Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure comprises: a control unit which performs use of more than eight demodulation reference signal (DMRS) ports with respect to DMRS configuration type 1 and / or use of more than twelve DMRS ports with respect to DMRS configuration type 2; and a transmission unit which transmits a DMRS for a physical uplink control channel by using the DMRS ports. According to one aspect of the present disclosure, an appropriate number of DMRS ports can be used.

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 Document 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 the present disclosure includes a receiving unit that receives a setting of a demodulated reference signal (DMRS) using a frequency domain orthogonal cover code (FD-OCC) of length 4 for a physical uplink sharing channel (PUSCH), and a control unit that controls the transmission of the DMRS using associations corresponding to the ports of the DMRS based on the setting, wherein the FD-OCC is generated using cyclic shifts {0, π, π / 2, 3π / 2} for the first sequence element of the FD-OCC, respectively. The association includes multiple entries indicating a code division multiplexing (CDM) group corresponding to a DMRS port index, parameters for shifting frequency resources, and the FD-OCC, wherein the cyclic shift {0,π} is used for the FD-OCCs corresponding to DMRS port indices 0 to 11, and the cyclic shift {π / 2,3π / 2} is used for the FD-OCCs corresponding to DMRS port indices 12 to 23, respectively. ru. [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 the arrangement of DMRS. [Figure 2] FIGS. 2A and 2B show an example of DMRS setting type 1 / 2. [Figure 3] FIGS. 3A and 3B show an example of single-symbol DMRS. [Figure 4] FIGS. 4A and 4B show an example of double-symbol DMRS. [Figure 5] FIG. 5 shows an example of DMRS setting type 1 and single-symbol DMRS. [Figure 6] FIG. 6 shows a first example of DMRS setting type 1 and double-symbol DMRS. [Figure 7] FIG. 7 shows a second example of DMRS setting type 1 and double-symbol DMRS. [Figure 8] FIG. 8 shows a first example of DMRS setting type 2 and single-symbol DMRS. [Figure 9] FIG. 9 shows a second example of DMRS setting type 2 and single-symbol DMRS. [Figure 10] FIG. 10 shows a first example of DMRS setting type 2 and double-symbol DMRS. [Figure 11] FIG. 11 shows a second example of DMRS setting type 2 and double-symbol DMRS. [Figure 12] FIG. 12 shows a third example of DMRS setting type 2 and double-symbol DMRS. [Figure 13] FIG. 13 shows an example of parameters for PDSCH DMRS setting type 1. [Figure 14] FIG. 14 shows an example of parameters for PUSCH DMRS setting type 1. [Figure 15]FIG. 15 shows an example of the mapping of FD OCC for DMRS setting type 2 and single-symbol DMRS of Embodiment #1. [Figure 16] FIG. 16 shows an example of the mapping of FD OCC for DMRS setting type 1 and single-symbol DMRS of Embodiment #1. [Figure 17] FIG. 17 shows an example of Table 1 for DMRS setting type 1. [Figure 18] FIG. 18 shows an example of Table 1 for DMRS setting type 2. [Figure 19] FIG. 19 shows an example of Table 2 for DMRS setting type 1. [Figure 20] FIG. 20 shows another example of Table 2 for DMRS setting type 1. [Figure 21] FIG. 21 shows an example of Table 2 for DMRS setting type 2. [Figure 22] FIG. 22 shows another example of Table 2 for DMRS setting type 2. [Figure 23] FIGS. 23A and 23B show an example of Code A-1. [Figure 24] FIG. 24 shows an example of the cyclic shift for Code A-1. [Figure 25] FIG. 25 shows an example of Code A-2. [Figure 26] FIGS. 26A and 26B show an example of Code A-3. [Figure 27] FIG. 27 shows an example of the mapping of Code A-3. [Figure 28] FIGS. 28A and 28B show an example of Code B-1. [Figure 29] FIG. 29 shows an example of Code B-2. [Figure 30] FIGS. 30A and 30B show an example of Code B-3. [Figure 31] FIG. 31 shows an example of the mapping of Code B-3. [Figure 32] FIGS. 32A and 32B show an example of TD OCC. [Figure 33]Figure 33 shows a first example of the mapping of FD OCC to a single-symbol DMRS for DMRS configuration type 2 in Embodiment #3. [Figure 34] Figure 34 shows a second example of the mapping of FD OCC to a single-symbol DMRS for DMRS configuration type 2 in Embodiment #3. [Figure 35] Figures 35A and 35B show examples of longer FD OCCs. [Figure 36] Figure 36 shows another example of the mapping of FD OCC to single-symbol DMRS for DMRS configuration type 2 in Embodiment #3. [Figure 37] Figure 37 shows an example of an FD OCC with length 8. [Figure 38] Figure 38 shows a first example of mapping an FD OCC of length 8. [Figure 39] Figure 39 shows a second example of mapping an FD OCC of length 8. [Figure 40] Figures 40A and 40B show an example of a TD OCC with a length of 4. [Figure 41] Figure 41 shows an example of mapping a TD OCC of length 4. [Figure 42] Figures 42A and 42B show examples of configured time domain windows. [Figure 43] Figure 43 shows an example of an RB level comb for a single-symbol DMRS. [Figure 44] Figure 44 shows an example of an RB level comb for a double-symbol DMRS. [Figure 45] Figure 45 shows an example of OCC according to Embodiment #5. [Figure 46] Figure 46 shows an example of redundant DMRS for existing UEs and DMRS for new UEs. [Figure 47] Figure 47 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 48] Figure 48 shows an example of the configuration of a base station according to one embodiment. [Figure 49]Figure 49 shows an example of the configuration of a user terminal according to one embodiment. [Figure 50] Figure 50 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 51] Figure 51 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: Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel (PUSCH), or 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 6GHz may also be called sub-6, Frequency Range (FR) 1, etc. Frequency bands higher than 6GHz may also be called above-6, FR2, 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 (Figure 1). 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 DMRS configuration type 1 or 2 is configured. 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. Figure 2A shows an example of DMRS configuration type 1. Figure 2B shows an example of DMRS configuration type 2.

