Terminal, wireless communication method, base station, and system

Abstract

A terminal according to one embodiment of the present disclosure is characterized by including: a reception unit that receives, using at least one of downlink control information (DCI) and a Medium Access Control Control Element (MAC CE), an instruction indicating invalidation or validation of a transform precoder with respect to a physical downlink shared channel (PUSCH); and a control unit that switches, on the basis of the instruction, the waveform used in the PUSCH. According to one embodiment of the present disclosure, switching of the waveform can be easily carried out.

Description

Technical Field

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

Background Art

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

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a wireless communication system (for example, NR, etc.), in addition to the Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform which is a single carrier waveform, it has been considered to support the Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform which is a multi-carrier waveform.

[0006] However, since the conventional waveform setting has been performed by Radio Resource Control (RRC), in order to switch the waveform, reconfiguration of RRC was necessary. As a result, the signaling overhead increases, and there is a possibility that the communication throughput decreases.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method 、 base station and the system that can easily perform waveform switching.

Means for Solving the Problems

[0008] A terminal according to an aspect of the present disclosure receives an instruction indicating invalidation or validation of a conversion precoder for a Physical Uplink Shared Channel (PUSCH) from Downlink Control Information (DCI ) to and, based on the instruction, controls the PUSCH determine whether the conversion pre - coder is invalid or valid for control unit , and have the size of each field in the DCI is the larger of the size when the conversion pre - coder is invalid and the size when the conversion pre - coder is valid This is characterized by the above.

Effects of the Invention

[0009] According to an aspect of the present disclosure, waveform switching can be easily performed.

Brief Description of the Drawings

[0010]

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DETAILED DESCRIPTION OF THE INVENTION

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

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

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

[0014] Also, the PUSCH transmission opportunity i is a predetermined period during which the PUSCH is transmitted and may be composed of, for example, one or more symbols, one or more slots, etc.

[0015]

Equation

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

[0017] M PUSCH RB,b,f,c (i) is, for example, the number of resource blocks (bandwidth) allocated to the PUSCH for transmission opportunity i in active UL BWP b of carrier f of serving cell c and subcarrier spacing μ. α b,f,c(j) is a value provided by the upper layer parameters (also referred to as, for example, 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 the downlink BWP associated with the active UL BWP b of carrier f of serving cell c. d The path loss (path loss compensation) calculated at the user terminal using this.

[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 a value (e.g., power control adjustment state, cumulative value of TPC command, value by closed loop) based on the TPC command of the power control adjustment state index l of the active UL BWP of carrier f of 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), PL b,f,c (q d )). Also, the parameters related to closed loop control are f b,f,c (i, l). That is, the transmission power of PUSCH is determined by open loop control and closed loop control with the maximum transmit 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 the Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform, which is a multi-carrier waveform, the Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform, which is a single-carrier waveform, is supported. The "waveform" in the present disclosure refers to at least one of the CP-OFDM waveform (CP-OFDM-based waveform) and the DFT-s-OFDM waveform (DFT-s-OFDM-based waveform).

[0023] For CP-OFDM, frequency resource allocation can be performed more flexibly. For example, both continuous Physical Resource Block (PRB) allocation and discontinuous PRB allocation are allowed. Also, continuous PRB allocation is not limited to multiples of 2, 3, or 5. When applying CP-OFDM, Frequency Division Multiplexing (FDM) may be used for the DeModulation Reference Signal (DMRS) and PUSCH.

[0024] For DFT-s-OFDM, although there are significant constraints on frequency resource allocation, it has a low Peak to Average Power Ratio (PAPR) and is suitable for UEs with limited power.

[0025] Regarding the communication throughput without considering PAPR, CP-OFDM has a higher communication throughput than DFT-s-OFDM. Regarding the communication throughput considering PAPP, when SNR(MCS) is high (the modulation and coding scheme is 16QAM or 64QAM), the communication throughput of CP-OFDM is higher than that of DFT-s-OFDM. However, when SNR(MCS) is low (the modulation and coding scheme is QPSK), DFT-s-OFDM has a higher communication throughput than CP-OFDM. That is, the preferred waveform varies according to SNR(MCS).

[0026] Normally, the network (NW) switches the waveform based on the Signal to Noise Ratio (SNR). The switching between DFT-s-OFDM and CP-OFDM is performed by the transform precoder in the Physical Uplink Shared Channel (PUSCH) configuration (PUSCH-Config) of the Radio Resource Control (RRC) signaling for the uplink shared channel. When the transform precoder is disabled, CP-OFDM is applied, and when it is enabled, DFT-s-OFDM is applied. Reconfiguration of RRC is required for waveform switching. This may increase the signaling overhead and reduce the communication throughput.

