JP7824115B2 - Terminal device, base station device, and communication method - Google Patents

Description

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

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

3GPP is currently studying and standardizing the next-generation standard (NR: New Radio) as the communications method for 5G. NR is expected to meet the requirements of three scenarios: eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication) within a single technology framework.

Augmented reality and cloud gaming are being considered as new use cases and services (Non-Patent Document 1). Augmented reality and cloud gaming are characterized by quasi-periodic traffic with high data rates.

"Title: New SID on XR Enhancements for NR", RP-213558, Nokia. 3GPP TSG RAN Meeting #94e, Dec.6-17, 2021

In order to efficiently support new services such as augmented reality and cloud gaming, there is a need for improved capacity specialized for these services. One aspect of the present invention provides a terminal device, a communication method used in the terminal device, a base station device, and a communication method used in the base station device that can efficiently support these services.

(1) A first aspect of the present invention is a terminal device having a processor and a memory for storing computer program code, which performs operations including associating multiple SPS configurations with multiple search area configurations, receiving a DCI format including information indicating an index, and setting the SPS configuration and the search area configuration to be associated with the index.

(2) Furthermore, a CSI feedback configuration is further associated with the association between the SPS configuration and the search space configuration, and the CSI feedback configuration associated with the index is further set.

(3) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of: associating a plurality of SPS configurations with a plurality of search space configurations; receiving a DCI format including information indicating an index; and receiving the SPS corresponding to the index.
and setting the configuration of the PS and the configuration of the search area.

(4) Furthermore, a CSI feedback configuration is further associated with the association between the SPS configuration and the search space configuration, and the CSI feedback configuration associated with the index is further set.

(5) A third aspect of the present invention is a base station device having a processor and a memory for storing computer program code, which performs operations including associating multiple SPS configurations with multiple search area configurations, and transmitting a DCI format to a terminal device, the DCI format including an index indicating the associated SPS configuration and the search area configuration.

(6) Furthermore, the CSI feedback configuration is further associated with the association between the SPS configuration and the search space configuration.

(7) A fourth aspect of the present invention is a communication method used in a base station device, comprising:
The method includes a step of associating the SPS configuration with a plurality of search area configurations, and a step of transmitting a DCI format to a terminal device, the DCI format including an index indicating the associated SPS configuration and search area configuration.

(8) Furthermore, the CSI feedback configuration is further associated with the association between the SPS configuration and the search space configuration.

This invention enables efficient resource utilization between terminal devices and base station devices.

1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. 1 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. FIG. 2 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of the present embodiment. FIG. 10 is a diagram illustrating an example of a process for switching the configuration of XR transmission of the terminal device 1 according to one aspect of the present embodiment. FIG. 10 is a diagram illustrating an example of the configuration of XR transmission according to one aspect of the present embodiment. FIG. 10 is a diagram illustrating an example of the configuration of XR transmission according to one aspect of the present embodiment.

The following describes an embodiment of the present invention.

"A and/or B" may be a term including "A", "B", or "A and B".

A parameter or information indicating one or more values may mean that the parameter or information includes at least a parameter or information indicating the one or more values. The upper layer parameter may be a single upper layer parameter. The upper layer parameter may be an information element (IE) including multiple parameters.

Fig. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In Fig. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3 (gNB). Hereinafter, the terminal devices 1A to 1C are also referred to as terminal devices 1 (UE).

The base station device 3 is a MCG (Master Cell Group) and an SCG (Secondary Cell Group).
The MCG may be configured to include one or both of the above. The MCG is a group of serving cells configured to include at least a PCell (Primary Cell). The SCG is a group of serving cells configured to include at least a PSCell (Primary Secondary Cell). The PCell is a cell on which an initial connection establishment procedure or a connection re-establishment procedure is performed by the terminal device 1 (the cell on which the procedure has been performed). The PSCell is a serving cell on which a random access procedure is performed by the terminal device 1. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. The serving cell identity is a short identifier for identifying the serving cell. The serving cell identity may be provided by a higher layer parameter.

A serving cell group (cell group) is a general term for an MCG, an SCG, and a PUCCH cell group. A serving cell group may include one or more serving cells (or component carriers). One or more serving cells (or component carriers) included in a serving cell group may be operated by carrier aggregation.

The base station device 3 communicates with the terminal device 1 using different frequency bands (carrier frequencies, frequency spectrums). This operation (multi-carrier operation) may be referred to as carrier aggregation or dual connectivity. Different cells (serving cells) use different frequency bands. In the base station device 3 and the terminal device 1, the multiple cells used in carrier aggregation may be such that one cell uses the downlink frequency band and the uplink frequency band, and the other cells use only the downlink frequency band, or the other cells may also use the downlink frequency band and the uplink frequency band. The terminal device 1 makes an initial connection with the base station device 3, and after the connection with the base station device 3 is established, multiple cell connections are added. A frequency band to be used for communication is added to the terminal device 1. A cell (serving cell) to be used for communication is added to the terminal device 1. A connection with the base station device 3 is added to the terminal device 1.

In a wireless communication system, the terminal device 1 and the base station device 3 may use one or more communication methods. For example, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) may be used in the downlink of the wireless communication system. Furthermore, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which transformed precoding is applied prior to signal generation in CP-OFDM. Here, transformed precoding is also referred to as DFT precoding.

As shown in FIG. 1, base station device 3 may be configured with one transceiver device (or transmission point, transmission device, reception point, reception device, transmission/reception point). On the other hand, in some cases, base station device 3 may be configured to include multiple transceivers. When base station device 3 is configured with multiple transceivers, each of the multiple transceivers may be located in a different geographical location.

Subcarrier spacing (SCS) for a given subcarrier spacing setting μ
Δf may be Δf=2 ^μ ×15 kHz. For example, the subcarrier spacing setting μ may indicate any of 0, 1, 2, 3, and 4.

A time unit _Tc = 1/( _Δfmax × _Nf ) may be used to express the length of the time domain. Here, _Δfmax = 480 kHz. Also, _Nf = 4096. Furthermore, the constant κ is given by κ = _Δfmax × _Nf / ( _Δfref Nf _,r
ef ) may be 64. Also, Δf _ref may be 15 kHz _.
f is 2048.

Downlink/uplink signal transmission may be organized into radio frames (system frames, frames) of length Tf, where Tf = (Δfmax × Nf/100) × Ts = 10 ms.

A radio frame may be configured to include 10 subframes. Here, the subframe length Tsf may be (Δfmax × Nf/1000) × Ts = 1 ms. Furthermore, the number of OFDM symbols per subframe may be Nsubframe, μsymb = Nslotsymb × Nsubframe, μslot.

An OFDM symbol is used as a time domain unit for a communication scheme used in a wireless communication system. For example, an OFDM symbol may be used as a time domain unit for CP-OFDM. Also, an OFDM symbol may be used as a time domain unit for DFT-s-OFDM.

A slot may be composed of multiple OFDM symbols. For example, one slot may be composed of Nslotsymb consecutive OFDM symbols. For example, in a normal CP setting, Nslotsymb = 14. In an extended CP setting, Nslotsymb = 12.

The slots may be indexed in the time domain. For example, the slot index nμs may be given in ascending order as integer values ranging from 0 to Nsubframe,μslot−1 in subframes. Also, the slot index nμs,f may be given in ascending order as integer values ranging from 0 to Nframe,μslot−1 in radio frames.

Figure 2 is a diagram showing an example of the configuration of a resource grid according to one aspect of this embodiment. In the resource grid of Figure 2, the horizontal axis represents the OFDM symbol index lsym, and the vertical axis represents the subcarrier index ksc. The resource grid of Figure 2 includes Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, and x represent the bandwidth of the SCS-specific carrier. The values of Nsize, μgrid, and x are expressed in resource blocks.

Within the resource grid, a resource identified by a subcarrier index ksc and an OFDM symbol index lsym is called a Resource Element (RE).
It is also called.

A resource block (RB) includes NRBsc consecutive subcarriers. The resource block is a collective term for a common resource block, a physical resource block (PRB), and a virtual resource block (VRB). For example, NRBsc may be 12.

A BandWidth Part (BWP) may be configured as a subset of the resource grid.
Here, the BWP set for the downlink is also called a downlink BWP, and the BWP set for the uplink is also called an uplink BWP.

An antenna port may be defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. For example, a channel may correspond to a physical channel. Alternatively, a symbol may correspond to a modulation symbol assigned to a resource element. Here, "channel" may mean "propagation path." Alternatively, "channel" may mean "physical channel."

