Terminal and communication method

Abstract

A terminal according to the present invention has: a control unit that determines a number of layers and a number of code words to be applied to a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) physical uplink shared channel (PUSCH), maps each code word onto a plurality of layers, performs precoding as necessary, configures a demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS), and generates a signal for the DFT-s-OFDM PUSCH; and a transmission unit that transmits the signal for the DFT-s-OFDM PUSCH.

Description

Terminal and communication method

[0001] The present invention relates to a terminal and a communication method in a wireless communication system.

[0002] The 3GPP (registered trademark) (3rd Generation Partnership Project) is currently studying a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless communication method will be referred to as "NR") in order to achieve a larger system capacity, a higher data transmission speed, and a lower latency in wireless sections. In 5G, various wireless technologies and network architectures are being studied to meet the requirements of achieving a throughput of 10 Gbps or more while reducing the latency in wireless sections to 1 ms or less (for example, Non-Patent Document 1 and Non-Patent Document 2).

[0003] Furthermore, various requirements are being considered for the next generation, 6G, such as ultra broadband communication, mission critical communication, ultra massive connection, universal coverage, intelligent connection, and ubiquitous sensing.

[0004] To achieve these requirements, new concepts include extensibility (e.g., making it more future-proof), easy-operational, customizable (e.g., making it easier to operate), and sustainability (e.g., reducing costs, having a more robust configuration, and being resilient). Also, guaranteed communication, which always guarantees a minimum level of performance, is being considered.

[0005] 3GPP TS 38.300 V17.6.0 (2023-09)3GPP TS 38.401 V17.6.0 (2023-09)3GPP TS 38.331 V17.6.0 (2023-09)3GPP TS 38.213 V17.7.0 (2023-09)

[0006] It is expected that new waveforms or extended transmission schemes will be supported in the next generation of wireless communication systems to meet their requirements, and therefore it is necessary to specify methods for controlling these new waveforms or extended transmission schemes.

[0007] The present invention has been made in view of the above points, and has as its object to control waveforms and transmission methods in wireless communication systems.

[0008] According to the disclosed technology, there is provided a terminal having a control unit that determines the number of layers and the number of codewords to be applied to a DFT-s-OFDM (Discrete Fourier transform-spread-Orthogonal Frequency Division Multiplexing) PUSCH (Physical Uplink Shared Channel), maps each codeword to multiple layers, performs precoding as necessary, sets a DMRS (Demodulation reference signal) and a PTRS (Phase tracking reference signal), and generates the DFT-s-OFDM PUSCH signal, and a transmission unit that transmits the DFT-s-OFDM PUSCH signal.

[0009] According to the disclosed technology, it is possible to control waveforms and transmission methods in a wireless communication system.

[0010] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system in an embodiment of the present invention. FIG. 2 is a flowchart for explaining an example of transmission in an embodiment of the present invention. FIG. 3 is a diagram for explaining an example of a codebook in an embodiment of the present invention. FIG. 4 is a diagram for explaining an example of TPMI in an embodiment of the present invention. FIG. 5 is a diagram for explaining an example of DMRS in an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of the functional configuration of a base station 10 in an embodiment of the present invention. FIG. 7 is a diagram illustrating an example of the functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 8 is a diagram illustrating an example of the hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention. FIG. 9 is a diagram illustrating an example of the configuration of a vehicle 2001 in an embodiment of the present invention.

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate. However, the existing technology is, for example, the existing LTE, but is not limited to the existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (e.g., NR), unless otherwise specified.

[0013] In addition, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) used in existing LTE are used. This is for convenience of description, and similar signals, functions, etc. may be called by other names. In addition, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if a signal is used in NR, it is not necessarily stated as "NR-".

[0014] Furthermore, in the embodiment of the present invention, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or another method (for example, flexible duplex, etc.).

[0015] Furthermore, in the embodiments of the present invention, "configuring" radio parameters etc. may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0016] Fig. 1 is a diagram showing an example of the configuration of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0017] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is, for example, transmitted via NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may also be referred to as SSB (SS / PBCH block). As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0018] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures propagation path quality based on the reception results of the reference signals.

[0019] Furthermore, various requirements are being considered for the next generation, 6G, such as ultra broadband communication, mission critical communication, ultra massive connection, universal coverage, intelligent connection, ubiquitous sensing, and the like.

[0020] Furthermore, the requirements may be ultra-high speed communication, large capacity communication, ultra-extended coverage, ultra-low power consumption, low cost, ultra-low latency, ultra-reliable communication, ultra-multiple connections and sensing, etc.

[0021] To achieve these requirements, new concepts include extensibility (e.g., making it more future-proof), easy-operational, customizable (e.g., making it easier to operate), and sustainability (e.g., reducing costs, having a more robust configuration, and being resilient). Also, guaranteed communication, which always guarantees a minimum level of performance, is being considered.

[0022] Here, in the prior art, CP-OFDM (Cyclic prefix OFDM) and DFT-s-OFDM (Discrete fourier transform - spread - OFDM) were used for the UL waveform. The default waveform for UL was CP-OFDM, and the upper layer parameter of transform precoder enable / disable could be set for Msg3, PUSCH, CG, MsgA, and DMRS (Demodulation reference signal) for PUCCH formats 3 and 4.

[0023] The higher layer parameters include, for example, the following (see Non-Patent Document 3): msg3-transformPrecoder, included in RACH-ConfigCommon. If the field is empty, the UE disables the transform precoder. transformPrecoder, included in PUSCH-Config. If the field is empty, the UE applies the value of msg3-transformPrecoder included in rach-ConfigCommon, which is directly included in the BWP configuration. transformPrecoder, included in ConfiguredGrantConfig. msgA-TransformPrecoder-r16, included in MsgA-PUSCH-Config-r16. dmrs-UplinkTransformPrecodingPUCCH, included in PUCCH-Config. Used for DMRS for PUCCH formats 3 and 4.

[0024] To support two UL waveforms, the following configurations are supported: DMRS-UplinkConfig PTRS-UplinkConfig

[0025] In addition, dynamic switching between two waveforms is supported for DG-PUSCH by DCI notification (DCI format 0_1 / 0_2). Dynamic waveform switching is configured separately for each BWP in the PUSCH-Config.

[0026] Precoding for PUSCH supports non-coherent, partial-coherent, or fully-coherent codebooks. For DFT-s-OFDM PUSCH, only rank 1 is supported. For CP-OFDM PUSCH, up to rank 4 or up to rank 8 is supported.

[0027] Transmit precoding matrix indicator (TPMI) and rank signaling for PUSCH are supported. Different settings for maximum rank, antenna port, and full power mode are used for different signaling tables. Rank and TPMI index are signaled by bit fields in the UL grant DCI.

[0028] DMRS antenna port signaling for PUSCH is supported. Different signaling tables are used depending on whether transform precoding is applied, rank, DMRS type, and maximum DMRS length. The DMRS port and DMRS length are signaled by bit fields in the UL grant DCI.

[0029] For a phase tracking reference signal (PTRS) for a PUSCH, association between the PTRS and a DMRS is notified by an UL grant DCI. Transmission and reception of a PTRS for a PUSCH or a PDSCH is supported.

[0030] DMRS antenna port signaling for PDSCH is supported. Different signaling tables are used based on the DMRS type and DMRS length. The DMRS port and rank are determined based on bit fields in the DL grant DCI.

[0031] For the existing NR-PUSCH, CP-OFDM and DFT-s-OFDM are supported. Up to 8 layers are supported for CP-OFDM. Only a single layer is supported for DFT-s-OFDM. For the existing NR-PDSCH, only CP-OFDM is supported.

[0032] Here, as a waveform extension, it is assumed that DFT-s-OFDM is applied to DL. It is also assumed that multiple layers are supported for DFT-s-OFDM. The high rank transmission of DFT-s-OFDM improves the performance of UEs at close range. The gain of multi-layer transmission and the gain of power are obtained simultaneously.

[0033] Therefore, the following operations 1) to 9) relating to multi-layer transmission of DFT-s-OFDM may be performed. Note that hereinafter, PUSCH and / or PDSCH may also be referred to as PUSCH / PDSCH.

