Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure has: a transmission unit that transmits one or more capability information elements indicating the support of a first setting that uses y number of antennas and x number of antenna ports for a Sounding Reference Signal (SRS) transmission, and the support of a second setting that uses some of the y number of antennas and x number of antenna ports for the SRS transmission; and a control unit that controls the SRS transmission on the basis of settings dependent on the capability information, y being 6 or more and x being y or less. According to the one embodiment of the present disclosure, it is possible to appropriately report SRS-related capabilities.

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. 、 base station and systems Regarding. [Background technology]

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) 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) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In wireless communication systems, the use of sounding reference signals (SRS) is diverse. For example, NR SRS is used not only for uplink (UL) CSI measurement but also for downlink (DL) CSI measurement and beam management.

[0006] Furthermore, consideration is being given to using more antennas in terminals.

[0007] However, there has been little progress in investigating how to report the capabilities of terminals that use more antennas. If the reporting method is unclear, there is a risk that communication throughput / communication quality will deteriorate.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method that appropriately report SRS-related capabilities. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes: 6 or more Antenna against Sounding Reference Signal (SRS) Antenna Switching Supporting and show single of UE ability News a transmitting unit for transmitting the UE Based on configuration dependent on capability information 、S a control unit for controlling RS transmission; The UE capability information indicates support for only a subset of downgrade configurations available due to the antenna configuration implemented in the UE. . [Effects of the Invention]

[0010] According to one aspect of the present disclosure, capabilities related to an SRS can be appropriately reported. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 shows an example of an existing SRS antenna switching configuration. [Figure 2] FIG. 2 shows an example of SRS antenna switching settings according to variation #0. [Figure 3] FIG. 3 shows an example of SRS antenna switching settings according to variation #2. [Figure 4] FIG. 4 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 5] FIG. 5 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (SRS) In NR, the sounding reference signal (SRS) has a wide range of uses. NR SRS is used not only for uplink (UL) CSI measurement, which was also used in existing LTE (LTE Rel. 8-14), but also for downlink (DL) CSI measurement and beam management.

[0013] A UE may be configured with one or more SRS resources, which may be identified by an SRS Resource Index (SRI).

[0014] Each SRS resource may have one or more SRS ports (corresponding to one or more SRS ports). For example, the number of ports per SRS may be 1, 2, 4, etc.

[0015] 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.

[0016] Information about the SRS resource or resource set may be configured in the UE using higher layer signaling, physical layer signaling, or a combination thereof.

[0017] The SRS configuration information element (for example, the RRC information element "SRS-Config") may include an SRS resource set configuration information element, an SRS resource configuration information element, and the like.

[0018] 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 (usage).

[0019] Here, the SRS resource type may indicate the time domain behavior of SRS resource configuration, and may indicate any of Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), and Aperiodic SRS (A-SRS). Note that the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation). The UE may transmit A-SRS based on an SRS request in the DCI.

[0020] 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, an 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.

[0021] The beam management SRS may be assumed to allow only one SRS resource for each SRS resource set to be transmitted at a given time instant. However, if multiple SRS resources with the same time domain behavior in the same Bandwidth Part (BWP) belong to different SRS resource sets, these SRS resources may be transmitted simultaneously.

[0022] The SRS resource configuration information element (e.g., the RRC parameter "SRS-Resource") may include an SRS resource ID (SRS-ResourceId), an SRS port number, an SRS port number, a transmission comb number, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, repetition number, SRS symbol number, SRS bandwidth, etc.), hopping-related information, an SRS resource type, a sequence ID, spatial relationship information, etc.

[0023] The value of the number of transmission combs (transmissionComb) is {2, 4}. The number of antenna 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 in the 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

[0024] The setting of the number of combs to be transmitted may include a comb offset and a cyclic shift (CS index, CS number).

[0025] comb offset (subcarrier offset) = {0,1,...K TC SRSs from UEs with at least one different SRS and CS may be multiplexed using the same number of transmission combs, the same RBs, and the same symbols.

[0026] 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.

[0027] 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

[0028] where k - denotes the variable k with an overline, which may also be called k-bar. - 0 p_i may be based on comb offsets. 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.

[0029] (UE sounding / antenna switching for DL ​​CSI acquisition) When 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 does not assume that different spatial relationships are configured for multiple SRS resources within the same SRS resource set.

[0030] 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 to 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).

