COMMUNICATION DEVICE, BASE STATION, AND COMMUNICATION METHOD

Abstract

This communication device (100) comprises: a reception unit (112) that receives, from a base station (210), a medium access control element (MAC CE) or downlink control information (DCI) that includes transform precoder information indicating whether to apply a transform precoder; and a control unit (120) that determines which parameter, among a first parameter to be used when the transform precoder is applied and a second parameter to be used when the transform precoder is not applied, to use for a parameter that is set for the target of the transform precoder information.

Description

Communication device and communication method CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and claims the benefit of priority from patent application serial number 2022-126222, filed August 8, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a communication device and a communication method used in a mobile communication system.

[0003] In 3GPP (registered trademark, the same applies hereinafter) (3rd Generation Partnership Project), a standardization project for mobile communication systems, orthogonal frequency division multiplexing (OFDM) using a cyclic prefix (CP) (hereinafter referred to as "CP-OFDM") or discrete Fourier transform spreading (DFT spreading) OFDM (hereinafter referred to as "DFT-s-OFDM") can be applied as the waveform of the uplink signal. DFT-s-OFDM is CP-OFDM to which a function for performing DFT spreading (hereinafter referred to as "transform precoder") is applied. Therefore, depending on whether or not a transform precoder is applied, it is possible to switch between the waveforms of DFT-s-OFDM or CP-OFDM.

[0004] In 3GPP Releases 15 and 16, whether to apply a transform precoder is configured in a communication device by a network (e.g., a base station) using signaling of a radio resource control (RRC) layer (hereinafter referred to as "RRC signaling"). However, when RRC signaling is used, processing delay in the communication device increases compared to when signaling of a layer lower than the RRC layer is used, and therefore, there is a risk that it may not be possible to switch whether to apply a transform precoder at an appropriate timing depending on the situation.

[0005] Therefore, a technology is being studied that enables flexible control of uplink transmission by more dynamically switching the waveform of uplink signals, which has been switched using RRC signaling (see, for example, Non-Patent Document 1).

[0006] 3GPP contribution “RWS-210307”

[0007] A communication device according to a first aspect includes: a receiving unit that receives, from a base station, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder; and a control unit that determines, for a parameter set for a target of the transform precoder information, whether to use a first parameter that is used when the transform precoder is applied or a second parameter that is used when the transform precoder is not applied.

[0008] A communication method according to a second aspect is a communication method executed by a communication device, and includes the steps of receiving, from a base station, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder, and determining, for a parameter set for a target of the transform precoder information, whether to use a first parameter used when the transform precoder is applied or a second parameter used when the transform precoder is not applied.

[0009] Objects, features, advantages, etc. of the present disclosure will become clearer from the following detailed description with reference to the accompanying drawings. Fig. 1 is a diagram illustrating a configuration of a mobile communication system according to an embodiment. Fig. 2 is a diagram illustrating an example configuration of a protocol stack according to an embodiment. Fig. 3 is a diagram illustrating application of a transform precoder. Fig. 4 is a diagram illustrating a configuration of a UE according to an embodiment. Fig. 5 is a diagram illustrating a configuration of a base station according to an embodiment. Fig. 6 is a sequence diagram illustrating an example operation according to an embodiment.

[0010] A mobile communication system according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[0011] However, the existing 3GPP technical specifications do not have a specific mechanism for dynamically switching the waveform of an uplink signal using signaling in a layer lower than the RRC layer, which raises concerns that it may be difficult to appropriately switch and transmit the waveform of an uplink signal using signaling in a layer lower than the RRC layer.

[0012] Therefore, one of the objectives of the present disclosure is to provide a communication device and a communication method that enable the waveform of an uplink signal to be dynamically switched and appropriately transmitted using signaling in a layer lower than the RRC layer.

[0013] (System Configuration) First, the configuration of a mobile communication system 1 according to this embodiment will be described with reference to Fig. 1. The mobile communication system 1 is, for example, a system that complies with the 3GPP Technical Specification (TS). In the following, the mobile communication system 1 will be described using, as an example, a 5th Generation System (5G system) of the 3GPP standard, i.e., a mobile communication system based on NR (New Radio).

[0014] The mobile communication system 1 includes a network 10 and a user equipment (UE) 100 that communicates with the network 10. The network 10 includes a next generation radio access network (NG-RAN) 20, which is a 5G radio access network, and a 5G core network (5GC) 30, which is a 5G core network.

[0015] The UE 100 is a communication device that communicates via the base station 200. The UE 100 may be a device used by a user. The UE 100 may be a mobile device such as a mobile phone terminal such as a smartphone, a tablet terminal, a laptop PC, a communication module, or a communication card. The UE 100 may be a vehicle (e.g., a car, a train, etc.) or a device provided therein. The UE 100 may be a transport vehicle other than a vehicle (e.g., a ship, an airplane, etc.) or a device provided therein. The UE 100 may be a sensor or a device provided therein. The UE 100 may be called a terminal, a terminal device, a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, a subscriber device, a subscriber unit, a wireless station, a wireless terminal, a wireless device, a wireless unit, a remote station, a remote terminal, a remote device, or a remote unit. The UE 100 is an example of a terminal, and the terminal may include factory equipment, etc.

[0016] The NG-RAN 20 includes multiple base stations 200. Each base station 200 manages at least one cell. A cell constitutes the smallest unit of a communication area. One cell belongs to one frequency (carrier frequency). The term "cell" may refer to wireless communication resources or to the communication target of the UE 100. Each base station 200 can perform wireless communication with the UE 100 located in its own cell. The base station 200 communicates with the UE 100 using a RAN protocol stack. Details of the protocol stack will be described later. The base station 200 is also connected to other base stations 200 (which may be referred to as neighboring base stations) via an Xn interface. The base station 200 communicates with neighboring base stations via the Xn interface. The base station 200 provides NR user plane and control plane protocol termination for the UE 100 and is connected to the 5GC 30 via an NG interface. Such an NR base station 200 is sometimes referred to as a gNodeB (gNB).

[0017] The 5GC 30 includes a core network device 300. The core network device 300 includes, for example, an AMF (Access and Mobility Management Function) and / or a UPF (User Plane Function). The AMF performs mobility management for the UE 100. The UPF provides functions specialized for U-plane processing. The AMF and the UPF are connected to the base station 200 via an NG interface.

[0018] (Configuration Example of Protocol Stack) Next, a configuration example of a protocol stack according to this embodiment will be described with reference to FIG.

[0019] The protocol of the wireless section between UE 100 and base station 200 includes a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, and an RRC layer.

[0020] The PHY layer performs encoding / decoding, modulation / demodulation, antenna mapping / demapping, and resource mapping / demapping. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the base station 200 via a physical channel.

[0021] The MAC layer performs data priority control, retransmission processing using Hybrid ARQ (HARQ), random access procedures, etc. Data and control information are transmitted between the MAC layer of UE 100 and the MAC layer of base station 200 via a transport channel. The MAC layer of base station 200 includes a scheduler. The scheduler determines the uplink and downlink transport format (transport block size, modulation and coding scheme (MCS)) and the resources to be allocated to UE 100.

[0022] The RLC layer transmits data to the RLC layer on the receiving side using the functions of the MAC layer and the PHY layer. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the base station 200 via logical channels.

[0023] The PDCP layer performs header compression / decompression and encryption / decryption.

[0024] A Service Data Adaptation Protocol (SDAP) layer may be provided as an upper layer above the PDCP layer. The SDAP layer maps IP flows, which are units for Quality of Service (QoS) control by the core network, to radio bearers, which are units for QoS control by an Access Stratum (AS).

[0025] The RRC layer controls logical channels, transport channels, and physical channels according to the establishment, re-establishment, and release of radio bearers. RRC signaling for various settings is transmitted between the RRC layer of the UE 100 and the RRC layer of the base station 200. When an RRC connection exists between the RRC of the UE 100 and the RRC of the base station 200, the UE 100 is in an RRC connected state. When there is no RRC connection between the RRC of the UE 100 and the RRC of the base station 200, the UE 100 is in an RRC idle state. When the RRC connection between the RRC of the UE 100 and the RRC of the base station 200 is suspended, the UE 100 is in an RRC inactive state.

[0026] The NAS layer, which is located above the RRC layer in the UE 100, performs session management and mobility management for the UE 100. NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the core network device 300.

[0027] In addition, the UE 100 has an application layer and the like in addition to the radio interface protocol.

[0028] (Radio Frame Configuration) In a 5G system, downlink transmission and uplink transmission are configured within a radio frame having a duration of 10 ms. For example, a radio frame is configured with 10 subframes. For example, one subframe may be 1 ms. Furthermore, one subframe may be configured with one or more slots. For example, the number of symbols that make up one slot is 14 for a normal CP (Cyclic Prefix) and 12 for an extended CP. Furthermore, the number of slots that make up one subframe varies depending on the set subcarrier spacing. For example, for a normal CP, if the subcarrier spacing is set to 15 kHz, the number of slots per subframe is 1 (i.e., 14 symbols); if the subcarrier spacing is set to 30 kHz, the number of slots per subframe is 2 (i.e., 28 symbols); if the subcarrier spacing is set to 60 kHz, the number of slots per subframe is 4 (i.e., 56 symbols); and if the subcarrier spacing is set to 120 kHz, the number of slots per subframe is 8 (i.e., 128 symbols). Furthermore, if the subcarrier spacing is set to 60 kHz for an extended CP, the number of slots per subframe is 4 (i.e., 48 symbols). That is, the number of slots constituting one subframe is determined based on the subcarrier spacing set by the base station 200. Furthermore, the number of symbols constituting one subframe is determined based on the subcarrier spacing set by the base station 200. That is, the number of symbols constituting a 1 ms subframe is determined based on the subcarrier spacing set by the base station 200, and the length of each symbol (length in the time direction) changes.

[0029] (Waveform) Waveforms in the mobile communication system 1 according to the embodiment will be described with reference to FIG. 3 . The waveforms of signals transmitted and received in the mobile communication system 1 may be cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) or discrete Fourier transform spreading-orthogonal frequency division multiplexing (DFT-s-OFDM). In the mobile communication system 1 based on a 5G system, the downlink transmission waveform may be ODFM using a cyclic prefix (CP). The uplink transmission waveform may be ODFM using a CP together with a transform precoding function that performs DFT spreading, which may be disabled or enabled. In operation using shared spectrum channel access in frequency range (FR) 1, the subcarrier mapping of the uplink transmission waveform may be mapped to subcarriers in one or more physical resource block (PRB) interlaces.