[0034] Operation 1) Applicability of multi-layer DFT-s-OFDM PUSCH / PDSCH Operation 2) Number of layers of multi-layer DFT-s-OFDM PUSCH / PDSCH Operation 3) Codeword of multi-layer DFT-s-OFDM PUSCH / PDSCH Operation 4) Mapping of number of layers and codewords for multi-layer DFT-s-OFDM PUSCH / PDSCH Operation 5) Mapping of codeword and layer for multi-layer DFT-s-OFDM Operation 6) Precoder and codebook for multi-layer DFT-s-OFDM PUSCH / PDSCH Operation 7) Notification related to precoding information and number of layers for multi-layer DFT-s-OFDM PUSCH / PDSCH Operation 8) Notification related to DMRS antenna port for multi-layer DFT-s-OFDM PUSCH / PDSCH Operation 9) PTRS for multi-layer DFT-s-OFDM PUSCH / PDSCH

[0035] 2 is a flowchart illustrating an example of transmission according to an embodiment of the present invention. In step S101, the terminal 20 or the base station 10 determines the number of layers and the number of codewords. In step S102, the terminal 20 or the base station 10 maps the codewords to layers. In step S103, the terminal 20 or the base station 10 performs precoding as necessary. In step S104, the terminal 20 or the base station 10 configures DMRS and PTRS. In step S105, the terminal 20 or the base station 10 transmits a multi-layer DFT-s-OFDM signal.

[0036] Operation 1) Applicability of multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below.

[0037] Action 1-1) The UE may support multi-layer DFT-s-OFDM for PUSCH transmission in connected mode and may support PUSCH (e.g., Msg3 PUSCH and / or MsgA PUSCH) transmission during initial access.

[0038] Multi-layer DFT-s-OFDM may be supported for one or more of the PUSCH types listed below in 1) and 2).

[0039] 1) DG (Dynamic grant)-PUSCH scheduled by DCI, which may be in a predetermined DCI format or scrambled with a predetermined RNTI, and 2) CG (Configured grant)-PUSCH without dynamic notification (e.g., Type 1 CG) and / or CG-PUSCH with dynamic notification (e.g., Type 2 CG).

[0040] Action 1-2) The UE may support multi-layer DFT-s-OFDM for PDSCH. Multi-layer DFT-s-OFDM may be supported for PDSCH reception in connected mode and for PUSCH (e.g., Msg3 PUSCH and / or MsgA PUSCH) transmission during initial access.

[0041] Multi-layer DFT-s-OFDM may be supported for one or more of the PDSCH types listed below in 1) and 2).

[0042] 1) Dynamic grant (DG)-PDSCH scheduled by DCI, which may be in a predetermined DCI format or scrambled with a predetermined RNTI, and 2) Semi-persistent scheduling (SPS)-PDSCH.

[0043] The above operation 1) can determine whether to apply multi-layer DFT-s-OFDM PUSCH / PDSCH.

[0044] Operation 2) Number of layers of multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below.

[0045] Operation 2-1) The maximum number of layers for a multi-layer DFT-s-OFDM PUSCH may be supported up to the maximum number specified in the specification. Assuming that the maximum number of layers for a DFT-s-OFDM PUSCH is X, multi-layer DFT-s-OFDM may be applied to the PUSCH with a number of layers equal to or less than X. The maximum number of layers for a multi-layer DFT-s-OFDM PUSCH may not exceed a specific value (e.g., 2 or 4), or may exceed a specific value (e.g., 8 or 12).

[0046] The maximum number of layers for a multi-layered DFT-s-OFDM PUSCH may be equal to or less than the maximum number of layers for a CP-OFDM PUSCH. The maximum number of layers for a multi-layered DFT-s-OFDM PUSCH may be equal to or less than the maximum number of layers for a DFT-s-OFDM PDSCH.

[0047] The UE may support a maximum number of layers for DFT-s-OFDM PUSCH as shown in at least one of 1)-4) below.

[0048] 1) The UE may report the maximum number of layers for DFT-s-OFDM PUSCH that it supports as a capability report.

[0049] 2) The maximum number of layers for DFT-s-OFDM supported by a UE may be determined depending on the maximum number of layers supported for CP-OFDM. For example, the maximum number of layers for DFT-s-OFDM may be a percentage of the maximum number of layers for CP-OFDM. For example, the maximum number of layers for DFT-s-OFDM may be a value obtained by dividing the maximum number of layers for CP-OFDM by N, where N may be greater than or equal to 1. The maximum number of layers for DFT-s-OFDM may be a value smaller than the maximum number of layers for CP-OFDM and a predefined value. For example, the maximum number of layers for DFT-s-OFDM may be the smaller of the maximum number of layers for CP-OFDM and a predefined value X (min{maximum number of layers for CP-OFDM, X}), where X may be a value defined in the specification.

[0050] 3) The maximum number of layers for DFT-s-OFDM supported by the UE may be determined based on the maximum number of codewords for DFT-s-OFDM PUSCH supported by the UE and the mapping of codewords to layers. For example, if the UE supports K codewords for DFT-s-OFDM PUSCH, the UE may support X0×K as the maximum number of layers for DFT-s-OFDM. X0 may be the maximum number of layers per codeword, and X0 may be defined in the specification or reported by the UE capabilities. The maximum number of layers supported by the UE may be equal to the maximum number of codewords supported by the UE.

[0051] 4) The maximum number of layers for a multi-layered DFT-s-OFDM PUSCH supported by the UE may be equal to, greater than, not greater than, less than or not less than the maximum number of layers for a multi-layered DFT-s-OFDM PDSCH supported by the UE.

[0052] The maximum rank for DFT-s-OFDM PUSCH may be set as shown in 1)-4) below.

[0053] 1) The maximum rank for the DFT-s-OFDM PUSCH may be explicitly configured by the gNB. For example, the maximum rank for the DFT-s-OFDM PUSCH may be configured independently of the maximum rank for the CP-OFDM PUSCH.

[0054] For example, a common maximum rank may be configured in the information element pusch-Config, which may apply to all DFT-s-OFDM DG-PUSCHs and / or all DFT-s-OFDM CG-PUSCHs.

[0055] For example, a separate maximum rank may be configured for each UL grant DCI format. That is, a separate maximum rank may be configured for each PUSCH scheduled by the DCI format. The maximum rank may be configured in the information element ConfiguredGrantConfig for each CG-PUSCH configuration. Furthermore, the maximum rank configuration for CP-OFDM may be applied to DFT-s-OFDM.

[0056] For example, the maximum rank for DFT-s-OFDM PUSCH may be determined depending on the maximum rank setting for CP-OFDM PUSCH. For example, the maximum rank for DFT-s-OFDM may be a certain percentage of the maximum rank for CP-OFDM. For example, the maximum rank for DFT-s-OFDM may be a value obtained by dividing the maximum rank for CP-OFDM by N, where N may be greater than or equal to 1. The maximum rank for DFT-s-OFDM may be the maximum rank for CP-OFDM and a smaller maximum rank than a predefined value. For example, the maximum rank for DFT-s-OFDM may be the smaller of the maximum rank for CP-OFDM and a predefined value X (min{maximum rank for CP-OFDM, X}), where X may be a value defined in the specifications.

[0057] 3) The maximum rank number for DFT-s-OFDM supported by the UE may be determined based on the maximum number of codewords for DFT-s-OFDM PUSCH supported by the UE and the mapping of codewords to layers. For example, if the UE supports K codewords for DFT-s-OFDM PUSCH, the UE may support X0 × K as the maximum rank number for DFT-s-OFDM. X0 may be the maximum rank number per codeword, and X0 may be defined in the specification or reported in the UE capabilities. The maximum rank number supported by the UE may be equal to the maximum number of codewords supported by the UE.

[0058] 4) The maximum rank number for the multi-layered DFT-s-OFDM PUSCH supported by the UE may be equal to, greater than, not greater than, less than or not less than the maximum rank number for the multi-layered DFT-s-OFDM PDSCH supported by the UE.

[0059] The scheduled or actual rank for a DFT-s-OFDM PUSCH transmission may be signaled by the Transmit Rank Indicator (TRI) and / or TPMI in case of codebook-based PUSCH transmission and / or the SRS resource indicator (SRI) in case of non-codebook-based PUSCH transmission. Alternatively, the scheduled or actual rank for a DFT-s-OFDM PUSCH transmission may be explicitly signaled by a field in the scheduling DCI. Alternatively, the scheduled or actual rank for a DFT-s-OFDM PUSCH transmission may be equal to the number of codewords scheduled for that PUSCH.