[0031] The UE capability information for SRS transmission switch (srs-TxSwitch) indicates whether the UE supports SRS for DL ​​CSI acquisition (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 transmit (Tx) port switching pattern supported by the UE. The SRS transmit port switching pattern is a mandatory function that involves capability signaling.

[0032] 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.

[0033] The UE antenna switching capability, indicated 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.

[0034] [Setting 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.

[0035] [Setting 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, each SRS resource set having two SRS resources transmitted in different symbols, each SRS resource in a given set consisting of two SRS ports, where 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.

[0036] [Setting 3] For 1T4R, zero or one SRS resource set with four SRS resources transmitted in different symbols, with the resource type (higher layer parameter resourceType) within the SRS resource set set to periodic or semi-persistent. Each SRS resource in a given set consists of a single SRS port, and the SRS port of each resource is associated with a different UE antenna port.

[0037] [Setting 4] For 1T4R, zero or two SRS resource sets each have a total of four SRS resources transmitted in different symbols of two different slots, with the resource type within the SRS resource set (higher layer parameter resourceType) set to aperiodic. 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 sets (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.

[0038] [Setting 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.

[0039] 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).

[0040] 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.

[0041] If the indicated UE capability is 1T4R / 2T4R, the UE assumes that the same SRS port number of 1 or 2 is configured for all SRS resources in the SRS resource set.

[0042] 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.

[0043] The UE capability information for the SRS transmit switch (srs-TxSwitch-v1610) may include a parameter supportedSRS-TxPortSwitch-v1610. supportedSRS-TxPortSwitch-v1610 indicates a downgrading configuration of the SRS transmit port switching pattern, and its reporting is optional. When the UE indicates support for a downgrading configuration of the SRS transmit 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 what is reported in supportedSRS-TxPortSwitch: 't1r1-t1r2' 't1r1-t1r2-t1r4' 't1r1-t1r2-t2r2-t2r4' 't1r1-t2r2' 't1r1-t2r2-t4r4' 't1r1-t1r2-t2r2-t1r4-t2r4'

[0044] (analysis) The existing NR specifications support SRS switching for up to four antennas. In Rel. 17, support for SRS switching for up to eight antennas is being considered. For example, support for xTyR, x={1,2,4}, y={6,8} is being considered.

[0045] In Rel.17, the following SRS antenna switching configurations are supported: K may be the total number of SRS resources. N may be the number of SRS resource sets. N_max may be the maximum number of SRS resource sets. For 1T6R, K=6, N_max=3 (N=1,2,3), each SRS resource may have 1 port. For 1T8R, K=8, N_max=4 (N=2,3,4), each SRS resource may have 1 port. For 2T6R, K=3, N_max=3 (N=1,2,3), each SRS resource may have 2 ports. For 2T8R, K=4, N_max=4 (N=1,2,3,4), each SRS resource may have 2 ports. For 4T8R, K=2, N_max=2 (N=1,2), each SRS resource may have 4 ports.

[0046] A Rel. 15 UE can only support the SRS antenna switching configuration of supportedSRS-TxPortSwitch in the SRS antenna switching configurations in Figure 1. That is, the UE only supports the SRS antenna switching configuration that uses all implemented receive (Rx) antennas for sounding for DL ​​CSI acquisition. In this disclosure, this configuration may be referred to as the mandatory configuration.

[0047] A Rel. 16 UE can support the supportedSRS-TxPortSwitch-v1610 pattern in addition to the supportedSRS-TxPortSwitch pattern among the SRS transmit port switching patterns (patterns) in Figure 1. 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.

[0048] Among the patterns in Figure 1, the following settings are mandatory settings. 't1r2' for 1T2R 't2r4' for 2T4R 't1r4' for 1T4R 't1r1' for 1T=1R 't2r2' for 2T=2R 't4r4' for 4T=4R

[0049] Among the patterns in Figure 1, 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

[0050] For example, if the UE reports 't1r1-t1r2', a 1T2R antenna is implemented, but the SRS antenna switching configuration can be configured using only 1T1R.

[0051] However, it is unclear how to extend the SRS antenna switching configuration / pattern. For example, when the number of Rxs (y) is 6 / 8, the following issues arise: whether downgrade configuration is supported and how mandatory / downgrade configuration is configured. For example, the following issues arise: whether reporting whether mandatory / downgrade configuration is supported should be defined as a single capability or multiple capability information. For example, if downgrade configuration is supported, the following issues arise: whether all possible patterns of downgrade configuration are supported, only some of the patterns are supported, or whether the supported patterns are variable.

