WO2024034472A1

WO2024034472A1 - Communication device, base station, and communication method

Info

Publication number: WO2024034472A1
Application number: PCT/JP2023/028148
Authority: WO
Inventors: 大輝前本
Original assignee: 株式会社デンソー
Priority date: 2022-08-08
Filing date: 2023-08-01
Publication date: 2024-02-15

Abstract

A communication device (100) is provided with: a reception unit (112) that receives, from a base station (210), a medium access control element (MAC CE) or downlink control information (DCI) including transform precoder information indicating whether or not to adopt a transform precoder; a control unit (120) that, on the basis of the transform precoder information, performs switching between adopting or not adopting the transform precoder for transmission of an uplink signal; and a transmission unit (111) that transmits, to the base station at a timing at which a prescribed time has elapsed from receiving the transform precoder information, the uplink signal which has undergone the switching.

Description

Communication equipment, base station and communication method

Cross-reference to related applications

This application is based on patent application No. 2022-126215 filed on August 8, 2022, and claims the benefit of priority thereto, and all contents of that patent application are referred to is incorporated herein by.

The present disclosure relates to a communication device, a base station, and a communication method used in a mobile communication system.

The 3GPP (registered trademark, same hereinafter) (3rd Generation Partnership Project), which is a standardization project for mobile communication systems, uses orthogonal frequency division multiplexing (OFDM) using a cyclic prefix (CP) as the waveform of an uplink signal. (hereinafter referred to as "CP-OFDM") or discrete Fourier transform spreading (DFT) OFDM (hereinafter referred to as "DFT-s-OFDM") can be applied. DFT-s-OFDM is CP-OFDM to which a function of 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 which waveform is used, DFT-s-OFDM or CP-OFDM.

In 3GPP Releases 15 and 16, the application of a transform precoder is defined by a communication device by a network (e.g., a base station) using radio resource control (RRC) layer signaling (hereinafter referred to as "RRC signaling"). is set to However, when using RRC signaling, the processing delay in the communication device is larger than when using signaling of layers lower than the RRC layer, so it is difficult to apply the transform precoder at an appropriate timing depending on the situation. There is a possibility that it will not be possible to switch between the two.

Therefore, studies are being conducted on technology that enables flexible control of uplink transmission by more dynamically switching the waveform of uplink signals that have been switched using RRC signaling (for example, in the non-patent literature (see 1).

The communication device according to the first aspect receives downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder from a base station. a receiving unit; a control unit that switches whether or not to apply the transform precoder to transmission of an uplink signal based on the transform precoder information; and a predetermined period of time after receiving the transform precoder information. and a transmitter that transmits the uplink signal to which the switching has been applied to the base station at a timing after the elapse of.

The base station according to the second aspect transmits downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder to the communication device. Switching of application of the transform precoder is applied based on the transform precoder information at a timing after a predetermined time has elapsed since the transmitter and the communication device received the transform precoder information. and a receiving unit that receives an uplink signal from the communication device.

The communication method according to the third aspect is a communication method executed by a communication device. The communication method includes the steps of receiving, from a base station, downlink control information (DCI) or medium access control element (MACCE) including transform precoder information indicating whether or not to apply a transform precoder; a step of switching whether or not to apply the transform precoder to transmission of an uplink signal based on form precoder information; and a step of switching the transform precoder at a timing after a predetermined time has elapsed since the transform precoder information was applied. transmitting an uplink signal to the base station.

Objects, features, advantages, etc. of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings.
FIG. 1 is a diagram showing the configuration of a mobile communication system according to an embodiment. FIG. 2 is a diagram illustrating a configuration example of a protocol stack according to the embodiment. FIG. 3 is a diagram for explaining application of the transform precoder. FIG. 4 is a diagram showing the configuration of the UE according to the embodiment. FIG. 5 is a diagram showing the configuration of a base station according to the embodiment. FIG. 6 is a sequence diagram for explaining the first operation example according to the embodiment. FIG. 7 is a sequence diagram for explaining a second operation example according to the embodiment. FIG. 8 is a sequence diagram for explaining a third operation example according to the embodiment. FIG. 9 is a sequence diagram for explaining a fourth operation example according to the embodiment.

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 designated by the same or similar symbols.

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. For this reason, there is a concern that it may not be possible to dynamically switch and transmit the waveform of an uplink signal using signaling in a layer lower than the RRC layer.

Therefore, the present disclosure provides a communication device, a base station, and a communication method that can dynamically switch the waveform of an uplink signal and appropriately transmit it using signaling of a layer lower than the RRC layer. is one of the objectives.

(System configuration)
First, with reference to FIG. 1, the configuration of a mobile communication system 1 according to the present embodiment will be described. 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, that is, a mobile communication system based on NR (New Radio).

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 an NG-RAN (Next Generation Radio Access Network) 20, which is a 5G radio access network, and a 5GC (5G Core Network) 30, which is a 5G core network.

The UE 100 is a communication device that communicates via the base station 200. UE 100 may be a device used by a user. The UE 100 is, for example, a mobile device such as a mobile phone terminal such as a smartphone, a tablet terminal, a notebook PC, a communication module, or a communication card. UE 100 may be a vehicle (for example, a car, a train, etc.) or a device installed therein. The UE 100 may be a transport aircraft other than a vehicle (for example, a ship, an airplane, etc.) or a device installed therein. UE 100 may be a sensor or a device provided therein. Note that the UE 100 includes 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, It may also be referred to by other names, such as a remote station, remote terminal, remote device, or remote unit. Furthermore, the UE 100 is an example of a terminal, and the terminal may include factory equipment and the like.

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 communication area. One cell belongs to one frequency (carrier frequency). The term "cell" may represent a wireless communication resource, and may also represent a 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. Furthermore, the base station 200 is connected to other base stations 200 (which may be referred to as adjacent base stations) via the Xn interface. Base station 200 communicates with neighboring base stations via the Xn interface. The base station 200 also provides NR user plane and control plane protocol termination for the UE 100, and is connected to the 5GC 30 via the NG interface. Such an NR base station 200 is sometimes referred to as a gNodeB (gNB).

5GC30 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). AMF performs mobility management of UE 100. UPF provides functions specialized for U-plane processing. AMF and UPF are connected to base station 200 via the NG interface.

(Example of protocol stack configuration)
Next, a configuration example of the protocol stack according to this embodiment will be described with reference to FIG. 2.

The protocols in the wireless section between the UE 100 and the base station 200 include a physical (PHY) layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, and a PDCP (Packet Data Convert) layer. ence Protocol) layer, It has an RRC layer.

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 UE 100 and the PHY layer of base station 200 via a physical channel.

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 uplink and downlink transport formats (transport block size, modulation and coding scheme (MCS)) and resources to be allocated to the UE 100.

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

The PDCP layer performs header compression/expansion, and encryption/decryption.

An SDAP (Service Data Adaptation Protocol) layer may be provided as an upper layer of the PDCP layer. The SDAP (Service Data Adaptation Protocol) layer is a link between IP flow, which is the unit in which the core network performs QoS (Quality of Service) control, and radio bearer, which is the unit in which the AS (Access Stratum) performs QoS control. Perform mapping.

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 UE 100 and the RRC layer of base station 200. When there is an RRC connection between the RRC of the UE 100 and the RRC of the base station 200, the UE 100 is in an RRC connected state. If 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.

The NAS layer located above the RRC layer in the UE 100 performs session management and mobility management of 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.

Note that the UE 100 has an application layer, etc. in addition to the wireless interface protocol.

(Radio frame configuration)
In 5G systems, downlink and uplink transmissions are configured within radio frames of 10 ms duration. For example, a radio frame is composed of 10 subframes. For example, one subframe may be 1 ms. Furthermore, one subframe may be composed of one or more slots. For example, the number of symbols constituting one slot is 14 in a normal CP (Cyclic Prefix) and 12 in an extended CP. Further, the number of slots constituting one subframe changes depending on the set subcarrier interval. For example, for normal CP, if the subcarrier spacing is set to 15kHz, the number of slots per subframe is 1 (i.e., 14 symbols), and if the subcarrier spacing is set to 30kHz, the number of slots per subframe is If the number of slots per subframe is 2 (i.e., 28 symbols) and 60kHz is set as the subcarrier spacing, the number of slots per subframe is 4 (i.e., 56 symbols) and the subcarrier spacing is 120kHz. is set, the number of slots per subframe is 8 (ie, 128 symbols). Further, when 60 kHz is set as the subcarrier interval for the extended CP, the number of slots per subframe is 4 (that is, 48 symbols). That is, the number of slots constituting one subframe is determined based on the subcarrier interval set by base station 200. Furthermore, the number of symbols constituting one subframe is determined based on the subcarrier interval set by base station 200. That is, the number of symbols constituting a 1 ms subframe is determined based on the subcarrier interval set by base station 200, and the length of each symbol (length in the time direction) changes.

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

For example, either CP-OFDM or DFT-s-OFDM is used for uplink signals such as physical uplink shared channel (PUSCH) and/or phase-tracking reference signals (PTRS). It's okay to be hit. On the other hand, CP-OFDM may be used for downlink signals such as a physical downlink shared channel (PDSCH). Further, for example, CP-OFDM may be used for a signal used for direct communication between the UEs 100, such as a sidelink signal (eg, physical sidelink shared channel (PSSCH)).

Since CP-OFDM is a multicarrier waveform, it has the advantage of being resistant to multipath interference, but has the disadvantage that the peak to average power ratio (PAPR) increases. Furthermore, since CP-OFDM is a multicarrier waveform, a transmission data sequence and a reference signal (RS) can be frequency division multiplexed onto different subcarriers of the same symbol. Furthermore, the transmission band of the CP-OFDM transmission signal is not limited to a continuous frequency band (for example, one or more consecutive physical resource blocks (PRBs)), but also a discontinuous frequency band (for example, a plurality of discontinuous PRBs). ), there are fewer restrictions on scheduling than DFT-s-OFDM. Therefore, for example, in a cell where the load is higher than a predetermined level, frequency use efficiency can be improved by using CP-OFDM.