[0030] For example, either CP-OFDM or DFT-s-OFDM may be used for uplink signals such as a physical uplink shared channel (PUSCH) and / or phase tracking reference signals (PTRS). On the other hand, CP-OFDM may be used for downlink signals such as a physical downlink shared channel (PDSCH). Furthermore, for example, CP-OFDM may be used for signals used for direct communication between UEs 100, such as sidelink signals (e.g., physical sidelink shared channel (PSSCH)).

[0031] CP-OFDM has the advantage of being resistant to multipath interference because it is a multicarrier waveform, but has the disadvantage of increasing the peak-to-average power ratio (PAPR). Also, since CP-OFDM is a multicarrier waveform, it is possible to frequency-division multiplex a transmission data sequence and a reference signal (RS) on different subcarriers of the same symbol. Furthermore, the transmission band of the CP-OFDM transmission signal is not limited to a contiguous frequency band (for example, one or more contiguous physical resource blocks (PRBs)), but may be composed of a discontinuous frequency band (for example, a plurality of discontinuous PRBs), so there are fewer scheduling constraints compared to DFT-s-OFDM. For this reason, for example, in cells where the load is higher than a predetermined level, the use of CP-OFDM can improve frequency utilization efficiency.

[0032] Since DFT-s-OFDM is a single-carrier waveform, it can reduce PAPR more than CP-OFDM. Therefore, it is possible to use power close to the maximum rated power (maximum rated power), and it is possible to use a higher-order modulation scheme and / or a higher coding rate. As a result, it is possible to reduce the power consumption and / or cost of the UE 100. It also makes it easier to ensure a coverage area. On the other hand, in DFT-s-OFDM, the transmission data sequence and RS of a certain UE 100 are time-division multiplexed onto different symbols. That is, the transmission data sequence and RS of a certain UE 100 are not frequency-division multiplexed onto different subcarriers of the same symbol, which is different from CP-OFDM. Furthermore, the transmission band of the transmission signal of DFT-s-OFDM is limited to a continuous frequency band (for example, one or more continuous PRBs).

[0033] As shown in FIG. 3A, DFT-s-OFDM differs from CP-OFDM shown in FIG. 5B in that it includes a transform precoder. DFT-s-OFDM is CP-OFDM to which a transform precoder is applied. The transform precoder may be a function that performs DFT spreading. The transform precoder may also be referred to as transform precoding, DFT precoder, DFT precoding, or the like.

[0034] In DFT-s-OFDM, the coded and modulated transmission data sequence or RS is input to an M-point DFT and transformed from the time domain to the frequency domain. The output from the DFT is mapped to M subcarriers and input to an N-point inverse fast Fourier transform (IFFT) and transformed from the frequency domain to the time domain. Note that the DFT may be replaced with a fast Fourier transform (FFT), and the IFFT may be replaced with an inverse discrete Fourier transform (IDFT). When N>M, unused input information to the IFFT is set to zero. N may be equal to the number of subcarriers corresponding to a predetermined frequency bandwidth (e.g., bandwidth portion (BWP) or cell bandwidth). M may be the number of subcarriers corresponding to the transmission bandwidth. As a result, the output of the IFFT becomes a signal with small instantaneous power fluctuations and whose bandwidth depends on M. The output from the IFFT is parallel to serial (P / S) converted and a CP is added. The CP is also called a guard interval (GI). In this way, in DFT-s-OFDM, a signal having the characteristics of a single carrier is generated and transmitted in one symbol. Note that the CP may be inserted before P / S conversion of the output from the IFFT.

[0035] In CP-OFDM, the coded and modulated transmission data sequence and / or RS is mapped to a number of subcarriers equal to the transmission bandwidth and input to the IFFT. Unused input information to the IFFT is set to zero. The output from the IFFT is P / S converted and a CP is inserted. In this way, since CP-OFDM uses multiple carriers, the RS and the transmission data sequence can be frequency-division multiplexed. Of course, the transmission data sequence may be transmitted without frequency-division multiplexing with the RS.

[0036] As described above, since the characteristics of DFT-s-OFDM and CP-OFDM are in a trade-off relationship, it is desirable to switch between DFT-s-OFDM and CP-OFDM depending on various parameters (for example, cell load, scheduling situation, antenna state, etc.). Note that DFT-s-OFDM and CP-OFDM are switched depending on whether or not a transform precoder is applied.

[0037] In 3GPP Releases 15 and 16, whether to apply a transform precoder is configured in UE 100 by network 10 (e.g., base station 200) using signaling of the radio resource control (RRC) layer (hereinafter referred to as "RRC signaling"). However, when RRC signaling is used, processing delay in the communication device increases compared to when signaling of a layer lower than the RRC layer is used, and there is a risk that it will not be possible to switch whether to apply a transform precoder at an appropriate timing depending on the situation. Therefore, studies are being conducted on technologies that enable flexible control of uplink transmission by more dynamically switching the waveform of an uplink signal that has been switched using RRC signaling.

[0038] However, in the existing 3GPP technical specifications, there is no specific mechanism for dynamically switching the waveform of an uplink signal using signaling in a layer lower than the RRC layer. Therefore, there is a concern that it may be impossible to appropriately switch the waveform of an uplink signal and transmit it using signaling in a layer lower than the RRC layer. In one embodiment described later, an operation for dynamically switching the waveform of an uplink signal and appropriately transmitting it using signaling in a layer lower than the RRC layer will be described.

[0039] For example, when dynamically switching the waveform of an uplink signal using lower layer signaling, the target of the instruction regarding whether to apply a transform precoder is not specified. For example, it is not specified which serving cell and / or which uplink bandwidth portion (UL BWP) the instruction applies to for PUSCH transmission and reception. Therefore, there is a concern that PUSCH transmission and reception cannot be performed between base station 200 and UE 100.

[0040] Furthermore, the application of parameters (e.g., radio resource control (RRC) parameters) related to dynamic transform precoder switching is not specified. For example, it is not specified to which parameters set in the RRC layer dynamic transform precoder switching is applied. For this reason, there is a concern that uplink signals may not be transmitted and received appropriately between the base station 200 and the UE 100. In one embodiment described later, an operation for enabling dynamic transform precoder switching using appropriate parameters will be described.

[0041] (Configuration Information Regarding Transform Precoder) The configuration information regarding the transform precoder may be, for example, at least any of the following information. The configuration information may be transmitted from the base station 200 to the UE 100 by using a radio resource control (RRC) message. That is, the base station 200 may transmit an RRC message including configuration information regarding the transform precoder to the UE 100. Furthermore, the UE 100 may determine whether to apply a transform precoder to an uplink signal based on the configuration information included in the RRC message.

[0042] First, the configuration information related to the transform precoder may be configuration information (e.g., PUSCH-config) for configuring communication device-specific physical uplink shared channel (PUSCH) parameters applicable to a specific bandwidth portion (BWP). The PUSCH-config is included in information (e.g., BWP-UplinkDedicated) used to configure UE-specific parameters of one uplink BWP. PUSCH transmission is scheduled using a downlink control information (DCI) format (i.e., a DCI format used for PUSCH scheduling) to which a cyclic redundancy check (CRC) (CRC parity bit) scrambled by a cell radio network temporary identifier (C-RNTI) is added.

[0043] Using transform precoder information (specifically, transformPrecoder), which is a parameter included in PUSCH-config, enable or disable of transform precoding for PUSCH transmission is configured in the UE 100. The transform precoder information (transformPrecoder) is used for UE-specific selection of a transform precoder for PUSCH. If the transform precoder information (transformPrecoder) field does not exist, the UE 100 applies the value of the "msg3-transformPrecoder" field. Note that "msg3-transformPrecoder" is included in RACH-ConfigCommon.

[0044] Second, the configuration information for the transform precoder may be configuration information (e.g., ConfiguredGrantConfig) for configuring uplink transmission without a dynamic grant. ConfiguredGrantConfig may be used to configure uplink transmission without a dynamic grant according to two possible schemes. The actual uplink grant may be configured via RRC or provided via the Physical Downlink Control Channel (PDCCH) (addressed to the Configured Scheduling-Radio Network Temporary Identifier (CS-RNTI)).

[0045] Specifically, two types of transmission without dynamic grants are Configured Grant (CG) Type 1 PUSCH transmission and CG Type 2 PUSCH transmission. In CG Type 1 PUSCH transmission, the uplink grant is provided via RRC. The uplink grant is stored as a configured uplink grant. On the other hand, in CG Type 2 PUSCH transmission, the uplink grant is provided via PDCCH. That is, the uplink grant is transmitted on the PDCCH, used for PUSCH scheduling, and provided in a DCI format with CS-RNTI. The uplink grant is stored or cleared as a configured uplink grant based on L1 signaling indicating activation or deactivation of the configured uplink grant. CG type 1 PUSCH transmission and CG type 2 PUSCH transmission are configured by RRC for the serving cell per BWP.

[0046] The UE 100 stores the provided uplink grant and considers the stored uplink grant to have occurred at a predetermined timing. The predetermined timing may be, for example, a timing according to a period and / or an offset set using an RRC message. The UE 100 performs PUSCH transmission at the predetermined timing.

[0047] ConfiguredGrantConfig is included in BWP-UplinkDedicated, which is used to set UE-specific parameters for one uplink BWP. ConfiguredGrantConfig includes transform precoder information (specifically, transformPrecoder). Using the transform precoder information (transformPrecoder), which is a parameter included in ConfiguredGrantConfig, enable or disable of transform precoding for CG type 1 PUSCH transmission / CG type 2 PUSCH transmission is configured in the UE 100. Therefore, the transform precoder information (transformPrecoder) enables or disables the transform precoder for Type 1 and Type 2. If the transform precoder information (transformPrecoder) field does not exist, the UE 100 enables or disables transform precoding according to the “msg3-transformPrecoder” field in the RACH-ConfigCommon described later.

