WO2024232364A1 - Terminal device and communication method - Google Patents

Abstract

According to the present invention, RRC signaling including information indicating a delay time limit of sidelink beam-related information reporting is received, a value indicated by the information indicating the delay time limit of sidelink beam-related information reporting is set in a timer, the timer is started when sidelink beam-related information reporting is triggered, the timer is stopped when a signal including the sidelink beam-related information is transmitted during clocking of the timer, and the triggered sidelink beam-related information reporting is cancelled when the timer expires.

Description

Terminal device and communication method

The present invention relates to a terminal device and a communication method.
This application claims priority to Japanese Patent Application No. 2023-076976, filed on May 9, 2023, the contents of which are incorporated herein by reference.

A 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") is being studied by the 3rd Generation Partnership Project (3GPP: 3rd Generation Partnership Project). In LTE, base station equipment is also called eNodeB (evolved NodeB), and terminal equipment is also called UE (User Equipment). LTE is a cellular communication system in which the areas covered by base station equipment are arranged in multiple cell-like configurations. A single base station equipment 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 for three scenarios within a single technology framework: eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication).

NR supports sidelink technology, which allows terminal devices to communicate directly with each other without going through a base station. In addition, improvements are being considered for the high-frequency band FR2 (Frequency Range 2) (Non-Patent Document 1).

"WID revision: NR sidelink evolution", RP-230077, OPPO, 3GPPTSG RAN Meeting #99, March 20-23, 2023

In order to improve sidelink operations in FR2, support for beam management is being considered. Support for initial beam pairing, beam maintenance, beam failure recovery, etc. is being considered. One aspect of the present invention provides a terminal device capable of efficiently supporting beam management in the sidelink, and a communication method used in the terminal device.

(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 receiving RRC signaling including information indicating a delay time limit for sidelink beam related information reporting, setting a timer to a value indicated by the information indicating the delay time limit for the sidelink beam related information reporting, starting the timer when the sidelink beam related information reporting is triggered, stopping the timer when a signal including sidelink beam related information is transmitted while the timer is timing, and canceling the triggered sidelink beam related information reporting when the timer expires.

(2) Further, when the sidelink beam-related information reporting is triggered, an operation including transmitting a scheduling request to the base station device using a scheduling request configuration for the sidelink beam-related information reporting is performed.

(3) Furthermore, the sidelink beam-related information is at least one of a beam instruction, an L1-RSRP, and an L1-SINR.

(4) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of receiving RRC signaling including information indicating a delay time limit for sidelink beam-related information reporting, setting a timer to a value indicated by the information indicating the delay time limit for the sidelink beam-related information reporting, starting the timer when the sidelink beam-related information reporting is triggered, stopping the timer when a signal including sidelink beam-related information is transmitted while the timer is timing, and canceling the triggered sidelink beam-related information reporting when the timer expires.

(5) Further, when the sidelink beam-related information reporting is triggered, the method includes a step of transmitting a scheduling request to the base station device using a scheduling request configuration for the sidelink beam-related information reporting.

(6) Furthermore, the sidelink beam-related information is at least one of a beam instruction, an L1-RSRP, and an L1-SINR.

According to one aspect of the present invention, beam management can be efficiently supported in the side link.

1 is a conceptual diagram of a wireless communication system according to an embodiment of the present invention. 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 a configuration of a terminal device 1 according to an aspect of the present embodiment. 1 is a schematic block diagram showing a configuration of a base station device 3 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 at least includes 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 this embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3 (gNB). Hereinafter, terminal devices 1A to 1D are also referred to as terminal device 1 (UE).

The base station device 3 may be configured to include one or both of an MCG (Master Cell Group) and an SCG (Secondary Cell Group). The MCG is a group of serving cells including at least a PCell (Primary Cell). The SCG is a group of serving cells including 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 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 a serving cell. The serving cell identity may be provided by an upper layer parameter.

Serving cell group (cell group) is a general term for MCG, SCG, and 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 called 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. The terminal device 1 is added with a frequency band used for communication. The terminal device 1 is added with a cell (serving cell) used for communication. The terminal device 1 is added with a connection to the base station device 3.

Terminal device 1A and terminal device 1B communicate directly using side link technology. Terminal device 1A and terminal device 1B are located within the coverage of base station device 3 (in-coverage). Terminal device 1A and terminal device 1C communicate directly using side link technology. Terminal device 1C and terminal device 1D communicate directly using side link technology. Terminal device 1C and terminal device 1D are located outside the coverage of base station device 3 (out-of-coverage). There are three cases: direct communication between in-coverage terminal devices 1, direct communication between in-coverage terminal device 1 and out-of-coverage terminal device 1, and direct communication between out-of-coverage terminal devices 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 Multiplex) may be used in the downlink of the wireless communication system. Also, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplex) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which transform precoding is applied prior to signal generation in CP-OFDM. Here, transformed precoding is also referred to as DFT precoding.

CP-OFDM may be used for the side link between terminal device 1 and terminal device 1. Also, DFT-s-OFDM may be used for the side link between terminal device 1 and terminal device 1.

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

The subcarrier spacing (SCS) Δf for a certain subcarrier spacing setting μ may be Δf=2 ^μ ×15 kHz. For example, the subcarrier spacing setting μ may represent any of 0, 1, 2, 3, or 4.

A time unit _Tc = 1/( _Δfmax × _Nf ) may be used to express the length of the time domain, where _Δfmax = 480 kHz, and _Nf = 4096. The constant κ may be κ = _Δfmax × _Nf / ( _{Δfref Nf,ref} ) = 64, where _Δfref may be 15 kHz, and _Nf,ref is 2048.

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

The transmission of sidelink signals may be organized in radio frames (system frames, frames) of length Tf, where Tf = (Δfmax × Nf/100) × Ts = 10 ms.

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

The OFDM symbol is used as the unit of time domain for the communication method used in the wireless communication system. For example, the OFDM symbol may be used as the unit of time domain for CP-OFDM. The OFDM symbol may also be used as the unit of time domain 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. Also, 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 the subframe. Also, the slot index nμs,f may be given in ascending order as integer values ranging from 0 to Nframe,μslot-1 in the radio frame.

FIG. 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 FIG. 2, the horizontal axis is the OFDM symbol index lsym, and the vertical axis is the subcarrier index ksc. The resource grid of FIG. 2 includes Nsize, μgrid, x × NRBsc subcarriers, and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, x indicate the bandwidth of the SCS-specific carrier. The values of Nsize, μgrid, x are expressed in units of resource blocks.

Within the resource grid, a resource identified by the subcarrier index ksc and the OFDM symbol index lsym is also called a resource element (RE: ResourceElement).

A resource block (RB) contains NRBsc consecutive subcarriers. Resource block is a general term for common resource block, physical resource block (PRB), and virtual resource block (VRB). For example, NRBsc=12.

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

The BWP set for a sidelink is also called a sidelink BWP.

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

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

FIG. 3 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of this 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 transmitting unit, a receiving unit, 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 placed on the uplink physical channel. For example, the radio transceiver 10 may generate a baseband signal of an uplink physical signal.

For example, the wireless transceiver 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 DL-SCH. For example, the wireless transceiver 10 may attempt to detect information transmitted by a downlink physical signal.

For example, the wireless transceiver unit 10 may generate a baseband signal of a sidelink physical channel. For example, the wireless transceiver unit 10 may generate a baseband signal of a sidelink physical signal. For example, the wireless transceiver unit 10 may attempt to detect information transmitted by the sidelink physical channel. For example, the wireless transceiver unit 10 may attempt to detect information transmitted by the sidelink 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 receiving processing unit of the terminal device 1 performs processing to receive the PDCCH and performs processing to detect downlink control information.

