Terminal device, base station device, and communication method

Abstract

To provide a terminal device, a base station device, and a communication method for efficiently performing communication.SOLUTION: In a radio communication system, a terminal device comprises: a receiving unit that receives a PDCCH in which a DCI format for instructing transmission of a PUSCH is mapped; and a transmitting unit that transmits the PUSCH and generates a DMRS for the PUSCH and a PTRS for the PUSCH. A first higher layer parameter relates to the maximum number of DMRS ports. When the first higher layer parameter is not set, a first field in the DCI format is constituted of a first number of bits. When the first higher layer parameter is set, the first field in the DCI format is constituted of a second number of bits. A PTRS port for the PTRS is determined on the basis of the first field and one or more DMRS ports for the DMRS.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a terminal device, a base station device, and a communication method.

Background Art

[0002] The radio access method and radio network of cellular mobile communication (hereinafter also referred to as "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") are being studied in the Third Generation Partnership Project (3GPP: 3 rd Generation Partnership Project). In LTE, the base station device is also called an eNodeB (evolved NodeB), and the terminal device is also called a UE (User Equipment). LTE is a cellular communication system in which a plurality of areas covered by a base station device are arranged in a cell shape. A single base station device may manage a plurality of serving cells.

[0003] In 3GPP, in order to propose to the International Mobile Telecommunication (IMT)-2020, which is the standard of the next-generation mobile communication system formulated by the International Telecommunication Union (ITU), the study of the next-generation standard (NR: New Radio) is being carried out (Non-Patent Document 1). NR is required to satisfy the requirements assuming three scenarios of eMBB (enhanced Mobile BroadBand )), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication) in a single technical framework.

[0004] In 3GPP, the expansion of services supported by NR is being studied (Non- Patent document 2). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "New SID proposal: Study on New Radio Access Technology", RP-160671, NTT docomo, 3GPP TSG RAN Meeting #71, Goteborg, Sweden, 7th - 10th March, 2016. [Non-Patent Document 2] “Release 17 package for RAN”, RP-193216, RAN chairman, RAN1 chairman, RAN2 chairman, RAN3 chairman, 3GPP TSG RAN Meeting #86, Sitges, Spain, 9th ― 12th December, 2019 [Non-Patent Document 3] “Release 18 package summary”, RP-213469, RAN chairman, RAN1 chairman, RAN2 chairman, RAN3 chairman, 3GPP TSG RAN Meeting #94-e, 6th ― 17th December, 2021 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a terminal device that performs efficient communication, a communication method used in the terminal device, a base station device that performs efficient communication, and a communication method used in the base station device. [Means for solving the problem]

[0007] (1) A first aspect of the present invention is a terminal device, comprising: a receiving unit that receives a PDCCH to which a DCI format for instructing transmission of a PUSCH is mapped; a transmitting unit that transmits the PUSCH; and the transmitting unit that generates a DMRS for the PUSCH and a PTRS for the PUSCH. A first upper layer parameter is related to the maximum number of DMRS ports for the DMRS. When the first upper layer parameter is not set, a first field in the DCI format is composed of a first number of bits. When the first upper layer parameter is set, the first field in the DCI format is composed of a second number of bits. Based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined.

[0008] (2) Further, a second aspect of the present invention is a base station device, comprising: a transmitting unit that transmits a PDCCH to which a DCI format for instructing transmission of a PUSCH is mapped; and a receiving unit that receives the PUSCH. A DMRS for the PUSCH and a PTRS for the PUSCH are generated. A first upper layer parameter is related to the maximum number of DMRS ports for the DMRS. When the first upper layer parameter is not set, a first field in the DCI format is composed of a first number of bits. When the first upper layer parameter is set, the first field in the DCI format is composed of a second number of bits. Based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined.

[0009] (3) Further, a third aspect of the present invention is a communication method used in a terminal device, the PUSCH A step of receiving a PDCCH to which a DCI format for instructing transmission of is mapped, a step of transmitting the PUSCH, and a step of generating DMRS for the PUSCH and PTRS for the PUSCH. A first upper layer parameter is related to the maximum number of DMRS ports for the DMRS. When the first upper layer parameter is not set, the first field in the DCI format is configured with a first number of bits. When the first upper layer parameter is set, the first field in the DCI format is configured with a second number of bits. Based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined.

[0010] (4) Further, a fourth aspect of the present invention is a communication method used in a base station device, including a step of transmitting a PDCCH to which a DCI format for instructing transmission of PUSCH is mapped, and a step of receiving the PUSCH. DMRS for the PUSCH and PTRS for the PUSCH are generated. A first upper layer parameter is related to the maximum number of DMRS ports for the DMRS. When the first upper layer parameter is not set, the first field in the DCI format is configured with a first number of bits. When the first upper layer parameter is set, the first field in the DCI format is configured with a second number of bits. Based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined.

Advantages of the Invention

[0011] According to the present invention, the terminal device can communicate efficiently. Also, the base station device can communicate efficiently.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described.

[0014] floor(C) may be a floor function for a real number C. For example, floor(C) may be a function that outputs the largest integer within a range not exceeding the real number C. ceil(D) may be a ceiling function for a real number D. For example, ceil(D) may be a function that outputs the smallest integer within a range not less than the real number D. mod(E,F) is a function that outputs the remainder when E is divided by F and may be a function that outputs a value corresponding to the remainder when E is divided by F It is also acceptable. exp(G) = e^G. Here, e is the Napier's constant. H^I represents the I-th power of H. max(J, K) is a function that outputs the maximum value between J and K. Here, when J and K are equal, max(J, K) is a function that outputs J or K. min(L, M) is a function that outputs the minimum value between L and M. Here, when L and M are equal, min(L, M) is a function that outputs L or M. round(N) is a function that outputs the integer value closest to N. "·" represents multiplication.

[0015] In a wireless communication system according to an aspect of the present embodiment, OFDM (Orthogonal Frequency Division Multiplex) is at least used. An OFDM symbol is a unit in the time domain of OFDM. That is, an OFDM symbol includes at least one or a plurality of subcarriers. An OFDM symbol is converted into a time - continuous signal in baseband signal generation. In the downlink, CP - OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplex) is at least used. In the uplink, either CP - OFDM or DFT - s - OFDM (Discrete Fourier Transform - spread - Orthogonal Frequency Division Multiplex) is used. DFT - s - OFDM may be obtained by applying transform precoding to CP - OFDM.

[0016] The OFDM symbol may be a name that includes the CP added to the OFDM symbol. That is, a certain OFDM symbol may be composed of the certain OFDM symbol and the CP added to the certain OFDM symbol.

[0017] FIG. 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. In FIG. 1, the wireless communication system is configured to include at least terminal devices 1A to 1C and a base station device 3 (BS#3: Base station#3). Hereinafter, the terminal devices 1A to 1C are also referred to as terminal device 1 (UE#1: User Equipment#1).

[0018] The base station device 3 may be configured to include one or more transmission devices (or transmission points, transceiver devices, transceiver points). When the base station device 3 is configured by a plurality of transmission devices, each of the plurality of transmission devices may be arranged at different positions.

[0019] The base station device 3 may provide one or more serving cells. A serving cell may be defined as a set of resources used for wireless communication. Also, a serving cell is also referred to as a cell.

[0020] A serving cell may be configured to include one or both of one downlink component carrier (downlink carrier) and one uplink component carrier (uplink carrier). A serving cell may be configured to include one or both of two or more downlink component carriers and two or more uplink component carriers. The downlink component carrier and the uplink component carrier are also collectively referred to as a component carrier (carrier).

[0021] For example, one resource grid may be provided for each component carrier. Also, one resource grid may be provided for each set of one component carrier and a subcarrier spacing configuration μ. Here, the subcarrier spacing configuration μ is also referred to as numerology. For example, one resource grid may be provided for a set of a certain antenna port p, a certain subcarrier spacing configuration μ, and a certain transmission direction x.

[0022] The subcarrier spacing (subcarrier spacing configuration) μ may be any one of 0, 1, 3 , and 4 for the synchronization channel. The subcarrier spacing configuration (subcarrier spacing configuration) μ may be 0, 1, 2, or 3 for the data channel. The synchronization channel may be a general term for PSS, SSS, and PBCH. The data channel may be a general term for at least PDSCH, PUSCH, PDCCH, and PUCCH.

[0023] The resource grid includes N size,μ grid,x N RB sc subcarriers. Here, the reso -source grid starts from the common resource block N start,μ grid,x . Also, the common resource block N start,μ grid,x is also referred to as the reference point of the resource grid.

[0024] The resource grid includes N subframe,μ symb OFDM symbols.

[0025] The subscript x added to the parameters related to the resource grid indicates the transmission direction. For example, the subscript x indicates either the downlink or the uplink. It may be used for

[0026] N size,μ grid,x is indicated by the parameters provided by the RRC layer (e.g., parameter -ter CarrierBandwidth) offset setting. N start,μ grid,x is the bandwidth setting indicated by the parameters provided by the RRC layer (e.g., parameter, OffsetToCarrier). The offset setting and the bandwidth setting are settings used for the configuration of the SCS-specific carrier.

[0027] For a certain subcarrier spacing setting μ, the subcarrier spacing (SCS: SubCarrier Spacing ) Δf may be Δf = 2 μ · 15 kHz. Here, the subcarrier spacing setting μ may indicate any one of 0 , 1, 2, 3, or 4.

[0028] FIG. 2 is an example showing the relationship between the subcarrier spacing setting μ, the number of OFDM symbols N per slot slot symb , and the CP (cyclic Prefix) setting according to one aspect of the present embodiment. In FIG. 2A, for example, when the subcarrier spacing setting μ is 2 and the CP setting is normal cyclic prefix, N slot symb = 14, N frame,μ slot = 40, N subframe, μ slot = 4. Also, in FIG. 2B, for example, when the subcarrier spacing setting μ is 2 and the CP setting is extended cyclic prefix, N slot symb = 12, N frame ,μ slot = 40, N subframe,μ slot = 4.

[0029] Time unit T c may be used to represent the length of the time domain. Time unit T c is T c = 1 / (Δf max · N f ). Δf max = 480 kHz. N f = 409 6. The constant κ is κ = Δf max · N f / (Δf ref N f,ref ) = 64. Δf ref is 1 5 kHz. N f,ref is 2048.

[0030] Transmission of signals in the downlink and / or transmission of signals in the uplink may be organized into a radio frame (system frame, frame) of length T f . T f = (Δf max N f / 100) · T s = 10 ms. The radio frame is composed of 10 sub - frames. The length of the sub - frame T sf = (Δf max N f / 1000) · T s = 1 ms. The number of OFDM symbols per sub - frame is N subframe,μ symb = N slot symb N subframe,μ slot .

[0031] An OFDM symbol is a unit in the time domain of a communication system. For example, the OFDM symbol may be a unit in the time domain of CP-OFDM. Also, the OFDM symbol may be a unit in the time domain of DFT-s-OFDM.

[0032] A slot may be composed of a plurality of OFDM symbols. For example, one slot may be composed of N consecutive OFDM symbols. slot symb For example, in the case of normal CP setting, N may be 14. Also, in the case of extended CP setting, N may be 12. slot symb = 12. slot symb

[0033] For a given subcarrier spacing setting μ, the number and index of slots included in a subframe may be provided. For example, the slot index n μ s may be given in ascending order as integer values in the range from 0 to N subframe,μ slot -1 in the subframe. For a given subcarrier spacing setting μ, the number and index of slots included in a radio frame may be provided. Also, the slot index n μ s,f may be given in ascending order as integer values in the range from 0 to N frame,μ slot -1 in the radio frame.

[0034] FIG. 3 is a diagram showing an example of a method for configuring a resource grid according to an aspect of the present embodiment. The horizontal axis in FIG. 3 indicates the frequency domain. In FIG. 3, a configuration example of a resource grid with a subcarrier spacing μ1 in a component carrier 300 and a configuration example of a resource grid with a subcarrier spacing μ2 in a certain component carrier are shown. Thus, for a certain component carrier, one or more subcarrier spacings may be set. In FIG. 3, it is assumed that μ1 = μ2 - 1, but various aspects of the present embodiment are not limited to the condition of μ1 = μ2 - 1.

[0035] The component carrier 300 is a band having a predetermined width in the frequency domain.

[0036] The point 3000 is an identifier for specifying a certain subcarrier. Po Int 3000 is also referred to as point A. The common resource block (CRB) set 3100 is a set of common resource blocks for the subcarrier spacing setting μ1.

[0037] Among the common resource block sets 3100, the common resource block including the point 3000 (the black single-color block in the common resource block set 3100 in FIG. 3) is also referred to as the reference point of the common resource block set 3100. Co The reference point of the common resource block set 3100 may be the common resource block at index 0 in the common resource block set 3100.

[0038] The offset 3011 is the offset from the reference point of the common resource block set 3100 to the reference point of the resource grid 3001. The offset 3011 is indicated by the number of common resource blocks for the subcarrier spacing setting μ1. The resource grid 3001 starts from the reference point of the resource grid 3001 and has N size,μ grid1,xincludes a plurality of common resource blocks.

[0039] The offset 3013 is the offset from the reference point of the resource grid 3001 to the reference point (N start,μ BWP,i1 ) of the BWP (BandWidth Part) 3003 of index i1.

[0040] The common resource block set 3200 is a set of common resource blocks for the subcarrier spacing setting μ2.

[0041] Among the common resource block sets 3200, the common resource block including the point 3000 (the black single-color block in the common resource block set 3200 in FIG. 3) is also referred to as the reference point of the common resource block set 3200. The reference point of the common resource block set 3200 may be the common resource block of index 0 in the common resource block set 3200.

[0042] The offset 3012 is the offset from the reference point of the common resource block set 3200 to the reference point of the resource grid 3002. The offset 3012 is indicated by the number of common resource blocks for the subcarrier spacing μ2. The resource grid 3002 starts from the reference point of the resource grid 3002 and includes N size,μ grid2,x a plurality of common resource blocks.

[0043] The offset 3014 is the offset from the reference point of the resource grid 3002 to the reference point (N start,μ BWP,i2 ) of the BWP 3004 of index i2.

[0044] FIG. 4 is a diagram showing a configuration example of the resource grid 3001 according to an aspect of the present embodiment. In the resource grid of FIG. 4, the horizontal axis is the OFDM symbol index l sym and the vertical axis is the subcarrier index k. scIt is. The resource grid 3001 includes N size,μ grid1,x N RB sc sub - carriers and includes N subframe,μ symb OFDM symbols. Within the resource grid, the resource specified by the sub - carrier index k sc and the OFDM symbol index l sym is also called a resource element (RE).

[0045] A resource block (RB) includes N RB sc consecutive sub - carriers . The resource block is a general term for a common resource block, a physical resource block (PRB), and a virtual resource block (VRB). Here, N = 12. RB sc

[0046] A resource block unit is a set of resources corresponding to 1 OFDM symbol in one resource block. That is, one resource block unit includes 12 resource elements corresponding to 1 OFDM symbol in one resource block.

[0047] For the common resource block with a certain sub - carrier spacing setting μ, in a certain common resource block set, it is indexed in ascending order from 0 in the frequency domain. The common resource block with index 0 for a certain sub - carrier spacing setting μ includes (or collides with, coincides with) point 3000. The index n μ CRB of the common resource block for a certain sub - carrier spacing setting μ μ ​CRB = ceil(k sc / N RB sc ) satisfies the relationship. Here, k sc The subcarrier with k = 0 has the same center frequency as the center frequency of the subcarrier corresponding to point 3000.

[0048] For a physical resource block with a certain subcarrier spacing setting μ, in a certain BWP, The index is assigned in ascending order from 0 in the frequency domain. For a physical resource block with a certain subcarrier spacing setting μ, the index n of the physical resource block μ PRB is such that n μ CRB = n μ PRB + N start,μ BWP,i satisfies the relationship. Here, N start,μ BWP,i indicates the reference point of the BWP with index i.

[0049] A BWP is defined as a subset of the common resource blocks included in the resource grid and is. A BWP starts from the reference point N of the BWP start,μ BWP,i and contains N size,μ BWP,i common resource blocks. The BWP set for the downlink carrier is also called the downlink BWP. The BWP set for the uplink component carrier is also called the uplink BWP.

[0050] An antenna port may be defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. For example, the channel may correspond to a physical channel. Also, the symbol may correspond to an OFDM symbol. Also, the symbol may correspond to a resource block unit. Also, the symbol may correspond to a resource element.

[0051] If the large scale property of the channel over which symbols are transmitted at one antenna port can be estimated from the channel over which symbols are transmitted at another antenna port, the two antenna ports are said to be Quasi Co-Located (QCL). Here, the large scale property may at least include the long-term characteristics of the channel. The large scale property may at least include some or all of the delay spread, Doppler spread, Doppler shift, average gain, average delay, and some of the spatial Rx parameters. For the first antenna port and the second antenna port to be QCL with respect to the beam parameters, the receive beam assumed by the receiving side for the first antenna port and the receive beam assumed by the receiving side for the second antenna port may be the same (or corresponding). For the first antenna port and the second antenna port to be QCL with respect to the beam parameters, the transmit beam assumed by the receiving side for the first antenna port and the transmit beam assumed by the receiving side for the second antenna port may be the same (or corresponding). The terminal device 1 may assume that the two antenna ports are QCL if the large scale property of the channel over which symbols are transmitted at one antenna port can be estimated from the channel over which symbols are transmitted at another antenna port. The fact that two antenna ports are QCL may also mean that it is assumed that the two antenna ports are QCL.

[0052] It may be that the two antenna ports are type A QCLs, meaning that the first large-scale characteristic of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. It may be that the two antenna ports are type B QCLs, meaning that the second large-scale characteristic of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. It may be that the two antenna ports are type C QCLs, meaning that the third large-scale characteristic of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. It may be that the two antenna ports are type D QCLs, meaning that the fourth large-scale characteristic of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. The first large-scale characteristic may include all of Doppler shift, Doppler spread, average delay, and delay spread. The second large-scale characteristic may include all of Doppler shift and Doppler spread. The third large-scale characteristic may include all of Doppler shift and average delay. The fourth large-scale characteristic may include spatial reception parameters (information on spatial direction, beam information). The antenna port for DMRS may be a DMRS port. The antenna port for PTRS may be a PTRS port. The antenna port related to PTRS may be a PTRS port. The antenna port for SRS may be an SRS port. The antenna port for DMRS may be a DMRS port. The antenna port related to DMRS may be a DMRS port.

[0053] Carrier aggregation is the aggregation of multiple serving Communication may also be performed using cells. Also, carrier aggregation may be performed using a plurality of aggregated component carriers. Also, carrier aggregation may be performed using a plurality of aggregated downlink component carriers. Also, carrier aggregation may be performed using a plurality of aggregated uplink component carriers.

[0054] FIG. 5 is a schematic block diagram showing a configuration example of the base station apparatus 3 according to one aspect of the present embodiment. As shown in FIG. 5, the base station apparatus 3 includes at least a part or all of a radio transmission / reception unit (physical layer processing unit) 30 and / or a part of a higher layer processing unit 34. The radio transmission / reception unit 30 includes at least a part or all of an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 includes at least a part or all of a medium access control layer processing unit 35 and a radio resource control (RRC) layer processing unit 36.

[0055] The radio transmission / reception unit 30 includes at least a part or all of a radio transmission unit 30a and a radio reception unit 30b. Here, the device configurations of the baseband units included in the radio transmission unit 30a and the radio reception unit 30b may be the same or different. Also, the device configurations of the RF units included in the radio transmission unit 30a and the radio reception unit 30b may be the same or different. Also, the device configurations of the antenna units included in the radio transmission unit 30a and the radio reception unit 30b may be the same or different.

[0056] For example, the wireless transmission unit 30a may generate and transmit the baseband signal of PDSCH. For example, the wireless transmission unit 30a may generate and transmit the baseband signal of PDCCH. For example, the wireless transmission unit 30a may generate and transmit the baseband signal of PBCH. For example, the wireless transmission unit 30a may generate and transmit the baseband signal of the synchronization signal. For example, the wireless transmission unit 30a may generate and transmit the baseband signal of PDSCH DMRS. For example, the wireless transmission unit 30a may generate and transmit the baseband signal of PDCCH DMRS. For example, the wireless transmission unit 30a may generate and transmit the baseband signal of CSI-RS. For example, the wireless transmission unit 30a may generate and transmit the baseband signal of DL PTRS.

[0057] For example, the wireless reception unit 30b may receive PRACH. For example, the wireless reception unit 30b may receive and demodulate PUCCH. The wireless reception unit 30b may receive and demodulate PUSCH. For example, the wireless reception unit 30b may receive PUCCH DMRS. For example, the wireless reception unit 30b may receive PUSCH DMRS. For example, the wireless reception unit 30b may receive UL PTRS. For example, the wireless reception unit 30b may receive SRS.

[0058] The upper layer processing unit 34 outputs downlink data (transport block) to the wireless transceiver unit 30 (or the wireless transmission unit 30a). The upper layer processing unit 34 performs the processing of the MAC (Medium Access Control) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

[0059] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs the processing of the MAC layer.

[0060] The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs the processing of the RRC layer. The line resource control layer processing unit 36 manages various setting information / parameters (RRC parameters of the terminal device 1). The radio resource control layer processing unit 36 sets parameters based on the RRC message received from the terminal device 1.

[0061] The wireless transceiver unit 30 (or the wireless transmitter unit 30a) performs processes such as modulation and coding. The wireless transceiver unit 30 (or the wireless transmitter unit 30a) modulates, codes, and generates a physical signal by generating a baseband signal (conversion to a time - continuous signal), and transmits it to the terminal device 1. The wireless transceiver unit 30 (or the wireless transmitter unit 30a) may arrange the physical signal on a certain component carrier and transmit it to the terminal device 1.

[0062] The wireless transceiver unit 30 (or the wireless receiver unit 30b) performs processes such as demodulation and decoding. The wireless transceiver unit 30 (or the wireless receiver unit 30b) separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the upper - layer processing unit 34. The wireless transceiver unit 30 (or the wireless receiver unit 30b) may perform a channel access procedure prior to the transmission of the physical signal.

[0063] The RF unit 32 converts the signal received via the antenna unit 31 into a baseband signal (down convert) by quadrature demodulation, and removes unnecessary frequency components. The RF unit 32 outputs the processed analog signal to the baseband unit.

[0064] The baseband unit 33 converts the analog signal (analog signal) input from the RF unit 32 into a digital signal (digital signal). The baseband unit 33 removes the portion corresponding to the CP (Cyclic Prefix) from the converted digital signal, and for the signal with the CP removed ​ Perform a Fast Fourier Transform (FFT) to extract the signal in the frequency domain.

[0065] The baseband unit 33 performs an Inverse Fast Fourier Transform (IFFT) on the data to generate an OFDM symbol, adds a CP to the generated OFDM symbol to generate a baseband digital signal, and converts the baseband digital signal into an analog signal. The baseband unit 33 outputs the converted analog signal to the RF unit 32.

