Apparatus and method for dynamic waveform switching in wireless communication system

Abstract

Various embodiments of the present disclosure provide an operation method of a user equipment (UE) in a wireless communication system, the method comprising the steps of: receiving downlink control information (DCI) related to a dynamic indication for one of a first waveform and a second waveform from a base station (BS); if a first bit width for the first waveform and a second bit width for the second waveform are different for each field within the DCI, setting a bit width of each field to a maximum value among 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, decoding only as many least significant bits (LSBs) for each field as indicated by the first bit width; and transmitting an uplink based on the determined waveform.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system. More specifically, the present disclosure relates to an apparatus and method for performing dynamic waveform switching in a wireless communication system. Background Art

[0002] As more and more communication devices require greater communication capacity, enhanced mobile broadband communication is needed compared to existing radio access technologies. Massive machine communication (MTC), which provides various services anytime and anywhere by connecting many devices and objects, is also one of the main issues to be considered in next-generation communication. In addition, the design of a communication system considering services / UEs sensitive to reliability and latency has been discussed. As described above, the introduction of next-generation radio access technologies considering enhanced mobile broadband communication, massive MTC, ultra-reliable low-latency communication (URLLC), etc. has been discussed, and in the present disclosure, this technology is referred to as NR for convenience. Summary of the Invention

[0003] Technical Problem

[0004] To solve the above and other problems, the present disclosure provides an apparatus and method for performing dynamic waveform switching in a wireless communication system.

[0005] The technical objectives to be achieved by the present disclosure are not limited to those described above only by way of example, and other technical objectives not mentioned can be clearly understood by those skilled in the art to which the present disclosure pertains through the following description.

[0006] Technical Solution

[0007] To solve the above and other problems, the present disclosure provides an apparatus and method for performing dynamic waveform switching in a wireless communication system.

[0008] The technical objectives to be achieved by the present disclosure are not limited to those described above only by way of example, and other technical objectives not mentioned can be clearly understood by those skilled in the art to which the present disclosure pertains through the following description.

[0009] Advantageous Effects

[0010] To solve the above and other problems, the present disclosure can provide an apparatus and method for performing dynamic waveform switching in a wireless communication system. Brief Description of the Drawings

[0011] The accompanying drawings are included to provide a further understanding of the present disclosure and form a part of the detailed description. The accompanying drawings illustrate embodiments of the present disclosure and, together with the description, are used to explain the technical features of the present disclosure. The technical features of the present disclosure are not limited to specific accompanying drawings, and the features disclosed in each accompanying drawing can be combined with each other to form new embodiments. The reference numerals in each accompanying drawing may represent structural elements.

[0012] Figure 1 An example of a physical channel used in a system applicable to the present disclosure and a general signal transmission method using the physical channel is shown.

[0013] Figure 2 An example of the structure of a radio frame used in a system applicable to the present disclosure is shown.

[0014] Figure 3 An example of the slot structure used in a system applicable to the present disclosure is shown.

[0015] Figure 4 An example of the slot structure of a radio frame used in a system applicable to the present disclosure is shown.

[0016] Figure 5 An example of the operation process of a UE in a system applicable to the present disclosure is shown.

[0017] Figure 6 An example of the operation process of a base station in a system applicable to the present disclosure is shown.

[0018] Figure 7 An example of the structure of a first device and a second device in a system applicable to the present disclosure is shown. Detailed Description

[0019] In various embodiments of the present disclosure, "A or B" may represent "only A", "only B", or "both A and B". In other words, in various embodiments of the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in various embodiments of the present disclosure, "A, B, or C" may represent "only A", "only B", "only C", or "any combination of A, B, and C".

[0020] The slash ( / ) or comma used in various embodiments of the present disclosure may represent "and / or". For example, "A / B" may represent "A and / or B". Therefore, "A / B" may represent "only A", "only B", or "both A and B". For example, "A, B, C" may represent "A, B, or C".

[0021] In various embodiments of the present disclosure, "at least one of A and B" may represent "only A", "only B", or "both A and B". Further, in various embodiments of the present disclosure, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted to have the same meaning as "at least one of A and B".

[0022] Further, in various embodiments of the present disclosure, "at least one of A, B, and C" may represent "only A", "only B", "only C", or "any combination of A, B, and C". Further, "at least one of A, B, or C" or "at least one of A, B, and / or C" may mean "at least one of A, B, and C".

[0023] Further, parentheses used in various embodiments of the present disclosure may represent "for example". Specifically, when describing "control information (PDCCH)", "PDCCH" may be presented as an example of "control information". In other words, "control information" in various embodiments of the present disclosure is not limited to "PDCCH", and "PDDCH" may be presented as an example of "control information". Further, even when describing "control information (i.e., PDCCH)", "PDCCH" may be presented as an example of "control information".

[0024] In various embodiments of the present disclosure, technical features separately described in one drawing may be implemented separately or simultaneously.

[0025] General signal transmission method in 3GPP

[0026] Physical channel and general signal transmission

[0027] Figure 1 Examples of physical channels used in a system applicable to the present disclosure and a general signal transmission method using the physical channels are shown. More specifically, Figure 1 Physical channels used in a 3GPP system and general signal transmission are shown.

[0028] Figure 1 Physical channels used in a 3GPP system and general signal transmission are shown. In a wireless communication system, a UE receives information from an eNB via a downlink (DL), and the UE transmits information to the eNB via an uplink (UL). Information transmitted and received by the eNB and the UE includes data and various control information, and there are various physical channels according to the type / use of the information transmitted and received by the eNB and the UE.

[0029] In S11, a UE that is powered on again after a power outage or enters a new cell performs an initial cell search operation, such as synchronizing with a base station (BS). To this end, the UE receives a primary synchronization channel (PSCH) and a secondary synchronization channel (SSCH) from the base station to synchronize with the base station, and obtains information such as a cell identifier (ID). In addition, the UE may receive a physical broadcast channel (PBCH) from the base station and obtain in-cell broadcast information. The UE may receive a downlink reference signal (DL RS) during the initial cell search step to check the downlink channel state.

[0030] In S12, a UE that has completed the initial cell search may receive a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) corresponding to the PDCCH to obtain more detailed system information.

[0031] Next, in S13 to S16, the UE may perform a random access procedure to complete access to the base station. Specifically, in S13 the UE may transmit a preamble on a physical random access channel (PRACH), and in S14 receive a random access response (RAR) for the preamble on the PDCCH and the PDSCH corresponding to the PDCCH. Thereafter, in S15 the UE may use the scheduling information in the RAR to transmit a physical uplink shared channel (PUSCH), and in S16 perform a contention resolution procedure such as the PDCCH and the PDSCH corresponding to the PDCCH.

[0032] Next, the UE that performs the above process may perform PDCCH / PDSCH reception S17 and PUSCH / physical uplink control channel (PUCCH) transmission S18 as a general uplink / downlink signal transmission process. The control information sent by the UE to the base station is referred to as uplink control information (UCI). UCI includes hybrid automatic repeat request (HARQ) acknowledgement / negative ACK (ACK / NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. UCI is usually transmitted on the PUCCH, but may also be transmitted on the PUSCH if it is necessary to transmit control information and data simultaneously. The UE may transmit UCI non-periodically on the PUSCH based on a network request / indication.

[0033] Orthogonal Frequency Division Multiplexing (OFDM) parameter set

[0034] The new RAT system uses an OFDM transmission scheme or a transmission scheme similar thereto. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the parameter set of existing LTE / LTE-A as it is, but with a larger system bandwidth (e.g., 100 MHz). Alternatively, a cell may support multiple parameter sets. In other words, UEs operating with different parameter sets may coexist in a cell.

[0035] Radio frame structure

[0036] Figure 2 An example of the structure of a radio frame used in a system applicable to the present disclosure is shown.

[0037] In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is defined as two 5-ms half-frames (HFs). A half-frame is defined as five 1-ms sub-frames (SFs). A sub-frame is divided into one or more time slots, and the number of time slots in a sub-frame depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 OFDM(A) symbols. When normal CP is used, each time slot includes 14 symbols. When extended CP is used, each time slot includes 12 symbols. The symbols may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or DFT-s-OFDM symbols).