The receiving unit of the terminal device 1 receives the PDSCH. The 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.

The receiving unit of the terminal device 1 receives the PSCCH. The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PSCCH. The receiving processing unit of the terminal device 1 performs processing to receive the PSCCH and to detect side link control information. The receiving unit of the terminal device 1 determines the frequency resource constituting the PSCCH. The receiving unit of the terminal device 1 determines the OFDM symbol in which the PSCCH may be placed. The receiving unit of the terminal device 1 blind decodes the PSCCH. The receiving unit of the terminal device 1 blind decodes the PSCCH in one slot in one resource pool. The receiving unit of the terminal device 1 receives the PSSCH. The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PSSCH. The receiving unit of the terminal device 1 receives the PSFCH. The receiving processing unit of the terminal device 1 receives the HARQ-ACK on the PSFCH.

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

The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for the PSSCH. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK in the sidelink frequency band. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK on the PSFCH. The transmission processing unit of the terminal device 1 may transmit a HARQ-ACK on the PSSCH. The transmission processing unit of the terminal device 1 may not transmit a HARQ-ACK for the PSSCH.

The transmission processing unit of the terminal device 1 transmits the PSCCH. The transmission processing unit of the terminal device 1 performs processing such as encoding and modulation on the PSCCH. The transmission processing unit of the terminal device 1 performs processing to transmit side link control information ( ^1st stage SCI) using the PSCCH. The transmission unit of the terminal device 1 determines frequency resources constituting the PSCCH. The transmission processing unit of the terminal device 1 determines an OFDM symbol in which the PSCCH can be placed. The transmission processing unit of the terminal device 1 transmits the PSSCH. The transmission processing unit of the terminal device 1 performs processing such as encoding and modulation on the PSSCH. The transmission processing unit of the terminal device 1 performs processing to transmit side link control information ( ^2nd stage SCI) using the PSSCH. Information such as MAC CE is transmitted using the PSSCH.

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

The upper layer processing unit 14 outputs the side link data (transport block) to the radio transceiver unit 10.

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 manages various setting information/parameters (RRC parameters) of its own device. The radio resource control layer processing unit 16 sets various setting information/parameters (RRC parameters) based on upper 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 upper layer parameters.

For example, the radio resource control layer processing unit 16 may acquire RRC parameters contained in an RRC message on a certain logical channel, and set the acquired RRC parameters in a memory area of the terminal device 1. The RRC parameters set in the memory 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 the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets (configures) a search area 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) the aggregation level of the PDCCH candidates to be monitored within the control resource set.

The radio resource control layer processing unit 16 sets the DCI format to be monitored within the control resource set. The radio resource control layer processing unit 16 may set the DCI format to be monitored within the search area. The radio resource control layer processing unit 16 sets the DCI format to be monitored within the control resource set based on the RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 may set the DCI format to be monitored within the search area based on the 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 related to multiple search areas. Each setting related to the 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 the 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, and the like. 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 sets the period of the SPS resources (PDSCH resources), the start timing (offset) of the SPS resources (PDSCH resources), the number of HARQ processes set for the SPS, the offset used to derive the HARQ process ID used for the SPS, the RNTI value for scheduling the SPS, and the like. The radio resource control layer processing unit 16 performs settings related to multiple SPS. The settings related to multiple SPS are each indexed.

The radio resource control layer processing unit 16 configures carrier aggregation based on the 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 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 transmission/reception unit 10 to perform reception processing with the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 16 controls the radio transmission/reception unit 10 to perform transmission processing with the uplink component carrier configured in the carrier aggregation configuration.

The radio resource control layer processing unit 16 performs settings related to the side link based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets parameters related to the side link notified from the base station device 3. The parameters related to the side link will be described later. For example, the radio resource control layer processing unit 16 sets an OFDM symbol in which the PSCCH can be placed. For example, the radio resource control layer processing unit 16 sets a band in which the PSCCH can be placed. For example, the radio resource control layer processing unit 16 sets the number of resource blocks constituting one PSCCH. The radio resource control layer processing unit 16 performs settings related to the transmission and reception of the PSCCH for the radio transmission and reception unit 10. For example, the radio resource control layer processing unit 16 sets a slot in which the PSFCH can be transmitted. For example, a slot in which the PSFCH can be transmitted is set every four slots.

The radio resource control layer processing unit 16 sets one or more destination identities for unicast and groupcast communication destinations. Groupcast is communication between multiple terminal devices 1, and multiple destination identities are set.

The medium access control layer processing unit (MAC layer processing unit) 15 activates/deactivates the secondary cell based on the MAC CE (MAC Control Element) received from the base station device 3. 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 the 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 a certain period of time by the base station device 3 for the serving cell by measuring with a timer, and deactivates the serving cell and controls the radio transceiver unit 10.

The medium access control layer processor (MAC layer processor) 15 processes sidelink HARQ operations, sidelink scheduling requests, sidelink buffer status reports, sidelink CSI reports, and sidelink beam-related information reports. The sidelink CSI is a channel quality indicator CQI and a rank indicator RI. For example, the sidelink beam-related information is information consisting of one or more of a beam indication, L1-RSRP (reference signal received power), and L1-SINR (signal-to-noise and interference ratio). The beam indication may be an index CRI (CSI-RS Indicator) indicating the CSI-RS. The L1-RSRP is, for example, a CSI-RS-based RSRP (CSI-RSRP), which is a linear average over the power contributions of multiple resource elements carrying the CSI-RS. L1-SINR is, for example, a CSI-RS based SINR (CSI-SINR), which is a linear average over the power contributions of multiple resource elements carrying CSI-RS divided by the linear average of the power contributions of noise and interference. The interference and noise may be measured on resources indicated by higher layers. For example, the sidelink beam related information is beam failure information (information indicating that a beam failure has been detected). Beam failure means that the radio quality of the sidelink has deteriorated below a pre-configured threshold. The sidelink radio quality may be radio quality measured based on the DM RS of the PSCCH. The sidelink radio quality may be radio quality measured based on the DM RS of the PSSCH. The sidelink radio quality may be radio quality measured based on the sidelink CSI-RS. The sidelink beam related information may be exchanged in a MAC CE (Sidelink BI Reporting MAC CE) (Sidelink BFR MAC CE).

The following describes the processing of CSI reporting in the medium access control layer processing unit (MAC layer processing unit) 15. The medium access control layer processing unit (MAC layer processing unit) 15 sets a timer (sl-CSI-ReportTimer) (second timer) to the value indicated in the information indicating the delay time limit of sidelink CSI reporting. When SL-CSI reporting is triggered by SCI, the medium access control layer processing unit (MAC layer processing unit) 15 starts the sl-CSI-ReportTimer. When the sl-CSI-ReportTimer expires, the medium access control layer processing unit (MAC layer processing unit) 15 cancels the triggered SL-CSI reporting. When the medium access control layer processing unit (MAC layer processing unit) 15 acquires resources for new transmission, it multiplexes a signal including sidelink CSI information onto the resources, stops the sl-CSI-ReportTimer, and cancels the triggered SL-CSI reporting.

The processing of beam-related information reporting in the medium access control layer processing unit (MAC layer processing unit) 15 will be described. The medium access control layer processing unit (MAC layer processing unit) 15 sets the value indicated by the information indicating the delay time limit of the sidelink beam-related information report to a timer (sl-BI-ReportTimer) (first timer). When a sidelink beam-related information report is triggered, the medium access control layer processing unit (MAC layer processing unit) 15 starts the sl-BI-ReportTimer. When the sl-BI-ReportTimer expires, the medium access control layer processing unit (MAC layer processing unit) 15 cancels the triggered sidelink beam-related information report. When the medium access control layer processing unit (MAC layer processing unit) 15 acquires resources for new transmission, it multiplexes a signal including sidelink beam-related information into the resources, stops the sl-BI-ReportTimer, and cancels the triggered sidelink beam-related information report.

