Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is characterized by being provided with: a receiving unit that receives a combination of a Class 1 demodulation reference signal (DMRS) port, a Class 2 DMRS port, and a Class 3 DMRS port in at least one code division multiplexing (CDM) group, and that receives the combination of the Class 1 demodulation reference signal (DMRS) port, the Class 2 DMRS port, and the Class 3 DMRS port in the at least one code division multiplexing (CDM) group; receiving a downlink control information (DCI) indicating the combination, and scheduling the downlink control information (DCI) for an uplink shared channel of one or two code words; and a control unit that determines a DMRS port for the uplink shared channel on the basis of the combination, the control unit controlling the switching of the DMRS port on the basis of information relating to the switching of the DMRS port. According to one embodiment of the present disclosure, communication can be appropriately controlled even when the number of DMRS ports is increased compared to conventional ones.

Description

TECHNICAL FIELD

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

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

[0003] A subsequent system of LTE (for example, also referred to as a 5th generation mobile communication system (5G), 5G+, a 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also being studied.

[0004] Prior Art Documents

[0005] Non-Patent Literature

[0006] Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 SUMMARY

[0007] Problems to be Solved by the Invention

[0008] Future-oriented wireless communication systems (e.g., Rel. 18 NR) are under study to increase the number of DeModulation Reference Signal (DMRS) ports. Such new DMRS ports different from the existing DMRS ports (also referred to as Rel. 15 DMRS ports) are also referred to as Rel. 18 DMRS ports.

[0009] However, in the case where the Rel. 18 DMRS port in which the number of DMRS ports is increased is introduced, the different from the indication of the Rel. 15 DMRS port, the reference antenna port table, and the like have not been sufficiently studied. In the case where this is not explicitly specified, there is a concern that the communication throughput / communication quality will not be appropriately improved.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control communication even in the case where the number of DMRS ports is increased compared to the past.

[0011] Means for solving the problem

[0012] A terminal according to an aspect of the present disclosure includes: a reception unit that receives, in a case where a combination of a Category 1 DeModulation Reference Signal (DMRS) port, a Category 2 DMRS port, and a Category 3 DMRS port within at least one Code Division Multiplexing (CDM) group is supported, Downlink Control Information (DCI) indicating the combination and scheduling an uplink shared channel for one or two codewords; and a control unit that judges a DMRS port for the uplink shared channel based on the combination, the control unit controlling switching of the DMRS port based on information related to the switching of the DMRS port.

[0013] Effects of the Invention

[0014] According to an aspect of the present disclosure, even in the case where the number of DMRS ports is increased compared to the past, it is possible to appropriately control communication. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 An example of an existing DMRS port table indicating Type 1 / 2 for DMRS for PDSCH.

[0016] Figure 2An example of an existing DMRS port table for DMRS configuration type 1 / 2 for PUSCH.

[0017] Figures 3A-3C A figure showing an example of a new OCC (Orthogonal Cover Code) that can be applied.

[0018] Figure 4A A figure showing an example of association of CDM group, DMRS port, and OCC in extended type 1. Figure 4B A figure showing an example of association of CDM group, DMRS port, and OCC in extended type 2.

[0019] Figure 5 An example of an antenna port table in the case of DMRS type = extended type 1 and DMRS maximum length = 1 for PDSCH.

[0020] Figure 6 A variant of an antenna port table in the case of DMRS type = extended type 1 and DMRS maximum length = 1 for PDSCH.

[0021] Figure 7 An example of an antenna port table in the case of DMRS type = extended type 1 and DMRS maximum length = 2 for PDSCH.

[0022] Figure 8 An example of an antenna port table in the case of DMRS type = extended type 1 and DMRS maximum length = 2 for PDSCH.

[0023] Figures 9A-9B A variant of an antenna port table in the case of DMRS type = extended type 1 and DMRS maximum length = 2 for PDSCH.

[0024] Figure 10 An example of an antenna port table in the case of DMRS type = extended type 2 and DMRS maximum length = 1 for PDSCH.

[0025] Figure 11 An example of an antenna port table in the case of DMRS type = extended type 2 and DMRS maximum length = 1 for PDSCH.

[0026] Figures 12A-12B A variant of an antenna port table in the case of DMRS type = extended type 2 and DMRS maximum length = 1 for PDSCH.

[0027] Figure 13An example of an antenna port table for the case of DMRS type = extended Type 2 and DMRS maximum length = 2 for PDSCH.

[0028] Figure 14 An example of an antenna port table for the case of DMRS type = extended Type 2 and DMRS maximum length = 2 for PDSCH.

[0029] Figure 15 An example of an antenna port table for the case of DMRS type = extended Type 2 and DMRS maximum length = 2 for PDSCH.

[0030] Figures 16A-16B A variant of an antenna port table for the case of DMRS type = extended Type 2 and DMRS maximum length = 2 for PDSCH.

[0031] Figures 17A-17D An example of an antenna port table for the case of DMRS type = extended Type 1, DMRS maximum length = 1, and rank 1~4 for PUSCH.

[0032] Figures 18A-18D An example of an antenna port table for the case of DMRS type = extended Type 1, DMRS maximum length = 1, and rank 5~8 for PUSCH.

[0033] Figures 19A-19B An example of an antenna port table for the case of DMRS type = extended Type 1, DMRS maximum length = 2, and rank 1~2 for PUSCH.

[0034] Figures 20A-20C An example of an antenna port table for the case of DMRS type = extended Type 1, DMRS maximum length = 2, and rank 3~5 for PUSCH.

[0035] Figures 21A-21C An example of an antenna port table for the case of DMRS type = extended Type 1, DMRS maximum length = 2, and rank 6~8 for PUSCH.

[0036] Figures 22A-22B An example of an antenna port table for the case of DMRS type = extended Type 2, DMRS maximum length = 1, and rank 1~2 for PUSCH.

[0037] Figures 23A-23B An example of an antenna port table for the case of DMRS type = extended Type 2, DMRS maximum length = 1, and rank 3~4 for PUSCH.

[0038] Figures 24A-24D An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 1, and rank 5 to 8 for PUSCH.

[0039] Figure 25 An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and rank 1 for PUSCH.

[0040] Figure 26 An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and rank 2 for PUSCH.

[0041] Figures 27A-27B An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and rank 3 to 4 for PUSCH.

[0042] Figures 28A-28B An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and rank 5 to 6 for PUSCH.

[0043] Figures 29A-29B An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and rank 7 to 8 for PUSCH.

[0044] Figure 30A An example of an antenna port table in the case of DMRS type = extended Type 1, DMRS maximum length = 2, and 2 codewords for PDSCH. Figure 30B An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and 2 codewords for PDSCH.

[0045] Figure 31 FIG. 1 is a diagram showing an example of an outline configuration of a wireless communication system according to an embodiment.

[0046] Figure 32 FIG. 2 is a diagram showing an example of a configuration of a base station according to an embodiment.

[0047] Figure 33 FIG. 3 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0048] Figure 34 FIG. 4 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment.

[0049] Figure 35FIG. 1 is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0050] (DMRS)

[0051] A front-loaded DeModulation Reference Signal (DMRS) is a DMRS of an initial (1st symbol or 1st nearby symbol) for earlier demodulation. An additional DMRS can be configured by RRC for a high-speed terminal (terminal, user terminal, User Equipment (UE)) or a high modulation and coding scheme (MCS) / rank. The frequency location of the additional DMRS is the same as that of the front-loaded DMRS.

[0052] For the time domain, a DMRS mapping type A or B is configured. In the DMRS mapping type A, a DMRS position l_0 is counted by a symbol index within a slot. l_0 is configured by a parameter (dmrs-TypeA-Position) within MIB or a common ServingCellConfigCommon. A DMRS position 0 (reference point l) means an initial symbol of a slot or each hop. In the DMRS mapping type B, a DMRS position l_0 is counted by a symbol index within a PDSCH / PUSCH. l_0 is always 0. A DMRS position 0 (reference point l) means an initial symbol of a PDSCH / PUSCH or each hop.

[0053] A DMRS position is specified by a table of a specification, and depends on a duration of a PDSCH / PUSCH. A position of an additional DMRS is fixed.

[0054] For the frequency domain, a (PDSCH / PUSCH) DMRS configuration type 1 or 2 is configured. The DMRS configuration type 1 has a comb structure, and can be applied to both CP-OFDM (transport precoding=disabled) and DFT-S-OFDM (transport precoding=enabled). The DMRS configuration type 2 can be applied only to CP-OFDM.

[0055] A single-symbol DMRS or a double-symbol DMRS is configured.

[0056] Single-symbol DMRS (mandatory in Rel. 15) is generally used. In single-symbol DMRS, the number of appended DMRS (symbols) is {0, 1, 2, 3}. Single-symbol DMRS supports both cases where frequency hopping is valid and cases where frequency hopping is not valid. Single-symbol DMRS is used if the maximum number (maxLength) within the uplink DMRS configuration (DMRS-UplinkConfig) is not set.

[0057] Double-symbol DMRS is used for more DMRS ports (especially Multi User Multi Input Multi Output (MU-MIMO)). In double-symbol DMRS, the number of appended DMRS (symbols) is {0, 1}. Double-symbol DMRS supports cases where frequency hopping is not valid. In cases where the maximum number (maxLength) within the uplink DMRS configuration (DMRS-UplinkConfig) is 2 (len2), it is decided by DCI or configured grant whether single-symbol DMRS or double-symbol DMRS is used.

[0058] According to the above, possible configuration patterns of DMRS consider the following combinations.

[0059] • DMRS configuration type 1, DMRS mapping type A, single-symbol DMRS

[0060] • DMRS configuration type 1, DMRS mapping type A, double-symbol DMRS

[0061] • DMRS configuration type 1, DMRS mapping type B, single-symbol DMRS

[0062] • DMRS configuration type 1, DMRS mapping type B, double-symbol DMRS

[0063] • DMRS configuration type 2, DMRS mapping type A, single-symbol DMRS

[0064] • DMRS configuration type 2, DMRS mapping type A, double-symbol DMRS

[0065] • DMRS configuration type 2, DMRS mapping type B, single-symbol DMRS

[0066] • DMRS configuration type 2, DMRS mapping type B, double-symbol DMRS

[0067] A plurality of DMRS ports mapped to the same resource element (Resource Element (RE), time, and frequency) is referred to as a DMRS Code Division Multiplexing (CDM) group.

[0068] For DMRS configuration type 1 and single-symbol DMRS, 4 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by length-2 FD OCC (Frequency Domain OCC). Between a plurality of DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed by Frequency Division Multiplexing (FDM).

[0069] For DMRS configuration type 1 and double-symbol DMRS, 8 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by length-2 FD OCC, and 2 DMRS ports are multiplexed by TD OCC (Time Domain OCC). Between a plurality of DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed by FDM.

[0070] For DMRS configuration type 2 and single-symbol DMRS, 6 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by length-2 FD OCC. Between a plurality of DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed by FDM.

[0071] For DMRS configuration type 2 and double-symbol DMRS, 12 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by length-2 FD OCC, and 2 DMRS ports are multiplexed by TD OCC. Between a plurality of DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed by FDM.

[0072] Here, an example of DMRS mapping type B is shown, but the same applies to DMRS mapping type A.

[0073] In the parameters for PDSCH DMRS (existing table, existing DMRS port table, Figure 1 ) for DMRS configuration type 1, DMRS ports 1000-1007 can be used, and for DMRS configuration type 2, DMRS ports 1000-1011 can be used.

[0074] In the parameters for PUSCH DMRS (existing table, existing DMRS port table, Figure 2 ), for DMRS configuration type 1, DMRS ports 0-7 can be used, and for DMRS configuration type 2, DMRS ports 0-11 can be used.

[0075] (Ports of reference signals)

[0076] For orthogonalization of MIMO layers and the like, a reference signal using multiple ports (for example, DeModulation Reference Signal (DMRS), CSI-RS) is used.

[0077] For example, for Single User MIMO (SU-MIMO), different DMRS ports / CSI-RS ports can also be configured per layer. For Multi User MIMO (MU-MIMO), different DMRS ports / CSI-RS ports can also be configured per layer within 1 UE and per UE.

[0078] In addition, if the number of CSI-RS ports using a larger value than the number of layers used in data is used, it can be expected that more accurate channel state measurement can be performed based on the CSI-RS, which contributes to improvement of throughput.

[0079] In Rel-15 NR, regarding DMRS of multiple ports, by using Frequency Division Multiplexing (FDM), Frequency Domain Orthogonal Cover Code (FD-OCC), Time Domain OCC (TD-OCC), and the like, a maximum of 8 ports are supported if it is type 1 DMRS (in other words, DMRS configuration type 1), and a maximum of 12 ports are supported if it is type 2 DMRS (in other words, DMRS configuration type 2).

[0080] In Rel-15 NR, as the above FDM, a mode of transmission frequencies in a comb shape (resource set in a comb shape) is used. As the above FD-OCC, a Cyclic Shift (CS) is used. In addition, the above TD-OCC can be applied only to a two-symbol DMRS.

[0081] The OCC of the present disclosure can also be mutually rewritten with orthogonal codes, orthogonalization, cyclic shift, and the like.

[0082] In addition, the type of DMRS can also be referred to as a DMRS configuration (structure) type (DMRS configuration type).

[0083] In the DMRS, a DMRS in which resource mapping is performed in units of 2 consecutive (adjacent) symbols can also be referred to as a double-symbol DMRS, and a DMRS in which resource mapping is performed in units of 1 symbol can also be referred to as a single-symbol DMRS.

[0084] Any DMRS can be mapped to 1 or more symbols per slot according to the length of a data channel. A DMRS mapped to the start position of a data symbol can also be referred to as a front-loaded DMRS, and a DMRS additionally mapped to a position other than this can also be referred to as an additional DMRS.

[0085] In the case of DMRS configuration type 1 and single-symbol DMRS, a comb and a CS can also be used for orthogonalization. For example, a maximum of 4 antenna ports (APs) can be supported by using 2 combs and 2 CSs (Comb2+2CS).

[0086] In the case of DMRS configuration type 1 and double-symbol DMRS, a comb, a CS, and a TD-OCC can also be used for orthogonalization. For example, a maximum of 8 APs can be supported by using 2 combs, 2 CSs, and TD-OCCs {1, 1} and {1, -1}.

[0087] In the case of DMRS configuration type 2 and single-symbol DMRS, a FD-OCC can also be used for orthogonalization. For example, a maximum of 6 APs can be supported by applying an orthogonal code (2-FD-OCC) to 2 resource elements (REs) adjacent in the frequency direction.

[0088] In the case of DMRS configuration type 2 and double-symbol DMRS, a FD-OCC and a TD-OCC can also be used for orthogonalization. For example, a maximum of 12 APs can be supported by applying an orthogonal code (2-FD-OCC) to 2 REs adjacent in the frequency direction and applying TD-OCCs {1, 1} and {1, -1} to 2 REs adjacent in the time direction.

[0089] Further, in Rel-15 NR, regarding the CSI-RS of multiple ports, by using FDM, Time Division Multiplexing (TDM), frequency domain OCC, time domain OCC, and the like, a maximum of 32 ports are supported. Regarding the orthogonalization of the CSI-RS, the same method as the above-described DMRS can also be applied.

[0090] In addition, the group of DMRS ports orthogonalized by the above-described FD-OCC / TD-OCC is also referred to as a Code Division Multiplexing (CDM) group.

[0091] FDM is performed between different CDM groups, and thus orthogonality is performed. On the other hand, within the same CDM group, there is a case where the orthogonality of the applied OCC is destroyed due to channel fluctuation or the like. In this case, if signals within the same CDM group are received with different reception powers, a near-far problem occurs, and there is a concern that orthogonality cannot be ensured.

[0092] Here, the TD-OCC / FD-OCC of the DMRS of Rel.15 NR is described. The DMRS mapped to the Resource Element (RE) can also correspond to a sequence obtained by multiplying the parameter (may also be referred to as a sequence element, etc.) w f (k') of the FD-OCC and the parameter (may also be referred to as a sequence element, etc.) w t (l') of the TD-OCC to the DMRS sequence.

[0093] Both the TD-OCC and the FD-OCC of the DMRS of Rel.15 NR correspond to OCC with a sequence length (may also be referred to as OCC length) = 2. For example, the Rel.15 Type 1 / Type 2 DMRS port (for example, rel.15 Type 1 / Type 2 DMRS ports) can also be defined by a DMRS port with an FD-OCC length of 2 (for example, DMRS ports with an FD-OCC length = 2).

[0094] Therefore, the preferable values of the above-described k' and l' are both 0 and 1. By multiplying this FD-OCC in RE units, it is possible to multiplex 2-port DMRS using the same time and frequency resources (2 REs). If both the FD-OCC and the TD-OCC are applied, it is possible to multiplex 4-port DMRS using the same time and frequency resources (4 REs).

[0095] The aforementioned two existing DMRS port tables (association of antenna port number and parameters) for PDSCH correspond to DMRS configuration type 1 and type 2, respectively. In addition, p denotes the number of the antenna port, and Δ denotes a parameter for making a frequency resource deviation (shift).

[0096] 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 respectively applied, and thus orthogonalized using FD-OCC.

[0097] For antenna ports 1000-1001, antenna ports 1002-1003 (and antenna ports 1004-1005 in the case of type 2), Δ of different values 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.

[0098] For antenna ports 1000-1003 of type 1 and antenna ports 1004-1007, {w t (0), w t (1)} = {+1, +1} and {w t (0), w t (1)} = {+1, -1} are respectively applied, and thus orthogonalized 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.

[0099] It is under study to specify, for MU-MIMO of DL / UL, a larger number of DMRS ports to be orthogonalized (without increasing DMRS overhead) only for CP-OFDM; to make a common design between DMRSs of DL and UL; to be up to 24 DMRS ports to be orthogonalized; and to make the maximum number of DMRS ports to be orthogonalized twice for both single-symbol DMRS and double-symbol DMRS for each DMRS configuration type that can be applied.

[0100] In Rel. 15, the following cases 1 to 4 can be set.

[0101] [Case 1] Single-symbol DMRS of DMRS configuration type 1

[0102] The total number of DMRS ports is (based on comb / FDM) 2 x (based on FD OCC) 2 = 4 ports.

[0103] [Case 2] Two-symbol DMRS of DMRS configuration type 1

[0104] The total number of DMRS ports is (based on comb / FDM) 2 x (based on FD OCC) 2 x (based on TD OCC) 2 = 8 ports.

[0105] [Case 3] One-symbol DMRS of DMRS configuration type 2

[0106] The total number of DMRS ports is (based on FDM) 3 x (based on FD OCC) 2 = 6 ports.

[0107] [Case 4] Two-symbol DMRS of DMRS configuration type 2

[0108] The total number of DMRS ports is (based on comb) 3 x (based on FD OCC) 2 x (based on TD OCC) 2 = 12 ports.

[0109] In Rel. 18, it is being studied to increase the total number of DMRS ports to 2 times, 8, 16, 12, 24 for Cases 1, 2, 3, 4, respectively.

[0110] For the increase in the number of DMRS ports, the following 5 options (DMRS port number increase methods) are being studied.

[0111] < Option 1 >

[0112] • Introduction of a new OCC of a longer length (e.g., 4 or 6) than the existing OCC.

[0113] In Option 1, as research items, the possibility of performance degradation in the case of large delay spread, the possibility of scheduling restrictions, and backward compatibility, etc. are listed.

[0114] < Option 2 >

[0115] • Use of TD-OCC on multiple non-continuous DMRS symbols (e.g., TD-OCC on front-loaded DMRS / additional DMRS).

[0116] In Option 2, as research items, the possibility of performance degradation in the case of fast UE speed, the possibility of scheduling restrictions (example: application method of frequency hopping), the possibility of DMRS configuration being limited (example: the number of additional DMRS is limited), and backward compatibility, etc. are listed.

[0117] < Option 3 >

[0118] • Increase the number of CDM groups (e.g., increase the number of comb / FDM).

