Terminal device and communication method

Abstract

The present invention determines a priority that corresponds to a PSFCH on the basis of an SCI format, determines whether transmission of the PSFCH is possible on the basis of the determined priority at a first PSFCH occasion, adjusts the determined priority to be higher when it is determined at the first PSFCH occasion that the transmission of the PSFCH cannot be performed, and determines whether transmission of the PSFCH is possible on the basis of the adjusted priority at a second PSFCH occasion.

Description

Terminal device and communication method

[0001] The present invention relates to a terminal device and a communication method. This application claims priority to Japanese Patent Application No. 2023-125968, filed on August 2, 2023, the contents of which are incorporated herein by reference.

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

[0003] 3GPP is currently studying and standardizing the next-generation standard (NR: New Radio) as the communication method for 5G. NR is expected to meet the requirements for three scenarios: eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication) within a single technology framework.

[0004] NR supports sidelink technology, which allows terminal devices to communicate directly with each other without going through a base station device, and the application of sidelink technology to unlicensed spectrum is also being considered (Non-Patent Document 1).

[0005] "Title: New WID on NR sidelink evolution ", RP-213678, OPPO, LG Electronics. 3GPP TSG RAN Meeting #94e, Dec.6-17, 2021

[0006] It is being considered to configure multiple PSFCH occasions for one PSCCH / PSSCH. If an LBT failure occurs for a certain PSFCH occasion and a terminal device on the PSCCH / PSSCH receiving side cannot transmit the PSFCH, the terminal device on the PSCCH / PSSCH transmitting side cannot acquire HARQ-ACK information and may have to retransmit the PSCCH / PSSCH. By configuring multiple PSFCH occasions for one PSCCH / PSSCH, the terminal device on the PSCCH / PSSCH receiving side can retry transmitting the PSFCH with a different PSFCH occasion even if an LBT failure occurs in a certain PSFCH occasion. This makes it possible to alleviate the problem of not being able to exchange HARQ-ACK information due to an LBT failure. One aspect of the present invention provides a terminal device and a communication method used in the terminal device that can support efficient PSFCH transmission and reception when multiple PSFCH occasions are configured for one PSCCH / PSSCH.

[0007] (1) A first aspect of the present invention is a terminal device including a processor and a memory that stores computer program code, and performs operations including: determining a priority corresponding to a PSFCH based on an SCI format; determining whether to transmit the PSFCH based on the determined priority in a first PSFCH occasion; adjusting the determined priority to a higher value when it is determined that the PSFCH cannot be transmitted in the first PSFCH occasion; and determining whether to transmit the PSFCH based on the adjusted priority in a second PSFCH occasion.

[0008] (2) Furthermore, the first PSFCH occasion and the second PSFCH occasion are PSFCH occasions configured for transmitting HQRA-ACK of the same PSSCH.

[0009] (3) Furthermore, whether or not the PSFCH can be transmitted is determined when multiple PSFCH transmissions occur simultaneously when the LBT is successful.

[0010] (4) A second aspect of the present invention is a communication method used in a terminal device, comprising: a step of determining a priority corresponding to a PSFCH based on an SCI format; a step of determining whether to transmit the PSFCH based on the determined priority in a first PSFCH occasion; a step of adjusting the determined priority to a higher value when it is determined that the PSFCH cannot be transmitted in the first PSFCH occasion; and a step of determining whether to transmit the PSFCH based on the adjusted priority in a second PSFCH occasion.

[0011] (5) Furthermore, the first PSFCH occasion and the second PSFCH occasion are PSFCH occasions configured for transmitting HQRA-ACK of the same PSSCH.

[0012] (6) Furthermore, whether or not the PSFCH can be transmitted is determined when multiple PSFCH transmissions occur simultaneously when the LBT is successful.

[0013] According to one aspect of the present invention, it is possible to support efficient transmission and reception of PSFCH.

[0014] FIG. 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. FIG. 2 is a schematic diagram showing an example of a resource grid in a subframe according to an aspect of the present embodiment. FIG. 3 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. FIG. 4 is a schematic block diagram showing a configuration of a base station device 3 according to an aspect of the present embodiment. FIG. 5 is a diagram showing an example of interlace mapping according to an aspect of the present embodiment. FIG. 6 is a diagram showing an example of a case where a time domain for PSFCH is preset in a part of a COT according to an aspect of the present embodiment. FIG. 7 is a diagram showing an example of a case where multiple PSFCH occasions are configured for one PSCCH / PSSCH according to an aspect of the present embodiment. FIG. 8 is a diagram showing a process of determining priority for PSFCH transmission according to an aspect of the present embodiment.

[0015] Hereinafter, an embodiment of the present invention will be described.

[0016] "A and / or B" may be a term that includes "A", "B", or "A and B".

[0017] The parameter or information indicating one or more values ​​may mean that the parameter or information includes at least a parameter or information indicating the one or more values. The upper layer parameter may be a single upper layer parameter. The upper layer parameter may be an information element (IE) including multiple parameters.

[0018] Fig. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In Fig. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3 (gNB). Hereinafter, the terminal devices 1A to 1D are also referred to as terminal devices 1 (UE).

[0019] 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 cell on which the procedure has been performed). The PSCell is a serving cell on which a random access procedure is performed by the terminal device 1. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. The serving cell identity is a short identifier for identifying a serving cell. The serving cell identity may be provided by a higher layer parameter.

[0020] A serving cell group (cell group) is a general term for an MCG, an SCG, and a PUCCH cell group. A serving cell group may include one or more serving cells (or component carriers). One or more serving cells (or component carriers) included in a serving cell group may be operated by carrier aggregation.

[0021] The base station device 3 communicates with the terminal device 1 using different frequency bands (carrier frequencies, frequency spectrums). This operation (multi-carrier operation) may be referred to as carrier aggregation or dual connectivity. Different cells (serving cells) use different frequency bands. In the base station device 3 and the terminal device 1, among the multiple cells used in carrier aggregation, one cell may use a downlink frequency band and an uplink frequency band, and the other cells may use only the downlink frequency band, or the other cells may also use a downlink frequency band and an uplink frequency band. The terminal device 1 makes an initial connection with the base station device 3, and after the connection with the base station device 3 is established, multiple cell connections are added. A frequency band used for communication is added to the terminal device 1. A cell (serving cell) used for communication is added to the terminal device 1. A connection with the base station device 3 is added to the terminal device 1.

[0022] 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.

[0023] In a wireless communication system, the terminal device 1 and the base station device 3 may use one or more communication methods. For example, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) may be used in the downlink of the wireless communication system. Furthermore, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which modified precoding is applied prior to signal generation in CP-OFDM. Here, modified precoding is also referred to as DFT precoding.

[0024] CP-OFDM may be used for the side link between the terminal devices 1. Furthermore, DFT-s-OFDM may be used for the side link between the terminal devices 1.

[0025] As shown in Fig. 1, the base station device 3 may be configured with one transceiver device (or transmission point, transmission device, reception point, reception device, 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.

[0026] The subcarrier spacing (SCS: SubCarrier Spacing) Δf for a certain subcarrier spacing setting μ is Δf = 2 μ For example, the subcarrier spacing setting μ may indicate any of 0, 1, 2, 3, and 4.

[0027] Time unit (time unit) T ｃ = 1 / (Δf ｍａｘ ×N ｆ ) may be used to represent the length in the time domain, where Δf ｍａｘ = 480 kHz.ｆ = 4096. The constant κ may be κ = Δf ｍａｘ ×N ｆ / (Δf ｒｅｆ N ｆ，ｒｅｆ ) may be 64. ｒｅｆ may be 15 kHz. ｆ，ｒｅｆ is 2048.

[0028] 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.

[0029] 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.

[0030] A radio frame may include 10 subframes, where the length of the subframes, Tsf, may be (Δfmax×Nf / 1000)×Ts=1 ms, and the number of OFDM symbols per subframe, may be Nsubframe,μsymb=Nslotsymb×Nsubframe,μslot.

[0031] An OFDM symbol is used as a time domain unit for a communication scheme used in a wireless communication system. For example, an OFDM symbol may be used as a time domain unit for CP-OFDM. Also, an OFDM symbol may be used as a time domain unit for DFT-s-OFDM.

[0032] A slot may be configured to include multiple OFDM symbols. For example, one slot may be configured by Nslotsymb consecutive OFDM symbols. For example, in a normal CP setting, Nslotsymb=14 may be used. Also, in an extended CP setting, Nslotsymb=12 may be used.

[0033] The slots may be indexed in the time domain. For example, the slot index nμs may be given in ascending order as integer values ​​ranging from 0 to Nsubframe,μslot−1 in subframes. Also, the slot index nμs,f may be given in ascending order as integer values ​​ranging from 0 to Nframe,μslot−1 in radio frames.

[0034] 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 represents the OFDM symbol index lsym, and the vertical axis represents the subcarrier index ksc. The resource grid of Fig. 2 includes Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, and x represent the bandwidth of the SCS-specific carrier. The values ​​of Nsize, μgrid, and x are expressed in resource blocks.

[0035] Within the resource grid, a resource identified by a subcarrier index ksc and an OFDM symbol index lsym is also called a resource element (RE).

[0036] A resource block (RB) includes NRBsc consecutive subcarriers. The resource block is a collective term for a common resource block, a physical resource block (PRB), and a virtual resource block (VRB). For example, NRBsc may be 12.

[0037] A Bandwidth Part (BWP) may be configured as a subset of the resource grid. Here, a BWP configured for the downlink is also referred to as a downlink BWP. A BWP configured for the uplink is also referred to as an uplink BWP.

[0038] The BWP configured for the sidelink is also called the sidelink BWP.

[0039] Carrier aggregation may be performing communication using a plurality of aggregated serving cells. Also, carrier aggregation may be performing communication using a plurality of aggregated component carriers. Also, carrier aggregation may be performing communication using a plurality of aggregated downlink component carriers. Also, carrier aggregation may be performing communication using a plurality of aggregated uplink component carriers.

[0040] An example of the configuration of the terminal device 1 according to one aspect of this embodiment will be described below.

[0041] 3 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. As shown in the figure, the terminal device 1 includes a radio transmission / reception unit 10 and an upper layer processing unit 14. The radio transmission / reception unit 10 includes at least an antenna unit 11, an RF (Radio Frequency) unit 12, and part or all of a baseband unit 13. The upper layer processing unit 14 includes at least a medium access control layer processing unit 15 and part or all of a radio resource control layer processing unit 16. The radio transmission / reception unit 10 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0042] The wireless transmission / reception unit 10 performs physical layer processing.

[0043] For example, the radio transceiver 10 may generate a baseband signal of an uplink physical channel. Here, a transport block delivered from a higher layer on the UL-SCH may be mapped to the uplink physical channel. For example, the radio transceiver 10 may generate a baseband signal of an uplink physical signal.

[0044] For example, the radio 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 a DL-SCH. For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical signal.

[0045] For example, the radio transceiver unit 10 may generate a baseband signal of a sidelink physical channel. For example, the radio transceiver unit 10 may generate a baseband signal of a sidelink physical signal. For example, the radio transceiver unit 10 may attempt to detect information transmitted by the sidelink physical channel. For example, the radio transceiver unit 10 may attempt to detect information transmitted by the sidelink physical signal.

[0046] 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 to detect downlink control information.

[0047] A receiving unit of the terminal device 1 receives the PDSCH. A receiving processing unit of the terminal device 1 performs processing to receive the PDSCH in the downlink frequency band (cell, component carrier, carrier). The receiving processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDSCH.

[0048] 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 sidelink control information. The receiving unit of the terminal device 1 determines the frequency resources (interlaces and resource blocks, described later) that constitute the PSCCH. The receiving unit of the terminal device 1 determines the OFDM symbols in which the PSCCH can be allocated. 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 may blind decode the PSCCH using two or more symbols (OFDM symbols) 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.

[0049] A transmitter (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for a PDSCH. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK in an uplink frequency band (cell, component carrier, carrier).

[0050] 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 the HARQ-ACK in the sidelink frequency band. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK on the PSFCH. The transmission processing unit of the terminal device 1 may transmit the HARQ-ACK on the PSSCH. The transmission processing unit of the terminal device 1 does not have to transmit a HARQ-ACK for the PSSCH.

[0051] The transmission processing unit of the terminal device 1 transmits a common interlaced signal in a time domain in which a PSFCH occasion (which may also be referred to as a PSFCH transmission occasion) is set. The common interlaced signal is a signal with an interlaced signal configuration. An interlaced signal is a signal allocated to resources distributed across the entire frequency band. The common interlaced signal is a common signal that can be transmitted by multiple terminal devices 1. When transmitting HARQ-ACK information in a time domain in which a PSFCH occasion is set, the transmission processing unit of the terminal device 1 transmits a PSFCH in which a signal generated from the HARQ-ACK information is allocated and a common interlaced signal in the same time domain. Note that the signal generated from the HARQ-ACK information and the common interlaced signal may be collectively defined as a PSFCH signal. In this case, the common interlaced signal is used for the purpose of meeting OCB requirements.

[0052] Resources to which signals generated from HARQ-ACK information are allocated are called dedicated PRBs (Dedicated PRB(s) for PSFCH). One dedicated PRB or multiple dedicated PRBs are used for one PSFCH. The number of dedicated PRBs used for one PSFCH is configured by the base station device 3 or configured in advance in the specifications. The number of PRBs constituting the dedicated PRB used for one PSFCH may be configured for each resource pool. The number of PRBs constituting the dedicated PRB used for one PSFCH may be configured for each sidelink BWP.

[0053] A plurality of resource blocks in one or more interlaces are indexed (numbered) as individual PRBs. A dedicated PRB is a unit of resource. Within one or more interlaces, resource blocks in the interlace with the smallest interlace index are indexed as individual PRBs, starting with the resource block with the smallest resource block index (lowest frequency). After all resource blocks in the interlace with the smallest interlace index are indexed as individual PRBs, resource blocks in the interlace with the next largest interlace index are indexed as individual PRBs, starting with the resource block with the smallest resource block index (lowest frequency). This type of individual PRB indexing is performed for a plurality of resource blocks in one or more interlaces in which a PSFCH may be allocated.