[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. Figure 3A shows an example of single-symbol DMRS (number of additional DMRS = 3) for DMRS configuration type 1. Figure 3B shows an example of single-symbol DMRS (number of additional DMRS = 3) for DMRS configuration type 2.

[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. Figure 4A shows an example of double-symbol DMRS (number of additional DMRS = 1) in DMRS configuration type 1. Figure 4B shows an example of double-symbol DMRS (number of additional DMRS = 1) in DMRS configuration type 2.

[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 2-length FD OCC. Between multiple DMRS CDM groups (two DMRS CDM groups), two DMRS ports are multiplexed by FDM (Figure 5).

[0055] Eight DMRS ports can be used for DMRS configuration type 1 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 (two DMRS CDM groups), two DMRS ports are multiplexed by FDM (Figures 6 and 7).

[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 (Figures 8 and 9).

[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 (Figures 10, 11, and 12).

[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 (Figure 13), 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 (Figure 14), 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 type of DMRS 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 can support 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) is a DMRS series with FD-OCC parameters (which may also be called series elements, etc.) w 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 tables in FIG. 13 above correspond to DMRS configuration types 1 and 2 respectively. Note that p indicates the number of antenna ports, and Δ indicates a parameter for shifting (offsetting) frequency resources.

[0080] For example, for antenna ports 1000 and 1001, {w f (0), w f (1)} = {+1, +1} and {w f (0), w f (1)} = {+1, -1} are applied, and 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), different values of Δ are applied, and thus 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, {w t (0), w t (1)} = {+1, +1} and {w t (0), w t (1)} = {+1, -1} are applied, and 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] In Rel.15, the total number of DMRS ports in a single-symbol DMRS configuration of type 1 (PDSCH DMRS) is 2 (by combo / FDM) × 2 (by FD OCC) = 4 ports. In Rel.15, the total number of DMRS ports in a double-symbol DMRS configuration of type 1 (PDSCH DMRS) is 2 (by combo / FDM) × 2 (by FD OCC) × 2 (by TD OCC) = 8 ports.

[0084] In Rel.15, the total number of DMRS ports in a single-symbol DMRS configuration of type 2 (PDSCH DMRS) is 3 (by FDM) × 2 (by FD OCC) = 6 ports. In Rel.15, the total number of DMRS ports in a double-symbol DMRS configuration of type 2 (PDSCH DMRS) is 3 (by comb) × 2 (by FD OCC) × 2 (by TD OCC) = 12 ports.

[0085] Consideration is being given to specifying a larger number of orthogonal DMRS ports for DL / UL MU-MIMO without increasing DMRS overhead, and doubling the maximum number of DMRS ports for both single-symbol DMRS and double-symbol DMRS.

[0086] There are issues such as how to increase the total number of DMRS ports while keeping DMRS overhead down, and whether to consider different approaches for PDSCH and PUSCH. However, these issues have not yet been thoroughly considered. If appropriate DMRS ports are not available, communication throughput / communication quality may deteriorate.

[0087] Therefore, the inventors conceived a method for setting / reporting CSI to CJT.

[0088] 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.

[0089] 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".

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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).

[0094] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0095] 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.

[0096] In this disclosure, the terms used include: panel, UE 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.

[0097] In this disclosure, time domain resource allocation and time domain resource assignment may be interpreted as mutually exclusive.

[0098] (Wireless communication method) In each embodiment, DMRS, DL DMRS, UL DMRS, PDSCH DMRS, and PUSCH DMRS may be interpreted as interchangeable.

[0099] In each embodiment, orthogonal sequence, OCC, FD OCC, and TD OCC may be interchangeable.

[0100] In each embodiment, joint channel estimation and DMRS bundling may be interchangeable.

[0101] The diagrams in each embodiment mainly show DMRS for PDSCH (DMRS ports 1000-10xx), but each embodiment can also be applied to DMRS for PUSCH (DMRS ports 0-xx).

[0102] <Embodiment #0> This embodiment relates to increasing the number of DMRS ports.

