSwitch among the Rel. 15 / 16 SRS antenna switching configurations (configuration, SRS Tx port switching pattern, pattern) in Figure 20. In other words, the UE only supports the SRS antenna switching configuration that uses all implemented receive (Rx) antennas to perform sounding for DL ​​CSI acquisition. In this disclosure, this configuration may be referred to as a mandatory configuration.

[0252] A Rel. 16 UE can support the supportedSRS-TxPortSwitch-v1610 pattern in addition to the supportedSRS-TxPortSwitch pattern among the Rel. 15 / 16 patterns described above. That is, the UE can support an SRS antenna switching configuration (e.g., supportedSRS-TxPortSwitch-v1610) that performs sounding for DL ​​CSI acquisition using fewer receive antennas than the number of implemented receive antennas. In this disclosure, this SRS antenna switching configuration / pattern may be referred to as a downgrading configuration.

[0253] Of the Rel. 15 / 16 patterns mentioned above, the following settings are mandatory: 't1r2' for 1T2R 't2r4' for 2T4R 't1r4' for 1T4R 't1r1' for 1T=1R 't2r2' for 2T=2R 't4r4' for 4T=4R

[0254] Among the above-mentioned Rel. 15 / 16 patterns, the following settings are downgrade settings.・'t1r1-t1r2' for 1T=1R / 1T2R ・'t1r1-t1r2-t1r4' for 1T=1R / 1T2R / 1T4R ・'t1r4-t2r4' for 1T4R / 2T4R ・'t1r1-t1r2-t2r2-t2r4' for 1T=1R / 1T2R / 2T=2R / 2T4R ・'t1r1-t1r2-t2r2-t1r4-t2r4' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R ・'t1r1-t2r2' for 1T=1R / 2T=2R・'t1r1-t2r2-t4r4' for 1T=1R / 2T=2R / 4T=4R

[0255] For example, if the UE reports 't1r1-t1r2', it has a 1T2R antenna implemented, but can configure SRS antenna switching using only 1T1R.

[0256] For codebook and antenna switching usage, Rel. 18 supports: - 8-port SRS transmission without TDM, where all 8 ports are transmitted within one OFDM symbol; - 8-port SRS transmission with TDM, where 4 ports are transmitted within one OFDM symbol and the other 4 ports are transmitted within another OFDM symbol.

[0257] Downgrading configurations are supported for antenna switching (AS) SRS. For example, a UE supporting t4r4 (4 Tx ports and 4 Rx ports) can support antenna switching based on t1r1 and t2r2 (antenna switching using fewer ports than total antennas / total Rx antennas / maximum Rx ports) according to the corresponding Rel. 16 UE capability signaling.

[0258] The following settings are supported up to Rel. 17: - Rel. 15: {t1r2, t1r4, t2r4, t2r2, t4r4, t1r4-t2r4} (candidate values ​​of supportedSRS-TxPortSwitch in srs-TxSwitch) - Rel. 16: {t1r1-t1r2, t1r1-t1r2-t1r4, t1r1-t1r2-t2r2-t2r4, t1r1-t2r2, t1r1-t2r2-t4r4, t1r1-t1r2-t2r2-t1r4-t2r4} (candidate values ​​of supportedSRS-TxPortSwitch-v1610 in srs-TxSwitch-v1610) - Rel. 17: {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8} (candidate value of supportedSRS-TxPortSwitchBeyond4Rx-r17 in srs-AntennaSwitchingBeyond4RX-r17)

[0259] For UEs that support 8-Tx SRS transmission for antenna switching, support for downgrade configurations is unclear. In Rel. 16, when the maximum number of Tx ports is equal to the maximum number of Rx ports, if downgrade configurations are supported, the number of Tx ports is equal to the number of Rx ports in all downgrade configurations. For example, supportedSRS-TxPortSwitch=t2r2 and supportedSRS-TxPortSwitch-v1610=t1r1-t2r2, and supportedSRS-TxPortSwitch=t4r4 and supportedSRS-TxPortSwitch-v1610=t1r1-t2r2-t4r4. On the other hand, technically, if a UE supports the t8r8 setting, the UE may support any of {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8}.

