Terminal and communication method

Abstract

This terminal includes: a control unit that inserts Phase Tracking Reference Signals (PT-RSs), to which at least one of time division multiplexing and code division multiplexing has been applied, into a signal to which Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) is to be applied; and a transmission unit for transmitting each of the multiplexed PT-RSs at each of a plurality of ports, respectively.

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 38.211 V17.6.0 (2023-09)3GPP TS 38.214 V17.7.0 (2023-09)

[0006] In NR, CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) supports two-port PT-RS (Phase Tracking Reference Signal), and DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) supports one-port PT-RS. In next-generation wireless communication systems, extensions of DFT-s-OFDM to be applied to DL are being considered to improve spectral efficiency and / or reduce PAPR (Peak to Average Power Ratio). Therefore, in order to support multi-TRP (Transmission and Reception Point) transmission in DL (Downlink) and multi-panel transmission in UL (Uplink), a multi-port PT-RS is required.

[0007] The present invention has been made in view of the above points, and has an object to support a multi-port PT-RS (Phase Tracking Reference Signal) in a wireless communication system.

[0008] According to the disclosed technology, a terminal is provided that has a control unit that inserts a PT-RS (Phase Tracking Reference Signal) that applies at least one of time division multiplexing and code division multiplexing into a signal to which DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) is applied, and a transmission unit that transmits each of the multiplexed PT-RS from each of a plurality of ports.

[0009] According to the disclosed technology, it is possible to support multi-port phase tracking reference signals (PT-RSs) in a wireless communication system.

[0010] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system according to an embodiment of the present invention. FIG. 1 is a diagram illustrating an example of a transmitter. FIG. 2 is a diagram illustrating an example of a PT-RS. FIG. 3 is a diagram illustrating an example of a PT-RS according to an embodiment of the present invention. FIG. 4 is a diagram illustrating an example of a PT-RS according to an embodiment of the present invention. FIG. 5 is a diagram illustrating an example of a PT-RS according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of a PT-RS according to an embodiment of the present invention. FIG. 7 is a diagram illustrating an example of a PT-RS according to an embodiment of the present invention. FIG. 8 is a diagram illustrating an example of a PT-RS according to an embodiment of the present invention. FIG. 9 is a diagram illustrating an example of a PT-RS according to an embodiment of the present invention. Fig. 1 is a diagram showing an example of the functional configuration of a base station 10 according to an embodiment of the present invention. Fig. 2 is a diagram showing an example of the functional configuration of a terminal 20 according to an embodiment of the present invention. Fig. 3 is a diagram showing an example of the hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. Fig. 4 is a diagram showing an example of the configuration of a vehicle 2001 according to 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] 2 is a diagram for explaining an example of a transmitter. FIG. 2 is a block diagram of a transmitter in 5G NR (see Non-Patent Document 3). As shown in FIG. 2, scrambling, modulation, layer mapping, transform precoding, antenna port mapping, mapping to virtual resource blocks, and mapping to physical resource blocks are executed in this order. Note that the input vector x and output vector y of transform precoding have the same dimension.

[0023] The PT-RS (Phase Tracking Reference Signal) is used to track the phase of oscillators in the receiver and transmitter. The PT-RS suppresses phase noise and common phase error, which is particularly important in high frequency bands such as millimeter wave bands and sub-tera Hz bands.

[0024] The number of PT-RS ports is related to the number of independent noise sources. In DL transmission, the phase noise between different TRPs (Transmission and Reception Points) is independent from each other, so multiple PT-RS ports are mainly used for multi-TRP transmission. For example, NR Release 15 supports up to two-port PT-RS.

[0025] For UL transmission, one PT-RS port must be configured for each panel, so multiple PT-RS ports are primarily used for multi-panel transmission. For example, NR Release 15 supports up to two-port PT-RS for CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing).

[0026] In NR, CP-OFDM supports two-port PT-RS for both DL and UL, and DFT-s-OFDM (Discrete Fourier transform - spread - Orthogonal Frequency Division Multiplexing) supports one-port PT-RS for UL.

[0027] For PT-RSs applied to UL DFT-s-OFDM in NR, the sequence is a Gold sequence modulated with π / 2-BPSK (Binary Phase Shift Keying). The mapping method is inserted before DFT precoding at predefined positions for different numbers of PT-RS groups and samples per PT-RS group.

[0028] FIG. 3 is a diagram for explaining an example (1) of PT-RS. FIG. 3 shows an example in which PT-RSs are mapped to one OFDM symbol. The mapping is defined in the specifications by the number of groups and the number of samples. The supported combinations of {number of groups, number of samples} may be {2, 2}, {2, 4}, {4, 2}, {4, 4}, and {8, 4}. The number of samples indicates the number of samples per group. Note that all PT-RSs included in one OFDM symbol before transform precoding may be referred to as a "PT-RS cluster."

[0029] Table 1 shows the mapping of PT-RS to OFDM symbols (see Non-Patent Document 3).

[0030]

[0031] As shown in Table 1, the OFDM symbol in which the PT-RS is inserted is determined by the number of PT-RS groups and the number of samples per group.

[0032] Table 2 shows the association between the scheduled bandwidth, the number of PT-RS groups, and the number of samples per group (see Non-Patent Document 4).

[0033]

[0034] As shown in Table 2, the number of PT-RS groups and the number of samples per group are determined based on the scheduled bandwidth.

[0035] FIG. 4 is a diagram for explaining an example (2) of PT-RS. As shown in FIG. 4, the parameter L ＰＴ－ＲＳ A PT-RS is inserted for every OFDM symbol number.

[0036] In NR, two-port PT-RS is supported for CP-OFDM and one-port PT-RS is supported for DFT-s-OFDM. For 5G-A and 6G, DFT-s-OFDM may be extended. For example, multiple layers of full, partial, and non-coherent transmission may be supported to improve the spectral efficiency (SE) of the UL and / or reduce the peak-average-power-reproduction ratio (PAPR) of DL transmissions.

[0037] DFT-s-OFDM and extended DFT-s-OFDM are candidate waveforms with the advantage of low PAPR to support 5G-A or 6G applications. To support multi-TRP transmission in DL and multi-panel transmission in UL, multi-port PT-RS are required for DFT-s-OFDM and extended DFT-s-OFDM in UL and / or DL.

[0038] Regarding the design of multi-port PT-RS for DFT-s-OFDM and extended DFT-s-OFDM, the configuration of legacy PT-RS for DFT-s-OFDM does not support multiple ports, and in resource-limited situations, it is desirable to configure more orthogonal ports to increase multiplexing capacity.

[0039] All the operations below are applicable to DFT-s-OFDM and extended DFT-s-OFDM.