[0103] The DMRS configuration may follow at least one of the following options 0-1 through 0-3. [Options 0-1] Both DMRS configuration types 1 and 2 are extended. In both DMRS configuration types 1 and 2, the total number of DMRS ports may be increased (for example, by doubling). [Options 0-2] Only DMRS configuration type 2 is extended. In DMRS configuration type 2, the total number of DMRS ports may increase (for example, by doubling). For a larger number of DMRS ports, DMRS configuration type 2 is preferable. [Options 0-3] Only DMRS configuration type 1 is extended. Only in DMRS configuration type 1 may the total number of DMRS ports be increased (for example, by doubling). DMRS configuration type 1 has higher performance due to higher DMRS density in the frequency domain. DMRS configuration type 1 is a mandatory feature that does not require capability reporting and is widely used in current networks.

[0104] According to this embodiment, the UE can use a larger number of DMRS ports.

[0105] <Embodiment #1> This embodiment relates to an FD OCC within a single PRB.

[0106] An FD OCC within one PRB in one slot / sub-slot / PDSCH / PUSCH may be specified.

[0107] In the mapping of FD OCC to DMRS configuration type 2 and single-symbol DMRS of Rel.15 (Figure 8 above), the FD OCC has a length of 2 and is mapped to two consecutive subcarriers (2RE).

[0108] FD OCC may be applied across more than two REs (subcarriers) or all REs within a single PRB.

[0109] Figure 15 shows an example of the mapping of FD OCC to DMRS configuration type 2 and single-symbol DMRS in Embodiment #1. In this example, the FD OCC has a length of 4 and is mapped to a discontinuous 4-subcarrier (4RE).

[0110] In the mapping of FD OCC to DMRS configuration type 1 and single-symbol DMRS of Rel.15 (Figure 5 above), the FD OCC has a length of 2 and is mapped to two discontinuous subcarriers (2RE).

[0111] Figure 16 shows an example of the mapping of FD OCC to DMRS configuration type 1 and single-symbol DMRS in Embodiment #1. In this example, the FD OCC has a length of 6 and is mapped to a discontinuous 6-subcarrier (6RE).

[0112] An additional TD OCC (length 2) may be added to the double symbol DMRS.

[0113] 《Embodiment #1-1》 This embodiment relates to a DMRS port table (DMRS parameters, DMRS ports, and parameter associations).

[0114] The UE may select a new table (DMRS port table) for determining DMRS ports based on the higher layer configuration. If the higher layer configures new DMRS ports (more DMRS ports than the existing number), the UE may select a new DMRS port table.

[0115] A new DMRS port table for DMRS configuration type 1 and a new DMRS port table for DMRS configuration type 2 may be specified. If DMRS configuration type 1 and the upper layer parameters for the new DMRS port are set, the UE will use the new DMRS port table for DMRS configuration type 1. If DMRS configuration type 1 is set and the upper layer parameters for the new DMRS port are not set, the UE may use the existing DMRS port table for DMRS configuration type 1 (the DMRS port table specified in Rel. 15). If DMRS configuration type 2 and the upper layer parameters for the new DMRS port are set, the UE will use the new DMRS port table for DMRS configuration type 2. If DMRS configuration type 2 is set and the upper layer parameters for the new DMRS port are not set, the UE may use the existing DMRS port table for DMRS configuration type 2 (the DMRS port table specified in Rel. 15).

[0116] The new DMRS port table may follow either Table 1 or Table 2 below.

[0117] [Table 1] Figure 17 shows an example of Table 1 for DMRS configuration type 1. Figure 18 shows an example of Table 1 for DMRS configuration type 2. In the new DMRS port table, the entries corresponding to the existing DMRS port index (1000-1007 for DMRS configuration type 1, and 1000-1011 for DMRS configuration type 2) (including at least one of the CDM group, Δ, FD OCC, and TD OCC) remain unchanged. Entries for the new DMRS port index are added to the new DMRS port table.

[0118] This new DMRS port table simplifies the specifications and implementations at the UE / base station.

[0119] [Table 2] In the new DMRS port table, entries corresponding to existing DMRS port indices (1000-1007 for DMRS configuration type 1, and 1000-1011 for DMRS configuration type 2) (including at least one of the CDM group, Δ, FD OCC, and TD OCC) are modified. A greater number of consecutive DMRS port indices can be assigned to the same CDM group. In MU-MIMO, multiple DMRS ports within the same CDM group can be assigned to a single UE.

[0120] Figures 19 and 20 show an example of Table 2 for DMRS configuration type 1. In this new DMRS port table, the entries corresponding to DMRS port indices 1000-1003 and 1012-1015 are the same as in the existing DMRS port table, while the entries corresponding to DMRS port indices 1004-1011 are different from those in the existing DMRS port table. In the new DMRS port table in Figure 19, the TD OCC for DMRS port indices 1004-1007 is the same as the TD OCC for DMRS port indices 1000-1003. The order of entries in this new DMRS port table is the same as the order of entries in the existing new DMRS port table: TD OCC, CDM group, FD OCC. In the new DMRS port table in Figure 20, the CDM group for DMRS port indices 1004-1007 is the same as the CDM group for DMRS port indices 1000-1003. Within this new DMRS port table, there are consecutive entries for a single CDM group.