[0119] In Option 3, as a study item, the possibility of performance degradation in the case of large delay spread, and backward compatibility, etc. are listed.

[0120] < Option 4 >

[0121] • Reuse the symbols of the additional DMRS to increase the orthogonal DMRS ports.

[0122] In Option 4, as a study item, the possibility of performance degradation in the case of fast UE speed, the possibility of DMRS configuration being limited (e.g., the number of additional DMRS is limited), and backward compatibility, etc. are listed.

[0123] < Option 5 >

[0124] • Utilization of TD-OCC on multiple DMRS symbols that are not continuous in combination with FD-OCC / FDM (reuse the symbols of the additional DMRS in order to improve channel estimation performance).

[0125] In Option 5, as a study item, the possibility of performance degradation in the case of fast UE speed, the possibility of scheduling restriction (e.g., application method of frequency hopping), the possibility of DMRS configuration being limited (e.g., the number of additional DMRS is limited), and backward compatibility, etc. are listed.

[0126] Option 1 / 3 can also be supported. In addition thereto, TD OCC can also be supported. The difference between Options 2 and 5 can also be whether to support RRC-based semi-static switching or DCI-based dynamic switching between FD-OCC and TD-OCC.

[0127] In the option 5 of the aforementioned DMRS port number increasing method, as in the example of FIG. 3, it can also be that a new FD-OCC with a length of 4 is applied, a new TD-OCC with a length of 2 is applied to discontinuous multiple DMRS symbols, and the number of DMRS ports within one CDM group is 4. In this case, the receiving side can separate the signals by decoding either the FD-OCC or the TD-OCC, and has an advantage compared to the option 1 / 3. For example, by using the TD-OCC, the characteristics (orthogonality) deteriorate at high speed, channel estimation cannot be started even if only the pre-DMRS symbol is received, the additional DMRS symbol needs to be received, and problems such as delay of PDSCH decoding occur, in this case, the receiving side can decode using only the FD-OCC. For example, by using the FD-OCC, in the case where problems such as deterioration of characteristics (orthogonality) occur in the case where the delay spread is large, the receiving side can decode using only the TD-OCC.

[0128] In the option 5 for the aforementioned DMRS port number increase, it can also be that a new FD-OCC with a length of 6 is applied, and a new TD-OCC with a length of 2 is applied to discontinuous multiple DMRS symbols.

[0129] In this way, after Rel.18, new FD-OCCs longer than 2 are supported. The DMRS ports for Rel.18 and later for type 1 / type 2, for example, can also be referred to as Rel.18 extended type 1 / extended type 2 (enhanced type 1 / enhanced type 2) DMRS ports. The extended type 1 / extended type 2 can also be referred to as e type 1 / e type 2.

[0130] For example, the Rel.18 e type 1 / e type 2 DMRS port can also be defined by a DMRS port with an FD-OCC length of more than 2 (for example, a DMRS port with an FD-OCC length > 2). For example, it can also be that the FD-OCC length of the Rel.18 e type 1 / e type 2 DMRS port is = 4.

[0131] In addition, the type 1 / type 2 DMRS port defined from Rel.15 with an FD-OCC length of 2 can also be referred to as a Rel.15 type 1 / type 2 DMRS port.

[0132] Rel.18 e Type 1 DMRS ports can also take port indices p = #1000-1015. For example, for DMRS ports accompanied with new FD-OCC #0, 1, the same DMRS port indices as Rel.15 DMRS ports (DMRS ports #1000-#1007) can also be used. For DMRS ports accompanied with new FD-OCC #2, 3, different DMRS port indices from Rel.15 DMRS ports (DMRS ports #1008-#1015) can also be used.

[0133] Rel.18 e Type 2 DMRS ports can also take port indices p = #1000-1023. For example, for DMRS ports accompanied with new FD-OCC #0, 1, the same DMRS port indices as Rel.15 DMRS ports (DMRS ports #1000-#1011) can also be used. For DMRS ports accompanied with new FD-OCC #2, 3, different DMRS port indices from Rel.15 DMRS ports (DMRS ports #1012-#1023) can also be used.

[0134] (New OCC for DMRS of PDSCH / PUSCH)

[0135] In Rel.18, as new OCC for DMRS (extended Type 1 / extended Type 2 DMRS) of PDSCH / PUSCH, FD-OCC of length 4, TD-OCC of length 2 are supported. Figures 3A-3C is a figure indicating an example of new OCC that can be applied. FD-OCC and TD-OCC can also be simply referred to as OCC.

[0136] As shown in Figure 3A , FD-OCC of length 4 based on a 4-row 4-column Walsh matrix (series) can also be specified. In Figure 3A , for FD-OCC indices i = {0, 1, 2, 3}, 4 sequences can be obtained. The Walsh matrix can also be rewritten as Hadamard code (for example, Hadamard code). OCC based on the Walsh matrix (series) is useful for DL reception (for example, reception of PDSCH).

[0137] As shown in Figure 3B , OCC of length 4 based on cyclic shift can also be specified. In Figure 3B , for FD-OCC indices i = {0, 1, 2, 3}, 4 sequences can be obtained by using cyclic shift {i·0, i·π, i·π / 2, i·3π / 2}. OCC based on cyclic shift is useful for UL transmission (for example, transmission of PUSCH).

[0138] As Figure 3C indicated, a TD-OCC with a length of 2 can also be defined. In Figure 3C , two series can be obtained for TD-OCC indexes i = {0, 1}.

[0139] Further, a table for extended Type 1 / extended Type 2 DMRS (association of port index, CDM group index, and new OCC index) can also be defined in association with the OCC shown in Fig. 3. The port index of PDSCH can be represented by a number obtained by adding 1000 to the port index of PUSCH.

[0140] The new FD-OCC can also be any one of the above-described OCCs.

[0141] In Figure 3A and Figure 3B , each of the front half and the rear half of OCC #0, #1 (OCCs corresponding to OCC indexes 0, 1) with a length of 4 is, for example, the same as OCC #0, #1 (OCCs corresponding to OCC indexes 0, 1) with a length of 2 shown in Figure 3C .

[0142] In the present disclosure, the OCC (FD-OCC / TD-OCC) corresponding to OCC index i can also be referred to as OCC #i.

[0143] A part of the multiple series of the new FD-OCC can also be associated with the Rel. 15 DMRS port index.

[0144] In the case of using an FD-OCC with a length of 2, the Rel. 15 DMRS port table for DMRS configuration Type 1, the Rel. 15 DMRS port table for DMRS configuration Type 2 can also be used.

[0145] Extended DMRS configuration Type 1 (DMRS extended Type 1, DMRS extended Type = 1, DMRS eType 1) uses the frequency domain configuration of DMRS configuration Type 1 (DMRS Type 1, DMRS Type = 1, DMRS Type 1) and a new FD-OCC. Extended DMRS configuration Type 2 (DMRS extended Type 2, DMRS extended Type = 2, DMRS eType 2) uses the frequency domain configuration of DMRS configuration Type 2 (DMRS Type 2, DMRS Type = 2, DMRS Type 2) and a new FD-OCC.

[0146] In the present disclosure, DMRS configuration type 1, DMRS type 1, DMRS type = 1, DMRS Type 1 can also be mutually rewritten. In the present disclosure, DMRS configuration type 2, DMRS type 2, DMRS type = 2, DMRS Type 2 can also be mutually rewritten. In the present disclosure, extended DMRS configuration type 1, DMRS extended type 1, DMRS extended type = 1, DMRS eType 1 can also be mutually rewritten. In the present disclosure, extended DMRS configuration type 2, DMRS extended type 2, DMRS extended type = 2, DMRS eType 2 can also be mutually rewritten.

[0147] In the present disclosure, DMRS maximum length, maxLength can also be mutually rewritten.

[0148] In the present disclosure, existing FD-OCC, FD-OCC of length 2, Rel. 15 FD-OCC, w f (k') can also be mutually rewritten. In each embodiment, new FD-OCC, FD-OCC longer than 2, Rel. 18 FD-OCC, w f (k') can also be mutually rewritten.

[0149] (CDM group)

[0150] As described above, a plurality of DMRS ports mapped to the same RE (resource of time and frequency) can be referred to as a DMRS CDM group.

[0151] Figure 4A is a diagram indicating an example of the association of a CDM group, a DMRS port, and an OCC in extended type 1. Figure 4B is a diagram indicating an example of the association of a CDM group, a DMRS port, and an OCC in extended type 2. Figure 4A and Figure 4B The DMRS port of can also be referred to as an extended DMRS port. In addition, in Figure 4A and Figure 4B , it can be applied to both single-symbol DMRS and double-symbol DMRS.

[0152] As Figure 4AAs shown, for the DMRS configuration of extended Type 1 and single-symbol DMRS, 8 DMRS ports (port #0-3, 8-11) can be used. Within each DMRS CDM group (CDM group #0-1), 4 DMRS ports (port #0-1, 8-9, port #2-3, 10-11) are multiplexed by length-4 FD OCC (FD-OCC #0-3). Between multiple DMRS CDM groups (two DMRS CDM groups (CDM group #0-1)), two DMRS ports are multiplexed by FDM.

[0153] Further, as shown, in the case of the DMRS configuration of extended Type 1 and double-symbol DMRS, further, 8 DMRS ports (port #4-7, 12-15) can be used. Within each DMRS CDM group (CDM group #0-1), 4 DMRS ports (port #4-5, 12-13, port #6-7, 14-15) are multiplexed by length-4 FD OCC (FD-OCC #0-3). Between multiple DMRS CDM groups (two DMRS CDM groups (CDM group #0-1)), two DMRS ports are multiplexed by FDM. Further, two DMRS ports in the time direction are multiplexed by length-2 TD OCC (TD-OCC #0-1). That is, multiple (2) CDM groups with the same index are multiplexed by TDM. Figure 4A

[0154] In the extended Type 1 shown in FIG. 6, the DMRS ports corresponding to CDM group #0 are {port #0, 1, 8, 9}, {port #4, 5, 12, 13}, and the DMRS ports corresponding to CDM group #1 are {port #2, 3, 10, 11}, {port #6, 7, 14, 15}. Figure 4A As shown, for the DMRS configuration of extended Type 2 and single-symbol DMRS, 12 DMRS ports (port #0-5, 12-17) can be used. Within each DMRS CDM group (CDM group #0-2), 4 DMRS ports (port #0-1, 12-13, port #2-3, 14-15, port #4-5, 16-17) are multiplexed by length-4 FD OCC (FD-OCC #0-3). Between multiple DMRS CDM groups (3 DMRS CDM groups (CDM group #0-2)), 3 DMRS ports are multiplexed by FDM.

[0155] Figure 4B Further, as shown, in the case of the DMRS configuration of extended Type 2 and double-symbol DMRS, further, 12 DMRS ports (port #0-5, 12-17) can be used. Within each DMRS CDM group (CDM group #0-2), 4 DMRS ports (port #0-1, 12-13, port #2-3, 14-15, port #4-5, 16-17) are multiplexed by length-4 FD OCC (FD-OCC #0-3). Between multiple DMRS CDM groups (3 DMRS CDM groups (CDM group #0-2)), 3 DMRS ports are multiplexed by FDM. Further, two DMRS ports in the time direction are multiplexed by length-2 TD OCC (TD-OCC #0-1). That is, multiple (2) CDM groups with the same index are multiplexed by TDM.

[0156] Further, as shown, in the case of the DMRS configuration of extended Type 2 and double-symbol DMRS, further, 12 DMRS ports (port #0-5, 12-17) can be used. Within each DMRS CDM group (CDM group #0-2), 4 DMRS ports (port #0-1, 12-13, port #2-3, 14-15, port #4-5, 16-17) are multiplexed by length-4 FD OCC (FD-OCC #0-3). Between multiple DMRS CDM groups (3 DMRS CDM groups (CDM group #0-2)), 3 DMRS ports are multiplexed by FDM. Further, two DMRS ports in the time direction are multiplexed by length-2 TD OCC (TD-OCC #0-1). That is, multiple (2) CDM groups with the same index are multiplexed by TDM. Figure 4B ​​As shown, in the case of DMRS configuration extended type 2 and double symbol DMRS, further, DMRS ports of 12 (ports #6-11, 18-23) can be used. Within each DMRS CDM group (CDM group #0-2), 4 DMRS ports (ports #6-7, 18-19, ports #8-9, 20-21, ports #10-11, 22-23) are multiplexed by length-4 FD OCC (FD-OCC #0-3). Among the multiple DMRS CDM groups (3 DMRS CDM groups (CDM group #0-2)), 3 DMRS ports are multiplexed by FDM. Further, two DMRS ports in the time direction are multiplexed by length-2 TD OCC (TD-OCC #0-1). That is, multiple (2) CDM groups with the same index are multiplexed by TDM.

[0157] In Figure 4B In the extended type 2 shown, the DMRS ports corresponding to CDM group #0 are {ports #0, 1, 12, 13}, {ports #6, 7, 18, 19}, the DMRS ports corresponding to CDM group #1 are {ports #2, 3, 14, 15}, {ports #8, 9, 20, 21}, and the DMRS ports corresponding to CDM group #2 are {ports #4, 5, 16, 17}, {ports #10, 11, 22, 23}.

[0158] (DMRS port combination)

[0159] In the antenna port indication of DMRS ports for PDSCH with DMRS maximum length = 1 / 2 extended type 1 / extended type 2, all of the following several categories of port combinations are being studied to be able to be indicated.

[0160] (Category 1) Combination of multiple indices of existing ports (p = 0 to 7 for extended type 1, p = 0 to 11 for extended type 2).

[0161] (Category 2) Combination of multiple indices of new ports (p = 8 to 15 for extended type 1, p = 12 to 23 for extended type 2).

[0162] (Category 3) Combination of existing port indices and new port indices within at least one CDM group in DMRS maximum length = 1 (combination of at least one of maximum 4 ports starting with p = {0, 1, 8, 9}, p = {2, 3, 10, 11} for extended type 1, combination of at least one of maximum 4 ports starting with p = {0, 1, 12, 13}, p = {2, 3, 14, 15} for extended type 2). For maximum 4 ranks, only one CDM group is used. For more than 4 ranks, more than one CDM group can be used.

[0163] The DMRS port for PDSCH is determined by p+1000.

[0164] It is under study to support DMRS maximum length = 1 and rank = 5, 6, 7, 8 in the extended type 1 / extended type 2 DMRS port for PDSCH / PUSCH.

[0165] (MU-MIMO scheduling constraint)

[0166] For MU-MIMO, multiple DMRSs for multiple UEs are multiplexed. The multiple DMRSs can be CDMed using different OCC within one CDM group, and the multiple DMRSs can be FDMed using different subcarriers (Comb) across multiple CDM groups. In CDM, a problem (near-far problem) arises due to a difference in distance from the base station to the multiple UEs. If FD-OCC is used in a flat fading environment, no inter-code interference occurs, but if FD-OCC is used in a frequency selective fading environment, inter-code interference occurs, and the quality decreases. To prevent this, a MU-MIMO scheduling constraint (existing MU-MIMO scheduling constraint) is specified.

[0167] In addition, similarly, if TD-OCC is used in an environment where there is no change in the channel state in the time domain (stationary state), no inter-code interference occurs, and if TD-OCC is used in an environment where there is a change in the channel state in the time domain (mobile state), inter-code interference occurs, and the quality decreases.

[0168] For PDSCH using DMRS configuration type 1, the following MU-MIMO scheduling constraint is specified.

[0169] • In DMRS configuration type 1, in a case where a UE is scheduled one codeword (CW), and in the existing antenna port table for DMRS configuration type 1, in a case where the UE is allocated an antenna port mapping accompanied by an index {2, 9, 10, 11, 30}, or in a case where the UE is scheduled 2 CWs, the UE can also be assumed that the remaining orthogonal antenna ports are not associated with the transmission of PDSCH for other UEs.

[0170] For the case of number of DMRS CDM groups without data 1 and rank 1 (one DMRS port) indicated, there can also be no restriction within the same CDM group (one DMRS port of other UEs can also be CDMed with the DMRS port of this UE). For the case of number of DMRS CDM groups without data 1 and rank 2 (2 DMRS ports) indicated, since all DMRS ports within the same CDM group are indicated, no DMRS port of other UEs can be CDMed with the DMRS port of this UE within the same CDM group. For the case of number of DMRS CDM groups without data 2 and rank 3 (3 DMRS ports) indicated, since 3 DMRS ports out of 4 DMRS ports within 2 CDM groups are indicated, no DMRS port of other UEs can be CDMed with one DMRS port of this UE. For the case of number of DMRS CDM groups without data 2 and rank 4 (4 DMRS ports) indicated, since all DMRS ports within the same CDM group are indicated, no DMRS port of other UEs can be CDMed with the DMRS port of this UE within the same CDM group.

[0171] In case a UE is configured with Rel. 18 DMRS ports, the UE can also follow at least one of several restrictions below.

[0172] - Restriction 1

[0173] Apply existing MU-MIMO scheduling restrictions. This means that a large number of DMRS ports are not used for other UEs. For example, in case of rank > 4, 2 CW, Category 1 / 2 is used DMRS port combination, the free ports are not used for other UEs.

[0174] - Restriction 2

[0175] Update MU-MIMO scheduling restrictions. The UE can also follow at least one of several restrictions below.

[0176] - Restriction 2-1

[0177] No existing MU-MIMO scheduling restrictions. There can also be no MU-MIMO scheduling restrictions for Rel. 18 DMRS ports.

[0178] - Restriction 2-2

[0179] Import several new MU-MIMO scheduling restrictions.

[0180] - Restriction 2-3

[0181] Without MU-MIMO scheduling constraints across different multiple CDM groups, introduce new MU-MIMO scheduling constraints within one CDM group.

[0182] The MU-MIMO scheduling constraint in Constraint 1 can also be, in Extended Type 2, in a case where a DMRS port combination using two CDM groups #0 and #1 is indicated, a DMRS port within another CDM group #2 cannot be applied to other UEs.

[0183] The MU-MIMO scheduling constraint in Constraint 2-3 can also be, in Extended Type 2, in a case where a DMRS port combination using two CDM groups #0 and #1 is indicated, a DMRS port within another CDM group #2 can be allocated to other UEs.

[0184] (Analysis)

[0185] However, in a case where Rel. 18 DMRS ports are used, it is expected to control scheduling of PUSCH / PDSCH for one / two Codewords (CWs). However, there has not been sufficient research on the antenna port table and the like referred to in such a case. In the absence of clear provisions thereon, there are concerns that the communication throughput / communication quality will not be improved as appropriate.

[0186] Therefore, the inventors of the present application have conceived a control method in a case where Rel. 18 DMRS ports are specified.

[0187] Hereinafter, the embodiments related to the present disclosure will be described in detail with reference to the drawings. In addition, each of the following embodiments (for example, each case) can be used individually, or at least two of them can be combined and applied.

[0188] (Variations and the like)

[0189] In the present disclosure, "A / B" and "at least one of A and B" can also be rewritten with each other. Furthermore, in the present disclosure, "A / B / C" can also mean "at least one of A, B, and C".

[0190] In the present disclosure, activation, deactivation, indication (or designation (indicate)), selection (select), configuration, update, determination (determine), and the like can also be rewritten with each other. In the present disclosure, support, control, controllable, operation, operable, and the like can also be rewritten with each other.

[0191] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), configurations, and the like can be interchangeable with each other. In the present disclosure, Medium Access Control (MAC) Control Element (CE), update commands, activation / deactivation commands, and the like can be interchangeable with each other.

[0192] In the present disclosure, higher layer signaling can be, for example, any one of or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0193] In the present disclosure, MAC signaling can be, for example, using a MAC Control Element (CE), a MAC Protocol Data Unit (PDU), and the like. Broadcast information can be, for example, a Master Information Block (MIB), a System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (OSI), and the like.

[0194] In the present disclosure, physical layer signaling can be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0195] In the present disclosure, indexes, Identifiers (IDs), indicators, resource IDs, and the like can be interchangeable with each other. In the present disclosure, sequences, lists, sets, groups, clusters, subsets, and the like can be interchangeable with each other.