[0260] <Embodiment D1> This embodiment relates to a (downgrade) configuration for antenna switching SRS supported by a UE that supports 8Tx SRS transmission.

[0261] A UE that supports 8Tx SRS transmission for antenna switching may support one or more downgrade configurations. By limiting the number of Rx ports, the SRS transmit power per port can be increased. SRS transmission for antenna switching may follow at least one of the following options:

[0262] - Option 1: Candidates for downgrade configuration may be at least one of several options 1-x below: -- Option 1-1: t1r1. One Tx port and one Rx port are used for antenna switching. -- Option 1-2: t2r2. Two Tx ports and two Rx ports are used for antenna switching. -- Option 1-3: t1r2. One Tx port and two Rx ports are used for antenna switching. -- Option 1-4: t4r4. Four Tx ports and four Rx ports are used for antenna switching. -- Option 1-5: t2r4. Two Tx ports and four Rx ports are used for antenna switching. -- Option 1-6: t1r4. One Tx port and four Rx ports are used for antenna switching. -- Option 1-7: t2r6. Two Tx ports and six Rx ports are used for antenna switching. -- Option 1-8: t1r6. One Tx port and six Rx ports are used for antenna switching. -- Option 1-9: t4r8. Four Tx ports and eight Rx ports are used for antenna switching. -- Option 1-10: t2r8. Two Tx ports and eight Rx ports are used for antenna switching. -- Option 1-11: t1r8. One Tx port and eight Rx ports are used for antenna switching. -- Option 1-12: t8r8. Eight Tx ports and eight Rx ports are used for antenna switching. -- Option 1-13: t4r6. Four Tx ports and six Rx ports are used for antenna switching.

[0263] A UE that supports 8Tx SRS transmission for antenna switching may support at least one of the following examples, which are combinations of several Options 1-x: -- Example 1: At least one of Option 1-1, Option 1-2, Option 1-4, and Option 1-12. The UE may only support Option 1-x configurations that have the same number of ports for both Tx and Rx. For example, Option 1-1, Option 1-2, and Option 1-4. -- Example 2: All Options 1-x. -- Example 3: All Options 1-x except Option 1-13.

[0264] - Option 2: Restrictions on the applicability of embodiment 1 may be at least one of several options 2-x below: -- Option 2-1: Embodiment 1 is applicable only to 8Tx SRS without TDM. -- Option 2-2: Embodiment 1 is applicable only to 8Tx SRS with TDM. -- Option 2-3: Embodiment 1 is applicable to both 8Tx SRS with TDM and 8Tx SRS without TDM.

[0265] Option 3: The time domain behavior to which the first embodiment is applicable may be at least one of the following several options 3-x: -- Option 3-1: Periodic SRS (P-SRS) -- Option 3-2: Semi-persistent SRS (SP-SRS) -- Option 3-3: Aperiodic SRS (A-SRS)

[0266] The following procedure may be specified in the specification as a UE sounding procedure for DL ​​CSI acquisition: - If a UE is configured with the higher layer parameter usage set to 'antennaSwitching' in SRS-ResourceSet, the UE may use multiple settings depending on the indicated UE capability supportedSRS-TxPortSwitch ('t1r2' for 1T2R, 't1r1-t1r2' for 1T=1R / 1T2R, 't2r4' for 2T4R, 't1r4' for 1T4R, 't8r8' for 8T8R, 't1r1-t1r2-t1r4' for 1T=1R / 1T2R / 1T4R, 't1r4-t2r4' for 1T4R / 2T4R, 't1r1-t1r2-t2r2-t2r4' for The UE may configure only one of the following: 1T=1R / 1T2R / 2T=2R / 2T4R, 't1r1-t1r2-t2r2-t1r4-t2r4' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R, 't1r1' for 1T=1R, 't2r2' for 2T=2R, 't1r1-t2r2' for 1T=1R / 2T=2R, 't4r4' for 4T=4R, or 't1r1-t2r2-t4r4' for 1T=1R / 2T=2R / 4T=4R) depending on the indicated UE capability supportedSRS-TxPortSwitchBeyond4Rx. 't1r1' for 1T=1R, 't2r2' for 2T=2R, 't4r4' for 4T=4R, 't2r4' for 2T4R, 't1r4' for 1T4R, 't2r6' for 2T6R, 't1r6' for 1T6R, 't4r8' for 4T8R, 't2r8' for 2T8R, 't1r8' for 1T8R, or the UE may be configured with only one of the following configurations ('t1r1' for 1T=1R, 't2r2' for 2T=2R, 't4r4' for 4T=4R, 't8r8' for 8T8R) depending on the indicated UE antenna switching capability for 8Tx SRS.