[0048] Third, the configuration information related to the transform precoder may be configuration information (e.g., RACH-ConfigCommon) for specifying cell-specific random access (RA) parameters. RACH-ConfigCommon is used to specify cell-specific RA parameters. RACH-ConfigCommon may be configuration information related to a random access procedure. RACH-ConfigCommon is included in information (e.g., BWP-UplinkCommon) used to configure cell-specific parameters (i.e., common parameters) of one uplink BWP. RACH-ConfigCommon includes transform precoder information (msg3-transformPrecoder). msg3-transformPrecoder enables a transform precoder for Msg. 3 transmission. If the msg3-transformPrecoder field is not present, the UE 100 disables the transform precoder. Therefore, using the transform precoder information (msg3-transformPrecoder), which is a parameter included in the RACH-ConfigCommon, the enable (or disable) of transform precoding for PUSCH transmission for Msg. 3 (UL-SCH of Msg. 3) in the random access procedure is set in the UE 100.

[0049] Note that Msg. 3 PUSCH transmission is scheduled in a random access (RA) response grant or a DCI format (i.e., a DCI format used for PUSCH scheduling) to which a CRC scrambled by a temporary C-RNTI (TC-RNTI) is added. The RA response grant is included in Msg. 2 (i.e., a random access response). The RA response grant is transmitted as a MAC payload for the RA response.

[0050] Fourth, the configuration information related to the transform precoder may be configuration information (e.g., MsgA-PUSCH-Config) for specifying allocation of a physical uplink shared channel (PUSCH) for message A in a two-step RA type procedure. MsgA-PUSCH-Config is used to specify allocation of a PUSCH for message A in a two-step RA type procedure. MsgA-PUSCH-Config may be configuration information related to a random access procedure. MsgA-PUSCH-Config includes transform precoder information (msgA-TransformPrecoder). msgA-TransformPrecoder enables or disables a transform precoder for transmitting MsgA. Using transform precoder information (msgA-TransformPrecoder), which is a parameter included in MsgA-PUSCH-Config, Msg. A (specifically, UL-SCH of Msg. A) in the random access procedure, the enablement or disablement of transform precoding for PUSCH transmission is set in UE 100.

[0051] Note that Msg. A PUSCH transmission is performed using PUSCH resources set by parameters (e.g., MsgA-PUSCH-Resource) included in MsgA-PUSCH-Config. MsgA-PUSCH-Resource is included in BWP-UplinkCommon, which is used to set cell-specific parameters (common parameters) for one uplink BWP.

[0052] (UE Procedure for Applying Transform Precoding on PUSCH) A UE procedure for applying transform precoding on PUSCH will now be described.

[0053] The UE 100 may apply enable / disable of transform precoding according to transform precoder information (specifically, parameter: msg3-transformPrecoder) to PUSCH transmission scheduled by an uplink grant (UL grant) in a random access (RA) response (i.e., RA response permission) or PUSCH transmission scheduled by DCI format 0-0 CRC-scrambled by TC-RNTI (Temporary C-RNTI).

[0054] The UE 100 may apply enable / disable (disable) of transform precoding to the Msg. A PUSCH transmission of the RA procedure according to the transform precoder information (specifically, the parameter: msgA-TransformPrecoder). If the parameter: msgA-TransformPrecoder is not set, the UE 100 may apply enable / disable (disable) of transform precoding to the Msg. A PUSCH transmission according to the parameter: msg3-transformPrecoder.

[0055] UE 100 may apply transform precoding enabled / disabled to PDCCH transmissions scheduled by CS-RNTI, C-RNTI, or MCS-C-RNTI with NDI=1 in the following cases (i) and (ii).

[0056] (i) If DCI format 0_0 is received (i.e., if PUSCH transmission is scheduled by DCI format 0_0), UE 100 may apply the enable / disable of transform precoding according to the parameter: msg3-transformPrecoder.

[0057] (ii) If DCI format 0_0 is not received (i.e., if PUSCH transmission is scheduled by DCI format 0_1 / 0_2), (a) if the parameter transformPrecoder included in PUSCH-Config is set, UE100 may apply enable / disable of transform precoding according to the parameter transformPrecoder included in PUSCH-Config. (ii) If DCI format 0_0 is not received, (b) if the parameter: transformPrecoder included in PUSCH-Config is not set, the UE 100 may apply the enable / disable of transform precoding according to the parameter: msg3-transformPrecoder.

[0058] The UE 100 may apply enable / disable of transform precoding to PUSCH transmission based on the configured grant in the following cases (i) and (ii): (i) If the parameter: transformPrecoder included in the ConfiguredGrantConfig is set, the UE 100 may apply enable / disable of transform precoding in accordance with the parameter: transformPrecoder included in the ConfiguredGrantConfig. (ii) If the parameter: transformPrecoder included in ConfiguredGrantConfig is not set, UE100 may apply the enable / disable of transform precoding according to the parameter: msg3-transformPrecoder.

[0059] As described above, whether to apply a transform precoder is switched by RRC signaling. Note that whether to apply a transform precoder may be rephrased as whether to enable a transform precoder, or whether to activate a transform precoder, or the like.

[0060] (Configuration of UE) The configuration of the UE 100 according to the embodiment will be described with reference to Fig. 4. The UE 100 includes a communication unit 110 and a control unit 120.

[0061] The communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving radio signals to and from the base station 200. The communication unit 110 has at least one transmission unit 111 and at least one reception unit 112. The transmission unit 111 and the reception unit 112 may be configured to include multiple antennas and RF circuits. The antenna converts a signal into radio waves and radiates the radio waves into space. The antenna also receives radio waves in space and converts the radio waves into a signal. The RF circuit performs analog processing of the signal transmitted and received via the antenna. The RF circuit may include a high-frequency filter, an amplifier, a modulator, a low-pass filter, etc.

[0062] The control unit 120 performs various controls in the UE 100. The control unit 120 controls communication with the base station 200 via the communication unit 110. The operations of the UE 100 described above and below may be operations controlled by the control unit 120. The control unit 120 may include at least one processor capable of executing a program and a memory that stores the program. The processor may execute the program to perform the operations of the control unit 120. The control unit 120 may include a digital signal processor that performs digital processing of signals transmitted and received via the antenna and the RF circuit. The digital processing includes processing of a RAN protocol stack. The memory stores the program executed by the processor, parameters related to the program, and data related to the program. The memory may include at least one of read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), and flash memory. All or a portion of the memory may be contained within the processor.

[0063] In the UE 100 configured in this manner, the receiver 112 receives, from the base station 200, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether or not to apply a transform precoder. The controller 120 of the UE 100 determines a target frequency resource that is the target of the transform precoder information. The controller 120 determines, based on the transform precoder information, whether or not to apply a transform precoder to transmission of an uplink signal in the target frequency resource. This allows the UE 100 to dynamically switch and transmit the waveform of an uplink signal in the target frequency resource that is the target of the transform precoder information.

[0064] Furthermore, the receiving unit 112 receives, from the base station 200, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether or not to apply a transform precoder. The control unit 120 determines which of the following parameters to use for the parameters set for the target of the transform precoder information: a first parameter used when a transform precoder is applied, or a second parameter used when a transform precoder is not applied. As a result, the UE 100 can switch parameters related to the application of a transform precoder by determining either the first parameter or the second parameter for the parameters set for the target of the transform precoder information included in the DCI or MAC CE, thereby enabling dynamic parameter switching.

[0065] (Configuration of Base Station) The configuration of the base station 200 according to this embodiment will be described with reference to Fig. 5. The base station 200 includes a communication unit 210, a network communication unit 220, and a control unit 230.

[0066] The communication unit 210 receives, for example, a radio signal from the UE 100 and transmits the radio signal to the UE 100. The communication unit 210 has at least one transmission unit 211 and at least one reception unit 212. The transmission unit 211 and the reception unit 212 may be configured to include an RF circuit. The RF circuit performs analog processing of signals transmitted and received via an antenna. The RF circuit may include a high-frequency filter, an amplifier, a modulator, a low-pass filter, etc.

[0067] The network communication unit 220 transmits and receives signals to and from the network. For example, the network communication unit 220 receives signals from adjacent base stations connected via an Xn interface, which is an interface between base stations, and transmits the signals to the adjacent base stations. The network communication unit 220 also receives signals from the core network device 300 connected via an NG interface, and transmits the signals to the core network device 300.

[0068] The control unit 230 performs various controls in the base station 200. The control unit 230 controls, for example, communication with the UE 100 via the communication unit 210. The control unit 230 also controls, for example, communication with a node (e.g., a neighboring base station, the core network device 300) via the network communication unit 220. The operations of the base station 200 described above and below may be controlled by the control unit 230. The control unit 230 may include at least one processor capable of executing a program and a memory that stores the program. The processor may execute the program to perform the operations of the control unit 230. The control unit 230 may include a digital signal processor that performs digital processing of signals transmitted and received via the antenna and the RF circuit. The digital processing includes processing of a RAN protocol stack. The memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. All or a part of the memory may be included in the processor.

[0069] In the base station 200 configured in this manner, the control unit 230 determines a target frequency resource to be targeted by transform precoder information indicating whether or not to apply a transform precoder. The transmission unit 211 transmits downlink control information (DCI) or a medium access control element (MAC CE) including the transform precoder information to the UE 100. This allows the UE 100 to dynamically switch the waveform of an uplink signal in the target frequency resource targeted by the transform precoder information and transmit the signal. The base station 200 can receive the uplink signal whose waveform has been dynamically switched.

[0070] (Operation Example) With reference to FIG. 6, an operation example of the mobile communication system 1 will be described.

[0071] Step S101: The transmitter 111 of the UE 100 may transmit capability information indicating the capability of the UE 100 used to determine the predetermined time, which will be described later, to the base station 200. The receiver 212 of the base station 200 may receive the capability information from the UE 100.

[0072] The capability information may be, for example, radio access capability for determining time resources (also referred to as resources in the time domain) for PUSCH transmission based on transform precoder information (hereinafter, TP information or first TP information) included in DCI or MAC CE. The transmitter 111 of the UE 100 may transmit, for example, a UE capability information message (UECapabilityInformation) including the capability information to the base station 200.

[0073] The control unit 230 of the base station 200 may determine timing information, which will be described later, based on the capability information from the UE 100 .