[0196] In the present disclosure, panel, panel group, beam, beam group, precoder, Uplink (UL) transmission entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, 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 relation group, Code Division Multiplexing (CDM) group, RS group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., RS resource, SRS resource), resource set (e.g., RS resource set), CORESET pool, Transmission Configuration Indication state (TCI state) for downlink (DL TCI state), TCI state for uplink (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, and the like can be mutually interchangeable.

[0197] In addition, CORESET pool and CORESET pool index can also be mutually interchangeable.

[0198] In the present disclosure, the notation such as "Rel.XX" indicates a version of 3GPP. Among them, the version number "XX" is an example, and other numbers can also be replaced.

[0199] In the present disclosure, DMRS, DL DMRS, UL DMRS, PDSCH DMRS, and PUSCH DMRS can also be mutually interchangeable.

[0200] In the present disclosure, RE, RB, and PRB can also be rewritten to each other.

[0201] In the present disclosure, orthogonal sequence, OCC, FD OCC, TD OCC can also be rewritten to each other.

[0202] In the present disclosure, DMRS port, antenna port, port, DMRS port index can also be rewritten to each other. In the present disclosure, DMRS CDM group, CDM group, DMRS group, DMRS CDM group(s) without data can also be rewritten to each other. In the present disclosure, antenna port indication and antenna port field can also be rewritten to each other. In the present disclosure, DMRS configuration type, DMRS type, and RRC parameter “dmrs-Type” can also be rewritten to each other. In the present disclosure, maximum length of DMRS, maximum symbol number of DMRS, symbol number of DMRS, and RRC parameter “maxLength” can also be rewritten to each other.

[0203] In the present disclosure, DMRS type 1 (or DMRS type = 1) can also mean that the RRC parameter “dmrs-Type” is not set (for example, the RRC parameter “dmrs-Type” is absent in the DMRS configuration (DMRS-DownlinkConfig information element / DMRS-UplinkConfig information element)), and can also mean that 1 (or type 1) is set as the RRC parameter related to the DMRS type.

[0204] In the present disclosure, maximum length of DMRS = 1 can also mean that the RRC parameter “maxLength” is not set (for example, the RRC parameter “maxLength” is absent in the DMRS configuration (DMRS-DownlinkConfig information element / DMRS-UplinkConfig information element)), and can also mean that 1 (or length 1 (len1)) is set as the RRC parameter related to the maximum length of DMRS.

[0205] In the present disclosure, CDM group list, port group list, and list can also be rewritten to each other. In the present disclosure, CDM group subset, port group subset, and group subset can also be rewritten to each other.

[0206] In the present disclosure, the rank, the transmission rank, the number of layers, the number of antenna ports can also be rewritten to each other. In addition, one codeword is applied, and the number of layers is 4 layers or less can also be rewritten to each other. Two codewords are applied, and the number of layers is more than 4 layers can also be rewritten to each other.

[0207] In the present disclosure, "transformation precoding is set" can also be rewritten to each other with "transformation precoding is set to be effective".

[0208] In addition, in the present disclosure, "has the ability of" can also be rewritten to each other with "supports / reports the ability of".

[0209] In the present disclosure, the table can also be rewritten to one or more tables.

[0210] In the present disclosure, STxMP, SiMPUL, simultaneous transmission using multiple panels, multiple panel simultaneous transmission, multiple panel simultaneous UL transmission can also be rewritten to each other. In addition, STxMP can also mean that multiple joint / UL TCI states, spatial relations, beams are indicated / set for one PUSCH / PUCCH / SRS. In the present disclosure, support, set / indicate can also be rewritten to each other. In the present disclosure, transmission power, output power can also be rewritten to each other. In the present disclosure, the decision based on the UE and the setting / indication based on the network (base station / gNB) can also be rewritten to each other.

[0211] In the present disclosure, UL panel, UE panel, (identical) antenna coherence group, UL / joint TCI, spatial relation, PL-RS, (identical) transmission destination TRP can also be rewritten to each other.

[0212] In the present disclosure, 8Tx, UL transmission of more than 4 layers / rank can also be rewritten to each other.

[0213] In the present disclosure, Rel.15 DMRS port, Rel.15 Type 1 / 2 DMRS port, existing DMRS port can also be rewritten to each other. In the present disclosure, Rel.18 DMRS port, Rel.18 extended Type 1 / 2 DMRS port, new DMRS port can also be rewritten to each other. In addition, Rel.18 DMRS port can also correspond to a DMRS port whose total number of ports is 2 times or more (for example, 2 times, 3 times, 4 times,...) compared to Rel.15 DMRS port.

[0214] In the present disclosure, DMRS in a case where utilization of Rel. 15 DMRS port is set or utilization of Rel. 18 DMRS port is not set (not activated) can also be referred to as Rel. 15 DMRS. In the present disclosure, DMRS in a case where utilization of Rel. 18 DMRS port is set (activated) can also be referred to as Rel. 18 DMRS. DMRS for Type 1 / 2 in Rel. 15 DMRS can also be referred to as Rel. 15 Type 1 / 2 DMRS, simply as Type 1 / 2 DMRS, and the like. DMRS for extended Type 1 / 2 in Rel. 18 DMRS can also be referred to as Rel. 18 extended Type 1 / 2 DMRS, simply as extended Type 1 / 2 DMRS, and the like.

[0215] In the present disclosure, Rel. 15 DMRS configuration type, DMRS configuration type, type can also be mutually overwritten. Rel. 18 DMRS configuration type, extended DMRS configuration type, extended type, e-type can also be mutually overwritten.

[0216] In the present disclosure, antenna port table, antenna port indication table can also be mutually overwritten. In the present disclosure, DMRS port combination, combination of DMRS ports, one or more DMRS ports corresponding to one value of the antenna port field can also be mutually overwritten.

[0217] In each embodiment, Rel. 18 DMRS port set and DMRS extended Type 1 / 2 set can also be mutually overwritten.

[0218] In the antenna port table of each embodiment, the value of the antenna port field, the number of DMRS CDM groups without data, the value of the DMRS port is an example, and other values can also be specified.

[0219] In the new antenna port table in the case of using Rel. 18 DMRS port, a part or all of the DMRS port combination within the existing antenna port table can also be reused. In this case, it can also be that, for DMRS extended Type 1, only DMRS ports within DMRS ports 0 to 7 are indicated, and for DMRS extended Type 2, only DMRS ports within DMRS ports 0 to 11 are indicated.

[0220] In each embodiment, regarding the application of multiple TCI states in the transmission and reception using multiple TRPs, mainly the method targeting two TRPs (i.e., the case where at least one of N and M is 2) is explained, but the number of TRPs can be three or more (multiple), and each embodiment corresponding to the number of TRPs can be applied. In other words, at least one of N and M can also be a number greater than 2.

[0221] Each embodiment can be applied to single-symbol DMRS and to double-symbol DMRS. Each of the following embodiments can be applied to DMRS configuration type 1 and to DMRS configuration type 2.

[0222] Each embodiment can be applied to DMRS spreading type 1 and to DMRS spreading type 2. Each embodiment can be applied to DMRS maximum length = 1 and to DMRS maximum length = 2.

[0223] In each embodiment, the MU-MIMO scheduling constraint, and the fact that the free (remaining) orthogonal DMRS port is not used for other UEs can also be overridden by each other.

[0224] (Wireless communication method)

[0225] The DMRS port of the PDSCH can also be specified by the antenna port field within the DCI format (for example, DCI format 1_1 / 1_2) for scheduling the PDSCH.

[0226] The DMRS port of the PUSCH can also be specified by the antenna port field within the DCI format (for example, DCI format 0_1 / 0_2) for scheduling the PUSCH.

[0227] The UE can also refer to a new antenna port table (which can also be referred to as an antenna port table, an antenna port indication table, etc.) to determine the antenna port corresponding to the value of the above-mentioned antenna port field.

[0228] In addition, the case where the UE utilizes Rel. 15 DMRS ports can also mean that for type 1, the antenna port index p = #0~7 is utilized (can be utilized), and for type 2, the antenna port index p = #0~11 is utilized (can be utilized). Furthermore, the case where the UE utilizes Rel. 18 DMRS ports can also mean that for type 1, the antenna port index p = #0~15 (or #8~15) is utilized (can be utilized), and for type 2, the antenna port index p = #0~23 (or #12~23) is utilized (can be utilized).

[0229] In addition, in the present disclosure, the port index for PDSCH / PUSCH DMRS can correspond to a number obtained by adding 1000 to the illustrated number (e.g., #1000), or can correspond to the illustrated number itself (e.g., #0). For the port index for PDSCH / PUSCH DMRS, the port index for PDSCH / PUSCH can correspond to a number obtained by adding or subtracting 1000 from the port index for PDSCH / PUSCH DMRS, or can be the same as the port index for PDSCH / PUSCH DMRS.

[0230] The above new antenna port table can also be a table for Rel.18 extended Type 1 / 2 DMRS ports. The above new antenna port table preferably includes, in the DCI codepoint (or table row entry), a combination of DMRS ports of at least one of the following Categories 1-3 with respect to the maximum number (which can also be referred to as the maximum length, and can also be given by the higher layer parameter maxLength) = 1 or 2:

[0231] • Category 1: Only legacy DMRS ports (DMRS ports specified until Rel.17. For eType1, p=#0~7, for eType2, p=#0~11),

[0232] • Category 2: Only new DMRS ports (DMRS ports additionally specified after Rel.18. For eType1, p=#8~15, for eType2, p=#12~23),

[0233] • Category 3: Legacy DMRS ports and new DMRS ports within at least one CDM group.

[0234] The combination of new DMRS ports of Category 2 can also be a combination obtained by adding X to the port indices in the combination of DMRS ports of Category 1. For example, X can be a number of 8 or more (e.g., 8) in the case of eType1, and a number of 12 or more (e.g., 12) in the case of eType2. The above X can be specified in advance in the standard, can be set to the UE by higher layer signaling, or can be determined based on the UE capability. The X can also be referred to as an offset indicator (offset index), or simply as an offset (offset amount).

[0235] The legacy DMRS ports and new DMRS ports of Category 3 can also correspond to the following combinations, for example:

[0236] • Rank number within a CDM group: 3 or 4.

[0237] • Index of CDM group: 0, 1 for eType1. 0, 1, 2 for eType2.

[0238] • The number of CDM groups without data: 1, 2 for eType1. 1, 2, 3 for eType2.

[0239] In addition, the legacy DMRS port of Category 3 and the new DMRS port can also not include all of the above combinations. For example, for the number of CDM groups without data corresponding to the legacy DMRS port of Category 3 and the new DMRS port, either one or both of 1 and 2 (corresponding code points) can be specified in the antenna port table for eType1, and any one or more of 1, 2, and 3 (corresponding code points) can be specified in the antenna port table for eType2.

[0240] In addition, the DMRS port of Category 3 can also be a legacy DMRS port and a new DMRS port of a specific rank (for example, rank 3 / 4) within the same CDM group.

[0241] In addition, the DMRS port of Category 3 can also include the following as a combination of a legacy DMRS port and a new DMRS port within at least one CDM group:

[0242] • For eType1, from p = {#0, 1, 8, 9}, or {#2, 3, 10, 11}, a maximum of 4 ports,

[0243] • For eType2, from p = {#0, 1, 12, 13}, {#2, 3, 14, 15}, or {#4, 5, 16, 17}, a maximum of 4 ports.

[0244] The above combinations can be applied at least to single TRP.

[0245] In Category 3, it can also be that, in the case where the rank is a maximum of 4, only one CDM group is used for each UE. It can also be that, in the case where the rank is 4 or more, multiple CDM groups are used for each UE.

[0246] In the following embodiments, examples of the antenna port table for PDSCH DMRS are shown, but the scope of the present disclosure is not limited thereto. For example, the antenna port table (of the configuration method) of the following embodiments can also be appropriately rewritten as the antenna port table (of the configuration method) for PUSCH DMRS.

[0247] For example, the DCI in the following embodiment can correspond to both a PDSCH DCI format (e.g., DCI format 1_1 / 1_2) and a PUSCH DCI format (e.g., DCI format 0_1 / 0_2).

[0248] Further, for the antenna port table for PUSCH DMRS, it is also possible to include only DMRS ports for one rank, unlike the antenna port table for PDSCH DMRS. The UE can be instructed of the number of ranks (number of layers) for PUSCH DMRS, for example, using the precoding information and the number of layers field.

[0249] In addition, the antenna port table of the following embodiment shows an example in which all of the above-described category 1-3 DMRS port combinations are included in any one DCI codepoint (or row entry of the table), but is not limited thereto. For example, an antenna port table that does not include at least one of the category 1, 2, and 3 DMRS port combinations can be constituted / utilized based on the contents of the present disclosure.

[0250] Further, in the present disclosure, the value (Value) of the antenna port field can also be rewritten as a row index.

[0251] Further, in the present disclosure, single TRP can also be rewritten as one transmission reception point, and multiple TRP can also be rewritten as multiple transmission reception points.

[0252] Further, in each of the antenna port tables of the embodiments shown below, (1) an antenna port table for single TRP (for indicating operation of single TRP) can include at least entries other than the entry represented by [ ]. Further, (2) an antenna port table for multiple TRP (for indicating operation of multiple TRP) can include the entry represented by [ ] in addition to the entries of the above-described antenna port table for single TRP. The entry represented by [ ] can be associated with a DMRS port (antenna port corresponding to multiple TRP) across CDM groups, for example.

[0253] That is, each of the antenna port tables shown below can be respectively defined by being divided by each of the above-described (1) (2), or by each category. In this case, the antenna port table to be used can be switched according to the scenario of application (single / multiple TRP, or any one of categories 1-3). By switching the number of rows of the antenna port table according to the scenario, the antenna port table can be indicated flexibly and efficiently. Further, the antenna port table can be defined as one table in which the above-described (1) (2) are aggregated.

[0254] Further, the switching of scenarios described above can also be implemented based on high layer signaling. The switching of scenarios can also not be implemented, and only the multi-TRP oriented antenna port table can be used. That is, the multi-TRP oriented antenna port table can also serve as the single-TRP oriented antenna port table.

[0255] Further, for the DMRS ports of PDSCH, it is not limited to being indicated by the antenna port field within the DCI format (e.g., DCI format 1_1 / 1_2) used to schedule the PDSCH, but can also be indicated by other existing fields, new DCI fields, or a combination of these fields and the antenna port field. Further, a new indicator can also be combined in the existing fields such as the Time Domain Resource Assignment / Allocation (TDRA) field, the Frequency Domain Resource Assignment / Allocation (FDRA) field, etc. to indicate the specific DMRS port.

[0256] Further, in the present disclosure, the single-TRP oriented antenna port table and the multi-TRP oriented antenna port table can be separately defined, or a common antenna port table can be defined. In either antenna port table, the size of the antenna port field contained in the DCI format 1_1 / 1_2 can also be different. In this case, the size of the single-TRP oriented antenna port field can be smaller than the multi-TRP oriented antenna port field. More specifically, for example, the size of the single-TRP oriented antenna port field can also be 4 bits, and the size of the multi-TRP oriented antenna port field can also be 5 bits.

[0257] The embodiments can be applied to the DMRS of PDSCH, and can also be applied to the DMRS of PUSCH. The PUSCH DMRS port index can also be denoted as p, and the PDSCH DMRS port index can also be denoted as p+1000. Further, p can also be replaced by the value (row index) in the table of the present disclosure. That is, in the table for PDSCH shown below, for the value (=p) within the table, the PDSCH DMRS port index can also be represented by p+1000. On the other hand, in the table for PUSCH, the value (=p) within the table can also directly represent the PUSCH DMRS port index.

[0258] In the following antenna port table of the present disclosure, the column of "Notes" is a supplementary explanation and can not be included in the table (can not be specified). Further, in the following antenna port table of the embodiment, all of the rows can not be specified for each category (a part of the rows can be omitted), and a row (combination) not described can be specified / added.

[0259] Further, in the antenna port table, the association between the combination of the DMRS port index, the number of DMRS CDM groups without data, the row index, and the corresponding entry (various values in the table) can also be different. That is, the order of the rows can also be exchanged.

[0260] Further, in the case where a part of the rows are omitted / deleted (not specified), the index of the row (Value: value) that follows can also be moved forward. More specifically, in the following description, the row including the value surrounded by [ ] can also be deleted from the table. In this case, the row index (row number) that follows the deleted column can also be moved forward (moved forward) in accordance with the amount of deletion. In this way, a part of the rows in the table can be omitted / deleted as needed, and thus the bit size (number of bits) required to indicate the table can be reduced. As a result, the DCI overhead can be reduced. This content is common in each of the following embodiments.

[0261] Further, in the present disclosure, for each of the antenna port tables, a part / all of the rows can be commonly indicated in the table for single-DCI multi-TRP and the table other than this (can be specified as a common table), or can be specified as separate tables.

[0262] Further, in the present disclosure, the UE can also assume that a row is added in the table for single-DCI-based multi-TRP. In the case where the row is added, it can be added at a specific position (for example, the last row of the table), or can be added at an arbitrary row.

[0263] The UE can also assume that the added row is indicated only in the case where single-DCI-based multi-TRP is applied. The case where single-DCI-based multi-TRP is applied can be the case where two activated TCI states are indicated for at least one TCI codepoint. In addition, the added row can not be limited to the case where single-DCI-based multi-TRP is applied and can be indicated regardless of whether single-DCI-based multi-TRP is applied.

[0264] Further, in the table for single-DCI based multi-TRP, all / part of the combination of DMRS ports corresponding to Category 3 can also be omitted / deleted. The deletion of DMRS ports of Category 3 can also be applied only in the case of a large number of rows of the table, for example, extended Type 11 and DMRS maximum length = 2. In the table for single-DCI based multi-TRP, it is preferable that each TRP uses DMRS ports of different CDM groups. On the other hand, for DMRS ports of Category 3, two TRPs necessarily use DMRS ports of the same CDM group, and thus there is no use case.

[0265] As to whether a specific row is added / omitted / deleted for the table, and whether it can be indicated that it can be set / instructed by higher layer signaling / physical layer signaling, or it can follow the UE capability.

[0266] <First Embodiment>

[0267] The first embodiment relates to an antenna port field for PDSCH.

[0268] [Embodiment 1.1]

[0269] In Embodiment 1.1, a case where DMRS type = extended Type 1 and DMRS maximum length = 1 is explained. Figure 5 An example of an antenna port table in the case of DMRS type = extended Type 1 and DMRS maximum length = 1 for PDSCH is shown.

[0270] In Figure 5 , the left side of the table corresponds to 4 layers or less, and is referred to in the case where one codeword of PDSCH is scheduled. The right side of the table corresponds to 5 layers or more, and is referred to in the case where two codewords of PDSCH are scheduled.

[0271] The antenna port table (of the left side) of this example includes DMRS port combinations including only Category 1 DMRS ports (existing ports), DMRS port combinations including only Category 2 DMRS ports (new ports), and DMRS port combinations including Category 3 DMRS ports (both existing ports and new ports).

[0272] The values (Value) of the antenna port field in the case of 1 codeword (1CW) of this example correspond to Category 1 for 0-11, Category 2 for 12-23, and Category 3 for 24-29.

[0273] The above X for the category 2 DMRS port in this example is X=8 (the DMRS port indexes corresponding to the values =12-23 of the antenna port field respectively correspond to the indexes obtained by adding 8 to all the DMRS port indexes corresponding to the values =0-11 of the antenna port field). This X can also be referred to as an offset indicator (offset index), or simply as an offset. In this case, the offset is represented by +8.

[0274] The DMRS port combination for the category 3 DMRS port in this example (corresponding to the values =24-29 of the antenna port field) includes only the DMRS ports within the same CDM group for rank 3 or 4.

[0275] Figure 5 The values (Value) =0-3 of the antenna port field in the case of 2 codewords (2CW) of the table correspond to ranks 5-8, respectively. Since the DMRS maximum length =1, the 2-codeword-oriented DMRS can be transmitted in 1 DMRS symbol.

