Apparatus and method for dynamic waveform switching in a wireless communication system

Abstract

According to various embodiments of the present disclosure, a method for operating a terminal (user equipment, UE) in a wireless communication system includes the steps of: receiving, from a base station (BS), downlink control information (DCI) associated with a dynamic instruction for one of a first waveform or a second waveform; determining, for each field in the DCI, a bit width of the field as a maximum value of the first bit width and the second bit width when a first bit width for the first waveform and a second bit width for the second waveform are different; decoding, for each field when the first waveform is indicated by the DCI and the second bit width is determined, only a number of least significant bits (LSBs) corresponding to the first bit width; and performing uplink transmission based on the determined waveform. A method is provided.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE This disclosure relates to wireless communication systems, and more particularly to an apparatus and method for dynamic waveform switching in wireless communication systems. [Background technology]

[0002] As more communication devices require greater communication capacity, there is a growing need for improved mobile broadband communication compared to existing radio access technologies. Massive Machine Type Communications (MTC), which connects multiple devices and objects to provide a variety of services anytime, anywhere, is also a key issue being considered for next-generation communications. Furthermore, communication system designs that take into account reliability- and latency-sensitive services / UEs are also being discussed. Thus, the introduction of next-generation radio access technologies that take into account enhanced mobile broadband communication, massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed, and for convenience, these technologies are referred to as NR in this specification. Summary of the Invention [Problem to be solved by the invention]

[0003] To address the aforementioned problems, the present disclosure provides an apparatus and method for dynamic waveform switching in a wireless communication system.

[0004] The technical problems to be achieved in this specification are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0005] To address the aforementioned problems, the present disclosure provides an apparatus and method for dynamic waveform switching in a wireless communication system.

[0006] The technical problems to be achieved in this specification are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Effects of the Invention]

[0007] To address the aforementioned problems, the present disclosure can provide an apparatus and method for dynamic waveform switching in a wireless communication system. [Brief explanation of the drawings]

[0008] The following accompanying drawings are intended to facilitate understanding of the present disclosure and, together with the detailed description, can provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to the specific drawings, and the features disclosed in each drawing can be combined with each other to form a new embodiment. Reference numerals in each drawing can refer to structural elements. [Figure 1] FIG. 1 is a diagram showing an example of physical channels used in a system applicable to the present disclosure and a general signal transmission method using these channels. [Figure 2] FIG. 1 is a diagram illustrating an example of a radio frame structure used in a system applicable to the present disclosure. [Figure 3] FIG. 1 illustrates an example of a slot structure used in a system applicable to the present disclosure. [Figure 4] FIG. 1 is a diagram illustrating an example of a slot structure of a radio frame used in a system applicable to the present disclosure. [Figure 5]FIG. 10 is a diagram illustrating an example of an operation process of a terminal in a system applicable to the present disclosure. [Figure 6] FIG. 10 is a diagram illustrating an example of the operation process of a base station in a system applicable to the present disclosure. [Figure 7] FIG. 2 is a diagram illustrating an example of the structure of a first device and a second device in a system applicable to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] In various embodiments of the present disclosure, "A or B" can mean "A only," "B only," or "both A and B." In other words, in various embodiments of the present disclosure, "A or B" can be interpreted as "A and / or B." For example, in various embodiments of the present disclosure, "A, B, or C" can mean "A only," "B only," "C only," or "any combination of A, B, and C."

[0010] A slash ( / ) or a comma used in various embodiments of the present disclosure can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "A only," "B only," or "both A and B." For example, "A,B,C" can mean "A, B, or C."

[0011] In various embodiments of the present disclosure, "at least one of A and B" can mean "A only," "B only," or "both A and B." Also, in various embodiments of the present disclosure, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted similarly to "at least one of A and B."

[0012] Furthermore, in various embodiments of the present disclosure, "at least one of A, B, and C" can mean "A only," "B only," "C only," or "any combination of A, B, and C." Furthermore, "at least one of A, B, or C" or "at least one of A, B, and / or C" can mean "at least one of A, B, and C."

[0013] Furthermore, parentheses used in various embodiments of the present disclosure may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" may be proposed as an example of "control information." In other words, "control information" in various embodiments of the present disclosure is not limited to "PDCCH," and "PDCCH" may be proposed as an example of "control information." Furthermore, when "control information (i.e., PDCCH)" is used, "PDCCH" may be proposed as an example of "control information."

[0014] In various embodiments of the present disclosure, technical features individually described in one drawing may be realized individually or simultaneously.

[0015] [General signal transmission method in 3GPP (registered trademark: the same applies below)]

[0016] Physical Channels and General Signaling

[0017] 1 is a diagram illustrating an example of physical channels used in a system applicable to the present disclosure and a general signal transmission method using the channels. Specifically, FIG. 1 illustrates physical channels used in a 3GPP system and general signal transmission.

[0018] 1 illustrates physical channels and general signal transmission used in a 3GPP system. In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and transmits information to the base station via an uplink (UL). Information exchanged between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type / use of the information exchanged.

[0019] When a terminal is powered on after being powered off or newly enters a cell, it performs an initial cell search operation, such as synchronizing with a base station (S11). To this end, the terminal receives a Primary Synchronization Channel (PSCH) and a Secondary Synchronization Channel (SSCH) from the base station to synchronize with the base station and acquire information such as a cell identity (ID). The terminal can also receive a Physical Broadcast Channel (PBCH) from the base station to acquire broadcast information within the cell. The terminal can also receive a Downlink Reference Signal (DL RS) during the initial cell search step to check the downlink channel status.

[0020] After completing the initial cell search, the terminal receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) corresponding to the PDCCH to obtain more specific system information (S12).

[0021] Thereafter, the terminal performs a random access procedure to complete connection to the base station (S13 to S16). Specifically, the terminal transmits a preamble over a physical random access channel (PRACH) (S13) and receives a random access response (RAR) for the preamble over a PDCCH and a corresponding PDSCH (S14). Thereafter, the terminal transmits a physical uplink shared channel (PUSCH) using scheduling information in the RAR (S15) and performs a contention resolution procedure for the PDCCH and the corresponding PDSCH (S16).

[0022] After performing the above-described procedures, the UE then performs PDCCH / PDSCH reception (S17) and PUSCH / PUCCH (Physical Uplink Control Channel) transmission (S18) as a general uplink / downlink signal transmission procedure. Control information transmitted by the UE to the base station is called UCI (Uplink Control Information). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted via PUCCH, but may be transmitted via PUSCH if control information and data must be transmitted simultaneously. Furthermore, the UE may aperiodically transmit UCI via PUSCH according to a request / instruction from the network.

[0023] [OFDM (Orthogonal Frequency Division Multiplexing) Numerology]

[0024] The new RAT system may use an OFDM transmission scheme or a similar transmission scheme. The new RAT system may follow different OFDM parameters from those of LTE. Alternatively, the new RAT system may follow the existing LTE / LTE-A numerology but have a larger system bandwidth (e.g., 100 MHz). Alternatively, one cell may support multiple numerologies. That is, UEs operating with different numerologies may coexist within one cell.

[0025] [Radio frame structure]

[0026] FIG. 2 is a diagram showing an example of a structure of a radio frame used in a system applicable to the present disclosure.

[0027] In NR, uplink and downlink transmissions are organized into frames. A radio frame has a length of 10 ms and is defined by two 5 ms half-frames (Half-Frames, HF). A half-frame is defined by five 1 ms subframes (Subframes, SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). When a normal CP is used, each slot contains 14 symbols. When an extended CP is used, each slot contains 12 symbols. Here, a symbol may include an OFDM symbol (or a CP-OFDM symbol) or an SC-FDMA symbol (or a DFT-s-OFDM symbol).

[0028] Table 1 illustrates that when a normal CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0029] [Table 1]

[0030] N slot symb is the number of symbols in the slot. N frame,u slot is the number of slots in the frame. subframe,u slot is the number of slots in a subframe.

[0031] Table 2 illustrates that when an extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0032] [Table 2]

[0033] NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, a 15 kHz SCS supports wide areas in traditional cellular bands, a 30 kHz / 60 kHz SCS supports dense urban areas, lower latency, and wider carrier bandwidths, and a 60 kHz or higher SCS supports bandwidths greater than 24.25 GHz to overcome phase noise.

[0034] The NR frequency band can be defined as two types of frequency ranges (FR1 and FR2). The values ​​of the frequency ranges may be changed. For example, the two types of frequency ranges (FR1 and FR2) are shown in Table 3 below. For convenience of explanation, among the frequency ranges used in the NR system, FR1 means the "sub 6 GHz range" and FR2 means the "above 6 GHz range," and they may also be called millimeter wave (mmW).

[0035] [Table 3]

[0036] As mentioned above, the numerical values ​​of the frequency ranges of the NR system may be changed. For example, FR1 may include the band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 may include unlicensed bands. Unlicensed bands can be used for various purposes, such as communications for vehicles (e.g., autonomous driving).