[0074] Step S102: The transmitter 211 of the base station 200 may transmit an RRC message including timing information for determining timing (appropriately referred to as predetermined timing) described below to the UE 100. The receiver 112 of the UE 100 may receive the timing information from the base station 200.

[0075] As described below, the timing information is information for determining timing (i.e., a predetermined timing) after a predetermined time has elapsed since receiving TP information included in DCI or MAC CE. The timing information may include, for example, information for determining time resources for PUSCH transmission based on the TP information. The information may indicate a slot, a symbol, and / or a start position in which PUSCH transmission is performed. For example, the timing information may be used to set (specify) a relationship between a slot, a symbol, and / or a start position in which DCI or MAC CE including TP information is received and a slot, a symbol, and / or a start position in which PUSCH transmission is performed. When the UE 100 receives DCI or MAC CE including TP information in a certain slot, a certain symbol, and / or a certain start position, the UE 100 may perform PUSCH transmission based on the certain slot, the certain symbol, and / or the certain start position and the timing information.

[0076] The timing information may include information indicating a time until a predetermined timing based on reception of the PDCCH. The timing information may include information indicating an offset value from a reference value for normal PUSCH transmission, or may include information indicating an offset value from timing offset from the reference value for normal PUSCH transmission. The timing information may include information indicating a validity period of the transform precoder information.

[0077] The transmitter 211 of the base station 200 may transmit an RRC message including timing information to the UE 100. The RRC message may include configuration information related to the configuration of the PUSCH. The configuration information may include timing information that is applied individually to the configuration information. The timing information may include information that is common to multiple types of configuration information related to the PUSCH. The multiple types of configuration information may include, for example, at least one of PUSCH-config, ConfiguredGrantConfig, RACH-ConfigCommon, and MsgA-PUSCH-Config.

[0078] Furthermore, the transmitting unit 211 of the base station 200 may transmit an RRC message including target designation information that designates a target frequency resource (described later) to the UE 100. The receiving unit 112 of the UE 100 may receive the target designation information from the base station 200. The frequency resource is also referred to as a resource in the frequency domain.

[0079] The target designation information may include information designating a serving cell. The target designation information may include information designating a cell group. The target designation information may include information designating an uplink BWP. That is, the target designation information may include indexes of one or more cell groups, indexes of one or more serving cells, and / or indexes of one or more uplink BWPs. In this embodiment, designating may be used in the same sense as configuring.

[0080] Furthermore, the transmission unit 211 of the base station 200 may transmit an RRC message including both the first parameter and the second parameter to the UE 100. Note that the transmission unit 211 of the base station 200 may transmit the first parameter and the second parameter to the UE 100 in separate RRC messages.

[0081] The first parameter and / or the second parameter may be parameters set for a target of the transform precoder information. The first parameter is used when a transform precoder is applied. The second parameter is used when a transform precoder is not applied. The parameters (i.e., the first parameter and / or the second parameter) may be at least one of a parameter related to a sequence of demodulation reference signals (DMRS) associated with the PUSCH, a parameter related to a sequence of PTRS associated with the PUSCH, and a parameter related to determining a modulation and channel coding scheme (MCS) table.

[0082] Hereinafter, for ease of explanation, a parameter related to a sequence of DMRSs associated with a PUSCH used when a transform precoder is applied (i.e., when a transform precoder is enabled), a parameter related to a sequence of PTRSs associated with a PUSCH, and / or a parameter related to determining an MCS table will be referred to as a first parameter. However, it goes without saying that a parameter related to a sequence of DMRSs associated with a PUSCH used when a transform precoder is applied, a parameter related to a sequence of PTRSs associated with a PUSCH, and / or a parameter related to determining an MCS table may each be different parameters. For example, a parameter related to a sequence of DMRSs associated with a PUSCH used when a transform precoder is applied may be the first parameter. Furthermore, a parameter related to a sequence of PTRSs associated with a PUSCH used when a transform precoder is applied may be the third parameter. Furthermore, a parameter related to determining an MCS table used when a transform precoder is applied may be the fourth parameter.

[0083] Similarly, a parameter related to the sequence of DMRSs associated with the PUSCH, a parameter related to the sequence of PTRSs associated with the PUSCH, and / or a parameter related to determining an MCS table used when a transform precoder is not applied (i.e., when a transform precoder is disabled) is referred to as a second parameter. However, it goes without saying that the parameter related to the sequence of DMRSs associated with the PUSCH, a parameter related to the sequence of PTRSs associated with the PUSCH, and / or a parameter related to determining an MCS table used when a transform precoder is not applied may be different parameters. For example, the parameter related to the sequence of DMRSs associated with the PUSCH used when a transform precoder is not applied may be the second parameter. Furthermore, the parameter related to the sequence of PTRSs associated with the PUSCH used when a transform precoder is not applied may be the fifth parameter. Furthermore, the parameter related to determining an MCS table used when a transform precoder is not applied may be the sixth parameter.

[0084] Step S103: The transmitter 211 of the base station 200 transmits DCI or MAC CE including the TP information to the UE 100. The receiver 112 of the UE 100 receives the DCI or MAC CE including the TP information from the base station 200. The TP information indicates whether or not to apply a transform precoder. For example, the TP information may be information indicating whether or not to apply a transform precoder to the corresponding PUSCH transmission. That is, the TP information may be information indicating whether the transform precoder is enabled or disabled. The TP information may also include target designation information.

[0085] The transmitter 211 may transmit DCI including TP information. Therefore, the transmitter 211 may transmit the TP information by a physical layer (i.e., L1 signaling). For example, the transmitter 211 may transmit the DCI including the TP information on a PDCCH. Furthermore, the transmitter 211 may transmit a MAC CE including the TP information on a PDSCH.

[0086] The DCI including the TP information may be a DCI format including the TP information. Note that the DCI indicating whether or not to apply a transform precoder may be the TP information. The DCI format including the TP information may be a DCI format used for scheduling the PDSCH, a DCI format used for scheduling the PUSCH, and / or a DCI format not used for scheduling the PDSCH / PUSCH. A CRC parity bit scrambled by the C-RNTI, CS-RNTI, and / or MCS-C-RNTI may be added to the DCI format including the TP information.

[0087] Furthermore, the DCI including the TP information may be included in a PDCCH order. The PDCCH order may be used to initiate a random access (RA) procedure. A random access procedure initiated (or indicated) by a PDCCH order is also referred to as a contention-free random access (CFRA) procedure. For example, a four-step CFRA procedure or a two-step CFRA procedure may be initiated by a PDCCH order. Furthermore, if the CRC of DCI format 1_0 is scrambled by the C-RNTI and the frequency domain resource allocation field (i.e., the frequency domain resource allocation field) is all "1", DCI format 1_0 may be used for an RA procedure initiated by a PDCCH order.

[0088] Here, DCI format 1_0 (for example, DCI format 1_0 to which a CRC scrambled by the C-RNTI is added) may be used for scheduling the PDSCH. That is, when the values ​​of the frequency domain resource allocation fields included in DCI format 1_0 are all set to "1", DCI format 1_0 may be identified as a DCI format for a PDCCH order. Furthermore, when any of the values ​​of the frequency domain resource allocation fields included in DCI format 1_0 is set to a value other than "1", DCI format 1_0 may be identified as a DCI format used for scheduling the PDSCH.

[0089] For example, when DCI format 1_0 is used as a DCI format for a PDCCH order, DCI format 1_0 may include information indicating a random access preamble. In an RA procedure initiated by a PDCCH order, UE 100 may transmit the random access preamble. Furthermore, when DCI format 1_0 is used as a DCI format for a PDCCH order, DCI format 1_0 may include information indicating an index of an SS / PBCH (Synchronization signal and / or Physical Broadcast channel). Here, when DCI format 1_0 is used as a DCI format for a PDCCH order, DCI format 1_0 may include TP information (which may be a DCI including TP information). For example, a reserved bit of DCI format 1_0 for a PDCCH order may be used as the TP information.

[0090] The transmitter 211 of the base station 200 may transmit an RRC message including information related to the field of the TP information (which may be DCI including the TP information) to the UE 100. The information may be information indicating the presence or absence of the TP information field in the DCI (or DCI format) and / or information used to determine the number of bits of the field. The control unit 120 of the UE 100 may determine (determine, identify) whether or not the TP information is included in the DCI (i.e., whether or not the TP information is present in the DCI) based on the information.

[0091] Furthermore, the transmission unit 211 of the base station 200 may transmit to the UE 100 an RRC message including configuration information for monitoring a PDCCH for a DCI (or a DCI format) including TP information. The configuration information may include information for configuring a control resource set (e.g., CORESET(s)) for monitoring a PDCCH for a DCI (or a DCI format) including TP information, and / or information for configuring a search space set (Search Space Set(s)) for monitoring a PDCCH for a DCI (or a DCI format) including TP information. The control unit 120 of the UE 100 may determine that the DCI received in the configured control resource set and / or search space set includes TP information. For example, the search space set includes a UE-specific search space set (also referred to as a USS set) and / or a common search space set (also referred to as a CSS set).

[0092] The transmitter 211 may transmit the TP information including the MAC CE. Therefore, the transmitter 211 may transmit the TP information in the MAC layer.

[0093] A MAC CE including TP information may be defined. The MAC CE may include the TP information and a specific logical channel identifier (LCID) for identifying the MAC CE including the TP information. The control unit 120 of the UE 100 may determine whether the MAC CE includes the TP information based on the specific LCID.

[0094] The DCI or MAC CE may include targeting information. The MAC CE may include TP information and targeting information. The targeting information may include one or more cell group indices, one or more serving cell indices, and / or one or more uplink BWP indices.

[0095] In this specification, the TP information included in the DCI or MAC CE may be referred to as the first TP information. The TP information included in the RRC message may be referred to as the second TP information. In the following description, the TP information will be referred to as the first TP information unless otherwise specified.

[0096] Step S104: The control unit 120 of the UE 100 determines a target of the TP information. The control unit 120 determines a target frequency resource to be the target of the TP information. The target frequency resource may be at least one of a cell group, a serving cell, and a bandwidth portion (e.g., an uplink bandwidth portion (UL BWP)). That is, the control unit 120 of the UE 100 may determine a cell group, a serving cell, and / or a bandwidth portion (e.g., an uplink bandwidth portion (UL BWP)) to which the TP information applies. Furthermore, the control unit 120 of the UE 100 may apply the TP information to transmission of an uplink signal in the cell group, the serving cell, and / or the bandwidth portion (e.g., an uplink bandwidth portion (UL BWP)).