[0040] Operation 1-1) Time division multiplexing (TDM) method applicable to multi-port PT-RS supported for DFT-s-OFDM Operation 1-1-1) Time domain density L ＰＴ－ＲＳWhen is 2 or more up to the number of PT-RS ports, support of PT-RS ports at the OFDM symbol level by TDM. Operation 1-1-2) Time domain density L taking into account multiplexing between PT-RS groups within an OFDM symbol before transform precoding ＰＴ－ＲＳ When is between 1 and 2, support for group-level PT-RS ports by TDM. Operation 1-2) Combination of Operation 1-1-1) and Operation 1-1-2). Operation 2) Support for multi-port PT-RS based on OCC (Orthogonal Cover Code) for DFT-s-OFDM. Operation 3) Support for multi-port PT-RS based on orthogonal sequences for DFT-s-OFDM. Operation 3-1) Support for multi-port PT-RS for DFT-s-OFDM based on legacy PT-RS generation method. Operation 3-2) Support for multi-port PT-RS for DFT-s-OFDM based on low-PAPR sequence generation method.

[0041] The above operations may be combined, and UE capabilities related to the above operations may be defined.

[0042] Hereinafter, operation 1-1) Time division multiplexing (TDM) method applicable to multi-port PT-RS supported for DFT-s-OFDM will be described.

[0043] The PT-RS for DFT-s-OFDM in the UL in the NR is inserted before DFT precoding, and the time density L ＰＴ－ＲＳ is set by the upper layer parameter timeDensityTransformPrecoding. ＰＴ－ＲＳ = 2 can be set. Otherwise, the UE ＰＴ－ＲＳ Assume that L = 1. ＰＴ－ＲＳ When L = 2, the PT-RS is inserted every 2 OFDM symbols, and ＰＴ－ＲＳ = 1, a PT-RS is inserted in every OFDM symbol. Because of the insertion of PT-RS in the time domain, multi-port PT-RS may be supported by TDM in an intuitive way.

[0044] Hereafter, operation 1-1-1) Density L in the time domain ＰＴ－ＲＳ When is 2 or more up to the number of PT-RS ports, support of PT-RS ports at the OFDM symbol level by TDM will be described.

[0045] The PT-RS port with portIndex=1 is generated by the legacy mapping method. Other PT-RS ports with portIndex>1 are generated by cyclically offsetting the PT-RS port with portIndex=1.

[0046] The offset value is, for example, the parameter defaultsymbolLevel ＰＴ－ＲＳ The default setting is offset=defaultsymbolLevel. ＰＴ－ＲＳ For the n-th PT-RS port, an additional offset (n-1)offset may be added to the time index of the PT-RS (see Non-Patent Document 3). The time index of the PT-RS is (l ｒｅｆ +iL ＰＴ－ＲＳ +(n-1)offset) mod (maxIndexPDSCH), for PUSCH (l ｒｅｆ +iL ＰＴ－ＲＳ +(n-1)offset) mod (maxIndexPUSCH). The parameters maxIndexPDSCH and maxIndexPUSCH are the maximum indices of PDSCH and PUSCH. If the index of the PT-RS after the cyclic offset is greater than the index of the initially generated PT-RS, the PT-RS may not be inserted.

[0047] The cyclic offset is an operation for a portion of the PT-RS index that exceeds the PDSCH or PUSCH based on operation 1-1-1) after the offset. Based on the cyclic offset, the PT-RS is moved from outside the PDSCH or PUSCH allocation to the beginning of the PDSCH or PUSCH for the PT-RS port n>1. This allows the PT-RS to be arranged even near the beginning of the PDSCH or PUSCH after the cyclic offset is applied, thereby increasing the PT-RS density and improving the phase noise estimation performance.

[0048] When a PT-RS with portIndex>1 generated by offsetting a PT-RS with portIndex=1 is inserted outside the PDSCH or PUSCH, the insertion may not be performed. ＰＴ－ＲＳ may have a default value of 1.

[0049] For PT-RS with port n>1, if the OFDM symbol of the PT-RS after the offset overlaps with the symbol used for the DMRS, two options may be defined for the offset.

[0050] Option 1-1) For a PT-RS of port n>1, if the OFDM symbol of the PT-RS after offset overlaps with the symbol used for the DMRS, the overlapping symbol may be skipped.

[0051] Option 1-1-1) Index ｒｅｆ +iL ＰＴ－ＲＳ , and the PT-RS of the next port 1 may be offset to obtain the PT-RS of port n>1.

[0052] Port 1 index l ｒｅｆ +iL ＰＴ－ＲＳ When offsetting the PT-RS of port n to overlap with the DMRS, skip the PT-RS of port n>1 and set the index l of port 1. ｒｅｆ +(i+1)L ＰＴ－ＲＳ The procedure may proceed to offset the PT-RS.

[0053] When the PT-RS of port 1 is generated by the legacy mapping method, the index of each symbol where the PT-RS is located is ｒｅｆ +iL ＰＴ－ＲＳ Each index l of port 1 ｒｅｆ +iL ＰＴ－ＲＳ The PT-RS of port n>1 is offset to obtain the PT-RS of port n>1.

[0054] Port 1 index l ｒｅｆ +iL ＰＴ－ＲＳ When offsetting the PT-RS of port n to overlap with the DMRS, skip the PT-RS of port n>1 and set the index l of port 1. ｒｅｆ +(i+1)L ＰＴ－ＲＳ Offset the PT-RS.

[0055] For example, the time density L ＰＴ－ＲＳ If ≠ 2 and two-port PT-RSs are supported, the PT-RSs are inserted into OFDM symbols within one slot as {PT-RS1, PT-RS2, PT-RS1, PT-RS2, ...} by default. When the PT-RS symbols for each offset overlap with the DMRS symbols, in the case of single-symbol DMRS, the PT-RSs inserted into OFDM symbols within one slot may be {PT-RS1, PT-RS2, PT-RS1, DMRS, PT-RS1, PT-RS2, PT-RS1, ...}, and in the case of double-symbol DMRS, the PT-RSs inserted into OFDM symbols within one slot may be {PT-RS1, PT-RS2, PT-RS1, DMRS, DMRS, PT-RS1, PT-RS2, ...}.

[0056] Option 1-1-2) For PT-RSs of port n>1, overlapping DMRSs may be skipped and replaced with offset PT-RSs.

[0057] Option 1-2) An additional offset may be added to the PT-RS of port 1 to avoid overlap of the DMRS with the PT-RS of port n>1 and / or the PT-RS of port 1.

[0058] The number of PT-RS ports is L ＰＴ－ＲＳ If the parameter defaultsymbolLevel is less than ＰＴ－ＲＳ may be greater than 1. The parameter defaultsymbolLevel ＰＴ－ＲＳ The value of may be defined in the specification, for example, different values ​​may be used depending on the number of ports of the PT-RS and L ＰＴ－ＲＳ may be defined for different combinations of these, and may be configured or signaled by the BS.

[0059] To support scenarios with different requirements for phase noise estimation, phase noise compensation capability, and spectral efficiency, two optional orthogonal and quasi-orthogonal PT-RS ports may be defined.

[0060] Option 2-1) Orthogonal PT-RS ports may be defined based on orthogonal resource allocation in the time domain between the PT-RS of one PT-RS port and other PT-RS ports associated with the PDSCH or PUSCH.