[0054] The numbering for individual PRBs may be defined as follows: Numbering starts from the resource block with the smallest index in the interlace with the smallest index among multiple interlaces in ascending order, then numbering continues for the resource block with the next index in the same interlace, numbering continues for the resource block with the largest index in the same interlace, and then numbering continues from the resource block with the smallest index in the interlace with the next index in ascending order as well, up to the resource block with the largest index in the interlace with the largest index.

[0055] The numbering of resource blocks as dedicated PRBs is performed for multiple resource blocks of multiple interlaces excluding a common interlace (a specific interlace). The numbering of resource blocks as dedicated PRBs is performed for resource blocks of multiple interlaces in a slot in which a PSFCH can be allocated. The numbering of resource blocks as dedicated PRBs may also be performed for resource blocks of multiple interlaces in a symbol in which a PSFCH can be allocated. Information indicating slots in which a PSFCH can be allocated (such as a slot number or a slot period) is notified from the base station device 3 to the terminal device 1. The slots in which a PSFCH can be allocated are configured from the base station device 3 to the terminal device 1. Information indicating symbols in which a PSFCH can be allocated (such as a symbol number) may be notified from the base station device 3 to the terminal device 1. The symbols in which a PSFCH can be allocated may be configured from the base station device 3 to the terminal device 1. The symbols in which a PSFCH can be allocated may be configured in advance. The number of PSFCH symbols (number of symbols) to be allocated in one slot may be notified from the base station device 3 to the terminal device 1 and configured.

[0056] In this specification, the terms index and number may be interpreted as having the same meaning.

[0057] For example, if there are 100 PRBs (PRB#0, PRB#1, PRB#2, PRB#3, PRB#4, PRB#5, PRB#6, PRB#7, PRB#8, PRB#9, PRB#10, PRB#11, PRB#12, PRB#13, PRB#14, PRB#15, PRB#16, PRB#17, PRB#18, PRB#19, PRB#20, PRB#21, PRB#22, PRB#23, PRB#24, PRB#25, PRB#26, PRB# 27, PRB#28, PRB#29, PRB#30, PRB#31, PRB#32, PRB#33, PRB#34, PRB#35, PRB#36, PRB#37, PRB#38, PRB#39, PRB#40, PRB#41, PRB #42, PRB#43, PRB#44, PRB#45, PRB#46, PRB#47, PRB#48, PRB#49, PRB#50, PRB#51, PRB#52, PRB#53, PRB#54, PRB#55, PRB#56, PR B#57, PRB#58, PRB#59, PRB#60, PRB#61, PRB#62, PRB#63, PRB#64, PRB#65, PRB#66, PRB#67, PRB#68, PRB#69, PRB#70, PRB#71, P RB#72, PRB#73, PRB#74, PRB#75, PRB#76, PRB#77, PRB#78, PRB#79, PRB#80, PRB#81, PRB#82, PRB#83, PRB#84, PRB#85, PRB#86, Assume that PRBs (PRB #87, PRB #88, PRB #89, PRB #90, PRB #91, PRB #92, PRB #93, PRB #94, PRB #95, PRB #96, PRB #97, PRB #98, and PRB #99) are configured, and 10 interlaces (interlace #0, interlace #1, interlace #2, interlace #3, interlace #4, interlace #5, interlace #6, interlace #7, interlace #8, and interlace #9) are configured. The PRBs may be within a resource pool. The interlaces may also be within a resource pool. Note that PRBs are numbered in ascending order from the lowest frequency PRB to the highest frequency within the sidelink BWP.

[0058] Each interlace consists of 10 PRBs. Interlace #0 consists of PRB#0, PRB#10, PRB#20, PRB#30, PRB#40, PRB#50, PRB#60, PRB#70, PRB#80, and PRB#90. Interlace #1 consists of PRB#1, PRB#11, PRB#21, PRB#31, PRB#41, PRB#51, PRB#61, PRB#71, PRB#81, and PRB#91. Interlace #2 consists of PRB#2, PRB#12, PRB#22, PRB#32, PRB#42, PRB#52, PRB#62, PRB#72, PRB#82, and PRB#92. Interlace #3 consists of PRB#3, PRB#13, PRB#23, PRB#33, PRB#43, PRB#53, PRB#63, PRB#73, PRB#83, and PRB#93. Interlace #4 consists of PRB#4, PRB#14, PRB#24, PRB#34, PRB#44, PRB#54, PRB#64, PRB#74, PRB#84, and PRB#94. Interlace #5 consists of PRB#5, PRB#15, PRB#25, PRB#35, PRB#45, PRB#55, PRB#65, PRB#75, PRB#85, and PRB#95. Interlace #6 consists of PRB#6, PRB#16, PRB#26, PRB#36, PRB#46, PRB#56, PRB#66, PRB#76, PRB#86, and PRB#96. Interlace #7 consists of PRB#7, PRB#17, PRB#27, PRB#37, PRB#47, PRB#57, PRB#67, PRB#77, PRB#87, and PRB#97. Interlace #8 consists of PRB#8, PRB#18, PRB#28, PRB#38, PRB#48, PRB#58, PRB#68, PRB#78, PRB#88, and PRB#98. Interlace #9 is composed of PRB #9, PRB #19, PRB #29, PRB #39, PRB #49, PRB #59, PRB #69, PRB #79, PRB #89, and PRB #99.

[0059] Assume that interlace #0 is used as the common interlace. Different interlaces may be used as common interlaces. Among the interlaces used as dedicated PRBs for the PSFCH, the individual PRBs are numbered starting with the smallest-numbered PRB #1 on interlace #1. In interlace #1, PRB #1 is numbered as individual PRB #0, PRB #11 as individual PRB #1, PRB #21 as individual PRB #2, PRB #31 as individual PRB #3, PRB #41 as individual PRB #4, PRB #51 as individual PRB #5, PRB #61 as individual PRB #6, PRB #71 as individual PRB #7, PRB #81 as individual PRB #8, and PRB #91 as individual PRB #9. After all PRBs on interlace #1 have been numbered as dedicated PRBs, the same numbering continues for the next-numbered interlace #2. In interlace #2, PRB #2 is individual PRB #10, PRB #12 is individual PRB #11, PRB #22 is individual PRB #12, PRB #32 is individual PRB #13, PRB #42 is individual PRB #14, PRB #52 is individual PRB #15, PRB #62 is individual PRB #16, PRB #72 is individual PRB #17, PRB #82 is individual PRB #18, and PRB #92 is individual PRB #19. After all PRBs in interlace #2 have been numbered as individual PRBs, similar numbering continues for the next-numbered interlace, #3. In interlace #3, PRB #3 is numbered as individual PRB #20, PRB #13 as individual PRB #21, PRB #23 as individual PRB #22, PRB #33 as individual PRB #23, PRB #43 as individual PRB #24, PRB #53 as individual PRB #25, PRB #63 as individual PRB #26, PRB #73 as individual PRB #27, PRB #83 as individual PRB #28, and PRB #93 as individual PRB #29. After all PRBs in interlace #3 have been numbered as individual PRBs, similar numbering continues for the next-numbered interlace, #4.In interlace #4, PRB #4 is individual PRB #30, PRB #14 is individual PRB #31, PRB #24 is individual PRB #32, PRB #34 is individual PRB #33, PRB #44 is individual PRB #34, PRB #54 is individual PRB #35, PRB #64 is individual PRB #36, PRB #74 is individual PRB #37, PRB #84 is individual PRB #38, and PRB #94 is individual PRB #39. After all PRBs in interlace #4 have been numbered as individual PRBs, similar numbering continues for the next interlace, #5. In interlace #5, PRB #5 is numbered as individual PRB #40, PRB #15 as individual PRB #41, PRB #25 as individual PRB #42, PRB #35 as individual PRB #43, PRB #45 as individual PRB #44, PRB #55 as individual PRB #45, PRB #65 as individual PRB #46, PRB #75 as individual PRB #47, PRB #85 as individual PRB #48, and PRB #95 as individual PRB #49. After all PRBs in interlace #5 have been numbered as individual PRBs, similar numbering continues for the next interlace, #6. In interlace #6, PRB #6 is numbered as individual PRB #50, PRB #16 as individual PRB #51, PRB #26 as individual PRB #52, PRB #36 as individual PRB #53, PRB #46 as individual PRB #54, PRB #56 as individual PRB #55, PRB #66 as individual PRB #56, PRB #76 as individual PRB #57, PRB #86 as individual PRB #58, and PRB #96 as individual PRB #59. After all PRBs in interlace #6 have been numbered as individual PRBs, similar numbering continues for the next interlace, #7. In interlace #7, PRB#7 is numbered as individual PRB#60, PRB#17 as individual PRB#61, PRB#27 as individual PRB#62, PRB#37 as individual PRB#63, PRB#47 as individual PRB#64, PRB#57 as individual PRB#65, PRB#67 as individual PRB#66, PRB#77 as individual PRB#67, PRB#87 as individual PRB#68, and PRB#97 as individual PRB#69.After all PRBs in interlace #7 have been numbered as individual PRBs, the same numbering continues for the next interlace, #8. In interlace #8, PRB #8 is individual PRB #70, PRB #18 is individual PRB #71, PRB #28 is individual PRB #72, PRB #38 is individual PRB #73, PRB #48 is individual PRB #74, PRB #58 is individual PRB #75, PRB #68 is individual PRB #76, PRB #78 is individual PRB #77, PRB #88 is individual PRB #78, and PRB #98 is individual PRB #79. After all PRBs in interlace #8 have been numbered as individual PRBs, the same numbering continues for the next interlace, #9. In interlace #9, PRB#9 is numbered as individual PRB#80, PRB#19 as individual PRB#81, PRB#29 as individual PRB#82, PRB#39 as individual PRB#83, PRB#49 as individual PRB#84, PRB#59 as individual PRB#85, PRB#69 as individual PRB#86, PRB#79 as individual PRB#87, PRB#89 as individual PRB#88, and PRB#99 as individual PRB#89.

[0060] The number name may not be an individual PRB#, but may be a number with a different name, for example, an RB# for PSFCH.

[0061] The base station device 3 transmits information indicating a plurality of resource blocks used for a PSFCH occasion for the above-mentioned numbered resource blocks to the terminal device 1. The terminal device 1 receives information indicating a plurality of resource blocks used for a PSFCH occasion for the above-mentioned numbered resource blocks from the base station device 3. The information indicating the plurality of resource blocks used for a PSFCH occasion includes information indicating a plurality of dedicated PRBs.

[0062] The information indicating the plurality of resource blocks used for the PSFCH occasion may be information indicating the start position (number of the starting individual PRB) of a dedicated PRB used for the PSFCH occasion and the number of dedicated PRBs. The terminal device 1 determines the configuration of resource blocks used for the PSFCH occasion based on the information indicating the plurality of resource blocks used for the PSFCH occasion. The terminal device 1 determines that a number of consecutive dedicated PRBs starting from the dedicated PRB at the start position are used for the PSFCH occasion. The start position of the dedicated PRB and the number of dedicated PRBs may be indicated in separate information fields. A combination of the start position of the dedicated PRB and the number of dedicated PRBs may be indicated in correspondence with a specific value, a specific number, a specific character string, or the like of the information indicating the plurality of resource blocks used for the PSFCH occasion.

[0063] The information indicating the multiple resource blocks used for the PSFCH occasion may be made up of a bitmap for each dedicated PRB. In the bitmap for each dedicated PRB, the dedicated PRB with the smallest number is associated with the leftmost bit (LSB) of the bitmap. A bit value of 0 in the bitmap indicates that the dedicated PRB corresponding to that bit is not configured for the PSFCH occasion (not used for transmitting and receiving the PSFCH), and a bit value of 1 in the bitmap indicates that the dedicated PRB corresponding to that bit is configured for the PSFCH occasion (used for transmitting and receiving the PSFCH). The terminal device 1 determines the configuration of resource blocks to be used for the PSFCH occasion based on information indicating the multiple resource blocks to be used for the PSFCH occasion. The terminal device 1 determines that multiple dedicated PRBs with a bit value of 1 in the bitmap are to be used for the PSFCH occasion.

[0064] The terminal device 1 determines one or more dedicated PRBs to be used for the PSFCH to be transmitted, arranges a signal generated from the HARQ-ACK information, and transmits the signal. The terminal device 1 determines one or more dedicated PRBs to be used for the PSFCH to be received, and demodulates the HARQ-ACK information from the signal received on the dedicated PRBs. For example, the terminal device 1 may determine one or more dedicated PRBs to be used for the PSFCH based at least on the indexes of the subchannels used for the transmitted one or more PSCCHs and / or PSSCHs. For example, the terminal device 1 may determine one or more dedicated PRBs to be used for the PSFCH based at least on the indexes of the subchannels used for the received one or more PSCCHs and / or PSSCHs. For example, the terminal device 1 may determine one or more dedicated PRBs to be used for the PSFCH based at least on the indexes of the slots used for the transmitted one or more PSCCHs and / or PSSCHs. For example, the terminal device 1 may determine one or more individual PRBs to be used for the PSFCH based at least on the indexes of the slots used for one or more received PSCCHs and / or PSSCHs.

[0065] When the PRBs included in the common interlace and the individual PRBs are located within a 1 MHz bandwidth, the terminal device 1 uses only the individual PRBs within that 1 MHz bandwidth and does not use the PRBs included in the common interlace.

[0066] By configuring the individual PRBs as described above, it is possible to separate the frequencies of the multiple individual PRBs used in one PSFCH, and it is possible to avoid setting different transmission powers for different resource blocks in one PSFCH in order to satisfy the constraint of the maximum transmission power density within 1 MHz, thereby supporting efficient transmission.

[0067] 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 using the PSCCH. The transmission unit of the terminal device 1 determines the frequency resources (interlaces, resource blocks) that constitute the PSCCH. The transmission processing unit of the terminal device 1 determines the OFDM symbols 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.