[0097] Furthermore, the control unit 120 may determine all configured serving cells and / or all uplink BWPs as target frequency resources. For example, the control unit 120 may determine all configured serving cells for the UE 100 and / or all configured uplink BWPs for the UE 100 as target frequency resources. Here, one or more uplink BWPs may be configured in a certain serving cell. For example, the base station may transmit an RRC message including information for configuring one or more uplink BWPs in each of one or more serving cells.

[0098] Furthermore, the control unit 120 may determine the target frequency resource based on the target designation information. When the target designation information includes information specifying a serving cell, the control unit 120 may determine a designated serving cell from among serving cells configured for the UE 100 as the target frequency resource. When the target designation information includes information specifying a cell group, the control unit 120 may determine a designated cell group from among cell groups configured for the UE 100 as the target frequency resource. The cell group may be a master cell group and / or a secondary cell group. When the target designation information includes information specifying an uplink BWP, the control unit 120 may determine a designated uplink BWP from among uplink BWPs configured for the UE 100 as the target frequency resource. The control unit 120 may apply TP information to transmission of an uplink signal in the target frequency resource determined based on the target designation information.

[0099] Furthermore, when the DCI is a DCI format including TP information, the control unit 120 may determine at least one of a serving cell and / or an uplink BWP scheduled using the DCI format as the target frequency resource. That is, when the control unit 120 receives a DCI format including TP information, the control unit 120 may determine, as the target frequency resource, a serving cell and / or an uplink BWP scheduled using the DCI format including the TP information. For example, when the control unit 120 receives a DCI format including TP information, the control unit 120 may determine, as the target frequency resource, a serving cell to which a PUSCH resource scheduled using the DCI format including the TP information is assigned and / or an uplink BWP. The control unit 120 may apply the TP information to the transmission of an uplink signal in the target frequency resource.

[0100] Furthermore, when the DCI is a DCI format including TP information, the control unit 120 may determine, as the target frequency resource, an uplink component carrier corresponding to the downlink component carrier on which the DCI format is received and / or an uplink BWP corresponding to the downlink BWP on which the DCI format is received. For example, the control unit 120 may determine, as the target frequency resource, an uplink BWP corresponding to the downlink BWP on which the DCI including TP information is detected (e.g., an uplink BWP with the same index as the downlink BWP index). That is, when the control unit 120 receives a DCI format including TP information, it may determine, as the target frequency resource, a serving cell (uplink serving cell) on which the DCI format including the TP information is detected. As described above, the DCI format including TP information includes a DCI format for a PDCCH order.

[0101] Furthermore, the control unit 120 may determine the activated uplink BWP as the target frequency resource.

[0102] Step S105: The control unit 120 of the UE 100 determines whether to apply a transform precoder to transmission of an uplink signal (e.g., PUSCH transmission) in the target frequency resource. The control unit 120 determines whether to apply a transform precoder based on the TP information.

[0103] When the TP information indicates that a transform precoder is to be applied, the control unit 120 may determine that a transform precoder is to be applied to the transmission of an uplink signal in the target frequency resource. On the other hand, when the TP information indicates that a transform precoder is not to be applied, the control unit 120 may determine that a transform precoder is not to be applied to the transmission of an uplink signal in the target frequency resource.

[0104] When the control unit 120 receives an RRC message including second TP information from the base station 200, the control unit 120 may select the TP information to be used in determining whether to apply a transform precoder from the first TP information and the second TP information. That is, when the control unit 120 receives the first TP information and the second TP information, the control unit 120 may determine whether to apply a transform precoder based on one of the first TP information and the second TP information. For example, when the control unit 120 receives the first TP information, the control unit 120 may determine whether to apply a transform precoder based on the first TP information even if the second TP information is set (regardless of whether the second TP information is set). Furthermore, when the second TP information is set, the control unit 120 may determine whether to apply a transform precoder based on the second TP information even if the first TP information is received (regardless of whether the first TP information is received).

[0105] The control unit 120 may select the first TP information when the second TP information is included in at least one of configuration information for configuring communication device-specific PUSCH parameters applicable to a specific bandwidth portion (uplink BWP) and / or configuration information for configuring uplink transmission without dynamic grant. That is, in this case, the control unit 120 may determine whether to apply a transform precoder based on the first TP information. For example, the control unit may select the first TP information instead of the second TP information included in PUSCH-config and / or ConfiguredGrantConfig.

[0106] When the second TP information is included in the configuration information related to the random access procedure, the control unit 120 may select the second TP information. That is, in this case, the control unit 120 may determine whether to apply a transform precoder based on the second TP information. The configuration information related to the random access procedure may be RACH-ConfigCommon and / or MsgA-PUSCH-Config.

[0107] That is, when whether to apply a transform precoder is set based on the second TP information included in PUSCH-config and / or ConfiguredGrantConfig and whether to apply a transform precoder is instructed based on the first TP information, the control unit 120 may determine whether to apply a transform precoder according to the first TP information. For example, the instruction to apply a transform precoder based on the first TP information may overwrite the setting to apply a transform precoder based on the second TP information. Furthermore, when whether to apply a transform precoder is set based on the second TP information included in RACH-ConfigCommon and / or MsgA-PUSCH-Config and whether to apply a transform precoder is instructed based on the first TP information, the control unit 120 may determine whether to apply a transform precoder according to the second TP information. For example, an instruction for applying a transform precoder based on the first TP information may not overwrite a setting for applying a transform precoder based on the second TP information (the setting for applying a transform precoder based on the second TP information may be maintained). Here, the control unit 120 may select the first TP information instead of the second TP information included in PUSCH-config, ConfiguredGrantConfig, RACH-ConfigCommon, and / or MsgA-PUSCH-Config. In other words, when whether to apply a transform precoder is set based on the second TP information included in PUSCH-config, ConfiguredGrantConfig, RACH-ConfigCommon, and / or MsgA-PUSCH-Config, and whether to apply a transform precoder is instructed based on the first TP information, the control unit 120 may always decide whether to apply a transform precoder according to the first TP information.

[0108] The control unit 120 switches whether to apply a transform precoder based on the TP information. When the control unit 120 determines, based on the TP information, to apply a transform precoder in a case where the transform precoder is not applied to the transmission of an uplink signal in the target frequency resource, the control unit 120 controls to switch to using a DFT-s-OFDM waveform. On the other hand, when the control unit 120 determines, based on the TP information, not to apply a transform precoder in a case where the transform precoder is applied to the transmission of an uplink signal in the target frequency resource, the control unit 120 controls to switch to using a CP-OFDM waveform.

[0109] The control unit 120 may determine parameters to be used for transmitting uplink signals based on the TP information. Specifically, the control unit 120 determines, for parameters set for a target of the transform precoder information, whether to use a first parameter used when a transform precoder is applied (i.e., when the transform precoder is enabled) or a second parameter used when a transform precoder is not applied (i.e., when the transform precoder is disabled). The control unit 120 uses the determined parameters, for example, as parameters related to a sequence of DMRSs associated with a PUSCH (which may be PUSCH transmission), parameters related to a sequence of PTRSs associated with a PUSCH (which may be PUSCH transmission), and / or parameters related to determining an MCS (Modulation and Channel Coding Scheme) table. Here, the parameters related to determining an MCS table may include parameters related to determining an MCS table associated with a PUSCH transmission.

[0110] The control unit 120 may use either the first parameter or the second parameter based on whether a transform precoder is applied (i.e., based on whether the transform precoder is enabled or disabled). For example, the control unit 120 may use the first parameter when a transform precoder is applied (i.e., when the transform precoder is enabled). Furthermore, the control unit 120 may use the second parameter when a transform precoder is not applied (i.e., when the transform precoder is disabled). That is, the control unit 120 may determine whether the first parameter or the second parameter is to be used based on the TP information and generate a sequence of DMRSs associated with the PUSCH using the determined parameter. Furthermore, the control unit 120 may determine whether the first parameter or the second parameter is to be used based on the TP information and generate a sequence of PTRSs associated with the PUSCH using the determined parameter. Furthermore, the control unit 120 may determine whether the first parameter or the second parameter is to be used based on the TP information and determine an MCS table using the determined parameter. Here, the control unit 120 may use a parameter (first parameter or second parameter) related to the target resource determined as the target of the TP information. For example, when the first parameter and / or the second parameter are set for each of one or more uplink BWPs, the control unit 120 may use the first parameter and / or the second parameter set for the target resource to which the TP information applies (i.e., the uplink BWP to which the TP information applies among the one or more uplink BWPs).

[0111] Here, the control unit 120 may suspend (or reserve or temporarily suspend) the unused parameter out of the first parameter and the second parameter. That is, the control unit 120 may use one of the first parameter and the second parameter and suspend the other based on whether a transform precoder is applied (i.e., based on whether the transform precoder is enabled or disabled). For example, the control unit 120 may use the first parameter and suspend the second parameter when a transform precoder is applied. Furthermore, the control unit 120 may use the second parameter and suspend the first parameter when a transform precoder is not applied. Here, the control unit 120 may suspend parameters other than the parameter (the first parameter or the second parameter) related to the target resource determined as the target of the TP information. For example, when the first parameter and / or the second parameter are set for each of one or more uplink BWPs, the control unit 120 may use the first parameter and / or the second parameter set for the target resource to which the TP information applies (i.e., the uplink BWP to which the TP information applies among the one or more uplink BWPs), and suspend the other parameters (the first parameter and / or the second parameter). Thus, for example, the control unit 120 may consider, among the parameters set using an RRC message, parameters that correspond to the instruction of the TP information (i.e., related to the target frequency resource determined as the target of the TP information) to be active, and may suspend parameters that do not correspond to the TP information (i.e., not targeted by the TP information).

[0112] For example, if the control unit 120 has an active transform precoder configuration and has not received an indication that the transform precoder configuration is disabled, the transform precoder configuration may be considered active for the active BWP; otherwise, the transform precoder configuration may be considered suspended. The transform precoder configuration may correspond to whether to apply a transform precoder (i.e., whether to enable or disable the transform precoder). The transform precoder configuration may also include either a first parameter or a second parameter.