[0037] [Table 4]

[0038] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set differently among multiple cells merged into one terminal, and thus the (absolute time) duration of time resources (e.g., SF, slot, or TTI) (commonly referred to as TU (Time Unit) for convenience) consisting of the same number of symbols can be set differently among the merged cells.

[0039] FIG. 3 is a diagram illustrating an example of a slot structure used in a system applicable to the present disclosure.

[0040] A slot contains multiple symbols in the time domain. For example, in the case of a normal CP, one slot contains seven symbols, while in the case of an extended CP, one slot contains six symbols. A carrier contains multiple subcarriers in the frequency domain. A resource block (RB) is defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined by multiple (P) consecutive RBs in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier may contain up to N (e.g., 5) BWPs. Data communication is performed via activated BWPs, and only one BWP can be activated for one terminal. Each element in the resource grid is called a resource element (RE), and one complex symbol can be mapped to it.

[0041] FIG. 4 is a diagram showing an example of a slot structure of a radio frame used in a system applicable to the present disclosure.

[0042] FIG. 4 illustrates the slot structure of a frame for an NR system as an exemplary system.

[0043] The NR frame structure is characterized by a self-contained structure in which a DL control channel, DL or UL data, and a UL control channel can all be included in one slot unit, as shown in the example of FIG. 4. In this case, DL data scheduling information, UL data scheduling information, etc. can be transmitted in the DL control channel, and ACK / NACK information for DL ​​data, CSI information (modulation and coding scheme information, MIMO transmission related information, etc.), scheduling request, etc. can be transmitted in the UL control channel. In FIG. 4, a time gap for DL-to-UL or UL-to-DL switching may exist between the control region and the data region. In addition, some of the DL control / DL data / UL data / UL control may not be configured in one slot. Alternatively, the order of the channels configuring one slot may be different (e.g., DL control / DL data / UL control / UL data or UL control / UL data / DL control / DL data, etc.).

[0044] Composition and Method of the Invention

[0045] Currently, in NR, it is defined that the base station indicates which waveform to use between CP-OFDM and DFT-s-OFDM via RRC signaling (e.g., SIB1, UE-specific RRC signaling, etc.).

[0046] To explain the contents defined in 3GPP TS 38.331 in more detail, in the 4-step RACH procedure, the waveform of Msg.3 PUSCH is defined to use DFT-s-OFDM as the UL waveform when 'msg3-transformPrecoder' is instructed to be enabled, and to use CP-OFDM as the UL waveform when the 'msg3-transformPrecoder' parameter field is empty. On the other hand, in the 2-step RACH procedure, the waveform of Msg.A PUSCH is defined to use DFT-s-OFDM when 'msgA-TransformPrecoder' is instructed to be enabled, and to use CP-OFDM when it is instructed to be disabled.

[0047] Finally, the waveforms of other UL channels (e.g., normal PUSCH, configured PUSCH, etc.) other than the Msg.3 PUSCH and Msg.A PUSCH are defined to use DFT-s-OFDM when 'transformPrecoder' is enabled, and to use CP-OFDM when disabled. Furthermore, if the 'transformPrecoder' parameter is not specified separately, it is defined to follow the setting of 'msg3-transformPrecoder'.

[0048] In this specification, the expression that the base station sets / instructs the UL waveform to CP-OFDM has the same meaning as the values ​​of 'msg3-transformPrecoder' and / or 'msgA-TransformPrecoder' and / or 'transformPrecoder', which are parameters transmitted via RRC signaling (e.g., SIB1, UE specific RRC signaling, etc.), being set to disabled, and also has the same meaning as the value of 'transformPrecoder', which can be newly defined in DCI format 0_0, 0_1, 0_2, etc. (or the terminal can reinterpret and use an existing field) being set to disabled. On the other hand, the expression that the base station sets / instructs the UL waveform to DFT-s-OFDM has the same meaning as the 'msg3-transformPrecoder' and / or 'msgA-transformPrecoder' and / or 'transformPrecoder' values, which are parameters transmitted via RRC signaling (e.g., SIB1, UE specific RRC signaling, etc.), being set to enable, and also has the same meaning as the 'transformPrecoder' value, which can be newly defined for DCI formats 0_0, 0_1, 0_1, 0_2, etc. (or the terminal can reinterpret and use an existing field) being set to enable.

[0049] Meanwhile, when a dynamic waveform switching method is introduced, a method of setting / indicating a waveform via DCI is considered, and this specification proposes a newly considered method of proposing DCI design details.

[0050] Methods to consider when dynamically configuring waveforms via specific DCI fields:

[0051] The base station can use DCI formats 0_0, 0_1, and 0_2 for scheduling PUSCH to set / instruct dynamic waveform switching of PUSCH. Specifically, a new field can be created in the corresponding DCI and used to set / instruct dynamic waveform switching. However, since there may not be many reserved fields in the corresponding DCI, a specific DCI field that was previously used for other purposes can be reinterpreted as a field for setting / instructing dynamic waveform switching.

[0052] As an example, the most significant bit (MSB) (or least significant bit) N bits (e.g., N=1) of the TDRA (Time domain resource assignment) field, MCS (Modulation and coding scheme) field, Redundancy version field, and / or HARQ process number field, etc., can be set to be used for setting / instructing dynamic waveform switching.

[0053] Additionally, when the waveform is dynamically set / instructed to either CP-OFDM or DFT-s-OFDM via a specific position of a specific DCI field as described above, the following terminal operation can be additionally considered.

[0054] First, depending on the type of UL waveform dynamically set / instructed by the base station via a specific DCI field, the set of values ​​indicated by the specific DCI field or the table to which the values ​​indicated by the specific DCI field refer may be set / defined differently. For example, when the UL waveform is set / instructed to be CP-OFDM, the table to which the MCS field refers is Table X, and when the UL waveform is set / instructed to be DFT-s-OFDM, the table to which the MCS field refers is Table Y. As another example, the values / tables to be referenced for the set of beta offset values ​​and / or the set of power control parameters for each waveform may be set / defined independently. Alternatively, a beta offset value may be dynamically indicated via DCI for a specific waveform 1 as described above, while a semi-static beta offset may be configured / applied to be used for another waveform 2 without any dynamic instruction (i.e., 0 bit in DCI). As another example, a scaling factor (i.e., Alpha, α) that determines the maximum number of REs allowed for UCI mapping among the total number of REs in a PUSCH (e.g., Alpha value applied to a formula for determining the number of UCI REs, including the following Equation 1, included in TS 38.212 Section 6.3.2.4) may also be independently set / defined, with values / tables to be referenced for each waveform. Equation 1 is an Alpha-related formula included in 3GPP TS 38.212 Section 6.3.2.4.

[0055]

number

[0056] In this case, when the UL waveform is dynamically set / instructed via a specific DCI field A (e.g., HARQ process number field, etc.), the UE can be configured to interpret a specific DCI field B (e.g., MCS field, etc.) according to the set / instructed UL waveform value by referring to the value / table, etc. set for the corresponding UL waveform value.

[0057] As another example, the combination of information indicated by the TDRA field value can be configured to change depending on whether the UL waveform is DFT-s-OFDM or CP-OFDM. That is, the combination of {k2, mappingType, startSymbolAndLength} indicated by the TDRA field value can change depending on the DMRS structure compatible with different UL waveforms. Therefore, when the UL waveform is DFT-s-OFDM, it can be configured to refer to Table X configured with a combination of information compatible with the UL waveform, and when the UL waveform is CP-OFDM, it can be configured to refer to Table Y configured with a combination of information compatible with the UL waveform.

[0058] Second, a specific DCI field may be configured differently depending on the UL waveform dynamically configured / instructed by the base station via the specific DCI field. For example, if the UL waveform is configured / instructed to be CP-OFDM, the MCS field may be configured with X bits (e.g., X=5), whereas if the UL waveform is configured / instructed to be DFT-s-OFDM, the MCS field may be configured with Y bits (e.g., Y=4). Alternatively, if the UL waveform is configured / instructed to be CP-OFDM, the HARQ process number field may be configured with X bits (e.g., X=4), whereas if the UL waveform is configured / instructed to be DFT-s-OFDM, the HARQ process number field may be configured with Y bits (e.g., Y=2). In this case, when the UL waveform is dynamically configured / instructed via a specific DCI field A (e.g., HARQ process number field, etc.), when the UE interprets a specific DCI field B (e.g., MCS field, etc.) according to the configured / instructed UL waveform value, it can be configured to interpret using a pre-defined DCI field size according to the corresponding UL waveform value.

[0059] Furthermore, the field configuration (e.g., field bit-width) of the next DCI field may also change depending on the UL waveform set / instructed by the base station.