[0121] Figures 21 and 22 show an example of Table 2 for DMRS configuration type 2. In this new DMRS port table, the entries corresponding to DMRS port indices 1000-1003 are the same as in the existing DMRS port table, while the entries corresponding to DMRS port indices 1004-1023 are different from those in the existing DMRS port table. In the new DMRS port table in Figure 21, the TD OCC for DMRS port indices 1004-1011 is different from the TD OCC for DMRS port indices 1000-1003. The order of entries in this new DMRS port table is the same as the order of entries in the existing new DMRS port table: TD OCC, CDM group, FD OCC. In the new DMRS port table in Figure 22, the CDM group for DMRS port indices 1004-1011 is the same as the CDM group for DMRS port indices 1000-1003. In this new DMRS port table, there are consecutive entries for a single CDM group.

[0122] The FD OCC (w_f(k'), where k' is from 0 to 3) in the figure of Embodiment #1-1 is shown in the following Embodiment #1-2.

[0123] Embodiment #1-2 This embodiment relates to FD OCC.

[0124] A new FD OCC (w_f(k'), where k' is between 0 and 3) may be defined.

[0125] For DMRS configuration type 2, a FD OCC of length 4 may be used. This FD OCC may follow any of the following codes A-1 to A-3, or it may be a different series.

[0126] [Code A-1] The FD OCC may also consist of four complex sequences (Figure 23A). As shown in Figure 23B, the FD OCC w_f(k') corresponding to k'={0,1,2,3} may be generated using cyclic shifts α={0,π / 2,π,3π / 2} (Figure 24) on w_f(0). k'={0,1,2,3} may correspond to equally spaced cyclic shifts (e.g., α={0,-π / 2,-π,-3π / 2}, α={0,π,π / 2,3π / 2}) or to unequally spaced cyclic shifts (e.g., α={0,2π / 6,2*2π / 6,3*2π / 6}).

[0127] [Code A-2] The FD OCC may be one of four Walsh series (Figure 25). The FD OCC may be the same as the TD OCC for CSI-RS.

[0128] [Code A-3] FD OCC may be four sequences produced by multiplying two OCCs. For example, FD OCC may be produced by multiplying OCC1 and OCC2 (Figure 26A) (Figure 26B). As in the example in Figure 27, four subcarriers may be divided into two subcarrier groups, with two subcarriers forming one subcarrier group, OCC1 applied to two subcarriers within each subcarrier group, and OCC2 applied to the two subcarrier groups. Both OCC1 and OCC2 are orthogonal sequences, and FD OCC may also be an orthogonal sequence.

[0129] For DMRS configuration type 1, a 6-length FD OCC may be used. This FD OCC may follow any of the following codes B-1 to B-3, or it may be a different series.

[0130] [Code B-1] The FD OCC may also be a sequence of six complex numbers (Figure 28A). As shown in Figure 28B, the FD OCC w_f(k') corresponding to k'={0,1,2,3,4,5} may be generated using the cyclic shifts α={0,π / 2,π,3π / 2,2π,5π / 2} on w_f(0). k'={0,1,2,3} may correspond to equally spaced cyclic shifts (e.g., α={0,-π / 2,-π,-3π / 2,-2π,-5π / 2}, α={0,π,π / 2,3π / 2,0,π}) or to unequally spaced cyclic shifts (e.g., α={0,2π / 6,2*2π / 6,3*2π / 6,4*2π / 6,5*2π / 6}).

[0131] [Code B-2] FD OCC may be generated based on a Walsh sequence of length 4 (Figure 29). w_f(k') corresponding to k'={4,5} may be w_f(k') corresponding to k'={0,1}.

[0132] [Code B-3] FD OCC may be generated by multiplying two OCCs. For example, FD OCC may be generated by multiplying OCC1 and OCC2 (Figure 30A) (Figure 30B). As in the example in Figure 31, six subcarriers may be divided into three subcarrier groups, with two subcarriers forming one subcarrier group, OCC1 applied to two subcarriers within each subcarrier group, and OCC2 applied to the three subcarrier groups. At least one of OCC1 and OCC2 may be an orthogonal sequence. OCC2 may be generated using a cyclic shift for a sequence. The cyclic shift may be α={0,π,2π}, α={0,2π / 3,4π / 3}, etc.

[0133] According to this embodiment, an appropriate FD OCC can be used for the DMRS. This allows for an increase in the number of DMRS ports.

[0134] <Embodiment #2> This embodiment relates to a TD OCC in one slot / sub-slot / PDSCH / PUSCH.

[0135] A TD OCC within one PRB in one slot / sub-slot / PDSCH / PUSCH may be specified.

[0136] A TD OCC may be applied across two symbols or all symbols within a single slot. A TD OCC may be applied across front-loaded DMRS and additional DMRS. This TD OCC may be applied only if additional DMRS are configured. This TD OCC may be applied only if frequency hopping is not configured (i.e., the same frequency is used for the TD OCC symbols).

[0137] Figure 32A shows an example of TD OCC for single-symbol DMRS. In this example, TD OCC is applied to one to four single-symbol DMRS within a single slot.

