Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one embodiment of the present disclosure comprises: a reception unit that receives a demodulation reference signal (DMRS) configuration; and a control unit that, on the basis of said configuration and at least one association between a plurality of code division multiplexing (CDM) groups and a plurality of DMRS ports, controls the transmission and reception of the DMRS. The number of the plurality of CDM groups for a DMRS configuration type 1 is greater than 2, and the number of the plurality of CDM groups for a DMRS configuration type 2 is greater than 3. With this embodiment of the present disclosure, it is possible to use a suitable number of DMRS ports.

Description

Technical Field

[0001] This disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. 、 base station and system and is concerned with.

Background Art

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

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In future wireless communication systems (e.g., NR), beam management techniques are introduced. For example, in NR, forming (or using) beams is considered in at least one of a base station and a user terminal (User Equipment (UE)).

[0006] On the other hand, for orthogonalization of layers, etc., reference signals of multiple ports (e.g., Demodulation Reference Signal (DMRS)) are used. In future wireless communication systems, it is required to increase the number of DMRS ports compared to existing specifications. However, how to increase the DMRS ports has not been studied yet. If an appropriate number of DMRS ports cannot be used, there is a risk that communication throughput / communication quality will deteriorate.

[0007] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method 、 a base station and system for using an appropriate number of DMRS ports.

Means for Solving the Problems

[0008] A terminal according to an aspect of the present disclosure includes a higher layer signal The restoration ring that sets a first D DMRS setting type or a second Na MRS setting type, and a receiving unit that receives downlink control information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH) including an antenna port indication, and a control unit that controls transmission of DMRS for the PUSCH based on an association between the number of code division multiplexing (CDM) groups and one or more DMRS ports corresponding to the value of the antenna port indication. The first DWhen the MRS setting type is set, two CDM groups are available, and the second D When the MRS configuration type is set, three CDM groups are available, and each of the CDM groups has four existing of A first group subset and four extensions corresponding to DMRS ports. done Includes a second group subset corresponding to DMRS ports. [Effects of the Invention]

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

[0010] [Figure 1] Figure 1 shows an example of parameters for PDSCH DMRS configuration type 1. [Figure 2] Figure 2 shows an example of parameters for PUSCH DMRS configuration type 1. [Figure 3] Figure 3 shows an example of a new DMRS port table for increasing the number of DMRS ports. [Figure 4] Figure 4 shows another example of a new DMRS port table for increasing the number of DMRS ports. [Figure 5] Figure 5 shows an example of a new DMRS port table for DMRS configuration type 1 related to option 1 of option 1. [Figure 6] Figure 6 shows an example of a new DMRS port table for DMRS configuration type 2 related to option 1 of option 1. [Figure 7] Figure 7 shows an example of a new DMRS port table for DMRS configuration type 1 related to option 2 of option 1. [Figure 8] Figure 8 shows an example of a new DMRS port table for DMRS configuration type 2 related to option 2 of option 1. [Figure 9] Figure 9 shows an example of a new DMRS port table related to Option 2, Case 1. [Figure 10] Figure 10 shows an example of a new DMRS port table related to Option 2, Case 3. [Figure 11] Figure 11 shows an example of a pseudo-random sequence generator for generating DMRS sequences. [Figure 12] Figure 12 shows an example of a CDM group list for Case 1. [Figure 13] Figure 13 shows an example of a CDM group list for Case 2. [Figure 14] Figure 14 shows an example of a CDM group list for Case 3. [Figure 15] Figure 15 shows an example of a CDM group list for Case 4. [Figure 16] Figure 16 shows an example of a DMRS configuration. [Figure 17] Figure 17 shows an example of an existing antenna port table for DMRS configuration type 1, DMRS maximum length = 1. [Figure 18] Figure 18 shows a first example of an existing antenna port table for DMRS configuration type 1, DMRS maximum length = 2. [Figure 19] Figure 19 shows a second example of an existing antenna port table for DMRS configuration type 1, DMRS maximum length = 2. [Figure 20] Figure 20 shows a first example of an existing antenna port table for DMRS configuration type 2, DMRS maximum length = 1. [Figure 21] Figure 21 shows a second example of an existing antenna port table for DMRS configuration type 2, DMRS maximum length = 1. [Figure 22] Figure 22 shows a first example of an existing antenna port table for DMRS configuration type 2, DMRS maximum length = 2. [Figure 23] Figure 23 shows a second example of an existing antenna port table for DMRS configuration type 2, DMRS maximum length = 2. [Figure 24]Figure 24 shows a third example of an existing antenna port table for DMRS configuration type 2, DMRS maximum length = 2. [Figure 25] Figure 25 shows an example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, and rank = 1. [Figure 26] Figure 26 shows an example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, and rank = 2. [Figure 27] Figure 27 shows an example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, rank = 3, 4. [Figure 28] Figure 28 shows another example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, extended port count, and rank = 1. [Figure 29] Figure 29 shows another example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, extended port count, and rank = 2. [Figure 30] Figure 30 shows another example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, rank = 3, and rank 4. [Figure 31] Figure 31 shows an example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 2, number of extended ports, and rank = 1. [Figure 32] Figure 32 shows an example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 2, number of extended ports, and rank = 2. [Figure 33] Figure 33 shows an example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 2, number of extended ports, rank = 3, 4. [Figure 34] Figure 34 shows an example of expanding the new antenna port table. [Figure 35] Figure 35 shows an example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 1, number of extended ports, and rank = 1. [Figure 36]Figure 36 shows an example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 1, number of extended ports, and rank = 2. [Figure 37] Figure 37 shows an example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 1, number of extended ports, rank = 3, 4. [Figure 38] Figure 38 shows an example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 1. [Figure 39] Figure 39 shows an example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 2. [Figure 40] Figure 40 shows an example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 3. [Figure 41] Figure 41 shows an example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 4. [Figure 42] Figure 42 shows an example of an existing antenna port table for PDSCH, DMRS setting type = 1, and DMRS maximum length = 1. [Figure 43] Figure 43 shows an example of an existing antenna port table for PDSCH, DMRS setting type = 1, and DMRS maximum length = 2. [Figure 44] Figure 44 shows an example of an existing antenna port table for PDSCH, DMRS setting type = 2, and DMRS maximum length = 1. [Figure 45] Figure 45 shows an example of an existing antenna port table for PDSCH, DMRS setting type = 2, and DMRS maximum length = 2. [Figure 46] Figure 46 shows an example of a new antenna port table for the case of DMRS setting type 1, DMRS maximum length = 1, and number of extended ports according to Embodiment #9. [Figure 47]Figure 47 shows an example of the first part of a new antenna port table for the case of DMRS setting type 1, DMRS maximum length = 2, and number of extended ports according to Embodiment #9. [Figure 48] Figure 48 shows an example of the second part of a new antenna port table for the case of DMRS setting type 1, DMRS maximum length = 2, and number of extended ports according to Embodiment #9. [Figure 49] Figure 49 shows an example of the third part of a new antenna port table for the case of DMRS setting type 1, DMRS maximum length = 2, and number of extended ports according to Embodiment #9. [Figure 50] Figure 50 shows an example of a group subset for Case 1. [Figure 51] Figure 51 shows an example of a group subset for Case 2. [Figure 52] Figure 52 shows an example of a group subset for Case 3. [Figure 53] Figure 53 shows an example of a group subset for Case 4. [Figure 54] Figure 54 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 55] Figure 55 shows an example of the configuration of a base station according to one embodiment. [Figure 56] Figure 56 shows an example of the configuration of a user terminal according to one embodiment. [Figure 57] Figure 57 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 58] Figure 58 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. The frequency position of the additional DMRS is the same as that of the front-loaded DMRS.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0067] The 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 an OCC with a sequence length (which may also be called the OCC length) = 2. Therefore, all possible values of k' and l' are 0 and 1. By multiplying this FD-OCC by the RE unit, DMRS for two ports can be multiplexed using the same time and frequency resources (2RE). When both this FD-OCC and TD-OCC are applied, DMRS for four ports can be multiplexed using the same time and frequency resources (4RE).

[0079] The two existing DMRS port tables for the PDSCH mentioned above correspond to DMRS configuration types 1 and 2 respectively. Here, p indicates the number of the antenna port, and Δ indicates the parameter for shifting (offsetting) the frequency resource.

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

[0081] For antenna ports 1000 - 1001 and antenna ports 1002 - 1003 (and in the case of type 2, also antenna ports 1004 - 1005), FDM is applied by applying different values of Δ. Therefore, the antenna ports 1000 - 1003 (or 1000 - 1005) corresponding to the single-symbol DMRS are orthogonalized using the 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} is applied, resulting in orthogonalization using TD-OCC. Therefore, antenna ports 1000-1007 (or 1000-1011) corresponding to double symbol DMRS are orthogonalized using FD-OCC, TD-OCC, and FDM.

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

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

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

[0086] The DMRS CDM group and its associated DMRS port instruction table have not yet been thoroughly examined. Failure to clarify these may result in a degradation of communication throughput / quality.

[0087] Therefore, the inventors conceived a method for configuring / determining DMRS ports / DMRS CDM groups.

[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, DMRS port, antenna port, and port may be interpreted as interchangeable. In each embodiment, port index and port number may be interpreted as interchangeable. In each embodiment, DMRS CDM group and CDM group may be interpreted as interchangeable. In each embodiment, antenna port indicator and antenna port field may be interpreted as interchangeable.