[0060] (1) SRI-related: SRS resource set indicator and / or Second SRS resource indicator

[0061] (1-1) Even if the UL waveform set / instructed by the base station changes, it is possible to consider a method of setting the bit width of the relevant field to be the same under constraints such as setting / instructing to use one of non-codebook (NCB) based transmission and codebook (CB) based transmission, or setting / instructing the number of SRS resources in common, or setting / instructing the number of max ranks in common.

[0062] (1-2) Alternatively, when the bit width of the corresponding field varies depending on the UL waveform, the maximum value of the possible bit widths can be set to determine the bit width of the corresponding field.

[0063] (2) TPMI (transmit precoding matrix indicator) and TRI (Transmit Rank Indicator) related: Precoding information and number of layers & Second Precoding information

[0064] (2-1) When the bit width of the corresponding field varies depending on the UL waveform, the bit width of the corresponding field can be set to the maximum value among the possible bit widths.

[0065] (3) Antenna ports field

[0066] (3-1) When the bit width of the corresponding field varies depending on the UL waveform, the bit width of the corresponding field can be set to be determined by the maximum value among the possible bit widths.

[0067] (4)DMRS sequence initialization field

[0068] (4-1) When a waveform is configured via the existing higher layer signaling, the field size is set to 0 bit when configured as DFT-s-OFDM, and set to 1 bit when configured as CP-OFDM. In addition, when dynamic waveform switching is configured, the field size is always set to 1 bit, and the terminal can be configured to determine whether to interpret the 1 bit depending on the UL waveform that is actually dynamically configured / instructed. That is, when the base station dynamically configures to DFT-s-OFDM, the terminal can be configured to ignore the 1-bit field, and when the base station dynamically configures to CP-OFDM, the terminal can be configured to interpret the 1-bit field without ignoring it.

[0069] (4-2) Alternatively, when dynamic waveform switching is configured, the corresponding field size can be set to always be fixed to 0 bits, and the initialization method for when the base station dynamically configures it to CP-OFDM can be set / instructed via higher layer signaling, or it can be fixed to a specific value of 0 or 1 in advance.

[0070] (5) PTRS-DMRS association (PTRS-DMRS association & Second PTRS-DMRS association)

[0071] (5-1) In existing methods, the number of bits can be set to 0, 2, or 4 depending on various conditions. Characteristically, if the UL waveform set / instructed via higher layer signaling is DFT-s-OFDM or if the max rank is 1, the corresponding field size becomes 0 bit. In addition, if dynamic waveform switching is set, the corresponding field size is always set to be fixed to 0 bit, and the association method for when the base station dynamically sets to CP-OFDM can be set / instructed via higher layer signaling, or can be fixed to a specific value in advance.

[0072] (5-2) Alternatively, when the bit width of the corresponding field varies depending on the UL waveform, the maximum value of the possible bit widths can be set to determine the bit width of the corresponding field.

[0073] Among the above setting methods, we have proposed a method of determining the bit width of the corresponding field with the maximum value of the possible bit widths when the bit width of the corresponding field changes depending on the UL waveform. In this case, if a UL waveform that requires only a relatively small bit width is dynamically set / instructed, the terminal can be set to interpret only the required number of bits from the MSB (or LSB) when interpreting the corresponding field (i.e., set to ignore unnecessary bits from the LSB (or MSB)).

[0074] On the other hand, if the field size is set to change as the waveform is dynamically changed, the field size can be determined by one of the following alternative methods.

[0075] (1) Alt1: A method of comparing the field size when the UL waveform is CP-OFDM and the field size when the UL waveform is DFT-s-OFDM for each field and determining the size of each field based on the larger value of the two.

[0076] (2) Alt2: A method of comparing the overall (or combined size of specific multiple fields) field size in the case where the UL waveform is CP - OFDM with the overall (or combined size of specific multiple fields) field size in the case of DFT - s - OFDM and determining the overall DCI field size (or the combined size of specific multiple fields) with the larger value of the two.

[0077] (2 - 1) For example, considering grouping fields A and B, when the UL waveform is set / indicated to DFT - s - OFDM, the field sizes are a1 / b1 respectively, and when the UL waveform is set / indicated to CP - OFDM, the field sizes are a2 / b2 respectively. The sum of the two field sizes can be defined as max{a1 + b1, a2 + b2}.

[0078] As another method, it can be considered to apply the existing DCI handling and / or terminal interpretation methods applied during BWP switching when the base station and the terminal set / indicate dynamic waveform switching. That is, in a situation where the size of a specific field X is A bits when it is a specific waveform 1 (e.g., CP - OFDM) and B bits when it is a specific waveform 2 (e.g., DFT - s - OFDM), when the base station instructs a dynamic switch from waveform 1 to waveform 2 via DCI, the size of field X in the corresponding DCI can be set to indicate waveform 2 - related information in a state where it is A bits.

[0079] At this time, if A > B, the terminal can be set to read only the first (MSB) B bits in field X and interpret / apply them as waveform 2 information. Conversely, if A < B, the terminal can be set to append B - A bits of '0' before the A bits indicated by field X and interpret / apply them as waveform 2 - related B - bit information.

[0080] Furthermore, enabling / disabling operation for dynamic waveform switching can be set independently for each BWP. For example, dynamic waveform switching may be enabled in the first active UL BWP and disabled in the second active UL BWP. In other words, while the base station can dynamically configure / instruct the UL waveform in the first active UL BWP, the base station cannot dynamically configure / instruct the UL waveform in the second active UL BWP and can configure / instruct the UL waveform using the existing method (i.e., semi-static configuration method via higher layer signaling).

[0081] For this operation, a higher layer parameter indicating whether dynamic waveform switching is enabled or disabled can be configured to be provided independently for each UL BWP (i.e., a corresponding higher layer parameter is generated / indicated for the number of UL BWPs configured by the base station). Characteristically, if the base station does not transmit the higher layer parameter for a specific UL BWP or transmits the higher layer parameter with the parameter left empty, the UE can be configured / defined to determine whether dynamic waveform switching is enabled or disabled in the corresponding UL BWP according to the information (i.e., one of enable / disable) set by the higher layer parameter provided in the initial UL BWP.

[0082] A specific DCI format (e.g., DCI format 0_2) is defined so that the size of each field constituting the corresponding DCI can be configured by the base station. For this reason, if an explicit N-bit (e.g., N=1) DCI field is introduced (in the corresponding specific DCI format (e.g., DCI format 0_2)) for dynamic waveform switching, a method can be considered in which the base station sets / defines (individually for each waveform) the size of a specific (identical) DCI field to have different (or the same) values ​​depending on the waveform. Thereafter, the terminal can be configured to calculate / interpret the size of a specific DCI field according to the information set / defined by the base station in accordance with the waveform set / instructed via the explicit N-bit DCI field and receive (monitor) DCI accordingly.

[0083] When this proposed method is applied, the base station sets / instructs each field size differently (or the same) according to different waveforms, so that even when different waveforms are set / instructed, the overall size of the corresponding specific DCI format can be made the same (or similar).As a result, even when different waveforms are applied, the overall DCI size becomes the same / similar, so there is an advantage that the terminal does not need to perform the new operation proposed earlier.In addition, there is an advantage that the DCI overhead can be reduced by reducing the difference in DCI payload size required between different waveforms.

[0084] A specific configuration method is proposed as follows. First, this method configures / defines (individually for each waveform) the sizes of all DCI fields (configurable by the base station) constituting a specific DCI format (e.g., DCI format 0_2) so that they can have independent (e.g., different or the same) sizes according to different waveforms. That is, the base station can configure / instruct the sizes of all DCI fields (configurable by the base station) of DCI format 0_2 to have independent (e.g., different or the same) values ​​according to different waveforms via higher layer signaling (e.g., UE-specific RRC signaling). The terminal then receives the corresponding information (the size of each DCI field corresponding to each waveform) and can select / interpret an appropriate DCI field size (set for the specified waveform) according to which waveform is dynamically instructed from the base station, and receive (monitor) the corresponding DCI. Characteristically, since different sizes can be configured / instructed according to all DCI fields, the amount of information provided by the base station may be large.

[0085] Second, among the DCI fields (configurable by the base station) constituting a specific DCI format (e.g., DCI formats 0_2), the sizes of certain DCI fields are set / defined (separately for each waveform) to have independent (e.g., different or the same) sizes according to different waveforms, and the sizes of the remaining DCI fields (e.g., used in common by two waveforms) are set / defined to be the same regardless of the waveform. That is, the base station can set / instruct the sizes of certain DCI fields of DCI formats 0_2 (separately for each waveform) to have independent (e.g., different or the same) values ​​according to different waveforms through higher layer signaling (e.g., UE-specific RRC signaling), and can set / instruct the sizes of the remaining DCI fields to have the same value regardless of the waveform. Thereafter, the terminal receives the corresponding information (DCI field size set individually for each waveform and / or DCI field size set the same regardless of waveform) and can be configured to select / interpret it as the appropriate DCI field size (set for the specified waveform) depending on which waveform is dynamically instructed from the base station and receive (monitor) the corresponding DCI.