[0061] Resources within one OFDM symbol before DFT precoding for one PT-RS port may not be allocated to data transmissions associated with other PT-RS ports, which prevents interference between the PT-RS and data associated with different PT-RS ports and improves phase noise estimation, phase noise compensation capability, and spectral efficiency.

[0062] Option 2-2) Pseudo-orthogonal PT-RS ports may be defined. The same resources in the time domain may be allocated to the PT-RS of one port and the PDSCH or PUSCH associated with another PT-RS port. Systems using multiple TRPs and / or multiple panels typically use beamforming, which can reduce interference between PT-RS ports. Resources within one OFDM symbol before DFT precoding for the PT-RS of one port may be allocated to data transmissions associated with other PT-RS ports. Since the overhead is similar to that of a single-port PT-RS, spectral efficiency is improved.

[0063] Whether to use option 2-1) or option 2-2) may be determined based on UE capabilities or RRC settings.

[0064] New parameters maxNrofPorts and / or emptyAllocation may be defined for the PT-RS for DFT-s-OFDM. These parameters may be configured or signaled in a physical layer parameter (e.g., DCI) or in a higher layer parameter (e.g., RRC signaling, MAC-CE).

[0065] The parameter maxNrofPorts indicates the number of ports of the PT-RS for DFT-s-OFDM. The actual number of ports of the PT-RS may be equal to or less than maxNrofPorts.

[0066] The parameter emptyAllocation indicates whether the resources of the PT-RS of one port overlap with the PDSCH or PUSCH resources associated with other PT-RS ports. For example, if emptyAllocation = 0, the orthogonal resources of option 2-1) are used, and if emptyAllocation = 1, the non-orthogonal resources of option 2-2) may be used. The default value of emptyAllocation may be 0.

[0067] An example of the procedure for determining the OFDM index for the above option 1-1-1) will be described. The set l of time indexes for the first port of the PT-RS is defined relative to the beginning of the PDSCH or PUSCH allocation. ＰＴ－ＲＳ (≧2) may be given by higher layer parameters (eg, RRC signaling, MAC-CE) or physical layer parameters (eg, DCI or UCI).

[0068] Step 1: i=0, l ｒｅｆ =0, portIndex=1,2,3,..., maxNrofPorts, defaultsymbolLevel ＰＴ－ＲＳ = 1 (default)

[0069] Step 2: For the PT-RS of port 1, perform the following process: [1] Interval max(l ｒｅｆ +(i-1)L ＰＴ－ＲＳ +1,l ｒｅｆ ), ..., l ｒｅｆ +iL ＰＴ－ＲＳ If any symbol in overlaps with a symbol used for DMRS (see section 6.4.1.1.3 of Non-Patent Document 3), the following process is performed: Set i=1; For single-symbol DMRS, ｒｅｆ Set t to the symbol index of the DM-RS symbol, and l for double-symbol DMRS. ｒｅｆ Set [1] to the symbol index of the second symbol of the DM-RS. ｒｅｆ +iL ＰＴ－ＲＳ Repeat as long as is within a PDSCH or PUSCH allocation. [2] ｒｅｆ +iL ＰＴ－ＲＳ to the set of time indexes of the PT-RS of port 1. Step 3: For the PT-RS of port n (n>1), with PortIndex=2, 3, ..., maxNrofPorts, perform the following process: [1] offset and defaultsymbolLevel ＰＴ－ＲＳ (offset=defaultsymbolLevel ＰＴ－ＲＳ Based on the index of the PT-RS of port 1, ｒｅｆ +iL ＰＴ－ＲＳ Define an index that is a cyclic offset of [2] the interval max(l ｒｅｆ +(i-1)L ＰＴ－ＲＳ +1,l ｒｅｆ )+(portIndex-1)offset,...,l ｒｅｆ +iL ＰＴ－ＲＳ +(portIndex-1) offset, if any symbol in the offset overlaps with a symbol used for DMRS (see section 6.4.1.1.3 of 3GPP TS 2013-01-10, 2013-01-10), ｒｅｆ +iL ＰＴ－ＲＳ [3] For PDSCH, (l ｒｅｆ +iL ＰＴ－ＲＳ+(n-1)offset) mod (maxIndexPDSCH) is added to the set of time indexes of the PT-RS of the nth port. ｒｅｆ +iL ＰＴ－ＲＳ Step 4: Add i by 1. Step 5: Add (maxIndexPDSCH+(n-1)offset) mod (maxIndexPUSCH) to the set of time indexes of the PT-RS of the nth port, where maxIndexPDSCH and maxIndexPUSCH are the maximum indices of PDSCH and PUSCH. ｒｅｆ +iL ＰＴ－ＲＳ Repeat from step 2 as long as . is in the PDSCH or PUSCH.

[0070] An example of the procedure for determining the OFDM index for the above option 1-1-1) will be described. The set l of time indexes for the first port of the PT-RS is defined relative to the beginning of the PDSCH or PUSCH allocation. ＰＴ－ＲＳ (=2) may be given by higher layer parameters (eg, RRC signaling, MAC-CE) or physical layer parameters (eg, DCI or UCI).

[0071] Step 1: i=0, l ｒｅｆ =0, portIndex=1,2,3,..., maxNrofPorts, defaultsymbolLevel ＰＴ－ＲＳ = 1 (default)

[0072] Step 2: For the PT-RS of port 1, perform the following process: [1] Interval max(l ｒｅｆ +(i-1)L ＰＴ－ＲＳ +1,l ｒｅｆ ), ..., l ｒｅｆ +iL ＰＴ－ＲＳ If any symbol in overlaps with a symbol used for DMRS (see section 6.4.1.1.3 of Non-Patent Document 3), the following process is performed: Set i=1; For single-symbol DMRS, ｒｅｆ Set t to the symbol index of the DM-RS symbol, and l for double-symbol DMRS. ｒｅｆSet [1] to the symbol index of the second symbol of the DM-RS. ｒｅｆ +iL ＰＴ－ＲＳ Repeat as long as is within a PDSCH or PUSCH allocation. [2] ｒｅｆ +iL ＰＴ－ＲＳ to the set of time indexes of the PT-RS of port 1. Step 3: With PortIndex=2, perform the following process for the PT-RS of port n (n=2): [1] offset and defaultsymbolLevel ＰＴ－ＲＳ (offset=defaultsymbolLevel ＰＴ－ＲＳ Based on the index of the PT-RS of port 1, ｒｅｆ +iL ＰＴ－ＲＳ Define an index that is a cyclic offset of [2] the interval max(l ｒｅｆ +(i-1)L ＰＴ－ＲＳ +1,l ｒｅｆ )+(portIndex-1)offset,...,l ｒｅｆ +iL ＰＴ－ＲＳ +(portIndex-1) offset, if any symbol in the offset overlaps with a symbol used for DMRS (see section 6.4.1.1.3 of 3GPP TS 2013-01-10, 2013-01-10), ｒｅｆ +iL ＰＴ－ＲＳ [3] For PDSCH, (l ｒｅｆ +iL ＰＴ－ＲＳ +(n-1)offset) mod (maxIndexPDSCH) is added to the set of time indexes of the PT-RS of the nth port. ｒｅｆ +iL ＰＴ－ＲＳ Step 4: Add i by 1. Step 5: Add (maxIndexPDSCH+(n-1)offset) mod (maxIndexPUSCH) to the set of time indexes of the PT-RS of the nth port, where maxIndexPDSCH and maxIndexPUSCH are the maximum indices of PDSCH and PUSCH. ｒｅｆ +iL ＰＴ－ＲＳ Repeat from step 2 as long as . is in the PDSCH or PUSCH.

