Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure includes: a reception unit that receives information associated with a frequency domain orthogonal cover code (FD-OCC) and receives an antenna port field, said FD-OCC being one of a first FD-OCC with a length of two and a second FD-OCC with a length longer than 2; and a control unit that uses the information as a basis to determine a parameter using a first association between the value of the antenna port field and the parameter or a second association between the value and the parameter. This aspect of the present disclosure makes it possible to use an appropriate number of DMRS ports.

Description

[Technical Field]

[0001] This disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems. 、 base station and system Regarding. [Background technology]

[0002] Long Term Evolution (LTE) was specified for Universal Mobile Telecommunications System (UMTS) networks with the aim of achieving even higher data rates and lower latency (Non-Patent Literature 1). Furthermore, LTE-Advanced (3GPP Rel.10-14) was specified for the aim of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP®) Release (Rel.) 8, 9).

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

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Future wireless communication systems (e.g., NR) incorporate beam management techniques. For example, in NR, beam formation (or utilization) is being considered at least one of the base station and the user terminal (User Equipment (UE)).

[0006] On the other hand, multiple port reference signals (e.g., demodulation reference signals (DMRS)) are used for purposes such as orthogonalization of layers. Future wireless communication systems will require an increase in the number of DMRS ports compared to existing specifications. However, how to increase the number of DMRS ports has not yet been thoroughly investigated. If an appropriate number of DMRS ports cannot be used, communication throughput and communication quality may deteriorate.

[0007] Therefore, this disclosure relates to a terminal that uses an appropriate number of DMRS ports, and a wireless communication method. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure provides a cyclic shift {0,π / 2,π,3π / 2} of length 4 to the demodulation reference signal (DMRS) of the physical uplink sharing channel (PUSCH). Second A transmitter unit that transmits capability information indicating support for the application of frequency domain orthogonal cover codes (FD-OCC), A receiving unit that receives a radio resource control (RRC) parameter indicating whether to use a table of first DMRS ports corresponding to a first FD-OCC of length 2 or a table of second DMRS ports corresponding to the second FD-OCC, and downlink control information (DCI) indicating whether to use the first FD-OCC or the second FD-OCC, and when the second FD-OCC is indicated by the combination of the RRC parameter and the DCI, The DMRS of the aforementioned PUSCH Second It includes a control unit to which FD-OCC is applied. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, an appropriate number of DMRS ports can be used.

Brief Description of the Drawings

[0010] [Figure 1] FIG. 1 shows an example of an existing DMRS port table for DMRS configuration type 1. [Figure 2] FIG. 2 shows an example of an existing DMRS port table for DMRS configuration type 2. [Figure 3] FIGS. 3A to 3D show an example of an FD-OCC of length 4 / 6. [Figure 4] FIG. 4 shows an example of an FD-OCC of length 4. [Figure 5] FIG. 5 shows an example of an existing DMRS port index according to Embodiment #1-1. [Figure 6] FIG. 6 shows an example of a new DMRS port index according to Embodiment #1-1. [Figure 7] FIG. 7 shows an example of an existing DMRS port index according to Embodiment #1-2. [Figure 8] FIG. 8 shows an example of a new DMRS port index according to Embodiment #1-2. [Figure 9] FIG. 9 shows an example of a group subset for Case 1. [Figure 10] FIG. 10 shows an example of a group subset for Case 2. [Figure 11] FIG. 11 shows an example of the value of a new DCI field according to a variation of Embodiment #1-3. [Figure 12] FIG. 12 shows an example of a new DMRS port index according to Embodiment #2-1. [Figure 13] FIG. 13 shows another example of a new DMRS port index according to Embodiment #2-1. [Figure 14] FIG. 14 shows an example of a new DMRS port index according to Embodiment #2-2. [Figure 15]Figure 15 shows another example of a novel DMRS port index according to Embodiment #2-2. [Figure 16] Figure 16 shows an example of a new DCI field value related to a variation of Embodiment #2-3. [Figure 17] Figure 17 shows an example of an existing antenna port instruction table according to Embodiment #3-1. [Figure 18] Figure 18 shows an example of a new antenna port instruction table according to Embodiment #3-1. [Figure 19] Figure 19 shows an example of an existing antenna port instruction table according to Embodiment #3-2. [Figure 20] Figure 20 shows an example of determining the length of the FD-OCC according to Embodiment #4. [Figure 21] Figure 21 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 22] Figure 22 shows an example of the configuration of a base station according to one embodiment. [Figure 23] Figure 23 shows an example of the configuration of a user terminal according to one embodiment. [Figure 24] Figure 24 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 25] Figure 25 shows an example of a vehicle according to one embodiment. [Modes for carrying out the invention]

[0011] (Beam management) NR incorporates beam management techniques. For example, NR considers forming (or utilizing) a beam at at least one of the base station and the UE.

[0012] By applying beamforming (BF), it is expected that the difficulty in ensuring coverage as carrier frequencies increase will be mitigated, and radio wave propagation loss will be reduced.

[0013] BF (Broadcast Field) is a technique that uses, for example, a multi-element antenna to control (also called precoding) the amplitude / phase of the signal transmitted or received from each element, thereby forming a beam (antenna directivity). Such a multi-element antenna used in Multiple Input Multiple Output (MIMO) systems is also known as massive MIMO.

[0014] Beam sweeping may be performed on both the transmitting and receiving sides to select an appropriate pair from multiple candidate patterns of transmit and receive beam pairs. The transmit and receive beam pair may be called a beam pair and may be identified as a beam pair candidate index.

[0015] Furthermore, in beam management, instead of using a single beam, multiple levels of beam control, such as a rough beam and a fine beam, may be employed.

[0016] BF (Bass Flow) can be classified into digital BF and analog BF. Digital BF and analog BF may also be called digital precoding and analog precoding, respectively.

[0017] Digital BF is a method of performing pre-coding signal processing (for digital signals) on the baseband, for example. In this case, parallel processing such as Inverse Fast Fourier Transform (IFFT), Digital to Analog Converter (DAC), and Radio Frequency (RF) is required for each antenna port (or RF chain). On the other hand, a number of beams corresponding to the number of RF chains can be formed at any given time.

[0018] Analog BF is a method that uses a phase shifter on the RF signal, for example. Although analog BF cannot form multiple beams at the same time, it is easy to configure and inexpensive to implement because it only rotates the phase of the RF signal.

[0019] Furthermore, a hybrid BF configuration combining digital and analog BFs is also feasible. While the introduction of large-scale MIMO is being considered for NR, performing the enormous number of beamforming operations solely with digital BFs would result in a costly circuit configuration, so the use of a hybrid BF configuration is also being considered.

[0020] (TCI, spatial relations, QCL) In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) of at least one of a signal and a channel (which may be denoted as signal / channel; hereafter, "A / B" may similarly be read as "at least one of A and B") based on the Transmission Configuration Indication state (TCI state).

[0021] The TCI state may represent the one applied to the downlink signal / channel. The equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

[0022] TCI status refers to information about signal / channel quasi-co-location (QCL), and may also be called spatial reception parameters or spatial relation information (SRI). TCI status may be set for each channel or signal in the UE.

[0023] QCL is an index that indicates the statistical properties of a signal / channel. For example, if two signals / channels have a QCL relationship, it may mean that we can assume that at least one of the following is identical between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0024] The spatial reception parameters may correspond to the UE's received beam (e.g., the received analog beam), and the beam may be identified based on the spatial QCL. In this disclosure, QCL (or at least one element of QCL) may be interpreted as sQCL (spatial QCL).