[0086] [Method of setting / instructing a waveform to a value specified by a specific DCI field in advance]

[0087] As in the previously proposed method, the base station can dynamically set / indicate a waveform using a specific field in DCI formats 0_0, 0_1, and 0_2 for scheduling PUSCH, but a method of setting / indicating a specific waveform in a higher layer signaling value or table referenced by an existing defined DCI field value can also be considered.

[0088] As a first method, a base station can additionally configure / indicate a specific UL waveform in information corresponding to each TDRA (Time Domain Resource Assignment) field value configured / indicated by the base station through higher layer signaling. That is, the base station provides k2, mappingType, and startSymbolAndLength information corresponding to each TDRA field value through higher layer signaling, and can additionally configure / indicate a UL waveform to this. Characteristically, a default UL waveform can be configured, and if a separate UL waveform value is not provided, the default UL waveform can be followed. The default UL waveform may be a value configured by the base station in cell common through higher layer signaling, a value configured in BWP specific, or a value separately configured / indicated.

[0089] As a second method, a method of predefining UL waveform values ​​for a specific MCS table can be considered. For example, when a specific MCS table is newly configured, a specific index can be additionally specified as UL waveform A (e.g., CP-OFDM), and another specific index can be additionally specified as UL waveform B (e.g., DFT-s-OFDM).

[0090] As another method, a method of dividing the HARQ process number field values ​​into two groups in advance and pairing a UL waveform for each group in advance can be considered. For example, if the HARQ process number field is X bits and there are a total of 2X HARQ IDs, K HARQ IDs (e.g., 0 to K-1) can be defined to use UL waveform A (e.g., CP-OFDM), and 2X-K HARQ IDs (e.g., K to 2X-1) can be defined to use UL waveform B (e.g., DFT-s-OFDM). The UE can operate by transmitting a PUSCH using a UL waveform predefined according to the corresponding HARQ process number field value.

[0091] Alternatively, a method of mapping a UL waveform according to information corresponding to each index of the TDRA table (i.e., according to the result of resource mapping) can be considered. As an example, the UL waveform to be used can be pre-configured / defined according to how many OFDM symbols are allocated according to the startSymbolAndLength (i.e., SLIV) value, and / or whether the mapping type is type A or type B, and / or the k2 value (or a combination of the above values). The UE can know in advance the UL waveform to be used according to how the TDRA information is configured / indicated / combined, and when the base station actually configures a TDRA value via the DCI field, the UE can be configured to transmit the PUSCH using the corresponding UL waveform.

[0092] Alternatively, a method may be considered in which different UL waveforms are used depending on the number of PRBs set / indicated via the FDRA field and / or the code rate value set / indicated via the MCS field. For example, when a certain number of PRBs or less (predefined or set / indicated by the base station) are allocated and / or an MCS index of a certain code rate or less is set, the UE may be configured to use waveform A (e.g., DFT-s-OFDM). Conversely, when a certain number of PRBs or more are allocated and / or an MCS index of a certain code rate or more is set, the UE may be configured to use waveform B (e.g., CP-OFDM). The UE may check the set value of the FDRA field and / or the set value of the MCS field (or a combination of values ​​in the fields) and configure it to transmit the PUSCH using the corresponding UL waveform.

[0093] [Method of indicating via aggregation level and CCE index]

[0094] Furthermore, instead of dynamically configuring / indicating a waveform via a DCI field, it is also possible to dynamically configure / indicate a UL waveform using the aggregation level value and / or CCE index value of the PDCCH on which the UL grant is transmitted. That is, an aggregation level value (or a CCE index value) and a UL waveform are paired in advance, and when the base station uses a specific aggregation level (or a specific CCE index value), the UE can interpret that the UL waveform paired therewith is configured / indicated. For example, when aggregation levels 1, 2, and 4 are used, it can be defined that waveform A (e.g., CP-OFDM) is used, and when aggregation levels 8 and 16 are used, it can be defined that waveform B (e.g., DFT-S-OFDM) is used. As another example, if the (lowest or highest) CCE index is greater than or equal to K, or if the (lowest or highest) CCE index is an even number, waveform A (e.g., CP-OFDM) can be defined to be used, and if the (lowest or highest) CCE index is less than K, or if the (lowest or highest) CCE index is an odd number, waveform B (e.g., DFT-S-OFM) can be defined to be used.

[0095] [Method of determining whether to use dynamic waveform switching depending on the value of a specific DCI field]

[0096] A method may be considered in which the base station informs the terminal whether to use dynamic waveform switching using the value of a specific DCI field. As a first method, whether to use dynamic waveform switching may be determined depending on the value of the HARQ process number field and whether it is an initial transmission / retransmission. For example, dynamic waveform switching may not be used during initial transmission with a specific HARQ ID, and may be configured to be used when instructing retransmission with the same HARQ ID. The terminal may interpret the DCI field to understand that dynamic waveform switching is not used during initial transmission with a specific HARQ ID, and may be configured to interpret the DCI field to understand that dynamic waveform switching is used when instructing retransmission with the same HARQ ID.

[0097] In this case, when the UL waveform is dynamically set / instructed via a specific DCI field A (e.g., HARQ process number field, etc.), the UE can be configured to interpret a specific DCI field B (e.g., MCS field, etc.) according to the set / instructed UL waveform value by referring to the value / table, etc. set for the corresponding UL waveform value.

[0098] As another example, the combination of information indicated by the TDRA field value can be configured to change depending on whether the UL waveform is DFT-s-OFDM or CP-OFDM. That is, the combination of {k2, mappingType, startSymbolAndLength} indicated by the TDRA field value can change depending on the DMRS structure compatible with different UL waveforms. Therefore, when the UL waveform is DFT-s-OFDM, it can be configured to refer to Table X configured with a combination of information compatible with the UL waveform, and when the UL waveform is CP-OFDM, it can be configured to refer to Table Y configured with a combination of information compatible with the UL waveform.

[0099] Second, a specific DCI field may be configured differently depending on the UL waveform dynamically configured / instructed by the base station via the specific DCI field. For example, if the UL waveform is configured / instructed to be CP-OFDM, the MCS field may be configured with X bits (e.g., X=5), whereas if the UL waveform is configured / instructed to be DFT-s-OFDM, the MCS field may be configured with Y bits (e.g., Y=4). Alternatively, if the UL waveform is configured / instructed to be CP-OFDM, the HARQ process number field may be configured with X bits (e.g., X=4), whereas if the UL waveform is configured / instructed to be DFT-s-OFDM, the HARQ process number field may be configured with Y bits (e.g., Y=2). In this case, when the UL waveform is dynamically configured / instructed via a specific DCI field A (e.g., HARQ process number field, etc.), when the UE interprets a specific DCI field B (e.g., MCS field, etc.) according to the configured / instructed UL waveform value, it can be configured to interpret using a pre-defined DCI field size according to the corresponding UL waveform value.

[0100] Furthermore, the field configuration (e.g., field bit-width) of the next DCI field may also change depending on the UL waveform set / instructed by the base station.

[0101] (1) SRI-related: SRS resource set indicator and / or Second SRS resource indicator

[0102] (1-1) Even if the UL waveform set / instructed by the base station changes, it is possible to consider a method of setting the bit width of the relevant field to be the same under constraints such as setting / instructing to use one of non-codebook (NCB) based transmission and codebook (CB) based transmission, or setting / instructing the number of SRS resources in common, or setting / instructing the number of max ranks in common.

[0103] (1-2) Alternatively, when the bit width of the corresponding field varies depending on the UL waveform, the maximum value of the possible bit widths can be set to determine the bit width of the corresponding field.

[0104] (2) TPMI (transmit precoding matrix indicator) and TRI (Transmit Rank Indicator) related: Precoding information and number of layers & Second Precoding information

[0105] (2-1) When the bit width of the corresponding field varies depending on the UL waveform, the bit width of the corresponding field can be set to the maximum value among the possible bit widths.

[0106] (3) Antenna ports field

[0107] (3-1) When the bit width of the corresponding field varies depending on the UL waveform, the bit width of the corresponding field can be set to be determined by the maximum value among the possible bit widths.

[0108] (4)DMRS sequence initialization field

[0109] (4-1) When a waveform is configured via the existing higher layer signaling, the field size is set to 0 bit when configured as DFT-s-OFDM, and set to 1 bit when configured as CP-OFDM. In addition, when dynamic waveform switching is configured, the field size is always set to 1 bit, and the terminal can be configured to determine whether to interpret the 1 bit depending on the UL waveform that is actually dynamically configured / instructed. That is, when the base station dynamically configures to DFT-s-OFDM, the terminal can be configured to ignore the 1-bit field, and when the base station dynamically configures to CP-OFDM, the terminal can be configured to interpret the 1-bit field without ignoring it.