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

[0028] For example, in existing specifications (e.g., 3GPP Rel.16), as shown in the following (1) to (6), the sizes of some DCI fields in the DCI format (e.g., DCI format 0_0 / 0_1 / 0_2) are affected by waveform switching. (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, it is 0 bits when the transform precoder is enabled and 1 bit when it is disabled. (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 allocation type. Also, depending on the waveform, the supported resource allocation is different. CP-OFDM supports resource allocation types 0, 1, 2, and DFT-s-OFDM supports resource allocation types 1, 2. (6) In the "Frequency hopping flag" field, the DCI size varies depending on the resource allocation type. As described above, depending on the waveform, the supported resource allocation is different.

[0029] Since the conventional waveform settings were performed by RRC, the UE could determine the size of the DCI format according to the waveform switching (based on the RRC settings). On the other hand, if the size of the DCI format fluctuates when the waveform is switched dynamically, it becomes difficult to control the monitoring, so it is preferably a constant size regardless of the waveform. However, how the DCI should be configured and how the UE determines the size of the DCI have not been studied yet.

[0030] Therefore, the inventors envisioned a terminal that can preferably dynamically switch the enabling and disabling (waveform switching) of the transform precoder for PUSCH by DCI / MAC CE.

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

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

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

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

[0035] In the present disclosure, the upper layer signaling may be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (such as Master Information Block (MIB), System Information Block (SIB), etc.), or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, upper layer, upper layer parameters, RRC information element (IE), RRC message may be read interchangeably with each other. The report in the present disclosure may be performed by upper layer signaling. "Report", "measurement", and "transmission" in the present disclosure may be read interchangeably with each other.

[0036] MAC signaling may use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0037] In addition, in the present disclosure, "A / B" may be read as "at least one of A and B". The application / use of CP-OFDM and the fact that the transform precoder is Disabled (deactivated) may be read as each other. The application / use of DFT-s-OFDM and the fact that the transform precoder is Enabled (activated) may be read as each other. The deactivation / activation of the transform precoder, the switching of the transform precoder, and the switching of the waveform (CP-OFDM / DFT-s-OFDM) may be read as each other. The waveform and the transform precoder may be read as each other. CP-OFDM and the CP-OFDM waveform may be read as each other. DFT-s-OFDM and the DFT-s-OFDM waveform may be read as each other.

[0038] (Wireless communication method) The UE may receive a setting indicating that the UE dynamically switches between deactivation and activation of the transform precoder for the PUSCH by DCI / MAC CE. Then, the UE may receive an instruction indicating activation or deactivation of the transform precoder for the PUSCH by DCI / MAC CE. Hereinafter, the dynamic switching by DCI / MAC CE may be simply described as dynamic switching. Note that the UE may be set in advance by upper layer signaling or the like to be able to dynamically switch the waveform / transform precoder (the switching is possible). Regardless of the presence or absence of such a setting, the dynamic switching of the transform precoder by DCI / MAC CE may be possible.

[0039] For example, the dynamic waveform switching based on DCI signaling may be performed implicitly or explicitly. For example, a 1-bit field indicating the CP-OFDM or DFT-s-OFDM waveform used for PUSCH may be included in the DCI (explicit signaling). For example, the UE may determine / identify the CP-OFDM or DFT-s-OFDM waveform used for PUSCH according to specific conditions among the scheduling information in the DCI, etc. (implicit signaling). In this case, the existing DCI format is not changed.

[0040] Alternatively, the dynamic UL waveform switching based on MAC CE signaling may be performed. For example, a 1-bit field indicating the CP-OFDM or DFT-s-OFDM waveform used for 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 PUSCH based on the existing fields of 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 other formats (for example, DCI format 0_3 for notifying waveform switching). As other formats, for example, group-common DCI such as DCI format 2_x may be used. In this case, the waveform switching may be applied after a certain time after the UE receives the DCI format 2_x and transmits an ACK.

[0042] The switching between the invalidation and activation of the conversion precoder (waveform switching) in the present disclosure may be the waveform switching in the same BWP (switching the waveform without switching the BWP). For example, since different conversion precoders can be set for each BWP, it is also conceivable to switch the conversion precoder by BWP switching. However, since a delay occurs due to BWP switching, the delay can be suppressed by switching between the invalidation and activation of the conversion precoder in the same BWP.

[0043] <First Embodiment> When it is set that the activation and deactivation of the transform precoder for PUSCH are dynamically switched by DCI / MAC CE, the UE may receive an instruction indicating the activation or deactivation of the transform precoder for PUSCH by DCI / MAC CE, and based on the instruction, switch the waveform (CP-OFDM / DFT-s-OFDM) used for PUSCH.

[0044] The total DCI size of the DCI format may be constant regardless of the deactivation and activation of the transform precoder. The size of the DCI format may be set / determined by upper layer signaling (RRC). That is, the size of the DCI format may not depend on DCI / MAC CE.