[0066] The RF unit 32 uses a low-pass filter to remove extra frequency components from the analog signal input from the baseband unit 33, up-converts the analog signal to the carrier frequency (up convert), and transmits it via the antenna unit 31. The RF unit 32 may also have a function of controlling the transmission power. The RF unit 32 is also referred to as a transmission power control unit.

[0067] One or more serving cells (or component carriers, downlink component carriers, uplink component carriers) may be configured for the terminal device 1.

[0068] Each of the serving cells configured for the terminal device 1 may be any one of a PCell (Primary cell), a PSCell (Primary SCG cell), and an SCell (Secondary Cell). primary cell), a PSCell (Primary SCG cell, primary SCG cell), and an SCell (Secondary Cell, secondary cell).

[0069] The PCell is the serving cell included in the MCG (Master Cell Group). The PCell is the cell (the cell where the procedure is performed) in which the terminal device 1 performs the initial connection establishment procedure or the connection re-establishment procedure. (the cell where the procedure is performed).

[0070] The PSCell is the serving cell included in the SCG (Secondary Cell Group). The PSCell is the serving cell in which the random access is performed by the terminal device 1.

[0071] The SCell may be included in either the MCG or the SCG.

[0072] The serving cell group (cell group) is a term that includes at least the MCG and the SCG. The serving cell group may include one or more serving cells (or component carriers). The one or more serving cells (or component carriers) included in the serving cell group may be operated by carrier aggregation.

[0073] One or more downlink BWPs may be set for each of the serving cells (or downlink component carriers). One or more uplink BWPs may be set for each of the serving cells (or uplink component carriers). may be set.

[0074] Among the one or more downlink BWPs set for the serving cell (or downlink component carrier), one downlink BWP may be set as the active downlink BWP (or one downlink BWP may be activated). The (or one downlink BWP may be activated). The Of one or more uplink BWPs configured for a serving cell (or an uplink component carrier), one uplink BWP may be set as the active uplink BWP (or one uplink BWP may be activated).

[0075] PDSCH, PDCCH, and CSI-RS may be received in the active downlink BWP. The terminal device 1 may attempt to receive PDSCH, PDCCH, and CSI-RS in the active downlink BWP. PUCCH and PUSCH may be transmitted in the active uplink BWP. The terminal device 1 may transmit PUCCH and PUSCH in the active uplink BWP. The active downlink BWP and the active uplink BWP are also collectively referred to as the active BWP.

[0076] PDSCH, PDCCH, and CSI-RS may not be received in a downlink BWP other than the active downlink BWP ( inactive downlink BWP). The terminal device 1 may not attempt to receive PDSCH, PDCCH, and CSI-RS in a downlink BWP that is not the active downlink BWP. PUCCH and PUSCH may not be transmitted in an uplink BWP other than the active uplink BWP (inactive uplink BWP). The terminal device 1 may not transmit PUCCH and PUSCH in an uplink BWP that is not the active uplink BWP. The inactive downlink BWP and the inactive uplink BWP are collectively referred to as the inactive BWP. Downlink BWP switching may be from one active

[0077] of a serving cell To deactivate the downlink BWP and activate any of the active downlink BWPs of the serving cell is a procedure. The downlink BWP switching may be controlled by the BWP field included in the downlink control information. The downlink BWP switching may also be controlled based on upper layer parameters. 。The downlink BWP switching may be controlled by the BWP field included in the downlink control information. The downlink BWP switching may also be controlled based on upper layer parameters. Yes.

[0078] The uplink BWP switching is used to deactivate one active uplink BWP and activate any of the inactive uplink BWPs that are not the one active uplink BWP. The uplink BWP switching may be controlled by the BWP field included in the downlink control information. The uplink BWP switching may also be controlled based on upper layer parameters.

[0079] Among one or more downlink BWPs configured for a serving cell, two or more downlink BWPs do not have to be set as active downlink BWPs. For a serving cell, at a certain time, one downlink BWP may be active.

[0080] Among one or more uplink BWPs configured for a serving cell, two or more uplink BWPs do not have to be set as active uplink BWPs. For a serving cell, at a certain time, one uplink BWP may be active.

[0081] FIG. 6 is a schematic block diagram showing a configuration example of the terminal device 1 according to an aspect of the present embodiment. As shown in FIG. 6, the terminal device 1 includes at least one or all of a wireless transmission / reception unit (physical layer processing unit) 10 and an upper layer processing unit 14. The wireless transmission / reception unit 10 includes at least a part or all of an antenna unit 11, an RF unit 12, and a baseband unit 13. The upper layer processing unit 14 includes at least a part or all of a media access control layer processing unit 15 and a radio resource control layer processing unit 16.

[0082] The wireless transmission / reception unit 10 includes at least a part or all of a wireless transmission unit 10a and a wireless reception unit 10b. Here, the device configurations of the baseband unit 13 included in the wireless transmission unit 10a and the baseband unit 13 included in the wireless reception unit 10b may be the same or different. Also, the device configurations of the RF unit 12 included in the wireless transmission unit 10a and the RF unit 12 included in the wireless reception unit 10b may be the same or different. Also, the device configurations of the antenna unit 11 included in the wireless transmission unit 10a and the antenna unit 11 included in the wireless reception unit 10b may be the same or different.

[0083] For example, the wireless transmission unit 10a may generate and transmit a baseband signal of PRACH. For example, the wireless transmission unit 10a may generate and transmit a baseband signal of PUCCH. The wireless transmission unit 10a may generate and transmit a baseband signal of PUSCH. For example, the wireless transmission unit 10a may generate and transmit a baseband signal of PUCCH DMRS. For example, the wireless transmission unit 10a may generate and transmit a baseband signal of PUSCH DMRS. For example, the wireless transmission unit 10a may generate and transmit a baseband signal of UL PTRS. For example, the wireless trans mission unit 10a may generate and transmit a baseband signal of SRS. Generating a baseband signal of SRS may be generating an SRS sequence.

[0084] ​​​For example, the wireless receiving unit 10b may receive and demodulate a PDSCH. For example, the wireless receiving unit 10b may receive and demodulate a PDCCH. For example, the wireless receiving unit 10b may receive and demodulate a PBCH. For example, the wireless receiving unit 10b may receive a synchronization signal. For example, the wireless receiving unit 10b may receive a PDSCH DMRS. For example, the wireless receiving unit 10b may receive a PDCCH DMRS. For example, the wireless receiving unit 10b may receive a CSI-RS. For example, the wireless receiving unit 10b may receive a DL PTRS.

[0085] The upper layer processing unit 14 outputs the uplink data (transport block) to the radio transceiver unit 10 (or the radio transmitter unit 10a). The upper layer processing unit 14 performs processing of the MAC layer, the packet data integration protocol layer, the radio link control layer, and the RRC layer.

[0086] The medium access control layer processing unit 15 included in the upper layer processing unit 14 performs processing of the MAC layer.

[0087] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the RRC layer. The wired resource control layer processing unit 16 processes various setting information / parameters (RRC parameters) of the terminal device 1. The radio resource control layer processing unit 16 manages the RRC message received from the base station device 3. Set RRC parameters based on the message.

[0088] The radio transmission / reception unit 10 (or the radio transmission unit 10a) performs processes such as modulation and encoding. The radio transceiver 10 (or the radio transmitter 10a) modulates, encodes, and transmits uplink data. The radio transmission / reception unit 10 (or the radio transmission unit 10a) generates a physical signal by generating a baseband signal (converting it into a time-continuous signal) and transmits it to the base station device 3. Alternatively, the signal may be arranged in a certain BWP (active uplink BWP) and transmitted to the base station device 3.

[0089] The wireless transceiver unit 10 (or the wireless receiver unit 10b) performs processes such as demodulation and decoding. The wireless transceiver unit 10 (or the wireless receiver unit 30b) may receive a physical signal in a certain BWP (active downlink BWP) of a certain serving cell. The wireless transceiver unit 10 (or also the wireless receiver unit 10b) separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the upper layer processing unit 14. The wireless transceiver unit 10 (wireless receiver unit 10b) may perform a channel access procedure prior to the transmission of the physical signal.

[0090] The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by quadrature demodulation (down convert), and removes unnecessary frequency components. The RF unit 12 outputs the processed analog signal to the baseband unit 13.

[0091] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes the portion corresponding to the CP (Cyclic Prefix) from the converted digital signal, performs a fast Fourier transform (FFT: Fast Fourier Transform) on the signal with the CP removed, and extracts the signal in the frequency domain.

[0092] The baseband unit 13 performs an inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) on the uplink data to generate an OFDM symbol, adds CP to the generated OFDM symbol to generate a baseband digital signal, and converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0093] The RF unit 12 removes unnecessary frequency components from the analog signal input from the baseband unit 13 using a low-pass filter, and up-converts (up convert) the analog signal to the carrier frequency, and transmits it via the antenna unit 11. Further, the RF unit 12 may have a function of controlling the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0094] Hereinafter, the physical signal (signal) will be described.

[0095] The physical signal is a general term for the downlink physical channel, the downlink physical signal, the uplink physical channel, and the uplink physical channel. The physical channel is a general term for the downlink physical channel and the uplink physical channel. The physical signal is a general term for the downlink physical signal and the uplink physical signal.

[0096] The uplink physical channel may correspond to a set of resource elements that transmit information generated in the higher layer. The uplink physical channel may be a physical channel used in the uplink component carrier. The uplink physical channel may be transmitted by the terminal device 1. The uplink physical channel may be received by the base station device 3. In the wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical channels may be used. · PUCCH (Physical Uplink Control CHannel) · PUSCH (Physical Uplink Shared CHannel) · PRACH (Physical Random Access CHannel)

[0097] The PUCCH is used to transmit uplink control information (UCI: Uplink Control Information) It may also be used. The PUCCH may be transmitted to deliver (deliver, transmission, convey) uplink control information. The uplink control information may be mapped to the PUCCH. The terminal device 1 may transmit the PUCCH on which the uplink control information is mapped. The base station device 3 may receive the PUCCH on which the uplink control information is mapped.

[0098] The uplink control information (uplink control information bits, uplink control information sequence, uplink control information type) at least includes part or all of the channel state information (CSI: Channel State Information), scheduling request (SR: Scheduling Request), and HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) information.

[0099] The channel state information is also called channel state information bits or a channel state information sequence. The scheduling request is also called scheduling request bits or a scheduling request sequence. The HARQ-ACK information is also called HARQ-ACK information bits or a HARQ-ACK information sequence.

[0100] The HARQ-ACK information may at least include the HARQ-ACK corresponding to the transport block (TB: Transport block). The HARQ-ACK may indicate the ACK (acknowledgement) or NACK (negative-acknowledgement) corresponding to the transport block. The ACK may indicate that the decoding of the transport block has been successfully completed (has been decoded). The NACK may indicate that the decoding of the transport block has not been successfully completed (has not been decoded). The HARQ-ACK information may include a HARQ-ACK codebook including one or more HARQ-ACK bits.

[0101] A transport block is a sequence of information bits delivered from a higher layer. Here, the sequence of information bits is also referred to as a bit sequence. Here, the transport block may be delivered from the UL-SCH (UpLink - Shared CHannel) of the transport layer.

[0102] One information bit may indicate "0" or "1". The fields included in the DCI format may be composed of one or more information bits. The unit of the number of information bits may be bits. n information bits may represent a value of up to 2 to the power of n.

[0103] There is a case where the HARQ-ACK for a transport block is referred to as the HARQ-ACK for the PDSCH. In this case, "the HARQ-ACK for the PDSCH" indicates the HARQ-ACK for the transport block included in the PDSCH.

[0104] The HARQ-ACK may indicate an ACK or NACK corresponding to one CBG (Code Block Group) included in the transport block.

[0105] The scheduling request may be used at least to request a resource for the UL-SCH for new transmission. The scheduling request bit may be used to indicate either a positive SR or a negative SR. That the scheduling request bit indicates a positive SR is also referred to as "a positive SR is transmitted". The positive SR is for the UL-SCH for new transmission by the terminal device 1. It may indicate that the resource of is requested. A positive SR may indicate that a scheduling request is triggered by the upper layer. A positive SR may be transmitted when a scheduling request is indicated by the upper layer. That the scheduling request bit indicates a negative SR is also referred to as "a negative SR is transmitted". A negative SR may indicate that the terminal device 1 does not request the UL-SCH resource for initial transmission. A negative SR may indicate that a scheduling request is not triggered by the upper layer. A negative SR may be transmitted when a scheduling request is not indicated by the upper layer.

[0106] The channel state information may at least include part or all of a channel quality indicator (CQI), a precoder matrix indicator (PMI), and a rank indicator (RI). The CQI is an indicator related to the quality of the propagation path (e.g., propagation intensity) or the quality of the physical channel, the PMI is an indicator related to the precoder, and the RI is an indicator related to the transmission rank (or the number of transmission layers).

[0107] The channel state information is an indicator related to the reception state of a physical signal (e.g., CSI-RS) that is at least used for channel measurement. The value of the channel state information may be determined by the terminal device 1 based on the reception state assumed by the physical signal that is at least used for channel measurement. The channel measurement may include interference measurement.

[0108] ​The PUCCH may correspond to a PUCCH format. The PUCCH may be a set of resource elements used to transmit a PUCCH format. The PUCCH may include a PUCCH format. The PUCCH may be transmitted with a certain PUCCH format. Note that the PUCCH format may be interpreted as a form of information. Also, the PUCCH format may be interpreted as a set of information set to a certain form of information.

[0109] The PUSCH may be used to transmit one or both of a transport block and uplink control information. The transport block may be arranged on the PUSCH. The transport block delivered by the UL-SCH may be arranged on the PUSCH. The uplink control information may be arranged on the PUSCH. The terminal device 1 may transmit a PUSCH on which one or both of a transport block and uplink control information are arranged. The base station device 3 may receive a PUSCH on which one or both of a transport block and uplink control information are arranged.

[0110] The PRACH may be transmitted to transmit a random access preamble. The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The sequence x (n) of the PRACH is defined by x (n)=x u,v (n)=x u,v (n)=x u (mod(n + C v , L RA ))). Here, x u is a ZC (Zadoff Chu) sequence. Also, x u is x u =exp(-jπui(i + 1) / L RA ) and may be defined thereby. j is an imaginary unit. Also, π is the ratio of a circle's circumference to its diameter. Also, C is defined by C vcorresponds to the cyclic shift of the PRACH sequence. Also, L RA corresponds to the length of the PRACH sequence. Also, L RA is 839 or 139. Also, i is an integer in the range from 0 to L RA - 1 The range of integers. Also, u is a sequence index for the PRACH sequence.

[0111] For each PRACH opportunity, 64 random access preambles are defined. Random access The preamble is determined based on the cyclic shift C of the PRACH sequence v And the sequence index u for the PRACH sequence. Each of the 64 determined random access preambles May be indexed.

[0112] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal may not be used for transmitting information generated in the upper layer. Note that the uplink physical signal may be used for transmitting information generated in the physical layer. The uplink physical signal may be a physical signal used in the uplink component carrier. The terminal device 1 may transmit the uplink physical signal. The base station device 3 may receive the uplink physical signal. In the wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical signals may be used. · UL DMRS (UpLink Demodulation Reference Signal) · SRS (Sounding Reference Signal) · UL PTRS (UpLink Phase Tracking Reference Signal) · UL PTRS (UpLink Phase Tracking Reference Signal)

[0113] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0114] The set of antenna ports of DMRS for PUSCH (DMRS related to PUSCH, DMRS included in PUSCH, DMRS corresponding to PUSCH) may be given based on the set of antenna ports of the PUSCH. For example, the set of antenna ports of DMRS for PUSCH may be the same as the set of antenna ports of the PUSCH.

[0115] The transmission of PUSCH and the transmission of DMRS for the PUSCH may be indicated by one DCI format (or may be scheduled). PUSCH and DMRS for the PUSCH may be collectively referred to as PUSCH. Transmitting PUSCH may mean transmitting PUSCH and DMRS for the PUSCH.

[0116] The propagation path of PUSCH may be estimated from the DMRS for the PUSCH.

[0117] The set of antenna ports of DMRS for PUCCH (DMRS related to PUCCH, DMRS included in PUCCH, DMRS corresponding to PUCCH) may be the same as the set of antenna ports of the PUCCH.

[0118] The transmission of PUCCH and the transmission of DMRS for the PUCCH may be indicated by one DCI format (or may be triggered). The mapping of PUCCH to resource elements (resource element mapping), and the mapping of DMRS for the PUCCH to resource elements One or both of the mappings may be provided by one PUCCH format. The PUCCH and the DMRS for the PUCCH may be collectively referred to as PUCCH. Transmitting the PUCCH may mean transmitting the PUCCH and the DMRS for the PUCCH.

[0119] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0120] The downlink physical channel may correspond to a set of resource elements that transmit information generated at the upper layer. The downlink physical channel may be a physical channel used in the downlink component carrier. The base station device 3 may transmit the downlink physical channel. The terminal device 1 may receive the downlink physical channel. In the wireless communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical channels may be used. ·PBCH (Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·PDSCH (Physical Downlink Shared Channel)

[0121] The PBCH may be transmitted to transmit one or both of the MIB (MIB: Master Information Block) and the physical layer control information. Here, the physical layer control information is information generated at the physical layer. The MIB is a set of parameters arranged in the BCCH (Broadcast Control CHannel), which is a logical channel of the MAC layer. The BCCH is arranged in the BCH, which is a channel of the transport layer. The BCH may be arranged (mapped) to the PBCH. The terminal device 1 may receive the PBCH in which one or both of the MIB and the physical layer control information are arranged. The base station device 3 may transmit the PBCH in which one or both of the MIB and the physical layer control information are arranged.

[0122] For example, the physical layer control information may be composed of 8 bits. The physical layer control information may at least include some or all of the following 0A to 0D. 0A) Radio frame bit 0B) Half radio frame (half system frame, half frame) bit 0C) SS / PBCH block index bit 0D) Subcarrier offset bit

[0123] The radio frame bit is used to indicate the radio frame in which the PBCH is transmitted (the radio frame including the slot in which the PBCH is transmitted). The radio frame bit includes 4 bits. The radio frame bit may be composed of 4 bits out of 10-bit radio frame indicators. For example, the radio frame indicator may be at least used to identify radio frames from index 0 to index 1023.

[0124] The half radio frame bit is used to indicate whether the PBCH is transmitted in the first half of 5 subframes or the second half of 5 subframes of the radio frame in which the PBCH is transmitted. Here, the half radio frame may be composed of including 5 subframes. Also, the half radio frame may be composed of the first half of 5 subframes out of 10 subframes included in the radio frame. Also, the half radio frame may be composed of the second half of 5 subframes out of 10 subframes included in the radio frame.

[0125] The SS / PBCH block index bits are used to indicate the SS / PBCH block index. The SS / PBCH block index bits include 3 bits. The SS / PBCH block index bits may be constituted by 3 bits out of 6-bit SS / PBCH block index indicators. The SS / PBCH block index indicator may be used at least to identify the SS / PBCH blocks from index 0 to index 63.

[0126] The subcarrier offset bits are used to indicate the subcarrier offset. The subcarrier offset may be used to indicate the difference between the first subcarrier to which the PBCH is mapped and the first subcarrier to which the control resource set of index 0 is mapped.

[0127] The PDCCH may be transmitted to transmit downlink control information (DCI: Downlink Control Information). The downlink control information may be arranged (mapped) on the PDCCH. The terminal Device 1 may receive the PDCCH on which the downlink control information is arranged. The base station device 3 may transmit the PDCCH on which the downlink control information is arranged.

[0128] The downlink control information may be transmitted with a DCI format. Note that the DCI format may be interpreted as the format of the downlink control information. Also, the DCI format may be interpreted as a set of downlink control information set to a certain downlink control information format.

[0129] DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format 1_1 are DCI formats. The uplink DCI format is a general term for DCI format 0_0 and DCI format 0_1. The downlink DCI for The DCI format is a general term for DCI format 1_0 and DCI format 1_1.

[0130] DCI format 0_0 is at least used for scheduling PUSCH arranged in a certain cell. DCI format 0_0 is configured to at least include part or all of fields 1A to 1E. 1A) DCI format specific field (Identifier field for DCI formats) 1B) Frequency domain resource assignment field 1C) Time domain resource assignment field 1D) Frequency hopping flag field 1E) MCS field (MCS field: Modulation and Coding Scheme field)

[0131] The DCI format specific field may indicate whether the DCI format including the DCI format specific field is an uplink DCI format or a downlink DCI format. That is, the DCI format specific field may be included in each of the uplink DCI format and the downlink DCI format. Here, the DCI format specific field included in DCI format 0_0 may indicate 0.

[0132] The frequency domain resource assignment field included in DCI format 0_0 may be used to indicate the assignment of frequency resources for PUSCH.

[0133] The time domain resource allocation field included in DCI format 0_0 may be used to indicate the allocation of time resources for PUSCH.

[0134] The frequency hopping flag field may be used to indicate whether frequency hopping is applied to PUSCH. or not.

[0135] The MCS field included in DCI format 0_0 may be used at least to indicate one or both of the modulation method for PUSCH and , one or both of the target coding rates. The target coding rate may be the target coding rate for the transport block arranged on PUSCH. The size (TBS: Transport Block Size) of the transport block arranged on PUSCH may be determined based on one or both of the target coding rate and the modulation method for PUSCH.

[0136] DCI format 0_0 may not include a field used for CSI request (CSI request). That is, the serving cell to which the uplink component carrier on which the PUSCH scheduled by DCI format 0_0 is arranged belongs may be the same as the serving cell of the uplink component carrier on which the PDCCH including the DCI format 0_0 is arranged.

[0137] DCI format 0_0 may not include a carrier indicator field. That is, the serving cell to which the uplink component carrier on which the PUSCH scheduled by DCI format 0_0 is arranged belongs may be the same as the serving cell of the uplink component carrier on which the PDCCH including the DCI format 0_0 is arranged. Terminal device 1 may recognize that the PUSCH scheduled by the DCI format 0_0 is arranged on the uplink component carrier of the serving cell based on detecting the DCI format 0_0 in a downlink component carrier of a certain serving cell. carrier. arrange.

[0138] DCI format 0_0 may not include a BWP field. Here, DCI format 0_0 may be a DCI format that schedules PUSCH without changing the active uplink BWP. The terminal device 1 may recognize that it transmits the PUSCH without switching the active uplink BWP based on detecting DCI format 0_0 used for scheduling the PUSCH. without performing the switching.

[0139] DCI format 0_1 is at least used for scheduling PUSCHs arranged in a certain cell. DCI format 0_1 is configured to at least include part or all of fields 2A to 2H. 2A) DCI format specific field 2B) Frequency domain resource allocation field 2C) Uplink time domain resource allocation field 2D) Frequency hopping flag field 2E) MCS field 2F) CSI request field 2G) BWP field 2H) Carrier indicator field

[0140] The DCI format specific field included in DCI format 0_1 may indicate 0.

[0141] The frequency domain resource allocation field included in DCI format 0_1 may be used to indicate the allocation of frequency resources for PUSCH.

[0142] The time domain resource allocation field included in DCI format 0_1 may be used to indicate the allocation of time resources for PUSCH.

[0143] The MCS field included in DCI format 0_1 may be used at least to indicate the modulation scheme for PUSCH, and / or part or all of the target coding rate.