Since DFT-s-OFDM has a single carrier waveform, it can reduce PAPR more than CP-OFDM. Therefore, power close to maximum rated power can be used, and a higher order modulation method and/or higher coding rate can be used. As a result, the power consumption of the UE 100 and/or the cost of the UE 100 can be reduced. Additionally, it becomes easier to secure 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 on different subcarriers of the same symbol, which is different from CP-OFDM. Further, the transmission band of the DFT-s-OFDM transmission signal is limited to a continuous frequency band (for example, one or more continuous PRBs).

As shown in FIG. 3A, DFT-s-OFDM differs from CP-OFDM shown in FIG. 5B shown in FIG. 3B 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.

In DFT-s-OFDM, the encoded 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, input to an N-point Inverse Fast Fourier Transform (IFFT), and transformed from the frequency domain to the time domain. Note that DFT may be replaced with Fast Fourier Transform (FFT), and IFFT may be replaced with Inverse Discrete Fourier Transform (IDFT). If N>M, the input information to the IFFT that is not used is set to zero. N may be equal to the number of subcarriers corresponding to a given frequency bandwidth (eg, 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 whose instantaneous power fluctuation is small and whose bandwidth depends on M. The output from the IFFT is subjected to parallel-to-serial (P/S) conversion, and a CP is added. CP is also called guard interval (GI). In this way, in DFT-s-OFDM, a signal having single carrier characteristics is generated and transmitted in one symbol. Note that the CP may be inserted before P/S conversion for the output from the IFFT.

In CP-OFDM, the encoded 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. Input information to the IFFT that is not used is set to zero. The output from the IFFT is P/S converted and a CP is inserted. In this way, in CP-OFDM, since multicarriers are used, RS and transmission data sequences can be frequency division multiplexed. Note that it goes without saying that the transmission data sequence may be transmitted without frequency division multiplexing with the RS.

As mentioned above, the characteristics of DFT-s-OFDM and CP-OFDM are in a trade-off relationship, so DFT-s-OFDM and CP-OFDM are It is desirable to switch between s-OFDM and CP-OFDM. Note that DFT-s-OFDM and CP-OFDM are switched depending on whether or not a transform precoder is applied.

In 3GPP Releases 15 and 16, whether to apply a transform precoder is determined by the network 10 (e.g., base station 200) using radio resource control (RRC) layer signaling (hereinafter referred to as "RRC signaling"). It is set in the UE 100. However, when using RRC signaling, the processing delay in the communication device is larger than when using signaling of a layer lower than the RRC layer, so it is difficult to apply the transform precoder at an appropriate timing depending on the situation. There is a possibility that it will not be possible to switch between the two. Therefore, studies are being conducted on technology that enables flexible control of uplink transmission by more dynamically switching the waveform of uplink signals that have been switched using RRC signaling.

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. For this reason, there is a concern that it may not be possible to dynamically switch and transmit the waveform of an uplink signal using signaling in a layer lower than the RRC layer. In an embodiment described later, an operation for dynamically switching the waveform of an uplink signal using signaling of a layer lower than the RRC layer to enable appropriate transmission will be described.

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

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

(Setting information regarding transform precoder)
The setting information regarding the transform precoder may be, for example, at least one of the following information. The configuration information may be transmitted from the base station 200 to the UE 100 using a radio resource control (RRC) message. That is, base station 200 may transmit an RRC message including configuration information regarding the transform precoder to UE 100. Furthermore, the UE 100 may determine whether to apply a transform precoder to the uplink signal based on the configuration information included in the RRC message.

First, the configuration information regarding the transform precoder includes configuration information (e.g., PUSCH- config). PUSCH-config is included in the information (eg, BWP-UplinkDedicated) used to configure UE-specific parameters of one uplink BWP. PUSCH transmissions are in a Downlink Control Information (DCI) format appended with a Cyclic Redundancy Check (CRC) (CRC parity bits) scrambled by a Cell Radio Network Temporary Identifier (C-RNTI) (i.e. used for PUSCH scheduling). DCI format).

Enabling or disabling transform precoding for PUSCH transmission is configured in the UE 100 using transform precoder information (specifically, transformPrecoder), which is a parameter included in PUSCH-config. Ru. 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.

Second, the configuration information regarding the transform precoder may be configuration information (for example, ConfiguredGrantConfig) for configuring uplink transmission without a dynamic grant. ConfiguredGrantConfig may be used to configure dynamic unlicensed uplink transmission according to two possible schemes. The actual uplink grant may be configured via RRC and the physical downlink control channel (Configured Scheduling - addressed to the Radio Network Temporary Identifier (CS-RNTI)). PDCCH).

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

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

ConfiguredGrantConfig is included in BWP-UplinkDedicated, which is used to configure UE-specific parameters of one uplink BWP. ConfiguredGrantConfig includes transform precoder information (specifically, transformPrecoder). Using the transform precoder information (transformPrecoder), which is a parameter included in ConfiguredGrantConfig, the UE 100 can enable or disable transform precoding for CG type 1 PUSCH transmission/CG type 2 PUSCH transmission. Set. 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, UE 100 enables or disables transform precoding according to the “msg3-transformPrecoder” field in RACH-ConfigCommon, which will be described later.

Third, the configuration information regarding the transform precoder may be configuration information (eg, 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 regarding random access procedures. RACH-ConfigCommon is included in information (eg, BWP-UplinkCommon) used to configure cell-specific parameters (ie, common parameters) of one uplink BWP. RACH-ConfigCommon includes transform precoder information (msg3-transformPrecoder). msg3-transformPrecoder is Msg. 3 Enable the transmit transform precoder. If the msg3-transformPrecoder field does not exist, the UE 100 disables the transform precoder. Therefore, using the transform precoder information (msg3-transformPrecoder), which is a parameter included in RACH-ConfigCommon, Msg. 3 (UL-SCH of Msg. 3) is set in the UE 100 to enable (or disable) transform precoding for PUSCH transmission.

In addition, Msg. 3. PUSCH transmission is in DCI format (i.e., DCI format used for PUSCH scheduling) with a CRC added with scrambled by random access (RA) response grant (RA) or temporary C-RNTI (TC-RNTI). format). RA response permission is given by Msg. 2 (ie, random access response). The RA response grant is sent as a MAC payload for the RA response.

Fourth, the configuration information regarding the transform precoder is configuration information for specifying the physical uplink shared channel (PUSCH) allocation for message A in the two-step RA type procedure (e.g., MsgA-PUSCH-Config). It may be. MsgA-PUSCH-Config is used to specify the PUSCH assignment for message A in a two-step RA type procedure. MsgA-PUSCH-Config may be configuration information regarding random access procedures. MsgA-PUSCH-Config includes transform precoder information (msgA-TransformPrecoder). msgA-TransformPrecoder enables or disables the transform precoder for MsgA transmission. Msg. Validity or invalidity of transform precoding for PUSCH transmission for Msg.A (specifically, UL-SCH of Msg.A) is set in the UE 100.

In addition, Msg. A PUSCH transmission is performed using the PUSCH resource configured with the parameters (for example, MsgA-PUSCH-Resource) included in MsgA-PUSCH-Config. MsgA-PUSCH-Resource is included in BWP-UplinkCommon used to configure cell-specific parameters (common parameters) of one uplink BWP.

(UE procedures for applying transform precoding on PUSCH)
A UE procedure for applying transform precoding on PUSCH will be described.

The UE 100 performs PUSCH transmission scheduled by an uplink grant (UL grant) (i.e., RA response grant) in a random access (RA) response, or DCI format 0 CRC scrambled by TC-RNTI (Temporary C-RNTI). -0, even if transform precoding is enabled or disabled according to the transform precoder information (specifically, parameter: msg3-transformPrecoder) for scheduled PUSCH transmission. good.

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

The UE 100 performs the following (i) and (ii) for PDCCH CRC scrambled by CS-RNTI, C-RNTI, or MCS-C-RNTI with NDI=1, or PUSCH transmission scheduled by Transform precoding may be enabled or disabled depending on the case.

(i) If DCI format 0_0 is received (i.e., PUSCH transmission is scheduled by DCI format 0_0), the UE 100 enables/disables transform precoding according to the parameter: msg3-transformPrecoder. disabled) may be applied.

(ii) If DCI format 0_0 is not received (i.e. PUSCH transmission was scheduled by DCI format 0_1/0_2), (a) If the parameter included in PUSCH-Config: transformPrecoder is set; The UE 100 may apply enable/disable of transform precoding according to transformPrecoder, which is a parameter included in push-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 performs transform precoding according to the parameter: msg3-transformPrecoder. Enabled/disabled may also be applied.

The UE 100 may apply enabled/disabled transform precoding to PUSCH transmission based on the configured grant in the following cases (i) and (ii). (i) If the parameter: transformPrecoder included in ConfiguredGrantConfig is set, the UE 100 can enable/disable transform precoding according to the parameter: transformPrecoder included in ConfiguredGrantConfig. by applying (disabled) Good too. (ii) If the parameter: transformPrecoder included in ConfiguredGrantConfig is not set, the UE 100 may apply enable/disable of transform precoding according to the parameter: msg3-transformPrecoder. .

As described above, whether or not to apply the transform precoder is switched by RRC signaling. Note that whether or not to apply the transform precoder may be rephrased as whether or not to enable the transform precoder, or whether or not to activate the transform precoder.

(UE configuration)
The configuration of the UE 100 according to the embodiment will be described with reference to FIG. 4. UE 100 includes a communication section 110 and a control section 120.

The communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving wireless signals to and from the base station 200. The communication unit 110 includes at least one transmitting unit 111 and at least one receiving unit 112. The transmitting section 111 and the receiving section 112 may be configured to include a plurality of antennas and RF circuits. An antenna converts a signal into radio waves and radiates the radio waves into space. Further, the antenna receives radio waves in space and converts the radio waves into signals. The RF circuit performs analog processing of signals transmitted and received via the antenna. The RF circuit may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

The control unit 120 performs various controls in the UE 100. Control unit 120 controls communication with base station 200 via communication unit 110. The operations of the UE 100 described above and below may be operations under the control of the control unit 120. The control unit 120 may include at least one processor that can execute 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 digitally processes signals transmitted and received via the antenna and the RF circuit. The digital processing includes processing of the RAN protocol stack. Note that the memory stores a program executed by the processor, parameters related to the program, and data related to the program. Memory is ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Program The memory may include at least one of a random access memory (RAM), and a flash memory. All or part of the memory may be contained within the processor.

In the UE 100 configured in this way, the receiving unit 112 transmits downlink control information (DCI) or medium access control element (MACCE) including transform precoder information indicating whether or not to apply a transform precoder to the base station. It is received from station 200. Control unit 120 of UE 100 determines a target frequency resource for transform precoder information. Based on the transform precoder information, the control unit 120 determines whether to apply a transform precoder to the transmission of uplink signals in the target frequency resource. Thereby, the UE 100 can dynamically switch and transmit the waveform of the uplink signal in the target frequency resource targeted by the transform precoder information.

Additionally, the receiving unit 112 receives downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder from the base station 200. Regarding the parameters set for the target of transform precoder information, the control unit 120 controls a first parameter to be used when a transform precoder is applied, and a first parameter to be used when a transform precoder is not applied. Decide which of the two parameters to use. As a result, the UE 100 determines 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 the transform precoder Parameters related to the application of can be switched, and dynamic parameter switching is possible.

Further, the receiving unit 112 may receive downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder from the base station 200. . The control unit 120 switches whether or not to apply a transform precoder to the transmission of uplink signals based on the transform precoder information. The transmitter 111 transmits the uplink signal to which the switching has been applied to the base station 200 at a timing after a predetermined time has elapsed since receiving the transform precoder information. For example, due to the communication capability of the UE 100, it may not be possible to transmit an uplink signal to the base station 200 immediately after receiving the transform precoder information. The UE 100 can perform switching at an appropriate timing by transmitting an uplink signal to which switching has been applied to the base station 200 after a predetermined period of time has elapsed.

(Base station configuration)
The configuration of base station 200 according to the embodiment will be described with reference to FIG. 5. Base station 200 includes a communication section 210, a network communication section 220, and a control section 230.

For example, the communication unit 210 receives a wireless signal from the UE 100 and transmits the wireless signal to the UE 100. The communication unit 210 includes at least one transmitting unit 211 and at least one receiving unit 212. The transmitter 211 and the receiver 212 may be configured to include an RF circuit. The RF circuit performs analog processing of signals transmitted and received via the antenna. The RF circuit may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

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 signals to the adjacent base stations. Further, the network communication unit 220 receives a signal from the core network device 300 connected via the NG interface, and transmits the signal to the core network device 300, for example.

The control unit 230 performs various controls in the base station 200. The control unit 230 controls communication with the UE 100 via the communication unit 210, for example. Further, the control unit 230 controls communication with nodes (eg, adjacent base stations, core network devices 300) via the network communication unit 220, for example. The operations of the base station 200 described above and below may be operations under the control of the control unit 230. The control unit 230 may include at least one processor that can execute 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 digitally processes signals transmitted and received via the antenna and the RF circuit. The digital processing includes processing of the RAN protocol stack. Note that the memory stores a program executed by the processor, parameters related to the program, and data related to the program. All or part of the memory may be contained within the processor.

In the base station 200 configured in this way, the control unit 230 determines the target frequency resource to be the target of transform precoder information indicating whether or not to apply a transform precoder. The transmitter 211 transmits downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information to the UE 100. Thereby, the UE 100 can dynamically switch the waveform of an uplink signal and transmit it in the target frequency resource targeted by the transform precoder information. The base station 200 can receive uplink signals whose waveforms have been dynamically switched.

Furthermore, the transmitting unit 211 transmits downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder to the UE 100. The receiving unit 112 receives the uplink signal to which the application of the transform precoder has been switched based on the transform precoder information at a timing after a predetermined period of time has passed since the UE 100 receives the transform precoder information. Receive from UE 100. For example, due to the communication capability of the UE 100, it may not be possible to transmit an uplink signal to the base station 200 immediately after receiving the transform precoder information. The UE 100 can switch at an appropriate timing by transmitting the uplink signal to which the switching has been applied to the base station 200 after a predetermined period of time has elapsed.

(First operation example)
A first operation example of the mobile communication system 1 will be described with reference to FIG. 6.

Step S101:
The transmitter 111 of the UE 100 may transmit to the base station 200 capability information indicating the capability of the UE 100, which is used to determine a predetermined time period to be described later. The receiving unit 212 of the base station 200 may receive capability information from the UE 100.

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

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

Step S102:
The transmitter 211 of the base station 200 may transmit to the UE 100 an RRC message including timing information for determining timing (appropriately referred to as predetermined timing), which will be described later. The receiving unit 112 of the UE 100 may receive timing information from the base station 200.

As will be described later, the timing information is information for determining the timing after a predetermined time has elapsed after receiving the TP information included in the DCI or MAC CE (that is, the predetermined timing). The timing information may include, for example, information for determining time resources for PUSCH transmission based on TP information. The information may indicate the slot, symbol, and/or starting position in which PUSCH transmission is performed. For example, the timing information sets the relationship between the slot, symbol, and/or starting position at which DCI or MAC CE including TP information is received and the slot, symbol, and/or starting position at which PUSCH transmission is performed. It may also be used to (prescribe). When the UE 100 receives DCI or MAC CE including TP information in a certain slot, a certain symbol, and/or a certain starting position, the UE 100 determines the timing of the certain slot, the certain symbol, and/or the certain starting position, and the timing. PUSCH transmission may be performed based on the information.

The timing information may include information indicating the 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 a timing offset from a reference value for normal PUSCH transmission. The timing information may include information indicating the validity period of the transform precoder information.

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 regarding PUSCH configuration. The configuration information may include timing information that is applied individually to the configuration information. The timing information may include information common to multiple types of setting information regarding PUSCH. The multiple types of configuration information may include, for example, at least one of PUSCH-config, ConfiguredGrantConfig, RACH-ConfigCommon, and MsgA-PUSCH-Config.

Furthermore, the transmitter 211 of the base station 200 may transmit an RRC message including target designation information that designates a target frequency resource, which will be described later, to the UE 100. The receiving unit 112 of the UE 100 may receive target designation information from the base station 200. Frequency resources are also referred to as resources in the frequency domain.

The target specification information may include information specifying the serving cell. The targeting information may include information specifying a cell group. The target specification information may include information specifying uplink BWP. That is, 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. In this embodiment, specifying may be used in the same meaning as setting.

Additionally, the transmitter 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 transmitter 211 of the base station 200 may transmit the first parameter and the second parameter to the UE 100 in separate RRC messages.

The first parameter and/or the second parameter may be a parameter set for the target of 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) include a parameter related to a sequence of DMRS (Demodulation Reference Signal) related to PUSCH, a parameter related to a sequence of PTRS related to PUSCH, a parameter related to a sequence of PTRS related to PUSCH, and a parameter related to a sequence of PTRS related to PUSCH. It may be at least one of the parameters related to the determination of the Modulation and Channel Coding Scheme) table.

In the following, for ease of explanation, parameters related to the sequence of DMRS related to PUSCH used when a transform precoder is applied (i.e., when the transform precoder is enabled), A parameter related to the sequence of related PTRS and/or a parameter related to determination of the MCS table will be described as a first parameter. However, parameters related to the sequence of DMRS related to the PUSCH, parameters related to the sequence of PTRS related to the PUSCH, and/or parameters related to the determination of the MCS table are used when a transform precoder is applied. Of course, each of the parameters may be different. For example, a parameter related to a DMRS sequence related to PUSCH used when a transform precoder is applied may be the first parameter. Further, the parameter related to the PTRS sequence related to PUSCH used when the transform precoder is applied may be a third parameter. Further, the parameter related to determining the MCS table used when the transform precoder is applied may be a fourth parameter.

Similarly, parameters related to the sequence of DMRS associated with the PUSCH used when the transform precoder is not applied (i.e., when the transform precoder is disabled), parameters associated with the sequence of PTRS associated with the PUSCH A parameter and/or a parameter related to determining the MCS table will be referred to as a second parameter. However, parameters related to the sequence of DMRS related to PUSCH, parameters related to the sequence of PTRS related to PUSCH, and/or parameters related to the determination of the MCS table, which are used when a transform precoder is not applied. Of course, each parameter may be different. For example, a parameter related to a DMRS sequence related to PUSCH used when a transform precoder is not applied may be a second parameter. Further, the parameter related to the PTRS sequence related to PUSCH used when the transform precoder is not applied may be the fifth parameter. Further, the parameter related to determining the MCS table used when the transform precoder is not applied may be the sixth parameter.

Step S103:
The transmitter 211 of the base station 200 transmits DCI or MAC CE including TP information to the UE 100. Receiving section 112 of UE 100 receives DCI or MAC CE including TP information from base station 200. TP information indicates whether to apply a transform precoder. For example, the TP information may be information indicating whether to apply a transform precoder to the corresponding PUSCH transmission. That is, the TP information may be information indicating whether the transform precoder is valid or invalid. Further, the TP information may include target specification information.

The transmitter 211 may transmit DCI including TP information. Therefore, the transmitter 211 may transmit the TP information using the physical layer (ie, L1 signaling). For example, the transmitter 211 may transmit DCI including TP information on the PDCCH. Further, the transmitter 211 may transmit the MAC CE including TP information on the PDSCH.

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

Additionally, the DCI including TP information may be included in the PDCCH order. The PDCCH order may be used to initiate a random access (RA) procedure. The random access procedure initiated (or directed) by the PDCCH order is also referred to as the Contention Free Random Access (CFRA) procedure. For example, a PDCCH order may initiate a 4-step CFRA procedure or a 2-step CFRA procedure. Also, if the CRC of DCI format 1_0 is scrambled by C-RNTI and the frequency domain resource allocation field (i.e., frequency domain resource allocation field) is all "1", DCI format 1_0 is started by the PDCCH order. It may be for RA procedures.