[0060] Operation 2-2) The maximum number of layers for a multi-layer DFT-s-OFDM PDSCH may be supported up to the maximum number specified in the specification. Assuming that the maximum number of layers for a DFT-s-OFDM PDSCH is X, multi-layer DFT-s-OFDM may be applied to the PDSCH with a number of layers equal to or less than X. The maximum number of layers for a multi-layer DFT-s-OFDM PDSCH may not exceed a specific value (e.g., 2 or 4), or may exceed a specific value (e.g., 8 or 12).

[0061] The maximum number of layers for a multi-layered DFT-s-OFDM PDSCH may be equal to or less than the maximum number of layers for a CP-OFDM PDSCH. The maximum number of layers for a multi-layered DFT-s-OFDM PDSCH may be equal to or less than the maximum number of layers for a DFT-s-OFDM PUSCH.

[0062] The UE may support a maximum number of layers for DFT-s-OFDM PDSCH as shown in at least one of 1)-4) below.

[0063] 1) The UE may report the maximum number of layers it supports for DFT-s-OFDM PDSCH as a capability report.

[0064] 2) The maximum number of layers for DFT-s-OFDM supported by a UE may be determined depending on the maximum number of layers supported for CP-OFDM. For example, the maximum number of layers for DFT-s-OFDM may be a percentage of the maximum number of layers for CP-OFDM. For example, the maximum number of layers for DFT-s-OFDM may be a value obtained by dividing the maximum number of layers for CP-OFDM by N, where N may be greater than or equal to 1. The maximum number of layers for DFT-s-OFDM may be a value smaller than the maximum number of layers for CP-OFDM and a predefined value. For example, the maximum number of layers for DFT-s-OFDM may be the smaller of the maximum number of layers for CP-OFDM and a predefined value X (min{maximum number of layers for CP-OFDM, X}), where X may be a value defined in the specification.

[0065] 3) The maximum number of layers for DFT-s-OFDM supported by the UE may be determined based on the maximum number of codewords for DFT-s-OFDM PDSCH supported by the UE and the mapping of codewords to layers. For example, if the UE supports K codewords for DFT-s-OFDM PDSCH, the UE may support X0 x K as the maximum number of layers for DFT-s-OFDM. X0 may be the maximum number of layers per codeword, and X0 may be defined in the specification or reported by the UE capabilities. The maximum number of layers supported by the UE may be equal to the maximum number of codewords supported by the UE.

[0066] 4) The maximum number of layers for a multi-layered DFT-s-OFDM PDSCH supported by the UE may be equal to, greater than, not greater than, less than or not less than the maximum number of layers for a multi-layered DFT-s-OFDM PUSCH supported by the UE.

[0067] The maximum rank for DFT-s-OFDM PDSCH may be set as shown in 1)-4) below.

[0068] 1) The maximum rank for the DFT-s-OFDM PDSCH may be explicitly configured by the gNB, for example, the maximum rank for the DFT-s-OFDM PUSCH may be configured independently of the maximum rank for the CP-OFDM PDSCH.

[0069] For example, a common maximum rank may be configured in the information element pdsch-Config, which may apply to all DFT-s-OFDM DG-PDSCHs and / or all DFT-s-OFDM SPS-PUSCHs.

[0070] For example, a separate maximum rank may be set for each DL grant DCI format. That is, a separate maximum rank may be set for each PDSCH scheduled by the DCI format. A maximum rank may be set in the information element SPS-Config for each SPS-PDSCH configuration.

[0071] For example, the maximum rank for the DFT-s-OFDM PDSCH may be determined depending on the maximum rank setting for the CP-OFDM PDSCH. For example, the maximum rank for the DFT-s-OFDM may be a certain percentage of the maximum rank for the CP-OFDM. For example, the maximum rank for the DFT-s-OFDM may be a value obtained by dividing the maximum rank for the CP-OFDM by N, where N may be greater than or equal to 1. The maximum rank for the DFT-s-OFDM may be the maximum rank for the CP-OFDM and a smaller maximum rank than a predefined value. For example, the maximum rank for the DFT-s-OFDM may be the smaller of the maximum rank for the CP-OFDM and a predefined value X (min{maximum rank for CP-OFDM, X}), where X may be a value defined in the specifications.

[0072] 3) The maximum rank number for DFT-s-OFDM supported by the UE may be implicitly determined based on the maximum number of codewords for DFT-s-OFDM PUSCH supported by the UE and the mapping of codewords to layers. For example, if a UE supports K codewords for DFT-s-OFDM PDSCH, the UE may support X0 × K as the maximum rank number for DFT-s-OFDM. X0 may be the maximum rank number per codeword, and X0 may be defined in the specification or reported in the UE capabilities. The maximum rank number supported by the UE may be equal to the maximum number of codewords supported by the UE.

[0073] 4) The maximum rank number for multi-layer DFT-s-OFDM PDSCH supported by the UE may be equal to, greater than, not greater than, less than or not less than the maximum rank number for multi-layer DFT-s-OFDM PUSCH supported by the UE.

[0074] The scheduled rank for a DFT-s-OFDM PDSCH transmission may be determined based on antenna port signaling, may be explicitly signaled by a field in the scheduling DCI, or may be equal to the number of codewords scheduled for that PDSCH.

[0075] The above operation 2) makes it possible to determine the maximum number of layers and the maximum number of ranks to be applied to the multi-layer DFT-s-OFDM.

[0076] Operation 3) Codewords for Multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below.

[0077] Operation 3-1) The number of codewords for multi-layer DFT-s-OFDM PUSCH may be determined as follows.

[0078] The maximum number of codewords for the multi-layer DFT-s-OFDM PUSCH may be specified. The maximum number of codewords for the multi-layer DFT-s-OFDM PUSCH may be 1, 2, or more than 2. The maximum number of codewords for the multi-layer DFT-s-OFDM PUSCH may be equal to, greater than, or less than the maximum number of codewords for the CP-OFDM PUSCH. The maximum number of codewords for the multi-layer DFT-s-OFDM may be equal to, greater than, or less than the maximum number of codewords for the DFT-s-OFDM PDSCH. The maximum number of codewords for the multi-layer DFT-s-OFDM may be determined based on the codeword-to-layer mapping and dependent on the maximum number of layers for the DFT-s-OFDM PUSCH. For example, if a specification supports a maximum number of layers Y for DFT-s-OFDM PUSCH, then the maximum number of codewords supported for DFT-s-OFDM in the specification may be Y / X0, where X0 may be the maximum number of layers per codeword. The maximum number of codewords for DFT-s-OFDM in the specification may be equal to the maximum number of layers in the specification.

[0079] The UE may support a maximum number of codewords for DFT-s-OFDM PUSCH as shown in at least one of 1)-4) below.

[0080] 1) The UE may report the maximum number of codewords for DFT-s-OFDM PUSCH that it supports as a capability report.

[0081] 2) The maximum number of codewords for DFT-s-OFDM supported by the UE may be determined depending on the maximum number of codewords for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be a percentage of the maximum number of codewords for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be the maximum number of codewords for CP-OFDM divided by N, where N may be greater than or equal to 1. The maximum number of codewords for DFT-s-OFDM may be the maximum number of codewords for CP-OFDM and a smaller maximum codeword number than a predefined value. For example, the maximum number of codewords for DFT-s-OFDM may be the smaller of the maximum number of codewords for CP-OFDM and a predefined value X (min{maximum number of codewords for CP-OFDM, X}), where X may be a value defined in the specifications.

[0082] 3) The maximum number of codewords for the DFT-s-OFDM PUSCH supported by the UE may be determined based on the maximum number of layers for the DFT-s-OFDM PUSCH supported by the UE and the mapping of codewords to layers. For example, if the UE supports a maximum of Y layers for the DFT-s-OFDM PUSCH, the UE may support a maximum number of codewords for the DFT-s-OFDM PUSCH of Y / X0. X0 may be the maximum number of layers per codeword, and X0 may be defined in the specification or reported by the UE capabilities. The maximum number of codewords supported by the UE may be equal to the maximum number of layers supported by the UE.

[0083] 4) The maximum number of codewords for the multi-layered DFT-s-OFDM PUSCH supported by the UE may be equal to, greater than, not greater than, less than or not less than the maximum number of codewords for the multi-layered DFT-s-OFDM PDSCH supported by the UE.