[0144] The BWP field of DCI format 0_1 may be used to indicate the uplink BWP in which the PUSCH scheduled by the DCI format 0_1 is located. That is, DCI format 0_1 may be accompanied by a change in the active uplink BWP. The terminal device 1 may recognize the uplink BWP in which the PUSCH is located based on detecting the DCI format 0_1 used for scheduling the PUSCH.

[0145] A DCI format 0_1 that does not include a BWP field may be a DCI format for scheduling a PUSCH without changing the active uplink BWP. The terminal device 1 may recognize that it transmits the PUSCH without switching the active uplink BWP based on detecting a DCI format 0_1 that is used for scheduling the PUSCH and does not include a BWP field.

[0146] If the DCI format 0_1 includes a BWP field but the terminal device 1 does not support the function of switching the BWP by the DCI format 0_1, the BWP field may be ignored by the terminal device 1. That is, the terminal device 1 that does not support the function of switching the BWP is a DCI format 0_1 used for scheduling the PUSCH, and the BWP ​​​Based on detecting DCI format 0_1 including a yield, it may be recognized that the PUSCH is transmitted without switching the active uplink BWP. Here, the terminal device 1 When supporting the function of BWP switching, in the function information reporting procedure of the RRC layer, it may report that "the terminal device 1 supports the function of BWP switching".

[0147] The CSI request field is used to indicate the reporting of CSI.

[0148] When the DCI format 0_1 includes a carrier indicator field, the carrier indicator field may be used to indicate the uplink component carrier on which the PUSCH is arranged. When the DCI format 0_1 does not include a carrier indicator field, the uplink component carrier on which the PUSCH is arranged may be the same as the uplink component carrier on which the PDCCH including the DCI format 0_1 used for the scheduling of the PUSCH is arranged. When the number of uplink component carriers set for the terminal device 1 in a certain serving cell group is 2 or more (when carrier aggregation of the uplink is applied in a certain serving cell group), the number of bits of the carrier indicator field included in the DCI format 0_1 used for the scheduling of the PUSCH arranged in the certain serving cell group may be 1 bit or more (for example, 3 bits). When the number of uplink component carriers set for the terminal device 1 in a certain serving cell group is 1 (when carrier aggregation of the uplink is not applied in a certain serving cell group), the scheduling of the PUSCH arranged in the certain serving cell group ... ... ... The carrier indicator field included in DCI format 0_1 used for PUSCH may have 0 bits (or the DCI format 0_1 used for scheduling the PUSCH arranged in a certain serving cell group may not include a carrier indicator field).

[0149] DCI format 1_0 is at least used for scheduling the PDSCH arranged in a certain cell. DCI format 1_0 is configured to at least include a part or all of 3A to 3F as well. 3A) DCI format specific field 3B) Frequency domain resource allocation field 3C) Time domain resource allocation field 3D) MCS field 3E) PDSCH_HARQ feedback timing indicator field 3F) PUCCH resource indicator field

[0150] The DCI format specific field included in DCI format 1_0 may indicate 1.

[0151] The frequency domain resource allocation field included in DCI format 1_0 may be at least used to indicate the allocation of frequency resources for the PDSCH.

[0152] The time domain resource allocation field included in DCI format 1_0 may be at least used to indicate the allocation of time resources for the PDSCH.

[0153] The MCS field (MCS) included in DCI format 1_0 may be used at least to indicate one or both of the modulation scheme for the PDSCH and the target coding rate. The target coding rate may be the target coding rate for the transport block arranged in the PDSCH. The size of the transport block (TBS: Transport Block Size) arranged in the PDSCH may be determined based on one or both of the target coding rate and the modulation scheme for the PDSCH.

[0154] The PDSCH_HARQ feedback timing indication field may be used to indicate the offset from the slot including the last OFDM symbol of the PDSCH to the slot including the first OFDM symbol of the PUCCH.

[0155] The PUCCH resource indication field may be a field indicating the index of any one of one or more PUCCH resources included in the PUCCH resource set. The PUCCH resource set may include one or more PUCCH resources.

[0156] DCI format 1_0 may not include a carrier indicator field. That is, the downlink component carrier where the PDSCH scheduled by DCI format 1_0 is arranged may be the same as the downlink component carrier where the PDCCH including the DCI format 1_0 is arranged. The terminal device 1 may recognize that the PDSCH scheduled by the DCI format 1_0 is arranged in the downlink component carrier based on detecting the DCI format 1_0 in a certain downlink component carrier.

[0157] DCI format 1_0 may not include a BWP field. Here, the DCI format​ DCI format 1_0 may be a DCI format that schedules PDSCH without changing the active downlink link BWP. The terminal device 1 may recognize that it receives the PDSCH without switching the active downlink link BWP based on detecting DCI format 1_0 used for scheduling the PDSCH.

[0158] DCI format 1_1 is at least used for scheduling PDSCH arranged in a certain cell. DCI format 1_1 is configured to include at least a part or all of 4A to 4I. and also included. 4A) DCI format specific field 4B) Frequency domain resource allocation field 4C) Time domain resource allocation field 4E) MCS field 4F) PDSCH_HARQ feedback timing indication field 4G) PUCCH resource indication field 4H) BWP field 4I) Carrier indicator field

[0159] The DCI format specific field included in DCI format 1_1 may indicate 1.

[0160] The frequency domain resource allocation field included in DCI format 1_1 may be at least used to indicate the allocation of frequency resources for PDSCH.

[0161] The time domain resource allocation field included in DCI format 1_1 may be at least used to indicate the allocation of time resources for PDSCH.

[0162] The MCS field (MCS) included in DCI format 1_1 may be used at least to indicate one or both of the modulation scheme for PDSCH and the target coding rate.

[0163] When the DCI format 1_1 includes a PDSCH_HARQ feedback timing indication field, the PDSCH_HARQ feedback timing indication field may be used at least to indicate the offset from the slot including the last OFDM symbol of PDSCH to the slot including the first OFDM symbol of PUCCH. When the DCI format 1_1 does not include a PDSCH_HARQ feedback timing indication field, the offset from the slot including the last OFDM symbol of PDSCH to the slot including the first OFDM symbol of PUCCH may be specified by a higher layer parameter.

[0164] The PUCCH resource indication field may be a field indicating the index of any one of one or more PUCCH resources included in the PUCCH resource set.

[0165] The BWP field of DCI format 1_1 may be used to indicate the downlink BWP in which the PDSCH scheduled by the DCI format 1_1 is located. That is, the DCI format 1_1 may be accompanied by a change in the active downlink BWP. The terminal device 1 may recognize the downlink BWP in which the PUSCH is located based on detecting the DCI format 1_1 used for scheduling the PDSCH.

[0166] A DCI format 1_1 that does not include a BWP field does not change the active downlink BWP It may also be a DCI format that schedules PDSCH without [accompanying conditions]. The terminal device 1 may recognize that it receives the PDSCH without switching the active downlink BWP based on detecting a DCI format 1_1 that is used for scheduling the PDSCH and does not include a BWP field.

[0167] Although the DCI format 1_1 includes a BWP field, if the terminal device 1 does not support the function of switching the BWP by the DCI format 1_1, the BWP field may be ignored by the terminal device 1. That is, the terminal device 1 that does not support the function of switching the BWP , may recognize that it receives the PDSCH without switching the active downlink BWP based on detecting a DCI format 1_1 that is used for scheduling the PDSCH and includes a BWP field. Here, when the terminal device 1 supports the function of switching the BWP, in the function information reporting procedure of the RRC layer, it may report that "the terminal device 1 supports the function of switching the BWP".

[0168] When the DCI format 1_1 includes a carrier indicator field, the carrier indicator field may be used to indicate the downlink component carrier where the PDSCH is located. When the DCI format 1_1 does not include a carrier indicator field, the downlink component carrier where the PDSCH is located is the one where the PDCCH including the DCI format 1_1 used for scheduling the PDSCH is located ​It may be the same as the downlink component carrier. When the number of downlink component carriers set for the terminal device 1 in a serving cell group is 2 or more (when carrier aggregation of the downlink is applied in a serving cell group), the carrier indicator field included in DCI format 1_1 used for the scheduling of the PDSCH arranged in the serving cell group The number of bits may be 1 bit or more (for example, 3 bits). When the number of downlink component carriers set for the terminal device 1 in a serving cell group is 1 (when carrier aggregation of the downlink is not applied in a serving cell group), the scheduling of the PDSCH arranged in the serving cell group The number of bits of the carrier indicator field included in DCI format 1_1 used for May be 0 bits (or the DCI format 1_1 used for the scheduling of the PDSCH arranged in the serving cell group may not include a carrier indicator field). The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block delivered from the DL-SCH. The PDSCH may be used to transmit a transport block. The transport block may be arranged in the PDSCH. The transport block corresponding to the DL-SCH may be arranged in the PDSCH. The base station device 3 may transmit the PDSCH. The terminal device 1 may receive the PDSCH.

[0169]

[0170] ​The downlink physical signal may correspond to a set of resource elements. The downlink physical signal may not carry information generated in the upper layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The downlink physical signal may be transmitted by the base station device 3. The downlink physical signal may be transmitted by the terminal device 1. In the wireless communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical signals may be used. · Synchronization signal (SS: Synchronization signal) · DL DMRS (DownLink DeModulation Reference Signal) · CSI-RS (Channel State Information-Reference Signal) · DL PTRS (DownLink Phase Tracking Reference Signal)

[0171] The synchronization signal may be used for the terminal device 1 to synchronize with one or both of the downlink frequency domain and time domain. The synchronization signal is a general term for PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0172] FIG. 7 is a diagram showing a configuration example of an SS / PBCH block according to one aspect of the present embodiment. In FIG. 7, the horizontal axis is the time axis (OFDM symbol index l sym ), and the vertical axis indicates the frequency domain. Also, block 700 indicates a set of resource elements for PSS. Also, block 720 indicates a set of resource elements for SSS. Also, the four blocks Cluster (blocks 710, 711, 712, and 713) indicates a set of resource elements for PBCH and for DMRS for the PBCH (DMRS related to PBCH, DMRS included in PBCH, DMRS corresponding to PBCH).

[0173] As shown in Figure 7, the SS / PBCH block includes PSS, SSS, and PBCH. Also, the SS / PBCH block includes four consecutive OFDM symbols. The SS / PBCH block includes 240 subcarriers. PSS is arranged in subcarriers 57 to 183 in the first OFDM symbol. SSS is arranged in subcarriers 57 to 183 in the third OFDM symbol. The first 56 subcarriers in the first OFDM symbol may be set to zero. The subcarriers 184 to 240 in the first OFDM symbol may be set to zero. The subcarriers 49 to 56 in the third OFDM symbol may be set to zero. The subcarriers 184 to 192 in the third OFDM symbol may be set to zero. PBCH is arranged in the subcarriers from 1 to 240 in the second OFDM symbol where DMRS for PBCH is not arranged. PBCH is arranged in the subcarriers from 1 to 48 in the third OFDM symbol where DMRS for PBCH is not arranged. PBCH is arranged in the subcarriers from 193 to 240 in the third OFDM symbol where DMRS for PBCH is not arranged. PBCH is arranged in the subcarriers from 1 to 240 in the fourth OFDM symbol where DMRS for PBCH is not arranged. in the third OFDM symbol. th subcarriers. The first 56 subcarriers in the first OFDM symbol may be set to zero. The subcarriers 184 to 240 in the first OFDM symbol may be set to zero. The subcarriers 49 to 56 in the third OFDM symbol may be set to zero. The subcarriers 184 to 192 in the third OFDM symbol may be set to zero. PBCH is arranged in the subcarriers from 1 to 240 in the second OFDM symbol where DMRS for PBCH is not arranged. PBCH is arranged in the subcarriers from 1 to 48 in the third OFDM symbol where DMRS for PBCH is not arranged. PBCH is arranged in the subcarriers from 193 to 240 in the third OFDM symbol where DMRS for PBCH is not arranged. PBCH is arranged in the subcarriers from 1 to 240 in the fourth OFDM symbol where DMRS for PBCH is not arranged.

[0174] The antenna ports of PSS, SSS, PBCH, and DMRS for PBCH may be the same.

[0175] The PBCH on which a PBCH symbol is transmitted at a certain antenna port may be estimated by the DMRS for the PBCH that is placed in the slot to which the PBCH is mapped and is included in the SS / PBCH block to which the PBCH is included.

[0176] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0177] A set of antenna ports of DMRS for PDSCH (DMRS related to PDSCH, DMRS included in PDSCH, DMRS corresponding to PDSCH) may be given based on the set of antenna ports for the PDSCH, i.e., the set of antenna ports of DMRS for PDSCH may be the same as the set of antenna ports for the PDSCH.

[0178] The transmission of the PDSCH and the transmission of the DMRS for the PDSCH are indicated by one DCI format. The PDSCH and the DMRS for the PDSCH may be collectively referred to as a PDSCH. Transmitting a PDSCH may be transmitting a PDSCH and a DMRS for the PDSCH.

[0179] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. A set of resource elements on which a DMRS symbol is transmitted and the symbol of the DMRS for the PDSCH are transmitted. In a case where a set of resource elements on which a symbol of a PDSCH is transmitted is included in the same precoding resource group (PRG), the PDSCH on which a symbol of the PDSCH is transmitted in a certain antenna port may be estimated by the DMRS for the PDSCH.

[0180] The antenna port of the DMRS for PDCCH (DMRS related to PDCCH, DMRS included in PDCCH, DMRS corresponding to PDCCH) may be the same as the antenna port for PDCCH.

[0181] The PDCCH may be estimated from the DMRS for the PDCCH. That is, the propagation path of the PDCCH may be estimated from the DMRS for the PDCCH. If, for a certain PDCCH symbol, the set of resource elements through which it is transmitted and the set of resource elements through which the symbol of the DMRS for the certain PDCCH is transmitted apply the same precoder (assumed to be applied, assume to be applied), the PDCCH symbol transmitted at a certain antenna port may be estimated by the DMRS for the PDCCH.

[0182] BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel), and DL-SCH (Downlink-Shared CHannel) are transport channels. The transport channel defines the relationship between the physical layer channel and the MAC layer channel (also referred to as the logical channel).

[0183] The BCH at the transport layer is mapped to the PBCH at the physical layer. That is, the transport block passing through the BCH at the transport layer is delivered to the PBCH at the physical layer. Also, the UL-SCH at the transport layer is mapped to the PUSCH at the physical layer. That is, the transport block passing through the UL-SCH at the transport layer is delivered to the PUSCH at the physical layer. Also, the DL-SCH at the transport layer is mapped to the PDSCH at the physical layer. That is, the transport block passing through the DL-SCH at the transport layer is delivered to the PDSCH at the physical layer.

[0184] ​For each serving cell, one UL-SCH and one DL-SCH may be provided. The BCH may be provided for the PCell. The BCH may not be provided for the PSCell or SCell.

[0185] In the MAC layer, HARQ (Hybrid Automatic Repeat reQuest) control is performed for each transport block.

[0186] BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH is a channel of the RRC layer used to transmit the MIB or system information. Also, the CCCH (Common Control CHannel) may be used to transmit common RRC messages in a plurality of terminal devices 1. Here, the CCCH may be used, for example, for a terminal device 1 that is not RRC-connected. Also, the DCCH (Dedicated Control CHannel) may be used at least to transmit dedicated RRC messages to the terminal device 1. Here, the DCCH may be used, for example, for a terminal device 1 that is RRC-connected.

[0187] Common upper layer parameters in a plurality of terminal devices 1 are also referred to as common upper layer parameters. Here, the common upper layer parameters may be defined as parameters specific to the serving cell. Here, the parameters specific to the serving cell may be parameters common to the terminal devices (for example, terminal devices 1-A, B, C) in which the serving cell is set. It may be a parameter.

[0188] For example, the common upper layer parameters may be included in the RRC message delivered to the BCCH. For example, the common upper layer parameters may be included in the RRC message delivered to the DCCH. 。

[0189] Among certain upper layer parameters, upper layer parameters different from the common upper layer parameters are also referred to as dedicated upper layer parameters. Here, the dedicated upper layer parameters can provide dedicated RRC parameters for the terminal device 1-A where the serving cell is set. That is, the dedicated RRC parameters are upper layer parameters that can provide unique settings for each of the terminal devices 1-A, B, and C.

[0190] The BCCH of the logical channel is mapped to the BCH of the transport layer or the DL-SCH. For example, the transport block containing the MIB information is delivered to the BCH of the transport layer. Also, the transport block containing system information other than the MIB is delivered to the DL-SCH of the transport layer. Also, the CCCH is mapped to the DL-SCH or the UL-SCH. That is, the transport block mapped to the CCCH is delivered to the DL-SCH or the UL-SCH. Also, the DCCH is mapped to the DL-SCH or the UL-SCH. That is, the transport block mapped to the DCCH is delivered to the DL-SCH or the UL-SCH.

[0191] The RRC message contains one or more parameters managed in the RRC layer. Here, the parameters managed in the RRC layer are also referred to as RRC parameters. For example, the RRC message may contain the MIB. Also, the RRC message may contain system information. Also, the RRC message may contain a message corresponding to the CCCH. Also, the RRC message may contain a message corresponding to the DCCH. The RRC message containing a message corresponding to the DCCH is also referred to as an individual RRC message.

[0192] The upper layer parameters (parameters of the upper layer) are RRC parameters or parameters included in the MAC CE (Medium Access Control Control Element). That is, the upper layer parameters are a general term for MIB, system information, messages corresponding to CCCH, messages corresponding to DCCH, and parameters included in the MAC CE. The parameters included in the MAC CE are transmitted by MAC CE (Control Element) commands.

[0193] The procedures performed by the terminal device 1 include at least a part or all of the following 5A to 5C. 5A) Cell search 5B) Random access 5C) Data communication

[0194] Cell search is a procedure used by the terminal device 1 to synchronize with a certain cell regarding the time domain and the frequency domain and detect the physical cell identity. That is, the terminal device 1 may perform synchronization in the time domain and the frequency domain with a certain cell and detect the physical cell identity by cell search.

[0195] The sequence of the PSS is given based at least on the physical cell identity. The sequence of the SSS is given based at least on the physical cell identity.

[0196] The SS / PBCH block candidates indicate the resources where the transmission of the SS / PBCH block is permitted (possible, reserved, set, defined, likely).

[0197] The set of SS / PBCH block candidates in a certain half radio frame is also called an SS burst set. The SS burst set is a transmission window (transmission It is also referred to as a window, an SS transmission window, or a Discovery Reference Signal transmission window. An SS burst set is a general term that includes at least a first SS burst set and a second SS burst set.

[0198] The base station device 3 transmits one or more indexes of SS / PBCH blocks at a predetermined period. The terminal device 1 may detect at least one of the SS / PBCH blocks of the one or more indexes of SS / PBCH blocks and attempt to decode the PBCH included in the SS / PBCH block.

[0199] Random access is a procedure that includes at least a part or all of Message 1, Message 2, Message 3, and Message 4.

[0200] Message 1 is a procedure in which the terminal device 1 transmits a PRACH. The terminal device 1 transmits a PRACH in one PRACH opportunity selected from one or more PRACH opportunities based at least on the index of the SS / PBCH block candidate detected based on cell search. Each of the PRACH opportunities is defined based at least on resources in the time domain and the frequency domain.

[0201] The terminal device 1 transmits one random access preamble selected from the PRACH opportunities corresponding to the indexes of the SS / PBCH block candidates where the SS / PBCH block is detected.

[0202] ​​Message 2 is a procedure for attempting to detect DCI format 1_0 with a CRC (Cyclic Redundancy Check) scrambled by a RA-RNTI (Random Access - Radio Network Temporary Identifier) by the terminal device 1. The terminal device 1 attempts to detect a PDCCH including the DCI format in a control resource set given based on the MIB included in the PBCH included in the SS / PBCH block detected based on cell search, and in a resource indicated based on the setting of a search area set. Message 2 is also referred to as a random access response.

[0203] Message 3 is a procedure for transmitting a PUSCH scheduled by a random access response grant included in the DCI format 1_0 detected by the Message 2 procedure. Here, the random access response grant is indicated by a MAC CE included in a PDSCH scheduled by the DCI format 1_0. The PUSCH scheduled based on the random access response grant is either a Message 3 PUSCH or a PUSCH. The Message 3 PUSCH includes a contention resolution identifier MAC CE. The contention resolution identifier MAC CE includes a contention resolution identifier. The retransmission of the Message 3 PUSCH is scheduled by a DCI format 0_0 with a CRC scrambled based on a TC-RNTI (Temporary Cell - Radio Network Temporary Identifier). The PUSCH scheduled based on the random access response grant is either a Message 3 PUSCH or a PUSCH. The Message 3 PUSCH includes a contention resolution identifier MAC CE. The contention resolution identifier MAC CE includes a contention resolution identifier.

[0204] The PUSCH scheduled based on the random access response grant is either a Message 3 PUSCH or a PUSCH. The Message 3 PUSCH includes a contention resolution identifier MAC CE. The contention resolution identifier MAC CE includes a contention resolution identifier. The PUSCH scheduled based on the random access response grant is either a Message 3 PUSCH or a PUSCH. The Message 3 PUSCH includes a contention resolution identifier MAC CE. The contention resolution identifier MAC CE includes a contention resolution identifier. The PUSCH scheduled based on the random access response grant is either a Message 3 PUSCH or a PUSCH. The Message 3 PUSCH includes a contention resolution identifier MAC CE. The contention resolution identifier MAC CE includes a contention resolution identifier.

[0205] The retransmission of the Message 3 PUSCH is scheduled by a DCI format 0_0 with a CRC scrambled based on a TC-RNTI (Temporary Cell - Radio Network Temporary Identifier).

[0206] Message 4 is a procedure for attempting to detect DCI format 1_0 with a CRC scrambled based on either a C-RNTI (Cell - Radio Network Temporary Identifier) or a TC-RNTI. The terminal device 1 receives a PDSCH scheduled based on the DCI format 1_0. The PDSCH may include a collision resolution ID. The PDSCH is received. The PDSCH may include a collision resolution ID.

[0207] Data communication is a general term for downlink communication and uplink communication.

[0208] In data communication, the terminal device 1 attempts to detect a PDCCH (monitor a PDCCH, monitor a PDCCH) in a resource specified based on a control resource set and a search space set. The PDCCH is monitored.

[0209] The control resource set is a set of resources composed of a predetermined number of resource blocks and a predetermined number of OFDM symbols. In the frequency domain, the control resource set may be composed of continuous resources (non-interleaved mapping) or may be composed of dispersed resources (interleaver mapping). The control resource set may be composed of dispersed resources (interleaver mapping).

[0210] The set of resource blocks constituting the control resource set may be indicated by a higher layer parameter. The number of OFDM symbols constituting the control resource set may be indicated by a higher layer parameter.