[0113] For example, as described above, when the enablement of a transform precoder is instructed (or set), the control unit 120 may use the first parameters set for the uplink BWP to which the transform precoder is applied (i.e., the active BWP in which the uplink signal is executed) (the first parameters may be considered to be active). Furthermore, when the enablement of a transform precoder is instructed (or set), the control unit 120 may not use the second parameters set for the uplink BWP to which the transform precoder is applied (i.e., the active BWP in which the uplink signal is executed) (the second parameters may be considered to be suspended).

[0114] Furthermore, when the disablement of a transform precoder is instructed (or set), the control unit 120 may not use the first parameters set for the uplink BWP to which the transform precoder is not applied (i.e., the active BWP in which the uplink signal is executed) (the first parameters may be considered to be suspended). Furthermore, when the disablement of a transform precoder is instructed (or set), the control unit 120 may use the second parameters set for the uplink BWP to which the transform precoder is not applied (i.e., the active BWP in which the uplink signal is executed) (the second parameters may be considered to be active).

[0115] Step S106: The transmitter 111 of the UE 100 may transmit an uplink signal (e.g., a PUSCH) to the base station 200. The receiver 212 of the base station 200 may receive the uplink signal from the UE 100. For example, if the control unit 120 determines to apply a transform precoder (i.e., if activation of the transform precoder is instructed (or set)), the transmitter 111 transmits an uplink signal to which the transform precoder is applied in a target frequency resource. Also, if the control unit 120 generates a sequence of DMRS associated with a PUSCH using the first parameter, the transmitter 111 may transmit the DMRS associated with the PUSCH. Here, the transmitter 111 may transmit the DMRS associated with the PUSCH in a target frequency resource to which the TP information is applied. Furthermore, when the control unit 120 generates a sequence of PTRSs associated with the PUSCH using the first parameter, the transmitting unit 111 may transmit the PTRSs associated with the PUSCH. Here, the transmitting unit 111 may transmit the PTRSs associated with the PUSCH in a target frequency resource to which the TP information is applied. Furthermore, when the control unit 120 determines an MCS table using the first parameter, the transmitting unit 111 may perform transmission on the PUSCH in accordance with the MCS table. Here, the transmitting unit 111 may perform transmission on the PUSCH in accordance with the MCS table in a target frequency resource to which the TP information is applied.

[0116] Furthermore, when the control unit 120 determines not to apply a transform precoder, the transmission unit 111 transmits an uplink signal to which a transform precoder is not applied in the target frequency resource. Furthermore, when the control unit 120 generates a sequence of DMRSs associated with a PUSCH using the second parameter, the transmission unit 111 may transmit the DMRSs associated with the PUSCH. Here, the transmission unit 111 may transmit the DMRSs associated with the PUSCH in the target frequency resource to which the TP information is applied. Furthermore, when the control unit 120 generates a sequence of PTRSs associated with a PUSCH using the second parameter, the transmission unit 111 may transmit the PTRSs associated with the PUSCH. Here, the transmission unit 111 may transmit the PTRSs associated with the PUSCH in the target frequency resource to which the TP information is applied. Furthermore, when the control unit 120 determines an MCS table using the second parameter, the transmission unit 111 may perform transmission on the PUSCH in accordance with the MCS table. Here, the transmitting unit 111 may perform transmission on the PUSCH in accordance with the MCS table in the target frequency resource to which the TP information is applied.

[0117] The transmitting unit 111 may transmit an uplink signal to which switching regarding the application of the transform precoder has been applied to the base station 200 at a timing (predetermined timing) after a predetermined time has elapsed since receiving the transform precoder information (e.g., DCI including TP information).

[0118] The control unit 120 may determine the predetermined timing based on timing information. For example, the control unit 120 may determine, as the predetermined timing, a timing that is later than the transmission timing of a normal uplink signal (normal offset timing) (for example, a slot after a predetermined slot in which a normal uplink signal should be transmitted). Alternatively, the control unit 120 may determine the predetermined timing based on capability information.

[0119] Note that the control unit 120 may restore the application of the transform precoder based on information indicating the validity period of the TP information. That is, when the validity period of the TP information has expired, the control unit 120 may restore the switching of the application of the transform precoder.

[0120] Furthermore, the control unit 120 may initiate (or trigger, execute) a random access procedure based on reception of a DCI or MAC CE including TP information. For example, the control unit 120 may initiate a contention-free random access (CFRA) procedure and / or a contention-based random access (CBRA) procedure based on reception of a DCI or MAC CE including TP information. For example, the control unit 120 may initiate a four-step CFRA procedure and / or a two-step CFRA procedure based on reception of a DCI or MAC CE including TP information. Furthermore, the control unit 120 may initiate a four-step CBRA procedure and / or a two-step CBRA procedure based on reception of a DCI or MAC CE including TP information. As described above, the control unit 120 may initiate a CFRA procedure based on receiving a DCI format for a PDCCH order that includes TP information.

[0121] Here, the random access procedure may be executed in a higher layer (e.g., MAC layer) in UE 100. That is, when a lower layer (e.g., physical layer) in UE 100 receives DCI including TP information, the lower layer (e.g., physical layer) may provide (or instruct) the TP information (or may be DCI including the TP information) to a higher layer (e.g., MAC layer). Furthermore, the higher layer (e.g., MAC layer) in UE 100 may start the random access procedure based on the provision of the TP information from the physical layer.

[0122] The base station 200 may configure (or indicate) a random access preamble and physical random access channel (PRACH) resources (e.g., resources in the frequency domain and / or resources in the time domain) used in the random access procedure. Hereinafter, the physical random access channel resources will also be referred to as PRACH opportunities (occasion(s)). For example, the base station 200 may transmit an RRC message including information indicating the random access preamble and / or information indicating the PRACH opportunity. For example, the base station 200 may transmit a random access configuration (e.g., RACH-ConfigDedicated) including information indicating the random access preamble and / or information indicating the PRACH opportunity. Furthermore, as described above, the base station 200 may transmit a DCI format for a PDCCH order including information indicating the random access preamble. That is, the base station 200 may configure a random access preamble and / or a PRACH opportunity for a random access procedure initiated based on the reception of the TP information.

[0123] The UE 100 transmits a random access preamble (also referred to as message 1 or message A) based on the start of the random access procedure. Furthermore, the UE 100 may perform transmission on the PUSCH after transmitting the random access preamble in the two-step RA procedure. Here, the UE 100 may determine whether to apply a transform precoder to transmission on the PUSCH after transmitting the random access preamble based on TP information. For example, the UE 100 may apply a transform precoder to transmission on the PUSCH after transmitting the random access preamble based on the TP information. Furthermore, the UE 100 may not apply a transform precoder to transmission on the PUSCH after transmitting the random access preamble based on the TP information. The base station 200 may set timing information for transmission on the PUSCH after transmitting the random access preamble. For example, the base station 200 may transmit an RRC message including timing information, and the UE 100 may perform transmission on the PUSCH after transmitting the random access preamble based on the timing information. That is, the UE 100 may determine timing (e.g., slot, symbol, and / or start position) for transmission on the PUSCH after transmitting the random access preamble based on the timing information. For example, the base station 200 may transmit a random access configuration (e.g., RACH-ConfigDedicated) including the timing information.

[0124] Furthermore, the UE 100 receives a random access response (RA response) (also referred to as message 2 or message B). For example, the UE 100 may monitor a DCI (which may be a PDCCH) to which a CRC scrambled by the C-RNTI is attached in order to receive the random access response (i.e., receive a random access response on the PDSCH). Here, the base station 200 may transmit an RRC message including information indicating a DC monitored time window (also referred to as an ra-ResponseWindow) to which a CRC scrambled by the C-RNTI is attached and / or information indicating a search space set. Here, the search space set includes a USS set and / or a CSS set. That is, the base station 200 may configure a search space set and / or information indicating a time window for the random access procedure initiated based on the reception of the TP information. For example, base station 200 may transmit an RRC message including information indicating a time window and / or information indicating a search space set, and UE 100 may monitor DCI to which a CRC with a scrambled C-RNTI is attached in the time window and / or the search space set. UE 100 may determine that the random access procedure has been successfully completed based on reception (or detection) of DCI to which a CRC with a scrambled C-RNTI is attached.

[0125] Furthermore, the UE 100 may apply a transform precoder in accordance with the TP information based on the successful completion of the random access procedure. Furthermore, the UE 100 may not apply a transform precoder in accordance with the TP information based on the successful completion of the random access procedure. That is, the UE 100 may transmit an uplink signal in accordance with the TP information based on the successful completion of the random access procedure. Here, the base station 200 may set timing information for the transmission of an uplink signal based on the successful completion of the random access procedure. For example, the base station 200 may transmit an RRC message including timing information, and the UE 100 may transmit an uplink signal in accordance with the TP information after the successful completion of the random access procedure. For example, the UE 100 may transmit an uplink signal in accordance with the TP information after the successful completion of the random access procedure and after the time timing indicated by the timing information.

[0126] Furthermore, the UE 100 may execute transmission of an uplink signal according to the TP information after processing the timing advance command. For example, the UE 100 may execute transmission of an uplink signal according to the TP information after processing the timing advance command included in the random access response.

[0127] Furthermore, in the four-step CBRA procedure, the UE 100 may perform transmission in the PUSCH (which may be transmission of the UL-SCH) based on the random access response. For example, the UE 100 may perform transmission in the PUSCH based on a random access response grant (RA response grant) included in the random access response (also referred to as message 3). For example, the UE 100 may apply a transform precoder to the transmission in the PUSCH based on TP information. Furthermore, the UE 100 may not apply a transform precoder to the transmission in the PUSCH based on the TP information. The base station 200 may set timing information for the transmission in the PUSCH. For example, the base station 200 may transmit an RRC message including timing information, and the UE 100 may perform transmission in the PUSCH based on the timing information. That is, the UE 100 may determine the timing of transmission in the PUSCH (e.g., slot, symbol, and / or start position) based on the timing information. For example, the base station 200 may transmit a random access configuration (e.g., RACH-ConfigDedicated) including timing information. Also, the base station 200 may transmit the timing information by including it in a random access response.