Two antenna ports are considered to be in a Quasi Co-Located (QCL) relationship if the large-scale properties of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. Here, the large-scale properties may include long-range channel properties. The large-scale properties may include some or all of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. A first antenna port and a second antenna port being QCL with respect to beam parameters may mean that the receive beam assumed by the receiver for the first antenna port and the receive beam assumed by the receiver for the second antenna port are the same (or correspond to each other). The first antenna port and the second antenna port being QCLs in terms of beam parameters may mean that the transmission beam assumed by the receiving side for the first antenna port and the transmission beam assumed by the receiving side for the second antenna port are the same (or correspond to each other). The terminal device 1 may assume that the two antenna ports are QCLs if the large-scale characteristics of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. The two antenna ports being QCLs may mean that the two antenna ports are assumed to be QCLs.

Carrier aggregation may be performing communication using a plurality of aggregated serving cells. Also, carrier aggregation may be performing communication using a plurality of aggregated component carriers. Also, carrier aggregation may be performing communication using a plurality of aggregated downlink component carriers. Also, carrier aggregation may be performing communication using a plurality of aggregated uplink component carriers.

Below, an example configuration of a terminal device 1 according to one aspect of this embodiment is described.

3 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. As shown in the figure, the terminal device 1 includes a radio transmission/reception unit 10 and an upper layer processing unit 14. The radio transmission/reception unit 10 includes at least an antenna unit 11, an RF (Radio Frequency) unit 12, and part or all of a baseband unit 13. The upper layer processing unit 14 includes at least a medium access control layer processing unit 15 and part or all of a radio resource control layer processing unit 16. The radio transmission/reception unit 10 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

The wireless transceiver unit 10 performs physical layer processing.

For example, the radio transceiver 10 may generate a baseband signal of an uplink physical channel. Here, a transport block delivered from a higher layer on the UL-SCH may be mapped to the uplink physical channel. For example, the radio transceiver 10 may generate a baseband signal of an uplink physical signal.

For example, the radio transceiver unit 10 may attempt to detect information transmitted by a downlink physical channel. Here, a transport block of the information transmitted by the downlink physical channel may be delivered to a higher layer on the DL-SCH. For example, the physical layer processing unit 10 may attempt to detect information transmitted by a downlink physical signal.

The receiving unit of the terminal device 1 receives the PDCCH. The receiving processing unit of the terminal device 1 performs processing to receive the PDCCH in the downlink frequency band (cell, component carrier, carrier). The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDCCH.
The reception processing unit performs a process of receiving the PDCCH and a process of detecting downlink control information.

A receiving unit of the terminal device 1 receives the PDSCH. A receiving processing unit of the terminal device 1 performs processing to receive the PDSCH in the downlink frequency band (cell, component carrier, carrier). The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDSCH.

A transmitter (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for a PDSCH. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK in an uplink frequency band (cell, component carrier, carrier).

The upper layer processing unit 14 outputs uplink data (transport blocks) generated by user operations or the like to the radio transceiver unit 10. The upper layer processing unit 14 performs processing on the MAC layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

The media access control layer processing unit (MAC layer processing unit) 15 provided in the upper layer processing unit 14 performs MAC layer processing.

The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs RRC layer processing. The radio resource control layer processing unit 16 processes various setting information/parameters (RRC parameters) of the own device.
The radio resource control layer processing unit 16 sets various setting information/parameters (RRC parameters) based on higher layer signals received from the base station device 3. That is, the radio resource control layer processing unit 16 sets various setting information/parameters (RRC parameters) based on information indicating the various setting information/parameters (RRC parameters) received from the base station device 3. The setting information may include information related to processing or setting of physical channels and physical signals (i.e., the physical layer), the MAC layer, the PDCP layer, the RLC layer, and the RRC layer. The parameters may be higher layer parameters.

For example, the radio resource control layer processing unit 16 may acquire RRC parameters included in an RRC message on a certain logical channel and set the acquired RRC parameters in a storage area of the terminal device 1. The RRC parameters set in the storage area of the terminal device 1 may be provided to a lower layer.

The radio resource control layer processing unit 16 sets a control resource set based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets (configures) a search space within the control resource set. The radio resource control layer processing unit 16 sets (configures) PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets (configures) the number of PDCCH candidates to be monitored within the control resource set. The radio resource control processing unit 16 sets (configures) an aggregation level for the PDCCH candidates to be monitored within the control resource set.

The radio resource control layer processing unit 16 sets a DCI format to be monitored within a control resource set. The radio resource control layer processing unit 16 may set a DCI format to be monitored within a search space. The radio resource control layer processing unit 16 sets a DCI format to be monitored within a control resource set based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 may set a DCI format to be monitored within a search space based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 sets one or more DCI formats to be monitored in the reception processing unit.

The radio resource control layer processing unit 16 performs settings for multiple search areas. Each setting for multiple search areas is indexed.

The radio resource control layer processing unit 16 performs settings related to CSI feedback (transmission of channel state information) based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets the CSI feedback transmission period, the CSI feedback transmission start timing (offset), the CSI feedback information type, etc. The radio resource control layer processing unit 16 performs settings related to multiple CSI feedbacks. The settings related to multiple CSI feedbacks are each indexed.

The radio resource control layer processing unit 16 performs settings related to the SPS based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 configures the SPS resources (PDSCH
The radio resource control layer processing unit 16 configures the period of the SPS resources (SPS resources), the start timing (offset) of the SPS resources (PDSCH resources), the number of HARQ processes configured for the SPS, the offset used to derive the HARQ process ID used for the SPS, the RNTI value for scheduling the SPS, etc. The radio resource control layer processing unit 16 performs configuration related to multiple SPSs. The configuration related to multiple SPSs is assigned an index.

The radio resource control layer processing unit 16 configures carrier aggregation based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 configures a serving cell (secondary cell, primary secondary cell) as part of the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform reception processing using the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform transmission processing using the uplink component carrier configured in the carrier aggregation configuration.

The medium access control layer processing unit (MAC layer processing unit) 15 receives the MAC CE from the base station device 3.
The medium access control layer processing unit (MAC layer processing unit) 15 activates/deactivates the secondary cell based on a MAC Control Element (MAC CE). The medium access control layer processing unit (MAC layer processing unit) 15 outputs information indicating activation/deactivation for multiple serving cells configured by the radio resource control layer processing unit 16 to the radio transceiver unit 10 based on a MAC CE (SCell Activation/Deactivation MAC CEs) including information on activation/deactivation of the secondary cell. The medium access control layer processing unit (MAC layer processing unit) 15 deactivates the secondary cell based on a timer. The medium access control layer processing unit (MAC layer processing unit) 15 determines that scheduling has not been performed for the serving cell by the base station device 3 for a certain period of time by measuring with a timer, deactivates the serving cell, and controls the radio transceiver unit 10.

The radio resource control layer processing unit 16 may include functional information generated based on the functions provided by the terminal device 1 in an RRC message and transmit it to the base station device 3.

The wireless transceiver unit 10 performs modulation, encoding, and transmission processes. The wireless transceiver unit 10 generates a physical signal by encoding data (transport blocks), modulating it, and generating a baseband signal (converting it into a time-continuous signal), and transmits it to the base station device 3.

The radio transceiver unit 10 performs demodulation, decoding, and reception processing. The radio transceiver unit 10 outputs the transport block of information detected based on the demodulation and decoding processing of the received physical signal to the upper layer processing unit 14 over DL-SCH.

The radio transceiver unit 10 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver unit 10 stops monitoring the PDCCH in the deactivated serving cell. For example, the radio transceiver unit 10 stops receiving the PDSCH in the deactivated serving cell. For example, the radio transceiver unit 10 stops transmitting the SRS in the deactivated serving cell. For example, the radio transceiver unit 10 stops transmitting the PUSCH in the deactivated serving cell.

The RF unit 12 converts (down-converts) the signal received via the antenna unit 11 into a baseband signal and removes unnecessary frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to a cyclic prefix (CP) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

The baseband unit 13 performs an Inverse Fast Fourier Transform (IFFT) on the physical signal to generate an OFDM symbol. The baseband unit 13 adds a CP to the generated OFDM symbol to generate a baseband digital signal. The baseband unit 13 converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, and up-converts the analog signal to a carrier frequency.
The RF unit 12 converts the RF signal to generate an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

An example configuration of a base station device 3 according to one aspect of this embodiment is described below.

Figure 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 includes a radio transceiver unit 30 and a higher layer processing unit 34. The radio transceiver unit 30 includes an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The radio transceiver unit 30 is also referred to as a transmitter, receiver, or physical layer processing unit.

