Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure is characterized by comprising: a reception unit that receives a setting indicating whether a transformation precoder for a physical downlink shared channel (PUSCH) is disabled or enabled is dynamically switched by use of at least one of downlink control information (DCI) and medium access control control element (MAC CE); and a control unit that uses, as a period from the reception of the DCI to the transmission of the PUSCH, a second period longer than a first period of the case where the waveforms are not switched. According to an aspect of the present disclosure, the switching of waveforms can be easily implemented.

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 (e.g., NR), in addition to the single-carrier waveform Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM), support for the multi-carrier waveform Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) is being considered.

[0006] However, since the waveform configuration was previously performed by Radio Resource Control (RRC), switching the waveform required reconfiguration of the RRC, which increases signaling overhead and may reduce communication throughput.

[0007] Therefore, the present disclosure provides a terminal and a wireless communication method that can easily switch waveforms. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0008] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives a Radio Resource Control (RRC) parameter indicating that a transform precoder for a physical uplink shared channel (PUSCH) is to be dynamically switched between disabled and enabled by downlink control information (DCI); and a control unit that determines whether to disable or enable the transform precoder for the PUSCH based on an instruction included in the DCI. The size of each field in the DCI is the larger of the size when the transform precoder is disabled and the size when the transform precoder is enabled. . [Effects of the Invention]

[0009] According to one aspect of the present disclosure, waveform switching can be easily performed. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing the DCI size of option 1-1. [Figure 2] FIG. 2 is a diagram showing the DCI size of Option 1-2. [Figure 3] FIG. 3 is a diagram showing PUSCH power control information elements in 3GPP Rel. 16. [Figure 4] FIG. 4 is a diagram showing a first example of an MCS table in 3GPP Rel.16. [Figure 5] FIG. 5 is a diagram showing a second example of an MCS table in 3GPP Rel.16. [Figure 6] FIG. 6 is a diagram showing the "precoding information and number of layers" table in 3GPP Rel. 16 when the transform precoder is disabled. [Figure 7] FIG. 7 is a diagram showing the "precoding information and number of layers" table in 3GPP Rel. 16 when the transform precoder is enabled. [Figure 8] FIG. 8 is a diagram showing the "precoding information and number of layers" table when dynamic waveform switching is set. [Figure 9] FIG. 9 is a table corresponding to the antenna port field when the transform precoder is disabled in Rel. 16. [Figure 10] FIG. 10 is a table corresponding to the antenna port field when the transform precoder is enabled in 3GPP Rel. 16. [Figure 11] FIG. 11 is a diagram illustrating a PUSCH resource configuration when the PUSCH and the DMRS are frequency-multiplexed. [Figure 12]FIG. 12 is a diagram illustrating a PUSCH resource configuration when the PUSCH and the DMRS are not frequency-division multiplexed. [Figure 13] Fig. 13A is a diagram showing an example of setting the minimum value of K2 for each SCS, and Fig. 13B is a diagram showing an example of the existing minimum K2 value and the new minimum K2_X value. [Figure 14] Fig. 14A is a diagram showing an example of setting an additional value for K2 for each SCS, and Fig. 14B is a diagram showing an example of an additional value for TDRA. [Figure 15] FIG. 15 is a diagram showing an example of a TimeDomainAllocationList including additional values. [Figure 16] FIG. 16 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 17] FIG. 17 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 18] FIG. 18 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 19] FIG. 19 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (PUSCH transmission power control) In NR, the transmission power of the PUSCH is controlled based on a TPC command (also referred to as a value, an increase / decrease value, a correction value, etc.) indicated by a value in a predetermined field (also referred to as a TPC command field, etc.) in DCI.

[0012] For example, when a UE transmits a PUSCH on an active UL BWP b of a carrier f of a serving cell c using a parameter set (open loop parameter set) with index j and a power control adjustment state index l, the transmit power (PPUSCH、b,f,c (i,j,q d , l)) may be expressed by the following formula (1):

[0013] Here, the power control adjustment state may be configured to have multiple states (e.g., two states) or a single state depending on a higher layer parameter. Also, when multiple power control adjustment states are configured, one of the multiple power control adjustment states may be identified by an index l (e.g., l∈{0,1}). The power control adjustment state may also be called a PUSCH power control adjustment state, a first or second state, etc.

[0014] Furthermore, the PUSCH transmission opportunity i is a predetermined period during which the PUSCH is transmitted, and may be configured, for example, by one or more symbols, one or more slots, or the like.

[0015]

number

[0016] In equation (1), P CMAX,f,c(i) is, for example, the transmission power of the user equipment (also referred to as maximum transmission power, UE maximum output power, etc.) set for carrier f of serving cell c at transmission opportunity i. O_PUSCH,b,f,c (j) is, for example, a parameter related to the target received power (e.g., a parameter related to the transmit power offset, also referred to as the transmit power offset P0, target received power parameter, etc.) set for the active UL BWP b of the carrier f of the serving cell c at the transmission opportunity i.

[0017] M PUSCH RB,b,f,c (i) is the number of resource blocks (bandwidth) allocated to PUSCH for transmission opportunity i in active UL BWP b of carrier f with serving cell c and subcarrier spacing μ. b,f,c(j) is a value provided by a higher layer parameter (e.g., also called msg3-Alpha, p0-PUSCH-Alpha, fractional factor, etc.).

[0018] PL b,f,c (q d ) is, for example, the index q of the reference signal (path loss reference RS, DL RS for path loss measurement, PUSCH-PathlossReferenceRS) for downlink BWP associated with the active UL BWP b of carrier f of serving cell c. d is the path loss (path loss compensation) calculated by the user terminal using

[0019] Δ TF,b,f,c (i) is the transmission power adjustment component (offset, transmission format compensation) for UL BWP b of carrier f of serving cell c.

[0020] f b,f,c (i, l) is the TPC command-based value (e.g., power control adjustment state, accumulated value of TPC commands, closed-loop value) of the power control adjustment state index l of the active UL BWP of carrier f for serving cell c and transmission opportunity i.