[0073] 5 is a diagram for explaining an example (1) of PT-RS in an embodiment of the present invention. As shown in FIG. 5, the NR mapping method may be used to obtain the PT-RS of port 1, and the PT-RS of port 2 may be determined by shifting the PT-RS of port 1. FIG. 5 shows the L ＰＴ－ＲＳ =2, offset=defaultsymbolLevel ＰＴ－ＲＳ (default value defaultsymbolLevel ＰＴ－ＲＳ 5, the PT-RS of port 2 is shifted from the PT-RS of port 1 due to offset=1.

[0074] FIG. 6 is a diagram for explaining an example (2) of a PT-RS in an embodiment of the present invention. ＰＴ－ＲＳ =2, offset=defaultsymbolLevel ＰＴ－ＲＳ = 1. Option 2-1) is an example of an orthogonal PT-RS port (emptyAllocation = 0). To reduce interference at the same time position as the PT-RS of port 1, the samples associated in the time domain of port 2 may be set to empty (zero). Option 2-2) is an example of a quasi-orthogonal PT-RS port (emptyAllocation = 1). Interference at the same time position as the PT-RS of port 1 may be tolerated, and PDSCH or PUSCH may be placed in the samples associated in the time domain of port 2.

[0075] FIG. 7 is a diagram for explaining an example (3) of a PT-RS in an embodiment of the present invention. ＰＴ－ＲＳ =2, offset=defaultsymbolLevel ＰＴ－ＲＳOption 1-1-1 is an example where offset = 1, and shows an example where the PT-RS of port 2 that overlaps with the DMRS is skipped. Option 1-1-2 is an example where offset = 1, and shows an example where the DMRS that overlaps with the PT-RS of port 2 is skipped. Option 1-2 is an example where offset = 3, and shows an example where the PT-RS is offset and an appropriate offset value is set to avoid overlap between the port 1 DMRS and the port 2 PT-RS.

[0076] FIG. 8 is a diagram for explaining an example (4) of a PT-RS in an embodiment of the present invention. ＰＴ－ＲＳ =2, offset=defaultsymbolLevel ＰＴ－ＲＳ Example 1 is an example where offset = 1, and the PT-RS of port 2 that overlaps with DMRS is skipped. Example 2 is an example where offset = 1, and the PT-RS of port 1 that overlaps with DMRS is skipped. Example 3 is an example where offset = 1, and the PT-RS of port 1 that overlaps with DMRS is skipped. Example 4 is an example where offset = 1, and the PT-RS of port 2 that overlaps with DMRS is skipped.

[0077] Hereinafter, operation 1-1-2) Time domain density L taking into account multiplexing between PT-RS groups in an OFDM symbol before transform precoding ＰＴ－ＲＳ When is between 1 and 2, support for group-level PT-RS ports is described.

[0078] The PT-RS for UL DFT-s-OFDM in NR is inserted before DFT precoding, and the sample level density is set by the upper layer parameter sampleDensity, which indicates the set of bandwidth thresholds and the number of PT-RS groups N ｇｒｏｕｐ ＰＴ－ＲＳ and sample number PT-RS ｓａｍｐｌｅ ｇｒｏｕｐIn NR, five settings of the sample density of the PT-RS are supported: [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] is selected from {[2,2], [2,4], [4,2], [4,4], [8,4]}. Based on the mapping formula, the PT-RS groups are inserted symmetrically within the symbol.

[0079] To realize multiple PT-RS ports by TDM, sample-level orthogonality may be considered in addition to the OFDM symbol-level orthogonality in operation 1-1-1. The group pattern may be adjusted or enhanced according to the requirements of multiple PT-RS ports. For example, considering overhead limitations, [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ]=[8,2] may also be supported.

[0080] Option 1) 2N ｇｒｏｕｐ ＰＴ－ＲＳ The PT-RS of the group may be generated to support two orthogonal ports. ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] and may be used to signal a symmetrical arrangement for two ports.

[0081] [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ When [N] is {[2,2], [2,4], [4,4]}, the formula for calculating the index of the PT-RS sample (see Non-Patent Document 3) may be used to support a two-port PT-RS. ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] is {[4,2],[8,4]}, a new formula may be used to calculate the index of the PT-RS sample.

[0082] [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅｇｒｏｕｐ ] is {[2,2], [2,4], [4,4]}, then the PT-RS sample [2N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ], the PT-RS samples [2N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] may be calculated.

[0083] For example, the formula for NR for calculating the index of a PT-RS of one port with parameters [4,2], [4,4], and [8,4] is [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] may be used to generate the index of each two-port PT-RS sample, which is {[2,2], [2,4], [4,4]}.

[0084] [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] is {[4,2],[8,4]}, then [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ A formula for calculating the index of a two-port PT-RS sample with parameters [4, 2] and [8, 4] may be newly defined. In order to generate the index of a two-port PT-RS sample with parameters [4, 2] and [8, 4], a formula for calculating the index of a one-port PT-RS sample with parameters [8, 2] and [16, 4] is required. However, this parameter is not supported in NR.

[0085] In principle, all PT-RS groups within one symbol must be symmetrically arranged to ensure the performance of phase noise estimation and compensation. ｇｒｏｕｐ ＰＴ－ＲＳ is notified, the index i (i=0, 1, 2, . . . , N ｇｒｏｕｐ ＰＴ－ＲＳ -1) PT-RS group and index N ｇｒｏｕｐＰＴ－ＲＳ -1-i are symmetric with respect to the symbol center.

[0086] An index m of the PT-RS samples in the OFDM symbol before transform precoding may be given for each PTRS group based on the values ​​s and k. To support up to two-port PT-RS, the calculation of m may be extended and a new set of s, k, and n may be introduced as shown in Table 3.

[0087]

[0088] The index m of all PT-RSs in one symbol of port 1 and port 2 may be generated by default based on the mapping method in Table 3. The candidate index m of two ports is calculated by one formula, which may be related to s, k, and / or n.

[0089] For example, N ｇｒｏｕｐ ＰＴ－ＲＳ = 2, N ｓａｍｐｌｅ ｇｒｏｕｐ = 2, the indices of the PT-RS of port 1 and the PT-RS of port 2 are both expressed by the formula floor(sM ｓｃ ＰＵＳＣＨ / 8)+k-1. The PT-RS of port 1 is calculated with s=1, 7 and k=0, 1, and the PT-RS of port 2 is calculated with s=3, 5 and k=0, 1.