[0276] In addition, the UE can also be set with information of the maximum number of codewords that can be scheduled by DCI from the base station (for example, the RRC parameter maxNrofCodeWordsScheduledByDCI), in the case where the information indicates a value greater than 1, and in the case where multiple specific fields (for example, the MCS field) are included in the DCI, it can also be judged to refer to the right side of the antenna port table.

[0277] In the combination of DMRS ports in the case of 1CW in embodiment 1.1 (left half of the table), specific row entries (which can also be referred to simply as entries), such as the entries represented by [ ] are specifically described. In addition, the values of the antenna port field, the values (Value), and the row indexes can also be overwritten with each other.

[0278] In Figure 5 In, the entries of the values (Value) =0-2, 12-14, 24-25 of the antenna port field can be associated with the number of DMRS CDM groups without data =1 (that is, meaning FDM of DMRS and data). According to this entry, even in MU-MIMO, the data and DMRS can be temporarily FDMed to maximize the throughput of the UE according to the traffic volume, etc. That is, these entries are not limited to SU-MIMO, and can also be applied to MU-MIMO.

[0279] The entries of the values (Value) =9-11, 21-23 of the antenna port field can be associated with the number of DMRS CDM groups without data =2. These entries can also correspond to ranks 3 / 4. These entries can also not be included in single-TRP.

[0280] For the entry corresponding to rank 3 / 4, there is already a value = 24-29, but by setting a different entry, it is possible to multiplex the UE efficiently in one CDM group. That is, multiplexing of UEs in different CDM groups makes it easier to ensure orthogonality than multiplexing of multiple UEs within the same CDM group.

[0281] On the other hand, in multi-TRP, it is possible to use DMRS ports of different CDM groups. In multi-TRP, it is assumed that there is a difference in reception power from each TRP. Therefore, in a case where orthogonality between DMRS ports is broken (in a case where frequency selectivity is strong, etc.), if the DMRS port of a TRP with relatively strong reception power interferes with the DMRS port of a TRP with relatively weak reception power, characteristic degradation can occur. Therefore, it is preferable that each TRP use DMRS ports corresponding to different CDM groups.

[0282] The entry of the value (Value) = 11 of the antenna port field can be associated with DMRS CDM group number = 2, DMRS port = {0, 2} with no data. According to this entry, it is useful regardless of single / multi-TRP. For example, in a case where this entry is selected, MU-MIMO is not applied (the free DMRS port is not used for other UEs), so the processing is simplified. In addition, for a UE using this entry (antenna port), other UEs cannot use the free DMRS port. Therefore, in the entry of value = 23 described later, the combination of DMRS port = {8, 10} can also not be specified. That is, the gNB can only indicate either of DMRS port = {0, 2}, {8, 10}, and cannot indicate respective DMRS ports to different UEs at the same time.

[0283] The entry of the value (Value) = 23 of the antenna port field can be associated with DMRS CDM group number = 2, DMRS port = {8, 10}, {9, 11} with no data. For example, in a case where DMRS port = {0, 1, 8} is indicated for a certain UE #1, and DMRS port = {2, 3, 10} is indicated for another UE #2, by simultaneously indicating DMRS port = {9, 11} for another UE #3, it is possible to effectively utilize orthogonal DMRS ports to the limit.

[0284] For example, in the entry of the value (Value) = 23 of the antenna port field, in the case of DMRS port = {8, 10} (for example, a case of 2+2=4 layers between two UEs), it is possible to multiplex with DMRS port = {0, 2}, {1, 3}, or {9, 11} of other UEs within the same CDM group.

[0285] Further, in the entry of the Antenna port field with Value = 23, in the case of DMRS ports = {9, 11} (for example, 3+3+2 = 8 layers among 3 UEs), it is possible to multiplex with DMRS ports = {0, 1, 8} and {2, 3, 10} of other UEs within the same CDM group.

[0286] Further, the entry of the Antenna port field with Value = 23 can also include either of DMRS ports = {8, 10} and DMRS ports = {9, 11}. Further, as described above, the entry of the Antenna port field with Value = 23 can also not be included in the table.

[0287] For the combination of DMRS ports for each rank in the case of 2CW in Embodiment 1.1 (right half of the table), at least one of the following combinations can also be specified:

[0288] • For rank 5, the combination of port indexes {0, 1, 2, 3, 8},

[0289] • For rank 6, the combination of port indexes {0, 1, 2, 3, 8, 10},

[0290] • For rank 7, the combination of port indexes {0, 1, 2, 3, 8, 9, 10},

[0291] • For rank 8, the combination of port indexes {0, 1, 2, 3, 8, 9, 10, 11}.

[0292] Further, the combination of DMRS ports in the case of 1CW in the first embodiment (left half of the table) can include a different combination from the above example, and at least one of the following combinations can be specified for each rank:

[0293] • For rank 1, the combination of 1 index from among the port indexes {0, 1, 2, 3, 8, 9, 10, 11},

[0294] • For rank 2, the combination of 2 indexes from among the port indexes {0, 1, 2, 3, 8, 9, 10, 11},

[0295] • For rank 3, the combination of 3 indexes from among the port indexes {0, 1, 2, 3, 8, 9, 10, 11},

[0296] • For rank 4, the combination of 4 indexes from among the port indexes {0, 1, 2, 3, 8, 9, 10, 11}.

[0297] Here, the above "port index {0, 1, 2, 3, 8, 9, 10, 11}" can also be mutually rewritten as "one of a first set (for example, {0, 1, 2, 3}) and a second set (for example, {8, 9, 10, 11})". The first / second set can be predetermined in the standard, can be set to the UE by higher layer signaling, and can be determined based on the UE capability. As for which to select the index from the first and second sets, it can be predetermined in the standard, can be set to the UE by higher layer signaling, and can be determined based on the UE capability.

[0298] Variation of the embodiment 1.1

[0299] Figure 6 is a variation of the table of the antenna port in the case of DMRS type = extended type 1 and DMRS maximum length = 1 for PDSCH. Figure 6 represents an entry for single-DCI-based multi-TRP, and can be added to the table of Figure 5 , or can be separately specified as a table for single-DCI-based multi-TRP (professional) independently of Figure 5

[0300] As shown in Figure 6 , in the entry with value = 30, the number of DMRS CDM groups = 2 and DMRS ports = {0, 2, 3} without data can also be associated.

[0301] In the table of Figure 5 , the combination of DMRS ports = {0, 1, 2} is supported in the entry with value = 9, and the combination of DMRS ports = {8, 9, 10} is supported in the entry with value = 21. Thus, 2 + 1 = 3 layers based on two CDM groups can be indicated. On the other hand, in the entry with value = 30 shown in Figure 6 , by supporting DMRS ports = {0, 2, 3}, 1 + 2 = 3 layers based on two CDM groups can be indicated.

[0302] Embodiment 1.2

[0303] In the embodiment 1.2, the case of DMRS type = extended type 1 and DMRS maximum length = 1 is described. In the embodiment 1.2, the same (or also controlled / configured / adjusted, etc.) as the embodiment 1.1 can also be described. Figure 7 and Figure 8 represents an example of a table of the antenna port in the case of DMRS type = extended type 1 and DMRS maximum length = 2 for PDSCH.

[0304] ​Furthermore, the antenna port table involved in Implementation Method 1.2 has a row count relationship that spans... Figure 7 and Figure 8 These two diagrams illustrate this. That is, in this example, let's say... Figure 7 and Figure 8 The two graphs are merged and defined as a single table. More specifically, let's say it's in... Figure 7 The bottommost segment (value = 42) is directly below the following... Figure 8 The explanation will focus on the top section (value = 43). Furthermore, as mentioned above, Figure 7 and Figure 8 The table shown is just one example; you can also specify a table that is segmented according to the application scenario (single TRP / multiple TRP, or any of categories 1 to 3).

[0305] First, regarding 1CW ( Figure 7 as well as Figure 8 The left half of the table will be used to describe the row entries. In the antenna port table shown in this example, the value of 1CW = 0-11 can also correspond to... Figure 5 The value can be 0-11. Alternatively, values ​​of 0-30 correspond to Category 1, 31-61 to Category 2, and 62-67 to Category 3. Furthermore, in Category 3, with a maximum rank of 4, only one CDM group can be used per UE.

[0306] Figure 5 The value (value) = 12-14 can also correspond to the value = 31-33 in this example. Figure 5 The value = 21-22 can also correspond to the value = 40-41 in this example. Figure 5 The value = 24-25 can also correspond to the value = 62-63 in this example.

[0307] In this example, the value is 12 - 30 (corresponding to...) Figure 7 ), 43-61 (corresponding to Figure 8 The entries are for Figure 5 The newly added row entries. That is, entries with values ​​of 12-30 and 43-61 represent the case where the number of preceding code elements is 2. For other values, the number of preceding code elements can be 1.

[0308] The value 43-61 in this example can also be associated with a DMRS without data, CDM group number = 2, and preamble number = 2. Within these line entries, multiple DMRS ports can be represented using DMRS of length 2 within the same CDM group.

[0309] Since values = 0-2, 31-33, 62-63 are associated with the number of DMRS CDM groups without data = 1, the overhead of DMRS can be reduced. For example, this row can be mainly used in the SU-MIMO scenario to improve the throughput of the UE. On the other hand, even in the MU-MIMO scenario, the gNB does not always find good pairs of UEs for MU-MIMO. Therefore, the gNB sometimes schedules the PDSCH through SU-MIMO. In order to be able to cope with that situation, this row is effective.

[0310] For the entry denoted by [ ] as values = 30, 40-42, since values = 62-67 corresponding to Category 3 are supported, it can also not be specified (for example, it can be deleted in the case of single TRP). In the case where this entry is deleted, it can be indicated by the 6-bit antenna port field.

[0311] According to the entry of value = 42, it is possible to multiplex the DMRS port = {0, 2}, {1, 3}, or {9, 11} of other UEs within the same CDM group (for example, the case of 2+2=4 layers between two UEs). However, in the case where DMRS port = {0, 2} is indicated in value = 11, other DMRS ports will not be used for other UEs. Therefore, the entry of value = 42 does not necessarily have to be specified (it can be deleted).

[0312] Values = 26-29, 57-60 are effective in the case of multiplexing two UEs of ranks 3-4 to different CDM groups in the two-symbol DMRS.

[0313] Next, the row entries of the right half of 2CW ( Figure 7 ) are explained. Figure 5 Values = 0-4 of 2CW ( ) can also correspond to values = 4-7 of the present example. Values = 0-4, 8-19 of the present example are newly added row entries. That is, the entries of values = 0-4, 8-19 indicate the case where the number of preamble symbols is 2. On the other hand, the entries of values = 4-7 indicate the case where the number of preamble symbols is 1.

[0314] In 2CW, the entries of values = 0-7, 12-19 can also be associated with the number of DMRS CDM groups without data = 2. On the other hand, the entries of values = 8-11 can also be associated with the number of DMRS CDM groups without data = 1.

[0315] In 2CW, the entries of values = 0-3 correspond to ranks 5-8, respectively. Similarly, the entries of values = 8-11, 12-15, 16-19 can also correspond to ranks 5-8, respectively.

[0316] In 2CW, based on entries with values ​​of 8-19, it is possible to allocate (map) ports so that the number of ports in each of the multiple CDM groups is equal or the difference in the number of ports is reduced.

[0317] For example, with a value of 8, when the DMRS port is indicated as {0, 1, 4, 5, 8}, as... Figure 4A As shown, in the two CDM groups #0 of TDM, DMRS ports corresponding to TD-OCC#0 = {0, 1, 8} and DMRS ports corresponding to TD-OCC#1 = {4, 5} can be assigned.

[0318] In this way, ports are allocated among multiple CDM groups being TDM-compliant (CDM groups with the same index) to ensure that the number of ports corresponding to a UE is equal or the difference is minimized. Additionally, in the example of value = 8, since the rank is 5, which is odd, ports can be allocated among the multiple TDM-compliant CDM groups to minimize the difference in the number of ports for each group. For example, when the rank is 6, which is even, ports can be allocated among the multiple TDM-compliant CDM groups to ensure that the number of ports for each group is equal.

[0319] In this way, DMRS ports are indicated in a way that minimizes the difference in the number of ports, thereby improving performance in situations involving high-speed movement or high frequency selectivity (where the aforementioned distance-to-port ratio issues may occur). Imagine that the orthogonality of TD-OCC is disrupted during high-speed movement. Imagine that the orthogonality of FD-OCC is disrupted in channels with high frequency selectivity. By indicating DMRS ports in a way that minimizes the difference in the number of ports, FD-OCC and TD-OCC can be applied equally. Furthermore, extreme performance degradation can be avoided even in situations involving high-speed movement or channels with high frequency selectivity. Furthermore, DMRS overhead can be reduced.

[0320] Variations of [Implementation Method 1.2]

[0321] Figures 9A-9B This indicates a variant of the antenna port table for the case where DMRS type = Extended Type 1 and DMRS maximum length = 2 for PDSCH. Figures 9A-9B This indicates an entry for multiple TRPs based on a single DCI, which can be appended to. Figure 7 as well as Figure 8 In the table, it can also be with Figure 7 as well as Figure 8 Each is independently defined as a table for multiple TRPs (dedicated) based on a single DCI.

[0322] In the case where DMRS type = extended type 1 and DMRS maximum length = 2, for example, in the above... Figure 7The entry of the value (Value) = 31 of the antenna port field in the table can also be defined (may also be replaced) as shown in Figure 9A In the above-mentioned Figure 9A , the number of data-less DMRS CDM groups = 2 and DMRS ports = {0, 2, 3} can be associated.

[0323] For example, in the entry of the value (Value) = 9, 40 of the antenna port field in the above-mentioned Figure 7 , the combination of DMRS ports = {0, 1, 2}, {8, 9, 10} is supported. Thus, 2 + 1 = 3 layers based on two CDM groups can be indicated. On the other hand, in the entry of the value (Value) = 31 of the antenna port field, 1 + 2 = 3 layers based on two CDM groups can be indicated by supporting DMRS ports = {0, 2, 3}.

[0324] Further, in the above-mentioned Figure 8 table, for the case of single-DCI based multi-TRP, an entry of the value (Value) = 68 of the antenna port field as shown in Figure 9B may also be defined (may also be added). In the above-mentioned Figure 9B , in the entry of the value = 68, the number of data-less DMRS CDM groups = 2 and DMRS ports = {0, 2, 3} can also be associated. As with the above, by supporting DMRS ports = {0, 2, 3}, 1 + 2 = 3 layers based on two CDM groups can be indicated thereby.

[0325] [Embodiment 1.3]

[0326] In Embodiment 1.3, the case of DMRS type = extended Type 2 and DMRS maximum length = 1 is described. In addition, in Embodiment 1.3, the same (or may also be controlled / configured / adjusted, etc.) as Embodiment 1.1 / 1.2 can not be repeatedly described. Figure 10 and Figure 11 indicate an example of an antenna port table for the case of DMRS type = extended Type 2 and DMRS maximum length = 1 for PDSCH.

[0327] In the antenna port table of Embodiment 1.3, the difference between the indices of the category 1 DMRS port and the category 2 DMRS port may, for example, be +12, and the number of data-less CDM groups can be 1 to 3. That is, the offset indicator (offset amount indicator) of the category 2 with respect to the category 1 can be +12.

[0328] In addition, the antenna port table related to Embodiment 1.3 is related to the number of rows across Figure 10 and Figure 11These two figures are shown. That is, in the present example, Figure 10 and Figure 11 Two figures are merged to be defined as one table. More specifically, it is defined as in Figure 10 the immediately below of the lowermost row (value = 26) of Figure 11 the uppermost row (value = 27) of Figure 10 and Figure 11 The table shown in the above is only an example, and a table divided according to the application scenario (single / multi-TRP, or any one of categories 1 to 3) can also be defined.

[0329] First, the row entries of 1CW (left half of Figure 10 and Figure 11 are explained. In the antenna port table shown in the present example, values = 0 to 10 of 1CW can correspond to values = 0 to 10 of Figure 5

[0330] It can also be that values (value) = 0 to 23 correspond to category 1, 24 to 47 to category 2, and 48 to 59 to category 3. In addition, in category 3, either all combinations of DMRS CDM group numbers = 1 to 3 with no data can be included, or a part of the combinations can be omitted. For example, it can also be that, in the case of a DMRS CDM group number = 1 with no data, combinations of DMRS ports in the amount of 1 CDM group are defined, in the case of a DMRS CDM group number = 2 with no data, combinations of DMRS ports in the amount of 2 CDM groups are defined, and in the case of a DMRS CDM group number = 3 with no data, combinations of DMRS ports in the amount of 3 CDM groups are defined.

[0331] Figure 5 The entries shown in [ ] of

[0332] Figure 5 Values (value) = 0 to 2 of Figure 5 Values = 12 to 14 of Figure 5 Values = 24 to 25 of

[0333] Figure 5 Values (value) = 9 to 10 of Figure 5 Values = 21 to 22 of

[0334] Figure 5 ​The value = 11 of the present example can correspond to the value = 23 of the present example. Figure 5 The value = 23 of the present example can correspond to the value = 47 of the present example.

[0335] The entries of the value = 11-22, 35-46 of the present example can also be associated with the DMRS CDM group number = 3 with no data. Among the values other than these, the DMRS CDM group number = 1 / 2 with no data can also be associated.

[0336] For example, in a case where the value = 23 is indicated in the existing specification, MU-MIMO is not applied (the other DMRS ports are not used for other UEs), and therefore the value = 47 can also be excluded (deleted).

[0337] Further, in the case of single TRP, all / at least one of the entries of the value = 33-34, 44-47 can also be deleted. Thereby, the overhead of DMRS can be reduced. For example, in a case where the row of the value = 23 is indicated, the other DMRS ports will not be used for other UEs. Therefore, if the existing rule is followed, the value = 47 corresponding to the value = 23 can also be deleted (may not be specified). As described later, the row of the value = 23, 47 can also be applied to the MU-MIMO scheduling constraint.

[0338] Next, the row entries of the right half of the 2CW ( Figure 10 In the 2CW, the value = 0-3, 8-11 of the present example can be associated with the DMRS CDM group number = 3 with no data. Further, the value = 4-7 of the present example can be associated with the DMRS CDM group number = 2 with no data. These row entries can be associated with the rank 5-8.

[0339] Either of the value = 0-3, 4-7 can be specified, or both can be specified. For example, in the case of the value = 0-3, by setting the DMRS CDM group number = 2 with no data, it is possible to use MU-MIMO, FDM one CDM group with data, and it is possible to improve the throughput of the UE. On the other hand, in the case of the value = 4-7, by setting the DMRS CDM group number = 3 with no data, it is possible to allocate one CDM group to other UEs, and it is possible to improve the cell capacity.

[0340] In the 2CW, according to the entries of the value = 4-11, it is possible to perform allocation (mapping) so that the number of ports of each of the plurality of CDM groups is equal or the difference in the number of ports is small.

[0341] For example, in the value = 4, in a case where the DMRS port = {0, 1, 2, 3, 12} is indicated, as Figure 4BAs shown, in the two CDM groups #0, 1 being FDMed, the DMRS ports = {0, 1, 12} and {2, 3} corresponding to TD-OCC #0 can be respectively allocated.

[0342] Thus, among the multiple CDM groups being TDMed (among the CDM groups having the same index), the number of ports corresponding to a certain UE can be allocated so as to be equal or the difference thereof to be small. In addition, in the example of the value = 4, since the rank number is 5 which is an odd number, among the multiple CDM groups being TDMed, it can be allocated so as to be small in the difference of the number of ports (3 and 2) of each.

[0343] For example, in the value = 5, in the case where the DMRS ports = {0, 1, 2, 3, 12, 14} are indicated, as Figure 4B As shown, in the two CDM groups #0, 1 being FDMed, the DMRS ports = {0, 1, 12} and {2, 3, 14} corresponding to TD-OCC #0 can be respectively allocated. Thus, in the case where the rank number is 6 which is an even number, among the multiple CDM groups being TDMed, the number of ports of each is equally allocated (3 per group).