[0267] According to this embodiment, a UE supporting 8Tx SRS transmission can use appropriate settings for antenna switching SRS.

[0268] <Embodiment D2> This embodiment relates to reporting of supported (downgraded) settings.

[0269] In a UE supporting 8Tx SRS transmission for antenna switching, reporting of one or more supported downgrade configurations may follow at least one of the following approaches.

[0270] - Approach 2-1: Reuse / repurpose of Rel. 16 UE capability reporting (e.g., feature group (FG) 14-4). FG 14-4 is the SRS Tx switch functionality that allows downgrade configuration. A component of that FG is support for SRS Tx port switch. The prerequisite FG for that FG is FG2-55 (SRS Tx Switch). The field name of that FG is supportedSRS-TxPortSwitch-v1610. The parent IE of that FG is BandParameters-v1610. By designing Rel. 16 UE capabilities to be combined with existing Rel. 15 UE capabilities, the UE can indicate support for one of the following combinations: -- {t1r1, t1r2} -- {t1r1, t1r2, t1r4} -- {t1r1, t1r2, t2r2, t2r4} -- {t1r1, t2r2} -- {t1r1, t2r2, t4r4} --- {t1r1, t1r2, t2r2, t1r4, t2r4}

[0271] Approach 2-2: Reuse / repurpose of Rel. 17 UE capability reports (e.g., FG23-8-3). FG23-8-3 is the function of SRS antenna switching for more than four receivers. The components of this FG are: (1) support for SRS antenna switching xTyR with y>4, (2) reporting the first listed entry number with UL in the band combination that affects this DL, and (3) reporting the entry number of the first listed band with this UL in the band combination that switches with UL. The prerequisite FG for this FG is FG2-55 (SRS Tx Switch). The field name of the FG is srs-AntennaSwitchingBeyond4RX-r17{supportedSRS-TxPortSwitchBeyond4Rx-r17, entryNumberAffectBeyond4Rx-r17, entryNumberSwitchBeyond4Rx-r17}. The parent IE of the FG is BandParameters-v1710. The candidate values ​​for Component 1 are combinations from the set {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8}. The candidate values ​​for Component 2 are {1 to 32}. The candidate values ​​for Component 3 are {1 to 32}. Components 2 and 3 are optional. If Components 2 and 3 are reported, the reported values ​​for Components 2 and 3 are specified in Rel. 15 / 16 Invalid for the same value of xTyR in component 1 reported using UE capability reporting.

[0272] Approach 2-3: Adding components within Rel. 18 FG for 8Tx SRS antenna switching.

[0273] <<Options for Approach 2-1>> Option 1: The above-described Approach 2-1 may follow the rules of at least one of several options 1-x below.

[0274] -- Option 1-1: If the UE supports 8Tx SRS transmission for antenna switching and also supports downgrade configuration, the UE supports srs-TxSwitch-v1610 (FG14-4).