[0138] Figure 32B shows an example of TD OCC for double-symbol DMRS. In this example, TD OCC is applied to one or two double-symbol DMRS within a single slot.

[0139] The TD OCC w_t(k), k={0,1} may be the same as the FD OCC w_f(k) of length 2 in Embodiment #1.

[0140] According to this embodiment, an appropriate TD OCC can be used for the DMRS. This allows for an increase in the number of DMRS ports.

[0141] <Embodiment #3> This embodiment relates to FD OCC spanning multiple PRBs.

[0142] FD OCCs spanning multiple PRBs within a single slot / sub-slot / PDSCH / PUSCH may be defined.

[0143] FD OCC may be applied across more than one PRB, and these more than one PRB may be consecutive PRBs.

[0144] A length 2 FD OCC may be applied. Figures 33 and 34 show an example of an FD OCC mapping to a single-symbol DMRS of DMRS configuration type 2 in Embodiment #3. In this example, each subcarrier group has four subcarriers, and a length 2 FD OCC is applied to two discontinuous subcarrier groups within two consecutive PRBs.

[0145] An FD OCC of length 2 and an FD OCC of length 8 obtained by multiplying the FD OCC of length 2 may be applied. Each of OCC1 and OCC2 has a length of 2 (Figure 35A). The TD OCC of length 8 may be a sequence obtained by multiplying OCC1 and OCC2 (Figure 35B), or it may be a Walsh sequence of length 8. Figure 36 shows another example of the mapping of FD OCCs to a single-symbol DMRS of DMRS configuration type 2 of Embodiment #3. In this example, the eight subcarriers are divided into two first groups, each having four subcarriers. Each first group is divided into two second groups, each having two subcarriers. OCC1 is applied to the two subcarriers in each second group, and OCC2 is applied to the two first groups.

[0146] [Variations] A longer DMRS sequence and a larger number of DMRS ports may be used.

[0147] An FD OCC of length 8 may be applied (Figure 37). This FD OCC may be based on a Walsh sequence of length 8. In this example, an FD OCC of length 8 is applied to eight subcarriers (Figures 38 and 39).

[0148] When the illustrated example of this embodiment is applied to a double-symbol DMRS, a TD OCC of length 2 may also be applied.

[0149] According to this embodiment, an appropriate FD OCC can be used for the DMRS. This allows for an increase in the number of DMRS ports.

[0150] <Embodiment #4> This embodiment relates to a TD OCC spanning multiple slots / sub-slots / PDSCH / PUSCH.

[0151] A TD OCC may be defined that spans multiple slots / subslots / PDSCH / PUSCH. A TD OCC may be applied across two slots / subslots / PDSCH / PUSCH, whether consecutive or discontinuous.

[0152] For double-symbol DMRS, a TD OCC of length 4 (Figure 40B) obtained by multiplying an OCC1 of length 2 and an OCC2 of length 2 (Figure 40A) may be applied. This TD OCC may also be a Walsh sequence of length 4.

[0153] Figure 41 shows an example of a TD OCC mapping to a single-symbol DMRS of DMRS configuration type 2 in Embodiment #4. A TD OCC of length 2 is applied to two slots.

[0154] When joint channel estimation (coverage extension scheme) is set up for multiple slots / subslots, TD OCC may be applied to those multiple slots. When joint channel estimation (coverage extension scheme) is set up for multiple slots / subslots, the phase of the signals spanning those multiple slots / subslots may be assumed to be continuous / coherent. Setting up joint channel estimation may also mean setting up DMRS bundling (e.g., PUSCH-DMRS-Bundling for PUSCH, PUCCH-DMRS-Bundling for PUCCH).

[0155] A configured time domain window may be set for the UL / DL. For example, this setting may include at least two of the following: the index of the starting slot / subslot, the index of the ending slot / subslot, and the duration of the window. A TD OCC spanning multiple slots / subslots may be applied within that window.

[0156] Figure 42A shows an example of a settime domain window for UL. The UE may assume (or may maintain) power consistency and phase continuity between multiple PUSCH transmissions within the settime domain window. Figure 42B shows an example of a settime domain window for DL. The UE may assume power consistency and phase continuity between multiple PDSCH transmissions within the settime domain window.

[0157] According to this embodiment, an appropriate TD OCC can be used for the DMRS. This allows for an increase in the number of DMRS ports.

[0158] <Comparison> According to Embodiment #1, the FD OCC in one PRB within one slot / sub-slot / PDSCH / PUSCH allows the use of a PDSCH / PUSCH within one PRB within one slot / sub-slot / PDSCH / PUSCH. It is also applicable in the absence of additional DMRS or in the presence of frequency hopping.

[0159] In Embodiment #2, a TD OCC in one PRB within one slot / sub-slot / PDSCH / PUSCH can be expected to provide better performance for low-speed (low-performance) UEs.

[0160] The FD OCC spanning multiple PRBs in Embodiment #3 is applicable even when there is no additional DMRS or when there is frequency hopping.

[0161] In Embodiment #4, the TD OCC spanning multiple slots / sub-slots / PDSCH / PUSCH allows for good performance even for low-speed (low-performance) UEs, even in the absence of additional DMRS or with frequency hopping.

