Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives a setting of a first demodulation reference signal (DMRS) to which a frequency-domain orthogonal cover code (FD-OCC) longer than 2 is applied, and that receives a downlink control information format including an antenna port field; and a control unit that determines a combination corresponding to the value of the antenna port field on the basis of one of a first association in which a plurality of combinations of a plurality of ports including the port of the first DMRS and corresponding to a plurality of transmission / reception points are associated with a plurality of values of the antenna port field, and a second association in which a plurality of combinations of a plurality of ports including the port of the first DMRS and corresponding to a plurality of transmission / reception points are associated with a plurality of values of the antenna port field. The second association is to associate a plurality of combinations of a plurality of ports including the ports of the first DMRS and corresponding to one transmit / receive point with a plurality of values of the antenna port field.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. Background Art

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

[0003] Research is also being conducted on subsequent systems of LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In a future wireless communication system (e.g., NR), a method of introducing beam management is adopted. For example, in NR, research is underway to form (or utilize) beams in at least one of a base station and a user terminal (user equipment (UE)).

[0009] On the other hand, for orthogonalization of layers, etc., reference signals using multiple ports (e.g., Demodulation Reference Signal (DMRS)) are used. In future wireless communication systems, an increase in the number of DMRS ports compared to existing specifications is pursued. However, research on how to increase the number of DMRS ports has not progressed. There is a concern that communication throughput / communication quality may deteriorate when an appropriate number of DMRS ports cannot be used.

[0010] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that use an appropriate number of DMRS ports.

[0011] Means for Solving the Problems

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives a setting of a first Demodulation Reference Signal (DMRS) to which a Frequency-Domain Orthogonal Cover Code (FD-OCC) longer than 2 is applied, and receives a downlink control information format including an antenna port field; and a control unit that determines a combination corresponding to a value of the antenna port field based on one of a first association and a second association, the first association associating a plurality of combinations of a plurality of ports corresponding to a plurality of transmission / reception points including the port of the first DMRS with a plurality of values of the antenna port field, and the second association associating a plurality of combinations of a plurality of ports corresponding to one transmission / reception point including the port of the first DMRS with a plurality of values of the antenna port field.

[0013] Advantages of the Invention

[0014] According to one embodiment of the present disclosure, an appropriate number of DMRS ports can be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 An example of a DMRS port table for DMRS type 1 is shown.

[0016] Figure 2 An example of a DMRS port table for DMRS type 2 is shown.

[0017] Figure 3A and Figure 3B An example of an FD-OCC of length 4 is shown.

[0018] Figure 4 Shows an example of a DMRS port table for DMRS extension type 1.

[0019] Figure 5 Shows an example of a DMRS port table for DMRS extension type 2.

[0020] Figure 6 Shows an example of category 3 of DMRS port combinations.

[0021] Figure 7 Shows an example of category 1 of DMRS port combinations.

[0022] Figure 8 Shows an example of category 2 of DMRS port combinations.

[0023] Figure 9 Shows an example of a new antenna port table when using Rel.18 DMRS ports.

[0024] Figure 10 Shows an example of a DMRS port combination related to Embodiment #1.

[0025] Figure 11 Shows an example of a DMRS port combination related to Embodiment #2.

[0026] Figure 12 Is a diagram showing an example of the schematic structure of a wireless communication system related to one embodiment.

[0027] Figure 13 Is a diagram showing an example of the structure of a base station related to one embodiment.

[0028] Figure 14 Is a diagram showing an example of the structure of a user terminal related to one embodiment.

[0029] Figure 15 Is a diagram showing an example of the hardware structure of a base station and a user terminal related to one embodiment.

[0030] Figure 16 Is a diagram showing an example of a vehicle related to one embodiment. Detailed implementation

[0031] (Beam management)

[0032] In NR, a method of beam management is introduced. For example, in NR, forming (or using) beams in at least one of a base station and a UE is being studied.

[0033] It is expected that by applying beamforming (Beam Forming (BF)), the difficulty of ensuring coverage range associated with the increase in carrier frequency can be alleviated, and radio wave propagation loss can be reduced.

[0034] BF is a technology that forms a beam (antenna directivity) by controlling (also called precoding) the amplitude / phase of signals transmitted or received from each element, for example, by using a super multi-element antenna. In addition, Multiple Input Multiple Output (MIMO) using such a super multi-element antenna is also called massive MIMO.

[0035] It is also possible to control so as to scan the beam at both the transmitting and receiving sides, and select an appropriate group from candidates of transmission / reception beam pairs of multiple patterns. The pair of the transmit beam and the receive beam can also be called a beam pair, and can also be identified as a beam pair candidate index.

[0036] In addition, in beam management, instead of using a single beam, it is also possible to perform beam control at multiple levels such as a rough beam and a fine beam.

[0037] BF can be classified into digital BF and analog BF. Digital BF and analog BF can also be called digital precoding and analog precoding, respectively.

[0038] Digital BF is, for example, a method of performing precoding signal processing on the baseband (for digital signals). In this case, parallel processing such as Inverse Fast Fourier Transform (IFFT), Digital to Analog Converter (DAC), and Radio Frequency (RF) corresponding to the number of antenna ports (or RF chains) is required. On the other hand, at any timing, a number of beams corresponding to the number of RF chains can be formed.

[0039] Analog BF is, for example, a method of using a phase shifter on the RF. Although analog BF cannot form multiple beams at the same timing, since only the phase of the RF signal is rotated, the structure can be easily and inexpensively implemented.

[0040] In addition, a hybrid BF structure that combines digital BF and analog BF can also be implemented. The introduction of massive MIMO in NR is being studied, but if a large number of beamformings are performed only by digital BF, the circuit structure will become expensive, so the use of a hybrid BF structure is also envisioned.

[0041] (TCI, Spatial Relationship, QCL)

[0042] In NR, research is underway on controlling the reception processing (e.g., at least one of reception, demapping, demodulation, decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, encoding) of at least one of a signal and a channel (which may also be denoted as signal / channel; hereinafter, "A / B" can similarly be rewritten as at least one of A and B) in a UE based on the Transmission Configuration Indication state (TCI state).

[0043] The TCI state can also represent the state of the signal / channel applied to the downlink. A state corresponding to the TCI state of the signal / channel applied to the uplink can also be expressed as a spatial relation.

[0044] The TCI state refers to information related to the Quasi-Co-Location (QCL) of the signal / channel and can also be referred to as a spatial reception parameter, Spatial Relation Information (SRI), etc. The TCI state can also be set for the UE on a per-channel or per-signal basis.

[0045] QCL is an indicator representing the statistical properties of the signal / channel. For example, it can also mean that when a certain signal / channel is in a QCL relationship with other signal / channels, it can be assumed that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same among these different multiple signal / channels (at least one of them is QCL).

[0046] In addition, the spatial reception parameter can also correspond to the reception beam of the UE (e.g., reception analog beam), and the beam can also be determined based on spatial QCL. The QCL (or at least one element of QCL) in the present disclosure can also be rewritten as sQCL (spatial QCL).

[0047] The QCL can also be specified with multiple types (QCL types). For example, four QCL types A - D can also be set, and the parameters (or parameter sets) that can be assumed to be the same among these four QCL types A - D are different. Regarding this parameter (which can also be referred to as the QCL parameter), it is expressed as follows:

[0048] ■ QCL type A: Doppler shift, Doppler spread, average delay, and delay spread;

[0049] ■ QCL type B: Doppler shift and Doppler spread;

[0050] ■ QCL type C: Doppler shift and average delay;

[0051] ■ QCL type D: Spatial reception parameter.

[0052] Types A to C can also correspond to QCL information associated with synchronization processing related to at least one of time and frequency, and type D can also correspond to QCL information related to beam control.

[0053] The situation where the UE is also assumed to have a specific relationship of a particular control resource set (Control Resource Set (CORESET)), channel, or reference signal with other CORESETs, channels, or reference signals in a specific QCL (e.g., QCL type D) is also referred to as a QCL assumption.

[0054] The UE can also determine at least one of the transmission beam (Tx beam) and reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0055] The TCI state can also be, for example, information related to the QCL of the channel that is the object (or the reference signal (Reference Signal (RS)) used for this channel) with other signals (e.g., other downlink reference signals (Downlink Reference Signal (DL - RS))). The TCI state can also be set (indicated) by higher - layer signaling, physical - layer signaling, or a combination of them.

[0056] In this disclosure, the higher - layer signaling can also be, for example, any one of radio resource control (Radio Resource Control (RRC)) signaling, medium access control (Medium Access Control (MAC)) signaling, broadcast information, etc., or a combination of them.

[0057] MAC signaling can also use, for example, MAC control elements (MAC Control Element (MAC CE)), MAC protocol data units (Protocol Data Unit (PDU)), etc. Broadcast information can also be, for example, the Master Information Block (Master Information Block (MIB)), System Information Block (System Information Block (SIB)), minimum system information (Remaining Minimum System Information (RMSI)), other system information (Other System Information (OSI)), etc.

[0058] Physical layer signaling can also be, for example, downlink control information (Downlink Control Information (DCI)).

[0059] The channel(s) configured (specified) with the TCI state can also be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), downlink control channel (Physical Downlink Control Channel (PDCCH)), uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0060] In addition, the RS (DL-RS) that has a QCL relationship with this channel can also be, for example, at least one of the Synchronization Signal Block (Synchronization Signal Block (SSB)), Channel State Information Reference Signal (Channel State Information Reference Signal (CSI-RS)), and measurement reference signal (Sounding Reference Signal (SRS)). Alternatively, the DL-RS can also be the CSI-RS used for tracking (also referred to as the Tracking Reference Signal (TRS)) or the reference signal used for QCL detection (also referred to as QRS).

[0061] An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a broadcast channel (Physical Broadcast Channel (PBCH)). An SSB may also be referred to as an SS / PBCH block.

[0062] The information element of the TCI state (the "TCI-state IE" of RRC) set by higher layer signaling may also include one or more QCL information ("QCL-Info"). The QCL information may also include at least one of information related to DL-RS that is in a QCL relationship (DL-RS relationship information) and information indicating the QCL type (QCL type information). The DL-RS relationship information may also include information such as the index of the DL-RS (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 (Bandwidth Part (BWP)) where the RS is located.

[0063] (Multi-TRP)

[0064] In NR, one or more Transmission / Reception Points (TRPs) (multi-TRP) are being studied to perform DL transmission to a UE using one or more panels (multi-panel). In addition, the UE's UL transmission to one or more TRPs is being studied.

[0065] In addition, multiple TRPs may correspond to the same cell identifier (cell Identifier (ID)), may also correspond to different cell IDs, may also correspond to the positions / orders of different TCI states, may also correspond to different CORESET pools, and may also correspond to different SRS resource sets. The cell ID may be a physical cell ID (e.g., PCI) or a virtual cell ID.

[0066] In the case where only one TRP (TRP1) among the multi-TRP performs transmission to the UE (which may also be referred to as single mode, single TRP, etc.), TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

[0067] In the present disclosure, the single TRP mode may also mean a mode in which multi-TRP (mode) is not set.

