Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives downlink control information (DCI) for scheduling a downlink shared channel; and a control unit that, on the basis of a field which pertains to an antenna port included in the DCI, determines a combination of more than two DMRS ports in a single code division multiplexing (CDM) group corresponding to a demodulation reference signal (DMRS) for the downlink shared channel.

Description

[Technical Field]

[0001] This disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems. law, basis earth Stations and systems To relate to. [Background technology]

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

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

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

[0005] For future wireless communication systems (e.g., Rel.18 NR), demodulation reference signal (DMRS) ports for uplink shared channels (Physical Uplink Shared Channels (PUSCH)) capable of supporting more than 4 layers are being considered. Furthermore, for Rel.18 NR, increasing the number of orthogonal DMRS ports for PUSCH / downlink shared channels (Physical Downlink Shared Channels (PDSCH)) is also being considered. These new DMRS ports, distinct from existing DMRS ports (also called Rel.15 DMRS ports), are also referred to as Rel.18 DMRS ports.

[0006] However, if the number of DMRS ports increases, the question arises as to how to control (e.g., configure / instruct) those DMRS ports.

[0007] Therefore, this disclosure relates to a terminal and wireless communication method that can properly perform communications even when the number of DMRS ports is increased. law, basis earth Stations and systems One of the purposes is to provide it. [Means for solving the problem]

[0008] A terminal relating to one aspect of this disclosure is The upper layer parameters configure the activation of the DeModulation Reference Signal (DMRS) port, and the physical lower layer parameters configure the activation of the DeModulation Reference Signal (DMRS) port. Link sharing channel (Physical Downlink Shared Channel (PDSCH)) Downlink Control Information (DCI) for scheduling ) and, The receiving unit that receives and the field relating to the antenna port included in the DCI PDSCH Therefore D MR Sa control unit that determines a combination of more than two DMRS ports within one corresponding code division multiplexing (CDM) group A combination of DMRS ports greater than the above 2 includes one or more extended DMRS ports enabled by the setting of the above-upper layer parameters. . [Effect of the Invention]

[0009] According to one aspect of the present disclosure, communication can be appropriately performed even when the number of DMRS ports increases. [Brief Description of the Drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of parameters for PDSCH DMRS. [Figure 2] FIG. 2 is a diagram showing an example of parameters for PUSCH DMRS. [Figure 3] FIGS. 3A - 3D are diagrams showing an example of a table of antenna ports to be referred to when the transform precoder in Rel.15 is invalid, DMRS type = 1, and the maximum length of DMRS = 1. [Figure 4] FIGS. 4A - 4D are diagrams showing an example of a table of antenna ports to be referred to when the transform precoder in Rel.15 is invalid, DMRS type = 1, and the maximum length of DMRS = 2. [Figure 5] FIGS. 5A - 5D are diagrams showing an example of a table of antenna ports to be referred to when the transform precoder in Rel.15 is invalid, DMRS type = 2, and the maximum length of DMRS = 1. [Figure 6] FIGS. 6A and 6B are diagrams showing an example of a table of antenna ports to be referred to when the transform precoder in Rel.15 is invalid, DMRS type = 2, and the maximum length of DMRS = 2. [Figure 7] FIGS. 7A and 7B are diagrams showing an example of a table of antenna ports to be referred to when the transform precoder in Rel.15 is invalid, DMRS type = 2, and the maximum length of DMRS = 2. [Figure 8]Figures 8A-8D show an example table of reference antenna ports when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 2. [Figure 9] Figures 9A and 9B show an example table of reference antenna ports when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 1. [Figure 10] Figures 10A-10D show an example table of reference antenna ports when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 2. [Figure 11] Figure 11 shows an example of parameters for DMRS configuration type 1 for Rel.18 DMRS. [Figure 12] Figure 12 shows an example of parameters for DMRS configuration type 2 for Rel.18 DMRS. [Figure 13] Figure 13 shows an example where three or four DMRS ports are specified within a CDM group when a length 4 FDD-OCC is supported. [Figure 14] Figure 14 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 5. [Figure 15] Figure 15 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 6. [Figure 16] Figure 16 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 7. [Figure 17]Figure 17 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 8. [Figure 18] Figure 18 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 5. [Figure 19] Figure 19 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 6. [Figure 20] Figure 20 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 7. [Figure 21] Figure 21 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 8. [Figure 22] Figure 22 shows an example of a reference antenna port indication table according to Embodiment #0B, where DMRS type = 1 and DMRS maximum length = 1. [Figure 23] Figure 23 shows an example of a reference antenna port indication table for Embodiment #0B, where DMRS type = 1 and DMRS maximum length = 1. [Figure 24] Figure 24 shows an example of a reference antenna port indication table for Embodiment #0B, where DMRS type = 2 and DMRS maximum length = 1. [Figure 25] Figure 25 shows an example of a reference antenna port indication table for Embodiment #0B, where DMRS type = 2 and DMRS maximum length = 1. [Figure 26]Figure 26 shows an example of a reference antenna port indication table according to Embodiment #1, where DMRS type = 1 and DMRS maximum length = 1. [Figure 27] Figure 27 shows an example of a reference antenna port indication table according to Embodiment #1, where DMRS type = 2 and DMRS maximum length = 1. [Figure 28] Figure 28 shows an example of a reference antenna port indication table according to Embodiment #2, where DMRS type = 1 and DMRS maximum length = 1. [Figure 29] Figure 29 shows an example of a reference antenna port indication table according to Embodiment #2, where DMRS type = 2 and DMRS maximum length = 1. [Figure 30] Figure 30 shows an example of a reference antenna port indication table according to Embodiment #3, where DMRS type = 1 and DMRS maximum length = 2. [Figure 31] Figure 31 shows an example of a reference antenna port indication table according to Embodiment #3, where DMRS type = 2 and DMRS maximum length = 2. [Figure 32] Figure 32 shows an example of a reference antenna port indication table according to Embodiment #4, where DMRS type = 1 and DMRS maximum length = 2. [Figure 33] Figure 33 shows an example of a reference antenna port indication table according to Embodiment #4, where DMRS type = 2 and DMRS maximum length = 2. [Figure 34] Figure 34 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 35] Figure 35 shows an example of the configuration of a base station according to one embodiment. [Figure 36] Figure 36 shows an example of the configuration of a user terminal according to one embodiment. [Figure 37] Figure 37 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 38] Figure 38 shows an example of a vehicle according to one embodiment. [Modes for carrying out the invention]

[0011] (SRS, PUSCH transmission control) In Rel.15 NR, a terminal (user terminal, User Equipment (UE)) may receive information used to transmit a measurement reference signal (e.g., a Sounding Reference Signal (SRS)) (e.g., SRS configuration information, for example, parameters in the "SRS-Config" of the RRC control element).

[0012] Specifically, the UE may receive at least one of the following: information about one or more SRS resource sets (SRS resource set information, e.g., "SRS-ResourceSet" of the RRC control element) and information about one or more SRS resources (SRS resource information, e.g., "SRS-Resource" of the RRC control element).

[0013] A single SRS resource set may be associated with a predetermined number of SRS resources (a predetermined number of SRS resources may be grouped together). Each SRS resource may be identified by an SRS Resource Indicator (SRI) or an SRS Resource Identifier.

[0014] SRS resource set information may include the SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, the SRS resource type, and information on the SRS usage.

[0015] Here, the SRS resource type may be one of the following: Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), or Aperiodic SRS (A-SRS). The UE may transmit P-SRS and SP-SRS periodically (or periodically after activation), and A-SRS based on SRS requests in Downlink Control Information (DCI).

[0016] Furthermore, the application (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management, codebook (CB), noncodebook (NCB), antenna switching, etc. SRS for codebook or noncodebook applications may be used to determine the precoder for SRI-based codebook-based or noncodebook-based uplink shared channel (PUSCH) transmission.

[0017] For example, in the case of codebook-based transmission, the UE may determine the precoder (precoding matrix) for PUSCH transmission based on the SRI, transmission rank (which may also be simply called rank), and Transmitted Precoding Matrix Indicator (TPMI). In the case of non-codebook-based transmission, the UE may determine the precoder for PUSCH transmission based on the SRI.

[0018] SRS resource information may include SRS resource ID (SRS-ResourceId), number of SRS ports, SRS port number, transmit comb, SRS resource mapping (e.g., time and / or frequency resource location, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, SRS resource type, sequence ID, SRS spatial relationship information, etc.

[0019] The spatial relationship information of the SRS (for example, the "spatialRelationInfo" element of the RRC information element) may indicate spatial relationship information between a predetermined reference signal and the SRS. The predetermined reference signal may be at least one of a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (for example, another SRS). The SS / PBCH block may be called a Synchronization Signal Block (SSB).

[0020] The spatial relationship information of the SRS may include at least one of the following as an index for the predetermined reference signal: the SSB index, the CSI-RS resource ID, and the SRS resource ID.

[0021] In this disclosure, the terms SSB index, SSB resource ID, and SSB Resource Indicator (SSBRI) may be interpreted interchangeably. Similarly, the terms CSI-RS index, CSI-RS resource ID, and CSI-RS Resource Indicator (CRI) may be interpreted interchangeably. Furthermore, the terms SRS index, SRS resource ID, and SRI may be interpreted interchangeably.

[0022] The spatial relationship information of the SRS may include a serving cell index, BWP index (BWP ID), etc., corresponding to the predetermined reference signal mentioned above.

[0023] If a UE configures spatial relationship information regarding an SSB or CSI-RS and an SRS resource, it may transmit the SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain receive filter) used for receiving the SSB or CSI-RS. In this case, the UE may assume that the UE receive beam for the SSB or CSI-RS and the UE transmit beam for the SRS are the same.

[0024] If a UE sets spatial relationship information regarding a target SRS resource and another SRS (reference SRS), it may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the one used for transmitting the reference SRS. In other words, in this case, the UE may assume that the UE transmit beam for the reference SRS and the UE transmit beam for the target SRS are the same.

[0025] The UE may determine the spatial relationships of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on the value of a predetermined field (e.g., the SRS resource identifier (SRI) field). Specifically, the UE may use spatial relationship information of the SRS resource (e.g., "spatialRelationInfo" of the RRC information element) determined based on the value of the predetermined field (e.g., SRI) for the PUSCH transmission.

[0026] In Rel.15 / 16 NR, when using codebook-based transmission for PUSCH, the UE may have up to two SRS resources, with the codebook's SRS resource set configured by the RRC, and one of those up to two SRS resources indicated by the DCI (1-bit SRI field). The PUSCH transmit beam will be specified by the SRI field.

[0027] The UE may determine the TPMI and layer number (transmit rank) for PUSCH based on the precoding information and layer number field (hereinafter also referred to as the precoding information field). The UE may select a precoder from the uplink codebook for the same number of ports as the number of SRS ports indicated by the higher layer parameter "nrofSRS-Ports" set for the SRS resource specified by the SRI field, based on the TPMI, layer number, etc.

[0028] In Rel.15 / 16 NR, when using non-codebook-based transmission for PUSCH, the UE may have up to four SRS resources, with the non-codebook SRS resource set configured by the RRC, and one or more of these up to four SRS resources may be indicated by the DCI (2-bit SRI field).

[0029] The UE may determine the number of layers (transmission rank) for PUSCH based on the above SRI field. For example, the UE may determine that the number of SRS resources specified by the above SRI field is the same as the number of layers for PUSCH. The UE may also calculate the precoder for the above SRS resources.

[0030] If a CSI-RS (which may also be called an associated CSI-RS) associated with the SRS resource (or the SRS resource set to which the SRS resource belongs) is configured at a higher layer, the PUSCH transmit beam may be calculated based on the configured associated CSI-RS (measurements). Otherwise, the PUSCH transmit beam may be specified by the SRI.

[0031] Furthermore, the UE may be configured to use either codebook-based or non-codebook-based push transmission via a higher-layer parameter "txConfig" that indicates the transmission scheme. This parameter may represent the values ​​"codebook" or "noncodebook".

[0032] In this disclosure, codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may mean PUSCH when “codebook” is set as the transmission scheme for the UE. In this disclosure, non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may mean PUSCH when “non-codebook” is set as the transmission scheme for the UE.

[0033] (DMRS) The front-loaded DMRS is the first (first symbol or near the first symbol) DMRS for faster demodulation. Additional DMRS can be set by the RRC for fast-moving UEs or high modulation and coding scheme (MCS) / rank. The frequency position of the additional DMRS is the same as that of the front-loaded DMRS.