[0162] <Variations> This embodiment relates to RB-level FDM.

[0163] For DMRS configuration types 1 / 2, an RB level FDM configuration may be specified. The RB level FDM configuration may also be an RB level combo.

[0164] In the example in Figure 43, the RB-level comb2 is applied to a single-symbol DMRS with DMRS configuration type 1. The RB-level comb2 maps ports 1000-1007 across even-indexed PRBs (#0, #2, ...) and ports 1008-1015 across odd-indexed PRBs (#1, #3, ...). This results in 8 DMRS ports. Alternatively, the upper layer may configure whether the first DMRS port is mapped to an even-indexed PRB or an odd-indexed PRB.

[0165] In the example in Figure 44, the RB level comb2 is applied to a double-symbol DMRS with DMRS configuration type 2. In this example, ports 1000-1011 are mapped across even-indexed PRBs (#0, #2, ...), and ports 1012-1023 are mapped across odd-indexed PRBs (#1, #3, ...). This results in 24 DMRS ports. Alternatively, the upper layer may configure whether the first DMRS port is mapped to an even-indexed PRB or an odd-indexed PRB.

[0166] This variation allows for an increase in the number of DMRS ports.

[0167] <Embodiment #5> This embodiment relates to the multiplexing of a DMRS for new UEs and a DMRS for existing UEs.

[0168] An existing UE may be a Rel.15 / 16 / 17 UE. A new UE may use a larger number of DMRS ports than the existing UE, or it may use the OCC / DMRS of each of the aforementioned embodiments / variations, or it may be a Rel.18 or later UE.

[0169] It is preferable to enable MU-MIMO that spans both existing and new UEs. It is important that the new OCCs in each of the above embodiments and the existing OCCs in Rel.15 are orthogonal.

[0170] New OCCs (OCCs for the aforementioned codes A-1 / A-2 / A-3 / B-1 / B-2 / B-3) can be orthogonal to existing OCCs. New OCCs can also be orthogonal to existing OCCs if an existing OCC is part of a new OCC. New OCCs may be longer than existing OCCs.

[0171] A portion of the new OCC for code B-3 (Figure 30B) is the same as the existing OCC of length 2 (Figure 30A). In this example, in the new OCC corresponding to index 0 of OCC2, the portions w_f(0) and w_f(1), w_f(2) and w_f(3), and w_f(4) and w_f(5) are the same as the existing OCC. A portion of a new OCC associated with a particular index may be the same as the existing OCC associated with that particular index.

[0172] The mapping order of new OCCs may be changed to maintain the same OCC for the same DMRS port. As shown in the example in Figure 45, new OCCs may be indexed with priority given to new OCCs (code B-3) in which a portion of the new OCC is the same as an existing OCC.

[0173] To maintain orthogonality, the receiver (base station / UE) should know the length of the OCC. For example, if an OCC of length 2 is applied, the receiver can decode it using two points (2RE, points / RE that are multiples of 2) of the received signal. If an OCC of length 4 is multiplexed, the receiver needs to use four points (4RE, points / RE that are multiples of 4) of the received signal to decode it.

[0174] In the example in Figure 46, a DMRS with an existing FD OCC of length 2 is transmitted at four REs, and a DMRS with a new FD OCC of length 4 is transmitted at the same four REs, thereby multiplexing the DMRS for the existing UE and the DMRS for the new UE. If the length of all multiplexed OCCs is 2, the receiver uses the received signals from two REs to decode the OCC. In this example, to maintain orthogonality, the receiver uses the received signals from four REs to decode the OCC.

[0175] For the DMRS of the PDSCH, the UE may use received signals on M REs for decoding the OCC, where M is the length of the new OCC. Information regarding the length of the OCC may be communicated by upper-layer signaling. An existing UE may always assume all signals / REs within one PRB. In this case, the existing UE can decode the new OCC of Embodiment #1. An existing UE does not always assume all signals / REs within one PRB. In this case, the UE cannot decode the new OCC.

[0176] How OCC is decoded for PUSCH's DMRS may depend on the base station's implementation.

[0177] According to this embodiment, the DMRS for existing UEs and the DMRS for new UEs can be duplicated. This improves the efficiency of resource utilization.

[0178] <Other Embodiments> 《UE Ability Information / Higher Layer Parameters》 Higher layer parameters (RRC IE) / UE capabilities may be defined corresponding to the functions (features) in each of the above embodiments. The higher layer parameters may indicate whether or not to enable the function. The UE capabilities may indicate whether or not the UE supports the function.

[0179] A UE that has the corresponding higher-level parameter set may perform that function. It may also be stipulated that "a UE that does not have the corresponding higher-level parameter set may not perform that function (for example, according to Rel. 15 / 16)."

[0180] A UE that reports / submits UE capability indicating support for that function may perform that function. It may be stipulated that "a UE that has not reported UE capability indicating support for that function shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0181] If the UE reports / sends a UE capability indicating support for that function, and the corresponding higher-layer parameters are set, the UE may perform that function. It may also be stipulated that "if the UE does not report / send a UE capability indicating support for that function, or if the corresponding higher-layer parameters are not set, the UE shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0182] Which of the above multiple embodiments / options / choices / features is used may be set by higher-layer parameters, reported by the UE as UE capability, specified in the specification, or determined by the reported UE capability and the setting of the higher-layer parameters.