[0068] In a case where only one of the multiple TRPs (TRP1 in this example) sends control signals to the UE and the multiple TRPs send data signals (which can also be referred to as the single master mode), the UE receives each PDSCH sent from the multiple TRPs based on one downlink control information (Downlink Control Information (DCI)).

[0069] In a case where each of the multiple TRPs sends separate control signals to the UE and the multiple TRPs send data signals (which can also be referred to as the multi-master mode), it is also possible that the first control signal (DCI) is sent in TRP1 and the second control signal (DCI) is sent in TRP2. The UE receives each PDSCH sent from the multiple TRPs based on these DCIs.

[0070] In the case of using one DCI to schedule multiple PDSCHs (which can also be referred to as multiple PDSCH (multiplePDSCH)) from multiple TRPs, this DCI can also be referred to as single DCI (S-DCI, single PDCCH). In addition, in the case of using multiple DCIs to separately schedule multiple PDSCHs from multiple TRPs, these multiple DCIs can also be referred to as multi DCI (M-DCI, multiple PDCCH (multiple PDCCH))

[0071] It is also possible to send respective different transport blocks (Transport Block (TB)) / code words (Code Word (CW)) / different layers from each TRP of the multiple TRPs. Alternatively, it is also possible to send the same TB / CW / layer from each TRP of the multiple TRPs.

[0072] As a method of transmission by multiple TRPs, non-coherent joint transmission (Non-Coherent JointTransmission (NCJT)) is being studied. In NCJT, for example, TRP1 performs modulation mapping on the first code word, performs layer mapping, and uses the first precoding for the first number of layers (for example, 2 layers) to send the first PDSCH. In addition, TRP2 performs modulation mapping on the second code word, performs layer mapping, and uses the second precoding for the second number of layers (for example, 2 layers) to send the second PDSCH.

[0073] In addition, multiple PDSCHs (multiple PDSCH) by NCJT can also be defined as partially or completely overlapping with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP can also overlap.

[0074] It can also be envisaged that these first PDSCHs and second PDSCHs are not in a Quasi-Co-Location (QCL) relationship (not quasi-co-located). The reception of multiple PDSCHs can also be rewritten as the simultaneous reception of PDSCHs of a non-QCL type (e.g., QCL type D).

[0075] It is being studied to support the repetition of PDSCHs (transport blocks (TBs) or codewords (CWs)) across multiple TRPs in URLLC for multiple TRPs. Ways of repetition across multiple TRPs in the frequency domain or layer (spatial) domain or time domain are being studied (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, 4). In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs for multiple TRPs can be either the same or different. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are sent within one time slot. In scheme 4, multiple PDSCHs from multiple TRPs are sent in different time slots.

[0076] According to such a multiple-TRP scenario, more flexible transmission control using a good-quality channel can be performed.

[0077] NCJT using multiple TRPs / panels has the potential to use a high rank. To support both ideal and non-ideal backhaul between multiple TRPs, both single DCI (single PDCCH) and multiple DCIs (multiple PDCCHs) can also be supported. For both single DCI and multiple DCIs, the maximum number of TRPs can also be 2.

[0078] For a single PDCCH design (mainly for ideal backhaul), an extension of TCI is being studied. Each TCI code point in the DCI can also correspond to one or two TCI states. The TCI field size can also be the same as the TCI field size in Rel.15.

[0079] For the PDCCH / CORESET defined in Rel.15, a TCI state without a CORESET pool index (CORESETPoolIndex) (which may also be referred to as TRP information (TRP Info)) can also be set for a CORESET.

[0080] For the enhancement of the PDCCH / CORESET defined in Rel.16, in multi-TRP based on multi-DCI, a CORESET pool index is set for each CORESET.

[0081] (Advances and beams of MIMO technology)

[0082] In addition, MIMO technology has been used in frequency bands below 6 GHz so far, but it is being studied to apply future MIMO technology to frequency bands above 6 GHz as well.

[0083] In addition, the frequency band below 7.125 GHz can also be referred to as Frequency Range (FR) 1, etc. The frequency band above 7.125 GHz / 24.250 GHz can also be referred to as FR2, FR2-1, FR2-2, millimeter Wave (mmW), FR4, etc.

[0084] It is assumed that the maximum number of MIMO layers is limited according to the antenna size.

[0085] Even for mmW, by using higher-order MIMO or coordinating multiple UEs, the degrees of freedom and diversity of MIMO multiplexing are improved, thus expecting an increase in throughput.

[0086] In this way, in future wireless communication systems (e.g., NR after Rel-17), it is assumed that even for high frequencies (e.g., FR2), only digital beams (which may also be called full digital operation) are used without using analog beams, or an operation mainly using digital beams is utilized.

[0087] In the case of full digital operation, for example, by simultaneously using orthogonal precoding (or orthogonal beams, digital beams) for multiple UEs, an improvement in frequency utilization efficiency can be expected. If digital beams are not properly used, the interference between UEs increases, resulting in a deterioration of communication quality (or a reduction in cell capacity). In addition, the orthogonal in the present disclosure can also be rewritten as quasi-orthogonal.

[0088] When the base station (which can also be rewritten as a Transmission / Reception Point (TRP), panel, etc.) can only transmit one beam at a certain time, the base station switches the beam for the UE and performs transmission and reception. When the base station can transmit multiple beams at a certain time, the base station can simultaneously use different beams to perform transmission and reception with multiple UEs.

[0089] Even if the base station is all-digital, as long as there are Rel.15 UEs, it should accommodate (support) Rel.15 UEs.

[0090] (DMRS)

[0091] Front-loaded DMRS is the initial (the first symbol or the first nearby symbol) DMRS for earlier demodulation. For high-speed moving UEs or high modulation and coding schemes (MCS) / ranks, additional DMRS can be configured via RRC. The frequency position of the additional DMRS is the same as that of the front-loaded DMRS.

[0092] For the time domain, DMRS mapping type A or B is configured. In DMRS mapping type A, the DMRS position l_0 is counted by the symbol index within the time slot. l_0 is configured by the parameter (dmrs-TypeA-Position) in the MIB or the ServingCellConfigCommon. The DMRS position 0 (reference point l) means the first symbol of the time slot or each frequency hopping. In DMRS mapping type B, the DMRS position l_0 is counted by the symbol index within the PDSCH / PUSCH. l_0 is always 0. The DMRS position 0 (reference point l) means the first symbol of the PDSCH / PUSCH or each frequency hopping.

[0093] The DMRS position is specified by the standard table and depends on the duration of the PDSCH / PUSCH. The position of the additional DMRS is fixed.

[0094] For the frequency domain, set the (PDSCH / PUSCH) DMRS set type 1 or 2. DMRS set type 1 has a comb structure and can be applied to both CP-OFDM (transport precoding = disabled) and DFT-S-OFDM (transport precoding = enabled). DMRS set type 1 maps the DMRS sequence to 1 subcarrier every 2 subcarriers in the frequency domain, so up to 2 DMRSs can be FDM. DMRS set type 2 can only be applied to CP-OFDM. DMRS set type 2 maps the DMRS sequence to 2 consecutive subcarriers every 6 subcarriers in the frequency domain, so up to 3 DMRSs can be FDM.

[0095] Set single-symbol DMRS or double-symbol DMRS.

[0096] Single-symbol DMRS is usually used (mandatory in Rel.15). In single-symbol DMRS, the number of appended DMRS (symbols) is {0, 1, 2, 3}. Single-symbol DMRS supports both the case where frequency hopping is valid and the case where it is invalid. If the maximum number (maxLength) in the uplink DMRS setting (DMRS-UplinkConfig) is not set, single-symbol DMRS is used.

[0097] Double-symbol DMRS is used for more DMRS ports (especially MU-MIMO). In double-symbol DMRS, the number of appended DMRS (symbols) is {0, 1}. Double-symbol DMRS supports the case where frequency hopping is invalid. If the maximum number (maxLength) in the uplink DMRS setting (DMRS-UplinkConfig) is 2 (len2), it is determined whether to use single-symbol DMRS or double-symbol DMRS through DCI or configured grant.

[0098] Based on the above, the possible setting patterns (patterns) of DMRS consider the following combinations.

[0099] ■ DMRS set type 1, DMRS mapping type A, single-symbol DMRS

[0100] ■ DMRS set type 1, DMRS mapping type A, double-symbol DMRS

[0101] ■ DMRS set type 1, DMRS mapping type B, single-symbol DMRS

[0102] ■ DMRS Setting Type 1, DMRS Mapping Type B, Dual-symbol DMRS

[0103] ■ DMRS Setting Type 2, DMRS Mapping Type A, Single-symbol DMRS

[0104] ■ DMRS Setting Type 2, DMRS Mapping Type A, Dual-symbol DMRS

[0105] ■ DMRS Setting Type 2, DMRS Mapping Type B, Single-symbol DMRS

[0106] ■ DMRS Setting Type 2, DMRS Mapping Type B, Dual-symbol DMRS

[0107] Multiple DMRS ports mapped to the same RE (resource of time and frequency) are referred to as a DMRS code division multiplexing (CDM) group.

[0108] For DMRS Setting Type 1 and single-symbol DMRS, 4 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed through an FD OCC of length 2. Between multiple DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed through FDM.

[0109] For DMRS Setting Type 1 and dual-symbol DMRS, 8 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed through an FD OCC of length 2, and 2 DMRS ports are multiplexed through a TD OCC. Between multiple DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed through FDM.

[0110] For DMRS Setting Type 2 and single-symbol DMRS, 6 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed through an FD OCC of length 2. Between multiple DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed through FDM.

[0111] For DMRS Setting Type 2 and dual-symbol DMRS, 12 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed through an FD OCC of length 2, and 2 DMRS ports are multiplexed through a TD OCC. Between multiple DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed through FDM.

[0112] An example of DMRS mapping type B is shown here, but the same applies to DMRS mapping type A.

[0113] Among the parameters for PDSCH DMRS (existing DMRS port table, Rel.15 DMRS port table, Figure 1 ), for DMRS setting type 1, DMRS ports 1000 - 1007 can be used, and for DMRS setting type 2, DMRS ports 1000 - 1011 can be used.

[0114] Among the parameters for PUSCH DMRS (existing DMRS port table, Rel.15 DMRS port table, Figure 2 ), for DMRS setting type 1, DMRS ports 0 - 7 can be used, and for DMRS setting type 2, DMRS ports 0 - 11 can be used.

[0115] (Port of reference signal)

[0116] For the orthogonality of MIMO layers, etc., reference signals using multiple ports (e.g., DeModulation Reference Signal (DMRS), CSI-RS) are used.

[0117] For example, for Single User MIMO (SU-MIMO), different DMRS ports / CSI-RS ports can also be set for each layer. For Multi User MIMO (MU-MIMO), different DMRS ports / CSI-RS ports can also be set for each layer within one UE and for each UE.

[0118] In addition, if the number of CSI-RS ports with a value larger than the number of layers used in the data is used, it is expected that more accurate channel state measurement can be performed based on this CSI-RS, contributing to the improvement of throughput.

[0119] In Rel.15 NR, for DMRS with multiple ports, by using Frequency Division Multiplexing (FDM), Frequency Domain Orthogonal Cover Code (FD-OCC), Time Domain OCC (TD-OCC), etc., for type 1 DMRS (in other words, DMRS setting type 1), a maximum of 8 ports are supported, and for type 2 DMRS (in other words, DMRS setting type 2), a maximum of 12 ports are supported.