[0034] For the time domain, either DMRS mapping type A or B is configured. In DMRS mapping type A, DMRS position l_0 is counted by the symbol index within the slot. l_0 is set by a parameter (dmrs-TypeA-Position) in the MIB or Common Serving Cell Configuration (ServingCellConfigCommon). DMRS position 0 (reference point l) means the first symbol in the slot or each frequency hop. In DMRS mapping type B, DMRS position l_0 is counted by the symbol index within the PDSCH / PUSCH. l_0 is always 0. DMRS position 0 (reference point l) means the first symbol in the PDSCH / PUSCH or each frequency hop.

[0035] The location of DMRS is defined by a specification table and depends on the duration of PDSCH / PUSCH. The location of additional DMRS is fixed.

[0036] For each frequency domain, either (PDSCH / PUSCH)DMRS configuration type 1 or type 2 is configured. DMRS configuration type 1 has a comb structure and is applicable to both Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) and Discrete Fourier Transform Spread OFDM (DFT-s-OFDM). DMRS configuration type 2 is applicable only to CP-OFDM.

[0037] Note that CP-OFDM may be used when transform precoding (also called transform precoder) is disabled (e.g., transformPrecoder parameter = "disabled"). DFT-S-OFDM may be used when transform precoder is enabled (e.g., transformPrecoder parameter = "enabled").

[0038] Single-symbol DMRS or double-symbol DMRS may be set in the UE.

[0039] Single-symbol DMRS is commonly used (it is a mandatory feature in Rel. 15). In single-symbol DMRS, the number of additional DMRS (symbols) is {0, 1, 2, 3}. Single-symbol DMRS supports both cases where frequency hopping is enabled and disabled. If the maximum length (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is not set, single-symbol DMRS is used.

[0040] Double-symbol DMRS is used for more DMRS ports (especially MU-MIMO). In double-symbol DMRS, the number of additional DMRS (symbols) is {0,1}. Double-symbol DMRS supports the case where frequency hopping is disabled. If the maximum length (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is 2 (len2), whether it is single-symbol DMRS or double-symbol DMRS is determined by DCI or configured grant.

[0041] Based on the above, the following combinations of possible DMRS configuration patterns are conceivable. • DMRS configuration type 1, DMRS mapping type A, single symbol DMRS • DMRS configuration type 1, DMRS mapping type A, double symbol DMRS • DMRS configuration type 1, DMRS mapping type B, single symbol DMRS • DMRS configuration type 1, DMRS mapping type B, double symbol DMRS • DMRS configuration type 2, DMRS mapping type A, single symbol DMRS • DMRS configuration type 2, DMRS mapping type A, double symbol DMRS • DMRS configuration type 2, DMRS mapping type B, single symbol DMRS • DMRS configuration type 2, DMRS mapping type B, double symbol DMRS

[0042] Multiple DMRS ports mapped to the same RE (Time and Frequency Resource) may be called a DMRS Code Division Multiplexing (CDM) group.

[0043] For DMRS configuration type 1 and single-symbol DMRS, four DMRS ports can be used. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC. Between multiple DMRS CDM groups (two DMRS CDM groups), two DMRS ports are multiplexed by FDM.

[0044] For DMRS configuration type 1 and double-symbol DMRS, eight DMRS ports can be used. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC, and two DMRS ports are multiplexed by a TD OCC. Between multiple DMRS CDM groups (two DMRS CDM groups), two DMRS ports are multiplexed by FDM.

[0045] Six DMRS ports can be used for DMRS configuration type 2 and single-symbol DMRS. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC. Between multiple DMRS CDM groups (three DMRS CDM groups), three DMRS ports are multiplexed by FDM.

[0046] Twelve DMRS ports can be used for DMRS configuration type 2 and double-symbol DMRS. Within each DMRS CDM group, two DMRS ports are multiplexed by a length 2 FD OCC, and two DMRS ports are multiplexed by a TD OCC. Between multiple DMRS CDM groups (three DMRS CDM groups), three DMRS ports are multiplexed by FDM.

[0047] Here, we have shown an example of DMRS mapping type B, but DMRS mapping type A is similar.

[0048] Figure 1 shows an example of parameters for PDSCH DMRS. DMRS ports 1000-1008 can be used for DMRS configuration type 1, and DMRS port 1000-1011 can be used for DMRS configuration type 2.

[0049] Figure 2 shows an example of parameters for PUSCH DMRS. DMRS ports 0-7 can be used for DMRS configuration type 1, and DMRS ports 0-11 can be used for DMRS configuration type 2.

[0050] (Reference signal port) Multiple port reference signals (e.g., demodulation reference signal (DMRS), CSI-RS) are used for purposes such as orthogonalizing the MIMO layer.

[0051] For example, for Single User MIMO (SU-MIMO), different DMRS ports / CSI-RS ports may be configured for each layer. For Multi User MIMO (MU-MIMO), different DMRS ports / CSI-RS ports may be configured for each layer within a single UE, and for each UE as well.

[0052] Furthermore, using a number of CSI-RS ports greater than the number of layers used in the data is expected to enable more accurate measurement of channel status based on the CSI-RS, thereby contributing to improved throughput.

[0053] In Rel.15 NR, multi-port DMRS can support up to 8 ports for Type 1 DMRS (in other words, DMRS configuration type 1) and up to 12 ports for Type 2 DMRS (in other words, DMRS configuration type 2) by using technologies such as Frequency Division Multiplexing (FDM), Frequency Domain Orthogonal Cover Code (FD-OCC), and Time Domain OCC (TD-OCC).

[0054] In Rel.15 NR, the above FDM uses a comb-shaped transmission frequency pattern (comb-shaped resource set). The above FD-OCC uses cyclic shift (CS). Furthermore, the above TD-OCC can only be applied to double-symbol DMRS.

[0055] The terms OCC in this disclosure may be interpreted interchangeably with orthogonal codes, orthogonalization, cyclic shifts, and the like.

[0056] The type of DMRS may also be called the DMRS Configuration type.

[0057] Among DMRSs, those that perform resource mapping in units of two consecutive (adjacent) symbols may be called double-symbol DMRS, and those that perform resource mapping in units of one symbol may be called single-symbol DMRS.

[0058] Both DMRSs may be mapped to one or more symbols per slot, depending on the length of the data channel. A DMRS mapped to the beginning of a data symbol may be called a front-loaded DMRS, while a DMRS mapped additionally to any other position may be called an additional DMRS.

[0059] In the case of DMRS configuration type 1 and single-symbol DMRS, Comb and CS may be used for orthogonalization. For example, up to four antenna ports (APs) may be supported by using two types of Comb and two types of CS (Comb2+2CS).

[0060] In the case of DMRS configuration type 1 and double symbol DMRS, Comb, CS, and TD-OCC may be used for orthogonalization. For example, up to 8 APs may be supported using two types of Comb, two types of CS, and TD-OCC ({1,1} and {1,-1}).

[0061] In the case of DMRS configuration type 2 and single-symbol DMRS, FD-OCC may be used for orthogonalization. For example, up to six APs may be supported by applying orthogonal codes (2-FD-OCC) to two Resource Elements (REs) that are adjacent to each other in the frequency direction.

[0062] In the case of DMRS configuration type 2 and double-symbol DMRS, FD-OCC and TD-OCC may be used for orthogonalization. For example, up to 12 APs may be supported by applying orthogonal codes (2-FD-OCC) to two frequency-adjacent REs and TD-OCC ({1,1} and {1,-1}) to two time-adjacent REs.

[0063] Furthermore, in Rel.15 NR, multi-port CSI-RS supports up to 32 ports by using methods such as FDM, Time Division Multiplexing (TDM), Frequency Domain OCC, and Time Domain OCC. The same methods as those used for DMRS described above may also be applied to orthogonalize the CSI-RS.

[0064] Now, the group of DMRS ports orthogonalized by FD-OCC / TD-OCC as described above is also called a Code Division Multiplexing (CDM) group.

[0065] Different CDM groups are orthogonal due to FDM. However, within the same CDM group, channel variations may disrupt the orthogonality of the applied OCC. In this case, receiving signals within the same CDM group at different receiving powers may cause a near-far problem, potentially compromising orthogonality.

[0066] Here, we will explain the TD-OCC / FD-OCC of DMRS in Rel.15 NR. DMRS mapped to a Resource Element (RE) is a DMRS series with FD-OCC parameters (which may also be called series elements, etc.) w f (k') and the TD-OCC parameters (which may also be called sequence elements, etc.) w t It may also be a sequence obtained by multiplying (l') by .

[0067] Both the TD-OCC and FD-OCC of the DMRS in Rel.15 NR correspond to OCC with a sequence length (which may also be called the OCC length) of 2. Therefore, all possible values of k' and l' are 0 and 1. By multiplying this FD-OCC by the RE unit, two-port DMRS can be multiplexed using the same time and frequency resources (2RE). When both this FD-OCC and TD-OCC are applied, four-port DMRS can be multiplexed using the same time and frequency resources (4RE).

[0068] The two existing DMRS port tables for PDSCH shown in FIG. 1 correspond to DMRS setting types 1 and 2, respectively. Note that p indicates the antenna port number, and Δ indicates the parameter for shifting (offsetting) the frequency resource.

[0069] For example, for antenna ports 1000 and 1001, {w f (0), w f (1)} = {+1, +1} and {w f (0), w f (1)} = {+1, -1} are applied, and they are orthogonalized using FD-OCC.

[0070] For antenna ports 1000 - 1001 and antenna ports 1002 - 1003 (and in the case of type 2, also antenna ports 1004 - 1005), different values of Δ are applied, and thus FDM is applied. Therefore, antenna ports 1000 - 1003 (or 1000 - 1005) corresponding to single-symbol DMRS are orthogonalized using FD-OCC and FDM.

[0071] For type 1 antenna ports 1000 - 1003 and antenna ports 1004 - 1007, {w t (0), w t (1)} = {+1, +1} and {w t (0), w t(1)}={+1,-1} is applied, resulting in orthogonalization using TD-OCC. Therefore, antenna ports 1000-1007 (or 1000-1011) corresponding to double symbol DMRS are orthogonalized using FD-OCC, TD-OCC, and FDM.

[0072] For CP-OFDM only, the following are being considered: specifying a larger number of orthogonal DMRS ports for DL / UL MU-MIMO (without increasing DMRS overhead); creating a common design between DL and UL DMRS; up to 24 orthogonal DMRS ports; and doubling the maximum number of orthogonal DMRS ports for both single-symbol DMRS and double-symbol DMRS for each applicable DMRS configuration type.

[0073] In Rel.15, the following cases 1 to 4 can be set. [Case 1] Single Symbol DMRS with DMRS Configuration Type 1 The total number of DMRS ports is 2 (by comb / FDM) × 2 (by FD OCC) = 4 ports. [Case 2] Double symbol DMRS with DMRS configuration type 1 The total number of DMRS ports is 2 (by comb / FDM) × 2 (by FD OCC) × 2 (by TD OCC) = 8 ports. [Case 3] Single Symbol DMRS with DMRS Configuration Type 2 The total number of DMRS ports is 3 (by FDM) × 2 (by FD OCC) = 6 ports. [Case 4] Double symbol DMRS with DMRS configuration type 2 The total number of DMRS ports is 3 (by comb) × 2 (by FD OCC) × 2 (by TD OCC) = 12 ports.

[0074] Furthermore, in Cases 1 through 4 of Rel.15, the mapping of CDM groups and DMRS port indices is as follows:

[0075] [Case 1] Four ports and two CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1} and CDM group #1 may correspond to DMRS port index {2,3}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001} and CDM group #1 may correspond to DMRS port index {1002,1003}.

[0076] [Case 2] 8 ports and 2 CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1,4,5} and CDM group #1 may correspond to DMRS port index {2,3,6,7}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001,1004,1005} and CDM group #1 may correspond to DMRS port index {1002,1003,1006,1007}.

[0077] [Case 3] Six ports and three CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1}, CDM group #1 may correspond to DMRS port index {2,3}, and CDM group #2 may correspond to DMRS port index {4,5}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001}, CDM group #1 may correspond to DMRS port index {1002,1003}, and CDM group #2 may correspond to DMRS port index {1004,1005}.

[0078] [Case 4] 12 ports and 3 CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port indices {0,1,6,7}, CDM group #1 to DMRS port indices {2,3,8,9}, and CDM group #2 to DMRS port indices {4,5,10,11}. For PDSCH, CDM group #0 may correspond to DMRS port indices {1000,1001,1006,1007}, CDM group #1 to DMRS port indices {1002,1003,1008,1009}, and CDM group #2 to DMRS port indices {1004,1005,1010,1011}.