[0025] QCL may have multiple types (QCL types). For example, there may be four QCL types A and D that differ in the parameters (or parameter sets) that can be assumed to be the same, and these parameters (which may also be called QCL parameters) are shown below: QCL Type A: Doppler shift, Doppler spread, mean delay, and delay spread. QCL Type B: Doppler shift and Doppler spread, • QCL Type C: Doppler shift and mean delay, • QCL Type D: Spatial reception parameters.

[0026] Types A through C may correspond to QCL information related to synchronization processing of at least one of time and frequency, and Type D may correspond to QCL information related to beam control.

[0027] The assumption by the UE that a given control resource set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be called a QCL assumption.

[0028] The UE may determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of a signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0029] The TCI state may, for example, be information regarding the QCL between the target channel (or the reference signal (RS) for that channel) and another signal (for example, another downlink reference signal (DL-RS)). The TCI state may be set (indicated) by upper-layer signaling, physical layer signaling, or a combination thereof.

[0030] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0031] MAC signaling may use, for example, MAC Control Elements (MAC CEs) or MAC Protocol Data Units (PDUs). Broadcast information may also include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), or Other System Information (OSIs).

[0032] Physical layer signaling may include, for example, Downlink Control Information (DCI).

[0033] The channel on which the TCI state is set (specified) may be at least one of the following: a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical Uplink Shared Channel (PUSCH), or a Physical Uplink Control Channel (PUCCH).

[0034] Furthermore, the RS (DL-RS) that has a QCL relationship with the channel may be at least one of the following: a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), or a Sounding Reference Signal (SRS). Alternatively, the DL-RS may be a CSI-RS used for tracking (also called a Tracking Reference Signal (TRS)), or a reference signal (also called a QCL) used for QCL detection.

[0035] An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be called an SS / PBCH block.

[0036] The TCI state information element (RRC's "TCI-state IE") set by upper-layer signaling may include one or more QCL information ("QCL-Info"). The QCL information may include at least one of the following: information about the DL-RS with which it has a QCL relationship (DL-RS relationship information) and information indicating the QCL type (QCL type information). The DL-RS relationship information may include information such as the DL-RS index (e.g., SSB index, Non-Zero-Power (NZP) CSI-RS resource ID (Identifier)), the index of the cell where the RS is located, and the index of the Bandwidth Part (BWP) where the RS is located.

[0037] (Advancements in MIMO technology and beams) Incidentally, while MIMO technology has so far been used in frequency bands lower than 6 GHz, its application to frequency bands higher than 6 GHz is being considered for the future.

[0038] Frequency bands lower than 7.125 GHz may be called Frequency Range (FR) 1, etc. Frequency bands higher than 7.125 GHz / 24.250 GHz may be called FR2, FR2-1, FR2-2, millimeter wave (mmW), FR4, etc.

[0039] The maximum number of MIMO layers is assumed to be limited by the antenna size.

[0040] Even with mmW, by utilizing higher-order MIMO and having multiple UEs cooperate, the degrees of freedom and diversity of MIMO multiplexing can be improved, which in turn is expected to lead to improved throughput.

[0041] Thus, in future wireless communication systems (for example, NR from Rel-17 onwards), even at high frequencies (for example, FR2), it is anticipated that operation using only digital beams without analog beams (which may also be called full digital operation) or operation that predominantly uses digital beams will be employed.

[0042] For example, in fully digital operation, applying orthogonal precoding (or orthogonal beam, digital beam) to multiple UEs simultaneously can be expected to improve frequency utilization efficiency. If digital beam cannot be applied properly, interference between UEs will increase, leading to a deterioration in communication quality (or a decrease in cell capacity). Note that the term "orthogonal" in this disclosure may be interpreted as "quasi-orthogonal."

[0043] If a base station (which may be interpreted as a transmission / reception point (TRP), panel, etc.) can only transmit one beam at a time, the base station switches beams to transmit and receive to the UE. If a base station can transmit multiple beams at a time, it can transmit and receive with multiple UEs simultaneously using different beams.

[0044] Even if base stations become fully digital, as long as Rel.15 UEs exist, Rel.15 UEs should be accommodated (supported).

[0045] (DMRS) The front-loaded DMRS is the first (first symbol or near the first symbol) DMRS for faster demodulation. Additional DMRS can be set by the RRC for fast-moving UEs or high modulation and coding scheme (MCS) / rank. The frequency position of the additional DMRS is the same as that of the front-loaded DMRS.

[0046] For the time domain, either DMRS mapping type A or B is configured. In DMRS mapping type A, DMRS position l_0 is counted by the symbol index within the slot. l_0 is set by a parameter (dmrs-TypeA-Position) in the MIB or Common Serving Cell Configuration (ServingCellConfigCommon). DMRS position 0 (reference point l) means the first symbol in the slot or each frequency hop. In DMRS mapping type B, DMRS position l_0 is counted by the symbol index within the PDSCH / PUSCH. l_0 is always 0. DMRS position 0 (reference point l) means the first symbol in the PDSCH / PUSCH or each frequency hop.

[0047] The location of DMRS is defined by a specification table and depends on the duration of PDSCH / PUSCH. The location of additional DMRS is fixed.

[0048] For each frequency domain, either (PDSCH / PUSCH)DMRS configuration type 1 or 2 is set. DMRS configuration type 1 has a comb structure and is applicable to both CP-OFDM (transport precoding disabled) and DFT-S-OFDM (transport precoding enabled). DMRS configuration type 2 is applicable only to CP-OFDM.

[0049] Single-symbol DMRS or double-symbol DMRS is set.

[0050] Single-symbol DMRS is commonly used (it is a mandatory feature in Rel. 15). In single-symbol DMRS, the number of additional DMRS (symbols) is {0, 1, 2, 3}. Single-symbol DMRS supports both cases where frequency hopping is enabled and disabled. If the maximum number (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is not set, single-symbol DMRS is used.

[0051] Double-symbol DMRS is used for more DMRS ports (especially MU-MIMO). In double-symbol DMRS, the number of additional DMRS (symbols) is {0,1}. Double-symbol DMRS supports cases where frequency hopping is disabled. If the maximum number (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is 2 (len2), whether it is single-symbol DMRS or double-symbol DMRS is determined by DCI or configured grant.

[0052] Based on the above, the following combinations of DMRS configuration patterns are possible. • DMRS configuration type 1, DMRS mapping type A, single symbol DMRS • DMRS configuration type 1, DMRS mapping type A, double symbol DMRS • DMRS configuration type 1, DMRS mapping type B, single symbol DMRS • DMRS configuration type 1, DMRS mapping type B, double symbol DMRS • DMRS configuration type 2, DMRS mapping type A, single symbol DMRS • DMRS configuration type 2, DMRS mapping type A, double symbol DMRS • DMRS configuration type 2, DMRS mapping type B, single symbol DMRS • DMRS configuration type 2, DMRS mapping type B, double symbol DMRS

[0053] Multiple DMRS ports mapped to the same RE (Time and Frequency Resource) are called a DMRS CDM group.

[0054] For DMRS configuration type 1 and single-symbol DMRS, four DMRS ports can be used. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC. Between multiple DMRS CDM groups (two DMRS CDM groups), two DMRS ports are multiplexed by FDM.

[0055] For DMRS configuration type 1 and double-symbol DMRS, eight DMRS ports can be used. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC, and two DMRS ports are multiplexed by a TD OCC. Between multiple DMRS CDM groups (two DMRS CDM groups), two DMRS ports are multiplexed by FDM.