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

For example, when DCI format 1_0 is used as a DCI format for PDCCH order, information indicating a random access preamble may be included in the DCI format 1_0. In the RA procedure initiated by the PDCCH order, the UE 100 may transmit the random access preamble. Also, if the DCI format 1_0 is used as a DCI format for PDCCH order, the index of SS / PBCH (Syncronizations Signal And / OR PHYSICAL BROADCAST CHANNEL) in the DCI format 1_0. The information shown may be included. Here, when DCI format 1_0 is used as a DCI format for PDCCH order, TP information (DCI including TP information may be included) may be included in the DCI format 1_0. For example, reserved bits of DCI format 1_0 for PDCCH order may be used as TP information.

Note that the transmitting unit 211 of the base station 200 may transmit an RRC message including information regarding a field of TP information (DCI including TP information) to the UE 100. The information may be information indicating the presence or absence of a 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 DCI includes TP information (that is, the presence or absence of the TP information in the DCI) based on the information.

Furthermore, the transmitter 211 of the base station 200 may transmit to the UE 100 an RRC message that includes configuration information for monitoring the PDCCH for the DCI (or DCI format) that includes TP information. The configuration information includes information for configuring a control resource set (for example, CORESET(s)) for monitoring PDCCH for DCI (or DCI format) including TP information, and/or information for configuring a control resource set (for example, CORESET(s)) for DCI (or DCI format) including TP information. The search space set may include information for setting a search space set (Search Space Set(s)) for monitoring the PDCCH for (format). 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).

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

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

The DCI or MAC CE may include target specification information. The MAC CE may include TP information and target specification 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.

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

Step S104:
The control unit 120 of the UE 100 determines the target of TP information. The control unit 120 determines a target frequency resource that is a target of TP information. The target frequency resource may be at least one of a cell group, a serving cell, and a bandwidth portion (for example, an uplink bandwidth portion (UL BWP)). That is, the control unit 120 of the UE 100 may determine the cell group, serving cell, and/or bandwidth portion (for example, uplink bandwidth portion (UL BWP)) to which the TP information is applied. In addition, the control unit 120 of the UE 100 transmits the TP information for uplink signal transmission in the cell group, the serving cell, and/or the bandwidth portion (for example, the uplink bandwidth portion (UL BWP)). may be applied.

Additionally, 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 serving cells configured for the UE 100 and/or all uplink BWPs configured for the UE 100 as target frequency resources. Here, one or more uplink BWPs may be configured in one serving cell. For example, a base station may transmit an RRC message that includes information for configuring one or more uplink BWPs in each of one or more serving cells.

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

Further, when the DCI is a DCI format that includes TP information, the control unit 120 may determine at least one of a serving cell scheduled using the DCI format and/or an uplink BWP as the target frequency resource. . That is, when the control unit 120 receives a DCI format including TP information, the control unit 120 determines a serving cell scheduled using the DCI format including the TP information and/or an uplink BWP as the target frequency resource. good. For example, when the control unit 120 receives a DCI format including TP information, the control unit 120 targets a serving cell and/or an uplink BWP to which PUSCH resources scheduled using the DCI format including the TP information are allocated. It may also be determined as a frequency resource. The control unit 120 may apply the TP information to the transmission of uplink signals in the target frequency resource.

In addition, when the DCI is a DCI format that includes TP information, the control unit 120 controls the uplink component carrier corresponding to the downlink component carrier on which the DCI format is received, and/or the downlink component carrier on which the DCI format is received. An uplink BWP corresponding to the BWP may be determined as the target frequency resource. For example, the control unit 120 may determine as the target frequency resource an uplink BWP (for example, an uplink BWP with the same index as the downlink BWP) corresponding to the downlink BWP in which DCI including TP information has been detected. good. That is, when the control unit 120 receives a DCI format including TP information, the control unit 120 may determine the serving cell (uplink serving cell) in which the DCI format including the TP information is detected as the target frequency resource. As described above, the DCI format including TP information includes the DCI format for PDCCH orders.

Additionally, the control unit 120 may determine the activated uplink BWP as the target frequency resource.

Step S105:
Control unit 120 of UE 100 determines whether to apply a transform precoder to uplink signal transmission (for example, PUSCH transmission) in the target frequency resource. Control unit 120 determines whether to apply a transform precoder based on the TP information.

If the TP information indicates that a transform precoder is to be applied, the control unit 120 may determine to apply a transform precoder to the transmission of uplink signals in the target frequency resource. On the other hand, if the TP information indicates that the transform precoder is not applied, the control unit 120 may determine that the transform precoder is not applied to the transmission of the uplink signal in the target frequency resource.

When the control unit 120 receives the RRC message including the second TP information from the base station 200, the control unit 120 selects the TP information used for determining whether to apply the transform precoder, out of the first TP information and the second TP information. may be selected. That is, when the control unit 120 receives the first TP information and the second TP information, the control unit 120 determines whether or not to apply the transform precoder based on either the first TP information or the second TP information. good. For example, when the control unit 120 receives the first TP information, even if the second TP information is set (regardless of whether the second TP information is set), the control unit 120 performs a transceiver based on the first TP information. It may also be determined whether or not to apply a form precoder. Furthermore, when the second TP information is set, even if the first TP information is received (regardless of whether or not the first TP information is received), the control unit 120 performs the transform based on the second TP information. It may also be determined whether or not to apply a precoder.

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

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

That is, the control unit 120 sets whether or not to apply the transform precoder based on the second TP information included in PUSCH-config and/or ConfiguredGrantConfig, and applies the transform precoder based on the first TP information. When it is instructed whether or not to apply the transform precoder, it may be determined whether or not to apply the transform precoder according to the first TP information. For example, an instruction for applying a transform precoder based on the first TP information may overwrite a setting for applying a transform precoder based on the second TP information. Further, the control unit 120 sets whether or not to apply the transform precoder based on the second TP information included in RACH-ConfigCommon and/or MsgA-PUSCH-Config, and also sets whether or not to apply the transform precoder based on the first TP information. When it is instructed whether or not to apply the transform precoder, it may be determined whether or not to apply the transform precoder according to the second TP information. For example, an instruction for applying a transform precoder based on the first TP information does not have to overwrite a setting for applying a transform precoder based on the second TP information (for applying a transform precoder based on the second TP information). settings may be retained). 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. That is, the control unit 120 is configured to determine whether or not to apply the transform precoder based on the second TP information included in PUSCH-config, ConfiguredGrantConfig, RACH-ConfigCommon, and/or MsgA-PUSCH-Config, and , when it is instructed whether to apply the transform precoder based on the first TP information, it may be determined whether to apply the transform precoder always according to the first TP information.

The control unit 120 switches whether or not to apply the transform precoder based on the TP information. When the control unit 120 determines to apply the transform precoder based on the TP information when the transform precoder is not applied to the transmission of the uplink signal in the target frequency resource, the control unit 120 applies the DFT-s-OFDM. Performs control to switch to using waveforms. On the other hand, if the transform precoder is applied to the transmission of uplink signals in the target frequency resource and the control unit 120 determines not to apply the transform precoder based on the TP information, the control unit 120 determines that the transform precoder is not applied to the transmission of uplink signals in the target frequency resource. Control is performed to switch to use the OFDM waveform.

The control unit 120 may determine parameters used for transmitting uplink signals based on the TP information. Specifically, the control unit 120 controls the parameters set for the target of transform precoder information when the transform precoder is applied (that is, when the transform precoder is enabled). It is determined which of the first parameter to be used and the second parameter to be used when the transform precoder is not applied (that is, when the transform precoder is disabled) is used. The control unit 120 controls, for example, parameters related to a DMRS sequence related to PUSCH (which may be PUSCH transmission), parameters related to a PTRS sequence related to PUSCH (which may be PUSCH transmission), and/or MCS (Modulation and The determined parameters are used as parameters related to determining the channel Coding Scheme) table. Here, the parameters related to determining the MCS table may include parameters related to determining the MCS table related to PUSCH transmission.

The control unit 120 sets the first parameter and the second parameter based on whether or not the transform precoder is applied (that is, based on whether the transform precoder is enabled or disabled). Either one of these may be used. For example, the control unit 120 may use the first parameter when a transform precoder is applied (that is, when the transform precoder is enabled). Further, the control unit 120 may use the second parameter when the transform precoder is not applied (that is, when the transform precoder is disabled). That is, the control unit 120 may determine which of the first parameter and the second parameter to use based on the TP information, and generate a DMRS sequence related to the PUSCH using the determined parameter. Further, the control unit 120 may determine which of the first parameter and the second parameter to use based on the TP information, and generate a PTRS sequence related to the PUSCH using the determined parameter. Further, the control unit 120 may determine which of the first parameter and the second parameter to use based on the TP information, and determine the 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 controls the target resource to which the TP information is applied (i.e., the target resource to which the TP information is applied) Alternatively, the first parameter and/or the second parameter set for the uplink BWP to which the TP information is applied among the plurality of uplink BWPs may be used.

Here, the control unit 120 may suspend (or suspend or temporarily stop) the parameter that is not used among the first parameter and the second parameter. That is, the control unit 120 sets the first parameter and the second parameter based on whether or not the transform precoder is applied (i.e., based on whether the transform precoder is enabled or disabled). Either one of the parameters may be used and the other may be suspended. For example, when a transform precoder is applied, the control unit 120 may use the first parameter and suspend the second parameter. Further, the control unit 120 may use the second parameter and suspend the first parameter when the transform precoder is not applied. Here, the control unit 120 may suspend parameters other than the parameters (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 controls the target resource to which the TP information is applied (i.e., the target resource to which the TP information is applied) Or, using the first parameter and/or second parameter set for the upstream BWP to which the TP information is applied among the plurality of upstream BWPs, other parameters (the first parameter and/or, (second parameter) may be suspended. Therefore, the control unit 120 activates, for example, a parameter corresponding to the instruction of the TP information (that is, related to the target frequency resource determined as the target of the TP information) among the parameters set using the RRC message. Parameters that do not correspond to TP information (that is, not covered by TP information) may be suspended.