[0079] <Rel.15におけるアンテナポートのテーブル> Figure 3A-3D shows an example of a table of reference antenna ports in Rel.15 when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 1.

[0080] Figure 3A shows an example of a table of antenna ports corresponding to rank 1. In this example, values ​​from 0 to 5 in the "Antenna ports" field are associated with different sets of DMRS ports (1 antenna port).

[0081] Figure 3B shows an example of a table of antenna ports corresponding to rank 2. In this example, each value of the antenna port field from 0 to 3 corresponds to a different set of DMRS ports (2 antenna ports).

[0082] Figure 3C shows an example of a table of antenna ports corresponding to rank 3. In this example, each value of the antenna port field = 0 is associated with a different set of DMRS ports (3 antenna ports).

[0083] Figure 3D shows an example of an antenna port table corresponding to rank 4. In this example, each value of the antenna port field = 0 is associated with a different set of DMRS ports (4 antenna ports).

[0084] Figures 4A-4D show an example of a table of reference antenna ports when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 2 in Rel. 15.

[0085] Figure 4A shows an example of a table of antenna ports corresponding to rank 1. In this example, values ​​from 0 to 13 in the antenna port field are associated with different sets of DMRS ports (1 antenna port). Note that the correspondence between values ​​and entry contents is not limited to this. Other examples are similar.

[0086] Figure 4B shows an example of a table of antenna ports corresponding to rank 2. In this example, each value from 0 to 9 in the antenna port field is associated with a different set of DMRS ports (2 antenna ports).

[0087] Figure 4C shows an example of a table of antenna ports corresponding to rank 3. In this example, values ​​from 0 to 2 in the antenna port field are associated with different sets of DMRS ports (3 antenna ports in total).

[0088] Figure 4D shows an example of a table of antenna ports corresponding to rank 4. In this example, values ​​from 0 to 3 in the antenna port field are associated with different sets of DMRS ports (4 antenna ports in total).

[0089] Figures 5A-5D show an example of a table of reference antenna ports when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 1 in Rel. 15.

[0090] Figure 5A shows an example of a table of antenna ports corresponding to rank 1. In this example, values ​​from 0 to 11 in the antenna port field are associated with different sets of DMRS ports (1 antenna port). Note that the correspondence between values ​​and entry contents is not limited to this. Other examples are similar.

[0091] Figure 5B shows an example of a table of antenna ports corresponding to rank 2. In this example, each value in the antenna port field from 0 to 6 is associated with a different set of DMRS ports (2 antenna ports).

[0092] Figure 5C shows an example of a table of antenna ports corresponding to rank 3. In this example, values ​​from 0 to 2 in the antenna port field are associated with different sets of DMRS ports (3 antenna ports in total).

[0093] Figure 5D shows an example of an antenna port table corresponding to rank 4. In this example, each value from 0 to 1 in the antenna port field corresponds to a different set of DMRS ports (4 antenna ports).

[0094] Figures 6A, 6B, 7A, and 7B show examples of reference antenna port tables for Rel.15 when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 2.

[0095] Figure 6A shows an example of a table of antenna ports corresponding to rank 1. In this example, each value in the antenna port field from 0 to 27 is associated with a different set of DMRS ports (1 antenna port).

[0096] Figure 6B shows an example of a table of antenna ports corresponding to rank 2. In this example, each value in the antenna port field from 0 to 18 is associated with a different set of DMRS ports (2 antenna ports).

[0097] Figure 7A shows an example of a table of antenna ports corresponding to rank 3. In this example, values ​​from 0 to 5 in the antenna port field are associated with different sets of DMRS ports (3 antenna ports).

[0098] Figure 7B shows an example of a table of antenna ports corresponding to rank 4. In this example, each value in the antenna port field from 0 to 4 is associated with a different set of DMRS ports (4 antenna ports).

[0099] <DMRS ports with more than 4 layers> This document provides an example of an antenna port table for DMRS port indication with more than 4 layers when the transform precoder is disabled.

[0100] For codebook-based pushes, the UE determines the rank (number of layers) for push transmission based on the DCI precoding information field. For non-codebook-based pushes, the UE determines the rank (number of layers) for push transmission based on the DCI SRS resource indicator field.

[0101] The UE may then determine the table of antenna ports corresponding to the determined rank based on the enabled / disabled transform precoder, the DMRS type of PUSCH set by upper-layer signaling (which may be set by the RRC parameter "dmrs-Type"), and the maximum length of the DMRS (which may be set by the RRC parameter "maxLength").

[0102] Additionally, the value of the DCI antenna port field may determine the entry in the referenced table (the entry corresponds to a set of values ​​such as the number of CDM groups without data, the DMRS antenna port index, and the number of front-load symbols).

[0103] [When DMRS type = 1 and DMRS maximum length = 1] If DMRS type=1 and DMRS maximum length=1, transmissions up to rank 4 may be supported. In other words, a UE configured with DMRS type=1 and DMRS maximum length=1 does not have to support transmissions greater than rank 4.

[0104] [When DMRS type = 1 and maximum DMRS length = 2] If DMRS type = 1 and DMRS maximum length = 2, transmission up to rank 8 may be supported.

[0105] Figures 8A-8D show an example table of reference antenna ports when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 2.

[0106] Figure 8A shows an example of a table of antenna ports corresponding to rank 5. In this example, values ​​from 0 to 3 in the antenna port field are associated with different sets of DMRS ports (5 antenna ports total). Note that the correspondence between values ​​and entry contents is not limited to this example. Other examples are similar.

[0107] In Figure 8A, 2+3 layers and 3+2 layers may be supported. Note that only a portion of the illustrated entries may be supported. For example, only the entries for DMRS ports 0-4 may be supported for the 2+3 layer, and only the entries for DMRS ports 0, 1, 2, 3, and 6 may be supported for the 3+2 layer.

[0108] Figure 8B shows an example of a table of antenna ports corresponding to rank 6. In this example, values ​​from 0 to 2 in the antenna port field are associated with different sets of DMRS ports (6 antenna ports in total).

[0109] In Figure 8B, 4+2 layers, 2+4 layers, and 3+3 layers may be supported. Furthermore, only specific X and Y combinations (e.g., 3+3) for the X+Y layer may be supported.

[0110] Figure 8C shows an example of an antenna port table corresponding to rank 7. In this example, each value from 0 to 1 in the antenna port field corresponds to a different set of DMRS ports (7 antenna ports in total).

[0111] In Figure 8C, 4+3 layers and 3+4 layers may be supported.

[0112] Figure 8D shows an example of a table of antenna ports corresponding to rank 8. In this example, a set of DMRS ports (8 antenna ports) is associated with the value of the antenna port field = 0.

[0113] In Figure 8D, only 4+4 layers may be supported.

[0114] [When DMRS type = 2 and DMRS maximum length = 1] If DMRS type = 2 and DMRS maximum length = 1, transmission up to rank 6 may be supported, or only transmission up to rank 4 may be supported, or transmission up to rank 5 may be supported but rank 6 (e.g., 4+2 layers) transmission is not supported.

[0115] Figures 9A and 9B show an example table of reference antenna ports when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 1.

[0116] Figure 9A shows an example of an antenna port table corresponding to rank 5. In this example, a set of DMRS ports (5 antenna ports) is associated with the value of the antenna port field = 0.

[0117] Figure 9B shows an example of an antenna port table corresponding to rank 6. In this example, a set of DMRS ports (6 antenna ports) is associated with the value of the antenna port field = 0.

[0118] [When DMRS type = 2 and DMRS maximum length = 2] If DMRS type = 2 and DMRS maximum length = 2, transmission up to rank 8 may be supported.

[0119] Figures 10A-10D show an example table of reference antenna ports when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 2.

[0120] Figure 10A shows an example of a table of antenna ports corresponding to rank 5. In this example, values ​​from 0 to 2 in the antenna port field are associated with different sets of DMRS ports (5 antenna ports in total).

[0121] Figure 10B shows an example of a table of antenna ports corresponding to rank 6. In this example, each value in the antenna port field from 0 to 3 corresponds to a different set of DMRS ports (6 antenna ports in total).

[0122] In Figure 10B, 4+2 layers, 2+4 layers, and 3+3 layers may be supported. Furthermore, only specific X and Y combinations (e.g., 3+3) for the X+Y layer may be supported. For example, only the entry corresponding to the value = 3 in the antenna port field of Figure 8B may be supported for 3+3.

[0123] Figure 10C shows an example of an antenna port table corresponding to rank 7. In this example, different sets of DMRS ports (7 antenna ports in total) are associated with values ​​from 0 to 2 in the antenna port field.

[0124] Figure 10D shows an example of an antenna port table corresponding to rank 8. In this example, a set of DMRS ports (8 antenna ports) is associated with values ​​of 0 to 2 in the antenna port field.

[0125] Regarding Figure 10D, only entries corresponding to 4+4 layers may be supported.

[0126] As explained above, the DMRS port instruction for a number of layers greater than 4 allows for the proper designation of antenna ports for PUSCH using a number of layers greater than 4 when the transform precoder is disabled.

[0127] As explained above, DMRS ports capable of supporting more than 4 layers are being considered for Rel.18 NR. In addition, increasing the number of orthogonal DMRS ports for PUSCH / PDSCH is being considered for Rel.18 NR. These new DMRS ports, which are different from existing DMRS ports (also called Rel.15 DMRS ports), are also called Rel.18 DMRS ports or extended DMRS ports.

[0128] The maximum number of ports for a DMRS type=1 and single-symbol DMRS may be increased from 4 for Rel.15 DMRS to 8 for Rel.18 DMRS.

[0129] The maximum number of ports for DMRS type=1 and double-symbol DMRS may be increased from 8 for Rel.15 DMRS to 16 for Rel.18 DMRS.

[0130] The maximum number of ports for DMRS type=2 and single-symbol DMRS may increase from 6 for Rel.15 DMRS to 12 for Rel.18 DMRS.

[0131] The maximum number of ports for DMRS type=2 and double-symbol DMRS may increase from 12 for Rel.15 DMRS to 24 for Rel.18 DMRS.

[0132] Such an increase in the number of DMRS ports may be achieved using at least one of the following: • FD-OCC extension: Use an OCC length greater than the OCC length of Rel.15 (=2) (e.g., 4, 6, etc.). • Extension of TD-OCC: Using TD-OCC across discontinuous DMRS symbols (e.g., TD-OCC across preceding / additional DMRS). • Sparse frequency allocation: Increase the number of CDM groups (e.g., increase the number of COM / FDMs). • Use TDM-enabled DMRS symbols: Use / reuse additional DMRS symbols to increase the number of orthogonal DMRS ports.

[0133] <New DMRS port index> Regarding PDSCH / PUSCH DMRS, a Rel.18 DMRS port may mean a port whose port number is at least one of the following (the port number for PDSCH DMRS is +1000): • Port number greater than 7 (for example, port numbers 8-15) (for DMRS configuration type 1), • Port number greater than 11 (e.g., port numbers 12-23) (for DMRS configuration type 2).

[0134] Figure 11 shows an example of parameters for DMRS configuration type 1 for Rel.18 DMRS. Figure 12 shows an example of parameters for DMRS configuration type 2 for Rel.18 DMRS. In Figures 11 and 12, the port number for PDSCH DMRS corresponds to port number + 1000. In Figures 11 and 12, the entries corresponding to the existing DMRS port index (0-7 for DMRS configuration type 1, 0-11 for DMRS configuration type 2) (including at least one of the CDM group, Δ, FD OCC, and TD OCC) do not need to be changed from the existing parameter correspondences (Figures 1 and 2).

[0135] In other words, Figure 11 is a table in which entries corresponding to Rel.18 DMRS ports (port numbers 8-15) have been added to the correspondence for DMRS configuration type 1 in Figure 1. Similarly, Figure 12 is a table in which entries corresponding to Rel.18 DMRS ports (port numbers 12-23) have been added to the correspondence for DMRS configuration type 2 in Figure 1.

[0136] In this example, the single-symbol DMRS may use port numbers 0-3 and 8-11 in Figure 11, or port numbers 0-5 and 12-17 in Figure 12.

[0137] Note that new FD OCC(w f (k')) may be defined. For example, for DMRS setting type 1 / DMRS setting type 2, an FD OCC of length 4 (k'=0-3) may be used. f The column (k') may show the OCC indices corresponding to the antenna ports (#0-#3 in the figure). Each OCC index may represent FD OCC sequences of the same / different lengths.