The upper layer processing unit 34 processes the Medium Access Control (MAC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Radio Resource Control (RRC) layer. Here, the MAC layer is also referred to as the MAC sublayer. The PDCP layer is also referred to as the PDCP sublayer. The RLC layer is also referred to as the RLC sublayer. The RRC layer is also referred to as the RRC sublayer.

The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing. Here, the MAC layer processing includes mapping between logical channels and transport channels,
or multiplexing multiple MAC SDUs (Service Data Units) into a transport block, decomposing a transport block delivered by the physical layer on the UL-SCH into one or more MAC SDUs, applying HARQ (Hybrid Automatic Repeat reQuest) to the transport block,
and may include some or all of the processing of scheduling requests.

The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs RRC layer processing. RRC layer processing may include some or all of broadcast signal management, RRC connection/RRC idle state management, and RRC reconfiguration. The radio resource control layer processing unit 36 generates downlink data (transport blocks), system information, RRC messages, MAC CE, etc. to be placed on the PDSCH, or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

The radio resource control layer processing unit 36 also manages various setting information/parameters (RRC parameters) for each terminal device 1. The radio resource control layer processing unit 36 may set various setting information/parameters for each terminal device 1 via a signal from an upper layer. That is, the radio resource control layer processing unit 36 transmits/reports information indicating various setting information/parameters. The setting information may be transmitted/reported by a physical channel or physical signal (i.e., physical layer), a MAC layer, a PDCP
The parameters may include information related to processing or configuration of the RLC layer, RRC layer, or RRC layer. The parameters may be higher layer parameters. For example, the radio resource control layer processing unit 36 may include the RRC parameters in an RRC message on a certain logical channel and transmit the RRC parameters to the terminal device 1. Here, the RRC message may be mapped to any one of a BCCH (Broadcast Control CHannel), a CCCH (Common Control CHannel), and a DCCH (Dedicated Control CHannel).

The radio resource control layer processing unit 36 may determine RRC parameters to be transmitted to the terminal device 1 based on the RRC parameters included in the RRC message transmitted from the terminal device 1. Here, the RRC message transmitted from the terminal device 1 may be related to a capability information report of the terminal device 1.

The radio resource control layer processing unit 36 configures a control resource set for the terminal device 1. Multiple PDCCH candidates are configured (configured) within the configured control resource set. The radio resource control layer processing unit 36 configures a search space for the terminal device 1. The radio resource control layer processing unit 36 configures a DCI format to be monitored in the search space for the terminal device 1.

The radio resource control layer processing unit 36 sets the DCI format to be applied to the terminal device 1 within the control resource set. The radio resource control layer processing unit 36 generates RRC signaling indicating the DCI format to be applied to the terminal device 1. The radio resource control layer processing unit 36 sets one or more DCI formats to be applied in the transmission processing unit.

The radio resource control layer processing unit 36 performs configuration for multiple search areas. Each configuration for multiple search areas is indexed.

The radio resource control layer processing unit 36 sets resources for transmitting HARQ-ACK to the terminal device 1. The radio resource control layer processing unit 36 sets resources for transmitting HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier). The radio resource control layer processing unit 36 sets resources for transmitting HARQ-ACK for PDSCH in the uplink frequency band (cell, component carrier, carrier).

The radio resource control layer processing unit 36 performs settings related to CSI feedback (transmission of channel state information) for the terminal device 1. The radio resource control layer processing unit 36 sets the transmission period of CSI feedback, the transmission start timing (offset) of CSI feedback, the type of CSI feedback information, etc. The radio resource control layer processing unit 36 performs settings related to CSI feedback (transmission of channel state information) for the terminal device 1.
Configure feedback settings. Multiple CSI feedback settings are indexed.

The radio resource control layer processing unit 36 performs SPS-related settings for the terminal device 1. The radio resource control layer processing unit 36 sets the period of the SPS resources (PDSCH resources), the start timing (offset) of the SPS resources (PDSCH resources), the number of HARQ processes to be set for the SPS, an offset used to derive the HARQ process ID to be used for the SPS, an RNTI value for SPS scheduling, and the like. The radio resource control layer processing unit 36 performs settings for multiple SPSs. The settings for multiple SPSs are each indexed.

The radio resource control layer processing unit 36 configures carrier aggregation for the terminal device 1. The radio resource control layer processing unit 36 configures a serving cell (secondary cell, primary secondary cell) as part of the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 36 controls the radio transceiver unit 30 to perform transmission processing for the terminal device 1 using the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 36 controls the radio transceiver unit 30 to perform reception processing for the terminal device 1 using the uplink component carrier configured in the carrier aggregation configuration.

The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs (SCell Activation/Deactivation MAC CEs) that instruct activation/deactivation of secondary cells. The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs that instruct activation/deactivation of secondary cells for multiple serving cells configured by the radio resource control layer processing unit 36. The medium access control layer processing unit (MAC layer processing unit) 35 deactivates secondary cells based on a timer. The medium access control layer processing unit (MAC layer processing unit) 35 determines that scheduling has not been performed for a serving cell for a certain period of time by measuring with the timer, deactivates the serving cell, and controls the radio transceiver unit 30.

The functions of the radio transceiver unit 30 are similar to those of the radio transceiver unit 10, so a description thereof will be omitted where appropriate. The radio transceiver unit 30 performs physical layer processing. Here, the physical layer processing may include some or all of the following: generating a baseband signal for a physical channel, generating a baseband signal for a physical signal, detecting information transmitted by the physical channel, and detecting information transmitted by the physical signal. The physical layer processing may also include mapping a transport channel to a physical channel. Here, the baseband signal is also referred to as a time-continuous signal.

The radio transceiver unit 30 may perform one or both of demodulation and decoding processes. The radio transceiver unit 30 may deliver a transport block of information detected based on the demodulation and decoding processes of the received physical signal to a higher layer on the UL-SCH. For example, the radio transceiver unit 30 may generate a baseband signal of a downlink physical channel. Here, the transport block delivered from a higher layer on the DL-SCH may be placed in the downlink physical channel. For example, the radio transceiver unit 30 may generate a baseband signal of a downlink physical signal.

The radio transceiver unit 30 may perform some or all of the modulation processing, encoding processing, and transmission processing. The radio transceiver unit 30 may generate a physical signal based on some or all of the encoding processing, modulation processing, and baseband signal generation processing for the transport block. The radio transceiver unit 30 may map the physical signal to a certain BWP. The radio transceiver unit 30 may transmit the generated physical signal. For example, the radio transceiver unit 30 may attempt to detect information transmitted by an uplink physical channel. Here, the transport block of the information transmitted by the uplink physical channel may be delivered to a higher layer on the UL-SCH. For example, the radio transceiver unit 30 may attempt to detect information transmitted by an uplink physical signal.

The radio transmission/reception unit 30 grasps the SS (Search Space) configured in the terminal device 1. The radio transmission/reception unit 30 grasps the search space in the control resource set configured in the terminal device 1. The radio transmission/reception unit 30 grasps PDCCH candidates monitored in the terminal device 1,
A search space is grasped. The radio transceiver unit 30 grasps which control channel element each PDCCH candidate monitored in the terminal device 1 is configured from (grasping the numbers of the control channel elements that configure the PDCCH candidate). The radio transceiver unit 30 includes an SS grasping unit, which grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates in a control resource set that is configured as a search space of the terminal device. The SS grasping unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search space of the control resource set of the terminal device 1.

The SS ascertaining unit ascertains the configuration of the search space within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the radio transceiver unit 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidates within the search space of the control resource set.

A transmitter (also referred to as a transmission processing unit) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search space set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates in a search space where PDCCH monitoring is performed in the terminal device 1, among multiple search spaces set for the terminal device 1.

The receiving unit (also referred to as the receiving processing unit) of the base station device 3 receives the HARQ-ACK. The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH. The receiving processing unit of the base station device 3 receives the HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3.

The radio transceiver unit 30 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver unit 30 stops transmitting the PDCCH in the deactivated serving cell. For example, the radio transceiver unit 30 stops transmitting the PDSCH in the deactivated serving cell. For example, the radio transceiver unit 30 stops receiving the SRS in the deactivated serving cell. For example, the radio transceiver unit 30
The reception of PUSCH in the deactivated serving cell is stopped.

The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unnecessary frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove a portion corresponding to a cyclic prefix (CP) from the digitized baseband signal. The baseband unit 33 may perform a fast Fourier transform (FFT) on the baseband signal from which the CP has been removed to extract a frequency domain signal.