For example, if the control unit 120 has an active transform precoder setting and has not received an indication that the transform precoder setting is invalid, the control unit 120 determines that the transform precoder setting is active in the active BWP. Otherwise, the transform precoder configuration may be considered suspended. The transform precoder setting may correspond to whether to apply a transform precoder (ie, enabling or disabling the transform precoder). Further, the transform precoder settings may include either the first parameter or the second parameter.

For example, as described above, when the enablement of the transform precoder is instructed (or set), the control unit 120 controls the uplink BWP to which the transform precoder is applied (that is, the uplink signal is executed). The first parameter set for the active BWP may be used (the first parameter may be considered to be active). Further, when the activation of the transform precoder is instructed (or set), the control unit 120 controls the uplink BWP to which the transform precoder is applied (that is, the active BWP where the uplink signal is executed). ) may not be used (the second parameter may be considered to be suspend).

In addition, when the invalidation of the transform precoder is instructed (or set), the control unit 120 controls the uplink BWP to which the transform precoder is not applied (that is, the active BWP where the uplink signal is executed). It is not necessary to use the first parameter set for (it may be assumed that the first parameter is suspend). In addition, when the invalidation of the transform precoder is instructed (or set), the control unit 120 controls the uplink BWP to which the transform precoder is not applied (that is, the active BWP where the uplink signal is executed). A second parameter may be used (the second parameter may be considered active).

Step S106:
The transmitter 111 of the UE 100 may transmit an uplink signal (for example, PUSCH) to the base station 200. The receiving unit 212 of the base station 200 may receive an uplink signal from the UE 100. For example, when the control unit 120 determines to apply the transform precoder (that is, when the enablement of the transform precoder is instructed (or set)), the transmitting unit 111 applies the transform precoder in the target frequency resource. Transmits an uplink signal to which a precoder is applied. Further, when the control unit 120 generates a DMRS sequence related to the PUSCH using the first parameter, the transmitting unit 111 may transmit the DMRS related to the PUSCH. Here, the transmitter 111 may transmit the DMRS related to the PUSCH in the target frequency resource to which the TP information is applied. Further, when the control unit 120 generates a sequence of PTRS related to the PUSCH using the first parameter, the transmitting unit 111 may transmit the PTRS related to the PUSCH. Here, the transmitter 111 may transmit the PTRS related to the PUSCH in the target frequency resource to which the TP information is applied. Further, when the control unit 120 determines the MCS table using the first parameter, the transmitting unit 111 may perform transmission on the PUSCH according to the MCS table. Here, the transmitter 111 may perform transmission on the PUSCH according to the MCS table in the target frequency resource to which the TP information is applied.

Furthermore, if the control unit 120 determines not to apply the transform precoder, the transmitting unit 111 transmits an uplink signal to which the transform precoder is not applied in the target frequency resource. Further, when the control unit 120 generates a DMRS sequence related to the PUSCH using the second parameter, the transmitting unit 111 may transmit the DMRS related to the PUSCH. Here, the transmitter 111 may transmit the DMRS related to the PUSCH in the target frequency resource to which the TP information is applied. Further, when the control unit 120 generates a PTRS sequence related to the PUSCH using the second parameter, the transmitting unit 111 may transmit the PTRS related to the PUSCH. Here, the transmitter 111 may transmit the PTRS related to the PUSCH in the target frequency resource to which the TP information is applied. Further, when the control unit 120 determines the MCS table using the second parameter, the transmitting unit 111 may perform transmission on the PUSCH according to the MCS table. Here, the transmitter 111 may perform transmission on the PUSCH according to the MCS table in the target frequency resource to which the TP information is applied.

At a timing (predetermined timing) after a predetermined time has elapsed since receiving the transform precoder information (for example, DCI including TP information), the transmitter 111 transmits an uplink signal to which switching regarding application of the transform precoder has been applied. A link signal may be transmitted to base station 200.

The control unit 120 may determine the predetermined timing based on timing information. For example, the control unit 120 sets the predetermined timing to a timing later than the normal uplink signal transmission timing (normal offset timing) (for example, a slot after a predetermined slot in which the normal uplink signal is to be transmitted). You may decide. Further, the control unit 120 may determine the predetermined timing based on the ability information.

Note that the control unit 120 may return whether or not the transform precoder is applied based on information indicating the validity period of the TP information. That is, when the validity period of the TP information ends, the control unit 120 may restore the switching of application of the transform precoder.

Furthermore, the control unit 120 may start (or trigger or execute) a random access procedure based on reception of the DCI or MAC CE including TP information. For example, the control unit 120 performs a contention-free random access (CFRA) procedure and/or a contention-based random access (CBRA) procedure based on reception of DCI or MAC CE including TP information. Random Access) procedure may be started. For example, the control unit 120 may start a 4-step CFRA procedure and/or a 2-step CFRA procedure based on reception of DCI or MAC CE including TP information. Additionally, a 4-step CBRA procedure and/or a 2-step CBRA procedure may be initiated based on reception of the DCI or MAC CE including TP information. As described above, the control unit 120 may start the CFRA procedure based on receiving the DCI format for the PDCCH order including TP information.

Here, the random access procedure may be executed in an upper layer (for example, MAC layer) in the UE 100. That is, when the lower layer (e.g., physical layer) in the UE 100 receives the DCI including the TP information, the lower layer (e.g., the physical layer) transmits the TP information (or the DCI containing the TP information) to the upper layer (e.g., the MAC layer). May be supplied (or instructed). Moreover, the upper layer (for example, MAC layer) in UE100 may start a random access procedure based on the supply of the said TP information from a physical layer.

The base station 200 configures (or ). Hereinafter, the physical random access channel resource will also be referred to as PRACH occasion(s). For example, base station 200 may transmit an RRC message that includes information indicating a random access preamble and/or information indicating a PRACH opportunity. For example, the base station 200 may transmit a random access configuration (eg, RACH-ConfigDedicated) that includes information indicating a random access preamble and/or information indicating a PRACH opportunity. Further, as described above, a DCI format for PDCCH order including information indicating a random access preamble may be transmitted. That is, the base station 200 may configure a random access preamble and/or a PRACH opportunity for a random access procedure started based on reception of TP information.

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, in the two-step RA procedure, the UE 100 may perform transmission on the PUSCH after transmitting the random access preamble. Here, the UE 100 may determine whether to apply a transform precoder to the transmission on the PUSCH after transmitting the random access preamble, based on the TP information. For example, the UE 100 may apply a transform precoder to the transmission on the PUSCH after transmitting the random access preamble, based on the TP information. Further, the UE 100 does not need to apply the transform precoder to the 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 the timing (eg, slot, symbol, and/or starting 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 (eg, RACH-ConfigDedicated) that includes timing information.

The UE 100 also 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 also be a PDCCH) to which a CRC scrambled by the C-RNTI is added in order to receive a random access response (that is, receive a random access response on the PDSCH). Here, the base station 200 transmits information indicating a DC monitored time window (also referred to as ra-Response Window) to which a CRC scrambled by C-RNTI is added and/or information indicating a search space set. An RRC message containing the information may be sent. Here, the search space set includes a USS set and/or a CSS set. That is, the base station 200 may set information indicating a time window and/or a search space set for the random access procedure started based on reception of the TP information. For example, the base station 200 transmits an RRC message including information indicating a time window and/or information indicating a search space set, and the UE 100 transmits a C- DCI to which a CRC with scrambled RNTI is added may be monitored. The UE 100 may consider that the random access procedure has been successfully completed based on the reception (or detection) of the DCI with the scrambled CRC added to the C-RNTI.

The UE 100 may also apply a transform precoder according to the TP information based on the successful completion of the random access procedure. Also, the UE 100 may not apply the transform precoder according to the TP information based on the successful completion of the random access procedure. That is, the UE 100 may perform uplink signal transmission according to the TP information based on the successful completion of the random access procedure. Here, the base station 200 may set timing information for uplink signal transmission based on the successful completion of the random access procedure. For example, the base station 200 transmits an RRC message including timing information, and the UE 100 transmits an uplink signal according to the TP information based on the timing information after the random access procedure is successfully completed. May be executed. For example, the UE 100 may perform uplink signal transmission according to the TP information after the random access procedure is successfully completed and after the time timing indicated by the timing information.

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

Furthermore, in the 4-step CBRA procedure, the UE 100 may perform transmission on the PUSCH (or transmission on the UL-SCH) based on the random access response. For example, the UE 100 may perform transmission on the PUSCH based on a random access response grant (RA response permission) included in the random access response (also referred to as message 3). For example, UE 100 may apply a transform precoder to transmission on the PUSCH based on TP information. Furthermore, the UE 100 does not need to apply a transform precoder to transmission on the PUSCH based on the TP information. The base station 200 may set timing information for transmission on the PUSCH. For example, the base station 200 may transmit an RRC message including timing information, and the UE 100 may perform transmission on the PUSCH based on the timing information. That is, the UE 100 may determine the timing of transmission ((eg, slot, symbol, and/or start position)) on the PUSCH based on the timing information. For example, the base station 200 may transmit a random access configuration (eg, RACH-ConfigDedicated) that includes timing information. Furthermore, the base station 200 may include the timing information in the random access response and transmit it.

Additionally, in the 4-step CBRA procedure, the UE 100 may receive contention resolution (also referred to as message 4). For example, the UE 100 may consider that the random access procedure has been successfully completed based on contention resolution reception (or detection). As mentioned above, the UE 100 may apply a transform precoder according to the TP information based on the successful completion of the random access procedure. Also, the UE 100 may not apply the transform precoder according to the TP information based on the successful completion of the random access procedure. That is, the UE 100 may perform uplink signal transmission based on the TP information based on the successful completion of the random access procedure. The base station 200 may also set timing information for uplink signal transmission 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 perform uplink signal transmission based on the timing information after the random access procedure is successfully completed. . For example, the UE 100 may perform uplink signal transmission after the random access procedure is successfully completed and the time timing indicated by the timing information.