[0056] Six DMRS ports can be used for DMRS configuration type 2 and single-symbol DMRS. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC. Between multiple DMRS CDM groups (three DMRS CDM groups), three DMRS ports are multiplexed by FDM.

[0057] Twelve DMRS ports can be used for DMRS configuration type 2 and double-symbol DMRS. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC, and two DMRS ports are multiplexed by a TD OCC. Between multiple DMRS CDM groups (three DMRS CDM groups), three DMRS ports are multiplexed by FDM.

[0058] Here, we have shown an example of DMRS mapping type B, but DMRS mapping type A is similar.

[0059] In the parameters for PDSCH DMRS (existing table, existing DMRS port table, Figure 1), DMRS ports 1000-1007 can be used for DMRS configuration type 1, and DMRS port 1000-1011 can be used for DMRS configuration type 2.

[0060] In the parameters for PUSCH DMRS (existing table, existing DMRS port table, Figure 2), DMRS ports 0-7 can be used for DMRS configuration type 1, and DMRS ports 0-11 can be used for DMRS configuration type 2.

[0061] (Reference signal port) Multiple port reference signals (e.g., demodulation reference signal (DMRS), CSI-RS) are used for purposes such as orthogonalizing the MIMO layer.

[0062] For example, for Single User MIMO (SU-MIMO), different DMRS ports / CSI-RS ports may be configured for each layer. For Multi User MIMO (MU-MIMO), different DMRS ports / CSI-RS ports may be configured for each layer within a single UE, and for each UE as well.

[0063] Furthermore, using a number of CSI-RS ports greater than the number of layers used in the data is expected to enable more accurate measurement of channel status based on the CSI-RS, thereby contributing to improved throughput.

[0064] In Rel-15 NR, multi-port DMRS can support up to 8 ports for Type 1 DMRS (in other words, DMRS configuration type 1) and up to 12 ports for Type 2 DMRS (in other words, DMRS configuration type 2) by using technologies such as Frequency Division Multiplexing (FDM), Frequency Domain Orthogonal Cover Code (FD-OCC), and Time Domain OCC (TD-OCC).

[0065] In Rel-15 NR, a comb-shaped transmission frequency pattern (comb-shaped resource set) is used as the FDM. Cyclic Shift (CS) is used as the FD-OCC. Furthermore, the TD-OCC can only be applied to double-symbol DMRS.

[0066] The terms OCC in this disclosure may be interpreted interchangeably with orthogonal codes, orthogonalization, cyclic shifts, and the like.

[0067] The DMRS type may also be called the DMRS Configuration type.

[0068] Among DMRSs, those that perform resource mapping in units of two consecutive (adjacent) symbols may be called double-symbol DMRS, and those that perform resource mapping in units of one symbol may be called single-symbol DMRS.

[0069] Both DMRSs may be mapped to one or more symbols per slot, depending on the length of the data channel. A DMRS mapped to the beginning of a data symbol may be called a front-loaded DMRS, while a DMRS mapped additionally to any other position may be called an additional DMRS.

[0070] In the case of DMRS configuration type 1 and single-symbol DMRS, Comb and CS may be used for orthogonalization. For example, up to four antenna ports (APs) may be supported by using two types of Comb and two types of CS (Comb2+2CS).

[0071] In the case of DMRS configuration type 1 and double symbol DMRS, Comb, CS, and TD-OCC may be used for orthogonalization. For example, up to 8 APs may be supported using two types of Comb, two types of CS, and TD-OCC ({1,1} and {1,-1}).

[0072] In the case of DMRS configuration type 2 and single-symbol DMRS, FD-OCC may be used for orthogonalization. For example, up to six APs may be supported by applying orthogonal codes (2-FD-OCC) to two adjacent resource elements (REs) in the frequency direction.

[0073] In the case of DMRS configuration type 2 and double-symbol DMRS, FD-OCC and TD-OCC may be used for orthogonalization. For example, up to 12 APs may be supported by applying orthogonal codes (2-FD-OCC) to two frequency-adjacent REs and TD-OCC ({1,1} and {1,-1}) to two time-adjacent REs.

[0074] Furthermore, in Rel.15 NR, multi-port CSI-RS supports up to 32 ports by using methods such as FDM, Time Division Multiplexing (TDM), Frequency Domain OCC, and Time Domain OCC. The same methods as those used for DMRS described above may also be applied to orthogonalize the CSI-RS.

[0075] Now, the group of DMRS ports orthogonalized by FD-OCC / TD-OCC as described above is also called a Code Division Multiplexing (CDM) group.

[0076] Different CDM groups are orthogonal due to FDM. However, within the same CDM group, channel variations may disrupt the orthogonality of the applied OCC. In this case, receiving signals within the same CDM group at different receiving powers may cause a near-far problem, potentially compromising orthogonality.

[0077] Here, we will explain the TD-OCC / FD-OCC of DMRS in Rel.15 NR. DMRS mapped to a Resource Element (RE) has FD-OCC parameters (which may also be called sequence elements, etc.) in the DMRS sequence. f (k') and the TD-OCC parameters (which may also be called sequence elements, etc.) w t It may also be a sequence obtained by multiplying (l') by .

[0078] Both the TD-OCC and FD-OCC of the DMRS in Rel.15 NR correspond to OCCs with a sequence length (which may also be called OCC length) of 2. Therefore, the possible values ​​for k' and l' are both 0 and 1. By multiplying this FD-OCC by RE units, two DMRS ports can be multiplexed using the same time and frequency resources (2RE). By applying both FD-OCC and TD-OCC, four DMRS ports can be multiplexed using the same time and frequency resources (4RE).

[0079] The two existing DMRS port tables for PDSCH mentioned above (associating antenna port index (number) with parameters) correspond to DMRS configuration types 1 and 2, respectively. Note that 'p' indicates the antenna port number, and 'Δ' indicates the parameter for shifting (offsetting) frequency resources.

[0080] For example, for antenna ports 1000 and 1001, by applying {w f (0), w f (1)} = {+1, +1} and {w f (0), w f (1)} = {+1, -1} respectively, they are orthogonalized using FD - OCC.

[0081] For antenna ports 1000 - 1001 and antenna ports 1002 - 1003 (and in the case of type 2, antenna ports 1004 - 1005 as well), by applying different values of Δ, FDM is applied. Therefore, the antenna ports 1000 - 1003 (or 1000 - 1005) corresponding to single - symbol DMRS are orthogonalized using FD - OCC and FDM.

[0082] For type 1 antenna ports 1000 - 1003 and antenna ports 1004 - 1007, by applying {w t (0), w t (1)} = {+1, +1} and {w t (0), w t (1)} = {+1, -1} respectively, they are orthogonalized using TD - OCC. Therefore, the antenna ports 1000 - 1007 (or 1000 - 1011) corresponding to double - symbol DMRS are orthogonalized using FD - OCC, TD - OCC and FDM.

[0083] For only CP - OFDM, (without increasing the DMRS overhead,) defining a larger number of orthogonal DMRS ports for DL / UL MU - MIMO, making the design common between DL and UL DMRS, up to 24 orthogonal DMRS ports, doubling the maximum number of orthogonal DMRS ports for both single - symbol DMRS and double - symbol DMRS for each applicable DMRS setting type, are being considered.