[0068] The upper layer processing unit 14 outputs uplink data (transport blocks) generated by user operations or the like to the radio transceiver unit 10. The upper layer processing unit 14 performs processing of the MAC layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

[0069] The upper layer processing unit 14 outputs the side link data (transport block) to the radio transceiver unit 10.

[0070] A media access control layer processing unit (MAC layer processing unit) 15 included in the upper layer processing unit 14 performs MAC layer processing.

[0071] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the RRC layer. 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. Note that 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.

[0072] For example, the radio resource control layer processing unit 16 may acquire RRC parameters included in an RRC message on a certain logical channel and set the acquired RRC parameters in a storage area of ​​the terminal device 1. The RRC parameters set in the storage area of ​​the terminal device 1 may be provided to a lower layer.

[0073] The radio resource control layer processing unit 16 sets a control resource set based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets (configures) a search space within the control resource set. The radio resource control layer processing unit 16 sets (configures) PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets (configures) the number of PDCCH candidates to be monitored within the control resource set. The radio resource control processing unit 16 sets (configures) an aggregation level for the PDCCH candidates to be monitored within the control resource set.

[0074] The radio resource control layer processing unit 16 sets a DCI format to be monitored within a control resource set. The radio resource control layer processing unit 16 may set a DCI format to be monitored within a search space. The radio resource control layer processing unit 16 sets a DCI format to be monitored within a control resource set based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 may set a DCI format to be monitored within a search space based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 sets one or more DCI formats to be monitored in the reception processing unit.

[0075] The radio resource control layer processing unit 16 performs settings related to a plurality of search areas, each of which is indexed.

[0076] The radio resource control layer processing unit 16 performs settings related to CSI feedback (transmission of channel state information) based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets the CSI feedback transmission period, the CSI feedback transmission start timing (offset), the CSI feedback information type, etc. The radio resource control layer processing unit 16 performs settings related to multiple CSI feedbacks. The settings related to multiple CSI feedbacks are each indexed.

[0077] 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 to be set for the SPS, an offset used to derive the HARQ process ID to be used for the SPS, an RNTI value for scheduling the SPS, etc. The radio resource control layer processing unit 16 performs settings related to multiple SPSs. The settings related to the multiple SPSs are each indexed.

[0078] The radio resource control layer processing unit 16 configures carrier aggregation based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 configures a serving cell (secondary cell, primary secondary cell) as part of the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform reception processing using the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform transmission processing using the uplink component carrier configured in the carrier aggregation configuration.

[0079] The radio resource control layer processing unit 16 performs sidelink-related settings based on RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets parameters related to the sidelink notified from the base station device 3. The parameters related to the sidelink will be described later. For example, the radio resource control layer processing unit 16 sets OFDM symbols in which the PSCCH can be allocated. For example, the radio resource control layer processing unit 16 sets a band in which the PSCCH can be allocated. For example, the radio resource control layer processing unit 16 sets the number of resource blocks or interlaces that constitute one PSCCH. The radio resource control layer processing unit 16 performs settings related to PSCCH transmission and reception in the radio transceiver unit 10. For example, the radio resource control layer processing unit 16 sets slots in which the PSFCH can be transmitted (PSFCH occasions). For example, a slot in which the PSFCH can be transmitted is set every four slots.

[0080] For example, the radio resource control layer processing unit 16 configures multiple PRBs to be used for transmitting and receiving the PSFCH. For example, the radio resource control layer processing unit 16 configures multiple dedicated PRBs to be used for transmitting and receiving the PSFCH. For example, the radio resource control layer processing unit 16 configures multiple dedicated PRBs for PSFCH occasions. For example, the radio resource control layer processing unit 16 configures the number of dedicated PRBs to be used for transmitting and receiving one PSFCH. For example, the radio resource control layer processing unit 16 configures the number of PSFCH occasions corresponding to one PSCCH / PSSCH. For example, the radio resource control layer processing unit 16 configures the number of candidate PSFCH occasions corresponding to one PSCCH / PSSCH transmission. For example, the radio resource control layer processing unit 16 configures multiple dedicated PRBs for each of multiple candidate PSFCH occasions corresponding to one PSCCH / PSSCH transmission. For example, assume that four candidate PSFCH occasions (PSFCH occasion #0, PSFCH occasion #1, PSFCH occasion #2, and PSFCH occasion #3) corresponding to one PSCCH / PSSCH transmission are configured. A first set of multiple dedicated PRBs is configured for PSFCH occasion #0, a second set of multiple dedicated PRBs is configured for PSFCH occasion #1, a third set of multiple dedicated PRBs is configured for PSFCH occasion #2, and a fourth set of multiple dedicated PRBs is configured for PSFCH occasion #3. For example, assume that two candidate PSFCH occasions (PSFCH occasion #0 and PSFCH occasion #1) corresponding to one PSCCH / PSSCH transmission are configured. A first set of multiple dedicated PRBs is configured for PSFCH occasion #0, and a second set of multiple dedicated PRBs is configured for PSFCH occasion #1.

[0081] The medium access control layer processing unit (MAC layer processing unit) 15 activates / deactivates the secondary cell based on a MAC Control Element (MAC CE) 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 a MAC CE (SCell Activation / Deactivation MAC CEs) including information on activation / deactivation of the secondary cell. The medium access control layer processing unit (MAC layer processing unit) 15 deactivates the secondary cell based on a timer. The medium access control layer processing unit (MAC layer processing unit) 15 determines that scheduling has not been performed for the serving cell by the base station device 3 for a certain period of time by measuring with a timer, deactivates the serving cell, and controls the radio transceiver unit 10.

[0082] The medium access control layer processing unit (MAC layer processing unit) 15 processes sidelink HARQ operations, sidelink scheduling requests, sidelink buffer status reports, and CSI reports.

[0083] The radio resource control layer processing unit 16 may include functional information generated based on the functions provided by the terminal device 1 in an RRC message and transmit the information to the base station device 3.

[0084] The wireless transmission / reception unit 10 performs modulation, encoding, and transmission processes. The wireless transmission / reception unit 10 generates a physical signal by encoding data (transport blocks), modulating it, and generating a baseband signal (converting it into a time-continuous signal), and transmits the generated physical signal to the base station device 3 or the terminal device 1.

[0085] The radio transmission / reception unit 10 performs demodulation processing, decoding processing, and reception processing. The radio transmission / reception unit 10 outputs a transport block from the information detected based on the demodulation processing and decoding processing of the received physical signal to the upper layer processing unit 14 on the DL-SCH.

[0086] The radio transceiver unit 10 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver unit 10 stops monitoring the PDCCH in the deactivated serving cell. For example, the radio transceiver unit 10 stops receiving the PDSCH in the deactivated serving cell. For example, the radio transceiver unit 10 stops transmitting the SRS in the deactivated serving cell. For example, the radio transceiver unit 10 stops transmitting the PUSCH in the deactivated serving cell.

[0087] The RF unit 12 converts (down-converts) the signal received via the antenna unit 11 into a baseband signal and removes unnecessary frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

[0088] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to a cyclic prefix (CP) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

[0089] 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.

[0090] 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 to control transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0091] The wireless transceiver 10 performs carrier sensing (LBT) before transmitting a signal to avoid signal collisions with other devices. The following types of LBT are used: Type 1: LBT that performs a random backoff process using a contention window with a variable size. Type 2A: LBT that does not perform a random backoff process and performs carrier sensing for 25 us before transmitting a signal. Type 2B: LBT that does not perform a random backoff process and performs carrier sensing for 16 us before transmitting a signal. Type 2C: LBT is not performed.

[0092] The wireless transceiver 10 transmits a signal after detecting that no other devices are transmitting (idle state) during listening, and does not transmit a signal when detecting that other devices are transmitting (busy state) during listening. The wireless transceiver 10 acquires a transmission opportunity and transmits when the LBT result is idle, and does not transmit when the LBT result is busy. The time of the transmission opportunity is called Channel Occupancy Time (COT). In LBT, the terminal device 1 monitors the channel before transmitting data, evaluates the idle channel, and transmits data only when it is confirmed that the channel is in an idle state.

[0093] When performing a random backoff process, the wireless transceiver unit 10 randomly generates a backoff counter value within the contention window size after the previous transmission. In random backoff, the terminal device 1 evaluates whether the channel is idle by detecting channel energy at each time interval using the random backoff counter. The wireless transceiver unit 10 waits until it confirms that the channel is idle for a certain period of time and performs carrier sensing (sensing) at each sensing slot time. If the carrier sensing result indicates that the channel is idle, the wireless transceiver unit 10 decrements the backoff counter value. If the carrier sensing result indicates that the channel is busy, the wireless transceiver unit 10 maintains the backoff counter value and waits until it confirms that the channel is idle for a certain period of time, and then performs carrier sensing. After repeating the above operations, the wireless transceiver unit 10 obtains access to the channel and can start transmitting signals on that channel after the backoff counter value reaches zero.

[0094] When HARQ-ACK feedback is applied to the sidelink, the radio transceiver unit 10 updates the contention window size based on the HARQ-ACK status. If the HARQ-ACK status is ACK, the radio transceiver unit 10 sets the contention window size to the minimum value. If the HARQ-ACK status is NACK, the radio transceiver unit 10 sets the contention window size to the next largest value. If the contention window size reaches the maximum configurable value, the radio transceiver unit 10 continues to use the maximum value even if the HARQ-ACK status is NACK. If the maximum contention window size has been used a predetermined number of times in succession, the radio transceiver unit 10 may set (or reset) the contention window size to the minimum value. The predetermined number of times may be set by the base station device 3 to the terminal device 1.

[0095] The initial value of the random backoff counter may be an integer between 0 and the contention window size. Before the random backoff counter is initialized, the contention window size is adjusted to control the average time required for the terminal device 1 to access the channel.

[0096] Before transmitting on the channel, the terminal device 1 performs listen-before-talk (LBT) on the channel. The terminal device 1 may adjust the time interval (amount of time) for performing the LBT. The terminal device 1 may select a random number between zero and the contention window size. If the channel is free for at least the time interval associated with the selected random number, the terminal device 1 may obtain a transmission opportunity and perform the transmission.

[0097] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0098] 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of the present 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 transmitter, a receiver, or a physical layer processing unit.

[0099] The upper layer processing unit 34 processes the Medium Access Control (MAC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Radio Resource Control (RRC) layer. Here, the MAC layer is also referred to as the MAC sublayer. The PDCP layer is also referred to as the PDCP sublayer. The RLC layer is also referred to as the RLC sublayer. The RRC layer is also referred to as the RRC sublayer.

[0100] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing, which may include part or all of the following: mapping between logical channels and transport channels, multiplexing one or more MAC SDUs (Service Data Units) into transport blocks, disassembling transport blocks delivered from the physical layer on the UL-SCH into one or more MAC SDUs, applying HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and processing of scheduling requests.

[0101] 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 broadcast signal management, RRC connection / RRC idle state management, and RRC reconfiguration. The radio resource control layer processing unit 36 ​​generates downlink data (transport blocks) to be allocated to the PDSCH, system information, RRC messages, MAC CEs, etc., or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

[0102] 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 higher layer signals. That is, the radio resource control layer processing unit 36 ​​transmits / broadcasts information indicating various setting information / parameters. The setting information may include information related to processing or setting of physical channels and physical signals (i.e., the physical layer), the MAC layer, the PDCP layer, the RLC layer, and the RRC layer. The parameters may be higher layer parameters. For example, the radio resource control layer processing unit 36 ​​may include the RRC parameters in an RRC message on a certain logical channel and transmit the RRC parameters to the terminal device 1. Here, the RRC message may be mapped to any of the BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel).

[0103] The radio resource control layer processing unit 36 ​​may determine RRC parameters to be transmitted to the terminal device 1 based on the RRC parameters included in the RRC message transmitted from the terminal device 1. Here, the RRC message transmitted from the terminal device 1 may be related to a capability information report of the terminal device 1.

[0104] 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.

[0105] The radio resource control layer processing unit 36 ​​sets a 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.

[0106] The radio resource control layer processing unit 36 ​​performs settings related to a plurality of search areas, each of which is indexed.

[0107] 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).

[0108] 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, etc. The radio resource control layer processing unit 36 ​​performs settings related to multiple CSI feedbacks. The settings related to multiple CSI feedbacks are each indexed.

[0109] The radio resource control layer processing unit 36 ​​performs SPS-related settings for the terminal device 1. The radio resource control layer processing unit 36 ​​sets the period of the SPS resources (PDSCH resources), the start timing (offset) of the SPS resources (PDSCH resources), the number of HARQ processes to be set for the SPS, an offset used to derive the HARQ process ID to be used for the SPS, an RNTI value for SPS scheduling, and the like. The radio resource control layer processing unit 36 ​​performs settings for multiple SPSs. The settings for multiple SPSs are each indexed.

[0110] 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 transceiver unit 30 to perform transmission processing for the terminal device 1 using the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 36 ​​controls the radio transceiver unit 30 to perform reception processing for the terminal device 1 using the uplink component carrier configured in the carrier aggregation configuration.

[0111] The radio resource control layer processing unit 36 ​​performs sidelink-related settings for the terminal device 1. The radio resource control layer processing unit 36 ​​sets parameters related to the sidelink 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 parameters related to the sidelink: Configuration of the sidelink BWP Configuration of the sidelink radio bearer Configuration of the sidelink measurement

[0112] The information indicating the configuration of the sidelink BWP includes information indicating the starting position of a symbol in a slot used for the sidelink, the length of the symbol, the PSBCH configuration, the configuration of the sidelink resource pool, etc. The information indicating the PSBCH configuration includes information indicating parameters used for PSBCH transmission power control. The information indicating the configuration of the sidelink resource pool includes information indicating the configuration of the sidelink reception resource pool, the configuration of the sidelink transmission resource pool, etc. The configuration of the sidelink transmission resource pool includes the configuration of the transmission resource pool for a method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1, and the configuration of the transmission resource pool for a method (mode 2) in which the terminal device 1 autonomously selects resources.

[0113] The information indicating the configuration of the sidelink resource pool 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 of 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 by 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, and information indicating the sidelink synchronization configuration.