[0344] Variation of Embodiment 1.3

[0345] Figures 12A-12B Variation of the table of the antenna port in the case of the DMRS type = extended Type 2 and the DMRS maximum length = 1 for PDSCH is shown. Figures 12A-12B Entries facing the single-DCI-based multi-TRP can be added to the tables of Figure 10 and Figure 11 The tables of Figure 10 and Figure 11 may be respectively independently specified as tables facing the single-DCI-based multi-TRP (dedicated).

[0346] In the case of the DMRS type = extended Type 2 and the DMRS maximum length = 1, for example, in the above-mentioned table of Figures 10-11 The entry of the value (Value) = 24 of the antenna port field can also be specified as shown in Figure 12A (or can be replaced). In Figure 12A , the number of DMRS CDM groups without data = 2 and the DMRS ports = {0, 2, 3} can be associated.

[0347] For example, in the above-mentioned table of Figures 10-11Value = 9, in the entry of Value = 33, the combination of DMRS port = {0, 1, 2}, {12, 13, 14} is supported. Thus, it is possible to indicate 2 + 1 = 3 layers based on two CDM groups. On the other hand, in the entry of Value = 24 of the antenna port field, by supporting DMRS port = {0, 2, 3}, it is thereby possible to indicate 1 + 2 = 3 layers based on two CDM groups.

[0348] Further, in the above-described Figures 10-11 table, for the case of single-DCI based multi-TRP, it is also possible to stipulate (may also be added) Figure 12B the entry of Value = 60 of the antenna port field as illustrated. In Figure 12B Value = 60, the number of DMRS CDM groups without data = 2 and DMRS port = {0, 2, 3} can be associated. As with the above, by supporting DMRS port = {0, 2, 3}, it is thereby possible to indicate 1 + 2 = 3 layers based on two CDM groups.

[0349] [Embodiment 1.4]

[0350] In Embodiment 1.4, the case of DMRS type = extended Type 2 and DMRS maximum length = 2 is described. In addition, in Embodiment 1.4, it is also possible to be the same as Embodiment 1.1 / 1.2 / 1.3 (or it is also possible to be controlled / configured / adjusted, etc. as well) and the content is not repeated. Figures 13-15 represents an example of an antenna port table in the case of DMRS type = extended Type 2 and DMRS maximum length = 2 for PDSCH.

[0351] In the antenna port table of Embodiment 1.4, it is also possible to include a DMRS port combination including only a category 2 DMRS port. This combination may, for example, correspond to a DMRS port combination obtained by adding X (for example, +12) to all of the indices of at least one of the DMRS port combinations including only the above-described category 1 DMRS port.

[0352] In addition, the antenna port table related to Embodiment 1.4 is across Figures 13-15 the three figures in terms of the number of rows. That is, in this example, Figures 13-15 the three figures are merged to stipulate one table. More specifically, it is stipulated that Figure 13 the lowermost row (Value = 43) of is followed by Figure 14 the uppermost row (Value = 44) of, and Figure 14 the lowermost row (Value = 81) of is followed by Figure 15 the uppermost row (Value = 82) of is described. In addition, as described above, Figures 13-15The table shown is just one example; tables can also be specified to be segmented according to the application scenario (single TRP / multiple TRP, or any of categories 1 to 3).

[0353] First, regarding 1CW ( Figures 13-15 The left half of the table will be used to describe the row entries. In the antenna port table shown in this example, the value of 1CW = 0-10 can correspond to... Figure 5 The value is 0-10.

[0354] Alternatively, values ​​of 0-57 can correspond to category 1, 58-115 to category 2, and 116-127 to category 3. Furthermore, category 3 can encompass all combinations of DMRS CDM groups with no data (numbers 1-3), or it can omit some combinations. For example, it could specify a combination of DMRS ports for one quantity in a single CDM group when there is one DMRS CDM group with no data; a combination of DMRS ports for two quantities in a single CDM group when there is two DMRS CDM groups with no data; and a combination of DMRS ports for three quantities in a single CDM group when there is three DMRS CDM groups with no data.

[0355] Figure 5 The entries shown in brackets [ ] can also represent entries corresponding to the following values ​​in this example. The entries shown in brackets [ ] can also represent DMRS ports across antenna ports / CDM groups corresponding to multiple TRPs.

[0356] Figure 5 The value (value) = 0-2 can correspond to the value = 0-2 in this example. Figure 5 The value = 12-14 can correspond to the value = 58-60 in this example. Figure 5 The value 24-25 can correspond to the value 116-117 in this example.

[0357] Figure 5 The value (value) = 9-10 can correspond to the value = 9-10 in this example. Figure 5 The value 21-22 can correspond to the value 67-68 in this example.

[0358] For example, in the existing specification, if value = 23 is indicated, MU-MIMO is not applied (other DMRS ports are not used for other UEs), so value = 81 can also be excluded (deleted). As will be discussed later, rows with values ​​= 23 and 81 can also be subject to MU-MIMO scheduling constraints.

[0359] Further, in the case of single TRP, all / at least one of the entries of value = 67-68, 78-80 can also be deleted. For example, value = 67-68, 78-80 can also be deleted because it is beneficial for minimizing the overhead of DMRS for value = 116-117. By deleting several entries, it is possible to suppress the bit size to, for example, 7 bits. Thereby, it is possible to reduce the overhead of DMRS.

[0360] For value = 42-47, 100-105, in dual-symbol DMRS, it is effective in the case where two UEs of rank 3-4 are multiplexed to different CDM groups.

[0361] Next, the row entries of the right half of 2CW (2CW) Figure 13 In 2CW, value = 0-1, 10-13, 26, 37, 42-43 of the present example can be associated with DMRS CDM group number = 3 with no data. Further, value = 2-9, 18-25, 38-41 of the present example can be associated with DMRS CDM group number = 2 with no data. The entries other than this (value = 14-17) can be associated with DMRS CDM group number = 1 with no data. All of the row entries of 2CW can be associated with rank 5-8.

[0362] In 2CW, according to the entries of value = 14-37, in the combination of DMRS ports using one CDM group, it is possible to reduce the overhead.

[0363] In 2CW, according to the entries of value = 6-13, 14-37, it is possible to perform allocation (mapping) so that the number of ports of each of a plurality of CDM groups is equal or the difference in the number of ports is small.

[0364] For example, in value = 7, in the case where DMRS ports = {0, 1, 2, 3, 12, 14} are indicated, as shown in Figure 4B in two CDM groups #0, 1 which are FDMed, it is possible to allocate DMRS ports = {0, 1, 12} and {2, 3, 14} corresponding to TD-OCC #0 and TD-OCC #1, respectively, equally by three per group.

[0365] For example, in value = 15, in the case where DMRS ports = {0, 1, 6, 7, 12, 18} are indicated, as shown in Figure 4B in two CDM groups #0 which are TDMed, it is possible to allocate DMRS ports = {0, 1, 12} corresponding to TD-OCC #0 and DMRS ports = {6, 7, 18} corresponding to TD-OCC #1, respectively, equally by three per group.

[0366] For example, in the case of value = 23, in the case where DMRS port = {2, 3, 8, 9, 14, 20} is indicated, as shown in Figure 4B , in two CDM groups #1 which are TDMed, DMRS port = {2, 3, 14} corresponding to TD-OCC #0 and DMRS port = {8, 9, 20} corresponding to TD-OCC #1 can be allocated equally three per group, respectively.

[0367] Thus, in the case where the rank number is 6 which is even, the number of ports per group can be allocated equally (three per group) among the plurality of CDM groups which are TDMed.

[0368] Further, for example, in the case of value = 14, in the case where DMRS port = {0, 1, 6, 7, 12} is indicated, as shown in Figure 4B , in two CDM groups #0 which are TDMed, DMRS port = {0, 1, 12} and {6, 7} corresponding to TD-OCC #0 can be allocated.

[0369] Thus, among the plurality of CDM groups which are TDMed (among the CDM groups having the same index), the number of ports corresponding to a certain UE is allocated so as to be equal or the difference thereof is made small. Further, in the example of value = 14, since the rank number is 5 which is odd, among the plurality of CDM groups which are TDMed, the number of ports per group can be allocated so as to be small (3 and 2).

[0370] Further, all / one or more of the entries of value = 38-43 can be deleted. Thereby, the overhead of DMRS can be reduced.

[0371] Variation of Embodiment 1.4

[0372] Figures 16A-16B Variation of the table indicating the antenna port in the case of DMRS type = extended Type 2 and DMRS maximum length = 2 for PDSCH. Figures 16A-16B Entries facing single-DCI-based multi-TRP can be added to the table of Figures 13-15 , and Figures 13-15 may be respectively independently defined as tables facing single-DCI-based multi-TRP (dedicated).

[0373] In the case of DMRS type = extended Type 2 and DMRS maximum length = 2, for example, in the above-described table of Figures 13-15 , the entry of value (Value) = 58 of the antenna port field can also be defined as shown in Figure 16A (or can be replaced). In Figure 16AIn the entry of the value (Value) = 128 of the antenna port field as shown in Table 1, the number of DMRS CDM groups without data = 2 and DMRS ports = {0, 2, 3} can be associated. As with the above, by supporting DMRS ports = {0, 2, 3}, 1 + 2 = 3 layers based on two CDM groups can be indicated.

[0374] For example, in the entry of the value (Value) = 9 of the antenna port field as described above Figures 13-15 , a combination of DMRS ports = {0, 1, 2} is supported. Thus, 2 + 1 = 3 layers based on two CDM groups can be indicated. On the other hand, in the entry of the value (Value) = 58 of the antenna port field, by supporting DMRS ports = {0, 2, 3}, 1 + 2 = 3 layers based on two CDM groups can be indicated.

[0375] Further, in the table of the above Figures 13-15 , in order to the case of single-DCI based multi-TRP, it can also be possible to specify (may also be added) Figure 16B the entry of the value (Value) = 128 of the antenna port field as shown in Table 1. In the entry of the value = 128 Figure 16B , the number of DMRS CDM groups without data = 2 and DMRS ports = {0, 2, 3} can be associated. As with the above, by supporting DMRS ports = {0, 2, 3}, 1 + 2 = 3 layers based on two CDM groups can be indicated.

[0376] <Variant>

[0377] In the first embodiment, as explained in Embodiments 1.1-1.4, the number of entries constituting the antenna port table, the antenna port field for indicating the DMRS port can become large. Thus, the DMRS port can also be indicated based on not only the antenna port field but also other information.

[0378] For example, the DMRS port can also be indicated using both the CDM group subset and the antenna port field. Here, the CDM group subset can be a lower-order constituent element of the CDM group, and one CDM group can contain multiple CDM group subsets. The CDM group subset can be set to the UE by a higher layer parameter (e.g., RRC signaling, MAC CE) in association with the PDSCH / PUSCH, or can be designated by the DCI that schedules the PDSCH / PUSCH. The CDM group subset can be identified by a CDM group subset ID.

[0379] The order of the CDM group in the antenna port table can also be reused per CDM group subset. For example, in the case where the antenna port table indicates the DMRS port index j for the first CDM group subset, for the second CDM group subset, a table in which the DMRS port index j in the DMRS port table is rewritten as j + P can also be used. Here, P can be the number of DMRS ports within the CDM group subset (the maximum number of DMRS ports within the CDM group subset).

[0380] In the first embodiment, the categories 1 / 2 / 3 can all be specified in the antenna port table, or only a part can be specified.

[0381] For example, reducing the size of the antenna port field can also be set to the UE by a higher layer parameter. By reducing the size of the antenna port field, reduction in the overhead of the DCI can be expected.

[0382] In addition, in the case where the higher layer parameter indicating that the size of the antenna port field of the DCI is reduced compared to the specification of Rel. 17 NR is set to the UE, based on the rule set or decided in advance by RRC, the table after selecting one or more combinations of DMRS ports from a specific antenna port table (for example, the antenna port table in the case where the higher layer parameter indicating that the size of the antenna port field of the DCI is increased compared to the specification of Rel. 17 NR is set) is used.

[0383] Further, the row that can be indicated by the DCI (for example, DCI format 1_1 / 1_2) from the above-described antenna port table can also be instructed / set / restricted by RRC / MAC CE. Further, in the DCI format 1_1 and the DCI format 1_2, a specific DMRS port can also be instructed based on different rules. For example, it can be that the row that can be instructed from the table is instructed by the DCI format 1_1, and the row that can be deleted / omitted is instructed by the DCI format 1_2. Thereby, the overhead of the DCI can be reduced.

[0384] For example, the DMRS port can also be instructed by the bitmap (1 bit or a plurality of bits) of each row of the antenna port table, or in units of subsets after grouping (which can also be referred to simply as grouping) each row as described above. The rule of grouping can be determined in advance by the specification, or can be every specific number of rows of the above-described table, every category, every rank number, every number of DMRS CDM groups without data, and the like. It can be that a plurality of rows are grouped, and the DMRS port that can be instructed is instructed by the DCI for each group. Thereby, the overhead of the RRC / MAC CE can be reduced.

[0385] Further, the row that can be instructed / set / restricted by RRC / MAC CE is not limited to a part of the rows in the table. That is, it can be that the rows other than these limited rows can be instructed by the DCI. Further, it can be that the row that can be instructed by the DCI is instructed / set / restricted by RRC / MAC CE for each of the above-described subsets (groups consisting of a plurality of rows).

[0386] According to the first embodiment described above, the UE can appropriately judge the Rel. 18 PDSCH DMRS port to be utilized.

[0387] <Second Embodiment>

[0388] The second embodiment relates to MU-MIMO scheduling restriction.

[0389] Hereinafter, the above-described each antenna port table is exemplified for MU-MIMO scheduling restriction. Embodiments 2.1-2.4 shown below respectively correspond to the above-described embodiments 1.1-1.4.

[0390] In this example, for supporting the above-described example, MU-MIMO scheduling restriction between multiple DMRS ports of extended Type 1 / extended Type 2 within one CDM group / within multiple CDM groups is explained.

[0391] For example, in the case of DMRS Type = extended Type 1 / extended Type 2, in the case where the UE is scheduled 1 CW and is allocated an antenna port mapping with a specific index in the new antenna port table (the above-described each antenna port table), the UE can also be assumed that the remaining all orthogonal antenna ports are not associated with the transmission of PDSCH to other UEs.

[0392] Here, the specific index in the new antenna port table can also correspond to the entry of the row index shown in the condition described later. That is, the above-described assumption of the UE can be rewritten to MU-MIMO scheduling restriction based on a certain condition.

[0393] Further, the above-described "remaining all orthogonal antenna ports" can mean DMRS ports within the same CDM group (one CDM group) or can mean DMRS ports within multiple CDM groups.

[0394] Further, in 2 CW, MU-MIMO scheduling restriction can be applied or can not be applied.

[0395] The UE can also control the above-described scheduling restriction (whether to make the above-described assumption) based on the kind of extended type (extended Type 1 / extended Type 2), the DMRS maximum length (1 / 2), whether to apply single-DCI-based multi-TRP, the number of CWs (1 CW / 2 CW) in the case of applying DMRS Type = extended Type 1 / extended Type 2.

[0396] For example, in the row (value) indicating the combination of the following DMRS ports, the UE can also assume that the remaining DMRS ports within the same CDM group / multiple CDM groups are not used for other UEs.

[0397] • All of the DMRS ports within a CDM group are allocated to a certain UE (e.g., extended Type 1 DMRS ports = {0, 1, 8, 9}, extended Type 2 DMRS ports = {0, 1, 12, 13}).

[0398] • DMRS ports corresponding to 2 CWs (right side of each antenna port table (corresponding to rank 5-8).

[0399] • 3 DMRS ports within a CDM group are allocated to a certain UE (e.g., extended Type 1 DMRS ports = {0, 1, 8}, extended Type 2 DMRS ports = {0, 1, 12}).

[0400] Hereinafter, in Embodiments 2.1-2.4, each case is explained.

[0401] [Embodiment 2.1]

[0402] In Embodiment 2.1, a case where DMRS Type = extended Type 1 and DMRS maximum length = 1 is explained.

[0403] In the above Figures 5-6 In the antenna port table shown in FIG. 2, in a case where at least one of the rows indicated below (Conditions 1-4) is satisfied, the UE can also apply the MU-MIMO scheduling restriction. That is, the UE can also assume that the other DMRS ports are not allocated to other UEs.

[0404] <Condition 1>

[0405] (value = 9, 10, 21, 22, 30, 31)

[0406] These row indices are examples of 3 / 4 ports being allocated across two CDM groups.

[0407] <Condition 2>

[0408] (value = 11, 23)

[0409] These row indices are examples of 2 ports being allocated across two CDM groups. In this case, the UE is able to perform channel estimation without considering FD-OCC by knowing that MU-MIMO is not applied. In particular, in a case where the frequency selectivity is strong, both UE processing load reduction effects and characteristic improvement effects (since FD-OCC is not substantially used) can be expected.

[0410] <Condition 3>

[0411] (value = 24-29)

[0412] These row indices are an example of 3 / 4 ports being allocated across two CDM groups.

[0413] • In the case where the above "remaining all orthogonal antenna ports" means DMRS ports within a CDM group (one CDM group), if 4 ports are allocated, additional multiplexing within the same CDM group is not possible in a physical sense. Therefore, this constraint is required.

[0414] • In the case where the above "remaining all orthogonal antenna ports" means DMRS ports within CDM groups, additional multiplexing within multiple CDM groups is possible. Therefore, this constraint can or can not be applied.

[0415] <Condition 4>

[0416] (2 CW (value corresponding to the right half of the antenna port table) = 0-3)

[0417] In the case of 2 CW. It can be prohibited or not prohibited to allocate the free DMRS port to other UEs.

[0418] [Embodiment 2.2]

[0419] In Embodiment 2.2, the case where DMRS type = extended type 1 and DMRS maximum length = 2 is described. In addition, in Embodiment 2.2, the same as Embodiment 2.1 (or also the same content can be controlled / configured / adjusted, etc.) can not be repeatedly described.

[0420] In the above Figure 7 -9 shown in the antenna port table, in the case where at least one of the rows indicated below (Conditions 1-4) is applied, the UE can also apply the MU-MIMO scheduling constraint. That is, the UE can also assume that other DMRS ports are not allocated to other UEs.

[0421] <Condition 1>

[0422] (value = 9, 10, 26-30, 40-41, 57-61, 68, 69)

[0423] These row indices are an example of 3 / 4 ports being allocated across two CDM groups.

[0424] <Condition 2>

[0425] (value = 11, 42)

[0426] These row indexes are an example in which 2 ports are allocated across two CDM groups. In this case, the UE can perform channel estimation without considering FD-OCC by knowing that MU-MIMO is not applied. Especially in a case where frequency selectivity is strong, both UE processing load reduction effect and characteristic improvement effect (since FD-OCC is not substantially used) can be expected.

[0427] <Condition 3>

[0428] (value = 62-67)

[0429] These row indexes are an example in which 3 / 4 ports are allocated within one CDM group.

[0430] • In a case where the above-mentioned "all of the remaining orthogonal antenna ports" means DMRS ports within a CDM group (one CDM group), if 4 ports are allocated, additional multiplexing within the same CDM group is not possible in terms of physics. Therefore, this constraint is required.

[0431] • In a case where the above-mentioned "all of the remaining orthogonal antenna ports" means DMRS ports within CDM groups, additional multiplexing within multiple CDM groups is possible. Therefore, this constraint can or can not be applied.

[0432] <Condition 4>

[0433] (value of 2CW (corresponding to the right half of the antenna port table) = 0-23)

[0434] In the case of 2CW, it can or can not be prohibited to allocate the free DMRS port to another UE.

[0435] [Embodiment 2.3]

[0436] In Embodiment 2.3, a case where DMRS type = extended type 2 and DMRS maximum length = 1 is described. In addition, in Embodiment 2.3, the same as Embodiments 2.1-2.2 (or also the same as being controlled / configured / adjusted, etc.) can not be repeatedly described.