[0045] However, in some DCI fields, the size of each DCI field may differ depending on the deactivation and activation of the transform precoder. The said some DCI fields are, for example, "Precoding information and number of layers", "Antenna ports", "DMRS sequence initialization", "PTRS-DMRS association", "Frequency resource assignment", "Frequency hopping flag". For example, as shown in (1) to (6) of the existing specifications described above, the DCI sizes may be different.

[0046] [Option 1-1] When the dynamic switching of the transform precoder for PUSCH (switching by DCI / MAC CE) is set 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 inactive and the size of each DCI format when the transform precoder is active.

[0047] When the conversion pre-coder is disabled / enabled by the MAC CE, the UE may read each DCI field starting from the least significant bit (LSB) according to the size of each DCI field. Alternatively, the UE may read each DCI field starting from the most significant bit (MSB).

[0048] Figure 1 is a diagram showing the DCI size of Option 1-1. According to Figure 1, when the conversion pre-coder is invalid, the number of DCI bits (the sum of DCIField#1~#4) is 10 bits, and when the conversion pre-coder is valid, the number of DCI bits is 7 bits. In this case, the larger DCI size of 10 bits is used as the total DCI size when the dynamic switching of the conversion pre-coder is set.

[0049] In Figure 1, the smaller DCI bits (the DCI bits when the conversion pre-coder is valid) are filled and mapped from the left side (the least significant bit), but they may also be filled and mapped from the right side (the most significant bit). That is, the UE may read each DCI field starting from the least significant bit or starting from the most significant bit.

[0050] In Option 1-1, the total DCI size can be reduced compared to Option 1-2 described later.

[0051] [Option 1-2] When the dynamic switching of the conversion pre-coder for PUSCH is set for PUSCH, for each DCI format, the larger size between the size of the DCI field when the conversion pre-coder is invalid and the size of the DCI field when the conversion pre-coder is valid is determined for each field, and the total size of the DCI format may be the sum of the larger sizes in all DCI fields.

[0052] That is, when the number of fields of a certain 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 the conversion precoder is invalid, size of DCI field i when the conversion precoder is valid)) (i = 1 to N)

[0053] When the conversion precoder is invalidated / validated by the MAC CE, the UE may read each DCI field from the least significant bit (LSB) according to the size of each DCI field. Or, the UE may read each DCI field 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 size between the size of the DCI field when the conversion precoder is invalid (2 bits) and the size of the DCI field when the conversion precoder is valid (1 bit) is 2 bits. Similarly, for DCI Field #2, the larger size is 3 bits, for DCI Field #3 it is 2 bits, and for DCI Field #4 it is 4 bits. By summing these sizes (2 + 3 + 2 + 4 = 11), 11 bits are used as the total DCI size when the dynamic switching of the conversion precoder is set.

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

[0056] In the example of FIG. 2, whether the conversion pre-coder is invalid or valid, the bits at the start positions of each field (the bit ranges used for each field) are the same. For example, the start position of DCI Field #1 is the 1st bit, the start position of DCI Field #2 is the 3rd bit, the start position of DCI Field #3 is the 6th bit, and the start position of DCI Field #4 is the 8th bit. Therefore, the detection process of each field in the UE can be facilitated.

[0057] According to the first embodiment, even if the enabling / disabling of the conversion pre-coder is switched, since the DCI size to be detected is the same, an increase in the processing load of the UE can be suppressed.

[0058] <Second Embodiment> When dynamic switching of the conversion pre-coder for PUSCH (switching by DCI / MAC CE) is set, in PUSCH power control, the following Option 2-1 or 2-2 may be applied.

[0059] As shown in FIG. 3, in 3GPP Rel.16, the PUSCH power control information element of the RRC parameter includes "twoPUSCH-PC-AdjustmentStates" indicating the number of PUSCH power control adjustment states (1 or 2), and a parameter "sri-PUSCH-ClosedLoopIndex" indicating the 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). The UE may count (or accumulate) the TPC commands regardless of the indicated waveform.

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

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

[0063] If "twoStates" is set in "twoPUSCH-PC-AdjustmentStates", sri-PUSCH-ClosedLoopIndex {i0, i1} may be 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", the sri-PUSCH-ClosedLoopIndex of the current specification may be reused. That is, if sri-PUSCH-ClosedLoopIndex {i0, i1} is set and 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] When "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 Based on 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 and may be set for each PUSCH power setting (PUSCH-PowerControl). One common (one set) open-loop control parameter may be used for both waveforms (CP-OFDM and DFT-s-OFDM), or two separate (two sets) open-loop control parameters may be used for both waveforms.

[0067] Regarding the BLER (or required SNR), when comparing DFT-s-OFDM with continuous PRB allocation and CP-OFDM with discontinuous PRB allocation, CP-OFDM is superior because it has a frequency diversity gain. Especially when the number of PRBs is small, the diversity is improved. Also, in the case of CP-OFDM, MIMO may be applicable, while MIMO is not applicable to DFT-s-OFDM. Therefore, the target SNR may be different. Thus, by setting a closed loop for each waveform, flexible power control becomes possible.