[0084] In Rel.15, the following cases 1 to 4 can be set. [Case 1] Single Symbol DMRS with DMRS Configuration Type 1 The total number of DMRS ports is 2 (by comb / FDM) × 2 (by FD OCC) = 4 ports. [Case 2] Double symbol DMRS with DMRS configuration type 1 The total number of DMRS ports is 2 (by comb / FDM) × 2 (by FD OCC) × 2 (by TD OCC) = 8 ports. [Case 3] Single Symbol DMRS with DMRS Configuration Type 2 The total number of DMRS ports is 3 (by FDM) × 2 (by FD OCC) = 6 ports. [Case 4] Double symbol DMRS with DMRS configuration type 2 The total number of DMRS ports is 3 (by comb) × 2 (by FD OCC) × 2 (by TD OCC) = 12 ports.

[0085] In Rel.18, it is being considered to double the total number of DMRS ports for cases 1, 2, 3, and 4, to 8, 16, 12, and 24, respectively.

[0086] To increase the number of DMRS ports, the following five options (methods for increasing the number of DMRS ports) are being considered.

[0087] <Option 1> • Introduction of new OCCs with a longer length than existing OCCs (e.g., 4 or 6). Option 1 involves considering factors such as the potential for performance degradation with large delay spreads, potential scheduling limitations, and backward compatibility.

[0088] <Option 2> • Use of TD-OCC on multiple discontinuous DMRS symbols (e.g., TD-OCC on front-loaded DMRS / additional DMRS). Option 2 involves considering potential performance degradation at high UE speeds, scheduling limitations (e.g., how frequency hopping is applied), potential limitations on DMRS configuration (e.g., the number of additional DMRSs is limited), and backward compatibility.

[0089] <Option 3> • Increase the number of CDM groups (for example, increase the number of comb / FDM groups). Option 3 considers factors such as the potential for performance degradation when the delay spread is large, and backward compatibility.

[0090] <Option 4> • Reuse symbols for additional DMRS to increase the number of orthogonal DMRS ports. Option 4 involves considering potential performance degradation at high UE speeds, potential limitations on DMRS settings (e.g., a limit on the number of additional DMRSs), and backward compatibility.

[0091] <Option 5> • Use of TD-OCC on discontinuous multiple DMRS symbols in combination with FD-OCC / FDM (reusing additional DMRS symbols to improve channel estimation performance). Option 5 involves considering potential performance degradation at high UE speeds, potential scheduling limitations (e.g., how frequency hopping is applied), potential limitations on DMRS configuration (e.g., the number of additional DMRSs is limited), and backward compatibility.

[0092] In Option 1, the new FD-OCC for the PDSCH / PUSCH DMRS may conform to at least one of the following options for the new DMRS configuration type 1. <<Option 1-1>> A new FD-OCC of length 6 is applied to 6RE of DMRS within one PRB in one CDM group. <<Option 1-2>> Within a single CDM group, a new FD-OCC of length 4 is applied to 4REs of DMRS, either within a single PRB or spanning multiple consecutive PRBs.

[0093] In Option 1, for PDSCH / PUSCH DMRS, a new FD-OCC of length 4 is applied to the 4REs of the DMRS in one PRB within one CDM group for new DMRS configuration type 2. A new FD-OCC of length 6 may also be supported for new DMRS configuration type 2.

[0094] However, the behavior when using FD-OCC longer than 2 has not yet been sufficiently investigated. If such behavior is not clear, there is a risk that communication throughput / communication quality may deteriorate.

[0095] Therefore, the inventors conceived of a novel method for expanding DMRS ports based on FD-OCC.

[0096] The embodiments relating to this disclosure will be described in detail below with reference to the drawings. Each of the following embodiments (for example, each case) may be used individually or at least two may be applied in combination.

[0097] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0098] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0099] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, information elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0100] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0101] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0102] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0103] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0104] In this disclosure, the terms used include: panel, panel group, beam, beam group, precoder, Uplink (UL) transmit entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relationship, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups, resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pools, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumptions, etc., may be interpreted interchangeably.

[0105] In this disclosure, "to have the ability to..." may be interpreted as "to support / report the ability to..."

[0106] In this disclosure, DMRS port, antenna port, port, port number, and port index may be interpreted interchangeably.

[0107] In this disclosure, RB and PRB may be interpreted as mutually exclusive.

[0108] In this disclosure, OCC#i and the OCC corresponding to OCC index i may be interpreted as mutually interchangeable.

[0109] In each embodiment, the DMRS port table, the association of DMRS ports and parameters may be interchangeable. The parameters may include at least one of the CDM group, Δ, FD OCC, and TD OCC.

[0110] In each embodiment, the antenna port reference table, antenna port table, and the association of values ​​and parameters in the antenna port field may be interchangeable. The parameters may include at least one of the number of DMRS CDM groups without data, the DMRS port (number / index), and the number of preceding DMRS symbols.

[0111] (Wireless communication method) In each embodiment, an existing FD-OCC, an FD-OCC of length 2, w f (k'), may be read as interchangeable. In each embodiment, a new FD-OCC, an FD-OCC longer than 2, w f (k'), can be read interchangeably.

[0112] In each embodiment, existing FD-OCC#0 = [+1 +1] and existing FD-OCC#1 = [+1 -1] may also be set.

[0113] A new FD-OCC may be any of the following OCCs:

[0114] [OCC-a] An OCC of length 4 based on a 4x4 Walsh matrix (sequence). As shown in the example in Figure 3A, for an OCC index i = {0, 1, 2, 3}, four sequences are obtained.

[0115] [OCC-b] OCC of length 4 based on cyclic shift. As shown in the example in Figure 3B, four sequences can be obtained by using the cyclic shift {i·0,i·π / 2,i·π,i·3π / 2} for OCC index i={0,1,2,3}.

[0116] [OCC-c] As shown in the example in Figure 3C, OCC-b is a case where OCC indices 1 and 2 of the OCC are swapped.

[0117] [OCC-d] An OCC of length 6 based on FFT (DFT). As shown in the example in Figure 3D, for an OCC index i = {0, 1, 2, 3, 4, 5}, six sequences are obtained from each row of the DFT matrix.

[0118] [OCC-e] OCC-a and OCC-c are OCCs of length 4 that consist of repeating OCCs of length 2 (existing FD-OCCs). As shown in the example in Figure 4, the first and second halves of OCC#0 and #1 of length 4 (OCCs corresponding to OCC indices 0 and 1) are the same as OCC#0 and #1 of length 2 (OCCs corresponding to OCC indices 0 and 1).

[0119] The following embodiments mainly describe examples of DMRS for PUSCH, but these examples can also be applied to DMRS for PDSCH. When applied to PDSCH, the PDSCH DMRS port index p may be changed to PDSCH DMRS port index p by adding 1000 to the PUSCH DMRS port index p.

[0120] In each embodiment, the existing DMRS port table and the DMRS port table specified in Rel. 15 may be interpreted as interchangeable. In each embodiment, the new DMRS port table and the DMRS port table specified in Rel. 18 and later may be interpreted as interchangeable.

[0121] In the DMRS port table in each embodiment, FD-OCCw f The OCC index of (k') may be represented by the elements of its OCC. The DMRS port table in each embodiment is merely an example and is not limited to this example. The antenna port reference table in each embodiment is merely an example and is not limited to this example.

[0122] <Embodiment #1> This embodiment relates to a case in which a novel FD-OCC of length 4 is supported for the DMRS of PUSCH / PDSCH.

[0123] Embodiment #1-1 In DMRS configuration type 1, some of the multiple series of new FD-OCCs may be associated with existing DMRS port indexes.