[0038] Table 1 shows that when normal CP is used, the number of symbols per time slot, the number of time slots per frame, and the number of time slots per sub-frame vary according to the SCS.

[0039] [Table 1]

[0040] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb > <![CDATA[N fame，u slot > <![CDATA[N subframe，u sulot > 15KHz (u = 0) 14 10 1 30KHz (u = 1) 14 20 2 60KHz (u = 2) 14 40 4 120KHz (u = 3) 14 80 8 240KHz (u = 4) 14 160 16

[0041] N slot symb is the number of symbols in a time slot. N frame,u slot is the number of time slots in a frame. N subframe,u slot is the number of time slots in a sub-frame.

[0042] Table 2 shows that when extended CP is used, the number of symbols per time slot, the number of time slots per frame, and the number of time slots per sub-frame vary according to the SCS.

[0043] [Table 2]

[0044] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb > <![CDATA[N frame，u slot > <![CDATA[N subframe,u slot > 60KHz (u = 2) 12 40 4

[0045] NR supports multiple parameter sets (or subcarrier spacings (SCS)) for supporting various 5G services. For example, when the SCS is 15 kHz, it supports wide areas in traditional cellular bands. When the SCS is 30 kHz / 60 kHz, it supports dense cities, lower latency, and wider carrier bandwidths. And when the SCS is 60 kHz or higher, it supports bandwidths greater than 24.25 GHz to overcome phase noise.

[0046] NR bands can be defined as two types of frequency ranges (FR1 and FR2). The values of the frequency ranges can vary. For example, the two frequency ranges (FR1 and FR2) can be as shown in Table 3 below. For ease of description, among the frequency ranges used in the NR system, FR1 can represent the "below 6 GHz range", and FR2 can represent the "above 6 GHz range", and can be referred to as millimeter wave (mmW).

[0047] [Table 3]

[0048] Frequency range name Corresponding frequency range Subcarrier spacing FR1 450MHz - 6000MHz 15, 30, 60kHz FR2 24250MHz - 52600MHz 60, 120, 240kHz

[0049] As described above, the values of the frequency ranges of the NR system can be changed. For example, FR1 can include frequency bands from 410 MHz to 7125 MHz, as shown in Table 4 below. That is to say, FR1 can include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included in FR1 can include unlicensed bands. The unlicensed bands can be used for various purposes, such as communication for vehicles (e.g., autonomous driving).

[0050] [Table 4]

[0051] Frequency range name Corresponding frequency range Subcarrier spacing FR1 410MHz - 7125MHz 15, 30, 60kHz FR2 24250MHz - 52600MHz 60, 120, 240kHz

[0052] In the NR system, the OFDM(A) parameter sets (e.g., SCS, CP length, etc.) can be configured differently among multiple cells merged into one UE. Therefore, the (absolute time) durations of time resources (e.g., SF, time slot, or TTI) (collectively referred to as time unit (TU) for convenience) composed of the same number of symbols can be configured differently among the merged cells.

[0053] Figure 3 An example of the time slot structure used in the system applicable to the present disclosure is shown.

[0054] A time slot includes multiple symbols in the time domain. For example, a time slot includes 7 symbols under normal CP, while a time slot includes 6 symbols under extended CP. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined as multiple (P) consecutive RBs in the frequency domain and can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed through an active BWP, and only one BWP can be activated in a UE. In a resource grid, each element is called a resource element (RE), and one complex symbol can be mapped to each RE.

[0055] Figure 4 An example of the time slot structure of a radio frame used in a system applicable to the present disclosure is shown.

[0056] More specifically, Figure 4 The time slot structure of a frame of the NR system as an exemplary system is shown.

[0057] As Figure 4 shown, the frame structure of NR is characterized by a self - contained structure, where a DL control channel, DL or UL data, UL control channel, etc. can all be included in one time slot. In this case, DL data scheduling information, UL data scheduling information, etc. can be sent on the DL control channel, and ACK / NACK information of DL data, CSI information (modulation and coding scheme information, MIMO transmission - related information, etc.), scheduling requests, etc. can be sent on the UL control channel. In Figure 4 , a time gap for DL - to - UL or UL - to - DL switching may exist between the control area and the data area. In addition, a part of the DL control channel / DL data / UL data / UL control channel may not be configured within one time slot. Alternatively, the order of the channels constituting one time slot can vary. (e.g., DL control / DL data / UL control / UL data or UL control / UL data / DL control / DL data, etc.).

[0058] Composition and method of the present invention

[0059] Currently, in NR, it is defined that the base station indicates which waveform among CP - OFDM and DFT - s - OFDM to use via RRC signaling (e.g., SIB1, UE - specific RRC signaling, etc.).

[0060] To explain in more detail the content defined in 3GPP TS 38.331, in the 4-step RACH procedure, if "msg3-transformPrecoder" is set to enabled, the waveform of PUSCHMsg.3PUSCH can be defined to use DFT-s-OFDM as the UL waveform, and if the "msg3-transformPrecoder" parameter field is empty, the waveform of PUSCHMsg.3PUSCH is defined to use CP-OFDM as the UL waveform. In the 2-step RACH procedure, if "msgA-TransformPrecoder" is set to enabled, the waveform of Msg.A PUSCH is defined to use DFT-s-OFDM, and if "msgA-TransformPrecoder" is set to disabled, the waveform of Msg.A PUSCH is defined to use CP-OFDM.

[0061] Finally, if "TransformPrerecoder" is set to enabled, the waveforms of other UL channels (e.g., normal PUSCH, configured PUSCH, etc.) except Msg.3PUSCH and Msg.APUSCH are defined to use DFT-s-OFDM, and if "TransformPrerecoder" is set to disabled, it is defined to use CP-OFDM. Additionally, if the parameter "transformPrecoder" is not indicated separately, it is defined to follow the configuration of "msg3-transformPrecoder".

[0062] In the present disclosure, the expression that the base station configures / indicates the UL waveform as CP-OFDM means that the values of "msg3-transformPrecoder" and / or "msgA-TransformPrecoder" and / or "transformPrecoder" as parameters transmitted via RRC signaling (e.g., SIB1, UE-specific RRC signaling, etc.) have been set to disabled, and also means that the values of "transformPrecoder" newly defined in DCI formats 0_0, 0_1, 0_2, etc. (or that can be used by the UE reinterpreting existing fields) have been set to disabled. On the other hand, the base station configures / indicates the UL waveform as DFT-s-OFDM means that the values of "msg3-transformPrecoder" and / or "msgA-TransformPrecoder" and / or "transformPrecoder" as parameters transmitted via RRC signaling (e.g., SIB1, UE-specific RRC signaling, etc.) have been set to enabled, and also means that the values of "transformPrecoder" newly defined in DCI formats 0_0, 0_1, 0_2, etc. (or that can be used by the UE reinterpreting existing fields) have been set to enabled.

[0063] A method of configuring / indicating the waveform via DCI can be considered when introducing the dynamic waveform switching method, and a proposed method for the DCI design details that can be reconsidered based on this method is proposed in the present disclosure.

[0064] Method to consider when dynamically configuring waveforms through specific DCI fields

[0065] The base station can use DCI formats 0_0, 0_1, 0_2 to schedule the PUSCH to configure / indicate the dynamic waveform switching of the PUSCH. Typically, a new field can be created in the DCI and used for the purpose of configuring / indicating the dynamic waveform switching. However, since there may not be many reserved fields in the DCI, a specific DCI field previously used for another purpose can be configured to be reinterpreted for the purpose of configuring / indicating the dynamic waveform switching.

[0066] For example, the most significant bit (MSB) (or least significant bit (LSB)) N bits (e.g., N = 1) of the time domain resource allocation (TDRA) field, and / or modulation and coding scheme (MCS) field, and / or new data indicator field, and / or redundancy version field, and / or HARQ process number field, etc. can be configured for configuring / indicating the dynamic waveform switching.

[0067] Additionally, if the waveform is dynamically configured / indicated as CP-OFDM or DFT-s-OFDM by a specific position of a specific DCI field as described above, the following UE operations can be additionally considered.