The processing of sidelink scheduling requests in the medium access control layer processing unit (MAC layer processing unit) 15 will be described. Sidelink scheduling requests are used to request resources for new transmissions when triggered by sidelink BSR, sidelink CSI report, sidelink beam-related information report, etc. One PUCCH resource is configured for sidelink scheduling requests per uplink BWP. Each sidelink logical channel may be mapped to one scheduling request configuration. Sidelink CSI reports are mapped to one scheduling request configuration. Sidelink beam-related information reports are mapped to one scheduling request configuration. Sidelink CSI reports and sidelink beam-related information reports may be mapped to different scheduling request configurations. The scheduling request configuration is the configuration of PUCCH frequency resources (resource blocks), time resources (slot period, slot offset), etc. used for the scheduling request.

The priority value of a scheduling request triggered by a sidelink CSI report may correspond to the priority value of the Sidelink CSI Reporting MAC CE (Sidelink CSI Reporting MAC CE). The priority value of a scheduling request triggered by a sidelink beam-related information report may correspond to the priority value of the Sidelink Beam-related Information Reporting MAC CE (Sidelink BI Reporting MAC CE) (Sidelink BFR MAC CE).

A pending scheduling request triggered by the sidelink BSR procedure is cancelled when the sidelink BSR MAC CE is sent. A pending scheduling request triggered by the sidelink CSI report is cancelled when the sidelink CSI reporting MAC CE is sent. A pending scheduling request triggered by the sidelink CSI report is also cancelled when the delay time limit of the sidelink CSI report is not met. A pending scheduling request triggered by the sidelink beam-related information report is cancelled when the sidelink BI reporting MAC CE is sent. A pending scheduling request triggered by the sidelink beam-related information report is also cancelled when the delay time limit of the sidelink beam-related information report is not met.

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

The wireless transceiver 10 performs modulation, encoding, and transmission processing. The wireless transceiver 10 generates a physical signal by encoding data (transport block), modulating it, and generating a baseband signal (converting it into a time-continuous signal), and transmits it to the base station device 3 or the terminal device 1.

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

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

The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal (down-converts) 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 the portion corresponding to the CP (Cyclic Prefix) 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 the 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 upconverts the analog signal to a carrier frequency 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 of controlling the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

Below, an example configuration of a base station device 3 according to one aspect of this embodiment is described.

FIG. 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 transmission/reception unit 30 and a higher layer processing unit 34. The radio transmission/reception 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 transmission/reception unit 30 is also referred to as a transmitting unit, a receiving unit, or a physical layer processing unit.

The upper layer processing unit 34 processes the MAC (Medium Access Control) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the 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 provided in the upper layer processing unit 34 performs MAC layer processing. Here, the MAC layer processing may include mapping between logical channels and transport channels, multiplexing one or more MAC SDUs (Service Data Units) into transport blocks, decomposing a transport block delivered from the physical layer on the UL-SCH into one or more MAC SDUs, applying HARQ (Hybrid Automatic Repeat reQuest) to the transport block, and 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. The RRC layer processing may include some or all of the management of broadcast signals, management of RRC connection/RRC idle states, and RRC reconfiguration. The radio resource control layer processing unit 36 generates downlink data (transport blocks), system information, RRC messages, MAC CE, etc. that are placed in the PDSCH, or obtains them from the upper node, 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 higher layer signal. That is, the radio resource control layer processing unit 36 transmits/reports information indicating various setting information/parameters. The setting information may include information related to processing or setting of a physical channel or physical signal (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 36 may include the RRC parameters in an RRC message on a certain logical channel and transmit it to the terminal device 1. Here, the RRC message may be mapped to any one of the BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel).

The radio resource control layer processing unit 36 may determine the 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 functional information report of the terminal device 1.

The radio resource control layer processing unit 36 sets a control resource set for the terminal device 1. Multiple PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 sets a search space for the terminal device 1. The radio resource control layer processing unit 36 sets 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 settings related to multiple search areas. Each setting related to the 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 CSI feedback transmission period, the CSI feedback transmission start timing (offset), the CSI feedback information type, and the like. The radio resource control layer processing unit 36 performs settings related to multiple CSI feedbacks. Each of the settings related to multiple CSI feedbacks is indexed.

The radio resource control layer processing unit 36 performs settings related to SPS 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 set for the SPS, the offset used to derive the HARQ process ID used for the SPS, the RNTI value for scheduling the SPS, and the like. The radio resource control layer processing unit 36 performs settings related to multiple SPS. The settings related to multiple SPS 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 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 transmission/reception 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 transmission/reception unit 30 to perform reception processing for the terminal device 1 using the uplink component carrier configured in the carrier aggregation configuration.

The radio resource control layer processing unit 36 performs settings related to the side link for the terminal device 1. The radio resource control layer processing unit 36 sets parameters related to the side link for the terminal device 1 and notifies the terminal device 1 via the radio transceiver unit 30. For example, the following information is used as the parameters related to the side link.
- Configuring Sidelink BWP - Configuring Sidelink Radio Bearer - Configuring Sidelink Measurements

The information indicating the sidelink BWP configuration includes information indicating the starting position of the symbol in the slot used for the sidelink, the symbol length, the PSBCH configuration, the sidelink resource pool configuration, etc. The information indicating the PSBCH configuration includes information indicating parameters used for PSBCH transmission power control. The information indicating the sidelink resource pool configuration includes information indicating the sidelink receiving resource pool configuration, the sidelink transmitting resource pool configuration, etc. The sidelink transmission resource pool configuration includes the transmission resource pool configuration for the method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1, and the transmission resource pool configuration for the method (mode 2) in which the terminal device 1 autonomously (automatically) selects resources.

The information indicating the sidelink resource pool configuration includes information indicating the PSCCH configuration, information indicating the PSSCH configuration, information indicating the PSFCH configuration, information indicating the sidelink subchannel size, information indicating the start position of the sidelink subchannel, information indicating the MCS table used in the sidelink, information indicating the sidelink PTRS configuration, information indicating the sidelink TDD UL-DL configuration, information indicating the number of PRBs in the sidelink resource pool, information indicating the time resources in the sidelink resource pool, information indicating parameters of the sidelink transmit power control, information indicating the maximum number of reserved PSCCH/PSSCH resources that can be indicated in one SCI, information indicating the set of reservable resource intervals, information indicating whether the PSCCH or PSSCH DM RS is used for L1 RSRP measurement in the sensing operation, information indicating the start position of the sensing window, information indicating the end position of the sensing window, information indicating the sidelink synchronization configuration, etc.

PSSCH is placed in the OFDM symbol following the OFDM symbol in which PSCCH is placed. For example, PSSCH is placed in the second or subsequent OFDM symbols in a slot.

The information indicating the configuration of the PSCCH includes information indicating the number of symbols in the PSCCH, information indicating the number of RBs that make up the PSCCH, information indicating the initial value (ID) of the scrambling of the DM RS of the PSCCH, and information indicating the number of bits reserved in the first stage SCI.

The information indicating the configuration of the PSSCH includes information indicating candidates for β offsets used to determine the number of coded modulation symbols in the 2nd stage SCI, information indicating the time domain pattern of the DM RS of the PSSCH, and information indicating a scaling factor for limiting the number of resource elements assigned to the 2nd stage SCI of the PSSCH.