[0021] In equation (1), the parameters related to open-loop control are M PUSCH RB,b,f,c (i), P O_PUSCH,b,f,c (j), α b,f,c (j), P.L. b,f,c (q d ) The parameters related to closed loop control are f b,f,c (i, l). That is, the transmission power of the PUSCH is determined by open-loop control and closed-loop control, with the maximum transmittable power of the UE as the upper limit.

[0022] (CP-OFDM and DFT-s-OFDM) In the uplink (UL) of a wireless communication system (e.g., NR), in addition to a multi-carrier waveform, the Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform, a single-carrier waveform, the Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform, is supported. In this disclosure, "waveform" refers to at least one of a CP-OFDM waveform (a waveform based on CP-OFDM) and a DFT-s-OFDM waveform (a waveform based on DFT-s-OFDM).

[0023] CP-OFDM allows for more flexible frequency resource allocation. For example, both contiguous and non-contiguous Physical Resource Block (PRB) allocation is permitted. Furthermore, contiguous PRB allocation is not limited to multiples of 2, 3, or 5. When CP-OFDM is applied, Frequency Division Multiplexing (FDM) may be used for the Demodulation Reference Signal (DMRS) and the PUSCH.

[0024] DFT-s-OFDM has significant constraints on frequency resource allocation, but has a low Peak to Average Power Ratio (PAPR), making it suitable for power-limited UEs.

[0025] In addition, when the communication throughput is measured without taking PAPR into consideration, CP-OFDM has a higher communication throughput than DFT-s-OFDM. When taking PAPP into consideration, when the SNR (MCS) is high (the modulation and coding method is 16QAM or 64QAM), the communication throughput of CP-OFDM is higher than that of DFT-s-OFDM, but when the SNR (MCS) is low (the modulation and coding method is QPSK), the communication throughput of DFT-s-OFDM is higher than that of CP-OFDM. In other words, the preferable waveform differs depending on the SNR (MCS).

[0026] Typically, the network (NW) switches waveforms based on the signal-to-noise ratio (SNR). Switching between DFT-s-OFDM and CP-OFDM is performed by the transform precoder "transformPrecoder" in the Physical Uplink Shared Channel (PUSCH) configuration (PUSCH-Config) of Radio Resource Control (RRC) signaling. When the transform precoder is disabled, CP-OFDM is applied, and when it is enabled, DFT-s-OFDM is applied. Waveform switching requires RRC reconfiguration, which increases signaling overhead and may reduce communication throughput.

[0027] For more flexible throughput control, it is possible to dynamically switch between CP-OFDM and DFT-s-OFDM using DCI / MAC CE. However, such dynamic switching has not yet been studied.

[0028] For example, in existing specifications (e.g., 3GPP Rel. 16), the sizes of some DCI fields in DCI formats (e.g., DCI formats 0_0 / 0_1 / 0_2) are affected by waveform switching, as shown in the following (1) to (6). (1) In the "Precoding information and number of layers" field, different tables are used for the two waveforms. (2) In the "Antenna ports" field, different tables are used for the two waveforms. (3) In the "DMRS sequence initialization" field, if the transform precoder is enabled, it is set to 0 bit, and if it is disabled, it is set to 1 bit. (4) In the "PTRS-DMRS association" field, the DCI size is affected by the transform precoder. (5) In "Frequency domain resource assignment," the DCI size varies depending on the resource assignment type. Also, the supported resource assignments vary depending on the waveform. CP-OFDM supports resource assignment types 0, 1, and 2, while DFT-s-OFDM supports resource assignment types 1 and 2. (6) In the "Frequency hopping flag" field, the DCI size varies depending on the resource allocation type. As mentioned above, different waveforms support different resource allocations.

[0029] Conventionally, waveform configuration was performed by RRC, allowing the UE to determine the DCI format size according to the waveform switching (based on the RRC configuration). However, if the DCI format size fluctuates when dynamically switching waveforms, it becomes difficult to control monitoring. Therefore, it is preferable that the size be constant regardless of the waveform. However, there has been little research into how the DCI should be configured and how the UE should determine the DCI size.

[0030] Therefore, the present inventors came up with the idea of ​​a terminal that dynamically switches between disabling and enabling (waveform switching) of a transform precoder for a PUSCH in an appropriate manner using DCI / MAC CE.

[0031] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0032] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, resource ID, and RI (resource index or rank index) may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0033] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0034] In the present disclosure, MAC CE and activation / deactivation command may be read interchangeably.

[0035] 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 (Master Information Block (MIB)), System Information Block (SIB), etc.), or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), and RRC messages may be interchangeable. Reporting in the present disclosure may be performed by higher layer signaling. In the present disclosure, "reporting," "measurement," and "transmission" may be interchangeable.

[0036] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The 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.

[0037] In the present disclosure, "A / B" may be interpreted as "at least one of A and B." The application / use of CP-OFDM and the disabling (disablement) of a transform precoder may be interpreted as mutually interchangeable. The application / use of DFT-s-OFDM and the enabling (enablement) of a transform precoder may be interpreted as mutually interchangeable. The disabling / enabling of a transform precoder, the switching of a transform precoder, and the switching of waveforms (CP-OFDM / DFT-s-OFDM) may be interpreted as mutually interchangeable. The waveform and the transform precoder may be interpreted as mutually interchangeable. The CP-OFDM and the CP-OFDM waveform may be interpreted as mutually interchangeable. The DFT-s-OFDM and the DFT-s-OFDM waveform may be interpreted as mutually interchangeable.

[0038] (Wireless communication method) The UE may receive a configuration indicating that the DCI / MAC CE dynamically switches between disabling and enabling the transform precoder for the PUSCH. Then, the UE may receive an instruction indicating the enabling or disabling of the transform precoder for the PUSCH via the DCI / MAC CE. Hereinafter, dynamic switching by the DCI / MAC CE may be simply referred to as dynamic switching. Note that the UE may be configured in advance by higher layer signaling or the like to dynamically switch (be able to switch) the waveform / transform precoder. Regardless of whether or not such a configuration is present, dynamic switching of the transform precoder by the DCI / MAC CE may be possible.