The baseband unit 33 may generate a baseband signal by performing an inverse fast Fourier transform (IFFT) on the physical signal. The baseband unit 33 may add a CP to the generated baseband signal. The baseband unit 33 may convert the baseband signal with the CP added into an analog signal. The baseband unit 33 may output the analog baseband signal to the RF unit 32.

The RF unit 32 may remove unnecessary frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 may upconvert the baseband signal to a carrier frequency to generate an RF signal. The RF unit 32 may transmit the RF signal via the antenna unit 31. The RF unit 32 may also have a function to control transmission power.

Each of the units designated by reference numerals 10 to 16 in terminal device 1 may be configured as a circuit. Each of the units designated by reference numerals 30 to 36 in base station device 3 may be configured as a circuit.

The following describes the physical channels and physical signals related to various aspects of this embodiment.

Physical signal is a general term for downlink physical channel, downlink physical signal, uplink physical channel, and uplink physical channel. Physical channel is a general term for downlink physical channel and uplink physical channel. Physical signal is a general term for downlink physical signal and uplink physical signal.

An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. The uplink physical channel is a physical channel used in an uplink component carrier. The uplink physical channel may be transmitted by the radio transceiver unit 10. The uplink physical channel may be received by the radio transceiver unit 30. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical channels are used:
・PUCCH (Physical Uplink Control CHannel)
・PUSCH (Physical Uplink Shared CHannel)
・PRACH (Physical Random Access CHannel)

The PUCCH may be used to transmit (transmit) uplink control information (UCI). The uplink control information may be arranged in the PUCCH. The radio transceiver 10 may transmit the PUCCH in which the uplink control information is arranged. The radio transceiver 30 may receive the PUCCH in which the uplink control information is arranged.

The uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) includes Channel State Information (CSI), Scheduling Request (SR), and Hybrid Automatic Repeat Request (HARQ-ACK).
The uplink control information may include some or all of the request ACKnowledgement (ACK) information. Note that the uplink control information may also include information not described above.

Channel state information is also referred to as channel state information bits or channel state information sequences. Scheduling requests are also referred to as scheduling request bits or scheduling request sequences. HARQ-ACK information is also referred to as HARQ-ACK information bits or HARQ-ACK information sequences.

The HARQ-ACK information may be composed of HARQ-ACK bits corresponding to one transport block (TB). The HARQ-ACK bits may indicate an acknowledgement (ACK) or a negative acknowledgement (NACK) corresponding to the transport block. An ACK may indicate that decoding of the transport block has been successfully completed. A NACK may indicate that decoding of the transport block has not been successfully completed. The HARQ-ACK information may include one or more HARQ-ACK bits.

The HARQ-ACK for a transport block is also referred to as the HARQ-ACK for a PDSCH. Here, the "HARQ-ACK for a PDSCH" may refer to the HARQ-ACK for a transport block included in the PDSCH.

The scheduling request may be used to request UL-SCH resources for initial transmission. The scheduling request bit may be used to indicate either a positive SR or a negative SR. When the scheduling request bit indicates a positive SR, this is also referred to as "a positive SR is transmitted (communicated)." A positive SR may indicate that UL-SCH resources for initial transmission are requested by the terminal device 1. When the scheduling request bit indicates a negative SR, this is also referred to as "a negative SR is transmitted (communicated)." A negative SR may indicate that UL-SCH resources for initial transmission are not requested by the terminal device 1.

The channel state information may include some or all of a Channel Quality Indicator (CQI), a Precoder Matrix Indicator (PMI), and a Rank Indicator (RI). The CQI is an indicator related to the quality of the propagation path (e.g., propagation strength) or the quality of the physical channel, the PMI is an indicator related to the precoder, and the RI is an indicator related to the transmission rank (or the number of transmission layers).

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

The PUCCH may have a PUCCH format, where the PUCCH format is
The PUCCH format may be a format of physical layer processing of the PUCCH. Also, the PUCCH format may be a format of information transmitted using the PUCCH.

The PUSCH may be transmitted to convey one or both of uplink control information and a transport block. The PUSCH may be used to convey one or both of uplink control information and a transport block. The PUSCH may be used to transmit at least some or all of the transport block, HARQ-ACK, channel state information, and a scheduling request. The PUSCH is used at least to transmit a random access message 3. The PUSCH may be used to transmit information not described above. The terminal device 1 may transmit a PUSCH in which one or both of uplink control information and a transport block are allocated. The base station device 3 may receive a PUSCH in which one or both of uplink control information and a transport block are allocated.

The PRACH may be transmitted to convey an index of the random access preamble (random access message 1). The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit the random access preamble on the PRACH. The base station device 3 may receive the random access preamble on the PRACH.

The uplink physical signal may correspond to a set of resource elements. The uplink physical signal does not have to be used to transmit information generated in a higher layer. The uplink physical signal may be used to transmit information generated in a physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The radio transceiver unit 10 may transmit the uplink physical signal. The radio transceiver unit 30 may receive the uplink physical signal. In the uplink of the wireless communication system according to one aspect of the present embodiment, some or all of the following uplink physical signals may be used.
・UL DMRS (UpLink Demodulation Reference Signal)
・SRS (Sounding Reference Signal)
・UL PTRS (UpLink Phase Tracking Reference Signal)

UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

A set of antenna ports for DMRSs for a PUSCH (DMRSs associated with a PUSCH, DMRSs included in a PUSCH, and DMRSs corresponding to a PUSCH) may be given based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for DMRSs for a PUSCH may be the same as the set of antenna ports for the PUSCH.

The propagation path of the PUSCH may be estimated from the DMRS for that PUSCH.

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

The propagation path of the PUCCH may be estimated from the DMRS for that PUCCH.

The downlink physical channel may correspond to a set of resource elements that convey information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The radio transceiver unit 30 may transmit the downlink physical channel. The radio transceiver unit 10 may receive the downlink physical channel. In the downlink of the wireless communication system according to one aspect of the present embodiment, some or all of the following downlink physical channels may be used.
・PBCH (Physical Broadcast Channel)
・PDCCH (Physical Downlink Control Channel)
・PDSCH (Physical Downlink Shared Channel)

The PBCH is transmitted to convey either or both the Master Information Block (MIB) and physical layer control information. Here, physical layer control information is information generated in the physical layer. The MIB is an RRC message delivered from higher layers on the Broadcast Control Channel (BCCH).

PDCCH transmits (transmits) downlink control information (DCI).
The downlink control information may be arranged in a PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is arranged. The base station device 3 may transmit the PDCCH in which the downlink control information is arranged.

The downlink control information may be transmitted with a DCI format. The DCI format may be interpreted as a format of the downlink control information. The DCI format may be
It may also be interpreted as a set of downlink control information set in a certain downlink control information format.

The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. Here, the terminal device 1 may monitor the PDCCH to acquire the downlink control information. Unless otherwise specified, the DCI format and downlink control information may be described as equivalent. For example, the base station device 3 may include the downlink control information in a DCI format and transmit it to the terminal device 1. Furthermore, the terminal device 1 may control the radio transceiver unit 10 using the downlink control information included in the detected DCI format.

The downlink control information may include at least either a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for scheduling the PDSCH is also referred to as the downlink DCI format. The DCI format used for scheduling the PUSCH is also referred to as the uplink DCI format. The downlink grant is also referred to as the downlink assignment (DL assignment) or downlink allocation (DL allocation).

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

DCI format 0_0 is used for scheduling a PUSCH allocated to a certain cell, and is configured to include at least some or all of DCI format 1A to 1E.
1A) Identifier for DCI formats field
1B) Frequency domain resource assignment field
1C) Time domain resource assignment field
1D) Frequency hopping flag field
1E) MCS field (Modulation and Coding Scheme field)

The DCI format specification field may indicate whether the DCI format including the DCI format specification field is an uplink DCI format or a downlink DCI format. That is, the DCI format specification field may be included in both the uplink DCI format and the downlink DCI format. Here, DCI format 0_0
The DCI format specific field included in may indicate 0.

The frequency domain resource allocation field included in DCI format 0_0 may be used to indicate the allocation of frequency resources for the PUSCH scheduled by DCI format 0_0.

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

The frequency hopping flag field may be used to indicate whether frequency hopping is applied to the PUSCH scheduled by the DCI format 0_0.