[0101] In each embodiment, the CDM group list, list, and CDM group subset may be interpreted as interchangeable.

[0102] In each embodiment, the DMRS for PDSCH (DMRS ports 1000-10xx) and the DMRS for PUSCH (DMRS ports 0-xx) may be interchangeable.

[0103] -Analysis #1 Figure 3 shows an example of a new DMRS port table for increasing the number of DMRS ports for PDSCH DMRS configuration type 1. Figure 4 shows another example of a new DMRS port table for increasing the number of DMRS ports for PDSCH DMRS configuration type 1. Such a new DMRS port table and a new FD OCC W f (k') / TD OCC W t (l') / DMRS configuration and by using this, the number of DMRS ports can be increased from the existing number of DMRS ports. f (k') may have the same length as the existing FD OCC, or it may be longer than the existing FD OCC. f (k') may be a series containing values ​​of 0 and 1, or a series containing complex values. In this new DMRS port table, the CDM group for the new DMRS port is an existing CDM group.

[0104] The UE may receive DMRS configurations and control the sending and receiving of DMRS based on one or more associations and configurations between multiple CDM groups and multiple DMRS ports. The number of multiple CDM groups for DMRS configuration type 1 may be greater than 2, and the number of multiple CDM groups for DMRS configuration type 2 may be greater than 3.

[0105] <Embodiment #1> This embodiment relates to the mapping of CDM groups and DMRS port indices (e.g., DMRS port index order, CDM group order, CDM grouping order / method).

[0106] In Cases 1 through 4 of Rel.15, the mapping between CDM groups and DMRS port indices is as follows:

[0107] [Case 1] Four ports and two CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1} and CDM group #1 may correspond to DMRS port index {2,3}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001} and CDM group #1 may correspond to DMRS port index {1002,1003}.

[0108] [Case 2] 8 ports and 2 CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1,4,5} and CDM group #1 may correspond to DMRS port index {2,3,6,7}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001,1004,1005} and CDM group #1 may correspond to DMRS port index {1002,1003,1006,1007}.

[0109] [Case 3] Six ports and three CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1}, CDM group #1 may correspond to DMRS port index {2,3}, and CDM group #2 may correspond to DMRS port index {4,5}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001}, CDM group #1 may correspond to DMRS port index {1002,1003}, and CDM group #2 may correspond to DMRS port index {1004,1005}.

[0110] [Case 4] 12 ports and 3 CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port indices {0,1,6,7}, CDM group #1 to DMRS port indices {2,3,8,9}, and CDM group #2 to DMRS port indices {4,5,10,11}. For PDSCH, CDM group #0 may correspond to DMRS port indices {1000,1001,1006,1007}, CDM group #1 to DMRS port indices {1002,1003,1008,1009}, and CDM group #2 to DMRS port indices {1004,1005,1010,1011}.

[0111] In this embodiment, the mapping of CDM groups and DMRS port indices may follow either of the following options 1 and 2.

[0112] 《Option 1》 The UE may support new CDM groups for new (more) DMRS ports. In this case, the UE may support at least one of the following cases 1 through 4:

[0113] [Case 1] Eight ports may be available. Two CDM groups similar to the existing DMRS port table may be maintained. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1} and CDM group #1 may correspond to DMRS port index {2,3}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001} and CDM group #1 may correspond to DMRS port index {1002,1003}.

[0114] [Case 2] 16 ports may be available. A 4CDM group may also be available, according to either option 1 or 2 below. [[Option 1]] Four CDM groups may be available by expanding / adding to existing two CDM groups. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1,4,5}, CDM group #1 to DMRS port index {2,3,6,7}, CDM group #2 to DMRS port index {8,9,10,13}, and CDM group #3 to DMRS port index {10,11,14,15}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000, 1001, 1004, 1005}, CDM group #1 to DMRS port index {1002, 1003, 1006, 1007}, CDM group #2 to DMRS port index {1008, 1009, 1012, 1013}, and CDM group #3 to DMRS port index {1010, 1011, 1014, 1015}. [[Option 2]] The new mapping order may make the 4CDM group available.

[0115] [Case 3] Twelve ports may be available. Three CDM groups similar to the existing DMRS port table may be maintained. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1,6,7}, CDM group #1 to DMRS port index {2,3,8,9}, and CDM group #2 to DMRS port index {4,5,10,11}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001,1006,1007}, CDM group #1 to DMRS port index {1002,1003,1008,1009}, and CDM group #2 to DMRS port index {1004,1005,1010,1011}.

[0116] [Case 4] 24 ports may be available. 6 CDM groups may also be available according to either option 3 or 4 below. [[Option 3]] Six CDM groups may be available by expanding / adding to the existing two CDM groups. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1,6,7}, CDM group #1 to DMRS port index {2,3,8,9}, CDM group #2 to DMRS port index {4,5,10,11}, CDM group #3 to DMRS port index {12,13,18,19}, CDM group #4 to DMRS port index {14,15,20,21}, and CDM group #5 to DMRS port index {16,17,22,23}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000, 1001, 1006, 1007}, CDM group #1 to DMRS port index {1002, 1003, 1008, 1009}, CDM group #2 to DMRS port index {1004, 1005, 1010, 1011}, CDM group #3 to DMRS port index {1012, 1013, 1018, 1019}, CDM group #4 to DMRS port index {1014, 1015, 1020, 1021}, and CDM group #5 to DMRS port index {1016, 1017, 1022, 1023}. [[Option 4]] The new mapping order may make 6CDM groups available.

[0117] Let's explain the example of PDSCH, which is option 1 / 3 in the aforementioned Case 2 / 4. It is similar to PUSCH, except that the DMRS port index starts from 0.

[0118] The number of CDM groups is increased in at least one of the following cases: when the number of DMRS ports for DMRS configuration type 1 is greater than 8, or when the number of DMRS ports for DMRS configuration type 2 is greater than 12.

[0119] In option 1 / 3, for each DMRS configuration type, a unified DMRS port table may be defined for both single-symbol DMRS and double-symbol DMRS, since the same DMRS port index belongs to the same CDM group for both single-symbol DMRS and double-symbol DMRS.

[0120] Figure 5 shows an example of a new DMRS port table for DMRS configuration type 1 related to option 1. In this example, even if the number of DMRS ports supported for DMRS configuration type 1 and single-symbol DMRS is increased to 8, the number of CDM groups remains 2.

[0121] Figure 6 shows an example of a new DMRS port table for DMRS configuration type 2 related to option 1. In this example, even if the number of DMRS ports supported for DMRS configuration type 2 and single-symbol DMRS is increased to 12, the number of CDM groups remains 2.

[0122] In option 2 / 4 of the aforementioned case 2 / 4, a new mapping order for DMRS CDM groups and DMRS port indexes may be specified.

[0123] Figure 7 shows an example of a new DMRS port table for DMRS configuration type 1 related to option 2. For PDSCH, CDM group #0 corresponds to DMRS port index {1000, 1001, 1008, 1009}, CDM group #1 corresponds to DMRS port index {1002, 1003, 1010, 1011}, CDM group #2 corresponds to DMRS port index {1004, 1005, 1012, 1013}, and CDM group #3 corresponds to DMRS port index {1006, 1007, 1014, 1015}.

[0124] Figure 8 shows an example of a new DMRS port table for DMRS configuration type 2 related to option 2. For PDSCH, CDM group #0 corresponds to DMRS port index {1000, 1001, 1012, 1013}, CDM group #1 corresponds to DMRS port index {1002, 1003, 1014, 1015}, CDM group #2 corresponds to DMRS port index {1004, 1005, 1016, 1016}, CDM group #3 corresponds to DMRS port index {1006, 1007, 1018, 1019}, CDM group #4 corresponds to DMRS port index {1008, 1009, 1020, 1021}, and CDM group #5 corresponds to DMRS port index {1010, 1011, 1022, 1023}.

[0125] In option 2 / 4, a unified DMRS port table may be specified for each DMRS configuration type, such that the same DMRS port index belongs to the same CDM group in both single-symbol DMRS and double-symbol DMRS.

[0126] 《Option 2》 The UE may support new CDM groups for extended DMRS configuration types 1 / 2 (e.g., Rel / 18DMRS configuration type 1 / 2). In this case, the UE may support at least one of the following cases 1 through 4.

[0127] [Case 1] Eight ports may be available. Four CDM groups may be available. Figure 9 shows an example of a new DMRS port table. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1}, CDM group #1 to DMRS port index {2,3}, CDM group #2 to DMRS port index {4,5}, and CDM group #3 to DMRS port index {6,7}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001}, CDM group #1 to DMRS port index {1002,1003}, CDM group #2 to DMRS port index {1004,1005}, and CDM group #3 to DMRS port index {1006,1007}.

[0128] [Case 2] 16 ports may be available. 4 CDM groups may be available. The mapping of CDM groups and DMRS port indices may be the same as option 1 / 3 of case 2 of option 1 above.

[0129] [Case 3] Twelve ports may be available. Six CDM groups may be available. Figure 10 shows an example of a new DMRS port table. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1}, CDM group #1 to DMRS port index {2,3}, CDM group #2 to DMRS port index {4,5}, CDM group #3 to DMRS port index {6,7}, CDM group #4 to DMRS port index {8,9}, and CDM group #5 to DMRS port index {10,11}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001}, CDM group #1 to DMRS port index {1002,1003}, CDM group #2 to DMRS port index {1004,1005}, CDM group #3 to DMRS port index {1006,1007}, CDM group #4 to DMRS port index {1008,1009}, and CDM group #5 to DMRS port index {1010,1011}.