[0211] The terminal device 1 attempts to detect a PDCCH in the search space set. Here, attempting to detect a PDCCH in the search space set may mean attempting to detect a PDCCH candidate in the search space set, or may mean attempting to detect a DCI format in the search space set, or may mean attempting to detect a PDCCH in the control resource set. Here, attempting to detect a PDCCH in the search space set may mean attempting to detect a PDCCH candidate in the search space set, or may mean attempting to detect a DCI format in the search space set, or may mean attempting to detect a PDCCH in the control resource set. or may mean attempting to detect a PDCCH in the control resource set. Alternatively, it may be to attempt to detect PDCCH candidates in a control resource set or to attempt to detect a DCI format in a control resource set.

[0212] The search space set is defined as a set of PDCCH candidates. The search space set may be a CSS (Common Search Space) set or a USS (UE-specific Search Space) set. The terminal device 1 attempts to detect PDCCH candidates in part or all of a Type 0 PDCCH common search space set, a Type 0a PDCCH common search space set, a Type 1 PDCCH common search space set, a Type 2 PDCCH common search space set, a Type 3 PDCCH common search space set, and / or a UE-specific PDCCH search space set.

[0213] The Type 0 PDCCH common search space set may be used as the common search space set with index 0 or may be the common search space set with index 0.

[0214] The CSS set is a general term for the Type 0 PDCCH common search space set, the Type 0a PDCCH common search space set, the Type 1 PDCCH common search space set, the Type 2 PDCCH common search space set, and the Type 3 PDCCH common search space set. The USS set is also referred to as the UE-specific PDCCH search space set.

[0215] ​ A search area set is related to (includes, corresponds to) a certain control resource set. The index of the control resource set related to the search area set may be indicated by a higher layer parameter.

[0216] For a certain search area set, some or all of 6A to 6C may be indicated by at least a higher layer parameter. 6A) PDCCH monitoring periodicity 6B) PDCCH monitoring pattern within a slot 6C) PDCCH monitoring offset

[0217] The monitoring occasion of a certain search area set is for the OFDM symbol in which the first OFDM symbol of the control resource set related to the certain search area set is located. The monitoring occasion of a certain search area set may correspond to the resources of the control resource set starting from the first OFDM symbol of the control resource set related to the certain search area set. The monitoring occasion of the search area set is given based on at least some or all of the PDCCH monitoring periodicity, the PDCCH monitoring pattern within a slot, and the PDCCH monitoring offset.

[0218] FIG. 8 is a diagram showing an example of the monitoring occasion of a search area set according to an aspect of the present embodiment. In FIG. 8, a search area set 91 and a search area set 92 are set for the primary cell 301, a search area set 93 is set for the secondary cell 302, and a search area set 94 is set for the secondary cell 303.

[0219] ​In FIG. 8, the white single-color blocks in the primary cell 301 indicate the search area set 91, the black single-color blocks in the primary cell 301 indicate the search area set 92, the blocks in the secondary cell 302 indicate the search area set 93, and the blocks in the secondary cell 303 indicate the search area set 94.

[0220] The monitoring interval of the search area set 91 is set to 1 slot, and the monitoring offset of the search area set 91 is set to 0 slots, and the monitoring pattern of the search area set 91 is set to [1,0 ,0,0,0,0,0,1,0,0,0,0,0,0]. That is, the monitoring opportunities of the search area set 91 correspond to the first OFDM symbol (OFDM symbol #0) and the eighth OFDM symbol (OFDM symbol #7) in each slot.

[0221] The monitoring interval of the search area set 92 is set to 2 slots, the monitoring offset of the search area set 92 is set to 0 slots, and the monitoring pattern of the search area set 92 is set to [1,0 ,0,0,0,0,0,0,0,0,0,0,0,0]. That is, the monitoring opportunities of the search area set 92 correspond to the first OFDM symbol (OFDM symbol #0) in each even slot.

[0222] The monitoring interval of the search area set 93 is set to 2 slots, the monitoring offset of the search area set 93 is set to 0 slots, and the monitoring pattern of the search area set 93 is set to [0,0 ,0,0,0,0,0,1,0,0,0,0,0,0]. That is, the monitoring opportunities of the search area set 93 correspond to the eighth OFDM symbol (OFDM symbol #7) in each even slot.

[0223] The monitoring interval of the search area set 94 is set to 2 slots, the monitoring offset of the search area set 94 is set to 1 slot, and the monitoring pattern of the search area set 94 is [1,0 ,0,0,0,0,0,0,0,0,0,0,0,0] is set. That is, the monitoring opportunity of the search area set 94 corresponds to the first OFDM symbol (OF DM symbol #0) in each of the odd slots.

[0224] The type 0 PDCCH common search area set may be used at least for DCI formats with CRC (Cyclic Redundancy Check) sequences scrambled by SI-RNTI (System Information-Radio Network Temporary Identifier).

[0225] The type 0a PDCCH common search area set may be used at least for DCI formats with CRC (Cyclic Redundancy Check) sequences scrambled by SI-RNTI (System Information-Radio Network Temporary Identifier).

[0226] The type 1 PDCCH common search area set may be used at least for DCI formats with CRC sequences scrambled by RA-RNTI (Random Access-Radio Network Temporary Identifier) and / or CRC sequences scrambled by TC-RNTI (Temporary Cell-Radio Network Temporary Identifier).

[0227] The Type 2 PDCCH common search space set may be used for DCI formats with a CRC sequence scrambled by a P-RNTI (Paging - Radio Network Temporary Identifier).

[0228] The Type 3 PDCCH common search space set may be used for DCI formats with a CRC sequence scrambled by a C-RNTI (Cell-Radio Network Temporary Identifier).

[0229] The UE-specific PDCCH search space set may be used at least for DCI formats with a CRC sequence scrambled by a C-RNTI.

[0230] In downlink communication, the terminal device 1 detects a downlink DCI format. The detected downlink DCI format is used at least for resource allocation of the PDSCH. The detected downlink DCI format is also referred to as a downlink assignment. The terminal device 1 attempts to receive the PDSCH. Based on the PUCCH resources indicated based on the detected downlink DCI format, the terminal device reports the HARQ-ACK corresponding to the PDSCH (the HARQ-ACK corresponding to the transport block included in the PDSCH) to the base station device 3.

[0231] In uplink communication, the terminal device 1 detects an uplink DCI format. The detected DCI format is used at least for resource allocation of the PUSCH. The detected uplink DCI format is also referred to as an uplink grant. The terminal device 1 transmits the PUSCH.

[0232] ​​​In a configured grant, the uplink grant for scheduling the PUSCH is configured for each transmission period of the PUSCH. When the PUSCH is scheduled by an uplink DCI format, some or all of the information indicated by the uplink DCI format may be indicated by the uplink grant configured in the case of the configured grant. When the PUSCH is scheduled by an uplink DCI format, some or all of the information indicated by the uplink DCI format may be indicated by the uplink grant configured in the case of the configured grant.

[0233] A UL slot may be a slot composed of UL symbols. A special slot may be a slot composed of UL symbols, flexible symbols, and DL symbols. A DL slot may be a slot composed of DL symbols.

[0234] A UL symbol may be an OFDM symbol configured or indicated for the uplink in time-division duplexing. The UL symbol may be an OFDM symbol configured or indicated for the PUSCH, or the PUCCH, the PRACH, or the SRS. The UL symbol may be provided by the upper layer parameter tdd-UL-DL-ConfigurationCommon. The UL symbol may be provided by the upper layer parameter tdd-UL-DL-ConfigurationDedicated. The UL symbol may be provided by the upper layer parameter tdd-UL-DL-ConfigurationCommon. The UL symbol may be provided by the upper layer parameter tdd-UL-DL-ConfigurationDedicated. A UL slot may be provided by the upper layer parameter tdd-UL-DL-ConfigurationCommon. A UL slot may be provided by the upper layer parameter tdd-UL-DL-ConfigurationDedicated. The UL symbol may be provided by the upper layer parameter tdd-UL-DL-ConfigurationCommon. A UL slot may be provided by the upper layer parameter tdd-UL-DL-ConfigurationCommon. A UL slot may be provided by the upper layer parameter tdd-UL-DL-ConfigurationDedicated. The UL symbol may be provided by the upper layer parameter tdd-UL-DL-ConfigurationDedicated.

[0235] The DL symbol may be an OFDM symbol configured or indicated for the downlink in time-division multiplexing. The DL symbol may be an OFDM symbol configured or indicated for the PDSCH or PDCCH. The DL symbol may be provided by the higher layer parameter tdd-UL-DL-ConfigurationCommon. The DL symbol may be provided by the higher layer parameter tdd-UL-DL-ConfigurationDedicated. The DL slot may be provided by the higher layer parameter tdd-UL-DL-ConfigurationCommon. The DL slot may be provided by the higher layer parameter tdd-UL-DL-ConfigurationDedicated.

[0236] The flexible symbol may be an OFDM symbol within a certain period that is not configured or indicated as a UL symbol or a DL symbol. The certain period may be the period given by the higher layer parameter dl-UL-TransmissionPeriodicity. The flexible symbol may be an OFDM symbol configured or indicated for the PDSCH, PDCCH, PUSCH, PUCCH, or PRACH.

[0237] ​The upper layer parameter tdd-UL-DL-ConfigurationCommon may be a parameter for setting either a UL slot, a DL slot, or a special slot for each of one or more slots. The upper layer parameter tdd-UL-DL-ConfigurationDedicated may be a parameter for setting either a UL symbol, a DL symbol, or a flexible symbol for the flexible symbols in each of the one or more slots. tdd-UL-DL-ConfigurationCommon may be a common upper layer parameter. tdd-UL-DL-ConfigurationDedicated may be a dedicated upper layer parameter.

[0238] PUSCH-Config may be a dedicated upper layer parameter. PUSCH-ConfigCommon may be a common upper layer parameter. PUSCH-Config may be set for each BWP for PUSCH transmission and may be. PUSCH-Config may include a plurality of upper layer parameters related to PUSCH transmission. PUSCH-Config may be UE-specific settings. For example, PUSCH-Config for terminal devices 1A, 1B, and 1C in one cell, or a plurality of upper layer parameters included in PUSCH-Config may be different. PUSCH-ConfigCommon may be set for each BWP for PUSCH transmission. PUSCH-ConfigCommon may include a plurality of upper layer parameters related to PUSCH transmission. PUSCH-ConfigCommon may be cell-specific settings. For example, PUSCH-ConfigCommon for terminal devices 1A, 1B, and 1C in one cell may be common. For example, PUSCH-ConfigCommon may be given by system information.

[0239] The terminal device 1 may decode the PDSCH. For example, the terminal device 1 may decode the corresponding PDSCH in response to the detection of the PDCCH. In transmission method 1 of the PDSCH, the terminal device 1 may assume that the transmission by the base station device 3 is performed in the PDSCH. The transmission by the base station device 3 in the PDSCH may be performed with a maximum of 8 transmission layers from antenna port 1000 to 1011. The transmission by the base station device 3 in the PDSCH may be performed from antenna port 1000 to 1023. The transmission by the base station device 3 in the PDSCH may be performed with a maximum of 8 transmission layers from antenna port 1000 to 1023.

[0240] The PDSCH may be scheduled by the PDCCH. The DMRS reception procedure for the first PDSCH scheduled by the PDCCH with DCI format 1_1 may be applied to the second PDSCH. The second PDSCH may be a PDSCH scheduled by the PDCCH with DCI format 1_2. The second PDSCH may be a PDSCH scheduled by the PDCCH with DCI format 4_2.

[0241] As assumption 1, the terminal device 1 may assume that there is no PDSCH in the OFDM symbol that transmits the DMRS. As assumption 2, the terminal device 1 may assume that there is no PDSCH in the OFDM symbol that transmits the DMRS. It may be assumed that there is no PDSCH other than the first PDSCH. The first PDSCH may be a PDSCH with an allocation period of 2 OFDM symbols. As assumption 3, the terminal device 1 may assume that single symbol front-loaded DMRS of set type 1 is transmitted at DMRS port 1000. As assumption 4, the terminal device 1 may assume that the remaining antenna ports other than DMRS port 1000 are not related to PDSCH transmission to other terminal devices. As assumption 5, the terminal device 1 may assume that the upper layer parameter dmrs-AdditionalPosition is 'pos2' and that there are at most two additional single-symbol DMRSs in one slot. The terminal device 1 may assume assumption 5 for PDSCHs of mapping type A and mapping type B. As assumption 6, the terminal device 1 may assume that the PDSCH exists in the symbol that transmits the DMRS. The terminal device 1 may assume assumption 6 for a PDSCH that is of mapping type B and has an allocation period of 2 OFDM symbols.

[0242] The PDSCH may be scheduled by a DCI format. When the PDSCH is scheduled by the first DCI format, or when the PDSCH is received before any dedicated higher layer configuration of one or more upper layer parameters, the terminal device 1 may assume some or all of assumption 1, assumption 2, assumption 3, assumption 4, assumption 5, and assumption 6. The first DCI format may be DCI format 1_0, DCI format 4_0, or DCI format 4_1. The one or more upper layer parameters may be some or all of the upper layer parameter dmrs-AdditionalPosition, the upper layer parameter maxLength, and the upper layer parameter dmrs-Type.

[0243] When the PDSCH is scheduled by the second DCI format, the terminal device 1 may have the upper layer parameter dmrs-Type set, and the set DMRS setting type (setting type) may be used for the received PDSCH. When the PDSCH is scheduled by the second DCI format, the maximum number of front DMRS symbols for the PDSCH may be set by the upper layer parameter maxLength given by the upper layer parameter DMRS-DownlinkConfig. The upper layer parameter maxLength may be set to 'len1' or 'len2'. The DMRS may be scheduled by DCI (DCI format). When the upper layer parameter maxLength is set to 'len1', the single-symbol DMRS (front DMRS of a single symbol) may be scheduled for the terminal device 1 by DCI (DCI format). When the upper layer parameter maxLength is set to 'len1', the terminal device 1 may set the additional DMRS (Additional DMRS) for the PDSCH according to the upper layer parameter dmrs-AdditionalPosition with 'pos0', 'pos1', 'pos2', or 'pos3' set. When the upper layer parameter maxLength is set to 'len2', the single-symbol DMRS and the double-symbol DMRS (front DMRS of double symbols) may be scheduled for the terminal device 1 by DCI. When the upper layer parameter maxLength is set to 'len2', the additional DMRS (Additional DMRS) for the PDSCH may be set according to the upper layer parameter dmrs-AdditionalPosition with 'pos0' or 'pos1' set. The terminal device 1 may assume to receive the additional DMRS. The second DCI format may be DCI format 1_1 with a PDCCH with a CRC scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI.The second DCI format may be DCI format 4_2 by means of a PDCCH accompanied by a CRC scrambled by a G-RNTI or a G-CS-RNTI.

[0244] The reference signal may be a generic term for DMRS, PTRS, and CSI-RS. For the reference signal specific to the terminal device, one or two scrambling identities may be set by the upper layer for the terminal device 1. The scrambling identity may be the same for both PDSCH mapping type A and PDSCH mapping type B. The terminal device 1 may be scheduled on several DMRS ports. The terminal device 1 may be scheduled on several DMRS ports according to the antenna port index (antenna port number) in DCI format 1_1.

[0245] In the case of DMRS configuration type 1, in the first case, the second case, or the third case, the terminal device 1 may assume that one or more antenna ports are not associated with PDSCH transmission to other terminal devices. In the first case, the terminal device 1 may be scheduled with one codeword and assigned to an antenna port mapped to any index in {2, 9, 10, 11, 30} (the value of the antenna port field). In the second case, the terminal device 1 may be scheduled with one codeword and assigned to an antenna port mapped to any index in {2, 9, 10, 11, 12} (the value of the antenna port field). In the third case, the terminal device 1 may be scheduled with two codes. One or more antenna ports may be the remaining orthogonal antenna ports. In the first case, the terminal device 1 may be scheduled with one codeword and assigned to an antenna port mapped to the index in {2, 9, 10, 11, 30} (the value of the antenna port field) when DMRS extension is not applied. In the first case, the terminal device 1 may be scheduled with one codeword and assigned to an antenna port mapped to the index in {2, 9, 10, 11, 18, 19, 20} (the value of the antenna port field) when DMRS extension is applied and the upper layer parameter maxLength is 1. In the first case, it may be determined based on whether DMRS extension is applied. In the first case, it may be determined based on whether DMRS extension is applied and the upper layer parameter maxLength.

[0246] The application of DMRS extension may be that the upper layer parameter ExtendedDMRSports is set. It may be. The application of DMRS extension may be that the upper layer parameter ExtendedDMRSports is It may also be effectively set. When the terminal device 1 reports a certain capability , DMRS extension may be applied. When the terminal device 1 does not report the relevant capability , DMRS extension may not be applied. When the terminal device 1 does not report the relevant capability, the terminal device 1 may not expect that DMRS extension will be applied. For example, the relevant capability may be reported for one or both of the uplink and the downlink. For example, the upper layer parameter ExtendedDMRSports may be set for one or both of the uplink and the downlink. For example, the upper layer parameter ExtendedDMRSports may be set in the upper layer parameter DMRS-DownlinkConfig, and may also be set in the upper layer parameter DMRS-UplinkConfig.

[0247] Whether DMRS demodulation assistance is applied may be indicated by the DCI format. For example, whether DMRS demodulation assistance is applied may be indicated by one or both of DCI format 1_1 and DCI format 1_2. For example, whether DMRS demodulation assistance is applied may be indicated by one or both of DCI format 0_1 and DCI format 0_2.

[0248] In the case of DMRS configuration type 2, in the fourth case, the fifth case, or the third case, the terminal device 1 may assume that one or more antenna ports are not related to PDSCH transmission to other terminal devices. In the fourth case, it may be that the terminal device 1 is scheduled with one codeword and is allocated to an antenna port mapped to any of the indexes {2, 10, 23} (DMRS port, DMRS port index). In the fifth case, it may be that the terminal device 1 is scheduled with one codeword and is allocated to an antenna port mapped to any of the indexes {2, 10, 23, 58} (DMRS port, DMRS port index).

[0249] When the terminal device 1 that receives the PDSCH scheduled by the first DCI format is set with the first upper layer parameter, the terminal device 1 has the first setting and the second The configuration may be assumed not to occur simultaneously for the received PDSCH. The first DCI format may be DCI format 1_2. The first DCI format may be DCI format 1_0 or DCI format 1_1. The first upper layer parameter may be the upper layer parameter phaseTrackingRS in the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeA-DCI-1-2. The first upper layer parameter may be the upper layer parameter phaseTrackingRS in the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeB-DCI-1-2. The first upper layer parameter may be the upper layer parameter phaseTrackingRS in the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeA. The first upper layer parameter may be the upper layer parameter phaseTrackingRS in the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeB. The first configuration may be that one or more DMRS ports are scheduled for terminal device 1 and other terminal devices share DMRS resource elements in the same CDM group. The one or more DMRS ports may be one or more DMRS ports among 1004 to 1007. The one or more DMRS ports may be one or more DMRS ports among 1006 to 1011. In DMRS configuration type 1, the one or more DMRS ports may be one or more DMRS ports among DMRS port 1004 to DMRS port 1007. In DMRS configuration type 2, the one or more DMRS ports may be one or more DMRS ports among DMRS port 1006 to DMRS port 1011. In DMRS configuration type 1, the one or more DMRS ports may be one or more DMRS ports among DMRS port 1004 to DMRS port 1007 and DMRS port 1012 to DMRS port 1015.In DMRS configuration type 2, one or more DMRS ports may be one or more DMRS ports among DMRS ports 1006 to 1011 and DMRS ports 1018 to 1023. When DMRS configuration type 1 is set and DMRS extension is applied, one or more DMRS ports may be one or more DMRS ports among DMRS ports 1004 to 1007 and DMRS ports 1012 to 1015. When DMRS configuration type 2 is set and DMRS extension is applied, one or more DMRS ports may be one or more DMRS ports among DMRS ports 1006 to 1011 and DMRS ports 1018 to 1023. The second configuration may be that PTRS is transmitted to terminal device 1. The application of DMRS extension may be that the upper layer parameter ExtendedDMRSports is set. The application of DMRS extension may be that the upper layer parameter ExtendedDMRSports is effectively set.

[0250] Terminal device 1 does not necessarily need to expect that the front DMRS of double symbols (front DMRS symbol of double symbols) and two or more additional DMRSs (additional DMRS symbols) are set simultaneously. The setting of the front DMRS of double symbols may be set by the upper layer parameter maxLength with 'len2' set, where the maximum number of front DMRS symbols for PDSCH is set. The additional DMRS may be given by the upper layer parameter dmrs-AdditionalPosition.

[0251] The terminal device 1 may not be expected to assume a DMRS setting different from that of co-scheduled UE(s). The DMRS setting may be related to the actual number of front DMRS symbols, the actual number of additional DMRSs, the DMRS symbol position, and the DMRS setting type.

[0252] When a PDSCH scheduled by DCI format 1_1 is received, the terminal device 1 may assume that the indicated CDM group includes potential co-scheduled downlink terminal devices (co-scheduled UE(s), co-scheduled downlink terminal devices) and that the indicated CDM group is not used for data transmission. The "1", "2", and "3" for the number of DMRS-CDM groups (CDM groups) may respectively correspond to CDM group 0, CDM group {0, 1}, and CDM group {0, 1, 2}.

[0253] The terminal device 1 may assume that the number of DMRS-CDM groups (CDM groups) without data is 1. For example, when a PDSCH scheduled by DCI format 1_0, 4_0, or 4_1 is received, the terminal device 1 may assume that the number of the first CDM group without data is 1. The first CDM group may correspond to CDM group 0 for a PDSCH with an allocation period of 2 OFDM symbols. The terminal device 1 may assume that the number of DMRS-CDM groups without data is 2. For example, when a PDSCH scheduled by DCI format 1_0, 4_0, or 4_1 is received, the terminal device 1 may assume that the number of the second CDM group without data is 2. The second CDM group may correspond to CDM group {0, 1} for a PDSCH other than a PDSCH with an allocation period of 2 OFDM symbols.

[0254] The terminal device 1 does not have to expect to receive the first PDSCH. The first PDSCH may be scheduled by DCI indicating a CDM group with DMRS ports overlapping with the configured CSI-RS resources.

[0255] The terminal device 1 may receive DMRS for the PDSCH. When the terminal device 1 receives DMRS for the PDSCH and the SS / PBCH block in one or more OFDM symbols, the terminal device 1 may assume that the DMRS and the SS / PBCH block are QCL (or Type D QCL). The terminal device 1 does not have to expect to receive DMRS in one or more second resource elements overlapping with one or more first resource elements of the SS / PBCH block. The terminal device 1 may expect that different or the same subcarrier spacings are set for the SS / PBCH block and the DMRS in one component carrier. For example, when the first subcarrier spacing of the SS / PBCH block is 240 kHz, the terminal device 1 may expect that the second subcarrier spacing for the DMRS is different from the first subcarrier spacing.

[0256] When at least one TCI code point indicates two TCI states, and when the terminal device 1 receives DMRS for the PDSCH and the SS / PBCH block in the same OFDM symbol, the terminal device 1 may assume that at least one DMRS port for the PDSCH and the SS / PBCH block are QCL (or Type D QCL).