[0052] If such SRS capability reporting / settings are not clear, there is a risk of communication throughput / communication quality deteriorating.

[0053] Therefore, the present inventors came up with the idea of ​​a method for reporting / setting the capabilities of an SRS.

[0054] Hereinafter, embodiments of 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.

[0055] 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."

[0056] In the present disclosure, terms such as 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.

[0057] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), configurations, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0058] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0059] 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.

[0060] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0061] In this disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In this disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0062] (Wireless communication method) In each embodiment, Rel. 17 SRS, new SRS, and new SRS antenna switching may be interchangeable.

[0063] In each embodiment, the terms "configuration," "SRS antenna switching setting," and "SRS transmit port switching pattern" may be interchangeable. In each embodiment, the terms "SRS transmit port switching pattern," "pattern," and "combination of one or more supported SRS antenna switching settings" may be interchangeable.

[0064] In each embodiment, the terms antenna configuration, antenna implementation, antenna architecture, and number of antennas may be interchangeable.

[0065] In each embodiment, the terms "antenna port," "transmitting antenna port," "antenna port used for SRS transmission," and "antenna port used for SRS antenna switching" may be interchangeable. In each embodiment, the terms "antenna," "receiving antenna," and "UE receiving antenna" may be interchangeable.

[0066] In each embodiment, x, the number of Tx, the number of antenna ports, the number of transmitting antenna ports, and the number of antenna ports used for SRS transmission may be interchangeable. In each embodiment, y, the number of Rx, the number of antennas, the number of receiving antennas, and the number of antennas used for SRS transmission may be interchangeable.

[0067] In each embodiment, a feature group (FG) and UE capability information for SRS transmission switching may be interchangeable.

[0068] First Embodiment This embodiment relates to UE capability reporting.

[0069] In the UE capability report for Rel.17 SRS, the UE capability for SRS antenna switching for DL ​​CSI acquisition may follow either of the following options 1 and 2.

[0070] [Option 1] A single feature group (FG) is defined, and the UE reports the single FG. This single FG may be able to report support for at least one of mandatory and downgrade configurations. This single FG may be an SRS Tx switch. This single FG may include supported SRS Tx switching patterns (supportedSRS-TxPortSwitch), whether the UL transmission switching affects in-band DL reception (bands on which the UL transmission impacts DL, txSwitchImpactToRx), and whether the UL transmission is switched with UL transmission in another band (bands on which all UL and DL switch together, txSwitchWithAnotherBand).

[0071] [Option 2] Multiple FGs are defined, and the UE reports the multiple FGs. The multiple FGs may include a first FG that reports support for mandatory configuration and a second FG that reports support for downgraded configuration. The first FG that reports support for mandatory configuration may be defined, and the first FG may be a pre-requisite FG for the second FG that reports support for downgraded configuration. In other words, reporting support for downgraded configuration (second FG) may require reporting support for mandatory configuration (first FG). The first FG may be an SRS Tx switch. The second FG may be an SRS Tx switch that allows downgraded configuration (SRS Tx switch with down grading configuration). The first FG may include supportedSRS-TxPortSwitch, txSwitchImpactToRx, and txSwitchWithAnotherBand. The second FG may include an SRS transmission switching pattern (supportedSRS-TxPortSwitch-x) of a supported downgrade setting, but may not include txSwitchImpactToRx and txSwitchWithAnotherBand.

[0072] According to this embodiment, the UE can properly report the UE capability regarding SRS antenna switching configuration.

[0073] <Second embodiment> This embodiment relates to UE capability reporting for downgrade configuration.

[0074] In the UE capability reporting for Rel.17 SRS, among the UE capabilities for SRS antenna switching for DL ​​CSI acquisition, the reporting of UE capabilities / patterns for downgrade settings may follow either option 1 or 2 below. [Option 1] The UE shall report support for all downgrade configurations achievable by the antenna configuration implemented in the UE collectively. [Option 2] The UE reports support for only a subset of the downgrade configurations that can be achieved with the antenna configuration implemented in the UE.

[0075] Here, the antenna configuration may be either of the following options 1 and 2. [Option 1] The antenna configuration may refer to the number of antennas (number of transmit antennas / number of receive antennas) based on x (number of Tx) / y (number of Rx) reported as a mandatory setting. [Option 2] The antenna configuration may refer to x(Tx number) / y(Rx number) based on the maximum x(Tx number) / y(Rx number) among the configurations reported as supported configurations.