[0090] For each PT-RS port, the values ​​of s, k and / or n may be predefined in the specification and / or may be configured or signaled via higher layer parameters (e.g., RRC signaling, MAC-CE) or physical layer parameters (e.g., DCI or UCI).

[0091] In addition, M ｓｃ ＰＵＳＣＨ is the number of subcarriers for PUSCH, and in the case of PDSCH, the number of PDSCH carriers M ｓｃ ＰＤＳＣＨ s is the group index of the location candidate of the PT-RS.

[0092] Option 2) N ｓａｍｐｌｅｇｒｏｕｐ For each value of N (e.g., 2 or 4), one common formula applies to all N ｇｒｏｕｐ ＰＴ－ＲＳ may be introduced to generate a candidate index m for the two-port PT-RS. ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] may be determined by the common formula and parameters s, k and n.

[0093] Feature 1) The common formula is max(N ｇｒｏｕｐ ＰＴ－ＲＳ ), s, k, n. max(N ｇｒｏｕｐ ＰＴ－ＲＳ ) is N ｇｒｏｕｐ ＰＴ－ＲＳ For example, N ｇｒｏｕｐ ＰＴ－ＲＳ When = 2, the common formula is floor(sM ｓｃ ＰＵＳＣＨ / (4 max (N ｇｒｏｕｐ ＰＴ－ＲＳ )))+n+k. For example, N ｇｒｏｕｐ ＰＴ－ＲＳ = 4, the common formula is floor(sM ｓｃ ＰＵＳＣＨ / (2 max (N ｇｒｏｕｐ ＰＴ－ＲＳ )))+n+k.

[0094] max (N ｇｒｏｕｐ ＰＴ－ＲＳ The value of ) may be predefined in the specification and / or may be configured or signaled via higher layer parameters (e.g., RRC signaling, MAC-CE) or physical layer parameters (e.g., DCI or UCI).

[0095] Feature 2) The values ​​of s, k, and n are [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] and the port index of the PT-RS. ｇｒｏｕｐ ＰＴ－ＲＳFor values ​​of , the value of s may be predefined in the specification and / or may be configured or signaled via higher layer parameters (e.g., RRC signaling, MAC-CE) or physical layer parameters (e.g., DCI or UCI).

[0096] Option 2-1) A value of s for a 1-port PT-RS that achieves symmetrical placement of PT-RS groups may be specified. ｇｒｏｕｐ ＰＴ－ＲＳ is notified, the index i (i=0, 1, 2, . . . , N ｇｒｏｕｐ ＰＴ－ＲＳ -1) PT-RS group and index N ｇｒｏｕｐ ＰＴ－ＲＳ -1-i are symmetric with respect to the symbol center.

[0097] Option 2-2) A value of s for a one-port PT-RS may be specified to achieve asymmetric placement of PT-RS groups. In the asymmetric placement, the index of the PT-RS group is determined solely based on the predefined values ​​of s, k, and n.

[0098] The values ​​of k and n are s and N ｓａｍｐｌｅ ｇｒｏｕｐ It may be determined based on the following.

[0099] For example, N ｓａｍｐｌｅ ｇｒｏｕｐ = 4 and N ｇｒｏｕｐ ＰＴ－ＲＳ ={2,4,8},M ｓｃ ＰＵＳＣＨ = 128, all candidate indices of PT-RS samples are given by the common formula floor(sM ｓｃ ＰＵＳＣＨ / 16) + n + k.

[0100] [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ] = [4, 4] is set, s = 0, 1, 14, 16 for port 1 PT-RS, and s = 2, 3, 12, 13 for port 2 PT-RS. When s = 0 and k = 0, 1, 2, 3, n = 0, when s = 1, 2, ..., 13, 14 and k = -2, -1, 0, 1, n = 4, when s = 16 and k = -4, -3, -2, -1, n = 0.

[0101] When calculating the final index m of the candidate sample of the PT-RS in the OFDM symbol before transform precoding, the common formula and the above values ​​of s, k, and n may be used.

[0102] Table 4 shows an example of a mapping method for option 1 of operation 1-1-2.

[0103]

[0104] 9 is a diagram for explaining an example (5) of a PT-RS in the embodiment of the present invention. ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [8, 4], N ｇｒｏｕｐ ＰＴ－ＲＳ = 2 and M ｓｃ ＰＵＳＣＨ = 128, and N ｇｒｏｕｐ ＰＴ－ＲＳ = 2 and M ｓｃ ＰＵＳＣＨ 9 shows the candidate positions of the PT-RS when [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [2, 2], N ｇｒｏｕｐ ＰＴ－ＲＳ = 2 and M ｓｃ ＰＵＳＣＨ If N = 128, then ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [4, 4], N ｇｒｏｕｐ ＰＴ－ＲＳ = 2 and M ｓｃ ＰＵＳＣＨ = 128, and [N ｇｒｏｕｐ ＰＴ－ＲＳ , Nｓａｍｐｌｅ ｇｒｏｕｐ ] = [8, 4], N ｇｒｏｕｐ ＰＴ－ＲＳ = 2 and M ｓｃ ＰＵＳＣＨ PT-RS of port 1 and PT-RS of port 2 when .times. ...

[0105] Table 5 shows an example of a mapping method for option 2 of action 1-1-2.

[0106]

[0107] Note that for s, each PT-RS port and each N ｇｒｏｕｐ ＰＴ－ＲＳ For values ​​of , the value of s may be predefined in the specification and / or may be configured or signaled via higher layer parameters (e.g., RRC signaling, MAC-CE) or physical layer parameters (e.g., DCI or UCI).

[0108] Fig. 10 is a diagram for explaining an example (6) of PT-RS in the embodiment of the present invention. Fig. 10 shows the arrangement of symmetric PT-RS groups when a value of s different from that in Table 4 is predefined. In Fig. 10, ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [2, 2], M ｓｃ ＰＵＳＣＨ = 128, the PT-RS of port 1 has group index s = 11, 21, and the PT-RS of port 2 has group index s = 3, 29, [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [4, 4], M ｓｃ ＰＵＳＣＨ = 128, the PT-RS of port 1 has group index s = 1, 4, 11, 14, and the PT-RS of port 2 has group index s = 2, 6, 9, 13, [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [8, 4], M ｓｃ ＰＵＳＣＨ= 128, the PT-RS of port 1 has group index s = 0, 2, 4, 6, 9, 11, 13, 16, and the PT-RS of port 2 has group index s = 1, 3, 5, 7, 8, 10, 12, 14.

[0109] Fig. 11 is a diagram for explaining an example (7) of PT-RSs according to an embodiment of the present invention. Fig. 11 shows the arrangement of asymmetric PT-RS groups corresponding to different values ​​of s. In Fig. 11, ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [2, 2], M ｓｃ ＰＵＳＣＨ = 128, the PT-RS of port 1 has group index s = 1, 29, and the PT-RS of port 2 has group index s = 3, 31, [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [4, 4], M ｓｃ ＰＵＳＣＨ = 128, the PT-RS of port 1 has group index s = 0, 1, 13, 14, and the PT-RS of port 2 has group index s = 2, 3, 12, 16, [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [8, 4], M ｓｃ ＰＵＳＣＨ = 128, the PT-RS of port 1 has group index s = 0, 1, 2, 3, 8, 10, 12, 14, and the PT-RS of port 2 has group index s = 4, 5, 6, 7, 9, 11, 13, 16.