[0120] In Rel.15 NR, as the above-mentioned FDM, a pattern of transmission frequencies in a comb shape (comb-shaped resource set) is used. As the above-mentioned FD-OCC, cyclic shift (CS) is used. In addition, the above-mentioned TD-OCC can only be applied to dual-symbol DMRS.

[0121] The OCC of the present disclosure can also be rewritten as an orthogonal code, orthogonalization, cyclic shift, etc.

[0122] In addition, the type of DMRS can also be referred to as the DMRS configuration type.

[0123] Among DMRS, the DMRS resource-mapped in units of two consecutive (adjacent) symbols can also be referred to as dual-symbol DMRS, and the DMRS resource-mapped in units of one symbol can also be referred to as single-symbol DMRS.

[0124] Each type of DMRS can be mapped to more than one symbol for one time slot according to the length of the data channel. The DMRS mapped to the start position of the data symbol can also be referred to as front-loaded DMRS, and the DMRS additionally mapped to other positions can also be referred to as additional DMRS.

[0125] In the case of DMRS configuration type 1 and single-symbol DMRS, Comb and CS can also be used for orthogonalization. For example, two types of Comb and two types of CS (Comb2+2CS) can be used to support up to 4 antenna ports (AP).

[0126] In the case of DMRS configuration type 1 and dual-symbol DMRS, Comb, CS, and TD-OCC can also be used for orthogonalization. For example, two types of Comb, two types of CS, and TD-OCC ({1,1} and {1, -1}) can be used to support up to 8 APs.

[0127] In the case of DMRS configuration type 2 and single-symbol DMRS, FD-OCC can also be used for orthogonalization. For example, an orthogonal code (2-FD-OCC) can be applied to two resource elements (RE) adjacent to each other in the frequency direction to support up to 6 APs.

[0128] In the case of DMRS configured type 2 and dual-symbol DMRS, FD-OCC and TD-OCC can also be used for orthogonalization. For example, orthogonal codes (2-FD-OCC) can also be applied to two adjacent REs in the frequency direction, and TD-OCC ({1, 1} and {1, -1}) can be applied to two adjacent REs in the time direction, thereby supporting up to 12 APs.

[0129] In addition, in Rel.15 NR, CSI-RS for multiple ports can also support up to 32 ports by using FDM, Time Division Multiplexing (TDM), frequency-domain OCC, time-domain OCC, etc. The same method as the above-mentioned DMRS can also be applied to the orthogonalization of CSI-RS.

[0130] In addition, the group of DMRS ports orthogonalized by FD-OCC / TD-OCC as described above can also be referred to as a Code Division Multiplexing (CDM) group.

[0131] Since different CDM groups are separated by FDM, they are orthogonal. On the other hand, within the same CDM group, due to channel variations, etc., the orthogonality of the applied OCC may sometimes deteriorate. In this case, if signals within the same CDM group are received with different received powers, there is a concern that the near-far problem may occur and orthogonality cannot be guaranteed.

[0132] Here, the TD-OCC / FD-OCC of DMRS in Rel.15 NR is described. The DMRS mapped to a Resource Element (RE) can also be equivalent to a sequence obtained by multiplying the DMRS sequence by the parameter of FD-OCC (which can also be referred to as a sequence element, etc.) w f (k’) and the parameter of TD-OCC (which can also be referred to as a sequence element, etc.) w t (l’).

[0133] Each of the TD-OCC and FD-OCC of DMRS in Rel.15 NR is equivalent to an OCC with a sequence length (which can also be referred to as OCC length) = 2. Therefore, the possible values of the above k’ and l’ are both 0 and 1. By multiplying this FD-OCC on a RE-by-RE basis, it is possible to multiplex the DMRS of two ports using the same time and frequency resources (2RE). If both this FD-OCC and TD-OCC are applied, it is possible to multiplex the DMRS of four ports using the same time and frequency resources (4RE).

[0134] The above two Rel.15 DMRS port tables for PDSCH (association of antenna port index (number) and parameters) correspond to DMRS setting types 1 and 2 respectively. Additionally, p represents the number of the antenna port, and Δ represents the parameter for shifting (offsetting) the frequency resource.

[0135] For example, for antenna ports 1000 and 1001, by applying {w f (0), w f (1)} = {+1, +1} and {w f (0), w f (1)} = {+1, -1} respectively, they are orthogonalized using FD-OCC.

[0136] For antenna ports 1000 - 1001 and antenna ports 1002 - 1003 (and further for antenna ports 1004 - 1005 in the case of type 2), by applying different values of Δ, FDM is applied. Thus, the antenna ports 1000 - 1003 (or 1000 - 1005) corresponding to single-symbol DMRS are orthogonalized using FD-OCC and FDM.

[0137] For type 1 antenna ports 1000 - 1003 and antenna ports 1004 - 1007, by applying {w t (0), w t (1)} = {+1, +1} and {w t (0), w t (1)} = {+1, -1} respectively, they are orthogonalized using TD-OCC. Thus, the antenna ports 1000 - 1007 (or 1000 - 1011) corresponding to double-symbol DMRS are orthogonalized using FD-OCC, TD-OCC, and FDM.

[0138] Only for CP-OFDM, the following are being studied: stipulating (without increasing the DMRS overhead) a larger number of orthogonal DMRS ports for DL / UL MU-MIMO, a design that is common between DL and UL DMRS, a maximum of 24 orthogonal DMRS ports, and for each applicable DMRS setting type, doubling the maximum number of orthogonal DMRS ports for both single-symbol DMRS and double-symbol DMRS.

[0139] In Rel.15, the following scenarios 1 to 4 can be set.

[0140] [Scenario 1] Single-symbol DMRS of DMRS setting type 1

[0141] The total number of DMRS ports is 2 (based on comb / FDM) × 2 (based on FD OCC) = 4 ports.

[0142] [Scenario 2] Dual-symbol DMRS of DMRS setting type 1

[0143] The total number of DMRS ports is 2 (based on comb / FDM) × 2 (based on FD OCC) × 2 (based on TD OCC) = 8 ports.

[0144] [Scenario 3] Single-symbol DMRS of DMRS setting type 2

[0145] The total number of DMRS ports is 3 (based on FDM) × 2 (based on FD OCC) = 6 ports.

[0146] [Scenario 4] Dual-symbol DMRS of DMRS setting type 2

[0147] The total number of DMRS ports is 3 (based on comb) × 2 (based on FD OCC) × 2 (based on TD OCC) = 12 ports.

[0148] In Rel. 18, it is being studied that for Scenarios 1, 2, 3, and 4, the total number of DMRS ports is increased to 2 times 8, 16, 12, and 24 respectively.

[0149] To increase the number of DMRS ports, the following 5 options (DMRS port number increase methods) are being studied.

[0150] <Option 1>

[0151] ■ Introduce a new OCC with a length greater than the existing OCC (e.g., 4 or 6).

[0152] In Option 1, as research items, the possibility of performance degradation in the case of large delay spread, the possibility of scheduling limitations, and backward compatibility, etc. are cited.

[0153] <Option 2>

[0154] ■ Utilization of TD-OCC on discontinuous multiple DMRS symbols (e.g., TD-OCC on front-loaded DMRS / additional DMRS).

[0155] In Option 2, as research items, the possibility of performance degradation in the case of high UE speed, the possibility of scheduling limitations (e.g., application method of frequency hopping), the possibility of DMRS setting being restricted (e.g., the number of additional DMRS being restricted), and backward compatibility, etc. are listed.

[0156] <Option 3>

[0157] ■ Increase the number of CDM groups (e.g., increase the number of comb / FDM).

[0158] In Option 3, as research items, the possibility of performance degradation and backward compatibility in cases where the delay spread is large are cited.

[0159] <Option 4>

[0160] ■ Reuse the symbols of additional DMRS and increase the number of orthogonal DMRS ports.

[0161] In Option 4, as research items, the possibility of performance degradation when the UE speed is high, the possibility of DMRS settings being restricted (e.g., the number of additional DMRS is restricted), and backward compatibility are cited.

[0162] <Option 5>

[0163] ■ Utilization of TD-OCC on discontinuous multiple DMRS symbols combined with FD-OCC / FDM (reuse the symbols of additional DMRS to improve channel estimation performance).

[0164] In Option 5, as research items, the possibility of performance degradation when the UE speed is high, the possibility of scheduling restrictions (e.g., the application method of frequency hopping), the possibility of DMRS settings being restricted (e.g., the number of additional DMRS is restricted), and backward compatibility are cited.

[0165] In Option 1, for the new FD-OCC for DMRS of PDSCH / PUSCH, for DMRS extension type 1, it can also follow at least one of the following several options.

[0166] <<Option 1-1>> Apply the new FD-OCC with a length of 6 to the 6RE of DMRS within one PRB in one CDM group.

[0167] <<Option 1-2>> In one CDM group, apply the new FD-OCC with a length of 4 to the 4RE of DMRS within one PRB or across consecutive multiple PRBs.

[0168] In Option 1, for the new FD-OCC for DMRS of PDSCH / PUSCH, for DMRS extension type 2, apply the new FD-OCC with a length of 4 to the 4RE of DMRS within one PRB in one CDM group. It can also support the new FD-OCC with a length of 6 for DMRS extension type 2.

[0169] In the present disclosure, it may also be the existing FD-OCC#0 = [+1 +1] and the existing FD-OCC#1 = [+1 -1].

[0170] The new FD-OCC may also be any one of the following several OCCs.

[0171] [OCC1-1]

[0172] An OCC of length 4 based on a 4-by-4 Walsh matrix (sequence). As Figure 3A in the example, for OCC index i = {0, 1, 2, 3}, 4 sequences are obtained.

[0173] [OCC1-2]

[0174] An OCC of length 4 based on cyclic shift. As Figure 3B in the example, for OCC index i = {0, 1, 2, 3}, by using cyclic shifts {i ■ 0, i ■ π / 2, i ■ π, i ■ 3π / 2}, 4 sequences are obtained.

[0175] In OCC1-1 and OCC1-2, each of the first half and the second half of the OCC#0, #1 (the OCCs corresponding to OCC indices 0, 1) of length 4 is the same as the OCC#0, #1 (the OCCs corresponding to OCC indices 0, 1) of length 2.

[0176] In the present disclosure, the OCC (FD-OCC / TD-OCC) corresponding to OCC index i may also be referred to as OCC#i.

[0177] A part of the multiple sequences of the new FD-OCC may also be associated with the Rel.15 DMRS port index.

[0178] In the case of using an FD-OCC of length 2, it is also possible to use the Rel.15 DMRS port table for DMRS setting type 1 and the Rel.15 DMRS port table for DMRS setting type 2.

[0179] Extended DMRS setting type 1 (DMRS extended type 1, DMRS extended type = 1, DMRS eType 1) uses the frequency-domain configuration of DMRS setting type 1 (DMRS type 1, DMRS type = 1, DMRS Type1) and the new FD-OCC. Extended DMRS setting type 2 (DMRS extended type 2, DMRS extended type = 2, DMRS eType 2) uses the frequency-domain configuration of DMRS setting type 2 (DMRS type 2, DMRS type = 2, DMRS Type 2) and the new FD-OCC.