[0084] The UE may configure the maximum number of codewords for DFT-s-OFDM PUSCH as shown in at least one of 1)-3) below.

[0085] 1) The maximum number of codewords configured for the multi-layer DFT-s-OFDM PUSCH may be explicitly configured by RRC signaling. For example, the RRC parameters included in the pusch-Config may be configured to enable or disable two codewords of the DFT-s-OFDM PUSCH for each UL grant DCI format. For example, the RRC parameters included in the ConfiguredGrantConfig may be configured to enable or disable two codewords of the DFT-s-OFDM PUSCH for each CG-PUSCH configuration.

[0086] 2) The maximum number of codewords configured for the multi-layer DFT-s-OFDM PUSCH may be determined based on the maximum rank configured for the multi-layer DFT-s-OFDM PUSCH and the codeword-to-layer mapping. For example, if the UE configures a maximum of Y layers for the DFT-s-OFDM PUSCH, the UE may configure Y / X0 as the maximum number of codewords for DFT-s-OFDM. X0 may be the maximum number of layers per codeword, and X0 may be defined in the specification or configured by the base station 10. The maximum number of codewords configured by the UE may be equal to the maximum number of layers supported by the UE.

[0087] 3) The maximum number of codewords for DFT-s-OFDM PUSCH configured in the UE may be determined depending on the maximum number of codewords configured for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be a percentage of the maximum number of codewords for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be a value obtained by dividing the maximum number of codewords for CP-OFDM by N, where N may be greater than or equal to 1. The maximum number of codewords for DFT-s-OFDM may be the maximum number of codewords for CP-OFDM and a smaller maximum codeword number than a predefined value. For example, the maximum number of codewords for DFT-s-OFDM may be the smaller of the maximum number of codewords for CP-OFDM and a predefined value X (min{maximum number of codewords for CP-OFDM, X}), where X may be a value defined in the specifications. Furthermore, the maximum number of codewords for the multi-layer DFT-s-OFDM PUSCH configured in the UE may be equal to, greater than, not greater than, smaller than, or not smaller than the maximum number of codewords for the multi-layer DFT-s-OFDM PDSCH configured in the UE.

[0088] If more than one codeword is configured or supported, the number of scheduled or actual codewords for the DFT-s-OFDM PUSCH may be determined as shown in 1) or 2) below.

[0089] 1) The number of scheduled or actual codewords for the DFT-s-OFDM PUSCH may be determined based on the number of scheduled layers and the mapping from codewords to layers. For example, if Y layers are scheduled for the DFT-s-OFDM PUSCH, the number of codewords may be determined as ceil(Y / X0), where X0 may be the maximum number of layers per codeword, and X0 may be defined in the specifications or configured by the base station 10. The maximum number of codewords configured by the UE may be equal to the maximum number of layers supported by the UE. For example, the number of scheduled or actual codewords for the DFT-s-OFDM PUSCH may be equal to the minimum between the number of scheduled layers configured for the DFT-s-OFDM PUSCH and the maximum number of supported or configured codewords.

[0090] 2) The number of scheduled or actual codewords for the DFT-s-OFDM PUSCH may be signaled by the scheduling DCI. For example, it may be signaled by a field that explicitly signals the number of codewords. For example, it may be implicitly determined based on the bits or values ​​of a combination of other fields (MCS and RV) included in the scheduling DCI. For example, when the values ​​of MCS and RV satisfy a condition (e.g., MCS=x, RV=y), two codewords may be scheduled.

[0091] Operation 3-2) The number of codewords for multi-layer DFT-s-OFDM PDSCH may be determined as follows.

[0092] The maximum number of codewords for a multi-layer DFT-s-OFDM PDSCH may be specified. The maximum number of codewords for a multi-layer DFT-s-OFDM PDSCH may be 1, 2, or more than 2. The maximum number of codewords for a multi-layer DFT-s-OFDM PDSCH may be equal to, greater than, or less than the maximum number of codewords for a CP-OFDM PDSCH. The maximum number of codewords for a multi-layer DFT-s-OFDM PDSCH may be equal to, greater than, or less than the maximum number of codewords for a DFT-s-OFDM PUSCH. The maximum number of codewords for a multi-layer DFT-s-OFDM may be determined based on a codeword-to-layer mapping and dependent on the maximum number of layers for DFT-s-OFDM. For example, if a specification supports a maximum number of layers Y for a DFT-s-OFDM PDSCH, then the maximum number of codewords supported for DFT-s-OFDM in the specification may be Y / X0, where X0 may be the maximum number of layers per codeword. The maximum number of codewords for DFT-s-OFDM in the specification may be equal to the maximum number of layers in the specification.

[0093] The UE may support a maximum number of codewords for DFT-s-OFDM PDSCH as shown in at least one of 1)-4) below.

[0094] 1) The UE may report the maximum number of codewords for DFT-s-OFDM PDSCH that it supports as a capability report.

[0095] 2) The maximum number of codewords for DFT-s-OFDM supported by the UE may be determined depending on the maximum number of codewords for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be a percentage of the maximum number of codewords for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be the maximum number of codewords for CP-OFDM divided by N, where N may be greater than or equal to 1. The maximum number of codewords for DFT-s-OFDM may be the maximum number of codewords for CP-OFDM and a smaller maximum codeword number than a predefined value. For example, the maximum number of codewords for DFT-s-OFDM may be the smaller of the maximum number of codewords for CP-OFDM and a predefined value X (min{maximum number of codewords for CP-OFDM, X}), where X may be a value defined in the specifications.

[0096] 3) The maximum number of codewords for the DFT-s-OFDM PDSCH supported by the UE may be determined based on the maximum number of layers for the DFT-s-OFDM PDSCH supported by the UE and the mapping of codewords to layers. For example, if the UE supports a maximum of Y layers for the DFT-s-OFDM PDSCH, the UE may support a maximum number of codewords for DFT-s-OFDM of Y / X0, where X0 may be the maximum number of layers per codeword, and X0 may be defined in the specification or reported by the UE capabilities. The maximum number of codewords supported by the UE may be equal to the maximum number of layers supported by the UE.

[0097] 4) The maximum number of codewords for multi-layered DFT-s-OFDM PDSCH supported by the UE may be equal to, greater than, not greater than, less than or not less than the maximum number of codewords for multi-layered DFT-s-OFDM PUSCH supported by the UE.

[0098] The UE may configure the maximum number of codewords for the DFT-s-OFDM PDSCH as shown in at least one of 1)-3) below.

[0099] 1) The maximum number of codewords configured for the multi-layer DFT-s-OFDM PDSCH may be explicitly configured by RRC signaling. For example, the RRC parameters included in pdsch-Config may be configured to enable or disable two codewords of the DFT-s-OFDM PDSCH for each DL grant DCI format. For example, the RRC parameters included in SPS-Config may be configured to enable or disable two codewords of the DFT-s-OFDM PDSCH for each SPS-PDSCH configuration.

[0100] 2) The maximum number of codewords configured for the multi-layer DFT-s-OFDM PDSCH may be determined based on the maximum rank configured for the multi-layer DFT-s-OFDM PDSCH and the codeword-to-layer mapping. For example, if the UE configures a maximum of Y layers for the DFT-s-OFDM PDSCH, the UE may configure Y / X0 as the maximum number of codewords for DFT-s-OFDM. X0 may be the maximum number of layers per codeword, and X0 may be defined in the specification or configured by the base station 10. The maximum number of codewords configured by the UE may be equal to the maximum number of layers supported by the UE.

[0101] 3) The maximum number of codewords for the DFT-s-OFDM PDSCH configured in the UE may be determined depending on the maximum number of codewords configured for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be a percentage of the maximum number of codewords for CP-OFDM. For example, the maximum number of codewords for DFT-s-OFDM may be a value obtained by dividing the maximum number of codewords for CP-OFDM by N, where N may be greater than or equal to 1. The maximum number of codewords for DFT-s-OFDM may be the maximum number of codewords for CP-OFDM and a maximum codeword number that is smaller than a predefined value. For example, the maximum number of codewords for DFT-s-OFDM may be the smaller of the maximum number of codewords for CP-OFDM and a predefined value X (min{maximum number of codewords for CP-OFDM, X}), where X may be a value defined in the specifications. Furthermore, the maximum number of codewords for the multi-layer DFT-s-OFDM PDSCH configured in the UE may be equal to, greater than, not greater than, smaller than, or not smaller than the maximum number of codewords for the multi-layer DFT-s-OFDM PUSCH configured in the UE.