[0110] To support scenarios with different requirements for phase noise estimation, phase noise compensation capability, and spectral efficiency, two optional orthogonal and quasi-orthogonal PT-RS ports may be specified in operation 1-1-2 as in operation 1-1-1.

[0111] Option 1) Orthogonal PT-RS ports may be defined based on orthogonal resource allocation in the time domain between the PT-RS of one PT-RS port and other PT-RS ports associated with the PDSCH or PUSCH.

[0112] Option 2) Quasi-orthogonal PT-RS ports may be defined, where the same resources in the time domain may be allocated to the PT-RS of one port and the PDSCH or PUSCH associated with the other PT-RS port.

[0113] 12 is a diagram for explaining an example (8) of a PT-RS in the embodiment of the present invention. Option 1 shown in FIG. 12 is [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [2, 4], M ｓｃ ＰＵＳＣＨ Option 2 shown in FIG. 12 shows the empty constellation when [N ｇｒｏｕｐ ＰＴ－ＲＳ , N ｓａｍｐｌｅ ｇｒｏｕｐ ] = [2, 4], M ｓｃ ＰＵＳＣＨ = 128.

[0114] Below, operation 1-2) and the combination of operation 1-1-1) and operation 1-1-2) will be explained.

[0115] Time domain density L ＰＴ－ＲＳ is 2 or more up to the number of PT-RS ports, and based on the method of determining the PT-RS of the nth port by operation 1-1-1, support for PT-RS ports at the OFDM symbol level by TDM is provided, and when the TDM method of the PT-RS group is used within the OFDM symbol of the time index given by operation 1-1-1, more orthogonal PT-RS ports may be supported.

[0116] Option 1) L ＰＴ－ＲＳ For any value of , up to two PT-RS ports may be supported individually by operation 1-1-2.

[0117] Option 2) L ＰＴ－ＲＳ 2 or more up to the number of PT-RS ports may be individually supported by operation 1-1-1.

[0118] Option 3) L ＰＴ－ＲＳA number of PT-RS ports greater than or equal to two may be supported by combining operations 1-1-1 and 1-1-2. For example, ＰＴ－ＲＳ When is 2, up to two ports of PT-RS may be supported by operation 1-1-1, and the time index of the OFDM symbol of the PT-RS is set to l for port n based on operation 1-1-1. ｒｅｆ +i・2+(n-1)OFFSET ＰＴ－ＲＳ For each OFDM symbol where a PT-RS is placed, group-level TDM according to operation 1-1-2 may be used to double the maximum number of ports of the PT-RS for DFT-s-OFDM, and may support up to four ports of the PT-RS.

[0119] It should be noted that the combination of operations 1-1-1 and 1-1-2 (i.e., options 1, 2, and 3) may be predefined in the specification, and / or may be determined based on UE capabilities, and / or may be configured or signaled via higher layer parameters (e.g., RRC signaling, MAC-CE) or physical layer parameters (e.g., DCI or UCI).

[0120] In addition, the PT-RS port index may be predefined in the specification and / or determined based on UE capabilities and / or configured or signaled via higher layer parameters (e.g., RRC signaling, MAC-CE) or physical layer parameters (e.g., DCI or UCI), or may be defined, configured or signaled in association with the relevant DMRS port.

[0121] Operation 2) Supporting multi-port PT-RS based on OCC for DFT-s-OFDM will be described below.

[0122] In NR, PT-RSs are generated based on Gold sequences modulated with π / 2-BPSK. PT-RSs in different cells are differentiated by orthogonal sequences w(k') to mitigate inter-cell interference. In NR, PT-RSs of length N ｓａｍｐｌｅ ｇｒｏｕｐThe OCC of w(k′) is used, where k′ is the sample index within the PT-RS group, and k′=0, 1, ..., N ｓａｍｐｌｅ ｇｒｏｕｐ It is -1.

[0123] PT-RSs are generated at the cluster level. Each PT-RS cluster has N ｇｒｏｕｐ ＰＴ－ＲＳ Each group contains N ｓａｍｐｌｅ ｇｒｏｕｐ At the receiver side, the PT-RS is detected and used for cluster-level phase noise estimation.

[0124] N ｇｒｏｕｐ ＰＴ－ＲＳ ・N ｓａｍｐｌｅ ｇｒｏｕｐ Ports of PT-RS may be supported for DFT-s-OFDM based on the OCC.

[0125] Option 1) Replace the OCC sequence w(k′) in the PT-RS of NR to obtain a sequence of length N ｇｒｏｕｐ ＰＴ－ＲＳ ・N ｓａｍｐｌｅ ｇｒｏｕｐ Each PT-RS sample with index m′ in one OFDM symbol before DFT precoding may be multiplied by OCC w(m′), where m′ is the sample index within the symbol, and m′=N ｓａｍｐｌｅ ｇｒｏｕｐ s'+k', where s' is the group index, and s'=0, 1, ..., N ｇｒｏｕｐ ＰＴ－ＲＳ −1. k′=0, 1, ..., N ｓａｍｐｌｅ ｇｒｏｕｐ It is -1.

[0126] Option 2) In the PT-RS of NR, a length N is added to the beginning of the OCC sequence. ｇｒｏｕｐ ＰＴ－ＲＳ OCC sequence w ｇ (s′) may be added. Index m′=N within one OFDM symbol before DFT precoding ｓａｍｐｌｅ ｇｒｏｕｐ For each PT-RS sample of s′+k′, OCCw ｓ (k') wｇ It may be multiplied by (s').

[0127] w ｇ (s′) is the OCC group for each group s′, s′=0, 1, . . . , N ｇｒｏｕｐ ＰＴ－ＲＳ It is -1. ｓ (k') is the OCC group for each sample in the group, and m' = N ｓａｍｐｌｅ ｇｒｏｕｐ s'+k', k'=0, 1, . . . , N ｓａｍｐｌｅ ｇｒｏｕｐ m' is the sample index within the symbol, and m'=N ｓａｍｐｌｅ ｇｒｏｕｐ s'+k', where s' is the group index, and s'=0, 1, ..., N ｇｒｏｕｐ ＰＴ－ＲＳ It is -1.

[0128] Option 3) The OCC sequence w(k') in the PT-RS of Option 1) NR may be replaced with an OCC sequence w(l') of the OFDM symbol number length of the PT-RS. All PT-RS samples of index l' within one OFDM symbol for the PT-RS may be multiplied by the same OCC w(l'). l' is the index of the OFDM symbol allocated for the PT-RS in the PDSCH or PUSCH before transform precoding.

[0129] Note that PT-RSs with even more ports may be supported by combining operation 2) and operation 1).