[0068] First, according to the type of UL waveform dynamically configured / indicated by the base station through a specific DCI field, the set of values indicated by the specific DCI field or the table referred to by the values indicated by the specific DCI field can be set / defined differently. For example, if the UL waveform is configured / indicated as CP-OFDM, the table referred to by the MCS field can be Table X, and if the UL waveform is configured / indicated as DFT-s-OFDM, the table referred to by the MCS field can be Table Y. For another example, a set of beta offset values and / or a set of power control parameters can be individually set / defined as the reference values / tables for each waveform. Alternatively, although in a specific waveform 1, the beta offset value can be dynamically indicated via DCI as described above, a semi-static beta offset can be configured / applied without dynamic indication (i.e., 0 bit in DCI) for use in another waveform 2. For another example, the scaling factor (i.e., Alpha, α) that determines the maximum number of REs allowed for UCI mapping among the total number of REs in the PUSCH (e.g., the α value applied to the equation for determining the number of UCI REs, including the following Equation 1 included in Section 6.3.2.4 of TS 38.212) can also be individually set / defined as the value / table to be referred to for each waveform. Equation 1 is the α-related formula included in Section 6.3.2.4 of 3GPP TS 38.212.

[0069] [Equation 1]

[0070]

[0071] In this case, when the UL waveform is dynamically configured / indicated by 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.) by referring to the values / tables set for the corresponding UL waveform value when interpreting the specific DCI field B based on the configured / indicated UL waveform value.

[0072] For another example, based on whether the UL waveform is DFT-s-OFDM or CP-OFDM, the combination of information indicated by the TDRA field value can be configured to vary. That is, the combination of {k2, mappingType, startSymbolAndLength} indicated by the TDRA field value can vary according to the DMRS structure applicable to different UL waveforms. Therefore, if the UL waveform is DFT-s-OFDM, it can be configured to refer to Table X including the combination of information suitable for it, and if the UL waveform is CP-OFDM, it can be configured to refer to Table Y including the combination of information suitable for it.

[0073] Secondly, according to the type of UL waveform dynamically configured / indicated by the base station through a specific DCI field, the specific DCI field can be configured differently. For example, if the UL waveform is configured / indicated as CP-OFDM, the MCS field may include X bits (e.g., X = 5), and if the UL waveform is configured / indicated as DFT-s-OFDM, the MCS field may include Y bits (e.g., Y = 4). Alternatively, if the UL waveform is configured / indicated as CP-OFDM, the HARQ process number field may include X bits (e.g., X = 4), and if the UL waveform is configured / indicated as DFT-s-OFDM, the HARQ process number field may include Y bits (e.g., Y = 2). In this case, when the UL waveform is dynamically configured / indicated by a specific DCI field A (e.g., the HARQ process number field, etc.), the UE can be configured to use a predefined DCI field size based on the corresponding UL waveform value when interpreting a specific DCI field B (e.g., the MCS field, etc.) based on the configured / indicated UL waveform value.

[0074] In addition, depending on the UL waveform configured / indicated by the base station, the following DCI fields may also have different field configurations (e.g., field bit widths).

[0075] (1) Related to SRI: SRS resource set indicator and / or second SRS resource indicator

[0076] (1-1) Even if the UL waveform configured / indicated by the base station changes, a method of equally setting the bit width of the field can be considered through the following constraints, such as configuring / indicating to use non-codebook (NCB)-based transmission or codebook (CB)-based transmission, or jointly configuring / indicating the number of SRS resources, or jointly configuring / indicating the number of maximum ranks (max rank).

[0077] (1-2) Alternatively, if the bit width of the field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum among the possible bit widths.

[0078] (2) Transmission Precoding Matrix Indicator (TPMI) and Transmission Rank Indicator (TRI) related: Precoding information and number of layers & second precoding information

[0079] (2-1) If the bit width of the field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum among the possible bit widths.

[0080] (3) Antenna port field

[0081] (3-1) If the bit width of the field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum among the possible bit widths.

[0082] (4) DMRS sequence initialization field

[0083] (4-1) When applying the method of configuring the waveform via existing higher layer signaling, if the waveform is configured as DFT-s-OFDM, the field size is set to 0 bits, and if the waveform is configured as CP-OFDM, the field size is set to 1 bit. Additionally, if dynamic waveform switching is configured, it can be configured such that the field size is always fixed to 1 bit, and it can be configured such that the UE determines whether to interpret the 1-bit based on the actual dynamically configured / indicated UL waveform. In other words, if the base station dynamically configures the UL waveform as DFT-s-OFDM, the UE can be configured to ignore the 1-bit field, and if the base station dynamically configures the UL waveform as CP-OFDM, the UE can be configured to interpret the 1-bit field without ignoring it.

[0084] (4-2) Alternatively, if dynamic waveform switching is configured, it can be configured such that the field size is always fixed to 0 bits, the initialization method for the case where the base station dynamically configures the UL waveform as CP-OFDM can be configured / indicated via higher layer signaling, and the field size can be pre-fixed to a specific value among 0 and 1.

[0085] (5) PTRS-DMRS related (PTRS-DMRS association and second PTRS-DMRS association)

[0086] (5-1) Existing methods can set the number of bits to 0, 2, or 4 according to various conditions. Typically, if the UL waveform configured / indicated via higher layer signaling is DFT-s-OFDM or if the maximum rank is 1, the field size is 0 bits. Additionally, if dynamic waveform switching is configured, it can be configured such that the field size is always fixed to 0 bits, the association method for the case where the base station dynamically configures the UL waveform as CP-OFDM can be configured / indicated via higher layer signaling, and the field size can be pre-fixed to a specific value.

[0087] (5-2) Alternatively, if the bit width of a field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum value among the possible bit widths.

[0088] The present disclosure proposes a method of determining the bit width of a field as the maximum value among the bit widths that can be included when the bit width of the field varies for each UL waveform in the above configuration method. In this case, when dynamically configuring / indicating a UL waveform that only requires a relatively small bit width, the UE can be configured to interpret only the necessary number of bits starting from the MSB (or from the LSB) when interpreting the field. (That is, the unnecessary bits starting from the LSB (or from the MSB) are configured to be ignored.)

[0089] If each field size is configured to vary with the dynamic change of the waveform, one of the following alternative methods can be used to determine the field size.

[0090] (1) Alternative 1: A method of comparing the field size when the UL waveform for each field is CP-OFDM and the field size when the UL waveform for each field is DFT-s-OFDM and using the larger value of the two to determine the size of each field

[0091] (2) Alternative 2: A method of comparing the overall field size (or adding a specific number of multiple fields) when the UL waveform is CP-OFDM and the overall field size (or adding a specific number of multiple fields) when the UL waveform is DFT-s-OFDM and using the larger value of the two to determine the overall DCI field size (or the size of adding a specific number of multiple fields)

[0092] (2-1) For example, considering that fields A and B are grouped, when the size of each field when the UL waveform is configured / indicated as DFT-s-OFDM is a1 / b1, and the size of each field when the UL waveform is configured / indicated as CP-OFDM is a2 / b2, the sum of the two field sizes can be defined as max{a1 + b1, a2 + b2}.

[0093] As another way, it can be considered to also apply the DCI processing and / or UE interpretation method previously applied to BWP switching when the base station and the UE configure / indicate dynamic waveform switching. That is, in the case where the size of a specific field X is A bits when in a specific waveform 1 (e.g., CP-OFDM) and B bits when in a specific waveform 2 (e.g., DFT-s-OFDM), if the base station dynamically indicates a switch from waveform 1 to waveform 2 via DCI, the base station can indicate information related to waveform 2 with the size of field X in the DCI being A bits.

[0094] In this case, if A > B, the UE can be configured to read only the first B (MSB) bits within field X and interpret / apply them as waveform 2 information. Conversely, if A < B, the UE can be configured to add up to B - A bits of '0' in front of the A bits indicated by field X and interpret / apply it as B-bit information related to waveform 2.

[0095] Additionally, the enable / disable operation for dynamic waveform switching can be configured separately for each BWP. For example, dynamic waveform switching can be enabled in the first active UL BWP and disabled in the second active UL BWP. Thus, in the first active UL BWP, the base station can dynamically configure / indicate the UL waveform. On the other hand, in the second active UL BWP, the base station cannot dynamically configure / indicate the UL waveform, and existing methods (i.e., methods configured semi-statically via higher layer signaling) can be used to configure / indicate the UL waveform.