[0124] If an FD-OCC of length 2 is used, an existing DMRS port table may be used (Figure 5, or the DMRS port table for DMRS configuration type 1 in Figure 2).

[0125] If the new FD-OCC is OCC-e, the same DMRS port index (0 to 7 for existing DMRS ports and DMRS configuration type 1) may be used for DMRS ports with new FD-OCC#0 and 1, as shown in the example in Figure 6. A different DMRS port index (8 to 15 for new DMRS ports and DMRS configuration type 1) may be used for DMRS ports with new FD-OCC#2 and 3.

[0126] Embodiment #1-2 In DMRS configuration type 2, some of the series of new FD-OCCs may be associated with existing DMRS port indexes.

[0127] When a length 2 FD-OCC is used, an existing DMRS port table may be used (Figure 7, or the DMRS port table for DMRS configuration type 2 in Figure 2).

[0128] If the new FD-OCC is OCC-e, the same DMRS port index (0 to 11 for existing DMRS ports and DMRS configuration type 2) may be used for DMRS ports with new FD-OCC#0 and 1, as shown in the example in Figure 8. For DMRS ports with new FD-OCC#2 and 3, a different DMRS port index (12 to 23 for new DMRS ports and DMRS configuration type 2) may be used.

[0129] 《Embodiment #1-3》 [Assumptions for FD-OCC in the receiver] The receiver may be a base station for PUSCH or a UE for PDSCH. The values ​​of specific parameters for new FD-OCC and existing DMRS ports may be the same as the values ​​of specific parameters for existing FD-OCC and existing DMRS ports. The specific parameters may include at least one of the CDM group, Δ, and TD-OCC. The operation / assumed behavior of a receiver using a new FD-OCC and existing DMRS ports may differ from that of a receiver using existing FD-OCC and existing DMRS ports.

[0130] For an FD-OCC of length 2, the receiver may estimate the channel assuming an FD-OCC of length 2. This operation allows for demodulation using a narrower bandwidth than when assuming an FD-OCC of length 4, in environments with high frequency selectivity, thereby improving performance.

[0131] For an FD-OCC of length 4, the receiver may estimate the channel assuming an FD-OCC of length 4. In this case, the multiplexing capacity of DMRS / MU-MIMO can be increased.

[0132] The new DMRS port table may associate a new parameter related to the assumed length of the FD-OCC with the antenna port index (number) p, in addition to the existing parameters. The existing parameters may include at least one of the following: CDM group, Δ, FD-OCC, and TD-OCC.

[0133] [MU-MIMO between existing DMRS ports and new DMRS ports] Within the new DMRS port table (existing DMRS ports / new DMRS ports), MU-MIMO may be permitted within a single CDM group or across multiple CDM groups.

[0134] MU-MIMO within a single CDM group, using DMRS ports in the existing DMRS port table and DMRS ports in the new DMRS port table, may not be permitted.

[0135] When a base station notifies a UE that it will use a length 4 FD-OCC (meaning a length 4 FD-OCC will be multiplexed, and another UE will use a new DMRS port table), MU-MIMO within a single CDM group may be permitted, using both the DMRS ports in the existing DMRS port table and the DMRS ports in the new DMRS port table. In this case, even if the UE uses an existing DMRS port, it can decode using a length 4 FD-OCC.

[0136] Variations A new concept of CDM group subsets (group subsets) may be introduced under the CDM group. The number of CDM groups and the order of CDM groups within each CDM group subset may follow the existing DMRS port table. A CDM group subset may support at least one of the following cases:

[0137] [Case 1] There may be 8 ports available. There may be 2 CDM groups available. There may be 2 group subsets for each CDM group. There may be 4 DMRS ports for each CDM group. Group subsets #1 and #2 may each correspond to CDM group {0,1}.

[0138] [Case 2] 16 ports may be available. 2 CDM groups may be available. Each CDM group may have 2 group subsets. Each CDM group may have 8 DMRS ports. Group subsets #1 and #2 may each correspond to CDM group {0,1}.

[0139] For each group subset, the order of the CDM groups in the existing DMRS port table may be reused. For the second group subset, the DMRS port index j in the DMRS port table may mean j + P, where P may be the number of DMRS ports in the group subset (the maximum number of DMRS ports in the group subset). For the first group subset, the DMRS port index j in the DMRS port table may mean j.

[0140] Figure 9 shows an example of a group subset for Case 1. In the DMRS port table, DMRS ports {0,1,2,3} correspond to CDM groups {0,0,1,1}, respectively. The mapping for group subset #1 is as shown in its DMRS port table. The actual mapping for group subset #2 is achieved by applying P=4 to the DMRS port table, so that DMRS ports j+P={4,5,6,7} correspond to CDM groups {0,0,1,1}, respectively.

[0141] Figure 10 shows an example of a group subset for Case 2. In the DMRS port table, DMRS ports {0,1,2,3,4,5,6,7} correspond to CDM groups {0,0,1,1,0,0,1,1}, respectively. The mapping for group subset #1 is as shown in its DMRS port table. The actual mapping for group subset #2 is obtained by applying P=8 to the DMRS port table, so that DMRS ports j+P={8,9,10,11,12,13,14,15} correspond to CDM groups {0,0,1,1,0,0,1,1}, respectively.

[0142] A new DCI field may be introduced to indicate the assumption of a DMRS port / FD-OCC. As shown in the example in Figure 11, the value of the new DCI field may be any value from 0 to 2. A value of 0 may indicate an existing DMRS port and an assumed FD-OCC of length 2. A value of 1 may indicate an existing DMRS port and an assumed FD-OCC of length 4. A value of 2 may indicate a new DMRS port (with an assumed FD-OCC of length 4). The values ​​are not limited to this example.

[0143] The DMRS port / FD-OCC assumption may be configured / indicated / notified by a combination of RRC IE and DCI fields. For example, the RRC IE may indicate whether to use an existing DMRS port or a new DMRS port, and the DCI field may indicate whether to assume an FD-OCC of length 2 or an FD-OCC of length 4. The DCI field may be a new DCI field or an existing DCI field.

[0144] According to this embodiment, the UE can use an appropriate DMRS port and can appropriately determine the length of the FD-OCC.

[0145] <Embodiment #2> This embodiment relates to a case in which a novel FD-OCC of any length is supported for a PUSCH / PDSCH DMRS. The length of the novel FD-OCC may be 4, 6, or any other number greater than 2.

[0146] 《Embodiment #2-1》 In DMRS configuration type 1, some of the multiple series of new FD-OCCs do not need to be associated with an existing DMRS port index.

[0147] As shown in the example in Figure 12, the new DMRS port table may only show the DMRS ports corresponding to the new FD-OCC. The DMRS port index corresponding to the new FD-OCC does not need to overlap with the DMRS port index corresponding to the existing FD-OCC.

[0148] As shown in the example in Figure 13, the new DMRS port table may include DMRS ports corresponding to existing FD-OCCs and DMRS ports corresponding to new FD-OCCs. In the new DMRS port table, the DMRS port index corresponding to the new FD-OCC may be added after the DMRS port index corresponding to the existing FD-OCC.

[0149] As shown in the example in Figure 6 above, the new DMRS port table may indicate DMRS ports (where p is 0 or greater) corresponding to the new FD-OCC. At least some of the values ​​of p in the new DMRS port table may overlap with the values ​​of p in the existing DMRS port table. If the use of the new FD-OCC is configured / instructed, the UE will use the new DMRS port table; otherwise, the UE may use the existing DMRS port table.