[0180] In the present disclosure, DMRS setting type 1, DMRS type 1, DMRS type = 1, and DMRS Type 1 can also be rewritten with each other. In the present disclosure, DMRS setting type 2, DMRS type 2, DMRS type = 2, and DMRS Type 2 can also be rewritten with each other. In the present disclosure, extended DMRS setting type 1, DMRS extended type 1, DMRS extended type = 1, and DMRS eType 1 can also be rewritten with each other. In the present disclosure, extended DMRS setting type 2, DMRS extended type 2, DMRS extended type = 2, and DMRS eType 2 can also be rewritten with each other.

[0181] In the present disclosure, the maximum length of DMRS, maxLength, can also be rewritten with each other.

[0182] In the present disclosure, existing FD-OCC, FD-OCC with a length of 2, Rel.15 FD-OCC, w f (k′) can also be rewritten with each other. In each embodiment, new FD-OCC, FD-OCC longer than 2, Rel.18 FD-OCC, w f (k') can also be rewritten with each other.

[0183] The Rel.18 DMRS port table can also represent the DMRS port corresponding to the new FD-OCC (p is 0 or more). At least a part of the value of p in the Rel.18 DMRS port table can also overlap with the value of p in the Rel.15 DMRS port table. When it is set / indicated to use the new FD-OCC, the UE can also use the Rel.18 DMRS port table. When it is not set / indicated to use the new FD-OCC, the UE can also use the Rel.15 DMRS port table.

[0184] The Rel.18 DMRS port table for DMRS extended type 1 can also be Figure 4 the DMRS port table. As in this example, for the DMRS ports associated with the new FD-OCC #0, 1, the same DMRS port index (DMRS ports 0 to 7) as the Rel.15 DMRS port can also be used. For the DMRS ports associated with the new FD-OCC #2, 3, a DMRS port index different from the Rel.15 DMRS port (DMRS ports 8 to 15) can also be used.

[0185] The Rel.18 DMRS port table for DMRS extended type 2 can also be Figure 5DMRS port table. In this example, for the DMRS ports associated with new FD-OCC #0 and 1, the same DMRS port indices (DMRS ports 0 to 11) as those of Rel.15 DMRS ports can also be used. For the DMRS ports associated with new FD-OCC #2 and 3, different DMRS port indices (DMRS ports 12 to 23) from those of Rel.15 DMRS ports can also be used.

[0186] (MU-MIMO scheduling constraint)

[0187] For MU-MIMO, multiple DMRSs for multiple UEs are multiplexed. Multiple DMRSs can be CDM within one CDM group using different OCCs, and multiple DMRSs can be FDM among multiple CDM groups using different subcarriers (Combs). In CDM, problems (near-far problems) caused by differences in the distances from the base station to multiple UEs occur. In a flat fading environment, inter-symbol interference does not occur, but in a frequency-selective fading environment, inter-symbol interference occurs and the quality deteriorates. To prevent this, MU-MIMO scheduling constraints (existing MU-MIMO scheduling constraints) are defined.

[0188] For the PDSCH using DMRS setting type 1, the following MU-MIMO scheduling constraints are defined.

[0189] ■ In DMRS setting type 1, when a UE is scheduled with one codeword (CW), and in the existing antenna port table for DMRS setting type 1, in the case of the antenna port mapping assigned with the indices {2, 9, 10, 11, 30}, or when a UE is scheduled with 2 CWs, this UE can also be considered that the remaining orthogonal antenna ports are not associated with the transmission of the PDSCH to other UEs.

[0190] For the case of the number 1 of DMRS CDM groups not associated with data and rank 1 (one DMRS port), there may be no restrictions within the same CDM group either (for the DMRS port of this UE, one DMRS port of other UEs may also be CDM). For the case of the number 1 of DMRS CDM groups not associated with data and rank 2 (two DMRS ports), since all DMRS ports within the same CDM group are indicated, within the same CDM group, for the DMRS port of this UE, the DMRS ports of other UEs cannot be CDM. For the case of the number 2 of DMRS CDM groups not associated with data and rank 3 (three DMRS ports), since three of the four DMRS ports within two CDM groups are indicated, although one DMRS port is idle, one DMRS port of other UEs cannot be CDM. For the case of the number 2 of DMRS CDM groups not associated with data and rank 4 (four DMRS ports), since all DMRS ports within the same CDM group are indicated, within the same CDM group, for the DMRS port of this UE, the DMRS ports of other UEs cannot be CDM.

[0191] (Rel.18 DMRS port indication)

[0192] For the indication of Rel.18 DMRS for PDSCH, several methods below are being studied.

[0193] [Method A]

[0194] Specify a new antenna port table similar to the existing antenna port table. The maximum size of the antenna port field is increased by M (M >= 0) bits. When M >= 1, a part or all of the existing rows in the existing antenna port table except for the reserved rows can also be copied to the new antenna port table.

[0195] [Method B]

[0196] Reuse the existing antenna port table. Maintain the size of the antenna port field in the DCI. Import a new DCI field for the DMRS port offset indicator that indicates M (M >= 1) bits for the Rel. 18 DMRS port. Support for at least M = 1 is also possible. In M = 1, when the DMRS port offset indicator field is set to 0, the DMRS port can also be the same as the DMRS port indicated by the antenna port field in DCI format 1_1 / 1_2. In M = 1, when the DMRS port offset indicator field is set to 1, the DMRS port can also be the DMRS port that is the DMRS port indicated by the antenna port field in DCI format 1_1 / 1_2 plus X. For DMRS extension type 1, X can also be 8. For DMRS extension type 2, X can also be 12.

[0197] [Mode C]

[0198] Reuse the existing antenna port table. Maintain the size of the antenna port field in the DCI. Import a new table for the Rel. 18 DMRS port that indicates an 8 / 16-port or 12 / 24-port. The set time domain resource allocation (TDRA) item can also include an indication of which DMRS port is used for scheduling.

[0199] [Mode D]

[0200] Reuse the existing antenna port table. Maintain the size of the antenna port field in the DCI. Import a new table for the Rel. 18 DMRS port that indicates the Rel. 18 DMRS port associated with the Rel. 18 DMRS port index. At least one DMRS port associated with the Rel. 18 DMRS port index p can also be included in each row.

[0201] (DMRS port combination)

[0202] In the antenna port indication of the DMRS ports of DMRS maximum length = 1 / 2 extension type 1 / extension type 2 for PDSCH, research is being conducted on indicating all of the following several categories of port combinations.

[0203] (Category 1) Combinations of multiple indices of existing ports (for extension type 1, p = 0 to 7; for extension type 2, p = 0 to 11).

[0204] (Category 2) Combinations of multiple indices of new ports (for extension type 1, p = 8 to 15; for extension type 2, p = 12 to 23).

[0205] (Category 3) Combinations of existing port indices and new port indices within at least one CDM group with DMRS maximum length = 1 (for extension type 1, combinations of at least one of the maximum 4 ports starting from p = {0, 1, 8, 9} and the maximum 4 ports starting from p = {2, 3, 10, 11}; for extension type 2, combinations of at least one of the maximum 4 ports starting from p = {0, 1, 12, 13} and the maximum 4 ports starting from p = {2, 3, 14, 15}). For a maximum of 4 ranks, only one CDM group is used. For ranks greater than 4, more than one CDM group can be used.

[0206] The DMRS ports for PDSCH are determined by p + 1000.

[0207] Research is underway to support DMRS maximum length = 1 and ranks = 5, 6, 7, 8 in the DMRS ports of extension type 1 / extension type 2 for PDSCH / PUSCH.

[0208] Figure 6 Shows an example of category 3 for extension type 1 DMRS and rank 8. When using category 3, DMRS maximum length = 1 can be used. Figure 7 Shows an example of category 1 for extension type 1 DMRS and rank 8. Figure 8 Shows an example of category 2 for extension type 1 DMRS and rank 8. When using category 1 or 2, DMRS maximum length = 2 is required, the DMRS overhead increases, the MU-MIMO operation becomes complex, or DMRS ports are consumed.

[0209] In the above-mentioned MU-MIMO scheduling constraints, for ranks greater than 4 (2 CWs), MU-MIMO is not possible. This means that if category 3 is not allowed, the user capacity of MU-MIMO cannot be increased.

[0210] In addition, the antenna port indication / DMRS port combination for multiple TRPs is not clear.

[0211] In such a situation where the operation is not clear, there is a concern that the communication throughput / communication quality may deteriorate.

[0212] Therefore, the inventors of the present invention came up with the operation of indicating / determining the DMRS port combination.

[0213] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. In addition, the following embodiments (for example, each case) can be used separately or in combination of at least two.

[0214] In the present disclosure, "A / B" and "at least one of A and B" can also be rewritten with each other. Further, in the present disclosure, "A / B / C" can also mean "at least one of A, B, and C".

[0215] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. can also be rewritten with each other. In the present disclosure, support, control, be able to control, operate, be able to operate, etc. can also be rewritten with each other.

[0216] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, Information Element (IE), configuration, etc. can also be rewritten with each other. In the present disclosure, Medium Access Control control element (MAC Control Element (CE)), update command, activation / deactivation command, etc. can also be rewritten with each other.

[0217] In the present disclosure, the higher layer signaling can also be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0218] In the present disclosure, for example, the MAC signaling can also use a MAC Control Element (MACCE), a MAC Protocol Data Unit (PDU), etc. The broadcast information can also be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0219] In the present disclosure, the physical layer signaling can also be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.

[0220] In the present disclosure, an index, an identifier (Identifier (ID)), an indicator, a resource ID, etc. may also be rewritten with each other. In the present disclosure, a sequence, a list, a set, a group, a cluster, a subset, etc. may also be rewritten with each other.

[0221] In the present disclosure, a panel, a panel group, a beam, a beam group, a precoder, an Uplink (UL) transmission entity, a Transmission / Reception Point (TRP), a base station, a Spatial Relation Information (SRI), a spatial relation, an SRS Resource Indicator (SRI), a Control Resource SET (CORESET), a Physical Downlink Shared Channel (PDSCH), a Codeword (CW), a Transport Block (TB), a Reference Signal (RS), an antenna port (e.g., a Demodulation Reference Signal (DMRS) port), an antenna port group (e.g., a DMRS port group), a group (e.g., a spatial relation group, a Code Division Multiplexing (CDM) group, a reference signal group, a CORESET group, a Physical Uplink Control Channel (PUCCH) group, a PUCCH resource group), a resource (e.g., a reference signal resource, an SRS resource), a resource set (e.g., a reference signal resource set), a CORESET pool, a Transmission Configuration Indication state (TCI state) of the downlink (DL TCI state), a TCI state of the uplink (UL TCI state), a unified TCI state, a common TCI state, a Quasi-Co-Location (QCL), a QCL assumption, etc. may also be rewritten with each other.

[0222] In the present disclosure, "having the ability to..." may also be rewritten with "supporting / reporting the ability to...".

[0223] In the present disclosure, a DMRS port, an antenna port, a port, a port number, a port index may also be rewritten with each other.