[0130] [Case 4] 24 ports may be available. 6 CDM groups may be available. The mapping of CDM groups and DMRS port indices may be the same as options 2 / 4 of case 4 of option 1 described above.

[0131] If option 2 is adopted for a single-symbol DMRS, it may be aligned with options 2 / 4. In this case, a unified DMRS port table for single-symbol DMRS and double-symbol DMRS may be defined for each DMRS configuration type, such that the same DMRS port index belongs to the same CDM group for both single-symbol DMRS and double-symbol DMRS.

[0132] According to this embodiment, the UE can appropriately determine the relationship between the DMRS port and the CDM group.

[0133] <Embodiment #2> This embodiment relates to the DMRS series.

[0134] As shown in the example in Figure 11, the pseudo-random sequence generator for the pseudo-random sequence c(i) used to generate the DMRS sequence r(n) has an initial value of c init Initialized using . Rel.16 reduces PAPR to the same level as data symbols for all port combinations, CDM group-specific c init It supports this.

[0135] Similar to Rel.16 init In this case, identifier n - SCID λ- The following may be used. Here, n - λ- may be written by writing a hyphen (-) above n, and may be called n-bar. λ- may be written by writing a hyphen (-) above λ, and may be called λ-bar.

[0136] n for new values ​​of the CDM group index λ (e.g., λ=3,4,5) - SCID λ- This may be specified. For λ=0,2,4, n - SCID λ- = n SCID It may also be the case that, for λ=1,3,5, n - ID λ- = 1-n SCID It may also be the case that n for λ - ID λ- The formula, or not limited to this, may be given by other formulas. Here, N ID ^(n - SCID λ- ) is the scrambling ID (upper layer parameter N ID 0 , NID 1 (based on) or physical layer cell identity N ID cell n SCID The range is ∈{0,1}.

[0137] According to this embodiment, the UE can appropriately determine the relationship between the CDM group and the DMRS lineage.

[0138] <Embodiment #0-1> This embodiment relates to the mapping of CDM groups and DMRS ports.

[0139] In the CDM group in option 1 / 2 of Embodiment #1, a new concept of a CDM group list (list) may be introduced above the CDM group. The number of CDM groups and the order of CDM groups for each CDM group list may follow the existing DMRS port table. The CDM group list may support at least one of the following cases 1 to 4.

[0140] [Case 1] Eight ports may be available. Two CDM group lists may be available. Each CDM group list may have two CDM groups. Each CDM group may have two DMRS ports. List #1 may contain CDM groups {0,1}, and List #2 may contain CDM groups {2,3}.

[0141] [Case 2] 16 ports may be available. 2 CDM group lists may be available. There may be 2 CDM groups per CDM group list. There may be 4 DMRS ports per CDM group. List #1 may contain CDM groups {0,1}, and List #2 may contain CDM groups {2,3}.

[0142] [Case 3] Twelve ports may be available. Two CDM group lists may be available. There may be three CDM groups per CDM group list. There may be two DMRS ports per CDM group. List #1 may contain CDM groups {0,1,2}, and List #2 may contain CDM groups {3,4,5}.

[0143] [Case 4] 24 ports may be available. 2 CDM group lists may be available. There may be 3 CDM groups per CDM group list. There may be 4 DMRS ports per CDM group. List #1 may contain CDM groups {0,1,2}, and List #2 may contain CDM groups {3,4,5}.

[0144] For each DMRS port in the list, the order of the CDM groups in the existing DMRS port table may be reused. For the second list, the DMRS port index j in the DMRS port table may mean j + P, where P may be the number of DMRS ports in the list (the maximum number of DMRS ports in the list). For the second list, the DMRS CDM group index k in the DMRS port table may mean k + Q, where Q may be the number of DMRS CDM groups in the list (the maximum number of DMRS CDM groups in the list).

[0145] Figure 12 shows an example of a CDM group list for Case 1. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003} correspond to CDM groups {0, 0, 1, 1}, respectively. The mapping for List #1 is as shown in its DMRS port table. The mapping for List #2 is obtained by applying P=4 and Q=2 to the DMRS port table, so that DMRS port j+P corresponds to CDM group k+Q.

[0146] Figure 13 shows an example of a CDM group list for Case 2. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007} ​​correspond to CDM groups {0, 0, 1, 1, 0, 0, 1, 1}, respectively. The mapping for List #1 is as shown in its DMRS port table. The mapping for List #2 is obtained by applying P=8 and Q=2 to the DMRS port table, so that DMRS port j+P corresponds to CDM group k+Q.

[0147] Figure 14 shows an example of a CDM group list for Case 3. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003, 1004, 1005} correspond to CDM groups {0, 0, 1, 1, 2, 2}, respectively. The mapping for List #1 is as shown in its DMRS port table. The mapping for List #2 is obtained by applying P=6 and Q=3 to the DMRS port table, so that DMRS port j+P corresponds to CDM group k+Q.

[0148] Figure 15 shows an example of a CDM group list for Case 4. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011} correspond to CDM groups {0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2}, respectively. The mapping for List #1 is as shown in its DMRS port table. The mapping for List #2 is obtained by applying P=12 and Q=3 to the DMRS port table, so that DMRS port j+P corresponds to CDM group k+Q.

[0149] According to this embodiment, the number of CDM groups and DMRS ports can be appropriately increased.

[0150] <Embodiment #0-2> This embodiment relates to a DMRS structure.

[0151] In Rel.16 / 17, different CDM groups are subjected to FDM.

[0152] Because the received signals have a near-far problem (where signals received from nearby influence signals received from far away) between different UEs with different received powers, for MU-MIMO, the base station may assign different CDM groups to different UEs.

[0153] With the increasing number of CDM groups, the question arises as to how to allocate REs to these CDM groups.

[0154] Figure 16 shows an example of the mapping (allocation) from CDM groups to REs for DMRS configuration types 1 and 2. For DMRS configuration type 1, four CDM groups may be FDM using a comb structure with four transmit combs. For DMRS configuration type 2, six CDM groups may be FDM with two REs each.

[0155] -Analysis #2 For PUSCH, the antenna port indication (antenna port field) in DCI format 0_1 / 0_2 may indicate a CDM group number > 2 for DMRS configuration type 1 and a CDM group number > 3 for DMRS configuration type 2.

[0156] The existing antenna port table can only specify a CDM group count ≤ 2 for DMRS setting type 1, and only specify a CDM group count ≤ 3 for DMRS setting type 2.

[0157] In the existing antenna port tables for combinations of DMRS configuration type (dmrs-Type), DMRS maximum length (maxLength, maximum number of DMRS symbols), and rank, the antenna port indication value is associated with the number of DMRS CDM groups (number of DMRS CDM groups without data) and the DMRS port index. For DMRS configuration type 1 and DMRS maximum length = 1, Figure 17 shows an example of the existing antenna port tables for ranks 1, 2, 3, and 4. For DMRS configuration type 1 and DMRS maximum length = 2, Figures 18 and 19 show an example of the existing antenna port tables for ranks 1, 2, 3, and 4. For DMRS configuration type 2 and DMRS maximum length = 1, Figures 20 and 21 show an example of the existing antenna port tables for ranks 1, 2, 3, and 4. For DMRS configuration type 2 and DMRS maximum length = 2, Figures 22, 23, and 24 show an example of the existing antenna port tables for ranks 1, 2, 3, and 4.

[0158] The UE receives a DCI (DCI format) which includes the PUSCH resource allocation and the value of the antenna port instruction (antenna port field), and may control DMRS transmission based on the association between that value, the number of CDM groups, and the DMRS port.

[0159] The extension of the antenna port instructions for PUSCH may follow either direction #2-1 or #2-2 below.

[0160] --Direction #2-1 A new antenna port table may be defined for the following cases 1 to 4 (Embodiment #3-#7). [Case 1] DMRS configuration type 1, DMRS maximum length = 1, number of ports = 8, rank = 1 / 2 / 3 / 4 [Case 2] DMRS configuration type 1, DMRS maximum length = 2, number of ports = 16, rank = 1 / 2 / 3 / 4 [Case 3] DMRS configuration type 2, DMRS maximum length = 1, number of ports = 12, rank = 1 / 2 / 3 / 4 [Case 4] DMRS configuration type 2, DMRS maximum length = 2, number of ports = 24, rank = 1 / 2 / 3 / 4

[0161] The different options of Embodiment #1 describe different CDM grouping sequences / methods. For different CDM grouping methods, the DMRS port index within each CDM group may be different, and the antenna port table may be different. For simplicity and to make it applicable to all CDM grouping methods, in each of the following embodiments, i x,y (Alternatively, i_x,y) may represent the y-th DMRS port index within the x-th CDM group (CDM group #(x-1)), where x>=1 and y>=1.

[0162] For example, in the example of the DMRS port table (Figure 5) of option 1 of the above embodiment #, i 1,1 =1000, i 1,2 =1001, i 1,3 =1004, i 1,4 =1005, i 2,1 =1002, i 2,2 =1003, ...is also acceptable.

[0163] For example, in the example of the DMRS port table (Figure 7) of option 2 of option 1 in the above embodiment #, i 1,1 =1000, i 1,2 =1001, i 1,3 =1008, i 1,4 =1009, i 2,1 =1002, i 2,2 =1003, ...is also acceptable.

[0164] <Embodiment #3> This embodiment relates to a novel antenna port table for case 1 of PUSCH.