[0150] Embodiment #2-2 In DMRS configuration type 2, some of the multiple series of new FD-OCCs do not need to be associated with an existing DMRS port index.

[0151] As shown in the example in Figure 14, the new DMRS port table may only show the DMRS ports corresponding to the new FD-OCC. The DMRS port index corresponding to the new FD-OCC does not need to overlap with the DMRS port index corresponding to the existing FD-OCC.

[0152] As shown in the example in Figure 15, the new DMRS port table may include DMRS ports corresponding to existing FD-OCCs and DMRS ports corresponding to new FD-OCCs. In the new DMRS port table, the DMRS port index corresponding to the new FD-OCC may be added after the DMRS port index corresponding to the existing FD-OCC.

[0153] As shown in the example in Figure 8 above, the new DMRS port table may indicate DMRS ports (where p is 0 or greater) corresponding to the new FD-OCC. At least some of the values ​​of p in the new DMRS port table may overlap with the values ​​of p in the existing DMRS port table. If the use of the new FD-OCC is configured / instructed, the UE will use the new DMRS port table; otherwise, the UE may use the existing DMRS port table.

[0154] Embodiment #2-3 [MU-MIMO between existing DMRS ports and new DMRS ports] Within the new DMRS port table (which includes at least one DMRS port corresponding to an existing FD-OCC and a DMRS port corresponding to a new FD-OCC), MU-MIMO may be permitted within a single CDM group or across multiple CDM groups.

[0155] MU-MIMO within a single CDM group, using DMRS ports in the existing DMRS port table and DMRS ports in the new DMRS port table, may not be permitted.

[0156] Variations A subset of CDM groups similar to that of the variation in Embodiment #1 may be introduced. The subset of CDM groups may support at least one of several cases of the variation in Embodiment #1.

[0157] A new DCI field may be introduced to indicate DMRS port / FD-OCC assumptions. As shown in the example in Figure 16, the value of the new DCI field may be any value from 0 to 2. A value of 0 may indicate the existing DMRS port table and the assumption of an FD-OCC of length 2. A value of 1 may indicate the use of the first half of the DMRS port index in the new DMRS port table, or the DMRS port index corresponding to the existing FD-OCC in the new DMRS port table. A value of 2 may indicate the use of the second half of the DMRS port index in the new DMRS port table, or the DMRS port index corresponding to the new FD-OCC in the new DMRS port table. The association between values ​​and indications is not limited to this example.

[0158] DMRS ports may be configured / instructed / notified by a combination of RRC IE and DCI fields. For example, the RRC IE may indicate whether to use an existing DMRS port table or a new DMRS port table, and the DCI field may indicate whether to use the first half of the DMRS port index or the second half of the DMRS port index (i.e., whether to use the DMRS ports corresponding to existing FD-OCCs or the DMRS ports corresponding to new FD-OCCs). The DCI field may be a new DCI field or an existing DCI field.

[0159] According to this embodiment, the UE can use an appropriate DMRS port and can appropriately determine the length of the FD-OCC.

[0160] <Embodiment #3> This embodiment relates to switching between an existing DMRS port table and a new DMRS port table.

[0161] 《Embodiment #3-1》 The existing DMRS port table and the new DMRS port table may be switched based on the RRC IE.

[0162] The RRC IE may also be configured to use either the existing antenna port instruction table or the new antenna port instruction table.

[0163] Figure 17 shows an example of an existing antenna port reference table for PUSCH when the transform precoder is disabled, the DMRS configuration type is 1, the DMRS maximum length is 1, and the rank is 1. The existing antenna port reference table associates the value of the antenna port field with the number of DMRS CDM groups without data and the DMRS port (number / index). Different existing antenna port reference tables may be specified in the specification for at least one of the following: DMRS configuration type, DMRS maximum length, rank, whether the transform precoder is enabled or not, whether π / 2-BPSK modulation is used or not, whether it applies to PUSCH or PDSCH, the number of codewords, and the number of preceding DMRS symbols.

[0164] Figure 18 shows an example of a new antenna port indication table for PUSCH when the transform precoder is disabled, the DMRS configuration type is 1, the DMRS maximum length is 1, and the rank is 1. The new antenna port indication table associates the value of the antenna port field with the number of DMRS CDM groups without data and the DMRS port (number / index). Different new antenna port indication tables may be specified in the specification for at least one of the following: DMRS configuration type, DMRS maximum length, rank, whether the transform precoder is enabled or not, whether π / 2-BPSK modulation is used or not, whether it applies to PUSCH or PDSCH, the number of codewords, and the number of preceding DMRS symbols.

[0165] If the use of an existing antenna port reference table is configured, at least one of the antenna port reference table, antenna port fields, and antenna port field sizes may be the same as the existing specifications.

[0166] When the use of a new antenna port instruction table is configured, the size of the antenna port field may be the size of the antenna port field when the use of an existing antenna port instruction table is configured + 1 bit, so that the antenna port field can indicate up to twice the number of values ​​in the existing antenna port instruction table.

[0167] In the example shown in this diagram, the new antenna port instruction table has values ​​6 through 11 added to the antenna port field compared to the existing antenna port instruction table. In this example, the existing antenna port instruction table is 3 bits, while the new antenna port instruction table is 4 bits.

[0168] The size of the antenna port field when configuring the use of a new antenna port instruction table may be the same as the size of the antenna port field when configuring the use of an antenna port instruction table.

[0169] 《Embodiment #3-2》 The existing DMRS port table and the new DMRS port table may be switched based on MAC CE / RRC IE.

[0170] If the UE has configured dynamic switching between different lengths of FD-OCC (or dynamic switching between an existing DMRS port table and a new DMRS port table), the UE may assume that the size of the antenna port field is the size of the antenna port field for the new FD-OCC. To avoid increasing the number of blind detections, it is preferable that the size of the DCI be fixed for a given RRC configuration.

[0171] Figure 19 shows an example of a first new antenna port instruction table for PUSCH when the transform precoder is disabled, the DMRS configuration type is 1, the DMRS maximum length is 1, the rank is 1, and the use of an FD-OCC of length 2 is indicated. The first new antenna port instruction table associates the value of the antenna port field with at least one of the following: the number of DMRS CDM groups without data, the DMRS port (number / index), and the number of preceding DMRS symbols. Different first new antenna port instruction tables may be specified in the specification for at least one of the following: the DMRS configuration type, the DMRS maximum length, the rank, whether the transform precoder is enabled, whether π / 2-BPSK modulation is used, whether it applies to PUSCH or PDSCH, and the number of codewords.

[0172] The second new antenna port instruction table for PUSCH when the transform precoder is disabled, the DMRS setting type is 1, the DMRS maximum length is 1, the rank is 1, and the use of an FD-OCC longer than 2 is indicated may be the same as that in Figure 18 above. A different second new antenna port instruction table may be specified in the specification for at least one of the following: DMRS setting type, DMRS maximum length, rank, whether the transform precoder is enabled or not, whether π / 2-BPSK modulation is used or not, whether it applies to PUSCH or PDSCH, and the number of codewords.

[0173] In the example shown in this figure, the value of the antenna port field may range from 0 to 15 in both the first and second new antenna port instruction tables. This allows the size of the antenna port field when the use of an FD-OCC of length 2 is instructed to be equal to the size of the antenna port field when the use of an FD-OCC longer than 2 is instructed to be instructed. Reserved values ​​may be added to the antenna port instruction table to accommodate increases in the value of the antenna port field.