[0076] Here, "downgrade configuration achievable by the antenna configuration implemented in the UE" may refer to an SRS antenna switching configuration (pattern) that uses x (number of Txs) / y (number of Rxs) equal to or less than x (number of Txs) / y (number of Rxs) in that antenna configuration.

[0077] According to this embodiment, the UE can properly report the UE capability regarding SRS antenna switching configuration.

[0078] <Third embodiment> This embodiment relates to a combination / variation of the first and second embodiments.

[0079] Variation #0 The UE may use only one FG for antenna switching and may report all or some of the following SRS antenna switching configurations: Supports mandatory settings only. Support mandatory settings, support and downgrade settings.

[0080] Possible values ​​for reported UE capabilities / patterns may include any of the following (Figure 2): Mandatory settings: 't1r6' for 1T6R 't2r6' for 2T6R 't1r8' for 1T8R 't2r8' for 2T8R Downgrade Settings: ·'t1r1-t1r2-t1r4-t1r6' for 1T=1R / 1T2R / 1T4R / 1T6R ·'t1r1-t1r2-t2r2-t1r4-t2r4-t1r6-t2r6' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T6R / 2T6R ·'t1r1-t1r2-t1r4-t1r6-t1r8' for 1T=1R / 1T2R / 1T4R / 1T6R / 1T8R ·'t1r1-t1r2-t2r2-t1r4-t2r4-t1r6-t2r6-t1r8-t2r8' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T6R / 2T6R / 1T8R / 2T8R ·'t1r1-t1r2-t2r2-t1r4-t2r4-t1r6-t2r6t1r8-t2r8-t4r8' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T6R / 2T6R1T8R / 2T8R / 4T8R

[0081] Variation 1 The UE may use only one FG for antenna switching and may report at least one of the following SRS antenna switching configurations: · One or more SRS antenna switching settings (patterns). One or more SRS antenna switching settings (patterns) freely selected from mandatory settings and downgrade settings, for example, one or more SRS antenna switching settings from {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8}. A combination (pattern) of one or more mandatory settings and x downgrade settings related to those mandatory settings. For example, a combination such as {t2r6,t1r8} will not be reported.

[0082] Variation 2 In variation #0, an SRS antenna switching setting may be added.

[0083] The UE may use only one FG for antenna switching and may report all or some of the following SRS antenna switching configurations: Supports mandatory settings only. Supported mandatory settings and supported downgrade settings. If the SRS antenna switching setting of y=8(8R) is supported, the SRS antenna switching setting of y=6(6R) must be supported, or if the SRS antenna switching setting of y=8(8R) is supported, the SRS antenna switching setting of y=6(6R) must not be supported.

[0084] Possible values ​​for reported UE capabilities / patterns may include any of the following (Figure 3): Mandatory settings: 't1r6' for 1T6R 't2r6' for 2T6R 't1r8' for 1T8R 't2r8' for 2T8R Downgrade Settings: ·'t1r1-t1r2-t1r4-t1r6' for 1T=1R / 1T2R / 1T4R / 1T6R ·'t1r1-t1r2-t2r2-t1r4-t2r4-t1r6-t2r6' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T6R / 2T6R ·'t1r1-t1r2-t1r4-t1r6-t1r8' for 1T=1R / 1T2R / 1T4R / 1T6R / 1T8R ·'t1r1-t1r2-t2r2-t1r4-t2r4-t1r6-t2r6-t1r8-t2r8' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T6R / 2T6R / 1T8R / 2T8R ·'t1r1-t1r2-t2r2-t1r4-t2r4-t1r6-t2r6t1r8-t2r8-t4r8' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T6R / 2T6R1T8R / 2T8R / 4T8R ·'t1r1-t1r2-t2r2-t1r4-t2r4-t1r8-t2r8' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T8R / 2T8R 't1r1-t1r2-t2r2-t1r4-t2r4-t1r8-t2r8-t4r8' for 1T=1R / 1T2R / 2T=2R / 1T4R / 2T4R / 1T8R / 2T8R / 4T8R

[0085] Variation 3 The UE may report a first FG for antenna switching and a second FG for reporting support for downgrade configuration.