[0437] In the above-mentioned Figures 10-1 In the antenna port table shown in FIG. 2, the UE can also apply a MU-MIMO scheduling constraint in a case where at least one of the rows indicated below (Conditions 1-4) is applied. That is, the UE can also assume that other DMRS ports are not allocated to other UEs.

[0438] <Condition 1>

[0439] (value = 9, 10, 20-22, 33-34, 44-46, 60, 61)

[0440] These row indices are examples of 3 / 4 ports being allocated across two CDM groups. In addition, value = 10, 34 can also be excluded from this constraint.

[0441] <Condition 2>

[0442] (value = 23, 47)

[0443] These row indices are examples of 2 ports being allocated across two CDM groups. In this case, the UE is able to perform channel estimation without considering FD-OCC by knowing that MU-MIMO is not applied. In particular, in the case of strong frequency selectivity, both UE processing load reduction effects and characteristic improvement effects (since FD-OCC is not substantially used) can be expected.

[0444] <Condition 3>

[0445] (value = 48-59)

[0446] These row indices are examples of 3 / 4 ports being allocated within one CDM group.

[0447] • In the case where the above "all of the remaining orthogonal antenna ports" means DMRS ports within the same CDM group (one CDM group), additional multiplexing within the same CDM group is not possible physically if 4 ports are allocated. Therefore, this constraint is needed.

[0448] • In the case where the above "all of the remaining orthogonal antenna ports" means DMRS ports within multiple CDM groups, additional multiplexing within multiple CDM groups is possible. Therefore, this constraint can or can not be applied.

[0449] <Condition 4>

[0450] (value = 0-11 for 2CW (corresponding to the right half of the antenna port table))

[0451] In the case of 2CW, it can or can not be prohibited to allocate the free DMRS ports to other UEs.

[0452] [Embodiment 2.4]

[0453] In Embodiment 2.4, a case where DMRS Type = Extended Type 2 and DMRS Max Length = 2 is explained. Also, in Embodiment 2.4, the same as Embodiments 2.1 to 2.3 (or also the same as being controlled / configured / adjusted, etc.) can be applied without repeating the explanation.

[0454] In the above Figures 13-1 6, in a case where at least one of the rows shown below (Conditions 1-4) is indicated, the UE can also apply the MU-MIMO scheduling restriction. That is, the UE can assume that other DMRS ports are not allocated to other UEs.

[0455] <Condition 1>

[0456] (value = 9, 10, 20-22, 42-47, 67-68, 78-80, 100-105, 128-129)

[0457] These row indices are examples where 3 / 4 ports are allocated across two CDM groups. Also, value = 10 can be excluded from this restriction.

[0458] <Condition 2>

[0459] (value = 23, 81)

[0460] These row indices are examples where 2 ports are allocated across two CDM groups. In this case, the UE can perform channel estimation without considering FD-OCC by knowing that MU-MIMO is not applied. In particular, in a case where frequency selectivity is strong, both UE processing load reduction effect and characteristic improvement effect (since FD-OCC is not substantially used) can be expected.

[0461] <Condition 3>

[0462] (value = 116-127)

[0463] These row indices are examples where 3 / 4 ports are allocated within one CDM group.

[0464] • In a case where the above "all the remaining orthogonal antenna ports" means DMRS ports within the same CDM group (one CDM group), if 4 ports are allocated, additional multiplexing within the same CDM group is not possible in a physical sense. Therefore, this restriction is needed.

[0465] • In the case where the above-mentioned "remaining all orthogonal antenna ports" means DMRS ports within CDM groups, it is possible to additionally multiplex within CDM groups. Therefore, the constraint can be applied or not applied.

[0466] <Condition 4>

[0467] (2 CW (value corresponding to the right half of the antenna port table) = 0-43)

[0468] In the case of 2 CW, it can be prohibited or not prohibited to allocate the idle DMRS port to other UEs.

[0469] <Variant>

[0470] As explained in each of the above-mentioned embodiments, in the case where 2 CW is instructed, the above-mentioned constraint can be applied or not applied.

[0471] Further, in the CDM group to which the DMRS port corresponding to 2 CW is mapped, the above-mentioned constraint can be applied. On the other hand, in the CDM group different from this CDM group (CDM group to which the DMRS port of 2 CW is not mapped), the above-mentioned constraint can not be applied. For example, in the case where two CDM groups are applied in extended type 2, and the row associated with the number of data-free DMRS CDM groups = 3 corresponds to this case.

[0472] Further, it can also be possible to limit the maximum number of UEs that can be multiplexed in MU-MIMO according to the total number of MIMO layers that the UE can handle. For example, in the case where the maximum is 4 layers, and the UE is instructed 3 DMRS ports, it can also be possible to allow one DMRS port to be additionally allocated to other UEs in the same / different CDM group. In this case, it can not be possible to allow two or more DMRS ports to be additionally allocated to other UEs in the same / different CDM group.

[0473] This is because it is assumed that there is a limit to the MIMO order (number of layers) that the UE handles when the UE receives PDSCH using MU-MIMO. In addition, the total number of MIMO layers that the UE can handle can be specified in the specification, can be set by a higher layer, and can be reported by UE capability. These values can also be set / specified / reported per BWP / CC / Band / Frequency range (BWP / CC / Band / Frequency range).

[0474] According to the second embodiment explained above, the UE can appropriately control the application of MU-MIMO operation.

[0475] <Third Embodiment>

[0476] The third embodiment relates to switching of DMRS ports using MAC CE.

[0477] As described above, according to the new DMRS port table, the UE can be instructed the existing (Rel. 15) DMRS port (e.g., multiplexed by FD OCC of length 2) / new (Rel. 18) DMRS port. In this case, switching between the existing DMRS port / new DMRS port needs to be performed.

[0478] Therefore, the inventors of the present application have conceived a method of switching the existing DMRS port / new DMRS port using MAC CE. Thereby, flexible use of gNB can be performed. Further, for example, in the case where the application of MU-MIMO is not required, the DMRS port can be switched without reconfiguration of the higher layer. Thereby, the demodulation performance of the UE for the PDSCH can be improved.

[0479] Further, as described above, the size of the DMRS port table referred to is different between the existing DMRS port and the new DMRS port. That is, the size of the antenna port field included in the DCI (e.g., DCI format 1_1 / 1_2) is different according to the MAC CE.

[0480] < Option 1 >

[0481] The size of the antenna port field included in the DCI (e.g., DCI format 1_1 / 1_2) can be different according to the MAC CE. The UE can assume that the size of the antenna port field included in the DCI is different according to the MAC CE. Further, the timeline for switching of the DCI size (the size of the antenna port field included in the DCI) can also be specified.

[0482] For example, the UE can also switch (update) the DCI size at the slot (next slot) after a certain time (3 milliseconds) from the transmission of the ACK for the reception of the PDSCH including the MAC CE.

[0483] Switching of the DCI size and switching of the DMRS port can also be overwritten to each other.

[0484] < Option 2 >

[0485] The size of the antenna port field included in the DCI can be constant regardless of the MAC CE. The UE can assume that the size of the antenna port field included in the DCI is constant regardless of the MAC CE.

[0486] For example, the UE can also be configured / indicated by higher layer signaling / physical layer signaling that a switch of the existing DMRS port / new DMRS port can occur. In this case, the UE can determine / imagine that the size of the antenna port field included in the DCI is a specific size.

[0487] Here, the size of the antenna port field can be set to the size in the case where the existing DMRS port is configured, the size in the case where the new DMRS port is configured, or the size of the larger one of them.

[0488] For example, in the case where the size of the antenna port field in the case where the existing DMRS port is configured is 5 bits, and the size of the antenna port field in the case where the existing DMRS port is configured is 6 bits, the UE can determine / imagine that the specific size is 6 bits.

[0489] The UE can be indicated of the specific DMRS port by the 6-bit antenna port field in the DCI after being indicated of the new DMRS port by the MAC CE. The antenna port table referred to can be the table of the first embodiment.

[0490] The UE can be indicated of the specific DMRS port by a part of the bits / code points of the 6-bit antenna port field in the DCI after being indicated of the existing DMRS port by the MAC CE. For example, the UE can also ignore (not depend on) the most significant bit (MSB) / least significant bit (LSB) and be indicated of the specific DMRS port by the remaining 5 bits

[0491] The antenna port table referred to can be the table of the existing specification or the new table described above. In the case of referring to the new table, only a part of the specific row can be indicated.

[0492] In the above-described example, the antenna port field in the DCI format (for example, DCI format 1_1 / 1_2) for scheduling the PDSCH is described, but is not limited thereto. The present example can also be applied to the antenna port field in the DCI format (for example, DCI format 0_1 / 0_2) for scheduling the PUSCH. That is, in the present example, the PDSCH can be rewritten as the PUSCH for application.

[0493] According to the third embodiment described above, the UE / gNB can appropriately control the switch of the DMRS port used.

[0494] <Fourth Embodiment>

[0495] The fourth embodiment relates to an antenna port field for PUSCH.

[0496] For the antenna port field for PDSCH explained in the first embodiment, "PDSCH" can be rewritten as "PUSCH" and applied as the present embodiment. Embodiments 4.1-4.4 shown below can correspond to the above-described embodiments 1.1-1.4, respectively. Further, in the case of PUSCH, a separate table can be specified for each rank.

[0497] As with the above, the entries surrounded by [ ] in each table can also be omitted / deleted.

[0498] [Embodiment 4.1]

[0499] Figures 17A-17D An example of an antenna port table for the case of DMRS type = extended type 1, DMRS maximum length = 1, and ranks 1-4 for PUSCH is shown. Figures 18A-18D An example of an antenna port table for the case of DMRS type = extended type 1, DMRS maximum length = 1, and ranks 5-8 for PUSCH is shown.

[0500] Specifically, Figures 17A-17D Corresponding to ranks 1-4, respectively, Figures 18A-18D Corresponding to ranks 5-8, respectively. Each of these tables will extract the row entries from the above-described Figures 5-6 table for each rank (i.e., for each number of DMRS ports) as a table for each rank. In this case, the values (row indices) of the extracted row entries can be filled in front of each table (for each rank).

[0501] In each table, the remaining bits can also be specified as reserved bits (R bits).

[0502] [Embodiment 4.2]

[0503] In the case of DMRS type = extended type 1 and DMRS maximum length = 2 for PUSCH, the row entries extracted from the table for each rank can also be specified as a table for each rank (antenna port table for PUSCH). In this case, the values (row indices) of the extracted row entries can also be filled in front of each table (for each rank). Figure 7

[0504] Specifically, Figures 19A-19B An example of an antenna port table for the case of DMRS type = extended type 1, DMRS maximum length = 2, and ranks 1-2 for PUSCH is shown. Figures 20A-20C ​An example of an antenna port table in the case of DMRS type = extended Type 1, DMRS maximum length = 2, and ranks 3 to 5 for PUSCH. Figures 21A-21C An example of an antenna port table in the case of DMRS type = extended Type 1, DMRS maximum length = 2, and ranks 6 to 8 for PUSCH.

[0505] [Embodiment 4.3]

[0506] In the case of DMRS type = extended Type 2 and DMRS maximum length = 1 for PUSCH, the row entries extracted from the table of 2 can be defined as a table for each rank (antenna port table for PUSCH). In this case, the values (row indices) of the extracted row entries can also be sequentially filled in front of each table (each rank). Figures 10-1 2. The row entries extracted from the table of 2 can be defined as a table for each rank (antenna port table for PUSCH). In this case, the values (row indices) of the extracted row entries can also be sequentially filled in front of each table (each rank).

[0507] Specifically, Figures 22A-22B An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 1, and ranks 3 to 4 for PUSCH. Figures 23A-23B An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 1, and ranks 3 to 4 for PUSCH. Figures 24A-24D An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 1, and ranks 5 to 8 for PUSCH.

[0508] [Embodiment 4.4]

[0509] In the case of DMRS type = extended Type 2 and DMRS maximum length = 2 for PUSCH, the row entries extracted from the table of 6 can be defined as a table for each rank (antenna port table for PUSCH). In this case, the values (row indices) of the extracted row entries can also be sequentially filled in front of each table (each rank). Figures 13-1 2. The row entries extracted from the table of 2 can be defined as a table for each rank (antenna port table for PUSCH). In this case, the values (row indices) of the extracted row entries can also be sequentially filled in front of each table (each rank).

[0510] Specifically, Figure 25 An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and ranks 3 to 4 for PUSCH. Figure 26 An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and ranks 3 to 4 for PUSCH. Figures 27A-27B An example of an antenna port table in the case of DMRS type = extended Type 2, DMRS maximum length = 2, and ranks 3 to 4 for PUSCH. Figures 28A-28BAn example of an antenna port table in the case of DMRS type = extended type 2 for PUSCH, DMRS maximum length = 2, and rank 5 ~ 6. Figures 29A-29B An example of an antenna port table in the case of DMRS type = extended type 2 for PUSCH, DMRS maximum length = 2, and rank 7 ~ 8.

[0511] [Variant]

[0512] In the above-described embodiments 4.1 ~ 4.4, in the tables corresponding to ranks 5 ~ 8, a number of row entries can also be omitted / deleted. For example, in each of the tables for ranks 5 ~ 8, only 1 row of entries can also be selected to define the table. Thereby, in the case of ranks 5 ~ 8 of PUSCH, the antenna port field can be reused for other indications (e.g., New Data Indicator (NDI), modulation and coding scheme (MCS), etc.) facing 2 codewords.

[0513] According to the fourth embodiment described above, the UE can appropriately judge the Rel. 18 PUSCH DMRS port utilized.

[0514] [Variant]

[0515] In each of the above-described embodiments, the size of the antenna port field within the DCI can also be determined based on the number of rows of the table. For example, in the case of the table with reference values = 0 ~ 31, the UE can also judge / imagine that there is an antenna port field of 6 bits.

[0516] The size of the antenna port field can also be set / instructed by higher layer signaling / physical layer signaling. As for which rows of the table can be set by the antenna port field, it can be determined by a specific method prescribed in the specification, or can be set / instructed by higher layer signaling / physical layer signaling. The specific method can also be, for example, to determine from the upper part of the table as the number of rows that can be instructed by the size (number of bits) of the antenna port field.

[0517] Figure 30A An example of an antenna port table in the case of DMRS type = extended type 1 for PDSCH, DMRS maximum length = 2, and 2 codewords. In this case, as shown in Figure 30A , only the entries with values = 4 ~ 7, both or either of the entries with values = 8 ~ 11 can be defined.

[0518] For example, Figure 30Avalue = 4 ~ 7 is to use two CDM groups for DMRS in a single symbol. On the other hand, value = 8 ~ 11 is to use one CDM group for DMRS and the other one for data in a double symbol.

[0519] That is, since the number of REs available for data is the same in value = 4 ~ 7 and value = 8 ~ 11, the coding of data also becomes the same. Despite the difference between the case where DMRS is dense in the frequency direction and the case where DMRS is dense in the time direction, it can be considered that there is almost no difference in characteristics. Therefore, it is also possible to define only one entry group (value = 4 ~ 7 or value = 8 ~ 11).

[0520] Figure 30B An example of a table of antenna ports in the case of DMRS type = extended type 2, DMRS maximum length = 2, and 2 codewords for PDSCH is shown. In this case, as shown in FIG. 6, it is also possible to define only the entries of value = 6 ~ 9, both or either of the entry groups of value = 14 ~ 17. Figure 30B

[0521] For example, Figure 30B value = 6 ~ 9 is to use two CDM groups for DMRS in a single symbol. On the other hand, value = 14 ~ 17 is to use one CDM group for DMRS and the other one for data in a double symbol.

[0522] That is, since the number of REs available for data is different in value = 6 ~ 9 and value = 14 ~ 17, the coding of data is also different. Specifically, if the case where all CDM groups of a double symbol are used for DMRS is set to 1 (proportion (may also be referred to as DMRS density)), DMRS becomes 1 / 2 in value = 6 ~ 9 and 1 / 3 in value = 14 ~ 17.

[0523] Thus, it can be considered that the coding of data is different and a difference in characteristics can occur, and therefore it is also possible to define both of the entry groups.

[0524] Further, on the other hand, the smaller the DMRS density, the lower the coding rate of data, and therefore it is also possible to define only the entries of value = 14 ~ 17, which is smaller in DMRS density.

[0525] <Supplement>

[0526] [Notification of information to UE]

[0527] ​The notification of arbitrary information from the network (Network (NW)) (e.g., Base Station (BS)) to the UE (in other words, the reception of arbitrary information from the BS in the UE) in the above-described embodiments can also be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0528] In a case where the above-described notification is performed by the MAC CE, the MAC CE can also be identified by including a new Logical Channel ID (LCID) that is not specified in the existing standard in a MAC subheader.

[0529] In a case where the above-described notification is performed by the DCI, the above-described notification can also be performed by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in scrambling of cyclic redundancy check (CRC) bits imparted to the DCI, a format of the DCI, and the like.

[0530] Further, the notification of arbitrary information to the UE in the above-described embodiments can also be performed periodically, semi-persistently, or aperiodically.

[0531] [Notification of information from the UE]

[0532] The notification of arbitrary information from the UE (to the NW) (in other words, the transmission / reporting of arbitrary information from the UE to the BS) in the above-described embodiments can also be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0533] In a case where the above-described notification is performed by the MAC CE, the MAC CE can also be identified by including a new LCID that is not specified in the existing standard in a MAC subheader.

[0534] In a case where the above-described notification is performed by the UCI, the above-described notification can also be transmitted using the PUCCH or the PUSCH.

[0535] Further, the notification of arbitrary information from the UE in the above-described embodiments can also be performed periodically, semi-persistently, or aperiodically.

[0536] [Application of each embodiment]

[0537] At least one of the above-described embodiments can also be applied in a case where a specific condition is satisfied. The specific condition can be specified in a standard or notified to a UE / BS using higher layer signaling / physical layer signaling.

[0538] At least one of the above-described embodiments can also be applied only to a UE that reports or supports a specific UE capability.

[0539] The specific UE capability can also mean at least one of the following:

[0540] • Support for a specific process / operation / control / information for at least one of the above-described embodiments.

[0541] • Support for a larger number of DMRS ports than the existing specification for PDSCH / PUSCH.

[0542] • Support for a larger number of DMRS ports than the existing specification for PDSCH / PUSCH using TD-OCC / FD-OCC / FDM for DMRS.

[0543] • Support for FD OCC with a length of 4 / 6.

[0544] • Support for Category 1 / 2 / 3 (Category 1 / 2 / 3 DMRS ports, Category 1 / 2 / 3 DMRS port combinations).

[0545] • Support for MU-MIMO constraints.

[0546] In addition, the above-described specific UE capability can be a capability that is applied across the entire frequency (commonly regardless of the frequency), a capability per frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), a capability per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), a capability per SubCarrier Spacing (SCS), or a capability per Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0547] Moreover, the above-described specific UE capability can be a capability that is applied commonly irrespective of the duplexing scheme (commonly irrespective of the duplexing scheme) and a capability for each duplexing scheme (for example, Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0548] Moreover, at least one of the above-described embodiments can also be applied in a case where the UE is configured / activated / triggered by higher layer signaling / physical layer signaling with specific information associated with the above-described embodiments (or implements the operation of the above-described embodiments). For example, the specific information can also be information indicating activation of the function of each embodiment, an arbitrary RRC parameter for a specific version (for example, Rel. 18 / 19), and the like.

[0549] The UE can also apply, for example, the Rel. 15 / 16 operation in a case where at least one of the above-described specific UE capability is not supported, or the above-described specific information is not configured.

[0550] (Patent Citation)

[0551] With regard to an embodiment of the present disclosure, the following invention is made.