[0110] (4-2) Alternatively, when dynamic waveform switching is configured, the corresponding field size can be set to always be fixed to 0 bits, and the initialization method for when the base station dynamically configures it to CP-OFDM can be set / instructed via higher layer signaling, or it can be fixed to a specific value of 0 or 1 in advance.

[0111] (5) PTRS-DMRS association (PTRS-DMRS association & Second PTRS-DMRS association)

[0112] (5-1) In existing methods, the number of bits can be set to 0, 2, or 4 depending on various conditions. Characteristically, if the UL waveform set / instructed via higher layer signaling is DFT-s-OFDM or if the max rank is 1, the corresponding field size becomes 0 bit. In addition, if dynamic waveform switching is set, the corresponding field size is always set to be fixed to 0 bit, and the association method for when the base station dynamically sets to CP-OFDM can be set / instructed via higher layer signaling, or can be fixed to a specific value in advance.

[0113] (5-2) Alternatively, when the bit width of the corresponding field varies depending on the UL waveform, the maximum value of the possible bit widths can be set to determine the bit width of the corresponding field.

[0114] Among the above setting methods, we have proposed a method of determining the bit width of the corresponding field with the maximum value of the possible bit widths when the bit width of the corresponding field changes depending on the UL waveform. In this case, if a UL waveform that requires only a relatively small bit width is dynamically set / instructed, the terminal can be set to interpret only the required number of bits from the MSB (or LSB) when interpreting the corresponding field (i.e., set to ignore unnecessary bits from the LSB (or MSB)).

[0115] On the other hand, if the field size is set to change as the waveform is dynamically changed, the field size can be determined by one of the following alternative methods.

[0116] (1) Alt1: A method of comparing the field size when the UL waveform is CP-OFDM and the field size when the UL waveform is DFT-s-OFDM for each field and determining the size of each field based on the larger value of the two.

[0117] (2) Alt2: A method of comparing the overall (or combined size of specific multiple fields) field size when the UL waveform is CP-OFDM with the overall (or combined size of specific multiple fields) field size when the UL waveform is DFT-s-OFDM and determining the overall DCI field size (or the combined size of specific multiple fields) with the larger value of the two.

[0118] (2-1) For example, considering grouping fields A and B, when the UL waveform is set / instructed to DFT-s-OFDM, the field sizes are a1 / b1 respectively, and when the UL waveform is set / instructed to CP-OFDM, the field sizes are a2 / b2 respectively. The sum of the two field sizes can be defined as max{a1 + b1, a2 + b2}.

[0119] As another method, it can be considered to apply the existing DCI handling and / or terminal interpretation methods applied during BWP switching when the base station and the terminal set / instruct dynamic waveform switching. That is, in a situation where the size of a specific field X is A bits when the specific waveform 1 (e.g., CP-OFDM) and B bits when the specific waveform 2 (e.g., DFT-s-OFDM), when the base station instructs the dynamic switching from waveform 1 to waveform 2 via DCI, the size of field X in the corresponding DCI can be set to indicate the waveform 2 related information in the state of A bits.

[0120] At this time, if A > B, the terminal can be set to read only the first (MSB) B bits in field X and interpret / apply them as waveform 2 information. Conversely, if A < B, the terminal can be set to append B - A bits of "0" before the A bits indicated by field X and interpret / apply them as waveform 2 related B-bit information.

[0121] Furthermore, enabling / disabling operation for dynamic waveform switching can be set independently for each BWP. For example, dynamic waveform switching may be enabled in the first active UL BWP and disabled in the second active UL BWP. In other words, while the base station can dynamically configure / instruct the UL waveform in the first active UL BWP, the base station cannot dynamically configure / instruct the UL waveform in the second active UL BWP and can configure / instruct the UL waveform using the existing method (i.e., semi-static configuration method via higher layer signaling).

[0122] For this operation, a higher layer parameter indicating whether dynamic waveform switching is enabled or disabled can be configured to be provided independently for each UL BWP (i.e., a corresponding higher layer parameter is generated / indicated for the number of UL BWPs configured by the base station). Characteristically, if the base station does not transmit the higher layer parameter for a specific UL BWP or transmits the higher layer parameter with the parameter left empty, the UE can be configured / defined to determine whether dynamic waveform switching is enabled or disabled in the corresponding UL BWP according to the information (i.e., one of enable / disable) set by the higher layer parameter provided in the initial UL BWP.

[0123] A specific DCI format (e.g., DCI format 0_2) is defined so that the size of each field constituting the corresponding DCI can be configured by the base station. For this reason, if an explicit N-bit (e.g., N=1) DCI field is introduced (in the corresponding specific DCI format (e.g., DCI format 0_2)) for dynamic waveform switching, a method can be considered in which the base station sets / defines (individually for each waveform) the size of a specific (identical) DCI field to have different (or the same) values ​​depending on the waveform. Thereafter, the terminal can be configured to calculate / interpret the size of a specific DCI field according to the information set / defined by the base station in accordance with the waveform set / instructed via the explicit N-bit DCI field and receive (monitor) DCI accordingly.

[0124] When this proposed method is applied, the base station sets / instructs each field size differently (or the same) according to different waveforms, so that even when different waveforms are set / instructed, the overall size of the corresponding specific DCI format can be made the same (or similar).As a result, even when different waveforms are applied, the overall DCI size becomes the same / similar, so there is an advantage that the terminal does not need to perform the new operation proposed earlier.In addition, there is an advantage that the DCI overhead can be reduced by reducing the difference in DCI payload size required between different waveforms.

[0125] A specific configuration method is proposed as follows. First, this method configures / defines (individually for each waveform) the sizes of all DCI fields (configurable by the base station) constituting a specific DCI format (e.g., DCI format 0_2) so that they can have independent (e.g., different or the same) sizes according to different waveforms. That is, the base station can configure / instruct the sizes of all DCI fields (configurable by the base station) of DCI format 0_2 to have independent (e.g., different or the same) values ​​according to different waveforms via higher layer signaling (e.g., UE-specific RRC signaling). The terminal then receives the corresponding information (the size of each DCI field corresponding to each waveform) and can select / interpret an appropriate DCI field size (set for the specified waveform) according to which waveform is dynamically instructed from the base station, and receive (monitor) the corresponding DCI. Characteristically, since different sizes can be configured / instructed according to all DCI fields, the amount of information provided by the base station may be large.

[0126] Second, among the DCI fields (configurable by the base station) constituting a specific DCI format (e.g., DCI formats 0_2), the sizes of certain DCI fields are set / defined (separately for each waveform) to have independent (e.g., different or the same) sizes according to different waveforms, and the sizes of the remaining DCI fields (e.g., used in common by two waveforms) are set / defined to be the same regardless of the waveform. That is, the base station can set / instruct the sizes of certain DCI fields of DCI formats 0_2 (separately for each waveform) to have independent (e.g., different or the same) values ​​according to different waveforms through higher layer signaling (e.g., UE-specific RRC signaling), and can set / instruct the sizes of the remaining DCI fields to have the same value regardless of the waveform. Thereafter, the terminal receives the corresponding information (DCI field size set individually for each waveform and / or DCI field size set the same regardless of waveform) and can be configured to select / interpret it as the appropriate DCI field size (set for the specified waveform) depending on which waveform is dynamically instructed from the base station and receive (monitor) the corresponding DCI.

[0127] [Method of setting / instructing a waveform to a value specified by a specific DCI field in advance]

[0128] As in the previously proposed method, the base station can dynamically set / indicate a waveform using a specific field in DCI formats 0_0, 0_1, and 0_2 for scheduling PUSCH, but a method of setting / indicating a specific waveform in a higher layer signaling value or table referenced by an existing defined DCI field value can also be considered.

[0129] As a first method, a base station can additionally configure / indicate a specific UL waveform in information corresponding to each TDRA (Time Domain Resource Assignment) field value configured / indicated by the base station through higher layer signaling. That is, the base station provides k2, mappingType, and startSymbolAndLength information corresponding to each TDRA field value through higher layer signaling, and can additionally configure / indicate a UL waveform to this. Characteristically, a default UL waveform can be configured, and if a separate UL waveform value is not provided, the default UL waveform can be followed. The default UL waveform may be a value configured by the base station in cell common through higher layer signaling, a value configured in BWP specific, or a value separately configured / indicated.

[0130] As a second method, a method of predefining UL waveform values ​​for a specific MCS table can be considered. For example, when a specific MCS table is newly configured, a specific index can be additionally specified as UL waveform A (e.g., CP-OFDM), and another specific index can be additionally specified as UL waveform B (e.g., DFT-s-OFDM).

[0131] As another method, a method of dividing the HARQ process number field values ​​into two groups in advance and pairing a UL waveform for each group in advance can be considered. For example, if the HARQ process number field is X bits and there are a total of 2X HARQ IDs, K HARQ IDs (e.g., 0 to K-1) can be defined to use UL waveform A (e.g., CP-OFDM), and 2X-K HARQ IDs (e.g., K to 2X-1) can be defined to use UL waveform B (e.g., DFT-s-OFDM). The UE can operate by transmitting a PUSCH using a UL waveform predefined according to the corresponding HARQ process number field value.