[0165] DMRS configuration type 1, DMRS maximum length = 1, and number of expansion ports (number of DMRS ports) = 8 may also be used (Case 1).

[0166] 《Scenario A》 Option 1 of Embodiment #1 may be applied to 2CDM groups for 8 ports. Four existing antenna port tables for Case 1 may be reused for Case 1 with an expanded number of ports. The field size (number of bits) of the antenna port indication may be increased to 4 bits.

[0167] 《Assumption B》 Option 2 of Embodiment #1 may be applied to a 4CDM group for 8 ports.

[0168] The field size (number of bits) of the antenna port indication may be increased so that the new antenna port table includes entries with DMRS CDM group numbers {3,4} without data. DMRS CDM group numbers 1,2,3,4 without data may refer to CDM groups {0},{0,1},{0,1,2},{0,1,2,3}, respectively. The antenna port table may be specified to have all or some of the entries in the following example of a new antenna port table. Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, and rank = 1 (Figure 25) Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, and rank = 2 (Figure 26) Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, rank = 3 (Table 1 in Figure 27) • Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, rank = 4 (second table in Figure 27)

[0169] The new antenna port table may be accompanied by assumptions regarding the order / method of CDM grouping in Option 2 of Embodiment #1. 1,1 =0, i 1,2 =1, i 2,1 =2, i 2,2 =3, i 3,1 =4, i 3,2 =5, i4,1 =6, i 4,2 =7, or it may be. The antenna port table may be specified to have all or some of the entries in the following example of a new antenna port table. Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, and rank = 1 (Figure 28) Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, and rank = 2 (Figure 29) Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, rank = 3 (Table 1 in Figure 30) Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 1, number of extended ports, rank = 4 (second table in Figure 30)

[0170] According to this embodiment, the antenna port indication in case 1 of the PUSCH can be properly performed.

[0171] <Embodiment #4> This embodiment relates to a novel antenna port table for case 2 of PUSCH.

[0172] DMRS configuration type 1, DMRS maximum length = 2, and number of expansion ports (number of DMRS ports) = 16 is also acceptable (Case 2).

[0173] The field size (number of bits) of the antenna port indication may be increased so that the new antenna port table includes entries with DMRS CDM group numbers {3,4} without data. DMRS CDM group numbers 1,2,3,4 without data may refer to CDM groups {0},{0,1},{0,1,2},{0,1,2,3}, respectively. The antenna port table may be specified to have all or some of the entries in the following example of a new antenna port table. Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 2, number of extended ports, and rank = 1 (Figure 31) Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 2, number of extended ports, and rank = 2 (Figure 32) Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 2, number of extended ports, rank = 3 (Table 1 in Figure 33) • Example of a new antenna port table with DMRS configuration type 1, DMRS maximum length = 2, number of extended ports, rank = 4 (second table in Figure 33)

[0174] In these examples, the forward (DMRS) symbol count may be 1 or 2. Some rows may be repeated using two values ​​(forward symbol count). For example, the four rows (rows with values ​​1 to 4) with CDM group count = 2 in the first antenna port table example in Figure 33 may be expanded to eight rows by being repeated with a different forward symbol count, as in the example in Figure 34.

[0175] According to this embodiment, the antenna port indication in case 2 of the PUSCH can be properly performed.

[0176] <Embodiment #5> This embodiment relates to a novel antenna port table for case 3 of PUSCH.

[0177] DMRS configuration type 2, DMRS maximum length = 1, and number of expansion ports (number of DMRS ports) = 12 is also acceptable (Case 3).

[0178] 《Scenario A》 Option 1 of Embodiment #1 may be applied to 3CDM groups for 12 ports. Four existing antenna port tables for Case 3 may be reused for Case 3 with an expanded number of ports. The field size (number of bits) of the antenna port indication may be increased to 5 bits.

[0179] 《Assumption B》 Option 2 of Embodiment #1 may be applied to a 6CDM group for 12 ports.

[0180] The field size (number of bits) of the antenna port indication may be increased so that the new antenna port table includes entries with DMRS CDM group numbers {4, 5, 6} without data. DMRS CDM group numbers 1, 2, 3, 4, 5, 6 without data may refer to CDM groups {0}, {0,1}, {0,1,2}, {0,1,2,3}, {0,1,2,3,4}, and {0,1,2,3,4,5}, respectively. The antenna port table may be specified to have all or some of the entries in the following example of a new antenna port table. Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 1, number of extended ports, and rank = 1 (Figure 35) Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 1, number of extended ports, and rank = 2 (Figure 36) Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 1, number of extended ports, rank = 3 (Table 1 in Figure 37) • Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 1, number of extended ports, rank = 4 (second table in Figure 37)

[0181] According to this embodiment, the antenna port indication in case 3 of the PUSCH can be properly performed.

[0182] <Embodiment #6> This embodiment relates to a novel antenna port table for case 4 of PUSCH.

[0183] DMRS configuration type 1, DMRS maximum length = 2, and number of expansion ports (number of DMRS ports) = 24 may also be used (Case 4).

[0184] The field size (number of bits) of the antenna port indication may be increased so that the new antenna port table includes entries with DMRS CDM group numbers {4, 5, 6} without data. DMRS CDM group numbers 1, 2, 3, 4 without data may refer to CDM groups {0}, {0,1}, {0,1,2}, {0,1,2,3}, {0,1,2,3,4}, and {0,1,2,3,4,5}, respectively. The antenna port table may be specified to have all or some of the entries in the following example of a new antenna port table. Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 1 (Figure 38) Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 2 (Figure 39) Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 3 (Figure 40) Example of a new antenna port table with DMRS configuration type 2, DMRS maximum length = 2, number of extended ports, and rank = 4 (Figure 41)

[0185] In these examples, the forward (DMRS) symbol count may be 1 or 2. Some rows may be repeated using two values ​​(for the forward symbol count).

[0186] According to this embodiment, the antenna port indication in case 4 of the PUSCH can be properly performed.

[0187] <Embodiment #7> This embodiment relates to the size (number of rows, field size, number of bits) of a new antenna port table / antenna port instruction for PUSCH.

[0188] A novel antenna port table having some of the entries in the antenna port table of Embodiment #3-6 may be specified.

[0189] Embodiment #7A The new antenna port table does not need to include all rows for all port indexes within each CDM group for a given value of "Number of DMRS CDM groups without data". The new antenna port table may include at least one port index within each CDM group.

[0190] In the example antenna port table for DMRS configuration type 1, DMRS maximum length = 2, extended port count, rank = 1 of Embodiment #4 (Figure 31), rows with antenna port indicator values ​​{5, 6, 7, 9, 10, 11, 13, 14, 15, 17, 18, 19, 21, 22, 23, 25, 26, 27, 29, 30, 31, 33, 34, 35, 37, 38, 39,...} may be deleted. The field size of the antenna port indicator may be reduced by maintaining one DMRS port per CDM group.

[0191] Embodiment #7B The new antenna port table does not need to include rows with port indexes spanning multiple CDM groups for a certain value of "Number of DMRS CDM groups without data". (If the rank is not greater than the number of port indexes per CDM group,) the new antenna port table may simply maintain rows with all port indexes within a single CDM group.

[0192] In the example antenna port table for DMRS configuration type 1, DMRS maximum length = 2, extended port count, rank = 2 (Figure 32) of Embodiment #4, rows with antenna port indicator values ​​{5, 6, 14, 15, 24, 25, 26, ...} may be deleted. The field size of the antenna port indicator may be reduced by maintaining one DMRS port per CDM group.

[0193] Embodiment #7C When the number of extended ports is set, a new field indicating whether the number of scheduled PDSCH / PUSCH exceeds a specific number may be added to the DCI. The specific number may be the existing number of CDM groups (supported number) for the set case, or the maximum number of existing DMRS ports (supported number) for the set case. That the number of scheduled PDSCH / PUSCH exceeds the specific number may mean that the number of scheduled users of the MU is larger than the number of supported users in Rel.15.

[0194] When the new field indicates that the number of scheduled PDSCH / PUSCH does not exceed the specific number, the existing antenna port table may be used for the antenna port indication.

[0195] When the new field indicates that the number of scheduled PDSCH / PUSCH exceeds the specific number, a new antenna port table may be used for the antenna port indication. In this method, the new antenna port table may include only entries with more CDM groups than the existing number or more DMRS ports than the existing number. For example, the number of DMRS ports > 4 for case 1, the number of DMRS ports > 8 for case 2, the number of DMRS ports > 6 for case 3, and the number of DMRS ports > 12 for case 4 may be applicable.

[0196] In the example of the antenna port table of DMRS setting type 1, DMRS maximum length = 2, extended port number, rank = 1 in Embodiment #4 (Fig. 31), the rows with antenna port indication values from 0 to 11 may be deleted.

[0197] [[ID=??]]実施形態#4のDMRS設定タイプ1、DMRS最大長=2、拡張ポート数、ランク=2のアンテナポートテーブルの例(図32)において、アンテナポート指示の値0から7の行は削除されてもよい。

[0198] It seems there is a problem with the numbering in your original text. The "実施形態#4のDMRS設定タイプ1、DMRS最大長=2、拡張ポート数、ランク=2のアンテナポートテーブルの例(図32)において、アンテナポート指示の値0から7の行は削除されてもよい。" part's ID is missing in the original numbering sequence. I've translated it as best as possible with the given context. If you can correct the ID numbering or clarify the content, that would be great.For reducing the size of the new antenna port table (the field size of the antenna port indication), at least two of Embodiments #7A, #7B, and #7C may be combined.