[0096] For this operation, a higher layer parameter indicating whether dynamic waveform switching is enabled or disabled can be configured to be provided separately for each UL BWP (i.e., the higher layer parameter is generated / indicated as many times as the number of UL BWPs set by the base station). Typically, if the base station does not send a higher layer parameter for a specific UL BWP or sends an empty higher layer parameter, the UE can be configured / defined to determine whether to enable / disable dynamic waveform switching in the corresponding UL BWP based on the information set by the higher layer parameter provided to the initial UL BWP (i.e., one of enable / disable).

[0097] Define a specific DCI format (e.g., DCI format 0_2, etc.) such that the base station can configure the size of each field constituting the DCI separately. To this end, if an explicit N-bit (e.g., N = 1) DCI field (into a specific DCI format (e.g., DCI format 0_2, etc.)) is introduced for dynamic waveform switching, a method can be considered where the base station (separately for each waveform) configures / defines the size of the specific (same) DCI field to have different (or the same) values according to different waveforms. Then, the UE can be configured to calculate / interpret the size of the specific DCI field suitable for the waveform configured / indicated by the explicit N-bit DCI field based on the information configured / defined by the base station, and receive (monitor) the DCI based on this.

[0098] When applying the proposed method, the base station configures / indicates the size of each field differently (or equivalently) based on different waveforms. Thus, even if different waveforms are configured / indicated, the total size of a specific DCI format can be made equal (or similar). Therefore, since the total DCI size is equal / similar even when different waveforms are applied, there is an advantage that the UE does not have to additionally perform the new operations proposed above. In addition, there is an advantage that the DCI overhead can be reduced by reducing the difference in the DCI payload sizes required between different waveforms.

[0099] A specific configuration method is proposed as follows. First, one method is to configure / define (individually for each waveform) the respective sizes of all DCI fields (which can be configured by the base station) that form a specific DCI format (e.g., DCI format 0_2) to have independent (e.g., different or the same) sizes based on different waveforms. That is, the base station can configure / indicate via higher layer signaling (e.g., UE-specific RRC signaling) the respective sizes of all DCI fields (which can be configured by the base station) of DCI format 0_2 to have independent (e.g., different or the same) values based on different waveforms. Then, the UE can be configured to receive the corresponding information (the size of each DCI field corresponding to each waveform), and select / interpret the appropriate DCI field size (set for the indicated waveform) according to which waveform is dynamically indicated by the base station to receive (monitor) the corresponding DCI. Typically, since different sizes can be set / indicated for all DCI fields, the amount of information provided by the base station can be large.

[0100] Second, one method is to configure / define (individually for each waveform) the sizes of specific some of the DCI fields (which can be configured by the base station) that form a specific DCI format (e.g., DCI format 0_2) to have independent (e.g., different or the same) sizes based on different waveforms, and equivalently configure / define the sizes of the remaining DCI fields (e.g., generally used for both waveforms) regardless of the waveform. That is, the base station can configure / indicate via higher layer signaling (e.g., UE-specific RRC signaling) (individually for each waveform) the sizes of specific some of the DCI fields of DCI format 0_2 to have independent (e.g., different or the same) values based on different waveforms, and can configure / define the sizes of the remaining DCI fields to have the same value regardless of the waveform. Then, the UE can be configured to receive the corresponding information (the size of each DCI field set individually for each waveform and / or the size of each DCI field set equivalently regardless of the waveform), and select / interpret the appropriate DCI field size (set for the indicated waveform) according to which waveform is dynamically indicated by the base station to receive (monitor) the corresponding DCI.

[0101] Method to pre - configure / pre - indicate waveforms as values indicated by specific DCI fields

[0102] As in the method proposed above, the base station can dynamically configure / indicate using specific fields of DCI formats 0_0, 0_1, and 0_2 for the waveform scheduling PUSCH. However, a method of configuring / indicating a specific waveform as a high-layer signaling value or table referenced by an existing defined DCI field value can also be considered.

[0103] In the first method, a specific UL waveform can be additionally configured / indicated to the information corresponding to each time-domain resource allocation (TDRA) field value configured / indicated by the base station via high-layer signaling. That is, the base station can provide k2, mappingType, and startSymbolAndLength information corresponding to each TDRA field value via high-layer signaling, and can additionally configure / indicate the UL waveform. Typically, a default UL waveform can be configured, and if the UL waveform value is not provided separately, it can be configured to follow the default UL waveform. The default UL waveform can be a value configured jointly by the base station via high-layer signaling for the cell, configured specifically for the BWP, or configured / indicated separately.

[0104] In the second method, a method of predefining UL waveform values to a specific MCS table can be considered. For example, when a specific MCS table is newly configured, a specific index can be configured to additionally specify UL waveform A (e.g., CP-OFDM), and another specific index can be configured to additionally specify UL waveform B (e.g., DFT-s-OFDM).

[0105] As another method, a method of pre-dividing the HARQ process number field value into two groups and pre-pairing UL waveforms for each group can be considered. For example, if the HARQ process number field is X bits and there are a total of 2 X HARQ IDs, then K (e.g., 0 to K-1) HARQ IDs can be defined to use UL waveform A (e.g., CP-OFDM), and 2 X -K (e.g., K to 2 X -1) HARQ IDs can be defined to use UL waveform B (e.g., DFT-s-OFDM). The UE can operate based on the value of the HARQ process number field to use the predefined UL waveform to transmit the PUSCH.

[0106] As another method, a method of mapping the UL waveform based on the information corresponding to each index of the TDRA table (i.e., based on the result of resource mapping) can be considered. For example, the UL waveform to be used can be pre-configured / pre-defined based on how many OFDM symbols have been 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 pre-know the UL waveform to be used according to how the TDRA information is configured / indicated / combined. If the base station actually sets the TDRA value through the DCI field, the UE can be configured to use the corresponding UL waveform to transmit the PUSCH.

[0107] As another method, a method of using different UL waveforms based on the number of PRBs configured / indicated through the FDRA field and / or the code rate value configured / indicated through the MCS field can be considered. For example, if the number of allocated PRBs is less than or equal to a specific number (pre-defined or configured / indicated by the base station) and / or the MCS index with a code rate less than or equal to a specific value is set, it can be configured to use waveform A (e.g., DFT-s-OFDM). Conversely, if the number of allocated PRBs is greater than or equal to a specific number and / or the MCS index with a code rate greater than or equal to a specific value is set, it can be configured to use waveform B (e.g., CP-OFDM). The UE can check the set value of the FDRA field and / or the set value of the MCS field (or a combination of the above field values) and use the corresponding UL waveform to transmit the PUSCH.

[0108] Method of indication through aggregation level and CCE index

[0109] In addition, instead of dynamically setting / indicating the waveform through the DCI field, using the aggregation level value of the PDCCH on which the UL grant is sent and / or the CCE index value to dynamically configure / indicate the UL waveform can be considered. That is, if the UL waveform is pre-paired with the aggregation level value (or CCE index value) and the base station uses a specific aggregation level (or a specific CCE index value), the UE can interpret it as configuring / indicating the paired UL waveform. For example, if aggregation levels 1, 2, and 4 are used, it can be defined to use waveform A (e.g., CP-OFDM), and if aggregation levels 8 and 16 are used, it can be defined to use waveform B (e.g., DFT-s-OFDM). As another example, if the (lowest or highest) CCE index is greater than or equal to K or the (lowest or highest) CCE index is even, it can be defined to use waveform A (e.g., CP-OFDM), and if the (lowest or highest) CCE index is less than K or the (lowest or highest) CCE index is odd, it can be defined to use waveform B (e.g., DFT-s-OFDM).