The MCS field included in DCI format 0_0 may be used to indicate one or both of a modulation scheme for a PUSCH scheduled by DCI format 0_0 and a target coding rate scheduled by DCI format 0_1. The target coding rate may be a target coding rate for a transport block assigned to the PUSCH. The size of the transport block (TBS) assigned to the PUSCH may be determined based on part or all of the target coding rate and the modulation scheme for the PUSCH.

DCI format 0_0 may not include fields used for CSI requests. DCI format 0_0 may not include the carrier indicator field. DCI format 0_0 may not include the BWP field.

DCI format 0_1 is used for scheduling a PUSCH allocated to a certain cell. DCI format 0_1 includes some or all of fields 2A to 2H.
2A) DCI Format Specific Fields
2B) Frequency Domain Resource Allocation Field
2C) Time Domain Resource Allocation Field
2D) Frequency Hopping Flag Field
2E) MCS Field
2F) CSI request field
2G) BWP field
2H) UL DAI field (downlink assignment index)

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

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

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

The MCS field included in DCI format 0_1 may be used to indicate one or both of the modulation scheme for the PUSCH scheduled by DCI format 0_1 and the target coding rate for the PUSCH scheduled by DCI format 0_1.

The CSI request field may be used to indicate the reporting of CSI.

The BWP field of the DCI format 0_1 may be used to indicate the uplink BWP in which the PUSCH scheduled by the DCI format 0_1 is arranged.
Format 0_1 may or may not involve a change of the active uplink BWP. The terminal device 1 may recognize the uplink BWP in which the PUSCH is arranged based on detecting DCI format 0_1 used for scheduling the PUSCH.

DCI format 0_1 that does not include a BWP field may be a DCI format that schedules a PUSCH without changing the active uplink BWP. Based on detecting DCI format 0_1 that is used for scheduling a PUSCH and does not include a BWP field, the terminal device 1 may recognize that the PUSCH will be transmitted without switching the active uplink BWP.

DCI format 0_1 includes a BWP field, but terminal device 1 does not use DCI format 0_1
If the terminal device 1 does not support the BWP switching function, the BWP field may be ignored by the terminal device 1. That is, a terminal device 1 that does not support the BWP switching function may recognize that it will transmit the PUSCH without switching the active uplink BWP based on detecting DCI format 0_1 that is used for PUSCH scheduling and includes the BWP field. Here, if the BWP switching function is supported, the radio resource control layer processing unit 16 may include function information indicating that the BWP switching function is supported in the RRC message.

When DCI format 0_1 includes a carrier indicator field, the carrier indicator field may be used to indicate the serving cell of the uplink component carrier on which the PUSCH is arranged. Based on detecting DCI format 0_1 in the downlink component carrier of a serving cell, the terminal device 1 may recognize that the PUSCH scheduled by the DCI format 0_1 is arranged on the uplink component carrier of the serving cell indicated by the carrier indicator field included in the DCI format 0_1.

If DCI format 0_1 does not include a carrier indicator field, the serving cell to which the uplink component carrier on which the PUSCH scheduled by DCI format 0_1 is allocated may be the same as the serving cell of the downlink component carrier on which the PDCCH including the DCI format 0_1 is allocated. Based on detecting DCI format 0_1 on a downlink component carrier of a serving cell, the terminal device 1 may recognize that the PUSCH scheduled by the DCI format 0_1 is allocated on the uplink component carrier of the serving cell.

The UL DAI field is used at least to indicate the transmission status of the PDSCH. If a dynamic HARQ-ACK codebook is used, the size of the UL DAI field may be 2 bits. The UL DAI field indicates the size of the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of PDSCHs and SPS releases in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH.

The UL DAI field may indicate a value to which a modulo operation has been applied. An example in which the UL DAI field is 2 bits will be described. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 0, the UL DAI field indicates "00". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 1, the UL DAI field indicates "01". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 2, the UL DAI field indicates "10". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 3, the UL DAI field indicates "11". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is four, the UL DAI field indicates "00". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is five, the UL DAI field indicates "01". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is six, the UL DAI field indicates "10". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is seven, the UL DAI field indicates "11". In this example, a modulo operation using the value '4' is performed on the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH.

The terminal device 1 interprets the UL DAI field taking into account the total number of received PDSCHs. For example, the terminal device 1 receives four PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted on the PUSCH indicated by the UL DAI field is four. For example, the terminal device 1 receives three PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted on the PUSCH indicated by the UL DAI field is four, and determines that reception of one PDSCH has been missed.

DCI format 1_0 is used for scheduling a PDSCH allocated to a certain cell, and is configured by including some or all of 3A to 3F.
3A) DCI Format Specific Fields
3B) Frequency Domain Resource Allocation Field
3C) Time Domain Resource Allocation Field
3D) MCS field
3E) PDSCH to HARQ feedback timing indicator field
3F) PUCCH resource indicator field

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

The frequency domain resource allocation field included in DCI format 1_0 may be used to indicate the allocation of frequency resources for the PDSCH scheduled by that DCI format.

The time domain resource allocation field included in DCI format 1_0 may be used to indicate the allocation of time resources for the PDSCH scheduled by that DCI format.

The MCS field included in DCI format 1_0 may be used to indicate one or both of a modulation scheme for a PDSCH scheduled by the DCI format and a target coding rate for the PDSCH scheduled by the DCI format. The target coding rate may be a target coding rate for a transport block allocated to the PDSCH. The size of the transport block (TBS) allocated to the PDSCH may be determined based on one or both of the target coding rate and the modulation scheme for the PDSCH.

The PDSCH_HARQ feedback timing indication field may be used to indicate an offset from the slot containing the last OFDM symbol of the PDSCH to the slot containing the first OFDM symbol of the PUCCH. The PDSCH to HARQ feedback timing indication field may be a field indicating timing K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the PUCCH or PUSCH containing at least a HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH containing at least a HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1.

The PDSCH_HARQ feedback timing indication field may also be referred to as a PDSCH-to-HARQ feedback timing indicator field or a HARQ indication field.

The PUCCH resource indication field may be used to indicate the PUCCH resource.

DCI format 1_0 may not include a carrier indicator field. That is, a downlink component carrier on which a PDSCH scheduled by DCI format 1_0 is arranged may be the same as a downlink component carrier on which a PDCCH including DCI format 1_0 is arranged. By detecting DCI format 1_0 in a certain downlink component carrier, the terminal device 1 may recognize that a PDSCH scheduled by DCI format 1_0 is to be arranged on the downlink component carrier.

DCI format 1_0 may not include a BWP field. Here, DCI format 1_0 may be a DCI format for scheduling a PDSCH without changing the active downlink BWP. By detecting DCI format 1_0 used for scheduling a PDSCH, the terminal device 1 may recognize that it will receive the PDSCH without switching the active downlink BWP.

DCI format 1_1 is used for scheduling a PDSCH allocated to a certain cell, and is configured to include some or all of 4A to 4I.
4A) DCI Format Specific Fields
4B) Frequency domain resource allocation field
4C) Time Domain Resource Allocation Field
4E) MCS Field
4F) PDSCH_HARQ Feedback Timing Indication Field
4G) PUCCH resource indication field
4H) BWP Field
4I) Carrier Indicator Field

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

The frequency domain resource allocation field included in DCI format 1_1 may be used to indicate the allocation of frequency resources for the PDSCH scheduled by DCI format 1_1.

The time domain resource allocation field included in DCI format 1_1 may be used to indicate the allocation of time resources for the PDSCH scheduled by DCI format 1_1.

The MCS field included in DCI format 1_1 may be used to indicate one or both of the modulation scheme for the PDSCH scheduled by DCI format 1_1 and the target coding rate for the PDSCH scheduled by DCI format 1_1.

If DCI format 1_1 includes a PDSCH_HARQ feedback timing indication field, the PDSCH_HARQ feedback timing indication field may be used to indicate an offset from the slot including the last OFDM symbol of the PDSCH to the slot including the first OFDM symbol of the PUCCH. If DCI format 1_1 does not include a PDSCH_HARQ feedback timing indication field, a parameter indicating the offset from the slot including the last OFDM symbol of the PDSCH to the slot including the first OFDM symbol of the PUCCH may be provided by the RRC layer.

The PUCCH resource indication field may be used to indicate the PUCCH resource.

The BWP field of DCI format 1_1 may be used to indicate the downlink BWP in which the PDSCH scheduled by the DCI format 1_1 is arranged.
Format 1_1 may or may not involve a change of the active downlink BWP. The terminal device 1 may recognize the downlink BWP in which the PDSCH is arranged based on detecting DCI format 1_1 used for scheduling the PDSCH.