The information indicating the configuration of the PSFCH includes information indicating the set of PRBs used for transmitting and receiving the PSFCH, information indicating the number of cyclic shift pairs used for PSFCH transmission that can be multiplexed onto one PRB, information indicating the number of PSFCH resources available for multiplexing HARQ-ACK information, information indicating a scrambling ID for sequence hopping of the PSFCH, information indicating the interval of the PSFCH resources, and information indicating the minimum time gap between the PSSCH and the PSFCH. A bitmap is used for the information indicating the set of PRBs used for transmitting and receiving the PSFCH, and each bit indicates whether the PRB corresponding to the bit position is included in the set of PRBs used for transmitting and receiving the PSFCH. The information indicating the interval of the PSFCH resources is information indicating the interval of the slots in which the PSFCH resources are arranged. For example, information indicating an interval of one slot, an interval of two slots, or an interval of four slots is used.

The information indicating the parameters of the sidelink transmission power control includes information indicating the parameters used for the transmission power control based on the sidelink path loss and information indicating the parameters used for the transmission power control based on the downlink path loss.

The information indicating the sidelink synchronization configuration includes information indicating whether the sidelink synchronization configuration is used for transmitting and receiving the sidelink synchronization signal when the terminal device 1 is synchronized to the GNSS (Global Navigation Satellite System) or whether the sidelink synchronization configuration is used for transmitting and receiving the sidelink synchronization signal when the terminal device 1 is synchronized to the base station device 3, information indicating the type of hysteresis when evaluating the terminal device 1 for synchronization reference, information indicating the number of sidelink SSB transmissions within one sidelink SSB (Synchronization Signal Block) section, information indicating the section and starting position of the sidelink SSB, information indicating the ID of the sidelink synchronization signal, information indicating the threshold used to determine the transmission of the sidelink synchronization signal, etc.

The information indicating the configuration of the sidelink radio bearer includes information indicating whether the terminal device 1 is the synchronization source, information indicating parameters used to detect a sidelink radio link failure, information indicating the frequency used for the sidelink, information indicating the configuration for the method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1, information indicating the configuration for the method (mode 2) in which the terminal device 1 autonomously selects resources, information indicating whether CSI reporting is used, information indicating whether sidelink beam-related information reporting is used, information indicating the configuration of the sidelink scheduling request, information indicating the priority of transmission and reception of the sidelink SSB, information indicating the RLC mode, information indicating the configuration of the sidelink logical channel, information indicating the configuration of the sidelink RLC, etc.

The information indicating the frequency at which the sidelink is used further includes information indicating the subcarrier spacing, information indicating the frequency position of the sidelink SSB, information indicating the synchronization priority, etc.

The information indicating the configuration for the method (mode 1) in which the base station device 3 instructs the terminal device 1 about scheduling information includes information indicating the RNTI used by the base station device 3 to scramble the CRC of a DCI format (e.g., DCI format 3_0) including scheduling information for the terminal device 1, information indicating the configuration of the sidelink MAC, and information indicating the configuration of the sidelink Configured Grant. The information indicating the configuration of the sidelink MAC includes information indicating the configuration of the sidelink BSR and information indicating a threshold used to determine the priority of sidelink transmission and uplink transmission. The information indicating the configuration of the Sidelink Configured Grant includes information indicating an ID for identifying the Sidelink Configured Grant, information indicating the frequency resource of the Sidelink Configured Grant, information indicating the time resource of the Sidelink Configured Grant, information indicating the HARQ process ID of the Sidelink Configured Grant, information indicating the resources used for the Sidelink HARQ-ACK transmission, information indicating the duration of the Sidelink Configured Grant, information indicating the resource pool to which the Sidelink Configured Grant is applied, information indicating the starting subchannel of the Sidelink Configured Grant, etc.

The information indicating the configuration for the method (mode 2) in which the terminal device 1 autonomously (automatically) selects resources includes information indicating PSSCH transmission parameters such as MCS, subchannel number, number of retransmissions, and transmission power parameters, information indicating the probability used in resource selection, and information indicating the threshold value for RSRP used in resource selection.

In mode 2, the terminal device 1 selects resources on a slot-by-slot basis, for example. In mode 2, the terminal device 1 reserves resources on a slot-by-slot basis, for example.

A time interval (resource reservation interval) between the first selected set of resources and the next reserved set of resources is set for each resource pool. The base station device 3 transmits RRC signaling including a parameter indicating the time interval to the terminal device 1. The terminal device 1 receives RRC signaling including a parameter indicating the time interval from the base station device 3. The time interval is also used as the time interval between the reserved sets of resources.

A guard time (also called a gap) is provided at the last time section of the slot. Switching between transmission and reception occurs during the guard time.

The terminal device 1 recognizes resources (resources of multiple consecutive slots) secured in other terminal devices 1 from the information (1st stage SCI information) contained in the received PSCCH, excludes those resources, and selects and reserves resources to be used by the terminal device 1 from resources that were not recognized as secured in other terminal devices 1. The terminal device 1 may also recognize resources (resources of multiple consecutive slots) secured or reserved in other terminal devices 1 from the 2nd stage SCI information contained in the received PSSCH.

The information indicating the configuration of the sidelink logical channel includes information indicating the sidelink logical channel priority, information indicating the configuration of the scheduling request applicable to the sidelink logical channel, information indicating the bit rate, information indicating the sidelink bucket size interval, information indicating whether to apply HARQ feedback to the sidelink logical channel, information indicating the subcarrier spacing applied to the resource to which the sidelink logical channel is mapped, information indicating the maximum physical channel interval of the resource to which the sidelink logical channel is mapped, information indicating the ID of the sidelink logical channel group, etc.

The information indicating the configuration of the sidelink measurement includes information indicating the frequency at which the sidelink measurement is performed, information indicating the filter coefficient applied to the sidelink measurement, information indicating the interval at which the sidelink measurement results are reported, information indicating the threshold used to decide whether to report the sidelink measurement results, information indicating the interval used to decide whether to report the sidelink measurement results, etc.

Sidelink RRC signaling includes information indicating a delay time limit for sidelink CSI reporting. The information indicating the delay time limit for sidelink CSI reporting indicates the delay time limit from triggering of sidelink CSI to reporting in slot units. Sidelink RRC signaling includes information indicating a delay time limit for sidelink beam-related information. The information indicating the delay time limit for sidelink beam-related information reporting indicates the delay time limit from triggering of sidelink beam-related information to reporting in slot units.

The sidelink RRC signaling includes information indicating the configuration of the sidelink CSI-RS. The information indicating the configuration of the sidelink CSI-RS includes information indicating the frequency location of the sidelink CSI-RS and information indicating the first location of the sidelink CSI-RS within a slot. The information indicating the frequency location of the sidelink CSI-RS indicates the number of antenna ports (one or two) used for sidelink CSI-RS transmission, and indicates the subcarrier on which the CSI-RS is located for each antenna port.

Sidelink RRC signaling includes information indicating parameters used to detect sidelink beam failure. Information indicating thresholds used to determine beam failure for sidelink radio quality is included.

The terminal device 1 receives the above RRC signaling (RRC parameters). The radio resource control layer processing unit 16 of the terminal device 1 manages the information contained in the RRC signaling, sets various parameters, and controls the processing of each unit.

The terminal device 1 notifies the base station device 3 of information related to the sidelink by RRC signaling. The information includes information indicating the frequencies at which the terminal device 1 is interested in receiving sidelink communications, information indicating the frequencies at which the terminal device 1 is interested in transmitting sidelink communications, information indicating parameters for requesting sidelink transmission resources, information about sidelink capabilities, information indicating the cast type (broadcast, groupcast, unicast) for which sidelink resources are requested, information indicating the destination identity, information about sidelink QoS, information indicating the RLC mode, and information indicating a list of synchronization references used by the terminal device 1.