[0174] The scheduling DCI for a PDSCH / PUSCH may specify the length of the FD-OCC for the scheduled PDSCH / PUSCH. This FD-OCC length specification may use a new DCI field. This FD-OCC length specification may be a combination of the RRC setting and the new DCI field. This FD-OCC length specification may also use an existing DCI field. This existing DCI field may be an antenna port field or another field.

[0175] To avoid frequent switching of the DMRS port table (increasing UE complexity), several constraints may be imposed. For example, it may be imposed that different lengths of FD-OCC cannot be directed to the same time resource (the UE does not expect different lengths of FD-OCC to be directed to the same time resource). That time resource may be a symbol, subslot, slot, subframe, or frame.

[0176] In a DMRS configuration for PUSCH (e.g., DMRS configuration type 1 with a single symbol), if the indicated number of layers is greater than a certain number of layers (e.g., 4), only the new DMRS port may be used. In this case, the new DCI field (e.g., in variations of Embodiment #1 / #2) may be reserved / used for other purposes.

[0177] If the MAC CE / RRC IE indicates that the FD-OCC length / DMRS port table is to be specified, the UE may be required not to expect the FD-OCC length / DMRS port table to be specified until a certain time after that indication, or the UE may ignore the indication for the FD-OCC length / DMRS port table until a certain time after that indication.

[0178] The new antenna port instruction table may associate parameters indicating the FD-OCC length / DMRS port table with the values ​​in the antenna port field, in addition to the existing parameters. The existing parameters may be at least one of the following: the number of DMRS CDM groups without data, the DMRS port (number / index), and the number of preceding DMRS symbols. The UE may determine the FD-OCC length / DMRS port table based on the values ​​in the antenna port field.

[0179] For an 8Tx UE supporting 8-layer UL transmission, the network may set a range of scheduled ranks via RRC instead of 1 to X layers. For example, for a UE using very good channel quality, the network may set the UE to schedule ranks 5 through 8. In this case, in a certain DMRS configuration (e.g., DMRS configuration type 1 with a single symbol), only the new DMRS port may be used, and the new DCI field (e.g., in the variations of Embodiment #1 / #2) may not be required.

[0180] According to this embodiment, the UE can use an appropriate DMRS port table.

[0181] <Embodiment #4> The UE may receive the PDSCH before the decoding of the scheduled DCI is complete. The UE may buffer the signals received before the decoding of the DCI is complete. After the DCI is decoded, the UE starts channel estimation using the indicated length of the FD-OCC.

[0182] The following restrictions may be imposed. If the scheduling offset of a PDSCH (the time from the last symbol of the PDCCH scheduling that PDSCH to the first symbol of that PDSCH) is less than the threshold (Figure 20), the UE may assume a specific (default) length for the FD-OCC. The specific length may be 2, 4, 6, or any other number. The threshold may be set by the RRC or be the capability reported by the UE. The capability may be timeDurationForQCL.

[0183] According to this embodiment, the UE can appropriately determine the length of the FD-OCC applied to the DMRS of the PDSCH.

[0184] <Supplement> [Notification of information to UE] In the embodiments described above, notification of any information from a Network (NW) (e.g., a Base Station (BS)) to a UE (in other words, reception of any information from a BS at the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0185] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new Logical Channel ID (LCID) not defined in existing standards in the MAC subheader.

[0186] If the above notification is made by a DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) bits assigned to the DCI, or the format of the DCI.

[0187] Furthermore, the notification of any information to the UE in the above-described embodiment may be periodic, semi-persistent, or aperiodic.

[0188] [Notification of information from UE] In the embodiments described above, notification of any information from the UE (to the NW) (in other words, transmission / reporting of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0189] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new LCID, not specified in existing standards, in the MAC subheader.

[0190] If the above notice is issued by the UCI, the notice may be sent using PUCCH or PUSCH.

[0191] Furthermore, the notification of any information from the UE in the above-described embodiments may be periodic, semi-persistent, or aperiodic.

[0192] [Regarding the application of each embodiment] At least one of the embodiments described above may be applied if certain conditions are met. These conditions may be specified in a standard or notified to the UE / BS using upper-layer signaling / physical layer signaling.

[0193] At least one of the embodiments described above may apply only to a UE that has reported or supports a particular UE capability.

[0194] The specific UE capability may represent at least one of the following: • To support specific processing / operation / control / information for at least one of the above embodiments. • To support a greater number of DMRS ports for PDSCH / PUSCH than the existing specifications. - To support a greater number of DMRS ports than existing specifications for PDSCH / PUSCH DMRS using TD-OCC / FD-OCC / FDM. • Supports FD OCCs with a length of 4 / 6 inches. • Support dynamic switching between a DMRS port corresponding to a 2-length FD-OCC and a DMRS port corresponding to a 4-length or 6-length FD-OCC. If the UE does not report support for this, switching based on RRC may be used.

[0195] Furthermore, the above-mentioned specific UE capabilities may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination thereof, such as cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SCS), or capabilities per feature set (FS) or feature set per component-carrier (FSPC).

[0196] Furthermore, the specific UE capabilities described above may be capabilities that apply across all duplexing schemes (common to all duplexing schemes), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0197] Furthermore, at least one of the embodiments described above may be applied when the UE is configured / activated / triggered by upper layer signaling / physical layer signaling to perform certain information (or the actions of the embodiments described above) related to the embodiments described above. For example, such certain information may be information indicating the activation of the functionality of each embodiment, or arbitrary RRC parameters for a particular release (e.g., Rel. 18 / 19).

[0198] If the UE does not support at least one of the above-mentioned specific UE capabilities or does not have the above-mentioned specific information configured, the behavior of, for example, Rel.15 / 16 may be applied.

[0199] (Note A) The following invention is added with respect to one embodiment of this disclosure. [Note 1] A receiving unit that receives information associated with one of the following: a first frequency domain orthogonal cover code (FD-OCC) of length 2, and a second FD-OCC longer than 2. A terminal having a control unit that applies the FD-OCC to the demodulated reference signal (DMRS) of a shared channel based on the aforementioned information. [Note 2] The aforementioned information refers to the terminal specified in Appendix 1, which indicates the DMRS port number. [Note 3] The aforementioned information is the terminal specified in Appendix 1 or Appendix 2, which indicates the length of the FD-OCC. [Note 4] If the information indicates the use of the second FD-OCC, the control unit adds a specific number to the DMRS port number of the terminal described in any of Appendix 1 to Appendix 3.

[0200] (Note B) The following invention is added with respect to one embodiment of this disclosure. [Note 1] A receiving unit that receives information associated with one of the following FD-OCCs: a first frequency domain orthogonal cover code (FD-OCC) of length 2, and a second FD-OCC longer than 2, and receives the antenna port field. A terminal having a control unit that determines the parameter using one of the following associations based on the information: a first association between the value and parameter of the antenna port field, and a second association between the value and parameter. [Note 2] The size of the aforementioned antenna port field depends on the information described above, as per the terminal in Appendix 1. [Note 3] The size of the aforementioned antenna port field is independent of the information above, and is a terminal as described in Appendix 1 or Appendix 2. [Note 4] The aforementioned information is included in the downlink control information for scheduling the shared channel, and pertains to the terminals listed in any of the appendices 1 to 3.

[0201] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0202] Figure 21 shows an example of a schematic configuration of a wireless communication system according to one embodiment. Wireless communication system 1 (which may also be simply called system 1) may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0203] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0204] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0205] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0206] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0207] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0208] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0209] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0210] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0211] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0212] The core network 30 may include network functions (NF) such as User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). Multiple functions may be provided by a single network node. Furthermore, communication with an external network (e.g., the Internet) may occur via the DN.