DCI format 1_1 that does not include a BWP field may be a DCI format that schedules a PDSCH without changing the active downlink BWP. Based on detecting DCI format 1_1 that is used for scheduling a PDSCH and does not include a BWP field, terminal device 1 may recognize that it will receive the PDSCH without switching the active downlink BWP.

DCI format 1_1 includes a BWP field, but terminal device 1 does not use DCI format 1_1
If the terminal device 1 does not support the BWP switching function, the BWP field may be ignored by the terminal device 1. In other words, the terminal device 1 that does not support the BWP switching function may
Based on detecting DCI format 1_1 that is used for scheduling and includes a BWP field, the radio resource control layer processing unit 16 may recognize that the PDSCH will be received without switching the active downlink BWP. Here, if the BWP switching function is supported, the radio resource control layer processing unit 16 may include, in the RRC message, capability information indicating that the BWP switching function is supported.

When DCI format 1_1 includes a carrier indicator field, the carrier indicator field may be used to indicate the serving cell of the downlink component carrier on which the PDSCH scheduled by DCI format 1_1 is arranged. Based on detecting DCI format 1_1 on the downlink component carrier of a serving cell, terminal device 1 may recognize that the PDSCH scheduled by DCI format 1_1 is arranged on the downlink component carrier of the serving cell indicated by the carrier indicator field included in DCI format 1_1.

If DCI format 1_1 does not include a carrier indicator field, the downlink component carrier on which the PDSCH scheduled by DCI format 1_1 is allocated may be the same as the downlink component carrier on which the PDCCH including DCI format 1_1 is allocated. Based on detecting DCI format 1_1 in a certain downlink component carrier, the terminal device 1 may recognize that the PDSCH scheduled by DCI format 1_1 is allocated to the downlink component carrier.

A downlink grant is used for scheduling at least one PDSCH in one serving cell. The downlink grant is used for scheduling at least one PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling a PDSCH in a slot different from the slot in which the downlink grant is transmitted. The uplink grant is used for scheduling at least one PUSCH in one serving cell.

Note that various DCI formats may further include fields different from the above-mentioned fields. They may include a field indicating the cumulative number of transmitted PDCCHs (C-DAI: Counter Downlink Assignment Index field) or a field indicating the total number of transmitted PDCCHs (T-DAI: Total Downlink Assignment Index field).

The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block. The transport block may be allocated to the PDSCH. The base station device 3 may transmit a PDSCH in which a transport block is allocated. The terminal device 1 may receive a PDSCH in which a transport block is allocated.

The downlink physical signal may correspond to a set of resource elements. The downlink physical signal does not have to be used to transmit information generated in a higher layer. The downlink physical signal may be used to transmit information generated in a physical layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The radio transceiver unit 10 may receive the downlink physical signal. The radio transceiver unit 30 may transmit the downlink physical signal. In the downlink of the wireless communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical signals may be used.
・Synchronization signal (SS)
・DL DMRS (DownLink DeModulation Reference Signal)
・CSI-RS (Channel State Information-Reference Signal)
・DL PTRS (DownLink Phase Tracking Reference Signal)

The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and/or the time domain of the downlink. The synchronization signal is a general term for a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

An SS block (SS/PBCH block) is composed of at least a PSS, an SSS, and some or all of the PBCH.

The antenna ports for PSS, SSS, PBCH, and DMRS for PBCH may be the same.

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

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

The set of antenna ports for DMRS for a PDSCH (DMRS related to a PDSCH, DMRS included in a PDSCH, and DMRS corresponding to a PDSCH) may be determined based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

A propagation path of a PDSCH may be estimated from a DMRS for the PDSCH. If a set of resource elements carrying a certain PDSCH symbol and a set of resource elements carrying a DMRS symbol for the PDSCH are included in the same precoding resource group (PRG), the PDSCH carrying the PDSCH symbol for a certain antenna port may be estimated by the DMRS for the PDSCH.

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

The propagation path of a PDCCH may be estimated from the DMRS for the PDCCH. If the same precoder is applied (or assumed to be applied) to a set of resource elements on which a certain PDCCH symbol is transmitted and a set of resource elements on which a DMRS symbol for the PDCCH is transmitted, the PDCCH on which the PDCCH symbol for a certain antenna port is transmitted may be estimated by the DMRS for the PDCCH.

BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel), and DL-SCH (Downlink-Shared CHannel) are transport channels.

The BCH of the transport layer may be mapped to the PBCH of the physical layer, i.e., the transport block delivered from higher layers on the BCH of the transport layer may be placed on the PBCH of the physical layer, and the UL-SCH of the transport layer may be mapped to the PUSCH of the physical layer.

The transport layer applies Hybrid Automatic Repeat Request (HARQ) to the transport block.
t reQuest) may be applied.

The BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH may be used to deliver RRC messages including MIBs or RRC messages including system information. The CCCH may also be used to transmit RRC messages including RRC parameters common to multiple terminal devices 1. Here, the CCCH may be used, for example, for terminal devices 1 that are not RRC connected. The DCCH may also be used to transmit RRC messages dedicated to a certain terminal device 1. Here, the DCCH may be used, for example, for terminal devices 1 that are RRC connected.

The BCCH may be mapped to the BCH or DL-SCH. That is, an RRC message containing MIB information may be delivered on the BCH. An RRC message containing system information other than MIB information may be delivered on the DL-SCH. The CCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the CCCH may be delivered on the DL-SCH or UL-SCH. The DCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the DCCH may be delivered on the DL-SCH or UL-SCH.

The UL-SCH may be mapped to the PUSCH. The DL-SCH may be mapped to the PDSCH. BCH
may be mapped to the PBCH.

The medium access control layer processing unit 15 may also perform a random access procedure.

For example, downlink control information including a downlink grant or an uplink grant is transmitted and received on the PDCCH, including a C-RNTI (Cell-Radio Network Temporary Identifier).

One physical channel may be mapped to one serving cell, and one physical channel may be mapped to one BWP configured on one carrier included in one serving cell.

One or more control resource sets (CORESET: Control Resource SET) may be configured in the terminal device 1. The terminal device 1 may transmit a PDCCH in one or more control resource sets.
Here, monitoring a PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and/or sets of PDCCH candidates. Furthermore, monitoring the PDCCH may include monitoring and detecting the PDCCH and/or a DCI format transmitted via the PDCCH.

Multiple control resource sets may be configured in the terminal device 1, and each control resource set may be assigned an index (control resource set index). One or more control channel elements (CCEs) may be configured within a control resource set, and each CCE may be assigned an index (CCE index).

The set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space.
The set of candidates is given by the search space.

The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidates may indicate the number of CCEs constituting the PDCCH. The PDCCH candidates may be mapped to one or more CCEs.

A search area set may be configured to include at least one or more search areas. Each search area may be assigned an index (search area index).

Each search space set may be associated with at least one control resource set. Each search space set may be included in one control resource set. Each search space set may be given an index of the control resource set associated with that search space set.

The terminal device 1 can detect the PDCCH and/or DCI for the terminal device 1 by blindly detecting PDCCH candidates included in the search space within the control resource set.

In various aspects of this embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto a PUCCH and transmit the same. The terminal device 1 may multiplex the UCI onto a PUSCH and transmit the same. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

HARQ-ACK may also be referred to as ACK/NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information.

If downlink data is successfully decoded, an ACK for the downlink data is generated. If downlink data is not successfully decoded, a NACK for the downlink data is generated. The HARQ-ACK may include at least a HARQ-ACK bit corresponding to at least one transport block. The HARQ-ACK bit may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or multiple transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook including one or multiple HARQ-ACK bits. The HARQ-ACK bit corresponding to one or multiple transport blocks may correspond to a PDSCH including the one or multiple transport blocks.

HARQ control for one transport block may be referred to as an HARQ process. One HARQ process identifier may be assigned to each HARQ process. The DCI format includes a field indicating the HARQ process identifier (HARQ process number).

The NDI (New Data Indicator) is indicated in the DCI format for each HARQ process. For example, the NDI field is included in the DCI format (DL assignment) that includes PDSCH scheduling information. The NDI field is 1 bit. The terminal device 1 stores (stores) the NDI value for each HARQ process. The base station device 3 stores (stores) the NDI value for each HARQ process for each terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format. The base station device 3 sets the updated NDI value or the NDI value that is not updated in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format for the HARQ process corresponding to the value of the HARQ process identifier field of the detected DCI format.