The radio resource control layer processing unit 36 of the base station device 3 may notify the terminal device 1 of RRC signaling indicating multiple destination identities, taking into account the destination identity requested by the terminal device 1. The terminal device 1 may recognize and set (store) the destination identity of the communication destination for sidelink transmission using the resource pool set by the base station device 3.

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

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

The wireless transceiver 30 may perform one or both of demodulation and decoding processes. The wireless transceiver 30 may deliver a transport block of the 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 wireless transceiver 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 wireless transceiver 30 may generate a baseband signal of a downlink physical signal.

The wireless transceiver 30 may perform some or all of the modulation process, the encoding process, and the transmission process. The wireless transceiver 30 may generate a physical signal based on some or all of the encoding process, the modulation process, and the baseband signal generation process for the transport block. The wireless transceiver 30 may place the physical signal in a certain BWP. The wireless transceiver 30 may transmit the generated physical signal. For example, the wireless transceiver 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 wireless transceiver 30 may attempt to detect information transmitted by an uplink physical signal.

The wireless transmission/reception unit 30 grasps the SS (Search space) configured in the terminal device 1. The wireless transmission/reception unit 30 grasps the search space in the control resource set configured in the terminal device 1. The wireless transmission/reception unit 30 grasps the PDCCH candidates monitored in the terminal device 1 to grasp the search space. The wireless transmission/reception unit 30 grasps which control channel element each PDCCH candidate monitored in the terminal device 1 is composed of (grabs the number of the control channel element in which the PDCCH candidate is composed). The wireless transmission/reception 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 the control resource set configured as the search space of the terminal device. The SS grasping unit grasps the PDCCH candidates (the number of PDCCH candidates, the number of the PDCCH candidate) configured in the search space of the control resource set of the terminal device 1.

The SS grasping unit grasps the configuration of the search area 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 wireless transceiver unit 30 transmits a PDCCH to the terminal device 1 using the PDCCH candidates within the search area of the control resource set.

The transmission unit (also referred to as the 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 by 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 area 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 area where the PDCCH is monitored by the terminal device 1, among multiple search areas set for the terminal device 1.

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

The receiving section of the base station device 3 receives the sidelink HARQ-ACK from the terminal device 1. The terminal device 1 transmits the sidelink HARQ-ACK information acquired from the PSFCH received from the communication destination terminal device 1 via the sidelink to the base station device 3 using the PUCCH.

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

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, and extract a signal in the frequency domain.

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 to which the CP has been added into an analog signal. The baseband unit 33 may output the analogized 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 up-convert 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 of controlling the transmission power.

Each of the units numbered 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units numbered 30 to 36 in the 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 the downlink physical channel, downlink physical signal, uplink physical channel, and uplink physical channel. Physical channel is a general term for the downlink physical channel and uplink physical channel. Physical signal is a general term for the downlink physical signal and uplink physical signal.

The 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 placed in the PUCCH. The radio transceiver unit 10 may transmit the PUCCH in which the uplink control information is placed. The radio transceiver unit 30 may receive the PUCCH in which the uplink control information is placed.

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

The channel state information is also called channel state information bits or channel state information sequences. The scheduling request is also called scheduling request bits or scheduling request sequences. The HARQ-ACK information is also called HARQ-ACK information bits or HARQ-ACK information sequences.

The HARQ-ACK information may consist 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. The ACK may indicate that the decoding of the transport block has been successfully completed. The NACK may indicate that the decoding of the transport block has not been successfully completed. The HARQ-ACK information may include one or more HARQ-ACK bits.

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

The scheduling request may be used to request UL-SCH resources for the 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 the 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 the 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). CQI is an indicator related to the quality of the propagation path (e.g., propagation strength) or the quality of the physical channel, and PMI is an indicator related to the precoder. RI is an indicator related to the transmission rank (or the number of transmission layers).

The channel state information is an indicator regarding 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. The channel measurement may include interference measurement.

The PUCCH may be accompanied by a PUCCH format. Here, the PUCCH format may be the format of the physical layer processing of the PUCCH. The PUCCH format may also be the format of the information transmitted using the PUCCH.

The PUSCH may be transmitted to transmit uplink control information and/or a transport block. The PUSCH may be used to transmit uplink control information and/or 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 scheduling request. The PUSCH is used at least to transmit the 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 the uplink control information and/or a transport block is arranged. The base station device 3 may receive a PUSCH in which the uplink control information and/or a transport block is arranged.

The PRACH may be transmitted to convey the 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 may not be used to transmit information generated in a higher layer. In addition, 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.

The set of antenna ports for the DMRS for the PUSCH (DMRS related to the PUSCH, DMRS included in the PUSCH, DMRS corresponding to the PUSCH) may be given based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for the DMRS for the 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 the Master Information Block (MIB) and/or physical layer control information. Here, the physical layer control information is information generated in the physical layer. The MIB is an RRC message delivered from higher layers on the BCCH (Broadcast Control CHannel).

The PDCCH is used at least for transmitting (transmitting) downlink control information (DCI). The downlink control information may be placed in the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is placed. The base station device 3 may transmit the PDCCH in which the downlink control information is placed.

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 also be interpreted as a set of downlink control information set to a certain downlink control information format.

The base station device 3 may notify the terminal device 1 of the 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 the downlink control information may be described as equivalent. For example, the base station device 3 may include the downlink control information in the 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 one of 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 a downlink assignment (DL assignment) or a 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. DCI format 0_0 includes at least some or all of DCI formats 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. In other words, the DCI format specification field may be included in both the uplink DCI format and the downlink DCI format. Here, the DCI format specification field included in DCI format 0_0 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 the modulation scheme for the PUSCH scheduled by DCI format 0_0 and the target coding rate scheduled by DCI format 0_1. The target coding rate may be a target coding rate for a transport block placed in the PUSCH. The size of the transport block (TBS: Transport Block Size) placed in the PUSCH may be determined based on the target coding rate and part or all of the modulation scheme for the PUSCH.

DCI format 0_0 may not include fields used in CSI requests. DCI format 0_0 may not include a carrier indicator field. DCI format 0_0 may not include a 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 the 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 the 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 the DCI format 0_1 and the target coding rate for the PUSCH scheduled by the DCI format 0_1.

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

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

If 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 in which the PUSCH is placed. 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 placed in 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 placed may be the same as the serving cell of the downlink component carrier on which the PDCCH including the DCI format 0_1 is placed. Based on detecting DCI format 0_1 in a downlink component carrier of a serving cell, the terminal device 1 may recognize that the PUSCH scheduled by DCI format 0_1 is to be placed on the uplink component carrier of the serving cell.

The UL DAI field is at least used 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 on the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted on 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 on 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 on the PUSCH.

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

The terminal device 1 interprets the UL DAI field taking into account the total number of PDSCHs received. 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 the number of PDSCHs whose corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted by PUSCH, indicated by the UL DAI field, as being 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 the number of PDSCHs whose corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted by PUSCH, indicated by the UL DAI field, as being four, and determines that it has missed reception of one PDSCH.

DCI format 1_0 is used for scheduling a PDSCH allocated to a certain cell. DCI format 1_0 includes 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 a PDSCH scheduled by the DCI format. The target coding rate may be a target coding rate for a transport block placed in the PDSCH. The size of the transport block (TBS: Transport Block Size) placed in 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 timing indication field from the PDSCH to the HARQ feedback 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 a PUCCH or a PUSCH containing at least a HARQ-ACK corresponding to a transport block contained 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 a transport block contained in the PDSCH may be n+K1.