[0138] For example, w f (k'=#0 is {w f (0), w f (1), w f (2), w f(3) You can also show that {+1,+1,+1,+1}. f (k'=#1 is {w f (0), w f (1), w f (2), w f (3) You can also show that {+1, -1, +1, +1}. f (k'=#2 is {w f (0), w f (1), w f (2), w f (3) You can also show that {+1, +1, -1, -1}. f (k'=#3 is {w f (0), w f (1), w f (2), w f (3) You can also show that {+1, -1, -1, +1}.

[0139] The correspondence shown in Figures 11 and 12 simplifies the implementation of the UE / base station. Note that the Rel.18 DMRS port number, OCC index, etc., are not limited to the examples in Figures 11 and 12.

[0140] Starting with Rel.18, new FD-OCC lengths longer than 2 are supported. For example, Rel.18 eType1 / eType2 DMRS ports (e.g., rel.15 eType1 / eType2 DMRS ports) may be defined as DMRS ports with an FD-OCC length greater than 2 (e.g., DMRS ports with FD-OCC length > 2). For example, the FD-OCC length of a Rel.18 eType1 / eType2 DMRS port may be 4.

[0141] In the present disclosure, the Rel.15 / Rel.18 DMRS port numbers for PDSCH DMRS may correspond to the numbers obtained by adding 1000 to the Rel.15 / Rel.18 DMRS port numbers for PUSCH DMRS. In other words, the content regarding the Rel.15 / Rel.18 DMRS port numbers for PDSCH DMRS may be mutually read as the content regarding the Rel.15 / Rel.18 DMRS port numbers for PUSCH DMRS with the port numbers increased by 1000.

[0142] Note that the example shown in FIGS. 11-12 is an example of increasing the number of DMRS ports using the extension of FD-OCC, but the increase in the number of DMRS ports in the present disclosure is not limited to this. One or a combination of the above-described methods for increasing the number of DMRS ports may be applied. In that case, the correspondence relationship of the parameters corresponding to the antenna ports of the present disclosure may be different from that in FIGS. 11-12.

[0143] <Use of Rel.18 DMRS Ports for MU-MIMO / SU-MIMO> MU-MIMO between Rel.15 DMRS ports and Rel.18 DMRS ports may be allowed.

[0144] It is considered that there are no scheduling restrictions for MU-MIMO using different CDM groups, including MU-MIMO between Rel.15 UEs (UEs that cannot use Rel.18 DMRS ports) and Rel.18 UEs (UEs that can use Rel.18 DMRS ports).

[0145] Regarding MU-MIMO within one CDM group, it is considered that there are no scheduling restrictions for PUSCH either.

[0146] On the other hand, for MU-MIMO within a single CDM group, scheduling constraints are considered necessary for PDSCH to ensure orthogonality between DMRS ports. For example, PDSCH#1 to Rel.18 UE#A using Rel.15 DMRS port #1000 and PDSCH#2 to Rel.18 UE#B using Rel.18 DMRS port #1008 may be multiplexed using FD-OCC within a single CDM group and transmitted from the same base station.

[0147] The UE / base station may, based on the UE capability / RRC configuration, ensure that the UE decodes the FD-OCC for each of the four DMRS resource elements, for example (even if the Rel.18 DMRS port is not configured on the UE).

[0148] Dynamic switching based on DCI between Rel.15 DMRS ports and Rel.18 DMRS ports may also be supported. In this case, the table of antenna ports to be referenced may be specified by a new / existing field in the DCI (e.g., the antenna port field).

[0149] Quasi-static switching based on upper-layer signaling between Rel.15 DMRS ports and Rel.18 DMRS ports may be supported.

[0150] Incidentally, if FD OCCs of length 4 are supported, it is also conceivable that three or four DMRS ports within a CDM group may be directed to the UE (see Figure 13). Figure 13 shows the cases where FD-OCC#0, #1, and #2 are directed in CDM group #0 (3 layers), and where FD-OCC#0, #1, #2, and #3 are directed (4 layers).

[0151] If the case of directing four DMRS ports within a single CDM group to the UE is supported, for example, in the case of a single-symbol type 1 DMRS (e.g., eType1 DMRS), it is also conceivable that the DMRS ports of a four-rank CDM group #0 (e.g., {0,1,8,9}) would be directed.

[0152] In such cases, the question arises as to how to control the instructions for the DMRS ports newly supported in Rel.18 (for example, DMRS port 8 or higher for DMRS port type 1, and DMRS port 12 or higher for DMRS port type 2).

[0153] Therefore, the inventors investigated a method for instructing / setting the number of DMRS ports when the number of DMRS ports is expanded, and conceived one aspect of this embodiment.

[0154] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0155] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0156] In this disclosure, terms such as notice, activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0157] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, fields, Information Elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0158] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0159] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0160] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0161] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0162] In this disclosure, the terms used include: panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmit entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relationship, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups, resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pools, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumptions, etc., may be interpreted interchangeably.

[0163] In this disclosure, the notation "Rel.XX" refers to a 3GPP release. However, the release number "XX" is an example and may be replaced with other numbers.

[0164] In this disclosure, DMRS, DL DMRS, UL DMRS, PDSCH DMRS, and PUSCH DMRS may be interpreted as interchangeable.

[0165] In this disclosure, orthogonal sequences, OCC, FD OCC, and TD OCC may be interpreted as interchangeable.

[0166] In this disclosure, DMRS port, antenna port, port, and DMRS port index may be interpreted interchangeably. In this disclosure, DMRS CDM group, CDM group, DMRS group, DMRS CDM group(s) without data, etc., may be interpreted interchangeably. In this disclosure, antenna port indication and antenna port field may be interpreted interchangeably. In this disclosure, DMRS configuration type, DMRS type, and RRC parameter "dmrs-Type" may be interpreted interchangeably. In this disclosure, DMRS maximum length, DMRS maximum number of symbols, DMRS number of symbols, and RRC parameter "maxLength" may be interpreted interchangeably.

[0167] In this disclosure, DMRS type 1 (or DMRS type=1) may mean that the RRC parameter "dmrs-Type" is not set (for example, the RRC parameter "dmrs-Type" does not exist in the DMRS configuration (DMRS-DownlinkConfig information element / DMRS-UplinkConfig information element) (absent)), or it may mean that 1 (or type 1 (type1)) is set as the RRC parameter related to the DMRS type.

[0168] In this disclosure, DMRS maximum length = 1 may mean that the RRC parameter "maxLength" is not set (for example, the RRC parameter "maxLength" does not exist in the DMRS configuration (DMRS-DownlinkConfig information element / DMRS-UplinkConfig information element) (absent)), or it may mean that 1 (or length 1 (len1)) is set as the RRC parameter related to the maximum length of the DMRS.

[0169] In this disclosure, the terms CDM group list, port group list, and list may be interpreted interchangeably. In this disclosure, the terms CDM group subset, port group subset, and group subset may be interpreted interchangeably.

[0170] In this disclosure, rank, transmission rank, number of layers, and number of antenna ports may be interpreted interchangeably. Furthermore, the application of one codeword and the number of layers being four or less may be interpreted interchangeably. The application of two codewords and the number of layers being greater than four may be interpreted interchangeably.

[0171] In this disclosure, "to configure transform precoding" may be interpreted as "to enable transform precoding."

[0172] In this disclosure, "having the ability to..." may be interpreted as "supporting / reporting the ability to...".

[0173] In this disclosure, a table may be interpreted as one or more tables.

[0174] Furthermore, in the following embodiments, DCI may mean a DCI that schedules at least one of PUSCH and PDSCH (for example, DCI formats 0_x, 1_x (where x is an integer)).

[0175] The following embodiments illustrate, but are not limited to, the representation of Rel.18 DMRS ports using a new DMRS port index. For example, embodiments of this disclosure may apply when representing Rel.18 DMRS ports using a subset of port groups.

[0176] (Wireless communication method) <Embodiment #0A> Embodiment #0A relates to a PUSCH DMRS.

[0177] In Embodiment #0A, the UE may use a combination of the Rel.15 DMRS port and the Rel.18 DMRS port of the single-symbol DMRS for PUSCH transmissions of rank 5 or higher.

[0178] For DMRS type 1, the UE may specify the following combinations of DMRS ports by the antenna port field: Regarding rank 8, the combinations of port indices #0, #1, #2, #3, #8, #9, #10 and #11, Regarding rank 7, a combination of 7 indices from port indices #0, #1, #2, #3, #8, #9, #10, and #11 (for example, #0, #1, #2, #3, #8, #9, #10), Regarding rank 6, a combination of six indices from port indices #0, #1, #2, #3, #8, #9, #10, and #11 (for example, #0, #1, #2, #3, #8, #9), • For rank 5, a combination of five indexes from port indexes #0, #1, #2, #3, #8, #9, #10, and #11 (for example, #0, #1, #2, #3, #8).

[0179] For DMRS type 2, the UE may specify the following combinations of DMRS ports by the antenna port field: Regarding rank 8, a combination of eight indices from port indices #0, #1, #2, #3, #4, #5, #12, #13, #14, #15, #16, and #17 (for example, #0, #1, #2, #3, #4, #5, #12, #13), Regarding rank 7, a combination of 7 indices from port indices #0, #1, #2, #3, #4, #5, #12, #13, #14, #15, #16, and #17 (for example, #0, #1, #2, #3, #4, #5, #12), Regarding rank 6, a combination of six indices from port indices #0, #1, #2, #3, #4, #5, #12, #13, #14, #15, #16, and #17 (for example, #0, #1, #2, #3, #4, #5), • For rank 5, a combination of 5 indices from port indices #0, #1, #2, #3, #4, #5, #12, #13, #14, #15, #16, and #17 (for example, #0, #1, #2, #3, #4).

[0180] The following is an example of an antenna port table for PUSCH DMRS port indication (hereinafter also referred to as the antenna port indication table, DMRS port indication table, DMRS port table, etc.). Note that the UE may decide which antenna port indication table to refer to based on the rank value determined based on the precoding information field / SRI field, the DMRS type, and the maximum length of the DMRS.

[0181] The UE may receive a DCI related to PUSCH that includes an antenna port field (antenna port indicator) and control the transmission (such as mapping) of DMRS / PUSCH based on the value of the field and the antenna port indicator table that it has decided to refer to.

[0182] Figure 14 shows an example of a reference antenna port instruction table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 5. The values ​​(Value) = 0-3 in the antenna port field correspond to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {4, 1}, {3, 2}, {2, 3}, and {1, 4}, respectively.

[0183] The illustrated table may be referenced by the UE when Rel.18 DMRS (or Rel.18 DMRS activation / Rel.18 DMRS port activation) is configured. Furthermore, multiple entries (rows in the table) indicating the same {Number of Rel.15 DMRS ports, Number of Rel.18 DMRS ports} may be specified, only some of the illustrated entries may be specified, or a different combination of port indexes than the illustrated combination may be specified (the same applies to subsequent diagrams relating to the antenna port instruction table).

[0184] Figure 15 shows an example of a reference antenna port instruction table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 6. The values ​​(Value) = 0-2 in the antenna port field correspond to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {4, 2}, {3, 3}, and {2, 4}, respectively.

[0185] Figure 16 shows an example of a reference antenna port instruction table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 7. The values ​​(Value) = 0-1 in the antenna port field correspond to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {4, 3} and {3, 4}, respectively.

[0186] Figure 17 shows an example of a reference antenna port instruction table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 1, DMRS maximum length = 1, and rank = 8. A value of 0 in the antenna port field corresponds to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {4, 4}.

[0187] Figure 18 shows an example of a reference antenna port instruction table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 5. The values ​​(Value) of the antenna port field = 0, 1-2, 3-4, 5-7, 7-8, and 9 correspond to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {5, 0}, {4, 1}, {3, 2}, {2, 3}, {1, 4}, and {0, 5}, respectively.

[0188] Note that the DMRS ports corresponding to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {5, 0}, {0, 5} shown in the diagram utilize all of CDM groups #0-#2 (as can be seen from Figure 12), so the number of CDM groups is 3.

[0189] Furthermore, the DMRS ports corresponding to the illustrated {Rel.15 Number of DMRS Ports, Rel.18 Number of DMRS Ports} = {4, 1}, {3, 2}, {2, 3}, {1, 4} utilize two of the CDM groups #0-#2 (as can be seen from Figure 12), so the number of CDM groups is 2 or 3. When the number of CDM groups is 2, the UE can send a PUSCH in the resource element corresponding to the remaining CDM group in the DMRS symbol (it can map a block of complex numerical symbols (generated by encoding data, etc.) to the specified DMRS port (port for sending PUSCH)), which can lead to increased communication throughput or a reduction in the PUSCH error rate due to a decrease in the coding rate.