[0199] According to this embodiment, the size of the antenna port indication / antenna port table can be reduced.

[0200] --Direction #2-2 The UE may reuse the existing antenna port table for each list by a new implementation using a new setting / indication (Embodiment #8).

[0201] <Embodiment #8> This embodiment relates to the reuse of the existing antenna port table for PUSCH.

[0202] This embodiment may assume that Embodiment #0 is used.

[0203] A new field (list indication field) for indicating at least one of whether to apply one list or one list for the scheduled PUSCH (number of lists, number of lists for rate matching) and the list index may be added to DCI format 0_1 / 0_2 (that schedules the PUSCH). For the antenna port indication, the existing antenna port table may be reused for each list.

[0204] If the new field indicates a single list, the existing antenna port table and the DMRS port index for antenna port indication may be used. By default, that single list may be the first list. If the new field indicates a single list, the UE does not have to send data on the RE indicated by the DMRS RE in the first list (it may perform rate matching for that PUSCH around the RE indicated by the DMRS RE in the first list). If the antenna port field indicates a row with the number of CDM groups x, not sending data on the RE indicated by the DMRS RE in the first list may mean rate matching on all DMRS ports in the x CDM groups in the first list.

[0205] Whether or not data is mapped to REs not used in DMRS may be indicated by the DCI (which schedules the PUSCH / PDSCH) (similar to the "number of CDM groups without data" in Rel. 15). The number of CDM groups without data may be set by upper-layer signaling.

[0206] The list size may be determined by higher-layer signaling. Other parameters, such as the maximum number of DMRS ports and the maximum number of DMRS CDM groups, may also be determined by higher-layer signaling, and the UE may determine the list size based on those parameters.

[0207] If one list is specified, it may mean that users whose PUSCH / PDSCH is scheduled and multiplexed with the UE will occupy only one DMRS port in one list (default is list #1). The UE may perform rate matching around the DMRS RE in one list. If two lists are specified, it may mean that users whose PUSCH / PDSCH is scheduled and multiplexed with the UE will occupy the DMRS ports in two lists. The UE may perform rate matching around the DMRS RE in two lists.

[0208] If the new field points to a single list, the new field may include a list index. If the new field points to a single list and a list index, that single list may be the list corresponding to that list index.

[0209] If the new field refers to two lists (list #1 and list #2), the new field may also include list indexes.

[0210] If a second list is indicated by a list index, then in the antenna port table, the indicated DMRS port index j may be considered as DMRS port j + P, where P may be the maximum number of DMRS ports per list. The number of DMRS CDM groups {1, 2, 3} without data may refer to the CDM groups in the second list.

[0211] If the first list is indicated by the list index, then in the antenna port table, the indicated DMRS port index j may be DMRS port j. The number of DMRS CDM groups {1, 2, 3} without data may refer to the CDM groups in the first list.

[0212] If a new field indicates two lists, the UE does not have to send data on the REs indicated by the DMRS REs in the two lists. The UE may follow either rate matching 1 or 2 below. [Rate Matching 1] The UE performs rate matching around the DMRS RE in all DMRS ports within those two lists. [Rate Matching 2] The UE performs rate matching around the DMRS RE in all DMRS ports in the first list and a specific DMRS port in the second list. An additional field (CDM group count field) may be added (to its DCI) to indicate the number of CDM groups in the second list for rate matching. The additional field may only apply if the DMRS RE location of the j-th port in the two lists is different. If the second list is indicated by the list index, the additional field is not required, and the UE may follow the antenna port field for the CDM group count for rate matching. If the first list is indicated by the list index, the additional field is valid, and the UE may follow the indicated CDM group count for rate matching.

[0213] For example, the value of the new field may specify the following: The value 00 may indicate one list for rate matching and an antenna port designation (in the default list #1) for that DMRS. The value 01 may indicate two lists for rate matching and an antenna port instruction in list #1 for that DMRS. The value 10 may indicate two lists for rate matching and an antenna port instruction in list #2 for that DMRS. The value 11 may be reserved.

[0214] As a variation, even if only one list is indicated and a list index is required, it may be used. For example, the value of the new field may indicate the following. · Value 00 may indicate one list for rate matching and the antenna port indication in list #1 for its DMRS. · Value 01 may indicate one list for rate matching and the antenna port indication in list #2 for its DMRS. · Value 10 may indicate two lists for rate matching and the antenna port indication in list #1 for its DMRS. · Value 11 may indicate two lists for rate matching and the antenna port indication in list #2 for its DMRS.

[0215] In Embodiments #3 to #7, some new entries with DMRS port indexes in lists #1 and #2 may be introduced. This makes the indication more flexible.

[0216] For example, in an example of an existing antenna port table (Figure 17) for PUSCH, DMRS configuration type 1, DMRS maximum length = 1, and rank = 1, the interpretation of the existing antenna port table may follow the following. · In list #1, the number of DMRS CDM groups 1, 2 without data may respectively refer to CDM groups {0}, {0, 1}. · In list #2, the number of DMRS CDM groups 1, 2 without data may respectively refer to CDM groups {2}, {2, 3} in list #2. · If two lists are indicated and list #2 is indicated, the port index j may mean the j-th port in list #2. In case 1, the port index j may be index j + P = j + 4 in list #2. For list #2, DMRS ports 0, 1, 2, 3 may be respectively interpreted as DMRS ports 4, 5, 6, 7.

[0217] According to this embodiment, the number of DMRS ports can be increased without changing the antenna port table.

[0218] -Analysis #3 (Similar to PUSCH) For PDSCH, the antenna port indication in DCI format 1_1 / 1_2 may indicate a CDM group number > 2 for DMRS configuration type 1 and a CDM group number > 3 for DMRS configuration type 2.

[0219] The existing antenna port table can only specify a CDM group count ≤ 2 for DMRS setting type 1, and a CDM group count ≤ 3 for DMRS setting type 2. Figure 42 shows an example of the existing antenna port table for PDSCH, DMRS setting type = 1, and DMRS maximum length = 1. Figure 43 shows an example of the existing antenna port table for PDSCH, DMRS setting type = 1, and DMRS maximum length = 2. Figure 44 shows an example of the existing antenna port table for PDSCH, DMRS setting type = 2, and DMRS maximum length = 1. Figure 45 shows an example of the existing antenna port table for PDSCH, DMRS setting type = 2, and DMRS maximum length = 2.

[0220] Antenna port designations in existing DCI formats 1_1 / 1_2 follow the existing DMRS port table. DMRS CDM group numbers 1, 2, and 3 without data may refer to CDM groups {0}, {0,1}, and {0,1,2}, respectively.

[0221] The UE receives a DCI (DCI format) which includes the resource allocation of the PDSCH and the value of the antenna port instruction (antenna port field), and may control DMRS transmission based on the association between that value, the number of CDM groups, and the DMRS port.

[0222] The extension of the antenna port instructions for PDSCH may follow either of the following directions #3-1 and #3-2.

[0223] --Direction #3-1 A new antenna port table may be defined for the following cases 1 to 4 (Embodiment #9). [Case 1] DMRS configuration type 1, DMRS maximum length = 1, number of ports = 8 [Case 2] DMRS configuration type 1, DMRS maximum length = 2, number of ports = 16 [Case 3] DMRS configuration type 2, DMRS maximum length = 1, number of ports = 12 [Case 4] DMRS configuration type 2, DMRS maximum length = 2, number of ports = 24

[0224] <Embodiment #9> This embodiment relates to a novel antenna port table for PDSCH.

[0225] A novel antenna port table for the PDSCH may be defined in the same manner as in Embodiment #3-6.

[0226] Similar to Embodiment #7, a novel antenna port table having some entries in the antenna port table for PDSCH based on Embodiment #3-6 may be specified.

[0227] Case 1 DMRS configuration type 1, DMRS maximum length = 1, and number of expansion ports (number of DMRS ports) = 8 may also be used (Case 1).

[0228] 《Scenario A》 Option 1 of Embodiment #1 may be applied to 2CDM groups for 8 ports. Four existing antenna port tables for Case 1 may be reused for Case 1 with an expanded number of ports. The field size (number of bits) of the antenna port indication may be increased to 5 bits.

[0229] 《Concept B》 Option 2 of Embodiment #1 may be applied to a 4CDM group for 8 ports.

[0230] The field size (number of bits) of the antenna port indication may be increased so that the new antenna port table includes entries with DMRS CDM group numbers {3,4} without data. DMRS CDM group numbers 1,2,3,4 without data may refer to CDM groups {0},{0,1},{0,1,2},{0,1,2,3}, respectively. The antenna port table may be defined to have all or some of the entries in the example of the new antenna port table (DMRS configuration type 1, DMRS maximum length = 1, extended port count case) shown in Figure 46.

[0231] Case 2 DMRS configuration type 1, DMRS maximum length = 2, and number of expansion ports (number of DMRS ports) = 16 is also acceptable (Case 2).

[0232] The field size (number of bits) of the antenna port indication may be increased so that the new antenna port table includes entries with DMRS CDM group numbers {3,4} without data. DMRS CDM group numbers 1,2,3,4 without data may refer to CDM groups {0},{0,1},{0,1,2},{0,1,2,3}, respectively. The antenna port table may be defined to have all or some entries of the example of the new antenna port table (DMRS configuration type 1, DMRS maximum length = 2, extended port count case) combining the first part of Figure 47, the second part of Figure 48, and the third part of Figure 49.