[0114] Furthermore, the information indicating the configuration of the sidelink resource pool may include information indicating a slot configuration. It may include information indicating whether a slot configuration in which the PSCCH can be allocated to one symbol (OFDM symbol) within the slot is used or a slot configuration in which the PSCCH can be allocated to two symbols within the slot is used. In the slot configuration in which the PSCCH can be allocated to one symbol within the slot is used, it is configured in which of the first, second, third, fourth, fifth, sixth, or seventh symbols the PSCCH can be allocated. In a slot configuration in which there are two symbols in which the PSCCH can be arranged within the slot, the first symbol in which the PSCCH can be arranged is any one of the first, second, third, fourth, fifth, sixth, or seventh symbols, and the second symbol in which the PSCCH can be arranged is any one of the fourth, fifth, sixth, seventh, or eighth symbols. The information indicating the slot configuration may indicate a symbol in which an AGC signal can be arranged. The AGC signal may be arranged before the PSCCH.

[0115] The PSSCH is arranged in the OFDM symbol following the OFDM symbol in which the PSCCH is arranged. For example, if the PSCCH is arranged in the first symbol of a slot, the PSSCH is arranged in the second or subsequent symbols in the slot. For example, if the PSCCH is arranged in the eighth symbol of a slot, the PSSCH is arranged in the ninth or subsequent symbols in the slot.

[0116] 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.

[0117] The information indicating the configuration of the PSSCH includes information indicating candidates for β offsets used to determine the number of coded modulation symbols of 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 allocated to the 2nd stage SCI of the PSSCH.

[0118] The information indicating the PSFCH configuration includes information indicating a 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 PSFCH sequence hopping, information indicating a PSFCH resource interval, and information indicating a minimum time gap between the PSFCH and the PSFCH. For example, a bitmap is used as the information indicating the set of PRBs used for transmitting and receiving the PSFCH, and each bit indicates whether a PRB corresponding to the bit position is included in the set of PRBs used for transmitting and receiving the PSFCH. The information indicating the PSFCH resource interval is information indicating the interval of slots (PSFCH occasions) in which PSFCH resources are allocated. For example, information indicating an interval of one slot, an interval of two slots, or an interval of four slots is used.

[0119] The information indicating the PSFCH configuration includes information indicating a set of dedicated PRBs used for transmitting and receiving the PSFCH (PSFCH occasion). For example, when interlacing is used in an unlicensed band, information indicating the dedicated PRBs used for transmitting and receiving the PSFCH (PSFCH occasion) is included. The information indicating the set of dedicated PRBs used for the PSFCH occasion may be information indicating the start position (number of the starting dedicated PRB) and the number of dedicated PRBs used for the PSFCH occasion. The information indicating the set of dedicated PRBs used for the PSFCH occasion may be a bitmap consisting of a bit for each dedicated PRB. The information indicating the set of dedicated PRBs used for transmitting and receiving the PSFCH (PSFCH occasion) may be configured for each sidelink BWP or for each resource pool (transmission resource pool, reception resource pool).

[0120] The information indicating the set of dedicated PRBs used for the PSFCH occasion may include information indicating a symbol number (information indicating a symbol). The terminal device 1 determines that a dedicated PRB used for the PSFCH occasion is configured for the symbol with the indicated number.

[0121] The information indicating the configuration of the PSFCH includes information indicating the number of dedicated PRBs used for one PSFCH. One dedicated PRB or multiple dedicated PRBs are used for one PSFCH. The information indicating the number of dedicated PRBs used for one PSFCH may be configured for each resource pool (transmission resource pool, reception resource pool).

[0122] The information indicating the PSFCH configuration includes information indicating the number of PSFCH occasions corresponding to one PSCCH / PSSCH. The information indicating the PSFCH configuration may include information indicating the number of candidate PSFCH occasions corresponding to one PSCCH / PSSCH transmission. The information indicating the PSFCH configuration may include information indicating a plurality of dedicated PRBs for each of a plurality of candidate PSFCH occasions corresponding to one PSCCH / PSSCH transmission. The information indicating the PSFCH configuration may include information indicating a plurality of dedicated PRBs and symbols for each of a plurality of candidate PSFCH occasions corresponding to one PSCCH / PSSCH transmission.

[0123] The information indicating parameters for sidelink transmission power control includes information indicating parameters used for sidelink path loss-based transmission power control and information indicating parameters used for downlink path loss-based transmission power control.

[0124] 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 GNSS, 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 in one sidelink SSB period, information indicating the period and start 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.

[0125] 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 a method (mode 1) in which the base station device 3 instructs the terminal device 1 about scheduling information, information indicating the configuration for a method (mode 2) in which the terminal device 1 autonomously selects resources, information indicating whether CSI reporting is used, information indicating the configuration of a sidelink scheduling request, information indicating the priority of transmission and reception of 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.

[0126] 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, and the like.

[0127] The information indicating the configuration for the method (mode 1) in which the base station device 3 indicates scheduling information to the terminal device 1 includes information indicating an RNTI used to scramble the CRC of a DCI format (e.g., DCI format 3_0) including scheduling information for the terminal device 1, information indicating a sidelink MAC configuration, and information indicating a sidelink Configured Grant configuration. The information indicating the sidelink MAC configuration includes information indicating a sidelink BSR configuration and information indicating a threshold used to determine the priority of sidelink transmission and uplink transmission. The information indicating the sidelink Configured Grant configuration includes information indicating an ID for identifying the sidelink Configured Grant, information indicating frequency resources for the sidelink Configured Grant, information indicating time resources for the sidelink Configured Grant, information indicating a HARQ process ID for the sidelink Configured Grant, information indicating resources used for sidelink HARQ-ACK transmission, information indicating the duration of the sidelink Configured Grant, information indicating a resource pool to which the sidelink Configured Grant is applied, and information indicating the start subchannel of the sidelink Configured Grant.

[0128] The information indicating the configuration for the method (mode 2) in which the terminal device 1 autonomously (automatically) selects resources includes information indicating the transmission parameters of the PSSCH such as the MCS, subchannel number, number of retransmissions, and transmission power parameters, information indicating the probability of being used for resource selection, and information indicating the threshold value for the RSRP used for resource selection.

[0129] The parameters for the side link include information indicating the number of slots (multiple slots) used in one unit of transmission. The information indicating the parameters for the side link includes information indicating the number of consecutive slots. Instead of the number of slots, information indicating a time length, such as ms (milliseconds), may be included. In mode 2, information indicating the number of slots used in one unit of transmission is included. In mode 2, the terminal device 1 performs resource selection in units of the indicated number of slots. In mode 2, the terminal device 1 reserves resources in units of the indicated number of slots. The information indicating the number of slots used in one unit of transmission is used (set, configured) for each resource pool. A resource of multiple logically consecutive slots used in one unit of transmission is called a multiple slot resource (multiple resource unit).

[0130] The length of the consecutive slots corresponds to, for example, the maximum COT. For example, information indicating the number of slots corresponding to any of the consecutive slot lengths of 2 ms, 3 ms, 4 ms, 6 ms, 8 ms, and 10 ms is set for the resource pool. For example, any of 2 slots, 3 slots, 4 slots, 6 slots, 8 slots, and 10 slots is indicated as the number of slots used in one unit of transmission. The terminal device 1 may determine (interpret) the number of slots used in one unit of transmission based on the subcarrier spacing used from the information indicating the number of slots used in one unit of transmission.

[0131] For example, when the information indicating the number of slots used in one unit of transmission indicates two slots, the terminal device 1 selects and reserves resources in units of two slots. For example, the terminal device 1 selects resources for two slots and reserves two sets of resources for two different slots. For example, the terminal device 1 selects resources for two slots and reserves one set of resources for two different slots. For example, when the information indicating the number of slots used in one unit of transmission indicates three slots, the terminal device 1 selects and reserves resources in units of three slots. For example, the terminal device 1 selects resources for three slots and reserves two sets of resources for three different slots. For example, the terminal device 1 selects resources for three slots and reserves one set of resources for three different slots. For example, when the information indicating the number of slots used in one unit of transmission indicates four slots, the terminal device 1 selects and reserves resources in units of four slots. For example, the terminal device 1 selects resources for four slots and reserves two sets of resources for four different slots. For example, the terminal device 1 selects a certain four-slot resource and reserves one set of resources of different four slots. For example, if the information indicating the number of slots used in one unit of transmission indicates six slots, the terminal device 1 performs resource selection and resource reservation in units of six slots. For example, the terminal device 1 selects a certain six-slot resource and reserves two sets of resources of different six slots. For example, the terminal device 1 selects a certain six-slot resource and reserves one set of resources of different six slots. For example, if the information indicating the number of slots used in one unit of transmission indicates eight slots, the terminal device 1 performs resource selection and resource reservation in units of eight slots. For example, the terminal device 1 selects a certain eight-slot resource and reserves two sets of resources of different eight slots. For example, the terminal device 1 selects a certain eight-slot resource and reserves one set of resources of different eight slots. For example, if the information indicating the number of slots used in one unit of transmission indicates ten slots, the terminal device 1 performs resource selection and resource reservation in units of ten slots. For example, terminal device 1 selects a certain 10-slot resource and reserves two different sets of 10-slot resources.For example, terminal device 1 selects a certain set of 10 slots of resources and reserves a set of different 10 slots of resources.

[0132] A time interval (resource reservation period) between an initially selected set of resources and a next reserved set of resources is set for each resource pool. The base station device 3 transmits RRC signaling including a parameter indicating this time interval to the terminal device 1. The terminal device 1 receives RRC signaling including a parameter indicating this time interval from the base station device 3. This time interval is also used as the time interval between the reserved resource sets.

[0133] The terminal device 1 may select a channel access priority class according to the priority of data to be transmitted, determine the maximum COT used in the selected channel access priority class, select a resource pool in which the number of slots used in one unit of transmission set for the resource pool corresponds to the maximum COT, and select and reserve resources in units of multiple slots.A plurality of resource pools are configured for the terminal device 1, and different numbers of consecutive slots are set for each of the configured resource pools as slots used in one unit of transmission in mode 2.

[0134] A configuration may be adopted in which, instead of information indicating the number of slots used in one unit of transmission in mode 2 being included in the parameters related to the side link, the channel access priority class for the resource pool is included in the parameters. The number of slots used in one unit of transmission for each channel access priority class may be predefined, and the number of slots used in one unit of transmission set for each resource pool may be implicitly notified from the base station device 3 to the terminal device 1. The terminal device 1 recognizes the number of slots used in one unit of transmission in mode 2 in that resource pool from the channel access priority class set for that resource pool.

[0135] In mode 1, multiple slot resources may also be used.

[0136] In single-slot resource allocation, a guard time (also called a gap) is provided in the last time interval of the slot. Transmit and receive modes switch during the guard time. In multiple-slot resource allocation, guard times are not provided in some slots. Alternatively, in multiple-slot resource allocation, a short guard time (16 μs or less) during which LBT is not required may be provided in some slots. For example, when two consecutive slots are used as multiple-slot resources, no guard time is provided in the last time interval of the first slot. For example, when three consecutive slots are used as multiple-slot resources, no guard time is provided in the last time interval of the first and second slots. For example, when four consecutive slots are used as multiple-slot resources, no guard time is provided in the last time interval of the first, second, and third slots. For example, when six consecutive slots are used as multiple-slot resources, no guard time is provided in the last time interval of the first, second, third, fourth, and fifth slots. For example, when a resource of eight consecutive slots is used as a multiple slot resource, no guard time is provided in the last time interval of each of the first, second, third, fourth, fifth, sixth, and seventh slots. For example, when a resource of ten consecutive slots is used as a multiple slot resource, no guard time is provided in the last time interval of each of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth slots.

[0137] The terminal device 1 transmits one channel or multiple channels in multiple consecutive slots. For example, the terminal device 1 transmits one PSSCH spanning multiple slots. Note that a different transport block is transmitted in each slot. For example, the terminal device 1 transmits a different PSSCH in each of multiple slots. For example, the terminal device 1 transmits a different PSCCH in each of multiple slots. Note that in this case, the PSCCH in each slot corresponds to the PSSCH in that slot. Note that when one PSSCH is transmitted across multiple slots, the corresponding PSCCH may be transmitted only in the first slot of the multiple consecutive slots. The PSSCH includes information indicating the number of slots used in one unit of transmission. Alternatively, the PSCCH includes information indicating the number of remaining slots (the number of remaining slots belonging to a multiple resource unit) in the multiple slots from which resources are selected.

[0138] The terminal device 1 recognizes resources (resources of multiple consecutive slots) secured in other terminal devices 1 from information included in the received PSCCH (information of 1st SCI), excludes those resources, and selects and reserves resources to be used by the terminal device 1 from resources that have not been recognized as being secured in other terminal devices 1. The terminal device 1 may recognize resources (resources of multiple consecutive slots) secured or reserved in other terminal devices 1 from information of 2nd SCI included in the received PSSCH.

[0139] In this way, by terminal device 1 selecting and reserving resources in units of multiple consecutive slots corresponding to the maximum COT, the number of LBTs can be reduced, and efficient mode 2 operation can be achieved. If resources are selected and reserved in slot units and there is a time gap between slots (a gap of 16 μs or more), terminal device 1 must perform an LBT before transmitting each slot. If the LBT fails, terminal device 1 cannot transmit, and an increase in the number of LBTs leads to an increase in the number of LBT failures, and therefore an increase in the number of times terminal device 1 cannot transmit. By using multiple-slot resources, the number of LBTs can be reduced, and efficient operation can be achieved.

[0140] Information indicating the number of slots used in one unit of transmission may not be notified from the base station device 3 to the terminal device 1 as a parameter related to the side link, but may be pre-configured for resource pools having different numbers of slots used in one unit of transmission. For example, a resource pool in which the number of slots used in one unit of transmission is pre-configured may be used between out-of-coverage terminal devices 1. For example, a resource pool in which the number of slots used in one unit of transmission in Mode 2 is two may be pre-configured. For example, a resource pool in which the number of slots used in one unit of transmission in Mode 2 is three may be pre-configured. For example, a resource pool in which the number of slots used in one unit of transmission in Mode 2 is four may be pre-configured. For example, a resource pool in which the number of slots used in one unit of transmission in Mode 2 is six may be pre-configured. For example, a resource pool in which the number of slots used in one unit of transmission in Mode 2 is eight may be pre-configured. For example, a resource pool in which the number of slots used in one unit of transmission in Mode 2 is ten may be pre-configured. The terminal device 1 selects a resource pool according to the priority of the data to be transmitted, and selects and reserves resources in units of multiple slots.