[0110] Method to determine whether to use dynamic waveform switching through the value of a specific DCI field

[0111] A method can be considered in which a base station uses the value of a specific DCI field to notify a UE whether to use dynamic waveform switching operation. As a first method, it can be determined whether to use dynamic waveform switching operation based on the value of the HARQ process number field and whether it is an initial transmission / retransmission. For example, dynamic waveform switching operation may not be used when performing an initial transmission using a specific HARQ ID, and may be configured to use dynamic waveform switching operation when indicating retransmission using the same HARQ ID. The UE can interpret the DCI field by understanding that dynamic waveform switching operation is not used when performing an initial transmission using a specific HARQ ID, and can interpret the DCI field by understanding that dynamic waveform switching operation is used when indicating retransmission using the same HARQ ID.

[0112] In this case, when the UL waveform is dynamically configured / indicated by 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.) by referring to the value / table set for the corresponding UL waveform value when interpreting the specific DCI field B.

[0113] For another example, based on whether the UL waveform is DFT-s-OFDM or CP-OFDM, the combination of information indicated by the TDRA field value can be configured to vary. That is, the combination of {k2, mappingType, startSymbolAndLength} indicated by the TDRA field value can vary according to the DMRS structure applicable to different UL waveforms. Therefore, if the UL waveform is DFT-s-OFDM, it can be configured to refer to Table X including the combination of information suitable for it, and if the UL waveform is CP-OFDM, it can be configured to refer to Table Y including the combination of information suitable for it.

[0114] Second, depending on the type of UL waveform dynamically configured / indicated by the base station through a specific DCI field, the specific DCI field can be configured differently. For example, if the UL waveform is configured / indicated as CP-OFDM, the MCS field may include X bits (e.g., X = 5), and if the UL waveform is configured / indicated as DFT-s-OFDM, the MCS field may include Y bits (e.g., Y = 4). Alternatively, if the UL waveform is configured / indicated as CP-OFDM, the HARQ process number field may include X bits (e.g., X = 4), and if the UL waveform is configured / indicated as DFT-s-OFDM, the HARQ process number field may include Y bits (e.g., Y = 2). In this case, when the UL waveform is dynamically configured / indicated by a specific DCI field A (e.g., the HARQ process number field, etc.), the UE can be configured to use a predefined DCI field size based on the corresponding UL waveform value when interpreting a specific DCI field B (e.g., the MCS field, etc.) based on the configured / indicated UL waveform value.

[0115] In addition, depending on the UL waveform configured / indicated by the base station, the following DCI fields may also have different field configurations (e.g., field bit widths).

[0116] (1) Related to SRI: SRS resource set indicator and / or second SRS resource indicator

[0117] (1-1) Even when the UL waveform configured / indicated by the base station changes, a method of equally setting the bit width of the field can be considered through the following restrictions, such as configuring / indicating the use of non-codebook (NCB)-based transmission or codebook (CB)-based transmission, or jointly configuring / indicating the number of SRS resources, or jointly configuring / indicating the number of maximum ranks.

[0118] (1-2) Alternatively, if the bit width of the field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum value among the possible bit widths.

[0119] (2) Related to transmit precoding matrix indicator (TPMI) and transmit rank indicator (TRI): Precoding information and number of layers & second precoding information

[0120] (2-1) If the bit width of the field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum value among the possible bit widths.

[0121] (3) Antenna port field

[0122] (3-1) If the bit width of a field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum value among the possible bit widths.

[0123] (4) DMRS sequence initialization field

[0124] (4-1) When applying the method of configuring waveforms via existing higher-layer signaling, if the waveform is configured as DFT-s-OFDM, the field size is set to 0 bits, and if the waveform is configured as CP-OFDM, the field size is set to 1 bit. Additionally, if dynamic waveform switching is configured, it can be configured such that the field size is always fixed to 1 bit, and it can be configured such that the UE determines whether to interpret the 1-bit based on the actual dynamically configured / indicated UL waveform. In other words, if the base station dynamically configures the UL waveform as DFT-s-OFDM, the UE can be configured to ignore the 1-bit field, and if the base station dynamically configures the UL waveform as CP-OFDM, the UE can be configured to interpret the 1-bit field without ignoring it.

[0125] (4-2) Alternatively, if dynamic waveform switching is configured, it can be configured such that the field size is always fixed to 0 bits, the initialization method for the case where the base station dynamically configures the UL waveform as CP-OFDM via higher-layer signaling configuration / indication, and the field size is pre-fixed to a specific value among 0 and 1.

[0126] (5) PTRS-DMRS related (PTRS-DMRS association and second PTRS-DMRS association)

[0127] (5-1) Existing methods can set the number of bits to 0, 2, or 4 according to various conditions. Typically, if the UL waveform configured / indicated via higher-layer signaling is DFT-s-OFDM or if the maximum rank is 1, the field size is 0 bits. Additionally, if dynamic waveform switching is configured, it can be configured such that the field size is always fixed to 0 bits, the association method for the case where the base station dynamically configures the UL waveform as CP-OFDM via higher-layer signaling configuration / indication, and the field size is pre-fixed to a specific value.

[0128] (5-2) Alternatively, if the bit width of a field varies for each UL waveform, it can be configured such that the bit width of the field is determined as the maximum value among the possible bit widths.

[0129] The present disclosure proposes a method in the above configuration method of determining the bit width of a field as the maximum value among the bit widths that can be included when the bit width of the field varies for each UL waveform. In this case, when a UL waveform that only requires a relatively small bit width is dynamically configured / indicated, the UE can be configured to interpret only the necessary number of bits starting from the MSB (or from the LSB) when interpreting the field. (That is, the unnecessary bits starting from the LSB (or from the MSB) are configured to be ignored.)

[0130] If each field size is configured to vary with the dynamic change of the waveform, one of the following alternative methods can be used to determine the field size.

[0131] (1) Alternative 1: A method of comparing the field size when the UL waveform for each field is CP-OFDM with the field size when the UL waveform for each field is DFT-s-OFDM and using the larger of the two to determine the size of each field

[0132] (2) Alternative 2: A method of comparing the overall field size (or adding a specific number of multiple fields) when the UL waveform is CP-OFDM with the overall field size (or adding a specific number of multiple fields) when the UL waveform is DFT-s-OFDM and using the larger of the two to determine the overall DCI field size (or the size of adding a specific number of multiple fields)

[0133] (2-1) For example, considering that fields A and B are grouped, when the size of each field when the UL waveform is configured / indicated as DFT-s-OFDM is a1 / b1, and the size of each field when the UL waveform is configured / indicated as CP-OFDM is a2 / b2, the sum of the two field sizes can be defined as max{a1 + b1, a2 + b2}.

[0134] As another method, it can be considered to also apply the DCI processing and / or UE interpretation method previously applied to BWP switching when the base station and the UE configure / indicate dynamic waveform switching. That is, in the case where the size of a specific field X is A bits when in a specific waveform 1 (e.g., CP-OFDM) and B bits when in a specific waveform 2 (e.g., DFT-s-OFDM), if the base station dynamically indicates a switch from waveform 1 to waveform 2 via DCI, the base station can indicate information related to waveform 2 with the size of field X in the DCI being A bits.

[0135] In this case, if A > B, the UE can be configured to read only the first (MSB) B bits within field X and interpret / apply them as waveform 2 information. Conversely, if A < B, the UE can be configured to add up to B - A bits of "0" in front of the A bits indicated by field X and interpret / apply it as B-bit information related to waveform 2.

[0136] Additionally, the enable / disable operation for dynamic waveform switching can be configured separately for each BWP. For example, dynamic waveform switching can be enabled in the first active UL BWP and disabled in the second active UL BWP. Thus, in the first active UL BWP, the base station can dynamically configure / indicate the UL waveform. On the other hand, in the second active UL BWP, the base station cannot dynamically configure / indicate the UL waveform, and an existing method (i.e., a method configured semi-statically via higher layer signaling) can be used to configure / indicate the UL waveform.

[0137] For this operation, a higher layer parameter indicating whether dynamic waveform switching is enabled or disabled can be configured to be provided separately for each UL BWP (i.e., the higher layer parameter is generated / indicated as many times as the number of UL BWPs set by the base station). Typically, if the base station does not send a higher layer parameter for a specific UL BWP or sends an empty higher layer parameter, the UE can be configured / defined to determine whether to enable / disable dynamic waveform switching in the corresponding UL BWP based on the information set by the higher layer parameter provided to the initial UL BWP (i.e., one of enable / disable).