[0086] The first FG may report the antenna implementation / antenna configuration. For example, the candidate values ​​of the UE capability / pattern indicating the antenna implementation may include any of the following: 't1r6' for 1T6R 't2r6' for 2T6R 't1r8' for 1T8R 't2r8' for 2T8R

[0087] The second FG may include supported downgrade settings based on antenna implementation / antenna configuration. If the downgrade settings based on the antenna implementation are not supported, the second FG may not be reported. For example, candidate values ​​of UE capabilities / patterns corresponding to the second FG may include at least one of {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8}. The Tx / Rx values ​​of the SRS antenna switching settings reported in the second FG may be smaller than the Tx / Rx values ​​of the SRS antenna switching settings reported in the first FG.

[0088] According to this embodiment, the UE can properly report the UE capability regarding SRS antenna switching configuration.

[0089] <Other embodiments> 《UE capability information / upper layer parameters》 Higher layer parameters (RRC IEs) / UE capabilities corresponding to the functions (features) in each of the above embodiments may be defined. The higher layer parameters may indicate whether the functions are enabled. The UE capabilities may indicate whether the UE supports the functions.

[0090] A UE for which a corresponding upper layer parameter is configured may perform the function. Alternatively, it may be specified that a UE for which a corresponding upper layer parameter is not configured shall not perform the function (for example, in accordance with Rel. 15 / 16).

[0091] A UE that reports / transmits a UE capability indicating that it supports the function may perform the function. It may also be specified that "a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0092] If the UE reports / transmits a UE capability indicating that it supports the function and the corresponding upper layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report / transmit a UE capability indicating that it supports the function or if the corresponding upper layer parameter is not configured, the UE shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0093] Which embodiment / option / variation / choice / function is used among the above multiple embodiments may be configured by higher layer parameters, may be reported by the UE as a UE capability, may be specified in a specification, or may be determined by the reported UE capability and the configuration of higher layer parameters.

[0094] The UE capability / higher layer parameters may indicate the UE capability functions of each embodiment.

[0095] The above UE capabilities / upper layer parameters allow the UE to achieve the above functions while maintaining compatibility with existing specifications.

[0096] (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.

[0097] 4 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication 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).

[0098] 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.

[0099] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the 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.

[0100] 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 the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0101] 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.

[0102] 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 (CC) and dual connectivity (DC).

[0103] 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 above 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 be a frequency band higher than FR2.

[0104] 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.

[0105] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, 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.

[0106] 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.

[0107] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0108] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio 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).

[0109] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0110] 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.

[0111] 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)), etc. may be used as an uplink channel.

[0112] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0113] 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.

[0114] 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 an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0115] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search 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 a CORESET associated with a certain search space based on the search space configuration.

[0116] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0117] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement 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.

[0118] 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.

[0119] 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, 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 as DL-RS.

[0120] 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 the SS (PSS, SSS) and the PBCH (and 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 reference signals.

[0121] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. 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).

[0122] (base station) 5 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.

[0123] 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.

[0124] 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.

[0125] 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 to be transmitted as signals, control information, sequences, etc., 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.

[0126] 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.

[0127] The transmitting / receiving unit 120 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 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0128] 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 pertains, such as an array antenna.

[0129] 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.

[0130] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0131] The transceiver 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.

[0132] The transceiver 120 (transmission processor 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.

[0133] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0134] 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 .

[0135] 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.

[0136] 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.

[0137] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0138] 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.

[0139] The transceiver 120 may receive one or more capability information elements indicating that the terminal supports a first configuration in which y antennas and x antenna ports are used for sounding reference signal (SRS) transmission, and that the terminal supports a second configuration in which some of the y antennas and x antenna ports are used for the SRS transmission. The controller 110 may control the SRS transmission based on the configuration depending on the capability information. y may be 6 or greater, and x may be less than or equal to y.

[0140] (user terminal) 6 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.

[0141] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, 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.

[0142] 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, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0143] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also 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.

[0144] 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 from 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.

[0145] 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.

[0146] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0147] 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.

[0148] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0149] The transceiver 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.

[0150] The transceiver 220 (transmission processor 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.

[0151] 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 when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0152] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0153] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0154] The transceiver 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 to acquire user data, etc.

[0155] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, 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.

[0156] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0157] The transceiver 220 may transmit one or more capability information elements indicating that it supports a first configuration using y antennas and x antenna ports for sounding reference signal (SRS) transmission and that it supports a second configuration using some of the y antennas and x antenna ports for the SRS transmission. The controller 210 may control the SRS transmission based on the configuration depending on the capability information. y may be 6 or greater, and x may be less than or equal to y.