[0233] The number of forward (DMRS) symbols may be 1 or 2. A row may be repeated using two rows that differ only in the number of forward symbols.

[0234] The new antenna port table for Case 3 / 4 will be larger, so it will not be illustrated, but it can be based on the same concept as Case 1 / 2.

[0235] According to this embodiment, antenna port instructions can be properly given to the PDSCH.

[0236] --Direction #3-2 The UE may reuse existing antenna port tables per list by a new implementation using new settings / instructions (Embodiment #10).

[0237] <Embodiment #10> This embodiment relates to the reuse of an existing antenna port table for a PDSCH.

[0238] Similar to Embodiment #8, an existing antenna port table for the PDSCH may be reused.

[0239] This embodiment may assume that Embodiment #0 is being used.

[0240] A new field (list instruction field) may be added to the DCI format 0_1 / 0_2 (for scheduling the PDSCH) to indicate whether to apply one list or one list (number of lists, number of lists for rate matching), and at least one of the list indexes for the scheduled PDSCH. For antenna port instruction, an existing antenna port table may be reused for each list.

[0241] If the new field indicates a single list, the existing antenna port table and the DMRS port index for antenna port indication may be used. By default, that single list may be the first list. If the new field indicates a single list, the UE does not have to receive data on the RE indicated by the DMRS RE in the first list (it may perform rate matching for that PDSCH around the RE indicated by the DMRS RE in the first list). If the antenna port field indicates a row with the number of CDM groups x, not receiving data on the RE indicated by the DMRS RE in the first list may mean rate matching on all DMRS ports in the x CDM groups in the first list.

[0242] Whether or not data is mapped to REs not used in DMRS may be indicated by the DCI (which schedules the PUSCH / PDSCH) (similar to the "number of CDM groups without data" in Rel. 15). The number of CDM groups without data may be set by upper-layer signaling.

[0243] The list size may be determined by higher-layer signaling. Other parameters, such as the maximum number of DMRS ports and the maximum number of DMRS CDM groups, may also be determined by higher-layer signaling, and the UE may determine the list size based on those parameters.

[0244] If one list is specified, it may mean that users whose PUSCH / PDSCH is scheduled and multiplexed with the UE will occupy only one DMRS port in one list (default is list #1). The UE may perform rate matching around the DMRS RE in one list. If two lists are specified, it may mean that users whose PUSCH / PDSCH is scheduled and multiplexed with the UE will occupy the DMRS ports in two lists. The UE may perform rate matching around the DMRS RE in two lists.

[0245] If the new field points to a single list, the new field may include a list index. If the new field points to a single list and a list index, that single list may be the list corresponding to that list index.

[0246] If the new field refers to two lists (list #1 and list #2), the new field may also include list indexes.

[0247] If a second list is indicated by a list index, then in the antenna port table, the indicated DMRS port index j may be considered as DMRS port j + P, where P may be the maximum number of DMRS ports per list. The number of DMRS CDM groups {1, 2, 3} without data may refer to the CDM groups in the second list.

[0248] If the first list is indicated by the list index, then in the antenna port table, the indicated DMRS port index j may be DMRS port j. The number of DMRS CDM groups {1, 2, 3} without data may refer to the CDM groups in the first list.

[0249] If a new field indicates two lists, the UE does not have to receive data on the RE indicated by the DMRS RE in the two lists. The UE may follow either rate matching 1 or 2 below. [Rate Matching 1] The UE performs rate matching around the DMRS RE in all DMRS ports within those two lists. [Rate Matching 2] The UE performs rate matching around the DMRS RE in all DMRS ports in the first list and a specific DMRS port in the second list. An additional field (CDM group count field) may be added (to its DCI) to indicate the number of CDM groups in the second list for rate matching. The additional field may only apply if the DMRS RE location of the j-th port in the two lists is different. If the second list is indicated by the list index, the additional field is not required, and the UE may follow the antenna port field for the CDM group count for rate matching. If the first list is indicated by the list index, the additional field is valid, and the UE may follow the indicated CDM group count for rate matching.

[0250] For example, the value of the new field may specify the following: The value 00 may indicate one list for rate matching and an antenna port designation (in the default list #1) for that DMRS. The value 01 may indicate two lists for rate matching and an antenna port instruction in list #1 for that DMRS. The value 10 may indicate two lists for rate matching and an antenna port instruction in list #2 for that DMRS. The value 11 may be reserved.

[0251] As a variation, even if only one list is specified, a list index may be required. For example, the value of the new field may be as follows: The value 00 may indicate one list for rate matching and an antenna port designation in list #1 for that DMRS. The value 01 may indicate one list for rate matching and an antenna port designation in list #2 for that DMRS. The value 10 may indicate two lists for rate matching and an antenna port instruction in list #1 for that DMRS. The value 11 may indicate two lists for rate matching and an antenna port instruction in list #2 for that DMRS.

[0252] In Embodiment #9, several new entries with DMRS port indices may be introduced in Lists #1 and #2. This makes the instructions more flexible.

[0253] For example, in the case of an existing antenna port table (Figure 43) for PDSCH, DMRS setting type 1, and DMRS maximum length = 1, the interpretation of the existing antenna port table may follow the following: In List #1, the DMRS CDM group numbers 1 and 2, which do not have data, may refer to CDM groups {0} and {0,1}, respectively. In List #2, the DMRS CDM group numbers 1 and 2 without accompanying data may refer to the CDM groups {2} and {2,3} in List #2, respectively. If two lists are given and list #2 is given, port index j may mean the j-th port in list #2. In case 2, port index j may also mean index j+P=j+8 in list #2. For list #2, DMRS ports 0, 1, 2, 3 may be interpreted as DMRS ports 4, 5, 6, 7, respectively.

[0254] According to this embodiment, the number of DMRS ports can be increased without changing the antenna port table.

[0255] -Analysis #4 The number of DMRS CDM groups may not increase, but the number of DMRS ports per CDM group may increase.

[0256] The question then arises as to how the mapping between DMRS ports and CDM groups is performed. In the following embodiments, consideration is given to using existing mappings / sequences as much as possible.

[0257] The issue is how to use existing antenna port tables / existing DMRS port tables for antenna port instruction to PDSCH / PUSCH. In the following embodiments, consideration is given to using existing antenna port tables / existing DMRS port tables as much as possible.

[0258] The UE may receive DMRS configurations and control the sending and receiving of DMRS based on one or more associations between multiple CDM groups and multiple DMRS ports, and the configurations. The number of DMRS ports for DMRS configuration type 1 may be greater than 8, and the number of DMRS ports for DMRS configuration type 2 may be greater than 12.

[0259] <Embodiment #11> This embodiment relates to the mapping of CDM groups and DMRS ports.

[0260] A new concept of CDM group subsets (group subsets) may be introduced under the CDM group. The number of CDM groups and the order of CDM groups within each CDM group subset may follow the existing DMRS port table. A CDM group subset may support at least one of the following cases 1 through 4.

[0261] [Case 1] There may be 8 ports available. There may be 2 CDM groups available. There may be 2 group subsets for each CDM group. There may be 4 DMRS ports for each CDM group. Group subsets #1 and #2 may each correspond to CDM group {0,1}.

[0262] [Case 2] 16 ports may be available. 2 CDM groups may be available. Each CDM group may have 2 group subsets. Each CDM group may have 8 DMRS ports. Group subsets #1 and #2 may each correspond to CDM group {0,1}.

[0263] [Case 3] Twelve ports may be available. Three CDM groups may be available. Each CDM group may have two group subsets. Each CDM group may have four DMRS ports. Group subsets #1 and #2 may each correspond to CDM groups {0, 1, 2}.

[0264] [Case 4] 24 ports may be available. 3 CDM groups may be available. Each CDM group may have 2 group subsets. Each CDM group may have 8 DMRS ports. Group subsets #1 and #2 may each correspond to CDM groups {0,1,2}.

[0265] For each group subset, the order of the CDM groups in the existing DMRS port table may be reused. For the second group subset, the DMRS port index j in the DMRS port table may mean j + P, where P may be the number of DMRS ports in the group subset (the maximum number of DMRS ports in the group subset). For the first group subset, the DMRS port index j in the DMRS port table may mean j.

[0266] Figure 50 shows an example of a group subset for Case 1. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003} correspond to CDM groups {0, 0, 1, 1}, respectively. The mapping for group subset #1 is as shown in its DMRS port table. The actual mapping for group subset #2 is achieved by applying P=4 to the DMRS port table, so that DMRS ports j+P={1004, 1005, 1006, 1007} ​​correspond to CDM groups {0, 0, 1, 1}, respectively.

[0267] Figure 51 shows an example of a group subset for Case 2. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007} ​​correspond to CDM groups {0, 0, 1, 1, 0, 0, 1, 1}, respectively. The mapping for group subset #1 is as shown in its DMRS port table. The actual mapping for group subset #2 is obtained by applying P=8 to the DMRS port table, so that DMRS ports j+P={1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015} correspond to CDM groups {0, 0, 1, 1, 0, 0, 1, 1}, respectively.

[0268] Figure 52 shows an example of a group subset for Case 3. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003, 1004, 1005} correspond to CDM groups {0, 0, 1, 1, 2, 2}, respectively. The mapping for group subset #1 is as shown in its DMRS port table. The actual mapping for group subset #2 is obtained by applying P=6 to the DMRS port table, so that DMRS ports j+P={1006, 1007, 1008, 1009, 1010, 1011} correspond to CDM groups {0, 0, 1, 1, 2, 2}, respectively.