[0183] UE capability may indicate whether the UE supports at least one of the following features: • More DMRS ports than the existing specifications (Rel.15 / 16). FD OCC, TD OCC. FD OCC within one PRB in one slot / sub-slot / PDSCH / PUSCH. TD OCC within one PRB in one slot / sub-slot / PDSCH / PUSCH. FD OCC spanning multiple PRBs. TD OCC spanning multiple slots / sub-slots / PDSCH / PUSCH. • A greater number of DMRS ports for DMRS configuration type 1 or 2 or both. • A greater number of DMRS ports for DMRS mapping type A, B, or both. • A single-symbol DMRS, or a greater number of DMRS ports compared to a single-symbol DMRS and a double-symbol DMRS.

[0184] UE capability may represent at least one of the following values: • Number of DMRS ports.

[0185] Based on the above UE capabilities / higher layer parameters, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0186] (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.

[0187] Figure 47 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0188] 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.

[0189] 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.

[0190] 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))).

[0191] 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.

[0192] 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).

[0193] 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.

[0194] 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).

[0195] 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.

[0196] 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.

[0197] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0198] 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).

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0209] 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.

[0210] 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.

[0211] 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).

[0212] (base station) Figure 48 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.

[0213] 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.

[0214] The control unit 110 controls the entire base station 10. The control unit 110 can consist of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] The transmitting / receiving unit 120 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.

[0221] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0222] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0223] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0224] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0225] 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.

[0226] 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.

[0227] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0228] 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.

[0229] The control unit 110 may use at least one of the following: more than eight DMRS ports for demodulation reference signal (DMRS) setting type 1, or more than twelve DMRS ports for DMRS setting type 2. The transmitting / receiving unit 120 may use the DMRS ports to transmit DMRS and physical downlink control channels.

[0230] The control unit 110 may use more than eight DMRS ports for demodulation reference signal (DMRS) setting type 1, and more than twelve DMRS ports for DMRS setting type 2, at least one of these. The transceiver unit 120 may use the DMRS ports to receive DMRS and physical uplink control channels.

[0231] The control unit 110 may use a first orthogonal cover code for either eight or fewer DMRS ports for demodulation reference signal (DMRS) setting type 1, or twelve or fewer DMRS ports for DMRS setting type 2, and may use a second orthogonal cover code for either eight or more DMRS ports for DMRS setting type 1, or twelve or more DMRS ports for DMRS setting type 2. The transmitting / receiving unit 120 may transmit or receive DMRS using the DMRS ports.

[0232] (User terminal) Figure 49 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.

[0233] 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.

[0234] 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.

[0235] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission, reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0236] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0237] The transceiver unit 220 may be configured as an integrated transceiver unit or may be composed of a transmitter unit and a receiver unit. The transmitter unit may be composed of the transmission processing unit 2211 and the RF unit 222. The receiver unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0238] The transceiver antenna 230 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0239] The transceiver unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transceiver unit 220 may transmit the above-described uplink channel, uplink reference signal, etc.

[0240] The transceiver unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0241] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0242] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0243] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0244] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0245] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] The control unit 210 may use at least one of the following: more than eight DMRS ports for demodulation reference signal (DMRS) setting type 1, or more than twelve DMRS ports for DMRS setting type 2. The transceiver unit 220 may receive DMRS and physical downlink control channels using the DMRS ports.

[0250] The control unit 210 may apply frequency domain orthogonal cover codes to the DMRS in more than two subcarriers within one or more resource blocks.

[0251] The control unit 210 may apply a time-domain orthogonal cover code to the DMRS in more than two symbols within one or more time resources for any of the time resources of a slot, a sub-slot, or the physical downlink control channel.

[0252] The DMRS may have a comb structure in units of resource blocks.

[0253] The control unit 210 may perform at least one of using more than 8 DMRS ports for the demodulation reference signal (DMRS) setting type 1 and using more than 12 DMRS ports for the DMRS setting type 2. The transceiver unit 220 may transmit the DMRS and the physical uplink control channel using the DMRS ports.

[0254] The control unit 210 may apply a frequency-domain orthogonal cover code to the DMRS in more than 2 subcarriers within one or more resource blocks.

[0255] The control unit 210 may apply a time-domain orthogonal cover code to the DMRS in more than 2 symbols within one or more time resources for any of the time resources of the slot, sub-slot, and the physical downlink control channel.

[0256] The DMRS may have a comb structure in units of resource blocks.

[0257] The control unit 210 uses a first orthogonal cover code for either 8 or fewer DMRS ports for the demodulation reference signal (DMRS) setting type 1 and 12 or fewer DMRS ports for the DMRS setting type 2, and may use a second orthogonal cover code for either more than 8 DMRS ports for the DMRS setting type 1 or more than 12 DMRS ports for the DMRS setting type 2. The transceiver unit 220 may transmit or receive the DMRS using the DMRS ports.