[0213] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0214] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0215] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0216] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0217] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0218] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0219] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0220] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0221] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0222] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0223] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0224] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0225] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0226] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0227] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0228] (base station) Figure 22 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0229] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0230] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0231] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0232] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0233] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0234] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0235] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0236] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

[0237] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, for example, and generate a bit string to be transmitted.

[0238] The transmission / reception unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0239] The transmission / reception unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 130.

[0240] On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmission / reception antenna 130.

[0241] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0242] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0243] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30 (e.g., network nodes providing NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0244] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0245] The transmitting / receiving unit 120 may transmit information associated with one of the following FD-OCCs: a first frequency domain orthogonal cover code (FD-OCC) of length 2, and a second FD-OCC longer than 2. The control unit 110 may apply the FD-OCC to the demodulation reference signal (DMRS) of the shared channel based on the information.

[0246] The transmitting / receiving unit 120 may transmit information associated with one of the following FD-OCCs: a first frequency domain orthogonal cover code (FD-OCC) of length 2 and a second FD-OCC longer than 2, and transmit the antenna port field. The control unit 110 may determine the parameter based on the information using one of the following associations: a first association between the value and parameter of the antenna port field, and a second association between the value and parameter.

[0247] (User terminal) Figure 23 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0248] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0249] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0250] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0251] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0252] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0253] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0254] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0255] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0256] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data, control information, etc. acquired from the control unit 210, and generate a bit sequence to be transmitted.

[0257] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel encoding (which may include error correction encoding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0258] Note that whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above-mentioned transmission processing to transmit the channel using the DFT-s-OFDM waveform, or if not, it may not perform DFT processing as the above-mentioned transmission processing.

[0259] The transmission / reception unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0260] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 230.

[0261] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0262] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0263] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0264] The transmitting / receiving unit 220 may receive information associated with one of the following FD-OCCs: a first frequency domain orthogonal cover code (FD-OCC) of length 2, and a second FD-OCC longer than 2. Based on this information, the control unit 210 may apply the FD-OCC to the demodulation reference signal (DMRS) of the shared channel.

[0265] The aforementioned information may include DMRS port numbers.

[0266] The aforementioned information may indicate the length of the FD-OCC.

[0267] If the information indicates the use of the second FD-OCC, the control unit may add a specific number to the DMRS port number.

[0268] The transmitting / receiving unit 220 may receive information associated with one of the first frequency domain orthogonal cover codes (FD-OCCs) of length 2 and a second FD-OCC longer than 2, and may receive the antenna port field. Based on the information, the control unit 210 may determine the parameter using one of the following associations: a first association between the value of the antenna port field and the parameter, and a second association between the value and the parameter.

[0269] The size of the antenna port field may depend on the information mentioned above.

[0270] The size of the antenna port field does not need to depend on the aforementioned information.

[0271] The aforementioned information may be included in the downlink control information for scheduling the shared channel.

[0272] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0273] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0274] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 24 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0275] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0276] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0277] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0278] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0279] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0280] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0281] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0282] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0283] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0284] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0285] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0286] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0287] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0288] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0289] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0290] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0291] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0292] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0293] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0294] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0295] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0296] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0297] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0298] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0299] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0300] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0301] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0302] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0303] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0304] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0305] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0306] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0307] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0308] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0309] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0310] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0311] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0312] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0313] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not providing notification of the specified information or by providing notification of other information).

[0314] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0315] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0316] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0317] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0318] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0319] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0320] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0321] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform a control / operation based on said information.

[0322] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0323] A mobile station may also be called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0324] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0325] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0326] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0327] Figure 25 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0328] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0329] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0330] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0331] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0332] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0333] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0334] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0335] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0336] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0337] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0338] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0339] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0340] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0341] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0342] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0343] Each aspect / embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0344] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0345] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0346] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0347] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0348] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0349] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0350] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0351] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0352] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0353] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0354] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0355] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0356] In this disclosure, terms such as "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. Furthermore, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0357] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0358] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. A transmitter that transmits capability information indicating support for applying a second frequency-domain orthogonal cover code (FD-OCC) of length 4 based on a cyclic shift {0, π / 2, π, 3π / 2} to the demodulated reference signal (DMRS) of a physical uplink shared channel (PUCH), A receiving unit that receives a radio resource control (RRC) parameter indicating whether to use a table of first DMRS ports corresponding to a first FD-OCC of length 2 or a table of second DMRS ports corresponding to the second FD-OCC, and downlink control information (DCI) indicating whether to use the first FD-OCC or the second FD-OCC. A terminal having a control unit that applies the second FD-OCC to the DMRS of the PUSCH when the second FD-OCC is instructed by the combination of the RRC parameter and the DCI.

2. The terminal according to claim 1, wherein the control unit applies {+1, +1, +1, +1} or {+1, -1, +1, -1} as the first FD-OCC when the DMRS of the PUSCH is the first DMRS port, and applies {+1, +j, -1, -j} or {+1, -j, -1, +j} as the second FD-OCC when the DMRS of the PUSCH is the second DMRS port.

3. The steps include transmitting capability information indicating support for applying a second frequency-domain orthogonal cover code (FD-OCC) of length 4 based on a cyclic shift {0, π / 2, π, 3π / 2} to the demodulated reference signal (DMRS) of a physical uplink shared channel (PUSCH), Steps include receiving a radio resource control (RRC) parameter indicating whether to use a table of first DMRS ports corresponding to a first FD-OCC of length 2 or a table of second DMRS ports corresponding to the second FD-OCC, and downlink control information (DCI) indicating whether to use the first FD-OCC or the second FD-OCC. A wireless communication method for a terminal, comprising the step of applying the second FD-OCC to the DMRS of the PUSCH when the second FD-OCC is indicated by the combination of the RRC parameters and the DCI.

4. A receiver that receives capability information from a terminal, demonstrating support for applying a second frequency-domain orthogonal cover code (FD-OCC) of length 4 based on a cyclic shift {0, π / 2, π, 3π / 2} to the demodulated reference signal (DMRS) of a physical uplink shared channel (PUSCH), A transmitting unit that transmits a radio resource control (RRC) parameter indicating whether to use a table of first DMRS ports corresponding to a first FD-OCC of length 2 or a table of second DMRS ports corresponding to the second FD-OCC, and downlink control information (DCI) indicating whether to use the first FD-OCC or the second FD-OCC. A base station having a control unit that determines that the second FD-OCC is applied to the DMRS of the PUSCH when the second FD-OCC is instructed by the combination of the RRC parameters and the DCI.

5. A system having terminals and base stations, The aforementioned terminal is A transmitter that transmits capability information indicating support for applying a second frequency-domain orthogonal cover code (FD-OCC) of length 4 based on a cyclic shift {0, π / 2, π, 3π / 2} to the demodulated reference signal (DMRS) of a physical uplink shared channel (PUCH), A receiving unit that receives a radio resource control (RRC) parameter indicating whether to use a table of first DMRS ports corresponding to a first FD-OCC of length 2 or a table of second DMRS ports corresponding to the second FD-OCC, and downlink control information (DCI) indicating whether to use the first FD-OCC or the second FD-OCC. The system includes a control unit that applies the second FD-OCC to the DMRS of the PUSCH when the second FD-OCC is instructed by the combination of the RRC parameters and the DCI, The aforementioned base station is A system having a receiving unit that receives the aforementioned capability information.

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