[0138] Define a specific DCI format (e.g., DCI format 0_2, etc.) such that the base station can configure the size of each field constituting the DCI separately. For this purpose, if an explicit N-bit (e.g., N = 1) DCI field (into a specific DCI format (e.g., DCI format 0_2, etc.)) is introduced for dynamic waveform switching, a method can be considered where the base station (separately for each waveform) configures / defines the size of the specific (same) DCI field to have different (or the same) values according to different waveforms. Thereafter, the UE can be configured to calculate / interpret the size of the specific DCI field suitable for the waveform configured / indicated by the explicit N-bit DCI field based on the information configured / defined by the base station, and receive (monitor) the DCI based on this.

[0139] When applying the proposed method, the base station configures / indicates each field size differently (or equally) based on different waveforms. Thus, even if different waveforms are configured / indicated, the total size of a specific DCI format can be made equal (or similar). Therefore, since the total DCI size is equal / similar even when different waveforms are applied, there is an advantage that the UE does not have to additionally perform the new operations proposed above. In addition, there is an advantage that the DCI overhead can be reduced by reducing the difference in the DCI payload sizes required between different waveforms.

[0140] A specific configuration method is proposed as follows. First, one method is to configure / define (individually for each waveform) the corresponding sizes of all DCI fields (which can be configured by the base station) that form a specific DCI format (e.g., DCI format 0_2) to have independent (e.g., different or the same) sizes based on different waveforms. That is, the base station can configure / indicate (which can be configured by the base station) the corresponding sizes of all DCI fields of DCI format 0_2 via higher layer signaling (e.g., UE-specific RRC signaling) to have independent (e.g., different or the same) values based on different waveforms. Then, the UE can be configured to receive the corresponding information (the size of each DCI field corresponding to each waveform), and select / interpret the appropriate DCI field size (set for the indicated waveform) to receive (monitor) the corresponding DCI according to which waveform is dynamically indicated by the base station. Typically, since different sizes can be set / indicated for all DCI fields, the amount of information provided by the base station may be large.

[0141] Second, one method is to configure / define (individually for each waveform) the sizes of specific some DCI fields (which can be configured by the base station) that form a specific DCI format (e.g., DCI format 0_2) to have independent (e.g., different or the same) sizes based on different waveforms, and configure / define the sizes of the remaining DCI fields (e.g., common to both waveforms) equally regardless of the waveform. That is, the base station can configure / indicate (individually for each waveform) the sizes of specific some DCI fields of DCI format 0_2 via higher layer signaling (e.g., UE-specific RRC signaling) to have independent (e.g., different or the same) values based on different waveforms, and can configure / define the sizes of the remaining DCI fields to have the same value regardless of the waveform. Then, the UE can be configured to receive the corresponding information (the size of each DCI field set individually for each waveform and / or the size set equally for each DCI field regardless of the waveform), and select / interpret the appropriate DCI field size (set for the indicated waveform) to receive (monitor) the corresponding DCI according to which waveform is dynamically indicated by the base station.

[0142] Method to pre - configure / pre - indicate waveforms as values indicated by specific DCI fields

[0143] As in the method proposed above, the base station can use specific fields of DCI formats 0_0, 0_1, and 0_2 for scheduling PUSCH to dynamically configure / indicate the waveform. However, a method of configuring / indicating a specific waveform to a higher-layer signaling value or table referenced by the existing defined DCI field value can also be considered.

[0144] In the first method, a specific UL waveform can be additionally configured / indicated via higher-layer signaling to information corresponding to each time-domain resource allocation (TDRA) field value configured / indicated by the base station. That is, the base station can provide k2, mappingType, and startSymbolAndLength information corresponding to each TDRA field value via higher-layer signaling and can additionally configure / indicate the UL waveform. Typically, a default UL waveform can be configured, and if the UL waveform value is not provided separately, it can be configured to follow the default UL waveform. The default UL waveform can be a value configured by the base station via higher-layer signaling cell-common, BWP-specific configuration, or separately configured / indicated.

[0145] In the second method, a method of predefining UL waveform values to a specific MCS table can be considered. For example, when a specific MCS table is newly configured, a specific index can be configured to additionally specify UL waveform A (e.g., CP-OFDM) and another specific index can be configured to additionally specify UL waveform B (e.g., DFT-s-OFDM).

[0146] As another method, a method of pre-partitioning the HARQ process number field value into two groups and pre-pairing UL waveforms for each group can be considered. For example, if the HARQ process number field is X bits and there are a total of 2 X HARQ IDs, K (e.g., 0 to K-1) HARQ IDs can be defined to use UL waveform A (e.g., CP-OFDM), and 2 X -K (e.g., K to 2 X -1) HARQ IDs can be defined to use UL waveform B (e.g., DFT-s-OFDM). The UE can operate based on the value of the HARQ process number field to use the predefined UL waveform to transmit PUSCH.

[0147] As another method, a method of mapping the UL waveform based on information corresponding to each index of the TDRA table (i.e., based on the result of resource mapping) can be considered. For example, the UL waveform to be used can be pre-configured / pre-defined based on how many OFDM symbols have been 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 pre-know the UL waveform to be used according to how the TDRA information is configured / indicated / combined. If the base station actually sets the TDRA value through the DCI field, the UE can be configured to use the corresponding UL waveform to transmit the PUSCH.

[0148] As another method, a method of using different UL waveforms based on the number of PRBs configured / indicated through the FDRA field and / or the coding rate value configured / indicated through the MCS field can be considered. For example, if the number of allocated PRBs is less than or equal to a specific number (pre-defined or configured / indicated by the base station) and / or the MCS index with a coding rate less than or equal to a specific coding rate is set, it can be configured to use waveform A (e.g., DFT-s-OFDM). Conversely, if the number of allocated PRBs is greater than or equal to a specific number and / or the MCS index with a coding rate greater than or equal to a specific coding rate is set, it can be configured to use waveform B (e.g., CP-OFDM). The UE can check the set value of the FDRA field and / or the set value of the MCS field (or a combination of the above field values) and use the corresponding UL waveform to transmit the PUSCH.

[0149] Method of indication through aggregation level and CCE index

[0150] Alternatively, instead of dynamically setting / indicating the waveform through the DCI field, using the aggregation level value of the PDCCH that sends the UL grant and / or the CCE index value to dynamically configure / indicate the UL waveform can be considered. That is, if the UL waveform is pre-paired with the aggregation level value (or CCE index value) and the base station uses a specific aggregation level (or a specific CCE index value), the UE can interpret that the paired UL waveform is configured / indicated. For example, if aggregation levels 1, 2, and 4 are used, it can be defined such that waveform A (e.g., CP-OFDM) is used, and if aggregation levels 8 and 16 are used, it can be defined such 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 the (lowest or highest) CCE index is even, it can be defined such that waveform A (e.g., CP-OFDM) is used, and if the (lowest or highest) CCE index is less than K or the (lowest or highest) CCE index is odd, it can be defined such that waveform B (e.g., DFT-s-OFDM) is used.

[0151] Method to determine whether to use dynamic waveform switching through the value of a specific DCI field

[0152] A method can be considered in which a base station uses the value of a specific DCI field to notify a UE whether to use dynamic waveform switching operation. As a first method, it can be determined whether to use dynamic waveform switching operation based on the value of the HARQ process number field and whether it is an initial transmission / retransmission. For example, dynamic waveform switching operation may not be used when an initial transmission is performed using a specific HARQ ID, and it may be configured to use dynamic waveform switching operation when a retransmission is indicated using the same HARQ ID. The UE can interpret the DCI field by understanding that dynamic waveform switching operation is not used when an initial transmission is performed using a specific HARQ ID, and can interpret the DCI field by understanding that dynamic waveform switching operation is used when a retransmission is indicated using the same HARQ ID.

[0153] As another method, it can be determined whether to use dynamic waveform switching operation based on the HARQ process number field value. For example, if the HARQ process number field is X bits and there are a total of 2 X HARQ IDs, then K (e.g., 0 to K-1) HARQ IDs can be configured not to allow dynamic waveform switching operation, and 2 X -K (e.g., K to 2 X -1) HARQ IDs can be configured to allow dynamic waveform switching operation. If a HARQ ID that allows dynamic waveform switching operation is configured / indicated as described above, it can be configured for the UE to determine which of UL waveform A (e.g., CP-OFDM) or UL waveform B (e.g., DTS-s-OFDM) has been used based on the configuration / indication of another DCI field and use it for PUSCH transmission.