[0039] For example, DCI signaling-based dynamic waveform switching may be performed implicitly or explicitly. For example, a one-bit field indicating the CP-OFDM or DFT-s-OFDM waveform to be used for the PUSCH may be included in the DCI (explicit signaling). For example, the UE may determine / identify the CP-OFDM or DFT-s-OFDM waveform to be used for the PUSCH according to a specific condition, such as scheduling information, in the DCI (implicit signaling). In this case, the existing DCI format remains unchanged.

[0040] Alternatively, dynamic UL waveform switching based on MAC CE signaling may be performed. For example, a one-bit field indicating the CP-OFDM or DFT-s-OFDM waveform used for the PUSCH may be included in the MAC CE (explicit signaling). Alternatively, the UE may determine / identify the CP-OFDM or DFT-s-OFDM waveform used for the PUSCH based on an existing field in the MAC CE (implicit signaling).

[0041] The DCI format in the present disclosure may indicate, for example, DCI format 0_0 / 0_1 / 0_2, or may be another format (for example, DCI format 0_3 for notifying waveform switching). As another format, for example, a group-wide DCI such as DCI format 2_x may be used. In this case, waveform switching may be applied a certain time after the UE receives DCI format 2_x and transmits an ACK.

[0042] In the present disclosure, the switching between disabling and enabling of the transform precoder (switching of waveforms) may be switching of waveforms in the same BWP (switching of waveforms without switching BWPs). For example, since a different transform precoder can be set for each BWP, it is conceivable to switch the transform precoder by switching the BWP. However, since a delay occurs due to the BWP switching, the delay can be suppressed by switching between disabling and enabling the transform precoder in the same BWP.

[0043] First Embodiment When the DCI / MAC CE is configured to dynamically switch between disabling and enabling the transform precoder for the PUSCH, the UE may receive an instruction indicating the enabling or disabling of the transform precoder for the PUSCH via the DCI / MAC CE, and may switch the waveform (CP-OFDM / DFT-s-OFDM) to be used for the PUSCH based on the instruction.

[0044] The total DCI size of the DCI format may be constant regardless of whether the transform precoder is disabled or enabled. The size of the DCI format may be configured / determined by higher layer signaling (RRC). In other words, the size of the DCI format may not depend on the DCI / MAC CE.

[0045] However, the size of some DCI fields may differ depending on whether a transform precoder is disabled or enabled. Examples of such DCI fields include "Precoding information and number of layers," "Antenna ports," "DMRS sequence initialization," "PTRS-DMRS association," "Frequency resource assignment," and "Frequency hopping flag." For example, the DCI sizes may differ as shown in (1) to (6) of the existing specifications described above.

[0046] [Option 1-1] When dynamic switching of transform precoder for PUSCH (switching by DCI / MAC CE) is configured for PUSCH, for each DCI format, the total size of the DCI format may be the larger of the size of each DCI format when the transform precoder is disabled and the size of each DCI format when the transform precoder is enabled.

[0047] If the transform precoder is disabled / enabled by the MAC CE, the UE may read each DCI field from the least significant bit (LSB) or from the most significant bit (MSB), depending on the size of each DCI field.

[0048] Fig. 1 is a diagram showing the DCI size of option 1-1. According to Fig. 1, the number of DCI bits (total of DCI fields #1 to #4) when the transform precoder is disabled is 10 bits, and the number of DCI bits when the transform precoder is enabled is 7 bits. In this case, the larger DCI size of 10 bits is used as the total DCI size when dynamic switching of the transform precoder is set.

[0049] In Figure 1, the smaller DCI bits (DCI bits when the transform precoder is enabled) are mapped from the left (least significant bit) but may also be mapped from the right (most significant bit), i.e., the UE may read each DCI field from the least significant bit or from the most significant bit.

[0050] Option 1-1 allows for a smaller total DCI size than Option 1-2, which will be described later.

[0051] [Option 1-2] When dynamic switching of transform precoder for PUSCH is set for PUSCH, for each DCI format, the larger of the size of the DCI field when the transform precoder is disabled and the size of the DCI field when the transform precoder is enabled is determined for each field, and the total size of the DCI format may be the sum of the larger sizes of all DCI fields.

[0052] That is, if the number of fields in a DCI format is N, the total size of the DCI format is calculated as follows: Total size of DCI format = Σ(MAX(size of DCI field i when transform precoder is disabled, size of DCI field i when transform precoder is enabled)) (i = 1 to N)

[0053] If the transform precoder is disabled / enabled by the MAC CE, the UE may read each DCI field starting from the least significant bit (LSB), depending on the size of each DCI field, or the UE may read each DCI field starting from the most significant bit (MSB).

[0054] Figure 2 is a diagram showing the DCI size of option 1-2. According to Figure 2, in DCI Field #1, the larger of the DCI field size (2 bits) when the transform precoder is disabled and the DCI field size (1 bit) when the transform precoder is enabled is 2 bits. Similarly, the larger size is 3 bits for DCI Field #2, 2 bits for DCI Field #3, and 4 bits for DCI Field #4. By adding up these sizes (2 + 3 + 2 + 4 = 11), 11 bits are used as the total DCI size when dynamic switching of the transform precoder is configured.

[0055] In Figure 2, in each field, the smaller DCI bits are mapped from the left (least significant bit) side, but they may also be mapped from the right (most significant bit) side. That is, the UE may read each DCI field from the least significant bit side, or from the most significant bit side.

[0056] In the example of Figure 2, the bit at the start position of each field (the bit range used for each field) is the same whether the transform precoder is disabled or enabled. For example, the start position of DCI Field #1 is the first bit, the start position of DCI Field #2 is the third bit, the start position of DCI Field #3 is the sixth bit, and the start position of DCI Field #4 is the eighth bit. This makes it easier for the UE to detect each field.