[0257] When the terminal device 1 is set by the upper layer parameter PDCCH-Config, and when the terminal device 1 receives DMRS for the PDSCH and the SS / PBCH block in the same OFDM symbol, ​​​​It may be assumed that Set 1 is QCL for at least one DMRS port for PDSCH and the SS / PBCH block (also is QCL of Type D). The upper layer parameter PDCCH-Config may include two different values of the upper layer parameter coresetPoolIndex in the upper layer parameter ControlResourceSet.

[0258] When the terminal device 1 is configured with the upper layer parameter PDCCH-Config including two different values of the upper layer parameter coresetPoolIndex, the terminal device 1 may be scheduled by a plurality of PDSCHs that overlap in the time domain and the frequency domain by a plurality of PDCCHs. In this case the terminal device 1 may not be expected to assume different DMRS settings. Also, in this case, the terminal device 1 may not be expected to assume the DMRS ports in one CDM group indicated by two TCI (Transmission Configuration Indication) states. The DMRS setting may be a DMRS setting regarding the actual number of front DMRS symbols, the actual number of additional DMRS symbols, the actual DMRS symbol positions, and part or all of the DMRS setting type.

[0259] ​When the terminal device 1 is instructed by DCI including a time domain resource allocation field that indicates an entry including the upper layer parameter repetitionNumber in the upper layer parameter PDSCH-TimeDomainResourceAllocation, the terminal device 1 may not be set by the upper layer parameter sfnSchemePdsch. In this case, two TCI states at the code point of the TCI field may be indicated, and DMRS ports within two CDM groups in the antenna port field may be indicated. In this case, the first TCI state may correspond to the first CDM group of the first antenna port, and the second TCI state may correspond to the second CDM group. The first antenna port may be indicated by an Antenna port indication table. The DCI (DCI format) may be configured to include a TCI field (Transmission Configuration Indication field). The DCI (DCI format) may be configured to include an antenna port field (Antenna port field).

[0260] The procedure in PTRS reception may be applied to the terminal device 1 that receives the PDSCH scheduled by the first DCI format. The first DCI format may be DCI format 1_2 when the upper layer parameter phaseTrackingRS is set in the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeA-DCI-1-2, or the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeB-DCI-1-2. The first DCI format may be DCI format 1_0, or DCI format 1_1 when the upper layer parameter phaseTrackingRS is set in the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeA, or the upper layer parameter dmrs-DownlinkForPDSCH-MappingTypeB.

[0261] The terminal device 1 may also report the MCS and the bandwidth threshold. For example, based on the UE capability at a specific carrier frequency, the MCS and the bandwidth threshold may be reported. For example, at each sub - carrier frequency applied to the data channel at a specific carrier frequency, assuming the MCS table with the maximum modulation order, the MCS and the bandwidth threshold may be reported. The MCS may be used at least to indicate the modulation method and part or all of the target coding rate.

[0262] When the upper - layer parameter phaseTrackingRS in the upper - layer parameter DMRS - DownlinkConfig is set for the terminal device 1, part or all of operation 1, operation 2, operation 3, and operation 4 may be performed, indicated, assumed, or determined.

[0263] As operation 1, the upper - layer parameter timeDensity and the upper - layer parameter frequencyDensity may each indicate three MCS threshold values and two RB threshold values.

[0264] As operation 2, when one or both of the upper - layer parameter timeDensity and the upper - layer parameter frequencyDensity are set, the terminal device 1 may assume the existence of the PTRS antenna port (PTRS port), and assume that the pattern is a function of the first MCS and the first bandwidth. As operation 2, for the additional upper - layer parameter timeDensity and the upper - layer parameter freq When one or both of uencyDensity are set, and the RNTI is MCS-C-RNTI, C-RNTI, or CS-RNTI, the terminal device 1 may assume that the presence and pattern of the PTRS antenna port (PTRS port) are a function of the first MCS and the first bandwidth. The first MCS may be the MCS of the corresponding codeword. The first bandwidth may be the bandwidth in the corresponding BWP (bandwidth part). When the upper layer parameter timeDensity is not set, the terminal device 1 may assume that L PTRS is 1. L PTRS may be the number of OFDM symbols between two OFDM symbols to which the PTRS is mapped. For example, L PTRS PTRS may exist in one of the OFDM symbols of the OFDM symbols of. When the upper layer parameter frequencyDensity is not set, the terminal device may assume that K PTRS is 2. K PTRS is the number of PRBs between two PRBs to which the PTRS is mapped may be. For example, K PTRS PTRS may exist in one of the PRBs of the PRBs of as well.

[0265] As operation 3, when neither the upper layer parameter timeDensity nor the upper layer parameter frequencyDensity is set, the terminal device 1 may assume that L PTRS is 1 and K PTRS is 2. As operation 3, when neither the additional upper layer parameter timeDensity nor the upper layer parameter frequencyDensity is set, and the RNTI is MCS-C-RNTI, C-RNTI, or CS-RNTI, and condition 1 is not satisfied, the terminal device 1 may assume that L PTRS is 1 and K PTRSAs 2, it may be assumed that PTRS exists. As operation 3, when neither the additional upper layer parameter timeDensity nor the upper layer parameter frequencyDensity is set, and when the RNTI is MCS-C-RNTI, C-RNTI, or CS-RNTI, and when condition 1 is satisfied, the terminal device 1 may assume that PTRS does not exist. Condition 1 may be that the value of MCS is less than 10. Condition 1 may be that the value of MCS is less than 5. Condition 1 may be that the value of MCS is less than 15. Condition 1 may be that the value of MCS is less than 3. Condition 1 may be that the number of PRB (RB) is less than 3.

[0266] As operation 4, when the RNTI is RA-RNTI, SI-RNTI, MSGB-RNTI, or P-RNTI, the terminal device 1 may assume that PTRS does not exist.

[0267] The first MCS threshold, the second MCS threshold, and the third MCS threshold may be determined by upper layer parameters. When the value of MCS is less than the first MCS threshold, PTRS may not exist. When the value of MCS is greater than or equal to the first MCS threshold and less than the second MCS threshold, L PTRS may be 4 When the value of MCS is greater than or equal to the second MCS threshold and less than the third MCS threshold, L PTRS may be 2. When the value of MCS is at least greater than or equal to the third MCS threshold, L PTRS may be 1 When the first MCS table is used, the upper layer parameters may provide the first MCS threshold, the second MCS threshold, and the third MCS threshold in the range from 0 to 29. When the second MCS table is used, the upper layer parameters may provide the first MCS threshold, the second MCS A threshold value and a third MCS threshold value may be provided. When the third MCS table is used, the upper layer parameter may provide the first MCS threshold value, the second MCS threshold value, and the third MCS threshold value in the range from 0 to 27. The value of MCS may not exceed a fourth MCS threshold value. The fourth MCS threshold value may be 29 when the first MCS table is used, 28 when the second MCS table is used, and 27 when the third MCS table is used .

[0268] The first RB threshold value and the second RB threshold value may be determined by an upper layer parameter. When the number of RBs is less than the first RB threshold value, PTRS may not exist. When the number of RBs is greater than or equal to the first RB threshold value and less than the second RB threshold value, K PTRS may be 2. When the number of RBs is at least greater than or equal to the second RB threshold value, K PTRS may be 4. The upper layer parameter may provide the first RB threshold value and the second RB threshold value in the range from 1 to 276.

[0269] When the upper layer parameter phaseTrackingRS is not set, the terminal device 1 may assume that there is no PTRS . The PTRS time density (L PTRS ) and / or the PTRS frequency density (K PTRS ) may indicate that there is no PTRS.

[0270] L PTRS is 2 or 4, and when a PDSCH with an allocation period of 2 OFDM symbols is received, it may be assumed that no PTRS is transmitted. When L PTRS is 4, and when a PDSCH with an allocation period of 4 OFDM symbols is received, it may be assumed that no PTRS is transmitted .

[0271] The value of MCS for determining the time density of PTRS may be obtained from DCI. For example, when the terminal device 1 is scheduled with an MCS index (value of MCS) greater than the first value, and when a PDSCH for retransmission is received, the value of MCS for determining the time density (L ) of PTRS may be obtained from the DCI received for the same transport in the initial transmission. The first value may be 28 when the first MCS table is used, 27 when the second MCS table is used, and 26 when the third MCS table is used, PTRS etc.

[0272] One or more DMRS ports may be associated with one PTRS port. One or more DMRS ports associated with one PTRS port may be assumed to be QCL (or QCL of type A and type D). When the terminal device 1 is scheduled with one codeword , the PTRS antenna port (PTRS port, antenna port for PTRS, antenna port related to PTRS) may be associated with one of the one or more DMRS antenna ports (DMRS port, antenna port for DMRS) assigned for the PDSCH. One DMRS antenna port may be the lowest-indexed DMRS antenna port. The DMRS port may be a downlink DMRS port. The PTRS port may be a PTRS antenna port. The PTRS port may be an antenna port for PTRS. The DMRS port may be a DMRS antenna port. The DMRS port may be an antenna port for DMRS.

[0273] When the terminal device 1 is scheduled with two codewords, the PTRS antenna port may be associated with one DMRS antenna port. One DMRS antenna port may be the highest MCS​​​ Of the one or more DMRS antenna ports assigned for the codeword with It may be the lowest-indexed DMRS antenna port. For two codewords If they have the same MCS (MCS index), one DMRS antenna port may be the lowest-indexed DMRS antenna port among the one or more DMRS antenna ports assigned for codeword 0.

[0274] DCI format 1_0, DCI format 1_1, and DCI format 1_2 may be DCI formats for PDSCH scheduling. DCI format 1_0 may be used for PDSCH scheduling in one downlink cell.

[0275] The Antenna port(s) field may be included in DCI format 1_1 and DCI format 1_2. The number of information bits constituting the Antenna port(s) field may be 4, 5, or 6 bits. Also, the number of information bits constituting the Antenna port(s) field may be 4, 5, 6, or 7 bits. Also, the number of information bits constituting the Antenna port(s) field may be 4, 5, 6, 7, or 8 bits. The number of CDM groups without data may be any of value 1, value 2, and value 3. The number of CDM groups without data of value 1 may refer to CDM group 0. The number of CDM groups without data of value 2 may refer to CDM groups {0, 1}. The number of CDM groups without data of value 3 may refer to CDM groups {0, 1, 2}.

[0276] That the upper layer parameter dmrs-Type is 1 means that DMRS configuration type 1 is configured It may also be so. The fact that the upper layer parameter dmrs-Type is 2 may mean that the DMRS setting type 2 is set. It may also be so. The fact that the upper layer parameter maxLength is 1 may mean that the maximum number of leading DMRS symbols is 1 symbol. The fact that the upper layer parameter maxLength is 2 may mean that the maximum number of leading DMRS symbols is 2 symbols. For example, the fact that the upper layer parameter maxLength is 1 may mean that the single-symbol leading DMRS (leading DMRS symbol) is set. For example, the fact that the upper layer parameter maxLength is 2 may mean that the single-symbol leading DMRS (leading DMRS symbol), or the double-symbol leading DMRS is set.

[0277] When DMRS setting type 1 and the single-symbol leading DMRS symbol are set, The number of information bits constituting the antenna port field may be 4. When DMRS configuration type 1 and the front DMRS symbol of a single symbol are configured, and when the upper layer parameter ExtendedDMRSports is not configured, the number of information bits constituting the antenna port field may be 4. When DMRS configuration type 1 and the front DMRS symbol of a single symbol are configured, and when it is configured that the upper layer parameter ExtendedDMRSports is invalid, the number of information bits constituting the antenna port field may be 4. When the value of the antenna port field composed of 4 information bits is 0, the DMRS port may be 0, and the number of CDM groups without data may be 1. When the value of the antenna port field composed of 4 information bits is 1, the DMRS port may be 1, and the number of CDM groups without data may be 1. When the value of the antenna port field composed of 4 information bits is 2, the DMRS port may be {0,1}, and the number of CDM groups without data may be 1. When the value of the antenna port field composed of 4 information bits is 3, the DMRS port may be 0, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 4, the DMRS port may be 1, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 5, the DMRS port may be 2, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 6, the DMRS port may be 3, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 7, the DMRS port may be {0,1}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 8, the DMRS port may be {2,3}, and the number of CDM groups without data may be 2.When the value of the antenna port field composed of 4 information bits is 9, the DMRS ports may be {0, 1, 2}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 10, the DMRS ports may be {0, 1, 2, 3}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 11, the DMRS ports may be {0, 2}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 4 information bits is 12, 13, 14, or 15, the DMRS ports may be undefined (reserved), and the number of CDM groups without data may be undefined (reserved).

[0278] For DMRS configuration type 1 and when a single-symbol pre-DMRS symbol is configured, and when the upper layer parameter ExtendedDMRSports is configured, the number of information bits constituting the antenna port field may be 5. For DMRS configuration type 1 and when a single-symbol pre-DMRS symbol is configured, and when it is configured that the upper layer parameter ExtendedDMRSports is valid, the number of information bits constituting the antenna port field may be 5. When the value of the antenna port field composed of 5 information bits is 0 , the DMRS port may be 0, and the number of CDM groups without data may be 1 too. When the value of the antenna port field composed of 5 information bits is 1, the DMRS port may be 1, and the number of CDM groups without data may be 1. When the value of the antenna port field composed of 5 information bits is 2, the DMRS ports may be {0, 1}, and the number of CDM groups without data may be 1. When the value of the antenna port field composed of 5 information bits is When the value of the antenna port field to be formed is 3, the DMRS port may be 0, and the number of CDM groups without data may be 2. The antenna is composed of five information bits When the value of the naport field is 4, the DMRS port may be 1, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 5, the DMRS port may be 2, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 6, the DMRS port may be 3, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 7, the DMRS port may be {0,1}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 8, the DMRS port may be {2,3}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 9, the DMRS port may be {0,1,2}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 10, the DMRS port may be {0,1,2,3}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 11, the DMRS port may be {0,2}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 12, the DMRS port may be 8, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 13, the DMRS port may be 9, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 14, the DMRS port may be 10, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 15, the DMRS port may be 11, and the number of CDM groups without data may be 2.When the value of the antenna port field composed of 5 information bits is 16, the DMRS port may be {8, 9}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 17, the DMRS port may be {10, 11}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 18, the DMRS port may be {8, 9, 10}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits is 19, the DMRS port may be {8, 9, 10, 11}, and the number of CDM groups without data may be 2. When the value of the antenna port field composed of 5 information bits indicates some or all of the DMRS ports {8, 9, 10, 11}, the number of CDM groups without data may be 2.

[0279] When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2, the number of information bits constituting the antenna port field may be 5. When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2, and when the upper layer parameter ExtendedDMRSports is not configured, the number of information bits constituting the antenna port field may be 5. When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2 and when the upper layer parameter ExtendedDMRSports is configured to be invalid, the number of information bits constituting the antenna port field may be 5. The antenna port field composed of 5 information bits may indicate some or all of the DMRS ports {0, 1, 2, 3, 4, 5, 6, 7}.

[0280] ​When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2, the number of information bits constituting the antenna port field may be 5. When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2, and when the upper layer parameter ExtendedDMRSports is not configured, the number of information bits constituting the antenna port field may be 5. When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2 and when the upper layer parameter ExtendedDMRSports is configured to be invalid, an antenna port field constituted by 5 information bits may indicate some or all of the DMRS ports {0, 1, 2, 3, 4, 5, 6, 7}. It may also indicate.

[0281] When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2, and when the upper layer parameter ExtendedDMRSports is configured, an antenna port field constituted by 6 information bits may be 6. When DMRS configuration type 1 is configured and the maximum number of front DMRS symbols is configured to be 2, and furthermore, when the upper layer parameter ExtendedDMRSports is configured to be valid, the antenna port field constituted by 6 information bits may be 6. The antenna port field constituted by 6 information bits may indicate some or all of the DMRS ports {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}. When the value of the antenna port field constituted by 6 information bits indicates some or all of the DMRS ports {8, 9, 10, 11, 12, 13, 14, 15}, the number of CDM groups without data may be 2.

[0282] In the case of DMRS configuration type 1, the antenna ports (DMRS ports) that become available by applying DMRS extension may correspond to two CDM groups without data. DMRS configuration In the case of type 1, the antenna ports (DMRS ports) that become available by applying DMRS extension do not have to correspond to one CDM group without data.

[0283] When DMRS configuration type 2 is configured and when the maximum number of front DMRS symbols is set to 1, the number of information bits constituting the antenna port field may be 5. When DMRS configuration type 2 is configured and when the maximum number of front DMRS symbols is set to 1, and when the upper layer parameter ExtendedDMRSports is not configured, the number of information bits constituting the antenna port field may be 5. When DMRS configuration type 2 is configured and when the maximum number of front DMRS symbols is set to 1 and when the upper layer parameter ExtendedDMRSports is set to be invalid, the number of information bits constituting the an tenna port field may be 5. The antenna port field composed of five information bits may indicate some or all of the DMRS ports {0, 1, 2, 3, 4, 5}. It may indicate.

[0284] When DMRS configuration type 2 is configured and when the maximum number of front DMRS symbols is set to 1, and when the upper layer parameter ExtendedDMRSports is configured, the an tenna port field may be composed of six information bits. When DMRS configuration type 2 is configured and when the maximum number of front DMRS symbols is set to 1, and when Second, when it is set that the upper layer parameter ExtendedDMRSports is valid, the antenna The number of information bits constituting the port field may be 6. The antenna port field composed of 6 information bits is part of the DMRS ports {0, 1, 2, 3, 4, 5, 12, 13, 14, 15, 16, 17} Or all of them may be indicated. The antenna port field composed of 6 information bits If the value indicates part or all of the DMRS ports {12, 13, 14, 15, 16, 17}, the number of CDM groups without data may be one or both of 2 and 3, and may not be 1.

[0285] When DMRS setting type 2 is set and the maximum number of front DMRS symbols is set to 2 Is set, the number of information bits constituting the antenna port field may be 6 Yes. When DMRS setting type 2 is set and the maximum number of front DMRS symbols is set to 2, and when the upper layer parameter ExtendedDMRSports is not set, The number of information bits constituting the antenna port field may be 6. When DMRS setting type 2 is set and the maximum number of front DMRS symbols is set to 2 And when it is set that the upper layer parameter ExtendedDMRSports is invalid, the an The number of information bits constituting the tenna port field may be 6. The antenna port field composed of 6 information bits is part of the DMRS ports {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11} Or all of them may be indicated.

[0286] When DMRS setting type 2 is set and the maximum number of front DMRS symbols is set to 2, and when the upper layer parameter ExtendedDMRSports is set, the an The number of information bits constituting the antenna port field may be 7. When DMRS configuration type 2 is configured and when the maximum number of front DMRS symbols is configured to be 2, and furthermore, when the upper layer parameter ExtendedDMRSports is configured to be valid, the antenna port field may be constituted by 7 information bits. The antenna port field constituted by 7 information bits may indicate some or all of the DMRS ports {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23}. When the value of the antenna port field constituted by 7 information bits indicates some or all of the DMRS ports {12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23}, the number of CDM groups without data may be one or both of 2 and 3, and may not be 1.

[0287] In the case of DMRS configuration type 2, the antenna ports (DMRS ports) made available by applying DMRS extension may correspond to the number of CDM groups without data being 3. DMRS configuration In the case of type 1, the antenna ports (DMRS ports) made available by applying DMRS extension do not have to correspond to the number of CDM groups without data being 1. In the case of DMRS configuration type 1, the antenna ports (DMRS ports) made available by applying DMRS extension do not have to correspond to the number of CDM groups without data being 2.

[0288] When DMRS configuration type 1 is set, and when the maximum number of front DMRS symbols is set to 1, and when the upper layer parameter ExtendedDMRSports is set, the number of information bits constituting the antenna port field may be 6. When DMRS configuration type 1 is set, and when the maximum number of front DMRS symbols is set to 1, and when the upper layer parameter ExtendedDMRSports is set to be valid, the number of information bits constituting the antenna port field may be 6. The first part of the antenna port field composed of 6 information bits may be used to indicate the DMRS port, and the second part of the antenna port field composed of 6 information bits may be used for DMRS reception assistance.

[0289] When DMRS configuration type 1 is set, and when the maximum number of front DMRS symbols is set to 2, and when the upper layer parameter ExtendedDMRSports is set, an tenna port field may be composed of 7 information bits. When DMRS configuration type 1 is set, and when the maximum number of front DMRS symbols is set to 2, and if the upper layer parameter ExtendedDMRSports is set to be valid, the antenna port field may be composed of 7 information bits. The antenna port field composed of 7 information bits may indicate some or all of the DMRS ports {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}. When the value of the antenna port field composed of 7 information bits indicates some or all of the DMRS ports {8, 9, 10, 11, 12, 13, 14, 15}, the number of CDM groups without data may be 2. The first part of the antenna port field composed of 7 information bits may be used to indicate the DMRS port, and the second part of the antenna port field composed of 7 information bits may be used for DMRS reception assistance.

[0290] When DMRS configuration type 2 is configured, and when the maximum number of front DMRS symbols is set to 1, and when the upper layer parameter ExtendedDMRSports is configured, the number of information bits constituting the antenna port field may be 7. When DMRS configuration type 2 is configured, and when the maximum number of front DMRS symbols is set to 1, and moreover, when the upper layer parameter ExtendedDMRSports is set to be valid, the number of information bits constituting the antenna port field may be 7. The antenna port field composed of 7 information bits may indicate part or all of the DMRS ports {0, 1, 2, 3, 4, 5, 12, 13, 14, 15, 16, 17}. Moreover, the antenna port field composed of 7 information bits When the value indicates part or all of the DMRS ports {12, 13, 14, 15, 16, 17}, the number of CDM groups without data may be 2. The first part of the antenna port field composed of 7 information bits may be used to indicate the DMRS ports, and the second part of the antenna port field composed of 7 information bits may be used for DMRS reception assistance.

[0291] When DMRS configuration type 2 is configured, and when the maximum number of front DMRS symbols is set to 2, and when the upper layer parameter ExtendedDMRSports is configured, the number of information bits constituting the antenna port field may be 8. When DMRS configuration type 2 is configured, and when the maximum number of front DMRS symbols is set to 2, and moreover, when the upper layer parameter ExtendedDMRSports is set to be valid, the The number of information bits constituting the port field may be 8. The antenna port field composed of 8 information bits may indicate some or all of the DMRS ports {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23}. When the value of the antenna port field composed of 8 information bits indicates some or all of the DMRS ports {12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23}, the number of CDM groups without data may be 2. The first part of the antenna port field composed of 8 information bits may be used to indicate the DMRS port, and the second part of the antenna port field composed of 7 information bits may be used for DMRS reception assistance.

[0292] The number of DMRS ports may be the number of layers v. The antenna ports {p0,..., p v-1}(the value of the antenna port, the antenna port number) may be the sum of the DMRS port (the value of the DMRS port, the DMRS port number) and 1000. For example, DMRS port 0 may correspond to antenna port p0 = 1000 as well. For example, DMRS port 1 may correspond to antenna port p1 = 1001. For example, DMRS ports {0, 1} may correspond to antenna ports {p0 = 1000, p1 = 1001}. For example, DMRS ports {2, 3} may correspond to antenna ports {p2 = 1002, p3 = 1003}.