[0269] Figure 53 shows an example of a group subset for Case 4. In the DMRS port table, DMRS ports {1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011} correspond to CDM groups {0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2}, respectively. The mapping for group subset #1 is as shown in its DMRS port table. The actual mapping for group subset #2 is done by applying P=12 to the DMRS port table, so that DMRS ports j+P={1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023} correspond to CDM groups {0,0,1,1,2,2,0,0,1,1,2,2} respectively.

[0270] According to this embodiment, the number of DMRS ports can be appropriately increased.

[0271] <Embodiment #12> This embodiment relates to the reuse of an existing antenna port table.

[0272] A new field (group subset instruction field) may be added to the DCI format 0_1 / 0_2 / 1_1 / 1_2 (for scheduling the PUSCH / PDSCH) to indicate whether to apply one group subset or one group subset (number of group subsets, number of group subsets for rate matching) to the scheduled PUSCH / PDSCH, and at least one of the group subset indexes. An existing antenna port table may be reused for antenna port instruction for each group subset.

[0273] If a new field indicates a single group subset, the existing antenna port table and the DMRS port index for antenna port indication may be used. By default, that single group subset may be the first group subset. If a new field indicates a single group subset, the UE does not have to send / receive data on the RE indicated by the DMRS RE in the first group subset (it may perform rate matching for that PUSCH / PDSCH around the RE indicated by the DMRS RE in the first group subset). If the antenna port field indicates a row with the number of CDM groups x, not sending / receiving data on the RE indicated by the DMRS RE in the first group subset may mean rate matching on all DMRS ports in the x CDM groups in the first group subset.

[0274] Whether or not data is mapped to REs not used in DMRS may be indicated by the DCI (which schedules the PUSCH / PDSCH) (similar to the "number of CDM groups without data" in Rel. 15). The number of CDM groups without data may be set by upper-layer signaling.

[0275] The number of group subsets may be determined by higher-layer signaling. Other parameters, such as the maximum number of DMRS ports and the maximum number of DMRS CDM groups, may also be determined by higher-layer signaling, and the UE may determine the number of group subsets based on these parameters.

[0276] If one group subset is specified, it may mean that users whose PUSCH / PDSCH is scheduled and multiplexed with the UE will occupy only the DMRS ports within that one group subset (by default, group subset #1). The UE may perform rate matching around the DMRS RE within that group subset. If two group subsets are specified, it may mean that users whose PUSCH / PDSCH is scheduled and multiplexed with the UE will occupy the DMRS ports within the two group subsets. The UE may perform rate matching around the DMRS RE within the two group subsets.

[0277] If the new field points to a single group subset, the new field may include a group subset index. If the new field points to a single group subset and a group subset index, that single group subset may be the group subset corresponding to that group subset index.

[0278] If the new field indicates two group subsets (group subset #1 and group subset #2), the new field may include a group subset index.

[0279] If a second group subset is indicated by a group subset index, the indicated DMRS port index j may be considered as DMRS port j + P in the antenna port table, where P may be the maximum number of DMRS ports per group subset. DMRS CDM group numbers {1, 2, 3} without data may refer to CDM groups within the second group subset.

[0280] If the group subset index indicates the first group subset, then in the antenna port table, the indicated DMRS port index j may be DMRS port j. DMRS CDM group numbers {1, 2, 3} without data may refer to CDM groups within the first group subset.

[0281] If a new field indicates two group subsets, the UE does not have to send / receive data on the REs indicated by the DMRS REs within the two group subsets. The UE may follow either rate matching 1 or 2 below. [Rate Matching 1] The UE performs rate matching around the DMRS RE in all DMRS ports within those two group subsets. [Rate Matching 2] The UE performs rate matching around the DMRS RE in all DMRS ports in the first group subset and a specific DMRS port in the second group subset. An additional field (CDM group count field) may be added (to its DCI) to indicate the number of CDM groups in the second group subset for rate matching. The additional field may only apply if the DMRS RE location of the j-th port in the two group subsets is different. If the second group subset is indicated by the group subset index, the additional field is not required, and the UE may follow the antenna port field for the CDM group count for rate matching. If the first group subset is indicated by the group subset index, the additional field is valid, and the UE may follow the indicated CDM group count for rate matching.

[0282] For example, the value of the new field may specify the following: The value 00 may indicate one group subset for rate matching and an antenna port instruction for that DMRS (within the default group subset #1). The value 01 may indicate two group subsets for rate matching, and an antenna port instruction within group subset #1 for its DMRS. The value 10 may indicate two group subsets for rate matching, and an antenna port instruction within group subset #2 for its DMRS. The value 11 may be reserved.

[0283] As a variation, even if only one group subset is specified, a group subset index may still be required. For example, the value of the new field may specify the following: The value 00 may indicate one group subset for rate matching and an antenna port instruction within group subset #1 for that DMRS. The value 01 may indicate one group subset for rate matching and an antenna port instruction within group subset #2 for that DMRS. The value 10 may indicate two group subsets for rate matching, and an antenna port instruction within group subset #1 for its DMRS. The value 11 may indicate two group subsets for rate matching, and an antenna port instruction within group subset #2 for its DMRS.

[0284] In embodiments #3 to #7, several new entries may be introduced with DMRS port indices within group subsets #1 and #2. This makes the instructions more flexible.

[0285] For example, in the case of an existing antenna port table (Figure 17) for DMRS configuration type 1 and DMRS maximum length = 1, the interpretation of the existing antenna port table may follow the following: • DMRS CDM group numbers 1 and 2 without accompanying data may refer to CDM groups {0} and {0,1}, respectively. In group subset #1, CDM group 0 may correspond to DMRS port index {0,1}, and CDM group 1 may correspond to DMRS port index {2,3}. In group subset #2, CDM group 0 may correspond to DMRS port index {4,5}, and CDM group 1 may correspond to DMRS port index {6,7}. If two group subsets are specified, and group subset #2 is specified, port index j may mean the j-th port in group subset #2. Port index j may also mean index j+P=j+4 in group subset #2. For group subset #2, DMRS ports 0, 1, 2, and 3 may be interpreted as DMRS ports 4, 5, 6, and 7, respectively.

[0286] According to this embodiment, the number of DMRS ports can be increased without changing the antenna port table.

[0287] <Variations> This embodiment relates to variations applicable to embodiments #8 / #10 / #12.

[0288] In embodiments #8 / #10, the j-th DMRS port in list #1 (port index j) and the j-th DMRS port in list #2 (port index j+P) can occupy the same DMRS RS (are mapped to the same DMRS RS).

[0289] In Embodiment #12, the j-th DMRS port in group subset #1 (port index j) and the j-th DMRS port in group subset #2 (port index j+P) can occupy the same DMRS RS (are mapped to the same DMRS RS).

[0290] In these situations, rate matching at the j-th DMRS port in one list / group subset may have the same effect as rate matching at the j-th DMRS port in two list / group subsets. Rate matching at all DMRS ports in one list / group subset may have the same effect as rate matching at all DMRS ports in two list / group subsets. In this case, the following variations may apply. • Instructions for one or two lists (one group subset or two group subsets) for rate matching may not be required. A new instruction (new field) may be introduced to specify the list index / group subset index for antenna port instructions. Antenna port instructions can be interpreted based on the list index / group subset index. If a second list / group subset is specified, the interpretation of the existing table may be the same as in embodiments #8 / #10 / #12. In embodiments #8 / #10, for the second list, the specified DMRS port index j in the existing DMRS port table may be considered as DMRS port j+P, and the CDM group numbers 1, 2, and 3 without data may refer to the CDM groups in the second list. In embodiment #12, for the second group subset, the specified DMRS port index j in the existing DMRS port table may be considered as DMRS port j+P. Rate matching may be the same as in existing specifications. If the antenna port field indicates a row with the number of CDM groups x, it may mean rate matching on all DMRS ports within x CDM groups.

[0291] <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.

[0292] 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)."

[0293] 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)."

[0294] 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., according to Rel. 15 / 16)."

[0295] 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.

[0296] 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). • 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.

[0297] UE capability may represent at least one of the following values: • Number of DMRS ports.

[0298] Based on the above UE capabilities / higher layer parameters, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0299] (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.

[0300] Figure 54 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).

[0301] 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.

[0302] 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.

[0303] 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))).

[0304] 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.

[0305] 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).

[0306] 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.

[0307] 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).

[0308] 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.

[0309] 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.

[0310] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0311] 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).

[0312] 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.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0322] 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.

[0323] 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.

[0324] 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).

[0325] (base station) Figure 55 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.

[0326] 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.

[0327] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] The transmitting / receiving unit 120 may transmit a demodulation reference signal (DMRS) setting. The control unit 110 may control the transmission and reception of the DMRS based on one or more associations between a plurality of code division multiplexing (CDM) groups and a plurality of DMRS ports, and the setting. The number of the plurality of CDM groups for DMRS setting type 1 may be greater than 2, and the number of the plurality of CDM groups for DMRS setting type 2 may be greater than 3.

[0343] The transmitting / receiving unit 120 may transmit downlink control information including resource allocation for the physical uplink shared channel and an antenna port instruction value. The control unit 110 may control DMRS reception based on the association between the value, the number of code division multiplexing (CDM) groups, and the demodulation reference signal (DMRS) port. The number of CDM groups for DMRS setting type 1 may be greater than 2, and the number of CDM groups for DMRS setting type 2 may be greater than 3.