[0190] Furthermore, if there are three CDM groups, other UEs can use the remaining CDM group to perform DMRS / PUSCH transmissions, which is expected to improve system utilization efficiency.

[0191] Thus, by adopting a table like the one shown in Figure 18, it is possible to specify different numbers of CDM groups for the same {Rel.15 DMRS port count, Rel.18 DMRS port count} pair (or the same combination of DMRS ports) to the UE, enabling flexible control that takes into account the traffic of each UE.

[0192] Figure 19 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 6.

[0193] Figure 20 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 7.

[0194] Figure 21 shows an example of a reference antenna port indication table according to Embodiment #0A, where the transform precoder is disabled, DMRS type = 2, DMRS maximum length = 1, and rank = 8.

[0195] According to Embodiment #0A described above, PUSCH transmissions of rank 5 or higher can be performed based on single-symbol DMRS, thus reducing the communication overhead associated with DMRS compared to the case based on double-symbol DMRS. Furthermore, by using an antenna port instruction table with a maximum DMRS length of 1, the size of the DCI antenna port field can be reduced compared to the case where the maximum DMRS length is 2 (for example, the table in Figures 8A-8D), thus reducing the communication overhead associated with the antenna port field.

[0196] <Embodiment #0B> Embodiment #0B relates to PDSCH DMRS.

[0197] In Embodiment #0B, the UE may use a combination of the Rel.15 DMRS port and the Rel.18 DMRS port of the single-symbol DMRS for PDSCH transmission of rank 5 or higher.

[0198] For DMRS type 1, the UE may specify the following combinations of DMRS ports by the antenna port field: Regarding rank 8, the combinations of port indices #1000, #1001, #1002, #1003, #1008, #1009, #1010 and #1011, Regarding rank 7, a combination of seven indexes from port indexes #1000, #1001, #1002, #1003, #1008, #1009, #1010, and #1011 (for example, #1000, #1001, #1002, #1003, #1008, #1009, #1010), Regarding rank 6, a combination of six indexes from port indexes #1000, #1001, #1002, #1003, #1008, #1009, #1010, and #1011 (for example, #1000, #1001, #1002, #1003, #1008, #1009), • For rank 5, a combination of five indexes from port indexes #1000, #1001, #1002, #1003, #1008, #1009, #1010, and #1011 (for example, #1000, #1001, #1002, #1003, #1008).

[0199] For DMRS type 2, the UE may specify the following combinations of DMRS ports by the antenna port field: Regarding rank 8, a combination of eight indexes from port indexes #1000, #1001, #1002, #1003, #1004, #1005, #1012, #1013, #1014, #1015, #1016, and #1017 (for example, #1000, #1001, #1002, #1003, #1004, #1005, #1012, #1013), Regarding rank 7, a combination of 7 indexes from port indexes #1000, #1001, #1002, #1003, #1004, #1005, #1012, #1013, #1014, #1015, #1016, and #1017 (for example, #1000, #1001, #1002, #1003, #1004, #1005, #1012), Regarding rank 6, a combination of six indexes from port indexes #1000, #1001, #1002, #1003, #1004, #1005, #1012, #1013, #1014, #1015, #1016, and #1017 (for example, #1000, #1001, #1002, #1003, #1004, #1005), • For rank 5, a combination of five indexes from port indexes #1000, #1001, #1002, #1003, #1004, #1005, #1012, #1013, #1014, #1015, #1016, and #1017 (for example, #1000, #1001, #1002, #1003, #1004).

[0200] The following is an example of an antenna port instruction table for PDSCH DMRS port instruction. Note that the UE may decide which antenna port instruction table to refer to based on the DMRS type, maximum DMRS length, etc.

[0201] The UE may receive a DCI related to the PDSCH, which includes an antenna port field (antenna port indicator), and control the reception (such as demapping) of the DMRS / PDSCH based on the value of the field and the antenna port indicator table that it has decided to refer to.

[0202] Figure 22 shows an example of a reference antenna port indication table according to Embodiment #0B, where DMRS type = 1 and DMRS maximum length = 1.

[0203] Note that the left side of the table corresponds to 4 layers or less and is referenced when a PDSCH for one codeword is scheduled. The left side of the table corresponds to 5 layers or more and is referenced when a PDSCH for two codewords is scheduled. Also, the PDSCH DMRS port number actually corresponds to the value shown in the diagram plus 1000 (the same applies to the subsequent diagrams of the PDSCH DMRS antenna port indication table).

[0204] In the table in Figure 22, the values ​​(Value) = 0-3 in the Antenna Port field for the two codeword cases correspond to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {4, 1}, {4, 2}, {4, 3}, and {4, 4} (i.e., layers 5-8, respectively).

[0205] Furthermore, the UE may be configured by the base station to have information about the maximum number of codewords that can be scheduled by DCI (e.g., the RRC parameter maxNrofCodeWordsScheduledByDCI), and may decide to refer to the right side of the antenna port instruction table if this information is greater than 1 and the DCI includes several specific fields (e.g., the MCS field).

[0206] Figure 23 shows an example of a reference antenna port indication table for Embodiment #0B, where DMRS type = 1 and DMRS maximum length = 1. The antenna port indication table in Figure 23 is used when the UE receives an activation command that maps at least one code point in the Transmission Configuration Indication (TCI) field included in the DCI to two TCI states. In other words, Figure 23 is a table for supporting a different combination of layers across different TRPs than in Figure 22 (for example, TRP1# to layer 1 and TRP#2 to layer 2, corresponding to value = 12) in a single DCI multi-TRP.

[0207] The entries in the table in Figure 23 for two codewords are the same as the entries in the table in Figure 22 for two codewords, but are not limited to this. For example, while the value = 2 in the table in Figure 23 for two codewords could correspond to layers 4 from TRP#1 and layers 3 from TRP#2, entries indicating different layer combinations may also be defined for the same total of seven layers.

[0208] Furthermore, ports (port numbers) may be associated with TRPs, or CDM groups (CDM group indexes) may be associated with TRPs. The association (correspondence) between port numbers / CDM group indexes and TRPs may be defined in advance in the standard, or it may be set in the UE by upper-layer signaling / physical-layer signaling.

[0209] Assuming that ports #1000-#1003 correspond to TRP#1 and ports #1008-#1011 correspond to TRP#2, for example, entries may be defined for DMRS ports relating to layer 7, including at least one such as "0-3, 8-10" (layers 4 from TRP#1 + layer 3 from TRP#2) and "0-2, 8-11" (layers 3 from TRP#1 + layer 4 from TRP#2).

[0210] Furthermore, assuming that CDM group #0 corresponds to TRP #1 and CDM group #1 corresponds to TRP #2, entries may be defined for DMRS ports related to Layer 7 that include at least one of the following: "0-3, 8-10" (4 layers from TRP #1 + 3 layers from TRP #2), "0-2, 8-11" (4 layers from TRP #1 + 3 layers from TRP #2), "0-3, 8, 10-11" (3 layers from TRP #1 + 4 layers from TRP #2), "0, 2-3, 8-11" (3 layers from TRP #1 + 4 layers from TRP #2).

[0211] Similarly, entries indicating other combinations of layers may be specified for entries with other numbers of layers.

[0212] In Embodiment #0B, the maximum number of layers per TRP (or codeword) may be set / specified. For example, the maximum number of layers per TRP (or codeword) may be 4. The UE may expect that the number of layers for each TRP derived from the configuration of the DMRS ports included in the antenna port designation table does not exceed the maximum number of layers per TRP (or codeword).

[0213] Figure 24 shows an example of a reference antenna port indication table for Embodiment #0B, where DMRS type = 2 and DMRS maximum length = 1.

[0214] In the table in Figure 24, the values ​​of the antenna port field (Value) = 0-3 for the two codewords correspond to {Rel.15 DMRS port count, Rel.18 DMRS port count} = {5, 0}, {6, 0}, {6, 1}, and {6, 2} (i.e., layers 5-8, respectively).

[0215] Figure 25 shows an example of a reference antenna port instruction table for Embodiment #0B, where DMRS type = 2 and DMRS maximum length = 1. The antenna port instruction table in Figure 25 is used when the UE receives an activation command that maps at least one code point of the TCI field included in the DCI to two TCI states, similar to Figure 23.

[0216] The entries in the table in Figure 25 for two codewords are the same as the entries in the table in Figure 24 for two codewords, but are not limited to this. For example, the value = 2 for two codewords in the table in Figure 25 could correspond to five layers from TRP#1 (e.g., ports #1000-#1004) and two layers from TRP#2 (e.g., ports #1005, #1012), but entries indicating different layer combinations may be defined for the same total of seven layers.

[0217] Ports may be associated with TRPs, or CDM groups may be associated with TRPs.

[0218] Assuming that ports #1000-#1005 correspond to TRP#1 and ports #1012-#1017 correspond to TRP#2, for example, entries may be defined for DMRS ports relating to 7 layers, including at least one of the following: "0-5, 12" (6 layers from TRP#1 + 1 layer from TRP#2), "0-4, 12-13" (5 layers from TRP#1 + 2 layers from TRP#2), "0-3, 12-14" (4 layers from TRP#1 + 3 layers from TRP#2), "0-2, 12-15" (3 layers from TRP#1 + 4 layers from TRP#2), "0-1, 12-16" (2 layers from TRP#1 + 5 layers from TRP#2), "0, 12-17" (1 layer from TRP#1 + 6 layers from TRP#2).

[0219] Assuming that CDM groups #0 and #2 correspond to TRP #1, and CDM group #1 corresponds to TRP #2, then entries may be defined as DMRS ports that include at least one of the following: "0-5, 12" (5 layers from TRP #1 + 2 layers from TRP #2), "0-4, 12-13" (5 layers from TRP #1 + 2 layers from TRP #2), "0-3, 12-14" (4 layers from TRP #1 + 3 layers from TRP #2), "0-2, 12-15" (4 layers from TRP #1 + 3 layers from TRP #2), "0-1, 12-16" (5 layers from TRP #1 + 2 layers from TRP #2), "0-4, 12, 14-15" (3 layers from TRP #1 + 4 layers from TRP #2). Assuming that CDM group #0 corresponds to TRP #1, and CDM groups #1 and #2 correspond to TRP #2, for example, an entry may be specified for the DMRS port that includes at least one such entry, such as “0-5, 14” (2 layers from TRP #1 + 5 layers from TRP #2). Similarly, entries indicating other combinations of layers may be specified for entries with other numbers of layers.

[0220] Similarly, entries indicating other combinations of layers may be specified for entries with other numbers of layers.

[0221] In the case of the two codewords in the table in Figure 25, only the number of CDM groups = 3 is shown, but as shown in Embodiment #0A, an entry indicating the number of CDM groups = 2 may also be specified. For example, for a 5-layer, the number of CDM groups corresponding to DMRS ports "0-3, 12" may be 2 or 3. Also, for a 6-layer, the number of CDM groups corresponding to DMRS ports "0-3, 12-13" may be 2 or 3.

[0222] When there are two CDM groups, the UE can receive the PDSCH in the resource element corresponding to the remaining CDM group in the DMRS symbol (it can process the reception assuming that a block of complex-valued symbols (generated by encoding data, etc.) is mapped to the specified DMRS port (port for receiving PDSCH)). This can lead to increased communication throughput or a reduction in the PDSCH error rate due to a decrease in the coding rate.

[0223] Furthermore, if there are three CDM groups, other UEs can use the remaining CDM group to receive DMRS / PUSCH signals, which is expected to improve system utilization efficiency.

[0224] Thus, when it is possible to specify different numbers of CDM groups for the same set of {Rel.15 DMRS port count, Rel.18 DMRS port count} (or the same combination of DMRS ports) to the UE, flexible control is possible that takes into account the traffic of each UE.

[0225] According to Embodiment #0B described above, PDSCH transmission of rank 5 or higher can be performed based on single-symbol DMRS, thus reducing the communication overhead associated with DMRS compared to the case based on double-symbol DMRS. Furthermore, by using an antenna port instruction table with a maximum DMRS length of 1, the size of the DCI antenna port field can be reduced compared to the case where the maximum DMRS length is 2, thus reducing the communication overhead associated with the antenna port field.

[0226] <Embodiment #1> Embodiment #1 describes a case where more than two PDSCH DMRS ports (e.g., three or four DMRS ports) are supported within the same CDM group. Here, the case where the maximum length of the DMRS for the PDSCH is 1 (e.g., maxLength=1) is used as an example. Embodiment #1 may be applied independently of Embodiments #0A / 0B or in combination with them.