[0158] The one or more capability information elements may correspond to one functional group and indicate that the first setting and the second setting are supported.

[0159] The one or more capability information elements may include a first capability information element corresponding to a first functional group and indicating support for the first setting, and a second capability information element corresponding to a second functional group and indicating support for the second setting.

[0160] The one or more capability information elements may indicate support for all or some of a plurality of second configurations usable by the y antennas.

[0161] (Hardware configuration) 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 also be realized by combining the single device or multiple devices with software.

[0162] 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 mentioned above, the implementation method of each is not particularly limited.

[0163] 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. Fig. 7 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.

[0164] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read 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.

[0165] 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.

[0166] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined 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.

[0167] 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), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0168] 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 realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0169] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0170] Storage 1003 is a computer-readable recording medium and may be constituted by 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, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0171] 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.

[0172] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0173] 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.

[0174] 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 such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0175] (Variation) Note that terms explained 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.

[0176] 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.

[0177] 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, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0178] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0179] 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.

[0180] 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.

[0181] 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 a subframe and a 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.

[0182] 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. However, the definition of TTI is not limited to this.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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 equal to or greater than 1 ms.

[0187] 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 also be determined based on numerology.

[0188] 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. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0189] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0190] 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.

[0191] A Bandwidth Part (BWP), which may also be referred to as a fractional 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 given BWP and numbered within that BWP.

[0192] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0193] 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."

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, 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.

[0201] Note that the physical layer signaling may be called 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 called 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).

[0202] 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).

[0203] 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).

[0204] 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.

[0205] 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), then these wired and / or wireless technologies are included within the definition of transmission media.

[0206] 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).

[0207] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0208] In this 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.

[0209] 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 divided 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 term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0210] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 8 is a diagram showing an example of a vehicle according to an embodiment. 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.

[0216] 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 the user.

[0217] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., 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).

[0218] 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.

[0219] 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 (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0220] 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.

[0221] The driving assistance system unit 64 is configured with various devices that provide functions for preventing accidents and reducing 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.

[0222] 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.

[0223] 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 above-mentioned base station 10 or user terminal 20. Furthermore, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (or may function as at least one of the base station 10 and user terminal 20).

[0224] 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.

[0225] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices 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)).

[0226] 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.

[0227] 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 uplink channel and downlink channel may be read as sidelink channel.

[0228] 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.

[0229] 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) and a Serving-Gateway (S-GW)), or a combination thereof.

[0230] 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 specific order presented.

[0231] 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 The present invention may be applied to systems that use 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0232] 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."

[0233] 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.

[0234] 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.

[0235] 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.

[0236] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0237] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0238] 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.

[0239] 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."

[0240] 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.

[0241] 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."

[0242] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0243] 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.

[0244] 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 invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A transmitter that transmits a single UE capability information indicating that the UE supports sounding reference signal (SRS) antenna switching for six or more antennas; a control unit that controls SRS transmission based on a setting that depends on the UE capability information; A terminal, wherein the UE capability information indicates support for only a portion of downgrade settings available due to an antenna configuration implemented in the UE.

2. The terminal of claim 1 , wherein the UE capability information includes one or more SRS antenna switching patterns selected from a mandatory configuration and the downgrade configuration.

3. The terminal of claim 1 , wherein the UE capability information includes one or more SRS antenna switching patterns among t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, and t1r8.

4. transmitting a single UE capability information indicating support for sounding reference signal (SRS) antenna switching for six or more antennas; and controlling SRS transmission based on a configuration dependent on the UE capability information; The UE capability information indicates support for only a portion of downgrade configurations available due to an antenna configuration implemented in the UE.

5. a receiver for receiving a single UE capability information indicating that the terminal supports sounding reference signal (SRS) antenna switching for six or more antennas; A control unit that performs settings related to SRS transmission based on the UE capability information, A base station, wherein the UE capability information indicates support for only a portion of downgrade configurations available due to an antenna configuration implemented in the UE.

6. A system having a terminal and a base station, a transmitter for transmitting single UE capability information indicating that the terminal supports sounding reference signal (SRS) antenna switching for six or more antennas; a control unit that controls SRS transmission based on a setting that depends on the UE capability information; The base station includes a receiving unit for receiving the UE capability information; a control unit that performs the setting regarding the SRS transmission based on the UE capability information, The system, wherein the UE capability information indicates support for only a portion of downgrade configurations available due to an antenna configuration implemented in the UE.

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