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

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

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

[0071] Since DFT-s-OFDM is beneficial at the cell edge, it is considered that a lower MCS is used. When the MCS indicated in the DCI scheduling the PUSCH is smaller than a specific value and corresponds to a specific modulation order (corresponding to QPSK), DFT-s-OFDM is used for PUSCH, and otherwise, CP-OFDM may be used according to the RRC configuration.

[0072] For example, when the MCS index / modulation order / target code rate / spectral efficiency corresponds to the part enclosed by the dotted line in Figures 4 and 5 (when using QPSK), the UE may use DFT-s-OFDM for PUSCH, and otherwise, CP-OFDM may be used.

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

[0074] When dynamic switching of waveforms is configured, the UE may determine the 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 a specific MCS table, and determine the 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) The MCS table designated / set for CP-OFDM. (2) The MCS table designated / set for DFT-s-OFDM. (3) Either the CP-OFDM MCS table or the DFT-s-OFDM MCS table is preset by upper layer signaling.

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

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

[0078] [Aspect 3-3] The UE determines the indicated rank / layer from the precoding information and number of layers field of the DCI. Then, if rank 1 (single layer) is indicated, the UE may use DFT-s-OFDM for the PUSCH, and in other cases (i.e., when multi-layers are indicated), the UE may use CP-OFDM for the PUSCH. In other words, the UE may apply CP-OFDM to the PUSCH when multi-layers are indicated, and apply DFT-s-OFDM to the PUSCH in other cases. That is, the UE determines the waveform to be used for the 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 apply CP-OFDM to the PUSCH in other cases. 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 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 the 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 specification, different "precoding information and number of layers" tables are specified for CP-OFDM and DFT-s-OFDM. In this aspect, the UE first selects one table (the table for CP-OFDM or DFT-s-OFDM), and then selects DFT-s-OFDM or CP-OFDM according to the number of layers.

[0082] When dynamic switching of waveforms is set, 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 set and CP-OFDM when rank 2 is set. Even in this case, the waveform may be indicated assuming it is for CP-OFDM (using the "precoding information and number of layers" table when the transform precoder is invalid).

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

[0085] FIG. 7 is a diagram showing the "precoding information and number of layers" table when the transform precoder is effective in 3GPP Rel.16. In the table of FIG. 7, since it is 1 layer in all cases, the UE applies DFT-s-OFDM according to the DCI instruction.

[0086] [[Modification Example 1]] When the dynamic switching of waveforms (CP-OFDM / DFT-s-OFDM) is set by upper layer signaling, a new "precoding information and number of layers" table may be applied. When the dynamic switching of waveforms is set, the number of bits 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 the dynamic switching of waveforms is set. FIG. 8 is a table in which a new field (column) is added to the example of FIG. 6. An instruction of the waveform (CP-OFDM / DFT-s-OFDM) may be set / stipulated in this new field. The instruction of the waveform may be set for each index or for a plurality of indices. The instruction of the waveform may be information indicating activation / deactivation of the transform precoder.

[0088] The new table such as FIG. 8 may be defined separately from the existing table such as FIG. 6. And the UE may use the new table when the dynamic switching of waveforms is set by upper layer signaling, and use the existing table when it is not set.

[0089] The new table as shown in FIG. 8 may be a table obtained by performing an update to add new fields to the existing table as shown in FIG. 6. And when the dynamic switching of waveforms is set by upper layer signaling, the UE determines the waveform by referring to the waveform indication in the new field. When the dynamic switching of waveforms is not set, the UE may determine that the transform precoder is invalid (CP-OFDM).

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

[0091] When the transmission configuration information (txConfig) is set in the PUSCH configuration (PUSCH-Config) (that is, 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" field in the case of codebook MIMO, or the SRI field in the case of non-codebook MIMO.

[0092] When the transmission configuration information (txConfig) is not set in the PUSCH configuration (PUSCH-Config) (that is, when UL MIMO is not set), 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. When the PUSCH and the DMRS are FDM, the UE may use the CP-OFDM waveform for the PUSCH, and when the PUSCH and the DMRS are not FDM, the UE may use the DFT-s-OFDM waveform for the PUSCH. That is, the UE may determine the waveform used for the PUSCH based on the antenna port field of the DCI.

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

[0095] FIG. 9 is a table corresponding to the antenna port field when the transform precoder is invalid in Rel. 16. When the antenna port field (Value) is 0 or 1, since the "number of DMRS CDM group(s) without data" is 1, the UE determines that the PUSCH and the DMRS are FDM 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 valid in 3GPP Rel.16. In the example of Figure 10, since all of "number of DMRS CDM group(s) without data" are 2 (not 1), the UE determines that PUSCH and DMRS are not frequency-division multiplexed (FDM) regardless of the value of the antenna port field, and decides to use DFT-s-OFDM. That is, in the existing specification, FDM between PUSCH and DMRS is only permitted for CP-OFDM.