[0102] If more than one codeword is configured or supported, the number of scheduled or actual codewords for the DFT-s-OFDM PDSCH may be determined as shown in 1) or 2) below.

[0103] 1) The number of codewords scheduled for the DFT-s-OFDM PDSCH may be signaled by the DL grant DCI. For example, the number of codewords may be signaled explicitly by a field, or may be implicitly determined based on the bits or values ​​of a combination of other fields (MCS and RV). For example, when the values ​​of MCS and RV satisfy a condition (e.g., MCS=x, RV=y), two codewords may be scheduled.

[0104] 2) The number of scheduled or actual codewords for the DFT-s-OFDM PDSCH may be determined based on the number of layers to be scheduled. For example, if Y layers are scheduled for the DFT-s-OFDM PDSCH, the number of codewords may be determined as ceil(Y / X0), where X0 may be the maximum number of layers per codeword, and X0 may be defined in the specifications or configured in the base station 10. The number of scheduled codewords may be equal to the number of layers of the DFT-s-OFDM PDSCH to be scheduled. For example, the number of codewords scheduled for the DFT-s-OFDM PDSCH may be equal to the minimum between the number of scheduled layers configured for the DFT-s-OFDM PDSCH and the supported or configured maximum number of codewords.

[0105] The number of codewords to be applied to multi-layer DFT-s-OFDM can be determined by the above operation 3).

[0106] Operation 4) Mapping of the number of layers and the number of codewords for multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below.

[0107] For multi-layer DFT-s-OFDM, the association between the number of codewords and the number of layers may be defined as option 1) or option 2) shown below.

[0108] Option 1) For a certain number of layers, the number of codewords corresponding to or to be mapped may be determined. Let the number of layers be Y (Y>0): If Y is less than or equal to X(1), then one codeword may be mapped to the Y layer. If Y is greater than X(1) and less than or equal to X(2), then two codewords may be mapped to the Y layer. Similarly, if Y is greater than X(k-1) and less than or equal to X(k), then k codewords may be mapped to the Y layer.

[0109] where X(k), k=1, 2, ..., N, indicates the threshold number of layers for determining k codewords. The value of X(k) may be defined in the specifications and / or set by the base station 10. The value of X(k) may be X0 x k. X0 may be defined in the specifications. For example, X0 may be 4, less than 4, or greater than 4. X0 corresponds to the maximum number of layers per codeword. Option 1 in Table 1 shows an example where X0=4.

[0110]

[0111] Option 2) For a certain number of layers, up to k codewords may be mapped, where k is a value that does not exceed the number of layers and the maximum number of codewords supported by the specification. For a number of layers greater than 1, a set of possible values ​​for the number of codewords may correspond. Let the number of layers be Y (Y>0): If Y=1, one codeword is mapped to one layer. If Y>1, k codewords are mapped to Y layers. k is an integer between k_min and k_max.

[0112] Let k_max=min(Y, M), where M is the maximum number of codewords supported by the specifications, or the maximum number of codewords supported by the UE capability, or the maximum number of codewords set by the base station 10 .

[0113] If there is no limit to the number of layers to which one codeword is mapped, then K_min = 1. Alternatively, if the number of layers to which one codeword is mapped does not exceed X0, then K_min = floor(Y / X0). Option 2 in Table 1 shows an example where X0 = 4.

[0114] The determination of k may be based on a specification and / or may be configured, notified, or scheduled by the base station 10. For example, k = k_max may be defined in the specification. One codeword may be mapped to one layer, i.e., 1-to-1 CW-to-layer mapping may be performed.

[0115] In option 2), the maximum rank and the maximum number of codewords may be set separately, and / or the scheduled or actual rank and the scheduled or actual number of codewords may be signaled separately.

[0116] By the above operation 4), it is possible to determine the mapping between the number of codewords and the number of layers to be applied to the multi-layer DFT-s-OFDM.

[0117] Operation 5) Mapping of codewords and layers for multi-layer DFT-s-OFDM will be described below.

[0118] For multi-layer DFT-s-OFDM, when k codewords are mapped to Y layers, they may be mapped as described in 1) and 2) below.

[0119] 1) When codewords are mapped to layers, codewords with lower indices may be mapped first. After the codeword with the lowest index reaches the maximum number of layers per codeword, codewords with the next highest index may be mapped to the remaining layers. Table 2 shows an example where the maximum number of layers per codeword is 4.

[0120]

[0121] For example, each codeword with index i (0≦i<k−1) may be mapped from layer #(X×i) to layer #(X×i+X−1), and the last codeword with index #(k−1) may be mapped from layer #(X×k−X) to layer #(Y−1).

[0122] X is the maximum number of layers per codeword. The value of X may be defined in a specification and / or configured in the base station 10. The value of X may be 4, or may be less than 4, or may be greater than 4.

[0123] 2) The k codewords may be mapped to the Y layers such that there is an equal or nearly equal number of layers for each codeword.

[0124] 2A) The same codeword may be mapped to consecutive layers. For example, the k0 codeword with lower index (k0=mod(Y,k)) may be mapped to the X1=ceil(Y / k) layer. The (k-k0) codeword with higher index (k0=mod(Y,k)) may be mapped to the X1=floor(Y / k) layer.

[0125] Each codeword of index #i (0≦i<k0) may be mapped from layer #(X1×i) to layer #(X1×i+X1−1).

[0126] Each codeword of index #i (k0≦i<k) may be mapped from layer #(X1×k0+(i−k0)×X2) to layer #(X1×k0+(i−k0)×X2+X2−1).

[0127] Also, for example, k0 codewords with higher indices (k0=mod(Y,k)) may be mapped to X1=ceil(Y / k) layers, and (k-k0) codewords with lower indices (k0=mod(Y,k)) may be mapped to X1=floor(Y / k) layers.

[0128] Each codeword of index #i (0≦i<k−k0) may be mapped from layer #(X2×i) to layer #(X2×i+X2−1).

[0129] Each codeword of index #i (k-k0≦i<k) may be mapped from layer #(X2×(k-k0)+(i-k+k0)×X2) to layer #(X2×(k-k0)+(i-k+k0)×X2+X2-1).

[0130] Table 3 shows an example of mapping according to 2A).

[0131]

[0132] 2B) k codewords may be cyclically mapped to Y layers. For example, a codeword with index #i may be mapped to layer #(i+N×k), N=0, 1, 2,..., ceil(Y / k), where i+N×k<Y. Table 4 shows an example of a mapping according to 2B).

[0133]

[0134] Here, k is the number of codewords and may be determined from option 1) or option 2) of operation 4. The above 1) may be applied to option 1) of operation 4, and the above 2) may be applied to option 1) and option 2) of operation 4.

[0135] Operations 4) and 5) may be applicable to a DFT-s-OFDM PUSCH and / or a DFT-s-OFDM PDSCH. Operations 4) and 5) may be applicable to a CP-OFDM PUSCH and / or a CP-OFDM PDSCH. Operations 4) and 5) may be applicable to a PUSCH and / or a PDSCH having another waveform. The other waveform may be a waveform of another low-PAPR modulation scheme, such as amplitude and phase-shift keying (APSK) or alpha*phi-BPSK (binary phase-shift keying).

[0136] By the above operation 5), codewords can be mapped to layers in multi-layer DFT-s-OFDM.

[0137] Operation 6) Precoder and codebook for multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below.

[0138] Action 6-1) The UL precoder and codebook for DFT-s-OFDM PUSCH with rank greater than 1 may be as described below.

[0139] Separate, different or new UL and DL precoders, codebooks or precoding matrices may be introduced or supported for DFT-s-OFDM PUSCH or PDSCH with rank greater than 1.

[0140] For the UL codebook of the DFT-s-OFDM PUSCH, non-coherent, partially coherent and / or fully coherent codebooks may be supported. The coherent types of precoders supported or defined for the DFT-s-OFDM PUSCH may be different for different ranks.

[0141] 3 is a diagram illustrating an example of a codebook in an embodiment of the present invention. As shown in FIG. 3, all non-coherent codebooks or precoding matrices for CP-OFDM may be reused for DFT-s-OFDM PUSCH with rank greater than 1.