As described above, the receiving unit 112 of the UE 100 transmits downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether or not to apply a transform precoder to the base station 200. Receive from. Control unit 120 of UE 100 determines a target frequency resource for transform precoder information. Based on the transform precoder information, the control unit 120 determines whether to apply a transform precoder to the transmission of uplink signals in the target frequency resource. Thereby, the UE 100 can dynamically switch and transmit the waveform of the uplink signal in the target frequency resource targeted by the transform precoder information. Thereby, the UE 100 can dynamically switch and transmit the waveform of the uplink signal in the target frequency resource targeted by the transform precoder information. The base station 200 can receive uplink signals whose waveforms have been dynamically switched.

Furthermore, the control unit 120 determines all serving cells configured for the UE 100 or all uplink BWPs configured for the UE 100 as target frequency resources. As a result, the UE 100 becomes the target of the TP information, so that the base station 200 and the UE 100 can commonly recognize the target frequency resource without exchanging target designation information.

Additionally, the receiving unit 112 may receive target designation information that designates target frequency resources from the base station 200. The control unit 120 may determine the target frequency resource based on the target designation information. Thereby, the recognition of the target frequency resource can be shared between the base station 200 and the UE 100.

Additionally, the target specification information may include information that specifies the serving cell as the target frequency resource. Based on the target designation information, the control unit 120 may determine a designated serving cell among the serving cells configured for the UE 100 as the target frequency resource. Thereby, even if a plurality of serving cells are configured in the UE 100, it is possible to flexibly control the serving cell that is the target of the TP information.

Additionally, the target designation information may include information that designates a cell group as a target frequency resource. Based on the target designation information, the control unit 120 may determine a designated cell group among the cell groups configured for the UE 100 as the target frequency resource. Even if a plurality of cell groups are set in the UE 100, the cell groups that are the targets of TP information can be flexibly controlled.

Additionally, the target designation information may include information that designates uplink BWP as the target frequency resource. Based on the target designation information, the control unit 120 can determine a designated uplink BWP among the uplink BWPs configured for the UE 100 as a target frequency resource. Even if a plurality of uplink BWPs are configured in the UE 100, it is possible to flexibly control the uplink BWP that is the target of TP information.

Additionally, 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 send a larger amount of information than the DCI and MAC CE, making it easier to flexibly specify the target of TP information.

Additionally, the receiving unit 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 TP information compared to RRC signaling.

Additionally, the MAC CE may receive a MAC CE including TP information and target specification information from the base station 200. Thereby, the UE 100 can immediately grasp the target of the TP information.

Additionally, the DCI may be in a DCI format that includes TP information. The control unit 120 may determine at least one of the serving cell and uplink BWP scheduled using the DCI format as the target frequency resource. Thereby, the UE 100 can grasp the target of TP information without explicitly specifying the target of TP information.

Additionally, the DCI may be in a DCI format that includes TP information. The control unit 120 may determine the uplink component carrier corresponding to the downlink component carrier on which the DCI format is received or the uplink BWP corresponding to the downlink BWP on which the DCI format is received as the target frequency resource. Thereby, the UE 100 can grasp the target of TP information without explicitly specifying the target of TP information.

Additionally, the TP information may be first TP information. The receiving unit 112 may receive a radio resource control (RRC) message including second TP information indicating whether to apply a transform precoder from the base station. The control unit 120 may select TP information used for determining whether to apply a transform precoder from among the first TP information and the second TP information. Thereby, application of the transform precoder can be flexibly controlled using the first TP information and the second TP information.

The control unit 120 also determines that the second TP information includes configuration information for configuring communication device-specific physical uplink shared channel (PUSCH) parameters applicable to a specific bandwidth portion (BWP), and dynamic permission. If the first TP information is included in at least one of the configuration information for configuring uplink transmission without the first TP information, the first TP information may be selected. That is, when the control unit 120 receives a communication device-specific parameter including the second TP information (that is, when the second TP information is set as a communication device-specific parameter), the control unit 120 performs a transform preform based on the first TP information. It may also be determined whether or not to apply a coder. Regarding these configuration information, the base station 200 can switch whether to apply the transform precoder at an appropriate timing using lower layer signaling. Furthermore, the base station 200 can perform efficient transform precoder switching specific to the communication device.

Further, the control unit 120 may select the second TP information when the second TP information is included in the setting information regarding the random access procedure. That is, when the control unit 120 receives a cell-specific parameter including the second TP information (that is, when the second TP information is set as a cell-specific parameter), the control unit 120 executes a transform precoder based on the second TP information. You may decide whether to apply it or not. Thereby, base station 200 can perform optimal transform precoder switching in consideration of the situation of the entire cell.

Additionally, the receiving unit 112 may receive from the base station 200 a radio resource control (RRC) message that includes information regarding a field in the DCI that includes TP information. Thereby, the UE 100 can understand whether or not the DCI includes TP information.

Additionally, the receiving unit 112 may receive from the base station 200 a radio resource control (RRC) message including configuration information for monitoring DCI including TP information. Thereby, the UE 100 can understand whether or not the DCI includes TP information. Furthermore, the UE 100 can control a control resource set (i.e., a resource in the frequency domain) and/or a search space set (i.e., a resource in the time domain) for monitoring DCI including TP information.

Additionally, the receiving unit 112 may receive from the base station 200 a MAC CE that includes TP information and a specific logical channel identifier for identifying the MAC CE that includes the TP information. Thereby, the UE 100 can grasp whether TP information is included in the MAC CE.

Additionally, the receiving unit 112 receives downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder from the base station 200. Regarding the parameters set for the target of transform precoder information, the control unit 120 includes a first parameter used when a transform precoder is applied, and a first parameter used when a transform precoder is not applied. The second parameter to be used is determined. As a result, the UE 100 determines 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, so that the transform precoder It is possible to switch parameters related to the application of , and dynamic parameter switching becomes possible.

The receiving unit 112 may receive an RRC message that includes both the first parameter and the second parameter. Thereby, after receiving the RRC message, the UE 100 can dynamically switch whether or not to apply the transform precoder using lower layer signaling.

The control unit 120 may suspend parameters that are not used for transmitting uplink signals among the first parameters and second parameters. Accordingly, since the parameters are suspended, the control unit 120 can use the parameters without delay when a parameter not used for transmitting an uplink signal is switched to be used for transmitting an uplink signal.

The receiving unit 112 may receive downlink control information (DCI) or medium access control element (MAC CE) including TP information indicating whether to apply a transform precoder from the base station 200. The control unit 120 switches whether or not to apply a transform precoder to the transmission of uplink signals based on the TP information. The transmitter 111 transmits the uplink signal to which the switching has been applied to the base station 200 at a timing after a predetermined time has elapsed since receiving the TP information. Furthermore, the transmitter 211 transmits to the UE 100 DCI or MAC CE including TP information indicating whether or not to apply a transform precoder. The receiving unit 112 receives, from the UE 100, an uplink signal to which the application of the transform precoder has been switched based on the TP information at a timing after a predetermined time has elapsed since the reception of the TP information. For example, due to the communication capability of the UE 100, it may not be possible to transmit an uplink signal to the base station 200 immediately after receiving the TP information. The UE 100 can switch at an appropriate timing by transmitting the uplink signal to which the switching has been applied to the base station 200 after a predetermined period of time has elapsed.

Additionally, the receiving unit 112 may receive an RRC message that includes timing information for determining the predetermined timing. The control unit 120 may determine the timing based on timing information. Thereby, the base station 200 can control the transmission timing of uplink signals to which switching has been applied.

Additionally, the RRC message may include configuration information regarding PUSCH configuration. The configuration information may include timing information that is applied individually to the configuration information. Thereby, predetermined timing can be individually controlled for each PUSCH based on each setting information.

Additionally, the timing information may include information common to multiple types of setting information regarding PUSCH. Thereby, it is possible to omit transmitting information common to multiple types of setting information to the UE 100, and communication resources can be saved.

Additionally, the timing information may include information indicating the time until a predetermined timing based on reception of the PDCCH. Thereby, the base station 200 can control the transmission timing of uplink signals to which switching is applied after the UE 100 receives the PDCCH.

Additionally, the timing information may include information indicating the validity period of the TP information. Thereby, the validity period of the TP information can be shared between the base station 200 and the UE 100, and the base station 200 can appropriately receive the uplink signal to which switching has been applied.

Additionally, the transmitter 111 may transmit capability information indicating the capability of the UE 100, which is used to determine the predetermined time, to the base station. Thereby, the base station 200 can determine the predetermined time after considering the capabilities of the UE 100. Thereby, the base station 200 can control the uplink signal to be transmitted at a timing when the UE 100 can transmit the uplink signal to which the switching has been applied.

Additionally, the control unit 120 may determine the predetermined timing based on the capabilities of the UE 100. Thereby, the UE 100 can transmit the uplink signal to which the switching has been applied at an appropriate timing.

(Second operation example)
A second operation example of the mobile communication system 1 will be described with reference to FIG. 7. Descriptions of parts similar to those in the above-mentioned operation example may be omitted. In the second operation example, the UE 100 transmits an uplink signal to which switching regarding the transform precoder is applied to the base station 200 at a timing after transmitting a response based on reception of TP information.

Step S201 to Step S204: Corresponds to Step S102 to Step S105.

The control unit 120 may execute the process of step S205 based on the reception of the TP information. Therefore, the TP information may trigger the sending of a response.

Step S205:
The transmitter 111 of the UE 100 may transmit a response to the base station 200 based on the reception of the TP information. The receiving unit 212 of the base station 200 may receive a response from the UE 100 based on the reception of the TP information.

The transmitter 111 may transmit the MAC CE to the base station 200 as a response. Therefore, the response may be MAC CE. The response may be a new MAC CE indicating a response based on receipt of the TP information. The new MAC CE may be called, for example, a transform precoder confirmation.