[0258] The second orthogonal cover code may be longer than the first orthogonal cover code.

[0259] The control unit 210 may determine that a portion of the second orthogonal cover code associated with a particular index may be the same as the first orthogonal cover code associated with the particular index.

[0260] The control unit 210 may control the reception of information regarding the length of the second orthogonal cover code.

[0261] (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.

[0262] 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.

[0263] 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 50 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] 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.

[0271] 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).

[0272] 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).

[0273] 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.

[0274] 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.

[0275] (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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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.

[0289] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0290] 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.

[0291] 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.

[0292] 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.

[0293] 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".

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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).

[0301] 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).

[0302] 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 notifying the specified information or by notifying other information).

[0303] 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).

[0304] 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.

[0305] 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.

[0306] 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).

[0307] 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.

[0308] 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.

[0309] 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.

[0310] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0311] 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.

[0312] 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.

[0313] 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.

[0314] 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.

[0315] Figure 51 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.

[0316] 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.

[0317] 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).

[0318] 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.

[0319] 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.

[0320] 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.).

[0321] 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.

[0322] 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.

[0323] 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).

[0324] 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.

[0325] 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).

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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).

[0332] 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."

[0333] 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.

[0334] 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.

[0335] 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).

[0336] 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.

[0337] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0338] 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.

[0339] 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.”

[0340] 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).

[0341] 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."

[0342] 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.

[0343] 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.

[0344] 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 receiving unit that receives the setting of a demodulation reference signal (DMRS) using a 4-length frequency-domain orthogonal cover code (FD-OCC) for a physical uplink sharing channel (PUCH), The system includes a control unit that controls the transmission of the DMRS using an association corresponding to the DMRS port based on the above setting, The FD-OCC is generated by applying cyclic shifts {0, π, π / 2, 3π / 2} to the first sequence element of the FD-OCC, The association includes multiple entries indicating a code division multiplexing (CDM) group corresponding to a DMRS port index, parameters for shifting frequency resources, and the FD-OCC. A terminal in which the cyclic shift {0, π} is used for the FD-OCCs corresponding to port indices 0 to 11 of the DMRS, and the cyclic shift {π / 2, 3π / 2} is used for the FD-OCCs corresponding to port indices 12 to 23 of the DMRS.

2. The terminal according to claim 1, further comprising a transmitting unit that transmits capability information indicating support for the DMRS for both a first DMRS mapping type and a second DMRS mapping type.

3. The steps include receiving the configuration of a demodulation reference signal (DMRS) using a 4-length frequency-domain orthogonal cover code (FD-OCC) for a physical uplink sharing channel (PUCH), The step of controlling the transmission of the DMRS using an association corresponding to the DMRS port based on the above setting, The FD-OCC is generated by applying cyclic shifts {0, π, π / 2, 3π / 2} to the first sequence element of the FD-OCC, The association includes multiple entries indicating a code division multiplexing (CDM) group corresponding to a DMRS port index, parameters for shifting frequency resources, and the FD-OCC. A wireless communication method for a terminal, wherein the cyclic shift {0, π} is used for the FD-OCCs corresponding to port indices 0 to 11 of the DMRS, and the cyclic shift {π / 2, 3π / 2} is used for the FD-OCCs corresponding to port indices 12 to 23 of the DMRS.

4. A transmitting unit that transmits to the terminal the settings for a demodulation reference signal (DMRS) using a 4-length frequency-domain orthogonal cover code (FD-OCC) for a physical uplink sharing channel (PUCH), The system includes a control unit that controls the reception of the DMRS using an association corresponding to the DMRS port based on the above setting, The FD-OCC is generated by applying cyclic shifts {0, π, π / 2, 3π / 2} to the first sequence element of the FD-OCC, The association includes multiple entries indicating a code division multiplexing (CDM) group corresponding to a DMRS port index, parameters for shifting frequency resources, and the FD-OCC. A base station in which the cyclic shift {0, π} is used for the FD-OCCs corresponding to port indices 0 to 11 of the DMRS, and the cyclic shift {π / 2, 3π / 2} is used for the FD-OCCs corresponding to port indices 12 to 23 of the DMRS.

5. A system having terminals and base stations, The terminal includes a receiving unit that receives the setting of a demodulation reference signal (DMRS) using a frequency-domain orthogonal cover code (FD-OCC) of length 4 for a physical uplink sharing channel (PUSCH), The system includes a control unit that controls the transmission of the DMRS using an association corresponding to the DMRS port based on the above setting, The base station includes a transmitting unit that transmits the settings to the terminal, The system includes a control unit that controls the reception of the DMRS based on the above settings, The FD-OCC is generated by applying cyclic shifts {0, π, π / 2, 3π / 2} to the first sequence element of the FD-OCC, The association includes multiple entries indicating a code division multiplexing (CDM) group corresponding to a DMRS port index, parameters for shifting frequency resources, and the FD-OCC. A system in which the cyclic shift {0, π} is used for the FD-OCCs corresponding to port indices 0 to 11 of the DMRS, and the cyclic shift {π / 2, 3π / 2} is used for the FD-OCCs corresponding to port indices 12 to 23 of the DMRS.

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