[0142] Also, as shown in Figure 3, all or part of the partially coherent codebook or precoding matrix for CP-OFDM may be reused or adapted for DFT-s-OFDM PUSCH with rank greater than 1. For example, a partially coherent codebook with each row containing only one non-zero element may be reused for DFT-s-OFDM. A different or new partially coherent codebook or precoding matrix (with low PAPR) may be introduced or supported for DFT-s-OFDM PUSCH with rank greater than 1.

[0143] All or some of the fully coherent codebooks or precoding matrices of the corresponding rank for CP-OFDM may be reused or applied for DFT-s-OFDM PUSCHs of rank greater than 1. Different or new fully coherent codebooks or precoding matrices (with low PAPR properties) may be introduced or supported for DFT-s-OFDM PUSCHs of rank greater than 1.

[0144] DFT-s-OFDM with a rank greater than 1 may or may not be supported or applied when ul-FullPowerTransmission (see non-patent documents 3 and 4) is fullpowerMode1, fullpowerMode2, fullpower, or not configured.

[0145] Restrictions or principles may be applicable to the UL codebook for multi-layer DFT-s-OFDM. For example, to ensure low PAPR, one layer may be mapped to one antenna port, or mapping of multiple layers to one antenna port may not be supported. Also, the precoding matrix for DFT-s-OFDM may have only one non-zero element per row.

[0146] Action 6-2) DL codebook for DFT-s-OFDM PDSCH with rank greater than 1 may be as follows:

[0147] For DFT-s-OFDM, new DL codebooks (e.g., with low PAPR) may be introduced or supported, and some codebooks of a given codebook type or mode with corresponding rank for CP-OFDM may be reusable or applicable for DFT-s-OFDM.

[0148] For example, the current DL codebook only supports fully coherent precoders. For new waveforms of DFT-s-OFDM, new non-coherent and / or partially coherent precoders may be introduced. For example, the UL non-coherent and / or partially coherent precoders may be reused.

[0149] Restrictions or principles may be applicable to the DL codebook for multi-layer DFT-s-OFDM. For example, to ensure low PAPR, one layer may be mapped to one antenna port, or mapping of multiple layers to one antenna port may not be supported. Also, the precoding matrix for DFT-s-OFDM may have only one non-zero element per row.

[0150] By the above operation 6), precoding can be applied in multi-layer DFT-s-OFDM.

[0151] Operation 7) Notification of precoding information and number of layers for multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below. This notification may be performed as shown in 1) or 2) below.

[0152] 1) Separate tables of UL precoding matrices or codebooks for each rank greater than 1 (hereinafter referred to as "W-tables") may be defined for the DFT-s-OFDM PUSCH and the CP-OFDM PUSCH.

[0153] 1-1) The number of precoding matrices or codebooks with a rank greater than 1 in the W table for the DFT-s-OFDM PUSCH may be the same as the number of precoding matrices or codebooks with a rank greater than 1 in the W table for the CP-OFDM PUSCH. The table of TMPI index and layer number for the CP-OFDM PUSCH (hereinafter referred to as the "TPMI table") may be reused for the DFT-s-OFDM PUSCH. Table 5 shows an example of the W table for the DFT-s-OFDM PUSCH and the CP-OFDM PUSCH in 1-1). Table 6 shows an example of the TPMI table in 1-1).

[0154]

[0155]

[0156] For example, when the codebookSubset is nonCoherent and index 9 is indicated by DCI, the UE selects a precoding matrix with two layers and TPMI=5 from the W table of Table 5 based on Table 6.

[0157] 1-2) The number of precoding matrices or codebooks with ranks greater than 1 in the W table for the DFT-s-OFDM PUSCH may be smaller or larger than the number of precoding matrices or codebooks with ranks greater than 1 in the W table for the CP-OFDM PUSCH. A separate or different TPMI table may be supported or implemented for the DFT-s-OFDM PUSCH with ranks greater than 1 from that for the CP-OFDM PUSCH.

[0158] If a fully coherent codebook or precoder is not supported for a DFT-s-OFDM PUSCH of rank greater than 1, the TPMI table for the DFT-s-OFDM PUSCH may not include the case where the codebookSubset is fullyAndPartialAndNonCoherent. If a fully coherent and partially coherent codebook or precoder is not supported for a DFT-s-OFDM PUSCH of rank greater than 1, the TPMI table for the DFT-s-OFDM PUSCH may only include the case where the codebookSubset is NonCoherent.

[0159] The number of UL precoding matrices or codebooks for a DFT-s-OFDM PUSCH of rank not less than maxRank may be smaller or larger than the number for a CP-OFDM PUSCH. The field sizes of the precoding information and number of layers for scheduling a DFT-s-OFDM PUSCH may be smaller or larger than the field sizes of the DCI for scheduling a CP-OFDM PUSCH of the corresponding maxRank.

[0160] Table 7 shows an example of a W table for the DFT-s-OFDM PUSCH in 1-2), and Table 5 shows an example of a W table for the CP-OFDM PUSCH. Table 8 shows an example of a TPMI table for the DFT-s-OFDM PUSCH in 1-2). Table 9 shows an example of a TPMI table for the CP-OFDM PUSCH in 1-2).

[0161]

[0162]

[0163]

[0164] For example, when a DFT-s-OFDM PUSCH is scheduled and an index is indicated by DCI, the UE selects a corresponding precoding matrix from the W table of Table 7 based on Table 8. For example, when a CP-OFDM PUSCH is scheduled and an index is indicated by DCI, the UE selects a corresponding precoding matrix from the W table of Table 5 based on Table 9.

[0165] 2) A common W table for each rank greater than one may be used for DFT-s-OFDM and CP-OFDM PUSCH. For example, in the W table, some precoding matrices or codebooks may be applicable to both DFT-s-OFDM and CP-OFDM, and some precoding matrices or codebooks may be applicable only to either DFT-s-OFDM or CP-OFDM. Also, a different or new precoding matrix or codebook may be introduced into the W table for DFT-s-OFDM.

[0166] 2-1) For TPMI and rank signaling, the same TPMI table may be used for CP-OFDM and DFT-s-OFDM for a given or identical maxRank. The UE may always assume that the precoding matrix or codebook associated with the signaled TPMI index and rank number is applicable to the waveform type of the scheduled PUSCH. For example, if the DCI schedules a DFT-s-OFDM PUSCH, the UE may assume that the signaled rank and precoding matrix or codebook are applicable to the DFT-s-OFDM PUSCH. For example, if the DCI schedules a CP-OFDM PUSCH, the UE may assume that the signaled rank and precoding matrix or codebook are applicable to the CP-OFDM PUSCH.

[0167] 2-2) For TPMI and rank signaling, separate or different TPMI tables may be used for CP-OFDM and DFT-s-OFDM for a given or identical maxRank. Only TPMI indices corresponding to precoding matrices or codebooks applicable to DFT-s-OFDM may be signaled or included in the TPMI table for DFT-s-OFDM. Only TPMI indices corresponding to precoding matrices or codebooks applicable to CP-OFDM may be signaled or included in the TPMI table for CP-OFDM.

[0168] The field sizes of the precoding information and number of layers in the DCI for scheduling the DFT-s-OFDM PUSCH may depend on a new or separate TPMI table for DFT-s-OFDM, and the field sizes may be smaller than when the CP-OFDM PUSCH is scheduled.

[0169] If a fully coherent codebook or precoder is not supported for a DFT-s-OFDM PUSCH of rank greater than 1, the TPMI table for the DFT-s-OFDM PUSCH may not include the case where the codebookSubset is fullyAndPartialAndNonCoherent. If a fully coherent and partially coherent codebook or precoder is not supported for a DFT-s-OFDM PUSCH of rank greater than 1, the TPMI table for the DFT-s-OFDM PUSCH may only include the case where the codebookSubset is NonCoherent.

[0170] Table 10 shows an example of a common W table for the DFT-s-OFDM PUSCH and CP-OFDM PUSCH in 2-2). Table 11 shows an example of a TPMI table for the DFT-s-OFDM PUSCH in 2-2). Figure 4 shows an example of a TPMI table for the DFT-s-OFDM PUSCH in 2-2).