The MAC CE as a response may include a specific logical channel identifier (LCID) to identify the response. For example, the control unit 230 of the base station 200 may determine that the UE 100 makes a determination regarding application of the transform precoder based on TP information in response to reception of a MAC CE including a specific LCID.

The payload of the MAC CE as a response may be 0 bits or may be multiple bits. For example, the control unit 230 of the base station 200 may determine that the UE 100 makes a determination regarding application of the transform precoder based on the TP information in response to receiving a MAC CE with a payload of 0 bits. Note that the MAC CE as a response may be different from general acknowledgment information (ACK).

The transmitter 111 may transmit the response in the target frequency resource. The transmitter 111 transmits one or more (or all) cell groups determined as target frequency resources, one or more (or all) serving cells determined as target frequency resources, and/or one or more (or all) cell groups determined as target frequency resources. A response may be sent for each of the determined one or more (or all) uplink BWPs.

Step S206: Corresponds to step S105.

The transmitter 111 of the UE 100 transmits the uplink signal to which the application of the transform precoder has been switched to the base station 200 at a predetermined timing after transmitting the response in step S205.

The control unit 120 may determine the predetermined timing based on the timing information. The timing information may include, for example, information indicating the timing after a predetermined period of time has elapsed based on the transmission of the response. A slot after a predetermined slot based on the slot in which the response was transmitted may be determined as the predetermined timing for transmitting the uplink signal to which switching has been applied.

As described above, the transmitter 111 may transmit a response to the base station 200 based on the reception of TP information. The predetermined timing may be a timing after transmitting the response. Thereby, the base station 200 can determine to receive an uplink signal before switching is applied until it receives a response. Base station 200 can appropriately receive uplink signals even if application of a transform precoder using lower layer signaling is implemented.

Additionally, the MAC CE may include transform precoder information. The transmitter 111 may transmit the MAC CE to the base station 200 as a response. Thereby, the base station 200 can determine that it receives an uplink signal before switching is applied until it receives the MAC CE as a response.

Additionally, the MAC CE may include a specific LCID to identify it as a response. The base station 200 can determine that the MAC CE that includes a specific LCID is the above response.

Additionally, the payload of the MAC CE may be 0 bits. This saves communication resources.

(Third operation example)
A third operation example of the mobile communication system 1 will be described with reference to FIG. 8. Descriptions of parts similar to those in the above-mentioned operation example may be omitted. In the third operation example, the UE 100 transmits an uplink signal to which switching regarding the transform precoder is applied to the base station 200 at a timing after transmitting the RA preamble.

Steps S301 to S302: Corresponds to steps S102 to S103.

The transmitter 211 of the base station 200 may transmit the TP information to the UE 100. The receiving unit 112 of the UE 100 may receive the RA preamble assignment from the base station 200.

The transmitter 211 may transmit the TP information and RA preamble allocation to the UE 100. The RA preamble assignment may be included in the DCI containing TP information. The transmitter 211 may transmit the TP information and information for setting and/or instructing a set of PRACH occasions to the UE 100.

The control unit 120 of the UE 100 may start the RA procedure based on reception of the TP information. The RA procedure may be, for example, contention free random access (CFRA). The RA procedure may be, for example, a four-step CFRA or a two-step CFRA.

The physical layer of the control unit 120 of the UE 100 may supply the DCI to the MAC layer of the control unit 120 when receiving the DCI including TP information. The MAC layer may initiate the RA procedure when provided with a DCI containing TP information.

Steps S303 to S304: Corresponds to steps S104 to S105.

Step S305:
The transmitter 111 of the UE 100 transmits the RA preamble to the base station 200. The receiving unit 221 of the base station 200 receives the RA preamble from the UE 100. The transmitter 111 may transmit the assigned RA preamble to the base station 200. The transmitter 111 may transmit to the base station 200 using the PRACH opportunity. Note that the RA preamble may be rephrased as, for example, message 1 (Msg.1), PRACH, RACH, or RACH preamble, sequence, or preamble.

Step S306: Corresponds to step S106.

The transmitter 111 of the UE 100 transmits the uplink signal to which the application of the transform precoder has been switched to the base station 200 at a predetermined timing after transmitting the RA preamble. Therefore, the predetermined timing is the timing after starting the RA procedure. Specifically, in this operation example, the predetermined timing is the timing after transmitting the RA preamble.

The control unit 120 may determine the predetermined timing based on the timing information. The timing information may include, for example, information indicating the timing after a predetermined period of time has elapsed based on the transmission of the RA preamble. A slot after a predetermined slot based on the slot in which the RA preamble was transmitted may be determined as the predetermined timing for transmitting the uplink signal to which switching has been applied.

As described above, the control unit 120 may start the random access procedure based on reception of TP information. The predetermined timing may be a timing after starting the RA procedure. Thereby, it can be determined that the base station 200 receives an uplink signal before switching is applied until the RA procedure is started. The UE 100 and the base station 200 can easily grasp the timing of uplink signals to which switching is applied.

Additionally, the transmitter 111 may transmit an RA preamble to the base station 200 in the RA procedure. The predetermined timing may be a timing after transmitting the RA preamble. Thereby, it can be determined that the base station 200 receives an uplink signal before switching is applied until the RA preamble is transmitted. The UE 100 and the base station 200 can easily grasp the timing of uplink signals to which switching is applied.

(Fourth operation example)
A fourth operation example of the mobile communication system 1 will be described with reference to FIG. 9. Descriptions of parts similar to those in the above-mentioned operation example may be omitted. In the fourth operation example, the UE 100 transmits an uplink signal to which switching regarding the transform precoder is applied to the base station 200 at a timing after receiving the RA response.

Steps S401 to 405: Corresponds to steps S301 to S305.

Step S406:
The transmitter 211 of the base station 200 transmits the RA preamble response to the UE 100. Receiving section 112 of UE 100 receives the RA preamble response from base station 200.

The RA preamble response may include a timing advance (TA) command. The control unit 120 may process the TA command. Specifically, the control unit 120 adjusts the transmission timing of uplink signals based on the TA command.

Step S407: Corresponds to step S106.

The transmitter 111 of the UE 100 transmits the uplink signal to which the application of the transform precoder has been switched to the base station 200 at a predetermined timing after receiving the RA preamble response. Therefore, the predetermined timing is the timing after starting the RA procedure.

The predetermined timing may be a timing after successful completion of the RA procedure. Therefore, the transmitter 111 may transmit the switched uplink signal to the base station 200 at a timing after the RA procedure is completed. For example, the receiving unit 112 may receive a PDCCH that has been CRC scrambled using the C-RNTI assigned to the UE 100. When the control unit 120 receives the PDCCH, the control unit 120 may consider that the RA procedure has been successfully completed. The transmitter 111 may transmit the uplink signal to which the switching has been applied to the base station 200 at a timing after the RA procedure is deemed to have been successfully completed.

Additionally, the predetermined timing may be the timing after processing the TA command. The transmitter 111 may transmit the switched uplink signal to the base station 200 at a timing after processing the TA command. Note that the C-RNTI may be an identifier assigned by the base station 200 before starting the RA procedure of this operational example.

The control unit 120 may determine the predetermined timing based on the timing information. The timing information may include, for example, information indicating the timing after a predetermined period of time has elapsed based on the reception of the RA preamble response. A slot after a predetermined slot based on the slot in which the RA preamble response was received may be determined as the predetermined timing for transmitting the uplink signal to which switching has been applied.

As described above, the receiving unit 112 may receive the RA response from the base station 200. The predetermined timing may be a timing after receiving the RA response. Thereby, the base station 200 and the UE 100 can determine that the uplink signal before switching is applied is received until the UE 100 receives the RA response. The UE 100 and the base station 200 can easily grasp the timing of uplink signals to which switching is applied.

Additionally, the receiving unit 112 may receive the PDCCH that has been CRC scrambled using the C-RNTI assigned to the UE 100. When the control unit 120 receives the PDCCH, the control unit 120 may consider that the RA procedure has been successfully completed. The predetermined timing may be a timing after completion of the RA procedure. Thereby, the base station 200 and the UE 100 can determine that the uplink signal before switching is applied is received until the UE 100 receives the PDCCH. The UE 100 and the base station 200 can easily grasp the timing of uplink signals to which switching is applied.

Additionally, the control unit 120 may process the TA command included in the RA response. The predetermined timing may be the timing after processing the TA command. As a result, since the transmission timing of uplink signals is adjusted by the TA command, for example, even if the UE 100 continues to move, the base station 200 can appropriately transmit the uplink signals to which switching has been applied. can be received.

(Other embodiments)
In the above-described embodiment, the uplink signal whose waveform is determined based on the TPI has been described using PUSCH as an example, but the present invention is not limited to this. Similar operations may be performed for other upstream signals (eg, PTRS, etc.) and other signals (eg, sidelink signals, etc.).

In the above-described embodiment (for example, the third operation example), a four-step CFRA was used as an example, but the present invention is not limited to this. The UE 100 may initiate two-step CFRA based on receiving the TP information.

In the above-described embodiment, the mobile communication system 1 was explained using an NR-based mobile communication system as an example. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a system compliant with any TS of LTE (Long Term Evolution) or another generation system (for example, 6th generation) of the 3GPP standard. Base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination towards UE 100 in LTE. The mobile communication system 1 may be a system compliant with a 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.

In the above-described embodiment, the mobile communication system 1 was explained using an NR-based mobile communication system as an example. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a system compliant with any TS of LTE or other generation systems (for example, 6th generation) of the 3GPP standard. Base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination towards UE 100 in LTE. The mobile communication system 1 may be a system compliant with a TS of a standard other than the 3GPP standard.

The steps in the operation of the embodiments described above do not necessarily have to be executed in chronological order in the order described in the flow diagram or sequence diagram. For example, steps in an operation may be performed in a different order than depicted in a flow diagram or sequence diagram, or in parallel. Also, some of the steps in the operation may be deleted, and additional steps may be added to the process. Furthermore, each of the above-mentioned operation flows is not limited to being implemented separately, but can be implemented by combining two or more operation flows. For example, some steps of one operation flow may be added to another operation flow, or some steps of one operation flow may be replaced with some steps of another operation flow.