[0224] In the present disclosure, RB and PRB can also be rewritten with each other.

[0225] In the present disclosure, OCC#i and the OCC corresponding to the OCC index i can also be rewritten with each other. In the present disclosure, the existing FD-OCC, the FD-OCC with a length of 2, w f (k') can also be rewritten with each other. In each embodiment, the new FD-OCC, the FD-OCC longer than 2, w f (k') can also be rewritten with each other.

[0226] In the present disclosure, the existing ports can also be ports 0 to 7 in DMRS extension type 1 and ports 0 to 11 in DMRS extension type 2. In each embodiment, the new ports can also be ports 8 to 15 in DMRS extension type 1 and ports 12 to 23 in DMRS extension type 2.

[0227] In the present disclosure, the association of the DMRS port table, DMRS ports, and parameters can also be rewritten with each other. The parameter can also include at least one of the CDM group, Δ, FD OCC, and TD OCC.

[0228] In the present disclosure, the association of the antenna port indication table, antenna port table, the value of the antenna port field, and parameters can also be rewritten with each other. The parameter can also include at least one of the number of DMRS CDM groups without accompanying data, the DMRS port (number / index), and the number of preamble DMRS symbols.

[0229] In the present disclosure, the TRP, transmission point, panel, DMRS port group, CORESET pool, and one of the two TCI states associated with one code point of the TCI field can also be rewritten with each other.

[0230] In the present disclosure, the transmission / reception of a channel / signal using a single TRP can also be rewritten as follows: In the transmission / reception of the channel / signal (e.g., NCJT / CJT / repetition), the TCI states (joint / independent / indicated TCI state) are equal, or, in the transmission / reception of the channel / signal (e.g., NCJT / CJT / repetition), the number of TCI states (joint / independent / indicated TCI state) is one.

[0231] The transmission / reception of a channel / signal using a single TRP can also be rewritten as follows: In the transmission / reception of this channel / signal (e.g., NCJT / CJT / repetition), the TCI states (joint / independent / indicated TCI states) are different, or, in the transmission / reception of this channel / signal (e.g., NCJT / CJT / repetition), the number of different TCI states (joint / independent / indicated TCI states) is multiple (e.g., 2).

[0232] In this disclosure, single (one) TRP, single TRP system, single TRP transmission, and single PDSCH can also be rewritten with each other. In this disclosure, multiple TRPs, multiple TRP systems, multiple TRP transmissions, and multiple PDSCHs can also be rewritten with each other.

[0233] In this disclosure, single DCI, single PDCCH, multiple TRPs based on single DCI, 2 TCI states are activated on at least one TCI code point, at least one code point of the TCI field is mapped to 2 TCI states, and a specific index (e.g., TRP index, CORESET pool index, or index corresponding to the TRP) is set for a specific channel / CORESET can also be rewritten with each other.

[0234] In this disclosure, single TRP, a channel / signal using a single TRP, a channel using one TCI state / spatial relation, multiple TRPs not activated by RRC / DCI, multiple TCI states / spatial relations not activated by RRC / DCI, a CORESET pool index (CORESETPoolIndex) value of 1 is not set for any CORESET and any code point of the TCI field is not mapped to 2 TCI states can also be rewritten with each other.

[0235] In this disclosure, multiple TRPs, a channel / signal using multiple TRPs, a channel using multiple TCI states / spatial relations, multiple TRPs activated by RRC / DCI, multiple TCI states / spatial relations activated by RRC / DCI, at least one of multiple TRPs based on single DCI and multiple TRPs based on multiple DCIs can also be rewritten with each other.

[0236] In this disclosure, multiple TRPs based on multiple DCIs, a CORESET pool index (CORESETPoolIndex) value of 1 is set for the CORESET, and multiple specific indexes (e.g., TRP index, CORESET pool index, or index corresponding to the TRP) are set for a specific channel / CORESET can also be rewritten with each other.

[0237] In the present disclosure, TRP#1 (the first TRP) can correspond to either a CORESET pool index = 0 or the first TCI state among two TCI states corresponding to a code point of the TCI field. TRP#2 (the second TRP) can correspond to either a CORESET pool index = 1 or the second TCI state among two TCI states corresponding to a code point of the TCI field.

[0238] In the present disclosure, a single DCI (sDCI), a single PDCCH, a multi-TRP system based on a single DCI, an MTRP based on sDCI, and two TCI states on at least one activated TCI code point can also be rewritten with each other.

[0239] In the present disclosure, a multi DCI (mDCI), a multi PDCCH, a multi-TRP system based on a multi DCI, an MTRP based on mDCI, and two CORESET pool indexes being set or a CORESET pool index = 1 (or a value of 1 or more) can also be rewritten with each other.

[0240] In the present disclosure, a beam indication DCI, a beam indication MAC CE, and a beam indication DCI / MAC CE can also be rewritten with each other. In other words, an indication related to the indicated TCI state for a UE can also be performed using at least one of a DCI and a MAC CE.

[0241] In the present disclosure, a channel, a signal, and a channel / signal can also be rewritten with each other. In the present disclosure, a DL channel, a DL signal, a DL signal / channel, transmission / reception of a DL signal / channel, DL reception, and DL transmission can also be rewritten with each other. In the present disclosure, a UL channel, a UL signal, a UL signal / channel, transmission / reception of a UL signal / channel, UL reception, and UL transmission can also be rewritten with each other.

[0242] In the present disclosure, applying a TCI state / QCL assumption to each channel / signal / resource can also mean applying a TCI state / QCL assumption to the transmission and reception of each channel / signal / resource.

[0243] In the present disclosure, the first TCI state (the first indicated TCI state) can also correspond to the first TRP. In the present disclosure, the second TCI state (the second indicated TCI state) can also correspond to the second TRP. In the present disclosure, the nth TCI state (the nth indicated TCI state) can also correspond to the nth TRP.

[0244] In the present disclosure, the value of the first CORESET pool index (e.g., 0), the value of the first TRP index (e.g., 1), and the first TCI state (the first DL / UL (combined / independent) TCI state) may also correspond to each other. In the present disclosure, the value of the second CORESET pool index (e.g., 1), the value of the second TRP index (e.g., 2), and the second TCI state (the second DL / UL (combined / independent) TCI state) may also correspond to each other.

[0245] (Wireless communication method)

[0246] In each embodiment, the set Rel.18 DMRS ports and the set DMRS extension types 1 / 2 may also be rewritten with each other.

[0247] In the antenna port table of each embodiment, the antenna port field value, the number of DMRS CDM groups without data, and the value of the DMRS port are an example, and other values may also be specified.

[0248] In the new antenna port table in the case of using Rel.18 DMRS ports, a part or all of the DMRS port combinations in the existing antenna port table may also be reused. In this case, it may also be that for DMRS extension type 1, only the DMRS ports among DMRS ports 0 to 7 are indicated, and for DMRS extension type 2, only the DMRS ports among DMRS ports 0 to 11 are indicated. To avoid DMRS overhead or complex MU-MIMO multiplexing, as Figure 9 In the example of, at most 3 or 4 DMRS ports within the same CDM group may also be indicated. For example, for DMRS extension type 1, ports #0, #1, #8, #9 may also be indicated.

[0249] In each embodiment, for the application of multiple TCI states in transmission and reception using multiple TRPs, the method mainly for two TRPs (i.e., the case where at least one of N and M is 2) is described, but the number of TRPs may also be 3 or more (multiple), and each embodiment may also be applied to correspond to the number of TRPs. In other words, at least one of N and M may also be a number greater than 2.

[0250] Each embodiment may be applied to the DMRS of PDSCH and may also be applied to the DMRS of PUSCH. The PUSCH DMRS port index may also be represented as p, and the PDSCH DMRS port index may also be represented as p + 1000.

[0251] Each embodiment may be applied to single-symbol DMRS and may also be applied to double-symbol DMRS. The following embodiments may be applied to DMRS setting type 1 and may also be applied to DMRS setting type 2.

[0252] Each embodiment can be applied to both DMRS extended type 1 and DMRS extended type 2. Each embodiment can be applied to both DMRS maximum length = 1 and DMRS maximum length = 2.

[0253] In each embodiment, for MU-MIMO scheduling constraints, idle (remaining) orthogonal DMRS ports are not used for other UEs and can be rewritten with each other.

[0254] <Embodiment #1>

[0255] This embodiment relates to MU-MIMO scheduling constraints for Rel.18 DMRS ports.

[0256] When a UE is configured with Rel.18 DMRS ports, the UE can also comply with at least one of the following several constraints.

[0257] - Constraint 1

[0258] Apply existing MU-MIMO scheduling constraints. This means that a large number of DMRS ports are not used for other UEs. For example, when a DMRS port combination of class 1 / 2 is used for ranks greater than 4 and 2 CWs, the idle ports are not used for other UEs.

[0259] - Constraint 2

[0260] Update MU-MIMO scheduling constraints. The UE can also comply with at least one of the following several constraints.

[0261] -- Constraint 2-1

[0262] There are no existing MU-MIMO scheduling constraints. There may also be no MU-MIMO scheduling constraints for Rel.18 DMRS ports.

[0263] -- Constraint 2-2

[0264] Introduce several new MU-MIMO scheduling constraints.

[0265] -- Constraint 2-3

[0266] There are no MU-MIMO scheduling constraints across different CDM groups. Introduce new MU-MIMO scheduling constraints within one CDM group.

[0267] It can also be that the MU-MIMO scheduling constraints in Constraint 1 are, for example, as Figure 10 In extended type 2, when a DMRS port combination using two CDM groups #0 and #1 is indicated, the DMRS ports in other CDM group #2 cannot be applied to other UEs.

[0268] Alternatively, like the example of the MU-MIMO scheduling constraint in 2-3, in the extended type 2, when the DMRS port combination using two CDM groups #0 and #1 is indicated, the DMRS ports within the other CDM group #2 can be allocated to other UEs. Figure 10 The figure shows the case of rank = 8, extended type 2, and DMRS maximum length = 2, but the above at least one constraint does not necessarily apply to this case. It can be applied to at least one of rank = 1 to 8, can also be applied to at least one of 1CW and 2CW, can also be applied to at least one of extended type 1 and 2, and can also be applied to at least one of DMRS maximum length = 1 and 2.

[0269] According to this embodiment, the UE can be indicated an appropriate DMRS port combination for Rel.18 DMRS.

[0270] <Embodiment #2>

[0272] This embodiment relates to the DMRS port combination of category 3.

[0273] According to the DMRS port combination of category 3, by not using the dual-symbol DMRS, the DMRS overhead can be suppressed and the UE throughput can be improved. The DMRS port combination of category 3 can also be specified only for the case of DMRS maximum length = 1. The DMRS port combination of category 3 can also be specified only for the case of DMRS maximum length = 2 and the number of preamble DMRS symbols = 1.

[0274] The DMRS port combination of category 3 can also be specified for the case of DMRS maximum length = 2 and the number of preamble DMRS symbols = 2. Like the example of Figure 11

[0275] the DMRS ports corresponding to the TD-OCC index #0 can be allocated to one UE, and the DMRS ports corresponding to the TD-OCC index #1 can be allocated to other UEs. In this case, MU-MIMO can be performed and the system capacity can be improved.