[0171]

[0172]

[0173] Among the precoding matrices shown in Table 10, those marked with * may be applied for the DFT-s-OFDM PUSCH. As shown in Table 11, if the scheduled PUSCH is DFT-s-OFDM, the UE may not assume that the notified TPMI index is not applicable to DFT-s-OFDM. As shown in Figure 4, if the TPMI table is for DFT-s-OFDM, the UE may assume that only TPMI indices applicable to DFT-s-OFDM are included in the TPMI table.

[0174] By the above operation 7), in the multi-layer DFT-s-OFDM, the precoding matrix and the number of layers to be applied to the scheduled DFT-s-OFDM PUSCH can be determined.

[0175] Operation 8) Notification of DMRS antenna port for multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below.

[0176] Operation 8-1) For multi-layer DFT-s-OFDM PUSCH, the DMRS configuration type of legacy NR may be reused. DMRS configuration type 1 may be supported for DFT-s-OFDM with a rank greater than 1.

[0177] Separate or different antenna port-specific tables may be supported or implemented for DFT-s-OFDM PUSCH with maxRank greater than 1. In each antenna port-specific table for DFT-s-OFDM, the number of DMRS CDM groups without data may be equal to the total number of DMRS CDM groups supported for the DMRS configuration type. For example, the number of DMRS CDM groups without data for DMRS configuration type 1 may be 2.

[0178] If a new antenna port table is introduced for DFT-s-OFDM with rank greater than 1, the new table may be used to interpret the antenna field included in the UL grant DCI scheduling the DFT-s-OFDM PUSCH. The field size for DFT-s-OFDM with rank greater than 1 may be equal to, smaller than, or larger than the field size for CP-OFDM with rank greater than 1.

[0179] Tables 12, 13 and 14 show examples of antenna port tables.

[0180]

[0181]

[0182]

[0183] Table 12 is an example for DFT-s-OFDM, dmrs-Type = 1, maxLength = 1, rank = 2. Table 13 is an example for DFT-s-OFDM, dmrs-Type = 1, maxLength = 1, rank = 3. Table 14 is an example for DFT-s-OFDM, dmrs-Type = 1, maxLength = 2, rank = 2.

[0184] 5 is a diagram illustrating an example of DMRS according to an embodiment of the present invention. As shown in FIG. 5, a subcarrier- or RB-level comb-structured DMRS transmission may be introduced for DFT-s-OFDM PUSCH.

[0185] The transmit comb parameter K_TC may be configured by the gNB, signaled, or defined in a specification. The comb parameter allows for flexible configuration of the DMRS density in the frequency domain. For example, a low DMRS density with a coarse comb is effective for environments that are not frequency selective channels.

[0186] Candidate values ​​for K_TC may be defined in the specifications. For example, candidate values ​​for K_TC may be 2, 4, 6, 8, 12, 16, 24, etc. K_TC may be determined based on the number of notified antenna ports. As in Example 1 shown in FIG. 5, K_TC may be the number of antenna ports. That is, one comb may occupy one antenna port. As in Example 2 shown in FIG. 5, K_TC may be M times the number of antenna ports. That is, one antenna port may be mapped to M combs. As in Example 3 shown in FIG. 5, K_TC may be a value obtained by dividing the number of antenna ports by N. That is, one comb may be mapped to N antenna ports.

[0187] The DMRS antenna port field signaling may be signaled based on the K_TC parameter and / or the DMRS symbol position parameter and / or the DMRS antenna port position within the antenna ports mapped by the comb.

[0188] Operation 8-1) For multi-layer DFT-s-OFDM PDSCH, the DMRS configuration type of legacy NR may be reused. DMRS configuration type 1 may be supported for DFT-s-OFDM with a rank greater than 1.

[0189] Separate or different antenna port-specific tables may be supported or implemented for DFT-s-OFDM PDSCHs with maxRank greater than 1. In each antenna port-specific table for DFT-s-OFDM, the number of DMRS CDM groups without data may be equal to the total number of DMRS CDM groups supported for the DMRS configuration type. For example, the number of DMRS CDM groups without data for DMRS configuration type 1 may be 2.

[0190] If a new antenna port table is introduced for DFT-s-OFDM with rank greater than 1, the new table may be used to interpret the antenna field included in the DL grant DCI scheduling the DFT-s-OFDM PDSCH. The field size for DFT-s-OFDM with rank greater than 1 may be equal to, smaller than, or larger than the field size for CP-OFDM with rank greater than 1.

[0191] Tables 15 and 16 show examples of antenna port tables.

[0192]

[0193]

[0194] Table 15 is an example for DFT-s-OFDM, dmrs-Type=1, maxLength=1. Table 16 is an example for DFT-s-OFDM, dmrs-Type=1, maxLength=2.

[0195] 5 is a diagram illustrating an example of DMRS in an embodiment of the present invention. As shown in FIG. 5, a subcarrier- or RB-level comb-structured DMRS transmission may be introduced for DFT-s-OFDM PDSCH.

[0196] The transmit comb parameter K_TC may be configured in the gNB, signaled, or defined in the specification.

[0197] Candidate values ​​for K_TC may be defined in the specifications. For example, candidate values ​​for K_TC may be 2, 4, 6, 8, 12, 16, etc. K_TC may be determined based on the number of notified antenna ports. As in Example 1 shown in FIG. 5, K_TC may be the number of antenna ports. That is, one comb may occupy one antenna port. As in Example 2 shown in FIG. 5, K_TC may be M times the number of antenna ports. That is, one antenna port may be mapped to M combs. As in Example 3 shown in FIG. 5, K_TC may be a value obtained by dividing the number of antenna ports by N. That is, one comb may be mapped to N antenna ports.

[0198] The DMRS antenna port field signaling may be signaled based on the K_TC parameter and / or the DMRS symbol position parameter and / or the DMRS antenna port position within the antenna ports mapped by the comb.

[0199] Operation 9) PTRS for multi-layer DFT-s-OFDM PUSCH / PDSCH will be described below.

[0200] Operation 9-1) The time and frequency domain resources of the PTRS for the DFT-s-OFDM PUSCH of rank greater than 1 may be determined as follows: 1) or 2).

[0201] 1) For DFT-s-OFDM PUSCH with rank greater than 1, legacy rules may be reused.

[0202] 2) A new, separate, or different table showing the relationship between PTRS group patterns and scheduled subband widths may be introduced or supported for DFT-s-OFDM PUSCH with a rank greater than 1. The number of PTRS groups and / or the number of samples in a PTRS group may depend on the number of layers, i.e., the rank.

[0203] For PTRS ports, the supported or configured maximum number of PTRS ports scheduled for DFT-s-OFDM PUSCHs of rank greater than 1 may be 1 or 2. The association of PTRS and DMRS antenna ports for DFT-s-OFDM PUSCHs of rank greater than 1 may reuse the legacy rules for CP-OFDM of rank greater than 1, or a new, separate, or different DMRS-PTRS antenna port mapping or association table may be introduced or supported.

[0204] Operation 9-2) The time and frequency domain resources of the PTRS for the DFT-s-OFDM PDSCH of rank greater than 1 may be determined as in 1) or 2) below.

[0205] 1) For DFT-s-OFDM PDSCHs of rank greater than 1, legacy rules may be reused.

[0206] 2) A new, separate, or different table showing the relationship between PTRS group patterns and scheduled subband widths may be introduced or supported for DFT-s-OFDM PDSCHs with ranks greater than 1. The number of PTRS groups and / or the number of samples in a PTRS group may depend on the number of layers, i.e., rank.

[0207] For PTRS ports, the supported or configured maximum number of PTRS ports scheduled for DFT-s-OFDM PDSCHs of rank greater than 1 may be 1 or 2. The association of PTRS and DMRS antenna ports for DFT-s-OFDM PDSCHs of rank greater than 1 may reuse the legacy rules for CP-OFDM of rank greater than 1, or a new, separate, or different DMRS-PTRS antenna port mapping or association table may be introduced or supported.

[0208] The UE capabilities listed below may be defined for each UE, each FR, each FC, etc., and reported from the UE to the base station 10.