The terminal device 1 determines whether a received transport block is a new transmission or a retransmission based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is toggled, determines that the received transport block is a new transmission. When transmitting a transport block for a new transmission in a certain HARQ process, the base station device 3 toggles the NDI value stored for the HARQ process and transmits the toggled NDI to the terminal device 1. When transmitting a transport block for a retransmission in a certain HARQ process, the base station device 3 does not toggle the NDI value stored for the HARQ process and transmits an untoggled NDI to the terminal device 1. The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is not toggled (they are the same), determines that the received transport block is a retransmission. Note that toggling here means switching to a different value.

The terminal device 1 may report HARQ-ACK information to the base station device 3 using a HARQ-ACK codebook in a slot indicated by the value of the HARQ indication field included in DCI format 1_0 corresponding to PDSCH reception or DCI format 1_1.

For DCI format 1_0, the value of the HARQ indication field may be mapped to a set of slot numbers (1, 2, 3, 4, 5, 6, 7, 8). For DCI format 1_1, the value of the HARQ indication field may be mapped to a set of slot numbers given by the higher layer parameter dl-DataToUL-ACK. The number of slots indicated based at least on the value of the HARQ indication field may also be referred to as HARQ-ACK timing or K1. For example, a HARQ-ACK indicating the decoding status of PDSCH (downlink data) transmitted in slot n may be reported (transmitted) in slot n+K1.

dl-DataToUL-ACK indicates a list of timings of HARQ-ACK for PDSCH. The timing is the number of slots between the slot in which PDSCH is received (or the slot containing the last OFDM symbol to which PDSCH is mapped) and the slot in which HARQ-ACK for the received PDSCH is transmitted. For example, dl-DataToUL-ACK can be 1, 2, or 3.
The HARQ indication field is a list of 1, 4, 5, 6, 7, or 8 timings. If the DL-DataToUL-ACK is a list of 1 timing, the HARQ indication field is 0 bit. If the DL-DataToUL-ACK is a list of 2 timings, the HARQ indication field is 1 bit. If the DL-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indication field is 2 bits. If the DL-DataToUL-ACK is a list of 5, 6, 7, or 8 timings, the HARQ indication field is 3 bits. For example, the DL-DataToUL-ACK consists of a list of timings with a value ranging from 0 to 31. For example, the DL-DataToUL-ACK consists of a list of timings with a value ranging from 0 to 63.

The size of the dl-DataToUL-ACK is defined as the number of elements included in the dl-DataToUL-ACK. The size of the dl-DataToUL-ACK may be referred to as _Lpara . The index of the dl-DataToUL-ACK indicates the order (number) of the elements in the dl-DataToUL-ACK. For example, if the size of the dl-DataToUL-ACK is 8 ( _Lpara = 8), the index of the dl-DataToUL-ACK is 1, 2, 3, 4,
The value is either 5, 6, 7, or 8. The index of DL-DataToUL-ACK is
It may be given, indicated, or indicated by the value indicated by the indication field.

The terminal device 1 may set the size of the HARQ-ACK codebook according to the size of the dl-DataToUL-ACK. For example, if the dl-DataToUL-ACK consists of eight elements, the size of the HARQ-ACK codebook is 8. For example, if the dl-DataToUL-ACK consists of two elements, the size of the HARQ-ACK codebook is 2. Each piece of HARQ-ACK information that makes up the HARQ-ACK codebook is HARQ-ACK information for PDSCH reception at each slot timing of the dl-DataToUL-ACK. This type of HARQ-ACK codebook is also called a semi-static HARQ-ACK codebook.

The terminal device 1 may report HARQ-ACK information for PDSCH reception in slot n using PUCCH transmission and/or PUSCH transmission in slot n+k, where k may be the number of slots indicated by the HARQ indication field included in the DCI format corresponding to the PDSCH reception. Alternatively, if the HARQ indication field is not included in the DCI format, k may be provided by the higher layer parameter dl-DataToUL-ACK.

The terminal device 1 determines a set of multiple opportunities for one or more candidate PDSCH receptions, for transmitting corresponding HARQ-ACK information in the PUCCH of a certain slot. The terminal device 1 determines multiple slots of slot timing K1 included in the dl-DataToUL-ACK as multiple opportunities for candidate PDSCH receptions. K1 may be a set of k. For example, if the dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), the PUCCH of slot n receives the PDSCH in slot n-1, the PDSCH in slot n-2, and the PDSCH in slot n-3.
HARQ-ACK information is transmitted for the PDSCH reception in slot n-1, the PDSCH reception in slot n-2, the PDSCH reception in slot n-3, the PDSCH reception in slot n-4, the PDSCH reception in slot n-5, the PDSCH reception in slot n-6, the PDSCH reception in slot n-7, and the PDSCH reception in slot n-8. When a PDSCH is actually received in a slot corresponding to a candidate PDSCH reception, the terminal device 1 sets ACK or NACK as the HARQ-ACK report based on the transport block included in that PDSCH, and when a PDSCH is not received in a slot corresponding to a candidate PDSCH reception, the terminal device 1 sets NACK as the HARQ-ACK information.

The HARQ-ACK codebook may be determined based on at least some or all of a set of PDCCH monitoring occasions and the value of the Counter DAI field. The HARQ-ACK codebook may be determined based on the value of the UL DAI field. The HARQ-ACK codebook may be determined based on the value of the DAI field. The HARQ-ACK codebook may be determined based on the value of the Total DAI field.

The size of the HARQ-ACK codebook may be set based on the value of the Counter DAI field of the last received DCI format, which indicates the cumulative number of PDSCHs or transport blocks scheduled until reception of the corresponding DCI format. The size of the HARQ-ACK codebook may be set based on the value of the Total DAI field of the DCI format, which indicates the total number of PDSCHs or transport blocks scheduled until transmission of the HARQ-ACK codebook.

The terminal device 1 may determine a set of PDCCH monitoring occasions for HARQ-ACK information transmitted in a PUCCH arranged in a slot of index n (slot #n) based on at least a part or all of the value of the timing K1 and the value of the slot offset K0. The set of PDCCH monitoring occasions for HARQ-ACK information transmitted in a PUCCH arranged in a slot of index n is determined based on the value of the timing K1 and the value of the slot offset K0.
H for slot #n). Here, the set of PDCCH monitoring opportunities includes M PDCCH monitoring opportunities. For example, the slot offset K0 may be indicated based at least on the value of a time domain resource allocation field included in a downlink DCI format. The slot offset K0 is a value indicating the number of slots (slot difference) from the slot including the last OFDM symbol in which a PDCCH including a DCI format including a time domain resource allocation field indicating the slot offset K0 is arranged to the first OFDM symbol of a PDSCH scheduled by the DCI format.

If a DCI format detected in a monitoring opportunity of any search space set corresponding to a monitoring opportunity of a certain PDCCH triggers (includes triggering information) transmission of HARQ-ACK information in slot n, the terminal device 1 may determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n. Also, if a DCI format detected in a monitoring opportunity of a search space set corresponding to a monitoring opportunity of a certain PDCCH does not trigger (does not include triggering information) transmission of HARQ-ACK information in slot n, the terminal device 1 may not determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n. Also, if no DCI format is detected in a monitoring opportunity of a search space set corresponding to a monitoring opportunity of a certain PDCCH, the terminal device 1 may not determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n.

The Counter DAI indicates, for a PDCCH monitoring opportunity in a serving cell among M PDCCH monitoring opportunities, the cumulative number of PDCCH signals detected up to the PDCCH monitoring opportunity in the serving cell (or a value at least related to the cumulative number). The Counter DAI may also be referred to as C-DAI. The C-DAI corresponding to a PDSCH may be indicated by a field included in a DCI format used for scheduling the PDSCH. The Total DAI may indicate the cumulative number of PDCCH signals detected up to PDCCH monitoring opportunity m among M PDCCH monitoring opportunities (or a value at least related to the cumulative number). The Total DAI may also be referred to as T-DAI (Total Downlink Assignment Index).

Settings related to multiple SPSs (multiple SPS configurations) and settings related to multiple search areas (multiple search area configurations) are made for the terminal device 1. The base station device 3 makes settings related to multiple SPSs and multiple search areas for the terminal device 1. Furthermore, settings related to multiple CSI feedbacks (CSI reporting) (multiple CSI feedback (CSI reporting) configurations) are made for the terminal device 1. The base station device 3 makes settings related to multiple CSI feedbacks (CSI reporting) for the terminal device 1. Some settings related to multiple SPSs (a certain SPS configuration) and some settings related to multiple search areas (a certain search area configuration) are associated with each other. Furthermore, some settings related to multiple CSI feedbacks (CSI reporting) (a certain CSI feedback (CSI reporting) configuration) are also associated with each other. A certain SPS configuration, a certain search area configuration, and a certain CSI feedback configuration may be associated with each other as one configuration of XR transmission. An index may be set for each configuration associated with one configuration of XR transmission.