[0293] The DMRS for PDSCH may be determined based on the DMRS sequence (DMRS sequence) and the mapping to the physical resources. The DMRS sequence for PDSCH may be generated. The DMRS sequence r(n) may be determined based at least on the pseudo-random sequence c(i). The pseudo-random sequence generator is the OFDM symbol number l within the slot and the slot within the frame in the frame Slot number (slot index) n μ s,f and N nn ID and nn = n λ SCID may be initialized based at least in part on some or all of. When nn = 0, N 0 ID may be given by the upper layer parameter scrablingID0. When nn = 1, N 1 ID may be given by the upper layer parameter ID1. N nn ID is the cell ID N cell ID (Physical layer cell identity). When the upper layer parameter dmrs-Downlink or the upper layer parameter dmrs-Uplink is provided and λ = 0, n 0 SCID may be n SCID When the upper layer parameter dmrs-Downlink or the upper layer parameter dmrs-Uplink is provided and λ = 2, n 2 SCID may be n SCID When the upper layer parameter dmrs-Downlink or the upper layer parameter dmrs-Uplink is provided and λ = 1, n 1 SCID may be 1 - n SCID λ may be a CDM group. When the upper layer parameter dmrs-Downlink or the upper layer parameter dmrs-Uplink is not provided, n λ SCID may be n SCID When the upper layer parameter dmrs-Downlink or the upper layer parameter dmrs-Uplink is not provided, λ may be 0. n When the upper layer parameter dmrs-Downlink or the upper layer parameter dmrs-Uplink is not provided, λ may be 0. n SCID may be 0 or 1. n SCIDmay be provided by a DMRS sequence initialization field in DCI. If there is no DMRS sequence initialization field in DCI, n SCID may be 0.

[0294] DMRS for PDSCH (PDSCH-DMRS) may be mapped to physical resources according to the DMRS configuration type. The DMRS configuration type may be DMRS configuration type 1 (configuration type 1), or DMRS configuration type 2 (configuration type 2). The sequence r(m) of DMRS may be mapped to one or more resource elements (k, l) (or a p,μ ) and may also be mapped to a set of resource elements (k, l) (p,μ) (k,l) . The sequence r(m) of DMRS may be mapped to a set of resource elements (k, l) p,μ and may be scaled by a factor β to match the transmission power. One or more resource elements (k, l) DMRS PDSCH may be determined based on the subcarrier index (subcarrier) k, the OFDM symbol index (OFDM symbol) l, the antenna port p, and the subcarrier spacing setting (subcarrier p,μ spacing) μ. The reference point of the subcarrier index k may be the subcarrier of index 0 in the common resource block 0 of index 0. The reference point of the subcarrier index k may be the subcarrier of index 0 in the lowest-numbered resource block in CORESET0.

[0295] The reference point of the OFDM symbol index l may be, in PDSCH mapping type A, the slot in which the PDSCH mapping type A starts, and may also be the OFDM symbol number 0 in the first slot in which the PDSCH mapping type A starts.

[0296] in which the PDSCH mapping type A starts, and may also be the OFDM symbol number 0 in the first slot in which the PDSCH mapping type A starts. It may be determined in relation to the start of. The reference point of the OFDM symbol index l may be determined in relation to the start of the scheduled PDSCH resource in PDSCH mapping type B. In the case of PDSCH mapping type A and when the upper layer parameter dmrs-TypeA-Position is 'pos3', the position l0 of the first DMRS symbol may be 3. PDSCH ma pping type A, and when the upper layer parameter dmrs-TypeA-Position is 'pos2', the position l0 of the first DMRS symbol may be 2. In PDSCH mapping type B , the position l0 of the first DMRS symbol may be 0.

[0297] The sequence r(n) of DMRS may be mapped to the physical resource a (p,μ) (k,l) . The sequence r(n) of DMRS may be mapped to the physical resource a based on Equation 1 (p,μ) (k,l) . [Number]

[0298] k' may be {0, 1}. k' may be determined based on DMRS reception assistance. For example when the information bits in the DCI format for DMRS reception assistance do not indicate a specific value , k' may be {0, 1}. Also, when the information bits in the DCI format for DMRS reception assistance indicate a specific value, k' may be {0, 1, 2, 3}. For example, when the upper layer parameter ExtendedDMRSports is not set, k' may be {0, 1}. When the upper layer para meter ExtendedDMRSports is set, k' may be {0, 1, 2, 3}. For example, up When the higher layer parameter ExtendedDMRSports is set and DMRS reception assistance is applied in this case, k’ may be {0, 1, 2, 3}. For example, when the higher layer parameter ExtendedDMRSports is set and DMRS reception assistance is not applied, k’ may be {0, 1}. Whether DMRS reception assistance is applied may be determined based on the DCI format. Some of the information bits in a specific field of the DCI format may determine whether DMRS reception assistance is applied. The specific field may be the antenna port field. k’ may be referred to as the Frequency domain-Orthogonal Cover code index (FD-OCC index). The fact that k’ is {0, 1} may mean that the FD-OCC length is 2. The fact that k’ is {0, 1, 2, 3} may mean that the FD-OCC length is 4.

[0299] When k’ is {0, 1} in DMRS configuration type 1, k’ may be {0, 1} in DMRS configuration type 2. When k’ is {0, 1, 2, 3} in DMRS configuration type 1, k’ may be {0, 1, 2, 3} in DMRS configuration type 2.

[0300] The OFDM symbol index l may be l bar + l’.

[0301] In PDSCH mapping type A, ld may be the period between the first OFDM symbol of the slot and the last OFDM symbol of the scheduled PDSCH resource in the slot as well. In PDSCH mapping type B, ld may be the period of the scheduled PDSCH resource as well.

[0302] DMRS position l bar is for the single-symbol DMRS (front DMRS of a single symbol). bar It may be so. The DMRS position l bar may be determined based at least on the period ld. For example, the DMRS position l bar may be determined based at least on the period ld, the PDSCH mapping type, and the additional DMRS. For example, when the period ld is 2 OFDM symbols, the DMRS position l bar may be l0. For example, when the period ld is any one of 3 to 7 OFDM symbols and the PDSCH mapping type A is set, l bar may be l0. For example, when the period ld is any one of 2 to 4 OFDM symbols and the PDSCH mapping type B is set, l bar may be l0. For example, when ld is 14 OFDM symbols , and the PDSCH mapping type A is set, and 'pos0' is set in dmrs-AdditionalPosition , the DMRS position l bar may be l0. For example, when ld is 14 OFDM symbols, and the PDSCH mapping type A is set, and 'pos1' is set in dmrs-AdditionalPosition, the DMRS position l bar may be {l0, l1}. For example, when ld is 14 OFDM symbols, and the PDSCH mapping type A is set, and 'pos2' is set in dmrs-AdditionalPosition, the DMRS position l bar may be {l0, 7, 11}. For example, when ld is 14 OFDM symbols, and the PDSCH mapping type A is set, and 'pos3' is set in dmrs-AdditionalPosition, the DMRS position l barmay be {l0, 5, 8, 11}. For example, when ld is 13 OFDM symbols, and PDSCH mapping type B is set, and 'pos0' is set in dmrs-AdditionalPosition, DMRS position l bar may be l0. For example, when ld is 13 OFDM symbols, and PDSCH mapping type B is set, and 'pos1' is set in dmrs-AdditionalPosition, DMRS position l bar may be {l0, 9}. For example, when ld is 13 OFDM symbols, and PDSCH mapping type B is set, and 'pos2' is set in dmrs-AdditionalPosition, DMRS position l bar may be {l0, 5, 9}. For example, when ld is 13 OFDM symbols, and PDSCH mapping type B is set, and 'pos3' is set in dmrs-AdditionalPosition, DMRS position l bar may be {l0, 3, 6, 9}. The value set in dmrs-AdditionalPosition may be equal to a certain value of dmrs-AdditionalPosition.

[0303] DMRS position l bar may be the DMRS position l for double-symbol DMRS (front DMRS of single symbol) bar For example, when the period ld is any of 5 to 7 OFDM symbols, l ba r may be l0. For example, when the period ld is 14 OFDM symbols, and PDSCH map ping type A is set, and 'pos0' is set in dmrs-AdditionalPosition, l bar may be l0. For example, when the period ld is 14 OFDM symbols, and When PDSCH mapping type A is configured and 'pos1' is configured in dmrs-AdditionalPosition l bar may be {l0,10}. When the period ld is 13 OFDM symbols, and PDSCH mapping type B is configured, and 'pos0' is configured in dmrs-AdditionalPosition l bar may be l0. When the period ld is 13 OFDM symbols and PDSCH mapping type B is configured, and 'pos1' is configured in dmrs-AdditionalPosition, l bar may be {l0,8}.

[0304] Support may be provided when the upper layer parameter dmrs-TypeA-Position is equal to 'pos2' and the upper layer parameter dmrs-AdditionalPosition is equal to 'pos3'. When the upper layer parameter dmrs-TypeA-Position is equal to 'pos2', l d may be 3 or 4 OFDM symbols.

[0305] In the case of PDSCH mapping type A, l1 may be 11 or 12. In the case of PDSCH mapping type A, and when the condition is met, l1 may be 12. In the case of PDSCH mapping type A, and when the condition is not met, l1 may be 11.

[0306] l' may be 0 or {0,1}. For example, in the case of single-symbol front DMRS When combined and in the case of DMRS configuration type 1, and when the supported antenna ports are from 1000 to 1003, l’ may be 0. For example, in the case of single-symbol front DMRS, and in the case of DMRS configuration type 2, and when the supported antenna ports are from 1000 to 1005, l’ may be 0. For example, in the case of double-symbol front DMRS, and in the case of DMRS configuration type 1, and when the supported antenna ports are from 1000 to 1007, l’ may be {0,1}. For example, in the case of double-symbol front DMRS, and in the case of DMRS configuration type 2, and when the supported antenna ports are from 1000 to 1011, l’ may be {0,1}. For example, in the case of double-symbol front DMRS, and in the case of DMRS configuration type 1, and when the supported antenna ports are from 1000 to 1015, l’ may be {0,1}. For example, in the case of double-symbol front DMRS, and in the case of DMRS configuration type 2, and when the supported antenna ports are from 1000 to 1023, l’ may be {0,1}.

[0307] In the case of DMRS configuration type 1, the subcarrier index k may be 4n + 2k’ + Δ. In the case of DMRS configuration type 2, the subcarrier index k may be 6n + k’ + Δ.

[0308] At least Δ, w t (l’), w f (k’), and when part or all of λ is determined, the antenna port 1000 + i may be the same as the DMRS port i. In the case of DMRS configuration type 1 and when DMRS extension is not set, i may be an integer from 0 to 7. DMRS configuration In the case of type 1 and when DMRS extension is set, i may be an integer from 0 to 15. In the case of DMRS configuration type 2 and when DMRS extension is not set, i may be an integer from 0 to 11. In the case of DMRS configuration type 2 and when DMRS extension is set, i may be an integer from 0 to 23.

[0309] Δ may be determined based at least on the antenna port. Δ may be determined based at least on the antenna port and the DMRS configuration type. Δ may be determined based at least on the antenna port, the DMRS configuration type, and whether DMRS extension is applied. For example, in the case of DMRS configuration type 1 and the antenna port being any one of {1000, 1001, 1004, 1005}, Δ may be 0. For example, in the case of DMRS configuration type 1 and the antenna port being any one of {1002, 1003, 1006, 1007}, Δ may be 1. For example, in the case of DMRS configuration type 1 and the antenna port being any one of {1000, 1001, 1004, 1005, 1008, 1009, 1012, 1013}, Δ may be 0. For example, in the case of DMRS configuration type 1 and the antenna port being any one of {1002, 1003, 1006, 1007, 1010, 1011, 1014, 1015}, Δ may be 1. For example, in the case of DMRS configuration type 1 and DMRS extension not being applied and the antenna port being any one of {1000, 1001, 1004, 1005}, Δ may be 0. For example, in the case of DMRS configuration type 1 and DMRS extension not being applied and the antenna port being any one of {1002, 1003, 1006, 1007}, Δ may be 1. For example, in the case of DMRS configuration type 1 and DMRS extension being applied and the antenna port being any one of {1000, 1001, 1004, 1005, 1008, 1009, 1012, 1013}, Δ may be 0. For example, in the case of DMRS configuration type 1 and DMRS extension being applied and the antenna port being any one of {1002, 1003, 1006, 1007, 1010, 1011, 1014, 1015}, Δ may be 1. When Δ is 0, the CDM group λ may be 0. When Δ is 1, the CDM group λ may be 1.

[0310] In the case of DMRS configuration type 2 and when the antenna port is any one of {1000, 1001, 1006, 1007}, Δ may be 0. For example, in the case of DMRS configuration type 2 and when the antenna port is any one of {1002, 1003, 1008, 1009}, Δ may be 2. For example, in the case of DMRS configuration type 2 and when the antenna port is any one of {1004, 1005, 1010, 1011}, Δ may be 4. In the case of DMRS configuration type 2 and when the antenna port is any one of {1000, 1001, 1006, 1007, 1012, 1013, 1018, 1019}, Δ may be 0. For example, in the case of DMRS configuration type 2 and when the antenna port is any one of {1002, 1003, 1008, 1009, 1014, 1015, 1020, 1021}, Δ may be 2. For example, in the case of DMRS configuration type 2 and when the antenna port is any one of {1004, 1005, 1010, 1011, 1016, 1017, 1022, 1023},... When it is the case, Δ may be 4. In the case of DMRS configuration type 2, and when DMRS extension is not applied, and when the antenna port is any one of {1000, 1001, 1006, 1007}, Δ may be 0. For example, in the case of DMRS configuration type 2, and when DMRS extension is not applied, and when the antenna port is any one of {1002, 1003, 1008, 1009}, Δ may be 2. For example, in the case of DMRS configuration type 2, when DMRS extension is not applied, and when the antenna port is any one of {1004, 1005, 1010, 1011}, Δ may be 4. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is any one of {1000, 1001, 1006, 1007, 1012, 1013, 1018, 1019}, Δ may be 0. For example, in the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is any one of {1002, 1003, 1008, 1009, 1014, 1015, 1020, 1021}, Δ may be 2. For example, in the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is any one of {1004, 1005, 1010, 1011, 1016, 1017, 1022, 1023}, Δ may be 4. When Δ is 0, the CDM group λ may be 0. When Δ is 2, the CDM group λ may be 1. When Δ is 4, the CDM group λ may be 2.

[0311] w t (l’) may be determined based on one or both of the antenna port and the DMRS configuration type. It may be. w t (l’) may be determined based on at least the antenna port, the DMRS configuration type, and whether DMRS extension is applied. In the case of DMRS configuration type 1, w It may be. In the case of DMRS configuration type 1, (0) may be +1. In the case of DMRS configuration type 1, and when the antenna port is any one of {1000, 1001, 1002, 1003}, w t (0) may be +1. In the case of DMRS configuration type 1, and when the antenna port is any one of {1000, 1001, 1002, 1003}, wt (1) may be +1. In the case of DMRS configuration type 1 and when the antenna port is any one of {1004, 1005, 1006, 1007}, w t (1) may be -1. In the case of DMRS configuration type 1 and when the antenna port is any one of {1008, 1009, 1010, 1011}, w t (1) may be +1. In the case of DMRS configuration type 1 and when the antenna port is any one of {1012, 1013, 1014, 1015}, w t (1) may be -1. In the case of DMRS configuration type 1, when DMRS extension is applied, and when the antenna port is any one of {1008, 1009, 1010, 1011}, w t (1) may be +1. In the case of DMRS configuration type 1, when DMRS extension is applied, and when the antenna port is any one of {1012, 1013, 1014, 1015}, w t (1) may be -1.

[0312] In the case of DMRS configuration type 2, w t (0) may be +1. In the case of DMRS configuration type 2 and when the antenna port is any one of {1000, 1001, 1002, 1003, 1004, 1005}, w t (1) may be +1. In the case of DMRS configuration type 2 and when the antenna port is any one of {1006, 1007, 1008, 1009, 1010, 1011}, w t (1) may be -1. In the case of DMRS configuration type 2 and when the antenna port is any one of {1012, 1013, 1014, 1015, 1016, 1017}, w t (1) may be +1. In the case of DMRS configuration type 2 and when the antenna port is any one of {1018, 1019, 1020, 1021, 1022, 1023}, w t(1) may be -1. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is any of {1012, 1013, 1014, 1015, 1016, 1017}, w t (1) may be +1. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is any of {1018, 1019, 1020, 1021, 1022, 1023}, w t (1) may be -1.

[0313] w f (k’) may be determined based on one or both of the antenna port and the DMRS configuration type. w f (k’) may be determined based on some or all of the antenna port, the DMRS configuration type, whether DMRS extension is applied, and the DCI format. w f (k’) may be determined based on some or all of the antenna port, the DMRS configuration type, whether DMRS extension is applied, and whether DMRS reception assistance is indicated. In the case of DMRS configuration type 1, f (0) may be +1. In the case of DMRS configuration type 1, and when the antenna port is any of {1000, 1002, 1004, 1006, 1008, 1010, 1012, 1014}, w f (1) may be +1. In the case of DMRS configuration type 1, and when the antenna port is any of {1001, 1003, 1005, 1007, 1009, 1011, 1013, 1015}, w f (1) may be -1. In the case of DMRS configuration type 1, and when DMRS extension is applied, and when the antenna port is any of {1000, 1002, 1004, 1006, 1008, 1010, 1012, 1014}, w f(1) may be +1. In the case of DMRS configuration type 1, and when DMRS extension is applied, and when the antenna port is any of {1001, 1003, 1005, 1007, 1009, 1011, 1013, 1015}, w f (1) may be -1.

[0314] In the case of DMRS configuration type 1, w f (2) may be -1. In the case of DMRS configuration type 1 , and when DMRS extension is applied, w f (2) may be -1. In the case of DMRS configuration type 1, and when DMRS extension is applied, and when DMRS reception assistance is indicated, w f (2) may be -1. In the case of DMRS configuration type 1, and when DMRS extension is applied, and when DMRS reception assistance is not indicated, w f (2) may be -1, w f (2) may not be used. In the case of DMRS configuration type 1, and when the antenna port is {1008, 1010, 1012, 1014}, w f (3) may be -1. In the case of DMRS configuration type 1, and when the antenna port is {1009, 1011, 1013, 1015}, w f (3) may be +1. In the case of DMRS configuration type 1, and when DMRS extension is applied, and when the antenna port is {1008, 1010, 1012, 1014}, w f (3) may be -1. In the case of DMRS configuration type 1, and when DMRS extension is applied, and when the antenna port is {1009, 1011, 1013, 1015}, w f (3) may be +1. In the case of DMRS configuration type 1, and when DMRS extension is applied, and when the antenna port is {1008, 1010, 1012, 1014}, and when DMRS reception assistance is indicated, w f(3) may be -1. When it is DMRS configuration type 1, and DMRS extension is applied, and the antenna port is {1009, 1011, 1013, 1015}, and DMRS reception assistance is indicated, w f (3) may be +1. When it is DMRS configuration type 1, and DMRS extension is applied, and the antenna port is {1008, 1010, 1012, 1014}, and DMRS reception assistance is not indicated, w f (3) may be -1, w f (3) may not be used. When it is DMRS configuration type 1, and DMRS extension is applied, and the antenna port is {1009, 1011, 1013, 1015}, and DMRS reception assistance is not indicated, w f (3) may be +1, w f (3) may not be used.

[0315] For DMRS configuration type 2, w f (0) may be +1. When it is DMRS configuration type 2, and the antenna port is any one of {1000, 1002, 1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020, 1022} in this case, w f (1) may be +1. When it is DMRS configuration type 2, and the antenna port is any one of {1001, 1003, 1005, 1007, 1009, 1011, 1013, 1015, 1017, 1019, 1021, 1023} in this case, w f (1) may be -1. When it is DMRS configuration type 2, and DMRS extension is applied, and the antenna port is any one of {1000, 1002, 1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020, 1022} in this case, w f(1) may be +1. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is any of {1001, 1003, 1005, 1007, 1009, 1011, 1013, 1015, 1017, 1019, 1021, 1023}, w f (1) may be -1.

[0316] In the case of DMRS configuration type 2, w f (2) may be -1. In the case of DMRS configuration type 2 and when DMRS extension is applied, w f (2) may be -1. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when DMRS reception assistance is indicated, w f (2) may be -1. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when DMRS reception assistance is not indicated, w f (2) may be -1, w f (2) may not be used. In the case of DMRS configuration type 2, and when the antenna port is {1012, 1014, 1016, 1018, 1020, 1022}, w f (3) may be -1. In the case of DMRS configuration type 2, and when the antenna port is {1013, 1015, 1017, 1019, 1021, 1023}, w f (3) may be +1. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is {1012, 1014, 1016, 1018, 1020, 1022}, w f (3) may be -1. In the case of DMRS configuration type 2, and when DMRS extension is applied, and when the antenna port is {1013, 1015, 1017, 1019, 1021, 1023}, w f(3) may be +1. When it is DMRS configuration type 2, and DMRS extension is applied, and the antenna port is {1012, 1014, 1016, 1018, 1020, 1022}, and DMRS reception assistance is indicated, w f (3) may be -1. When it is DMRS configuration type 2, and DMRS extension is applied, and the antenna port is {1013, 1015, 1017, 1019, 1021, 1023}, and DMRS reception assistance is indicated, w f (3) may be +1. When it is DMRS configuration type 2, and DMRS extension is applied, and the antenna port is {1012, 1014, 1016, 1018, 1020, 1022}, and DMRS reception assistance is not indicated, w f (3) may be -1, w f (3) may not be used. When it is DMRS configuration type 2, and DMRS extension is applied, and the antenna port is {1013, 1015, 1017, 1019, 1021, 1023}, and DMRS reception assistance is not indicated, w f (3) may be +1, w f (3) may not be used.

[0317] The PTRS (Phase tracking reference signal) for PDSCH may be determined based on the sequence of PTRS (PTRS sequence) and the mapping to physical resources. The sequence (PTRS sequence) corresponding to the PTRS for PDSCH may be generated. The mapping of the sequence to physical resources may mean that the sequence is mapped to one or more resource elements. The sequence r(n) of PTRS may be the same as the sequence of DMRS. For example, the sequence r k = r(2m + k’) of PTRS may be the DMRS (DMRS sequence) at symbol position l0 and sub - carrier index k. .

[0318] The PTRS may exist in the resource block used for the PDSCH. The terminal device 1 may assume that the PTRS (PDSCH - PTRS) is scaled by β so as to match the transmission power. PTRS The terminal device 1 may assume that the PTRS is mapped to one or more resource elements (k, l). p,μ to be The PTRS sequence r k may be mapped to one or more resource elements a based on Equation 2. (p,μ) k,l a (p,μ) k,l may be referred to as a physical resource. The physical resource may be one or more resource elements.

Equation

[0319] The OFDM symbol index l in Equation 2 may be an index within the OFDM symbol allocated for PDSCH transmission. One or more first resource elements for the PTRS may not be used for one or more second resource elements for the DMRS.