[0209] Whether to support DFT-s-OFDM PUSCH with more than one layer Whether to support DFT-s-OFDM PDSCH with more than one layer The maximum number of layers supported for DFT-s-OFDM PUSCH The maximum number of layers supported for DFT-s-OFDM PDSCH Whether to support two-codeword transmission for DFT-s-OFDM PUSCH The maximum number of codewords supported for DFT-s-OFDM PUSCH Whether to support two-codeword transmission for DFT-s-OFDM PDSCH - The maximum number of codewords supported for DFT-s-OFDM PDSCH - Whether to support fully coherent, partially coherent, or non-coherent codebooks for more than one DFT-s-OFDM PUSCH - Whether to support fully coherent, partially coherent, or non-coherent codebooks for more than one DFT-s-OFDM PDSCH - Whether to support comb-based DMRS for DFT-s-OFDM PUSCH or PDSCH - Whether to support PTRS2 ports for DFT-s-OFDM PUSCH - The maximum number of PTRS ports supported for DFT-s-OFDM PUSCH

[0210] According to the above embodiment, it is possible to transmit and receive a multi-layer DFT-s-OFDM PUSCH or a multi-layer DFT-s-OFDM PDSCH.

[0211] That is, the waveform and transmission method can be controlled in a wireless communication system.

[0212] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described above will be described. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions of the embodiments.

[0213] <Base Station 10> Figure 6 is a diagram showing an example of the functional configuration of the base station 10 according to an embodiment of the present invention. As shown in Figure 6, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Figure 6 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations according to the embodiment of the present invention.

[0214] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The transmitter 110 also transmits inter-network node messages to other network nodes. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of higher layers from the received signals. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, etc. to the terminal 20. The receiver 120 also receives inter-network node messages from other network nodes.

[0215] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information includes, for example, information relating to the settings of waveforms and transmission methods.

[0216] As described in the embodiments, the control unit 140 controls the setting of the waveform and transmission method. The control unit 140 also executes scheduling. The functional unit in the control unit 140 related to signal transmission may be included in the transmitting unit 110, and the functional unit in the control unit 140 related to signal reception may be included in the receiving unit 120.

[0217] <Terminal 20> Fig. 7 is a diagram showing an example of the functional configuration of terminal 20 in an embodiment of the present invention. As shown in Fig. 7, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 7 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention.

[0218] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 wirelessly receives various signals and acquires higher layer signals from the received physical layer signals. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, and the like transmitted from the base station 10. For example, the transmitter 210 transmits a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to another terminal 20 as D2D communication, and the receiver 220 receives the PSCCH, PSSCH, PSDCH, or PSBCH, and the like, from the other terminal 20.

[0219] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores setting information that is set in advance. The setting information includes, for example, information related to the setting of the waveform and transmission method.

[0220] As described in the embodiments, the control unit 240 controls the setting of the waveform and transmission method. The functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0221] (Hardware Configuration) The block diagrams (FIGS. 6 and 7) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0222] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0223] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 8 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0224] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0225] Each function in the base station 10 and the terminal 20 is realized by loading specified software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0226] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0227] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 6 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 7 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0228] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0229] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0230] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0231] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0232] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0233] Furthermore, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0234] Fig. 9 shows an example configuration of a vehicle 2001. As shown in Fig. 9, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0235] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0236] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0237] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a front or rear wheel rotation speed signal obtained by a rotation speed sensor 2022, a front or rear wheel air pressure signal obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0238] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information acquired from external devices via the communication module 2013 or the like to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001. The information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that output information to the outside.

[0239] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0240] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0241] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0242] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0243] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0244] (Summary of the embodiment) As described above, according to the embodiment of the present invention, there is provided a terminal including: a control unit that determines the number of layers and the number of codewords to be applied to a DFT-s-OFDM (Discrete fourier transform-spread-Orthogonal Frequency Division Multiplexing) PUSCH (Physical Uplink Shared Channel), maps each codeword to multiple layers, performs precoding as necessary, sets a DMRS (Demodulation reference signal) and a PTRS (Phase tracking reference signal), and generates the DFT-s-OFDM PUSCH signal; and a transmission unit that transmits the DFT-s-OFDM PUSCH signal.

[0245] The above configuration enables transmission and reception of a multi-layer DFT-s-OFDM PUSCH or a multi-layer DFT-s-OFDM PDSCH, i.e., it is possible to control waveforms and transmission methods in a wireless communication system.

[0246] The maximum number of codewords may be equal to the maximum number of codewords for CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing). With this configuration, it is possible to transmit and receive a multi-layer DFT-s-OFDM PUSCH or a multi-layer DFT-s-OFDM PDSCH.

[0247] The controller may map each codeword to multiple layers based on the maximum number of layers per codeword. This configuration enables transmission and reception of a multi-layer DFT-s-OFDM PUSCH or a multi-layer DFT-s-OFDM PDSCH.

[0248] The control unit may set the number of groups of PTRS based on the number of layers. With this configuration, it is possible to transmit and receive a multi-layer DFT-s-OFDM PUSCH or a multi-layer DFT-s-OFDM PDSCH.

[0249] The control unit may use a precoder having a smaller number of precoding matrices than that for the CP-OFDM PUSCH. With this configuration, it is possible to transmit and receive a multi-layer DFT-s-OFDM PUSCH or a multi-layer DFT-s-OFDM PDSCH.

[0250] Furthermore, according to an embodiment of the present invention, there is provided a communication method in which a terminal determines the number of layers and the number of codewords to be applied to a DFT-s-OFDM (Discrete Fourier transform-spread-Orthogonal Frequency Division Multiplexing) PUSCH (Physical Uplink Shared Channel), maps each codeword to multiple layers, performs precoding as necessary, sets a demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS), and generates the DFT-s-OFDM PUSCH signal.

[0251] The above configuration enables transmission and reception of a multi-layer DFT-s-OFDM PUSCH or a multi-layer DFT-s-OFDM PDSCH, i.e., it is possible to control waveforms and transmission methods in a wireless communication system.

[0252] (Supplementary Notes on the Embodiments) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; matters described in two or more items may be used in combination as needed, and matters described in one item may apply to matters described in another item (as long as there is no contradiction). Boundaries between functional units or processing units in functional block diagrams do not necessarily correspond to boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0253] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0254] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems enhanced based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0255] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0256] In this specification, a specific operation described as being performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0257] The information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0258] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be transmitted to another device.

[0259] In the present disclosure, the determination may be made by a value represented by one bit (0 or 1), by a Boolean value (true or false), or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0260] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0261] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0262] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0263] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0264] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0265] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0266] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0267] In the present disclosure, terms such as "base station (BS)," "radio base station," "base station device," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0268] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage.

[0269] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0270] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0271] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0272] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be a mobile object that moves autonomously based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0273] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0274] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0275] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0276] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0277] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0278] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0279] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0280] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0281] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0282] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0283] Numerology may be communication parameters that apply to the transmission and / or reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, etc.

[0284] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0285] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0286] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0287] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0288] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0289] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0290] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0291] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0292] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0293] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0294] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0295] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0296] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0297] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0298] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0299] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0300] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.

[0301] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0302] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0303] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0304] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0305] REFERENCE SIGNS LIST 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Controller 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Controller 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A terminal having a control unit that determines the number of layers and the number of codewords applicable to DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) PUSCH (Physical Uplink Shared Channel), maps each codeword to a plurality of layers, performs precoding as necessary, sets DMRS (Demodulation reference signal) and PTRS (Phase tracking reference signal), and generates a signal of the DFT-s-OFDM PUSCH; and a transmission unit that transmits the signal of the DFT-s-OFDM PUSCH.

2. The terminal according to claim 1, wherein the maximum value of the number of codewords is equal to the maximum value of the number of codewords for CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing).

3. The terminal according to claim 1, wherein the control unit maps each codeword to a plurality of layers based on the maximum number of layers per codeword.

4. The terminal according to claim 1, wherein the control unit sets comb-shaped DMRS in the frequency domain based on the number of antenna ports.

5. The terminal according to claim 1, wherein the control unit sets the number of groups of PTRS based on the number of layers.

6. A communication method in which a terminal executes a procedure of determining the number of layers and the number of codewords applicable to DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) PUSCH (Physical Uplink Shared Channel), mapping each codeword to a plurality of layers, performing precoding as necessary, setting DMRS (Demodulation reference signal) and PTRS (Phase tracking reference signal), and generating a signal of the DFT-s-OFDM PUSCH; and a procedure of transmitting the signal of the DFT-s-OFDM PUSCH.

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