A program that causes a computer to execute each process performed by the UE 100 or the base station 200 may be provided. The program may be recorded on a computer readable medium. Computer-readable media allow programs to be installed on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. Non-transitory recording media are not particularly limited, but include, for example, CD-ROM (Compact Disk Read Only Memory) and DVD-ROM (Digital Versatile Disc Read Only Memory). Even if it is a recording medium such as good. Further, circuits that execute each process performed by the UE 100 or the base station 200 may be integrated, and at least a portion of the UE 100 or the base station 200 may be configured as a semiconductor integrated circuit (chip set, SoC (System On Chip)).

In the embodiments described above, "transmit" may mean processing at least one layer within a protocol stack used for transmission, or physically transmitting a signal wirelessly or by wire. It may also mean sending to. Alternatively, "transmitting" may mean a combination of processing the at least one layer and physically transmitting the signal wirelessly or by wire. Similarly, "receive" may mean processing at least one layer within the protocol stack used for receiving, or physically receiving a signal, wirelessly or by wire. It can also mean that. Alternatively, "receiving" may mean a combination of processing the at least one layer and physically receiving the signal wirelessly or by wire. Similarly, "obtain/acquire" may mean obtaining information from among stored information, and may refer to obtaining information from among information received from other nodes. Alternatively, it may mean obtaining information by generating the information. Similarly, the words "based on" or "depending on/in response to" refer to "based solely on" or "only in response to," unless expressly stated otherwise. ” does not mean. Reference to "based on" means both "based solely on" and "based at least in part on." Similarly, the phrase "in accordance with" means both "in accordance with" and "in accordance with, at least in part." Similarly, "include" and "comprise" do not mean to include only the listed items; they may include only the listed items, or in addition to the listed items. This means that it may contain further items. Similarly, in this disclosure, "or" does not mean exclusive disjunction, but rather disjunction. Furthermore, any reference to elements using the designations "first," "second," etc. used in this disclosure does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed therein or that the first element must precede the second element in any way. In this disclosure, when articles are added by translation, for example, a, an, and the in English, these articles are used in the plural unless the context clearly indicates otherwise. shall include things.

Although the present disclosure has been described based on examples, it is understood that the present disclosure is not limited to the examples or structures. The present disclosure also includes various modifications and equivalent modifications. In addition, various combinations and configurations, as well as other combinations and configurations that include only one, more, or fewer elements, are within the scope and scope of the present disclosure.

(Additional note)
Additional notes will be made regarding the features of the above-described embodiments.

(Additional note 1)
a receiving unit that receives downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder from a base station;
a control unit that switches whether or not to apply the transform precoder to transmission of uplink signals based on the transform precoder information;
A communication device, comprising: a transmitter that transmits the uplink signal to which the switching has been applied to the base station at a timing after a predetermined time has elapsed after receiving the transform precoder information.

(Additional note 2)
The receiving unit receives a radio resource control (RRC) message including timing information for determining the timing,
The communication device according to supplementary note 1, wherein the control unit determines the timing based on the timing information.

(Additional note 3)
The RRC message includes configuration information regarding the configuration of a physical uplink shared channel (PUSCH),
The communication device according to supplementary note 2, wherein the configuration information includes the timing information that is individually applied to the configuration information.

(Additional note 4)
The communication device according to appendix 2 or 3, wherein the timing information includes information common to multiple types of configuration information regarding a physical uplink shared channel (PUSCH).

(Appendix 5)
The communication device according to any one of Supplementary Notes 2 to 4, wherein the timing information includes information indicating the time up to the timing based on reception of a physical downlink control channel (PDCCH).

(Appendix 6)
The communication device according to any one of Supplementary Notes 2 to 5, wherein the timing information includes information indicating a valid period of the transform precoder information.

(Appendix 7)
The communication device according to any one of Supplementary Notes 1 to 6, wherein the transmitting unit transmits capability information indicating a capability of the communication device used for determining the predetermined time to the base station.

(Appendix 8)
The communication device according to any one of Supplementary Notes 1 to 7, wherein the control unit determines the timing based on the capability of the communication device.

(Appendix 9)
The transmitter transmits a response based on reception of the transform precoder information to the base station,
The communication device according to any one of Supplementary Notes 1 to 8, wherein the timing is a timing after transmitting the response.

(Appendix 10)
The MAC CE includes the transform precoder information,
The communication device according to appendix 9, wherein the transmitter transmits a MAC CE to the base station as the response.

(Appendix 11)
The communication device according to attachment 10, wherein the MAC CE includes a specific logical channel identifier for identifying the response.

(Appendix 12)
The communication device according to supplementary note 10 or 11, wherein the payload of the MAC CE is 0 bits.

(Appendix 13)
The control unit starts a random access procedure based on reception of the transform precoder information,
The communication device according to any one of Supplementary Notes 1 to 12, wherein the timing is a timing after starting the random access procedure.

(Appendix 14)
The transmitting unit transmits a random access preamble to the base station in the random access procedure,
The communication device according to appendix 13, wherein the timing is a timing after transmitting the random access preamble.

(Appendix 15)
The receiving unit receives a random access response from the base station in the random access procedure,
The communication device according to supplementary note 13, wherein the timing is a timing after receiving the random access response.

(Appendix 16)
The receiving unit receives a CRC-scrambled physical downlink control channel (PDCCH) using a cell radio network temporary identifier (C-RNTI) assigned to the communication device,
The control unit considers that the random access procedure has been successfully completed when receiving the PDCCH,
The communication device according to appendix 15, wherein the timing is a timing after completion of the random access procedure.

(Appendix 17)
The control unit processes a timing advance (TA) command included in the random access response,
The communication device according to appendix 15 or 16, wherein the timing is a timing after processing the TA command.

(Appendix 18)
a transmitter that transmits downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether or not to apply a transform precoder to the communication device;
At a timing after a predetermined period of time has elapsed since the communication device received the transform precoder information, the communication device receives an uplink signal to which application switching of the transform precoder has been applied based on the transform precoder information. A base station, comprising: a receiving unit that receives data from the communication device.

(Appendix 19)
A communication method executed by a communication device, the communication method comprising:
receiving from the base station downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder;
switching whether or not to apply the transform precoder to transmission of uplink signals based on the transform precoder information;
A communication method, comprising the step of transmitting the uplink signal to which the switching has been applied to the base station at a timing after a predetermined time has elapsed since the transform precoder information was transmitted.

Claims

a receiving unit (112) that receives downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder from a base station (210);
a control unit (120) that switches whether or not to apply the transform precoder to transmission of uplink signals based on the transform precoder information;
A communication device (100) comprising: a transmitter (111) that transmits the uplink signal to which the switching has been applied to the base station at a timing after a predetermined time has elapsed after receiving the transform precoder information. .
The receiving unit receives a radio resource control (RRC) message including timing information for determining the timing,
The communication device according to claim 1, wherein the control unit determines the timing based on the timing information.
The RRC message includes configuration information regarding the configuration of a physical uplink shared channel (PUSCH),
The communication device according to claim 2, wherein the configuration information includes the timing information that is applied individually to the configuration information.
The communication device according to claim 2 or 3, wherein the timing information includes information common to multiple types of configuration information regarding a physical uplink shared channel (PUSCH).
The communication device according to claim 2 or 3, wherein the timing information includes information indicating the time up to the timing based on reception of a physical downlink control channel (PDCCH).
The communication device according to claim 2 or 3, wherein the timing information includes information indicating a valid period of the transform precoder information.
The communication device according to any one of claims 1 to 3, wherein the transmitting unit transmits capability information indicating a capability of the communication device used for determining the predetermined time to the base station.
The communication device according to any one of claims 1 to 3, wherein the control unit determines the timing based on the capability of the communication device.
The transmitter transmits a response based on reception of the transform precoder information to the base station,
The communication device according to any one of claims 1 to 3, wherein the timing is a timing after transmitting the response.
The MAC CE includes the transform precoder information,
The communication device according to claim 9, wherein the transmitter transmits a MAC CE to the base station as the response.
The communication device according to claim 10, wherein the MAC CE includes a specific logical channel identifier for identifying the response.
The communication device according to claim 10, wherein the payload of the MAC CE is 0 bits.
The control unit starts a random access procedure based on reception of the transform precoder information,
The communication device according to claim 1 , wherein the timing is a timing after starting the random access procedure.
The transmitting unit transmits a random access preamble to the base station in the random access procedure,
The communication device according to claim 13, wherein the timing is a timing after transmitting the random access preamble.
The receiving unit receives a random access response from the base station in the random access procedure,
The communication device according to claim 13, wherein the timing is a timing after receiving the random access response.
The receiving unit receives a CRC-scrambled physical downlink control channel (PDCCH) using a cell radio network temporary identifier (C-RNTI) assigned to the communication device,
The control unit considers that the random access procedure has been successfully completed when receiving the PDCCH,
The communication device according to claim 15, wherein the timing is a timing after completion of the random access procedure.
The control unit processes a timing advance (TA) command included in the random access response,
The communication device according to claim 15, wherein the timing is a timing after processing the TA command.
a transmitter (211) that transmits downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder to the communication device (100);
At a timing after a predetermined period of time has elapsed since the communication device received the transform precoder information, the communication device receives an uplink signal to which application switching of the transform precoder has been applied based on the transform precoder information. A base station (210) comprising: a receiving unit (212) that receives data from the communication device.
A communication method executed by a communication device (100), comprising:
receiving from the base station (210) downlink control information (DCI) or medium access control element (MAC CE) including transform precoder information indicating whether to apply a transform precoder;
switching whether or not to apply the transform precoder to transmission of uplink signals based on the transform precoder information;
A communication method, comprising the step of transmitting the uplink signal to which the switching has been applied to the base station at a timing after a predetermined time has elapsed since the transform precoder information was transmitted.