[0128] Furthermore, in the four-step CBRA procedure, the UE 100 may receive contention resolution (also referred to as message 4). For example, the UE 100 may determine that the random access procedure has been successfully completed based on the contention resolution reception (or detection). As described above, the UE 100 may apply a transform precoder in accordance with the TP information based on the successful completion of the random access procedure. Furthermore, the UE 100 may not apply a transform precoder in accordance with the TP information based on the successful completion of the random access procedure. That is, the UE 100 may transmit an uplink signal based on the TP information based on the successful completion of the random access procedure. Furthermore, the base station 200 may configure timing information for the transmission of an uplink signal based on the successful completion of the random access procedure. For example, the base station 200 may transmit an RRC message including timing information, and the UE 100 may transmit an uplink signal based on the timing information after the random access procedure is successfully completed. For example, the UE 100 may transmit an uplink signal after the random access procedure is successfully completed and a time timing indicated by the timing information has elapsed.

[0129] As described above, the receiver 112 of the UE 100 receives, from the base station 200, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether or not to apply a transform precoder. The control unit 120 of the UE 100 determines a target frequency resource targeted by the transform precoder information. The control unit 120 determines, based on the transform precoder information, whether or not to apply a transform precoder to transmission of an uplink signal in the target frequency resource. This allows the UE 100 to dynamically switch the waveform of an uplink signal in the target frequency resource targeted by the transform precoder information and transmit the signal. This allows the UE 100 to dynamically switch the waveform of an uplink signal in the target frequency resource targeted by the transform precoder information and transmit the signal. The base station 200 can receive an uplink signal whose waveform has been dynamically switched.

[0130] Furthermore, the control unit 120 determines, as target frequency resources, all serving cells configured for the UE 100 or all uplink BWPs configured for the UE 100. As a result, the UE 100 determines that the configured ones are targets of the TP information, and therefore the target frequency resources can be commonly recognized between the base station 200 and the UE 100 even without exchanging target designation information.

[0131] Furthermore, the receiving unit 112 may receive target designation information that designates a target frequency resource from the base station 200. The control unit 120 may determine the target frequency resource based on the target designation information. This allows the base station 200 and the UE 100 to share recognition of the target frequency resource.

[0132] Furthermore, the target designation information may include information designating a serving cell as the target frequency resource. Based on the target designation information, the control unit 120 may determine a designated serving cell among serving cells configured for the UE 100 as the target frequency resource. This allows for flexible control of the serving cell that is the target of the TP information even when multiple serving cells are configured for the UE 100.

[0133] Furthermore, the target designation information may include information designating a cell group as the target frequency resource. Based on the target designation information, the control unit 120 may determine, as the target frequency resource, a designated cell group among the cell groups set for the UE 100. Even when a plurality of cell groups are set for the UE 100, the cell group that is the target of the TP information can be flexibly controlled.

[0134] Furthermore, the target designation information may include information designating an uplink BWP as the target frequency resource. Based on the target designation information, the control unit 120 can determine, as the target frequency resource, a designated uplink BWP from among the uplink BWPs configured for the UE 100. Even when multiple uplink BWPs are configured for the UE 100, the uplink BWP that is the target of the TP information can be flexibly controlled.

[0135] Furthermore, the receiving unit 112 may receive a radio resource control (RRC) message including target designation information from the base station 200. As a result, the RRC message can transmit a larger amount of information than the DCI and MAC CE, making it easier to flexibly designate the target of the TP information.

[0136] Furthermore, the receiver 112 may receive a MAC CE including target designation information from the base station 200. This makes it possible to dynamically switch the target of the TP information compared to RRC signaling.

[0137] Furthermore, the MAC CE may receive a MAC CE including the TP information and target designation information from the base station 200. This allows the UE 100 to immediately grasp the target of the TP information.

[0138] Furthermore, the DCI may be a DCI format including TP information. The control unit 120 may determine at least one of a serving cell and an uplink BWP scheduled using the DCI format as a target frequency resource. This allows the UE 100 to grasp the target of the TP information even if the target of the TP information is not explicitly specified.

[0139] Furthermore, the DCI may be a DCI format including TP information. The control unit 120 may determine, as the target frequency resource, an uplink component carrier corresponding to a downlink component carrier on which the DCI format is received or an uplink BWP corresponding to a downlink BWP on which the DCI format is received. This allows the UE 100 to grasp the target of the TP information even if the target of the TP information is not explicitly specified.

[0140] Furthermore, the TP information may be first TP information. The receiving unit 112 may receive, from the base station, a radio resource control (RRC) message including second TP information indicating whether to apply a transform precoder. The control unit 120 may select, from the first TP information and the second TP information, the TP information to be used for determining whether to apply a transform precoder. This allows for flexible control of the application of a transform precoder using the first TP information and the second TP information.

[0141] Furthermore, the control unit 120 may select the first TP information when the second TP information is included in at least one of configuration information for configuring communication device-specific physical uplink shared channel (PUSCH) parameters applicable to a specific bandwidth portion (BWP) and configuration information for configuring uplink transmission without dynamic permission. That is, when the control unit 120 receives communication device-specific parameters including the second TP information (i.e., when the second TP information is configured as communication device-specific parameters), the control unit 120 may determine whether to apply a transform precoder based on the first TP information. Regarding this configuration information, the base station 200 can switch whether to apply a transform precoder at appropriate timing using lower layer signaling. Furthermore, the base station 200 can perform efficient transform precoder switching specific to the communication device.

[0142] Furthermore, when the second TP information is included in the configuration information related to the random access procedure, the control unit 120 may select the second TP information. That is, when the control unit 120 receives cell-specific parameters including the second TP information (that is, when the second TP information is set as a cell-specific parameter), the control unit 120 may determine whether to apply a transform precoder based on the second TP information. This allows the base station 200 to switch to an optimal transform precoder taking into account the situation of the entire cell.

[0143] Furthermore, the receiving unit 112 may receive a radio resource control (RRC) message including information on a field in the DCI including the TP information from the base station 200. This allows the UE 100 to know whether or not the DCI includes the TP information.

[0144] Furthermore, the receiving unit 112 may receive a radio resource control (RRC) message including configuration information for monitoring DCI including TP information from the base station 200. This allows the UE 100 to grasp whether or not TP information is included in the DCI. Furthermore, the UE 100 can control a control resource set (i.e., resources in the frequency domain) and / or a search space set (i.e., resources in the time domain) for monitoring DCI including TP information.

[0145] Furthermore, the receiving unit 112 may receive a MAC CE including the TP information and a specific logical channel identifier for identifying the MAC CE including the TP information from the base station 200. This allows the UE 100 to know whether or not the MAC CE includes the TP information.

[0146] Furthermore, the receiving unit 112 receives, from the base station 200, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether or not to apply a transform precoder. The control unit 120 determines which of the following parameters to use for the parameters set for the target of the transform precoder information: a first parameter used when a transform precoder is applied, or a second parameter used when a transform precoder is not applied. As a result, the UE 100 can switch parameters related to the application of a transform precoder by determining either the first parameter or the second parameter for the parameters set for the target of the transform precoder information included in the DCI or MAC CE, thereby enabling dynamic parameter switching.

[0147] The receiving unit 112 may receive an RRC message including both the first parameter and the second parameter. This allows the UE 100 to dynamically switch whether or not to apply the transform precoder by using lower layer signaling after receiving the RRC message.

[0148] The control unit 120 may suspend a parameter, of the first parameter and the second parameter, that is not used for transmitting an uplink signal. As a result, when the parameter that is not used for transmitting an uplink signal is switched to be used for transmitting an uplink signal, the control unit 120 can use the parameter without delay because the parameter is suspended.

[0149] (Other Embodiments) In the above-described embodiment, the uplink signal whose waveform is determined based on the TPI has been described using the PUSCH as an example, but this is not limiting. Similar operations may be performed for other uplink signals (e.g., PTRS, etc.) or other signals (e.g., sidelink signals, etc.).

[0150] In the above-described embodiment, an NR-based mobile communication system has been described as an example of the mobile communication system 1. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a system compliant with the TS of either LTE (Long Term Evolution) or another generation system (e.g., 6th generation) of the 3GPP standard. The base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination toward the UE 100 in LTE. The mobile communication system 1 may be a system compliant with the TS of a standard other than the 3GPP standard. The base station 200 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.

[0151] In the above-described embodiment, an NR-based mobile communication system has been described as an example of the mobile communication system 1. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a system conforming to the TS of either LTE or another generation system (e.g., 6th generation) of the 3GPP standard. The base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination for the UE 100 in LTE. The mobile communication system 1 may be a system conforming to the TS of a standard other than the 3GPP standard.

[0152] The steps in the operations of the above-described embodiments do not necessarily have to be executed in chronological order according to the order depicted in the flow diagrams or sequence diagrams. For example, the steps in the operations may be executed in an order different from that depicted in the flow diagrams or sequence diagrams, or may be executed in parallel. Some of the steps in the operations may be deleted, or additional steps may be added to the process. Furthermore, the above-described operational flows are not limited to being executed independently, but may be executed by combining two or more operational flows. For example, some steps of one operational flow may be added to another operational flow, or some steps of one operational flow may be replaced with some steps of another operational flow.

[0153] A program may be provided that causes a computer to execute each process performed by the UE 100 or the base station 200. The program may be recorded on a computer-readable medium. Using the computer-readable medium, the program can be installed on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, and may be, for example, a recording medium such as a CD-ROM (Compact Disk Read Only Memory) or a DVD-ROM (Digital Versatile Disc Read Only Memory). Furthermore, circuits that execute each process performed by the UE 100 or the base station 200 may be integrated, and at least a part of the UE 100 or the base station 200 may be configured as a semiconductor integrated circuit (chip set, SoC (System On Chip)).