[0141] 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 HARQ feedback is applied 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.

[0142] The information indicating the configuration of the sidelink measurements includes information indicating the frequency at which the sidelink measurements are performed, information indicating the filter coefficients applied to the sidelink measurements, 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.

[0143] The sidelink RRC signaling includes information indicating a delay time limit for sidelink CSI reporting, which indicates a limit of the delay time from triggering of sidelink CSI to reporting in slot units.

[0144] 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 initial 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 the subcarrier on which the CSI-RS is allocated for each antenna port.

[0145] The terminal device 1 receives the above-mentioned RRC signaling (RRC parameters). A radio resource control layer processing unit 16 of the terminal device 1 manages information included in the RRC signaling, sets various parameters, and controls the processing of each unit.

[0146] The terminal device 1 notifies the base station device 3 of information related to the sidelink by RRC signaling. The information includes information indicating frequencies at which the terminal device 1 is interested in receiving sidelink communications, information indicating 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 a cast type (broadcast, groupcast, unicast) for requesting sidelink resources, information indicating Destination Identity, information about sidelink QoS, information indicating an RLC mode, information indicating a list of synchronization references used by the terminal device 1, and the like.

[0147] The information on sidelink capability includes information indicating the number of PSFCHs that can be simultaneously transmitted and information indicating the number of PSFCHs that can be simultaneously received. For example, the information indicating the number of PSFCHs that can be simultaneously transmitted indicates any one of 4, 8, and 16. For example, the information indicating the number of PSFCHs that can be simultaneously received indicates any one of 5, 15, 25, 32, 35, 45, 50, and 64.

[0148] The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs (SCell Activation / Deactivation MAC CEs) that instruct activation / deactivation of secondary cells. The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs that instruct activation / deactivation of secondary cells for multiple serving cells configured by the radio resource control layer processing unit 36. The medium access control layer processing unit (MAC layer processing unit) 35 deactivates secondary cells based on a timer. The medium access control layer processing unit (MAC layer processing unit) 35 determines that scheduling has not been performed for a serving cell for a certain period of time by measuring with the timer, deactivates the serving cell, and controls the radio transceiver unit 30.

[0149] The functions of the radio transceiver unit 30 are similar to those of the radio transceiver unit 10, and therefore description thereof will be omitted where appropriate. The radio transceiver unit 30 performs physical layer processing. Here, the physical layer processing may include some or all of the following: generation of a baseband signal of a physical channel, generation of a baseband signal of 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 mapping processing of a transport channel to a physical channel. Here, the baseband signal is also referred to as a time-continuous signal.

[0150] The radio transceiver 30 may perform one or both of demodulation and decoding. The radio transceiver 30 may deliver a transport block of information detected based on the demodulation and decoding of a received physical signal to a higher layer on the UL-SCH. For example, the radio 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 allocated to the downlink physical channel. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical signal.

[0151] The radio transceiver unit 30 may perform some or all of modulation processing, coding processing, and transmission processing. The radio transceiver unit 30 may generate a physical signal based on some or all of coding processing, modulation processing, and baseband signal generation processing for the transport block. The radio transceiver unit 30 may map the physical signal to a BWP. The radio transceiver unit 30 may transmit the generated physical signal. For example, the radio transceiver unit 30 may attempt to detect information transmitted by an uplink physical channel. Here, the transport block of the information transmitted by the uplink physical channel may be delivered to a higher layer on the UL-SCH. For example, the radio transceiver unit 30 may attempt to detect information transmitted by an uplink physical signal.

[0152] The radio transceiver unit 30 grasps the SS (Search space) configured in the terminal device 1. The radio transceiver unit 30 grasps the search space within the control resource set configured in the terminal device 1. The radio transceiver unit 30 grasps the PDCCH candidates monitored in the terminal device 1 to grasp the search space. The radio transceiver unit 30 grasps which control channel elements constitute each PDCCH candidate monitored in the terminal device 1 (grabs the numbers of the control channel elements in which the PDCCH candidate is constituted). The radio transceiver unit 30 includes an SS grasping unit, which grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates in 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 numbers of the PDCCH candidates) configured in the search space of the control resource set of the terminal device 1.

[0153] The SS ascertaining unit ascertains the configuration of the search space within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the radio transceiver unit 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidates within the search space of the control resource set.

[0154] A transmitter (also referred to as a transmission processing unit) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search space set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates in a search space where PDCCH monitoring is performed in the terminal device 1, among multiple search spaces set for the terminal device 1.

[0155] The receiving unit (also referred to as the receiving processing unit) of the base station device 3 receives the HARQ-ACK. The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH. The receiving processing unit of the base station device 3 receives the HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3.

[0156] A receiving unit of the base station device 3 receives the sidelink HARQ-ACK from the terminal device 1. The terminal device 1 transmits information about the sidelink HARQ-ACK acquired from the PSFCH received from the terminal device 1, which is the communication partner, via the sidelink, to the base station device 3 using the PUCCH.

[0157] The radio transceiver unit 30 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver unit 30 stops transmitting the PDCCH in the deactivated serving cell. For example, the radio transceiver unit 30 stops transmitting the PDSCH in the deactivated serving cell. For example, the radio transceiver unit 30 stops receiving the SRS in the deactivated serving cell. For example, the radio transceiver unit 30 stops receiving the PUSCH in the deactivated serving cell.

[0158] 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.

[0159] The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove a portion corresponding to a cyclic prefix (CP) from the digitized baseband signal. The baseband unit 33 may perform a fast Fourier transform (FFT) on the baseband signal from which the CP has been removed to extract a frequency domain signal.

[0160] 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 analog baseband signal to the RF unit 32.

[0161] 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 transmission power.

[0162] Each of the units designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0163] Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described.

[0164] The physical signal is a general term for a downlink physical channel, a downlink physical signal, an uplink physical channel, and an uplink physical channel. The physical channel is a general term for a downlink physical channel and an uplink physical channel. The physical signal is a general term for a downlink physical signal and an uplink physical signal.

[0165] An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in an uplink component carrier. An uplink physical channel may be transmitted by the radio transceiver unit 10. An 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)

[0166] The PUCCH may be used to transmit (transmit) uplink control information (UCI). The uplink control information may be arranged in the PUCCH. The radio transceiver 10 may transmit the PUCCH in which the uplink control information is arranged. The radio transceiver 30 may receive the PUCCH in which the uplink control information is arranged.

[0167] The uplink control information (uplink control information bits, uplink control information sequence, uplink control information type) includes some or all of channel state information (CSI), scheduling request (SR), and hybrid automatic repeat request ACKnowledgement (HARQ-ACK) information. Note that the uplink control information may also include information not described above.

[0168] The channel state information is also referred to as a channel state information bit or a channel state information sequence. The scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0169] The HARQ-ACK information may be configured by 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 transport block has been decoded successfully. The NACK may indicate that the transport block has not been decoded successfully. The HARQ-ACK information may include one or more HARQ-ACK bits.

[0170] The HARQ-ACK for a transport block is also referred to as the HARQ-ACK for a PDSCH. Here, the "HARQ-ACK for a PDSCH" may refer to the HARQ-ACK for a transport block included in the PDSCH.

[0171] The scheduling request may be used to request UL-SCH resources for initial transmission. The scheduling request bit may be used to indicate either a positive SR or a negative SR. When the scheduling request bit indicates a positive SR, this is also referred to as "a positive SR is transmitted (communicated)." A positive SR may indicate that UL-SCH resources for initial transmission are requested by the terminal device 1. When the scheduling request bit indicates a negative SR, this is also referred to as "a negative SR is transmitted (communicated)." A negative SR may indicate that UL-SCH resources for initial transmission are not requested by the terminal device 1.

[0172] The channel state information may include some or all of a Channel Quality Indicator (CQI), a Precoder Matrix Indicator (PMI), and a Rank Indicator (RI). The CQI is an indicator related to the quality of the propagation path (e.g., propagation strength) or the quality of the physical channel, the PMI is an indicator related to the precoder, and the RI is an indicator related to the transmission rank (or the number of transmission layers).

[0173] The channel state information is an indicator related to the reception state of a physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel state information may be determined by the terminal device 1 based on the reception state assumed by the physical signal used for channel measurement. The channel measurement may include interference measurement.

[0174] The PUCCH may have a PUCCH format, where the PUCCH format may be a format of physical layer processing of the PUCCH, or a format of information transmitted using the PUCCH.

[0175] The PUSCH may be transmitted to convey one or both of uplink control information and a transport block. The PUSCH may be used to convey one or both of uplink control information and a transport block. The PUSCH may be used to transmit at least some or all of the transport block, HARQ-ACK, channel state information, and a scheduling request. The PUSCH is used at least to transmit a random access message 3. The PUSCH may be used to transmit information not described above. The terminal device 1 may transmit a PUSCH in which one or both of uplink control information and a transport block are allocated. The base station device 3 may receive a PUSCH in which one or both of uplink control information and a transport block are allocated.

[0176] The PRACH may be transmitted to convey an index of the random access preamble (random access message 1). The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit the random access preamble on the PRACH. The base station device 3 may receive the random access preamble on the PRACH.

[0177] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal does not have to be used to transmit information generated in a higher layer. The uplink physical signal may be used to transmit information generated in the 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)

[0178] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0179] A set of antenna ports for DMRSs for a PUSCH (DMRSs associated with a PUSCH, DMRSs included in a PUSCH, and DMRSs corresponding to a PUSCH) may be given based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for DMRSs for a PUSCH may be the same as the set of antenna ports for the PUSCH.

[0180] The propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0181] 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.

[0182] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0183] The downlink physical channel may correspond to a set of resource elements that transmit 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)

[0184] The PBCH is transmitted to carry Master Information Blocks (MIBs) and / or physical layer control information (PLIC), which is information generated in the physical layer. MIBs are RRC messages delivered from higher layers on the Broadcast Control Channel (BCCH).

[0185] The PDCCH is used at least for transmitting (transmitting) downlink control information (DCI). The downlink control information may be allocated to the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is allocated. The base station device 3 may transmit the PDCCH in which the downlink control information is allocated.

[0186] 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 in a certain downlink control information format.

[0187] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. Here, the terminal device 1 may monitor the PDCCH to acquire the downlink control information. Unless otherwise specified, the DCI format and the downlink control information may be described as equivalent. For example, the base station device 3 may include the downlink control information in a DCI format and transmit it to the terminal device 1. Furthermore, the terminal device 1 may control the radio transceiver unit 10 using the downlink control information included in the detected DCI format.

[0188] The downlink control information may include at least one of a downlink grant (DL grant) or an uplink grant (UL grant). A DCI format used for scheduling the PDSCH is also referred to as a downlink DCI format. A DCI format used for scheduling the PUSCH is also referred to as an uplink DCI format. A downlink grant is also referred to as a downlink assignment (DL assignment) or a downlink allocation (DL allocation).

[0189] DCI formats include DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format 1_1. The uplink DCI format is a general term for DCI format 0_0, DCI format 0_1, etc. The downlink DCI format is a general term for DCI format 1_0, DCI format 1_1, etc.

[0190] The uplink DCI format is used for scheduling the PUSCH allocated to a certain cell. The uplink DCI format includes at least some or all of 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) 1F) CSI request field

[0191] The DCI format identification field may indicate whether the DCI format including the DCI format identification field is an uplink DCI format or a downlink DCI format. That is, the DCI format identification field may be included in both the uplink DCI format and the downlink DCI format. Here, the DCI format identification field included in the uplink DCI format may indicate 0.

[0192] The frequency domain resource allocation field included in the uplink DCI format may be used to indicate the allocation of frequency resources for the PUSCH scheduled by the uplink DCI format.

[0193] The time domain resource allocation field included in the uplink DCI format may be used to indicate the allocation of time resources for the PUSCH scheduled by the uplink DCI format.

[0194] The frequency hopping flag field may be used to indicate whether frequency hopping is applied to the PUSCH scheduled by the uplink DCI format.

[0195] The MCS field included in an uplink DCI format may be used to indicate one or both of a modulation scheme for a PUSCH scheduled by the uplink DCI format and a target coding rate scheduled by the uplink DCI format. The target coding rate may be a target coding rate for a transport block assigned to the PUSCH. The size of the transport block (TBS) assigned to the PUSCH may be determined based on part or all of the target coding rate and the modulation scheme for the PUSCH.

[0196] The CSI request field may be used to indicate the reporting of CSI.

[0197] The downlink DCI format is used for scheduling the PDSCH allocated to a certain cell. The downlink DCI format includes some or all of 3A to 3F. 2A) DCI format specific field 2B) Frequency domain resource allocation field 2C) Time domain resource allocation field 2D) MCS field 2E) PDSCH to HARQ feedback timing indicator field 2F) PUCCH resource indicator field

[0198] The DCI format specific field included in the downlink DCI format may indicate 1.

[0199] The frequency domain resource allocation field included in the downlink DCI format may be used to indicate the allocation of frequency resources for the PDSCH scheduled by the DCI format.

[0200] The time domain resource allocation field included in the downlink DCI format may be used to indicate the allocation of time resources for the PDSCH scheduled by the DCI format.

[0201] The MCS field included in a downlink DCI format may be used to indicate one or both of a modulation scheme for a PDSCH scheduled by the DCI format and a target coding rate for the PDSCH scheduled by the DCI format. The target coding rate may be a target coding rate for a transport block allocated to the PDSCH. The size of the transport block (TBS) allocated to the PDSCH may be determined based on one or both of the target coding rate and the modulation scheme for the PDSCH.