[0227] The UE may determine the DMRS port (or combination of DMRS ports) of the PDSCH by a field related to the antenna port included in the DCI used for scheduling the PDSCH (e.g., the antenna port field). An association (e.g., an antenna port reference table) may be defined between the value (or code point, bit value) of the antenna port field and one or more DMRS port numbers.

[0228] In this case, the value of the antenna port field may indicate a combination of more than two DMRS ports (e.g., three or four DMRS ports) within a single DMRS CDM group. This allows for instructing a UE to use up to four DMRS ports within one CDM group, including DMRS ports supported from Rel. 18 onwards. As a result, inter-UE multiplexing can be performed more efficiently by a separate CDM group.

[0229] Figure 26 shows an example of an antenna port assignment table that can assign up to four DMRS ports within a single CDM group (or the same CDM group). Figure 26 may also be referenced when DMRS type = 1 and DMRS maximum length = 1 (when DMRS +Rel.18 or later is supported / configured). For conditions such as the CDM group number corresponding to each DMRS port number, refer to Figure 11. Note that the DMRS port number of PDSCH corresponds to the DMRS port number shown in Figure 26 plus 1000.

[0230] Figure 26 shows a case where three or four DMRS ports are indicated within a single CDM group when the antenna port field included in the DCI has a specific value (here, a Value of 12-15). For example, one or more candidates / cases in which three or four DMRS ports are indicated within a single CDM group may be supported using a specific value.

[0231] Specifically, when the value is 12, DMRS ports 0, 1, 8 (3 layers) corresponding to CDM group #0 are indicated; when the value is 13, DMRS ports 0, 1, 8, 9 (4 layers) corresponding to CDM group #0 are indicated. Also, when the value is 14, DMRS ports 2, 3, 10 (3 layers) corresponding to CDM group #1 are indicated; when the value is 15, DMRS ports 2, 3, 10, 11 (4 layers) corresponding to CDM group #1 are indicated. Of course, specific values are not limited to this.

[0232] Figure 26 shows a case of supporting the indication of 3 or 4 DMRS ports to the UE within one CDM group by expanding / using reserved bits (e.g., Reserved) in the antenna port indication table referred to when DMRS type = 1 and the maximum length of DMRS = 1 as shown in Figure 22 above. Note that the figure shown in Figure 26 is an example, and the values indicating 3 or 4 DMRS ports within one CDM group, combinations of DMRS ports, etc. are not limited to this.

[0233] Figure 27 is a diagram showing an example of an antenna port indication table capable of indicating up to 4 DMRS ports within one CDM group (or the same CDM group). Also, Figure 27 may be referred to when DMRS type = 2 and the maximum length of DMRS = 1 (+ when DMRS after Rel. 18 is supported / configured). Conditions such as the CDM group number corresponding to each DMRS port number may refer to Figure 12. Note that the DMRS port number of PDSCH corresponds to the value obtained by adding 1000 to the DMRS port number shown in Figure 27.

[0234] Figure 27 shows a case where 3 or 4 DMRS ports are indicated within one CDM group when the antenna port field included in DCI has a specific value (here, the value (Value) is 24 - 29). For example, one or more candidates / cases where 3 or 4 DMRS ports are indicated within one CDM group using specific values may be supported.

[0235] Specifically, when the value is 24, the DMRS ports 0, 1, 12 (3 layers) corresponding to CDM group #0 are indicated. When the value is 25, the DMRS ports 0, 1, 12, 13 (4 layers) corresponding to CDM group #0 are indicated. Also, when the value is 26, the DMRS ports 2, 3, 14 (3 layers) corresponding to CDM group #1 are indicated. When the value is 27, the DMRS ports 2, 3, 14, 15 (4 layers) corresponding to CDM group #1 are indicated. Also, when the value is 28, the DMRS ports 4, 5, 16 (3 layers) corresponding to CDM group #2 are indicated. When the value is 29, the DMRS ports 4, 5, 16, 17 (4 layers) corresponding to CDM group #2 are indicated.

[0236] In addition, in Figure 27, the values 30 and 31 indicate another value (here, 2) as the number of DMRS CDM groups without data, but the DMRS ports / number of CDM groups to be indicated are not limited to this. Alternatively, the values 30 and 31 may be defined as reserved bits.

[0237] Figure 27 shows a case of supporting the indication of 3 or 4 DMRS ports to the UE within one CDM group by expanding / using the reserved bits (e.g., Reserved) of the antenna port indication table referred to in the case where DMRS type = 2 and the maximum length of DMRS = 1 shown in Figure 23 above. Note that the figure shown in Figure 27 is an example, and the values indicating 3 or 4 DMRS ports within one CDM group, the combinations of DMRS ports, etc. are not limited to this.

[0238] In Figures 26 and 27, the same DCI size (or the antenna port field size of DCI) as in the case of using the antenna port indication table of the existing system (e.g., Rel.17) is used to utilize the reserved bits of the antenna port indication table. Thereby, 3 or 4 DMRS ports within one CDM group can be indicated to the UE without increasing the size of DCI (or the antenna port field size of DCI).

[0239] Alternatively, the size of the DCI (or the antenna port field size of the DCI) can be increased to provide more value / code points (or rows in the antenna port indication table) that can indicate three or four DMRS ports within a single CDM group. In this case, the UE can be more flexibly instructed on the combination of DMRS ports.

[0240] Figures 26 and 27 show cases with four layers or less (e.g., one codeword), but are not limited to this. Cases with more than four layers (e.g., two codewords) may also be similarly applicable. For example, in the case of two codewords (rank > 4), reserved bits or rows in the existing system's antenna port instruction table may be extended / updated to support instruction for three or more DMRS ports within the same CDM group.

[0241] <Embodiment #2> Embodiment #2 describes a case where more than two PDSCH DMRS ports (e.g., three or four DMRS ports) are supported within the same CDM group. Here, the case where the maximum length of the DMRS for PUSCH is 1 (e.g., maxLength=1) is used as an example. Embodiment #2 may be applied independently of Embodiments #0A / 0B / #1 or in combination with them.

[0242] The UE may determine the DMRS port (or combination of DMRS ports) of the PUSCH by a field related to the antenna port included in the DCI used to schedule the PUSCH (e.g., the antenna port field). An association (e.g., an antenna port reference table) may be defined between the value (or code point, bit value) of the antenna port field and one or more DMRS port numbers.

[0243] In this case, the value of the antenna port field may indicate a combination of more than two DMRS ports (e.g., three or four DMRS ports) within a single DMRS CDM group. This allows for instructing a UE to use up to four DMRS ports within one CDM group, including DMRS ports supported from Rel. 18 onwards. As a result, inter-UE multiplexing can be performed more efficiently by a separate CDM group.

[0244] Furthermore, when a PUSCH DMRS port is assigned a rank higher than a certain rank, the instruction of more than two DMRS ports within a single CDM group may be supported. The specific rank may be two, in which case, when the rank is higher than two (e.g., ranks 3 and 4), the instruction of three or four DMRS ports within a single CDM group may be supported.

[0245] Figure 28 shows an example of an antenna port assignment table that can assign up to four DMRS ports within a single CDM group (or the same CDM group). Figure 28 may also be referenced when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 1. Tables corresponding to specific ranks (e.g., rank 3 / 4) may be referenced if DMRS Rel. 18 or later is supported / configured. For conditions such as the CDM group number corresponding to each DMRS port number, see Figure 11.

[0246] Figure 28 shows a case where, for a specific rank (e.g., a rank greater than 2 or a rank greater than 3), three or four DMRS ports are indicated within a single CDM group when the antenna port field included in the DCI has a specific value (here, a Value of 1-2). The rank may be indicated to the UE by the DCI, or it may be obtained by the UE from the value indicated in the DCI.

[0247] Specifically, in rank 3, a value of 1 indicates DMRS ports 0, 1, and 8 (3-layer) corresponding to CDM group #0, and a value of 2 indicates DMRS ports 2, 3, and 10 (3-layer) corresponding to CDM group #1. Similarly, in rank 4, a value of 1 indicates DMRS ports 0, 1, 8, and 9 (4-layer) corresponding to CDM group #0, and a value of 2 indicates DMRS ports 2, 3, 10, and 11 (4-layer) corresponding to CDM group #1. Of course, these are not the only possible values.

[0248] Figure 28 shows a case where the reserved bits (e.g., Reserved) in the antenna port instruction table referenced when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 1 are extended / utilized to support instructing the UE to 3 or 4 DMRS ports within a single CDM group. Note that the diagram in Figure 28 is an example, and the values ​​and combinations of DMRS ports that indicate 3 or 4 DMRS ports within a single CDM group are not limited to this.

[0249] Figure 29 shows an example of an antenna port assignment table that can assign up to four DMRS ports within a single CDM group (or the same CDM group). Figure 29 may also be referenced when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 1. Tables corresponding to specific ranks (e.g., rank 3 / 4) may be referenced if DMRS Rel. 18 or later is supported / configured. For conditions such as the CDM group number corresponding to each DMRS port number, see Figure 12.

[0250] Figure 29 shows a case where, for a specific rank (e.g., a rank greater than 2 or a rank of 3 or greater), three or four DMRS ports are indicated within a single CDM group when the antenna port field included in the DCI has a specific value (here, a Value of 3-5 for rank 3, and a Value of 2-4 for rank 4). The rank may be indicated to the UE by the DCI, or the UE may obtain it from the value indicated in the DCI.

[0251] Specifically, in rank 3, a value of 3 indicates DMRS ports 0, 1, and 12 (3-layer) corresponding to CDM group #0; a value of 4 indicates DMRS ports 2, 3, and 14 (3-layer) corresponding to CDM group #1; and a value of 5 indicates DMRS ports 4, 5, and 16 (3-layer) corresponding to CDM group #2. Furthermore, in rank 4, a value of 2 indicates DMRS ports 0, 1, 12, and 13 (4-layer) corresponding to CDM group #0; a value of 3 indicates DMRS ports 2, 3, 14, and 15 (4-layer) corresponding to CDM group #1; and a value of 4 indicates DMRS ports 4, 5, 16, and 17 (4-layer) corresponding to CDM group #2. Of course, specific values ​​are not limited to these.

[0252] Figure 29 shows a case where the reserved bits (e.g., Reserved) in the antenna port instruction table referenced when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 1 are extended / utilized to support instructing the UE to 3 or 4 DMRS ports within a single CDM group. Note that the diagram in Figure 29 is an example, and the values ​​and combinations of DMRS ports that indicate 3 or 4 DMRS ports within a single CDM group are not limited to this.

[0253] In FIGS. 28 and 29, the reserved bits of the antenna port indication table are used while using the same DCI size (or the antenna port field size of DCI) as when using the antenna port indication table of an existing system (e.g., Rel. 17). Thereby, it is possible to indicate 3 or 4 DMRS ports to the UE within one CDM group without increasing the size of DCI (or the antenna port field size of DCI).

[0254] Alternatively, the size of DCI (or the antenna port field size of DCI) may be increased to increase the values / codepoints (or the rows of the antenna port indication table) that can indicate 3 or 4 DMRS ports within one CDM group. In this case, the combination of DMRS ports can be flexibly indicated to the UE.

[0255] In FIGS. 28 and 29, the case of 4 layers or less (e.g., the case of 1 codeword) is shown, but it is not limited thereto. The case of more than 4 layers (e.g., the case of 2 codewords) may be similarly applied. For example, in the case of 2 codewords (rank > 4), the reserved bits or the rows of the antenna port indication table of the existing system may be extended / updated to support the indication of 3 or more DMRS ports within the same CDM group.

[0256] <Embodiment #3> Embodiment #3 will describe the case where the indication of more than 2 PDSCH DMRS ports (e.g., 3 or 4 DMRS ports) within the same CDM group is supported. Here, the case where the maximum length of DMRS for PDSCH is 2 (e.g., maxLength = 2) will be described as an example. Embodiment #3 may be applied independently of or in combination with Embodiment #0A / 0B / 1 / 2.

[0257] The UE may determine the DMRS port (or combination of DMRS ports) of the PDSCH by a field related to the antenna port included in the DCI used for scheduling the PDSCH (e.g., the antenna port field). An association (e.g., an antenna port reference table) may be defined between the value (or code point, bit value) of the antenna port field and one or more DMRS port numbers.