[0275] -- Option 1-2: If the UE supports 8Tx SRS transmission for antenna switching and also supports srs-TxSwitch-v1610 (FG14-4), the value reported in supportedSRS-TxPortSwitch-v1610 in srs-TxSwitch-v1610 shall be at least one of the following values ​​(combinations with the same number of ports for Tx and Rx): -- {t1r1, t2r2} -- {t1r1, t2r2, t4r4}

[0276] -- Option 1-3: If the UE supports 8Tx SRS transmission for antenna switching and also supports srs-TxSwitch (Rel.15 SRS antenna switching FG), the value reported in supportedSRS-TxPortSwitch in srs-TxSwitch shall be at least one of the following values ​​(combinations with the same number of ports for Tx and Rx): -- {t1r1} -- {t2r2} -- {t4r4}

[0277] <<Options for Approach 2-2>> Option 2: Approach 2-1 may follow the rules of at least one of several options 2-x below.

[0278] -- Option 2-1: If the UE supports 8Tx SRS transmission for antenna switching and also supports downgrade configuration, the UE supports srs-AntennaSwitchingBeyond4RX-r17 (FG23-8-3).

[0279] -- Option 2-2: If the UE supports 8Tx SRS transmission for antenna switching and also supports srs-AntennaSwitchingBeyond4RX-r17 (FG23-8-3), the value reported in supportedSRS-TxPortSwitchBeyond4Rx-r17 in srs-AntennaSwitchingBeyond4RX-r17 shall be at least one of the following values ​​(combinations with the same number of ports for Tx and Rx): -- {t1r1} -- {t2r2} -- {t4r4}

[0280] -- Option 2-3: If the UE supports 8Tx SRS transmission for antenna switching and also supports srs-TxSwitch (Rel.15 SRS antenna switching FG), the value reported in supportedSRS-TxPortSwitch in srs-TxSwitch shall be at least one of the following values ​​(combinations with the same number of ports for Tx and Rx): -- {t1r1} -- {t2r2} -- {t4r4}

[0281] <<Options for Approach 2-3>> A component may be added within the Rel. 18 FG for 8Tx SRS antenna switching. The component may follow at least one of the following options 3 to 5.

[0282] - Option 3: The format of the component may be at least one of the following options 3-x: -- Option 3-1: Bitmap. It may have one bit for each setting. Bit 0 may mean that the corresponding setting is not supported, and bit 1 may mean that the corresponding setting is supported. For example, a 4-bit bitmap may be reported. The 4 bits may correspond to {t1r1, t2r2, t4r4, t8r8}, respectively. -- Option 3-2: Index. Multiple candidate subsets of settings and their corresponding indices are defined. As in the example of Figure 21, indexes 0, 1, 2, and 3 may be associated with the supported subsets of settings {t8r8}, {t8r8, t4r4}, {t8r8, t4r4, t2r2}, and {t8r8, t4r4, t2r2, t1r1}, respectively.

[0283] - Option 4: The other component may be at least one of the following options 4-x: -- Option 4-1: The entry number of the first listed band with UL in the band combination that affects this DL. -- Option 4-2: The entry number of the first listed band with this UL in the band combination that switches with UL.

[0284] - Option 5: In 8Tx SRS transmission for antenna switching, reporting of one or more supported downgrade settings (new FG) may follow at least one of the following several options 5-x: -- Option 5-1: When a new FG is reported, FGs corresponding to SRS antenna switching in the previous release (existing FGs, e.g., srs-TxSwitch, srs-TxSwitch-v1610, srs-AntennaSwitchingBeyond4RX-r17) are ignored (disabled). -- Option 5-2: When a new FG reports a tXrY setting and that tXrY setting is also reported by an FG corresponding to SRS antenna switching in the previous release (existing FGs, e.g., srs-TxSwitch, srs-TxSwitch-v1610, srs-AntennaSwitchingBeyond4RX-r17), the component of option 4-1 reported in the new FG is disabled. That is, the "entry number of the first listed band with UL in the band combination that affects this DL" in the new FG may be invalid. -- Option 5-3: If a new FG reports a tXrY setting and that tXrY setting is also reported by an FG corresponding to SRS antenna switching in a previous release (existing FG, e.g., srs-TxSwitch, srs-TxSwitch-v1610, srs-AntennaSwitchingBeyond4RX-r17), the component of Option 4-2 reported in the new FG is invalid. That is, the "entry number of the first listed band with this UL in the band combination that switches with UL" in the new FG may be invalid.