[0344] The transmitting / receiving unit 120 may transmit downlink control information including resource allocation for the physical downlink shared channel and an antenna port instruction value. The transmission of DMRS may be controlled based on the association between the value, the number of code division multiplexing (CDM) groups, and the demodulation reference signal (DMRS) port. The number of CDM groups for DMRS configuration type 1 may be greater than 2, and the number of CDM groups for DMRS configuration type 2 may be greater than 3.

[0345] The transmitting / receiving unit 120 may transmit a demodulation reference signal (DMRS) setting. The control unit 110 may control the transmission and reception of the DMRS based on one or more associations between a plurality of code division multiplexing (CDM) groups and a plurality of DMRS ports, and the setting. The number of the plurality of DMRS ports for DMRS setting type 1 may be greater than 8, and the number of the plurality of DMRS ports for DMRS setting type 2 may be greater than 12. The plurality of DMRS ports may include a first plurality of DMRS ports and a second plurality of DMRS ports.

[0346] (User terminal) Figure 56 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.

[0347] 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.

[0348] 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.

[0349] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0350] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0351] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0352] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0353] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0354] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0355] 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.

[0356] 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.

[0357] 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.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] The transmitting / receiving unit 220 may receive the demodulation reference signal (DMRS) settings. The control unit 210 may control the transmission and reception of the DMRS based on one or more associations between a plurality of code division multiplexing (CDM) groups and a plurality of DMRS ports, and the settings. The number of the plurality of CDM groups for DMRS setting type 1 may be greater than 2, and the number of the plurality of CDM groups for DMRS setting type 2 may be greater than 3.

[0364] The plurality of CDM ports may include a first plurality of CDM groups and a second plurality of CDM groups. The plurality of DMRS ports may include a first plurality of DMRS ports and a second plurality of DMRS ports. The number of the plurality of DMRS ports for DMRS configuration type 1 may be greater than 8, and the number of the plurality of DMRS ports for DMRS configuration type 2 may be greater than 12.

[0365] The one or more associations may include a first association between the first plurality of CDM groups and the first plurality of DMRS ports, and a second association between the second plurality of CDM groups and the second plurality of DMRS ports.

[0366] The one or more associations may include a first association between the first plurality of CDM groups and the first plurality of DMRS ports. The control unit 210 may determine one index of the second plurality of DMRS ports by adding a first number to one index of the first plurality of DMRS ports, and the control unit 210 may determine one index of the second plurality of CDM groups by adding a second number to one index of the first plurality of CDM groups.

[0367] The transmitting / receiving unit 220 may receive downlink control information, including resource allocation for the physical uplink shared channel and the value of the antenna port instruction. The control unit 210 may control DMRS transmission based on the association between the value, the number of code division multiplexing (CDM) groups, and the demodulation reference signal (DMRS) port. The number of CDM groups for DMRS setting type 1 may be greater than 2, and the number of CDM groups for DMRS setting type 2 may be greater than 3.

[0368] The number of DMRS ports for DMRS configuration type 1 may be greater than 8, and the number of DMRS ports for DMRS configuration type 2 may be greater than 12.

[0369] The association may include an association between the index of the CDM group and the index of the DMRS port.

[0370] The first plurality of DMRS ports may be associated with the first plurality of CDM groups, and the second plurality of DMRS ports may be associated with the second plurality of CDM groups. The control unit 210 may determine one index of the second plurality of DMRS ports among the plurality of DMRS ports by adding a first number to one index of the first plurality of DMRS ports.

[0371] The transmitting / receiving unit 220 may receive downlink control information, including resource allocation for the physical downlink shared channel and the value of the antenna port instruction. The control unit 210 may control DMRS reception based on the association between the value, the number of code division multiplexing (CDM) groups, and the demodulation reference signal (DMRS) port. The number of CDM groups for DMRS setting type 1 may be greater than 2, and the number of CDM groups for DMRS setting type 2 may be greater than 3.

[0372] The number of DMRS ports for DMRS configuration type 1 may be greater than 8, and the number of DMRS ports for DMRS configuration type 2 may be greater than 12.

[0373] The association may include an association between the index of the CDM group and the index of the DMRS port.

[0374] The first plurality of DMRS ports may be associated with the first plurality of CDM groups, and the second plurality of DMRS ports may be associated with the second plurality of CDM groups. The control unit 210 may determine one index of the second plurality of DMRS ports among the plurality of DMRS ports by adding a first number to one index of the first plurality of DMRS ports.

[0375] The transmitting / receiving unit 220 may receive a demodulation reference signal (DMRS) setting. The control unit 210 may control the transmission and reception of the DMRS based on one or more associations between a plurality of code division multiplexing (CDM) groups and a plurality of DMRS ports, and the setting. The number of the plurality of DMRS ports for DMRS setting type 1 may be greater than 8, and the number of the plurality of DMRS ports for DMRS setting type 2 may be greater than 12. The plurality of DMRS ports may include a first plurality of DMRS ports and a second plurality of DMRS ports.

[0376] The first set of DMRS ports may be associated with the set of CDM groups, and the second set of DMRS ports may be associated with the set of CDM groups.

[0377] The control unit 210 may determine one index of the second plurality of DMRS ports by adding a first number to one index of the first plurality of DMRS ports.

[0378] The control unit 210 may perform rate matching based on the settings.

[0379] (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.

[0380] 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.

[0381] 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 57 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.

[0382] 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.

[0383] 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.

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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).

[0390] 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).

[0391] 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.

[0392] 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.

[0393] (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.

[0394] 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.

[0395] 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.

[0396] 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.

[0397] 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.

[0398] 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.

[0399] 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.

[0400] 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.

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] 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.

[0406] 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.

[0407] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] 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".

[0412] 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.

[0413] 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.

[0414] 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.

[0415] 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.

[0416] 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.

[0417] 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.

[0418] 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).

[0419] 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).

[0420] 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).

[0421] 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).

[0422] 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.

[0423] 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.

[0424] 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).

[0425] 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.

[0426] 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.

[0427] 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.

[0428] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0429] 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.

[0430] 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.

[0431] 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.

[0432] 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.

[0433] Figure 58 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.

[0434] 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.

[0435] 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).

[0436] 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.

[0437] 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.

[0438] 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.).

[0439] 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.

[0440] 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.

[0441] 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).

[0442] 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.

[0443] 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).

[0444] 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.

[0445] 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.

[0446] 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.

[0447] 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.

[0448] 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.

[0449] 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).

[0450] 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."

[0451] 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.

[0452] 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.

[0453] 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).

[0454] 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.

[0455] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0456] 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.

[0457] 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.”

[0458] 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).

[0459] 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."

[0460] 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.

[0461] 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.

[0462] 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 upper-layer signaling to set a first demodulation reference signal (DMRS) setting type or a second DMRS setting type, and receives downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH), including antenna port indications. The system includes a control unit that controls the transmission of DMRS for PUSCH based on the association between the number of code division multiplexing (CDM) groups corresponding to the value of the antenna port indication and one or more DMRS ports, A terminal in which two CDM groups are available when the first DMRS configuration type is set, and three CDM groups are available when the second DMRS configuration type is set, and each of the CDM groups includes a first group subset corresponding to four existing DMRS ports and a second group subset corresponding to four extended DMRS ports.

2. The terminal according to claim 1, wherein the number of bits in the antenna port instruction is greater than the number of bits in the antenna port instruction when the upper layer signaling is not received.

3. The steps include receiving upper-layer signaling to set a first demodulation reference signal (DMRS) setting type or a second DMRS setting type, and receiving downlink control information (DCI) to schedule a physical uplink shared channel (PUSCH), including antenna port indications. The process includes the step of controlling the transmission of DMRS for the PUSCH based on the association between the number of code division multiplexing (CDM) groups corresponding to the value of the antenna port indication and one or more DMRS ports, A wireless communication method for a terminal, wherein two CDM groups are available when the first DMRS configuration type is set, and three CDM groups are available when the second DMRS configuration type is set, and each of the CDM groups includes a first group subset corresponding to four existing DMRS ports and a second group subset corresponding to four extended DMRS ports.

4. A transmitter unit that transmits upper-layer signaling to set a first demodulation reference signal (DMRS) setting type or a second DMRS setting type, and transmits downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH), including antenna port indication. The system includes a control unit that controls the reception of DMRS for the PUSCH based on the association between the number of code division multiplexing (CDM) groups corresponding to the value of the antenna port indication and one or more DMRS ports, A base station in which two CDM groups are available when the first DMRS configuration type is set, and three CDM groups are available when the second DMRS configuration type is set, and each of the CDM groups includes a first group subset corresponding to four existing DMRS ports and a second group subset corresponding to four extended DMRS ports.

5. A system having terminals and base stations, The aforementioned terminal is A receiving unit that receives upper-layer signaling to set a first demodulation reference signal (DMRS) setting type or a second DMRS setting type, and receives downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH), including antenna port indications. The system includes a control unit that controls the transmission of DMRS for PUSCH based on the association between the number of code division multiplexing (CDM) groups corresponding to the value of the antenna port indication and one or more DMRS ports, The aforementioned base station is It has a transmitting unit that transmits the above-level signaling and transmits the DCI, A system in which two CDM groups are available when the first DMRS configuration type is set, and three CDM groups are available when the second DMRS configuration type is set, and each of the CDM groups includes a first group subset corresponding to four existing DMRS ports and a second group subset corresponding to four extended DMRS ports.

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