[0320] The sub - carrier index k for the PTRS may be determined based at least on k RE ref and may also be determined based on at least one of the DMRS port (antenna port) and the DMRS configuration type. For example, k k RE ref may be determined based on one or both of the DMRS port (antenna port), the DMRS configuration type, and whether DMRS extension is applied. For example, k RE ref may be determined based on some or all of the DMRS port (antenna port), the DMRS configuration type, and whether DMRS extension is applied. For example, k RE refmay be determined based on some or all of the following: the DMRS port (antenna port), the DMRS configuration type, whether DMRS extensions are applied, and whether DMRS reception assistance is indicated.

[0321] The DMRS transmission procedure for a PUSCH scheduled on a first PDCCH with a first DCI format may be applied to a PUSCH scheduled on a second PDCCH with a second DCI format. The first DCI format may be DCI format 0_1. The second DCI format may be DCI format 0_2.

[0322] The transmitted PUSCH is in DCI format with CRC scrambled by the first RNTI. It is not scheduled by port 0_1 / 0_2 and does not correspond to the grant to be set. In addition, if the PUSCH is not for a Type 2 random access procedure, the terminal device 1 may use a single-symbol forward DMRS of DMRS setting type 1 in DMRS port 0. The remaining resource elements not used for the first PUSCH transmission are not used for the first PUSCH transmission. If transform precoding is not applied, the first PUSCH transmission may be The additional DMRS may be a PUSCH with an allocation duration of one OFDM symbol. The first RNTI may be transmitted according to the ring type and the PUSCH period. The first RNTI may be a C-RNTI, a CS-RNTI, a SP-CSI-RNTI, or an MCS-C-RNTI.

[0323] If frequency hopping is not applied, the higher layer parameter dmrs-AdditionalPosition is It may be assumed that it is equal to 'pos2' and that up to two additional DMRSs are transmitted according to the PUSCH period. When frequency hopping is applied, it may be expected that the upper layer parameter dmrs-AdditionalPosition is equal to 'pos1' and that up to one additional DMRS is transmitted according to the PUSCH period.

[0324] When PUSCH is scheduled with DCI format 0_0 with a CRC scrambled with CS-RNTI, the terminal device 1 may use single-symbol front DMRS at DMRS port 0. The single-symbol front DMRS may correspond to the DMRS setting type provided by the upper layer parameter dmrs-Type. When PUSCH is scheduled with DCI format 0_0 with a CRC scrambled with CS-RNTI, the terminal device 1 may use single-symbol front DMRS at DMRS port 0. The single-symbol front DMRS may correspond to the DMRS setting type provided by the upper layer parameter dmrs-Type. It may correspond to the DMRS setting type provided by the upper layer parameter dmrs-Type.

[0325] The maximum number of front DMRSs for PUSCH may be set by a first upper layer parameter. The first upper layer parameter may be the upper layer parameter maxLength, or may be the upper layer parameter msgA-MaxLength. When the first upper layer parameter is not set, the single-symbol front DMRS may be scheduled by DCI, or may be set by the grant setting (the grant being set). The number of additional DMRSs for PUSCH may be set by a second upper layer parameter. The maximum number of front DMRSs for PUSCH may be set by a first upper layer parameter. The first upper layer parameter may be the upper layer parameter maxLength, or may be the upper layer parameter msgA-MaxLength. When the first upper layer parameter is not set, the single-symbol front DMRS may be scheduled by DCI, or may be set by the grant setting (the grant being set). The number of additional DMRSs for PUSCH may be set by a second upper layer parameter. When the first upper layer parameter is not set, the single-symbol front DMRS (single-symbol DMRS) may be scheduled by DCI, or may be set by the grant setting (the grant being set). The number of additional DMRSs for PUSCH may be set by a second upper layer parameter. When the first upper layer parameter is not set, the single-symbol front DMRS (single-symbol DMRS) may be scheduled by DCI, or may be set by the grant setting (the grant being set). The number of additional DMRSs for PUSCH may be set by a second upper layer parameter. Yes. The second upper layer parameter may be 'pos0', 'pos1', 'pos2', 'pos3'. For example, when the first upper layer parameter is not set, the second upper layer parameter may be 'pos0', 'pos1', 'pos2', 'pos3'. The second upper layer parameter may also be dmrs-AdditionalPosition. When the first upper layer parameter is set, the front DMRS of a single symbol (single symbol DMRS) or the front DMRS of a double symbol (double symbol DMRS) may be scheduled by DCI, or may be set by the grant being set. When the first upper layer parameter is set, the second upper layer parameter may be 'pos0', 'pos1'.

[0326] When the terminal device 1 that transmits the first PUSCH is set by the upper layer parameter phaseTrackingRS the terminal device 1 may assume that the first setting and the second setting do not occur simultaneously for the transmitted PUSCH. The first setting may be that 4 to 7 DMRS ports are scheduled in the case of DMRS setting type 1. The first setting may be that 6 to 11 DMRS ports are scheduled in the case of DMRS setting type 2. The second setting may be that PTRS is transmitted. The first PUSCH may be a PUSCH scheduled by DCI format 0_2 The first PUSCH may also be a PUSCH scheduled by DCI format 0_0 or DCI format 0_1. The first setting may be 4 to 7 DMRS ports and 12 in the case of DMRS setting type 1. ​​​Any one of the DMRS ports from 0 to 15 may be scheduled. In the case of DMRS configuration type 1, the first configuration may be that any one of the DMRS ports from 6 to 11 and the DMRS ports from 18 to 23 are scheduled. The first configuration may be that, in the case of DMRS configuration type 1 and when DMRS extension is applied, any one of the DMRS ports from 4 to 7 and and any one of the DMRS ports from 12 to 15 are scheduled. The first configuration may be that, in the case of DMRS configuration type 1 and when DMRS extension is applied, any one of the DMRS ports from 6 to 11 and the DMRS ports from 18 to 23 are scheduled.

[0327] The procedure of PTRS transmission may be applied to the first PUSCH transmission (UE PUSCH transmission). The first PUSCH transmission may be a PUSCH transmission scheduled by the first DCI format when the first upper layer parameter is configured. The first upper layer parameter may be phaseTrackingRS. The first DCI format may be DCI format 0_0, DCI format 0_1, or DCI format 0_2. The first PUSCH transmission may be a PUSCH transmission corresponding to the configured grant when the first upper layer parameter is configured. PTRS may exist in the second PUSCH. The second PUSCH may be a PUSCH transmission scheduled by a PDCCH with a CRC scrambled by the second RNTI. The second PUSCH may be a PUSCH transmission corresponding to the configured grant. The second RNTI may be any one of MCS-C-RNTI, C-RNTI, CS-RNTI, and SP-CSI-RNTI.

[0328] If transform precoding is not applied and the higher layer parameter phaseTrackingRS in the higher layer parameter DMRS-UplinkConfig is set, some or all of Operation 1, Operation 2, Operation 3, and part of Operation 4 may be executed, instructed, assumed, or determined.

[0329] The maximum number of PTRS ports may be given by the higher layer parameter maxNrofPorts. The higher layer parameter maxNrofPorts may be a higher layer parameter in the higher layer parameter UplinkConfig. The terminal device 1 may not expect that the number of PTRS ports (or UL PTRS ports) set is more than the number reported.

[0330] The terminal device 1 may report the ability to support full - coherent UL transmission. If the terminal device 1 reports the ability to support full - coherent UL transmission, the terminal device 1 may expect that the number of PTRS ports (or UL PTRS ports) is set to 1.

[0331] Two transmission methods may be supported for PUSCH. The two transmission methods may be codebook based transmission (or codebook based UL transmission) and non - codebook based transmission (or non - codebook based UL transmission).

[0332] ​One PTRS port may be associated with one DMRS port. In the case of codebook transmission or non-codebook transmission, the relationship (Association between (UL) PTRS port(s) and DMRS port(s)) between the PTRS port and the DMRS port may be signaled (indicated) by the first field. This may be the case. The first field may be a PTRS-DMRS association field. The first field may be included in DCI format 0_1 or DCI format 0_2. When corresponding to a grant for which PUSCH is configured (for example, grant type 1 configured), the relationship between the PTRS port and the DMRS port may be value 0 or "00" in the first field.

[0333] When PUSCH is scheduled by DCI format 0_0, the PTRS port may be associated with DMRS port 0.

[0334] In non-codebook transmission, the number of PTRS ports (actual number) may be determined based on the SRI (SRS resource indicator) in the first DCI format or the upper layer parameter sri-ResourceIndicator. For example, the number of PTRS ports (actual number) may be 8. When two SRS resource sets are configured and the upper layer parameter usage is set to 'noncodebook', the PTRS ports for the transmission corresponding to each SRS resource set ​The number (actual number) may be determined based on the SRI corresponding to the related SRS resource set, or may be determined based on the upper layer parameters srs-ResourceIndicator / srs-ResourceIndicator2 corresponding to the related SRS resource set. The PTRS port index (PTRS port) may be set by the upper layer parameter ptrs-PortIndex. For example, when the upper layer parameter phaseTrackingRS is set, the PTRS port index may be set by the upper layer parameter ptrs-PortIndex. The PTRS port index may be the PTRS port index for each set SRS resource.

[0335] In the case of codebook transmission in either partial-coherent or non-coherent, the number (actual number) of PTRS ports may be determined based on one or both of the TPMI and the number of layers. The number of layers may be determined based on the DCI format For example, in DCI format 0_1 and the DCI format The number of layers may be indicated by the precoding information and number of layer (field). When the upper layer parameter maxNrofPorts is set to 'n2', the transmission layer associated with the number of PTRS ports (actual number) may be derived from the TPMI. For example, antenna port 1000 and antenna port 1002 in the TPMI may share PTRS port 0. Antenna port 1001 and antenna port 1003 in the TPMI may share PTRS port 1. PTRS port 0 may be associated with layer x. Layer x may be transmitted on antenna port 1000 and antenna port 1002 in the TPMI. PTRS port 1 may be associated with layer y. Layer y may be transmitted on antenna port 1001 and antenna port 1003 in the TPMI. One or both of x and y may be given by the PTRS-DMRS relationship (PTRS-DMRS relationship field), which is a DCI parameter. For example, antenna ports {1000, 1002, 1004, 1006} may share PTRS port 0. Antenna ports {1001, 1003, 1005, 1007} may share PTRS port 1.

[0336] PTRS port 0 may be associated with layer x'. Layer x' may be transmitted on some or all of antenna ports {1000, 1002, 1004, 1006}. PTRS port 1 may be associated with layer y'. Layer y' may be transmitted on some or all of antenna ports {1001, 1003, 1005, 1007}. When the upper layer parameter maxNrofPorts is 'n2' and in the case of partial coherence or non-coherence, layer x' and layer y' may be determined. When eight antenna ports are applied, layer x' and layer y' may be given. When DMRS extension is applied, layer x' and layer y' may be given.

[0337] The precoding information - layer number field may be included in one or both of DCI format 0_1 and DCI format 0_2. For example, the precoding information - layer number field may determine the number of layers and the TPMI (or TPMI index). The TPMI (Transmission Precoding Matrix Indicator) may be used to determine the precoding matrix for the PUSCH. The precoding matrix may be used for the mapping between layers and antenna ports. The precoding matrix may be used for beamforming. The number of information bits constituting the precoding information - layer number field may be determined based on some or all of the number of antenna ports, the maximum rank (number of layers), whether transform precoding is applied, the power mode, and the codebook subset. The information bits may be a bit field.

[0338] The antenna port field may be included in one or both of DCI format 0_1 and DCI format 0_2. The value of the antenna port field may determine either or both of the DMRS ports and the number of CDM groups without data (DMRS - CDM groups). When transform precoding is applied, the rank (number of layers) may be 1. When transform precoding is applied, and the upper - layer parameter dmrs - Type is 1, and the upper - layer parameter maxLength is 1, and DMRS extension is not applied, 4 One of the four DMRS ports may be determined by the antenna port field. When transform precoding is applied, and the upper - layer parameter dmrs - Type is 1, and the upper - layer parameter maxLength is 1, and DMRS extension is applied When used, one of the eight DMRS ports may be determined by the antenna port field.

[0339] When transform precoding is applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 2, and DMRS extension is not applied, one of the eight DMRS ports may be determined by the antenna port field. When transform precoding is applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 2, and DMRS extension is applied, one of the 16 DMRS ports may be determined by the antenna port field.

[0340] When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 1 and DMRS extension is not applied, one of the four DMRS ports may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 1, and DMRS extension is applied, one of the eight DMRS ports may be determined by the antenna port field.

[0341] When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 2 When this is the case and DMRS extension is not applied, two of the four DMRS ports may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 2, and DMRS extension is applied, two of the eight DMRS ports may be determined by the antenna port field.

[0342] When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 3 When this is the case and DMRS extension is not applied, the DMRS ports {0, 1, 2} may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 3, and DMRS extension is applied, three of the eight DMRS ports may be determined by the antenna port field When DMRS extension is applied, there may be multiple combinations of the three DMRS ports determined by the antenna port field.

[0343] When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 1 If so, and if DMRS extension is not applied, one of the eight DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 1, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 1, and if DMRS extension is applied, one of the 16 DMRS ports may be determined by the antenna port field.

[0344] If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 1, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 2 If so, and if DMRS extension is not applied, two of the eight DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 1, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 2, and if DMRS extension is applied, two of the 16 DMRS ports may be determined by the antenna port field.

[0345] If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 1, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 3 If so, and if DMRS extension is not applied, eight DMRS ports (or seven DMRS Among the 3 DMRS ports of the port), they may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 3, and DMRS extension is applied, 3 out of 16 DMRS ports (or 15 DMRS ports, or 14 DMRS ports) may be determined by the antenna port field. Among the 3 DMRS ports of the port), they may be determined by the antenna port field.

[0346] When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 4 and DMRS extension is not applied, 4 out of 8 DMRS ports may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 1, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 4, and DMRS extension is applied, 4 out of 16 DMRS ports may be determined by the antenna port field.

[0347] When transform precoding is not applied, and the upper layer parameter dmrs-Type is 2, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 1 If so, and if DMRS extension is not applied, one of the six DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 1, and if the rank (number of layers) is 1, and if DMRS extension is applied, one of the twelve DMRS ports may be determined by the antenna port field.

[0348] If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 1, and if the rank (number of layers) is 2 If so, and if DMRS extension is not applied, two of the six DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 1, and if the rank (number of layers) is 2, and if DMRS extension is applied, two of the twelve DMRS ports may be determined by the antenna port field.

[0349] If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 1, and if the rank (number of layers) is 3 If so, and if DMRS extension is not applied, three of the six DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 1, and if the rank (number of layers) is 3, and if DMRS extension is applied, three of the twelve DMRS ports may be determined by the antenna port field.

[0350] When transform precoding is not applied, and the upper layer parameter dmrs-Type is 2, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 4 and when DMRS extension is not applied, 4 out of 6 DMRS ports (or 4 DMRS ports) may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 2, and the upper layer parameter maxLength is 1, and the rank (number of layers) is 4 and when DMRS extension is applied, 4 out of 12 DMRS ports (or 8 DMRS ports) may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 2, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 1

[0351] and when DMRS extension is not applied, 1 out of 12 DMRS ports may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 2, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 1, and DMRS extension is applied, 1 out of 24 DMRS ports may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 2, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 2 and when DMRS extension is applied, 1 out of 24 DMRS ports may be determined by the antenna port field. When transform precoding is not applied, and the upper layer parameter dmrs-Type is 2, and the upper layer parameter maxLength is 2, and the rank (number of layers) is 2

[0352] and when DMRS extension is applied, 1 out of 24 DMRS ports may be determined by the antenna port field. If so, and if DMRS extension is not applied, two of the 12 DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 2, and if DMRS extension is applied, two of the 24 DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 3, and if DMRS extension is not applied, three of the 12 DMRS ports (or 11 DMRS ports) may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 3, and if DMRS extension is applied, three of the 24 DMRS ports (or 22 DMRS ports) may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 4, and if DMRS extension is not applied, four of the 12 DMRS ports may be determined by the antenna port field.

[0353] ports) may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 3, and if DMRS extension is applied, three of the 24 DMRS ports (or 22 DMRS ports) may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 3, and if DMRS extension is not applied, three of the 12 DMRS ports (or 11 DMRS ports) may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 3, and if DMRS extension is applied, three of the 24 DMRS ports (or 22 DMRS ports) may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 4, and if DMRS extension is applied, four of the 24 DMRS ports (or 22 DMRS ports) may be determined by the antenna port field.

[0354] If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 4, and if DMRS extension is not applied, four of the 12 DMRS ports may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 4, and if DMRS extension is not applied, four of the 12 DMRS ports may be determined by the antenna port field. ​ート may be determined by the antenna port field. If transform precoding is not applied, and if the upper layer parameter dmrs-Type is 2, and if the upper layer parameter maxLength is 2, and if the rank (number of layers) is 4, and if DMRS expansion is applied, 4 out of the 24 DMRS ports may be determined by the antenna port field. Of the 24 DMRS ports, 4 DMRS ports may be determined by the antenna port field.

[0355] The rank (or the value of the rank) may be determined according to the SRS resource indicator field. The rank (or the value of the rank) may be determined according to the precoding information - number of layers field.

[0356] Whether DMRS reception assistance is applied may be determined based on the DCI format. For example, the antenna port field included in the DCI format may determine whether DMRS reception assistance is applied. For example, 1 bit out of the information bits constituting the antenna port field may determine whether DMRS reception assistance is applied.

[0357] The PTRS-DMRS association field may be included in one or both of DCI format 0_1 and DCI format 0_2. If DMRS expansion is not applied, the number of bits (number of information bits) constituting the PTRS-DMRS association field may be 2 bits. If DMRS expansion is applied, the number of bits constituting the PTRS-DMRS association field may be 3 bits.

[0358] ​​​​​The PTRS-DMRS relationship field may indicate the relationship between the PTRS port and the DMRS port. One or two PTRS ports may be set by upper layer parameters (e.g., maxNrofPorts). The DMRS port may be indicated by the antenna port field. If the SRS resource indication field exists and the maximum rank number is greater than 2, the PTRS-DMRS relationship field may indicate the relationship between the DMRS port and the PTRS port corresponding to one or both of the SRS resource indication field and the precoding information - number of layers field.

[0359] If the SRS resource indication field exists, and the SRS resource indication field is equal to "01" and "11", and the maximum rank number is 2, the most significant bit (MSB) of the PTRS-DMRS relationship field may indicate the relationship between the DMRS port and the PTRS port corresponding to one or both of the SRS resource indication field and the precoding information - number of layers field. Also, in these cases, the least significant bit (LSB) of the PTRS-DMRS relationship field may indicate the relationship between the DMRS port and the PTRS port corresponding to one or both of the second SRS resource indicator field and the second precoding information field. The maximum rank number may be determined by the upper layer parameter maxRank.

[0360] The Second PTRS-DMRS association field may be included in one or both of DCI format 0_1 and DCI format 0_2. When DMRS extension is not applied, the number of bits (information bits) constituting the PTRS-DMRS association field may be 2 bits. When DMRS extension is applied, the number of bits constituting the PTRS-DMRS association field may be 3 bits. The Second PTRS-DMRS association field may indicate the relationship between the DMRS ports and the PTRS ports corresponding to one or both of the Second SRS resource indication field and the Second precoding information field.

[0361] The Second precoding information field may be included in one or both of DCI format 0_1 and DCI format 0_2. For example, the Second precoding information field may determine the TPMI (or TPMI index). One or both of the SRS resource indicator field and the Second SRS resource indicator field may be included in DCI format 0_1 and DCI format 0_2.

[0362] The DMRS for PUSCH may be determined based on part or all of sequence generation, precoding, and mapping to physical resources. The sequence r(n) of the DMRS may be the same as the sequence of the DMRS for PDSCH. For example, the sequence r(n) of the DMRS may be determined based at least on the pseudo-random sequence c(i).

[0363] The transmitting unit and the baseband unit in the transmitting unit may generate DMRS (DMRS sequence). The DMRS (DMRS sequence) r(n) may be mapped to physical resources. For example, the DMRS r(n) may be mapped to physical resources after being mapped to virtual resources. The DMRS (PDSCH-DMRS) may be mapped to a virtual resource (or an intermediate quantity) a’ (p’(j),μ) k,l and may be mapped to the virtual resource a’ based at least on the frequency-domain orthogonal cover code index k’. (p’,μ) k,l If DMRS reception assistance is not applied, k’ may be {0,1}. If DMRS reception assistance is applied, k’ may be {0,1,2,3}. The subcarrier index k may be determined based on the frequency-domain orthogonal cover code index k’ and the DMRS setting type. p’ j may be p’(j). p’ j may be from p’0 to p’ v-1 v may be the number of layers. The vector by the virtual resource a’ of length v (p’(j),μ) k,l may be converted to the vector of the physical resource a of length ρ by at least the precoding matrix W (p,μ) k,l The vector by the virtual resource a’ of length v source a’ (p’(j),μ) k,l may be converted to the vector of the physical resource a of length ρ by multiplication with the precoding matrix W (p,μ) k,l The vector of {p’0, ..., p’ v-1} may be a set of virtual antenna ports. The virtual antenna port may be a DMRS antenna port. The virtual antenna port and the DMRS antenna port may be referred to as antenna ports. {p0, ..., p ρ-1} may be a set of antenna ports. The precoding matrix W may be used for precoding for PUSCH. The precoding matrix may be determined by the TPMI (TPMI index). That is, the precoding matrix may be determined based on the precoding information - number of layers field in the DCI format.

[0364] The transmitting unit and the baseband unit in the transmitting unit may generate a PTRS (PTRS sequence). The PTRS (PTRS sequence) r p’(j) (m) in layer j may be generated. For example, when j is j’, r p’(j’) (m) may be the DMRS sequence r(m). For example, when j is j’’, r p’(j’’) (m) may be the DMRS sequence r(m). For example, when j is neither j’ nor j’’, r p’(j) (m) may be 0. p’(j’) may be an antenna port (virtual antenna port, DMRS port) related to PTRS transmission. p’(j’) and p’(j’’) may be antenna ports (virtual antenna ports, DMRS antenna ports) related to PTRS transmission. p’(j’) may be related to the first DMRS port. p’(j’’) may be related to the second DMRS port. One or both of the first DMRS port and the second DMRS port may be determined by the PTRS - DMRS relationship field.

[0365] The PTRS (PTRS sequence) r p’(j) (m) may be mapped to the physical resource a (p,μ) k,l based at least on the precoding matrix W. For example, the vector by r p’(j) (m) of length v is converted to a vector of the physical resource a of length ρ by at least the precoding matrix W (p,μ) k,l The vector of p may be {p0, ..., p ρ-1}}.

[0366] The sub-carrier index k for PTRS is k RE ref determined based at least on may also be. k RE ref may be determined based on one or both of the DMRS antenna port p’ and the DMRS configuration type. For example, k may be determined based on. For example, k RE ref may be determined based on part or all of the DMRS antenna port p’, the DMRS configuration type and whether DMRS extension is applied. For example, k RE ref may be determined based on part or all of the DMRS antenna port p’, the DMRS configuration type, whether DMRS extension is applied, and whether DMRS reception assistance is indicated.