[0057] According to the first embodiment, even if the transform precoder is switched between enabled and disabled, the DCI size to be detected remains the same, so that an increase in the processing load on the UE can be suppressed.

[0058] <Second embodiment> When dynamic switching of the transform precoder for the PUSCH (switching by DCI / MAC CE) is configured, the following option 2-1 or 2-2 may be applied in the PUSCH power control.

[0059] As shown in FIG. 3, in 3GPP Rel. 16, the PUSCH power control information element (PUSCH-PowerControl information element) of the RRC parameters includes "twoPUSCH-PC-AdjustmentStates" indicating the number of PUSCH power control adjustment states (1 or 2) and "sri-PUSCH-ClosedLoopIndex" which is a parameter indicating an index of the closed-loop power control state.

[0060] [Option 2-1] The UE may use one common (one set of) closed-loop for both waveforms (CP-OFDM and DFT-s-OFDM), and the UE may count (or accumulate) TPC commands regardless of the waveform indicated.

[0061] However, if a base station (gNB) indicates sri-PUSCH-ClosedLoopIndex=i0 for CP-OFDM and sri-PUSCH-ClosedLoopIndex=i1 for DFT-s-OFDM, counting of two closed loops may be possible depending on the base station implementation.

[0062] [Option 2-2] The UE may use two separate (two sets of) closed loops for each waveform (CP-OFDM and DFT-s-OFDM), and may count the TPC commands for each waveform separately.

[0063] If "twoPUSCH-PC-AdjustmentStates" is set to "twoStates", sri-PUSCH-ClosedLoopIndex{i0, i1} is used for CP-OFDM, and an additional parameter sri-PUSCH-ClosedLoopIndex_2nd{i0, i1} may be used for DFT-s-OFDM.

[0064] If "twoStates" is not set in "twoPUSCH-PC-AdjustmentStates", sri-PUSCH-ClosedLoopIndex in the current specifications may be reused. That is, sri-PUSCH-ClosedLoopIndex{i0, i1} may be set, and if CP-OFDM is applied, sri-PUSCH-ClosedLoopIndex=i0 may be set, and if DFT-s-OFDM is applied, sri-PUSCH-ClosedLoopIndex=i1 may be set.

[0065] If "twoStates" is not set in "twoPUSCH-PC-AdjustmentStates," sri-PUSCH-ClosedLoopIndex in the current specification does not need to be reused. That is, sri-PUSCH-ClosedLoopIndex={i0} and sri-PUSCH-ClosedLoopIndex_2nd={i0} are set. Then, sri-PUSCH-ClosedLoopIndex=i0 may be used for CP-OFDM, and sri-PUSCH-ClosedLoopIndex_2nd=i0 may be used for DFT-s-OFDM. In this example, i1 may be used instead of i0.

[0066] The control of this embodiment may be applied not only to closed-loop power control but also to open-loop power control. PUSCH RB,b,f,c (i), P O_PUSCH,b,f,c (j), α b,f,c (j), P.L. b,f,c (q d ) and other parameters. For example, P O_PUSCH,b,f,c (j), α b,f,c (j) is the P indicated by sri-P0-PUSCH-AlphaSetId shown in Figure 3 O and α, and PL b,f,c (q d ) is based on the path loss indicated by sri-PUSCH-PathlossReferenceRS-Id. P O Multiple values ​​of α and α may be set for each PUSCH power setting (PUSCH-PowerControl). One common (one set) of open-loop control parameters may be used for both waveforms (CP-OFDM and DFT-s-OFDM), or two separate (two sets) of open-loop control parameters may be used for both waveforms.

[0067] When comparing DFT-s-OFDM with contiguous PRB allocation and CP-OFDM with non-contiguous PRB allocation in terms of BLER (or required SNR), CP-OFDM is superior due to its frequency diversity gain. Diversity is improved especially when the number of PRBs is small. Also, MIMO may be applied to CP-OFDM, whereas MIMO is not applied to DFT-s-OFDM. Therefore, the target SNR may differ. Therefore, flexible power control is possible by setting a closed loop for each waveform.

[0068] According to the second embodiment, even when the waveform is switched, appropriate open-loop / closed-loop control parameters can be set.

[0069] <Third embodiment> [Aspect 3-1] The UE may receive the DCI and determine (switch) the waveform to be used for the PUSCH (DFT-s-OFDM or CP-OFDM) based on the modulation and coding scheme (MCS) field of the DCI. That is, the UE determines the waveform based on implicit signaling by the DCI.

[0070] FIG. 4 is a diagram showing a first example of an MCS table in 3GPP Rel. 16. FIG. 5 is a diagram showing a second example of an MCS table in 3GPP Rel. 16. The MCS index corresponds to the MCS field of the DCI. Based on the table shown in FIG. 4 or 5, the UE may use DFT-s-OFDM for the PUSCH when the MCS index, modulation order, target code rate, and spectral efficiency are smaller / greater than a predetermined value (X), and may use CP-OFDM in other cases (greater / equal to or less than the predetermined value). The value of X may be defined in a specification, may be set by higher layer signaling, or may be set according to a UE capability report.

[0071] Since DFT-s-OFDM is beneficial at the cell edge, a lower MCS may be used. If the MCS indicated in the DCI scheduling the PUSCH is less than a certain value and of a certain modulation order (corresponding to QPSK), DFT-s-OFDM may be used for the PUSCH; otherwise, CP-OFDM may be used depending on the RRC configuration.

[0072] For example, the UE may use DFT-s-OFDM for PUSCH when the MCS index / modulation order / target code rate / spectral efficiency falls within the area surrounded by dotted lines in Figures 4 and 5 (when QPSK is used), and may use CP-OFDM in other cases.