[0552] [Patent Citation 1]

[0553] A terminal comprising:

[0554] a reception unit that, in a case where a combination of a Category 1 DeModulation Reference Signal (DMRS) port, a Category 2 DMRS port, and a Category 3 DMRS port within at least one Code Division Multiplexing (CDM) group is supported, receives Downlink Control Information (DCI) indicating the combination and scheduling a downlink shared channel for one or two codewords; and

[0555] a control unit that determines a DMRS port for the downlink shared channel based on the combination,

[0556] the control unit controls switching of the DMRS port based on information related to the switching of the DMRS port.

[0557] [Patent Citation 2]

[0558] The terminal according to Patent Citation 1,

[0559] The receiving unit receives information related to switching of the DMRS port using a Medium Access Control (MAC) Control Element (CE).

[0560] [Postamble 3]

[0561] The terminal according to Postamble 1 or 2,

[0562] The information related to switching of the DMRS port is information related to a size of a field indicating the combination of the antenna ports.

[0563] [Postamble 4]

[0564] The terminal according to any one of Postambles 1 to 3,

[0565] The control unit switches the DMRS port after a certain time after the receiving unit receives the information related to switching of the DMRS port.

[0566] (Postamble)

[0567] With respect to an embodiment of the present disclosure, the invention of the following postamble.

[0568] [Postamble 1]

[0569] A terminal has:

[0570] A receiving unit receives Downlink Control Information (DCI) indicating a combination of a Category 1 DeModulation Reference Signal (DMRS) port, a Category 2 DMRS port, and a Category 3 DMRS port within at least one Code Division Multiplexing (CDM) group, and scheduling an uplink shared channel for one or two codewords; and

[0571] A control unit judges a DMRS port for the uplink shared channel based on the combination,

[0572] The control unit controls switching of the DMRS port based on information related to switching of the DMRS port.

[0573] [Postamble 2]

[0574] The terminal according to Postamble 1,

[0575] The receiving unit receives information related to switching of the DMRS port using a Medium Access Control (MAC) Control Element (CE).

[0576] [Postamble 3]

[0577] The terminal according to any one of Postamble 1 to Postamble 3,

[0578] The information related to switching of the DMRS port is information related to a size of a field indicating the combined antenna port.

[0579] [Postamble 4]

[0580] The terminal according to any one of Postamble 1 to Postamble 3,

[0581] The control unit switches the DMRS port after a certain time after the receiving unit receives the information related to switching of the DMRS port.

[0582] (Wireless communication system)

[0583] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0584] Figure 31 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (may be simply referred to as system 1) can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0585] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0586] In EN-DC, the base station of LTE (E-UTRA) (eNB) is a master node (MN), and the base station of NR (gNB) is a secondary node (SN). In NE-DC, the base station of NR (gNB) is an MN, and the base station of LTE (E-UTRA) (eNB) is an SN.

[0587] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity of both an MN and an SN being base stations of NR (NR-NR Dual Connectivity (NN-DC))).

[0588] The wireless communication system 1 can also have a base station 11 that forms a macro cell C1 with a wide coverage, and a base station 12 (12a-12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 can also be located within at least one cell. The configuration, number, and the like of the cells and the user terminal 20 are not limited to the manner shown in the drawing. Hereinafter, without distinguishing between the base stations 11 and 12, the base stations 10 are collectively referred to.

[0589] The user terminal 20 can also be connected to at least one of the multiple base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0590] Each of the CCs can also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell Cl can also be included in the FR1, and the small cell C2 can also be included in the FR2. For example, the FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and the FR2 can also be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited to these, and for example, the FR1 can also correspond to a frequency band higher than the FR2.

[0591] Furthermore, in each of the CCs, the user terminal 20 can also communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0592] The plurality of base stations 10 can also be connected by wire (for example, optical fiber based on Common Public Radio Interface (CPRI), X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 corresponding to a higher station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) can also be referred to as an IAB node.

[0593] The base station 10 can also be connected to a core network 30 via another base station 10 or directly. The core network 30 can also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), or the like, for example.

[0594] The core network 30 can also include, for example, a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), an Operation, Administration and Maintenance (OAM), and the like network functions (NFs). Also, a plurality of functions can be provided by one network node. Further, communication with an external network (e.g., the Internet) can be performed via a DN.

[0595] The user terminal 20 can also be at least one terminal that supports LTE, LTE-A, 5G, or the like.

[0596] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of a Downlink (DL) and an Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like can also be used.

[0597] The radio access scheme can also be referred to as a waveform. Further, in the radio communication system 1, other radio access schemes (for example, other single carrier transmission schemes, other multicarrier transmission schemes) can also be used in the radio access schemes of the UL and the DL.

[0598] As downlink channels, in the radio communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and the like, which are shared among the user terminals 20, can also be used.

[0599] Further, as uplink channels, in the radio communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like, which are shared among the user terminals 20, can also be used.

[0600] Through the PDSCH, user data, higher layer control information, a System Information Block (SIB), and the like, can be transmitted. Through the PUSCH, user data, higher layer control information, and the like, can also be transmitted. Further, through the PBCH, a Master Information Block (MIB) can also be transmitted.

[0601] Through the PDCCH, lower layer control information can also be transmitted. The lower layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0602] Further, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, and the like, and the DCI that schedules the PUSCH can also be referred to as a UL grant, a UL DCI, and the like. Further, the PDSCH can also be rewritten as DL data, and the PUSCH can also be rewritten as UL data.

[0603] In the detection of the PDCCH, a control resource set (CORESET) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area of the PDCCH candidate and a search method. One CORESET can also be associated with one or a plurality of search spaces. The UE can also monitor the CORESET associated with the search space based on a search space setting.

[0604] One search space can also correspond to the PDCCH candidate equivalent to one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", and the like of the present disclosure can also be rewritten to each other.

[0605] At least one uplink control information (Uplink Control Information (UCI)) including channel state information (Channel State Information (CSI)), delivery confirmation information (for example, also referred to as a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, and the like), and a scheduling request (Scheduling Request (SR)) can also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through the PRACH.

[0606] In addition, in the present disclosure, "downlink", "uplink", and the like can also be described without "link". Furthermore, "Physical" can also be described without the beginning of various channels.

[0607] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like can also be transmitted.

[0608] The synchronization signal can be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), or the like. In addition, the SS, the SSB, and the like can also be referred to as a reference signal.

[0609] Further, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), and the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0610] (Base station)

[0611] Figure 32FIG. 1 is a diagram showing an example of a structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface 140. Note that the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 can each be provided more than one.

[0612] In the present example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and it is also conceivable that the base station 10 has other functional blocks required for wireless communication. Part of the processing of each unit described below can also be omitted.

[0613] The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured of a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0614] The control unit 110 can also control generation of signals, scheduling (for example, resource allocation, mapping), and the like. The control unit 110 can also control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, a sequence, and the like transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0615] The transmission / reception unit 120 can include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 can include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be configured of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0616] The transmission / reception unit 120 can be configured as an integrated transmission / reception unit, or can be configured of a transmission unit and a reception unit. The transmission unit can be configured of the transmission processing unit 1211 and the RF unit 122. The reception unit can be configured of the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0617] The transmission / reception antenna 130 can be constituted by an antenna such as an array antenna and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0618] The transmission / reception unit 120 can also transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 120 can also receive the uplink channel, the uplink reference signal, and the like described above.

[0619] The transmission / reception unit 120 can also form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

[0620] The transmission / reception unit 120 (transmission processing unit 1211) can also generate a bit string to be transmitted, for example, by performing processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 110.

[0621] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing of channel coding (which can include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-analog conversion, and the like, with respect to the bit string to be transmitted, and output a baseband signal.

[0622] The transmission / reception unit 120 (RF unit 122) can also perform modulation to a wireless band, filter processing, amplification, and the like, with respect to the baseband signal, and transmit a signal of the wireless band via the transmission / reception antenna 130.

[0623] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to a baseband signal, and the like, with respect to a signal of the wireless band received by the transmission / reception antenna 130.

[0624] The transmission / reception unit 120 (reception processing unit 1212) can also apply, to the acquired baseband signal, reception processing such as analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as necessary), filter processing, demapping, demodulation, decoding (which can also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like, and acquire user data and the like.

[0625] The transmission / reception unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, and the like, based on the received signal. The measurement unit 123 can also perform measurements with respect to received power (for example, Reference Signal Received Power (RSRP)), received quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like. The measurement results can also be output to the control unit 110.

[0626] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between apparatuses included in the core network 30 (for example, network nodes that provide NFs), other base stations 10, and the like, and can acquire, transmit, and the like, user data (user plane data), control plane data, and the like, for the user terminals 20.

[0627] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0628] The transmission / reception unit 120 can also transmit downlink control information (DCI) indicating a combination of a category 1 demodulation reference signal (DMRS) port, a category 2 DMRS port, and a category 3 DMRS port within at least one code division multiplexing (CDM) group, and scheduling a downlink shared channel for one or two codewords, in a case where the combination is supported. The transmission / reception unit 120 can also transmit uplink control information (DCI) indicating a combination of a category 1 demodulation reference signal (DMRS) port, a category 2 DMRS port, and a category 3 DMRS port within at least one code division multiplexing (CDM) group, and scheduling a downlink shared channel for one or two codewords, in a case where the combination is supported. The transmission / reception unit 120 can also receive the downlink shared channel transmitted through a DMRS port for the downlink shared channel judged based on the combination. The DMRS port can be switched based on information related to the switching of the DMRS port.

[0629] The control unit 110 can also control transmission of the uplink shared channel using a DMRS port for the uplink shared channel judged based on the combination. The control unit 110 can also control switching of the DMRS port based on information related to the switching of the DMRS port.

[0630] (user terminal)

[0631] Figure 33 is a diagram indicating an example of a structure of a user terminal according to an embodiment. The user terminal 20 is provided with a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 can be provided.

[0632] In addition, in the present example, mainly functional blocks of characteristic parts in the present embodiment are shown, and it can also be assumed that the user terminal 20 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below can also be omitted.

[0633] The control unit 210 implements control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like, which can be described based on common knowledge in the technical field to which the present disclosure pertains.

[0634] The control unit 210 can also control generation, mapping, and the like of signals. The control unit 210 can also control transmission and reception, measurement, and the like using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 can also generate data, control information, sequences, and the like to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0635] The transmission and reception unit 220 can also include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can also include a transmission processing unit 2211, a reception processing unit 2212. The transmission and reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission and reception circuit, and the like, which can be described based on common knowledge in the technical field to which the present disclosure pertains.

[0636] The transmission and reception unit 220 can be constituted as an integrated transmission and reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 2211, the RF unit 222. The reception unit can be constituted by the reception processing unit 2212, the RF unit 222, the measurement unit 223.

[0637] The transmission and reception antenna 230 can be constituted by an antenna, for example, an array antenna, and the like, which can be described based on common knowledge in the technical field to which the present disclosure pertains.

[0638] The transmission and reception unit 220 can receive the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission and reception unit 220 can transmit the uplink channel, the uplink reference signal, and the like described above.

[0639] The transmission and reception unit 220 can use digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like, to form at least one of a transmission beam and a reception beam.

[0640] The transmission and reception unit 220 (transmission processing unit 2211) can also perform, for example, processing at the PDCP layer, processing at the RLC layer (for example, RLC retransmission control), processing at the MAC layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 210, to generate a bit string to be transmitted.

[0641] The transmission / reception unit 220 (transmission processing unit 2211) can also perform, on the bit string to be transmitted, transmission processing such as channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, digital-analog conversion, and the like, and output a baseband signal.

[0642] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), in a case where transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-described transmission processing in order to transmit the channel with a DFT-s-OFDM waveform, and in a case where this is not so, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-described transmission processing.

[0643] The transmission / reception unit 220 (RF unit 222) can also perform, on the baseband signal, modulation to a radio frequency band, filter processing, amplification, and the like, and transmit a signal of the radio frequency band via the transmission / reception antenna 230.

[0644] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform, on a signal of the radio frequency band received by the transmission / reception antenna 230, amplification, filter processing, demodulation to a baseband signal, and the like.

[0645] The transmission / reception unit 220 (reception processing unit 2212) can also apply, on the acquired baseband signal, reception processing such as analog-digital conversion, FFT processing, IDFT processing (as necessary), filter processing, demapping, demodulation, decoding (which can include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like, and acquire user data and the like.

[0646] The transmission / reception unit 220 (measurement unit 223) can also perform measurement related to a received signal. For example, the measurement unit 223 can also perform RRM measurement, CSI measurement, and the like, based on the received signal. The measurement unit 223 can also perform measurement on reception power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result can also be output to the control unit 210.

[0647] In addition, the measurement unit 223 can also derive channel measurement for CSI computation based on the channel measurement resource. The channel measurement resource can also be, for example, a Non Zero Power (NZP) CSI-RS resource. Furthermore, the measurement unit 223 can also derive interference measurement for CSI computation based on the interference measurement resource. The interference measurement resource can also be at least one of a NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, and the like. In addition, the CSI-IM can also be referred to as a CSI-Interference Management (IM), and can also be mutually overwritten with a Zero Power (ZP) CSI-RS.

[0648] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0649] The transmission / reception unit 220 can also receive, in a case where a combination of a Category 1 DeModulation Reference Signal (DMRS) port, a Category 2 DMRS port, and a Category 3 DMRS port within at least one Code Division Multiplexing (CDM) group is supported, downlink control information (DCI) indicating the combination and scheduling a downlink shared channel for one or two codewords. The transmission / reception unit 220 can also receive, using a Medium Access Control (MAC) control element (CE), information related to switching of the DMRS ports. The transmission / reception unit 220 can also receive, in a case where a combination of a Category 1 DeModulation Reference Signal (DMRS) port, a Category 2 DMRS port, and a Category 3 DMRS port within at least one Code Division Multiplexing (CDM) group is supported, downlink control information (DCI) indicating the combination and scheduling an uplink shared channel for one or two codewords.

[0650] The control unit 210 can also determine a DMRS port for the downlink shared channel based on the combination. The control unit 210 can also control switching of the DMRS port based on information related to the switching of the DMRS port. The information related to the switching of the DMRS port can also be information related to a size of an antenna port field indicating the combination. The control unit 210 can also switch the DMRS port after a certain time after the reception unit receives the information related to the switching of the DMRS port.

[0651] (Hardware structure)

[0652] In addition, the block diagrams used in the description of the above-described embodiments show blocks of functional units. These functional blocks (structural units) are realized by any combination of hardware and software of at least one of them. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block can be realized by one device physically or logically integrated, or by a plurality of devices physically or logically separated and connected directly or indirectly (for example, by wire, wireless, or the like). Each functional block can also be realized by combining the above-described one device or the above-described plurality of devices with software.

[0653] Here, in the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that realizes a transmission function can also be referred to as a transmitting unit, a transmitter, or the like. Any one of them is as described above, and the method of realizing it is not particularly limited.

[0654] For example, the base station, the user terminal, and the like in one embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 34 is a diagram showing an example of a hardware structure of a base station and a user terminal according to one embodiment. The above-described base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0655] Also, in the present disclosure, the terms of apparatus, circuit, device, section, unit, and the like can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each of the apparatuses shown in the drawings, or can be configured not to include a part of the apparatuses.

[0656] For example, the processor 1001 is illustrated only one, but there can be a plurality of processors. Also, the processing can be executed by one processor, or can be executed by two or more processors simultaneously, sequentially, or with other methods. Also, the processor 1001 can be realized by one or more chips.

[0657] As for each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into the processor 1001, the memory 1002, or the like hardware, the processor 1001 performs an operation and controls communication via the communication apparatus 1004, or at least one of reading and writing of data in the memory 1002 and the storage 1003 is controlled.

[0658] The processor 1001, for example, enables an operating system to operate to control the entire computer. The processor 1001 can also be constituted by a central processing device (Central Processing Unit (CPU)) including an interface with a peripheral device, a control apparatus, an arithmetic apparatus, a register, and the like. For example, at least a part of the above-described control unit 110 (210), the transmission and reception unit 120 (220), and the like can also be realized by the processor 1001.

[0659] Further, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication apparatus 1004 to the memory 1002, and performs various processing according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) can also be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be applied to other functional blocks.

[0660] The memory 1002 can also be a computer-readable recording medium such as at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other appropriate types of storage media. The memory 1002 can also be referred to as a register, a cache, a main memory, and the like. The memory 1002 can store programs (program codes), software modules, and the like, which are executable to implement the wireless communication method according to an embodiment of the present disclosure.

[0661] The storage 1003 can also be a computer-readable recording medium such as at least one of a flexible disc, a Floppy (registered trademark) disc, a magneto-optical disc (e.g., a Compact Disc (Compact Disc ROM (CD-ROM)), and the like), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disc, a hard disk drive, an intelligent card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, other appropriate types of storage media. The storage 1003 can also be referred to as an auxiliary storage device.

[0662] The communication device 1004 is hardware (a transmission-reception device) such as a network device, a network controller, a network card, a communication module, and the like, for performing communication between computers via at least one of a wired network and a wireless network. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The transmission-reception unit 120 (220), the transmission-reception antenna 130 (230), and the like described above can also be implemented by the communication device 1004. The transmission-reception unit 120 (220) can also be implemented by a transmission unit 120a (220a) and a reception unit 120b (220b) which are physically or logically separated.

[0663] The input device 1005 is an input device that receives input from the outside (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like). The output device 1006 is an output device that implements output to the outside (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, or the like). In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (for example, a touch panel).

[0664] Further, the processor 1001, the memory 1002, and the like are connected through a bus 1007 for communicating information. The bus 1007 can be configured with a single bus, or can be configured with different buses between the devices.

[0665] Further, the base station 10 and the user terminal 20 can also be configured to include a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), or the like hardware, and a part or all of each functional block can also be implemented using the hardware. For example, the processor 1001 can also be implemented using at least one of these hardware.

[0666] (Modified example)

[0667] In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure can also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (a signal or signaling) can also be rewritten to each other. Further, the signal can also be a message. The Reference Signal can also be abbreviated as RS, and can also be referred to as a Pilot, a pilot signal, or the like depending on the applied standard. Further, the Component Carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

[0668] A radio frame can also be configured with one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that configure the radio frame can also be referred to as a subframe. Further, the subframe can also be configured with one or more slots in the time domain. The subframe can also be a fixed time length (for example, 1 ms) that is independent of numerology.

[0669] Here, the numerology can also be a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the numerology can also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), a number of symbols per TTI, a radio frame structure, a specific filtering processing performed by a transmitter-receiver in a frequency domain, a specific windowing processing performed by the transmitter-receiver in a time domain, and the like.

[0670] A slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and the like) in a time domain. Also, a slot can also be a time unit based on numerology.

[0671] A slot can also contain a plurality of mini-slots. Each mini-slot can also be composed of one or more symbols in a time domain. Also, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0672] A radio frame, a subframe, a slot, a mini-slot, and a symbol all represent a time unit in which a transmission signal is transmitted. A radio frame, a subframe, a slot, a mini-slot, and a symbol can also use other designations corresponding to each. Also, the time units of frame, subframe, slot, mini-slot, symbol, and the like in the disclosure can also be replaced with each other.

[0673] For example, one subframe can also be referred to as a TTI, a plurality of consecutive subframes can also be referred to as a TTI, one slot or one mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), and can also be a period longer than 1 ms. Also, a unit representing a TTI can not be referred to as a subframe, but can be referred to as a slot, a mini-slot, and the like.

[0674] Here, the TTI refers to, for example, a minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling of allocating radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0675] The TTI can also be a transmission time unit of a data packet (transport block), a code block, a code word, or the like that has been subjected to channel coding, and can also become a processing unit of scheduling, link adaptation, or the like. Note that when the TTI is given, the time interval (for example, the number of symbols) to which a transport block, a code block, a code word, or the like is actually mapped can also be shorter than the TTI.

[0676] Note that in a case where one slot or one mini-slot is referred to as the TTI, one or more TTIs (that is, one or more slots or one or more mini-slots) can also become a minimum time unit of scheduling. Furthermore, the number of slots (the number of mini-slots) that constitute the minimum time unit of scheduling can also be controlled.

[0677] A TTI having a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, or the like. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, or the like.