[0367] As an issue, in order to increase the number of simultaneous connections of a terminal device, extension of the DMRS port is necessary. However, one or more first DMRS ports used by a terminal device (for example, terminal device 1) may interfere with one or more second DMRS ports used by other terminal devices. For example, even if the resources (physical resources) for the first DMRS port are different from those for the second DMRS port, interference may exist. And the interference may inhibit communication. Also, PTRS may be used for correction of phase error. However, since one PTRS port may correspond to one of one or more DMRS ports PTRS port enhancement is also necessary for extension of the DMRS port. For example, one or both of means 1 and means 2 may be used for part or all of DMRS port extension, PTRS port enhancement, and interference suppression.

[0368] FIG. 9 is a diagram showing an example of mapping to an antenna port of DMRS in one aspect of this embodiment. The first DMRS (DMRS sequence) may be mapped to a resource element corresponding to OFDM symbol 910 and antenna port #900 (AP#900). The second DMRS may be mapped to a resource element corresponding to OFDM symbol 911 and antenna port #901 (AP#901). The third DMRS may be mapped to a resource element corresponding to OFDM912 and antenna port #902 (AP#902). In FIG. 9, one block may be a resource element. In FIG. 9, a block with a “+” or “-” described therein may have DMRS arranged (mapped). In FIG. 9, a white block may not have DMRS arranged.

[0369] The first DMRS may be mapped to a first physical resource. The second DMRS may be mapped to a second physical resource. The third DMRS may be mapped to a third physical resource. The first physical resource may be based on at least OFDM symbol 910 and antenna port #900. The second physical resource may be based on at least OFDM symbol 911 and antenna port #901. The third physical resource may be based on at least OFDM symbol 912 and antenna port #902. In FIG. 9, DMRS extension may be applied. In FIG. 9, DMRS reception assistance may or may not be applied.

[0370] In FIG. 9, “+” may mean that w

[0371] (k’) is +1. In FIG. 9, “-” f may mean that w (k’) is -1. The DMRS in FIG. 9 is in DMRS setting type 1. f In FIG. 9, “+” may mean that w It may be the front DMRS of a single symbol. For example, w for the first DMRS corresponding to antenna port #900 f (k’) may be { w f (0)=+1, w f (1)=-1, w f (2)=-1, w f (3)=+1}. w for the second DMRS corresponding to antenna port #901 f (k’) may be { w f (0)=+1, w f (1)=-1, w f (2)=+1, w f (3)=-1}. w for the third DMRS corresponding to antenna port #902 f (k’) may be { w f (0)=+1, w f (1)=-1}, or {w f (0)=+1, w f (1)=-1, w f (2)=+1, w f (3)=-1}.

[0372] For example, antenna port #901 may be antenna port #902. That is, antenna port #901 may be the same as antenna port #902. OFDM symbol 911 may be the same as OFDM symbol 912. When DMRS reception assistance is applied, the second DMRS may be mapped based on the second w (k’). When DMRS reception assistance is not applied, the third DMRS may be mapped based on the second w (k’). The second w f (k’) may be {+1,-1,+1,-1}. When DMRS reception assistance is applied, k’ being {0,1,2,3} is also acceptable, and the second DMRS may be mapped based on the second w (k’). DMRS reception f (k’) may be mapped based on the second w f (k’). The second w (k’) may be {+1,-1,+1,-1}. When DMRS reception assistance is applied, k’ being {0,1,2,3} is acceptable, and the second DMRS may be mapped based on the second w f (k’). DMRS reception When no assistance is applied, k’ may be {0,1}, and the third DMRS may be mapped based on the second w f (k’).

[0373] In FIG. 9, the CDM group corresponding to antenna port #900 may be the same as the CDM group corresponding to antenna port #901. The first DMRS and the second DMRS may be scheduled simultaneously. The CDM group corresponding to antenna port #900 may be the same as the CDM group corresponding to antenna port #902. The first DMRS may not be expected to be scheduled simultaneously with the second DMRS. Both antenna port #900 and antenna port #902 may not be used. For example, in one or both of one PDSCH transmission and one PUSCH transmission, both antenna port #900 and antenna port #902 may not be used. For example, in one or both of one PDSCH transmission and one PUSCH transmission, both antenna port #900 and antenna port #902 may not be used.

[0374] OFDM symbol 910, OFDM symbol 911, and OFDM symbol 912 may be the same OFDM symbol. The base station device 3 may perform the first PDSCH transmission with the first DMRS for the first terminal device and the second PDSCH transmission with the second DMRS for the second terminal device in the same resource element. The base station device 3 may not perform the first PDSCH transmission with the first DMRS for the first terminal device and the third PDSCH transmission with the third DMRS for the third terminal device in the same resource element. The terminal device 1 at antenna port #900 may not expect the precoding of the co-scheduled terminal device at antenna port #902. The base station device 3 may perform the first PDSCH transmission with the first DMRS for the first terminal device and the second PDSCH transmission with the second DMRS for the second terminal device in the same resource element. The base station device 3 may not perform the first PDSCH transmission with the first DMRS for the first terminal device and the third PDSCH transmission with the third DMRS for the third terminal device in the same resource element. The base station device 3 may not perform the first PDSCH transmission with the first DMRS for the first terminal device and the third PDSCH transmission with the third DMRS for the third terminal device in the same resource element.

[0375] The terminal device 1 at antenna port #900 may not expect the precoding of the co-scheduled terminal device at antenna port #902.

[0376] When DMRS expansion is not applied, antenna port #900 may not be used, and antenna port #902 may be used.

[0377] In means 1, the DMRS (DMRS sequence, sequence of DMRS) r(·) for PDSCH may be mapped to one or more resource elements a (p,μ) k,l The DMRS (DMRS sequence, sequence of DMRS) r(·) for PUSCH may be mapped to one or more virtual resources a' (p’(j),μ) k,l The virtual resource may be mapped to one or more resource elements a based on the precoding matrix W (p,μ) k,l One or more resource elements may be referred to as physical resources respectively.

[0378] When DMRS is mapped to a physical resource (or a virtual resource), w f (k') may be used That is, DMRS may be mapped to a physical resource (or a virtual resource) based at least on the first frequency-domain orthogonal cover code index k', or the second frequency-domain orthogonal cover code index k'. The first frequency-domain orthogonal cover code index k' may be 0 and 1. The second frequency-domain orthogonal cover code index k' may be 0, 1, 2, and 3.

[0379] In means 1, when DMRS reception assistance is not applied, the physical resource (or the virtual resource) may be determined based on the first index k'. When DMRS reception assistance is applied, the physical resource (or the virtual resource) may be determined based on the second index k'.

[0380] ​​When DMRS reception assistance is applied, the number of subcarriers for DMRS is expected to be 4 or more. If DMRS reception assistance is not applied, the number of subcarriers for DMRS may be set to 2 or less. When DMRS reception assistance is applied, the length K of the DMRS mapping in the frequency domain may be 4. When DMRS reception assistance is not applied, the length K of the DMRS mapping in the frequency domain may be 2. For example, the length K of the DMRS mapping in the frequency domain may be the length of the frequency domain orthogonal cover code. If the subcarrier-related index is k'', then the frequency domain orthogonal covering The DMRS code index k′ may be mod(k″, K). Whether the DMRS extension is applied may be determined by a higher layer parameter. Whether the DMRS reception assistance is applied may be determined based on the DCI format. The DCI format may indicate whether the DMRS reception assistance is applied.

[0381] The first field in the DCI format determines the antenna port (DMRS port). The second field in the DCI format indicates whether DMRS reception assistance is applied. The DCI format may determine whether the DMRS reception assistance is applied. The first field may be the same as the second field. That is, one field in the DCI format may indicate one or both of the antenna port (DMRS port) and whether DMRS reception assistance is applied. For example, if the DMRS extension is applied, one field in the DCI format may indicate both the antenna port (DMRS port) and whether DMRS reception assistance is applied. For example, if the DMRS extension is not applied, one field in the DCI format may not indicate whether DMRS reception assistance is applied.

[0382] The maximum number of DMRS ports when DMRS extension is applied may be greater than the maximum number of DMRS ports when DMRS extension is not applied. For example, when DMRS extension is applied, the maximum number of DMRS ports may be a first value. When DMRS extension is not applied, the maximum number of DMRS ports may be a second value.

[0383] In means 2, PTRS (PTRS sequence, sequence of PTRS) for PDSCH may be provided. PTRS (PTRS sequence, sequence of PTRS) for PUSCH may be provided. One or more of the DMRS ports among which exactly one or two DMRS ports may be determined based on one field in the DCI format. Each of the one or two DMRS ports may be related to one PTRS port. The P TRS port may be an antenna port related to PTRS transmission.

[0384] When DMRS extension is not applied, one field may be composed of 0, or X bits. When DMRS extension is applied, one field may be composed of 0, or X' bits. X' bits may be larger than X bits. X bits may be 2 bits. X' bits may be 3 bits. When DMRS extension is applied and layer extension is applied, one field may be composed of 0, or X' bits. The maximum number of layers when layer extension is applied may be greater than the maximum number of layers when layer extension is not applied. For example, when layer extension is applied, link transmission with up to 8 layers may be performed. When layer extension is applied, one field may be composed of 0, or X' bits.

[0385] The subcarrier index for PTRS may be determined based at least on whether DMRS extension is applied. For example, kRE ref It may be determined based on at least whether DMRS extension is applied.

[0386] In means 2, when DMRS extension is applied, PTRS may not be transmitted. For example, when DMRS extension is applied and a certain antenna port is used, PTRS may or may not be transmitted. A certain antenna port may be an antenna port (DMRS port) that becomes available due to the application of DMRS extension. For example, when DMRS extension is applied and DMRS reception assistance is applied, PTRS may or may not be transmitted. For example, when DMRS extension is applied and DMRS reception assistance is not applied, PTRS may or may not be transmitted. When DMRS extension is applied, it may be assumed that there is no PTRS. When the upper layer parameter phaseTrackingRS is set, it may not be expected that DMRS extension is applied. When DMRS extension is applied, it may not be expected that the upper layer parameter phaseTrackingRS is set.

[0387] When PTRS is mapped in a resource element of a first antenna port, data may not be mapped in the resource element of a second antenna port. When PTRS is mapped in a resource element of a first antenna port for terminal device 1, it may not be expected that data is mapped in the resource element of a second antenna port for the co-scheduled terminal device. When DMRS extension is applied for terminal device 1, terminal device 1 may not expect that DMRS extension is not applied for the co-scheduled terminal device. When DMRS reception assistance is applied for terminal device 1, terminal device 1 may not expect that DMRS reception assistance is not applied for the co-scheduled terminal device.

[0388] When PTRS is transmitted in one or more resource elements of the first antenna port, data or signals may not be expected to be transmitted in the one or more resource elements of the second antenna port. The first antenna port may be antenna port #900. The first antenna port may be one of the antenna ports made available by applying DMRS extension. The first antenna port may be the antenna port for terminal device 1. The second antenna port may be the antenna port for terminal device 1 or another terminal device (e.g., the co-scheduled terminal device). Even if data or signals are not expected to be transmitted in the one or more resource elements of the second antenna port when PTRS is transmitted in one or more resource elements of the first antenna port. The first antenna port may be antenna port #900. The first antenna port may be one of the antenna ports made available by applying DMRS extension. The first antenna port may be the antenna port for terminal device 1. The second antenna port may be the antenna port for terminal device 1 or another terminal device (e.g., the co-scheduled terminal device).

[0389] The antenna port made available by applying DMRS extension may not be the antenna port related to PTRS. For example, it may be assumed that there is no PTRS in the antenna port made available by applying DMRS extension.

[0390] Terminal device 1 may include a receiving unit that receives PDSCH and a DCI format that instructs the reception of the PDSCH. Terminal device 1 may include a transmitting unit that generates part or all of PDSCH, DMRS (DMRS sequence) for the PDSCH, and PTRS (PTRS sequence) for the PDSCH, or a baseband unit in the transmitting unit.

[0391] The DCI format may include a first field. The first field may indicate first information or may not indicate first information. Indicating the first information may be applying DMRS reception assistance. The first field may be an antenna port field. The DCI format may include a first field. The first field may indicate first information or may not indicate first information. Indicating the first information may be applying DMRS reception assistance. The first field may be an antenna port field.

[0392] DMRS may be mapped to one or more resource elements (or physical resources). The one or more resource elements may be a first index or a second index DMRS may be mapped to one or more resource elements (or physical resources). The one or more resource elements may be a first index or a second index It may be determined based on the index. The possible values of the first index may not be the same as the possible values of the second index. The first index may be values of 0 and 1. The second index may be values of 0, 1, 2, and 3. The first index and the second index may be indices in the frequency domain. The first index and the second index may be frequency domain orthogonal cover code indices.

[0393] One or more resource elements may be determined based on the first length or the second length. The first length may be 2. The second length may be 4. The first length and the second length may be lengths in the frequency domain. The first length and the second length may be the number of elements of w (k’). The first length and the second length may be the lengths of the frequency domain orthogonal cover code. f

[0394] If the first field does not indicate the first information, one or more resource elements may be determined based on one or both of the first index and the first length. If the first field indicates the first information, one or more resource elements may be determined based on one or both of the second index and the second length.

[0395] The terminal device 1 may include a radio resource control layer processing unit that receives the first upper layer parameter. The first upper layer parameter may be a parameter related to one or both of the number of DMRS ports and the maximum number of DMRS ports. For example, when the first upper layer parameter is set, the DCI format may include the first field. The first upper layer para meter is not set, the DCI format may not include the first field. When the first upper layer parameter is set, the maximum number of DMRS ports may be the first value. When the first upper layer parameter is not set, the maximum number of DMRS ports may be the second value. The first value may be different from the second value. The first upper layer parameter may be ExtendedDMRSports.

[0396] The terminal device 1 may include a receiving unit that receives a PDCCH to which DCI is mapped. The terminal device 1 may include a transmitting unit that transmits some or all of a PUSCH, DMRS for the PUSCH, and PTRS for the PUSCH. DCI may instruct transmission of the PUSCH. The terminal device 1 may include a transmitting unit that generates DMRS (DMRS sequence) for the PUSCH and PTRS (PTRS sequence) for the PUSCH, or include a baseband unit in the transmitting unit. The DMRS sequence for the PUSCH may be defined. The PTRS sequence for the PUSCH may be provided.

[0397] The DCI format may include a second field. The second field may indicate one DMRS port out of N DMRS ports. One PTRS port may be determined based on one DMRS port. The second field may indicate two DMRS ports out of N' DMRS ports. Two PTRS ports may be determined based on two DMRS ports. The PTRS port for the PTRS may be determined based on the second field and one or more DMRS ports for the DMRS. The antenna port related to the PTRS may be determined based on the second field and one or more DMRS ports for the DMRS.

[0398] When the second upper layer parameter is not set, the second field may be composed of a first number of bits ( number of information bits). When the second upper layer parameter is set, the second The field may be composed of a second number of bits (number of information bits). The first number of bits may be 2 bits. The second number of bits may be 3 bits.

[0399] The terminal device 1 may include a radio resource control layer processing unit that receives a second upper layer parameter. The second upper layer parameter may be a parameter related to one or both of the number of DMRS ports and the maximum number of DMRS ports. When the first upper layer parameter is set, the maximum number of DMRS ports may be a third value. When the first upper layer parameter is not set, the maximum number of DMRS ports may be a second value. The first value may be different from the fourth value. The first upper layer parameter may be set for the downlink. The second upper layer parameter may be set for the uplink. The second upper layer parameter may be ExtendedDMRSports.

[0400] Hereinafter, aspects of various devices according to one aspect of the present embodiment will be described.

[0401] (1) To achieve the above object, an aspect of the present invention takes the following means. That is, a first aspect of the present invention is a terminal device, comprising a receiving unit that receives a PDSCH and a DCI format for instructing reception of the PDSCH. The DCI format includes a first field. The DMRS for the PDSCH is mapped to one or more resource elements, and the one or more resource elements are determined based on a first index or a second index. The values that the first index can take are not the same as the values that the second index can take. When the first field does not indicate first information, the one or more resource elements are determined based on the first index. When the first field indicates the first information, the one or more resource elements are determined based on the second index. Further, it comprises a radio resource control layer processing unit that receives a first upper layer parameter, and the first upper layer parameter relates to the maximum number of DMRS ports for the DMRS.

[0402] (2) A second aspect of the present invention is a base station device, comprising a transmitting unit that transmits a PDSCH and a DCI format for instructing reception of the PDSCH. The DCI format includes a first field. The DMRS for the PDSCH is mapped to one or more resource elements, and the one or more resource elements are determined based on a first index or a second index. The values that the first index can take are not the same as the values that the second index can take. When the first field does not indicate first information, the one or more resource elements are determined based on the first index. When the first field indicates the first information, the one or more resource elements are determined based on the second index. Further, it comprises a radio resource control layer processing unit that transmits a first upper layer parameter, and the first upper layer parameter relates to the maximum number of DMRS ports for the DMRS.

[0403] (3) A third aspect of the present invention is a terminal device, comprising a receiving unit that receives a PDCCH to which a DCI format for instructing transmission of a PUSCH is mapped, a transmitting unit that transmits the PUSCH, and the transmitting unit that generates a DMRS for the PUSCH and a PTRS for the PUSCH. A first upper layer parameter is related to the maximum number of DMRS ports for the DMRS. When the first upper layer parameter is not set, a first field in the DCI format is composed of a first number of bits. When the first upper layer parameter is set, the first field in the DCI format is composed of a second number of bits. Based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined.

[0404] (4) A fourth aspect of the present invention is a terminal device, comprising a transmitting unit that transmits a PDCCH to which a DCI format for instructing transmission of a PUSCH is mapped, and a receiving unit that receives the PUSCH. A DMRS for the PUSCH and a PTRS for the PUSCH are generated. A first upper layer parameter is related to the maximum number of DMRS ports for the DMRS. When the first upper layer parameter is not set, a first field in the DCI format is composed of a first number of bits. When the first upper layer parameter is set, the first field in the DCI format is composed of a second number of bits. Based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined.

[0405] The base station device 3 and the program operating on the terminal device 1 according to the present invention may be a program (a program that functions a computer) that controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments according to the present invention. And the information handled by these devices is temporarily stored in a RAM (Random Access Memory) during its processing. It is stored in various ROMs such as Flash ROM (Read Only Memory) and HDDs (Hard Disk Drives) and is read by the CPU as needed for modification and writing.

[0406] In addition, part of the terminal device 1 and the base station device 3 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to be realized.

[0407] Here, the "computer system" refers to a computer system built in the terminal device 1 or the base station device 3 and includes hardware such as an OS and peripheral devices. Also, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in a computer system.

[0408] Furthermore, the "computer-readable recording medium" may include something that holds a program dynamically for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and something that holds a program for a certain time, such as a volatile memory inside a computer system that becomes a server or a client in that case. Also, the above program may be for realizing a part of the above-described functions, and may further be realized in combination with a program already recorded in the computer system for realizing the above-described functions.

[0409] In addition, the base station device 3 in the above-described embodiment can also be realized as an assembly (device group) composed of a plurality of devices. Each of the devices constituting the device group may include some or all of the functions or function blocks of the base station device 3 related to the above-described embodiment. As long as the device group has all the functions or function blocks of the base station device 3, it is sufficient. Also, the terminal device 1 related to the above-described embodiment can also communicate with the base station device as an assembly.

[0410] In addition, the base station device 3 in the above-described embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). Also, the base station device 3 in the above-described embodiment may have some or all of the functions of a higher-level node with respect to an eNodeB and / or a gNB.

[0411] Also, the terminal device 1, a part of the base station device 3, or all of them may be typically realized as an LSI which is an integrated circuit, or may be realized as a chipset. Each function block of the terminal device 1 and the base station device 3 may be individually chipized, or some or all of them may be integrated and chipized. Also, the method of integrating into an integrated circuit is not limited to an LSI, and may be realized by a dedicated circuit, or a general-purpose processor. Also, with the progress of semiconductor technology, when an integrated circuit technology replacing an LSI appears, it is also possible to use the integrated circuit according to the technology. In addition, in the above-described embodiment, a terminal device is described as an example of a communication device, but the invention of the present application is not limited thereto, and it can also be applied to stationary or non-mobile electronic devices installed indoors or outdoors, such as AV devices, kitchen devices, cleaning / washing devices, air conditioning devices, office devices, vending machines, and other terminal devices or communication devices such as living devices.

[0412]

[0413] ​As described above in detail with reference to the drawings regarding the embodiments of the present invention, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present invention are also included. Further, the present invention can be variously modified within the scope shown in the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Further, a configuration in which elements described in the above embodiments and elements having the same effects are replaced with each other is also included.

Explanation of Reference Numerals

[0414] 1(1A, 1B, 1C) Terminal device 3 Base station device 10, 30 Radio transmission / reception unit 10a, 30a Radio transmission unit 10b, 30b Radio reception unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit 91, 92, 93, 94 Search area set 300 Component carrier 301 Primary cell 302, 303 Secondary cell 700 Set of resource elements for PSS 710, 711, 712, 713 Set of resource elements for PBCH and DMRS for PBCH 720 Set of resource elements for SSS 3000 Point 3001, 3002 Resource grid 3003, 3004 BWP 3011, 3012, 3013, 3014 Offset 3100, 3200 Common resource block set 900, 901, 902 Antenna Ports 910, 911, 912 OFDM Symbols

Claims

1. a receiving unit that receives a PDCCH to which a DCI format for instructing transmission of a PUSCH is mapped; a transmitting unit that transmits the PUSCH; the transmitting unit that generates a DMRS for the PUSCH and a PTRS for the PUSCH; and a first upper layer parameter is related to the maximum number of DMRS ports for the DMRS; when the first upper layer parameter is not set, the first field in the DCI format is composed of a first number of bits; when the first upper layer parameter is set, the first field in the DCI format is composed of a second number of bits; based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined a terminal device.

2. a transmitting unit that transmits a PDCCH to which a DCI format for instructing transmission of a PUSCH is mapped; a receiving unit that receives the PUSCH; and a DMRS for the PUSCH and a PTRS for the PUSCH are generated; a first upper layer parameter is related to the maximum number of DMRS ports for the DMRS; when the first upper layer parameter is not set, the first field in the DCI format is composed of a first number of bits; when the first upper layer parameter is set, the first field in the DCI format is composed of a second number of bits; based on the first field and one or more DMRS ports for the DMRS, a PTRS port for the PTRS is determined a base station device.

3. a communication method used for a terminal device, comprising: receiving a PDCCH to which a DCI format for instructing transmission of a PUSCH is mapped; transmitting the PUSCH; generating a DMRS for the PUSCH and a PTRS for the PUSCH; and a first upper layer parameter is related to the maximum number of DMRS ports for the DMRS; when the first upper layer parameter is not set, the first field in the DCI format is composed of a first number of bits; when the first upper layer parameter is set, the first field in the DCI format is composed of a second number of bits; ​ ​ ​ ​ ​ ​ Based on the first field and one or more DMRS ports for the DMRS , a PTRS port for the PTRS is determined Communication method

Images