[0073] In the current specification, different MCS tables are used for CP-OFDM and DFT-s-OFDM. The MCS table shows the relationship between MCS index, modulation order, target code rate, and spectral efficiency, as shown in the examples of Figures 4 and 5.

[0074] When dynamic waveform switching is configured, the UE may determine a waveform using the MCS of the DCI and a specific MCS table. That is, the UE may determine the modulation order / target code rate / spectral efficiency corresponding to the value of the MCS index field of the DCI in the specific MCS table, and determine a waveform based on the modulation order / target code rate / spectral efficiency. The specific MCS table to be used may be any of the following (1) to (3).

[0075] (1) MCS table specified / configured for CP-OFDM. (2) MCS table specified / configured for DFT-s-OFDM. (3) Either the CP-OFDM MCS table or the DFT-s-OFDM MCS table is set in advance by higher layer signaling.

[0076] [Aspect 3-2] The UE may determine (switch between) the PUSCH waveform (DFT-s-OFDM / CP-OFDM) based on the resource allocation. For example, the UE may determine the waveform based on the frequency domain resource assignment field of the DCI.

[0077] For example, the UE may determine that the frequency domain resource allocation field is a product of powers of 2, 3, and 5 for consecutive PRBs (M RB PUSCH =2 α2 3 α3 5 α5 ), it may decide to use DFT-s-OFDM, and otherwise decide to use CP-OFDM.

[0078] [Aspect 3-3] The UE determines the indicated rank / layer from the DCI's precoding information and number of layers field. Then, if rank 1 (single layer) is indicated, the UE may use DFT-s-OFDM for PUSCH, and in other cases (i.e., when multiple layers are indicated), the UE may use CP-OFDM for PUSCH. In other words, when multiple layers are indicated, the UE may apply CP-OFDM to PUSCH, and in other cases, the UE may apply DFT-s-OFDM to PUSCH. That is, the UE determines the waveform to be used for PUSCH based on the "precoding information and number of layers" field.

[0079] In addition to whether rank 1 is indicated, the UE may also determine the waveform considering the MCS. For example, the UE may apply DFT-s-OFDM when, for example, rank 1 and MCS < X, and in other cases, the UE may apply CP-OFDM to PUSCH. Or, the UE may determine the waveform only according to whether rank 1 is indicated without considering the MCS.

[0080] When the transmission configuration information (txConfig) is set in the PUSCH configuration (PUSCH-Config) (i.e., when UL MIMO is set), the UE may select DFT-s-OFDM or CP-OFDM based on the number of ranks / layers indicated in the DCI field (and the corresponding table). The DCI field may be the precoding information and number of layers "precoding information and number of layers" field in the case of codebook MIMO, or may be the SRI field in the case of non-codebook MIMO.

[0081] In the specifications, different "precoding information and number of layers" tables are specified for CP-OFDM and DFT-s-OFDM. In this embodiment, the UE first selects one table (CP-OFDM or DFT-s-OFDM table) and then selects DFT-s-OFDM or CP-OFDM depending on the number of layers.

[0082] If dynamic waveform switching is configured, the "precoding information and number of layers" field may be determined based on the assumption of CP-OFDM.

[0083] For example, the UE may be configured by RRC signaling to use DFT-s-OFDM when rank 1 is configured and to use CP-OFDM when rank 2 is configured. Even in this case, the waveform may be specified assuming CP-OFDM (using the "precoding information and number of layers" table when the transform precoder is disabled).

[0084] Fig. 6 is a diagram showing a "precoding information and number of layers" table when the transform precoder is disabled in 3GPP Rel. 16. In the table of Fig. 6, when the "precoding information and number of layers" field of the DCI indicates the part shown in the dotted frame (when 1 layer is indicated), the UE applies DFT-s-OFDM, and when any other part is indicated, the UE applies CP-OFDM.

[0085] Figure 7 is a diagram showing the "precoding information and number of layers" table when the transform precoder is enabled in 3GPP Rel. 16. In the table in Figure 7, since there is one layer in all cases, the UE applies DFT-s-OFDM in response to the instruction of DCI.

[0086] [[Variation 1]] If dynamic waveform switching (CP-OFDM / DFT-s-OFDM) is enabled by higher layer signaling, a new "precoding information and number of layers" table may be applied. If dynamic waveform switching is configured, the bit size of the "precoding information and number of layers" field may be x bits.

[0087] FIG. 8 is a diagram showing the "precoding information and number of layers" table when dynamic waveform switching is set. FIG. 8 is a table in which a new field (column) is added to the example of FIG. 6. A waveform (CP-OFDM / DFT-s-OFDM) instruction may be set / defined in this new field. The waveform instruction may be set for each index or for multiple indexes. The waveform instruction may be information indicating whether a transform precoder is enabled / disabled.

[0088] The new table as shown in Figure 8 may be defined separately from the existing table as shown in Figure 6. Then, the UE may use the new table if dynamic waveform switching is configured by higher layer signaling, and may use the existing table if not configured.

[0089] The new table shown in Figure 8 may be an updated table that adds a new field to the existing table shown in Figure 6. If dynamic waveform switching is configured by higher layer signaling, the UE determines the waveform by referring to the waveform instruction in the new field. If dynamic waveform switching is not configured, the UE may determine that the transform precoder is disabled (CP-OFDM).

[0090] [[Variation 2]] The UE may use DFT-s-OFDM for the PUSCH if rank 1 (single layer) or a single antenna port is indicated, and may use CP-OFDM otherwise.

[0091] When the transmission configuration information (txConfig) is configured in the PUSCH configuration (PUSCH-Config) (i.e., when UL MIMO is configured), the UE may select DFT-s-OFDM or CP-OFDM based on the number of ranks / layers indicated in the DCI field (and the corresponding table). The DCI field may be a "precoding information and number of layers" field in the case of codebook MIMO, or an SRI field in the case of non-codebook MIMO.

[0092] If the transmission configuration information (txConfig) is not configured in the PUSCH configuration (PUSCH-Config) (that is, if UL MIMO is not configured), the UE may use DFT-s-OFDM.