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

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

DCI format 1_1 is used for scheduling a PDSCH allocated to a certain cell. DCI format 1_1 includes 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) Career Indicator Field

The DCI format specific field contained 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 containing the last OFDM symbol of the PDSCH to the slot containing 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 containing the last OFDM symbol of the PDSCH to the slot containing 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 placed. In other words, DCI format 1_1 may or may not involve a change in the active downlink BWP. The terminal device 1 may recognize the downlink BWP in which the PDSCH is placed based on detecting DCI format 1_1 used for scheduling the PDSCH.

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

If 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 in which the PDSCH scheduled by DCI format 1_1 is placed. Based on detecting DCI format 1_1 in the downlink component carrier of a serving cell, the terminal device 1 may recognize that the PDSCH scheduled by DCI format 1_1 is placed in 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 arranged may be the same as the downlink component carrier on which the PDCCH including the DCI format 1_1 is arranged. The terminal device 1 may recognize that the PDSCH scheduled by the DCI format 1_1 is arranged on a downlink component carrier based on detecting DCI format 1_1 in the downlink component carrier.

The downlink grant is used at least for scheduling one PDSCH in one serving cell. The downlink grant is used at least for scheduling a PDSCH in the same 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 at least for scheduling one PUSCH in one serving cell.

In addition, various DCI formats may further include fields different from the above-mentioned fields. A field indicating the cumulative number of PDCCHs transmitted (C-DAI: Counter Downlink Assignment Index field) may be included. A field indicating the total number of PDCCHs transmitted (T-DAI: Total Downlink Assignment Index field) may be included.

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 placed in the PDSCH. The base station device 3 may transmit the PDSCH in which the transport block is placed. The terminal device 1 may receive the PDSCH in which the transport block is placed.

The downlink physical signal may correspond to a set of resource elements. The downlink physical signal may not 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 time domain of the downlink. The synchronization signal is a general term for the PSS (Primary Synchronization Signal) and the SSS (Secondary Synchronization Signal).

An SS block (SS/PBCH block) is composed of at least the PSS, 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 is a DMRS for the PBCH that is placed in the slot to which the PBCH is mapped, and may be estimated by the DMRS for the PBCH 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 a DMRS for a PDSCH (DMRS related to a PDSCH, DMRS included in a PDSCH, DMRS corresponding to a PDSCH) may be given based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

The propagation path of a PDSCH may be estimated from the DMRS for the PDSCH. If a set of resource elements through which a PDSCH symbol is transmitted and a set of resource elements through which a DMRS symbol for the PDSCH is transmitted are included in the same precoding resource group (PRG), the PDSCH through which the PDSCH symbol is transmitted at an 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 that PDCCH. If the same precoder is applied (assumed to be applied, assumed to be applied) to a set of resource elements on which a PDCCH symbol is transmitted and a set of resource elements on which a DMRS symbol for that PDCCH is transmitted, the PDCCH on which a PDCCH symbol is transmitted at an antenna port may be estimated by the DMRS for that 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. That is, the transport block delivered from a higher layer on the BCH of the transport layer may be placed on the PBCH of the physical layer. Also, the UL-SCH of the transport layer may be mapped to the PUSCH of the physical layer.

The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, BCCH may be used to deliver RRC messages including MIBs or RRC messages including system information. CCCH may be used to transmit RRC messages including RRC parameters common to multiple terminal devices 1. Here, CCCH may be used, for example, for terminal devices 1 that are not RRC-connected. DCCH may be used to transmit RRC messages dedicated to a certain terminal device 1. Here, 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. In other words, an RRC message containing MIB information may be delivered to the BCH. An RRC message containing system information other than MIB may be delivered to the DL-SCH. The CCCH may be mapped to the DL-SCH or UL-SCH. In other words, an RRC message mapped to the CCCH may be delivered to the DL-SCH or UL-SCH. The DCCH may be mapped to the DL-SCH or UL-SCH. In other words, an RRC message mapped to the DCCH may be delivered to the DL-SCH or UL-SCH.

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

The media access control layer processing unit 15 may implement 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 the C-RNTI (Cell-Radio Network Temporary Identifier).

A physical channel may be mapped to a serving cell. A physical channel may be mapped to a BWP that is configured on a carrier included in the serving cell.

The terminal device 1 may be configured with one or more control resource sets (CORESET: Control Resource SET). The terminal device 1 monitors the PDCCH in one or more control resource sets. Here, monitoring the 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 a set 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 the control resource set, and each CCE may be assigned an index (CCE index).

The set of PDCCH candidates monitored by terminal device 1 is defined in terms of a search space. In other words, the set of PDCCH candidates monitored by terminal device 1 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 a PDCCH candidate may indicate the number of CCEs that make up the PDCCH. A PDDCH candidate may be mapped to one or more CCEs.

The 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 of the search area sets may be associated with at least one control resource set. Each of the search area sets may be included in one control resource set. For each of the search area sets, an index of the control resource set associated with the search area set may be given.

The terminal device 1 can detect the PDCCH and/or DCI for the terminal device 1 by blindly detecting PDCCH candidates included in a search space within a 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 it. The terminal device 1 may multiplex the UCI onto a PUSCH and transmit it. The UCI may include at least one of downlink channel state information (Channel State Information: CSI), a scheduling request (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 the data is successfully decoded, an ACK is generated for the data. If the data is not successfully decoded, a NACK is generated for the data. 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 more transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook including one or more HARQ-ACK bits. The HARQ-ACK bit corresponding to one or more transport blocks may correspond to a PDSCH including the one or more transport blocks.

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

An NDI (New Data Indicator) is indicated in the DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) that includes scheduling information for PDSCH. The NDI field is 1 bit. The terminal device 1 stores (stores) an NDI value for each HARQ process. The base station device 3 stores (stores) an 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 non-updated NDI value 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 the received transport block is a new transmission or a retransmission based on the value of the NDI field of the DCI format (DL assignment). The terminal device 1 compares the value of the NDI field of the detected DCI format with the value of the NDI previously received for the transport block of a certain HARQ process, and if the value is toggled, determines that the received transport block is a new transmission. When the base station device 3 transmits a transport block of a new transmission in a certain HARQ process, it toggles the value of the NDI stored for the HARQ process and transmits the toggled NDI to the terminal device 1. When the base station device 3 transmits a transport block of a retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for the HARQ process, and transmits the untoggled NDI to the terminal device 1. The terminal device 1 compares the value of the NDI field of the detected DCI format with the value of the NDI previously received for the transport block of a certain HARQ process, and if the value is not toggled (they are the same), determines that the received transport block is a retransmission. Note that toggling here means switching between different values.

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 the 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. 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 is a list of 1, 2, 3, 4, 5, 6, 7, or 8 timings. If dl-DataToUL-ACK is a list of 1 timing, the HARQ indication field is 0 bits. If dl-DataToUL-ACK is a list of 2 timings, the HARQ indication field is 1 bit. If dl-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indication field is 2 bits. If dl-DataToUL-ACK is a list of 5, 6, 7, or 8 timings, the HARQ indication field is 3 bits. For example, dl-DataToUL-ACK consists of a list of timings with values ranging from 0 to 31. For example, dl-DataToUL-ACK consists of a list of timings with values ranging from 0 to 63.