[0276] When the existing MU-MIMO scheduling constraint is applied to the Rel.18 DMRS ports (the case where MU-MIMO cannot be performed), for the PDSCH, the DMRS port combination of category 3 may not be indicated (may not be included in the antenna port table) in the case of DMRS maximum length = 2 and the number of preamble DMRS symbols = 2.

[0277] ​In the existing specifications, the existing MU-MIMO scheduling constraints are only applied to PDSCH. In the existing specifications, there are no MU-MIMO scheduling constraints for PUSCH. For PUSCH, when the maximum length of DMRS = 2 and the number of preamble DMRS symbols = 2, a DMRS port combination of category 3 can also be indicated (which can also be included in the antenna port table).

[0277] According to this embodiment, the UE can be indicated an appropriate DMRS port combination for Rel.18 DMRS.

[0278] <Embodiment #3>

[0279] This embodiment relates to DMRS ports for multiple TRPs.

[0280] The UE can also refer to different antenna port tables (DMRS port combinations, DMRS port tables) between the case of being configured with multiple TRPs and the case of not being configured with multiple TRPs (being configured with a single TRP). The different antenna port tables can also be different in only some items.

[0281] The DMRS port combinations for rank 3 or 4 in the case of not being configured with multiple TRPs can also be only DMRS port combinations of category 3. For example, the DMRS port combinations for extended type 1 can also include at least one of the DMRS port combinations {0, 1, 8}, {0, 1, 8, 9}, {2, 3, 10}, {2, 3, 10, 11}. For example, the DMRS port combinations for extended type 2 can also include at least one of the DMRS port combinations {0, 1, 12}, {0, 1, 12, 13}, {2, 3, 14}, {2, 3, 14, 15}. The DMRS port combinations for rank 3 or 4 in the case of not being configured with multiple TRPs can also include at least one of the DMRS port combinations of category 1 and category 2. In this case, there are restrictions on at least one of the DMRS port combinations of category 1 and category 2.

[0282] For the case of multiple TRPs configured, the DMRS port combinations for rank 3 or 4 can also be only category 3 DMRS port combinations. For the case of multiple TRPs configured, the DMRS port combinations for rank 3 or 4 can be either only DMRS port combinations across multiple CDM groups or can include DMRS port combinations across multiple CDM groups. For example, the DMRS port combination for extended type 1 can also include at least one of the DMRS port combinations {0, 1, 2} and {0, 1, 2, 3}. For the case of multiple TRPs configured, the DMRS port combinations for rank 3 or 4 can be either only DMRS port combinations across multiple CDM groups of category 3 or can include DMRS port combinations across multiple CDM groups of category 3. By allocating different multiple CDM groups to different multiple TRPs, it is possible to prevent degradation of characteristics due to interference.

[0283] Depending on whether multiple TRPs are configured, the antenna port table for PDSCH can also be different. Additionally, depending on whether multiple TRPs are configured, either the antenna port table for PUSCH can be different or both the antenna port table for PDSCH and the antenna port table for PUSCH can be different.

[0284] Depending on whether multiple TRPs are configured, either the number of rows (items, antenna port field values) of the antenna port table can be different or the size of the antenna port field can be different. For example, the number of rows of the antenna port table / the number of bits of the antenna port field in the case of multiple TRPs configured can also be more than the number of rows of the antenna port table / the number of bits of the antenna port field in the case of not configuring multiple TRPs (configuring a single TRP).

[0285] The combination of DMRS port 0 and 2 with the number of DMRS CDM groups of extended type 1 and no data = 1 can be included in the antenna port table for the case of multiple TRPs configured and can also be included in the antenna port table for the case of not configuring multiple TRPs (configuring a single TRP). This DMRS port combination is not reused for other UEs and actually does not use FD - OCC (applying FD - OCC [0 00 0]), so even with strong frequency selectivity, it is possible to prevent degradation of characteristics, thus being effective for a single TRP as well.

[0286] According to this embodiment, the UE can be instructed with an appropriate DMRS port combination for Rel.18 DMRS for multi - TRP / single - TRP.

[0287] <Supplement>

[0288] [Notification of Information to UE]

[0289] Notification of any information from the (Network (NW) (e.g., from a Base Station (BS))) to the UE in the above-described embodiments (in other words, reception of any information from the BS in the UE) can also be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signals), or a combination thereof.

[0290] In the case where the above notification is performed via a MAC CE, the MAC CE can also be identified by being included in the MAC sub-header with a new Logical Channel ID (LCID) not specified in the existing specifications.

[0291] In the case where the above notification is performed via DCI, the above notification can also be performed via a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in the scrambling of the Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0292] Furthermore, notification of any information to the UE in the above-described embodiments can also be performed periodically, semi-persistently, or aperiodically.

[0293] [Notification of Information from the UE]

[0294] Notification of any information from the UE (to the NW) in the above-described embodiments (in other words, transmission / reporting of any information from the UE to the BS) can also be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0295] In the case where the above notification is performed via a MAC CE, the MAC CE can also be identified by being included in the MAC sub-header with a new LCID not specified in the existing specifications.

[0296] In the case where the above notification is performed via UCI, the above notification can also be sent using PUCCH or PUSCH.

[0297] Furthermore, notification of any information from the UE in the above-described embodiments can also be performed periodically, semi-persistently, or aperiodically.

[0298] [Application of Each Embodiment]

[0299] At least one of the above-described embodiments may also be applied under specific conditions. The specific conditions may be specified in the specification or may be notified to the UE / BS using higher-layer signaling / physical-layer signaling.

[0300] At least one of the above-described embodiments may also be applied only to a UE that has reported a specific UE capability or supports the specific UE capability.

[0301] The specific UE capability may also represent at least one of the following:

[0302] ■ Support for specific processing / operations / control / information for at least one of the above-described embodiments.

[0303] ■ For PDSCH / PUSCH, support for more DMRS ports than the existing specification.

[0304] ■ For DMRS of PDSCH / PUSCH, using TD-OCC / FD-OCC / FDM, support for more DMRS ports than the existing specification.

[0305] ■ Support for FD OCC with a length of 4 / 6.

[0306] In addition, the above specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or a capability for each feature set (Feature Set (FS)) or each feature set per component carrier (Feature Set PerComponent-carrier (FSPC)).

[0307] In addition, the above specific UE capability may be a capability that is applied across all full-duplex modes (commonly regardless of the duplex mode), or a capability for each duplex mode (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0308] In addition, at least one of the above-described embodiments can also be applied when the UE is set / activated / triggers specific information associated with the above-described embodiments (or performs operations of the above-described embodiments) through higher layer signaling / physical layer signaling. For example, the specific information can also be information indicating activation of the functions of each embodiment, any RRC parameters for a specific version (e.g., Rel.18 / 19), etc.

[0309] When the UE does not support at least one of the above specific UE capabilities or is not set with the above specific information, it can also apply operations such as Rel.15 / 16.

[0310] (Supplementary Note)

[0311] Regarding an embodiment of the present disclosure, the following inventions are noted.

[0312] [Supplementary Note 1]

[0313] A terminal having:

[0314] a receiving unit that receives a setting of a first demodulation reference signal (DMRS) to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and receives a downlink control information format including an antenna port field; and

[0315] a control unit that determines a combination corresponding to a value of the antenna port field based on an association between a plurality of combinations of a plurality of ports including the port of the first DMRS and a plurality of values of the antenna port field.

[0316] [Supplementary Note 2]

[0317] The terminal according to Supplementary Note 1, wherein

[0318] For the first DMRS, a restriction on the association of the second DMRS port with other terminals is not applied, and the second DMRS is applied with an FD-OCC having a length of 2.

[0319] [Supplementary Note 3]

[0320] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein

[0321] For the first DMRS, a restriction different from the restriction on the association of the second DMRS port with other terminals is applied, and the second DMRS is applied with an FD-OCC having a length of 2.

[0322] [Supplementary Note 4]

[0323] The terminal according to any one of Supplementary Notes 1 to 3, wherein

[0324] When the maximum number of symbols of the first DMRS is 2 and the number of preamble DMRS symbols is 2, the combination includes the port of the first DMRS and the port of the second DMRS to which FD-OCC with a length of 2 is applied.

[0325] (Supplementary Note)

[0326] Regarding an embodiment of the present disclosure, the following invention is noted.

[0327] [Supplementary Note 1]

[0328] A terminal having:

[0329] a receiving unit that receives a setting of a first demodulation reference signal (DMRS) to which a frequency-domain orthogonal cover code (FD-OCC) longer than 2 is applied, and receives a downlink control information format including an antenna port field; and

[0330] a control unit that determines a combination corresponding to the value of the antenna port field based on one of a first association and a second association, the first association associating a plurality of combinations of a plurality of ports including the port of the first DMRS and corresponding to a plurality of transmit-receive points with a plurality of values of the antenna port field, and the second association associating a plurality of combinations of a plurality of ports including the port of the first DMRS and corresponding to one transmit-receive point with a plurality of values of the antenna port field.

[0331] [Supplementary Note 2]

[0332] The terminal according to Supplementary Note 1, wherein

[0333] the control unit uses the first association when the plurality of transmit-receive points are set, and uses the second association when the plurality of transmit-receive points are not set.

[0334] [Supplementary Note 3]

[0335] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein

[0336] at least one of the first association and the second association includes a combination of 3 or 4 ports, and the combination of ports includes the port of the first DMRS and the port of the second DMRS to which FD-OCC with a length of 2 is applied.

[0337] [Supplementary Note 4]

[0338] The terminal according to any one of Supplementary Notes 1 to 3, wherein

[0339] the first association includes a combination of a plurality of ports across a plurality of code division multiplexing (CDM) groups.

[0340] (Wireless Communication System)

[0341] Hereinafter, the structure of the wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one or a combination of the above-described wireless communication methods according to the respective embodiments of the present disclosure is used for communication.

[0342] Figure 12 FIG. is an example showing a schematic configuration of the wireless communication system according to an embodiment. The wireless communication system 1 (which may also be simply referred to as the system 1) may be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0343] In addition, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). 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 the like.

[0344] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0345] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0346] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0347] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0348] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also 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 higher than 24 GHz (above - 24 GHz). In addition, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0349] In addition, the user terminal 20 may also communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0350] The multiple base stations 10 may also be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 that serves as the upper - level station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 that serves as a relay station (relay) may also be referred to as an IAB node.

[0351] The base station 10 can also be connected to the core network 30 via other base stations 10 or directly. For example, the core network 30 can also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0352] For example, the core network 30 can also include network functions (NFs) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and an Operation, Administration and Maintenance (Management) (OAM). Additionally, multiple functions can be provided by one network node. Furthermore, communication with an external network (e.g., the network) can also be performed via the DN.

[0353] The user terminal 20 can also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0354] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the Downlink (DL) and the Uplink (UL), 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. can also be used.

[0355] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, in the wireless access methods of the UL and the DL, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) can also be used.

[0356] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. that are shared among the respective user terminals 20 can also be used.

[0357] Furthermore, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. that are shared among the respective user terminals 20 can also be used.

[0358] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can also be transmitted through the PBCH.

[0359] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of the PDSCH and the PUSCH.