[0258] In this case, the value of the antenna port field may indicate a combination of more than two DMRS ports (e.g., three or four DMRS ports) within a single DMRS CDM group. When the maximum length of a DMRS is 2 (e.g., maxLength=2), allowing the indication of more than two DMRS ports within a single DMRS CDM group can reduce the actual number of DMRS symbols used (e.g., Number of front-load symbols). This reduces DMRS overhead.

[0259] Figure 30 shows an example of an antenna port assignment table that can assign up to 4 DMRS ports within a single CDM group (or the same CDM group). Figure 30 may also be referenced when DMRS type = 1 and maximum DMRS length = 2 (when DMRS +Rel.18 or later is supported / configured). For conditions such as the CDM group number corresponding to each DMRS port number, refer to Figure 11. Note that the DMRS port number of PDSCH corresponds to the DMRS port number shown in Figure 30 plus 1000.

[0260] Figure 30 shows a case where three or four DMRS ports are indicated within a single CDM group when the antenna port field included in the DCI has a specific value (here, Value is 31). For example, one or more candidate / cases in which three or four DMRS ports are indicated within a single CDM group may be supported using a specific value.

[0261] For example, specific values ​​may be used to specify DMRS ports 0, 1, and 8 (3-layer) corresponding to CDM group #0. Alternatively, specific values ​​may be used to specify DMRS ports 0, 1, 8, and 9 (4-layer) corresponding to CDM group #0. Alternatively, specific values ​​may be used to specify DMRS ports 2, 3, and 10 (3-layer) corresponding to CDM group #1. Alternatively, specific values ​​may be used to specify DMRS ports 2, 3, 10, and 11 (4-layer) corresponding to CDM group #1. Note that the diagram shown in Figure 30 is just an example, and the values ​​and combinations of DMRS ports that specify 3 or 4 DMRS ports within a single CDM group are not limited to this.

[0262] Figure 30 shows a case where the reserved bits (e.g., Reserved) in the antenna port instruction table referenced when DMRS type = 1 and DMRS maximum length = 2 are extended / utilized to support instructing the UE to 3 or 4 DMRS ports within a single CDM group. For cases with fewer reserved bits (in this case, one), the base station may configure which of the four candidates / cases shown in Figure 30 to apply using higher-layer signaling or the like.

[0263] Alternatively, to support the indication of four candidates / cases, the antenna port field (and the values ​​in the antenna port indication table) included in the DCI may be added / extended. For example, a predetermined bit (e.g., 1 bit) may be added to the antenna port field of DCI format 1_1 / 1_2 used for scheduling PDSCH.

[0264] Figure 31 shows an example of an antenna port assignment table that can assign up to four DMRS ports within a single CDM group (or the same CDM group). Figure 31 may also be referenced when DMRS type = 2 and maximum DMRS length = 2 (when DMRS +Rel.18 or later is supported / configured). For conditions such as the CDM group number corresponding to each DMRS port number, refer to Figure 12. Note that the DMRS port number of the PDSCH corresponds to the DMRS port number shown in Figure 31 plus 1000.

[0265] Figure 31 shows a case where three or four DMRS ports are indicated within a single CDM group when the antenna port field included in the DCI has a specific value (here, a Value of 58-63). For example, one or more candidates / cases in which three or four DMRS ports are indicated within a single CDM group may be supported using a specific value.

[0266] Specifically, a value of 58 indicates DMRS ports 0, 1, and 12 (3-layer) corresponding to CDM group #0, and a value of 59 indicates DMRS ports 0, 1, 12, and 13 (4-layer) corresponding to CDM group #0. Furthermore, a value of 60 indicates DMRS ports 2, 3, and 14 (3-layer) corresponding to CDM group #1, and a value of 61 indicates DMRS ports 2, 3, 14, and 15 (4-layer) corresponding to CDM group #1. Additionally, a value of 62 indicates DMRS ports 4, 5, and 16 (3-layer) corresponding to CDM group #2, and a value of 63 indicates DMRS ports 4, 5, 16, and 17 (4-layer) corresponding to CDM group #2.

[0267] Note that the diagram shown in Figure 31 is just an example, and the values ​​and combinations of DMRS ports that can be specified within a single CDM group (e.g., 3 or 4) are not limited to this. Furthermore, some of the six candidates / cases shown in Figure 31 may be defined / configured, or the UE may set which candidate / case is applied using higher-layer parameters.

[0268] Figure 31 shows a case where the reserved bits (e.g., Reserved) in the antenna port instruction table referenced when DMRS type = 2 and DMRS maximum length = 2 are extended / utilized to support instructing the UE to 3 or 4 DMRS ports within a single CDM group. Note that the diagram in Figure 31 is an example, and the values ​​for instructing 3 or 4 DMRS ports within a single CDM group, the combinations of DMRS ports, etc., are not limited to this.

[0269] Figures 30 and 31 utilize the reserved bits of the antenna port instruction table, using the same DCI size (or DCI antenna port field size) as when using the antenna port instruction table of an existing system (e.g., Rel. 17). This allows three or four DMRS ports to be instructed to the UE within a single CDM group without increasing the DCI size (or DCI antenna port field size).

[0270] Alternatively, the size of the DCI (or the antenna port field size of the DCI) can be increased to provide more value / code points (or rows in the antenna port indication table) that can indicate three or four DMRS ports within a single CDM group. In this case, the UE can be more flexibly instructed on the combination of DMRS ports.

[0271] Figures 30 and 31 show cases with four layers or less (e.g., one codeword), but are not limited to this. Cases with more than four layers (e.g., two codewords) may also be similarly applicable. For example, in the case of two codewords (rank > 4), reserved bits or rows in the existing system's antenna port instruction table may be extended / updated to support instruction for three or more DMRS ports within the same CDM group.

[0272] For example, in the case of a given number of ports (e.g., 5 ports), DMRS Type 1 (e.g., DMRS eType1) may support a DMRS port index that assigns all CDM group 0 to DMRS ports {0, 1, 8, 9} (or fills all of CDM group 0 with DMRS ports {0, 1, 8, 9}) and also points to any one additional DMRS port (e.g., 2).

[0273] Furthermore, in DMRS Type 2 (e.g., DMRS eType2), a DMRS port index may be supported that assigns all CDM group 0 to DMRS ports {0, 1, 12, 13} and further points to any one additional DMRS port (e.g., 2).

[0274] Alternatively, instead of assigning all CDM group 0 functions to a specific DMRS port, it may be possible to assign CDM group 1 / 2 functions to a specific DMRS port, and specify additional DMRS ports for other CDM groups.

[0275] In existing systems (Rel.15-17), for two codewords, only the pattern of filling DMRS port 0 (CDM group 0) first is defined. In existing systems, when there are two codewords, it is prohibited to assign another DMRS port to another UE. Also, existing systems only support a maximum of 8 / 12 ports, so if one UE uses more than 5 layers, it was not a problem if it did not use other DMRS ports. On the other hand, Rel.18 and later support a maximum of 16 / 24 ports, so if the DMRS ports of other UEs are not multiplexed, the frequency utilization efficiency will be poor.

[0276] Therefore, in Rel.18 and later, the above cases may be supported in 2-codeword configurations. More specifically, in a type 1 DMRS with 5 ports, cases such as "1 port for CDM group 0" + "4 ports for CDM group 1", as in the example {1,2,3,10,11}, or cases where only CDM group 1 is used in a double-symbol DMRS, as in the example {2,3,6,7,10}, may be supported.

[0277] <Embodiment #4> Embodiment #4 describes a case where more than two PDSCH DMRS ports (e.g., three or four DMRS ports) are supported within the same CDM group. Here, the case where the maximum length of the DMRS for PUSCH is 2 (e.g., maxLength=2) is used as an example. Embodiment #4 may be applied independently of or in combination with Embodiments #0A / 0B / #1 / #2 / #3.

[0278] The UE may determine the DMRS port (or combination of DMRS ports) of the PUSCH by a field related to the antenna port included in the DCI used to schedule the PUSCH (e.g., the antenna port field). An association (e.g., an antenna port reference table) may be defined between the value (or code point, bit value) of the antenna port field and one or more DMRS port numbers.

[0279] In this case, the value of the antenna port field may indicate a combination of more than two DMRS ports (e.g., three or four DMRS ports) within a single DMRS CDM group. When the maximum length of a DMRS is 2 (e.g., maxLength=2), allowing the indication of more than two DMRS ports within a single DMRS CDM group can reduce the actual number of DMRS symbols used (e.g., Number of front-load symbols). This reduces DMRS overhead.

[0280] Furthermore, when a PUSCH DMRS port is assigned a rank higher than a certain rank, the instruction of more than two DMRS ports within a single CDM group may be supported. The specific rank may be two, in which case, when the rank is higher than two (e.g., ranks 3 and 4), the instruction of three or four DMRS ports within a single CDM group may be supported.

[0281] Figure 32 shows an example of an antenna port assignment table that can assign up to four DMRS ports within a single CDM group (or the same CDM group). Figure 32 may also be referenced when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 2. Tables corresponding to specific ranks (e.g., rank 3 / 4) may be referenced if DMRS Rel. 18 or later is supported / configured. For conditions such as the CDM group number corresponding to each DMRS port number, see Figure 11.

[0282] Figure 32 shows a case where, for a specific rank (e.g., a rank greater than 2 or a rank of 3 or greater), three or four DMRS ports are indicated within a single CDM group when the antenna port field included in the DCI has a specific value (here, a Value of 3-4 for rank 3, and a Value of 4-5 for rank 4). The rank may be indicated to the UE by the DCI, or the UE may obtain it from the value indicated in the DCI.

[0283] Specifically, in rank 3, a value of 3 indicates DMRS ports 0, 1, and 8 (3-layer) corresponding to CDM group #0, and a value of 4 indicates DMRS ports 2, 3, and 10 (3-layer) corresponding to CDM group #1. Similarly, in rank 4, a value of 4 indicates DMRS ports 0, 1, 8, and 9 (4-layer) corresponding to CDM group #0, and a value of 5 indicates DMRS ports 2, 3, 10, and 11 (4-layer) corresponding to CDM group #1. Of course, these are not the only possible values.

[0284] Figure 32 illustrates a case where the reserved bits (e.g., Reserved) in the antenna port instruction table referenced when the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 2 are extended / utilized to support instructing the UE to 3 or 4 DMRS ports within a single CDM group. Note that the diagram in Figure 32 is an example, and the values ​​and combinations of DMRS ports used to instruct 3 or 4 DMRS ports within a single CDM group are not limited to this.

[0285] Figure 33 shows an example of an antenna port assignment table that can assign up to four DMRS ports within a single CDM group (or the same CDM group). Figure 33 may also be referenced when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 2. Tables corresponding to specific ranks (e.g., rank 3 / 4) may be referenced if DMRS Rel. 18 or later is supported / configured. For conditions such as the CDM group number corresponding to each DMRS port number, see Figure 12.

[0286] Figure 33 shows a case where, for a specific rank (e.g., a rank greater than 2 or a rank of 3 or higher), three or four DMRS ports are indicated within a single CDM group when the antenna port field included in the DCI has a specific value (here, the value in rank 3 / rank 4 is 6-8). The rank may be indicated to the UE by the DCI, or the UE may obtain it from the value indicated by the DCI. Note that Figure 33 shows a case where the specific value in rank 3 and the specific value in rank 4 are common (e.g., 6-7), but it is not limited to this. For example, the specific value in rank 4 may be 5-7.

[0287] Specifically, in rank 3, a value of 6 indicates DMRS ports 0, 1, and 12 (3-layer) corresponding to CDM group #0; a value of 7 indicates DMRS ports 2, 3, and 14 (3-layer) corresponding to CDM group #1; and a value of 8 indicates DMRS ports 4, 5, and 16 (3-layer) corresponding to CDM group #2. Furthermore, in rank 4, a value of 6 indicates DMRS ports 0, 1, 12, and 13 (4-layer) corresponding to CDM group #0; a value of 7 indicates DMRS ports 2, 3, 14, and 15 (4-layer) corresponding to CDM group #1; and a value of 8 indicates DMRS ports 4, 5, 16, and 17 (4-layer) corresponding to CDM group #2. Of course, specific values ​​are not limited to these.

[0288] Figure 33 illustrates how the reserved bits (e.g., Reserved) in the antenna port instruction table referenced when the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 2 can be extended / utilized to support instructing the UE to 3 or 4 DMRS ports within a single CDM group. Note that the diagram in Figure 33 is an example, and the values ​​and combinations of DMRS ports used to instruct 3 or 4 DMRS ports within a single CDM group are not limited to this.