[0132] Alternatively, a method of mapping a UL waveform according to information corresponding to each index of the TDRA table (i.e., according to the result of resource mapping) can be considered. As an example, the UL waveform to be used can be pre-configured / defined according to how many OFDM symbols are allocated according to the startSymbolAndLength (i.e., SLIV) value, and / or whether the mapping type is type A or type B, and / or the k2 value (or a combination of the above values). The UE can know in advance the UL waveform to be used according to how the TDRA information is configured / indicated / combined, and when the base station actually configures a TDRA value via the DCI field, the UE can be configured to transmit the PUSCH using the corresponding UL waveform.

[0133] Alternatively, a method may be considered in which different UL waveforms are used depending on the number of PRBs set / indicated via the FDRA field and / or the code rate value set / indicated via the MCS field. For example, when a certain number of PRBs or less (predefined or set / indicated by the base station) are allocated and / or an MCS index of a certain code rate or less is set, the UE may be configured to use waveform A (e.g., DFT-s-OFDM). Conversely, when a certain number of PRBs or more are allocated and / or an MCS index of a certain code rate or more is set, the UE may be configured to use waveform B (e.g., CP-OFDM). The UE may check the set value of the FDRA field and / or the set value of the MCS field (or a combination of values ​​in the fields) and configure it to transmit the PUSCH using the corresponding UL waveform.

[0134] [Method of indicating via aggregation level and CCE index]

[0135] Furthermore, instead of dynamically configuring / indicating a waveform via a DCI field, it is also possible to dynamically configure / indicate a UL waveform using the aggregation level value and / or CCE index value of the PDCCH on which the UL grant is transmitted. That is, an aggregation level value (or a CCE index value) and a UL waveform are paired in advance, and when the base station uses a specific aggregation level (or a specific CCE index value), the UE can interpret that the UL waveform paired therewith is configured / indicated. For example, when aggregation levels 1, 2, and 4 are used, it can be defined that waveform A (e.g., CP-OFDM) is used, and when aggregation levels 8 and 16 are used, it can be defined that waveform B (e.g., DFT-S-OFDM) is used. As another example, if the (lowest or highest) CCE index is greater than or equal to K, or if the (lowest or highest) CCE index is an even number, waveform A (e.g., CP-OFDM) can be defined to be used, and if the (lowest or highest) CCE index is less than K, or if the (lowest or highest) CCE index is an odd number, waveform B (e.g., DFT-S-OFM) can be defined to be used.

[0136] [Method of determining whether to use dynamic waveform switching depending on the value of a specific DCI field]

[0137] A method may be considered in which the base station informs the terminal whether to use dynamic waveform switching using the value of a specific DCI field. As a first method, whether to use dynamic waveform switching may be determined depending on the value of the HARQ process number field and whether it is an initial transmission / retransmission. For example, dynamic waveform switching may not be used during initial transmission with a specific HARQ ID, and may be configured to be used when instructing retransmission with the same HARQ ID. The terminal may interpret the DCI field to understand that dynamic waveform switching is not used during initial transmission with a specific HARQ ID, and may be configured to interpret the DCI field to understand that dynamic waveform switching is used when instructing retransmission with the same HARQ ID.

[0138] Alternatively, whether or not to perform dynamic waveform switching may be determined according to the value of the HARQ process number field. As an example, if the HARQ process number field is X bits and there are a total of 2X HARQ IDs, K HARQ IDs (e.g., numbers 0 to K-1) may be configured not to allow dynamic waveform switching, and 2X-K HARQ IDs (e.g., numbers K to 2X-1) may be configured to allow dynamic waveform switching. In this configuration, when an HARQ ID that allows dynamic waveform switching is configured / instructed, the terminal can determine which waveform is used, UL waveform A (e.g., CP-OFDM) or UL waveform B (e.g., DTS-S-OFDM), according to the configuration / instruction of other DCI fields, and configure it to be used for PUSCH transmission.

[0139] The proposed method may be configured / applied to other UL signals / channels, such as MSG3 PUSCH, MSGA Preamble / PUSCH, and / or PUSCH / PUCCH. Furthermore, since an example of the proposed method described above may be included as one of the implementation methods of this specification, it is clear that it can be considered as a type of proposed method. Furthermore, the proposed methods described above may be implemented independently, or may be implemented in the form of a combination (or merging) of several proposed methods. Information regarding whether to apply the proposed method (or information regarding the rules of the proposed method) may be notified to the terminal by a base station via a predefined signal (e.g., a physical layer signal or a higher layer signal). The higher layer may include one or more functional layers, such as MAC, RLC, PDCP, RRC, and SDAP.

[0140] [Device claim related explanation]

[0141] The above-described embodiment will now be described in detail from the perspective of the operation of a terminal with reference to Figure 5. The methods described below are merely divided for the convenience of explanation, and it goes without saying that, unless mutually exclusive, some components of one method can be substituted for some components of another method or can be combined with each other and applied.

[0142] FIG. 5 is a diagram showing an example of an operation process of a terminal in a system applicable to the present disclosure.

[0143] In step S510, a user equipment (UE) receives downlink control information (DCI) from a base station (BS) that is associated with a dynamic instruction for one of a first waveform or a second waveform.

[0144] In step S520, for each field in the DCI, if the first bit-width for the first waveform and the second bit-width for the second waveform are different, the terminal determines the bit-width of each field as the maximum value of the first bit-width and the second bit-width.

[0145] In step S530, when the first waveform is indicated by the DCI and the second bit width is determined for each field, only the LSBs (least significant bits) of the number corresponding to the first bit width for each field are decoded.

[0146] In step S540, the terminal performs uplink transmission based on the determined waveform.

[0147] According to various embodiments of the present disclosure, the embodiment of FIG. 5 may further include a step of ignoring each field if the first waveform is indicated by the DCI, the second bit width is determined for each field, and the number corresponding to the first bit width is 0.

[0148] According to various embodiments of the present disclosure, the DCI may correspond to DCI format 0_1 ​​or DCI format 0_2.

[0149] According to various embodiments of the present disclosure, the first waveform may be Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) and the second waveform may be Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing (DFT-s-OFDM), or the first waveform may be DFT-s-OFDM and the second waveform may be CP-OFDM.

[0150] According to various embodiments of the present disclosure, the embodiment of FIG. 5 may further include a step of determining the bit width of the entire field as the maximum value of the third bit width and the fourth bit width when a third bit width, which is the sum of the bit widths of the entire field for the first waveform, is different from a fourth bit width, which is the sum of the bit widths of the entire field for the second waveform, for the entire field in the DCI.

[0151] According to various embodiments of the present disclosure, (i) for each field in the DCI, the first bit width for the first waveform and the second bit width for the second waveform are different, and (ii) after the first waveform is indicated by the DCI and the first bit width is applied to each field in the DCI, when a second DCI is received indicating waveform switching to the second waveform, each field in the second DCI can be configured so that information regarding the second waveform is decoded based on the first bit width.

[0152] According to various embodiments of the present disclosure, the embodiment of FIG. 5 may further include a step of decoding only the most significant bit (MSB) of a number corresponding to the second bit width for each field in the second DCI when the first bit width is greater than the second bit width, and a step of decoding each field in the second DCI by adding a number of 0s corresponding to the difference between the first bit width and the second bit width before each field in the second DCI when the first bit width is smaller than the second bit width.

[0153] According to various embodiments of the present disclosure, there is provided a terminal in a wireless communication system, the terminal including a transceiver and at least one processor, the at least one processor being configured to perform the method of operating the terminal according to FIG.

[0154] According to various embodiments of the present disclosure, there is provided an apparatus for controlling a terminal in a communication system, the apparatus including at least one processor and at least one memory operatively connected to the at least one processor, the at least one memory being configured to store instructions, when executed by the at least one processor, for performing the method for operating a terminal according to FIG.

[0155] According to various embodiments of the present disclosure, one or more non-transitory computer readable media (CRM) are provided that store one or more instructions, which, when executed by one or more processors, perform operations, and the operations may include the method of operating a terminal according to FIG.

[0156] [Explanation regarding base station claims]

[0157] Hereinafter, the above-mentioned embodiment will be described in detail from the viewpoint of the operation of a base station with reference to Fig. 6. The methods described below are merely separated for the convenience of explanation, and it goes without saying that some components of one method can be substituted for some components of another method or can be combined with each other to be applied, unless they are mutually exclusive.

[0158] FIG. 6 is a diagram illustrating an example of an operation process of a base station in a system applicable to the present disclosure.