[0360] In addition, the DCI for scheduling the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be rewritten as DL data, and the PUSCH can also be rewritten as UL data.

[0361] In the detection of the PDCCH, the Control Resource SET (CORESET) and the search space can also be used. The CORESET corresponds to the resource for searching for the DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0362] One search space can also correspond to PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure can also be rewritten with each other.

[0363] Through the PUCCH, it is also possible to transmit uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., which can also be referred to as Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)). Through the PRACH, it is also possible to transmit a random access preamble for establishing a connection with a cell.

[0364] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without the word "link". Furthermore, it can also be expressed without the word "Physical" at the beginning of various channels.

[0365] In the wireless communication system 1, it is also possible to transmit a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. As the DL-RS, in the wireless communication system 1, it is also possible to transmit a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc.

[0366] The synchronization signal can, for example, also be at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. can also be referred to as reference signals.

[0367] In addition, in the wireless communication system 1, as the uplink reference signal (UL-RS), it is also possible to transmit a measurement reference signal (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, DMRS can also be referred to as a user terminal specific reference signal (UE-specific Reference Signal).

[0368] (Base Station)

[0369] Figure 13 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0370] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the base station 10 further has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0371] The control unit 110 implements overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. that can be explained based on the common knowledge in the technical field related to the present disclosure.

[0372] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, a sequence, etc. to be transmitted as a signal, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0373] The transmitting and receiving unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0374] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may also be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0375] The transmitting and receiving antenna 130 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0376] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0377] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0378] The transmitting and receiving unit 120 (transmission processing unit 1211) may, for example, also perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0379] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering), Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0380] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0381] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing (filtering), demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0382] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing (filtering), demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0383] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also measure the received power (e.g., Reference Signal Received Power (RSRP)), received 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 also be output to the control unit 110.

[0384] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30 (e.g., the network node providing the NF), other base stations 10, etc., and obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0385] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0386] The transmission / reception unit 120 may also transmit the setting of the first Demodulation Reference Signal (DMRS) to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and transmit the downlink control information format including the antenna port field. The control unit 110 may also determine the combination corresponding to the value of the antenna port field based on the association between the multiple combinations of the multiple ports including the port of the first DMRS and the multiple values of the antenna port field.

[0387] The transmission / reception unit 120 may also transmit a setting of a first demodulation reference signal (DMRS) to which a frequency-domain orthogonal cover code (FD-OCC) longer than 2 is applied, and transmit a downlink control information format including an antenna port field. The control unit 110 may also determine, based on one of a first association and a second association, a combination corresponding to the value of the antenna port field. The first association associates a plurality of combinations of a plurality of ports including the port of the first DMRS and corresponding to a plurality of transmission / reception points with a plurality of values of the antenna port field. The second association associates a plurality of combinations of a plurality of ports including the port of the first DMRS and corresponding to one transmission / reception point with a plurality of values of the antenna port field

[0388] (User Equipment)

[0389] Figure 14 FIG. is an example showing the configuration of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively

[0390] In addition, in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can be assumed that the user equipment 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted

[0391] The control unit 210 implements overall control of the user equipment 20. The control unit 210 may be constituted by a controller, a control circuit, etc. described based on common knowledge in the technical field related to the present disclosure

[0392] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220

[0393] The transmission / reception 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 transmission / reception unit 220 may be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on common knowledge in the technical field related to the present disclosure

[0394] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of a transmission processing unit 2211 and an RF unit 222. The reception unit can also be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0395] The transmission / reception antenna 230 can be composed of an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0396] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0397] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0398] The transmission / reception unit 220 (transmission processing unit 2211) can, for example, also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0399] The transmission / reception unit 220 (transmission processing unit 2211) can also perform transmission processing such as channel coding (which can include error correction coding), modulation, mapping, filter processing (filtering), DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0400] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform, otherwise, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-mentioned transmission processing.

[0401] The transmission / reception unit 220 (RF unit 222) can also perform modulation to the radio frequency band, filter processing (filtering), amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0402] On the other hand, the transmission / reception unit 220 (RF unit 222) can also amplify, filter process (filtering process), and demodulate the received radio band signal into a baseband signal through the transmission / reception antenna 230, etc.

[0403] The transmission / reception unit 220 (reception processing unit 2212) can also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing (filtering process), demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the obtained baseband signal, and obtain user data, etc.

[0404] The transmission / reception unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0405] In addition, the transmission unit and reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0406] The transmission / reception unit 220 can also receive the setting of the first demodulation reference signal (DMRS) to which a frequency domain orthogonal cover code (FD-OCC) longer than 2 is applied, and receive the downlink control information format including the antenna port field. The control unit 210 can also determine the combination corresponding to the value of the antenna port field based on the association between multiple combinations of multiple ports including the port of the first DMRS and multiple values of the antenna port field.

[0407] For the first DMRS, the restriction on the association of the second DMRS port with other terminals may not be applied, and the second DMRS is applied with an FD-OCC of length 2.

[0408] For the first DMRS, a restriction different from the restriction on the association of the second DMRS port with other terminals may be applied, and the second DMRS is applied with an FD-OCC of length 2.

[0409] When the maximum number of symbols of the first DMRS is 2 and the number of preamble DMRS symbols is 2, the combination may also include the port of the first DMRS and the port of the second DMRS to which an FD-OCC of length 2 is applied.

[0410] The transmission and reception unit 220 may also receive a setting of a first demodulation reference signal (DMRS) to which a frequency-domain orthogonal cover code (FD-OCC) longer than 2 is applied, and receive a downlink control information format including an antenna port field. The control unit 210 may also determine, based on one of a first association and a second association, a combination corresponding to a value of the antenna port field, where the first association associates a plurality of combinations of ports including the port of the first DMRS and corresponding to a plurality of transmission and reception points, with a plurality of values of the antenna port field, and the second association associates a plurality of combinations of ports including the port of the first DMRS and corresponding to one transmission and reception point, with a plurality of values of the antenna port field.

[0411] Alternatively, the control unit 210 may use the first association when the plurality of transmission and reception points are set, and use the second association when the plurality of transmission and reception points are not set.

[0412] At least one of the first association and the second association may also include a combination of 3 or 4 ports, and the combination of ports includes the port of the first DMRS and the port of a second DMRS to which an FD-OCC of length 2 is applied.

[0413] The first association may also include a combination of a plurality of ports across a plurality of code division multiplexing (CDM) groups.

[0414] (Hardware Structure)

[0415] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, the implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected, and these multiple devices may be used. A functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0416] Here, in the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuration (setting), reconfiguration (re - setting), allocation (allocating, mapping), assignment, etc., but not limited to these. For example, a functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and its implementation method is not particularly limited.

[0417] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 15 FIG. is an example showing the hardware structure of a base station and a user terminal according to an embodiment. The above - mentioned base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0418] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be rewritten with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the figure, or can be configured not to include some devices.

[0419] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing can be executed by one processor, or can be executed simultaneously, sequentially, or by other methods by two or more processors. In addition, the processor 1001 can also be implemented by one or more chips.

[0420] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003, thereby realizing the function.

[0421] The processor 1001 enables, for example, an operating system to operate to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0422] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments may be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be applied to other functional blocks.

[0423] The memory 1002 may also be a computer-readable recording medium, and may be constituted by, for example, at least one of a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to one embodiment of the present disclosure.

[0424] The storage 1003 may also be a computer-readable recording medium, and may be constituted by, for example, at least one of a flexible disc, a floppy (registered trademark) disc, an optical disc (e.g., a compact disc (Compact Disc ROM (CD-ROM)) etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0425] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-described transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated into a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0426] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 may also have an integrated structure (e.g., a touch panel).

[0427] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between the respective devices.

[0428] In addition, the base station 10 and the user terminal 20 may also 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), a Field Programmable Gate Array (FPGA), etc., and a part or all of each functional block may also be implemented by this hardware. For example, the processor 1001 may also be implemented using at least one of these hardwares.

[0429] (Modification example)

[0430] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal can also be abbreviated as RS and may also be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0431] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of the numerology.

[0432] Here, the numerology may also be a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transmitter-receiver in the frequency domain, a specific windowing process performed by a transmitter-receiver in the time domain, etc.

[0433] A time slot may also be composed of one or more symbols (orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on the numerology.

[0434] A time slot may also include a plurality of mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0435] A radio frame, subframe, time slot, mini-slot, and symbol all represent time units for transmitting signals. A radio frame, subframe, time slot, mini-slot, and symbol may also use their respective other names. In addition, time units such as frames, subframes, time slots, mini-slots, and symbols in the present disclosure can also be rewritten with each other.

[0436] For example, a subframe can also be referred to as a TTI, multiple consecutive subframes can also be referred to as a TTI, a time slot or a mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in existing LTE, can also be a period shorter than 1 ms (for example, 1 - 13 symbols), or can also be a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a subframe, but as a time slot, mini-slot, etc.

[0437] Here, a TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of a TTI is not limited to this.

[0438] A TTI can also be a transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also become a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) in which a transport block, code block, codeword, etc. is actually mapped can also be shorter than the TTI.

[0439] In addition, when a time slot or a mini-slot is referred to as a TTI, one or more TTIs (that is, one or more time slots or one or more mini-slots) can also become the minimum time unit for scheduling. In addition, the number of time slots (number of mini-slots) constituting the minimum time unit of this scheduling can also be controlled.

[0440] A TTI having a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI, shortened subframe, short subframe, mini-slot, sub-time slot, time slot, etc.

[0441] In addition, a long TTI (for example, a normal TTI, subframe, etc.) can also be rewritten as a TTI having a time length exceeding 1 ms, and a short TTI (for example, a shortened TTI, etc.) can also be rewritten as a TTI having a TTI length less than that of the long TTI and 1 ms or more.

[0442] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (sub-carriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may also be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0443] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a time slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks respectively.

[0444] In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0445] In addition, a resource block may also be composed of one or more resource elements (REs). For example, one RE may also be a radio resource area of a subcarrier and a symbol.

[0446] A bandwidth part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the index of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and numbered additionally within that BWP.

[0447] An UL BWP (BWP for UL) and a DL BWP (BWP for DL) may also be included in a BWP. For a UE, one or more BWPs may also be set within a carrier.

[0448] At least one of the set BWPs may be activated, and the UE may not assume to transmit and receive specific signals / channels outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0449] In addition, structures such as the above-mentioned wireless frames, subframes, time slots, mini time slots, and symbols are merely illustrative. For example, the number of subframes included in a wireless frame, the number of time slots in each subframe or wireless frame, the number of mini time slots included in a time slot, the symbols included in a time slot or mini time slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0450] In addition, the information, parameters, etc. described in this disclosure can be represented by absolute values, relative values with respect to a specific value, or can also be represented by corresponding other information. For example, wireless resources can also be indicated by a specific index.