[0285] The UE capability FG for Approach 2-3 may comply with at least one of the following contents: - The FG indicates support for SRS using 8 non-TDM Tx ports for antenna switching. - The FG indicates support for SRS using 8 Tx ports for antenna switching. The FG includes at least one of the following components: -- Component 1: Supported xTyR configuration combinations from {t1r1, t2r2, t4r4, t8r8}. -- Component 2: Entry number of the first listed band with UL in the band combination that affects this DL. -- Component 3: Entry number of the first listed band with this UL in the band combination that switches with UL. The FG may be reported per band, per band combination (BC), per feature set (FS), per feature set per CC (Feature Set Per Component-carrier, FSPC), or per band and per BC.

[0286] According to this embodiment, a UE that supports 8Tx SRS transmission can properly report its antenna switching SRS capability.

[0287] <Supplementary Information> [Notification of Information to UE] In the above-described embodiments, any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, reception of any information from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0288] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0289] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0290] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0291] [Notification of Information from UE] In the above-described embodiments, notification of any information from the UE (to the NW) (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0292] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0293] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0294] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0295] [Application of Each Embodiment] At least one of the above-described embodiments may be applied when a specific condition is met. The specific condition may be defined in a standard or may be notified to a UE / BS using higher layer signaling / physical layer signaling. The specific condition may indicate at least one of the following: - At least one of the above-described embodiments is enabled.

[0296] At least one of the above-described embodiments may be applied to only any of the following SRS: - SRS using more than four ports; - SRS using more than four ports that are TDMed; - SRS using more than four ports that are not TDMed; - SRS with specific time domain operations (e.g., AP / SP / P); - SRS with specific applications (e.g., CB / NCB / antenna switching / beam management).

[0297] At least one of the above-described embodiments may be applied only to UEs that have reported or support a specific UE capability. Note that "supporting" and "whether to support" may be interpreted as interchangeable.

[0298] The specific UE capabilities may indicate at least one of the following: Supporting specific processing / operation / control / information for at least one of the above embodiments; Supporting constraints on R; Supporting determination of the number of port subsets (as in embodiment B2); Supporting constraints on the number of SRS resource sets for 8-port SRS (TDM / non-TDM); Maximum number of SRS resource sets / SRS resources supported in one slot / symbol.

[0299] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0300] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0301] Furthermore, at least one of the above-described embodiments may be applied when a UE configures / activates / triggers specific information related to the above-described embodiments (or performs the operations of the above-described embodiments) through higher layer signaling / physical layer signaling. The specific information may indicate at least one of the following: - Information indicating enabling / disabling the operations of the above-described embodiments. - RRC parameters for a specific release (e.g., Rel. 18 / 19). In Rel. YY (e.g., YY is 18 or greater), the RRC parameters enabling operation XXX may be represented as XXX_rYY (XXX-rYY).

[0302] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, the behavior of Rel. 15 / 16 / 17.

[0303] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives a configuration of a sounding reference signal (SRS) resource set for antenna switching; and a controller that controls, based on the configuration, transmission of the SRS using antennas that are fewer than a total number of antennas and more than four transmit ports. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller controls reporting of capability information that indicates one or more supported SRS transmit port switching patterns. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the transmission is based on an SRS transmit port switching pattern, and a combination (x, y) of the number of transmit ports and the number of receive ports in the SRS transmit port switching pattern is any of (1,1), (2,2), (1,2), (4,4), (2,4), (1,4), (2,6), (1,6), (4,8), (2,8), (1,8), (8,8), and (4,6). [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the transmission is based on an SRS transmission port switching pattern, and in the SRS transmission port switching pattern, the number of transmission ports is equal to the number of reception ports.