[0202] The PDSCH_HARQ feedback timing indication field may be used to indicate an offset from the slot containing the last OFDM symbol of the PDSCH to the slot containing the first OFDM symbol of the PUCCH. The PDSCH to HARQ feedback timing indication field may be a field indicating timing K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the PUCCH or PUSCH containing at least a HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH containing at least a HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1.

[0203] The PDSCH_HARQ feedback timing indication field may also be referred to as a PDSCH-to-HARQ feedback timing indicator field or a HARQ indication field.

[0204] The PUCCH resource indication field may be used to indicate the resource of the PUCCH.

[0205] A downlink grant is used for scheduling at least one PDSCH in one serving cell. The downlink grant is used for scheduling at least one PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling a PDSCH in a slot different from the slot in which the downlink grant is transmitted. The uplink grant is used for scheduling at least one PUSCH in one serving cell.

[0206] Note that various DCI formats may further include fields different from the above-mentioned fields.

[0207] The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block. The transport block may be allocated to the PDSCH. The base station device 3 may transmit the PDSCH in which the transport block is allocated. The terminal device 1 may receive the PDSCH in which the transport block is allocated.

[0208] The downlink physical signal may correspond to a set of resource elements. The downlink physical signal does not have to be used to transmit information generated in a higher layer. The downlink physical signal may be used to transmit information generated in a physical layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The radio transceiver unit 10 may receive the downlink physical signal. The radio transceiver unit 30 may transmit the downlink physical signal. In the downlink of the radio 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)

[0209] The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and / or the time domain of the downlink. The synchronization signal is a general term for a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

[0210] An SS block (SS / PBCH block) is composed of at least a PSS, an SSS, and some or all of the PBCH.

[0211] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0212] The PBCH on which the PBCH symbol is transmitted at a certain antenna port may be estimated by the DMRS for the PBCH that is placed in the slot to which the PBCH is mapped and is included in the SS / PBCH block to which the PBCH belongs.

[0213] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0214] A set of antenna ports for a DMRS for a PDSCH (a DMRS associated with a PDSCH, a DMRS included in a PDSCH, or a DMRS corresponding to a PDSCH) may be determined based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0215] A propagation path of a PDSCH may be estimated from a DMRS for the PDSCH. If a set of resource elements carrying a certain PDSCH symbol and a set of resource elements carrying a DMRS symbol for the PDSCH are included in the same precoding resource group (PRG), the PDSCH carrying the PDSCH symbol for a certain antenna port may be estimated by the DMRS for the PDSCH.

[0216] The antenna port of the DMRS for the PDCCH (DMRS related to the PDCCH, DMRS included in the PDCCH, DMRS corresponding to the PDCCH) may be the same as the antenna port for the PDCCH.

[0217] The propagation path of a PDCCH may be estimated from the DMRS for the PDCCH. If the same precoder is applied (or assumed to be applied) to a set of resource elements on which a certain PDCCH symbol is transmitted and a set of resource elements on which a DMRS symbol for the PDCCH is transmitted, the PDCCH on which the PDCCH symbol for a certain antenna port is transmitted may be estimated by the DMRS for the PDCCH.

[0218] The BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel), and DL-SCH (Downlink-Shared CHannel) are transport channels.

[0219] The BCH of the transport layer may be mapped to the PBCH of the physical layer, i.e., the transport block delivered from higher layers on the BCH of the transport layer may be placed on the PBCH of the physical layer, and the UL-SCH of the transport layer may be mapped to the PUSCH of the physical layer.

[0220] The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

[0221] The BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH may be used to deliver an RRC message including an MIB or an RRC message including system information. The CCCH may also be used to transmit an RRC message including RRC parameters common to multiple terminal devices 1. Here, the CCCH may be used, for example, for terminal devices 1 that are not RRC connected. The DCCH may also be used to transmit an RRC message dedicated to a certain terminal device 1. Here, the DCCH may be used, for example, for terminal devices 1 that are RRC connected.

[0222] The BCCH may be mapped to the BCH or DL-SCH. That is, an RRC message containing MIB information may be delivered on the BCH. An RRC message containing system information other than MIB information may be delivered on the DL-SCH. The CCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the CCCH may be delivered on the DL-SCH or UL-SCH. The DCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the DCCH may be delivered on the DL-SCH or UL-SCH.

[0223] The UL-SCH may be mapped to the PUSCH, the DL-SCH may be mapped to the PDSCH, and the BCH may be mapped to the PBCH.

[0224] The medium access control layer processing unit 15 may implement a random access procedure.

[0225] For example, downlink control information including a downlink grant or an uplink grant is transmitted and received on a PDCCH, including a C-RNTI (Cell-Radio Network Temporary Identifier).

[0226] One physical channel may be mapped to one serving cell, and one physical channel may be mapped to one BWP configured on one carrier included in one serving cell.

[0227] One or more control resource sets (CORESETs) may be configured in the terminal device 1. 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 sets of PDCCH candidates. Furthermore, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or a DCI format transmitted via the PDCCH.

[0228] A plurality of control resource sets may be configured in the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

[0229] A set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space. That is, the set of PDCCH candidates monitored by the terminal device 1 is given by the search space.

[0230] The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidates may indicate the number of CCEs constituting the PDCCH. The PDCCH candidates may be mapped to one or more CCEs.

[0231] The search area set may be configured to include at least one or more search areas, and an index (search area index) may be assigned to each search area.

[0232] Each search space set may be associated with at least one control resource set, each search space set may be included in one control resource set, and each search space set may be given an index of the control resource set associated with that search space set.

[0233] The terminal device 1 can detect the PDCCH and / or DCI for the terminal device 1 by blindly detecting PDCCH candidates included in the search space within the control resource set.

[0234] In various aspects of the present embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

[0235] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto a PUCCH and transmit the same. The terminal device 1 may multiplex the UCI onto a PUSCH and transmit the same. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0236] 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.

[0237] If data is successfully decoded, an ACK is generated for the data. If 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 multiple 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 multiple transport blocks may correspond to a PDSCH including the one or multiple transport blocks.

[0238] HARQ control for one transport block may be referred to as an HARQ process. One HARQ process identifier may be assigned to each HARQ process. The DCI format includes a field indicating the HARQ process identifier (HARQ process number).

[0239] 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) including 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 NDI value that is not updated in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format for the HARQ process corresponding to the value of the HARQ process identifier field of the detected DCI format.

[0240] The terminal device 1 determines whether a received transport block is a new transmission or a retransmission based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is toggled, determines that the received transport block is a new transmission. When transmitting a transport block for a new transmission in a certain HARQ process, the base station device 3 toggles the NDI value stored for the HARQ process and transmits the toggled NDI to the terminal device 1. When transmitting a transport block for a retransmission in a certain HARQ process, the base station device 3 does not toggle the NDI value stored for the HARQ process and transmits an untoggled NDI to the terminal device 1. The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is not toggled (they are the same), determines that the received transport block is a retransmission. Note that toggling here means switching to a different value.

[0241] The term "physical signal" is also a general term for the sidelink physical channel and the sidelink physical signal. The term "physical channel" is also a general term for the sidelink physical channel. The term "physical signal" is also a general term for the sidelink physical signal.

[0242] 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 the 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), and PSFCH (Physical Sidelink Feedback CHannel).

[0243] 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).

[0244] The PSCCH is used at least for transmitting (transmitting) sidelink control information (SCI). The sidelink control information may be arranged in the PSCCH. The terminal device 1 may receive the PSCCH in which the sidelink control information is arranged. The terminal device 1 may transmit the PSCCH in which the sidelink control information is arranged.

[0245] The sidelink control information is transmitted and received in the sidelink control information format (SCI format). The SCI transmitted and received on the PSCCH is st stage SCI (1 st The SCI transmitted and received on the PSSCH is called the SCI format. nd stage SCI (2 ndThis is called the SCI format. 1 st The stage SCI format may include SCI format 1-A. SCI format 1-A is a combination of PSSCH and 2 nd Used for scheduling of stage SCI. SCI format 1-A has a field indicating priority, a field indicating frequency resource allocation, a field indicating time resource allocation, a field indicating resource reservation interval, a field indicating DM RS pattern, and 2 nd A field indicating the stage SCI format (SCI format 2-A, SCI format 2-B), a beta offset (2 nd It includes a field indicating the number of DM RS ports, a field indicating the MCS, a field indicating the MCS table, and a field containing a PSFCH overhead indication.

[0246] 2 nd The stage SCI is used for decoding the PSSCH. SCI format 2-A contains the 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 contains the HARQ process number, NDI, RV, Source ID, Destination ID, HARQ feedback enable / disable indicator, Zone ID, and communication range request information.

[0247] PSSCH transmits sidelink data (sidelink transport blocks, sidelink PDUs), 2 nd The PSSCH may be transmitted to carry sidelink data, 2 nd The terminal device 1 may transmit sidelink data, 2 ndThe terminal device 1 may transmit the sidelink data, 2, and the PSSCH in which the stage SCI is arranged. nd A PSSCH in which a stage SCI is arranged may be received.

[0248] The PSFCH is used to transmit HARQ-ACK information corresponding to PSSCH reception. The terminal device 1 transmits the PSFCH in which the HARQ-ACK information is arranged. The terminal device 1 receives the PSFCH in which the HARQ-ACK information is arranged.

[0249] The terminal device 1 is instructed in an SCI format to transmit a PSFCH including HARQ-ACK information in response to PSSCH reception. The terminal device 1 transmits the PSFCH in the first slot including a PSFCH resource after a set gap from the last slot of PSSCH reception. PSFCH resources (individual PRBs) are associated with PSSCH subchannels and PSSCH slots. For example, the PSSCH in the smallest-numbered subchannel and the smallest-numbered slot may be associated with the smallest-numbered PSFCH resource, and then the PSSCH in the smallest-numbered subchannel and the second smallest-numbered slot may be associated with the second smallest-numbered PSFCH resource. That is, first, PSSCH and PSFCH resources may be associated in the slot direction. Next, PSSCH and PSFCH resources may be associated in the subchannel direction. PSSCH subchannels and PSSCH slots may be associated in units of sets of multiple individual PRBs configured for PSFCH occasions.

[0250] The PSFCH for transmitting and receiving HARQ-ACK information may further be configured from a cyclic shift pair. The terminal device 1 may determine a PSFCH resource to use from multiple PSFCH resources configured from the same dedicated PRB (resource block) and configured from different cyclic shift pairs, based on a physical layer source ID provided by the 2nd SCI format that schedules PSSCH reception. The terminal device 1 may determine a cyclic shift value from the cyclic shift pair.

[0251] When multiple PSFCH occasions are configured for one PSCCH / PSSCH, PSSCH resources are associated with the sets of dedicated PRBs configured for each PSFCH occasion. The terminal device 1 attempts to transmit the PSFCH at the PSFCH occasion of the slot in which the first PSFCH occasion is configured, after a configured gap from the last slot of PSSCH reception. If an LBT failure occurs, the terminal device 1 does not transmit the PSFCH at that PSFCH occasion, and attempts to transmit the PSFCH at the PSFCH occasion of the next slot in which a PSFCH occasion is configured. If an LBT failure continues during the PSFCH occasion, transmission of the PSFCH including the HARQ-ACK of the received PSSCH is attempted up to the number of PSFCH occasions configured for one PSCCH / PSSCH. When transmitting the PSFCH for one PSCCH / PSSCH, the terminal device 1 determines the dedicated PRB to be used for transmitting the PSFCH from different dedicated PRB sets in the PSFCH occasions of different slots.

[0252] When multiple PSFCH occasions are configured for one PSCCH / PSSCH, a set of individual PRBs configured for each PSFCH occasion is associated with PSSCH resources. The terminal device 1 attempts to transmit the PSFCH in the PSFCH occasion of the slot in which the first PSFCH occasion is configured, after a set gap from the last slot of PSSCH reception. The terminal device 1 may experience simultaneous PSFCH transmissions, making it impossible to transmit some PSFCHs. For PSFCHs that could not be transmitted, the terminal device 1 attempts to transmit the PSFCH that could not be transmitted in the PSFCH occasion of the slot in which the next PSFCH occasion is configured. If simultaneous PSFCH transmissions continue to occur and it continues to be impossible to transmit a PSFCH with a lower priority, the terminal device 1 attempts to transmit the PSFCH including the HARQ-ACK of the received PSSCH up to the number of PSFCH occasions configured for one PSCCH / PSSCH. When transmitting a PSFCH for one PSCCH / PSSCH, the terminal device 1 determines a dedicated PRB to be used for transmitting the PSFCH from different dedicated PRB sets in PSFCH occasions of different slots.

[0253] The PSFCH is composed of common resources (common interlaces) that are resources common to multiple terminal devices 1 and / or dedicated resources (dedicated PRBs) that are resources individual to a terminal device 1. For example, multiple terminal devices 1 configured with the same sidelink BWP or the same resource pool use the same common resources. A signal generated from HARQ-ACK information is allocated to the dedicated resources. A signal not generated from HARQ-ACK information is allocated to the common resources. In a licensed band, only dedicated resources may be used for the PSFCH. In an unlicensed band, only dedicated resources, or dedicated resources and common resources may be used for the PSFCH.

[0254] One dedicated resource is composed of, for example, one physical resource block (resource block). One common resource is composed of multiple physical resource blocks (interlaces) distributed within the channel band (LBT band). One dedicated resource or multiple dedicated resources are used for one PSFCH. The dedicated resources are implicitly or explicitly indicated to the terminal device 1. For example, the resource (individual PRB number, cyclic shift pair) of the dedicated resource is determined based at least on the index of the subchannel in which the PSCCH and PSSCH are configured. For example, the resource (individual PRB number, cyclic shift pair) of the dedicated resource is determined based at least on the index of the subchannel in which the PSSCH is configured. For example, the resource (individual PRB number, cyclic shift pair) of the dedicated resource is determined based at least on the index of the slot in which the PSSCH is allocated. For example, 1 st The individual resource (individual PRB number, cyclic shift pair) is specified in the stage SCI. For example, 2 nd The dedicated resource resources (dedicated PRB numbers and cyclic shift pairs) are indicated in the stage SCI. The common resource resources are pre-configured. The common resource is configured, for example, to a sidelink BWP or a specific interlace in a resource pool (e.g., the interlace with the smallest interlace index).