[0289] Figures 32 and 33 utilize the reserved bits of the antenna port instruction table, using the same DCI size (or DCI antenna port field size) as when using the antenna port instruction table of an existing system (e.g., Rel. 17). This allows three or four DMRS ports to be instructed to the UE within a single CDM group without increasing the DCI size (or DCI antenna port field size).

[0290] Alternatively, the size of the DCI (or the antenna port field size of the DCI) can be increased to increase the number of values / code points (or rows in the antenna port instruction table) that can indicate three or four DMRS ports within a single CDM group. In this case, the UE can be more flexibly instructed on the combination of DMRS ports.

[0291] Figures 32 and 33 show cases with four layers or less (e.g., one codeword), but are not limited to this. Cases with more than four layers (e.g., two codewords) may also be similarly applicable. For example, in the case of two codewords (rank > 4), reserved bits or rows in the existing system's antenna port instruction table may be extended / updated to support instruction for three or more DMRS ports within the same CDM group.

[0292] <Supplement> In this disclosure, the use of a table by a UE / base station (or performing processing based on a table) is not limited to using the table itself, but may also mean using an array, list, function, etc., that contains information that conforms to the table.

[0293] [Notification of information to UE] In the embodiments described above, notification of any information from a Network (NW) (e.g., a Base Station (BS)) to a UE (in other words, reception of any information from a BS at the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0294] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new Logical Channel ID (LCID) not defined in existing standards in the MAC subheader.

[0295] If the above notification is made by a DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) bits assigned to the DCI, or the format of the DCI.

[0296] Furthermore, the notification of any information to the UE in the above-described embodiment may be periodic, semi-persistent, or aperiodic.

[0297] [Notification of information from UE] In the embodiments described above, notification of any information from the UE (to the NW) (in other words, transmission / reporting of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0298] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new LCID, not specified in existing standards, in the MAC subheader.

[0299] If the above notice is issued by the UCI, the notice may be sent using PUCCH or PUSCH.

[0300] Furthermore, the notification of any information from the UE in the above-described embodiments may be periodic, semi-persistent, or aperiodic.

[0301] [Regarding the application of each embodiment] At least one of the embodiments described above may be applied if certain conditions are met. These conditions may be specified in a standard or notified to the UE / BS using upper-layer signaling / physical layer signaling.

[0302] At least one of the embodiments described above may apply only to a UE that has reported or supports a particular UE capability.

[0303] The specific UE capability may represent at least one of the following: • To support specific processing / operation / control / information for at least one of the above embodiments, • Supports dynamic switching of Rel.15 DMRS ports (tables) and Rel.18 DMRS ports (tables). • Supports PUSCH transmit / PDSCH receive with more than 4 layers based on single-symbol DMRS. • Support for increased DMRS ports for SU-MIMO (e.g., for DMRS Type 1 with more than 4 layers, for DMRS Type 2 with more than 6 layers). • Support for increased DMRS ports for MU-MIMO (e.g., for DMRS Type 1 with more than 4 layers, for DMRS Type 2 with more than 6 layers). • Support for directing three or four DMRS ports within a single CDM group.

[0304] Furthermore, the above-mentioned specific UE capabilities may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination thereof, such as cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SCS), or capabilities per feature set (FS) or feature set per component-carrier (FSPC).

[0305] Furthermore, the specific UE capabilities described above may be capabilities that apply across all duplexing schemes (common to all duplexing schemes), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0306] Furthermore, at least one of the embodiments described above may be applied when the UE is configured / activated / triggered by upper layer signaling / physical layer signaling to configure / activate specific information (or perform the actions of the embodiments described above) related to the embodiments described above. For example, such specific information may be information indicating that dynamic switching of DMRS ports is enabled, information indicating that dynamic switching of DMRS ports for a particular release (e.g., Rel.15 DMRS ports and Rel.18 DMRS ports) is enabled, information indicating that dynamic switching of antenna port indicator tables is enabled, information indicating that an increased number of DMRS ports is enabled, configuration information for DMRS type 1 (or 2) / single symbol DMRS / maximum length of DMRS = 1, or any RRC parameters for a particular release (e.g., Rel.18 / 19).

[0307] If the UE does not support at least one of the above-mentioned specific UE capabilities or does not have the above-mentioned specific information configured, the behavior of, for example, Rel.15 / 16 may be applied.

[0308] (Note) The following invention is added with respect to one embodiment of this disclosure. [Note 1-1] A terminal comprising: a receiving unit that receives Downlink Control Information (DCI) for scheduling a downlink shared channel; and a control unit that determines a combination of more than two DMRS ports within a Code Division Multiplexing (CDM) group corresponding to a DeModulation Reference Signal (DMRS) for the downlink shared channel, based on a field relating to antenna ports included in the DCI. [Appendix 1-2] The terminal as described in Appendix 1-1, wherein the field relating to the antenna port included in the DCI supports the designation of at least one of the three DMRS ports and four DMRS ports corresponding to the one CDM group. [Appendix 1-3] If the downlink sharing channel is two codewords, the fields relating to antenna ports included in the DCI indicate two CDM groups, and at least one of the two CDM groups has three DMRS ports and four DMRS ports corresponding to the terminals described in Appendix 1-1 or Appendix 1-2. [Appendix 1-4] A terminal as described in any of the appendices 1-1 to 1-3, wherein the maximum length of the DMRS is 1.

[0309] [Note 2-1] A terminal having: a receiving unit that receives Downlink Control Information (DCI) for scheduling an uplink shared channel; and a control unit that determines a combination of more than two DMRS ports within a Code Division Multiplexing (CDM) group corresponding to a DeModulation Reference Signal (DMRS) for the uplink shared channel, based on a field relating to antenna ports included in the DCI. [Note 2-2] The terminal as described in Appendix 2-1, wherein the field relating to the antenna port included in the DCI supports the designation of at least one of the three DMRS ports and four DMRS ports corresponding to the one CDM group. [Appendix 2-3] A terminal as specified in Appendix 2-1 or Appendix 2-2, which is designated by the DCI as having a rank of 3 or higher corresponding to the uplink shared channel. [Appendix 2-4] A terminal as described in any of Appendix 2-1 to Appendix 2-3, wherein the maximum length of the aforementioned DMRS is 1.

[0310] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0311] Figure 34 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 (which may also be simply called system 1) may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0312] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0313] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0314] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0315] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0316] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0317] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0318] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0319] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0320] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0321] The core network 30 may include network functions (NF) such as User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). Multiple functions may be provided by a single network node. Furthermore, communication with an external network (e.g., the Internet) may occur via the DN.

[0322] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0323] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0324] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0325] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0326] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0327] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0328] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0329] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0330] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0331] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0332] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0333] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "Physical" may be omitted when describing various channels.

[0334] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0335] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0336] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0337] (base station) Figure 35 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0338] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0339] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0340] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0341] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0342] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0343] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0344] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0345] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0346] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0347] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0348] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0349] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0350] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0351] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0352] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30 (e.g., network nodes providing NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0353] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0354] The transmitting / receiving unit 120 may transmit Downlink Control Information (DCI) for scheduling downlink shared channels. The control unit 110 may, by fielding an antenna port in the DCI, specify a combination of more than two DMRS ports within a code division multiplexing (CDM) group corresponding to a demodulation reference signal (DMRS) for the downlink shared channel.

[0355] The transmitting / receiving unit 120 may also transmit Downlink Control Information (DCI) for scheduling uplink shared channels. The control unit 110 may, by fielding an antenna port in the DCI, specify a combination of more than two DMRS ports within a single Code Division Multiplexing (CDM) group corresponding to a DeModulation Reference Signal (DMRS) for the uplink shared channel.

[0356] (User terminal) Figure 36 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0357] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0358] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0359] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0360] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0361] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0362] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0363] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0364] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0365] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0366] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0367] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0368] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0369] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0370] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0371] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0372] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0373] The transmitting / receiving unit 220 may receive Downlink Control Information (DCI) for scheduling downlink shared channels. The control unit 210 may determine a combination of more than two DMRS ports within a code division multiplexing (CDM) group corresponding to a demodulation reference signal (DMRS) for the downlink shared channel, based on the antenna port fields included in the DCI.

[0374] The fields relating to antenna ports included in the DCI may support the designation of at least one of three DMRS ports and four DMRS ports corresponding to one CDM group. If the downlink shared channel has two codewords, the fields relating to antenna ports included in the DCI may indicate two CDM groups, and at least one of the two CDM groups may correspond to three DMRS ports and four DMRS ports. The maximum length of a DMRS may be 1.

[0375] The transmitting / receiving unit 220 may receive Downlink Control Information (DCI) for scheduling uplink shared channels. The control unit 210 may determine a combination of more than two DMRS ports within a code division multiplexing (CDM) group corresponding to a demodulation reference signal (DMRS) for the uplink shared channel, based on the antenna port fields included in the DCI.

[0376] The fields related to antenna ports included in the DCI may support the designation of at least one of three DMRS ports and four DMRS ports corresponding to one CDM group. The DCI may indicate three or more ranks for uplink shared channels. The maximum length of a DMRS may be 1.

[0377] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0378] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0379] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 37 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0380] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0381] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0382] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0383] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0384] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0385] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0386] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0387] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0388] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0389] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0390] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0391] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0392] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0393] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0394] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0395] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0396] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0397] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0398] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0399] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0400] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0401] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0402] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0403] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0404] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0405] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0406] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0407] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0408] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0409] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0410] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0411] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0412] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0413] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0414] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0415] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0416] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0417] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0418] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0419] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0420] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0421] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0422] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0423] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0424] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0425] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0426] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform a control / operation based on said information.

[0427] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0428] A mobile station may also be called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0429] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0430] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0431] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0432] Figure 38 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0433] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0434] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0435] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0436] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0437] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0438] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0439] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0440] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0441] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0442] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0443] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0444] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0445] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0446] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0447] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0448] Each aspect / embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0449] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0450] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0451] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0452] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0453] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0454] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0455] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0456] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0457] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0458] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0459] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0460] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0461] In this disclosure, terms such as "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. Furthermore, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0462] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0463] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

[0464] This application is based on Japanese Patent Application No. 2022-166692, filed on October 18, 2022. All of its contents are included here.

Claims

1. A receiving unit that receives upper-layer parameters for setting the activation of a DeModulation Reference Signal (DMRS) port and Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), The control unit has a field relating to antenna ports included in the DCI that determines a combination of more than two DMRS ports within one Code Division Multiplexing (CDM) group corresponding to the DMRS for the PDSCH, A combination of DMRS ports greater than the above 2 is a terminal that includes one or more extended DMRS ports enabled by the setting of the above-mentioned upper-layer parameters.

2. The terminal according to claim 1, wherein the field relating to the antenna port included in the DCI supports the designation of at least one of the three DMRS ports and four DMRS ports corresponding to one CDM group.

3. The terminal according to claim 1, wherein the maximum length of the DMRS is 1.

4. The terminal according to claim 1, wherein the number of CDM groups corresponding to the DMRS without data is two or three.

5. A step of receiving upper-layer parameters for setting the activation of a DeModulation Reference Signal (DMRS) port, and Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), The process includes determining a combination of more than two DMRS ports within a Code Division Multiplexing (CDM) group corresponding to the DMRS for the PDSCH, based on a field relating to antenna ports included in the DCI. A wireless communication method for a terminal, wherein a combination of DMRS ports greater than the above 2 includes one or more extended DMRS ports enabled by the setting of the above-upper layer parameters.

6. A transmitter that transmits upper-layer parameters for enabling a DeModulation Reference Signal (DMRS) port and Downlink Control Information (DCI) for scheduling a Physical Downlink Shared Channel (PDSCH), The DCI includes a field relating to antenna ports that indicates a combination of more than two DMRS ports within a Code Division Multiplexing (CDM) group corresponding to the DMRS for the PDSCH, A base station with more DMRS port combinations than the above 2 includes one or more extended DMRS ports enabled by the setting of the above-mentioned upper-layer parameters.

7. A system including a terminal and a base station, The terminal includes a receiving unit that receives upper-layer parameters for enabling the DeModulation Reference Signal (DMRS) port and Downlink Control Information (DCI) for scheduling the Physical Downlink Shared Channel (PDSCH). The control unit has a field relating to antenna ports included in the DCI that determines a combination of more than two DMRS ports within one Code Division Multiplexing (CDM) group corresponding to the DMRS for the PDSCH, A combination of DMRS ports greater than the above 2 includes one or more extended DMRS ports enabled by the setting of the above-upper layer parameters. The aforementioned base station is A transmission unit that transmits the aforementioned upper layer parameters and the DCI, A system comprising: a control unit that instructs a combination of DMRS ports greater than the two described above; and

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