[0093] [Aspect 3-4] The UE may determine whether the PUSCH and the demodulation reference signal (DMRS) are frequency division multiplexed (FDM) based on the antenna port field of the DCI. If the PUSCH and the DMRS are FDM-multiplexed, the UE may use a CP-OFDM waveform for the PUSCH, and if the PUSCH and the DMRS are not FDM-multiplexed, the UE may use a DFT-s-OFDM waveform for the PUSCH. That is, the UE may determine the waveform to use for the PUSCH based on the antenna port field of the DCI.

[0094] The UE can determine whether the PUSCH and DMRS are FDM-modulated based on the "number of DMRS CDM group(s) without data" in the table corresponding to the antenna port field of the DCI. If the "number of DMRS CDM group(s) without data" corresponding to the antenna port field is 1, the UE determines that the PUSCH and DMRS are FDM-modulated and decides to use CP-OFDM. If the "number of DMRS CDM group(s) without data" corresponding to the antenna port field is other than 1, the UE determines that the PUSCH and DMRS are not FDM-modulated and decides to use DFT-s-OFDM.

[0095] 9 is a table corresponding to the antenna port field when the transform precoder is disabled in Rel. 16. When the antenna port field (Value) is 0 or 1, the UE determines that the PUSCH and DMRS are FDM-modulated because the "number of DMRS CDM group(s) without data" is 1, and decides to use CP-OFDM. On the other hand, when the antenna port field (Value) is other than 0 or 1, the UE decides to use DFT-s-OFDM.

[0096] Figure 10 is a table corresponding to the antenna port field when the transform precoder is enabled in 3GPP Rel. 16. In the example of Figure 10, since all of the "number of DMRS CDM group(s) without data" are 2 (not 1), the UE determines that the PUSCH and DMRS are not FDM-modulated, regardless of the value of the antenna port field, and decides to use DFT-s-OFDM. In other words, in the existing specifications, FDM between the PUSCH and DMRS is only permitted for CP-OFDM.

[0097] Alternatively, the UE may first select one table (e.g., a table corresponding to CP-OFDM) and then select DFT-s-OFDM or CP-OFDM according to the "number of DMRS CDM group(s) without data." If dynamic waveform switching is configured, the antenna port field ("number of DMRS CDM group(s) without data") may be determined based on the assumption of CP-OFDM.

[0098] In Rel.15 / 16, the "number of DMRS CDM group(s) without data" dynamically indicates whether PUSCH and DMRS are FDM-multiplexed. When DFT-s-OFDM is used, PUSCH and DMRS are always FDM-free.

[0099] Fig. 11 is a diagram showing a PUSCH resource configuration when a PUSCH and a DMRS are FDM-multiplexed. Fig. 11 is applied, for example, when "number of DMRS CDM group(s) without data" is 1 in DMRS type 1. In Fig. 11, a PUSCH is allocated in resources between multiple DMRSs in the frequency direction. In other words, the PUSCH and the DMRS are FDM-multiplexed. In this case, the UE uses CP-OFDM.

[0100] Fig. 12 is a diagram showing a PUSCH resource configuration when the PUSCH and DMRS are not FDM-multiplexed. Fig. 12 is applied, for example, when the "number of DMRS CDM group(s) without data" is 2 for DMRS type 1. In Fig. 12, no signal / channel is allocated (used) in the resources between multiple DMRSs in the frequency direction. In other words, the PUSCH and DMRS are not FDM-multiplexed. In this case, the UE uses DFT-s-OFDM.

[0101] According to the third embodiment, the UE can determine the waveform based on the existing DCI field, thereby suppressing an increase in the size of the DCI.

[0102] <Fourth embodiment> When waveform switching using DCI / MAC CE is configured (either implicitly or explicitly), a waveform switching delay may be introduced. The UE uses / determines (sets) the minimum value of K2 (the period from DCI reception to PUSCH transmission) as a second period for dynamic waveform switching, which is longer than the first period when dynamic waveform switching is not performed. When the UE receives an instruction indicating disabling or enabling of a transform precoder for PUSCH via DCI / MAC CE, the UE may apply the second period as the period from DCI reception to PUSCH transmission.

[0103] If dynamic waveform switching is configured (e.g., by higher layer signaling), the K2 value may correspond to at least one of the following: a specification definition, a configuration by higher layer signaling, and / or a reported UE capability. In this case, a longer K2 value than the existing value may be applied regardless of whether dynamic waveform switching is indicated by DCI / MAC CE.

[0104] If the DCI / MAC CE indicates PUSCH waveform switching, the K2 value may correspond to at least one of the following: a specification definition, a configuration by higher layer signaling, and / or a reported UE capability. Also, a longer K2 value than the existing value may be applied only if dynamic waveform switching is indicated by the DCI / MAC CE.

[0105] The minimum value of K2 to be set may be an additional value of the existing minimum value of K2 or an absolute value of K2. The minimum value of K2 may be different or the same depending on the sub-carrier spacing (SCS).

[0106] Fig. 13A is a diagram showing an example of setting the minimum value of K2 for each SCS. K2_X in Fig. 13A is a value that takes into account dynamic switching of waveforms and is SCS (kHz). Fig. 13B is a diagram showing examples of the existing minimum K2 value and the new minimum K2_X value. The new minimum K2_X value is larger than the existing minimum K2 value because it takes into account dynamic switching of waveforms.

[0107] [PUSCH scheduling by base station] When a UE is scheduled for a PUSCH by a base station (gNB), the UE receives DCI including a time domain resource assignment (TDRA) corresponding to the minimum K2 value. The UE also receives a value to be added to the TDRA (hereinafter referred to as an additional value) that takes into account dynamic waveform switching via higher layer signaling / MAC CE / DCI. The UE uses the value obtained by adding the additional value to the TDRA as a delay period (a period from receiving DCI to transmitting PUSCH) that takes into account dynamic waveform switching.