[0255] The sidelink physical signal may correspond to a set of resource elements. The sidelink physical signal does not have to be used to transmit information generated in a higher layer. The sidelink physical signal may be used to transmit 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), Sidelink DM RS, Sidelink CSI-RS, and Sidelink PT-RS.

[0256] The sidelink synchronization signal is used by the terminal device 1 to synchronize the sidelink frequency domain and / or time domain. The sidelink synchronization signal is a collective term for the sidelink primary synchronization signal (S-PSS) and the sidelink secondary synchronization signal (S-SSS).

[0257] The sidelink DM RS is a general term for the DM RS for the PSBCH, the DM RS for the PSCCH, and the DM RS for the PSSCH. The time domain pattern of the DM RS for the PSSCH is selected by the transmitting terminal device 1. The time domain patterns of the selection candidates are configured for each resource pool.

[0258] The sidelink CSI-RS is a reference signal used for sidelink channel measurement. It includes a time resource allocation (symbol position to be allocated), a frequency resource allocation, the number of antenna ports, and the number of layers for the CSI-RS. The terminal device 1 reports channel state information measured based on the sidelink CSI-RS using MAC CE.

[0259] Sidelink PT-RS may be supported only in the high frequency band (FR2). The time and frequency density of sidelink PT-RS is configured for each resource pool.

[0260] A signal for AGC (Access Gain Control) may be used. The signal for AGC may be placed in the first OFDM symbol of a slot. The signal for AGC may be placed in an OFDM symbol other than the first OFDM symbol of a slot. The OFDM symbol in which the signal for AGC is placed may be configured for the terminal device 1 by the base station device 3. The OFDM symbol in which the signal for AGC is placed may be configured in advance.

[0261] The terminal device 1 may use the uplink PUCCH to report information about the sidelink HARA-ACK received from the destination terminal device 1 to the base station device 3. A semi-static HARQ-ACK codebook or a dynamic HARQ-ACK codebook may be used.

[0262] 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

[0263] 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 acquired by receiving PSFCH from the remote terminal device 1 using PUCCH. The PUCCH resource indicator indicates the PUCCH resource used to feed back HARQ-ACK information acquired 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 assigned by the base station device 3 to the terminal device 1 within a certain period.

[0264] Before transmitting a signal (channel access), the terminal device 1 senses the channel (carrier sense) to check whether other devices (e.g., a base station device, a terminal device, a WiFi terminal device, a WiFi access point, etc.) are transmitting. After transmitting the previous signal, the terminal device 1 randomly generates a backoff counter value within the range of the contention window size (CWS). The terminal device 1 waits until it confirms that the channel (LBT subband, RB set, for example, a band with a 20 MHz bandwidth) is idle, and performs carrier sense at each sensing slot time. If the channel is idle, the terminal device 1 sequentially decrements a counter value determined randomly within the contention window size (CWS), and after the counter value reaches 0, it obtains access to the channel and transmits a signal. After completing signal transmission, the terminal device 1, which communicates using HARQ-ACK feedback, updates the contention window size based on the HARQ-ACK feedback received from the terminal device 1 to which the signal is being transmitted. If the HARQ-ACK status is ACK, the terminal device 1 sets the contention window size to the minimum value. If the HARQ-ACK status is NACK, the terminal device 1 sets the contention window size to the next largest value. If the contention window size reaches the configurable maximum value, the terminal device 1 continues to use the maximum value even if the HARQ-ACK status is NACK. If the terminal device 1 has used the configurable maximum contention window size multiple times in succession, it may reset the contention window size to the configurable minimum value.

[0265] The terminal device 1 acquires a transmission opportunity (TxOP, Channel Occupancy) and performs transmission when the LBT result is idle, and does not perform transmission when the LBT result is busy (LBT-busy). The time of the transmission opportunity is called Channel Occupancy Time (COT). COT is the total time length between all transmissions within a transmission opportunity and gaps within a predetermined time, and may be less than or equal to a maximum COT (MCOT). MCOT may be determined based on a channel access priority class. The channel access priority class may be associated with a contention window size.

[0266] Channel access priority classes are defined and used. For example, four channel access priority classes (channel access priority class 1, channel access priority class 2, channel access priority class 3, and channel access priority class 4) are defined and used. In channel access priority class 1, the minimum contention window size is 3 slots, the maximum contention window size is 7 slots, and there are two allowed contention window sizes: {3 slots, 7 slots}. In channel access priority class 2, the minimum contention window size is 7 slots, the maximum contention window size is 15 slots, and there are two allowed contention window sizes: {7 slots, 15 slots}. In channel access priority class 3, the minimum contention window size is 15 slots, the maximum contention window size is 1023 slots, and there are seven allowed contention window sizes: {15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, 1023 slots}. In channel access priority class 4, the minimum contention window size is 15 slots, the maximum contention window size is 1023 slots, and there are seven permitted contention window sizes: {15 slots, 31 slots, 63 slots, 127 slots, 255 slots, 511 slots, 1023 slots}. Note that the contention window size may represent the number of counts per slot.

[0267] If the terminal device 1 determines that the channel is busy through carrier sensing during the sensing slot time, it senses whether the channel is idle in the defer interval. The defer interval consists of 16 us and multiple sensing slots. The number of sensing slots that make up the defer interval depends on the channel access priority class. In channel access priority class 1, about two sensing slots are configured in the defer interval. In channel access priority class 2, about two sensing slots are configured in the defer interval. In channel access priority class 3, about three sensing slots are configured in the defer interval. In channel access priority class 4, about seven sensing slots are configured in the defer interval. If the terminal device 1 determines that the channel is busy in the defer interval, it again determines whether the channel is idle in a new defer interval. If the terminal device 1 determines that the channel is idle in the defer interval, it decrements the counter value set based on the contention window size and continues to perform carrier sensing every sensing slot time to determine whether the channel is idle.

[0268] For example, for channel access priority class 1, a maximum COT of 2 ms is used. For example, for channel access priority class 2, a maximum COT of 3 ms is used. For example, for channel access priority class 2, a maximum COT of 4 ms is used. For example, for channel access priority class 3, a maximum COT of 6 ms is used. For example, for channel access priority class 3, a maximum COT of 8 ms is used. For example, for channel access priority class 3, a maximum COT of 10 ms is used. For example, for channel access priority class 4, a maximum COT of 6 ms is used. For example, for channel access priority class 4, a maximum COT of 8 ms is used. For example, for channel access priority class 4, a maximum COT of 10 ms is used.

[0269] 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 excludes resources recognized by SCIs transmitted by other terminal devices 1 from selection candidates. Resources indicated by SCIs transmitted by other terminal devices 1 are reserved and used by other terminal devices 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 selection candidates. The resource may be reserved and used by other terminal devices 1. The terminal device 1 finally selects one resource from the narrowed-down pool of resource candidates.

[0270] In sidelink resource allocation mode 2, the number of reserved resources is configured or pre-configured by RRC signaling. The second or third unit resource, other than the first unit resource, is the reserved resource on the time axis of a series of resources. The interval (in ms) between the first unit resource and the second unit resource, and the interval between the second unit resource and the third unit resource, are configured or pre-configured by RRC signaling. The interval between the reserved resources may be selected randomly.

[0271] To use unlicensed spectrum, certain restrictions must be met. For example, according to regulations of the European Telecommunications Standards Institute (ETSI), when using 5 GHz, one of the unlicensed spectrum bands, the occupied channel bandwidth (OCB), which contains 99% of the signal power, must be at least 80% of the available bandwidth (e.g., system bandwidth, LBT sub-band bandwidth, sub-band bandwidth). Also, restrictions are specified regarding the maximum power spectral density (PSD) per given bandwidth (1 MHz).

[0272] To satisfy such constraints (e.g., OCB rules), transmission (interlaced transmission) is performed on unlicensed carriers using a set of multiple frequency domain resources (also called interlaces, RB sets, etc.) at a predetermined interval. One interlace may be defined as a set of multiple frequency domain resources allocated at a predetermined frequency interval (e.g., 10 RB intervals).

[0273] 5 is a diagram showing an example of interlace mapping according to one aspect of this embodiment. Here, a case will be described in which the total available bandwidth is 20 MHz and there are 100 RBs (PRBs). Interlace #i is made up of 10 RBs with index values ​​{i, i+10, i+20, ..., i+90}. One interlace is made up of multiple RBs spaced at a frequency interval of 10 RBs. When the total available bandwidth is 20 MHz, 10 interlaces #0 to #9 are provided.

[0274] Although FIG. 5 illustrates a case where the subcarrier spacing is 15 kHz, the frequency spacing of the resource blocks constituting an interlace may be different when the subcarrier spacing is 30 kHz. A 20 MHz bandwidth is made up of 50 RBs, and one interlace is made up of 10 RBs. In this case, there are five interlaces, #0 to #4. In this case, interlace #i is made up of 10 RBs with index values ​​{i, i+5, i+10, ..., i+45}. One interlace is made up of multiple RBs with a frequency spacing of five RBs.

[0275] A subchannel may consist of one or more interlaces. Subchannel indexes and interlace indexes may be associated in ascending order.

[0276] For example, the interlace with index #0 (resource blocks with #0, #10, #20, #30, #40, #50, #60, #70, #80, and #90) is used as the common resource (common interlace) for the PSFCH. Resource blocks (PRBs) belonging to interlaces other than the interlace used for the common resource (dedicated PRB) are used as the dedicated resource for the PSFCH. For example, resource blocks of interlaces with indexes #1 to #9 are used. Resource blocks used for the dedicated resource for the PSFCH are set for each resource pool. A bitmap indicating the interlaces used for the dedicated resource for the PSFCH is notified to the terminal device 1.

[0277] The terminal device 1 transmits a signal generated from the HARQ-ACK information using one or more dedicated resource resource blocks (dedicated PRBs) that are implicitly or explicitly specified. For example, the terminal device 1 uses two dedicated PRBs with small indices in the same interlace as dedicated resources, maps the signal generated from the HARQ-ACK information to the dedicated resources, and transmits the signal. When transmitting a signal using dedicated resources, the terminal device 1 also transmits the signal using common resources.

[0278] 6 is a diagram showing an example of a case where a time domain for the PSFCH is preset in a part of the COT according to one aspect of the present embodiment. Here, a case will be described where the COT corresponds to six consecutive slots (slot #0, slot #1, slot #2, slot #3, slot #4, slot #5). The terminal device 1 transmits a signal within the resources of the six consecutive slots. As a result of the LBT, the terminal device 1 determines that the channel is idle and starts the COT from slot #0. The terminal device 1 transmits the PSCCH / PSSCH in slot #0. The terminal device 1 transmits the PSCCH / PSSCH in slot #1. The terminal device 1 transmits the PSCCH / PSSCH in slot #2. The terminal device 1 transmits the PSCCH / PSSCH in slot #3. In slot #4, a time domain for the PSFCH is preset. In slot #4, terminal device 1 transmits PSCCH / PSSCH in a portion of a symbol in which a time domain for PSFCH is not set, and receives PSFCH (transmitted by another terminal device 1) in a symbol in which a time domain for PSFCH is set. A time gap for switching between transmission and reception is set between the symbol in which a time domain for PSFCH is set in advance and the other symbols. Terminal device 1 transmits PSCCH / PSSCH in slot #5.

[0279] Although the case where the PSCCH is transmitted in slot #1, slot #2, slot #3, etc. has been described here, the PSCCH may be transmitted only in slot #0, which is the first slot of consecutive slots, and the PSCCH may not be transmitted in slot #1, slot #2, or slot #3. Although the case where the time domain for the PSFCH is set in the latter half of the slot has been described, the time domain for the PSFCH may also be set in the first half of the slot.

[0280] FIG. 7 is a diagram showing an example of a case where multiple PSFCH occasions are configured for one PSCCH / PSSCH according to one aspect of the present embodiment. Here, a case where four PSFCH occasions (PSFCH occasion #0, PSFCH occasion #1, PSFCH occasion #2, and PSFCH occasion #3) are configured for one PSCCH / PSSCH is shown. Here, a case where a PSFCH occasion is configured for every four slots is shown. In FIG. 7, PSFCH occasions are configured for slot #3, slot #7, slot #11, slot #15, and slot #19. Here, it is only shown that PSFCH occasions are configured for slot #3, slot #7, slot #11, slot #15, and slot #19, but it is not shown that a PSFCH occasion is configured in the time domain at the center of a slot. For simplicity of explanation, the minimum time gap between the PSSCH and the PSFCH is assumed to be two slots. For convenience of explanation, the terms PSCCH, PSSCH, PSBCH, S-SSB, RS, etc. are omitted.

[0281] For the PSCCH / PSSCH in slot #0, the first corresponding PSFCH occasion is PSFCH occasion #0 in slot #3, which is the slot in which the PSFCH occasion after a gap of two slots is configured, the second corresponding PSFCH occasion is PSFCH occasion #1 in slot #7, which is the slot in which the next PSFCH occasion is configured, the third corresponding PSFCH occasion is PSFCH occasion #2 in slot #11, which is the slot in which the next PSFCH occasion is configured, and the fourth corresponding PSFCH occasion is PSFCH occasion #3 in slot #15, which is the slot in which the next PSFCH occasion is configured. For the PSCCH / PSSCH in slot #1, the first corresponding PSFCH occasion is PSFCH occasion #0 in slot #7, which is the slot in which the PSFCH occasion after a gap of two slots is configured, the second corresponding PSFCH occasion is PSFCH occasion #1 in slot #11, which is the slot in which the next PSFCH occasion is configured, the third corresponding PSFCH occasion is PSFCH occasion #2 in slot #15, which is the slot in which the next PSFCH occasion is configured, and the fourth corresponding PSFCH occasion is PSFCH occasion #3 in slot #19, which is the slot in which the next PSFCH occasion is configured.For the PSCCH / PSSCH in slot #2, the first corresponding PSFCH occasion is PSFCH occasion #0 in slot #7, which is the slot in which the PSFCH occasion after a gap of two slots is configured, the second corresponding PSFCH occasion is PSFCH occasion #1 in slot #11, which is the slot in which the next PSFCH occasion is configured, the third corresponding PSFCH occasion is PSFCH occasion #2 in slot #15, which is the slot in which the next PSFCH occasion is configured, and the fourth corresponding PSFCH occasion is PSFCH occasion #3 in slot #19, which is the slot in which the next PSFCH occasion is configured. For the PSCCH / PSSCH in slot #3, the first corresponding PSFCH occasion is PSFCH occasion #0 in slot #7, which is the slot in which the PSFCH occasion after a gap of two slots is configured, the second corresponding PSFCH occasion is PSFCH occasion #1 in slot #11, which is the slot in which the next PSFCH occasion is configured, the third corresponding PSFCH occasion is PSFCH occasion #2 in slot #15, which is the slot in which the next PSFCH occasion is configured, and the fourth corresponding PSFCH occasion is PSFCH occasion #3 in slot #19, which is the slot in which the next PSFCH occasion is configured.