[0154] In the above-described embodiments, "transmit" may mean performing processing at least one layer in a protocol stack used for transmission, or may mean physically transmitting a signal wirelessly or via a wired connection. Alternatively, "transmit" may mean a combination of performing processing at least one layer and physically transmitting a signal wirelessly or via a wired connection. Similarly, "receive" may mean performing processing at least one layer in a protocol stack used for reception, or may mean physically receiving a signal wirelessly or via a wired connection. Alternatively, "receive" may mean a combination of processing at least one layer and physically receiving a signal wirelessly or via a wired connection. Similarly, "obtain / acquire" may mean obtaining information from stored information, obtaining information from information received from another node, or obtaining information by generating the information. Similarly, the terms "based on" and "depending on / in response to" do not mean "based only on" or "depending only on," unless expressly stated otherwise. The term "based on" means both "based only on" and "based at least in part on." Similarly, the term "depending on" means both "depending only on" and "depending at least in part on." Similarly, "include" and "comprise" do not mean including only the listed items, but may mean including only the listed items or may include additional items in addition to the listed items. Similarly, in this disclosure, "or" does not mean an exclusive or, but rather a logical or. Furthermore, any reference to elements using designations such as "first," "second," etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements.Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way. In this disclosure, where articles are added by translation, such as a, an, and the in English, these articles shall include the plural unless the context clearly indicates otherwise.

[0155] Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also encompasses various modifications and equivalent modifications. In addition, various combinations and forms, including only one element, more than one element, or less than one element, are also within the scope and spirit of the present disclosure.

[0156] (Additional Notes) Additional notes will be given regarding the features of the above-described embodiment.

[0157] (Supplementary Note 1) A communication device comprising: a receiver that receives, from a base station, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether a transform precoder is to be applied; and a controller that determines, for a parameter set for a target of the transform precoder information, whether to use a first parameter that is used when the transform precoder is applied or a second parameter that is used when the transform precoder is not applied.

[0158] (Supplementary Note 2) The communication device according to Supplementary Note 1, wherein the receiving unit receives a radio resource control (RRC) message including both the first parameter and the second parameter.

[0159] (Supplementary Note 3) The communication device according to Supplementary Note 1 or 2, wherein the control unit suspends a parameter, of the first parameter and the second parameter, that is not used for transmitting an uplink signal.

[0160] (Supplementary Note 4) The communication device according to any one of Supplementary Notes 1 to 3, wherein the control unit determines a target frequency resource that is the target of the transform precoder information, and determines whether to apply the transform precoder to transmission of an uplink signal in the target frequency resource based on the transform precoder information.

[0161] (Supplementary Note 5) The communication device according to Supplementary Note 4, wherein the control unit determines, as the target frequency resources, all serving cells configured for the communication device or all uplink bandwidth portions (BWPs) configured for the communication device.

[0162] (Supplementary Note 6) The communication device according to Supplementary Note 4 or 5, wherein the receiving unit receives target designation information that designates the target frequency resource from the base station, and the control unit determines the target frequency resource based on the target designation information.

[0163] (Supplementary Note 7) The communication device according to Supplementary Note 6, wherein the target designation information includes information designating a serving cell as the target frequency resource, and the control unit determines, based on the target designation information, the designated serving cell from among serving cells configured for the communication device as the target frequency resource.

[0164] (Supplementary Note 8) The communication device according to Supplementary Note 6 or 7, wherein the target designation information includes information designating a cell group as the target frequency resource, and the control unit determines, based on the target designation information, the designated cell group from among the cell groups set for the communication device as the target frequency resource.

[0165] (Supplementary Note 9) The communication device according to any one of Supplementary Notes 6 to 8, wherein the target designation information includes information designating an uplink BWP as the target frequency resource, and the control unit determines, based on the target designation information, the designated uplink BWP from among uplink BWPs configured for the communication device as the target frequency resource.

[0166] (Supplementary Note 10) The communication device according to any one of Supplementary Notes 6 to 9, wherein the receiving unit receives a radio resource control (RRC) message including the target designation information from the base station.

[0167] (Supplementary Note 11) The communication device according to any one of Supplementary notes 6 to 10, wherein the receiving unit receives the MAC CE including the target designation information from the base station.

[0168] (Supplementary Note 12) The communication device according to Supplementary Note 11, wherein the MAC CE receives the MAC CE including the transform precoder information and the target designation information from the base station.

[0169] (Supplementary Note 13) The communication device according to Supplementary Note 4, wherein the DCI is a DCI format including the transform precoder information, and the control unit determines, as the target frequency resource, at least one of a serving cell and an uplink BWP scheduled using the DCI format.

[0170] (Supplementary Note 14) The communication device according to Supplementary Note 4, wherein the DCI is a DCI format including the transform precoder information, and the controller determines, as the target frequency resource, an uplink component carrier corresponding to a downlink component carrier on which the DCI format is received or an uplink BWP corresponding to a downlink BWP on which the DCI format is received.

[0171] (Supplementary Note 15) A communication method executed by a communication device, comprising: receiving, from a base station, downlink control information (DCI) or a medium access control element (MAC CE) including transform precoder information indicating whether a transform precoder is to be applied; and determining, for parameters set for a target of the transform precoder information, whether to use a first parameter used when the transform precoder is to be applied or a second parameter used when the transform precoder is not to be applied.

Claims

1. A control unit (120), a receiving unit (112) for receiving from a base station (200) a radio resource control (RRC) message including information for setting one or more uplink bandwidth portions (UL BWPs) in one serving cell, a first parameter used when a transform precoder is applied to a transmission of a physical uplink shared channel (PUSCH), a second parameter used when the transform precoder is not applied to the transmission of the PUSCH, and information indicating that downlink control information (DCI) used for scheduling the PUSCH includes transform precoder information indicating whether or not the transform precoder is applied, and receiving the DCI from the base station on a physical downlink control channel (PDCCH); the first parameter and the second parameter are set for one UL BWP included in the one or more UL BWPs; The control unit is Determine that the DCI includes the transform precoder information based on information indicating that the DCI includes the transform precoder information; Determine to use the first parameter when applying the transform precoder to the transmission of the PUSCH based on the transform precoder information included in the DCI; When the transform precoder is not applied to the transmission of the PUSCH based on the transform precoder information included in the DCI, the second parameter is determined to be used. A communication device (100).

2. The first parameter and the second parameter include at least one of a parameter related to generation of a sequence of a demodulation reference signal (DMRS) related to the transmission of the PUSCH and a parameter related to determination of an MCS table used for the transmission of the PUSCH. The communication device according to claim 1 .

3. The DCI is added with a CRC scrambled by a C-RNTI or an MCS-C-RNTI.

3. A communication device according to claim 1 or 2.

4. The control unit determines a number of bits of the transform precoder information included in the DCI based on the information indicating that the DCI includes the transform precoder information.

3. A communication device according to claim 1 or 2.

5. The control unit: When the transform precoder is applied to the transmission of the PUSCH, a DFT-s-OFDM waveform is applied to the transmission of the PUSCH; When the transform precoder is not applied to the transmission of the PUSCH, a CP-OFDM waveform is applied to the transmission of the PUSCH.

3. A communication device according to claim 1 or 2.

6. A control unit (230), Transmitting a radio resource control (RRC) message to a communication device (100), the message including: information for setting one or more uplink bandwidth portions (UL BWPs) in one serving cell; a first parameter used when a transform precoder is applied to a transmission of a physical uplink shared channel (PUSCH); a second parameter used when the transform precoder is not applied to the transmission of the PUSCH; and information indicating that transform precoder information indicating whether or not the transform precoder is applied is included in downlink control information (DCI) used for scheduling the PUSCH; A transmitter (211) for transmitting the DCI to the communication device on a physical downlink control channel (PDCCH), The control unit is The first parameter and the second parameter are set for one UL BWP included in the one or more UL BWPs; Based on information indicating that the DCI includes the transform precoder information, configure that the DCI includes the transform precoder information; When the transform precoder is applied to the transmission of the PUSCH based on the transform precoder information included in the DCI, the first parameter is configured to be used; When the transform precoder is not applied to the transmission of the PUSCH based on the transform precoder information included in the DCI, the second parameter is configured to be used. Base station (200).

7. The first parameter and the second parameter include at least one of a parameter related to generation of a sequence of a demodulation reference signal (DMRS) related to the transmission of the PUSCH and a parameter related to determination of an MCS table used for the transmission of the PUSCH. The base station according to claim 6.

8. The DCI is added with a CRC scrambled by a C-RNTI or an MCS-C-RNTI. A base station as claimed in claim 6 or 7.

9. The control unit sets a number of bits of the transform precoder information included in the DCI based on the information indicating that the DCI includes the transform precoder information. A base station as claimed in claim 6 or 7.

10. When the transform precoder is applied to the transmission of the PUSCH, a DFT-s-OFDM waveform is applied to the transmission of the PUSCH; If the transform precoder is not applied to the transmission of the PUSCH, a CP-OFDM waveform is applied to the transmission of the PUSCH. A base station as claimed in claim 6 or 7.

11. Receiving a radio resource control (RRC) message from a base station (200), the message including: information for setting one or more uplink bandwidth portions (UL BWPs) in one serving cell; a first parameter used when a transform precoder is applied to a physical uplink shared channel (PUSCH) transmission; a second parameter used when the transform precoder is not applied to the PUSCH transmission; and information indicating that downlink control information (DCI) used for scheduling the PUSCH includes transform precoder information indicating whether or not the transform precoder is applied; Receive the DCI from the base station on a physical downlink control channel (PDCCH); the first parameter and the second parameter are set for one UL BWP included in the one or more UL BWPs; Determine that the DCI includes the transform precoder information based on information indicating that the DCI includes the transform precoder information; Determine to use the first parameter when applying the transform precoder to the transmission of the PUSCH based on the transform precoder information included in the DCI; When the transform precoder is not applied to the transmission of the PUSCH based on the transform precoder information included in the DCI, the second parameter is determined to be used. A method for a communication device (100).

12. The first parameter and the second parameter include at least one of a parameter related to generation of a sequence of a demodulation reference signal (DMRS) related to the transmission of the PUSCH and a parameter related to determination of an MCS table used for the transmission of the PUSCH. The method of claim 11.

13. The DCI is added with a CRC scrambled by a C-RNTI or an MCS-C-RNTI. A method for a communication device according to claim 11 or 12.

14. Determining a number of bits of the transform precoder information included in the DCI based on the information indicating that the DCI includes the transform precoder information. A method for a communication device according to claim 11 or 12.

15. When the transform precoder is applied to the transmission of the PUSCH, a DFT-s-OFDM waveform is applied to the transmission of the PUSCH; When the transform precoder is not applied to the transmission of the PUSCH, a CP-OFDM waveform is applied to the transmission of the PUSCH. A method for a communication device according to claim 11 or 12.