[0097] Note that the UE may first select one table (for example, the table corresponding to CP-OFDM), and then select DFT-s-OFDM or CP-OFDM according to "number of DMRS CDM group(s) without data". When dynamic switching of waveforms is set, 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, "number of DMRS CDM group(s) without data" dynamically indicates whether PUSCH and DMRS are FDM. When DFT-s-OFDM is used, PUSCH and DMRS are not always FDM.

[0099] Figure 11 is a diagram showing the PUSCH resource configuration when PUSCH and DMRS are FDM. Figure 11 is applicable, for example, when "number of DMRS CDM group(s) without data" is 1 in DMRS type 1. In Figure 11, PUSCH is arranged in the resources between a plurality of DMRS in the frequency direction. That is, PUSCH and DMRS are FDM. In this case, the UE uses CP-OFDM.

[0100] FIG. 12 is a diagram showing the PUSCH resource configuration when PUSCH and DMRS are not FDM. FIG. 12 is applicable, for example, when "number of DMRS CDM group(s) without data" is 2 in DMRS type 1. In FIG. 12, signals / channels are not arranged (not used) in the resources between a plurality of DMRSs in the frequency direction. That is, PUSCH and DMRS are not FDM. In this case, the UE uses DFT-s-OFDM.

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

[0102] <Fourth Embodiment> When waveform switching using DCI / MAC CE is set (regardless of whether it is implicit / explicit), a waveform switching delay may be introduced. The UE uses / determines (sets) a second period in which the minimum value of K2 (the period from DCI reception to PUSCH transmission) is longer than the first period when dynamic waveform switching is not performed, for dynamic waveform switching. When the UE receives an instruction indicating invalidation or activation of the transform precoder for PUSCH by DCI / MAC CE, the UE may apply the second period as the period from DCI reception to PUSCH transmission.

[0103] When dynamic switching of the waveform is set (e.g., by upper layer signaling), the K2 value may correspond to at least one of the definition of the specification, the setting by upper layer signaling, and the reported UE capabilities. In this case, regardless of whether the dynamic switching of the waveform is indicated by DCI / MAC CE, a K2 value longer than the existing value may be applied.

[0104] When the DCI / MAC CE indicates the waveform switching of the PUSCH, the K2 value may correspond to at least one of the definition in the specification, the setting by upper layer signaling, and the reported UE capabilities. Also, only when the dynamic switching of the waveform is indicated by the DCI / MAC CE, a K2 value longer than the existing value may be applied.

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

[0106] Figure 13A is a diagram showing an example of setting the minimum value of K2 for each SCS. K2_X in Figure 13A is a value considering the dynamic switching of the waveform and is the SCS (kHz). Figure 13B is a diagram showing an example 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 to consider the dynamic switching of the waveform.

[0107] [PUSCH Scheduling by the Base Station] When the UE is scheduled for PUSCH by the base station (gNB), the UE receives a DCI including a time domain resource assignment (TDRA) corresponding to the minimum K2 value. Also, the UE receives, by upper layer signaling / MAC CE / DCI, a value (hereinafter referred to as the additional value) that is a value considering the dynamic switching of the waveform and is added to the TDRA. The UE uses, as the delay period considering the dynamic switching of the waveform (the period from the reception of the DCI to the transmission of the PUSCH), the value obtained by adding the additional value to the TDRA.

[0108] When multiple minimum K2 values are specified, it may not be preferable to apply the TDRA table directly. This is because some TDRA values may be smaller than the K2 values considering dynamic waveform switching. Therefore, when dynamic waveform switching is set (or only when the DCI format indicates waveform switching for PUSCH), additional symbol / slot values may be added to the time domain resources indicated by TDRA. If the additional value for dynamic waveform switching is set by RRC and the sum of K2 and the additional value is smaller than a predetermined value, the additional value may be made invalid.

[0109] For example, a new RRC parameter (e.g., dynamicWaveformSwitching) may be set, and an additional value may be set according to this parameter. Existing UEs (e.g., Rel.15 / 16) are not instructed with the new RRC parameter and do not perform dynamic waveform switching, so the additional value may not be added.

[0110] When dynamic waveform switching is set and the UE's K2 value is determined by the RRC parameter minimumSchedulingOffsetK2, if the UE has not received the "Minimum applicable scheduling offset indicator" field in DCI format 0_1 or 1_1, the UE may apply the limit of the minimum scheduling offset of the additional value (or default value). In the existing system, the UE sets the additional value to 0.

[0111] The additional value of K2 (X symbols / slots) may be the same or different according to the SCS. The additional value may be a fixed value defined for each SCS, may be defined in the specification, or may be set by upper layer signaling. If the additional value is absent, the UE may use 0 as the additional value or use a predetermined value (default value).