[0154] The proposed method can be configured / applied to other UL signals / channels, such as, MSG3 PUSCH, MSGA preamble / PUSCH, and / or PUSCH / PUCCH. In addition, since the examples of the proposed method above can also be included as an implementation of the present disclosure, it is obvious that they can be considered a proposed method. In addition, the proposed method above can be implemented alone, but can also be implemented in the form of a combination (or merger) of some proposed methods. Information about whether to apply the proposed method (or information about the rules of the proposed method) can be defined as a rule such that the base station notifies the UE of this information via a predefined signal (e.g., a physical layer signal or a high layer signal). For example, the high layer can include one or more of the functional layers such as MAC, RLC, PDCP, RRC, and SDAP.

[0155] [Description of claims related to UE]

[0156] Next, with reference to Figure 5 The above-described embodiments will be described in detail from the perspective of the operations of the UE. The methods described below are merely distinguished for ease of explanation. Thus, it is obvious that as long as the methods are not mutually exclusive, partial configurations of any method can be substituted or combined with partial configurations of another method.

[0157] Figure 5 An example of the operation procedure of the UE applicable to the system of the present disclosure is shown.

[0158] In step S510, the UE receives an indication of the uplink waveform for discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) from a base station (BS).

[0159] In step S520, the UE determines a DMRS sequence for demodulation reference signal (DMRS) symbol transmission among computer-generated sequences (CGS) and Zadoff-Chu (ZC) sequences.

[0160] In step S530, the UE determines the length of the DMRS sequence based on the number of all allocated physical resource blocks (PRBs) including a first PRB for tone reservation and a second PRB not for tone reservation.

[0161] In step S540, the UE performs DMRS symbol transmission using the DMRS sequence based on the determined length.

[0162] In step S550, the UE transmits a physical uplink shared channel (PUSCH) based on DFT-s-OFDM using the second PRB.

[0163] According to various embodiments of the present disclosure, the operation procedure may further include receiving an indication message from the base station regarding the number and position of the first PRBs for tone reservation.

[0164] According to various embodiments of the present disclosure, the DMRS sequence may be based on a base sequence using the largest prime number less than or equal to N as the base sequence index. N may be the number of resource elements (REs) occupied by all allocated PRBs.

[0165] According to various embodiments of the present disclosure, the length of the DMRS sequence may be adjusted using a cyclic shift for the base sequence such that the length of the DMRS sequence is equal to the number of REs for all allocated PRBs.

[0166] According to various embodiments of the present disclosure, the CGS and ZC sequences may be sequences among the selectable sequences having a low peak-to-average power ratio (PAPR).

[0167] According to various embodiments of the present disclosure, a DMRS sequence may be associated with all PRBs. A PUSCH may be associated with a second PRB.

[0168] According to various embodiments of the present disclosure, the length of a DMRS sequence may be determined regardless of multiples of 2, 3, and 5.

[0169] According to various embodiments of the present disclosure, a user equipment (UE) in a wireless communication system is provided. The UE may include a transceiver and at least one processor, wherein the at least one processor may be configured to perform an operation method of the UE based on Figure 5 of the UE.

[0170] According to various embodiments of the present disclosure, an apparatus for controlling a user equipment (UE) in a wireless communication system is provided. The apparatus may include at least one processor and at least one memory operably connected to the at least one processor. The at least one memory may be configured to store instructions for performing an operation method of the UE based on being executed by the at least one processor to perform based on Figure 5 of the UE.

[0171] According to various embodiments of the present disclosure, one or more non-transitory computer-readable media (CRMs) storing one or more instructions are provided. The one or more instructions may be configured to perform operations based on being executed by one or more processors, and the operations may include an operation method of the UE based on Figure 5 of the UE.

[0172] [Description of claims related to the BS]

[0173] Next, with reference to Figure 6 the above embodiments will be described in detail from the perspective of the operation of the base station. The methods described below are merely distinguished for ease of explanation. Therefore, it is obvious that as long as the methods are not mutually exclusive, partial configurations of any method may be replaced or combined with partial configurations of another method.

[0174] Figure 6 An example of an operation procedure of a base station in a system applicable to the present disclosure is shown.

[0175] In step S610, the base station transmits an indication for an uplink waveform of discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) to a user equipment (UE). A demodulation reference signal (DMRS) sequence may be determined from among a computer-generated sequence (CGS) and a Zadoff-Chu (ZC) sequence. The length of the DMRS sequence may be determined based on the number of all allocated physical resource blocks (PRBs) including a first PRB for tone reservation and a second PRB not for tone reservation.

[0176] In step S620, the base station receives DMRS symbols using a DMRS sequence based on the determined length.

[0177] In step S630, the base station receives a DFT-s-OFDM-based physical uplink shared channel (PUSCH) using a second PRB.

[0178] According to various embodiments of the present disclosure, the operation procedure may further include sending an indication message to the UE regarding the number and position of the first PRBs for tone reservation.

[0179] According to various embodiments of the present disclosure, the DMRS sequence may be based on a base sequence using the largest prime number less than or equal to N as the base sequence index. N may be the number of resource elements (REs) occupied by all allocated PRBs.

[0180] According to various embodiments of the present disclosure, the length of the DMRS sequence may be adjusted using a cyclic shift for the base sequence such that the length of the DMRS sequence is equal to the number of REs for all allocated PRBs.

[0181] According to various embodiments of the present disclosure, the CGS and ZC sequences may be sequences having a low peak-to-average power ratio (PAPR) among the selectable sequences.

[0182] According to various embodiments of the present disclosure, the DMRS sequence may be associated with all PRBs. The PUSCH may be associated with a second PRB.

[0183] According to various embodiments of the present disclosure, the length of the DMRS sequence may be determined regardless of multiples of 2, 3, and 5.

[0184] According to various embodiments of the present disclosure, a base station in a wireless communication system is provided. The base station may include a transceiver and at least one processor, and the at least one processor may be configured to perform operations of the BS based on Figure 6 the method.

[0185] According to various embodiments of the present disclosure, a device for controlling a base station in a wireless communication system is provided. The device may include at least one processor and at least one memory operatively connected to the at least one processor. The at least one memory may be configured to store instructions for performing operations of the BS based on Figure 6 the method executed by the at least one processor.

[0186] According to various embodiments of the present disclosure, one or more non-transitory computer-readable media (CRMs) storing one or more instructions are provided. The one or more instructions may be configured to perform operations based on being executed by one or more processors, and the operations may include based on Figure 6 The operation method of the BS.

[0187] Wireless device applicable to the present disclosure

[0188] Examples of wireless devices to which various embodiments of the present disclosure are applied are described below.

[0189] Figure 7 An example of the structure of a first device and a second device applicable to the system of the present disclosure is shown.

[0190] The first device 1600 may include a processor 1610, an antenna unit 1620, a transceiver 1630, and a memory 1640.

[0191] The processor 1610 may perform signal processing related to the baseband and include a high-layer processing unit 1611 and a physical-layer processing unit 1615. The high-layer processing unit 1611 may process operations of the MAC layer, the RRC layer, or high 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 (BS) device in BS-UE communication, the physical-layer processing unit 1615 may perform uplink received signal processing, downlink transmitted signal processing, etc. For example, if the first device 1600 is a first UE device in UE-to-UE communication, the physical-layer processing unit 1615 may perform downlink received signal processing, uplink transmitted signal processing, sidelink transmitted 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.

[0192] The antenna unit 1620 may include one or more physical antennas, and if the antenna unit 1620 includes multiple antennas, MIMO transmission / reception is supported. The transceiver 1630 may include a radio frequency (RF) transmitter and an RF receiver. The memory 1640 may store information processed by the processor 1610 and software, an operating system, and applications related to the operation of the first device 1600. The memory 1640 may also include components such as buffers.

[0193] In the embodiments described in the present disclosure, the processor 1610 of the first device 1600 may be configured to implement the operation of the BS in BS-UE communication (or the operation of the first UE device in UE-to-UE communication).