[0451] In this disclosure, the names used for parameters, etc. are not restrictive names in all aspects. Furthermore, mathematical expressions, etc. using these parameters can also be different from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name. Therefore, the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0452] The information, signals, etc. described in this disclosure can also be represented using any one of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0453] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer to a lower layer, and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0454] The input and output information, signals, etc. can be stored in a specific location (e.g., a memory), or can be managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0455] The notification of information is not limited to the methods / embodiments described in the present disclosure, and other methods can also be used. For example, the notification of information in the present disclosure can also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0456] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message, and for example, it can also be an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Re - setting (RRCConnection Reconfiguration)) message, etc. In addition, MAC signaling can be notified, for example, by using a MAC Control Element (MACControl Element (CE)).

[0457] In addition, the notification of specific information (e.g., the notification of "is X") is not limited to explicit notification, and can also be performed implicitly (e.g., by not performing the notification of the specific information, or by the notification of other information).

[0458] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true - false value (Boolean value) represented by true or false, and can also be made by a numerical comparison (e.g., comparison with a specific value).

[0459] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, threads of execution, procedures, functions, etc.

[0460] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0461] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0462] In this disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission 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", "panel", etc. can be used interchangeably.

[0463] In the present disclosure, terms such as "Base Station (BS)", "radio 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", "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0464] A base station can accommodate one or more (e.g., three) cells. In the case where a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within that coverage range.

[0465] In the present disclosure, the situation where a base station sends information to a terminal can also be rewritten as the base station instructing the terminal to perform control / operation based on that information.

[0466] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal" can be used interchangeably.

[0467] There are also cases where a mobile station is referred to by terms such as subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0468] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station can also be a device mounted in a moving object, the moving object itself, etc.

[0469] The moving body refers to an object that can move, with an arbitrary moving speed, and of course includes the case where the moving body stops. The moving body includes, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, fork lifts, trains, buses, trolleys, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, hot air balloons, and objects mounted on them. In addition, it is not limited to these. Furthermore, the moving body can also be a moving body that autonomously travels based on an operation instruction.

[0470] The moving body can be either a means of transportation (e.g., vehicles, airplanes, etc.), or a moving body that moves in an unmanned manner (e.g., drones, autonomous vehicles, etc.), or a robot (humanoid or non-humanoid). Additionally, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0471] Figure 16 It is a diagram showing an example of a vehicle related to an 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 rotational speed sensor 51, a 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.

[0472] The drive unit 41 is constituted by, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. The steering unit 42 is configured to include at least a steering wheel (also referred to as a handwheel), and steers 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.

[0473] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (e.g., an input / output (I / O) port) 63. Signals from various sensors 50 - 58 provided in the vehicle are input into the electronic control unit 49. The electronic control unit 49 may also be referred to as an electronic control unit (ECU).

[0474] As signals from various sensors 50 - 58, there are current signals from the current sensor 50 that senses the current of the motor, rotation speed signals of the front wheels 46 / rear wheels 47 obtained by the rotation speed sensor 51, air pressure signals of the front wheels 46 / rear wheels 47 obtained by the air pressure sensor 52, vehicle speed signals obtained by the vehicle speed sensor 53, acceleration signals obtained by the acceleration sensor 54, depression amount signals of the accelerator pedal 43 obtained by the accelerator pedal sensor 55, depression amount signals of the brake pedal 44 obtained by the brake pedal sensor 56, operation signals of the shift lever 45 obtained by the shift lever sensor 57, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 58, and so on.

[0475] The information service unit 59 is composed of various devices such as a navigation system, an audio system, speakers, a display, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses the information obtained from external devices via a communication module 60, etc., to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0476] The information service unit 59 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) for accepting inputs from the outside, and may also include output devices (e.g., a display, speakers, an LED light, a touch panel, etc.) for implementing outputs to the outside.

[0477] The driving assistance system unit 64 is composed of a millimeter-wave radar, a Light Detection and Ranging (LiDAR), a camera, a locator (e.g., a Global Navigation Satellite System (GNSS), etc.), map information (e.g., a High Definition (HD) map, an Autonomous Vehicle (AV) map, etc.), a gyroscope system (e.g., an inertial measurement device (an Inertial Measurement Unit (IMU)), an inertial navigation device (an Inertial Navigation System (INS)), etc.), an Artificial Intelligence (AI) chip, an AI processor, and various devices that provide functions for preventing accidents in advance or reducing the driving burden of the driver, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 64 transmits and receives various information via the communication module 60 to implement the driving assistance function or the autonomous driving function.

[0478] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 between the driving unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62, and various sensors 50-58 in the electronic control unit 49 of the vehicle 40.

[0479] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49 and is a communication device capable of communicating with external devices. For example, various information is transmitted and received via wireless communication between the communication module 60 and external devices. The communication module 60 can be both inside and outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, the user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and the user terminal 20 (and can also function as at least one of the base station 10 and the user terminal 20).

[0480] The communication module 60 can also transmit at least one of the following to an external device via wireless communication: the signals from the various sensors 50-58 input to the electronic control unit 49, the information obtained based on the signals, and the information based on the input from the outside (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. can also be referred to as an input unit that accepts input. For example, the PUSCH transmitted via the communication module 60 can also include the information based on the above input.

[0481] The communication module 60 receives various types of information (traffic information, traffic light information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 can also be referred to as an output unit that outputs information (for example, the information output to devices such as a display and a speaker based on the PDSCH received via the communication module 60 (or the data / information decoded according to the PDSCH)).

[0482] In addition, the communication module 60 stores the various types of information received from the external device in the memory 62 that can be utilized by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc. provided in the vehicle 40.

[0483] In addition, the base station in the present disclosure can also be rewritten as a user terminal. For example, for a structure in which the communication between the base station and the user terminal is replaced with the communication between multiple user terminals (for example, it can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various modes / embodiments of the present disclosure can also be applied. In this case, it can also be configured such that the user terminal 20 has the functions of the above base station 10. In addition, terms such as "uplink" and "downlink" can also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, the uplink channel, the downlink channel, etc. can also be rewritten as the sidelink channel.

[0484] Similarly, the user terminal in the present disclosure can also be rewritten as a base station. In this case, it can also be configured such that the base station 10 has the functions of the above user terminal 20.

[0485] In the present disclosure, an action performed by a base station may sometimes be performed by its upper node according to circumstances. Apparently, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0486] Each mode / embodiment described in the present disclosure may be used alone, in combination, or switched during execution. In addition, the processing procedures, timings, flowcharts, etc. of each mode / embodiment described in the present disclosure may also be rearranged as long as there is no contradiction. For example, regarding the method described in the present disclosure, elements of various steps are presented in the illustrated order, but are not limited to the specific order presented.

[0487] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG (x is an integer or a decimal, for example)), 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 (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended, modified, generated, or defined based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) for application.

[0488] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0489] Any reference to an element using designations such as "first", "second", etc. used in the present disclosure does not fully define the quantity or order of these elements. These designations can be used in the present disclosure as a convenient method for distinguishing between more than two elements. Therefore, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must in some form take precedence over the second element.

[0490] The term "determining" as used in the present disclosure can encompass a variety of actions. For example, "determining" can also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structure), ascertaining, etc. are regarded as performing "determining".

[0491] In addition, "determining" can also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0492] In addition, "determining" can also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is, "determining" can also be a case where some actions are regarded as performing "determining".

[0493] In addition, "determining" can also be rewritten as "assuming", "expecting", "considering", etc.

[0494] The "maximum transmit power" described in the present disclosure can either mean the maximum value of the transmit power, or the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0495] As used in this disclosure, terms such as "connected" and "coupled", and all variations thereof, mean all direct or indirect connections or couplings between two or more elements, and can include the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can also be rewritten as "access".

[0496] In this disclosure, when two elements are connected, it is possible to consider that they are "connected" or "coupled" to each other by using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-exhaustive examples, by using electromagnetic energy having wavelengths in the radio frequency domain, microwave region, optical (both visible and invisible) region, etc., so as to be "connected" or "coupled" to each other.

[0497] In this disclosure, a term such as "A is different from B" can also mean that "A and B are different from each other". In addition, this term can also mean that "A and B are each different from C". Terms such as "separated" and "coupled" can also be interpreted in the same way as "different".

[0498] When the terms "include", "including", and their variations are used in this disclosure, these terms, like the term "comprising", are meant to be inclusive. Further, the term "or" used in this disclosure does not mean exclusive or.

[0499] In this disclosure, for example, in the case where articles are added by translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0500] In this disclosure, terms such as "below", "less than", "above", "more than", "equal" can also be rewritten with each other. In addition, in this disclosure, terms meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc., are not limited to the positive degree, comparative degree, and superlative degree, and can also be rewritten with each other. In addition, in this disclosure, for terms meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc., when the expression "the i-th" (i is an arbitrary integer) is attached, it is not limited to the positive degree, comparative degree, and superlative degree, and can also be rewritten with each other (for example, "highest" and "the i-th highest" can also be rewritten with each other).

[0501] In the present disclosure, terms such as "of", "for", "regarding", "related to", "associated with", etc. may also be rewritten with each other.

[0502] As described above, the invention related to the present disclosure has been described in detail. However, for those skilled in the art, the invention related to the present disclosure is obviously not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in modified and changed forms without departing from the gist and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not carry any restrictive meaning for the invention related to the present disclosure.

[0503] This application is based on Japanese Patent Application No. 2022-183447 filed on November 16, 2022. The entire content thereof is incorporated herein.

Claims

1. A terminal, comprising: a receiving unit, configured to receive a setting of a first demodulation reference signal (DMRS) to which a frequency-domain orthogonal cover code (FD-OCC) longer than 2 is applied, and receive a downlink control information format including an antenna port field; and a control unit, configured to determine a combination corresponding to a value of the antenna port field based on one of a first association and a second association, where the first association associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to multiple transmit-receive points, with multiple values of the antenna port field, and the second association associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to one transmit-receive point, with multiple values of the antenna port field.

2. The terminal according to claim 1, wherein the control unit uses the first association when the multiple transmit-receive points are set, and uses the second association when the multiple transmit-receive points are not set.

3. The terminal according to claim 1, wherein at least one of the first association and the second association includes a combination of 3 or 4 ports, and the combination of ports includes the port of the first DMRS and the port of a second DMRS to which an FD-OCC of length 2 is applied.

4. The terminal according to claim 1, wherein the first association includes a combination of multiple ports across multiple code division multiplexing (CDM) groups.

5. A wireless communication method, which is a wireless communication method of a terminal, comprising: a step of receiving a setting of a first demodulation reference signal (DMRS) to which a frequency-domain orthogonal cover code (FD-OCC) longer than 2 is applied, and receiving a downlink control information format including an antenna port field; and a step of determining a combination corresponding to a value of the antenna port field based on one of a first association and a second association, where the first association associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to multiple transmit-receive points, with multiple values of the antenna port field, and the second association associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to one transmit-receive point, with multiple values of the antenna port field.

6. A base station, comprising: a transmitting unit, configured to transmit a setting of a first demodulation reference signal (DMRS) to which a frequency-domain orthogonal cover code (FD-OCC) longer than 2 is applied, and transmit a downlink control information format including an antenna port field; and a control unit, configured to determine a combination corresponding to a value of the antenna port field based on one of a first association and a second association, where the first association associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to multiple transmit-receive points, with multiple values of the antenna port field, and the second association associates multiple combinations of multiple ports including the port of the first DMRS and corresponding to one transmit-receive point, with multiple values of the antenna port field.

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