[0678] Note that the long TTI (for example, the normal TTI, the subframe, or the like) can also be rewritten as a TTI having a time length exceeding 1 ms, and the short TTI (for example, the shortened TTI, or the like) can also be rewritten as a TTI having a TTI length shorter than the long TTI and a TTI length of 1 ms or more.

[0679] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB can also be the same regardless of the numerology, and can also be 12, for example. The number of subcarriers included in the RB can also be determined based on the numerology.

[0680] Furthermore, the RB can also include one or more symbols in the time domain, and can also be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, or the like can also be constituted by one or more resource blocks, respectively.

[0681] In addition, one or a plurality of RBs can also be referred to as a Physical RB (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, a RB pair, or the like.

[0682] In addition, a resource block can also be composed of one or a plurality of Resource Elements (REs). For example, one RE can also be a wireless resource area of one subcarrier and one symbol.

[0683] A Bandwidth Part (BWP) (may also be referred to as a partial bandwidth, etc.) can also indicate a subset of contiguous common RBs (common resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can be determined by the index of the RBs with reference to a common reference point of the carrier. A PRB can also be defined in a certain BWP and additionally numbered within the BWP.

[0684] A UL BWP (BWP for UL) and a DL BWP (BWP for DL) can also be included in a BWP. For a UE, one or a plurality of BWPs can also be configured within one carrier.

[0685] At least one of the configured BWPs can also be activated, and the UE can not be assumed to transmit and receive a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", and the like in the present disclosure can also be rewritten as "BWP".

[0686] In addition, the above-described structures of a radio frame, a subframe, a slot, a mini-slot, and a symbol, and the like are merely examples. For example, the number of subframes included in a radio frame, the number of slots of each subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or a mini-slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, and the like within a TTI can be variously changed.

[0687] In addition, the information, parameters, and the like described in the present disclosure can be expressed by an absolute value, can be expressed by a relative value with respect to a specific value, and can also be expressed by corresponding other information. For example, a wireless resource can also be indicated by a specific index.

[0688] In the present disclosure, names used for parameters and the like are not names in all respects that are limiting. Furthermore, mathematical expressions and the like using these parameters can also be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, and the like) and information elements can be identified by any appropriate names, and thus various names assigned to these various channels and information elements are not names in all respects that are limiting.

[0689] Information, signals, and the like described in the present disclosure can also be represented by any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0690] Furthermore, information, signals, and the like can be outputted in at least one direction, i.e., from higher layers (upper layers) to lower layers (lower layers) and from lower layers to higher layers. Information, signals, and the like can also be inputted / outputted via a plurality of network nodes.

[0691] Information, signals, and the like inputted / outputted can be stored in a specific location (e.g., a memory) and can be managed using a management table. Information, signals, and the like inputted / outputted can be overwritten, updated, or appended. Information, signals, and the like outputted can be deleted. Information, signals, and the like inputted can be transmitted to other devices.

[0692] Notification of information is not limited to the manners / embodiments described in the present disclosure and can be performed using other methods. For example, notification of information in the present disclosure can also be implemented through 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), and the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0693] In addition, the physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Furthermore, the RRC signaling can also be referred to as an RRC message, and can also be, for example, an RRC connection setup message, an RRC connection reconfiguration message, and the like. Furthermore, the MAC signaling can also be notified using, for example, a MAC control element (CE).

[0694] Furthermore, the notification of the specific information (for example, the notification of "X") is not limited to explicit notification, and can also be performed implicitly (for example, by not performing the notification of the specific information, or by the notification of other information).

[0695] The determination can be performed by a value represented by one bit (0 or 1), by a true / false value (boolean) represented by true or false, or by comparison of numerical values (for example, comparison with a specific value).

[0696] Software, regardless of being referred to as software, firmware, middle-ware, microcode, hardware description language, or by other names, should be broadly interpreted as meaning instructions, instruction sets, code (code), code segments (code segment), program code (program code), programs (program), sub-programs (sub-program), software modules (software module), applications (application), software applications (software application), software packages (software package), routines (routine), sub-routines (sub-routine), objects (object), executable files, execution threads, processes, functions, and the like.

[0697] Moreover, software, instructions, information, etc. can also be sent using a transmission medium or transmission media (e.g., wired wires, wired lines, fibers, buses, etc.), wireless technologies (e.g., infrared or microwave), etc., according to particular needs. For example, if software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cables, fiber optic cables, twisted pair cables, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), then at least one of these wired technologies and wireless technologies is included within the definition of transmission medium.

[0698] In the present disclosure, the terms “system” and “network” can be used interchangeably. “Network” can also mean an apparatus (e.g., a base station) included in the network.

[0699] In the present disclosure, the terms “precoding”, “precoder”, “weight (precoding weight)”, “Quasi-Co-Location (QCL)”, “Transmission Configuration Indication state (TCI state)”, “spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, “antenna port”, “layer”, “number of layers”, “rank”, “resource”, “resource set”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel”, “UE panel”, “transmitting entity”, “receiving entity”, etc. can be used interchangeably.

[0700] In addition, in the present disclosure, an antenna port can also be mutually rewritten with an antenna port for an arbitrary signal / channel (e.g., a DeModulation Reference Signal (DMRS) port). In the present disclosure, a resource can also be mutually rewritten with a resource for an arbitrary signal / channel (e.g., a reference signal resource, an SRS resource, etc.). In addition, a resource can also include a time / frequency / symbol / spatial / power resource. Furthermore, a spatial domain transmission filter can also include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0701] The above group, for example, can also include at least one of a spatial relation group, a code division multiplexing (Code Division Multiplexing (CDM)) group, a reference signal (Reference Signal (RS)) group, a control resource set (COntrol REsource SET (CORESET)) group, a PUCCH group, an antenna port group (for example, a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0702] Further, in the present disclosure, a beam, an SRS resource indicator (SRS Resource Indicator (SRI)), a CORESET, a CORESET pool, a PDSCH, a PUSCH, a codeword (Codeword (CW)), a transport block (Transport Block (TB)), an RS, and the like can also be rewritten to each other.

[0703] Further, in the present disclosure, a TCI state, a downlink TCI state (DL TCI state), an uplink TCI state (UL TCI state), a unified TCI state, a common TCI state, a joint TCI state, and the like can also be rewritten to each other.

[0704] Further, in the present disclosure, “QCL”, “QCL assumption”, “QCL relationship”, “QCL type information”, “QCL property / properties”, “property / properties of a specific QCL type (for example, Type A, Type D)”, “a specific QCL type (for example, Type A, Type D)”, and the like can also be rewritten to each other.

[0705] In the present disclosure, an index, an identifier (Identifier (ID)), an indicator, an indication, a resource ID, and the like can also be rewritten to each other. In the present disclosure, a sequence, a list, a set, a group, a cluster, a cluster, a subset, and the like can also be rewritten to each other.

[0706] Further, a spatial relation information Identifier (ID) (TCI state ID) and spatial relation information (TCI state) can also be rewritten to each other. The “spatial relation information (TCI state)” can also be rewritten to “a set of spatial relation information (TCI states)”, “one or more spatial relation information”, and the like. A TCI state and a TCI can also be rewritten to each other. Spatial relation information and a spatial relation can also be rewritten to each other.

[0707] In the present disclosure, the terms "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", "component carrier", and the like can be used interchangeably. There are also cases where the base station is called with the terms "macro cell", "small cell", "femto cell", "pico cell", and the like.

[0708] A base station can accommodate one or plural (for example, three) cells. In a case where a base station accommodates plural cells, the coverage area of the base station as a whole can be divided into plural smaller areas, and each of the smaller areas can also be provided with communication services by a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services in the coverage area.

[0709] In the present disclosure, the matter of a base station transmitting information to a terminal can also be mutually overridden with the matter of the base station instructing the terminal to control / operate based on the information.

[0710] In the present disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", and the like can be used interchangeably.

[0711] There are also cases where the mobile station is called with the terms "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", "hand set", "user agent", "mobile client", "client", or several other appropriate terms.

[0712] At least one of the base station and the mobile station can also be called a transmission device, a reception device, a wireless communication device, and the like. In addition, at least one of the base station and the mobile station can also be a device mounted on a moving object, a moving object body, and the like.

[0713] The mobile body refers to an object that can move, and the moving speed is arbitrary, and of course, the mobile body also includes a case where the mobile body stops. The mobile body includes, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, a shovel, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a handcart, a rickshaw, a ship (a ship and other watercraft), an airplane, a rocket, an artificial satellite, a drone, a multicopter, a quadcopter, a hot air balloon, and an object mounted thereon, and is not limited to these. In addition, the mobile body can also be a mobile body that autonomously travels based on a travel instruction.

[0714] The mobile body can be a vehicle (for example, a vehicle, an airplane, or the like), can be a mobile body that moves in a manner without a person (for example, a drone, an autonomous vehicle, or the like), and can be a robot (a manned type or an unmanned type). In addition, at least one of the base station and the mobile station also includes an apparatus that does not necessarily move at the time of a communication operation. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0715] Figure 35 FIG. 1 is a diagram that shows an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, front wheels 46 on the left and right, rear wheels 47 on the left and right, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air 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.

[0716] The drive unit 41 is configured by at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 is configured to include at least a steering wheel (also referred to as a handle), and at least one of the front wheels 46 and the rear wheels 47 is steered based on an operation of the steering wheel operated by a user.

[0717] The electronic control unit 49 is constituted by a microprocessor 61, a memory (ROM, RAM) 62, a communication port (for example, an Input / Output (I / O) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 can also be referred to as an Electronic Control Unit (ECU).

[0718] As the signals from the various sensors 50-58, there are the following signals and the like: a current signal from a current sensor 50 that senses a current of the motor, a rotational speed signal of the front wheels 46 / rear wheels 47 acquired by a rotational speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 acquired by an air pressure sensor 52, a vehicle speed signal acquired by a vehicle speed sensor 53, an acceleration signal acquired by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 acquired by a brake pedal sensor 56, an operation signal of the shift lever 45 acquired by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, and the like acquired by an object detection sensor 58.

[0719] The information service unit 59 is constituted by various devices for providing (outputting) various information such as driving information, traffic information, entertainment information, and the like of a navigation system, an audio system, a speaker, a display, a television, a radio, and one or more ECUs that control these devices. The information service unit 59 provides various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40 using information acquired from external devices via the communication module 60 and the like.

[0720] The information service unit 59 can include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, and the like) that receives input from the outside, and can include an output device (for example, a display, a speaker, an LED lamp, a touch panel, and the like) that performs output to the outside.

[0721] The drive assist system unit 64 is constituted by a millimeter wave radar, a Light Detection and Ranging (LiDAR), a camera, a positioning detector (for example, a Global Navigation Satellite System (GNSS), and the like), map information (for example, a High Definition (HD) map, an Autonomous Vehicle (AV) map, and the like), a gyro system (for example, an Inertial Measurement Device (Inertial Measurement Unit (IMU)), an Inertial Navigation Device (Inertial Navigation System (INS)), and the like), an Artificial Intelligence (AI) chip, an AI processor, and the like, which are various devices for providing a function for preventing an accident or reducing a driving burden of a driver, and one or more ECUs that control these devices. Further, the drive assist system unit 64 transmits and receives various information via the communication module 60, and realizes a drive assist function or an autonomous driving function.

[0722] The communication module 60 is capable of communicating with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the microprocessor 61 and the memory (ROM, RAM) 62, and various sensors 50-58 in the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the front wheels 46, the rear wheels 47, the axle 48, and the electronic control unit 49 provided in the vehicle 40 via the communication port 63.

[0723] The communication module 60 is capable of being controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device capable of communicating with an external device. For example, various information is transmitted and received between the external device via wireless communication. The communication module 60 can be inside and outside the electronic control unit 49. The external device can be, for example, the base station 10, the user terminal 20, and the like described above. Further, the communication module 60 can be, for example, at least one of the base station 10 and the user terminal 20 described above (may function as at least one of the base station 10 and the user terminal 20).

[0724] The communication module 60 can also transmit at least one of the signals from the various sensors 50-58 described above input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to the external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, and the like can also be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 can also contain information based on the above input.

[0725] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, and the like) transmitted from the external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 can also be referred to as an output unit that outputs information (for example, outputs information to a display, a speaker, and the like based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0726] Further, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the front wheels 46 on the left and right, the rear wheels 47 on the left and right, the axles 48, the various sensors 50-58, and the like provided in the vehicle 40.

[0727] Further, the base station in the present disclosure can also be rewritten as a user terminal. For example, the structures in which the communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (for example, can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), and the like) can also apply the various modes / embodiments of the present disclosure. In this case, it can also be configured to have the functions of the base station 10 described above by the user terminal 20. Further, the terms of "uplink", "downlink", and the like can also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, the uplink channel, the downlink channel, and the like can also be rewritten as a sidelink channel.

[0728] Likewise, the user terminal in the present disclosure can also be rewritten as a base station. In this case, it can also be configured to have the functions of the user terminal 20 described above by the base station 10.

[0729] In the present disclosure, actions by a base station are sometimes also performed by an upper node thereof depending on the situation. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited to these), or a combination thereof.

[0730] The modes / embodiments explained in the present disclosure can be used alone or in combination, and can also be used in switching as execution proceeds. Furthermore, the processing procedure, timing, flowchart, and the like of the modes / embodiments explained in the present disclosure can also be changed in order as long as there is no contradiction. For example, for the methods explained in the present disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0731] The modes / embodiments explained in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is an integer, a fraction)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended, modified, created, or specified based on them, and the like. Furthermore, a plurality of systems can also be combined (for example, LTE or LTE-A, in combination with 5G, and the like) and applied.

[0732] The description "based on" used in the present disclosure does not mean "only based on" unless specifically written. In other words, the description "based on" means both "only based on" and "at least based on".

[0733] Any reference to an element or element in the disclosure using a "first" "second" and the like does not necessarily limit the quantity or order of those elements. Such terms can be used herein as a convenient method of distinguishing between two or more elements or instances or versions of at least one element. Thus, a reference to first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some manner.

[0734] The term "determining" as used in the disclosure encompasses a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as looking up in a table, a database or other data structure), ascertaining and the like.

[0735] In addition, "determining" can also include receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory) and the like.

[0736] That is, "determining" can also include the action of receiving some information and acting upon it at a later time. Also, "determining" can also be construed as "assuming," "expecting," "considering," and the like. In the present disclosure, "determining" can also be interchanged with the above-mentioned operations.

[0737] In addition, in the present disclosure, "determining" can also be interchanged with "assuming," "expecting," "considering," and the like. In addition, in the present disclosure, "not assuming to perform" can also be interchanged with "assuming not to perform."

[0738] In the present disclosure, "expect" can also be mutually rewritten with "be expected". For example, "expect(s)..." (the "..." can also be expressed by that clause, to infinitive, and the like) can also be mutually rewritten with "be expected...". "Does not expect..." can also be mutually rewritten with "be not expected...". Furthermore, "An apparatus A is not expected..." can also be mutually rewritten with "A device B other than the apparatus A does not expect... " (for example, in the case where the apparatus A is a UE, the device B can also be a base station).

[0739] The "maximum transmission power" described in the present disclosure can mean the maximum value of the transmission power, can mean the nominal maximum transmission power (the nominal UE maximum transmission power), or can mean the rated maximum transmission power (the rated UE maximum transmission power).

[0740] The term "connected", "coupled", or all variations thereof used in the present disclosure, or all variations thereof, means all of the connections or couplings between two or more elements, directly or indirectly, and can include the case where one or more intermediate elements exist between the two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can be rewritten as "accessed".

[0741] In the present disclosure, in the case where two elements are connected, it can be considered that they are "connected" or "coupled" to each other using one or more wires, cables, printed electric connections, and the like, and as several non-limiting and non-inclusive examples, using electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, the light (both visible and invisible) region, and the like.

[0742] In the present disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, the term can also mean "A and B are different from C, respectively". The terms "separated", "coupled", and the like can also be interpreted in the same manner as "different".

[0743] In the present disclosure, in the case where "include", "including", and variations thereof are used, these terms are used in the same sense as the term "comprising". Further, in the present disclosure, the term "or" does not mean the exclusive sense.

[0744] In the present disclosure, in the case where a definite article such as a, an, and the is added by translation, for example, in English, the present disclosure can also include the case where the noun following the definite article is plural.

[0745] In the present disclosure, "below", "less than", "above", "more than", "equal to", and the like can also be rewritten with each other. Further, in the present disclosure, words meaning "good", "bad", "large", "small", "high", "low", "early", "late", "wide", "narrow", and the like are not limited to the original, comparative, and superlative, and can also be rewritten with each other. Further, in the present disclosure, words meaning "good", "bad", "large", "small", "high", "low", "early", "late", "wide", "narrow", and the like, as expressions to which "the ith" (i is an arbitrary integer) is added, are not limited to the original, comparative, and superlative, and can also be rewritten with each other (for example, "highest" can also be rewritten with "the ith highest").

[0746] In the present disclosure, "of", "for", "regarding", "related to", "associated with", and the like can also be rewritten with each other.

[0747] In the present disclosure, "when A, B", "if A, (then) B", "B upon A", "B in response to A", "B based on A", "B during / while A", "B before A", "B at (the same time as) / on A", "B after A", "B since A", "B until A", and the like can be rewritten each other. In addition, A, B, and the like here can be replaced with a noun, a gerund, a general sentence, and the like as appropriate according to the context. In addition, the time difference between A and B can be approximately 0 (immediately after or immediately before). Furthermore, a time offset can be applied to the time at which A occurs. For example, "A" can be rewritten with "A occurs with a time offset before / after". The time offset (for example, one or more symbols / slots) can be predetermined or determined by the UE based on notified information.

[0748] In the present disclosure, timing, time, time instance, arbitrary time unit (for example, slot, sub-slot, symbol, subframe), period, occasion, resource, and the like can be rewritten each other.

[0749] The above has been described in detail for the inventions related to the present disclosure, but the inventions related to the present disclosure are obviously not limited to the embodiments described in the present disclosure for those skilled in the art. The description of the present disclosure is for the purpose of illustration and does not have any limiting meaning on the inventions related to the present disclosure.

Claims

1. A terminal having: a reception unit that receives Downlink Control Information (DCI) indicating a combination of a Category 1 DeModulation Reference Signal (DMRS) port, a Category 2 DMRS port, and a Category 3 DMRS port within at least one Code Division Multiplexing (CDM) group, and scheduling an uplink shared channel for one or two codewords; and a control unit that judges a DMRS port for the uplink shared channel based on the combination, the control unit controls switching of the DMRS port based on information related to the switching of the DMRS port.

2. The terminal according to claim 1, wherein the reception unit receives the information related to the switching of the DMRS port using a Medium Access Control (MAC) Control Element (CE).

3. The terminal according to claim 1, wherein the information related to the switching of the DMRS port is information related to a size of an antenna port field indicating the combination.

4. The terminal according to claim 1, wherein after the reception unit receives the information related to the switching of the DMRS port, the control unit switches the DMRS port after a certain time.

5. A wireless communication method of a terminal having: a step of receiving Uplink Control Information (DCI) indicating a combination of a Category 1 DeModulation Reference Signal (DMRS) port, a Category 2 DMRS port, and a Category 3 DMRS port within at least one Code Division Multiplexing (CDM) group, and scheduling a downlink shared channel for one or two codewords; a step of judging a DMRS port for the downlink shared channel based on the combination; and a step of controlling switching of the DMRS port based on information related to the switching of the DMRS port.

6. A base station having: ​ ​ a transmission unit that, in a case where a combination of a category 1 de-modulation reference signal (DMRS) port, a category 2 DMRS port, and a category 3 DMRS port within at least one code division multiplexing (CDM) group is supported, transmits uplink control information (DCI) indicating the combination and scheduling a downlink shared channel for one or two codewords; and a control unit that controls transmission of the uplink shared channel using a DMRS port for the uplink shared channel that is judged based on the combination, the control unit controls switching of the DMRS port based on information related to the switching of the DMRS port.

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