[0194] The second device 1650 may include a processor 1660, an antenna unit 1670, a transceiver 1680, and a memory 1690.

[0195] The processor 1660 may perform signal processing related to the baseband and includes a high-layer processing unit 1661 and a physical-layer processing unit 1665. The high-layer processing unit 1661 may process operations of the MAC layer, RRC layer, or high layers. The physical-layer processing unit 1665 may process operations of the PHY layer. For example, if the second device 1650 is a UE device in BS-UE communication, the physical-layer processing unit 1665 may perform downlink received signal processing, uplink transmitted signal processing, etc. For example, if the second device 1650 is the second UE device in UE-to-UE communication, the physical-layer processing unit 1665 may perform downlink received signal processing, uplink transmitted signal processing, sidelink received 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.

[0196] The antenna unit 1670 may include one or more physical antennas and support MIMO transmission / reception if the antenna unit 1670 includes multiple antennas. The transceiver 1680 may include an RF transmitter and an RF receiver. The memory 1690 may store information processed by the processor 1660 and software, an operating system, and applications related to the operation of the second device 1650. The memory 1690 may also include components such as buffers.

[0197] In the embodiments described in this disclosure, the processor 1660 of the second device 1650 may be configured to implement the operation of the UE in BS-UE communication (or the operation of the second UE device in UE-to-UE communication).

[0198] The descriptions in the examples of this disclosure for the BS and UE in BS-UE communication (or the first UE device and the second UE device in UE-to-UE communication) may be equivalently applied to the operations of the first device 1600 and the second device 1650, and redundant descriptions are omitted.

[0199] The wireless communication technologies implemented in the devices 1600 and 1650 according to this disclosure may include LTE, NR, and 6G, as well as various other wireless communication technologies.

[0200] The claims described in various embodiments of the present disclosure can be combined in various ways. For example, the technical features of the method claims of various embodiments of the present disclosure can be combined and implemented as a device, and the technical features of the device claims of various embodiments of the present disclosure can be combined and implemented as a method. In addition, the technical features of the method claims and the technical features of the device claims in various embodiments of the present disclosure can be combined and implemented as a device, and the technical features of the method claims and the technical features of the device claims in various embodiments of the present disclosure can be combined and implemented as a method.

Claims

1. A method for operating a user equipment (UE) in a wireless communication system, the method comprising: Receiving downlink control information (DCI) related to a dynamic indication for one of a first waveform or a second waveform from a base station (BS); Determining a bit width of each field within the DCI as a maximum value between the first bit width for the first waveform and the second bit width for the second waveform, based on that the first bit width for the first waveform and the second bit width for the second waveform are different for each field within the DCI; Based on the DCI indicating the first waveform and determining the second bit width for each field, decoding only the least significant bits (LSBs) corresponding to the quantity of the first bit width for each field; And Performing an uplink transmission based on the determined waveform.

2. The method according to claim 1, the method further comprising: Based on the DCI indicating the first waveform, determining the second bit width for each field, and the quantity corresponding to the first bit width being 0, ignoring each field.

3. The method according to claim 1, wherein The DCI is related to DCI format 0_1 or DCI format 0_2.

4. The method according to claim 1, wherein The first waveform is cyclic prefix - orthogonal frequency division multiplexing (CP - OFDM), and the second waveform is discrete Fourier transform - spread - orthogonal frequency division multiplexing (DFT - s - OFDM), or wherein the first waveform is the DFT - s - OFDM, and the second waveform is the CP - OFDM.

5. The method according to claim 1, the method further comprising: For all fields within the DCI, based on that a third bit width which is a sum of bit widths of all fields for the first waveform is different from a fourth bit width which is a sum of bit widths of all fields for the second waveform, determining the bit width of all fields as a maximum value between the third bit width and the fourth bit width.

6. The method according to claim 1, wherein Based on that the first bit width for the first waveform and the second bit width for the second waveform are different for each field within the DCI, and Based on receiving a second DCI indicating a waveform switch to the second waveform after the DCI indicates the first waveform and the first bit width is applied to each field within the DCI, Each field within the second DCI is configured to allow decoding of information related to the second waveform based on the first bit width.

7. The method according to claim 6, the method further comprising: Based on the first bit width being greater than the second bit width, decoding only the most significant bits (MSBs) corresponding to the quantity of the second bit width for each field within the second DCI; And Based on the first bit width being less than the second bit width, decoding each field within the second DCI by adding a quantity of '0's corresponding to a difference between the first bit width and the second bit width in front of each field within the second DCI.

8. A method for operating a base station (BS) in a wireless communication system, the method comprising: Sending downlink control information (DCI) related to a dynamic indication for one of a first waveform or a second waveform to a user equipment (UE), Wherein, based on the first bit width for the first waveform and the second bit width for the second waveform being different for each field within the DCI, the bit width of each field is determined as the maximum value between the first bit width and the second bit width. Wherein, based on the first waveform being indicated by the DCI and the second bit width being determined for each field, only the least significant bits (LSBs) corresponding to the quantity of the first bit width for each field are decoded; and Uplink reception is performed based on the determined waveform.

9. The method according to claim 8, wherein Based on the first waveform being indicated by the DCI, the second bit width being determined for each field, and the quantity corresponding to the first bit width being 0, each field is ignored.

10. The method according to claim 8, wherein, The DCI is associated with DCI format 0_1 or DCI format 0_2.

11. The method according to claim 8, wherein, The first waveform is cyclic prefix - orthogonal frequency division multiplexing (CP - OFDM), and the second waveform is discrete Fourier transform - spread - orthogonal frequency division multiplexing (DFT - s - OFDM), or Wherein, the first waveform is the DFT - s - OFDM, and the second waveform is the CP - OFDM.

12. The method according to claim 8, wherein, For all fields within the DCI, based on the third bit width, which is the sum of the bit widths of all fields for the first waveform, being different from the fourth bit width, which is the sum of the bit widths of all fields for the second waveform, the bit width of all fields is determined as the maximum value between the third bit width and the fourth bit width.

13. The method according to claim 8, wherein Based on the first bit width for the first waveform and the second bit width for the second waveform being different for each field within the DCI, and Based on, after the first waveform is indicated by the DCI and the first bit width is applied to each field within the DCI, a second DCI for indicating a waveform switch to the second waveform is sent, Each field within the second DCI is configured to allow decoding of information related to the second waveform based on the first bit width.

14. The method according to claim 13, wherein, Based on the first bit width being greater than the second bit width, only the most significant bits (MSBs) corresponding to the quantity of the second bit width for each field within the DCI are decoded; And Wherein, based on the first bit width being less than the second bit width, each field within the second DCI is decoded by adding a quantity of '0' corresponding to the difference between the first bit width and the second bit width in front of each field within the second DCI.

15. A user equipment (UE) in a wireless communication system, the UE comprising: A transceiver; At least one processor; And At least one memory, the at least one memory being operatively connected to the at least one processor and configured to store instructions for performing operations based on execution by the at least one processor, Wherein, the operations include all steps of the method according to any one of claims 1 to 7.

16. A base station in a wireless communication system, the base station comprising: A transceiver; At least one processor; And at least one memory, the at least one memory being operatively connectable to the at least one processor and configured to store instructions for performing operations based on execution by the at least one processor, wherein the operations include all steps of the method according to any one of claims 8 to 14.

17. A control device that controls a user equipment in a wireless communication system, the control device comprising: at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor, wherein the at least one memory is configured to store instructions for performing operations based on execution by the at least one processor, and wherein the operations include all steps of the method according to any one of claims 1 to 7.

18. A control device that controls a base station in a wireless communication system, the control device comprising: at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor, wherein the at least one memory is configured to store instructions for performing operations based on execution by the at least one processor, and wherein the operations include all steps of the method according to any one of claims 8 to 14.

19. One or more non-transitory computer-readable media storing one or more instructions, Among them, the one or more instructions being configured to perform operations based on execution by one or more processors, and 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, Among them, the one or more instructions being configured to perform operations based on execution by one or more processors, and wherein the operations include all steps of the method according to any one of claims 8 to 14.

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