[0112] If the additional value is included in an information element that does not depend on the BWP configuration (e.g., "MAC-CellGroupConfig"), it may be configured for each SCS. If it is included in an information element that depends on the BWP configuration (e.g., "PUSCH-Config"), since the SCS is determined according to the information element, it may not be necessary to configure it for each SCS. The unit of the additional value may be a subframe, and in this case, it is not necessary to configure it for each SCS.

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

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

[0115] When dynamic waveform switching is configured (or only when the DCI format indicates waveform switching for PUSCH), if the UE has a scheduled PUSCH where K2 (indicated by TDRA) + additional value (if configured) is smaller than the minimum value of K2 at the time of dynamic waveform switching indication, the UE may not transmit (or may drop) the PUSCH. Note that whether the DCI format indicates waveform switching for PUSCH may be unclear due to the failure of DCI transmission (the recognition between the base station and the UE is different). Therefore, the UE may perform the above processing when dynamic waveform switching is configured (regardless of whether there is waveform switching by DCI).

[0116] [[Others]] When dynamic waveform switching of PUSCH is performed by MAC CE signaling, after receiving an indication by MAC CE, the UE may switch the waveform after a predetermined time (e.g., 3 ms) for transmitting an ACK for a PDSCH including the MAC CE. After receiving a 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 a mismatch in waveform recognition between the base station and the UE due to a 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 a 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 a transform precoder). (2) Whether DCI / MAC CE can switch waveforms (transform precoders). (3) DCI formats 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 / higher layer signaling (e.g., RRC), etc., and perform the process in the present disclosure when the information is received. 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) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0121] FIG. 16 is a diagram showing an example of the 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), 5th generation mobile communication system New Radio (5G NR), etc., which are standardized by the Third Generation Partnership Project (3GPP).

[0122] Further, the wireless communication system 1 may support dual connectivity (multi-RAT dual connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). 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)), and the like.

[0123] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0124] The wireless communication system 1 may support dual connectivity between a plurality of base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both the MN and the SN are base stations (gNBs) of NR).

[0125] The wireless communication system 1 may include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to the modes shown in the figures. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0126] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[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 higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0128] Also, the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0129] The plurality of base stations 10 may be connected by wire (for example, an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper-level 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 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

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

[0132] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0133] The wireless access method may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the wireless access methods of the UL and the DL.

[0134] In the wireless communication system 1, as downlink channels, a physical downlink shared channel (PDSCH) shared by each user terminal 20, a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), etc. may be used.

[0135] Also, in the wireless communication system 1, as uplink channels, a physical uplink shared channel (PUSCH) shared by each user terminal 20, a physical uplink control channel (PUCCH), a physical random access channel (PRACH), etc. may be used.

[0136] The PDSCH is used to transmit user data, upper layer control information, System Information Block (SIB), etc. The PUSCH may be used to transmit user data, upper layer control information, etc. Also, the PBCH may be used to transmit the Master Information Block (MIB).

[0137] The PDCCH may be used to transmit lower layer control information. 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 called DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called UL grant, UL DCI, etc. Note that the PDSCH may be reconfigured with DL data, and the PUSCH may be reconfigured with UL data.

[0139] For the detection of the PDCCH, a control resource set (CORESET) and a search space may be used. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0140] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be read interchangeably with each other.

[0141] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be referred to as, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for connection establishment with a cell may be transmitted by PRACH.

[0142] Note that in the present disclosure, downlink, uplink, etc. may be expressed without adding "link". Also, "physical" may be omitted at the beginning of various channels.

[0143] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may be transmitted.

[0144] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0145] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0146] (Base station) FIG. 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 transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0147] In this example, the functional blocks of the characteristic portions in 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 processes of each unit described below may be omitted.

[0148] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0149] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc., using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal, and transfer it to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0150] The transmission / reception 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 transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0151] The transmitting and receiving unit 120 may be configured as an integrated transmitting and 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 composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0153] The transmitting and receiving unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0154] The transmitting and receiving unit 120 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0155] The transmitting and receiving unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit sequence to be transmitted.

[0156] The transceiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0157] The transceiver 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 transceiver antenna 130.

[0158] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0159] The transceiver unit 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 on the acquired baseband signal, and acquire user data, etc.

[0160] The transmission / reception unit 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) with devices included in the core network 30, other base stations 10, etc., and acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0162] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0163] Note that the transmission / reception unit 120 may transmit an instruction indicating invalidation or validation of the transform precoder for the Physical Uplink Shared Channel (PUSCH) by at least one of Downlink Control Information (DCI) and Medium Access Control Control Element (MAC CE). The control unit 110 may assume that the waveform used for the PUSCH is switched based on the instruction.