[0130] Mathematical formula 1 is a formula for generating the PT-RS sequence in NR (see non-patent document 3).

[0131]

[0132] According to equation 1, N ｇｒｏｕｐ ＰＴ－ＲＳ ・N ｓａｍｐｌｅ ｇｒｏｕｐn PT-RSs are generated and mapped to one symbol of the PUSCH. At the receiver side, phase noise estimation and compensation are performed based on the PT-RSs detected within one symbol. Legacy orthogonal sequences are based on the group level, and each PT-RS group has different n ＲＮＴＩ The different OCCs signaled by are multiplied.

[0133] 13 is a diagram illustrating an example (1) of multiplexing PT-RSs using OCC in an embodiment of the present invention. As shown in FIG. 13, to support more orthogonal PT-RS ports for DFT-s-OFDM, in operation 2), OCC based on the PT-RS cluster level may be applied before transform precoding. FIG. 13 shows a mathematical formula for generating a sequence for multiplying the OCCs of option 1, option 2, and option 3 in operation 2).

[0134] Equation 2 is the equation for generating the sequence of option 1 of operation 2). Table 6 shows the CDM (Code division multiplexing) definition of option 1 of operation 2).

[0135]

[0136]

[0137] 14 is a diagram for explaining an example (2) of multiplexed PT-RSs by OCC in the embodiment of the present invention. ｇｒｏｕｐ ＰＴ－ＲＳ = 2, N ｓａｍｐｌｅ ｇｒｏｕｐ Table 7 shows the PT-RSs that are OCC multiplexed in CDM4 arranged in OFDM symbols when N = 2. ｇｒｏｕｐ ＰＴ－ＲＳ = 2, N ｓａｍｐｌｅ ｇｒｏｕｐ 1 shows the weight of CDM8 when .times. ...

[0138]

[0139] Equation 3 is the equation for generating the sequence for option 2 of operation 2). Table 7 shows the CDM definition for option 1 of operation 2).

[0140]

[0141]

[0142] 15 is a diagram for explaining an example (3) of multiplexed PT-RSs by OCC in the embodiment of the present invention. ｇｒｏｕｐ ＰＴ－ＲＳ = 2, N ｓａｍｐｌｅ ｇｒｏｕｐ Table 9 shows the OCC-multiplexed PT-RSs arranged in the OFDM symbol when N = 2. ｇｒｏｕｐ ＰＴ－ＲＳ = 4, N ｓａｍｐｌｅ ｇｒｏｕｐ , where σ is the weight of the CDM.

[0143]

[0144] Operation 3) Supporting multi-port PT-RS based on orthogonal sequences for DFT-s-OFDM will be described below.

[0145] Below, we will explain operation 3-1) Support for multi-port PT-RS for DFT-s-OFDM based on the legacy PT-RS generation method. In NR, the PT-RS is generated based on a Gold sequence modulated with π / 2-BPSK, and one-port PT-RS is supported.

[0146] Multiple orthogonal sequences are ｉｎｉｔ The PT-RS may be generated by a pseudo-random sequence c(i) initialized by:

[0147] Using the NR PT-RS sequence generation method, different c ｉｎｉｔ Generate different orthogonal sequences for multiple ports based on a new parameter N associated with IndexPort=1, 2, ..., maxNofPorts. ｐｏｒｔｓｉｎｉｔ For the initialization of c(i), N ｐｏｒｔｓｉｎｉｔ Use ｉｎｉｔ is the orthogonal sequence r ｍ (m') will be different values ​​for different IndexPorts, thereby supporting multi-port PT-RS.

[0148] Option 1) c ｉｎｉｔ = (2 １７ ・N ｐｏｒｔｓｉｎｉｔ (N ｓｙｍｂ ｓｌｏｔ n ｓ，ｆ μ +l+1) (2N ＩＤ +1) +2N ＩＤ ) mod 2 ３１ Option 2) c ｉｎｉｔ = (2 １７ ・(N ｓｙｍｂ ｓｌｏｔ n ｓ，ｆ μ +l+N ｐｏｒｔｓｉｎｉｔ +1) (2N ＩＤ +1) +2N ＩＤ ) mod 2 ３１ Option 3) c ｉｎｉｔ = (2 １７ ・(N ｓｙｍｂ ｓｌｏｔ n ｓ，ｆ μ +l+1) (2N ＩＤ +N ｐｏｒｔｓｉｎｉｔ +1) +2N ＩＤ ) mod 2 ３１ Option 4) c ｉｎｉｔ = (2 １７ ・(N ｓｙｍｂ ｓｌｏｔ n ｓ，ｆ μ +l+1) (2N ＩＤ +1) +2N ＩＤ +N ｐｏｒｔｓｉｎｉｔ ) mod 2 ３１

[0149] An example of option 1) is shown below. To support 4-port PT-RS with IndexPort=1, 2, 3, and 4, ｐｏｒｔｓｉｎｉｔ = 1, 2, 3, 4. The pseudorandom sequence c(i) is ｉｎｉｔ = (2 １７ ・N ｐｏｒｔｓｉｎｉｔ (N ｓｙｍｂ ｓｌｏｔ n ｓ，ｆ μ +l+1) (2N ＩＤ +1) +2N ＩＤ ) mod 2 ３１ For the PT-RS port with index 1,ｐｏｒｔｓｉｎｉｔ = 1, and each PT-RS sample in one OFDM symbol is ｉｎｉｔ = (2 １７ ・1・(N ｓｙｍｂ ｓｌｏｔ n ｓ，ｆ μ +l+1) (2N ＩＤ +1) +2N ＩＤ ) mod 2 ３１ The pseudorandom sequence c(i) is generated based on the NR formula using a pseudorandom sequence c(i) initialized by

[0150] New parameters maxNrofPorts and / or N ｐｏｒｔｓｉｎｉｔ may be defined for a PT-RS for DFT-s-OFDM. The parameter may be set or signaled by a physical layer parameter (e.g., DCI or UCI), or may be set or signaled by a higher layer parameter (e.g., RRC signaling, MAC-CE).

[0151] The maxNrofPorts may indicate the maximum number of ports of the PT-RS for DFT-s-OFDM. The actual number of ports of the PT-RS may be equal to or less than maxNrofPorts.

[0152] N ｐｏｒｔｓｉｎｉｔ is port N ｐｏｒｔｓｉｎｉｔ For c ｉｎｉｔ The parameter for calculating N may be notified. ｐｏｒｔｓｉｎｉｔ = 1, c ｉｎｉｔ is port N ｐｏｒｔｓｉｎｉｔ It may be calculated by applying different options to N ｐｏｒｔｓｉｎｉｔ may be associated with a PT-RS port index and predefined in the specification, and may not require notification or configuration.

[0153] Equation 4 is a mathematical expression showing NR and PT-RS sequence generation in Operation 3-1) Option 1). Table 10 shows the c defined for each maxNrofPort PT-RS port in Operation 3-1) Option 1). ｉｎｉｔ Shows.