[0159] In step S610, a base station (BS) transmits downlink control information (DCI) to a user equipment (UE) that indicates a dynamic instruction for one of a first waveform or a second waveform. For each field in the DCI, if a first bit-width for the first waveform and a second bit-width for the second waveform are different, the bit-width of each field is determined as the maximum value of the first bit-width and the second bit-width. When the first waveform is indicated by the DCI and the second bit-width is determined for each field, only the least significant bits (LSBs) of the number corresponding to the first bit-width are decoded for each field.

[0160] In step S620, the base station performs uplink reception based on the determined waveform.

[0161] According to various embodiments of the present disclosure, the first waveform is indicated by the DCI, the second bit width is determined for each field, and if the number corresponding to the first bit width is 0, the field can be ignored.

[0162] According to various embodiments of the present disclosure, the DCI may correspond to DCI format 0_1 ​​or DCI format 0_2.

[0163] According to various embodiments of the present disclosure, the first waveform may be Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) and the second waveform may be Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing (DFT-s-OFDM), or the first waveform may be DFT-s-OFDM and the second waveform may be CP-OFDM.

[0164] According to various embodiments of the present disclosure, for all fields in the DCI, if a third bit-width, which is the sum of the bit widths of all fields for the first waveform, is different from a fourth bit-width, which is the sum of the bit widths of all fields for the second waveform, the bit-width of the all fields can be determined as the maximum value of the third bit-width and the fourth bit-width.

[0165] According to various embodiments of the present disclosure, when the first bit width for the first waveform and the second bit width for the second waveform are different for each field in the DCI, the first waveform is indicated by the DCI, the first bit width is applied to each field in the DCI, and then a second DCI is transmitted indicating waveform switching to the second waveform, each field in the second DCI can be configured so that information regarding the second waveform is decoded based on the first bit width.

[0166] According to various embodiments of the present disclosure, when the first bit width is greater than the second bit width, only the most significant bit (MSB) of each field in the DCI, the number of which corresponds to the second bit width, may be decoded. When the first bit width is smaller than the second bit width, each field in the DCI may be decoded by adding a number of zeros corresponding to the difference between the first bit width and the second bit width before the field in the DCI.

[0167] According to various embodiments of the present disclosure, there is provided a base station in a wireless communication system, the base station including a transceiver and at least one processor, the at least one processor being configured to perform the base station operating method according to FIG.

[0168] According to various embodiments of the present disclosure, there is provided an apparatus for controlling a base station in a wireless communication system, the apparatus including at least one processor and at least one memory operatively connected to the at least one processor, the at least one memory being configured to store instructions that, when executed by the at least one processor, perform a method for operating a base station according to FIG.

[0169] According to various embodiments of the present disclosure, one or more non-transitory computer readable mediums (CRMs) are provided that store one or more instructions, which, when executed by one or more processors, perform operations, and the operations may include the method of operating a base station according to FIG.

[0170] [Wireless Devices Applicable to the Present Disclosure]

[0171] In the following, examples of wireless devices to which various embodiments of the present disclosure may be applied are described.

[0172] FIG. 7 is a diagram showing an example of the structure of a first device and a second device in a system applicable to the present disclosure.

[0173] The first device 1600 may include a processor 1610, an antenna unit 1620, a transceiver 1630, and a memory 1640.

[0174] The processor 1610 performs baseband-related signal processing and may include an upper layer processing unit 1611 and a physical layer processing unit 1615. The upper layer processing unit 1611 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 1615 may process operations of the PHY layer. For example, if the first device 1600 is a base station device in base station-terminal communication, the physical layer processing unit 1615 may perform uplink reception signal processing, downlink transmission signal processing, etc. For example, if the first device 1600 is a first terminal device in terminal-terminal communication, the physical layer processing unit 1615 may perform downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, etc. In addition to performing baseband-related signal processing, the processor 1610 may also control the overall operation of the first device 1600.

[0175] The antenna unit 1620 may include one or more physical antennas, and when multiple antennas are included, MIMO transmission and reception can be supported. The transceiver 1630 may include an RF (Radio Frequency) transmitter and an RF receiver. The memory 1640 may store information processed by the processor 1610, as well as software, an operating system, applications, etc. related to the operation of the first device 1600, and may also include components such as buffers.

[0176] The processor 1610 of the first device 1600 can be configured to implement the operation of a base station in base station-terminal communication (or the operation of a first terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0177] The second device 1650 may include a processor 1660, an antenna unit 1670, a transceiver 1680, and a memory 1690.

[0178] The processor 1660 performs baseband-related signal processing and may include an upper layer processing unit 1661 and a physical layer processing unit 1665. The upper layer processing unit 1661 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 1665 may process operations of the PHY layer. For example, if the second device 1650 is a terminal device in base station-terminal communication, the physical layer processing unit 1665 may perform downlink reception signal processing, uplink transmission signal processing, etc. For example, if the second device 1650 is a second terminal device in terminal-terminal communication, the physical layer processing unit 1665 may perform downlink reception signal processing, uplink transmission signal processing, sidelink reception signal processing, etc. In addition to performing baseband-related signal processing, the processor 1660 may also control the overall operation of the second device 1660.

[0179] The antenna unit 1670 may include one or more physical antennas, and when multiple antennas are included, MIMO transmission and reception can be supported. The transceiver 1680 may include an RF transmitter and an RF receiver. The memory 1690 may store information processed by the processor 1660, as well as software, an operating system, applications, etc. related to the operation of the second device 1650, and may also include components such as buffers.

[0180] The processor 1660 of the second device 1650 can be configured to implement the operation of a terminal in base station-terminal communication (or the operation of a second terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0181] In the operation of the first device 1600 and the second device 1650, the matters described in the examples of the present disclosure regarding the base station and terminal in base station-terminal communication (or the first terminal and second terminal in terminal-terminal communication) can be applied equally, and duplicate explanations will be omitted.

[0182] Here, the wireless communication technologies implemented in the devices 1600, 1650 of the present disclosure may include not only LTE, NR, and 6G, but also various other wireless communication technologies.

[0183] The claims set forth in the various embodiments of the present disclosure may be combined in various ways. For example, the technical features of the method claims of the various embodiments of the present disclosure may be combined to realize an apparatus, or the technical features of the apparatus claims of the various embodiments of the present disclosure may be combined to realize a method. Furthermore, the technical features of the method claims of the various embodiments of the present disclosure and the technical features of the apparatus claims may be combined to realize an apparatus, or the technical features of the method claims of the various embodiments of the present disclosure and the technical features of the apparatus claims may be combined to realize a method.