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

[0165] When switching by at least one of the DCI and the MAC CE of the transform precoder for the PUSCH is set, the size of the larger one of the size of the DCI field when the transform precoder is invalid and the size of the DCI field when the transform precoder is valid is determined for each DCI field, and the total size of the DCI format may be the total value of the size of the larger one in all DCI fields.

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

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

[0168] The transmission / reception unit 120 may transmit a setting indicating that the conversion precoder for the Physical Downlink Shared Channel (PUSCH) is dynamically switched between invalidation and validation by at least one of Downlink Control Information (DCI) and Medium Access Control Control Element (MAC CE). The control unit 110 may assume that a second period longer than the first period when the waveform is not switched is used as the period from the reception of the DCI to the transmission of the PUSCH.

[0169] (User Equipment) FIG. 18 is a diagram showing an example of the configuration of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided.

[0170] Note that in this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and the user equipment 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0171] The control unit 210 controls the entire user equipment 20. The control unit 210 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0172] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transmission / reception unit 220.

[0173] The transmission / reception 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 transmission / reception unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0174] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222. The reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0175] The transmission / reception antenna 230 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0176] The transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0177] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0178] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 210, and generate a bit sequence to be transmitted.

[0179] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel encoding (which may include error correction encoding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0180] Note that whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above transmission processing to transmit the channel using the DFT-s-OFDM waveform; otherwise, it may not perform DFT processing as the above transmission processing.

[0181] The transmission / reception unit 220 (RF unit 222) may perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230.

[0182] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to the baseband signal, etc. on the signal in the radio frequency band received by the transmission / reception antenna 230.

[0183] The transmission / reception unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the acquired baseband signal, and acquire user data, etc.

[0184] The transmission / reception unit 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0185] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0186] Note that the transmission / reception unit 220 may receive an instruction indicating invalidation or validation of the transform precoder for the Physical Uplink Shared Channel (PUSCH) by at least one of Downlink Control Information (DCI) and Medium Access Control Control Element (MAC CE). The control unit 210 may switch the waveform used for the PUSCH based on the instruction.

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

[0188] When switching by at least one of the DCI and the MAC CE of the transform precoder for the PUSCH is set, the larger size of the size of the DCI field when the transform precoder is invalid and the size of the DCI field when the transform precoder is valid is determined for each DCI field, and the total size of the DCI format may be the total value of the larger sizes in all DCI fields.

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

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

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

[0192] Based on the precoding information and layer number field, the controller 210 determines the indicated layer. When a single layer is indicated, the controller 210 may use the DFT-s-OFDM waveform for the PUSCH, and when multiple layers are indicated, the CP-OFDM waveform may be used.

[0193] Based on the antenna port field, the controller 210 determines whether the PUSCH and the demodulation reference signal (DMRS) are frequency division multiplexed (FDM). When the PUSCH and the DMRS are FDM, the controller 210 may use the CP-OFDM waveform for the PUSCH, and when the PUSCH and the DMRS are not FDM, the controller 210 may use the DFT-s-OFDM waveform for the PUSCH.

[0194] The transmission / reception unit 220 may receive a setting indicating dynamic switching of the activation or deactivation of the transform precoder for the Physical Uplink Shared Channel (PUSCH) by at least one of Downlink Control Information (DCI) and Medium Access Control Control Element (MAC CE). The control unit 210 may use a second period that is longer than a first period when the waveform is not switched as the period from the reception of the DCI to the transmission of the PUSCH.

[0195] The transmission / reception unit 220 may receive an instruction indicating the activation or deactivation of the transform precoder for the PUSCH by 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 the period from the reception of the DCI to the transmission of the PUSCH.

[0196] The transmission / reception unit 220 may receive DCI including Time Domain Resource Allocation (TDRA) and receive a value to be added to the TDRA. The control unit 210 may use, as the second period, a value obtained by adding the value to the TDRA. The second period may vary according to the Subcarrier Spacing (SCS).

[0197] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show functional unit blocks. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or may be realized using two or more physically or logically separated devices directly or indirectly (for example, using wired, wireless, etc.) connected, and using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0198] Here, functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the implementation method is not particularly limited.

[0199] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 19 is a diagram showing 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 physically be 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, and the like.

[0200] Note that in the present disclosure, terms such as device, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0201] For example, although only one processor 1001 is shown in the figure, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the 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 causing a predetermined software (program) to be loaded onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communication via a communication device 1004, or controls at least one of reading and writing data in the memory 1002 and a storage 1003.

[0203] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

[0204] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may be true for other functional blocks.

[0205] Memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other appropriate storage media. Memory 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. Memory 1002 can store a program (program code), a software module, etc. executable for implementing the 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 (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. Storage 1003 may be referred to as an auxiliary storage device.

[0207] The communication device 1004 is hardware (a transceiver device) for performing communication 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, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated and implemented by a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0208] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0209] Also, 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 for each device.