The size of the dl-DataToUL-ACK is defined as the number of elements that the dl-DataToUL-ACK contains. 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 of 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 any value of 1, 2, 3, 4, 5, 6, 7, or 8. The index of the dl-DataToUL-ACK may be given, indicated, or indicated by the value indicated by the HARQ 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 eight. For example, if the dl-DataToUL-ACK consists of two elements, the size of the HARQ-ACK codebook is two. Each piece of HARQ-ACK information that constitutes 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 by using PUCCH transmission and/or PUSCH transmission in slot n+k. Here, k may be the number of slots indicated by the HARQ indication field included in the DCI format corresponding to the PDSCH reception. In addition, if the HARQ indication field is not included in the DCI format, k may be given by the upper 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 reception. K1 may be a set of k. For example, when dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), in the PUCCH of slot n, HARQ-ACK information is transmitted for PDSCH reception in slot n-1, PDSCH reception in slot n-2, PDSCH reception in slot n-3, PDSCH reception in slot n-4, PDSCH reception in slot n-5, PDSCH reception in slot n-6, PDSCH reception in slot n-7, and PDSCH reception in slot n-8. When the terminal device 1 actually receives a PDSCH in a slot corresponding to the candidate PDSCH reception, it sets an ACK or NACK as the HARQ-ACK report based on the transport block contained in the PDSCH, and when it does not receive a PDSCH in a slot corresponding to the candidate PDSCH reception, it sets a NACK as the HARQ-ACK information.

The HARQ-ACK codebook may be based on at least some or all of the set of monitoring occasions for PDCCH, the value of the counter DAI field. The HARQ-ACK codebook may be based on the value of the UL DAI field. The HARQ-ACK codebook may be based on the value of the DAI field. The HARQ-ACK codebook may be 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 opportunities for HARQ-ACK information transmitted in a PUCCH placed in a slot with 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 opportunities for HARQ-ACK information transmitted in a PUCCH placed in a slot with index n is also referred to as a set of PDCCH monitoring opportunities for slot n (monitoring occasions for PDCCH 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 a 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 placed 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) the 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) the 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, the cumulative number of PDCCHs detected up to a PDCCH monitoring opportunity in the serving cell among M PDCCH monitoring opportunities (or may be 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 PDCCHs detected up to PDCCH monitoring opportunity m among M PDCCH monitoring opportunities (or may be a value at least related to the cumulative number). The Total DAI may also be referred to as T-DAI (Total Downlink Assignment Index).

Physical signal is also a general term for sidelink physical channel and sidelink physical signal. Physical channel is also a general term for sidelink physical channel. Physical signal is also a general term for sidelink physical signal.

A sidelink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. A sidelink physical channel is a physical channel used in a sidelink. The sidelink physical channel may be transmitted by the radio transceiver unit 10. The sidelink physical channel may be received by the radio transceiver unit 10. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following sidelink physical channels are used.
・PSBCH (Physical Sidelink Broadcast CHannel)
・PSCCH (Physical Sidelink Control CHannel)
・PSSCH (Physical Sidelink Shared CHannel)
・PSFCH (Physical Sidelink Feedback CHannel)

The PSBCH is transmitted to convey the DFN (Direct Frame Number), the TDD UL-DL configuration, the slot index (the slot index of the slot in which the PSBCH is placed), and the in-coverage indicator (an identifier indicating whether the transmitting terminal device 1 is located within the coverage of the base station device 3).

The PSCCH is used at least for transmitting (transmitting) sidelink control information (SCI). The sidelink control information may be placed in the PSCCH. The terminal device 1 may receive the PSCCH in which the sidelink control information is placed. The terminal device 1 may transmit the PSCCH in which the sidelink control information is placed.

The sidelink control information is transmitted and received in the form of a sidelink control information format (SCI format). The SCI transmitted and received on the PSCCH is called ^1st stage SCI. The SCI transmitted and received on the PSSCH is called ^2nd stage SCI. ^{The 1st} stage SCI format may include SCI format 1-A. SCI format 1-A is used for scheduling the PSSCH and the ^2nd stage SCI. The SCI format 1-A includes a field indicating a priority, a field indicating a frequency resource allocation, a field indicating a time resource allocation, a field indicating a resource reservation period, a field indicating a DM RS pattern, a field indicating a ^2nd stage SCI format (SCI format 2-A, SCI format 2-B), a field indicating a beta offset (a parameter used to determine the amount of resources for ^{the 2nd} stage SCI), a field indicating the number of DM RS ports, a field indicating an MCS, a field indicating an MCS table, and a field including a PSFCH overhead indication.

The ^2nd stage SCI is used for decoding the PSSCH. SCI format 2-A includes HARQ process number, NDI, RV (Redundancy version), Source ID, Destination ID, HARQ feedback enable/disable indicator, cast type indicator (unicast, broadcast, groupcast), and CSI request information. SCI format 2-B includes HARQ process number, NDI, RV, Source ID, Destination ID, HARQ feedback enable/disable indicator, Zone ID, and communication range request information.

The PSSCH may be transmitted to transmit sidelink data (sidelink transport block, sidelink PDU) and the ^2nd stage SCI. The PSSCH may be used to transmit the sidelink data and the ^2nd stage SCI. The terminal device 1 may transmit the sidelink data and the PSSCH in which the ^2nd stage SCI is arranged. The terminal device 1 may receive the sidelink data and the PSSCH in which ^{the 2nd} stage SCI is arranged.

PSFCH is used to transmit HARQ-ACK information corresponding to PSSCH reception. Terminal device 1 transmits PSFCH in which HARQ-ACK information is placed. Terminal device 1 receives PSFCH in which HARQ-ACK information is placed.

The sidelink physical signal may correspond to a set of resource elements. The sidelink physical signal may not be used to convey information generated in a higher layer. The sidelink physical signal may be used to convey information generated in a physical layer. The radio transceiver 10 may transmit the sidelink physical signal. The radio transceiver 10 may receive the sidelink physical signal. In the sidelink of the wireless communication system according to one aspect of the present embodiment, at least some or all of the following sidelink physical signals may be used.
・Sidelink Synchronization Signal (S-SS)
・Side link DM RS
・Sidelink CSI-RS
・Side link PT-RS

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

Sidelink DM RS is a general term for DM RS for PSBCH, DM RS for PSCCH, and DM RS for PSSCH. The time domain pattern of the DM RS for PSSCH is selected by the transmitting terminal device 1. The time domain patterns of the selection candidates are configured for each resource pool.

Sidelink CSI-RS is a reference signal used for measuring the sidelink channel. It is configured with time resource allocation (symbol position to be allocated), frequency resource allocation, number of antenna ports, and number of layers for CSI-RS. The terminal device 1 reports channel state information measured based on the sidelink CSI-RS using MAC CE.

Sidelink PT-RS may be supported only in the high frequency band (FR2). The time and frequency density of sidelink PT-RS is configured per resource pool.

An AGC (Access Gain Control) signal may be used. The AGC signal may be placed in the first OFDM symbol of the slot.

The terminal device 1 may report sidelink HARQ-ACK information received from the destination terminal device 1 to the base station device 3 using the uplink PUCCH. A semi-static HARQ-ACK codebook or a dynamic HARQ-ACK codebook may be used.

The base station device 3 may notify the terminal device 1 of sidelink scheduling information using a DCI format. DCI format 3_0 is used for scheduling the PSCCH and PSSCH. DCI format 3_0 is configured to include some or all of the following information:
Resource pool index Time gap HARQ process number NDI
Subchannel allocation information SCI format 1_A field Timing indicator for feeding back HARQ-ACK of PSSCH corresponding to PSFCH reception PUCCH resource indicator Configuration index Sidelink allocation index counter

The resource pool index indicates the resource pool used for the scheduled PSCCH and PSSCH. The time gap indicates the time from reception of DCI format 3_0 to sidelink transmission. The subchannel allocation information indicates the subchannel used for the scheduled PSCCH and PSSCH. The SCI format 1_A field includes information on frequency resource allocation and time resource allocation of SCI format 1_A transmitted by the terminal device 1 on the PSCCH. The timing indicator for feeding back HARQ-ACK of PSSCH corresponding to PSFCH reception indicates the timing at which the terminal device 1 feeds back HARQ-ACK information obtained by receiving PSFCH from the counterpart terminal device 1 using PUCCH. The PUCCH resource indicator indicates the PUCCH resource used to feed back HARQ-ACK information obtained by receiving PSFCH. The configuration index indicates the configuration of the sidelink Configured grant. The sidelink allocation index counter indicates the number of sidelink allocations allocated by the base station device 3 to the terminal device 1 within a certain period.