SPS resources with different cycles corresponding to the fluctuations in XR data are set in each SPS configuration. The PDCCH monitoring cycle that matches the SPS cycle is set in each search area configuration. Dynamic scheduling (
In order to reduce battery consumption by halting signal processing in slots where SPS resources are not allocated, the SPS resource period and the PDCCH monitoring period are matched while using dynamic grant scheduling (SPS scheduling). When dynamic scheduling is applied, the CSI feedback period is set in each CSI feedback configuration to match the PDCCH monitoring period so that an appropriate modulation scheme and coding rate can be set.
CSI is calculated in the slot as close as possible to the slot in which dynamic scheduling can be used.
is notified from the terminal device 1 to the base station device 3, and the base station device 3 can use the timely CSI to apply a modulation scheme and coding rate suitable for the terminal device 1 to the PDSCH.

A process for switching the XR transmission configuration (first transmission) in one embodiment of the present invention will be described. FIG. 5 is a diagram showing an example of a process for switching the XR transmission configuration of a terminal device 1 according to one aspect of this embodiment. The radio transceiver unit 10 of the terminal device 1 receives a DCI format including information for switching the XR transmission configuration, and determines whether or not a change in the XR transmission configuration has been instructed by the base station device 3 (step S101). If the radio transceiver unit 10 of the terminal device 1 determines that a change in the XR transmission configuration has been instructed (step S101: YES), it changes the SPS configuration, search space configuration, and CSI feedback configuration. The radio transceiver unit 10 sets the SPS configuration, search space configuration, and CSI feedback configuration associated with the index of the target XR transmission configuration indicated in the DCI format. If the radio transceiver unit 10 of the terminal device 1 determines that a change in the XR transmission configuration has not been instructed (step S101: NO), it does not change the SPS configuration, search space configuration, or CSI feedback configuration. For example, if the index of the XR transmission configuration indicated in the DCI format is the same as the index of the currently set XR transmission configuration, the wireless transceiver unit 10 determines that no change in the XR transmission configuration has been instructed.

FIG. 6 is a diagram showing an example of an XR transmission configuration (XR transmission configuration 1) according to one aspect of the present embodiment. As an SPS configuration (SPS PDSCH configuration 1), SPS PDSCH resources are configured at a cycle of every four slots starting from slot #0. As a search space configuration (search space configuration 1), a search space is configured at a cycle of every four slots starting from slot #0. It is desirable that the slots in which the SPS PDSCH resources are configured and the slots in which the search space are configured are the same or close to each other. The search space here is a UE-specific search space of the PDCCH used for transmitting and receiving a DCI format including PDSCH scheduling information including XR transmission data, and is not a common search space. As a CSI feedback configuration (CSI feedback configuration 1), PUCCH resources for CSI feedback are configured at a cycle of every four slots starting from slot #1. Taking transmission delay time and processing time into consideration, CSI feedback resources are configured from slot #1 to terminal device 1 at a timing suitable for determining a modulation scheme for PDSCH (PDSCH using dynamic scheduling).

7 is a diagram showing an example of an XR transmission configuration (XR transmission configuration 2) according to one aspect of the present embodiment. As an SPS configuration (SPS PDSCH configuration 2), SPS PDSCH resources are configured at a cycle of every 8 slots starting from slot #0. As a search space configuration (search space configuration 1), a search space is configured at a cycle of every 8 slots starting from slot #0. As a CSI feedback configuration (CSI feedback configuration 2), PUCCH resources for CSI feedback are configured at a cycle of every 8 slots starting from slot #1. Taking transmission delay time and processing time into consideration, CSI feedback resources are configured from the base station device 3 to the terminal device 1 at a timing suitable for determining a modulation scheme for the PDSCH (PDSCH using dynamic scheduling).

As shown in Figures 6 and 7, the SPS configuration, search space configuration, and CSI feedback configuration are set as the XR transmission configuration. Terminal device 1 receives a DCI format including information indicating the XR transmission configuration, and switches the XR transmission configuration. Base station device 3 transmits a DCI format including information indicating the XR transmission configuration to terminal device 1, and switches the XR transmission configuration.

As explained above, resources can be used efficiently between the terminal device 1 and the base station device 3. Necessary scheduling and efficient adaptive modulation are achieved in response to fluctuations in transmission data for augmented reality and cloud gaming, reducing battery consumption in the terminal device 1. By previously associating the SPS configuration, search area configuration, and CSI feedback configuration as XR transmission configurations and including information indicating the XR transmission configuration in the DCI format, it is possible to reduce the increase in size of the DCI format compared to when information indicating the SPS configuration, information indicating the search area configuration, and information indicating the CSI feedback configuration are each included in the DCI format.

The programs that run on the base station device 3 and terminal device 1 according to the present invention may be programs that control a CPU (Central Processing Unit) or the like (programs that make a computer function) so as to realize the functions of the above-described embodiments according to the present invention. Information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) or HDD (Hard Disk Drive).
The data is stored in the , and is read, modified, and written by the CPU as needed.

In addition, parts of the terminal device 1 and base station device 3 in the above-described embodiments may be implemented by a computer. In this case, the program for implementing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to implement the function.

Note that the term "computer system" used here refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as the OS and peripheral devices. Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into the computer system.

Furthermore, "computer-readable recording medium" may include something that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or something that stores a program for a fixed period of time, such as volatile memory within a computer system that serves as a server or client in such cases. Furthermore, the above program may be one that realizes some of the functions described above, or may be one that can realize the functions described above in combination with a program already stored in the computer system.

The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause the terminal device 1 to perform the operations and processing described in the above embodiments using the processor. The base station device 3 may comprise at least one processor and at least one memory containing computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause the base station device 3 to perform the operations and processing described in the above embodiments using the processor.

Furthermore, the base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 related to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 related to the above-described embodiment can also communicate with the base station device as a collection.

Furthermore, the base station device 3 in the above-described embodiment is a EUTRAN (Evolved Universal Terrestrial Radio Access Network)
The base station device 3 in the above-described embodiment may have some or all of the functions of an upper node for the eNodeB and/or the gNB.

Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiments may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chipset.
Each functional block of the terminal device 1 and the base station device 3 may be individually integrated into a chip, or part or all of them may be integrated into a chip.
Alternatively, it may be realized by a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology, it may also be possible to use an integrated circuit based on that technology.

Furthermore, while the above-described embodiment describes a terminal device as an example of a communications device, the present invention is not limited to this and can also be applied to terminal devices or communications devices such as stationary or non-mobile electronic devices installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning/washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the invention. Furthermore, the present invention is susceptible to various modifications within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included within the technical scope of the present invention. Furthermore, configurations in which elements described in the above embodiments are substituted for elements that achieve similar effects are also included.

1 (1A, 1B, 1C) Terminal device 3 (3A, 3B, 3C) Base station device 10, 30 Radio transmission/reception unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims (3)

A terminal device comprising a processor and a memory for storing computer program code,
an SPS configuration , a search space configuration , and a CSI feedback configuration are set in association with each other as an XR transmission configuration , and the terminal device receives a DCI format including information indicating the XR transmission configuration ;
Search regions with different periods are set for the configurations of the plurality of SPSs in accordance with the periods of the SPSs ,
CSI feedback having different periods aligned with the period of the SPS is set for each of the plurality of CSI feedback configurations.
Terminal device. A communication method used in a terminal device, comprising:
receiving a DCI format in which an SPS configuration , a search space configuration , and a CSI feedback configuration are set in association with each other as an XR transmission configuration , and the DCI format includes information indicating the XR transmission configuration ;
Including,
Search regions with different periods are set for the configurations of the plurality of SPSs in accordance with the periods of the SPSs ,
CSI feedback having different periods aligned with the period of the SPS is set for each of the plurality of CSI feedback configurations.
Communication method. A base station device comprising a processor and a memory for storing computer program code,
performing an operation including: setting an SPS configuration , a search space configuration, and a CSI feedback configuration in association with each other as an XR reception configuration ; and transmitting a DCI format including information indicating the XR reception configuration to a terminal device ;
Set search regions with different periods corresponding to the periods of the SPSs for the configurations of the SPSs;
setting CSI feedback with different periods corresponding to the periods of the SPS for each of the plurality of CSI feedback configurations;
Base station equipment.