[0108] If multiple minimum K2 values ​​are specified, it may not be desirable to apply the TDRA table as is. This is because some TDRA values ​​may be smaller than the K2 value that takes dynamic waveform switching into account. Therefore, if dynamic waveform switching is configured (or only if the DCI format indicates waveform switching for PUSCH), an additional symbol / slot value may be added to the time domain resource indicated by TDRA. If an additional value for dynamic waveform switching is configured by RRC and K2 and the additional value are smaller than a predetermined value, the additional value may be invalid.

[0109] For example, a new RRC parameter (e.g., dynamicWaveformSwitching) may be configured and an additional value may be set by the parameter. For existing UEs (e.g., Rel. 15 / 16), the new RRC parameter is not indicated and dynamic waveform switching is not performed, so no additional value may be added.

[0110] If dynamic waveform switching is configured and the UE has set the K2 value by the RRC parameter minimumSchedulingOffsetK2, the UE may apply a minimum scheduling offset restriction of an additional value (or the default value) if the UE does not receive the "Minimum applicable scheduling offset indicator" field in DCI type 0_1 or 1_1. Note that in existing systems, the UE sets the additional value to 0.

[0111] The additional value of K2 (X symbols / slot) may be the same or different depending on the SCS. A fixed value may be defined for each SCS. The additional value may be defined in the specification or configured by higher layer signaling. If the additional value is absent, the UE may use 0 or a predetermined value (default value) as the additional value.

[0112] If the additional value is included in an information element that does not depend on the BWP configuration (for example, "MAC-CellGroupConfig"), it may be set for each SCS. If the additional value is included in an information element that depends on the BWP configuration (for example, "PUSCH-Config"), the SCS is determined according to the information element, so it does not need to be set for each SCS. The unit of the additional value may be a subframe, in which case it does not need to be set for each SCS.

[0113] Fig. 14A is a diagram showing an example of setting an additional value of K2 for each SCS. The additional value in Fig. 14A is an additional value of K2 that takes into account dynamic waveform switching. Fig. 14B is a diagram showing an example of an additional value for TDRA. As shown in Fig. 14B, a period obtained by adding an additional value to the value indicated by TDRA may be applied to the period from DCI reception to PUSCH transmission.

[0114] [[Add to TimeDomainAllocationList]] Fig. 15 is a diagram showing an example of a TimeDomainAllocationList including an additional value. As shown in Fig. 15, by newly including an additional value in the TimeDomainAllocationList, an additional value can be set for each K2.

[0115] When dynamic waveform switching is configured (or only when the DCI format indicates PUSCH waveform switching), the UE may not transmit (may drop) a scheduled PUSCH in which K2 (indicated by TDRA) + additional value (if configured) is smaller than the minimum value of K2 when instructing dynamic waveform switching. Note that whether the DCI format indicates PUSCH waveform switching may become unclear due to a failure in DCI transmission (the base station and the UE may have different understandings). Therefore, the UE may perform the above process when dynamic waveform switching is configured (regardless of whether waveform switching by DCI is performed or not).

[0116] <Other> When dynamic waveform switching of PUSCH is performed by MAC CE signaling, after receiving the indication by MAC CE, the UE may switch the waveform after a predetermined time (e.g., 3 ms) for transmitting an ACK for the PDSCH including the MAC CE. After receiving the waveform switching instruction by MAC CE, the UE may transmit a reception completion notification (e.g., by a predetermined physical channel or MAC CE) to the base station. Thereby, it is possible to prevent the waveform recognition between the base station and the UE from being inconsistent due to the transmission failure of the MAC CE.

[0117] <UE capability> The UE may transmit (report) UE capability information indicating whether it supports at least one of each process in the present disclosure to the network (base station). At least one of the above-described embodiments may be applied only to a UE that has reported a specific UE capability or supports the specific UE capability.

[0118] The specific UE capability may indicate at least one of the following: (1) Whether it supports dynamic switching of waveforms (activation / deactivation of the conversion precoder). (2) Whether DCI / MAC CE can switch the waveform (conversion precoder). (3) The DCI format supported by the UE. (4) Whether the UE supports two separate (two sets of) CL loops for each waveform.

[0119] Also, the UE may receive information for instructing / setting at least one of each process in the present disclosure by DCI / MAC CE / upper layer signaling (e.g., RRC, etc.), and perform the process in the present disclosure when receiving the information. The information may correspond to the UE capability information transmitted by the UE. The information (e.g., RRC parameter) may be set to one for all DCI formats, or may be set to one for each DCI format, respectively.

[0120] (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.

[0121] 16 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).

[0122] 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.

[0123] 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.

[0124] 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))).

[0125] 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.

[0126] 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).

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0132] 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).

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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).

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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).

[0146] (base station) 17 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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 .

[0158] 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 .

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] The transceiver unit 120 may transmit an instruction to disable or enable a transform precoder for a physical downlink shared channel (PUSCH) by at least one of downlink control information (DCI) and a medium access control element (MAC CE). The control unit 110 may assume that a waveform used for the PUSCH is switched based on the instruction.

[0164] When switching of the transform precoder for the PUSCH by at least one of the DCI and the MAC CE is configured, the size of each DCI format may be the larger of the size of each DCI format when the transform precoder is disabled and the size of each DCI format when the transform precoder is enabled.

[0165] When switching of the transform precoder for the PUSCH is configured by at least one of the DCI and the MAC CE, the larger of the size of the DCI field when the transform precoder is disabled and the size of the DCI field when the transform precoder is enabled is determined for each DCI field, and the total size of the DCI format may be the sum of the larger sizes of all DCI fields.

[0166] When switching of the transform precoder for the PUSCH by at least one of the DCI and the MAC CE is configured, two separate closed loops may be configured for each waveform.

[0167] The transceiver 120 may transmit downlink control information (DCI). The controller 110 may assume that a waveform used for a physical downlink shared channel (PUSCH) is determined based on at least one of a modulation and coding scheme (MCS) field, a frequency domain resource allocation field, a precoding information and number of layers field, and an antenna port field of the DCI.