[0210] In addition, 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), and a Field Programmable Gate Array (FPGA), and some or all of the functional blocks may be implemented using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0211] (Modification example) In addition, with regard to the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be referred to as a Pilot, a pilot signal, etc. depending on the applicable standard. In addition, a Component Carrier (CC) may be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0212] A radio frame may be composed of one or a plurality of periods (frames) in the time domain. Each of the one or a plurality of periods (frames) constituting the radio frame may be referred to as a subframe. Furthermore, a subframe may be composed of one or a plurality of slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0213] Here, the new numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The new numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, and the like.

[0214] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on the new numerology.

[0215] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0216] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. For a radio frame, sub-frame, slot, mini-slot, and symbol, other corresponding names may be used. Note that the time units such as frames, sub-frames, slots, mini-slots, and symbols in this disclosure may be read interchangeably with each other.

[0217] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or may be a period shorter than 1 ms (for example, 1 - 13 symbols), or may be a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0218] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used at each user terminal) to each user terminal in units of TTI. Note that the definition of the TTI is not limited to this.

[0219] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0220] In addition, when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0221] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0222] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and equal to or more than 1 ms.

[0223] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0224] In addition, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0225] Note that one or more RBs may be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0226] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0227] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0228] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be set within one carrier.

[0229] At least one of the set BWPs may be active, and it may not be assumed that the UE transmits and receives a predetermined signal / channel outside the active BWP. Note that in the present disclosure, "cell", "carrier", etc. may be read as "BWP".

[0230] Note that the structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0231] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0232] The names used for parameters, etc. in the present disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0233] The information, signals, etc. described in the present disclosure may be represented using any of various 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 voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0234] Also, information, signals, etc. may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0235] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0236] The notification of information is not limited to the aspects / embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or combinations thereof.

[0237] Note that physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, RRC signaling may also be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, MAC signaling may be notified, for example, using a MAC Control Element (CE).

[0238] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0239] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (e.g., comparison with a predetermined value).

[0240] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by some other name.

[0241] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0242] The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[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", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. may be used interchangeably.

[0244] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station 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 entire coverage area of the base station can be divided into multiple smaller areas, and each of these smaller areas can also provide communication services 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 whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

[0246] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0247] A mobile station may also be called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other appropriate term.

[0248] At least one of the base station and the mobile station may also be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, a self-driving car, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0249] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between a base station and a user terminal is replaced by communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to communication between terminals (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be replaced with a sidelink channel.

[0250] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured to be functions of the base station 10.

[0251] In the present disclosure, operations assumed to be performed by a base station may in some cases be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0252] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0253] Each aspect / embodiment described in the present disclosure may be applicable to systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x is, for example, an integer or 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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended based on these. Further, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applicable.

[0254] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0255] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any form.

[0256] The term "determining" as used in this disclosure may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database or another data structure), "ascertaining", etc.

[0257] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in a memory), etc.

[0258] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be making some kind of operation.

[0259] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0260] The "maximum transmit power" described in the present disclosure may mean the maximum value of the transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0261] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements "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 "accessed".

[0262] In the present disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and also, as some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency region, microwave region, optical (both visible and invisible) region, etc.

[0263] In the present disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "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] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0265] In the present disclosure, for example, when articles are added by translation, as in the case of a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0266] As described above, the invention according to the present disclosure has been described in detail. However, it is obvious 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 changed forms without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiving unit that receives an instruction indicating inactivation or activation of a transform precoder for a physical uplink shared channel (PUSCH) by downlink control information (DCI), A control unit that determines inactivation or activation of the transform precoder for the PUSCH based on the instruction, and having, The size of each field in the DCI is the larger of the size when the transform precoder is inactive and the size when the transform precoder is active, a terminal.

2. A step of receiving an instruction indicating inactivation or activation of a transform precoder for a physical uplink shared channel (PUSCH) by downlink control information (DCI), A step of determining inactivation or activation of the transform precoder for the PUSCH based on the instruction, and having, The size of each field in the DCI is the larger of the size when the transform precoder is inactive and the size when the transform precoder is active, a wireless communication method for a terminal.

3. A transmitting unit that transmits an instruction indicating inactivation or activation of a transform precoder for a physical uplink shared channel (PUSCH) by downlink control information (DCI), A control unit that determines inactivation or activation of the transform precoder for the PUSCH based on the instruction, and having, The size of each field in the DCI is the larger of the size when the transform precoder is inactive and the size when the transform precoder is active, a base station.

4. A system having a terminal and a base station, The terminal is A receiving unit that receives an instruction indicating inactivation or activation of a transform precoder for a physical uplink shared channel (PUSCH) by downlink control information (DCI), A control unit that determines inactivation or activation of the transform precoder for the PUSCH based on the instruction, and having, The base station is A transmitting unit that transmits the DCI, having, The size of each field in the DCI is the larger of the size when the transform precoder is inactive and the size when the transform precoder is active, a system.

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