[0282] The terminal device 1 transmits a PSFCH including a HARQ-ACK at a PSFCH occasion where the LBT is successful. The terminal device 1 receives a PSFCH including a HARQ-ACK at each PSFCH occasion. The terminal device 1 may attempt to receive a PSFCH only at a PSFCH occasion corresponding to the transmitted PSCCH / PSSCH. When the terminal device 1 transmits a PSFCH for a certain PSCCH / PSSCH at a certain PSFCH occasion, it does not need to transmit a PSFCH at a subsequent PSFCH occasion corresponding to the same PSCCH / PSSCH. By configuring multiple PSFCH occasions for one PSCCH / PSSCH and increasing the opportunities for transmitting a PSFCH, recovery from an LBT failure can be realized.

[0283] Information indicating a set of dedicated PRBs for each of a plurality of PSFCH occasions corresponding to one PSCCH / PSSCH may be exchanged between the base station device 3 and the terminal device 1. In the example of Fig. 7 , information indicating a set of dedicated PRBs for PSFCH occasion #0, information indicating a set of dedicated PRBs for PSFCH occasion #1, information indicating a set of dedicated PRBs for PSFCH occasion #2, and information indicating a set of dedicated PRBs for PSFCH occasion #3 may be exchanged between the base station device 3 and the terminal device 1.

[0284] The information indicating the set of dedicated PRBs for PSFCH occasion #0 may independently include information indicating the symbols on which the dedicated PRBs are configured, information indicating the set of dedicated PRBs for PSFCH occasion #1 may independently include information indicating the symbols on which the dedicated PRBs are configured, information indicating the set of dedicated PRBs for PSFCH occasion #2 may independently include information indicating the symbols on which the dedicated PRBs are configured, and information indicating the set of dedicated PRBs for PSFCH occasion #3 may independently include information indicating the symbols on which the dedicated PRBs are configured.

[0285] Information indicating a set of dedicated PRBs for a group of multiple PSFCH occasions corresponding to one PSCCH / PSSCH may be exchanged between the base station device 3 and the terminal device 1. In the example of Fig. 7 , in the set of dedicated PRBs indicated by the information, the terminal device 1 may determine that a certain number of dedicated PRBs starting from the smallest numbered individual PRBs are a set of dedicated PRBs for PSFCH occasion #0, determine that a certain number of dedicated PRBs starting from the next successive numbered individual PRBs are a set of dedicated PRBs for PSFCH occasion #1, determine that a certain number of dedicated PRBs starting from the next successive numbered individual PRBs are a set of dedicated PRBs for PSFCH occasion #2, and determine that a certain number of dedicated PRBs starting from the next successive numbered individual PRBs are a set of dedicated PRBs for PSFCH occasion #3. For example, terminal device 1 may receive information indicating a set of 40 individual PRBs from base station device 3, and may determine that a certain set of 10 individual PRBs is set for PSFCH occasion #0, a different set of 10 individual PRBs is set for PSFCH occasion #1, a different set of 10 individual PRBs is set for PSFCH occasion #2, and a different set of 10 individual PRBs is set for PSFCH occasion #3.

[0286] The terminal device 1 determines the resources to be set for a PSFCH occasion based on information about the numbered resources (individual PRBs) starting from the resource block with the smallest index in the interlace with the smallest index among multiple interlaces in ascending order, then sequentially numbering the resource blocks with the next index in the same interlace, numbering the resource block with the largest index in the same interlace, and then numbering the resource block with the smallest index in the interlace with the next index in ascending order in the same manner, up to the resource block with the largest index in the interlace with the largest index.

[0287] The terminal device 1 performing numbering includes interpreting, determining, and understanding the numbering.

[0288] The terminal device 1 determining the configuration of resource blocks used in a PSFCH occasion includes understanding which physical resources each individual PRB number used in a PSFCH occasion is configured from.

[0289] The terminal device 1 transmits one or more PSFCHs having a high priority (small priority field value) among multiple PSFCHs in one PSFCH occasion. The priority of the PSFCH is determined based on SCI format 1-A. SCI format 1-A includes a field indicating the priority. The priority of the PSFCH is also determined based on the number of times the PSFCH was not transmitted in the PSFCH occasion. The number of times the PSFCH was not transmitted due to an LBT failure is not included, and the priority of the PSFCH may be determined based on the number of times the PSFCH was not transmitted because the LBT was successful but there was another PSFCH with a higher priority. The priority is adjusted based on the number of times the PSFCH was not transmitted with respect to the priority indicated in SCI format 1-A and determined. The terminal device 1 increases the priority indicated in SCI format 1-A by the number of times the PSFCH was not transmitted.

[0290] For example, if "4" is indicated as the priority field value in SCI format 1-A and the number of times the PSFCH was not transmitted in a PSFCH occasion is one, the priority is increased by one from the priority "4" based on SCI format 1-A and the priority is determined to be "3." For example, if "4" is indicated as the priority field value in SCI format 1-A and the number of times the PSFCH was not transmitted in a PSFCH occasion is two, the priority is increased by two from the priority "4" based on SCI format 1-A and the priority is determined to be "2."

[0291] The priority may be increased each time the PSFCH is not transmitted multiple times. For example, the priority may be increased by one every time the PSFCH is not transmitted twice. If the PSFCH is not transmitted once, the priority is not adjusted relative to the priority based on SCI format 1-A. If the PSFCH is not transmitted twice, the priority is increased by one relative to the priority based on SCI format 1-A. If the PSFCH is not transmitted three times, the priority is increased by one relative to the priority based on SCI format 1-A. If the PSFCH is not transmitted four times, the priority is increased by two relative to the priority based on SCI format 1-A.

[0292] As shown in FIG. 7 , a case will be described in which four PSFCH occasions (PSFCH occasion #0, PSFCH occasion #1, PSFCH occasion #2, PSFCH occasion #3) are configured for one PSCCH / PSSCH. Assume that "4" is indicated as the priority field value for a certain PSFCH (referred to as PSFCH #A) in SCI format 1-A. The terminal device 1 increases the priority by one based on the number of times the PSFCH has not been transmitted. The terminal device 1 determines that the priority of PSFCH #A is "4" in PSFCH occasion #0 and determines to transmit PSFCH #A. The terminal device 1 determines that the other PSFCHs have a higher priority and determines not to transmit PSFCH #A. The terminal device 1 determines that the priority of PSFCH #A is "3" in PSFCH occasion #1 (raising the priority by the number of times the PSFCH has not been transmitted compared to the priority based on SCI format 1-A) and determines to transmit PSFCH #A. The terminal device 1 determines that the other PSFCH has a higher priority, and determines not to transmit PSFCH #A. The terminal device 1 determines that the priority of PSFCH #A is "2" in PSFCH occasion #2 (raising the priority by the number of times the PSFCH has not been transmitted compared to the priority based on SCI format 1-A), and determines to transmit PSFCH #A. The terminal device 1 determines that the other PSFCH has a higher priority, and determines not to transmit PSFCH #A. The terminal device 1 determines that the priority of PSFCH #A is "1" in PSFCH occasion #3 (raising the priority by the number of times the PSFCH has not been transmitted compared to the priority based on SCI format 1-A), and determines to transmit PSFCH #A. The terminal device 1 determines that PSFCH #A has a higher priority than the other PSFCHs, and determines to transmit PSFCH #A.

[0293] FIG. 8 is a diagram showing a process of determining a priority for PSFCH transmission according to one aspect of the present embodiment. Here, a case will be described in which the terminal device 1 sets the priority higher by one each time the PSFCH cannot be transmitted. The terminal device 1 determines (sets) the priority for a certain PSFCH based on SCI format 1-A (step S201). The terminal device 1 determines that the value indicated in the field indicating priority included in SCI format 1-A is the priority for a certain PSFCH. The terminal device 1 determines whether the PSFCH can be transmitted in a PSFCH occasion (step S202). The terminal device 1 determines whether the PSFCH can be transmitted based on the priority for the PSFCH. The terminal device 1 determines that a PSFCH with a higher priority (smaller priority value) among multiple PSFCHs can be transmitted, and determines that a PSFCH with a lower priority (larger priority value) among multiple PSFCHs cannot be transmitted. When the terminal device 1 determines that the PSFCH can be transmitted in the PSFCH occasion (step S202: YES), it transmits the PSFCH (step S203). When the terminal device 1 determines that the PSFCH cannot be transmitted in the PSFCH occasion (step S202: NO), it determines whether there is another PSFCH occasion corresponding to the PSFCH (step S204). When the terminal device 1 determines that there is another PSFCH occasion corresponding to the PSFCH (step S204: YES), it increases (sets) the priority for the PSFCH by one (determines that the priority is one higher) (step S205). After setting the priority higher by one, the terminal device 1 again determines whether the PSFCH can be transmitted in the next PSFCH occasion (step S202). When the terminal device 1 determines that there is no other PSFCH occasion corresponding to the PSFCH (step S204: NO), it terminates the processing. After transmitting the PSFCH, the terminal device 1 terminates the processing.

[0294] The terminal device 1 determines the priority corresponding to the PSFCH based on the SCI format (e.g., SCI format 1-A) (e.g., the terminal device 1 determines that the priority value is "4"), and determines whether or not to transmit the PSFCH based on the determined priority in a first PSFCH occasion (e.g., PSFCH occasion #0 shown in FIG. 7). If it is determined that the PSFCH cannot be transmitted in the first PSFCH occasion, the terminal device 1 adjusts the determined priority higher (e.g., the terminal device 1 increases the priority value by one), and determines whether or not to transmit the PSFCH in a second PSFCH occasion (e.g., PSFCH occasion #1 shown in FIG. 7) based on the adjusted priority (e.g., a priority of "3" increased by one from "4"). The first PSFCH occasion (for example, PSFCH occasion #0 shown in FIG. 7) and the second PSFCH occasion (for example, PSFCH occasion #1 shown in FIG. 7) are PSFCH occasions configured for transmitting HQRA-ACK of the same PSSCH. Whether or not to transmit the PSFCH is determined when multiple PSFCH transmissions occur simultaneously when LBT is successful.

[0295] As described above, in the embodiment of the present invention, a higher priority is set for a PSFCH based on the fact that the PSFCH has not been transmitted, so that the PSFCH that has not been transmitted can be transmitted preferentially when multiple PSFCHs occur simultaneously. This makes it easier to complete the transmission of the PSFCH within multiple PSFCH occasions corresponding to one PSFCH, and supports efficient transmission and reception of the PSFCH.

[0296] The programs running on the base station device 3 and terminal device 1 according 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 according to one aspect of the present invention. Information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) or HDD (Hard Disk Drive), and is read, modified, and written by the CPU as needed.

[0297] Note that the terminal device 1 and part of the base station device 3 in the above-described embodiment may be realized by a computer. In this case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the control function.

[0298] The term "computer system" used here refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as an OS and peripheral devices. Also, the term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into the computer system.

[0299] Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or a medium that stores a program for a certain period of time, such as a volatile memory within a computer system that serves as a server or client in such a case. The program may also be one that realizes part of the above-mentioned functions, or one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0300] The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) 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 comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the base station device 3 to perform the operations and processes described in the above embodiments using the processor.

[0301] Furthermore, the base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as a collection.

[0302] Furthermore, the base station device 3 in the above-described embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). Furthermore, the base station device 3 in the above-described embodiment may have some or all of the functions of an upper node for the eNodeB and / or the gNB.

[0303] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiments may be realized as an LSI, which is typically an integrated circuit, or as a chipset. Each functional block of the terminal device 1 and base station device 3 may be individually formed into a chip, or some or all of them may be integrated into a chip. Furthermore, the integrated circuit method is not limited to LSI, and may be realized using a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

[0304] Furthermore, in the above-described 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, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0305] 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 are also included within the scope of the gist of the present invention. 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. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included.

[0306] 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.

[0307] 1 (1A, 1B, 1C) Terminal device 3 (3A, 3B, 3C) Base station device 10, 30 Radio transmission / reception unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device having a processor and a memory for storing computer program code, the terminal device executing operations including: determining a priority corresponding to a PSFCH based on an SCI format; determining whether or not to transmit the PSFCH based on the determined priority in a first PSFCH occasion; adjusting the determined priority higher when it is determined that the PSFCH cannot be transmitted in the first PSFCH occasion; and determining whether or not to transmit the PSFCH based on the adjusted priority in a second PSFCH occasion.

2. The terminal device according to claim 1, wherein the first PSFCH occasion and the second PSFCH occasion are PSFCH occasions configured for transmitting an HQRA-ACK of the same PSSCH.

3. The terminal device according to claim 1, wherein the possibility of transmitting the PSFCH is determined when multiple PSFCH transmissions occur simultaneously when the LBT is successful.

4. A communication method used in a terminal device, comprising: a step of determining a priority corresponding to a PSFCH based on an SCI format; a step of determining whether or not to transmit the PSFCH based on the determined priority in a first PSFCH occasion; a step of adjusting the determined priority higher if it is determined that the PSFCH cannot be transmitted in the first PSFCH occasion; and a step of determining whether or not to transmit the PSFCH based on the adjusted priority in a second PSFCH occasion.

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