[0168] The transceiver 120 may transmit a configuration indicating that disabling or enabling of a transform precoder for a physical downlink shared channel (PUSCH) is dynamically switched by at least one of downlink control information (DCI) and a medium access control element (MAC CE). The control unit 110 may assume that a second period longer than a first period when the waveform is not switched is used as a period from reception of the DCI to transmission of the PUSCH.

[0169] (user terminal) 18 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] The transceiver unit 220 may receive an instruction to disable or enable a transform precoder for a physical downlink shared channel (PUSCH) via at least one of downlink control information (DCI) and a medium access control element (MAC CE). The control unit 210 may switch the waveform used for the PUSCH based on the instruction.

[0187] When switching of the transform precoder for the PUSCH by at least one of the DCI and the MAC CE is configured, the size of each DCI format may be the larger of the size of each DCI format when the transform precoder is disabled and the size of each DCI format when the transform precoder is enabled.

[0188] When switching of the transform precoder for the PUSCH is configured by at least one of the DCI and the MAC CE, the larger of the size of the DCI field when the transform precoder is disabled and the size of the DCI field when the transform precoder is enabled is determined for each DCI field, and the total size of the DCI format may be the sum of the larger sizes of all DCI fields.

[0189] When switching of the transform precoder for the PUSCH by at least one of the DCI and the MAC CE is configured, two separate closed loops may be configured for each waveform.

[0190] The transceiver 220 may receive downlink control information (DCI). The controller 210 may determine a waveform to be used for a physical downlink shared channel (PUSCH) based on at least one of a modulation and coding scheme (MCS) field, a frequency domain resource allocation field, a precoding information and number of layers field, and an antenna port field of the DCI.

[0191] The control unit 210 may use a Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform for the PUSCH if the MCS field is smaller than a predetermined value, and may use a Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform if the MCS field is greater than or equal to the predetermined value.

[0192] The control unit 210 may determine the indicated layer based on the precoding information and the number of layers field, and if a single layer is indicated, may use a DFT-s-OFDM waveform for the PUSCH, and if a multi-layer is indicated, may use a CP-OFDM waveform.

[0193] The control unit 210 determines whether the PUSCH and the demodulation reference signal (DMRS) are frequency division multiplexed (FDM) based on the antenna port field, and if the PUSCH and the DMRS are FDM multiplexed, it may use a CP-OFDM waveform for the PUSCH, and if the PUSCH and the DMRS are not FDM multiplexed, it may use a DFT-s-OFDM waveform for the PUSCH.

[0194] The transceiver unit 220 may receive a configuration indicating that disabling or enabling of a transform precoder for a physical downlink shared channel (PUSCH) is dynamically switched by at least one of downlink control information (DCI) and a medium access control element (MAC CE). The control unit 210 may use a second period, which is longer than a first period when the waveform is not switched, as a period from reception of the DCI to transmission of the PUSCH.

[0195] The transceiver unit 220 may receive an instruction indicating disabling or enabling a transform precoder for the PUSCH through at least one of the DCI and the MAC CE. When the control unit 210 receives the instruction, the control unit 210 may use the second period as a period from reception of the DCI to transmission of the PUSCH.

[0196] The transceiver 220 may receive DCI including a time domain resource allocation (TDRA) and may receive a value to be added to the TDRA. The controller 210 may use a value obtained by adding the value to the TDRA as the second period. The second period may vary depending on a subcarrier spacing (SCS).

[0197] (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.

[0198] 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.

[0199] 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. 19 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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).

[0209] 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.

[0210] 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.

[0211] (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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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."

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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).

[0238] 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).

[0239] 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).

[0240] 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.

[0241] 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.

[0242] 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).

[0243] 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.

[0244] 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.

[0245] 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.

[0246] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0247] 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.

[0248] 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. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. 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). 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), 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-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0254] 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."

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0260] 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.

[0261] 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."

[0262] 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.

[0263] 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."

[0264] 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.

[0265] 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.

[0266] 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 receiving unit that receives a Radio Resource Control (RRC) parameter indicating that a transform precoder for a physical uplink shared channel (PUSCH) is dynamically disabled or enabled by downlink control information (DCI); A control unit that determines whether the conversion precoder for the PUSCH is valid or invalid based on an instruction included in the DCI, A terminal, wherein the size of each field in the DCI is the larger of the size when the transform precoder is disabled and the size when the transform precoder is enabled.

2. The terminal according to claim 1 , wherein the RRC parameters are set separately for each DCI format.

3. receiving a Radio Resource Control (RRC) parameter indicating dynamic disabling or enabling of a transform precoder for a Physical Uplink Shared Channel (PUSCH) via downlink control information (DCI); Determining whether the transform precoder for the PUSCH is enabled or disabled based on an instruction included in the DCI; A wireless communication method for a terminal, wherein the size of each field in the DCI is the larger of the size when the transform precoder is disabled and the size when the transform precoder is enabled.

4. a transmitter configured to transmit a Radio Resource Control (RRC) parameter indicating that a transform precoder for a physical uplink shared channel (PUSCH) is dynamically disabled or enabled by downlink control information (DCI); A control unit that determines whether the conversion precoder for the PUSCH is valid or invalid based on an instruction included in the DCI, A base station, wherein the size of each field in the DCI is the larger of the size when the transform precoder is disabled and the size when the transform precoder is enabled.

5. A system having a terminal and a base station, The terminal a receiving unit that receives a Radio Resource Control (RRC) parameter indicating that a transform precoder for a physical uplink shared channel (PUSCH) is dynamically disabled or enabled by downlink control information (DCI); A control unit that determines whether the conversion precoder for the PUSCH is valid or invalid based on an instruction included in the DCI, The base station a transmitter for transmitting the RRC parameters; A system in which the size of each field in the DCI is the larger of the size when the transform precoder is disabled and the size when the transform precoder is enabled.

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