In resource allocation mode 2 in which the terminal device 1 automatically selects a sidelink grant, the terminal device 1 selects a resource from a resource pool. The terminal device 1 selects a resource from a resource pool for reporting sidelink beam-related information. The terminal device 1 excludes resources recognized by an SCI transmitted by another terminal device 1 from the selection candidates. Resources indicated by an SCI transmitted by another terminal device 1 are reserved and used by the other terminal device 1. If the RSRP of the detected PSSCH or the RSRP of the detected PSCCH is greater than a set value, the terminal device 1 excludes the resource corresponding to the PSSCH or PSCCH from the selection candidates. The resource may be reserved and used by another terminal device 1. The terminal device 1 finally selects one resource from the narrowed-down pool of resource candidates.

In sidelink resource allocation mode 2, the number of reserved resources is set by RRC signaling or pre-configured. In the time axis of a set of resources, the second or third one-unit resource other than the first one-unit resource is the reserved resource. The interval (in ms) between the first one-unit resource and the second one-unit resource, and the interval between the second one-unit resource and the third one-unit resource are set by RRC signaling or pre-configured. The interval between the reserved resources may be selected randomly.

When the terminal device 1 detects that the radio quality of the sidelink has deteriorated below a preset threshold, it determines that the sidelink beam has failed. The terminal device 1 receives information indicating the above threshold used to determine the sidelink beam failure by RRC signaling. When the terminal device 1 determines that the sidelink beam has failed, it determines to report the sidelink beam failure information (Sidelink BFR MAC CE) to the other terminal device 1 of the communication destination. When the terminal device 1 determines that the sidelink beam failure information (Sidelink BFR MAC CE) is to be reported to the other terminal device 1 of the communication destination, it selects to automatically (autonomously) generate a sidelink grant in the MAC entity (medium access control layer processing unit 15). When the terminal device 1 selects to automatically (autonomously) generate a sidelink grant, it starts a transmission resource selection check procedure in sidelink resource allocation mode 2. The terminal device 1 initiates a transmission resource selection check procedure in Sidelink resource allocation mode 2 in a resource pool for reporting sidelink beam failure information.

The terminal device 1 determines whether sidelink beam-related information reporting has been triggered. The sidelink beam-related information is, for example, a beam instruction, L1-RSRP, or L1-SINR. The terminal device 1 receives information indicating a delay time limit for the sidelink beam-related information report by RRC signaling. When the terminal device 1 determines that sidelink beam-related information reporting has been triggered, that is, when it determines that the sidelink beam-related information is to be reported to another terminal device 1 of the communication partner, it sets a value indicated by the information indicating the delay time limit for the sidelink beam-related information report to a timer (sl-BI-ReportTimer) (first timer). When the sidelink beam-related information report is triggered, the terminal device 1 starts the sl-BI-ReportTimer. When the sl-BI-ReportTimer expires, the terminal device 1 cancels the triggered sidelink beam-related information report. When the terminal device 1 acquires resources for a new transmission, it multiplexes a signal including sidelink beam related information (MAC CE including sidelink beam related information) (Sidelink BI Reporting MAC CE) onto the resources, stops the sl-BI-ReportTimer, and cancels the triggered sidelink beam related information report. The terminal device 1 starts processing a sidelink scheduling request when sidelink beam related information reporting is triggered. In the terminal device 1, one scheduling request configuration is mapped to the sidelink beam related information reporting. The scheduling request configuration mapped to the sidelink beam related information reporting may be configured independently of the scheduling request configuration mapped to the CSI reporting. The terminal device 1 transmits a scheduling request to the base station device 3 to request resources for sidelink beam related information reporting from the base station device 3. The base station device 3 transmits a DCI format indicating the resources to the terminal device 1 in Sidelink resource allocation mode 1. Upon receiving the DCI format, terminal device 1 reports sidelink beam-related information using the allocated resources.

As described above, the embodiment of the present invention can appropriately exchange sidelink beam failure information as sidelink beam-related information between terminal devices 1 in sidelink resource allocation mode 2, and can appropriately reconfigure the sidelink beam. As described above, the embodiment of the present invention can appropriately exchange beam instructions, L1-RSRP, or L1-SINR as sidelink beam-related information between terminal devices 1 in sidelink resource allocation mode 1, and can appropriately perform sidelink beam maintenance.

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

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

The "computer system" referred to here is a computer system built into the terminal device 1 or base station device 3, and includes hardware such as the OS and peripheral devices. Also, the "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into the computer system.

Furthermore, "computer-readable recording medium" may include something that dynamically holds 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 holds 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 a case. The above program may also be one that realizes part of the functions described above, or one that can realize the functions described above in combination with a program already recorded in the computer system.

The terminal device 1 may be composed of at least one processor and at least one memory including 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 processes described in the above embodiments using the processor. The base station device 3 may be composed of at least one processor and at least one memory including 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 processes described in the above embodiments using the processor.

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. 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-mentioned embodiments may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) and/or NG-RAN (NextGen RAN, NR RAN).Furthermore, the base station device 3 in the above-mentioned embodiments may have some or all of the functions of an upper node for eNodeB and/or gNB.

Furthermore, in the above-described embodiments, some or all of the terminal device 1 and base station device 3 may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chip set. Each functional block of the terminal device 1 and base station device 3 may be individually formed into a chip, or some or all may be integrated into a chip. Furthermore, the integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI appears due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

In addition, in the above-mentioned embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this, and can also be applied to terminal devices or communication devices such as stationary or non-movable 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 design modifications and the like that do not depart from the gist of the invention are also included. Furthermore, various modifications of one aspect of the present invention are possible within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Also included are configurations in which elements described in the above embodiments are substituted for elements that have similar effects.

One aspect of the present invention can be used, for example, in a communication system, a communication device (e.g., a mobile phone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (e.g., a communication chip), or a program, etc.

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 Media access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims (4)

A terminal device having a processor and a memory for storing computer program code, the terminal device performing operations including receiving RRC signaling including information indicating a delay time limit for sidelink beam related information reporting, setting a timer to a value indicated by the information indicating the delay time limit for the sidelink beam related information reporting, starting the timer when the sidelink beam related information reporting is triggered, stopping the timer when a signal including sidelink beam related information is transmitted while the timer is timing, and canceling the triggered sidelink beam related information reporting when the timer expires. The terminal device according to claim 1, further comprising: when the sidelink beam-related information reporting is triggered, transmitting a scheduling request to the base station device using a scheduling request configuration for the sidelink beam-related information reporting. The terminal device according to claim 1, wherein the sidelink beam-related information is at least one of a beam instruction, an L1-RSRP, and an L1-SINR. A communication method used in a terminal device, the communication method including the steps of: receiving RRC signaling including information indicating a delay time limit for sidelink beam-related information reporting; setting a timer to a value indicated by the information indicating the delay time limit for the sidelink beam-related information reporting; starting the timer when the sidelink beam-related information reporting is triggered; stopping the timer when a signal including sidelink beam-related information is transmitted while the timer is timing; and canceling the triggered sidelink beam-related information reporting when the timer expires.

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