[0184] [Claims at the time of international application] [Claim 1] 1. A method of operating a terminal (user equipment: UE) in a wireless communication system, comprising: receiving, from a base station (BS), downlink control information (DCI) associated with a dynamic instruction for one of a first waveform or a second waveform; determining, for each field in the DCI, a bit width of the field as a maximum value of the first bit width and the second bit width when a first bit width for the first waveform and a second bit width for the second waveform are different; when the first waveform is indicated by the DCI and the second bit width is determined for each of the fields, decoding only a number of least significant bits (LSBs) corresponding to the first bit width for each of the fields; performing an uplink transmission based on the determined waveform. [Claim 2] 2. The method of claim 1, further comprising: determining the second bit width for each field when the first waveform is indicated by the DCI; and ignoring each field when the number corresponding to the first bit width is 0. [Claim 3] The method of claim 1 , wherein the DCI corresponds to DCI format 0_1 ​​or DCI format 0_2. [Claim 4] The first waveform is CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing) and the second waveform is DFT-s-OFDM (Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing), or The method of claim 1 , wherein the first waveform is DFT-s-OFDM and the second waveform is CP-OFDM. [Claim 5] 2. The method of claim 1, further comprising: when a third bit-width, which is the sum of bit widths of all fields for the first waveform, and a fourth bit-width, which is the sum of bit widths of all fields for the second waveform, are different for all fields in the DCI, determining the bit-width of the all fields as the maximum value of the third bit-width and the fourth bit-width. [Claim 6] For each field in the DCI, the first bit width for the first waveform and the second bit width for the second waveform are different, When the first waveform is indicated by the DCI, and the first bit width is applied to each field in the DCI, and then a second DCI is received instructing waveform switching to the second waveform, 2. The method of claim 1, wherein each field in the second DCI is set so that information about the second waveform is decoded based on the first bit width. [Claim 7] If the first bit width is greater than the second bit width, decoding only the most significant bit (MSB) of a number corresponding to the second bit width for each field in the second DCI; 7. The method of claim 6, further comprising: if the first bit width is smaller than the second bit width, decoding each field in the second DCI by prefixing each field with a number of zeros corresponding to a difference between the first bit width and the second bit width. [Claim 8] A method of operating a base station (BS) in a wireless communication system, comprising: transmitting, to a user equipment (UE), downlink control information (DCI) associated with a dynamic instruction for one of the first waveform or the second waveform; For each field in the DCI, if a first bit width for the first waveform and a second bit width for the second waveform are different, the bit width of each field is determined as the maximum value of the first bit width and the second bit width; When the first waveform is indicated by the DCI and the second bit width is determined for each field, only LSBs (least significant bits) of a number corresponding to the first bit width are decoded for each field, performing uplink reception based on the determined waveform. [Claim 9] 9. The method of claim 8, wherein the DCI indicates the first waveform, the second bit width is determined for each field, and if the number corresponding to the first bit width is 0, the field is ignored. [Claim 10] The method of claim 8, wherein the DCI corresponds to DCI format 0_1 ​​or DCI format 0_2. [Claim 11] the first waveform is CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing), the second waveform is DFT-s-OFDM (Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing); or The method of claim 8 , wherein the first waveform is DFT-s-OFDM and the second waveform is CP-OFDM. [Claim 12] If a third bit width, which is the sum of the bit widths of all fields for the first waveform, is different from a fourth bit width, which is the sum of the bit widths of all fields for the second waveform, for all fields in the DCI, The method of claim 8 , wherein the bit width of the entire field is determined as the maximum value of the third bit width and the fourth bit width. [Claim 13] For each field in the DCI, the first bit width for the first waveform and the second bit width for the second waveform are different, When the first waveform is indicated by the DCI, the first bit width is applied to each field in the DCI, and then a second DCI is transmitted to indicate waveform switching to the second waveform, 9. The method of claim 8, wherein each field in the second DCI is set so that information about the second waveform is decoded based on the first bit width. [Claim 14] If the first bit width is greater than the second bit width, only the most significant bits (MSBs) of the number corresponding to the second bit width are decoded for each field in the DCI; 14. The method of claim 13, wherein if the first bit width is smaller than the second bit width, each field in the DCI is decoded by prepending a number of zeros corresponding to the difference between the first bit width and the second bit width. [Claim 15] A terminal in a wireless communication system, Transmitter / receiver; at least one processor; and at least one memory operably connected to said at least one processor and storing instructions that, when executed by said at least one processor, perform operations; A terminal, wherein the operations include all steps of the method according to any one of claims 1 to 7. [Claim 16] A base station in a wireless communication system, comprising: Transmitter / receiver; at least one processor; and at least one memory operably connected to said at least one processor and storing instructions that, when executed by said at least one processor, perform operations; The operations include all steps of the method according to any one of claims 8 to 14. Base station. [Claim 17] A control device for controlling a terminal in a wireless communication system, at least one processor; and at least one memory operatively connected to said at least one processor; the at least one memory stores instructions that perform operations based on being executed by the at least one processor; The operation of the control device includes all steps of the method according to any one of claims 1 to 7. [Claim 18] A control device for controlling a base station in a wireless communication system, at least one processor; and at least one memory operatively connected to said at least one processor; the at least one memory stores instructions that perform operations based on being executed by the at least one processor; The operations include all steps of the method according to any one of claims 8 to 14. Control device. [Claim 19] one or more non-transitory computer-readable media storing one or more instructions; the one or more instructions perform an operation upon being executed by one or more processors; A computer-readable medium, wherein the operations include all steps of the method according to any one of claims 1 to 7. [Claim 20] one or more non-transitory computer-readable media storing one or more instructions; the one or more instructions perform an operation upon being executed by one or more processors; A computer-readable medium, wherein the operations include all steps of the method according to any one of claims 8 to 14.

Claims

1. 1. A method of operating a terminal (user equipment (UE)) in a wireless communication system, comprising: receiving, from a base station (BS), downlink control information (DCI) associated with a dynamic instruction for one of the first waveform or the second waveform; determining a bit width of each field in the DCI as a maximum value of the first bit width and the second bit width when a first bit width for the first waveform and a second bit width for the second waveform are different; when the first waveform is indicated by the DCI and the second bit width is determined for each of the fields, decoding only least significant bits (LSBs) of a number corresponding to the first bit width for each of the fields; performing an uplink transmission based on the determined waveform.

2. 2. The method of claim 1, further comprising: determining the second bit width for each field when the first waveform is indicated by the DCI; and ignoring each field when the number corresponding to the first bit width is 0.

3. The method of claim 1 , wherein the DCI corresponds to DCI format 0_1 ​​or DCI format 0_2.

4. The first waveform is CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing) and the second waveform is DFT-s-OFDM (Discrete Fourier TRANSFORM spread Orthogonal Frequency Division Multiplexing), or The method of claim 1 , wherein the first waveform is DFT-s-OFDM and the second waveform is CP-OFDM.

5. 2. The method of claim 1, further comprising: determining the bit width of the entire field as the maximum value of the third bit width and the fourth bit width when a third bit width, which is the sum of the bit widths of the entire field for the first waveform, is different from a fourth bit width, which is the sum of the bit widths of the entire field for the second waveform, for the entire field in the DCI.

6. For each field in the DCI, the first bit width for the first waveform and the second bit width for the second waveform are different, When the first waveform is indicated by the DCI, and the first bit width is applied to each field in the DCI, and then a second DCI is received instructing waveform switching to the second waveform, 2. The method of claim 1, wherein each field in the second DCI is set so that information about the second waveform is decoded based on the first bit width.

7. If the first bit width is greater than the second bit width, decoding only the most significant bits (MSBs) of the number corresponding to the second bit width for each field in the second DCI; 7. The method of claim 6, further comprising: if the first bit width is smaller than the second bit width, decoding each field in the second DCI by prefixing each field with a number of zeros corresponding to the difference between the first bit width and the second bit width.

8. A method of operating a base station (BS) in a wireless communication system, comprising: transmitting, to a user equipment (UE), downlink control information (DCI) associated with a dynamic indication for one of the first waveform or the second waveform; For each field in the DCI, if a first bit width for the first waveform and a second bit width for the second waveform are different, the bit width of each field is determined as the maximum value of the first bit width and the second bit width; When the first waveform is indicated by the DCI and the second bit width is determined for each field, only LSBs (least significant bits) of a number corresponding to the first bit width are decoded for each field; performing uplink reception based on the determined waveform.

9. 9. The method of claim 8, wherein the DCI indicates the first waveform, the second bit width is determined for each field, and if the number corresponding to the first bit width is 0, the field is ignored.

10. The method of claim 8 , wherein the DCI corresponds to DCI format 0_1 ​​or DCI format 0_2.

11. the first waveform is CP-OFDM (Cyclic Prefix Orthogonal Frequency Division Multiplexing), the second waveform is DFT-s-OFDM (Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing); or The method of claim 8, wherein the first waveform is DFT-s-OFDM and the second waveform is CP-OFDM.

12. If a third bit width, which is the sum of the bit widths of all fields for the first waveform, is different from a fourth bit width, which is the sum of the bit widths of all fields for the second waveform, for all fields in the DCI, The method of claim 8 , wherein the bit width of the entire field is determined as the maximum value of the third bit width and the fourth bit width.

13. For each field in the DCI, the first bit width for the first waveform and the second bit width for the second waveform are different, When the first waveform is indicated by the DCI, the first bit width is applied to each field in the DCI, and then a second DCI indicating waveform switching to the second waveform is transmitted, 9. The method of claim 8, wherein each field in the second DCI is set so that information about the second waveform is decoded based on the first bit width.

14. If the first bit width is greater than the second bit width, only the most significant bits (MSBs) of the number corresponding to the second bit width are decoded for each field in the DCI; 14. The method of claim 13, wherein if the first bit width is smaller than the second bit width, each field in the DCI is decoded by prepending a number of zeros corresponding to the difference between the first bit width and the second bit width.

15. A terminal in a wireless communication system, Transceiver; at least one processor; and at least one memory operably connected to said at least one processor and storing instructions that, when executed by said at least one processor, perform operations; A terminal, wherein said operations comprise all steps of the method according to any one of claims 1 to 7.

16. A base station in a wireless communication system, comprising: Transceiver; at least one processor; and at least one memory operably connected to said at least one processor and storing instructions that, when executed by said at least one processor, perform operations; The operations include all steps of the method according to any one of claims 8 to 14. Base station.

17. A control device for controlling a terminal in a wireless communication system, at least one processor; and at least one memory operatively connected to said at least one processor; the at least one memory stores instructions that perform operations based on being executed by the at least one processor; The control device, wherein the operations include all steps of the method according to any one of claims 1 to 7.

18. A control device for controlling a base station in a wireless communication system, at least one processor; and at least one memory operatively connected to said at least one processor; the at least one memory stores instructions that perform operations based on being executed by the at least one processor; The operations include all steps of the method according to any one of claims 8 to 14. Control device.

19. one or more non-transitory computer-readable media storing one or more instructions; the one or more instructions perform an operation upon being executed by one or more processors; A computer readable medium, wherein the operations include all steps of the method according to any one of claims 1 to 7.

20. one or more non-transitory computer-readable media storing one or more instructions; the one or more instructions perform an operation upon being executed by one or more processors; A computer readable medium, wherein the operations include all steps of the method according to any one of claims 8 to 14.

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