[0154]

[0155]

[0156] Below, we will explain operation 3-2) Supporting multi-port PT-RS for DFT-s-OFDM based on a low-PAPR sequence generation method. In NR, the PT-RS is generated based on a Gold sequence modulated with π / 2-BPSK, and one-port PT-RS is supported.

[0157] Cyclic shift values ​​based on low-PAPR sequence generation type 1 (see Non-Patent Document 3) may be defined to generate multiple orthogonal sequences.

[0158] In operation 3-2), the PT-RS is generated based on low-PAPR sequence generation type 1, and a cyclic shift α may be introduced to support multi-port PT-RS.

[0159] Equation 5 shows the equation for generating low-PAPR sequence type 1 used in operation 3-2).

[0160]

[0161] Equation 6 shows the formula for the cyclic shift α.

[0162]

[0163] For example, the upper layer parameters maxNrofPort=4, α ～ When π / 2 is notified, the PT-RS sequence for IndexPort=1, 2, 3, 4 is shown in Equation 7.

[0164]

[0165] A new parameter maxNrofPorts may be defined for PT-RS for DFT-s-OFDM, and may be configured or signaled by a physical layer parameter (e.g., DCI or UCI) or by a higher layer parameter (e.g., RRC signaling, MAC-CE).

[0166] The maxNrofPorts may indicate the maximum number of ports of the PT-RS for DFT-s-OFDM. The actual number of ports of the PT-RS may be equal to or less than maxNrofPorts.

[0167] In operation 3-2), the parameter α ～ Add α ～ is the granularity of the phase shift based on maxNrofPorts. Given maxNrofPorts, the phase shift value of the base sequence α is limited, and different α will generate different PT-RS sequences for different ports.

[0168] Table 11 shows a sequence generation method based on low-PAPR sequence generation type 1 for two-port PT-RS.

[0169]

[0170] Table 12 shows a sequence generation method based on low-PAPR sequence generation type 1 for a 4-port PT-RS.

[0171]

[0172] Table 13 shows a sequence generation method based on low-PAPR sequence generation type 1 for PT-RS with maxNrofPorts number of ports.

[0173]

[0174] The above operations related to multiple PT-RS ports may be combined. For example, to support a PT-RS with a larger number of ports, operation 3) and operation 2) may be combined. For example, to support a PT-RS with a larger number of ports, operation 3) and operation 1) may be combined. For example, to support a PT-RS with a larger number of ports, operation 3), operation 2), and operation 1) may be combined.

[0175] A UE capability may be defined indicating whether or not to support multi-port PT-RS for a DFT-s-OFDM PDSCH or PUSCH. A UE capability may be defined indicating the maximum number of ports for a PT-RS for a DFT-s-OFDM PDSCH or PUSCH. A UE capability may be defined indicating whether or not to support multi-port PT-RS using TDM for a DFT-s-OFDM PDSCH or PUSCH. A UE capability may be defined indicating whether or not to support multi-port PT-RS using CDM for a DFT-s-OFDM PDSCH or PUSCH.

[0176] The above embodiment makes it possible to support multi-port PT-RS in DFT-s-OFDM.

[0177] That is, in a wireless communication system, it is possible to support a multi-port phase tracking reference signal (PT-RS).

[0178] (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.

[0179] <Base Station 10> Fig. 16 is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention. As shown in Fig. 16, 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 Fig. 16 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] <Terminal 20> Fig. 17 is a diagram showing an example of the functional configuration of terminal 20 in an embodiment of the present invention. As shown in Fig. 17, 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. 17 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] (Hardware Configuration) The block diagrams (FIGS. 16 and 17) 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 directly or indirectly connected (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.

[0188] 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.

[0189] 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. 18 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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. 16 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. 17 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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).

[0198] 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.

[0199] 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.

[0200] Fig. 19 shows an example configuration of a vehicle 2001. As shown in Fig. 19, 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.

[0201] 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.

[0202] 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).

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] (Summary of the embodiment) As described above, according to the embodiment of the present invention, there is provided a terminal having a control unit that inserts a PT-RS (Phase Tracking Reference Signal) to which at least one of time division multiplexing and code division multiplexing is applied into a signal to which DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) is applied, and a transmission unit that transmits each of the multiplexed PT-RS from each of a plurality of ports.

[0211] With the above configuration, it is possible to support multi-port PT-RS in DFT-s-OFDM. That is, it is possible to support multi-port PT-RS (Phase Tracking Reference Signal) in a wireless communication system.

[0212] The controller may apply symbol-level or PT-RS group-level multiplexing to the PT-RSs, which can support multi-port PT-RSs in DFT-s-OFDM.

[0213] The controller may shift the PT-RS corresponding to a port in a region before DFT is applied to generate the PT-RS corresponding to another port. This configuration makes it possible to support multi-port PT-RS in DFT-s-OFDM.

[0214] The controller may apply code division multiplexing using an orthogonal cover code (OCC) to the PT-RS, which enables support of multi-port PT-RS in DFT-s-OFDM.

[0215] The controller may perform code division multiplexing to generate the PT-RS using an orthogonal sequence, which enables support of multi-port PT-RS in DFT-s-OFDM.

[0216] Furthermore, according to an embodiment of the present invention, there is provided a communication method in which a terminal executes the steps of inserting a PT-RS (Phase Tracking Reference Signal) to which at least one of time division multiplexing and code division multiplexing is applied into a signal to which DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) is applied, and transmitting each of the multiplexed PT-RS from each of a plurality of ports.

[0217] With the above configuration, it is possible to support multi-port PT-RS in DFT-s-OFDM. That is, it is possible to support multi-port PT-RS (Phase Tracking Reference Signal) in a wireless communication system.

[0218] (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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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).

[0223] 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.

[0224] 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 sent to another device.

[0225] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0244] 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."

[0245] 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.

[0246] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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."

[0266] 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.

[0267] 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.

[0268] 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."

[0269] 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).

[0270] 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.

[0271] 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 inserts a PT-RS (Phase Tracking Reference Signal) to which at least one of time division multiplexing and code division multiplexing is applied into a signal to which DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) is applied, and a transmission unit that transmits each of the multiplexed PT-RS from each of multiple ports.

2. The terminal according to claim 1, wherein the control unit applies symbol-level or PT-RS group-level multiplexing to the PT-RS.

3. The terminal according to claim 1, wherein the control unit shifts a PT-RS corresponding to a certain port in a region before DFT is applied to generate a PT-RS corresponding to another port.

4. The terminal according to claim 1, wherein the control unit applies code division multiplexing using an orthogonal cover code (OCC) to the PT-RS.

5. The terminal according to claim 1, wherein the control unit performs code division multiplexing to generate a PT-RS using an orthogonal sequence.

6. A communication method in which a terminal executes the steps of: inserting a PT-RS (Phase Tracking Reference Signal) to which at least one of time division multiplexing and code division multiplexing is applied into a signal to which DFT-s-OFDM (Discrete Fourier Transform - Spread - Orthogonal Frequency Division Multiplexing) is applied; and transmitting each of the multiplexed PT-RS from each of multiple ports.

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