[0304] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0305] 22 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0306] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0307] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0308] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0309] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0310] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0311] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0312] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0313] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0314] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0315] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0316] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0317] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0318] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0319] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0320] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0321] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0322] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0323] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0324] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0325] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0326] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0327] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0328] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0329] 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 an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0330] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0331] 23 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0332] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0333] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0334] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0335] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0336] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0337] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0338] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0339] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0340] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0341] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0342] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0343] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0344] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0345] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0346] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0347] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0348] The transceiver 120 may transmit a configuration of a sounding reference signal (SRS) resource set for antenna switching. The controller 110 may control transmission of the SRS using fewer antennas than the total number of antennas of the terminal and more than four transmission ports based on the configuration.

[0349] (User terminal) Fig. 24 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0350] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0351] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0352] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0353] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0354] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0355] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0356] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0357] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0358] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0359] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0360] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0361] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0362] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0363] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0364] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0365] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0366] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0367] The transceiver 220 may receive a configuration of a sounding reference signal (SRS) resource set for antenna switching, and the controller 210 may control SRS transmission using fewer antennas than the total number of antennas and more than four transmit ports based on the configuration.

[0368] The controller 210 may control reporting of capability information indicating one or more supported SRS transmission port switching patterns.

[0369] The transmission may be based on an SRS transmission port switching pattern, in which a combination (x, y) of the number of transmission ports and the number of reception ports in the SRS transmission port switching pattern may be any of (1,1), (2,2), (1,2), (4,4), (2,4), (1,4), (2,6), (1,6), (4,8), (2,8), (1,8), (8,8), and (4,6).

[0370] The transmission may be based on an SRS transmit port switching pattern, in which the number of transmit ports may be equal to the number of receive ports.

[0371] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0372] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0373] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 25 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0374] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0375] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0376] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0377] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0378] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0379] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0380] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0381] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0382] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0383] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0384] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0385] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0386] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0387] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0388] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0389] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0390] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0391] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0392] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0393] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0394] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0395] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0396] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0397] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0398] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0399] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0400] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0401] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0402] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0403] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0404] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0405] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0406] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0407] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0408] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0409] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0410] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0411] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0412] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0413] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0414] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0415] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0416] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0417] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0418] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0419] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0420] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0421] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0422] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0423] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0424] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0425] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0426] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0427] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0428] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0429] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0430] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0431] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0432] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0433] 26 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0434] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0435] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0436] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0437] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0438] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0439] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0440] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0441] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0442] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0443] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0444] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0445] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0446] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0447] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0448] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0449] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0450] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0451] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0452] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0453] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0454] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0455] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0456] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...." "does not expect ..." may be interchangeably read as "be not expected ...." Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0457] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0458] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0459] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0460] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0461] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0462] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0463] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0464] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0465] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0466] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0467] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A terminal having a receiving unit that receives a configuration of a sounding reference signal (SRS) resource set for antenna switching; and a control unit that controls transmission of the SRS using antennas fewer than the total number of antennas and more than four transmission ports based on the configuration.

2. The terminal of claim 1, wherein the control unit controls reporting of capability information indicating one or more supported SRS transmission port switching patterns.

3. The terminal of claim 1, wherein the transmission is based on an SRS transmission port switching pattern, and a combination (x, y) of the number of transmission ports and the number of reception ports in the SRS transmission port switching pattern is any of (1,1), (2,2), (1,2), (4,4), (2,4), (1,4), (2,6), (1,6), (4,8), (2,8), (1,8), (8,8), and (4,6).

4. The terminal according to claim 1, wherein the transmission is based on an SRS transmission port switching pattern, and in the SRS transmission port switching pattern, a number of transmission ports is equal to a number of reception ports.

5. A wireless communication method for a terminal, comprising: a step of receiving a configuration of a sounding reference signal (SRS) resource set for antenna switching; and a step of controlling transmission of the SRS using antennas fewer than the total number of antennas and more than four transmission ports based on the configuration.

6. A base station having a transmitting unit that transmits a configuration of a sounding reference signal (SRS) resource set for antenna switching, and a control unit that controls reception of the SRS transmitted using antennas fewer than the total number of antennas of a terminal and more than four transmitting ports based on the configuration.

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